The imaging lens includes at least one negative lens that satisfies predetermined Conditional Expressions (1) to (3) indicating conditions in which dispersion is relatively low and refractive index is high while having a negative rate of change of the refractive index. A positive lens having a largest Abbe number at the d line among positive lenses included in the imaging lens satisfies predetermined Conditional Expressions (4) and (5).

Description

12 parts

›CROSS REFERENCE TO RELATED APPLICATIONS

The present application claims priority under 35 U.S.C. § 119 to Japanese Patent Application No. 2017-183862 filed on Sep. 25, 2017. The above application is hereby expressly incorporated by reference, in its entirety, into the present application.

›BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an imaging lens suitable for a digital camera, a projector or the like, and an optical apparatus including this imaging lens.

2. Description of the Related Art

As imaging lenses suitable for an optical apparatus such as a digital camera or a projector, imaging lenses disclosed in, for example, JP2003-222793A or JP2008-46259A have been known.

›SUMMARY OF THE INVENTION · 1 of 2

It is important to suppress chromatic aberration in order to realize a high-definition imaging lens, and a material having large abnormal dispersibility is effective in correcting a secondary spectrum of chromatic aberration. There is a problem in that a material having large abnormal dispersibility has a large change in refractive index with respect to a change in temperature, and that the use of this material in a positive lens causes a focus position to extend during a rise in temperature.

Lens systems disclosed in JP2003-222793A and JP2008-46259A all correct defocusing caused in a positive lens having large abnormal dispersibility by combining a negative lens having large abnormal dispersibility likewise. Such a method is a measure effective in the correction of defocusing with a change in temperature and the correction of chromatic aberration, but there is a problem in that, since a material having a low refractive index has to be used in a negative lens for the purpose of temperature correction, the correction of field curvature is not sufficiently performed.

The present invention has been contrived in view of such circumstances, and an object thereof is to provide an imaging lens in which various aberrations such as chromatic aberration and field curvature are satisfactorily corrected while satisfactorily correcting defocusing due to a change in temperature, and an optical apparatus including this imaging lens.

According to the present invention, there is provided an imaging lens in which a plurality of lenses are combined with each other, comprising at least one negative lens that satisfies the following Conditional Expressions (1) to (3) in a case where a refractive index at a d line of a negative lens included in the imaging lens is set to nN, an Abbe number at the d line of the negative lens is set to νN, and a rate of change of the refractive index at the d line of the negative lens with respect to a change in temperature at 25° C. is set to dnN/dt, wherein a positive lens having a largest Abbe number at the d line among positive lenses included in the imaging lens satisfies the following Conditional Expressions (4) and (5) in a case where an Abbe number at the d line of the positive lens having a largest Abbe number at the d line is set to νP1, and a partial dispersion ratio of the positive lens having a largest Abbe number at the d line is set to θP1gF.

1.65< nN< 1.75 (1)

45<ν N< 55 (2)

dnN/dt< 0×10 −6 /° C. (3)

63<ν P 1 (4)

0.644<θ P 1 gF+ 0.001618×ν P 1 (5)

Meanwhile, it is preferable that the negative lens that satisfies Conditional Expressions (1) to (3) satisfies at least one of Conditional Expressions (1-1), (2-1), and (3-1).

1.69< nN< 1.71 (1-1)

50<ν N< 52 (2-1)

−2×10 −6 /° C.< dnN/dt<− 1×10 −6 /° C. (3-1)

In addition, it is preferable that the positive lens having a largest Abbe number at the d line among positive lenses included in the imaging lens satisfies at least one of Conditional Expressions (4-1) and (5-1).

75<ν P 1<100 (4-1)

0.665<θ P 1 gF+ 0.001618×ν P 1<0.7 (5-1)

In the imaging lens of the present invention, in a case where a focal length of the negative lens is set to fN, and a focal length of the whole system during focusing on an infinite object is set to f, at least one negative lens among negative lenses that satisfy Conditional Expressions (1) to (3) preferably satisfies the following Conditional Expression (6), and more preferably satisfies the following Conditional Expression (6-1). Meanwhile, in a case where the imaging lens is provided with a zooming function, it is preferable to satisfy the following Conditional Expression (6) and/or (6-1) in one place within a zooming region. In addition, in a case where negative lenses are cemented, it is assumed that the front and back of the negative lenses are calculated as air.

| fN|/f< 10 (6)

0.5<| fN|/f< 5 (6-1)

In addition, it is preferable to include at least one positive lens that satisfies the following Conditional Expressions (7) to (9) in a case where a refractive index at the d line of a positive lens included in the imaging lens is set to nP2, an Abbe number at the d line of the positive lens is set to νP2, and a rate of change of the refractive index at the d line of the positive lens with respect to a change in temperature at 25° C. is set to dnP2/dt.

1.6< nP 2<1.85 (7)

40<ν P 2<60 (8)

6×10 −6 /° C.< dnP 2/ dt (9)

Here, it is preferable that the positive lens that satisfies Conditional Expressions (7) to (9) further satisfies at least one of Conditional Expressions (7-1), (8-1), and (9-1).

1.65< nP 2<1.8 (7-1)

42<ν P 2<57 (8-1)

6.5×10 −6 /° C.< dnP 2/ dt< 11×10 −6 /° C. (9-1)

In addition, in a case where a focal length of the positive lens is set to fP2, and a focal length of the whole system during focusing on an infinite object is set to f, the positive lens that satisfies Conditional Expressions (7) to (9) preferably satisfies the following Conditional Expression (10), and more preferably satisfy the following Conditional Expression (10-1). Meanwhile, in a case where the imaging lens is provided with a zooming function, it is preferable to satisfy the following Conditional Expression (10) and/or (10-1) in one place within a zooming region. In addition, in a case where positive lenses are cemented, it is assumed that the front and back of the positive lenses are calculated as air.

fP 2/ f< 15 (10)

0.2< fP 2/ f< 5 (10-1)

0.3<| HN/H max| (11)

0.49−| HN/H max|<1 (11-1)

›SUMMARY OF THE INVENTION · 2 of 2

|( HNt/Htwm )/( HNw/Hwwm )|<1.8 (12)

0.4<|( HNt/Htwm )/( HNw/Hwwm )|<1.5 (12-1)

In addition, the imaging lens may have a zooming function. In that case, particularly, in a case where defocusing with a change in temperature at the telephoto end is corrected, it is preferable to satisfy the following Conditional Expression (13), and more preferable to satisfy the following Conditional Expression (13-1) in a case where a height of a paraxial on-axis light ray at a telephoto end on an object-side surface of the negative lens that satisfies Conditional Expressions (1) to (3) is set to HNt, a height of a paraxial on-axis light ray at the telephoto end of a surface having a maximum height of a paraxial on-axis light ray at a wide-angle end on each lens surface of all lenses included in the imaging lens is set to Htwm, a height of a paraxial on-axis light ray at the wide-angle end on the object-side surface of the negative lens that satisfies Conditional Expressions (1) to (3) is set to HNw, and a maximum value of heights of a paraxial on-axis light ray at the wide-angle end on each lens surface of all lenses included in the imaging lens is set to Hwwm.

1.8<|( HNt/Htwm )/( HNw/Hwwm )| (13)

2<|( HNt/Htwm )/( HNw/Hwwm )|<50 (13-1)

According to the present invention, there is provided an optical apparatus comprising the above-described imaging lens of the present invention.

Meanwhile, the term “consist of ˜” is intended to be allowed to include a lens having substantially no refractive power, optical elements, other than a lens, such as a stop, a mask, cover glass, or a filter, mechanism portions such as a lens flange, a lens barrel, an imaging element, or a camera-shake correction mechanism, and the like, in addition to the things enumerated as elements.

In addition, the surface shape, the sign of the refractive power, and the curvature radius of the lens are assumed to be those in a paraxial region in a case where an aspherical surface is included.

In addition, the partial dispersion ratio θgF is represented by the following expression in a case where a refractive index at a g line (a wavelength of 435.8 nm) is set to ng, a refractive index at an F line (a wavelength of 486.1 nm) is set to nF, and a refractive index at a C line (a wavelength of 656.3 nm) is set to nC.

θ gF =( ng−nF )/( nF−nC )

In addition, the height of a paraxial on-axis light ray is based on a definition in paraxial light ray tracing according to Expressions (2.10) to (2.12), pp. 19 of “Optical Technology Series 1 Lens Design Method” (authored by Yoshiya Matsui, Kyoritsu Shuppan Co., Ltd.).

According to the present invention, there is provided an imaging lens in which a plurality of lenses are combined with each other, including at least one negative lens that satisfies the following Conditional Expressions (1) to (3) in a case where a refractive index at a d line of a negative lens included in the imaging lens is set to nN, an Abbe number at the d line of the negative lens is set to νN, and a rate of change of the refractive index at the d line of the negative lens with respect to a change in temperature at 25° C. is set to dnN/dt, wherein a positive lens having a largest Abbe number at the d line among positive lenses included in the imaging lens satisfies the following Conditional Expressions (4) and (5) in a case where an Abbe number at the d line of the positive lens having a largest Abbe number at the d line is set to νP1, and a partial dispersion ratio of the positive lens having a largest Abbe number at the d line is set to θP1gF. Therefore, it is possible to provide an imaging lens in which various aberrations such as chromatic aberration and field curvature are satisfactorily corrected while satisfactorily correcting defocusing due to a change in temperature, and an optical apparatus including this imaging lens.

1.65< nN< 1.75 (1)

45<ν N< 55 (2)

dnN/dt< 0×10 −6 /° C. (3)

63<ν P 1 (4)

0.644<θ P 1 gF+ 0.001618×ν P 1 (5)

›BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional view illustrating a lens configuration of an imaging lens (in common with that of Example 1) according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a lens configuration of an imaging lens of Example 2 of the present invention.

FIG. 3 is a cross-sectional view illustrating a lens configuration of an imaging lens of Example 3 of the present invention.

FIG. 4 is a cross-sectional view illustrating a lens configuration of an imaging lens of Example 4 of the present invention.

FIG. 5 is a cross-sectional view illustrating a lens configuration of an imaging lens of Example 5 of the present invention.

FIG. 6 is a cross-sectional view illustrating a lens configuration of an imaging lens of Example 6 of the present invention.

FIG. 7 is a cross-sectional view illustrating a lens configuration of an imaging lens of Example 7 of the present invention.

FIG. 8 is a diagram of aberrations of the imaging lens of Example 1 of the present invention.

FIG. 9 is a diagram of aberrations of the imaging lens of Example 2 of the present invention.

FIG. 10 is a diagram of aberrations of the imaging lens of Example 3 of the present invention.

FIG. 11 is a diagram of aberrations of the imaging lens of Example 4 of the present invention.

FIG. 12 is a diagram of aberrations of the imaging lens of Example 5 of the present invention.

FIG. 13 is a diagram of aberrations of the imaging lens of Example 6 of the present invention.

FIG. 14 is a diagram of aberrations of the imaging lens of Example 7 of the present invention.

FIG. 15 is a schematic configuration diagram of an optical apparatus according to an embodiment of the present invention.

FIG. 16 is a perspective view illustrating a front side of an optical apparatus according to another embodiment of the present invention.

FIG. 17 is a perspective view illustrating a rear surface side of the optical apparatus of FIG. 16 .

›DESCRIPTION OF THE PREFERRED EMBODIMENTS · 1 of 6

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view illustrating a lens configuration of an imaging lens according to an embodiment of the present invention. The configuration example shown in FIG. 1 is in common with the configuration of an imaging lens of Example 1 described later. In FIG. 1 , the left side is an object side, the right side is an image side, and a shown aperture stop St shows its position on the optical axis Z without necessarily indicating its size or shape. In addition, FIG. 1 shows a state of being focused on the infinite object, and shows an on-axis light flux a and a light flux b of the maximum angle of view together.

Meanwhile, in a case where the imaging lens is mounted in an optical apparatus, it is preferable to include various types of filters and/or protective cover glass according to the specification of the optical apparatus. Thus, in FIG. 1 , an example is shown in which a plane parallel plate-like optical member PP oriented to these components is disposed between a lens system and an image surface Sim. However, the position of the optical member PP is not limited to that shown in FIG. 1 , and a configuration can also be used in which the optical member PP is omitted.

According to the present embodiment, there is provided an imaging lens in which a plurality of lenses are combined with each other, including at least one negative lens that satisfies the following Conditional Expressions (1) to (3) in a case where a refractive index at a d line of a negative lens included in the imaging lens is set to nN, an Abbe number at the d line of the negative lens is set to νN, and a rate of change of the refractive index at the d line of the negative lens with respect to a change in temperature at 25° C. is set to dnN/dt, wherein a positive lens having a largest Abbe number at the d line among positive lenses included in the imaging lens satisfies the following Conditional Expressions (4) and (5) in a case where an Abbe number at the d line of the positive lens having a largest Abbe number at the d line is set to νP1, and a partial dispersion ratio of the positive lens having a largest Abbe number at the d line is set to θP1gF.

1.65< nN< 1.75 (1)

45<ν N< 55 (2)

dnN/dt< 0×10 −6 /° C. (3)

63<ν P 1 (4)

0.644<θ P 1 gF+ 0.001618×ν P 1 (5)

Conditional Expressions (1) to (3) are conditions for satisfactorily correcting defocusing with a change in temperature even in a case where a material having large abnormal dispersibility is used in a positive lens. The negative lens that satisfies Conditional Expressions (1) to (3) refers to a negative lens in which dispersion is relatively low and refractive index is high while having a negative rate of change of the refractive index, and can correct a direction in which a focus position during a rise in temperature is shortened. Since a lot of optical materials have a positive rate of change of the refractive index, the negative lens that satisfies Conditional Expressions (1) to (3) and a lens formed of other general optical materials are combined with each other, and thus it is possible to satisfactorily correct chromatic aberration and defocusing due to a change in temperature.

In addition, a positive lens having a largest Abbe number at the d line among positive lenses included in the imaging lens is made to satisfy Conditional Expressions (4) and (5), and thus it is possible to make a design in which chromatic aberration is suppressed. Further, it is possible to correct defocusing with a change in temperature while suppressing field curvature and chromatic aberration by combination with the negative lens that satisfies Conditional Expressions (1) to (3).

The value (nN) is not set to be equal to or less than the lower limit of Conditional Expression (1), and thus it is possible to prevent the refractive index from excessively decreasing, which leads to the advantage of the correction of field curvature. The value (nN) is not set to be equal to or greater than the upper limit of Conditional Expression (1), and thus it is possible to prevent the refractive index from excessively increasing, and to secure an Abbe number required for chromatic aberration correction. Meanwhile, in a case where Conditional Expression (1-1) is satisfied, it is possible to make characteristics more satisfactory.

1.69< nN< 1.71 (1-1)

The value (νN) is not set to be equal to or less than the lower limit of Conditional Expression (2), which leads to the advantage of the correction of lateral chromatic aberration and on-axis chromatic aberration. The value (νN) is not set to be equal to or greater than the upper limit of Conditional Expression (2), which leads to the advantage of both the chromatic aberration correction and the refractive index. Meanwhile, in a case where Conditional Expression (2-1) is satisfied, it is possible to make characteristics more satisfactory.

50<ν N< 52 (2-1)

The value (dnN/dt) is not set to be equal to or less than the lower limit of Conditional Expression (3), and thus it is possible to prevent a change in refractive index with respect to a change in temperature from excessively increasing, and to prevent the correction of defocusing from being in excess. The value (dnN/dt) is not set to be equal to or greater than the upper limit of Conditional Expression (3), and thus it is possible to prevent a change in refractive index with respect to a change in temperature from excessively decreasing, and to prevent the correction of defocusing from being in deficiency. Meanwhile, in a case where Conditional Expression (3-1) is satisfied, it is possible to make characteristics more satisfactory.

−2×10 −6 /° C.< dnN/dt<− 1×10 −6 /° C. (3-1)

The value (νP1) is not set to be equal to or less than the lower limit of Conditional Expression (4), which leads to the advantage of the correction of lateral chromatic aberration. The value (νP1) is not set to be equal to or greater than the upper limit of Conditional Expression (4), and thus it is possible to prevent the refractive index from excessively decreasing, which leads to the advantage of the correction of spherical aberration. Meanwhile, in a case where Conditional Expression (4-1) is satisfied, it is possible to make characteristics more satisfactory.

›DESCRIPTION OF THE PREFERRED EMBODIMENTS · 2 of 6

75<ν P 1<100 (4-1)

The value (θP1gF+0.001618×νP1) is not set to be equal to or less than the lower limit of Conditional Expression (5), and thus it is possible to prevent abnormal dispersibility from excessively decreasing, which leads to the facilitation of the correction of a secondary spectrum. The value (θP1gF+0.001618×νP1) is not set to be equal to or greater than the upper limit of Conditional Expression (5), and thus it is possible to prevent the refractive index from excessively decreasing, which leads to the advantage of the correction of spherical aberration. Meanwhile, in a case where Conditional Expression (5-1) is satisfied, it is possible to make characteristics more satisfactory.

0.665<θ P 1 gF+ 0.001618×ν P 1<0.7 (5-1)

In the imaging lens of the present embodiment, it is preferable that at least one negative lens among negative lenses that satisfy Conditional Expressions (1) to (3) satisfies the following Conditional Expression (6) in a case where a focal length of the negative lens is set to fN, and a focal length of the whole system during focusing on an infinite object is set to f. The value (|fN|/f) is not set to be equal to or greater than the upper limit of Conditional Expression (6), and thus it is possible to prevent the refractive power of the negative lens that satisfies Conditional Expressions (1) to (3) from becoming excessively weak, and to prevent a temperature correction effect from excessively decreasing. Meanwhile, in a case where Conditional Expression (6-1) is satisfied, it is possible to make characteristics more satisfactory. The value (|fN|/f) is not set to be equal to or less than the lower limit of Conditional Expression (6), and thus it is possible to prevent the refractive power of the negative lens that satisfies Conditional Expressions (1) to (3) from becoming excessively strong, and to prevent the temperature correction effect from excessively increasing.

| fN|/f< 10 (6)

0.5<| fN|/f< 5 (6-1)

1.6< nP 2<1.85 (7)

40<ν P 2<60 (8)

6×10 −6 /° C.< dnP 2/ dt (9)

Conditional Expressions (7) to (9) are conditions for enabling a lens system to suppress chromatic aberration and spherical aberration while correcting a change in focus with respect to a change in temperature. It is possible to correct a direction in which a focus position during a rise in temperature is shortened by disposing the positive lens that satisfies Conditional Expressions (7) to (9), that is, a lens formed of a material having a large value with a positive change in refractive index with respect to a change in temperature.

The value (nP2) is not set to be equal to or less than the lower limit of Conditional Expression (7), and thus it is possible to prevent the refractive index from excessively decreasing, which leads to the advantage of the correction of spherical aberration. The value (nP2) is not set to be equal to or greater than the upper limit of Conditional Expression (7), and thus it is possible to prevent the refractive index from excessively increasing, and to secure an Abbe number required for chromatic aberration correction. Meanwhile, in a case where Conditional Expression (7-1) is satisfied, it is possible to make characteristics more satisfactory.

1.65< nP 2<1.8 (7-1)

The value (νP2) is not set to be equal to or less than the lower limit of Conditional Expression (8), which leads to the advantage of the correction of lateral chromatic aberration and on-axis chromatic aberration. The value (νP2) is not set to be equal to or greater than the upper limit of Conditional Expression (8), which leads to the advantage of both the chromatic aberration correction and the refractive index. Meanwhile, in a case where Conditional Expression (8-1) is satisfied, it is possible to make characteristics more satisfactory.

42<ν P 2<57 (8-1)

The value (dnP2/dt) is not set to be equal to or less than the lower limit of Conditional Expression (9), and thus it is possible to prevent a change in refractive index with respect to a change in temperature from excessively decreasing, and to prevent the correction of defocusing from being in deficiency. The value (dnP2/dt) is not set to be equal to or greater than the upper limit of Conditional Expression (9), and thus it is possible to prevent a change in refractive index with respect to a change in temperature from excessively increasing, and to prevent the correction of defocusing from being in excess. Meanwhile, in a case where Conditional Expression (9-1) is satisfied, it is possible to make characteristics more satisfactory.

6.5×10 −6 /° C.< dnP 2/ dt< 11×10 −6 /° C. (9-1)

In addition, it is preferable that the positive lens that satisfies Conditional Expressions (7) to (9) satisfies the following Conditional Expression (10), in a case where a focal length of the positive lens is set to fP2, and a focal length of the whole system during focusing on an infinite object is set to f. The value (fP2/f) is not set to be equal to or less than the lower limit of Conditional Expression (10), and thus it is possible to prevent the refractive power of the positive lens from becoming excessively strong, and to prevent the temperature correction effect from excessively increasing. The value (fP2/f) is not set to be equal to or greater than the upper limit of Conditional Expression (10), and thus it is possible to prevent the refractive power of the positive lens from becoming excessively weak, and to prevent the temperature correction effect from excessively decreasing. Meanwhile, in a case where Conditional Expression (10-1) is satisfied, it is possible to make characteristics more satisfactory.

›DESCRIPTION OF THE PREFERRED EMBODIMENTS · 3 of 6

fP 2/ f< 15 (10)

0.2< fP 2/ f< 5 (10-1)

In addition, the imaging lens may be a single-focus lens. In that case, it is preferable to satisfy the following Conditional Expression (11), and more preferable to satisfy the following Conditional Expression (11-1) in a case where a height of a paraxial on-axis light ray on an object-side surface of the negative lens that satisfies Conditional Expressions (1) to (3) is set to HN, and a maximum value of heights of a paraxial on-axis light ray on each lens surface of all lenses included in the imaging lens is set to Hmax. The value (|HN/Hmax|) is not set to be equal to or less than the lower limit of Conditional Expression (11), and thus it is possible to prevent the height of a paraxial on-axis light ray of the negative lens that satisfies Conditional Expressions (1) to (3) from becoming excessively small, and to prevent a correction effect with respect to a change in temperature from becoming excessively weak. Meanwhile, in a case where Conditional Expression (11-1) is satisfied, it is possible to make characteristics more satisfactory.

0.39−| HN/H max| (11)

0.49−| HN/H max|<1 (11-1)

In addition, the imaging lens may have a zooming function. In that case, in a case where defocusing with a change in temperature is corrected throughout the entire zooming region, it is preferable to satisfy the following Conditional Expression (12) in a case where a height of a paraxial on-axis light ray at a telephoto end on an object-side surface of the negative lens that satisfies Conditional Expressions (1) to (3) is set to HNt, a height of a paraxial on-axis light ray at the telephoto end of a surface having a maximum height of a paraxial on-axis light ray at a wide-angle end on each lens surface of all lenses included in the imaging lens is set to Htwm, a height of a paraxial on-axis light ray at the wide-angle end on the object-side surface of the negative lens that satisfies Conditional Expressions (1) to (3) is set to HNw, and a maximum value of heights of a paraxial on-axis light ray at the wide-angle end on each lens surface of all lenses included in the imaging lens is set to Hwwm. The value (|(HNt/Htwm)/(HNw/Hwwm)|) is not set to be equal to or less than the lower limit of Conditional Expression (12), and thus it is possible to prevent the height of an on-axis light ray at the telephoto end from becoming excessively small, and to secure a correction effect on the telephoto end side. The value (|(HNt/Htwm)/(HNw/Hwwm)|) is not set to be equal to or greater than the upper limit of Conditional Expression (12), and thus it is possible to prevent the height of an on-axis light ray at the wide-angle end from becoming excessively small, and to secure a correction effect on the wide-angle end side. Meanwhile, in a case where Conditional Expression (12-1) is satisfied, it is possible to make characteristics more satisfactory.

|( HNt/Htwm )/( HNw/Hwwm )|<1.8 (12)

0.4<|( HNt/Htwm )/( HNw/Hwwm )|<1.5 (12-1)

In addition, the imaging lens may have a zooming function. In that case, particularly, in a case where defocusing with a change in temperature at the telephoto end is corrected, it is preferable to satisfy the following Conditional Expression (13) in a case where a height of a paraxial on-axis light ray at a telephoto end on an object-side surface of the negative lens that satisfies Conditional Expressions (1) to (3) is set to HNt, a height of a paraxial on-axis light ray at the telephoto end of a surface having a maximum height of a paraxial on-axis light ray at a wide-angle end on each lens surface of all lenses included in the imaging lens is set to Htwm, a height of a paraxial on-axis light ray at the wide-angle end on the object-side surface of the negative lens that satisfies Conditional Expressions (1) to (3) is set to HNw, and a maximum value of heights of a paraxial on-axis light ray at the wide-angle end on each lens surface of all lenses included in the imaging lens is set to Hwwm. The value (|(HNt/Htwm)/(HNw/Hwwm)|) is not set to be equal to or less than the lower limit of Conditional Expression (13), and thus it is possible to prevent a difference between the heights of on-axis light rays at the wide-angle end and the telephoto end from excessively decreasing, and to prevent the correction of defocusing with a change in temperature at the telephoto end from being insufficient. Meanwhile, in a case where Conditional Expression (13-1) is satisfied, it is possible to make characteristics more satisfactory. The value (|(HNt/Htwm)/(HNw/Hwwm)|) is not set to be equal to or greater than the upper limit of Conditional Expression (13), and thus it is possible to prevent the difference between the heights of on-axis light rays at the wide-angle end and the telephoto end from excessively increasing, and to prevent the correction of defocusing with a change in temperature at the telephoto end from being in excess.

1.8<|( HNt/Htwm )/( HNw/Hwwm )| (13)

2<|( HNt/Htwm )/( HNw/Hwwm )|<50 (13-1)

In addition, in the example shown in FIG. 1 , an example is shown in which the optical member PP is disposed between the lens system and the image surface Sim, but instead of disposing various types of filters, such as a low-pass filter or a filter in which a specific wavelength region is cut, between the lens system and the image surface Sim, various types of filters described above may be disposed between respective lenses, or coating having the same actions as those of various types of filters may be performed on the lens surface of any of the lenses.

Next, numerical value examples of the imaging lens of the present invention will be described. First, an imaging lens of Example 1 will be described. FIG. 1 shows a cross-sectional view illustrating a lens configuration of the imaging lens of Example 1. In FIG. 1 and FIGS. 2 to 7 corresponding to Examples 2 to 7 described later, the left side is an object side, the right side is an image side, and a shown aperture stop St shows its position on the optical axis Z without necessarily indicating its size or shape. In addition, FIGS. 1 to 7 show a state of being focused on the infinite object, and show an on-axis light flux a and a light flux b of the maximum angle of view together.

›DESCRIPTION OF THE PREFERRED EMBODIMENTS · 4 of 6

The imaging lens of Example 1 is a single-focus lens, and is composed of sixteen lenses, that is, lenses L 1 to L 16 in order from the object side. In the imaging lens of Example 1, the lens L 16 (its material is S-LAL20 manufactured by OHARA INC.) is a negative lens that satisfies Conditional Expressions (1) to (3), the lens L 14 (its material is S-LAL54Q manufactured by OHARA INC.) is a positive lens that satisfies Conditional Expressions (7) to (9), and the lens L 9 is a positive lens having a largest Abbe number at the d line among positive lenses included in the imaging lens.

Table 1 shows basic lens data of the imaging lens of Example 1, and Table 2 shows data relating to specifications. In the following, the meanings of symbols in the tables will be described by taking an example of those in Example 1, but the same is basically true of Examples 2 to 7.

In the lens data of Table 1, the column of a surface number shows surface numbers sequentially increasing toward the image surface side with the surface of an element closest to the object side regarded as a first surface and, the column of a curvature radius shows curvature radii of respective surfaces, and the column of a surface distance shows distances on the optical axis Z between the respective surfaces and the next surfaces. In addition, the column of n shows refractive indexes of respective optical elements at the d line (a wavelength of 587.6 nm (nanometer)), the column of ν shows Abbe numbers of the respective optical elements at the d line (a wavelength of 587.6 nm (nanometer)), the column of dn/dt shows rates of change in refractive index at the d line (a wavelength of 587.6 nm (nanometer)) with respect to a change in temperature at 25° C. of the respective optical elements, the column of θgF shows partial dispersion ratios of the respective optical elements, and the column of Conditional Expression (5) shows values of Conditional Expression (5) of the respective optical elements. Meanwhile, in Table 1, “×10 −6 /° C.” is omitted with respect to the values of dn/dt.

In addition, the sign of the curvature radius is set to be positive in a case where a surface shape is convex on the object side, and is set to be negative in a case where a surface shape is convex on the image surface side. Basic lens data indicates the aperture stop St and optical member PP together. In the place of a surface number of a surface equivalent to the aperture stop St, a term of (stop) is written together with the surface number.

The data relating to specifications of Table 2 shows values of a focal length f, a back focus Bf, an F-Number FNo., and the total angle of view 2ω[° ].

For the basic lens data and the data relating to specifications, a degree (°) is used as the unit of an angle, and mm (millimeter) is used as the unit of a length, but it is also possible to use other appropriate units since an optical system can be used even in a case where the optical system is magnified or reduced in proportion.

FIG. 8 shows a diagram of aberrations of the imaging lens of Example 1. Meanwhile, spherical aberration, astigmatism, distortion, and lateral chromatic aberration are shown in order from the left side in FIG. 8 . The diagram of aberrations indicating spherical aberration, astigmatism, and distortion shows aberrations in which the d line (a wavelength of 587.6 nm (nanometer)) is used as a reference wavelength. In the spherical aberration diagram, aberrations relating to the d line (a wavelength of 587.6 nm (nanometer)), a C line (a wavelength of 656.3 nm (nanometer)), and an F line (a wavelength of 486.1 nm (nanometer)) are shown by a solid line, a long dashed line, and a short dashed line. In the astigmatism diagram, aberrations in a sagittal direction and a tangential direction are shown by a solid line and a short dashed line, respectively. In the lateral chromatic aberration diagram, aberrations relating to the C line (a wavelength of 656.3 nm (nanometer)) and the F line (a wavelength of 486.1 nm (nanometer)) are shown by a long dashed line and a short dashed line, respectively. Meanwhile, FNo. in the spherical aberration diagram means an F-Number, and w in the other aberration diagrams means a half angle of view.

Next, an imaging lens of Example 2 will be described. FIG. 2 shows a cross-sectional view illustrating a lens configuration of the imaging lens of Example 2. The imaging lens of Example 2 is a single-focus lens, and is composed of six lenses, that is, lenses L 1 to L 6 in order from the object side. In the imaging lens of Example 2, the lens L 1 (its material is S-LAL20 manufactured by OHARA INC.) is a negative lens that satisfies Conditional Expressions (1) to (3), the lens L 6 (its material is S-LAH52Q manufactured by OHARA INC.) is a positive lens that satisfies Conditional Expressions (7) to (9), and the lens L 5 is a positive lens having a largest Abbe number at the d line among positive lenses included in the imaging lens. In addition, Table 3 shows basic lens data of the imaging lens of Example 2, Table 4 shows data relating to specifications, and FIG. 9 shows a diagram of aberrations.

Next, an imaging lens of Example 3 will be described. FIG. 3 shows a cross-sectional view illustrating a lens configuration of the imaging lens of Example 3. The imaging lens of Example 3 has a zooming function, and is composed of fourteen lenses, that is, lenses L 1 to L 14 in order from the object side. In the imaging lens of Example 3, the lens L 2 (its material is S-LAL20 manufactured by OHARA INC.) is a negative lens that satisfies Conditional Expressions (1) to (3), the lens L 5 (its material is S-LAH52Q manufactured by OHARA INC.) and the lens L 7 (its material is S-LAL54Q manufactured by OHARA INC.) are positive lenses that satisfy Conditional Expressions (7) to (9), and the lens L 3 is a positive lens having a largest Abbe number at the d line among positive lenses included in the imaging lens. In addition, Table 5 shows basic lens data of the imaging lens of Example 3, Table 6 shows data relating to specifications, Table 7 shows data relating to changing surface distances, Table 8 shows data relating to aspherical coefficients, and FIG. 10 shows a diagram of aberrations.

›DESCRIPTION OF THE PREFERRED EMBODIMENTS · 5 of 6

The data relating to specifications of Table 6 shows values of a zoom magnification, a focal length f, a back focus Bf, an F-Number FNo., and the total angle of view 2ω[° ] with respect to each of the wide-angle end and the telephoto end.

In the lens data of Table 5, DD [surface number] is written in the places of surface distances having a change in distance during zooming. Numerical values corresponding to DD [surface number] are shown in Table 7.

In the lens data of Table 8, mark * is attached to the surface number of an aspherical surface, and the numerical values of a paraxial curvature radius are indicated as the curvature radius of the aspherical surface. The data relating to the aspherical coefficients of Table 8 indicates surface numbers of the aspherical surfaces and aspherical coefficients relating to these aspherical surfaces. “E±n” (n is an integer) in the numerical values of the aspherical coefficients of Table 8 means “×10 ±n ”. The aspherical coefficients are values of respective coefficients KA and Am in an aspherical expression represented by the following expression.

Zd=C·h 2 /{1+(1− KA·C 2 ·h 2 ) 1/2 }+ΣAm·h m

Here, Zd is an aspherical depth (length of a vertical line drawn from a point on an aspherical surface having a height h down to a plane perpendicular to the optical axis with which the vertex of the aspherical surface is in contact),

h is a height (distance from the optical axis),

C is a reciprocal of the paraxial curvature radius, and

KA and Am are aspherical coefficients.

Σ at an aspherical depth Zd means a total sum for m.

In addition, in the diagram of aberrations of FIG. 10 , a diagram of aberrations at the wide-angle end is shown on the upper portion, and a diagram of aberrations at the telephoto end is shown on the lower portion.

Meanwhile, the meanings of data relating to specifications, data relating to changing surface distances, data relating to aspherical coefficients, and symbols in a diagram of aberrations will be described by taking an example of those in Example 3, but the same is basically true of Examples 4 to 7.

Next, an imaging lens of Example 4 will be described. FIG. 4 shows a cross-sectional view illustrating a lens configuration of the imaging lens of Example 4. The imaging lens of Example 4 has a zooming function, and is composed of thirty lenses, that is, lenses L 1 to L 30 in order from the object side. In the imaging lens of Example 4, the lens L 7 (its material is S-LAL20 manufactured by OHARA INC.) and the lens L 26 (its material is S-LAL20 manufactured by OHARA INC.) are negative lenses that satisfy Conditional Expressions (1) to (3), and the lens L 4 is a positive lens having a largest Abbe number at the d line among positive lenses included in the imaging lens. In addition, Table 9 shows basic lens data of the imaging lens of Example 4, Table 10 shows data relating to specifications, Table 11 shows data relating to changing surface distances, and FIG. 11 shows a diagram of aberrations.

Next, an imaging lens of Example 5 will be described. FIG. 5 shows a cross-sectional view illustrating a lens configuration of the imaging lens of Example 5. The imaging lens of Example 5 has a zooming function, and is composed of twenty-one lenses, that is, lenses L 1 to L 21 in order from the object side. In the imaging lens of Example 5, the lens L 16 (its material is S-LAL20 manufactured by OHARA INC.) is a negative lens that satisfies Conditional Expressions (1) to (3), and the lens L 4 is a positive lens having a largest Abbe number at the d line among positive lenses included in the imaging lens. In addition, Table 12 shows basic lens data of the imaging lens of Example 5, Table 13 shows data relating to specifications, Table 14 shows data relating to changing surface distances, and FIG. 12 shows a diagram of aberrations.

Next, an imaging lens of Example 6 will be described. FIG. 6 shows a cross-sectional view illustrating a lens configuration of the imaging lens of Example 6. The imaging lens of Example 6 has a zooming function, and is composed of twenty-four lenses, that is, lenses L 1 to L 24 in order from the object side. In the imaging lens of Example 6, the lens L 11 (its material is S-LAL20 manufactured by OHARA INC.) is a negative lens that satisfies Conditional Expressions (1) to (3), and the lens L 7 is a positive lens having a largest Abbe number at the d line among positive lenses included in the imaging lens. In addition, Table 15 shows basic lens data of the imaging lens of Example 6, Table 16 shows data relating to specifications, Table 17 shows data relating to changing surface distances, and FIG. 13 shows a diagram of aberrations.

Next, an imaging lens of Example 7 will be described. FIG. 7 shows a cross-sectional view illustrating a lens configuration of the imaging lens of Example 7. The imaging lens of Example 7 has a zooming function, and is composed of twenty-eight lenses, that is, lenses L 1 to L 28 in order from the object side. In the imaging lens of Example 7, the lens L 18 (its material is S-LAL20 manufactured by OHARA INC.) is a negative lens that satisfies Conditional Expressions (1) to (3), and the lens L 20 (its material is S-LAH52Q manufactured by OHARA INC.) is a positive lens that satisfies Conditional Expressions (7) to (9), and the lens L 10 is a positive lens having a largest Abbe number at the d line among positive lenses included in the imaging lens. In addition, Table 18 shows basic lens data of the imaging lens of Example 7, Table 19 shows data relating to specifications, Table 20 shows data relating to changing surface distances, Table 21 shows data relating to aspherical coefficients, and FIG. 14 shows a diagram of aberrations.

Table 22 shows values corresponding to Conditional Expressions (1) to (13) of the imaging lens of Examples 1 to 7. Meanwhile, the d line is used as a reference wavelength in all the examples, and values shown in the following Table 22 are equivalent to those at this reference wavelength.

From the above-mentioned data, it can be understood that the imaging lenses of Examples 1 to 7 all satisfy any of Conditional Expressions (1) to (10) and Conditional Expressions (11) to (13), and are imaging lenses in which various aberrations such as chromatic aberration and field curvature are satisfactorily corrected while satisfactorily correcting defocusing due to a change in temperature.

›DESCRIPTION OF THE PREFERRED EMBODIMENTS · 6 of 6

Next, an optical apparatus according to an embodiment of the present invention will be described. FIG. 15 shows a schematic configuration diagram of an optical apparatus 100 using an imaging lens 1 according to an embodiment of the present invention, as an example of an optical apparatus according to an embodiment of the present invention. An example of the optical apparatus 100 includes a motion-picture camera, a broadcast camera, a digital camera, a video camera, a surveillance camera, or the like.

The optical apparatus 100 includes the imaging lens 1 , a filter 2 disposed on the image side of the imaging lens 1 , and an imaging element 3 disposed on the image side of the filter 2 . Meanwhile, in FIG. 15 , a plurality of lenses included in the imaging lens 1 are schematically shown.

The imaging element 3 is used to convert an optical image formed by the imaging lens 1 into an electrical signal, and can have, for example, a charge coupled device (CCD), a complementary metal oxide semiconductor (CMOS) or the like used thereas. The imaging element 3 is disposed so that the imaging surface thereof is coincident with the image surface of the imaging lens 1 .

In addition, the optical apparatus 100 includes a signal processing unit 5 that arithmetically processes an output signal from an imaging element 3 , a display portion 6 that displays an image formed by the signal processing unit 5 , and a zoom controller 7 that controls zooming of the imaging lens 1 . Meanwhile, in FIG. 15 , only one imaging element 3 is shown, but the optical apparatus of the present invention may be a so-called three-plate type of optical apparatus having three imaging elements without being limited.

Next, an optical apparatus according to another embodiment of the present invention will be described with reference to FIGS. 16 and 17 . A camera 200 showing perspective shapes of a front side and a rear surface side, respectively, in FIGS. 16 and 17 is a single-lens digital camera, having no reflex finder, which has an interchangeable lens 208 detachably mounted therein. The interchangeable lens 208 has an imaging lens 209 which is an optical system according to an embodiment of the present invention housed within a lens barrel.

This camera 200 includes a camera body 201 , and is provided with a shutter button 202 and a power button 203 on the upper surface of the camera body 201 . In addition, operating portions 204 and 205 and a display portion 206 are provided on the rear surface of the camera body 201 . The display portion 206 is used for displaying a captured image or an image within an angle of view before image capture.

An imaging aperture on which light from an imaging target is incident is provided on the front central portion of the camera body 201 , a mount 207 is provided at a position corresponding to the imaging aperture, and the interchangeable lens 208 is mounted onto the camera body 201 through this mount 207 .

The camera body 201 is provided therein with an imaging element (not shown) such as a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) that outputs an imaging signal according to a subject image formed by the interchangeable lens 208 , a signal processing circuit that processes the imaging signal which is output from the imaging element to generate an image, a recording medium for recording the generated image, and the like. In this camera 200 , a still image or a motion picture can be captured by pressing the shutter button 202 , and image data obtained by this image capture is recorded in the recording medium.

Hereinbefore, the present invention has been described through embodiments and examples, but the present invention is not limited to the above-described embodiments and examples, and can be variously modified. For example, values such as the curvature radius, the surface distance, the refractive index, and the Abbe number of each lens are not limited to the values shown in each of the above-described examples, and other values can be used therefor.

In addition, in the embodiment of the optical apparatus, a broadcast camera and a non-reflex type digital camera have been described by way of example with reference to the drawings, but the optical apparatus of the present invention is not limited thereto, and the present invention can also be applied to an optical apparatus such as, for example, a video camera, a digital camera other than a non-reflex type, or a motion-picture camera. Further, the optical apparatus including the imaging lens of the present invention may be applied to any apparatuses such as a projector without being limited to the cameras as described above.

›EXPLANATION OF REFERENCES

1 : imaging lens

2 : filter

3 : imaging element

5 : signal processing unit

6 : display portion

7 : zoom controller

100 : imaging apparatus

200 : camera

201 : camera body

202 : shutter button

203 : power button

204 , 205 : operating portion

206 : display portion

207 : mount

208 : interchangeable lens

209 : imaging lens

L 1 to L 30 : lens

PP: optical member

Sim: image surface

St: aperture stop

a: on-axis light flux

b: light flux of maximum angle of view

Z: optical axis

›Tables in the description — 22

TABLE 1 — EXAMPLE 1•LENS DATA (n AND v ARE BASED ON d LINE)

SURFACE	CURVATURE	SURFACE					EXPRESSION
NUMBER	RADIUS	DISTANCE	n	ν	θgF	dn/dt	(5)
1	436.2065	4.3542	1.48749	70.24	0.53007	−0.8	0.64372
2	−436.2065	0.2438
3	90.3149	9.1985	1.49700	81.54	0.53748	−6.1	0.66941
4	−303.0390	1.9496	1.65160	58.62	0.54102	3.1	0.63587
5	192.7307	1.3619
6	53.2590	2.0706	1.51742	52.43	0.55649	2.4	0.64132
7	35.0424	10.6348	1.49700	81.54	0.53748	−6.1	0.66941
8	103.2588	10.1387
9	58.2805	4.3382	1.90366	31.31	0.59481	3.6	0.64547
10	125.5233	1.9418	1.80610	40.93	0.57019	7	0.63641
11	35.6304	16.9295
12	42.8907	2.2673	1.56732	42.82	0.57309	2.9	0.64237
13	30.2253	6.8840	1.43875	94.66	0.53402	−6.2	0.68718
14	438.6286	8.2402
15(STOP)	∞	3.6368
16	357.1219	1.0199	1.85150	40.78	0.56958	5.4	0.63556
17	50.0030	3.1226
18	−78.3563	0.9580	1.72916	54.09	0.54490	4.9	0.63242
19	35.9157	3.2645	1.84666	23.78	0.62054	1.4	0.65902
20	118.8928	6.3200
21	122.1512	2.6266	1.89286	20.36	0.63944	1.1	0.67238
22	50.0834	8.2404	1.65100	56.24	0.54210	6.6	0.63310
23	−108.8489	19.9574
24	135.4182	5.0025	1.62588	35.70	0.58935	2.7	0.64711
25	−95.7474	16.7689
26	−108.9483	1.4930	1.69930	51.11	0.55523	−1.2	0.63793
27	−787.3933	62.9700
28	∞	3.2000	1.51680	64.20	0.53430
29	∞	5.8797

TABLE 2 — EXAMPLE 1•SPECIFICATION (d LINE)

f	242.52
Bf	70.96
FNo.	4.12
2ω[°]	13.4

TABLE 3 — EXAMPLE 2•LENS DATA (n AND ν ARE BASED ON d LINE)

SURFACE	CURVATURE	SURFACE					EXPRESSION
NUMBER	RADIUS	DISTANCE	n	ν	θgF	dn/dt	(5)
1	373.3289	0.9998	1.69930	51.11	0.55523	−1.2	0.63793
2	13.7465	4.4135
3	173.0372	4.4821	1.84666	23.78	0.62054	1.4	0.65902
4	−23.8724	0.1998
5	13.6968	0.9998	1.48749	70.24	0.53007	−0.7	0.64372
6	6.5504	13.9171
7(STOP)	∞	3.9257
8	40.6043	0.9998	1.84666	23.78	0.62054	1.4	0.65902
9	11.0954	5.7718	1.49700	81.54	0.53748	−6.1	0.66941
10	−11.2802	0.1998
11	15.6608	5.7220	1.79952	42.24	0.56758	10.2	0.63592
12	−251.4968	10.0000
13	∞	1.0000	1.51680	64.20	0.53430
14	∞	0.7616

TABLE 4 — EXAMPLE 2•SPECIFICATION (d LINE)

f	6.20
Bf	11.42
FNo.	1.30
2ω[°]	72.0

TABLE 5 — EXAMPLE 3•LENS DATA (n AND ν ARE BASED ON d LINE)

SURFACE	CURVATURE	SURFACE					EXPRESSION
NUMBER	RADIUS	DISTANCE	n	ν	θgF	dn/dt	(5)
*1	−86.8543	5.4000	1.49100	57.58	0.56866	−118.7	0.66182
*2	−91.5913	1.5002
3	187.3568	2.6626	1.69930	51.11	0.55523	−1.2	0.63793
4	31.3583	16.0871
5	−76.1939	1.6495	1.49700	81.61	0.53887	−6.4	0.67091
6	90.6936	DD[6]
7	−623.5670	3.0094	1.59270	35.31	0.59336	0.1	0.65049
8	234.2998	4.8231	1.79952	42.24	0.56758	10.2	0.63592
9	−157.3778	0.2997
10	86.8900	4.2023	1.83400	37.16	0.57759	7.7	0.63771
11	1187.0706	DD[11]
12	88.9944	4.9804	1.65100	56.24	0.54210	6.6	0.63310
13	−107.6741	1.3491	1.80000	29.84	0.60178	4.4	0.65006
14	377.3119	DD[14]
15	70.2400	4.0253	1.57135	52.95	0.55544	−0.5	0.64111
16	−185.5424	DD[16]
*17	150.7223	1.5000	1.80610	40.88	0.56889	0	0.63503
*18	44.5626	5.9329
19	−24.4333	1.5655	1.72151	29.23	0.60541	2.6	0.65270
20	41.3753	8.0139	1.49700	81.61	0.53887	−6.4	0.67091
21	−33.1564	0.2991
22	141.0514	8.7428	1.59270	35.31	0.59336	0.1	0.65049
23	−36.0156	DD[23]
24	101.7173	6.2570	1.49700	81.61	0.53887	−6.4	0.67091
25	−88.0449	16.8000
26	∞	35.5400	1.51633	64.14	0.53531
27	∞	0.0270

TABLE 6 — EXAMPLE 3•SPECIFICATION (d LINE)

	WIDE-ANGLE	TELEPHOTO
	END	END
ZOOM	1.0	2.1
MAGNIFICATION
f	22.42	47.07
Bf	40.3	40.3
FNo.	2.05	3.22
2ω[°]	74.6	39.2

TABLE 7 — EXAMPLE 3 VARIABLE SURFACE DISTANCE WIDE-ANGLE

	END	TELEPHOTO END
DD[6]	28.31	6.74
DD[11]	32.46	1.85
DD[14]	12.66	1.59
DD[16]	13.65	39.14
DD[23]	0.50	38.26

TABLE 8 — EXAMPLE 3 ASPHERICAL COEFFICIENT SURFACE

NUMBER	1	2
KA	−6.1271449E+00	−8.5150005E+00
A3	−5.2066671E−05	−5.4765446E−05
A4	2.0837597E−05	1.9900794E−05
A5	−6.8781461E−07	−6.9765880E−07
A6	6.5879516E−09	6.1544108E−09
A7	8.7884315E−11	1.1446136E−10
A8	−1.6907823E−12	−2.0639924E−12
SURFACE
NUMBER	17	18
KA	1.0000000E+00	1.0000000E+00
A4	3.5313538E−07	5.4249400E−06
A6	−1.1401863E−07	−1.1945183E−07
A8	4.5688395E−10	4.5868120E−10
A10	−7.9325572E−13	−8.8476257E−13

TABLE 9 — EXAMPLE 4•LENS DATA (n AND ν ARE BASED ON d LINE)

SURFACE	CURVATURE	SURFACE					EXPRESSION
NUMBER	RADIUS	DISTANCE	n	ν	θgF	dn/dt	(5)
1	183.6355	3.0008	1.53996	59.46	0.54418	1.9	0.64039
2	130.3985	15.4290	1.49700	81.54	0.53748	−6.1	0.66941
3	−741.0428	0.1281
4	167.9717	5.1458	1.83481	42.74	0.56490	5	0.63405
5	94.4302	13.3866	1.43875	94.66	0.53402	−6.2	0.68718
6	421.4789	9.58
7	92.6466	18.5702	1.43875	94.66	0.53402	−6.2	0.68718
8	−296.8343	2.2514	1.48749	70.24	0.53007	−0.8	0.64372
9	247.1501	DD[9]
10	184.9709	1.7844	1.69930	51.11	0.55523	−1.2	0.63793
11	58.0940	13.2969
12	161.3581	1.2105	1.74400	44.79	0.56560	3	0.63807
13	109.9764	5.5699
14	1806.5468	1.2072	1.72916	54.68	0.54451	4.1	0.63298
15	19.9826	5.0049	1.80518	25.42	0.61616	1.2	0.65729
16	42.7748	2.6573
17	−51.4949	2.9795	1.80518	25.42	0.61616	1.2	0.65729
18	−21.4215	1.2224	1.80400	46.53	0.55775	4.5	0.63304
19	140.2982	DD[19]
20	77.7025	4.4019	1.49700	81.54	0.53748	−6.1	0.66941
21	−94.7999	0.1202
22	81.0558	2.2718	1.95375	32.32	0.59015	4.8	0.64244
23	39.3973	5.2587	1.43875	94.66	0.53402	−6.2	0.68718
24	−171.9642	0.1203
25	85.1990	2.9106	1.43875	94.66	0.53402	−6.2	0.68718
26	960.9584	0.4677
27	71.6415	3.5441	1.51633	64.14	0.53531	2.7	0.63909
28	126.8975	DD[28]
29(STOP)	∞	0.9463
30	111.3980	1.2591	1.83481	42.74	0.56490	5	0.63405
31	25.5684	6.5211	1.51742	52.43	0.55649	2.4	0.64132
32	−23.1807	1.5186	1.51633	64.14	0.53531	2.7	0.63909
33	−1355.5219	6.3987
34	−84.8771	1.3351	1.51633	64.14	0.53531	2.7	0.63909
35	56.6825	0.8767
36	19.5654	3.5002	1.66680	33.05	0.59578	1.7	0.64925
37	205.1287	1.2325
38	−70.4615	2.3862	1.83481	42.74	0.56490	5	0.63405
39	31.6981	30.0189
40	37.0004	2.4074	1.68893	31.07	0.60041	2.6	0.65068
41	−59.8776	0.1332
42	29.5443	2.5805	1.49700	81.54	0.53748	−6.1	0.66941
43	−35.0484	0.8014	1.69930	51.11	0.55523	−1.2	0.63793
44	169.2974	1.1583
45	54.3737	1.2058	1.88300	40.76	0.56679	4.8	0.63274
46	26.9531	2.2959
47	∞	1.0000	1.51680	64.20	0.53430	2.8	0.63818
48	∞	4.1002
49	322.9618	1.2612	1.89190	37.13	0.57813	5.2	0.63821
50	12.2253	3.7481	1.49700	81.54	0.53748	−6.1	0.66941
51	−22.9978	5.0000
52	∞	1.0000	1.51633	64.05	0.53463
53	∞	21.1467

TABLE 10 — EXAMPLE 4•SPECIFICATION (d LINE)

	WIDE-ANGLE	TELEPHOTO
	END	END
ZOOM	1.0	79.9
MAGNIFICATION
f	14.50	1158.68
Bf	26.8	26.8
FNo.	3.60	10.85
2ω[°]	34.0	0.4

TABLE 11 — EXAMPLE 4 VARIABLE SURFACE DISTANCE

	WIDE-ANGLE	TELEPHOTO
	END	END
DD[9]	0.56	92.61
DD[19]	166.38	0.40
DD[28]	2.67	76.60

TABLE 12 — EXAMPLE 5•LENS DATA (n AND ν ARE BASED ON d LINE)

SURFACE	CURVATURE	SURFACE					EXPRESSION
NUMBER	RADIUS	DISTANCE	n	ν	θgF	dn/dt	(5)
1	211.4312	2.8000	1.75500	52.32	0.54765	4.9	0.63230
2	86.9910	11.8070	1.61800	63.33	0.54414	−3.6	0.64661
3	−599.6501	0.1500
4	209.6825	2.7000	1.81600	46.62	0.55682	5.2	0.63225
5	69.0890	11.3118	1.49700	81.54	0.53748	−6.1	0.66941
6	665.9449	0.1500
7	67.0279	10.3008	1.49700	81.54	0.53748	−6.1	0.66941
8	325.0117	DD[8]
9	26.1848	1.2000	1.83481	42.71	0.56431	4.7	0.63341
10	13.5873	7.6524
11	−49.9862	2.6648	1.80809	22.76	0.63073	−0.2	0.66756
12	−25.1370	1.1000	1.80400	46.57	0.55724	4.6	0.63259
13	73.3877	0.2104
14	24.5654	2.8483	1.80518	25.42	0.61616	1.2	0.65729
15	45.2385	DD[15]
16	−37.5885	1.1000	1.83481	42.71	0.56431	4.7	0.63341
17	59.0000	2.2351	1.80809	22.76	0.63073	−0.2	0.66756
18	−196.5706	DD[18]
19(STOP)	∞	2.4800
20	127.1671	5.8300	1.51680	64.20	0.53430	2.7	0.63818
21	−37.6510	0.8800
22	40.9980	6.2400	1.49700	81.54	0.53748	−6.1	0.66941
23	−40.9980	1.2000	1.72000	50.23	0.55214	5.5	0.63341
24	124.1341	0.9100
25	34.1490	6.6200	1.49700	81.54	0.53748	−6.1	0.66941
26	−34.1490	1.2400	1.69930	51.11	0.55523	−1.2	0.63793
27	38.3356	0.1000
28	24.2208	6.0200	1.58913	61.13	0.54067	3.7	0.63958
29	∞	5.0000
30	22.6812	2.0000	1.49700	81.54	0.53748	−6.1	0.66941
31	15.0362	15.6200
32	15.6369	4.9600	1.49700	81.54	0.53748	−6.1	0.66941
33	−21.6100	3.9700	1.91082	35.25	0.58224	5.2	0.63927
34	24.3818	7.1600
35	−249.3668	2.1500	1.94595	17.98	0.65460	3.6	0.68369
36	−36.9311	22.2700
37	∞	2.0000	1.51633	64.14	0.53531
38	∞	1.4581

TABLE 13 — EXAMPLE 5•SPECIFICATION (d LINE)

	WIDE-ANGLE	TELEPHOTO
	END	END
ZOOM	1.0	30.9
MAGNIFICATION
f	12.87	397.18
Bf	25.0	25.0
FNo.	3.19	5.25
2ω[°]	39.0	1.4

TABLE 14 — EXAMPLE 5 VARIABLE SURFACE DISTANCE

	WIDE-ANGLE	TELEPHOTO
	END	END
DD[8]	0.94	94.39
DD[15]	92.27	14.77
DD[18]	18.60	1.46

TABLE 15 — EXAMPLE 6•LENS DATA (n AND ν ARE BASED ON d LINE)

SURFACE	CURVATURE	SURFACE					EXPRESSION
NUMBER	RADIUS	DISTANCE	n	ν	θgF	dn/dt	(5)
1	140.9205	2.5300	1.77250	49.60	0.55212	4.4	0.63237
2	52.2267	21.6512
3	−166.7985	2.6000	1.69560	59.05	0.54348	−0.3	0.63902
4	235.2619	0.3854
5	83.1939	4.4025	1.89286	20.36	0.63944	1.1	0.67238
6	124.9656	DD[6]
7	355.5039	2.0000	1.75520	27.51	0.61033	2	0.65484
8	122.0348	14.0200	1.49700	81.54	0.53748	−6.1	0.66941
9	−106.8135	DD[9]
10	103.2843	2.2198	1.59270	35.31	0.59336	0.1	0.65049
11	53.1587	16.2600	1.43875	94.66	0.53402	−6.2	0.68718
12	−153.8620	0.1200
13	82.4682	6.1925	1.69560	59.05	0.54348	−0.3	0.63902
14	640.7420	DD[14]
15	356.7215	2.2993	1.49700	81.54	0.53748	−6.1	0.66941
16	−441.3212	DD[16]
17	95.9105	1.3800	1.88300	40.76	0.56679	4.8	0.63274
18	31.5265	6.1493
19	−41.2079	1.0500	1.69930	51.11	0.55523	−1.2	0.63793
20	48.9239	4.2053
21	59.7630	4.8579	1.69895	30.13	0.60298	3.6	0.65173
22	−49.8633	1.0600	1.69560	59.05	0.54348	−0.3	0.63902
23	−128.7417	DD[23]
24	−39.4445	1.0494	1.63246	63.77	0.54215	−2.7	0.64533
25	34.4408	4.5400	1.62588	35.70	0.58935	2.7	0.64711
26	−321.9409	DD[26]
27(STOP)	∞	1.4000
28	78.1523	3.5579	1.91650	31.60	0.59117	7.3	0.64230
29	−135.5103	0.1992
30	31.0796	8.1314	1.49700	81.54	0.53748	−6.1	0.66941
31	−38.5780	1.1009	1.91082	35.25	0.58224	5.2	0.63927
32	160.9377	9.3847
33	−1849.3833	3.4782	1.74950	35.28	0.58704	5.8	0.64412
34	−43.9996	0.9991
35	31.9053	1.5458	1.90043	37.37	0.57720	4	0.63766
36	15.9095	5.4398	1.63246	63.77	0.54215	−2.7	0.64533
37	45.1586	0.1200
38	25.9984	6.1793	1.43875	94.66	0.53402	−6.2	0.68718
39	−29.8900	2.0000	1.95375	32.32	0.59015	4.3	0.64244
40	32.0497	21.3983
41	48.7036	3.8155	1.72047	34.71	0.58350	3.5	0.63966
42	1630.0773	35.0000
43	∞	2.3000	1.51633	64.14	0.53531
44	∞	2.8127

TABLE 16 — EXAMPLE 6•SPECIFICATION (d LINE)

	WIDE-ANGLE	TELEPHOTO
	END	END
ZOOM	1.0	5.8
MAGNIFICATION
f	20.83	120.51
Bf	39.3	39.3
FNo.	3.31	3.31
2ω[°]	72.2	13.4

TABLE 17 — EXAMPLE 6 VARIABLE SURFACE DISTANCE

	WIDE-ANGLE	TELEPHOTO
	END	END
DD[14]	1.00	38.98
DD[16]	1.00	18.97
DD[23]	46.55	3.25
DD[26]	14.65	2.00

TABLE 18 — EXAMPLE 7•LENS DATA (n AND ν ARE BASED ON d LINE)

SURFACE	CURVATURE	SURFACE					EXPRESSION
NUMBER	RADIUS	DISTANCE	n	ν	θgF	dn/dt	(5)
*1	565.2197	3.0000	1.80100	34.97	0.58642	3.6	0.64300
2	33.7366	17.0002
*3	121.9957	2.0000	1.49700	81.54	0.53748	−6.1	0.66941
4	55.9914	15.9998
5	−72.3275	1.8899	1.95375	32.32	0.59015	4.3	0.64244
6	−206.3175	0.3000
7	134.4001	6.5789	1.84666	23.78	0.61923	0.6	0.65771
8	−288.2885	DD[8]
9	−2499.1061	6.3166	1.53775	74.70	0.53936	−4.3	0.66022
10	−94.8862	DD[10]
11	117.7845	7.6115	1.43875	94.66	0.53402	−6.2	0.68718
*12	−177.1447	3.9652
13	−78.0906	1.8000	1.80100	34.97	0.58642	3.6	0.64300
14	−132.5404	0.1200
15	180.1651	1.8000	1.95375	32.32	0.59015	4.3	0.64244
16	64.4387	16.5240	1.43875	94.66	0.53402	−6.2	0.68718
17	−58.0608	0.1200
18	265.1261	7.8469	1.43387	95.18	0.53733	−10.1	0.69133
19	−87.7409	0.1200
20	54.2020	4.5533	1.72916	54.68	0.54451	4.1	0.63298
21	94.0953	DD[21]
22	38.3802	0.8000	2.00100	29.13	0.59952	4	0.64665
23	15.4389	4.9352
24	−33.1368	0.8000	1.90043	37.37	0.57720	4.2	0.63766
25	51.3162	5.3048	1.80518	25.42	0.61616	1.2	0.65729
26	−16.0812	0.8100	1.75500	52.32	0.54765	5	0.63230
27	62.8005	0.1200
28	32.6354	5.8153	1.67270	32.10	0.59891	3	0.65085
29	−17.4107	0.8000	1.95375	32.32	0.59015	4.3	0.64244
30	−69.1716	DD[30]
31	−32.9450	0.8100	1.69930	51.11	0.55523	−1.2	0.63793
32	90.0437	1.9099	1.92286	18.90	0.64960	2.1	0.68018
33	−2000.0013	DD[33]
34(STOP)	∞	0.9999
*35	64.8090	5.2583	1.79952	42.24	0.56758	10.2	0.63592
36	−101.6923	0.1200
37	423.8735	4.7781	1.56883	56.36	0.54890	1.9	0.64009
38	−39.3672	1.0000	1.95375	32.32	0.59015	4.3	0.64244
39	−91.2427	35.3539
40	171.3851	3.7643	1.85478	24.80	0.61232	4.4	0.65245
41	−71.9178	1.9395
42	39.6671	6.4312	1.48749	70.24	0.53007	−0.8	0.64372
43	−46.6783	1.0000	1.95375	32.32	0.59015	4.3	0.64244
44	26.9818	1.7762
45	31.7333	8.3926	1.55032	75.50	0.54001	−5.5	0.66217
46	−26.9678	1.0000	1.95375	32.32	0.59015	4.3	0.64244
47	−83.3955	0.1200
48	68.1164	5.7708	1.48749	70.24	0.53007	−0.8	0.64372
49	−35.3678	10.0000
50	∞	33.0000	1.60859	46.44	0.56664
51	∞	14.2000	1.51633	64.05	0.53463
52	∞	0.6341

TABLE 19 — EXAMPLE 7•SPECIFICATION (d LINE)

	WIDE-ANGLE	TELEPHOTO
	END	END
ZOOM	1.0	12.6
MAGNIFICATION
f	4.67	58.57
Bf	40.5	40.5
FNo.	1.86	2.66
2ω[°]	105.2	10.8

TABLE 20 — EXAMPLE 7 VARIABLE SURFACE DISTANCE

	WIDE-ANGLE	TELEPHOTO
	END	END
DD[21]	0.69	47.22
DD[30]	45.22	5.91
DD[33]	9.00	1.78

TABLE 21 — EXAMPLE 7 ASPHERICAL COEFFICIENT SURFACE

NUMBER	1	3
KA	1.0000000E+00	1.0000000E+00
A4	2.2303957E−06	−4.5266299E−07
A6	−7.8493629E−10	−9.4818716E−10
A8	9.3362230E−13	5.0541928E−12
A10	−1.3439006E−15	−2.3924652E−14
A12	1.2175718E−18	5.2090634E−17
A14	−6.6155710E−22	−6.1618016E−20
A16	2.1346249E−25	4.1238028E−23
A18	−3.7850627E−29	−1.4731950E−26
A20	2.8652251E−33	2.1700122E−30
SURFACE
NUMBER	12	35
KA	1.0000000E+00	1.0000000E+00
A4	1.2334578E−06	−2.8403710E−06
A6	−9.7497468E−11	2.7887941E−10
A8	−6.2816070E−13	1.1936837E−11
A10	3.0118492E−15	−1.2231273E−13
A12	−9.7610693E−18	8.7181876E−16
A14	1.8560380E−20	−4.1438803E−18
A16	−2.0470604E−23	1.1853330E−20
A18	1.2118640E−26	−1.8191540E−23
A20	−2.9721665E−30	1.1446572E−26

TABLE 22

EXPRESSION	CONDITIONAL	EXAMPLE	EXAMPLE	EXAMPLE	EXAMPLE
NUMBER	EXPRESSION	1	2	3	4
(1)	nN	1.69930	1.69930	1.69930	1.69930
(2)	νN	51.11	51.11	51.11	51.11
(3)	dnN/dt	1.2	−1.2	−1.2	−1.2
(4)	νP1	94.66	81.54	81.61	94.66
(5)	θP1gF + 0.001618 × νP1	0.6872	0.6694	0.6709	0.6872
(6)	\|fN\|/f	0.75	3.30	1.15(t)~2.42(w)	0.11(t)~8.40(w)
					0.04(t)~2.86(w)
(7)	nP2	1.65100	1.79952	1.65100	NONE
				1.79952
(8)	νP2	56.24	42.24	56.24	NONE
				42.24
(9)	dnP2/dt	6.6	10.2	6.6	NONE
				10.2
(10)	fP2/f	0.22	3.00	2.52(t)~5.28(w)	NONE
				1.61(t)~3.37(w)
(11)	\|HN/Hmax\|	0.536	0.427	NONE	NONE
(12)	\|(HNt/Htwm)/	NONE	NONE	1.432	12.493
	(HNw/Hwwm)\|				0.483
(13)	\|(HNt/Htwm)/	NONE	NONE	1.432	12.493
	(HNw/Hwwm)\|				0.483
EXPRESSION	CONDITIONAL	EXAMPLE	EXAMPLE	EXAMPLE
NUMBER	EXPRESSION	5	6	7
(1)	nN	1.69930	1.69930	1.69930
(2)	νN	51.11	51.11	51.11
(3)	dnN/dt	−1.2	−1.2	−1.2
(4)	νP1	81.54	94.66	95.18
(5)	θP1gF + 0.001618 × νP1	0.6694	0.6872	0.6913
(6)	\|fN\|/f	0.06(t)~1.99(w)	0.26(t)~1.53(w)	0.59(0~7.37(w)
(7)	nP2	NONE	NONE	1.79952
(8)	νP2	NONE	NONE	42.24
(9)	dnP2/dt	NONE	NONE	10.2
(10)	fP2/f	NONE	NONE	0.86(t)~10.75(w)
(11)	\|HN/Hmax\|	NONE	NONE	NONE
(12)	\|(HNt/Htwm)/	1.007	2.282	1.221
	(HNw/Hwwm)\|
(13)	\|(HNt/Htwm)/	1.007	2.282	1.221
	(HNw/Hwwm)\|

Claims as granted

16 claims

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5 codes

IPC · International Patent Classification

Section G — Physics

G02B15/177
G02B13/04
G02B13/00
G02B27/00
G02B9/64

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