An object is to provide a high-resolution zoom lens system which has fewer lens elements and therefore, can be retracted into a compact form when not in use; and the zoom lens system, in order from the object side, comprises a first lens unit G 1 having negative power, a second lens unit G 2 having positive power and a third lens unit G 3 having positive power, wherein magnification is varied with change in intervals between each lens unit by independently moving each lens unit along an optical axis, in which the first lens unit G 1 comprises one negative lens element L 1 and one positive lens element L 2 , the second lens unit G 2 comprises only a cemented lens element having set of three lens elements L 3 , L 4 and L 5 which are cemented with each other, and the third lens unit G 3 comprises one positive lens element L 6.

Description

12 parts

›BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a zoom lens system, an imaging device and a camera, and more particularly, to a small-size and high-image-quality zoom lens system having a viewing angle of 60° to 70° at the wide-angle limit and a zoom ratio of about 3×, which is suitable for digital still cameras, digital video cameras and the like, an imaging device having the zoom lens system, and a camera having the imaging device.

2. Description of the Background Art

In digital still cameras using a solid-state image sensor such as a CCD (charge coupled device) or a CMOS (complementary metal-oxide semiconductor), since a member such as an optical low-pass filter is disposed between the rearmost part of the lens elements and the solid-state image sensor, a lens system having a comparatively long back focal length is required. Moreover, the image-taking optical system of digital still cameras is required of an excellent telecentric characteristic in order to avoid shading which is a factor that decreases the quantity of peripheral light on the image surface.

Many forms of digital still cameras can be considered, and one form is a compact type. As zoom lens systems suitable for compact-type digital still cameras, there have been proposed many three-unit zoom lens systems, in order from the object side, including a first lens unit having negative power, a second lens unit having positive power and a third lens unit having positive power (Japanese Laid-Open Patent Publications Nos. 2002-196240, 2001-242378, 2001-272602 and 2003-287679).

However, in the zoom lens system described in Japanese Laid-Open Patent Publication No. 2002-196240, the second lens unit has many lens elements and therefore, it is difficult to retract the zoom lens system into a compact form when not in use. The zoom lens system described in Japanese Laid-Open Patent Publication No. 2001-242378 has fewer lens elements, but the second lens unit has a large thickness and therefore, it is difficult to retract the zoom lens system into a compact form when not in use. The zoom lens system described in Japanese Laid-Open Patent Publication No. 2001-272602 has fewer lens elements and therefore, can be retracted into a compact form. However, the zoom ratio thereof is as small as about 2×. In Japanese Laid-Open Patent Publication No.2003-287679, there is disclosed a zoom lens system in which the second lens unit includes a cemented lens element having three lens elements which are cemented with each other. However, the second lens unit has a large overall thickness.

›SUMMARY OF THE INVENTION · 1 of 2

An object of the present invention is to provide a high-resolution zoom lens system which has fewer lens elements and therefore, can be retracted into a compact form when not in use, and an imaging device using the zoom lens system. Moreover, an object of the present invention is to provide a camera having the imaging device.

The above objects are achieved by the following zoom lens system for forming an optical image of an object with variable magnification, in order from the object side, comprising:

a first lens unit having negative power, a second lens unit having positive power and a third lens unit having positive power,

wherein

magnification is varied with change in intervals between each lens unit by independently moving each lens unit along an optical axis, and

characterized in that

the first lens unit comprises one negative lens element and one positive lens element; the second lens unit comprises only a cemented lens element having set of three lens elements which are cemented with each other; and the third lens unit comprises one positive lens element.

Preferably, the zoom lens system comprises a diaphragm on an object side of the second lens unit. Preferably, the first lens unit, in order from the object side, comprises one negative lens element and one positive lens element. Preferably, the second lens unit comprises a cemented lens element, in order from the object side, having a positive lens element, a negative lens element and a positive lens element, which are cemented with each other.

Preferably, the conditions are satisfied:

nd 4<1.75 (1)

ν d 4<35 (2)

where nd 4 is a refractive index to a d-line of the negative lens element of the second lens unit, and νd 4 is Abbe number thereof.

Preferably, the condition is satisfied:

0.2 <|fL 4|/ fG 2<0.4 (3)

where fG 2 is a focal length of the second lens unit, and fL 4 is a focal length of the negative lens element.

Preferably, the condition is satisfied:

3 <dGsi/Z< 5 (4)

(here, Z>2.5)

where Z is a zoom ratio at wide-angle and telephoto limits when a shooting distance is ∞, dGi is a thickness of an i-th lens unit (i is an integer), and dGsi [unit: mm] is a sum of thickness of each lens unit.

Preferably, focusing from an infinity object point to a close object point is performed by moving the third lens unit in the direction of an optical axis. Preferably, one positive lens element of the third lens unit is a biconvex lens.

The above objects are achieved by the following imaging device capable of converting an optical image of a subject to an electric image signal and outputting the electric image signal, comprising:

a zoom lens system for forming the optical image of the subject with variable magnification, and an image sensor for converting the optical image of the subject formed by the zoom lens system to the electric signal,

wherein

the zoom lens system, in order from an object side, comprises a first lens unit having negative power, a second lens unit having positive power and a third lens unit having positive power, in which magnification is varied with change in intervals between each lens unit by independently moving each lens unit along an optical axis, and

characterized in that

Preferably, the conditions are satisfied:

nd 4<1.75 (1)

ν d 4<35 (2)

where nd 4 is a refractive index to a d-line of the negative lens element of the second lens unit, and νd 4 is Abbe number thereof.

Preferably, the condition is satisfied:

0.2 <|fL 4|/ fG 2<0.4 (3)

where fG 2 is a focal length of the second lens unit, and fL 4 is a focal length of the negative lens element.

Preferably, the condition is satisfied:

3 <dGsi/Z< 5 (4)

(here, Z> 2.5)

The above objects are achieved by the following camera capable of image-taking a subject and outputting an image as an electric image signal, comprising:

an imaging device comprising a zoom lens system for forming an optical image of the subject with variable magnification and an image sensor for converting the optical image of the subject formed by the zoom lens system to the electric signal,

wherein

characterized in that

Preferably, the camera is a digital still camera capable of obtaining a still image of the subject. Preferably, the camera is a digital video camera capable of obtaining a moving image of the subject.

›SUMMARY OF THE INVENTION · 2 of 2

According to the present invention, it is possible to provide a high-resolution zoom lens system which has fewer lens elements and therefore, can be retracted into a compact form when not in use, and an imaging device using the zoom lens system. According to the present invention, it is also possible to provide a camera having the imaging device.

The zoom lens system of the present invention is applicable to digital input apparatuses such as digital still cameras, digital video cameras, mobile telephones, PDAs (personal digital assistances), surveillance cameras in surveillance systems, web cameras and vehicle-mounted cameras, and particularly, suitable for use as an image-taking optical system such as a digital still camera or a digital video camera, which requires high image quality.

These and other objects, features, aspects and effects will become more apparent from the following detailed description when taken in conjunction with the accompanied drawings.

›BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1A to 1C are construction views of a zoom lens system according to Embodiment 1 (Example 1);

FIGS. 2A to 2I are aberration graphics of the zoom lens system according to Example 1;

FIGS. 3A to 3C are construction views of a zoom lens system according to Embodiment 2 (Example 2);

FIGS. 4A to 4I are aberration graphics of the zoom lens system according to Example 2;

FIGS. 5A to 5C are construction views of a zoom lens system according to Embodiment 3 (Example 3);

FIGS. 6A to 6I are aberration graphics of the zoom lens system according to Example 3;

FIGS. 7A to 7C are construction views of a zoom lens system according to Embodiment 4 (Example 4);

FIGS. 8A to 8I are aberration graphics of the zoom lens system according to Example 4; and

FIG. 9 is a schematic construction view of a digital still camera according to Embodiment 5.

›DESCRIPTION OF THE PREFERRED EMBODIMENTS · 1 of 2

Embodiments 1 to 4

FIGS. 1A to 1C are construction views of a zoom lens system according to Embodiment 1. FIGS. 3A to 3C are construction views of a zoom lens system according to Embodiment 2. FIGS. 5A to 5C are construction views of a zoom lens system according to Embodiment 3. FIGS. 7A to 7C are construction views of a zoom lens system according to Embodiment 4. These views each show a zoom lens system in the infinity in-focus condition. FIGS. 1A , 3 A, 5 A and 7 A each show the lens configuration at the wide-angle limit (the shortest focal length condition: the focal length fW). FIGS. 1B , 3 B, 5 B and 7 B each show the lens configuration at the middle position (the middle focal length condition: the focal length fM=√{square root over ( )} (fW*fT)). FIGS. 1C , 3 C, 5 C and 7 C each show the lens configuration at the telephoto limit (the longest focal length condition: the focal length fT).

The zoom lens systems according to according to Embodiments 1 to 4 each, in order from the object side, comprises a first lens unit G 1 having negative power, a diaphragm A, a second lens unit G 2 having positive power and a third lens unit G 3 having positive power. In the zoom lens systems according to Embodiments 1 to 4, the first lens unit moves toward the image side in a convex trace, the second lens unit and the diaphragm monotonously move toward the object side, and the third lens unit moves toward the image side in a convex or concave trace at the object side, while magnification is varied from the wide-angle limit to the telephoto limit.

In the zoom lens systems according to Embodiments 1 to 4, the first lens unit G 1 comprises two lens elements of, in order from the object side, a negative meniscus lens element L 1 whose convex surface faces the object side and a positive meniscus lens element L 2 whose convex surface faces the object side. In the zoom lens systems according to Embodiments 1 to 4, the second lens unit G 2 comprises only a cemented lens element having set of three lens elements of, in order from the object side, a biconvex lens element L 3 , a biconcave lens element L 4 and a positive meniscus lens element L 5 whose convex surface faces the object side, which are cemented with each other. In the zoom lens systems according to Embodiments 1 to 4, the third lens unit G 3 comprises one biconvex positive lens element L 6 . In each view, the straight line shown on the right most side indicates the position of the image surface S, and a plane parallel plate P equivalent to an optical low-pass filter, a phase plate of the image sensor or the like is disposed on the object side of the image surface S.

In the zoom lens systems according to Embodiments 1 to 4, each lens unit is disposed in a desired power arrangement, whereby the overall size of the lens system can be reduced while optical performance is maintained.

Particularly, in the zoom lens systems according to Embodiments 1 to 4, the first lens unit G 1 , in order from the object side, comprises one negative lens element and one positive lens element, the second lens unit G 2 comprises only a cemented lens element having set of three lens elements which are cemented with each other, and the third lens unit G 3 comprises one positive lens element. The zoom lens systems according to Embodiments 1 to 4 having such a construction are optical systems which have fewer lens elements in each lens unit and therefore, can be retracted into a compact form when not in use.

Moreover, in the zoom lens systems according to Embodiments 1 to 4, the second lens unit G 2 comprises only a cemented lens element, in order from the object side, having a positive lens element, a negative lens element and a positive lens element, which are cemented with each other. In the zoom lens systems according to Embodiments 1 to 4 having such a construction, the second lens unit G 2 can be constructed in a compact form. Moreover, in the zoom lens systems according to Embodiments 1 to 4 having such a construction, it is easy to center the lens elements with each other and therefore, the assembly process is facilitated, as compared with a case where three lens elements are disposed independently and separately from one another.

Moreover, in the zoom lens systems according to Embodiments 1 to 4, the third lens unit G 3 comprises one biconvex positive lens element. With the zoom lens systems according to these embodiments having such a construction, the size when collapsed can be reduced. Furthermore, in the zoom lens systems according to these embodiments, it is possible to perform focusing from the infinity in-focus condition to the close object in-focus condition by moving the third lens unit G 3 along the optical axis.

Conditions to be satisfied by the zoom lens systems according to the embodiments will be described. While a plurality of conditions to be satisfied are defined for the zoom lens systems according to these embodiments, a zoom lens system construction which satisfies all the conditions is most preferable. However, by satisfying an individual condition, a zoom lens system showing the corresponding effect can be obtained.

It is preferable that the zoom lens systems according to the embodiments satisfy the conditions:

nd 4<1.75 (1)

νd νd 4<35 (2)

where nd 4 is the refractive index to the d-line of the negative lens element of the second lens group, and νd 4 is the Abbe number thereof.

When the value of the Condition (1) exceeds the upper limit, the Petzval sum becomes large, and it is difficult to correct field curvature. When the value of the Condition (2) exceeds the upper limit, it is difficult to correct chromatic aberration.

It is preferable that the zoom lens systems according to the embodiments satisfy the condition:

0.2 <|fL 4 |/fG 2<0.4 (3)

where fG 2 is the focal length of the second lens unit, and fL 4 is the focal length of the negative lens element of the second lens unit.

The Condition (3) is a condition for reducing the total optical length of the entire lens system while correcting various aberrations in the second lens unit in a well-balanced manner. When the value of the Condition (3) exceeds the upper limit, it is difficult to correct spherical aberration and coma aberration in the negative lens element of the second lens unit, by other lens elements. On the other hand, when the value of the Condition (3) exceeds the lower limit, the total optical length of the entire lens system increases, and it is difficult to reduce the size of the lens system.

›DESCRIPTION OF THE PREFERRED EMBODIMENTS · 2 of 2

When the following ranges are additionally defined for the Condition (3), the above effect can be further enhanced.

0.22 <|fL 4 |/fG 2 (3)′

| fL 4|/ fG 2<0.3 (3)′

It is preferable that the zoom lens systems according to the embodiments satisfy the condition:

3 <dGsi/Z< 5 (4)

(here, Z>2.5)

where Z is the zoom ratio at the wide-angle and telephoto limits when the shooting distance is ∞, dGi is the thickness of the i-th lens unit (i is an integer), and dGsi is the sum of the thickness of each lens unit.

The Condition (4) relates to the thickness of the lens units. When the value exceeds the upper limit, it is difficult to reduce the size of the entire lens system, particularly to reduce the total optical length when collapsed, while maintaining the zoom ratio. On the other hand, when the value exceeds the lower limit, it is difficult to correct aberrations over the entire zoom range while maintaining the zoom ratio.

When the following ranges are additionally defined for the Condition (4), the above effect can be further enhanced.

3.3 <dGsi/Z (4)′

dGsi/Z< 4.6 (4)″

It is preferable that the zoom lens systems according to the embodiments satisfy the condition:

0.7 <|r 4 F/fw|< 1.0 (5)

(here, Z>2.5 and r 4 F<0)

where the second lens unit G 2 comprises only a cemented lens element, in order from the object side, having a positive lens element, a negative lens element and a positive lens element, which are cemented with each other, and where r 4 F is a radius of curvature of the object side surface of the negative lens element, and fw is a focal length of the zoom lens system at the wide-angle limit.

When the middle lens element in the cemented lens element having three elements is a negative lens element, the Condition (5) defines a condition that should be satisfied on the object side surface of the negative lens element. It is not preferable that the value exceeds the upper limit. When the value exceeds the upper limit, positive power on the cementing surface between the object side positive lens element and the negative lens element will be too small, and therefore, it is difficult to correct coma aberration in the second lens unit by other lenses in a well-balanced manner. On the other hand, it is not preferable that the value exceeds the lower limit. When the value exceeds the lower limit, the positive power on the cementing surface between the object side positive lens element and the negative lens element will be too large, and therefore, it is difficult to correct spherical aberration in the second lens unit by other lenses in a well-balanced manner.

When the following ranges are additionally defined for the Condition (5), the above effect can be further enhanced.

0.75 <|r 4 F/fw| (5)′

| r 4 F/fw|< 0.95 (5)″

It is preferable that the zoom lens systems according to the embodiments satisfy the condition:

0.60< |r 4 R/fw|< 85 (6)

(here, Z>2.5)

where the second lens unit G 2 comprises only a cemented lens element, in order from the object side, having a positive lens element, a negative lens element and a positive lens element, which are cemented with each other, and where r4R is a radius of curvature of the image side surface of the negative lens element, and fw is a focal length of the zoom lens system at the wide-angle limit.

When the middle lens element in the cemented lens element having three elements is a negative lens element, the Condition (6) defines a condition that should be satisfied on the image side surface of the negative lens element. It is not preferable that the value exceeds the upper limit. When the value exceeds the upper limit, negative power on the cementing surface between the negative lens element and the image side positive lens element will be too small, and therefore, it is difficult to correct spherical aberration and astigmatism in the second lens unit by other lenses in a well-balanced manner. On the other hand, it is not preferable that the value exceeds the lower limit. When the value exceeds the lower limit, the negative power on the cementing surface between the negative lens element and the image side positive lens element will be too large, and therefore, it is difficult to correct coma aberration and astigmatism in the second lens unit by other lenses in a well-balanced manner.

When the following ranges are additionally defined for the Condition (6), the above effect can be further enhanced.

0.65 <|r 4 R/fw| (6)′

| r 4 R/fw|< 0.80 (6)″

While the lens units in the embodiments comprise only refractive type lenses that deflect the incident light ray by refraction (that is, lenses of a type in which the incident light ray is deflected at the interface between media having different refractive indexes), the present invention is not limited thereto. For example, the lens units may comprise diffractive type lenses that deflect the incident light ray by diffraction, refractive-diffractive hybrid lenses that deflect the incident light ray by a combination of diffraction and refraction, or gradient index lenses that deflect the incident light ray by refractive index distribution in the medium.

Moreover, in the embodiments, the optical path may be bent in front of, behind or in the middle of the zoom lens system by disposing a reflecting surface on the optical path. The position of the bend may be determined as required, and by appropriate bending of the optical path, reduction in the apparent thickness of a camera can be achieved.

Furthermore, in the embodiments, a plate including an optical low-pass filter disposed between the last surface of the zoom lens system and the image sensor is shown. As the low-pass filter, for example, there can be applicable a birefringent low-pass filter made of, for example, a crystal in which a predetermined crystal orientation is adjusted, or a phase low-pass filter that achieves required optical cut-off frequency characteristic by diffraction effect.

As described above, the zoom lens system, in order from the object side, comprises the first lens unit having negative power, the second lens unit having positive power and the third lens unit having positive power; and the first lens unit comprises one negative lens element and one positive lens element, the second lens unit comprises a cemented lens element having set of positive lens element, negative lens element and positive lens element, and the third lens unit comprises one positive lens element; and magnification is varied from the wide-angle limit to the telephoto limit with change in intervals between each lens unit. Thus, it is possible to obtain a zoom lens system having the viewing angle of about 65° at the wide-angle limit and the zoom ratio of about 3×, which has fewer lens elements and therefore, can be retracted into a small form when not in use.

›Embodiment 5

FIG. 9 is a schematic construction view of a digital still camera according to Embodiment 5. Referring to FIG. 9 , the digital still camera comprises an imaging device comprising a zoom lens system 1 and a solid-state image sensor 2 which is a CCD; a liquid crystal monitor 3 ; a body 4 ; and the like. As the zoom lens system 1 , the zoom lens system according to Embodiment 1 is used. Referring to FIG. 9 , the zoom lens system 1 comprises the first lens unit G 1 , the second lens unit G 2 , the diaphragm A and the third lens unit G 3 . In the body 4 , the zoom lens system 1 is disposed on the front side, and the solid-state image sensor 2 which is a CCD is disposed behind the zoom lens system 1 . In the rear of the body 4 , the liquid crystal monotor 3 is disposed. An optical image of the subject by the zoom lens system 1 is formed on the imaging surface S.

A lens barrel comprises a main barrel 5 , a movable barrel 6 and a cylindrical cam 7 . When the cylindrical cam 7 is rotated, the first lens unit G 1 , the second lens unit G 2 and the third lens unit G 3 are moved to a predetermined position relative to the solid-state image sensor 2 , whereby the magnification can be varied from the wide-angle limit to the telephoto limit. The third lens unit G 3 can be moved in the direction of the optical axis by a motor for focus adjustment.

Thus, by using the zoom lens system according to Embodiment 1 in a digital still camera, it is possible to provide a digital still camera having the zoom ratio of about 3×, the viewing angle of about 65° at the wide-angle limit, high resolution and a small depth when not in use. For the digital still camera shown in FIG. 9 , any of the zoom lens systems according to Embodiments 2 to 4 may be used instead of the zoom lens system according to Embodiment 1. The optical system of the digital still camera shown in FIG. 9 may be used for digital video cameras intended for moving images. In this case, not only still images but also moving images with high resolution can be taken.

›EXAMPLES

Numerical examples which are concrete implementations of the zoom lens systems according to Embodiments 1 to 4 will be described. In the numerical examples, the units of the length in the tables are all given in mm. Moreover, in the numerical examples, r is the radius of curvature, d is the axial distance, nd is the refractive index to the d-line, and νd is the Abbe number.

In the numerical examples, the surfaces marked with * are aspherical surfaces, and the aspherical surface configuration is defined by the following expression:

Herein, κ is the conic coefficient, D, E, F, G, H, I and J are fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order and sixteenth-order aspherical coefficients, respectively.

›Examples4

›Example 1

A zoom lens system of Example 1 corresponds to Embodiment 1 shown in FIGS. 1A to 1C . The lens data of the zoom lens system of Example 1 is shown in Table 1, the aspherical data is shown in Table 2, and the focal length, the F-number, the viewing angle, the total optical length and the variable axial distance data when the shooting distance is ∞ are shown in Table 3.

›Example 2

A zoom lens system of Example 2 corresponds to Embodiment 2 shown FIGS. 3A to 3C . The lens data of the zoom lens system of Example 2 is shown in Table 4, the aspherical data is shown in Table 5, and the focal length, the F-number, the viewing angle, the total optical length and the variable axial distance data when the shooting distance is ∞ are shown in Table 6.

›Example 3

A zoom lens system of Example 3 corresponds to Embodiment 3 shown FIGS. 5A to 5C . The lens data of the zoom lens system of Example 3 is shown in Table 7, the aspherical data is shown in Table 8, and the focal length, the F-number, the viewing angle, the total optical length and the variable axial distance data when the shooting distance is ∞ are shown in Table 9.

›Example 4

A zoom lens system of Example 4 corresponds to Embodiment 4 shown in FIGS. 7A to 7C . The lens data of the zoom lens system of Example 4 is shown in Table 10, the aspherical data is shown in Table 11, and the focal length, the F-number, the viewing angle, the total optical length and the variable axial distance data when the shooting distance is ∞ are shown in Table 12.

The corresponding values of the Conditions in Examples 1 to 4 are shown in the following Table 13.

FIGS. 2A to 2I are aberration graphics of the zoom lens system according to Example 1 . FIGS. 4A to 4I are aberration graphics of the zoom lens system according to Example 2. FIGS. 6A to 6I are aberration graphics of the zoom lens system according to Example 3. FIGS. 8A to 8I are aberration graphics of the zoom lens system according to Example 4.

FIGS. 2A to 2C , 4 A to 4 C, 6 A to 6 C and 8 A to 8 C show aberrations at the wide-angle limit. FIGS. 2D to 2F , 4 D to 4 F, 6 D to 6 F and 8 D to 8 F show aberrations at the middle position. FIGS. 2G to 2I , 4 G to 4 I, 6 G to 6 I and 8 G to 8 I show aberrations at the telephoto limit. FIGS. 2A , 2 D, 2 G, 4 A, 4 D, 4 G, 6 A, 6 D, 6 G, 8 A, 8 D and 8 G show spherical aberration. FIGS. 2B , 2 E, 2 H, 4 B, 4 E, 4 H, 6 B, 6 E, 6 H, 8 B, 8 E and 8 H show astigmatism. FIGS. 2C , 2 F, 2 I, 4 C, 4 F, 4 I, 6 C, 6 F, 6 I, 8 C, 8 F and 8 I show distortion. In the graphic representations of spherical aberration, the vertical axis represents the F-number, the solid line represents the characteristic to d-line, the short dash line represents the characteristic to F-line, and the long dash line represents the characteristic to C-line. In the graphic representations of astigmatism, the vertical axis represents the half view angle, the solid line represents the characteristic on the sagittal plane, and the dash line represents the characteristic on the meridional plane. In the graphic representations of distortion, the vertical axis represents the half view angle.

Although the present invention has been described in detail, the foregoing description is in all aspects illustrative and not restrictive. It is understood that various modifications and changes can be devised without departing from the scope of the present invention.

›Tables in the description — 13

TABLE 1

Lens unit	Lens	Surface	r	d	nd	νd
G1	L1	1	49.160	1.500	1.80431	40.9
		2	5.848*	1.500
	L2	3	9.403	1.800	1.84666	23.8
		4	26.468	Variable
Diaphragm	5	∞	0.900
G2	L3	6	4.968*	2.350	1.80431	40.9
	L4	7	−5.46	0.500	1.71736	29.5
	L5	8	4.002	0.900	1.66547	55.2
		9	5.329*	Variable
G3	L6	10	16.627*	1.350	1.66547	55.2
		11	−41.093*	Variable
P	12	∞	2.040	1.51680	64.2
	13	∞

TABLE 2 — Sur-

face	κ	D	E	F
2	−9.77657E−01	2.28982E−04	5.23582E−06	−1.40910E−07
6	−8.00021E−01	6.95507E−04	5.28765E−05	−8.58817E−06
9	0.00000E+00	3.02252E−03	4.48490E−04	−6.95340E−05
10	0.00000E+00	−2.64986E−04	3.68409E−05	−6.13395E−06
11	0.00000E+00	−3.99524E−05	−1.19838E−05	0.00000E+00
	Surface	G	H	I
	2	1.75832E−09	0.00000E+00	0.00000E+00
	6	5.02626E−07	0.00000E+00	0.00000E+00
	9	9.47521E−06	0.00000E+00	0.00000E+00
	10	4.94345E−07	−2.20630E−08	4.04724E−10
	11	0.00000E+00	0.00000E+00	0.00000E+00

TABLE 3

Axial	Wide-angle	Middle	Telephoto
distance	limit	position	limit
d4	16.617	6.290	1.446
d9	3.623	7.346	15.861
d11	3.693	3.809	2.014
f	5.96	10.05	17.33
F	2.88	3.58	5.14
2ω	63.07	39.57	23.21
L	37.362	30.874	32.751

TABLE 4

Lens unit	Lens	Surface	r	d	nd	νd
G1	L1	1	120.896	1.500	1.80431	40.9
		2	6.000*	1.433
	L2	3	9.566	2.000	1.80518	25.5
		4	39.207	Variable
Diaphragm	5	∞	0.900
G2	L3	6	4.953*	2.350	1.80431	40.9
	L4	7	−4.806	0.500	1.71736	29.5
	L5	8	4.633	1.000	1.66547	55.2
		9	5.037*	Variable
G3	L6	10	21.222*	1.300	1.60602	57.4
		11	−22.956*	Variable
P	12	∞	2.040	1.51680	64.2
	13	∞

TABLE 5 — Sur-

face	κ	D	E	F
2	−1.02419E−01	−3.66050E−04	5.76483E−07	−2.78154E−07
6	−9.23698E−01	7.55352E−04	2.63999E−05	−3.27990E−06
9	0.00000E+00	3.34594E−03	2.52795E−04	0.00000E+00
10	0.00000E+00	−2.05546E−04	2.02553E−04	−4.01632E−05
11	0.00000E+00	2.51552E−04	8.76993E−05	−1.98769E−05
Sur-
face	G	H	I	J
2	−8.64232E−09	5.03171E−10	−9.58343E−12	−3.38616E−14
6	0.00000E+00	0.00000E+00	0.00000E+00	0.00000E+00
9	0.00000E+00	0.00000E+00	0.00000E+00	0.00000E+00
10	2.85595E−06	−7.82626E−08	0.00000E+00	0.00000E+00
11	1.12546E−06	−4.69895E−08	3.35774E−09	−1.29542E−10

TABLE 6

Axial	Wide-angle	Middle	Telephoto
distance	limit	position	limit
d4	16.901	7.331	1.619
d9	3.859	7.678	15.865
d11	3.559	3.358	1.502
f	5.98	9.74	17.30
F	2.87	3.56	5.14
2ω	63.09	40.54	23.21
L	37.932	31.980	32.599

TABLE 7

Lens unit	Lens	Surface	r	d	nd	νd
G1	L1	1	53.500	1.500	1.80431	40.9
		2	5.807*	1.500
	L2	3	9.487	1.800	1.84666	23.8
		4	27.52	Variable
Diaphragm	5	∞	0.900
G2	L3	6	5.031*	2.350	1.80431	40.9
	L4	7	−5.088	0.500	1.69895	30.0
	L5	8	3.876	0.900	1.60602	57.4
		9	5.41*	Variable
G3	L6	10	24.154*	1.600	1.66547	55.2
		11	−29.807*	Variable
P	12	∞	2.040	1.51680	64.2
	13	∞

TABLE 8 — Sur-

face	κ	D	E	F
2	−1.00818E+00	2.47026E−04	4.70180E−06	−1.25469E−07
6	−8.98118E−01	6.71516E−04	4.52410E−05	−9.63004E−06
9	0.00000E+00	3.06701E−03	3.60221E−04	−2.91776E−05
10	0.00000E+00	−3.51348E−04	2.95595E−05	−6.84761E−06
11	0.00000E+00	−1.06774E−04	−1.66481E−05	0.00000E+00
	Surface	G	H	I
	2	1.58935E−09	0.00000E+00	0.00000E+00
	6	5.83782E−07	0.00000E+00	0.00000E+00
	9	2.00545E−06	0.00000E+00	0.00000E+00
	10	6.66102E−07	−3.56669E−08	7.75914E−10
	11	0.00000E+00	0.00000E+00	0.00000E+00

TABLE 9

Axial	Wide-angle	Middle	Telephoto
distance	limit	position	limit
d4	16.562	6.242	1.422
d9	3.230	6.729	15.400
d11	3.921	4.102	2.011
f	5.96	10.05	17.34
F	2.89	3.57	5.11
2ω	63.17	38.15	23.10
L	37.893	31.252	33.013

TABLE 10

Lens unit	Lens	Surface	r	d	nd	νd
G1	L1	1	53.511	1.500	1.80431	40.9
		2	5.806*	1.500
	L2	3	9.507	1.800	1.84666	23.8
		4	27.675	Variable
Diaphragm	5	∞	0.900
G2	L3	6	5.03*	2.350	1.80431	40.9
	L4	7	−5.078	0.500	1.69895	30.0
	L5	8	3.875	0.900	1.60602	57.4
		9	5.413*	Variable
G3	L6	10	23.79*	1.500	1.66547	55.2
		11	−30.771*	Variable
P	12	∞	2.040	1.51680	64.2
	13	∞

TABLE 11 — Sur-

face	κ	D	E	F
2	−1.00722E+00	2.47566E−04	4.57964E−06	−1.24877E−07
6	−8.98696E−01	6.70963E−04	4.50742E−05	−9.61013E−06
9	0.00000E+00	3.07029E−03	3.63863E−04	−2.99534E−05
10	0.00000E+00	−3.51882E−04	2.95360E−05	−6.84730E−06
11	0.00000E+00	−1.06993E−04	−1.66862E−05	0.00000E+00
	Surface	G	H	I
	2	1.63209E−09	8.59814E−15	−1.06852E−14
	6	5.80743E−07	0.00000E+00	0.00000E+00
	9	1.92812E−06	0.00000E+00	0.00000E+00
	10	6.65408E−07	−3.57054E−08	7.79628E−10
	11	0.00000E+00	0.00000E+00	0.00000E+00

TABLE 12

Axial	Wide-angle	Middle	Telephoto
distance	limit	position	limit
d4	16.744	6.256	1.418
d9	3.189	6.728	15.409
d11	3.962	4.135	2.036
f	5.90	10.03	17.33
F	2.89	3.58	5.13
2ω	63.60	39.46	23.00
L	37.475	30.698	32.442

TABLE 13 — Example

Condition	1	2	3	4
nd4	1.71736	1.71736	1.69895	1.69895
νd4	29.5	29.5	30.0	30.0
\|fL4\|/fG2	0.264	0.271	0.263	0.264
d G1	4.800	4.933	4.800	4.800
d G2	3.750	3.850	4.650	4.650
d G3	1.350	1.300	1.600	1.500
d Gsi	9.900	10.083	11.050	10.950
d Gsi /Z	3.406	3.484	3.795	3.731
\|r4F/fw\|	0.916	0.804	0.854	0.860
\|r4R/fw\|	0.671	0.775	0.651	0.656

Claims as granted

21 claims

Classifications

11 codes

IPC · International Patent Classification

Section G — Physics

G02B15/14
G02B15/177
G02B9/12

Section H — Electricity

H04N23/58
H04N23/55

USPC · US Patent Classification

359/689359/754359/784396/79359/695353/101

Claim changes

Soon

Coming soonHow the claims changed between publication and grant

See which claims were amended, added or cancelled during examination, with every added and removed word marked.

AmendedAddedCancelledUnchanged

The published claims of this application are not paired with the granted ones in what we hold.

File wrapper

⤢ drag to zoom

USPTOApplicanthover for detail · click to open

Pendency

2.6 y

938 days filing → grant

Office actions

non-final + final

Responses

1 RCE

Examiner

Ricky Mack

art unit 2873 · TC 2800

Law firm

Law firm · Log in to unlock

Citations: 22 back · 3 forward

See the full prosecution history — every USPTO and applicant action on this file, in order.

Documents

Log in to open the documents of this file: the application as filed, every office action and response, the notice of allowance.

Chain of title

⤢ drag to zoom

Titlehover for detail · click to open

See the full assignment history — every owner this patent has passed through, with recordation dates and reel/frame numbers.