Wide-angle imaging lens

The application is the U.S. national phase of PCT Application No. PCT/CN2015/094329 filed on Nov. 11, 2015, which claims a priority to and benefits of Chinese Patent Applications No. 201510233355.X, filed with the State Intellectual Property Office of P. R. China on May 8, 2015, the entire contents of which are incorporated herein by reference.

The present disclosure relates to an imaging technology, in particularly to a wide-angle imaging lens.

With the developments in technology, portable electronic products are more and more popular, especially those with a camera function. A photosensitive unit of a common optical system includes a charge-coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS). With the improvements in the technology of a semiconductor manufacture process, the photosensitive unit is of an increasing smaller pixel size. Correspondingly, it requires a smaller image lens adapted for the photosensitive unit and guaranteeing high imaging quality at the same time. In the past, the imaging quality is commonly improved by adding lenses, which is, however, adversely affects miniaturization of the imaging lens. In addition, the field angle is narrowed for improving the imaging quality, which is also adversely affects a wide-angle feature of the imaging lens.

Embodiments of the present disclosure seek to solve at least one of the problems existing in the related art.

A wide-angle imaging lens according to the present disclosure includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side of the wide-angle imaging lens to an image side of the wide-angle imaging lens in turn, wherein

the first lens is of a focal power, an object side surface of the first lens close to an axis is concave;

the second lens is of a focal power, an image side surface of the second lens is concave;

the third lens is of a positive focal power, an image side surface of the third lens is convex;

the fourth lens is of a negative focal power, an object side surface of the fourth lens is concave and in a meniscus shape;

the fifth lens is of a focal power, an object side surface of the fifth lens close to the axis is convex, and at least one inflection point is present in at least one of the object side surface and an image side surface of the fifth lens; and

the wide-angle imaging lens meets the following formulas:

TTL /Img H< 1.7; and

−1.4< f/f 4<0,

wherein TTL is a total length of the wide-angle imaging lens,

ImgH equals to half of a diameter of an effective pixel region at an imaging side surface,

f represents an effective focal length of the wide-angle imaging lens, and

f 4 represents an effective focal length of the fourth lens.

In some embodiments, the wide-angle imaging lens includes an aperture stop arranged between the second lens and the third lens.

In some embodiments, the wide-angle imaging lens meets the following formula:

25< V 1− V 2<45,

wherein V 1 represents a dispersion coefficient of the first lens and V 2 represents a dispersion coefficient of the second lens.

In some embodiments, the wide-angle imaging lens meets the following formula:

0 <Drlr 4/ TTL< 0.25,

wherein Drlr 4 represents a distance from the object side surface of the first lens to the image side surface of the second lens along the axial direction, and

TTL is the total length of the wide-angle imaging lens.

In some embodiments, the wide-angle imaging lens meets the following formula:

| SAG 41 /SD 41|≥0.56,

wherein SAG 41 is a vector height of the object side surface of the fourth lens, and

SD 41 is a maximal effective radius of the object side surface of the fourth lens.

In some embodiments, the wide-angle imaging lens meets the following formula:

tan( HFOV )/ TTL> 0.32 mm −1 ,

wherein HFOV is half of a maximal field angle of the wide-angle imaging lens, and

TTL is the total length of the wide-angle imaging lens.

In some embodiments, the fifth lens is of a positive focal power, and an image side surface of the fifth lens close to the axis is concave.

In some embodiments, an object side surface of the second lens is convex.

In some embodiments, an image side surface of the first lens close to the axis is convex.

In some embodiments, an object side surface of the third lens is convex.

Additional aspects and advantages of embodiments of present disclosure will be given in part in the following descriptions, become apparent in part from the following descriptions, or be learned from the practice of the embodiments of the present disclosure.

These and other aspects and advantages of embodiments of the present disclosure will become apparent and more readily appreciated from the following descriptions made with reference to the drawings, in which:

FIG. 1 is a schematic view showing the wide-angle imaging lens according to Example 1 of the present disclosure;

FIG. 2 is a diagram showing a longitudinal aberration curve (mm) of the wide-angle imaging lens in Example 1;

FIG. 3 is a diagram showing an astigmatism curve (mm) of the wide-angle imaging lens in Example 1;

FIG. 4 is a diagram showing a distortion curve (%) of the wide-angle imaging lens in Example 1;

FIG. 5 is a diagram showing a lateral color curve (μm) of the wide-angle imaging lens in Example 1;

FIG. 6 is a schematic view showing the wide-angle imaging lens according to Example 2 of the present disclosure;

FIG. 7 is a diagram showing a longitudinal aberration curve (mm) of the wide-angle imaging lens in Example 2;

FIG. 8 is a diagram showing an astigmatism curve (mm) of the wide-angle imaging lens in Example 2;

FIG. 9 is a diagram showing a distortion curve (%) of the wide-angle imaging lens in Example 2;

FIG. 10 is a diagram showing a lateral color curve (μm) of the wide-angle imaging lens in Example 2;

FIG. 11 is a schematic view showing the wide-angle imaging lens according to Example 3 of the present disclosure;

FIG. 12 is a diagram showing a longitudinal aberration curve (mm) of the wide-angle imaging lens in Example 3;

FIG. 13 is a diagram showing an astigmatism curve (mm) of the wide-angle imaging lens in Example 3;

FIG. 14 is a diagram showing a distortion curve (%) of the wide-angle imaging lens in Example 3;

FIG. 15 is a diagram showing a lateral color curve (μm) of the wide-angle imaging lens in Example 3;

FIG. 16 is a schematic view showing the wide-angle imaging lens according to Example 4 of the present disclosure;

FIG. 17 is a diagram showing a longitudinal aberration curve (mm) of the wide-angle imaging lens in Example 4;

FIG. 18 is a diagram showing an astigmatism curve (mm) of the wide-angle imaging lens in Example 4;

FIG. 19 is a diagram showing a distortion curve (%) of the wide-angle imaging lens in Example 4;

FIG. 20 is a diagram showing a lateral color curve (μm) of the wide-angle imaging lens in Example 4;

FIG. 21 is a schematic view showing the wide-angle imaging lens according to Example 5 of the present disclosure;

FIG. 22 is a diagram showing a longitudinal aberration curve (mm) of the wide-angle imaging lens in Example 5;

FIG. 23 is a diagram showing an astigmatism curve (mm) of the wide-angle imaging lens in Example 5;

FIG. 24 is a diagram showing a distortion curve (%) of the wide-angle imaging lens in Example 5;

FIG. 25 is a diagram showing a lateral color curve (μm) of the wide-angle imaging lens in Example 5;

FIG. 26 is a schematic view showing the wide-angle imaging lens according to Example 6 of the present disclosure;

FIG. 27 is a diagram showing a longitudinal aberration curve (mm) of the wide-angle imaging lens in Example 6;

FIG. 28 is a diagram showing an astigmatism curve (mm) of the wide-angle imaging lens in Example 6;

FIG. 29 is a diagram showing a distortion curve (%) of the wide-angle imaging lens in Example 6;

FIG. 30 is a diagram showing a lateral color curve (μm) of the wide-angle imaging lens in Example 6;

FIG. 31 is a schematic view showing the wide-angle imaging lens according to Example 7 of the present disclosure;

FIG. 32 is a diagram showing a longitudinal aberration curve (mm) of the wide-angle imaging lens in Example 7;

FIG. 33 is a diagram showing an astigmatism curve (mm) of the wide-angle imaging lens in Example 7;

FIG. 34 is a diagram showing a distortion curve (%) of the wide-angle imaging lens in Example 7;

FIG. 35 is a diagram showing a lateral color curve (μm) of the wide-angle imaging lens in Example 7;

FIG. 36 is a schematic view showing the wide-angle imaging lens according to Example 8 of the present disclosure;

FIG. 37 is a diagram showing a longitudinal aberration curve (mm) of the wide-angle imaging lens in Example 8;

FIG. 38 is a diagram showing an astigmatism curve (mm) of the wide-angle imaging lens in Example 8;

FIG. 39 is a diagram showing a distortion curve (%) of the wide-angle imaging lens in Example 8;

FIG. 40 is a diagram showing a lateral color curve (μm) of the wide-angle imaging lens in Example 8;

FIG. 41 is a schematic view showing the wide-angle imaging lens according to Example 9 of the present disclosure;

FIG. 42 is a diagram showing a longitudinal aberration curve (mm) of the wide-angle imaging lens in Example 9;

FIG. 43 is a diagram showing an astigmatism curve (mm) of the wide-angle imaging lens in Example 9;

FIG. 44 is a diagram showing a distortion curve (%) of the wide-angle imaging lens in Example 9;

FIG. 45 is a diagram showing a lateral color curve (μm) of the wide-angle imaging lens in Example 9;

FIG. 46 is a schematic view showing the wide-angle imaging lens according to Example 10 of the present disclosure;

FIG. 47 is a diagram showing a longitudinal aberration curve (mm) of the wide-angle imaging lens in Example 10;

FIG. 48 is a diagram showing an astigmatism curve (mm) of the wide-angle imaging lens in Example 10;

FIG. 49 is a diagram showing a distortion curve (%) of the wide-angle imaging lens in Example 10; and

FIG. 50 is a diagram showing a lateral color curve (μm) of the wide-angle imaging lens in Example 10.

Embodiments of the present disclosure will be described in detail in the following descriptions, examples of which are shown in the accompanying drawings, in which the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout the descriptions. The embodiments described hereinafter with reference to the accompanying drawings are explanatory and illustrative, which are used to generally understand the present disclosure, but shall not be construed to limit the present invention.

In the description of the present disclosure, it shall be appreciated that, terms “first”, “second” are just used herein for purposes of description and are not intended to indicate or imply relative importance or significance or to imply the number of indicated technical features. Thus, the feature defined with “first” and “second” may explicitly or implicitly include one or more this feature. In the description of the present disclosure, unless specified otherwise, “a plurality of” means two or more than two.

In the description of the present disclosure, it should be noted that, unless otherwise clearly defined and limited, the terms “mounted,” “connected”, “connection” should be broadly understood, and may be, for example, fixed connections, detachable connections, or integral connections; may also be electrical connections or may communicate with each other; may also be direct connections or indirect connections via intermediation; may also be inner communications or interaction relationship of two elements, which can be understood by those ordinary skilled in the art according to specific situations.

Various embodiments and examples are provided in the following descriptions to implement different structures of the present disclosure. In order to simplify the present disclosure, certain elements and settings will be described. However, these elements and settings are only by way of example and are not intended to limit the present disclosure. In addition, reference numerals and/or reference letters may be repeated in different examples in the present disclosure, this repeating is for the purpose of simplification and clarity and does not refer to relations between different embodiments and/or settings. Furthermore, examples of specific processes and materials are provided in the present disclosure, however, it would be appreciated by those ordinary skilled in the art that other processes and/or materials may be also applied.

With reference to FIG. 1 , in an embodiment of the present disclosure, a wide-angle imaging lens includes a first lens E 1 , a second lens E 2 , a third lens E 3 , a fourth lens E 4 and a fifth lens E 5 from an object side of the wide-angle imaging lens to an image side of the wide-angle imaging lens in turn. The first lens E 1 is of a focal power, the second lens E 2 is of a focal power, the third lens E 3 is of a positive focal power, the fourth lens E 4 is of a negative focal power, and the fifth lens E 5 is of a focal power. Specifically, the first lens E 1 includes an object side surface S 1 and an image side surface S 2 . The second lens E 2 includes an object side surface S 3 and an image side surface S 4 . The third lens E 3 includes an object side surface S 5 and an image side surface S 6 . The forth lens E 4 includes an object side surface S 7 and an image side surface S 8 . The fifth lens E 5 includes an object side surface S 9 and an image side surface S 10 .

When imaging, light entering from the object side of the wide-angle imaging lens and passing through a filter E 6 including an object side surface S 11 and an image side surface S 12 is imaged at an imaging side surface S 13 .

In some embodiments, the object side surface S 1 close to an axis is concave, the image side surface S 4 is concave, the image side surface S 6 is convex, the object side surface S 7 is concave and in a meniscus shape, the object side surface S 9 close to the axis is convex, and at least one inflection point is present in at least one of the object side surface S 9 and the image side surface S 10 .

The wide-angle imaging lens meets the following formulas:

TTL /Img H< 1.7; and

−1.4< f/f 4<0,

in which TTL is a total length of the wide-angle imaging lens, ImgH equals to half of a diameter of an effective pixel region at an imaging side surface, f represents an effective focal length of the wide-angle imaging lens, and f 4 represents an effective focal length of the fourth lens.

The above formula is satisfied to shorten the total length of the wide-angle imaging lens, ensure the miniaturization and the wide-angle feature of the wide-angle imaging lens, and improve the imaging quality of the wide-angle imaging lens.

The wide-angle imaging lens includes an aperture stop STO arranged between the second lens E 2 and the third lens E 3 .

The wide-angle imaging lens meets the following formula:

25< V 1− V 2<45,

in which V 1 represents a dispersion coefficient of the first lens and V 2 represents a dispersion coefficient of the second lens.

The above formula is satisfied to enlarge the field angle of the wide-angle imaging lens and ensure the wide-angle feature of the wide-angle imaging lens.

The wide-angle imaging lens meets the following formula:

0 <Drlr 4/ TTL< 0.25,

in which Drlr 4 represents a distance from the object side surface S 1 to the image side surface S 4 .

The above formula is satisfied to be beneficial to the miniaturization of the wide-angle imaging lens.

The wide-angle imaging lens meets the following formula:

| SAG 41/ SD 41|≥0.56,

in which SAG 41 is a vector height of the object side surface S 9 , and SD 41 is a maximal effective radius of the object side surface S 9 .

The above formula is satisfied to enlarge the field angle of the wide-angle imaging lens.

The wide-angle imaging lens meets the following formula:

tan( HFOV )/ TTL> 0.32 mm −1 ,

in which HFOV is half of a maximal field angle of the wide-angle imaging lens.

The above formula is satisfied to ensure the wide-angle imaging lens both the wide-angle feature and the miniaturization.

In some embodiments, the fifth lens E 5 is of a positive focal power, and the image side surface S 10 close to the axis is concave.

In some embodiments, the object side surface S 3 is convex.

In some embodiments, the image side surface S 2 close to the axis is convex.

In some embodiments, the object side surface S 5 is convex.

The above requirements to the focal power and shape of the lens are satisfied to ensure the wide-angle feature of the wide-angle imaging lens, and at the same time further improve the imaging quality and reduce the total length of the wide-angle imaging lens.

In some embodiments, each of the first lens E 1 , the second lens E 2 , the third lens E 3 , the fourth lens E 4 and the fifth lens E 5 may be aspheric shape lenses.

A surface shape of the aspheric shape is defined by a formula as follows:

in which h is a height from any point on the aspheric shape to an optical axis, c is an apex curvature, k is a conic coefficient, Ai is a coefficient for the i-th order of the aspheric.

In example 1, the wide-angle imaging lens meets the conditions of the following tables:

Furthermore, f 1 =−9.79 mm; f 2 =11.88 mm; f 3 =−1.51 mm; f 4 =−2.25 mm; f 5 =2.74 mm and f=1.93 mm; HFOV=50.0°; TTL=3.37 mm; Fno is: 2.4.

In example 2, the wide-angle imaging lens meets the conditions of the following tables:

Furthermore, f 1 =−66.2 mm; f 2 =−192.3 mm; f 3 =1.43 mm; f 4 =−1.57 mm; f 5 =2.15 mm and f=1.96 mm; HFOV=52.3°; TTL=3.63 mm; Fno is: 2.4.

In example 3, the wide-angle imaging lens meets the conditions of the following tables:

Furthermore, f 1 =−15.2 mm; f 2 =17.33 mm; f 3 =1.38 mm; f 4 =−1.75 mm; f 5 =2.58 mm and f=1.94 mm; HFOV=52.6°; TTL=3.68 mm; Fno is: 2.4.

In example 4, the wide-angle imaging lens meets the conditions of the following tables:

Furthermore, f 1 =−9.09 mm; f 2 =5.26 mm; f 3 =1.52 mm; f 4 =−3.47 mm; f 5 =6.18 mm and f=1.62 mm; HFOV=50.2°; TTL=2.76 mm; Fno is: 2.4.

In example 5, the wide-angle imaging lens meets the conditions of the following tables:

Furthermore, f 1 =−9.01 mm; f 2 =6.65 mm; f 3 =1.58 mm; f 4 =−3.39 mm; f 5 =3.29 mm and f=1.67 mm; HFOV=50.1°; TTL=3.14 mm; Fno is: 2.4.

In example 6, the wide-angle imaging lens meets the conditions of the following tables:

Furthermore, f 1 =−5.52 mm; f 2 =5.72 mm; f 3 =1.33 mm; f 4 =−2.33 mm; f 5 =2.41 mm and f=1.64 mm; HFOV=50.1°; TTL=3.36 mm; Fno is: 2.4.

In example 7, the wide-angle imaging lens meets the conditions of the following tables:

Furthermore, f 1 =26.89 mm; f 2 =−4.68 mm; f 3 =1.29 mm; f 4 =−1.44 mm; f 5 =1.6 mm and f=1.67 mm; HFOV=50.4°; TTL=3.29 mm; Fno is: 2.4.

In example 8, the wide-angle imaging lens meets the conditions of the following tables:

Furthermore, f 1 =8.91 mm; f 2 =−7.21 mm; f 3 =1.26 mm; f 4 =−4.48 mm; f 5 =−389.8 mm and f=1.87 mm; HFOV=50.4°; TTL=3.17 mm; Fno is: 2.4.

In example 9, the wide-angle imaging lens meets the conditions of the following tables:

Furthermore, f 1 =−3.47 mm; f 2 =3.53 mm; f 3 =1.35 mm; f 4 =−4.11 mm; f 5 =5.29 mm and f=1.51 mm; HFOV=51.2°; TTL=3.08 mm; Fno is: 2.4.

In example 10, the wide-angle imaging lens meets the conditions of the following tables:

Furthermore, f 1 =−184.7 mm; f 2 =93.58 mm; f 3 =1.4 mm; f 4 =−2.11 mm; f 5 =3.29 mm and f=1.94 mm; HFOV=51.5°; TTL=3.62 mm; Fno is: 2.4.

In examples 1 to 10, each formula meets the conditions of the following tables:

Although explanatory embodiments of the present invention have been shown and described, it would be appreciated by those ordinary skilled in the art that various changes, modifications, alternatives and variants can be made in these embodiments without departing from principles and spirits of the present invention, and the scope of the present invention is restricted by claims and their equivalents.