CN113253419A

CN113253419A - Camera module, electronic device and automobile

Info

Publication number: CN113253419A
Application number: CN202010090171.3A
Authority: CN
Inventors: 蔡雄宇; 兰宾利; 周芮
Original assignee: Tianjin OFilm Opto Electronics Co Ltd
Current assignee: Tianjin OFilm Opto Electronics Co Ltd
Priority date: 2020-02-13
Filing date: 2020-02-13
Publication date: 2021-08-13

Abstract

The invention relates to a camera module, an electronic device and an automobile. The camera module comprises from an object side to an image side: the image side surface of the first lens element with negative refractive power is concave; a second lens element with negative refractive power having a concave image-side surface; a third lens element with positive refractive power; a fourth lens element with positive refractive power; a fifth lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a sixth lens element with negative refractive power having a concave object-side surface; and a diaphragm disposed on an object side of the fourth lens; the camera module satisfies the relation: 0 is less than or equal to Ym/[ (1/2) FOVm P is less than or equal to 26; ym is half of the image height corresponding to the m-degree angle of view of the camera module in the horizontal direction, FOvm is the m-degree angle of view of the camera module in the horizontal direction, and P is the size of the unit pixel on the photosensitive element. The camera module has enough high pixel and imaging analysis capability in the whole field of view, thereby providing excellent imaging effect for the system.

Description

Camera module, electronic device and automobile

Technical Field

The invention relates to the field of optical imaging, in particular to a camera module, an electronic device and an automobile.

Background

With the development of the vehicle-mounted industry, the technical requirements of users on vehicle-mounted cameras such as forward looking cameras, automatic cruising cameras, automobile data recorders and back-up images are higher and higher. The front-view camera is a vehicle-mounted camera arranged in front of the vehicle, can be used as a camera system in an advanced driver assistance system to analyze video content and provide Lane Departure Warning (LDW), automatic Lane Keeping Assistance (LKA), high beam/low beam control and Traffic Sign Recognition (TSR); when the device is used for parking, the device is opened, so that obstacles in front of a vehicle can be seen visually, and the parking is more convenient; the front-view camera is opened at any time when the automobile passes through a special place (such as a road block, a parking lot and the like), the driving environment is judged, and a correct instruction is given by feeding back an automobile central system to avoid driving accidents.

However, the existing forward-looking camera lens is difficult to simultaneously meet shooting and clear imaging in a large angle range, so that early warning is difficult to accurately make in real time, and further, the driving risk is caused.

Disclosure of Invention

Therefore, it is necessary to provide a camera module, an electronic device and an automobile for meeting the requirements of large viewing angle and clear imaging.

A camera module sequentially comprises from an object side to an image side:

the lens comprises a first lens element with negative refractive power, a second lens element with negative refractive power and a third lens element with negative refractive power, wherein the image side surface of the first lens element is concave;

the second lens element with negative refractive power has a concave image-side surface;

a third lens element with positive refractive power;

a fourth lens element with positive refractive power;

a fifth lens element with positive refractive power having a convex object-side surface and a convex image-side surface;

a sixth lens element with negative refractive power having a concave object-side surface;

the camera module further comprises a diaphragm, and the diaphragm is arranged at the object side of the fourth lens;

and the camera module satisfies the following relations:

0≤Ym/[(1/2)FOVm*P]≤26；

the image height of the camera module corresponds to an m-degree angle of view in the horizontal direction is half of Ym, the unit of Ym is mm, m is more than 0 and less than or equal to 100, FOvm is the m-degree angle of view of the camera module in the horizontal direction, and P is the size of a unit pixel on the photosensitive element.

When the camera module meets the structural conditions of each lens, the camera module is favorable for maintaining good imaging quality while having a large visual field range, and when the above relation is met, the number of pixels corresponding to each degree of visual field angle of the system can be reasonably adjusted by the camera module, so that while having a large visual field shooting range, the number of pixels on the photosensitive surface corresponding to each degree of visual field is enough to realize clear imaging of the module, the camera module has enough high pixels and imaging analysis capability in the whole visual field, and a good imaging effect is provided for the system.

In one embodiment, the camera module satisfies the following relationship:

21≤Y₁₀/[(1/2)FOV10*P]≤26；

wherein, Y₁₀Is half of the image height corresponding to the 10-degree field angle of the camera module in the horizontal direction, Y₁₀Is mm, and the FOV10 is the 10 ° field angle of the camera module in the horizontal direction.

When the relation is met, the number of pixels corresponding to each degree of field angle in the central field range of the system (within +/-5 degrees of field angle in the horizontal direction, namely within 10 degrees of field angle in the horizontal direction) can be reasonably distributed, so that the system has high enough pixels and imaging analysis capability in the central field range, important information in the field center can be clearly highlighted, meanwhile, the characteristics of small field and long focus can be embodied in the central field range, the long-distance shooting details are clearly displayed, and an excellent imaging effect is provided for the system.

In one embodiment, the camera module satisfies the following relationship:

20≤(Y₅₀-Y₁₀)/[(1/2)(FOV50-FOV10)*P]≤26；

wherein, Y₅₀Is half of the image height corresponding to the 50-degree field angle of the camera module in the horizontal direction, Y₁₀Is half of the image height corresponding to the 10-degree field angle of the camera module in the horizontal direction, Y₁₀And Y₅₀The units of (a) and (b) are all mm, the FOV50 is a 50 ° angle of view of the camera module in the horizontal direction, and the FOV10 is a 10 ° angle of view of the camera module in the horizontal direction.

When the relation is satisfied, the pixel number corresponding to each degree of field angle in the field angle range of the system adjacent to the center (namely the range from the field angle of +/-5 degrees to the field angle of +/-25 degrees in the horizontal direction) can be reasonably distributed, so that the system has high enough pixels and imaging analysis capability in the field area adjacent to the center field angle, thereby clearly highlighting important information adjacent to the center of the field angle and providing excellent imaging effect for the system.

In one embodiment, the camera module satisfies the following relationship:

9≤(Y₁₀₀-Y₅₀)/[(1/2)(FOV100-FOV50)*P]≤20；

wherein, Y₁₀₀Is half of the image height corresponding to the 100-degree field angle of the camera module in the horizontal direction, Y₅₀The FOV100 is a half of the image height corresponding to the 50 ° field angle of the camera module in the horizontal direction, the FOV50 is a 100 ° field angle of the camera module in the horizontal direction, and the FOV50 is a 50 ° field angle of the camera module in the horizontal direction.

When the relation is met, the number of pixels corresponding to each degree of field angle in the marginal field range of the system (namely the range from the field angle of +/-25 degrees to the maximum field angle in the horizontal direction) can be reasonably distributed, so that the system has high enough pixel and imaging analysis capability in the marginal field range, the system can clearly image in the wide-angle marginal field, and meanwhile, the characteristic of wide large-field shooting range is reflected in the marginal field range, and a better imaging effect is provided for the system.

In one embodiment, the camera module satisfies the following relationship:

6＜D34*100/TTL＜16；

d34 is a distance on an optical axis from an image side surface of the third lens element to an object side surface of the fourth lens element, and TTL is a total optical length of the camera module. When the relation is satisfied, the pupil is filled with light rays entering the system, the brightness and the definition of an imaging surface are enhanced, and the total length of the system is shortened, so that the system has the characteristics of compact structure and miniaturization.

In one embodiment, the camera module satisfies the following relationship:

3.0<f/tan(HFOV)<4.2；

wherein f is the effective focal length of the camera module, HFOV is half of the maximum field angle of the camera module in the horizontal direction, and the unit of f is mm.

When the above relation is satisfied, a sufficient field angle of the system can be provided to satisfy the requirement of the electronic product for a large viewing angle.

In one embodiment, the camera module satisfies the following relationship:

f/EPD≤1.7；

wherein f is the effective focal length of the camera module, and EPD is the entrance pupil diameter of the camera module. When the relation is satisfied, the imaging of the system image surface can be brighter, the system has the effect of a large aperture and a larger depth of field range, namely a wider imaging depth, and a user or a using system can accurately identify and judge the imaging picture from far to near.

In one embodiment, the camera module satisfies the following relationship:

-5<f1/f<0；

wherein f1 is the focal length of the first lens, and f is the effective focal length of the camera module. The first lens provides negative refractive power for the system, and when the relation is satisfied, the first lens can capture light rays emitted into the system from a large angle, so that the field of view of the camera module can be enlarged, and the system has the characteristics of low sensitivity and miniaturization.

In one embodiment, the camera module satisfies the following relationship:

-5＜f2/f＜-1；

wherein f2 is the focal length of the second lens, and f is the effective focal length of the camera module. The second lens provides negative refractive power for the system, and when the relationship is met, the width of light rays is increased, so that the light rays which are incident from a large angle and are refracted by the first lens and the second lens are widened and fill the pupil, the light rays are fully transmitted to a high-pixel imaging surface, a wider field range is obtained, and the characteristic of high pixels of the system is reflected.

In one embodiment, the camera module satisfies the following relationship:

3.0≤D23/(1/|R2r|-1/|R3f|)＜5.0；

wherein D23 is a distance on an optical axis between an image-side surface of the second lens element and an object-side surface of the third lens element, R2R is a radius of curvature of the image-side surface of the second lens element on the optical axis, and R3f is a radius of curvature of the object-side surface of the third lens element on the optical axis. When the relation is satisfied, the angle of the main ray of the peripheral field of view incident on the imaging surface of the system can be reduced, the probability of generating ghost images is reduced, and the generation of astigmatism is easily inhibited.

In one embodiment, the camera module satisfies the following relationship:

2＜f3/f＜5；

wherein f3 is the focal length of the third lens, and f is the effective focal length of the camera module. Because the incident light is refracted and emitted by the first lens element and the second lens element with negative refractive power, a larger curvature of field is easily generated when the marginal light enters the image plane, and when the relationship is satisfied, the third lens element has proper positive refractive power to facilitate the correction of marginal aberration and improve the imaging resolution.

In one embodiment, the camera module satisfies the following relationship:

0.3＜(D46-D13)/f<1.5；

wherein D13 is a distance between an object-side surface of the first lens element and an image-side surface of the third lens element on an optical axis, D46 is a distance between an object-side surface of the fourth lens element and an image-side surface of the sixth lens element on the optical axis, and f is an effective focal length of the image capturing module. When the relation is satisfied, the aberration of the system is favorably corrected, the imaging resolution is improved, the compact structure of the system is ensured, and the miniaturization characteristic is satisfied.

In one embodiment, the camera module satisfies the following relationship:

4＜f56/f<15；

wherein f56 is the combined focal length of the fifth lens and the sixth lens, and f is the effective focal length of the camera module. When the relationship is satisfied, the fifth lens element and the sixth lens element have proper positive refractive power integrally, so that system aberration can be corrected, eccentricity sensitivity can be reduced, and imaging resolution can be improved; meanwhile, the system assembly sensitivity can be reduced when the relation is met, and the difficulty of lens process manufacturing and lens assembly is reduced, so that the yield is improved.

In one embodiment, at least one of the object-side surface and the image-side surface of at least one of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens is aspheric. The aspheric surface design is beneficial to correcting system aberration and improving the imaging quality of the system.

In one embodiment, the image-side surface of the fifth lens is cemented with the object-side surface of the sixth lens. The fifth lens and the sixth lens form a cemented lens, so that the assembly sensitivity of the system can be effectively reduced, the difficulty in lens process manufacturing and lens assembly is reduced, and the yield is improved.

An electronic device comprises a shell and the camera module, wherein the camera module is arranged on the shell. Through adopting above-mentioned module of making a video recording, electron device all has sufficient pixel number in the field of view that corresponds every degree in order to realize the clear formation of image of module when having big visual angle shooting range, makes have high enough pixel and formation of image analytic ability in the whole field of view to make electron device has good formation of image effect.

An automobile comprises an automobile body and the electronic device, wherein the electronic device is arranged on the automobile body. By adopting the electronic device, the visual field blind area of a driver can be effectively reduced, the imaging picture quality is improved, the driver can obtain more road condition information of the periphery of the vehicle body, and the potential safety hazard of the vehicle during lane changing, parking, turning and other operations can be reduced.

Drawings

Fig. 1 is a schematic view of a camera module according to a first embodiment of the present application;

fig. 2 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the camera module in the first embodiment;

fig. 3 is a schematic view of a camera module according to a second embodiment of the present application;

fig. 4 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 5 is a schematic view of a camera module according to a third embodiment of the present application;

fig. 6 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 7 is a schematic view of a camera module according to a fourth embodiment of the present application;

fig. 8 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 9 is a schematic view of a camera module according to a fifth embodiment of the present application;

fig. 10 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 11 is a schematic view of a camera module according to a sixth embodiment of the present application;

fig. 12 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 13 is a schematic view of an electronic device according to an embodiment of the present application;

fig. 14 is a schematic view of an automobile according to an embodiment of the present application.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

With the development of the vehicle-mounted industry, the technical requirements of users on vehicle-mounted cameras such as forward looking cameras, automatic cruising cameras, automobile data recorders and back-up images are higher and higher. The front-view camera is a vehicle-mounted camera arranged in front of the vehicle, can be used as a camera system in an advanced driver assistance system to analyze video content and provide Lane Departure Warning (LDW), automatic Lane Keeping Assistance (LKA), high beam/low beam control and Traffic Sign Recognition (TSR); when the device is used for parking, the device is opened, so that obstacles in front of a vehicle can be seen visually, and the parking is more convenient; the front-view camera is opened at any time when the automobile passes through a special place (such as a road block, a parking lot and the like), the driving environment is judged, and a correct instruction is given by feeding back an automobile central system to avoid driving accidents. However, the existing forward-looking camera lens has low resolution and small depth of field range, and is difficult to simultaneously meet the requirements of shooting and clear imaging in a large-angle range, so that early warning is difficult to be accurately made in real time, and further, the driving risk is caused. Therefore, some embodiments of the present application provide a camera module, an electronic device and an automobile to solve the above problems.

Referring to fig. 1, in some embodiments of the present disclosure, the image capturing module 10 includes, in order from an object side to an image side, a first lens L1, a second lens L2, a third lens L3, a stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a photosensitive element 110. The first lens element L1 with negative refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with positive refractive power, the fifth lens element L5 with positive refractive power and the sixth lens element L6 with negative refractive power. The first lens L1 to the sixth lens L6 each include only one lens, and each lens in the camera module 10 is disposed coaxially with the stop STO, that is, the optical axis of each lens and the center of the stop STO are located on the same straight line, which may be referred to as the optical axis of the camera module 10. In other embodiments, the stop STO may be disposed at any reasonable position on the object side of the fourth lens L4 to control the throughput, spherical aberration caused by marginal rays, stray light, etc. of the system, for example, the stop STO may be disposed on the object side of the first lens L1, or between the first lens L1 and the second lens L2, or between the second lens L2 and the third lens L3. In addition, the photosensitive element 110 may be a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor).

The first lens L1 includes an object side surface S1 and an image side surface S2, the second lens L2 includes an object side surface S3 and an image side surface S4, the third lens L3 includes an object side surface S5 and an image side surface S6, the fourth lens L4 includes an object side surface S7 and an image side surface S8, the fifth lens L5 includes an object side surface S9 and an image side surface S10, and the sixth lens L6 includes an object side surface S11 and an image side surface S12. In addition, the image capturing module 10 further has an image forming surface S17, the image forming surface S17 is located on the image side of the sixth lens element L6, and the incident light can be formed on the image forming surface S17 after being adjusted by the lenses of the image capturing module 10, for convenience of understanding, the image forming surface S17 can be regarded as the photosensitive surface of the photosensitive element 110. The camera module 10 also has an object plane, and a subject located on the object plane can form a clear image on the image plane S17 of the camera module 10.

In the above embodiments, the object-side surface and the image-side surface of the first lens element L1 through the third lens element L3 are spherical; the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are both aspheric; the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are both spherical; the object-side surface S11 of the sixth lens element L6 is spherical, and the image-side surface S12 is aspheric. In addition, the image-side surface S10 of the fifth lens element L5 is cemented with the object-side surface S11 of the sixth lens element L6, so that the fifth lens element L5 and the sixth lens element L6 form a cemented lens, and the cemented lens is composed of the fifth lens element L5 and the sixth lens element L6, thereby effectively reducing the assembly sensitivity of the system, reducing the difficulty of lens fabrication and lens assembly, and improving the yield.

In some embodiments, an object-side surface and/or at least one image-side surface of at least one of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 is aspheric.

The aspheric surface shape can effectively help the camera module 10 to eliminate aberration, solves the problem of distortion of the field of view, and is also favorable for the miniaturization design of the camera module 10, so that the camera module 10 can simultaneously have excellent analysis effect on the premise of keeping the miniaturization design. Of course, in other embodiments, the object-side surface of any one of the first lens L1 through the sixth lens L6 may be a spherical surface or an aspherical surface; the image side surface of any one of the first lens element L1 to the sixth lens element L6 may be a spherical surface or an aspherical surface, and the aberration problem can be effectively eliminated by the cooperation of the spherical surface and the aspherical surface, so that the camera module 10 has an excellent imaging effect, and the flexibility of lens design and assembly is improved. In particular, when the sixth lens L6 is an aspheric lens, it is advantageous to perform final correction on the aberration generated by each lens in front, thereby improving the imaging quality. When at least one of the object-side surface and the image-side surface of the lens is aspheric, the lens may be referred to as an aspheric lens.

The surface shape of the aspheric surface can be calculated by referring to an aspheric surface formula:

wherein Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the surface vertex, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric surface vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspheric surface type formula.

On the other hand, in the above embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all made of glass. In some embodiments, the material of each lens in the camera module 10 is plastic. In other embodiments, the first lens L1 is made of glass, and the second lens L2 to the sixth lens L6 are made of plastic, at this time, since the lens located at the object side in the camera module 10 is made of glass, these glass lenses located at the object side have a good tolerance effect on extreme environments, and are not easily affected by the object side environment and are subject to aging, so that when the camera module 10 is in extreme environments such as exposure to high temperature, the structure can effectively avoid the camera module 10 from being degraded in imaging quality and reduced in service life. The plastic lens can reduce the weight of the camera module 10 and reduce the production cost, and the glass lens can endure higher temperature and has excellent optical performance. Of course, the material arrangement of the lenses in the image pickup module 10 is not limited to the above embodiment, and any one of the lenses may be plastic or glass.

In the above embodiment, the image capturing module 10 includes the filter L7, and the filter L7 is disposed on the image side of the fifth lens element L5. Filter L7 includes object side S13 and image side S14. The filter L7 may be an infrared cut filter, and at this time, the filter L7 is used to filter infrared light and prevent the infrared light from reaching the imaging surface S17, thereby preventing the infrared light from interfering with normal imaging. When the camera module 10 is used for an on-board device, the camera module 10 having an infrared cut-off function can be applied to an electronic device such as a vehicle event data recorder and a rear-view device. In addition, in some embodiments, the filter L7 may not be provided, and the filter function of filtering infrared light may be achieved by providing a filter plating layer on any one of the first lens L1 to the sixth lens L6. Accordingly, the optical filter L7 in some embodiments may also be an infrared band pass filter, in which case the optical filter L7 may be used to filter visible light through infrared light, the camera module 10 with the infrared band pass filter may be used as an identification module and applied to an electronic device together with a corresponding infrared emission module (such as TOF flight time or 3D structured light), and such camera module 10 may be specifically used to identify a facial contour, a pupil, a fingerprint, a palm print, or the like, or may also be used in a distance measuring device.

In some embodiments, the camera module 10 is provided with a protective glass L8 between the filter L7 and the photosensitive element 110, the protective glass L8 is used for protecting the photosensitive element 110, and the protective glass L8 includes an object side surface S15 and an image side surface S16.

In other embodiments, the first lens element L1 may also include two or more lens elements, where an object-side surface of the lens element closest to the object side is the object-side surface of the first lens element L1, and an image-side surface of the lens element closest to the image side is the image-side surface S2 of the first lens element L1. Accordingly, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 in some embodiments are not limited to the case of including only one lens.

In some embodiments, the image capturing module 10 further includes a mirror disposed on the object side of the first lens L1 for changing an incident light path, and the mirror may be a prism or a plane mirror, for example, so that the image capturing module 10 has a periscopic structure.

In some embodiments, the camera module 10 further satisfies the following relationships:

0≤Ym/[(1/2)FOVm*P]≤26；

where Ym is a half of the image height corresponding to the m-degree field angle of the image module 10 in the horizontal direction, Ym is mm, and m is greater than 0 and less than or equal to 100, FOVm is the m-degree field angle of the image module 10 in the horizontal direction, and P is the size of a unit pixel on the photosensitive element 110. Specifically, Ym/[ (1/2) FOVm × P ] can be 19, 20, 21, 22, 23, or 24, with the relational unit (Pixel/deg). A unit of Pixel can be understood as a Pixel cell.

Above-mentioned camera module 10 when satisfying the structural condition of each lens, be favorable to also keeping good formation of image quality when possessing big field of vision scope, and when satisfying above-mentioned relation, the number of pixels that every degree angle of vision of camera module 10 reasonable governing system corresponds, thereby when possessing big visual angle shooting scope, correspond the clear formation of image of the photosensitive surface interior enough number of pixels in order to realize the module of every degree visual field, make camera module 10 have high enough pixel and formation of image analysis ability in whole visual field, thereby provide better formation of image effect for the system. When the upper limit of the relational expression is exceeded, the number distribution of the pixels in the central view field of the pixel region is insufficient, and the imaging plane S17 cannot achieve sufficient resolution, which is not favorable for the telephoto characteristic of the central view field of the optical system, i.e., it is difficult to have a long-distance depth of field range.

21≤Y₁₀/[(1/2)FOV10*P]≤26；

Wherein, Y₁₀Is half of the image height corresponding to the 10 degree angle of view of the camera module 10 in the horizontal direction, Y₁₀Is mm, and the FOV10 is the 10 ° field angle of the camera module 10 in the horizontal direction. Specifically, Y₁₀/[(1/2)FOV10*P]May be 21(Pixel/deg), 22(Pixel/deg), 23(Pixel/deg) or 24 (Pixel/deg). When the relation is met, the number of pixels corresponding to each degree of field angle in the central field range of the system (within +/-5 degrees of field angle in the horizontal direction, namely within 10 degrees of field angle in the horizontal direction) can be reasonably distributed, so that the system has high enough pixel and imaging analysis capability in the central field range, important information in the field center can be clearly highlighted, meanwhile, the characteristics of small field and long focus can be embodied in the central field range, the long-distance shooting details are clearly displayed, and a better imaging effect is provided for the system. When the lower limit of the relational expression is exceeded, the pixel number distribution of the pixel region in the central view field is insufficient, and the imaging plane S17 cannot achieve sufficient resolution, which is not favorable for the telephoto characteristic of the central view field of the optical system, i.e., it is difficult to have the long-distance telephoto characteristicDepth of field range.

20≤(Y₅₀-Y₁₀)/[(1/2)(FOV50-FOV10)*P]≤26；

Wherein, Y₅₀Is half of the image height, Y, corresponding to the 50 degree angle of view of the camera module 10 in the horizontal direction₁₀Is half of the image height corresponding to the 10 degree angle of view of the camera module 10 in the horizontal direction, Y₁₀And Y₅₀The units of (a) and (b) are mm, the FOV50 is a 50 ° angle of view of the image pickup module 10 in the horizontal direction, and the FOV10 is a 10 ° angle of view of the image pickup module 10 in the horizontal direction. Specifically, (Y)₅₀-Y₁₀)/[(1/2)(FOV50-FOV10)*P]And may be 20(Pixel/deg), 21(Pixel/deg) or 22 (Pixel/deg). When the relation is satisfied, the pixel number corresponding to each degree of field angle in the field angle range of the system adjacent to the center (namely the field angle range from +/-5 degrees to +/-25 degrees in the horizontal direction) can be reasonably distributed, so that the system has high enough pixel and imaging analysis capability in the field area adjacent to the center field angle, thereby clearly highlighting important information adjacent to the center of the field angle and providing better imaging effect for the system. If the range of the relational expression is exceeded, it is difficult to achieve the technical effects within the above-mentioned range of the relational expression.

9≤(Y₁₀₀-Y₅₀)/[(1/2)(FOV100-FOV50)*P]≤20；

Wherein, Y₁₀₀Is half of the image height corresponding to the 100 degree angle of view of the camera module 10 in the horizontal direction, Y₅₀The FOV100 is half the image height corresponding to the 50 ° angle of view of the camera module 10 in the horizontal direction, the FOV50 is 100 ° angle of view of the camera module 10 in the horizontal direction, and the FOV50 is 50 ° angle of view of the camera module 10 in the horizontal direction. Specifically, (Y)₁₀₀-Y₅₀)/[(1/2)(FOV100-FOV50)*P]It may be 16(Pixel/deg), 17(Pixel/deg) or 18 (Pixel/deg). When the relation is satisfied, the pixel number corresponding to each degree of field angle in the marginal field angle range of the system (namely the range from the field angle of +/-25 degrees to the maximum field angle in the horizontal direction) can be reasonably distributed, so that the system has high enough pixel and imaging analysis capability in the marginal field angle range, the system can clearly image at the large-angle marginal field angle, and meanwhile, the marginal field angle area can clearly image at the large-angle marginal field angleThe characteristic of wide shooting range of the large field of view is reflected, and a better imaging effect is provided for the system. When the optical length is lower than the lower limit of the relational expression, the total optical length of the optical system 10 is too long, which is not beneficial to the miniaturization of the system; when the upper limit of the relational expression is exceeded, the distance between the front lens and the rear lens of the stop STO is too long, which is not beneficial to the stability of the stop STO position, thereby reducing the image surface brightness at the edge position of the optical system 10 and influencing the edge analysis.

6＜D34*100/TTL＜16；

D34 is the distance on the optical axis from the image-side surface S6 of the third lens element L3 to the object-side surface S7 of the fourth lens element L4, and TTL is the total optical length of the camera module 10. Specifically, D34 × 100/TTL may be 6.80, 7.00, 7.50, 8.00, 9.00, 11.00, 13.00, 14.00, 14.50, 15.00, or 15.40. When the above relation is satisfied, the pupil is filled with the light rays entering the system, the brightness and the definition of the imaging surface S17 are enhanced, and the total length of the system is shortened, so that the system has the characteristics of compact structure and miniaturization. If the upper limit of the relation is exceeded, the widening of the optical system 10 is not facilitated; when the value is lower than the lower limit of the relational expression, the optical system 10 may generate a large distortion, which is not favorable for the consistency of the imaging and the object photographing of the optical system 10.

3.0<f/tan(HFOV)<4.2；

Where f is the effective focal length of the camera module 10, the HFOV is half of the maximum field angle of the camera module 10 in the horizontal direction, and the unit of f is mm. Specifically, f/tan (hfov) may be 3.10mm, 3.15mm, 3.20mm, 3.30mm, 3.35mm, 3.40mm or 3.45 mm. When the above relation is satisfied, a sufficient field angle of the system can be provided to satisfy the requirement of the electronic product for a large viewing angle.

f/EPD≤1.7；

Where f is the effective focal length of the camera module 10, and EPD is the entrance pupil diameter of the camera module 10. Specifically, the f/EPD may be 1.60 or 1.61. When the relation is satisfied, the imaging of the system image surface can be brighter, the system has the effect of a large aperture and a larger depth of field range, namely a wider imaging depth, and a user or a using system can accurately identify and judge the imaging picture from far to near. If the range of the relational expression is exceeded, it is difficult to achieve the technical effects within the above-mentioned range of the relational expression.

-5<f1/f<0；

Wherein f1 is the focal length of the first lens L1, and f is the effective focal length of the camera module 10. Specifically, f1/f can be-4.20, -4.00, -3.50, -2.50, -2.00, -1.80, -1.60, or-1.50. The first lens element L1 provides negative refractive power to the system, and when the above relationship is satisfied, the first lens element L1 can capture light rays incident on the system from a large angle, so as to enlarge the field of view of the system, and at the same time, enable the system to have low sensitivity and small size. If the range of the relational expression is exceeded, it is difficult to achieve the technical effects within the above-mentioned range of the relational expression.

-5＜f2/f＜-1；

Wherein f2 is the focal length of the second lens L2, and f is the effective focal length of the camera module 10. Specifically, f2/f can be-4.50, -4.30, -4.00, -3.00, -2.00, -1.80, -1.60, or-1.50. The second lens element L2 provides negative refractive power to the system, and when the above relationship is satisfied, it is beneficial to increase the light width, so that the light rays incident from a large angle and refracted by the first lens element L1 and the second lens element L2 are widened and fill the pupil, and the light rays are fully transmitted to the high pixel imaging surface S17, thereby obtaining a wider field range, and being beneficial to embodying the characteristics of high pixels of the system. If the range of the relational expression is exceeded, it is difficult to achieve the technical effects within the above-mentioned range of the relational expression.

3.0≤D23/(1/|R2r|-1/|R3f|)＜5.0；

D23 is the distance on the optical axis between the image-side surface S4 of the second lens element L2 and the object-side surface S5 of the third lens element L3, R2R is the radius of curvature of the image-side surface S4 of the second lens element L2 on the optical axis, and R3f is the radius of curvature of the object-side surface S5 of the third lens element L3 on the optical axis. Specifically, D23/(1/| R2R | -1/| R3f |) may be 3.20, 3.40, 3.80, 4.00, 4.20, 4.40, or 4.50. When the above relationship is satisfied, the angle at which the principal ray of the peripheral field of view enters the system image plane S17 can be reduced, the probability of generating ghost images can be reduced, and the occurrence of astigmatism can be easily suppressed. When the upper limit of the relation is exceeded, the distance between the second lens L2 and the third lens L3 is too large, which is not favorable for the direct bearing of the second lens L2 and the third lens L3, and additional assembling mechanical parts are required, and is also not favorable for tolerance sensitivity, thereby reducing the production yield and increasing the production cost; when the difference between the image-side surface S4 of the second lens element L2 and the object-side surface S5 of the third lens element L3 is too large, the image-side surface S4 of the second lens element L2 is easily bent, and the object-side surface S5 of the third lens element L3 tends to be gentle, so that the light reflected by the image-side surface S6 of the third lens element L3 is reflected by the object-side surface S3 of the second lens element L2 and converges to the image-forming surface S17 to generate a strong ghost image, which is not favorable for improving the image quality.

2＜f3/f＜5；

Where f3 is the focal length of the third lens L3, and f is the effective focal length of the camera module 10. Specifically, f3/f can be 2.50, 2.70, 3.00, 3.50, 4.00, 4.10, or 4.30. Since the incident light is refracted and emitted through the first lens element L1 and the second lens element L2 with negative refractive power, the edge light is likely to generate a larger curvature of field when entering the image plane, and when the above relationship is satisfied, the third lens element L3 has a proper positive refractive power to facilitate correction of the edge aberration and improve the imaging resolution. When the range of the relationship is exceeded, the focal length of the third lens L3 is insufficient to correct the curvature of field of the optical system 10, so that the optical system 10 is over-corrected or under-corrected, and the imaging resolution performance of the optical system 10 is reduced.

0.3＜(D46-D13)/f<1.5；

D13 is the distance on the optical axis between the object-side surface S1 of the first lens element L1 and the image-side surface S6 of the third lens element L3, D46 is the distance on the optical axis between the object-side surface S7 of the fourth lens element L4 and the image-side surface S12 of the sixth lens element L6, and f is the effective focal length of the camera module 10. Specifically, (D46-D13)/f can be 1.15, 1.20, 1.25, 1.28, 1.30, or 1.35. When the relation is satisfied, the aberration of the system is favorably corrected, the imaging resolution is improved, the compact structure of the system is ensured, and the miniaturization characteristic is satisfied.

4＜f56/f<15；

Where f56 is the combined focal length of the fifth lens L5 and the sixth lens L6, and f is the effective focal length of the camera module 10. Specifically, f56/f can be 5.50, 6.00, 7.00, 9.00, 10.00, 11.00, 12.00, 12.50, or 13.00. When the above relationship is satisfied, the fifth lens element L5 and the sixth lens element L6 have proper positive refractive power as a whole, which is beneficial to correcting system aberration, reducing eccentricity sensitivity, and improving imaging resolution; meanwhile, the system assembly sensitivity can be reduced when the relation is met, and the difficulty of lens process manufacturing and lens assembly is reduced, so that the yield is improved. When the upper limit of the relationship is exceeded, the combined focal length of the fifth lens element L5 and the sixth lens element L6 is too long to provide sufficient refractive power, which is not favorable for aberration correction of the optical system 10; when the effective focal length is lower than the lower limit of the relational expression, the effective focal length of the optical system 10 is large, which is not favorable for the wide-angle design of the system.

The image pickup module 10 of the present application will be described below with reference to more specific embodiments:

first embodiment

Referring to fig. 1 and 2, in the first embodiment, the image capturing module 10 includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a stop STO, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with positive refractive power, and a sixth lens element L6 with negative refractive power. Fig. 2 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the camera module 10 according to the first embodiment, wherein the astigmatism diagram and the distortion diagram are graphs of d-light-587.56 nm wavelength. In the following embodiments, the ordinate of the astigmatism diagram and the distortion diagram represents half of the maximum field angle of the imaging module 10 in the horizontal direction.

The object-side surface S1 of the first lens element L1 is concave, and the image-side surface S2 is concave.

The object-side surface S3 of the second lens element L2 is concave, and the image-side surface S4 is concave.

The object-side surface S5 of the third lens element L3 is convex, and the image-side surface S6 is concave.

The object-side surface S7 of the fourth lens element L4 is convex, and the image-side surface S8 is convex.

The object-side surface S9 of the fifth lens element L5 is convex, and the image-side surface S10 is convex.

The object-side surface S11 of the sixth lens element L6 is concave, and the image-side surface S12 is concave.

The object-side surface and the image-side surface of the first lens element L1 through the third lens element L3 are spherical surfaces; the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are both aspheric; the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are both spherical; the object-side surface S11 of the sixth lens element L6 is spherical, and the image-side surface S12 is aspheric. In addition, the image-side surface S10 of the fifth lens element L5 is cemented with the object-side surface S11 of the sixth lens element L6, so that the fifth lens element L5 and the sixth lens element L6 form a cemented lens, and the cemented lens is composed of the fifth lens element L5 and the sixth lens element L6, thereby effectively reducing the assembly sensitivity of the system, reducing the difficulty of lens fabrication and lens assembly, and improving the yield. Through the spherical and aspherical surface types of each lens in the camera module 10, the problems of aberration, distortion of field of view and the like of the camera module 10 can be effectively solved, and the imaging quality is improved.

The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all made of glass. At this time, since the glass lens has excellent optical characteristics, it is favorable for improving the imaging quality of the camera module 10, and the glass lens is not easy to age, and can still maintain excellent optical performance in a high-temperature or low-temperature environment, so that the glass lens is suitable for being applied to the vehicle-mounted camera equipment and is suitable for being arranged outside the vehicle body.

A filter L7 for filtering infrared light is further disposed between the sixth lens L6 and the photosensitive element 110.

In the first embodiment, the camera module 10 satisfies the following relationships:

0 is less than or equal to Ym/[ (1/2) FOVm P is less than or equal to 26; where Ym is a half of the image height corresponding to the m-degree field angle of the image module 10 in the horizontal direction, Ym is mm, and m is greater than 0 and less than or equal to 100, FOVm is the m-degree field angle of the image module 10 in the horizontal direction, and P is the size of a unit pixel on the photosensitive element 110.

In this embodiment and the following detailed embodiments, the unit pixel has a square structure, and the size P of the unit pixel is 3 μm, which may also be referred to as the size of each pixel unit being 3 μm.

The average pixel count per field angle is listed below for m 20, 40, 60, 80, and 100:

Y₂₀/[(1/2)FOV20*P]＝23.87(Pixel/deg)；

Y₄₀/[(1/2)FOV40*P]＝23.23(Pixel/deg)；

Y₆₀/[(1/2)FOV60*P]＝22.19(Pixel/deg)；

Y₈₀/[(1/2)FOV80*P]＝20.81(Pixel/deg)；

Y₁₀₀/[(1/2)FOV100*P]＝19.20(Pixel/deg)；

above-mentioned camera module 10 when satisfying the structural condition of each lens, be favorable to also keeping good formation of image quality when possessing big field of vision scope, and when satisfying above-mentioned relation, the number of pixels that every degree angle of vision of camera module 10 reasonable governing system corresponds, thereby when possessing big visual angle shooting scope, correspond the clear formation of image of the photosensitive surface interior enough number of pixels in order to realize the module of every degree visual field, make camera module 10 have high enough pixel and formation of image analysis ability in whole visual field, thereby provide better formation of image effect for the system.

Y₁₀/[(1/2)FOV10*P]24 (Pixel/deg); wherein, Y₁₀Is half of the image height corresponding to the 10 degree angle of view of the camera module 10 in the horizontal direction, Y₁₀Is mm, and the FOV10 is the 10 ° field angle of the camera module 10 in the horizontal direction. When the relation is met, the number of pixels corresponding to each degree of field angle in the central field range of the system (within +/-5 degrees of field angle in the horizontal direction, namely within 10 degrees of field angle in the horizontal direction) can be reasonably distributed, so that the system has high enough pixel and imaging analysis capability in the central field range, important information in the field center can be clearly highlighted, meanwhile, the characteristics of small field and long focus can be embodied in the central field range, the long-distance shooting details are clearly displayed, and a better imaging effect is provided for the system.

(Y₅₀-Y₁₀)/[(1/2)(FOV50-FOV10)*P]22 (Pixel/deg); wherein, Y₅₀Is half of the image height, Y, corresponding to the 50 degree angle of view of the camera module 10 in the horizontal direction₁₀Is half of the image height corresponding to the 10 degree angle of view of the camera module 10 in the horizontal direction, Y₁₀And Y₅₀The units of (a) and (b) are mm, the FOV50 is a 50 ° angle of view of the image pickup module 10 in the horizontal direction, and the FOV10 is a 10 ° angle of view of the image pickup module 10 in the horizontal direction. When the relation is satisfied, the pixel number corresponding to each degree of field angle in the field angle range of the system adjacent to the center (namely the field angle range from +/-5 degrees to +/-25 degrees in the horizontal direction) can be reasonably distributed, so that the system has high enough pixel and imaging analysis capability in the field area adjacent to the center field angle, thereby clearly highlighting important information adjacent to the center of the field angle and providing better imaging effect for the system.

(Y₁₀₀-Y₅₀)/[(1/2)(FOV100-FOV50)*P]16 (Pixel/deg); wherein, Y₁₀₀Is half of the image height corresponding to the 100 degree angle of view of the camera module 10 in the horizontal direction, Y₅₀The FOV100 is half the image height corresponding to the 50 ° angle of view of the camera module 10 in the horizontal direction, the FOV50 is 100 ° angle of view of the camera module 10 in the horizontal direction, and the FOV50 is 50 ° angle of view of the camera module 10 in the horizontal direction. When the relation is met, the number of pixels corresponding to each degree of field angle in the marginal field range of the system (namely the range from the field angle of +/-25 degrees to the maximum field angle in the horizontal direction) can be reasonably distributed, so that the system has high enough pixel and imaging analysis capability in the marginal field range, the system can clearly image in the wide-angle marginal field, and meanwhile, the characteristic of wide large-field shooting range is reflected in the marginal field range, and a better imaging effect is provided for the system.

D34 × 100/TTL 7.64; d34 is the distance on the optical axis from the image-side surface S6 of the third lens element L3 to the object-side surface S7 of the fourth lens element L4, and TTL is the total optical length of the camera module 10. When the above relation is satisfied, the pupil is filled with the light rays entering the system, the brightness and the definition of the imaging surface S17 are enhanced, and the total length of the system is shortened, so that the system has the characteristics of compact structure and miniaturization.

f/tan (HFOV) is 3.48, where f is the effective focal length of the image pickup module 10, HFOV is half of the maximum angle of view of the image pickup module 10 in the horizontal direction, and f is expressed in mm. When the above relation is satisfied, a sufficient field angle of the system can be provided to satisfy the requirement of the electronic product for a large viewing angle.

f/EPD is 1.61; where f is the effective focal length of the camera module 10, and EPD is the entrance pupil diameter of the camera module 10. When the relation is satisfied, the imaging of the system image surface can be brighter, the system has the effect of a large aperture and a larger depth of field range, namely a wider imaging depth, and a user or a using system can accurately identify and judge the imaging picture from far to near.

f 1/f-4.39; wherein f1 is the focal length of the first lens L1, and f is the effective focal length of the camera module 10. The first lens element L1 provides negative refractive power to the system, and when the above relationship is satisfied, the first lens element L1 can capture light rays incident on the system from a large angle, so as to enlarge the field of view of the system, and at the same time, enable the system to have low sensitivity and small size.

f 2/f-1.41; wherein f2 is the focal length of the second lens L2, and f is the effective focal length of the camera module 10. The second lens element L2 provides negative refractive power to the system, and when the above relationship is satisfied, it is beneficial to increase the light width, so that the light rays incident from a large angle and refracted by the first lens element L1 and the second lens element L2 are widened and fill the pupil, and the light rays are fully transmitted to the high pixel imaging surface S17, thereby obtaining a wider field range, and being beneficial to embodying the characteristics of high pixels of the system.

D23/(1/| R2R | -1/| R3f |) -3.08; d23 is the distance on the optical axis between the image-side surface S4 of the second lens element L2 and the object-side surface S5 of the third lens element L3, R2R is the radius of curvature of the image-side surface S4 of the second lens element L2 on the optical axis, and R3f is the radius of curvature of the object-side surface S5 of the third lens element L3 on the optical axis. When the above relationship is satisfied, the angle at which the principal ray of the peripheral field of view enters the system image plane S17 can be reduced, the probability of generating ghost images can be reduced, and the occurrence of astigmatism can be easily suppressed.

f3/f 2.43; where f3 is the focal length of the third lens L3, and f is the effective focal length of the camera module 10. Since the incident light is refracted and emitted through the first lens element L1 and the second lens element L2 with negative refractive power, the edge light is likely to generate a larger curvature of field when entering the image plane, and when the above relationship is satisfied, the third lens element L3 has a proper positive refractive power to facilitate correction of the edge aberration and improve the imaging resolution.

(D46-D13)/f ═ 1.10; d13 is the distance on the optical axis between the object-side surface S1 of the first lens element L1 and the image-side surface S6 of the third lens element L3, D46 is the distance on the optical axis between the object-side surface S7 of the fourth lens element L4 and the image-side surface S12 of the sixth lens element L6, and f is the effective focal length of the camera module 10. When the relation is satisfied, the aberration of the system is favorably corrected, the imaging resolution is improved, the compact structure of the system is ensured, and the miniaturization characteristic is satisfied.

f56/f is 8.15; where f56 is the combined focal length of the fifth lens L5 and the sixth lens L6, and f is the effective focal length of the camera module 10. When the above relationship is satisfied, the fifth lens element L5 and the sixth lens element L6 have proper positive refractive power as a whole, which is beneficial to correcting system aberration, reducing eccentricity sensitivity, and improving imaging resolution; meanwhile, the system assembly sensitivity can be reduced when the relation is met, and the difficulty of lens process manufacturing and lens assembly is reduced, so that the yield is improved.

Above-mentioned module 10 of making a video recording all has sufficient pixel number in order to realize the clear formation of image of module in the sensitization surface of every degree visual field when possessing big visual angle shooting range, makes module 10 of making a video recording have high enough pixel and formation of image analytic ability in whole visual field to provide better formation of image effect for the system.

In addition, each lens parameter of the image pickup module 10 is given by table 1 and table 2, where K in table 2 is a conical coefficient, and Ai is a coefficient corresponding to the i-th high-order term in the aspherical surface type formula. The elements from the object plane to the image plane (image plane S17) are sequentially arranged in the order of the elements from top to bottom in table 1, wherein the object located on the object plane can form a clear image on the image plane S17 of the camera module 10.

Surface numbers

1 and 2 respectively indicate an object-side surface S1 and an image-side surface S2 of the first lens L1, that is, a surface having a smaller surface number is an object-side surface and a surface having a larger surface number is an image-side surface in the same lens. The Y radius in table 1 is the radius of curvature of the object-side or image-side surface at the paraxial (or understood to be on the optical axis) of the corresponding surface number. The first value of the lens in the "thickness" parameter set is the thickness of the lens on the optical axis, and the second value is the distance from the image-side surface of the lens to the object-side surface of the next lens on the optical axis. The optical axes of the lenses in the embodiment of the present application are on the same straight line, and the straight line is used as the optical axis of the camera module 10. The "thickness" parameter value in the surface number 12 is the distance on the optical axis from the image-side surface S12 of the sixth lens L6 to the object-side surface S13 of the filter L7. The "thickness" parameter value corresponding to the surface number 20 of the protective glass L8 is the distance on the optical axis from the image side surface S16 of the protective glass L8 to the image surface (image surface S17) of the camera module 10.

In the first embodiment, the effective focal length f of the camera module 10 is 4.15mm, the f-number FNO is 1.61, the maximum field angle FOV in the horizontal direction is 100 °, half of the maximum field angle HFOV in the horizontal direction is 50 °, the total optical length TTL is 24.00mm, and the total optical length TTL is the distance from the object-side surface S1 of the first lens L1 to the image plane S17 of the camera module 10 on the optical axis.

In the following examples (first, second, third, fourth, fifth, and sixth examples), the refractive index, abbe number, and focal length of each lens were all values at a wavelength of 587.56 nm. In addition, the relational expression calculation and the lens structure of each example are based on lens parameters (e.g., table 1, table 2, table 3, table 4, etc.).

TABLE 1

TABLE 2

Second embodiment

Referring to fig. 3 and 4, in the second embodiment, the image capturing module 10 includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a stop STO, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with positive refractive power, and a sixth lens element L6 with negative refractive power. Fig. 4 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the camera module 10 according to the second embodiment, wherein the astigmatism diagram and the distortion diagram are graphs of d-light-587.56 nm wavelength.

The object-side surface S11 of the sixth lens element L6 is concave, and the image-side surface S12 is convex.

In addition, the fifth lens L5 and the sixth lens L6 form a cemented lens.

In addition, the lens parameters of the camera module 10 in the second embodiment are shown in tables 3 and 4, wherein the definitions of the structures and parameters can be obtained from the first embodiment, which is not repeated herein.

TABLE 3

TABLE 4

The camera module 10 of this embodiment satisfies the following relationship:

third embodiment

Referring to fig. 5 and 6, in the third embodiment, the image capturing module 10 includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a stop STO, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with positive refractive power, and a sixth lens element L6 with negative refractive power. Fig. 6 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the camera module 10 according to the third embodiment, where the astigmatism diagram and the distortion diagram are graphs of d-light-587.56 nm wavelength.

The object-side surface S3 of the second lens element L2 is convex, and the image-side surface S4 is concave.

In addition, the fifth lens L5 and the sixth lens L6 form a cemented lens.

In addition, the lens parameters of the camera module 10 in the third embodiment are shown in tables 5 and 6, wherein the definitions of the structures and parameters can be obtained from the first embodiment, which is not repeated herein.

TABLE 5

TABLE 6

The camera module 10 of this embodiment satisfies the following relationship:

fourth embodiment

Referring to fig. 7 and 8, in the fourth embodiment, the image capturing module 10 includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a stop STO, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with positive refractive power, and a sixth lens element L6 with negative refractive power. Fig. 8 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the camera module 10 according to the fourth embodiment, where the astigmatism diagram and the distortion diagram are graphs of d-light-587.56 nm wavelength.

In addition, the fifth lens L5 and the sixth lens L6 form a cemented lens.

In addition, the lens parameters of the camera module 10 in the fourth embodiment are shown in tables 7 and 8, wherein the definitions of the structures and parameters can be obtained from the first embodiment, which is not described herein again.

TABLE 7

TABLE 8

The camera module 10 of this embodiment satisfies the following relationship:

fifth embodiment

Referring to fig. 9 and 10, in the fifth embodiment, the image capturing module 10 includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a stop STO, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with positive refractive power, and a sixth lens element L6 with negative refractive power. Fig. 10 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the camera module 10 according to the fifth embodiment, where the astigmatism diagram and the distortion diagram are graphs of d-light-587.56 nm wavelength.

In addition, the fifth lens L5 and the sixth lens L6 form a cemented lens.

In addition, the lens parameters of the camera module 10 in the fifth embodiment are given in tables 9 and 10, wherein the definitions of the structures and parameters can be obtained from the first embodiment, which is not described herein again.

TABLE 9

Watch 10

The camera module 10 of this embodiment satisfies the following relationship:

sixth embodiment

Referring to fig. 11 and 12, in the sixth embodiment, the image capturing module 10 includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a stop STO, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with positive refractive power, and a sixth lens element L6 with negative refractive power. Fig. 12 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the camera module 10 according to the sixth embodiment, where the astigmatism diagram and the distortion diagram are graphs of d-light-587.56 nm wavelength.

The object-side surface S1 of the first lens element L1 is convex, and the image-side surface S2 is concave.

In addition, the fifth lens L5 and the sixth lens L6 form a cemented lens.

In addition, the lens parameters of the camera module 10 in the sixth embodiment are given in tables 11 and 12, wherein the definitions of the structures and parameters can be obtained from the first embodiment, which is not described herein again.

TABLE 11

TABLE 12

The camera module 10 of this embodiment satisfies the following relationship:

In some embodiments, the distance between the photosensitive element 110 and each lens (the first lens L1 to the sixth lens L6) is relatively fixed, and at this time, the image capturing module 10 is a fixed focus module. In other embodiments, a driving mechanism such as a voice coil motor may be provided to enable the photosensitive element 110 to move relative to each lens in the camera module 10, so as to achieve a focusing effect. Specifically, a coil electrically connected to the driving chip is disposed on the lens barrel where the above lenses are assembled, and the image pickup module 10 is further provided with a magnet, so that the lens barrel is driven to move relative to the photosensitive element 110 by a magnetic force between the energized coil and the magnet, thereby achieving a focusing effect. In other embodiments, a similar driving mechanism may be provided to drive a part of the lenses in the camera module 10 to move, so as to achieve an optical zoom effect.

Referring to fig. 13, some embodiments of the present application further provide an electronic device 20, and the camera module 10 is applied to the electronic device 20 to enable the electronic device 20 to have a camera function. Specifically, the electronic device 20 includes a housing 210, the camera module 10 is mounted on the housing 210, and the housing 210 may be a circuit board, a middle frame, or the like. The electronic device 20 may be, but is not limited to, a smart phone, a smart watch, an e-book reader, a vehicle-mounted camera, a monitoring device, a medical device (such as an endoscope), a tablet computer, a biometric device (such as a fingerprint recognition device or a pupil recognition device), a PDA (Personal Digital Assistant), an unmanned aerial vehicle, and the like. Specifically, in some embodiments, the electronic device 20 is a smart phone, the smart phone includes a middle frame and a circuit board, the circuit board is disposed in the middle frame, the camera module 10 is installed in the middle frame of the smart phone, and the light sensing element 110 is electrically connected to the circuit board. By adopting the camera module 10, the electronic device 20 has a large visual angle shooting range, and simultaneously has enough pixels in each degree of view field to realize clear imaging of the module, so that the whole view field has enough pixels and imaging analysis capability, and the electronic device 20 has an excellent imaging effect.

Referring to fig. 14, some embodiments of the present application also provide an automobile 30. At this time, when the electronic device 20 is an in-vehicle image pickup apparatus, the electronic device 20 may function as a front-view image pickup device, a rear-view image pickup device, or a side-view image pickup device of the automobile 30. Specifically, the automobile 30 includes a vehicle body 310, and the housing 210 of the electronic device 20 is mounted on the vehicle body 310. The electronic device 20 may be mounted on any position of the front side of the vehicle body 310 (e.g., at the air intake grille), the left headlight, the right headlight, the left rearview mirror, the right rearview mirror, the trunk lid, the roof, etc. Secondly, a display device may be disposed in the automobile 30, and the electronic device 20 is in communication connection with the display device, so that the image obtained by the electronic device 20 on the automobile body 310 can be displayed on the display device in real time, and a driver can obtain environment information around the automobile body 310 in a wider range, thereby making the driver more convenient and safer to drive and park. When a plurality of electronic devices 20 are provided to acquire scenes in different orientations, image information obtained by the electronic devices 20 can be synthesized and can be presented on the display apparatus in the form of a top view.

Specifically, in some embodiments, the automobile 30 includes at least four electronic devices 20, and the electronic devices 20 are respectively installed on the front side (e.g., at the air intake grille), the left side (e.g., at the left rear view mirror), the right side (e.g., at the right rear view mirror), and the rear side (e.g., at the trunk lid) of the automobile body 310 to construct an automobile all-around system. The automobile all-round system comprises four (or more) electronic devices 20 which are arranged at the front, the back, the left and the right of an automobile body 310, wherein the electronic devices 20 can simultaneously collect scenes around an automobile 30, then image information collected by the electronic devices 20 is subjected to steps of distortion reduction, visual angle conversion, image splicing, image enhancement and the like through an image processing unit, and finally a seamless 360-degree panoramic top view around the automobile 30 is formed and displayed on a display device. Of course, instead of displaying a panoramic view, a single-sided view of any orientation may be displayed. In addition, a scale line corresponding to the display image can be configured on the display device so as to facilitate the driver to accurately determine the direction and distance of the obstacle.

By adopting the electronic device 20, the electronic device 20 can obtain the shooting and clear imaging in a wide angle range for the automobile 30, so that the visual field blind area of a driver can be effectively reduced, the imaging picture quality is improved, the driver can obtain more and clear road condition information on the periphery of the automobile body, and the potential safety hazard of the automobile during lane changing, parking, turning and other operations can be reduced.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A camera module, comprising, in order from an object side to an image side:

a third lens element with positive refractive power;

a fourth lens element with positive refractive power;

a photosensitive element;

and the camera module satisfies the following relations:

0≤Ym/[(1/2)FOVm*P]≤26；

wherein Ym is a half of the image height corresponding to the m-degree angle of view of the camera module in the horizontal direction, m is greater than 0 and less than or equal to 100, FOvm is the m-degree angle of view of the camera module in the horizontal direction, and P is the size of a unit pixel on the photosensitive element.

2. The camera module of claim 1, wherein the following relationship is satisfied:

21≤Y₁₀/[(1/2)FOV10*P]≤26；

wherein, Y₁₀The FOV10 is a 10 ° field angle of the image pickup module in the horizontal direction, which is half of the image height corresponding to the 10 ° field angle of the image pickup module in the horizontal direction.

3. The camera module of claim 1, wherein the following relationship is satisfied:

20≤(Y₅₀-Y₁₀)/[(1/2)(FOV50-FOV10)*P]≤26；

wherein, Y₅₀Is half of the image height corresponding to the 50-degree field angle of the camera module in the horizontal direction, Y₁₀The FOV50 is a half of the image height corresponding to the 10 ° field angle of the camera module in the horizontal direction, the FOV 8932 is a 50 ° field angle of the camera module in the horizontal direction, and the FOV10 is a 10 ° field angle of the camera module in the horizontal direction.

4. The camera module of claim 1, wherein the following relationship is satisfied:

9≤(Y₁₀₀-Y₅₀)/[(1/2)(FOV100-FOV50)*P]≤20；

5. The camera module of claim 1, wherein the following relationship is satisfied:

6＜D34*100/TTL＜16；

d34 is a distance on an optical axis from an image side surface of the third lens element to an object side surface of the fourth lens element, and TTL is a total optical length of the camera module.

6. The camera module of claim 1, wherein the following relationship is satisfied:

3.0<f/tan(HFOV)<4.2；

7. The camera module of claim 1, wherein the following relationship is satisfied:

f/EPD≤1.7；

wherein f is the effective focal length of the camera module, and EPD is the entrance pupil diameter of the camera module.

8. The camera module of claim 1, wherein the following relationship is satisfied:

-5<f1/f<0；

wherein f1 is the focal length of the first lens, and f is the effective focal length of the camera module.

9. The camera module of claim 1, wherein the following relationship is satisfied:

-5＜f2/f＜-1；

wherein f2 is the focal length of the second lens, and f is the effective focal length of the camera module.

10. The camera module of claim 1, wherein the following relationship is satisfied:

3.0≤D23/(1/|R2r|-1/|R3f|)＜5.0；

wherein D23 is a distance on an optical axis between an image-side surface of the second lens element and an object-side surface of the third lens element, R2R is a radius of curvature of the image-side surface of the second lens element on the optical axis, and R3f is a radius of curvature of the object-side surface of the third lens element on the optical axis.

11. The camera module of claim 1, wherein the following relationship is satisfied:

2＜f3/f＜5；

wherein f3 is the focal length of the third lens, and f is the effective focal length of the camera module.

12. The camera module of claim 1, wherein the following relationship is satisfied:

0.3＜(D46-D13)/f<1.5；

wherein D13 is a distance between an object-side surface of the first lens element and an image-side surface of the third lens element on an optical axis, D46 is a distance between an object-side surface of the fourth lens element and an image-side surface of the sixth lens element on the optical axis, and f is an effective focal length of the image capturing module.

13. The camera module of claim 1, wherein the following relationship is satisfied:

4＜f56/f<15；

wherein f56 is the combined focal length of the fifth lens and the sixth lens, and f is the effective focal length of the camera module.

14. The imaging module of any of claims 1 to 13, wherein at least one of the object side surface and/or the image side surface of at least one of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens is aspheric.

15. The camera module of any of claims 1-13, wherein an image side surface of the fifth lens element is cemented with an object side surface of the sixth lens element.

16. An electronic device, comprising a housing and the camera module of any one of claims 1 to 15, wherein the camera module is disposed on the housing.

17. An automobile comprising a vehicle body and the electronic device according to claim 16, wherein the electronic device is provided in the vehicle body.