CN210605168U

CN210605168U - Optical system, camera module and automobile

Info

Publication number: CN210605168U
Application number: CN201921268382.0U
Authority: CN
Inventors: 邹海荣; 乐宇明; 俞炳泽; 兰宾利
Original assignee: OFilm Tech Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2019-08-07
Filing date: 2019-08-07
Publication date: 2020-05-22
Anticipated expiration: 2029-08-07

Abstract

The application relates to an optical system, a camera module and an automobile. The optical system includes in order from an object side to an image side: a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a second lens element with negative refractive power having a concave image-side surface; a third lens element with positive refractive power; a diaphragm; a fourth lens element with positive refractive power; a fifth lens element with negative refractive power; the optical system satisfies the relationship: (SD S2)/(RDY S2) < 0.93; where SD S2 is the Y-direction half aperture of the image-side surface of the first lens, and RDY S2 is the Y radius of the image-side surface of the first lens. At this time, the Y radius and the Y-direction half aperture of the image-side surface of the first lens element can be reasonably matched to effectively control the curvature of the image-side surface of the first lens element, thereby reducing the risk of generating ghost images.

Description

Optical system, camera module and automobile

Technical Field

The utility model relates to an optical imaging field especially relates to optical system, module and car of making a video recording.

Background

With the rapid development of image and calculator vision technologies, more and more technologies are applied to the field of automotive electronics, and the traditional image-based reversing image system only has a camera arranged at the tail of a vehicle, can only eliminate the view blind areas at the tail of the vehicle, cannot eliminate the view blind areas at the two sides of the vehicle body and the head of the vehicle, and still has great potential safety hazards during vehicle running. Especially in narrow congested urban streets and parking lots, the wide range of view dead zones is prone to collision and scratch events. For expanding the field of vision of the driver, 360-degree all-around scene acquisition is realized as far as possible, a plurality of camera modules are required to be arranged on the automobile to be matched with each other in a coordinated mode, and a whole set of images around the automobile body are formed through video synthesis processing.

In order to achieve the above effects and reduce the number of camera modules, the camera module installed on the automobile generally has a wide-angle characteristic, and the first lens of the camera module with the wide-angle characteristic generally has a straw hat-shaped structure, and the image side of the lens is relatively curved, so that the difference between the curvature degrees of the center and the edge of the image side is too large, which causes uneven film coating, thereby easily generating ghost images to reduce the imaging quality and affecting the judgment of the driver on the direction and the distance of the obstacle.

SUMMERY OF THE UTILITY MODEL

Accordingly, it is desirable to provide an optical system, an image pickup module, and an automobile, which can reduce the occurrence of ghost images.

An optical system comprising, in order from an object side to an image side:

the optical lens assembly comprises a first lens element with negative refractive power, a second lens element with negative refractive power, a third lens element with positive refractive power, a fourth lens element with negative refractive power, a fifth lens element with negative refractive power, a sixth lens element with positive refractive power, a sixth lens element with negative refractive power, a sixth lens element;

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

a third lens element with positive refractive power;

a diaphragm;

a fourth lens element with positive refractive power;

a fifth lens element with negative refractive power;

the optical system satisfies the relationship:

(SD S2)/(RDY S2)＜0.93；

wherein SD S2 is the Y-direction half aperture of the image-side surface of the first lens, and RDY S2 is the Y radius of the image-side surface of the first lens. When the relation is met, the Y radius and the Y-direction half aperture of the image side surface of the first lens can be reasonably matched, so that the bending degree of the image side surface of the first lens is effectively controlled, the processing difficulty of the first lens is reduced, the problem of uneven film coating caused by overlarge bending degree of the first lens is avoided, and the risk of generating ghost is reduced.

In one embodiment, the optical system satisfies the relationship:

RDY S3/RDY S2＜7.5；

where RDY S3 is the Y radius of the object side of the second lens.

The size of RDY S2 affects the degree of curvature of the lens and the position where the ghost appears, the larger RDY S2 is, the smoother the lens surface is, the closer the position where the ghost appears is to the edge, the size of RDY S3 value affects the brightness of the ghost, the size, intensity and shape of the ghost vary with the change of the relation between RDY S2 and RDY S3, when the above relation is satisfied, RDY S3 and RDY S2 can be reasonably arranged, and the ghost phenomenon can be minimized.

In one embodiment, when RDY S3 is negative, the optical system satisfies the relationship: -15.0 < RDY S3/RDY S2 < -7.5;

when RDY S3 is positive, the optical system satisfies the relationship: 3.5 < RDY S3/RDY S2 < 5.5. When the above relationship is satisfied, the size and intensity of the ghost can be kept to the minimum.

In one embodiment, the optical system satisfies the relationship:

RDY S4/f2＜-0.45；

wherein RDY S4 is the Y radius of the image side of the second lens, and f2 is the focal length of the second lens. When the relation is satisfied, the bending degree of the second lens is reasonably controlled so as to further reduce the size and the strength of the ghost image.

In one embodiment, the optical system satisfies the relationship:

(ΣCT68/TTL)*100＜20；

the Σ CT68 is a distance between an image-side surface of the third lens element and an object-side surface of the fourth lens element at an optical axis, and TTL is a total length of the optical system. When the above relation is satisfied, the thickness of each lens can be reasonably controlled, so as to effectively shorten the total length of the optical system.

In one embodiment, the optical system satisfies the relationship:

ImgH/f＞1.5；

wherein ImgH is one half of the image height of the optical system in the horizontal direction, and f is the focal length of the optical system. When the relation is satisfied, the image height and the focal length of the optical system can be reasonably configured, so that the influence of external conditions on the optical system is reduced, the imaging is stable, and meanwhile, the miniaturization design of the optical system is facilitated.

In one embodiment, the optical system satisfies the relationship:

|Dist|＜110；

where Dist is the optical distortion of the optical system, and the unit of Dist is%. When the relation is satisfied, the distortion quantity of the whole optical system can be controlled, so that the problem of overlarge distortion commonly existing in the wide-angle lens is reduced.

In one embodiment, the optical system satisfies the relationship:

f/D≤2.1；

wherein f is the focal length of the optical system, and D is the entrance pupil diameter of the optical system. When the above relationship is satisfied, the optical system has an effect of a large aperture.

In one embodiment, the optical system satisfies the relationship:

3＜f45/f＜4；

wherein f45 is a combined focal length of the fourth lens and the fifth lens, and f is a focal length of the optical system. When the relationship is satisfied, the refractive power of the whole optical system can be reasonably distributed, the sensitivities of the fourth lens and the fifth lens are reduced, and the yield is improved.

In one embodiment, the optical system satisfies the relationship:

Nd2≤1.55；Nd4≤1.55；Vd2≥54；Vd4≥54；

wherein Nd2 is a refractive index of a d-line of the second lens, Nd4 is a refractive index of a d-line of the fourth lens, Vd2 is an abbe number of the second lens, and Vd4 is an abbe number of the fourth lens. When the above relation is satisfied, it is beneficial to correct the off-axis chromatic aberration and improve the resolution of the optical system.

In one embodiment, the optical system satisfies the relationship:

Nd3≥1.55；Nd5≥1.55；Vd3≤33；Vd5≤33；

wherein Nd3 is a refractive index of a d-line of the third lens, Nd5 is a refractive index of a d-line of the fifth lens, Vd3 is an abbe number of the third lens, and Vd5 is an abbe number of the fifth lens. When the above relation is satisfied, it is beneficial to correct the off-axis chromatic aberration and improve the resolution of the optical system.

An image capturing module includes a photosensitive element and the optical system of any of the above embodiments, wherein the photosensitive element is disposed on an image side of the optical system.

The utility model provides an automobile, includes automobile body, display device and a plurality of above-mentioned embodiment the module of making a video recording, it is a plurality of the module of making a video recording respectively with display device communication connection, front side, rear side, left side and the right side of automobile body are provided with at least one respectively the module of making a video recording, it is a plurality of the module of making a video recording can acquire the automobile body image all around, the image can show on the display device.

Drawings

FIG. 1 is a schematic view of an optical system according to a first embodiment of the present disclosure;

fig. 2 is a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

FIG. 3 is a schematic view of an optical system provided in a second embodiment of the present application;

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

FIG. 5 is a schematic view of an optical system provided in a third embodiment of the present application;

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

FIG. 7 is a schematic view of an optical system provided in a fourth embodiment of the present application;

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

fig. 9 is a schematic view of an optical system provided in a fifth embodiment of the present application;

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

fig. 11 is a schematic view of a camera module using an optical system according to an embodiment of the present disclosure;

fig. 12 is a schematic view of an automobile using a camera module according to an embodiment of the present application.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The 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.

Referring to fig. 1, the optical system 100 in the embodiment of the present application 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 fourth lens element L4 with positive refractive power, and a fifth lens element L5 with negative refractive power.

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, and the fifth lens L5 includes an object side surface S9 and an image side surface S10. In addition, the image side of the fifth lens L5 has an image plane S15, and the image plane S15 may be photosensitive surfaces of the photosensitive elements.

The object-side surface S1 of the first lens element L1 is convex, the image-side surface S2 of the first lens element L1 is concave, and the image-side surface S4 of the second lens element L2 is concave.

In some embodiments, the object-side surface S1 and the image-side surface S2 of the first lens element L1 are spherical, and the object-side surface and the image-side surface of the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 are aspheric. In addition to the above embodiments, both the object-side surface and the image-side surface of each lens may be aspherical.

When the object-side surface or the image-side surface of the lens is aspheric, reference may be made to the aspheric formula:

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

In some embodiments, optical system 100 further includes an optical stop ST 0. The stop ST0 may be disposed between the third lens L3 and the fourth lens L4. It should be noted that when it is described that the stop STO is disposed between the third lens L3 and the fourth lens L4, the projection of the stop STO on the optical axis may overlap with the projection of the third lens L3 or the fourth lens L4 on the optical axis, or may not overlap.

In some embodiments, the first lens L1 is made of glass, and the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are made of plastic, so that the first lens L1 closest to the object side (outside) can better withstand the influence of the ambient temperature on the object side, and the optical system 100 can have a lower production cost due to the fact that other lenses are made of plastic.

In addition to the above-mentioned relationship of the materials of the lenses, in some embodiments, the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are all plastics, and in this case, the plastic lenses can reduce the weight of the optical system 100 and reduce the production cost. In some embodiments, the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 are made of glass, and thus the optical system 100 can endure higher temperature and has better optical performance.

In some embodiments, an infrared filter L6 made of glass is disposed on the image side of the fifth lens element L5. The infrared filter L6 includes an object side S11 and an image side S12. The infrared filter L6 is used for filtering light rays of the image, specifically for isolating infrared light, and preventing the infrared light from reaching the image plane S15, so as to prevent the infrared light from affecting the color and the definition of a normal image, and further improve the imaging quality of the optical system 100. The infrared filter L6 may be assembled with each lens into the optical system 100, or may be installed between the optical system 100 and the light-receiving element when the optical system 100 and the light-receiving element are assembled into a module.

In some embodiments, a protective glass L7 is disposed on the image side of the fifth lens L5. Cover glass L7 includes object side S13 and image side S14. Specifically, the protective glass L7 is disposed on the image side of the infrared filter L6 to be close to the photosensitive element during the subsequent assembly into a module, so as to protect the photosensitive element.

In some embodiments, the optical system may further include a mirror, an aperture stop, a filter, a cover glass, a photosensitive element, and the like, in addition to the lens with refractive power.

In some embodiments, the optical system 100 satisfies the following relationship:

(SD S2)/(RDY S2)＜0.93；

here, SD S2 is the Y-direction half aperture of the image side surface S2 of the first lens L1, and RDY S2 is the Y radius of the image side surface S2 of the first lens L1. When the relation is satisfied, the Y radius and the Y-direction half aperture of the image-side surface S2 of the first lens L1 can be reasonably matched, so that the bending degree of the image-side surface S2 of the first lens L1 is effectively controlled, the processing difficulty of the first lens L1 is reduced, the problem of uneven film coating caused by the overlarge bending degree of the first lens L1 is avoided, and the risk of generating ghost images is reduced.

In some embodiments, optical system 100 satisfies the relationship:

RDY S3/RDY S2＜7.5；

RDY S3 is the Y radius of the object side S3 of the second lens L2. In particular, RDY S3/RDY S2 may be-13.70, -13.65, -13.60, -5.00, -4.50, -3.00, -2.00, 4.20, 4.70, 5.00, or 5.10. The size of RDY S2 affects the degree of curvature of the lens and the position where the ghost appears, the larger RDY S2 is, the smoother the lens surface is, the closer the position where the ghost appears is to the edge, the size of RDY S3 value affects the brightness of the ghost, the size, intensity and shape of the ghost vary with the change of the relationship between RDYS2 and RDY S3, when the above relationship is satisfied, RDY S3 and RDY S2 can be reasonably configured, and the ghost phenomenon can be minimized.

In some embodiments, when RDY S3 is negative, optical system 100 satisfies the relationship: -15.0 < RDY S3/RDYs2 < -7.5;

when RDY S3 is positive, optical system 100 satisfies the relationship: 3.5 < RDY S3/RDY S2 < 5.5. When the above relationship is satisfied, the size and intensity of the ghost can be kept to the minimum.

In some embodiments, optical system 100 satisfies the relationship:

RDY S4/f2＜-0.45；

here, RDY S4 is the Y radius of the image side surface S4 of the second lens L2, and f2 is the focal length of the second lens L2. In particular, RDY S4/f2 may be-0.70, -0.68, -0.65, -0.55. When the above relationship is satisfied, the degree of curvature of the second lens L2 is controlled appropriately to further reduce the size and strength of the ghost image.

In some embodiments, optical system 100 satisfies the relationship:

(ΣCT68/TTL)*100＜20；

the Σ CT68 is a distance between the image-side surface S6 of the third lens L3 and the object-side surface S7 of the fourth lens L4 at the optical axis, and TTL is the total length of the optical system. Specifically, (Σ CT68/TTL) 100 may be 13.0, 14.0, 15.0, 16.0, 16.6, 17.0, 17.3, or 17.4. When the above relation is satisfied, the thickness of each lens can be reasonably controlled, so as to effectively shorten the total length of the optical system.

In some embodiments, optical system 100 satisfies the relationship:

ImgH/f＞1.5；

where ImgH is one-half of the image height of the optical system 100 in the horizontal direction, and f is the focal length of the optical system. Specifically, ImgH/f may be 1.83, 1.84, 1.85, 1.86, or 1.88. When the relation is satisfied, the image height and the focal length of the optical system can be reasonably configured, so that the influence of external conditions on the optical system is reduced, the imaging is stable, and meanwhile, the miniaturization design of the optical system is facilitated.

In some embodiments, optical system 100 satisfies the relationship:

|Dist|＜110；

where Dist is the optical distortion of the optical system, Dist is expressed in units of% < Dist < 110%. In particular, Dist can be-108.00, -107.98, or-107.99. When the relation is satisfied, the distortion quantity of the whole optical system can be controlled, so that the problem of overlarge distortion commonly existing in the wide-angle lens is reduced.

In some embodiments, optical system 100 satisfies the relationship:

f/D≤2.1；

where f is the focal length of the optical system and D is the entrance pupil diameter of the optical system 100. When the above relationship is satisfied, the optical system has an effect of a large aperture.

In some embodiments, optical system 100 satisfies the relationship:

3＜f45/f＜4；

where f45 is a combined focal length of the fourth lens L4 and the fifth lens L5, and f is a focal length of the optical system. Specifically, f45/f may be 3.20, 3.25, 3.30, 3.35, 3.45, or 3.45. When the above relationship is satisfied, the refractive power of the entire optical system can be reasonably distributed, the sensitivities of the fourth lens element L4 and the fifth lens element L5 are reduced, and the yield is improved.

In some embodiments, optical system 100 satisfies the relationship:

Nd2≤1.55；Nd4≤1.55；Vd2≥54；Vd4≥54；

wherein Nd2 is a refractive index of a d-line of the second lens L2, Nd4 is a refractive index of a d-line of the fourth lens L4, Vd2 is an abbe number of the second lens L2, and Vd4 is an abbe number of the fourth lens L4. When the above relation is satisfied, it is beneficial to correct the off-axis chromatic aberration and improve the resolution of the optical system.

In some embodiments, optical system 100 satisfies the relationship:

Nd3≥1.55；Nd5≥1.55；Vd3≤33；Vd5≤33；

nd3 is the refractive index of the d-line of the third lens L3, Nd5 is the refractive index of the d-line of the fifth lens L5, Vd3 is the abbe number of the third lens L3, and Vd5 is the abbe number of the fifth lens L5. When the above relation is satisfied, it is beneficial to correct the off-axis chromatic aberration and improve the resolution of the optical system.

First embodiment

In the first embodiment shown in fig. 1, the optical system 100 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 ST0, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, and an ir filter L6 and a protective glass L7 are disposed on the image side of the fifth lens element L5. Fig. 2 is a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 100 in the first embodiment, wherein the astigmatism diagram and the distortion diagram are data diagrams at a reference wavelength. The reference wavelength in this and the following examples is 587.56 nm.

The object-side surface S1 of the first lens element L1 is convex, and the image-side surface S2 of the first lens element L1 is concave. The object side S3 of the second lens L2 is concave; the image-side surface S4 of the second lens L2 is concave. The object-side surface S5 of the third lens element L3 is convex, and the image-side surface S6 of the third lens element L3 is convex. The object-side surface S7 of the fourth lens element L4 is convex, and the image-side surface S8 of the fourth lens element L4 is convex. The object-side surface S9 of the fifth lens element L5 is concave, and the image-side surface S10 of the fifth lens element L5 is convex.

The object-side surface S1 and the image-side surface S2 of the first lens element L1 are spherical surfaces, and the object-side surface and the image-side surface of the second lens element L2, the third lens element L3, the fourth lens element L4, and the fifth lens element L5 are aspherical surfaces.

The first lens L1 is made of glass, and the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are made of plastic.

The optical system 100 also satisfies the following relationship:

(SD S2)/(RDY S2)＝0.92；

RDY S3/RDY S2 ═ -13.72; RDY S3 is the Y radius of the object side S3 of the second lens L2. The size of RDY S2 affects the degree of curvature of the lens and the position where the ghost appears, the larger RDY S2 is, the smoother the lens surface is, the closer the position where the ghost appears is to the edge, and the size of RDY S3 value affects the brightness of the ghost, the size, intensity, and shape of the ghost vary with the change of the relationship between RDY S2 and RDY S3, when the above relationship is satisfied, RDY S3 and RDY S2 can be reasonably arranged, the ghost phenomenon can be minimized, and the size and intensity of the ghost can be maintained at the minimum state.

RDY S4/f2 ═ 0.56; here, RDY S4 is the Y radius of the image side surface S4 of the second lens L2, and f2 is the focal length of the second lens L2. When the above relationship is satisfied, the degree of curvature of the second lens L2 is controlled appropriately to further reduce the size and strength of the ghost image.

(Σ CT68/TTL) × 100 ═ 12.9; the Σ CT68 is a distance between the image-side surface S6 of the third lens L3 and the object-side surface S7 of the fourth lens L4 at the optical axis, and TTL is the total length of the optical system. When the above relation is satisfied, the thickness of each lens can be reasonably controlled, so as to effectively shorten the total length of the optical system.

ImgH/f is 1.86; where ImgH is one-half of the image height of the optical system 100 in the horizontal direction, and f is the focal length of the optical system. When the relation is satisfied, the image height and the focal length of the optical system can be reasonably configured, so that the influence of external conditions on the optical system is reduced, the imaging is stable, and meanwhile, the miniaturization design of the optical system is facilitated.

Dist ═ 108; where Dist is the optical distortion of the optical system, and the unit of Dist is%. When the relation is satisfied, the distortion quantity of the whole optical system can be controlled, so that the problem of overlarge distortion commonly existing in the wide-angle lens is reduced.

f/D is 2.1; where f is the focal length of the optical system and D is the entrance pupil diameter of the optical system 100. When the above relationship is satisfied, the optical system has an effect of a large aperture.

f45/f is 3.19; where f45 is a combined focal length of the fourth lens L4 and the fifth lens L5, and f is a focal length of the optical system. When the above relationship is satisfied, the refractive power of the entire optical system can be reasonably distributed, the sensitivities of the fourth lens element L4 and the fifth lens element L5 are reduced, and the yield is improved.

Nd 2-1.545; nd 4-1.545; vd 2-56.00; vd 4-56.00; wherein Nd2 is a refractive index of a d-line of the second lens L2, Nd4 is a refractive index of a d-line of the fourth lens L4, Vd2 is an abbe number of the second lens L2, and Vd4 is an abbe number of the fourth lens L4. When the above relation is satisfied, it is beneficial to correct the off-axis chromatic aberration and improve the resolution of the optical system.

Nd3 ═ 1.661; nd5 ═ 1.661; vd 3-20.37; vd 5-20.37; nd3 is the refractive index of the d-line of the third lens L3, Nd5 is the refractive index of the d-line of the fifth lens L5, Vd3 is the abbe number of the third lens L3, and Vd5 is the abbe number of the fifth lens L5. When the above relation is satisfied, it is beneficial to correct the off-axis chromatic aberration and improve the resolution of the optical system.

In the first embodiment, the focal length f of the optical system is 0.965mm, the aperture value FNO is 2.1, and the half (1/2) FOV of the horizontal-direction angle of view is 92.5 degrees (deg.).

In addition, the respective parameters of the optical system 100 are given by table 1 and table 2. The elements from the object plane to the image plane S15 are sequentially arranged in the order of the elements from top to bottom in table 1. The surface numbers 1 and 2 are the object-side surface S1 and the image-side surface S2 of the first lens L1, respectively, that is, the surface with the smaller surface number is the object-side surface and the surface with the larger surface number is the 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 at the paraxial position of the corresponding face number. The first value in the "thickness" parameter list of the first lens element L1 is the thickness of the lens element along the optical axis, and the second value is the distance from the image-side surface of the lens element to the object-side surface of the subsequent lens element along the optical axis. The "thickness" parameter in the face number 6 is the distance from the image-side face S6 of the third lens L3 to the stop ST 0. The numerical value of the stop ST0 in the "thickness" parameter column is the distance on the optical axis from the stop ST0 to the vertex of the object-side surface of the subsequent lens (the vertex refers to the intersection point of the lens and the optical axis), the direction from the object-side surface of the first lens to the image-side surface of the last lens is the positive direction of the optical axis by default, when the value is negative, it indicates that the stop ST0 is disposed on the right side of the vertex of the object-side surface of the lens, and when the "thickness" parameter of the stop STO is positive, the stop ST0 is on the left side of the vertex of the object-side surface. The "thickness" parameter value in the surface number 11 is the distance on the optical axis from the image-side surface S10 of the fifth lens L5 to the object-side surface S11 of the infrared filter L6. The value corresponding to the plane number 13 in the "thickness" parameter of the infrared filter L6 (filter in table 1) is the distance from the image-side surface S12 of the infrared filter L6 to the object-side surface S13 of the protective glass L7 on the optical axis. Table 2 is a table of relevant parameters of the aspherical surface of each lens in table 1, where K is a conic constant and Ai is a coefficient corresponding to the i-th high-order term in the aspherical surface type formula.

In the following examples, the refractive index and focal length of each lens are numerical values at a reference wavelength of 587.56 nm.

TABLE 1

TABLE 2

Second embodiment

In the second embodiment as shown in fig. 3, the optical system 100 includes, in order from the object side to the image side, 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, a stop STO, the fourth lens element L4 with positive refractive power, and the fifth lens element L5 with negative refractive power. The image side of the fifth lens L5 is further provided with an infrared filter L6 and a protective glass L7 in this order. Fig. 4 is a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 100 in the second embodiment, wherein the astigmatism diagram and the distortion diagram are data diagrams at a reference wavelength.

The object-side surface S1 of the first lens element L1 is convex, and the image-side surface S2 of the first lens element L1 is concave. The object side S3 of the second lens L2 is concave; the image-side surface S4 of the second lens L2 is concave. The object-side surface S5 of the third lens element L3 is concave, and the image-side surface S6 of the third lens element L3 is convex. The object-side surface S7 of the fourth lens element L4 is convex, and the image-side surface S8 of the fourth lens element L4 is convex. The object-side surface S9 of the fifth lens element L5 is concave, and the image-side surface S10 of the fifth lens element L5 is convex.

In the second embodiment, the effective focal length f of the optical system 100 is 0.975mm, the aperture value FNO is 2.1, and the half of the horizontal-direction angle of view (1/2) FOV is 92.5 degrees (deg.).

In addition, the parameters of the optical system 100 are given in tables 3 and 4, and the definitions of the parameters can be obtained from the first embodiment, which is not repeated herein.

TABLE 3

TABLE 4

The following data can be derived according to the provided parameter information:

third embodiment

In the third embodiment shown in fig. 5, the optical system 100 includes, in order from the object side to the image side, 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, a stop STO, the fourth lens element L4 with positive refractive power, and the fifth lens element L5 with negative refractive power. The image side of the fifth lens L5 is further provided with an infrared filter L6 and a protective glass L7 in this order. Fig. 6 is a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 100 in the third embodiment, wherein the astigmatism diagram and the distortion diagram are data diagrams at a reference wavelength.

In the third embodiment, the effective focal length f of the optical system 100 is 0.98mm, the aperture value FNO is 2.1, and the half of the horizontal-direction angle of view (1/2) FOV is 92.5 degrees (deg.).

In addition, the parameters of the optical system 100 are given in tables 5 and 6, and the definitions of the parameters can be obtained from the first embodiment, which is not repeated herein.

TABLE 5

TABLE 6

fourth embodiment

In the fourth embodiment shown in fig. 7, the optical system 100 includes, in order from the object side to the image side, 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, a stop STO, the fourth lens element L4 with positive refractive power, and the fifth lens element L5 with negative refractive power. The image side of the fifth lens L5 is further provided with an infrared filter L6 and a protective glass L7 in this order. Fig. 8 is a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 100 in the fourth embodiment, wherein the astigmatism diagram and the distortion diagram are data diagrams at a reference wavelength.

The object-side surface S1 of the first lens element L1 is convex, and the image-side surface S2 of the first lens element L1 is concave. The object-side surface S3 of the second lens element L2 is convex; the image-side surface S4 of the second lens L2 is concave. The object-side surface S5 of the third lens element L3 is concave, and the image-side surface S6 of the third lens element L3 is convex. The object-side surface S7 of the fourth lens element L4 is convex, and the image-side surface S8 of the fourth lens element L4 is convex. The object-side surface S9 of the fifth lens element L5 is concave, and the image-side surface S10 of the fifth lens element L5 is convex.

In the fourth embodiment, the effective focal length f of the optical system 100 is 0.952mm, the aperture value FNO is 2.1, and the half (1/2) FOV of the horizontal-direction angle of view is 92.5 degrees (deg.).

In addition, the parameters of the optical system 100 are given in tables 7 and 8, and the definitions of the parameters can be obtained from the first embodiment, which is not repeated herein.

TABLE 7

TABLE 8

fifth embodiment

In the fifth embodiment shown in fig. 9, the optical system 100 includes, in order from the object side to the image side, 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, a stop STO, the fourth lens element L4 with positive refractive power, and the fifth lens element L5 with negative refractive power. The image side of the fifth lens L5 is further provided with an infrared filter L6 and a protective glass L7 in this order. Fig. 10 is a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 100 in the fifth embodiment, in which the astigmatism diagram and the distortion diagram are data diagrams at a reference wavelength.

In the fifth embodiment, the effective focal length f of the optical system 100 is 0.960mm, the aperture value FNO is 2.1, and the half of the horizontal-direction angle of view (1/2) FOV is 92.5 degrees (deg.).

In addition, the parameters of the optical system 100 are given in tables 9 and 10, and the definitions of the parameters can be obtained from the first embodiment, which is not described herein again.

TABLE 9

Watch 10

referring to fig. 11, the optical system and the photosensitive element 210 are assembled into the image module 200, and the photosensitive element 210 is disposed on the image side of the optical system. The photosensitive element 210 may be a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor).

In some embodiments, the lens of the optical system and the photosensitive element 210 are fixed relatively, and the image capturing module 200 is a fixed focus module. In other embodiments, the focusing function is achieved by configuring the voice coil motor to enable the photosensitive element 210 to move relative to the lens in the optical system.

The camera module 200 can be applied to electronic equipment in the fields of mobile phones, automobiles, monitoring and the like, and can be specifically used as a mobile phone camera, a vehicle-mounted camera or a monitoring camera.

Referring to fig. 12, when the camera module 200 is applied to the automobile 30 as an in-vehicle camera, the camera module 200 may be used as a front camera, a rear camera, or a side camera of the automobile 30. Specifically, the automobile 30 includes a body 310, and the camera module 200 can be mounted on any position of the front side (e.g., at an air intake grille), a left headlight, a right headlight, a left rearview mirror, a right rearview mirror, a trunk, a roof, etc. of the body 310. Secondly, also can set up display device in car 30, the module 200 of making a video recording and display device communication connection to, the image that the module 200 of making a video recording on automobile body 310 obtained can show on display device in real time, lets the driver can obtain the image information around automobile body 310, makes the driver can observe peripheral sight blind area, makes the driver more convenient and safe when driving and parking. When a plurality of camera modules 200 are provided to acquire scenes in different directions, image information obtained by the camera modules 200 can be synthesized and can be presented on a display apparatus in the form of a top view.

Specifically, the car 30 includes at least four camera modules 200, and the camera modules 200 are respectively installed at the front side (e.g., an air intake grille), the left side, the right side, and the rear side (e.g., a trunk) of the car body 310 to construct a car surround view system. The automobile all-round system comprises four (or more) camera modules 200 which are arranged on the front, the back, the left and the right of an automobile body 310, wherein the plurality of camera modules 200 can simultaneously collect images around an automobile 30, then the image information collected by the camera modules 200 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.

In some embodiments, a driving recorder is installed in the automobile 30, and the image information obtained by the camera module 200 can be stored in the driving recorder.

Through adopting above-mentioned module 200 of making a video recording, can effectively reduce the ghost phenomenon in the image information of gathering by the module 200 of making a video recording to improve imaging quality.

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 represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An optical system comprising, in order from an object side to an image side:

a third lens element with positive refractive power;

a diaphragm;

a fourth lens element with positive refractive power;

a fifth lens element with negative refractive power;

the optical system satisfies the relationship:

(SD S2)/(RDY S2)＜0.93；

wherein SD S2 is the Y-direction half aperture of the image-side surface of the first lens, and RDY S2 is the Y radius of the image-side surface of the first lens.

2. The optical system of claim 1, wherein the optical system satisfies the relationship:

RDY S3/RDY S2＜7.5；

where RDY S3 is the Y radius of the object side of the second lens.

3. The optical system of claim 2, wherein the optical system satisfies the relationship:

when RDY S3 is negative, the optical system satisfies the relationship: -15.0 < RDY S3/RDY S2 < -7.5;

when RDY S3 is positive, the optical system satisfies the relationship: 3.5 < RDY S3/RDY S2 < 5.5.

4. The optical system of claim 1, wherein the optical system satisfies the relationship:

RDY S4/f2＜-0.45；

wherein RDY S4 is the Y radius of the image side of the second lens, and f2 is the focal length of the second lens.

5. The optical system of claim 1, wherein the optical system satisfies the relationship:

(ΣCT68/TTL)*100＜20；

the Σ CT68 is a distance between an image-side surface of the third lens element and an object-side surface of the fourth lens element at an optical axis, and TTL is a total length of the optical system.

6. The optical system of claim 1, wherein the optical system satisfies the relationship:

ImgH/f＞1.5；

wherein ImgH is one half of the image height of the optical system in the horizontal direction, and f is the focal length of the optical system.

7. The optical system of claim 1, wherein the optical system satisfies the relationship:

|Dist|＜110；

where Dist is the optical distortion of the optical system, and the unit of Dist is%.

8. The optical system of claim 1, wherein the optical system satisfies the relationship:

f/D≤2.1；

wherein f is the focal length of the optical system, and D is the entrance pupil diameter of the optical system.

9. The optical system of claim 1, wherein the optical system satisfies the relationship:

3＜f45/f＜4；

wherein f45 is a combined focal length of the fourth lens and the fifth lens, and f is a focal length of the optical system.

10. The optical system of claim 1, wherein the optical system satisfies the relationship:

Nd2≤1.55；Nd4≤1.55；Vd2≥54；Vd4≥54；

wherein Nd2 is a refractive index of a d-line of the second lens, Nd4 is a refractive index of a d-line of the fourth lens, Vd2 is an abbe number of the second lens, and Vd4 is an abbe number of the fourth lens.

11. The optical system of claim 1, wherein the optical system satisfies the relationship:

Nd3≥1.55；Nd5≥1.55；Vd3≤33；Vd5≤33；

wherein Nd3 is a refractive index of a d-line of the third lens, Nd5 is a refractive index of a d-line of the fifth lens, Vd3 is an abbe number of the third lens, and Vd5 is an abbe number of the fifth lens.

12. An image pickup module comprising a photosensitive element and the optical system according to any one of claims 1 to 11, wherein the photosensitive element is disposed on an image side of the optical system.

13. An automobile, characterized in that, including automobile body, display device and a plurality of the module of making a video recording of claim 12, a plurality of the module of making a video recording respectively with display device communication connection, the front side, rear side, left side and the right side of automobile body are provided with at least one respectively the module of making a video recording, and a plurality of the module of making a video recording can acquire the image around the automobile body, the image can show on display device.