CN212364695U

CN212364695U - Optical system, camera module, electronic equipment and automobile

Info

Publication number: CN212364695U
Application number: CN202021250904.7U
Authority: CN
Inventors: 蔡雄宇; 兰宾利; 赵迪; 周芮
Original assignee: Tianjin OFilm Opto Electronics Co Ltd
Current assignee: Jiangxi Oufei Optics Co ltd
Priority date: 2020-07-01
Filing date: 2020-07-01
Publication date: 2021-01-15
Anticipated expiration: 2030-07-01

Abstract

The utility model relates to an optical system, module, electronic equipment and car of making a video recording. The optical system includes in order from an object side to an image side: a negative first lens element having a convex object-side surface and a concave image-side surface; a negative second lens element having a concave image-side surface; a positive third lens element having a convex image-side surface; a positive fourth lens element having a convex image-side surface; a positive fifth lens element having convex object-side and image-side surfaces; a negative sixth lens element having a concave object-side surface and cemented with the fifth lens element; the optical system further comprises a diaphragm arranged between the two adjacent lenses, the object side surfaces and/or the image side surfaces of at least two lenses in the system are aspheric surfaces, and the system satisfies the following relation: TTL/EPL is more than or equal to 1.8 and less than or equal to 1.99; TTL is the distance on the optical axis from the object-side surface of the first lens element to the image plane of the optical system, and EPL is the distance on the optical axis from the stop to the image plane of the optical system. The optical system has good telecentric property, thereby improving the imaging quality.

Description

Optical system, camera module, electronic equipment and automobile

Technical Field

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

Background

Since the camera lens is applied to electronic devices such as smart phones and tablet computers, the shooting performance of the device also changes with the increase of high-quality shooting requirements of users. Generally, the quality of the shooting performance of the device does not depend on the optical performance of the lens or the pixel size of the photosensitive element alone, and also depends on the arrangement relationship between the lens and the photosensitive element. Therefore, it has become one of the important concerns in the industry how to improve the adaptive relationship between the lens and the photosensitive element to improve the image capturing performance of the device.

SUMMERY OF THE UTILITY MODEL

Accordingly, it is necessary to provide an optical system, an image pickup module, an electronic device, and an automobile for improving the fitting relationship between the lens and the photosensitive element.

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

the lens comprises a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface;

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

a third lens element with positive refractive power having a convex image-side surface;

a fourth lens element with positive refractive power having a convex image-side surface;

the fifth lens element with positive refractive power has 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 cemented with the fifth lens element;

the object side surfaces and/or the image side surfaces of at least two lenses in the optical system are/is aspheric surfaces;

the optical system further comprises a diaphragm which is arranged between two adjacent lenses in the optical system, and the optical system satisfies the following relation:

1.8≤TTL/EPL≤1.99；

wherein, TTL is a distance on the optical axis from the object-side surface of the first lens element to the imaging surface of the optical system, and EPL is a distance on the optical axis from the diaphragm to the imaging surface of the optical system.

In the above optical system, the position of the diaphragm compared with the imaging surface of the system can be reasonably set, so that the diaphragm is reasonably far away from the imaging surface, and the marginal incident beams are eliminated to a certain extent, thereby depressing the incident angles of the chief rays of each field of view on the imaging surface of the system, and enabling the chief rays of different fields of view to be incident on the imaging surface of the optical system in a manner close to the vertical, so that the optical system has good telecentric property. Furthermore, when the optical system has good telecentric property, the optical system and the photosensitive element can form good adaptation, so that the incident beam is incident to the photosensitive surface in a nearly vertical mode, the photosensitive sensitivity of the photosensitive element is improved, the possibility of generating a dark angle by the system is reduced, and the imaging quality is improved. When the upper limit of the above relationship is exceeded, it is not favorable to limit the total length of the optical system and to realize a compact design; and when the distance is lower than the lower limit of the relational expression, the distance between the diaphragm and the imaging surface of the system is too far, which is not beneficial to the realization of the telecentric characteristic of the system.

In one embodiment, the optical system satisfies the following relationship:

53°≤(FOV*f)/Imgh≤62°；

wherein FOV is the maximum field angle of the optical system, f is the effective focal length of the optical system, and Imgh is the image height corresponding to the maximum field angle of the optical system. When the relation is satisfied, the image height and the field angle of the optical system form a proper proportional relation, so that a sufficient field angle can be provided for the system, the system has a wide-angle characteristic, and meanwhile, the angle of incident light rays entering the photosensitive element can be reduced, and the photosensitive performance of the photosensitive element is improved. When the distance is lower than the lower limit of the relational expression, the field angle of the system is insufficient, and enough object space information cannot be obtained; if the upper limit of the relational expression is exceeded, the amount of light transmitted through the system is insufficient, and the requirement for high-definition shooting cannot be satisfied.

In one embodiment, the optical system satisfies the following relationship:

-2.3≤f1/R2≤-1.9；

wherein f1 is an effective focal length of the first lens, and R2 is a curvature radius of an image side surface of the first lens on an optical axis. When the relation is satisfied, the bending degree of the image side surface of the first lens can be reasonably controlled, and the risk of generating ghost images is reduced. On the other hand, when the image-side surface of the first lens has a small curvature radius, it is advantageous for designing a wide angle of the system, and by satisfying the above relationship, it is possible to prevent the curvature radius of the image-side surface of the first lens from being excessively small, thereby making it possible to suppress a strong divergent action of the light beam in the peripheral field, and further suppress the generation of high-order aberration.

In one embodiment, the optical system satisfies the following relationship:

1≤d1/f≤1.8；

wherein d1 is the distance on the optical axis from the image-side surface of the first lens element to the object-side surface of the second lens element, and f is the effective focal length of the optical system. When the relationship is satisfied, the distance between the first lens and the second lens can be reasonably set, the phenomenon that an incident beam is diverged by the first lens and greatly expanded can be effectively inhibited, the convergence action of a lens group on the image side of the second lens does not need to be excessively enhanced, and therefore the system can be prevented from generating large aberration. When the lower limit condition of the relation is met, the incident light beam can be fully diverged to enter the second lens after passing through the first lens, so that the ultra-wide angle performance of the system is favorably realized; when the upper limit condition is met, the distance between the first lens and the second lens is set reasonably and is not too large, so that the assembly yield of the lenses can be improved, and the generation of stray light is reduced.

In one embodiment, the diaphragm is disposed between the third lens and the fourth lens, and the optical system satisfies the following relationship:

3≤f3/f≤6；

wherein f3 is an effective focal length of the third lens, and f is an effective focal length of the optical system. When the relation is satisfied, the third lens can well converge the light beams diverged by the first lens and the second lens, so that the distance between the third lens and the diaphragm is reduced, and the optical system is favorably miniaturized. Further, when the above relationship is satisfied, the third lens element will have a sufficient refractive power, so that the burden of the light beam converging action of the fourth lens element can be reduced.

In one embodiment, the optical system satisfies the following relationship:

6≤|R5-R6|/d3≤35；

wherein R5 is a radius of curvature of an object-side surface of the third lens element on an optical axis, R6 is a radius of curvature of an image-side surface of the third lens element on the optical axis, and d3 is a distance from the image-side surface of the third lens element to an object-side surface of the fourth lens element on the optical axis. When the relationship is satisfied, the surface shapes of the object side surface and the image side surface of the third lens tend to be smooth, and the deviation of the incident angle and the emergent angle of the light rays with different viewing fields can be reduced, so that the sensitivity is reduced, and the generation of ghost images is reduced. When the distance is lower than the lower limit of the relational expression, the air spacing distance between the third lens and the fourth lens is too large, which is not beneficial to the improvement of the assembly yield, and is also easy to generate ghost images, and is not beneficial to the miniaturization design of the system. When the curvature radius is higher than the upper limit of the relational expression, the curvature radius of the object side surface of the third lens is too large, so that the risk of generating ghost is not reduced.

In one embodiment, the optical system satisfies the following relationship:

R5-R6 l/d 3 is more than or equal to 6 and less than or equal to 16. When the relationship is satisfied, better balance can be obtained between the reduction of ghost generation and the system miniaturization design.

In one embodiment, the optical system satisfies the following relationship:

1.3≤(CT2+CT3)/f≤2.4；

wherein CT2 is the thickness of the second lens element, CT3 is the thickness of the third lens element, and f is the effective focal length of the optical system. The refractive power and the thickness of the lens are closely related, when the relationship is met, the central thicknesses of the second lens and the third lens can be reasonably set, so that the refractive power of the second lens and the third lens can be effectively adjusted, the phenomenon that an incident beam is diffused by the first lens and greatly expanded is effectively inhibited, the convergence effect of a lens group on the image side of the third lens is not required to be excessively enhanced, the system can be prevented from generating large aberration, in addition, the wide-angle and small-size design of the system is favorably realized, and the optical performance of the system is improved. In particular, when the lower limit condition of the above relationship is satisfied, the incident light beam can be sufficiently diverged by the second lens element and the third lens element to enter the fourth lens element having positive refractive power, and thus an intensive light lens system can be easily achieved.

In one embodiment, the optical system satisfies the following relationship:

1.9≤f4/CT4≤3；

wherein f4 is the effective focal length of the fourth lens element, and CT4 is the thickness of the fourth lens element on the optical axis. The change of the center thickness of the fourth lens can affect the effective focal length of the optical system, and when the relation is satisfied, the center thickness of the fourth lens and the effective focal length of the optical system can be reasonably configured, so that the tolerance sensitivity of the center thickness of the fourth lens can be reduced, the difficulty of the processing technology of the lens can be reduced, the assembly yield of the lens group can be improved, and the production cost can be further reduced. When the upper limit of the relational expression is exceeded, the optical system is too sensitive to the central thickness of the fourth lens, and the processing of the lens is difficult to meet the required tolerance requirement, so that the production yield of the lens is reduced, and the production cost is not facilitated; if the thickness of the center of the fourth lens is less than the lower limit of the above relationship, the thickness of the center of the fourth lens is too large, and if the lens is made of glass, the density of the glass lenses is large, so that the weight of the lens is increased as the thickness of the center of the lens is increased, which is disadvantageous for the light weight design of the optical system.

In one embodiment, the optical system satisfies the following relationship:

3≤f56/(CT5-CT6)≤49；

wherein f56 is a combined focal length of the fifth lens element and the sixth lens element, CT5 is an optical thickness of the fifth lens element, and CT6 is an optical thickness of the sixth lens element. When the above relationship is satisfied, the refractive powers of the fifth lens element and the sixth lens element can be reasonably matched, so that the aberration can be mutually corrected, and the aberration caused by a lens group consisting of the fifth lens element and the sixth lens element can be favorably reduced. When the thickness difference between the centers of the fifth lens and the sixth lens is lower than the lower limit of the relational expression, the gluing process is not facilitated due to overlarge thickness difference, and meanwhile, the phenomena of glue cracking, glue removing and the like are easily caused due to large difference of cold and hot deformation caused by the thickness difference in the environment with large change of high and low temperature environments; when the focal length of the fifth lens element is larger than the upper limit of the relational expression, the combined focal length of the fifth lens element and the sixth lens element is too large, which is likely to generate a severe astigmatism phenomenon, and is not favorable for improving the imaging quality.

In one embodiment, the optical system satisfies the following relationship:

10≤TTL/f≤12；

wherein f is an effective focal length of the optical system. When the above relationship is satisfied, the miniaturization design of the optical system can be satisfied. When the upper limit of the relational expression is exceeded, the total length of the optical system is too long, which is not beneficial to miniaturization; when the effective focal length is lower than the lower limit of the relational expression, the effective focal length of the optical system is too long, which is not favorable for the large-viewing-angle design of the optical system.

In one embodiment, the optical system satisfies the following relationship:

Vd5-Vd6≤36；

wherein Vd5 is the Abbe number of the fifth lens, and Vd6 is the Abbe number of the sixth lens. When the relation is satisfied, reasonable collocation of materials can be realized, chromatic aberration of the system is reduced, and the optical system has good imaging quality.

In one embodiment, the diaphragm is disposed between the third lens and the fourth lens.

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. Through adopting above-mentioned optical system, the module of making a video recording can optimize the aberration well equally to reduce the production of ghost, thereby possess good formation of image quality.

An electronic device comprises a fixing piece and the camera module, wherein the camera module is arranged on the fixing piece. Through adopting above-mentioned module of making a video recording, electronic equipment's the quality of making a video recording can be effectively improved.

An automobile comprises an installation part and the electronic equipment, wherein the electronic equipment is arranged on the installation part. By adopting the electronic equipment, the automobile can obtain high-quality imaging pictures, so that the driving safety is improved.

Drawings

Fig. 1 is a schematic structural diagram of an optical system according to a first embodiment of the present application;

FIG. 2 includes a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system in the first embodiment;

fig. 3 is a schematic structural diagram of an optical system according to a second embodiment of the present application;

FIG. 4 includes a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system in the second embodiment;

fig. 5 is a schematic structural diagram of an optical system according to a third embodiment of the present application;

FIG. 6 includes a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system in the third embodiment;

fig. 7 is a schematic structural diagram of an optical system according to a fourth embodiment of the present application;

FIG. 8 includes a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system in the fourth embodiment;

fig. 9 is a schematic structural diagram of an optical system according to a fifth embodiment of the present application;

FIG. 10 includes a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system in the fifth embodiment;

fig. 11 is a schematic structural diagram of an optical system according to a sixth embodiment of the present application;

FIG. 12 includes a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system in the sixth embodiment;

fig. 13 is a schematic structural diagram of an optical system according to a seventh embodiment of the present application;

FIG. 14 includes a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system in the seventh embodiment;

fig. 15 is a schematic view of a camera module according to an embodiment of the present application;

fig. 16 is a schematic diagram of an electronic device provided in an embodiment of the present application;

fig. 17 is a schematic view of an automobile 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, an embodiment of the present application provides an optical system 10, where the optical system 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 fourth lens L4, a fifth lens L5, and a sixth lens L6. 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. In addition, the optical system 10 further includes a stop STO provided between two adjacent lenses of the optical system 10. Each lens in the optical system 10 is arranged 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 optical system 10. The lenses and stop STO of the optical system 10 may be mounted to a lens barrel to be assembled to form an imaging lens.

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 optical system 10 further has a virtual image plane S17, and the image plane S17 is located on the image side of the sixth lens element L6. Generally, the image forming surface S17 of the optical system 10 coincides with the photosensitive surface of the photosensitive element, which can be regarded as the image forming surface S17 of the optical system 10 for ease of understanding.

In these embodiments, the object-side surface S1 of the first lens element L1 is convex, and the image-side surface S2 is concave; the image-side surface S4 of the second lens element L2 is concave; the image-side surface S6 of the third lens element L3 is convex; the image-side surface S8 of the fourth lens element L4 is convex; the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are convex; the object-side surface S11 of the sixth lens element L6 is concave. In the embodiment of the present application, 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, and the object-side surfaces and/or the image-side surfaces of at least two lens elements in the optical system 10 are aspheric, i.e., the object-side surfaces and/or the image-side surfaces of at least two lens elements in the first lens element L1 to the sixth lens element L6 are aspheric.

In addition, in these embodiments, the optical system 10 satisfies the relationship:

TTL/EPL is more than or equal to 1.8 and less than or equal to 1.99; wherein, TTL is an axial distance from the object-side surface S1 of the first lens element L1 to the image plane S17 of the optical system 10, and EPL is an axial distance from the stop STO to the image plane S17 of the optical system 10. Specifically, in some embodiments, the TTL/EPL may be 1.82, 1.85, 1.87, 1.9, 1.92, 1.95, or 1.98.

In the above optical system 10, the position of the stop STO compared with the system imaging surface S17 can be reasonably set, so that the stop STO is reasonably far away from the imaging surface S17, and the marginal incident beams are eliminated to a certain extent, thereby reducing the incident angle of the chief rays of each field on the system imaging surface S17, enabling the chief rays of different fields to be incident on the imaging surface S17 of the optical system 10 in a nearly perpendicular manner, and further enabling the optical system 10 to have good telecentric characteristics. Further, when the optical system 10 has a good telecentric property, the optical system 10 and the photosensitive element can form a good fit, so that the incident light beam is incident to the photosensitive surface in a nearly vertical manner, thereby improving the photosensitive sensitivity of the photosensitive element, reducing the possibility of generating a dark angle by the system, and further improving the imaging quality of the system. When the upper limit of the above relationship is exceeded, it is not favorable to limit the total length of the optical system 10 and to realize a compact design; when the distance is less than the lower limit of the above relational expression, the distance from the diaphragm STO to the system image plane S17 is too long, which is not favorable for the system to realize the telecentric characteristic.

In some embodiments, the object-side surface and the image-side surface of each lens in the optical system 10 are aspheric, and the aspheric design enables the object-side surface and/or the image-side surface of each lens to have a more flexible design, so that the lens can well solve the undesirable phenomena of poor imaging, distorted field of view, narrow field of view and the like under the condition of being small and thin, and thus the system can have good imaging quality without arranging too many lenses, and the length of the optical system 10 can be shortened. In some embodiments, the object-side surface and the image-side surface of each lens in the optical system 10 are both spherical surfaces, and the spherical lenses are simple in manufacturing process and low in production cost. In some embodiments, the object-side surface and/or the image-side surface of at least one lens of the optical system 10 is aspheric, and the object-side surface and/or the image-side surface of at least one lens is spherical. The aberration of the system can be effectively eliminated by the cooperation of the spherical surface and the aspherical surface, so that the optical system 10 has good imaging quality, and simultaneously, the flexibility of lens design and assembly is improved, and the system is balanced between high imaging quality and low cost. The specific configuration of the spherical surface and the aspherical surface depends on the actual design requirement, and will not be described herein. It is further noted that the specific shapes of the spherical and aspherical surfaces in the embodiments are not limited to those shown in the drawings, which are mainly for exemplary reference and are not drawn to scale.

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

z is the distance from a corresponding point on the aspheric surface to a 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 a conical coefficient, and Ai is a coefficient corresponding to the ith high-order term in the aspheric surface type formula.

In some embodiments, each lens in the optical system 10 is made of glass, and the glass lens can withstand higher temperature and has excellent optical effect. In some embodiments, the material of each lens in the optical system 10 is plastic, and the plastic lens can reduce the weight of the optical system 10 and reduce the manufacturing cost. In other embodiments, the first lens L1 is made of glass, and other lenses in the optical system 10 are made of plastic, and at this time, since the lens in the optical system 10 located at the object side is made of glass, these glass lenses located at the object side have a good tolerance effect to extreme environments, and are not susceptible to aging and the like caused by the object side environment, so that when the optical system 10 is in extreme environments such as exposure to high temperature, the structure can better balance the optical performance and cost of the system. Of course, the configuration relationship of the lens materials in the optical system 10 is not limited to the above embodiments, any one of the lenses may be made of plastic or glass, and the specific configuration relationship is determined according to the actual design requirement, which is not described herein again.

In some embodiments, the optical system 10 includes a filter 110, and the filter 110 is disposed on the image side of the sixth lens L6 and is fixed relative to each lens in the optical system 10. The filter 110 is an infrared cut filter for filtering infrared light, and prevents the infrared light from reaching the imaging surface S17 of the system, so as to prevent the infrared light from interfering with normal imaging. The filter 110 may be assembled with each lens as part of the optical system 10. For example, in some embodiments, each lens in the optical system 10 is mounted within a lens barrel, and the filter 110 is mounted at the image end of the lens barrel. In other embodiments, the filter 110 is not a component of the optical system 10, and the filter 110 can be installed between the optical system 10 and the photosensitive element when the optical system 10 and the photosensitive element are assembled into a camera module. In some embodiments, the optical filter 110 may also be disposed on the object side of the first lens L1. In addition, in some embodiments, the filter 110 may not be provided, and an infrared filter is provided on an object-side surface or an image-side surface of one of the first lens L1 through the sixth lens L6 to filter infrared light.

In some embodiments, the optical system 10 further satisfies at least one of the following relationships, and when any one of the relationships is satisfied, the optical system 10 has the effect described by the corresponding relationship:

53 degrees is more than or equal to (FOV f)/Imgh is more than or equal to 62 degrees; where FOV is the maximum angle of view of the optical system 10, f is the effective focal length of the optical system 10, and Imgh is the image height corresponding to the maximum angle of view of the optical system 10. Generally, when the light receiving element is mounted on the image side of the optical system 10, the image forming surface S17 of the optical system 10 overlaps the light receiving surface of the light receiving element, the shape of the light receiving surface is rectangular, the maximum angle of view of the light receiving surface in the longitudinal direction is the maximum angle of view FOV of the optical system 10, and the length of the light receiving surface is the image height Imgh corresponding to the maximum angle of view of the optical system 10. In particular, (FOV x f)/Imgh in some embodiments may be 53.5 °, 54 °, 55 °, 56 °, 57 °, 58 °, 59 °, 60 °, or 61 °. When the above relationship is satisfied, the image height of the optical system 10 is in a proper proportional relationship with the viewing angle, so that a sufficient viewing angle can be provided for the system, the system has a wide-angle characteristic, and simultaneously, the incident angle of the incident light rays to the photosensitive element can be reduced, so as to improve the photosensitive performance of the photosensitive element. When the distance is lower than the lower limit of the relational expression, the field angle of the system is insufficient, and enough object space information cannot be obtained; if the upper limit of the relational expression is exceeded, the amount of light transmitted through the system is insufficient, and the requirement for high-definition shooting cannot be satisfied.

F1/R2 is more than or equal to-2.3 and less than or equal to-1.9; wherein f1 is the effective focal length of the first lens element L1, and R2 is the radius of curvature of the image-side surface S2 of the first lens element L1 on the optical axis. Specifically, f1/R2 in some embodiments can be-2.25, -2.2, -2.15, -2.1, -2.05, or-2. When the above relationship is satisfied, the degree of curvature of the image-side surface S2 of the first lens element L1 can be controlled appropriately, and the risk of occurrence of ghost images can be reduced. On the other hand, when the image-side surface S2 of the first lens L1 has a small radius of curvature, it is advantageous for the wide-angle design of the system, and by satisfying the above relationship, the radius of curvature of the image-side surface S2 of the first lens L1 can be prevented from being excessively small, so that the strong divergent action of the light flux in the peripheral field can be suppressed, and the generation of high-order aberration can be suppressed.

D1/f is more than or equal to 1 and less than or equal to 1.8; where d1 is the distance on the optical axis from the image-side surface S2 of the first lens element L1 to the object-side surface S3 of the second lens element L2, and f is the effective focal length of the optical system 10. Specifically, d1/f in some embodiments may be 1.2, 1.25, 1.3, 1.35, 1.5, 1.6, 1.65, 1.7, or 1.75. When the above relationship is satisfied, the distance between the first lens L1 and the second lens L2 can be set reasonably, the phenomenon that the incident beam diverges and expands greatly through the first lens L1 can be effectively suppressed, and the converging action of the lens group on the image side of the second lens L2 does not need to be strengthened excessively, so that the system can be prevented from generating large aberration. When the lower limit condition of the relationship is satisfied, the incident light beam can be fully diverged after passing through the first lens L1 and then enters the second lens L2, so that the ultra-wide angle performance of the system is favorably realized; when the upper limit condition is satisfied, the distance between the first lens L1 and the second lens L2 is set reasonably and is not too large, so that the assembly yield of the lenses can be improved, and the generation of stray light is reduced.

The stop STO is disposed between the third lens L3 and the fourth lens L4, and the optical system 10 satisfies the relationship: f3/f is more than or equal to 3 and less than or equal to 6; where f3 is the effective focal length of the third lens L3, and f is the effective focal length of the optical system 10. Specifically, some embodiments may have f3/f of 3.2, 3.3, 3.5, 3.8, 4, 4.5, 4.8, 5, 5.2, 5.5, 5.8, or 5.9. When the above relationship is satisfied, the third lens L3 can favorably converge the light beams diverged by the first lens L1 and the second lens L2, so that the distance between the third lens L3 and the stop STO is reduced, which is advantageous for realizing a compact design of the optical system 10. Further, when the above relationship is satisfied, the third lens L3 has a sufficient refractive power, so that the burden of the light beam converging action on the fourth lens L4 can be reduced.

R5-R6I/d 3 is more than or equal to 6 and less than or equal to 35; wherein R5 is a curvature radius of the object-side surface S5 of the third lens element L3 along the optical axis, R6 is a curvature radius of the image-side surface S6 of the third lens element L3 along the optical axis, and d3 is a distance between the image-side surface S6 of the third lens element L3 and the object-side surface S7 of the fourth lens element L4 along the optical axis. In particular, some embodiments of | R5-R6|/d3 may be 7, 8, 9, 10, 13, 15, 16, 25, 30, 33, or 34. When the above relationship is satisfied, the surface shapes of the object-side surface S5 and the image-side surface S6 of the third lens L3 tend to be gentle, and the deviations of the incident angle and the exit angle of the light rays with different fields of view can be reduced, thereby reducing the sensitivity and being beneficial to reducing the generation of ghost images. When the distance is less than the lower limit of the relational expression, the air gap between the third lens L3 and the fourth lens L4 is too large, which is not favorable for improving the assembly yield, is also easy to generate ghost, and is not favorable for the miniaturization design of the system. Above the upper limit of the relationship, the curvature radius of the object-side surface S5 of the third lens element L3 is too large, which is not favorable for reducing the risk of occurrence of ghost image.

Furthermore, the absolute value of R5-R6/d 3 is more than or equal to 6 and less than or equal to 16. When the relationship is satisfied, better balance can be obtained between the reduction of ghost generation and the system miniaturization design.

(CT2+ CT3)/f is more than or equal to 1.3 and less than or equal to 2.4; wherein CT2 is the thickness of the second lens element L2 on the optical axis, CT3 is the thickness of the third lens element L3 on the optical axis, and f is the effective focal length of the optical system 10. Specifically, (CT2+ CT3)/f for some embodiments may be 1.4, 1.5, 1.7, 1.9, 2, 2.1, 2.2, or 2.3. The refractive power of the lens is closely related to the thickness, and when the above relationship is satisfied, the central thicknesses of the second lens L2 and the third lens L3 can be reasonably set, so that the refractive powers of the second lens L2 and the third lens L3 can be effectively adjusted, the phenomenon that an incident light beam diverges through the first lens L1 and is greatly expanded is effectively inhibited, the convergence effect of a lens group on the image side of the third lens L3 does not need to be excessively enhanced, the system can be prevented from generating large aberration, the wide-angle and small-size design of the system can be realized, and the optical performance of the system is improved. In particular, when the lower limit condition of the above relationship is satisfied, the incident light flux can be sufficiently diverged to enter the fourth lens L4 having a positive refractive power through the second lens L2 and the third lens L3, and thus an intensive light lens system is easily achieved.

F4/CT4 is more than or equal to 1.9 and less than or equal to 3; wherein f4 is the effective focal length of the fourth lens L4, and CT4 is the thickness of the fourth lens L4 on the optical axis. In particular, some embodiments of f4/CT4 may be 2, 2.1, 2.2, 2.3, 2.5, 2.7, 2.8, or 2.9. The effective focal length of the optical system 10 is affected by the change of the central thickness of the fourth lens element L4, and when the above relationship is satisfied, the central thickness of the fourth lens element L4 and the effective focal length of the optical system 10 can be reasonably configured, so that the tolerance sensitivity of the central thickness of the fourth lens element L4 can be reduced, the difficulty of the lens processing process can be reduced, the assembly yield of the lens assembly can be improved, and the production cost can be further reduced. When the upper limit of the relation is exceeded, the optical system 10 is too sensitive to the central thickness of the fourth lens L4, and the processing of the lens is difficult to meet the required tolerance requirement, so that the production yield of the lens is reduced, and the production cost is not favorable; if the thickness is less than the lower limit of the above relationship, the central thickness of the fourth lens L4 becomes too large, and if the lens is made of glass, the density of glass lenses is large, so that the weight of the lens increases as the central thickness of the lens increases, which is disadvantageous for the lightweight design of the optical system 10.

F56/(CT5-CT6) is more than or equal to 3 and less than or equal to 49; wherein f56 is a combined focal length of the fifth lens element L5 and the sixth lens element L6, CT5 is an optical thickness of the fifth lens element L5, and CT6 is an optical thickness of the sixth lens element L6. In particular, some embodiments may have f56/(CT5-CT6) of 4, 5, 7, 9, 14, 15, 20, 35, 40, 45, 47, or 48. When the above relationship is satisfied, the refractive powers of the fifth lens element L5 and the sixth lens element L6 can be reasonably matched, so that the aberration can be mutually corrected, and the aberration caused by the lens assembly formed by the fifth lens element L5 and the sixth lens element L6 can be reduced. When the thickness difference between the centers of the fifth lens L5 and the sixth lens L6 is too large below the lower limit of the relational expression, the gluing process is not facilitated, and meanwhile, in an environment with large variation of high and low temperature environments, the cold and hot deformation difference generated by the thickness difference is large, and phenomena such as glue crack and glue failure are easy to generate; if the focal length of the combination of the fifth lens element L5 and the sixth lens element L6 is too large, the astigmatism tends to be severe, which is not favorable for improving the image quality.

TTL/f is more than or equal to 10 and less than or equal to 12; where f is the effective focal length of the optical system 10. Specifically, some embodiments may have a TTL/f of 10.2, 10.4, 10.6, 11, 11.2, 11.4, 11.5, or 11.6. When the above relationship is satisfied, the miniaturization design of the optical system 10 can be satisfied. When the upper limit of the relational expression is exceeded, the total length of the optical system 10 is too long, which is not favorable for miniaturization; if the effective focal length is less than the lower limit of the relational expression, the effective focal length of the optical system 10 is too long, which is not favorable for satisfying the field angle range of the optical system 10.

Vd5-Vd6 is less than or equal to 36; vd5 is the abbe number of the fifth lens L5, and Vd6 is the abbe number of the sixth lens L6. Specifically, some embodiments may have Vd5-Vd6 of 31.5, 32, 32.5, 33, 33.5, 34, 34.5, or 35. When the above relation is satisfied, reasonable matching of materials can be realized, chromatic aberration of the system is reduced, and the optical system 10 has good imaging quality.

In particular, the optical system 10 is applicable to an in-vehicle image pickup apparatus. The existing ultra-wide-angle camera lens is difficult to simultaneously meet large-angle shooting and clear imaging, so that a vehicle-mounted system is difficult to make real-time and accurate early warning through pictures obtained by the wide-angle camera lenses, and further the driving risk is caused. In the conventional lens, in order to obtain a larger field angle, the wide-angle lens is often assembled by matching a plurality of lenses, so that the size of the wide-angle lens is generally larger. However, in the embodiments provided in the present application, the refractive power and the surface shape of each lens in the optical system 10 can be reasonably matched, and the optical system 10 in some embodiments satisfies the above relation conditions, so that the characteristics of small number of lenses, miniaturization and light weight can be realized, and good optical performance can be maintained, so that the system has the characteristics of large wide angle and high pixel.

The optical system 10 of the present application is described in more detail with reference to the following examples:

first embodiment

Referring to fig. 1, in the first embodiment, the optical system 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, an astigmatism diagram, and a distortion diagram of the optical system 10 in the first embodiment. The reference wavelength of the astigmatism and distortion plots is 587.56 nm.

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

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

The object-side and image-side surfaces of the first lens L1, the second lens L2, the fifth lens L6, and the fourth lens L2 are all spherical surfaces, and the object-side and image-side surfaces of the third lens L2 and the fourth lens L4 are all aspherical surfaces. The aberration of the system can be effectively eliminated by the cooperation of the spherical surface and the aspherical surface, so that the optical system 10 has good imaging quality, and simultaneously, the flexibility of lens design and assembly is improved, and the system is balanced between high imaging quality and low cost. In addition, the image-side surface S10 of the fifth lens L5 is cemented with the object-side surface S11 of the sixth lens L6, so that the fifth lens L5 and the sixth lens L6 constitute a cemented lens. The lenses (the first lens L1 to the sixth lens L6) in the optical system 10 are made of glass.

In the first embodiment, the optical system 10 satisfies the following relationships:

TTL/EPL 1.949; wherein, TTL is an axial distance from the object-side surface S1 of the first lens element L1 to the image plane S17 of the optical system 10, and EPL is an axial distance from the stop STO to the image plane S17 of the optical system 10.

When the above configuration is satisfied, the position of the stop STO compared with the system imaging surface S17 can be reasonably set, so that the stop STO is reasonably far away from the imaging surface S17, and the marginal incident beams are eliminated to a certain extent, thereby depressing the incident angle of the chief rays of each field on the system imaging surface S17, so that the chief rays of different fields can be incident on the imaging surface S17 of the optical system 10 in a nearly perpendicular manner, and further the optical system 10 has a good telecentric characteristic. Further, when the optical system 10 has a good telecentric property, the optical system 10 and the photosensitive element can form a good fit, so that the incident light beam is incident to the photosensitive surface in a nearly vertical manner, thereby improving the photosensitive sensitivity of the photosensitive element, reducing the possibility of generating a dark angle by the system, and further improving the imaging quality of the system.

(FOV x f)/Imgh 60.721 °; where FOV is the maximum angle of view of the optical system 10, f is the effective focal length of the optical system 10, and Imgh is the image height corresponding to the maximum angle of view of the optical system 10. Wherein the horizontal direction of the optical system 10 is parallel to the length direction of the photosensitive chip. When the above relationship is satisfied, the image height of the optical system 10 is in a proper proportional relationship with the viewing angle, so that a sufficient viewing angle can be provided for the system, the system has a wide-angle characteristic, and simultaneously, the incident angle of the incident light rays to the photosensitive element can be reduced, so as to improve the photosensitive performance of the photosensitive element.

f1/R2 ═ -1.962; wherein f1 is the effective focal length of the first lens element L1, and R2 is the radius of curvature of the image-side surface S2 of the first lens element L1 on the optical axis. When the above relationship is satisfied, the degree of curvature of the image-side surface S2 of the first lens element L1 can be controlled appropriately, and the risk of occurrence of ghost images can be reduced. On the other hand, when the image-side surface S2 of the first lens L1 has a small radius of curvature, it is advantageous for the wide-angle design of the system, and by satisfying the above relationship, the radius of curvature of the image-side surface S2 of the first lens L1 can be prevented from being excessively small, so that the strong divergent action of the light flux in the peripheral field can be suppressed, and the generation of high-order aberration can be suppressed.

d1/f is 1.536; where d1 is the distance on the optical axis from the image-side surface S2 of the first lens element L1 to the object-side surface S3 of the second lens element L2, and f is the effective focal length of the optical system 10. When the above relationship is satisfied, the distance between the first lens L1 and the second lens L2 can be set reasonably, the phenomenon that the incident beam diverges and expands greatly through the first lens L1 can be effectively suppressed, and the converging action of the lens group on the image side of the second lens L2 does not need to be strengthened excessively, so that the system can be prevented from generating large aberration. In addition, the incident light beam can be sufficiently diverged after passing through the first lens L1 and then enters the second lens L2, which is beneficial to achieving ultra-wide angle performance of the system. In addition, the distance between the first lens L1 and the second lens L2 is reasonable and not too large, so that the assembly yield of the lenses can be improved, and the generation of stray light is reduced

The stop STO is disposed between the third lens L3 and the fourth lens L4, and the optical system 10 in this embodiment satisfies the relationship: f3/f 3.183; where f3 is the effective focal length of the third lens L3, and f is the effective focal length of the optical system 10. When the above relationship is satisfied, the third lens L3 can favorably converge the light beams diverged by the first lens L1 and the second lens L2, so that the distance between the third lens L3 and the stop STO is reduced, which is advantageous for realizing a compact design of the optical system 10. Further, when the above relationship is satisfied, the third lens L3 has a sufficient refractive power, so that the burden of the light beam converging action on the fourth lens L4 can be reduced.

R5-R6/d 3 ═ 15.402; wherein R5 is a curvature radius of the object-side surface S5 of the third lens element L3 along the optical axis, R6 is a curvature radius of the image-side surface S6 of the third lens element L3 along the optical axis, and d3 is a distance between the image-side surface S6 of the third lens element L3 and the object-side surface S7 of the fourth lens element L4 along the optical axis. When the above relationship is satisfied, the surface shapes of the object-side surface S5 and the image-side surface S6 of the third lens L3 tend to be gentle, and the deviations of the incident angle and the exit angle of the light rays with different fields of view can be reduced, thereby reducing the sensitivity and being beneficial to reducing the generation of ghost images. When the distance is less than the lower limit of the relational expression, the air gap between the third lens L3 and the fourth lens L4 is too large, which is not favorable for improving the assembly yield, is also easy to generate ghost, and is not favorable for the miniaturization design of the system. Above the upper limit of the relationship, the curvature radius of the object-side surface S5 of the third lens element L3 is too large, which is not favorable for reducing the risk of occurrence of ghost image. In addition, since 6 ≦ R5-R6|/d3 ≦ 16 is satisfied, the optical system 10 can achieve a better balance between reduction of ghost generation and system miniaturization design.

(CT2+ CT3)/f 1.926; wherein CT2 is the thickness of the second lens element L2 on the optical axis, CT3 is the thickness of the third lens element L3 on the optical axis, and f is the effective focal length of the optical system 10. The refractive power of the lens is closely related to the thickness, and when the above relationship is satisfied, the central thicknesses of the second lens L2 and the third lens L3 can be reasonably set, so that the refractive powers of the second lens L2 and the third lens L3 can be effectively adjusted, the phenomenon that an incident light beam diverges through the first lens L1 and is greatly expanded is effectively inhibited, the convergence effect of a lens group on the image side of the third lens L3 does not need to be excessively enhanced, the system can be prevented from generating large aberration, the wide-angle and small-size design of the system can be realized, and the optical performance of the system is improved. In particular, when the lower limit condition of the above relationship is satisfied, the incident light flux can be sufficiently diverged to enter the fourth lens L4 having a positive refractive power through the second lens L2 and the third lens L3, and thus an intensive light lens system is easily achieved.

f4/CT4 ═ 2.372; wherein f4 is the effective focal length of the fourth lens L4, and CT4 is the thickness of the fourth lens L4 on the optical axis. The effective focal length of the optical system 10 is affected by the change of the central thickness of the fourth lens element L4, and when the above relationship is satisfied, the central thickness of the fourth lens element L4 and the effective focal length of the optical system 10 can be reasonably configured, so that the tolerance sensitivity of the central thickness of the fourth lens element L4 can be reduced, the difficulty of the lens processing process can be reduced, the assembly yield of the lens assembly can be improved, and the production cost can be further reduced.

f56/(CT5-CT6) ═ 14.922; wherein f56 is a combined focal length of the fifth lens element L5 and the sixth lens element L6, CT5 is an optical thickness of the fifth lens element L5, and CT6 is an optical thickness of the sixth lens element L6. When the above relationship is satisfied, the refractive powers of the fifth lens element L5 and the sixth lens element L6 can be reasonably matched, so that the aberration can be mutually corrected, and the aberration caused by the lens assembly formed by the fifth lens element L5 and the sixth lens element L6 can be favorably reduced.

TTL/f is 10.412; where f is the effective focal length of the optical system 10. When the above relationship is satisfied, the miniaturization design of the optical system 10 can be satisfied.

Vd5-Vd6 is 32.174; when Vd5 is the abbe number of the fifth lens L5 and Vd6 is the abbe number of the sixth lens L6, which satisfy the above relationship, a reasonable material matching can be achieved, and chromatic aberration of the system is reduced, so that the optical system 10 has good imaging quality.

In addition, each lens parameter of the optical system 10 is given by table 1 and table 2. Table 2 shows the aspherical coefficients of the corresponding lens surfaces in table 1, where K is a conic coefficient and Ai is a coefficient corresponding to the i-th high-order term in the aspherical surface formula. The elements from the object side to the image side are arranged in the order of the elements from the top to the bottom in table 1, and the image plane (image forming plane S17) can be understood as the photosensitive surface of the photosensitive element at the later stage when the photosensitive element is assembled. The surface numbers 1 and 2 correspond to the object-side surface S1 and the image-side surface S2 of the first lens L1, respectively, that is, in the same lens, 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. The Y radius in table 1 is the radius of curvature of the object-side surface or the image-side surface of the corresponding surface number at the optical axis. The first value of the "thickness" parameter set of the lens is the thickness of the lens on the optical axis, the second value is the distance from the image-side surface of the lens to the object-side surface of the next optical element on the optical axis, and when the next optical element of the lens is the stop STO, the second value represents the distance from the image-side surface of the lens to the center of the stop STO on the optical axis. The numerical value of stop STO in the "thickness" parameter column is the distance on the optical axis from the center of stop STO to the object-side surface of the subsequent lens. The optical axes of the lenses in the embodiment of the present application are on the same straight line as the optical axis of the optical system 10. The reference wavelength of the refractive index, Abbe number and focal length in the following examples was 587.56 nm. The relational expression calculation and the lens structure in each example are based on data in the basic parameter tables such as table 1 and table 2.

In the first embodiment, the effective focal length f of the optical system 10 is 1.70 mm; f-number FNO is 2.1; the maximum horizontal viewing angle FOV is 200 °. Since the photosensitive element is generally rectangular in configuration, the horizontal direction of the optical system 10 is parallel to the lengthwise direction of the photosensitive element; the total optical length TTL is 17.7mm, which is the distance on the optical axis from the object-side surface S1 of the first lens element L1 to the image plane S17 of the system.

TABLE 1

TABLE 2

Number of noodles	5	6	8	9
					K	0.00E+00	0.00E+00	3.29E+01	2.17E-01
A4	1.22E-03	1.86E-03	-5.80E-04	4.06E-03
					A6	9.97E-05	-5.86E-04	-6.22E-02	-4.71E-03
A8	0.00E+00	0.00E+00	2.47E-01	8.19E-03
					A10	0.00E+00	0.00E+00	-6.01E-01	-7.87E-03
A12	0.00E+00	0.00E+00	9.14E-01	4.61E-03
					A14	0.00E+00	0.00E+00	-8.82E-01	-1.66E-03
A16	0.00E+00	0.00E+00	5.24E-01	3.60E-04
					A18	0.00E+00	0.00E+00	-1.75E-01	-4.31E-05
A20	0.00E+00	0.00E+00	2.51E-02	2.18E-06

Second embodiment

Referring to fig. 3, in the second embodiment, the optical system 10 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, the fifth lens element L5 with positive refractive power, and the sixth lens element L6 with negative refractive power. Fig. 4 includes a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system 10 in the second embodiment. The reference wavelength of the astigmatism and distortion plots is 587.56 nm.

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

In addition, the lens parameters in the second embodiment are given 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

Number of noodles	5	6	8	9
					K	-9.90E+01	-1.40E-01	9.24E+01	4.24E-01
A4	3.01E-03	-1.10E-04	-1.46E-02	3.81E-03
					A6	-6.30E-04	-1.95E-04	-5.16E-03	-3.04E-03
A8	1.01E-04	-2.47E-07	5.83E-03	4.78E-03
					A10	-9.57E-06	-3.62E-06	-4.89E-03	-4.35E-03
A12	-2.34E-20	0.00E+00	-5.18E-03	2.56E-03
					A14	0.00E+00	0.00E+00	1.19E-02	-9.75E-04
A16	0.00E+00	0.00E+00	-8.92E-03	2.34E-04
					A18	0.00E+00	0.00E+00	3.08E-03	-3.22E-05
A20	0.00E+00	0.00E+00	-4.20E-04	1.94E-06

The optical system 10 in this embodiment satisfies the following relationship:

third embodiment

Referring to fig. 5, in the third embodiment, the optical system 10 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, the fifth lens element L5 with positive refractive power, and the sixth lens element L6 with negative refractive power. Fig. 6 includes a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system 10 in the third embodiment. The reference wavelength of the astigmatism and distortion plots is 587.56 nm.

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

In addition, the lens parameters in the third embodiment are given 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

Number of noodles	5	6	8	9
					K	0.00E+00	-1.56E+00	3.08E+01	0.00E+00
A4	0.00E+00	4.31E-03	-1.85E-02	0.00E+00
					A6	0.00E+00	-1.36E-03	-5.59E-03	0.00E+00
A8	0.00E+00	2.40E-04	1.06E-02	0.00E+00
					A10	0.00E+00	-2.58E-05	-2.10E-02	0.00E+00
A12	0.00E+00	0.00E+00	1.53E-02	0.00E+00
					A14	0.00E+00	0.00E+00	-4.58E-03	0.00E+00
A16	0.00E+00	0.00E+00	0.00E+00	0.00E+00
					A18	0.00E+00	0.00E+00	0.00E+00	0.00E+00
A20	0.00E+00	0.00E+00	0.00E+00	0.00E+00

The optical system 10 in this embodiment satisfies the following relationship:

f1/R2	-2.048	f56/(CT5-CT6)	48.662
				d1/f	1.758	TTL/f	11.367
f3/f	3.485	Vd5-Vd6	34.562
				\|R5-R6\|/d3	6.65	(FOV*f)/Imgh	54.868
(CT2+CT3)/f	2.175	TTL/EPL	1.986
				f4/CT4	2.022

fourth embodiment

In the fourth embodiment, referring to fig. 7, the optical system 10 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, the fifth lens element L5 with positive refractive power, and the sixth lens element L6 with negative refractive power. Fig. 8 includes a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system 10 in the fourth embodiment. The reference wavelength of the astigmatism and distortion plots is 587.56 nm.

In addition, the lens parameters in the fourth embodiment are given in tables 7 and 8, wherein the definitions of the structures and parameters can be obtained from the first embodiment, which is not repeated herein.

TABLE 7

TABLE 8

Number of noodles	5	6	8	9
					K	0.00E+00	-3.52E+01	2.17E+01	0.00E+00
A4	0.00E+00	-8.00E-03	-1.74E-02	0.00E+00
					A6	0.00E+00	2.05E-03	-1.06E-02	0.00E+00
A8	0.00E+00	-4.37E-04	2.20E-02	0.00E+00
					A10	0.00E+00	4.04E-05	-3.56E-02	0.00E+00
A12	0.00E+00	0.00E+00	2.50E-02	0.00E+00
					A14	0.00E+00	0.00E+00	-7.26E-03	0.00E+00
A16	0.00E+00	0.00E+00	0.00E+00	0.00E+00
					A18	0.00E+00	0.00E+00	0.00E+00	0.00E+00
A20	0.00E+00	0.00E+00	0.00E+00	0.00E+00

The optical system 10 in this embodiment satisfies the following relationship:

f1/R2	-2.048	f56/(CT5-CT6)	38.057
				d1/f	1.788	TTL/f	11.595
f3/f	3.496	Vd5-Vd6	35.353
				\|R5-R6\|/d3	7.05	(FOV*f)/Imgh	53.736
(CT2+CT3)/f	2.378	TTL/EPL	1.973
				f4/CT4	1.989

fifth embodiment

Referring to fig. 9, in the fifth embodiment, the optical system 10 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, the fifth lens element L5 with positive refractive power, and the sixth lens element L6 with negative refractive power. Fig. 10 includes a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system 10 in the fifth embodiment. The reference wavelength for the astigmatism and distortion plots is 546.07 nm.

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

In addition, the lens parameters 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 repeated herein.

TABLE 9

Watch 10

Number of noodles	3	4	8	9
					K	-9.16E-01	-1.58E+00	9.90E+01	5.09E-01
A4	-1.02E-03	1.04E-02	-1.38E-02	3.71E-03
					A6	-1.61E-05	-6.32E-04	-3.60E-03	0.00E+00
A8	1.08E-06	0.00E+00	0.00E+00	0.00E+00
					A10	0.00E+00	0.00E+00	0.00E+00	0.00E+00
A12	0.00E+00	0.00E+00	0.00E+00	0.00E+00
					A14	0.00E+00	0.00E+00	0.00E+00	0.00E+00
A16	0.00E+00	0.00E+00	0.00E+00	0.00E+00
					A18	0.00E+00	0.00E+00	0.00E+00	0.00E+00
A20	0.00E+00	0.00E+00	0.00E+00	0.00E+00

The optical system 10 in this embodiment satisfies the following relationship:

f1/R2	-1.979	f56/(CT5-CT6)	9.671
				d1/f	1.406	TTL/f	11.679
f3/f	3.165	Vd5-Vd6	35.383
				\|R5-R6\|/d3	8.001	(FOV*f)/Imgh	53.313
(CT2+CT3)/f	2.136	TTL/EPL	1.927
				f4/CT4	2.24

sixth embodiment

Referring to fig. 11, in the sixth embodiment, the optical system 10 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, the fifth lens element L5 with positive refractive power, and the sixth lens element L6 with negative refractive power. Fig. 12 includes a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system 10 in the sixth embodiment. The reference wavelength for the astigmatism and distortion plots is 546.07 nm.

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

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

In addition, the lens parameters 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 repeated herein.

TABLE 11

TABLE 12

The optical system 10 in this embodiment satisfies the following relationship:

f1/R2	-2.283	f56/(CT5-CT6)	4.32
				d1/f	1.173	TTL/f	11.669
f3/f	5.963	Vd5-Vd6	31.385
				\|R5-R6\|/d3	8.469	(FOV*f)/Imgh	53.233
(CT2+CT3)/f	1.994	TTL/EPL	1.801
				f4/CT4	1.904

seventh embodiment

Referring to fig. 13, in the seventh embodiment, the optical system 10 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, the fifth lens element L5 with positive refractive power, and the sixth lens element L6 with negative refractive power. Fig. 14 includes a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system 10 in the seventh embodiment. The reference wavelength of the astigmatism and distortion plots is 587.56 nm.

In addition, the lens parameters in the seventh embodiment are given in tables 13 and 14, wherein the definitions of the structures and parameters can be obtained from the first embodiment, which is not described herein.

Watch 13

TABLE 14

Number of noodles	3	4	8	9
					K	-6.77E+01	1.01E+00	2.13E+01	-4.51E-01
A4	3.10E-03	2.11E-02	-1.50E-02	-2.25E-03
					A6	-2.23E-04	-7.23E-03	-2.77E-03	-2.35E-04
A8	7.56E-06	2.20E-03	-2.74E-03	-3.49E-04
					A10	-1.00E-07	-3.91E-04	-2.05E-04	1.28E-05
A12	0.00E+00	0.00E+00	0.00E+00	0.00E+00
					A14	0.00E+00	0.00E+00	0.00E+00	0.00E+00
A16	0.00E+00	0.00E+00	0.00E+00	0.00E+00
					A18	0.00E+00	0.00E+00	0.00E+00	0.00E+00
A20	0.00E+00	0.00E+00	0.00E+00	0.00E+00

The optical system 10 in this embodiment satisfies the following relationship:

f1/R2	-2.087	f56/(CT5-CT6)	3.655
				d1/f	1.341	TTL/f	10.057
f3/f	3.371	Vd5-Vd6	31.09
				\|R5-R6\|/d3	34.714	(FOV*f)/Imgh	61.786
(CT2+CT3)/f	1.988	TTL/EPL	1.868
				f4/CT4	2.081

referring to fig. 15, some embodiments of the present application further provide a camera module 20, in which the optical system 10 is assembled with the photosensitive element 210 to form the camera module 20, and the photosensitive element 210 is disposed at an image side of the optical system 10. The photosensitive element 210 may be a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor). Generally, the image forming surface S17 of the optical system 10 overlaps the photosensitive surface of the photosensitive element 210 when assembled.

In some embodiments, the camera module 20 includes a filter 110 disposed between the sixth lens L6 and the photosensitive element 210, and the filter 110 is used for filtering infrared light. In some embodiments, the filter 110 can be mounted to the image end of the lens. In some embodiments, the camera module 20 further includes a protective glass 120, the protective glass 120 is disposed between the filter 110 and the photosensitive element 210, and the protective glass 120 is used for protecting the photosensitive element 210.

By adopting the optical system 10, when the optical system 10 has good telecentric property, the optical system 10 and the photosensitive element 210 can form good adaptation, so that the photosensitive sensitivity of the photosensitive element 210 is improved, the possibility of generating dark corners by the system is reduced, and the imaging quality of the system is further improved.

Referring to fig. 16, some embodiments of the present application further provide an electronic device 30, and the camera module 20 is applied to the electronic device 30 to enable the electronic device 30 to have a camera function. Specifically, the electronic device 30 includes a fixing member 310, the camera module 20 is mounted on the fixing member 310, and the fixing member 310 may be a circuit board, a middle frame, a protective shell, or the like. The electronic device 30 may be, but is not limited to, a smart phone, a smart watch, an e-book reader, a vehicle-mounted camera device, 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 30 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 20 is installed in the middle frame of the smart phone, and the light sensing element 210 is electrically connected to the circuit board. In other embodiments, the electronic device 30 is a vehicle-mounted image capturing device (the specific structure can refer to fig. 16), the image capturing module 20 is disposed in a housing of the vehicle-mounted image capturing device, the housing is a fixing member 310, the fixing member 310 is rotatably connected to a mounting plate 320, and the mounting plate 320 is configured to be fixed to a body of an automobile. By adopting the camera module 20, the camera performance of the electronic device 30 can be effectively improved.

Referring to fig. 17, some embodiments of the present application also provide an automobile 40. When the electronic apparatus 30 is an in-vehicle image pickup apparatus, the electronic apparatus 30 may function as a front-view image pickup apparatus, a rear-view image pickup apparatus, or a side-view image pickup apparatus of the automobile 40. Specifically, the automobile 40 includes a mounting portion 410, and the mount 310 of the electronic device 30 is mounted on the mounting portion 410, and the mounting portion 410 may be a part of a vehicle body, such as an air intake grille, a side view mirror, a rear view mirror, a trunk lid, a roof, and a center console. When the electronic apparatus 30 is provided with the rotatable mounting plate 320, the electronic apparatus 30 is mounted to the mounting portion 410 of the automobile 40 through the mounting plate 320. The electronic device 30 may be mounted on any position of the front side of the vehicle body (e.g., at the air intake grille), the left headlamp, the right headlamp, the left rearview mirror, the right rearview mirror, the trunk lid, the roof, and the like. Secondly, a display device can be arranged in the automobile 40, and the electronic device 30 is in communication connection with the display device, so that images obtained by the electronic device 30 on the installation part 410 can be displayed on the display device in real time, a driver can obtain environment information around the installation part 410 in a wider range, and the driver can drive the automobile more conveniently and safely. By using the electronic device 30, the automobile 40 can obtain a high-quality imaging picture, thereby being beneficial to improving the driving safety. Particularly, for driving modes such as automatic driving which require automatic analysis processing of the imaging picture, the improvement of the imaging quality can greatly improve the accuracy of system analysis and provide more accurate guidance for the automobile 40, so that the safety factor of the driving modes such as automatic driving is effectively improved.

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:

1.8≤TTL/EPL≤1.99；

2. The optical system according to claim 1, wherein the optical system satisfies the following relationship:

53°≤(FOV*f)/Imgh≤62°；

wherein FOV is the maximum field angle of the optical system, f is the effective focal length of the optical system, and Imgh is the image height corresponding to the maximum field angle of the optical system.

3. The optical system according to claim 1, wherein the optical system satisfies the following relationship:

-2.3≤f1/R2≤-1.9；

wherein f1 is an effective focal length of the first lens, and R2 is a curvature radius of an image side surface of the first lens on an optical axis.

4. The optical system according to claim 1, wherein the optical system satisfies the following relationship:

1≤d1/f≤1.8；

wherein d1 is the distance on the optical axis from the image-side surface of the first lens element to the object-side surface of the second lens element, and f is the effective focal length of the optical system.

5. The optical system according to claim 1, wherein the diaphragm is disposed between the third lens and the fourth lens, and the optical system satisfies the following relationship:

3≤f3/f≤6；

wherein f3 is an effective focal length of the third lens, and f is an effective focal length of the optical system.

6. The optical system according to claim 1, wherein the optical system satisfies the following relationship:

6≤|R5-R6|/d3≤35；

wherein R5 is a radius of curvature of an object-side surface of the third lens element on an optical axis, R6 is a radius of curvature of an image-side surface of the third lens element on the optical axis, and d3 is a distance from the image-side surface of the third lens element to an object-side surface of the fourth lens element on the optical axis.

7. The optical system according to claim 1, wherein the optical system satisfies the following relationship:

1.3≤(CT2+CT3)/f≤2.4；

wherein CT2 is the thickness of the second lens element, CT3 is the thickness of the third lens element, and f is the effective focal length of the optical system.

8. The optical system according to claim 1, wherein the optical system satisfies the following relationship:

1.9≤f4/CT4≤3；

wherein f4 is the effective focal length of the fourth lens element, and CT4 is the thickness of the fourth lens element on the optical axis.

9. The optical system according to claim 1, wherein the optical system satisfies the following relationship:

3≤f56/(CT5-CT6)≤49；

wherein f56 is a combined focal length of the fifth lens element and the sixth lens element, CT5 is an optical thickness of the fifth lens element, and CT6 is an optical thickness of the sixth lens element.

10. The optical system according to claim 1, wherein the optical system satisfies the following relationship:

10≤TTL/f≤12；

wherein f is an effective focal length of the optical system.

11. The optical system according to claim 1, wherein the optical system satisfies the following relationship:

Vd5-Vd6≤36；

wherein Vd5 is the Abbe number of the fifth lens, and Vd6 is the Abbe number of the sixth 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 electronic device, comprising a fixing member and the camera module of claim 12, wherein the camera module is disposed on the fixing member.

14. An automobile comprising a mounting portion and the electronic device of claim 13, wherein the electronic device is provided in the mounting portion.