CN112433345A

CN112433345A - Optical lens, camera module, electronic device and vehicle

Info

Publication number: CN112433345A
Application number: CN202011431608.1A
Authority: CN
Inventors: 蔡雄宇; 乐宇明; 赵迪
Original assignee: Tianjin OFilm Opto Electronics Co Ltd
Current assignee: Jiangxi Oufei Optics Co ltd
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2021-03-02

Abstract

The invention discloses an optical lens, a camera module, an electronic device and a vehicle. The optical lens assembly sequentially comprises a first lens with negative refractive power, a second lens with negative refractive power, a third lens with positive refractive power and a fourth lens with positive refractive power from an object side to an image side, wherein the object side surface of the fourth lens is a convex surface near an optical axis, and the fourth lens is a fifth lens with negative refractive power and a sixth lens with positive refractive power; the optical imaging system further comprises a diaphragm; the optical lens satisfies the following relation: 12.6mm <2 x f tan (FOV/2) <14.5mm, where f is the effective focal length of the optical lens and FOV is the maximum field angle of the optical lens. The product of the effective focal length of the optical lens and the tangent value of half of the maximum field angle is multiplied by 2 to be between 12.6mm and 14.5mm, so that the distortion of the whole optical lens is favorably controlled, the distortion of the optical lens is smaller, the resolution capability of the optical lens is improved, the distortion risk of a shot picture at a larger angle is reduced, and the imaging quality of the optical lens is improved.

Description

Optical lens, camera module, electronic device and vehicle

Technical Field

The present disclosure relates to optical imaging technologies, and particularly to an optical lens, a camera module, an electronic device, and a vehicle.

Background

With the rapid development of economic technology, automobiles become a necessary vehicle for families, however, due to the limitation of mechanisms, the automobiles have a plurality of vision blind areas, and because drivers cannot see the blind areas in the driving process, the risk of traffic accidents is easily increased.

The automobile that has now generally disposes on-vehicle module of making a video recording, on-vehicle module of making a video recording can shoot the environment around the automobile and transmit to display device to the user can comparatively audio-visual environmental condition who obtains around the automobile, in order to prevent the emergence of the traffic accident because the blind area leads to. In order to increase the imaging range of the imaging module, how to reduce the risk of distortion of the image taken at a large angle is a subject of study.

Disclosure of Invention

In view of the above, embodiments of the present invention provide an optical lens, a camera module, an electronic device and a vehicle.

In the optical lens system according to the embodiment of the present invention, the optical lens system includes, in order from an object side to an image side, 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 positive refractive power, a fifth lens element with negative refractive power, and a sixth lens element with positive refractive power. The object side surface of the first lens is a convex surface near the optical axis, and the image side surface of the first lens is a concave surface near the optical axis. The object side of the second lens is convex near the optical axis, the object side of the fourth lens is convex near the optical axis, the image side of the fourth lens is convex near the optical axis, the object side of the fifth lens is concave near the optical axis, the image side of the fifth lens is concave near the optical axis, and the sixth lens is convex or concave near the optical axis. The optical imaging system further comprises a diaphragm, and the optical lens satisfies the following relational expression: 12.6mm <2 x f tan (FOV/2) <14.5mm, where f is the effective focal length of the optical lens and FOV is the maximum field angle of the optical lens.

The product of the effective focal length of the optical lens and the tangent value of half of the maximum field angle is multiplied by 2 to be between 12.6mm and 14.5mm, so that the distortion of the whole optical lens is favorably controlled, the distortion of the optical lens is smaller, the resolution capability of the optical lens is improved, the distortion risk of a shot picture at a larger angle is reduced, and the imaging quality of the optical lens is improved.

In some embodiments, the optical lens may be used in both the visible and infrared bands.

Therefore, the number of application scenes of the optical lens can be increased, and the use of a user is facilitated.

In some embodiments, the object-side surface and the image-side surface of at least one lens of the optical lens are both plastic aspheric surfaces, and the abbe number of at least one lens of the optical lens satisfies the following relation:

Vd<24。

under the condition of satisfying the relational expression, the correction of the chromatic aberration by the optical lens is facilitated, and the imaging quality of the optical lens is improved.

In some embodiments, the optical lens satisfies the following relationship:

0.5<Sagf2/CT1<2.5；

wherein Sagf2 is the rise of the image side of the first lens at the maximum effective aperture, and CT1 is the thickness of the first lens on the optical axis.

Under the condition of satisfying the above relation, the phenomenon that the central thickness of the first lens is too large or the image side surface is too curved while the requirement of the refractive power is satisfied can be avoided, the processing of the first lens is facilitated, and the production cost of the optical lens is reduced. If the first lens thickness value is too large, the weight of the optical lens increases, which is disadvantageous in terms of weight reduction and size reduction of the optical lens, if the lower limit of the conditional expression 0.5< Sagf2/CT1<2.5 is exceeded; beyond the upper limit of the conditional expression 0.5< Sagf2/CT1<2.5, the image-side surface of the first lens is excessively curved, the difficulty of processing the first lens increases, and the production cost of the first lens increases. Meanwhile, the image side surface of the first lens is too curved, so that edge aberration is easily generated, and the improvement of the imaging quality of the optical lens is not facilitated.

In some embodiments, the optical lens satisfies the following relationship:

-7.7<f2/CT2<-4.2；

wherein f2 is the focal length of the second lens, and CT2 is the thickness of the second lens on the optical axis.

Under the condition of satisfying the relation, the tolerance sensitivity of the central thickness of the second lens can be reduced, the processing difficulty of the single lens is reduced, the assembly yield of the optical lens is favorably improved, and the production cost is further reduced. By satisfying the relation-7.7 < f2/CT2< -4.2, the focal length of the second lens is prevented from being too large, and the astigmatism which is difficult to correct is prevented from being generated by the optical lens, so that the imaging quality of the optical lens is reduced; meanwhile, the phenomenon that the light-weight characteristic of the optical lens is unfavorable when the central thickness of the second lens is too large or too small is avoided, the larger the central thickness of the second lens is, the larger the weight of the second lens is, and the smaller the central thickness of the second lens is, the greater the difficulty of the processing technology of the second lens is.

In some embodiments, the optical lens satisfies the following relationship:

-3.4<f5/CT5≤-1.8；

wherein f5 is a focal length of the fifth lens, and CT5 is a thickness of the fifth lens on an optical axis.

Under the condition of satisfying the relation, the focal length of the fifth lens is prevented from being too large, and the astigmatism which is difficult to correct is prevented from being generated by the lens system, so that the imaging quality of the optical lens is reduced. Meanwhile, the phenomenon that the light-weight characteristic of the optical lens is unfavorable when the central thickness of the fifth lens is too large or too small and the weight of the fifth lens is larger when the central thickness of the fifth lens is larger is avoided, and the processing difficulty of the fifth lens is larger when the central thickness of the fifth lens is smaller.

In some embodiments, the optical lens satisfies the following relationship:

1.8<f6/CT6<3；

wherein f6 is a focal length of the sixth lens, and CT6 is a thickness of the sixth lens on an optical axis.

Under the condition of satisfying the above relational expression, be favorable to reducing the exit angle that the pencil jetted out the battery of lens, and then reduced the angle that the pencil jetted into photosensitive element, improved photosensitive element's photosensitive performance to promote optical lens's the formation of image quality. If the focal length of the sixth lens element is too long and the refractive power of the sixth lens element is insufficient, the angle at which the light beam enters the photosensitive element is large, which results in the phenomenon of imaging distortion caused by insufficient information of the object identified by the photosensitive element; exceeding the lower limit of the conditional expression 1.8< f6/CT6<3, on the premise of satisfying the optical performance, the center thickness of the sixth lens is too large, and the plastic lens is sensitive to thermal deformation, thereby causing the thermal stability of the optical lens to be reduced.

In some embodiments, the optical lens satisfies the following relationship:

4mm²<(f1*f2*f3)/f<7.5mm²；

wherein f1, f2, f3 are focal lengths of the first lens, the second lens and the third lens, respectively, and f is an effective focal length of the optical lens.

Under the condition of satisfying the above relational expression, be favorable to controlling the convergence of the preceding lens group light beam of optical lens, make the wide-angle visual field light penetrate into optical lens, ensure optical lens's wide angle, positive negative lens combination can rectify the phase difference each other in the lens group simultaneously, promotes the resolving power to improve optical lens's image quality.

In some embodiments, the optical lens satisfies the following relationship:

2.1<f45/f<4.7；

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

Under the condition of satisfying the above relational expression, be favorable to reducing the angle of the optical system that jets out after the light is turned over through the battery of lens, and then reduced the incident angle that light jetted into optical lens's photosensitive element, improved photosensitive element's photosensitive performance, promoted optical lens's imaging quality. Through arranging a lens group of the fourth lens with positive refractive power and the fifth lens with negative refractive power, aberration generated by the refraction and the rotation of the light ray through the front lens is corrected, and the system resolving power is improved; exceeding the upper limit of the relation 2.1< f45/f <4.7, it is not easy to suppress the occurrence of higher order aberration due to the light beam in the peripheral portion of the imaging region; if the lower limit of the conditional expression 2.1< f45/f <4.7 is exceeded, the suppression of achromatization is not favorable, and high resolution performance is obtained.

In some embodiments, the optical lens satisfies the following relationship:

6.1<TTL/f<7.2；

wherein, TTL is a distance on an optical axis from an object-side surface of the first lens element to an image plane of the optical lens, and f is an effective focal length of the optical lens.

When the relation 6.1< TTL/f <7.2 is satisfied, the total optical length of the optical lens is controlled by limiting the relation between the total optical length and the focal length of the optical lens, so that the characteristic of miniaturization of the optical lens is satisfied. The total length of the optical lens is too long to be beneficial to miniaturization when the upper limit of the relation 6.1< TTL/f <7.2 is exceeded; if the relation is more than the lower limit of the relation 6.1< TTL/f <7.2, and the focal length of the optical lens is too long, it is not favorable to satisfy the field angle range of the optical lens, and sufficient object space information cannot be obtained.

The camera module according to an embodiment of the present invention includes the optical lens according to any one of the above embodiments and a photosensitive element disposed on an image side of the optical lens.

In the camera module, the distortion of the optical lens is small, so that the resolution capability of the optical lens is improved, the distortion risk of a shot picture at a large angle is reduced, and the imaging quality of the optical lens on the photosensitive element is improved.

The electronic device comprises a shell and the camera module, wherein the camera module is arranged on the shell.

The electronic device of the embodiment of the invention adopts the camera module, and has better shooting capability due to smaller distortion and high resolution capability of the optical lens.

The vehicle of this application embodiment includes the automobile body and the aforesaid the camera module, the camera module sets up on the automobile body. According to the embodiment of the invention, the camera module can be used for acquiring a larger visual angle range, and images with higher quality can be acquired through the camera module.

Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of an optical lens according to a first embodiment of the present invention;

FIG. 2 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of an optical lens according to an embodiment of the disclosure;

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

FIG. 4 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of an optical lens according to a second embodiment of the disclosure;

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

fig. 6 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of an optical lens disclosed in the third embodiment of the invention;

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

fig. 8 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens according to the fourth embodiment of the present invention;

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

fig. 10 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of an optical lens according to a fifth embodiment of the disclosure;

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

fig. 12 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of an optical lens according to a sixth embodiment of the present invention;

fig. 13 is a schematic structural diagram of a camera module according to an embodiment of the present invention;

FIG. 14 is a schematic structural diagram of an electronic device according to an embodiment of the invention;

fig. 15 is a schematic plan view of a vehicle according to an embodiment of the invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

Referring to fig. 1, an optical lens 10 according to the present invention 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, a fifth lens element L5 with negative refractive power, and a sixth lens element L6 with positive refractive power.

The first lens element L1 has an object-side surface S1 and an image-side surface S2, the object-side surface S1 of the first lens element L1 is convex near the optical axis Z, and the image-side surface S2 of the first lens element L1 is concave near the optical axis Z. The second lens L2 has an object-side surface S3 and an image-side surface S4, and the object-side surface S3 of the second lens L2 is convex in the vicinity of the optical axis Z. The third lens element L3 has an object-side surface S5 and an image-side surface S6, and the image-side surface S6 of the third lens element L3 is concave or convex near the optical axis Z. The fourth lens element L4 has an object-side surface S7 and an image-side surface S8, the object-side surface S7 of the fourth lens element L4 is convex near the optical axis Z, and the image-side surface S8 of the fourth lens element L4 is convex near the optical axis Z. The fifth lens L5 has an object-side surface S9 and an image-side surface S10, the object-side surface S9 of the fifth lens L5 is concave in the vicinity of the optical axis Z, and the image-side surface S10 of the fifth lens L5 is concave in the vicinity of the optical axis Z. The sixth lens element L6 has an object-side surface S11 and an image-side surface S12, and the image-side surface S12 of the sixth lens element L6 is convex or concave in the vicinity of the optical axis Z.

In the embodiment of the present invention, the optical lens 10 further includes a stop STO. The stop STO may be an aperture stop or a field stop. The embodiment of the present invention will be described by taking an example in which the stop STO is an aperture stop. The stop STO is disposed between the third lens L3 and the fourth lens L4, but of course, in other embodiments, the stop STO may be disposed at other positions, for example, in other embodiments, the stop STO may be disposed on the surface of any one lens, or between any two lenses, or between the sixth lens L6 and the protective glass L7, and the specific position of the stop STO may be set according to actual circumstances, which is not limited herein. The optical lens 10 can better control the light entering amount through reasonable stop STO position setting, thereby improving the imaging effect and the imaging quality of the optical lens 10.

Further, in the embodiment of the present invention, a larger field angle and an improved resolution can be realized through a reasonable lens configuration, so as to improve the imaging quality and facilitate the use of a user.

Further, the optical lens 10 satisfies the following relational expression:

12.6mm<2*f*tan(FOV/2)<14.5mm；……(1)

where f is the effective focal length of the optical lens 10, and the FOV is the maximum field angle of the optical lens 10.

That is, 2 × f tan (FOV/2) may be any value in the interval (12.6, 14.5) in mm. For example, the values are 12.7, 12.8, 12.9, 13, 13.1, 13.2, 13.3, 13.5, 13.8, 13.9, 14, 14.2, 14.3, 14.4, etc.

The product of the effective focal length of the optical lens 10 and the tangent value of half of the maximum field angle is multiplied by 2 to be between 12.6mm and 14.5mm, so that the distortion of the whole optical lens 10 is favorably controlled, the distortion of the optical lens 10 is smaller, the resolution capability of the optical lens 10 is improved, the distortion risk of a shot picture at a larger angle is reduced, and the imaging quality of the optical lens 10 is improved.

In some embodiments, the optical lens 10 may be used in both the visible and infrared bands.

Therefore, the number of application scenes of the optical lens 10 can be increased, and the use of the optical lens is facilitated for users.

In some embodiments, the object-side surface and the image-side surface of at least one lens of the optical lens 10 are both plastic aspheric surfaces, and the abbe number of at least one lens of the optical lens 10 satisfies the following relation:

Vd<24；……(2)

that is, Vd may be any value less than 24, for example, 23, 22, 21, 18, 15, 12, 11, 9, 8, 7, 6, 4, 3, 2, 1, etc.

Under the condition of satisfying the above relational expression, the correction of chromatic aberration by the optical lens 10 is facilitated, and the imaging quality of the optical lens 10 is improved.

In addition, since the object-side surface and the image-side surface of at least one lens of the optical lens 10 are both plastic aspheric surfaces, the overall weight of the optical lens 10 can be reduced, so that the optical lens 10 is light and convenient to use.

In some embodiments, the optical lens 10 satisfies the following relationship:

0.5<Sagf2/CT1<2.5；……(3)

wherein Sagf2 is the saggital height of the image side surface S2 of the first lens L1 at the maximum effective aperture, and the saggital height is the distance from the center of the image side surface S2 of the first lens L1 to the maximum effective aperture of the surface in the direction parallel to the optical axis Z; when the value is a positive value, the maximum effective aperture of the surface is closer to the image side of the system than the center of the surface in a direction parallel to the optical axis of the optical lens 10; when the value is negative, the plane has a larger effective clear aperture at the object side than at the center of the plane in a direction parallel to the optical axis Z of the system. CT1 is the thickness of the first lens L1 on the optical axis Z.

That is, Sagf2/CT1 may be any value in the interval (0.5, 2.5), for example, 0.51, 0.52, 0.53, 0.54, 0.56, 0.58, 0.6, 0.7, 0.8, 0.9, 1.0, 1.2, 1.5, 1.6, 1.8, 2.0, 2.2, 2.4, etc.

Under the condition of satisfying the above relation (3), the phenomenon that the center thickness of the first lens element L1 is too large or the image side surface S2 is too curved while satisfying the refractive power requirement can be avoided, which is beneficial to processing the first lens element L1 and reduces the production cost of the optical lens 10. If the thickness of the first lens element L1 is too large in excess of the lower limit of the conditional expression (3), the weight of the optical lens 10 increases, which is disadvantageous in weight reduction and size reduction of the optical lens 10; exceeding the upper limit of the conditional expression (3), the image side surface S2 of the first lens L1 is excessively curved, the difficulty of processing the first lens L1 increases, and the production cost of the first lens L1 increases. Meanwhile, the image-side surface S2 of the first lens element L1 is too curved, which is prone to generate edge aberration, and is not favorable for improving the imaging quality of the optical lens 10.

In some embodiments, the optical lens 10 satisfies the following relationship:

-7.7<f2/CT2<-4.2；……(4)

where f2 is the focal length of the second lens L2, and CT2 is the thickness of the second lens L2 on the optical axis Z.

That is, f2/CT2 can be any value in the interval (-7.7, -4.2), for example, the values are-7.6, -7.5, -7.4, -7.3, -7, -6, -5.5, -5.2, -4.8, -4.6, -4.4, -4.3, -4.25, etc.

Under the condition of satisfying the relation (4), the tolerance sensitivity of the center thickness of the second lens L2 can be reduced, the difficulty of the processing technique of the single lens is reduced, the assembly yield of the optical lens 10 is improved, and the production cost is further reduced. By satisfying the relation (4), the focal length of the second lens L2 is prevented from being too large, and astigmatism which is difficult to correct is prevented from being generated by the optical lens 10, so that the imaging quality of the optical lens 10 is reduced; meanwhile, it is avoided that the central thickness of the second lens L2 is too large or too small, the larger the central thickness of the second lens L2 is, the larger the weight of the second lens L2 is, which is not favorable for the light-weight characteristic of the optical lens 10, and the smaller the central thickness of the second lens L2 is, the larger the difficulty in the processing of the second lens L2 is.

In some embodiments, the optical lens 10 satisfies the following relationship:

-3.4<f5/CT5≤-1.8；……(5)

where f5 is the focal length of the fifth lens L5, and CT5 is the thickness of the fifth lens L5 on the optical axis Z.

That is, f5/CT5 can be any value in the interval (-3.4, -1.8), for example, the value is-3.3, -3.2, -3.1, -3, -2.8, -2.7, -2.6, -2.5, -2.4, -2.3, -2.1, -2.0, -1.9, etc.

When the above relation (5) is satisfied, the focal length of the fifth lens L5 is prevented from being too large, and astigmatism which is difficult to correct is prevented from being generated in the lens system, thereby reducing the imaging quality of the optical lens 10. Meanwhile, it is avoided that the central thickness of the fifth lens L5 is too large or too small, the larger the central thickness of the fifth lens L5 is, the larger the weight of the fifth lens L5 is, which is not favorable for the light-weight characteristic of the optical lens 10, and the smaller the central thickness of the fifth lens L5 is, the larger the difficulty in the processing of the fifth lens L5 is.

In some embodiments, the optical lens 10 satisfies the following relationship:

1.8<f6/CT6<3；……(6)

where f6 is the focal length of the sixth lens L6, and CT6 is the thickness of the sixth lens L6 on the optical axis Z.

That is, f6/CT6 may be any value in the interval (1.8, 3), for example, the value is 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, etc.

Under the condition of satisfying the above relation (6), it is beneficial to reduce the exit angle of the light beam exiting from the lens group, and further reduce the angle of the light beam entering the photosensitive element 20, and improve the photosensitive performance of the photosensitive element 20, thereby improving the imaging quality of the optical lens 10. If the upper limit of the relation (6) is exceeded, the focal length of the sixth lens element L6 is too long, and the refractive power is insufficient, the angle of the light beam incident on the light sensing element 20 is large, which results in insufficient information for the light sensing element 20 to recognize the object and causes the phenomenon of distortion of the image; if the lower limit of the conditional expression (6) is exceeded, the thickness of the center of the sixth lens element L6 is too large, and the thermal deformation of the plastic lens is sensitive, which results in the decrease of the thermal stability of the optical lens 10.

In some embodiments, the optical lens 10 satisfies the following relationship:

4mm²<(f1*f2*f3)/f<7.5mm²；……(7)

wherein f1 × f2 × f3 is the focal length of the first lens L1, the second lens L2 and the third lens L3, respectively, and f is the effective focal length of the optical lens 10.

That is, (f1 f2 f3)/f can be any value in the interval (4, 7.5) and the unit is mm². For example, the value is 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.8, 5, 5.5, 5.6, 5.9, 6.2, 6.3, 6.8, 6.9, 7, 7.1, 7.2, 7.3, 7.4, etc.

Under the condition of satisfying the above relation (7), the convergence of the front lens group light beam of the optical lens 10 is controlled, so that the light with a large angle of view field is incident into the optical lens 10, the wide angle of the optical lens 10 is ensured, and meanwhile, the positive and negative lens combination in the lens group can mutually correct the phase difference, thereby improving the resolving power and further improving the imaging quality of the optical lens 10.

In some embodiments, the optical lens 10 satisfies the following relationship:

2.1<f45/f<4.7；……(8)

where f45 is the combined focal length of the fourth lens L4 and the fifth lens L5, and f is the effective focal length of the optical lens 10.

That is, f45/f can be any value in the interval (2.1, 4.7), for example, the value is 2.2, 2.3, 2.5, 2.8, 2.9, 3.2, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, etc.

Under the condition of satisfying the above relation (8), the angle of the light exiting from the optical system after being refracted by the lens group is favorably reduced, so that the incident angle of the light entering the photosensitive element 20 of the optical lens 10 is reduced, the photosensitive performance of the photosensitive element 20 is improved, and the imaging quality of the optical lens 10 is improved. Through the lens assembly of the fourth lens element L4 with positive refractive power and the fifth lens element L5 with negative refractive power, the aberration generated by the refraction of the light beam through the front lens element is corrected, and the system resolving power is improved; exceeding the upper limit of the relation (8), it is not easy to suppress the occurrence of high-order aberration due to the beam at the peripheral portion of the imaging region; exceeding the lower limit of the relational conditional expression (8) is disadvantageous in suppressing achromatization and obtaining high resolution performance.

In some embodiments, the optical lens 10 satisfies the following relationship:

6.1<TTL/f<7.2；……(9)

wherein, TTL is a distance from the object-side surface S1 of the first lens element L1 to the image plane S15 of the optical lens 10 on the optical axis Z, and f is an effective focal length of the optical lens 10.

That is, TTL/f can be any value in the interval (6.1, 7.2), for example, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9, 7.0, 7.1, 7.15, 7.18, 7.19, etc.

When the above-described relational expression (9) is satisfied, the optical total length of the optical lens 10 is controlled by defining the relationship between the optical total length of the optical lens 10 and the focal length of the optical lens 10, and the characteristic of downsizing the optical lens 10 is satisfied. Exceeding the upper limit of the relation (9), the total length of the optical lens 10 is too long, which is not beneficial to miniaturization; if the focal length of the optical lens 10 is too long beyond the lower limit of the relation (9), it is not favorable to satisfy the field angle range of the optical lens 10, and sufficient object space information cannot be obtained.

In some embodiments, the optical lens 10 further includes a protective glass L7. When the optical lens 10 is used for imaging, light rays emitted or reflected by a subject enter the optical lens 10 from the object side direction, pass through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the protective glass L7 in this order, and finally converge on an imaging surface.

In some embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens, the L4, the fifth lens L5, and the sixth lens L6 may all be plastic lenses or glass lenses. The plastic lens has lower cost, which is beneficial to reducing the cost of the whole optical lens 10; the glass lens is not easy to expand with heat or contract with cold due to the change of the environmental temperature, so that the imaging quality of the optical lens 10 is relatively stable. In some embodiments, at least one surface of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 is aspheric. The optical lens 10 can effectively reduce the total length of the optical lens 10 by adjusting the curvature radius and the aspheric surface coefficient of each lens surface, and can effectively correct the aberration and improve the imaging quality.

In the embodiment of the invention, the object-side surface and the image-side surface of the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are aspheric and made of plastic materials, so as to achieve the design of an ultra-thin infrared lens.

The surface shape of the aspherical surface is determined by the following formula (10):

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

Specifically, the object-side surface S1 and the image-side surface S2 of the first lens L1, the object-side surface S13 and the image-side surface S14 of the cover glass L7 are spherical surfaces, and the first lens L1 and the cover glass L7 are made of glass.

The first embodiment is as follows:

referring to fig. 1, in the first embodiment, the first lens element L1 has negative refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power, the fourth lens element L4 has positive refractive power, the fifth lens element L5 has negative refractive power, and the sixth lens element L6 has positive refractive power.

The object-side surface S1 is convex near the optical axis Z, and the image-side surface S2 is concave near the optical axis Z. The object-side surface S3 is convex near the optical axis Z, and the image-side surface S4 is concave near the optical axis Z. The object-side surface S5 is convex near the optical axis Z, and the image-side surface S6 is concave near the optical axis Z. The object-side surface S7 is convex near the optical axis Z, and the image-side surface S8 is convex near the optical axis Z. The object-side surface S9 is concave near the optical axis Z, and the image-side surface S10 is concave near the optical axis Z. The object-side surface S11 is convex near the optical axis Z, and the image-side surface S12 is convex near the optical axis Z.

The optical lens 10 satisfies the conditions of the following table:

TABLE 1

In table 1, f is the effective focal length of the optical lens 10; FNO is the f-number of the optical lens 10; FOV is the maximum field angle of the optical lens 10; wherein the units of the Y radius (curvature radius), the thickness and the focal length are mm. The reference wavelength of the focal length is 632.8 nm; the reference wavelengths of the refractive index and Abbe number are 587.56 nm.

Table 2 below lists the conic coefficient K and the higher-order correction coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 of the aspherical surfaces (S3, S4, S5, S6, S7, S8, S9, S10, S11, S12) of the optical lens 10 according to the first embodiment, which are derived from the above aspherical surface type formula (10).

TABLE 2

Number of noodles	S3	S4	S5	S6	S7
						K	0.000E+00	-1.704E+00	0.000E+00	0.000E+00	0.000E+00
A4	-3.530E-01	2.133E+00	3.713E-01	-8.954E-01	-1.225E+00
						A6	-2.564E+00	-1.917E+01	-5.458E+00	3.041E+00	3.066E+00
A8	2.443E+00	9.380E+01	4.816E+01	-3.848E+00	-1.256E+01
						A10	2.909E+00	-4.090E+02	-2.559E+02	2.445E+00	7.447E+01
A12	-5.644E+00	1.129E+03	6.085E+02	-7.817E-01	-3.826E+02
						A14	3.055E+00	-1.557E+03	-5.209E+02	1.007E-01	9.408E+02
A16	-5.533E-01	8.301E+02	0.000E+00	0.000E+00	-8.061E+02
						A18	0.000E+00	0.000E+00	0.000E+00	0.000E+00	0.000E+00
A20	0.000E+00	0.000E+00	0.000E+00	0.000E+00	0.000E+00
						Number of noodles	S8	S9	S10	S11	S12
K	-3.605E-01	-2.382E-01	0.000E+00	-3.217E+00	0.000E+00
						A4	-1.510E+00	-8.367E-01	-3.108E+00	-2.176E+00	4.800E-01
A6	1.592E+01	1.916E+01	2.409E+01	1.471E+01	-2.071E+00
						A8	1.045E+01	-2.843E+01	-1.071E+02	-6.591E+01	3.424E+00
A10	-6.783E+02	-4.951E+02	3.090E+02	1.933E+02	-1.957E+00
						A12	3.000E+03	2.369E+03	-6.023E+02	-3.435E+02	0.000E+00
A14	-5.200E+03	-3.962E+03	6.986E+02	3.271E+02	0.000E+00
						A16	3.268E+03	2.314E+03	-3.469E+02	-1.279E+02	0.000E+00
A18	0.000E+00	0.000E+00	0.000E+00	0.000E+00	0.000E+00
						A20	0.000E+00	0.000E+00	0.000E+00	0.000E+00	0.000E+00

Fig. 2A to 2C are a spherical aberration graph, an astigmatism graph, and a distortion graph, respectively, in the first embodiment.

The abscissa of the spherical aberration graph represents the focus offset, the ordinate represents the normalized field of view, and the focus offsets of different fields of view are all within ± 0.05mm when the wavelengths given in fig. 2A are 865.0000nm, 850.0000nm, 835.0000nm, 632.8000nm, 610.1809nm, 587.5618nm, 546.0740nm, and 479.9914nm, respectively, which indicates that the optical lens 10 in this embodiment has small spherical aberration and good imaging quality.

The abscissa of the astigmatism graph represents the focus offset and the ordinate represents the field angle. The astigmatism curve given in fig. 2B shows that when the wavelength is 632.8000nm, the focus shifts of the sagittal image plane and the meridional image plane are both within ± 0.05mm, which indicates that the optical lens 10 in this embodiment has small astigmatism and good imaging quality.

The abscissa of the distortion curve graph represents the distortion rate, the ordinate represents the field angle, and the distortion curve shown in fig. 2C represents that the distortion is within ± 80% when the wavelength is 632.8000nm, which shows that the distortion of the optical lens 10 in the embodiment is better corrected and the imaging quality is better.

Example two:

referring to fig. 3, in the second embodiment, the first lens element L1 has negative refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power, the fourth lens element L4 has positive refractive power, the fifth lens element L5 has negative refractive power, and the sixth lens element L6 has positive refractive power.

The optical lens 10 satisfies the conditions of the following table:

TABLE 3

In table 3, f is the effective focal length of the optical lens 10; FNO is the f-number of the optical lens 10; FOV is the maximum field angle of the optical lens 10; wherein the units of the Y radius (curvature radius), the thickness and the focal length are mm. The reference wavelength of the focal length is 610.0 nm; the reference wavelengths of the refractive index and Abbe number are 587.56 nm.

Table 4 below lists the conic coefficient K and the higher-order correction coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 of each aspherical surface (S3, S4, S5, S6, S7, S8, S9, S10, S11, S12) of the optical lens 10 of example two, which are derived from the above aspherical surface type formula (10).

TABLE 4

Number of noodles	S3	S4	S5	S6	S7
						K	0.000E+00	-1.787E+00	0.000E+00	0.000E+00	0.000E+00
A4	-6.218E-01	1.803E+00	3.161E-01	-1.135E+00	-1.533E+00
						A6	-1.966E+00	-1.905E+01	-5.662E+00	3.880E+00	4.255E+00
A8	3.092E+00	1.017E+02	4.598E+01	-5.495E+00	-1.908E+01
						A10	-7.302E-01	-4.458E+02	-2.428E+02	4.096E+00	8.422E+01
A12	-1.233E+00	1.223E+03	5.916E+02	-1.586E+00	-2.847E+02
						A14	8.881E-01	-1.702E+03	-5.214E+02	2.522E-01	5.813E+02
A16	-1.726E-01	9.258E+02	0.000E+00	0.000E+00	-4.735E+02
						A18	0.000E+00	0.000E+00	0.000E+00	0.000E+00	0.000E+00
A20	0.000E+00	0.000E+00	0.000E+00	0.000E+00	0.000E+00
						Number of noodles	S8	S9	S10	S11	S12
K	-5.968E-01	-3.433E-01	0.000E+00	-3.254E+00	0.000E+00
						A4	-7.015E-01	-3.008E-01	-2.990E+00	-1.832E+00	5.143E-01
A6	-9.566E-01	7.305E+00	2.151E+01	1.165E+01	-1.805E+00
						A8	1.474E+02	5.952E+01	-9.095E+01	-4.816E+01	2.745E+00
A10	-1.257E+03	-7.350E+02	2.652E+02	1.291E+02	-1.633E+00
						A12	4.411E+03	2.499E+03	-5.538E+02	-2.095E+02	0.000E+00
A14	-7.114E+03	-3.571E+03	6.961E+02	1.823E+02	0.000E+00
						A16	4.382E+03	1.870E+03	-3.689E+02	-6.523E+01	0.000E+00
A18	0.000E+00	0.000E+00	0.000E+00	0.000E+00	0.000E+00
						A20	0.000E+00	0.000E+00	0.000E+00	0.000E+00	0.000E+00

Fig. 4A to 4C are a spherical aberration graph, an astigmatism graph, and a distortion graph, respectively, in the second embodiment.

The abscissa of the spherical aberration graph represents the focus offset, and the ordinate represents the normalized field of view, and when the wavelengths given in fig. 4A are 850.0000nm, 610.0000nm, 587.5618nm, 546.0740nm, and 479.9914nm, respectively, the focus offsets of different fields of view are all within ± 0.05mm, which indicates that the optical lens 10 in this embodiment has a small spherical aberration and good imaging quality.

The abscissa of the astigmatism graph represents the focus offset, the ordinate represents the field angle, and the astigmatism curve shown in fig. 4B represents that the focus offsets of the sagittal image plane and the meridional image plane are within ± 0.05mm when the wavelength is 610.0000nm, which indicates that the optical lens 10 in the present embodiment has small astigmatism and good imaging quality.

The abscissa of the distortion curve represents the distortion rate, the ordinate represents the field angle, and the distortion curve shown in fig. 4C represents the distortion within ± 80% at a wavelength of 610.0000nm, which shows that the distortion of the optical lens 10 in the present embodiment is better corrected and the imaging quality is better.

Example three:

referring to fig. 5, in the third embodiment, the first lens element L1 has negative refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power, the fourth lens element L4 has positive refractive power, the fifth lens element L5 has negative refractive power, and the sixth lens element L6 has positive refractive power.

The optical lens 10 satisfies the conditions of the following table:

TABLE 5

In table 5, f is the effective focal length of the optical lens 10; FNO is the f-number of the optical lens 10; FOV is the maximum field angle of the optical lens 10; wherein the units of the Y radius (curvature radius), the thickness and the focal length are mm. The reference wavelength of the focal length is 632.8 nm; the reference wavelengths of the refractive index and Abbe number are 587.56 nm.

Table 6 below lists the conic coefficient K and the higher-order correction coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 of each aspherical surface (S3, S4, S5, S6, S7, S8, S9, S10, S11, S12) of the optical lens 10 according to the third embodiment, which are derived from the above aspherical surface type formula (10).

TABLE 6

Number of noodles	S3	S4	S5	S6	S7
						K	0.000E+00	-1.729E+00	0.000E+00	0.000E+00	0.000E+00
A4	-1.481E-01	2.275E+00	1.592E-01	-1.281E+00	-1.887E+00
						A6	-3.900E+00	-2.014E+01	-1.836E+00	6.419E+00	1.432E+01
A8	6.228E+00	5.905E+01	6.882E+00	-1.978E+01	-2.527E+02
						A10	2.456E+00	-9.935E+01	-6.228E+01	8.486E+01	3.205E+03
A12	-2.173E+01	6.329E+01	2.108E+02	-3.172E+02	-2.330E+04
						A14	2.842E+01	1.619E+02	-2.134E+02	6.905E+02	8.722E+04
A16	-1.316E+01	-2.709E+02	0.000E+00	0.000E+00	-1.293E+05
						A18	0.000E+00	0.000E+00	0.000E+00	0.000E+00	0.000E+00
A20	0.000E+00	0.000E+00	0.000E+00	0.000E+00	0.000E+00
						Number of noodles	S8	S9	S10	S11	S12
K	-6.310E-01	-4.033E-01	0.000E+00	-3.508E+00	0.000E+00
						A4	-1.394E+00	-1.603E+00	-4.111E+00	-2.359E+00	7.363E-01
A6	1.676E+01	4.101E+01	3.980E+01	1.734E+01	-2.301E+00
						A8	1.851E+01	-2.807E+02	-2.477E+02	-8.905E+01	3.554E+00
A10	-1.100E+03	1.378E+03	1.127E+03	3.133E+02	-1.923E+00
						A12	6.350E+03	-7.284E+03	-3.473E+03	-6.899E+02	0.000E+00
A14	-1.678E+04	2.611E+04	6.154E+03	8.477E+02	0.000E+00
						A16	2.060E+04	-3.768E+04	-4.650E+03	-4.429E+02	0.000E+00
A18	0.000E+00	0.000E+00	0.000E+00	0.000E+00	0.000E+00
						A20	0.000E+00	0.000E+00	0.000E+00	0.000E+00	0.000E+00

Fig. 6A to 6C are a spherical aberration graph, an astigmatism graph, and a distortion graph, respectively, in the third embodiment.

The abscissa of the spherical aberration graph represents the focus offset, and the ordinate represents the normalized field of view, and when the wavelengths given in fig. 6A are 850.0000nm, 632.8000nm, 587.5618nm, 546.0740nm, and 479.9914nm, respectively, the focus offsets of different fields of view are all within ± 0.05mm, which indicates that the optical lens 10 in this embodiment has a small spherical aberration and good imaging quality.

The abscissa of the astigmatism graph represents the focus offset, the ordinate represents the field angle, and the astigmatism curve shown in fig. 6B represents that the focus offsets of the sagittal image plane and the meridional image plane are within ± 0.1mm when the wavelength is 632.8000nm, which indicates that the optical lens 10 in the present embodiment has small astigmatism and good imaging quality.

The abscissa of the distortion curve represents the distortion rate, the ordinate represents the field angle, and the distortion curve shown in fig. 6C represents the distortion within ± 80% at a wavelength of 632.8000nm, which shows that the distortion of the optical lens 10 in the present embodiment is better corrected and the imaging quality is better.

Example four:

referring to fig. 7, in the fourth embodiment, the first lens element L1 has negative refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power, the fourth lens element L4 has positive refractive power, the fifth lens element L5 has negative refractive power, and the sixth lens element L6 has positive refractive power.

The object-side surface S1 is convex near the optical axis Z, and the image-side surface S2 is concave near the optical axis Z. The object-side surface S3 is convex near the optical axis Z, and the image-side surface S4 is concave near the optical axis Z. The object-side surface S5 is convex near the optical axis, and the image-side surface S6 is concave near the optical axis Z. The object-side surface S7 is convex near the optical axis Z, and the image-side surface S8 is convex near the optical axis Z. The object-side surface S9 is concave near the optical axis Z, and the image-side surface S10 is concave near the optical axis Z. The object-side surface S11 is convex near the optical axis Z, and the image-side surface S12 is convex near the optical axis Z.

The optical lens 10 satisfies the conditions of the following table:

TABLE 7

In table 7, f is the effective focal length of the optical lens 10; FNO is the f-number of the optical lens 10; FOV is the maximum field angle of the optical lens 10; wherein the units of the Y radius (curvature radius), the thickness and the focal length are mm. The reference wavelength of the focal length is 632.8 nm; the reference wavelengths of the refractive index and Abbe number are 587.56 nm.

Table 8 below lists the conic coefficient K and the higher-order correction coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 of each aspherical surface (S3, S4, S5, S6, S7, S8, S9, S10, S11, S12) of the optical lens 10 of example four, which are derived from the above aspherical surface type formula (10).

TABLE 8

Fig. 8A to 8C are a spherical aberration graph, an astigmatism graph, and a distortion graph, respectively, in the fourth embodiment.

The abscissa of the spherical aberration graph represents the focus offset, the ordinate represents the normalized field of view, and the focus offsets of different fields of view are all within ± 0.05mm when the wavelengths given in fig. 8A are 865.0000nm, 850.0000nm, 835.0000nm, 632.8000nm, 610.1809nm, 587.5618nm, 546.0740nm, and 479.9914nm, respectively, which indicates that the optical lens 10 in this embodiment has small spherical aberration and good imaging quality.

The abscissa of the astigmatism graph represents the focus offset, the ordinate represents the field angle, and the astigmatism curve shown in fig. 8B represents that the focus offsets of the sagittal image plane and the meridional image plane are within ± 0.1mm when the wavelength is 632.8000nm, which shows that the optical lens 10 in the present embodiment has small astigmatism and good imaging quality.

The abscissa of the distortion curve graph represents the distortion rate, the ordinate represents the field angle, and the distortion curve shown in fig. 8C represents that the distortion is within ± 80% when the wavelength is 632.8000nm, which shows that the distortion of the optical lens 10 in the embodiment is better corrected and the imaging quality is better.

Example five:

referring to fig. 9, in the fifth embodiment, the first lens element L1 has negative refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power, the fourth lens element L4 has positive refractive power, the fifth lens element L5 has negative refractive power, and the sixth lens element L6 has positive refractive power.

The object-side surface S1 is convex near the optical axis, and the image-side surface S2 is concave near the optical axis Z. The object-side surface S3 is convex near the optical axis Z, and the image-side surface S4 is concave near the optical axis Z. The object-side surface S5 is convex near the optical axis Z, and the image-side surface S6 is convex near the optical axis Z. The object-side surface S7 is convex near the optical axis Z, and the image-side surface S8 is convex near the optical axis Z. The object-side surface S9 is concave near the optical axis Z, and the image-side surface S10 is concave near the optical axis Z. The object-side surface S11 is convex near the optical axis Z, and the image-side surface S12 is concave near the optical axis Z.

The optical lens 10 satisfies the conditions of the following table:

TABLE 9

In table 9, f is the effective focal length of the optical lens 10; FNO is the f-number of the optical lens 10; FOV is the maximum field angle of the optical lens 10; wherein the units of the Y radius (curvature radius), the thickness and the focal length are mm. The reference wavelength of the focal length was 632.8nm, and the reference wavelengths of the refractive index and the Abbe number were 587.56 nm.

Table 10 below lists the conic coefficients K and the higher-order correction coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 of the respective aspherical surfaces (S3, S4, S5, S6, S7, S8, S9, S10, S11, S12) of the optical lens 10 of example five, which are derived from the above aspherical surface type formula (10).

Watch 10

Fig. 10A to 10C are a spherical aberration graph, an astigmatism graph, and a distortion graph, respectively, in the fifth embodiment.

The abscissa of the spherical aberration graph represents the focus offset, the ordinate represents the normalized field of view, and when the wavelengths given in fig. 10A are 865.0000nm, 850.0000nm, 835.0000nm, 632.8000nm, 610.1809nm, 587.5618nm, 546.0740nm, and 479.9914nm, respectively, the focus offsets of different fields of view are all within ± 0.05mm, which indicates that the optical lens 10 in this embodiment has small spherical aberration and good imaging quality.

The abscissa of the astigmatism graph represents the focus offset, the ordinate represents the field angle, and the astigmatism curve shown in fig. 10B represents that the focus offsets of the sagittal image plane and the meridional image plane are within ± 0.1mm when the wavelength is 632.8000nm, which shows that the optical lens 10 in the present embodiment has small astigmatism and good imaging quality.

The abscissa of the distortion curve graph represents the distortion rate, the ordinate represents the field angle, and the distortion curve shown in fig. 10C represents that the distortion is within ± 80% when the wavelength is 632.8000nm, which shows that the distortion of the optical lens 10 in the present embodiment is better corrected and the imaging quality is better.

Example six:

referring to fig. 11, in the fifth embodiment, the first lens element L1 has negative refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power, the fourth lens element L4 has positive refractive power, the fifth lens element L5 has negative refractive power, and the sixth lens element L6 has positive refractive power.

The optical lens 10 satisfies the conditions of the following table:

TABLE 11

In table 11, f is the effective focal length of the optical lens 10; FNO is the f-number of the optical lens 10; FOV is the maximum field angle of the optical lens 10; wherein the units of the Y radius (curvature radius), the thickness and the focal length are mm. The reference wavelength of the focal length is 632.8 nm; the reference wavelengths of the refractive index and Abbe number are 587.56 nm.

Table 12 below lists the conic coefficient K and the higher-order correction coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 of the respective aspherical surfaces (S3, S4, S5, S6, S7, S8, S9, S10, S11, S12) of the optical lens 10 of example six, which are derived from the above aspherical surface type formula (10).

TABLE 12

Fig. 12A to 12C are a spherical aberration graph, an astigmatism graph, and a distortion graph, respectively, in the sixth embodiment.

The abscissa of the spherical aberration graph represents the focus offset, the ordinate represents the normalized field of view, and the focus offsets of different fields of view are all within ± 0.025mm when the wavelengths given in fig. 12A are 865.0000nm, 850.0000nm, 835.0000nm, 632.8000nm, 610.1809nm, 587.5618nm, 546.0740nm, and 479.9914nm, respectively, which indicates that the optical lens 10 in this embodiment has small spherical aberration and good imaging quality.

The abscissa of the astigmatism graph represents the focus offset, the ordinate represents the field angle, and the astigmatism curve shown in fig. 12B represents that the focus offsets of the sagittal image plane and the meridional image plane are within ± 0.1mm when the wavelength is 632.8000nm, which shows that the optical lens 10 in the present embodiment has small astigmatism and good imaging quality.

The abscissa of the distortion curve represents the distortion rate, the ordinate represents the field angle, and the distortion curve shown in fig. 12C represents the distortion within ± 80% at a wavelength of 632.8000nm, which shows that the distortion of the optical lens 10 in the present embodiment is better corrected and the imaging quality is better.

The values of the relational expressions (1) and (2) to (9) in the first to sixth examples are shown in table 13 below.

Watch 13

Referring to fig. 13, a camera module 100 according to an embodiment of the invention includes an optical lens 10 and a photosensitive element 20. The light receiving element 20 is disposed on the image side of the optical lens 10.

The photosensitive element 20 may be a Complementary Metal Oxide Semiconductor (CMOS) photosensitive element 20 or a Charge-coupled Device (CCD) photosensitive element 20.

In the camera module 100 according to the embodiment of the present invention, the value obtained by multiplying the product of the effective focal length of the optical lens 10 and the tangent value of half of the maximum field angle by 2 is controlled to be between 12.6mm and 14.5mm, which is beneficial to controlling the distortion of the entire optical lens 10, so that the distortion of the optical lens 10 is small, thereby improving the resolution of the optical lens 10, reducing the distortion risk of taking pictures at a large angle, and improving the imaging quality of the optical lens 10.

Referring to fig. 14, an electronic device 1000 according to an embodiment of the invention includes a housing 200 and a camera module 100. The camera module 100 is mounted on the housing 200. The electronic device 1000 according to the embodiment of the present invention includes, but is not limited to, information terminal devices such as a smart phone, a mobile phone, a Personal Digital Assistant (PDA), a game machine, a Personal Computer (PC), a camera, a smart watch, a tablet PC, and a monitor, and home appliances having a photographing function.

In the electronic device 1000 according to the embodiment of the present invention, the value obtained by multiplying the product of the effective focal length of the optical lens 10 and the tangent value of half of the maximum field angle by 2 is controlled to be between 12.6mm and 14.5mm, which is beneficial to controlling the distortion of the entire optical lens 10, so that the distortion of the optical lens 10 is small, thereby improving the resolution capability of the optical lens 10, reducing the distortion risk of the shot image at a large angle, and improving the imaging quality of the optical lens 10.

Referring to fig. 15, the embodiment of the present invention further provides a vehicle 500, where the vehicle 500 of the embodiment of the present invention includes a vehicle body 510 and the camera module 100, and the camera module 100 is disposed on the vehicle body 510. According to the embodiment of the invention, the camera module 100 can obtain a wider viewing angle range, and the camera module 100 can obtain a high-quality image.

The vehicle 500 includes a fuel automobile and an electric automobile. Embodiments of the present invention do not limit the specific type of vehicle 500. The camera module 100 may be installed at a vehicle head and/or a parking space, so as to collect an image of an environment around the vehicle.

In the description of the specification, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiments or examples is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention, which is defined by the claims and their equivalents.

Claims

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

a first lens element with negative refractive power having a convex object-side surface near an optical axis and a concave image-side surface near the optical axis;

a second lens element with negative refractive power having a convex object-side surface near an optical axis;

a third lens element with positive refractive power;

a fourth lens element with positive refractive power having a convex object-side surface near an optical axis and a convex image-side surface near the optical axis;

a fifth lens element with negative refractive power having a concave object-side surface near an optical axis and a concave image-side surface near the optical axis;

a sixth lens element with positive refractive power;

the optical imaging system further comprises a diaphragm;

the optical lens satisfies the following relation:

12.6mm<2*f*tan(FOV/2)<14.5mm；

wherein f is an effective focal length of the optical lens, and the FOV is a maximum field angle of the optical lens.

2. An optical lens according to claim 1, wherein the object-side surface and the image-side surface of at least one lens of the optical lens are both plastic aspheric surfaces, and the abbe number of at least one lens of the optical lens satisfies the following relation:

Vd<24。

3. an optical lens according to claim 1, wherein the optical lens satisfies the following relation:

0.5<Sagf2/CT1<2.5；

4. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

-7.7<f2/CT2<-4.2；

5. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

-3.4<f5/CT5≤-1.8；

6. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

1.8<f6/CT6<3；

7. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

4mm²<(f1*f2*f3)/f<7.5mm²；

8. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

2.1<f45/f<4.7；

9. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

6.1<TTL/f<7.2；

10. The utility model provides a camera module which characterized in that, camera module includes:

an optical lens as claimed in any one of claims 1 to 9; and

a light sensing element disposed on an image side of the optical lens.

11. An electronic device, comprising:

a housing; and

the camera module of claim 10, said camera module mounted on said housing.

12. A vehicle, characterized by comprising:

a vehicle body; and

the camera module of claim 10, disposed on the vehicle body.