CN112462500A

CN112462500A - Optical lens, camera module and electronic device

Info

Publication number: CN112462500A
Application number: CN202011493282.5A
Authority: CN
Inventors: 乐宇明; 蔡雄宇; 董勇兵; 赵迪
Original assignee: Tianjin OFilm Opto Electronics Co Ltd
Current assignee: Tianjin OFilm Opto Electronics Co Ltd
Priority date: 2020-12-17
Filing date: 2020-12-17
Publication date: 2021-03-09

Abstract

The invention discloses an optical lens, a camera module and an electronic device. The optical lens sequentially comprises a first lens element with negative refractive power, a second lens element with negative refractive power, a third lens element with positive refractive power, a fourth lens element with negative refractive power, a fifth lens element with positive refractive power and a sixth lens element with positive refractive power from an object side to an image side, wherein the optical lens satisfies the following relation: -17mm < f1< -8mm, wherein f1 is the effective focal length of the first lens. In the optical lens of the embodiment of the present application, the first lens close to the object side is a negative lens, which provides negative refractive power for the optical lens, and can grasp light rays incident into the optical lens at a large angle, thereby expanding the field angle range of the optical lens. If the bending force exceeds the lower limit of the relational expression, the bending force of the first lens is insufficient, so that large-angle light rays are not favorably enabled to enter the optical lens, and the wide angle and the miniaturization of the optical lens are not favorably realized; if the refractive power of the first lens element exceeds the upper limit of the relationship, the refractive power of the first lens element is too high to correct the aberration of the first lens element.

Description

Optical lens, camera module and electronic device

Technical Field

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

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 image pickup module, it is a subject of research on how to expand the field angle range of the image pickup module while ensuring the imaging quality of the image pickup module.

Disclosure of Invention

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

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 negative refractive power, a fifth lens element with positive 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, the image side surface of the first lens is a concave surface near the optical axis, the image side surface of the second lens is a concave surface near the optical axis, the object side surface of the third lens is a convex surface near the optical axis, the object side surface of the fourth lens is a concave surface near the optical axis, the image side surface of the fourth lens is a concave surface near the optical axis, an object-side surface of the fifth lens element is convex near an optical axis, an image-side surface of the fifth lens element is convex near the optical axis, and the optical lens assembly satisfies the following relationship: -17mm < f1< -8mm, wherein f1 is the effective focal length of the first lens.

In the optical lens of the embodiment of the present application, the first lens close to the object side is a negative lens, which provides negative refractive power for the optical lens, and can grasp light rays incident into the optical lens at a large angle, thereby expanding the field angle range of the optical lens. If the bending force exceeds the lower limit of the relational expression, the bending force of the first lens is insufficient, so that large-angle light rays are not favorably enabled to enter the optical lens, and the wide angle and the miniaturization of the optical lens are not favorably realized; if the refractive power of the first lens element exceeds the upper limit of the relationship, the refractive power of the first lens element is too high to correct the aberration of the first lens element.

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

20mm<f1*f2/f<50mm；

wherein f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, and f is the effective focal length of the optical lens.

Therefore, the first lens and the second lens are set as negative lenses to provide negative bending force for the optical lens, which is beneficial to widening the width of light rays and further widening the light rays which are absorbed after the light rays with large angles are refracted by the first lens; and a third lens with positive bending force is arranged to contract the light beam folding angle, so that the light beam bundle fills the pupil. By satisfying the conditional relational expression, the aberration generated by the refraction of the light rays through the first lens and the second lens is favorably corrected, and the imaging resolving power is improved. Exceeding the range of the relation is not favorable for correcting the aberration of the optical lens, thereby reducing the imaging quality and being not favorable for realizing the high-pixel characteristic of the optical lens.

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

0.6<d23/d34<5.2；

wherein d23 is an air space on the optical axis from the image-side surface of the second lens element to the object-side surface of the third lens element, and d34 is an air space on the optical axis from the image-side surface of the third lens element to the object-side surface of the fourth lens element.

Under the condition that satisfies above-mentioned relational expression, the air interval distance's between reasonable second lens and the third lens that sets up optical lens and third lens and the fourth lens proportional relation is favorable to realizing optical lens's miniaturized production to, the air interval scope between second lens and third lens, third lens and the fourth lens is reasonable, can reduce the production of miscellaneous light, is favorable to promoting optical lens's image quality.

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

3.6<CT3/Sags3<8.7；

wherein CT3 is the thickness of the third lens on the optical axis, and Sags3 is the sagittal height of the object-side surface of the third lens at the maximum effective aperture.

Under the condition of satisfying the relation, the ratio relation between the central thickness of the third lens and the distance from the maximum object-side clear aperture of the third lens to the central point of the lens, which is parallel to the optical axis, is controlled, so that the problem that the processing difficulty of the lens is increased due to the overlarge central thickness or the excessively bent object-side surface of the third lens when the third lens satisfies higher refractive power is avoided, and the production cost is reduced. When the lower limit of the relational expression is exceeded, the image side surface of the third lens is too bent, the processing difficulty of the lens is increased, and the production cost of the lens is increased; meanwhile, the surface is too curved, so that edge aberration is easily generated, and the image quality of the optical lens is not improved. If the thickness of the third lens element is too large, the weight of the optical lens is increased, which is disadvantageous in weight reduction and size reduction of the optical lens.

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

6.6<f45/f<82.1；

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 that the relation is satisfied, the angle of the light rays exiting the optical lens after being refracted by the lens group is favorably reduced, the incident angle of the light rays entering the image side photosensitive element of the optical lens is further reduced, the photosensitive performance of the photosensitive element is improved, and the high-quality imaging picture of the optical lens 10 is improved. If the upper limit of the relational expression is exceeded, it is not easy to suppress the occurrence of high-order aberration due to the light flux in the peripheral portion of the imaging region; if the lower limit of the relational conditional expression is exceeded, the achromatic color is not suppressed and high resolution performance is obtained. In some embodiments, the optical lens satisfies the following relationship:

2mm<ImgH/Tan(FOV/2)<3mm；

wherein ImgH is half of the image height corresponding to the maximum field angle of the optical lens; the FOV is the maximum field angle of the optical lens.

Under the condition of meeting the relational expression, the optical lens can provide a sufficient field angle for electronic products such as mobile phones, cameras, vehicles, monitors, medical treatment and the like, so that the requirement of the high field angle is met, the angle of light rays entering a chip is reduced, and the light sensitivity of the optical lens is improved. Exceeding the upper limit of the relational expression results in insufficient field angle of the optical lens and failure to obtain sufficient object space information, and exceeding the lower limit of the relational expression results in insufficient brightness of the optical lens and failure to satisfy high-definition shooting.

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

0.7<|f123/f456|<6.8；

wherein f123 is a combined focal length of the first lens, the second lens, and the third lens, and f456 is a combined focal length of the fourth lens, the fifth lens, and the sixth lens.

Under the condition of meeting the relational expression, the distribution proportion of the combined focal length of the first lens, the second lens and the third lens and the combined focal length of the fourth lens, the fifth lens and the sixth lens of the optical lens is reasonably controlled, so that the incident width of light rays is favorably controlled, the high-level aberration of the optical lens is reduced, meanwhile, the emergent angle of the chief rays passing through the fourth lens, the fifth lens and the sixth lens can be reduced, and the relative brightness of the optical lens is improved.

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

f/EPD≥2；

wherein f is an effective focal length of the optical lens, and EPD is an entrance pupil diameter of the optical lens.

Under the condition of satisfying the relational expression, the optical lens has the effect of a large aperture and a far field depth range, and can realize clear resolution of close scenery while realizing clear imaging at infinity.

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

5<TTL/f<7；

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.

In this way, when the above relational expression is satisfied, the optical total length of the optical lens is controlled while the field angle range of the optical lens is satisfied, and the characteristic of downsizing the optical lens is satisfied. Exceeding the upper limit of the relational expression, the total length of the optical lens is too long, which is not beneficial to miniaturization; if the optical lens has an excessively long focal length exceeding the lower limit of the conditional expression, 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 according to the embodiment of the present application, the first lens close to the object side is a negative lens, which provides negative refractive power for the optical lens, and can grasp light rays incident into the optical lens at a large angle, thereby expanding the field angle range of the optical lens. If the bending force exceeds the lower limit of the relational expression, the bending force of the first lens is insufficient, so that large-angle light rays are not favorably enabled to enter the optical lens, and the wide angle and the miniaturization of the optical lens are not favorably realized; if the refractive power of the first lens element exceeds the upper limit of the relationship, the refractive power of the first lens element is too high to correct the aberration of the first lens element.

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

In the electronic device according to the embodiment of the present application, the first lens close to the object side is a negative lens, which provides negative refractive power for the optical lens, so as to capture light rays incident into the optical lens at a large angle, and expand the field angle range of the optical lens. If the bending force exceeds the lower limit of the relational expression, the bending force of the first lens is insufficient, so that large-angle light rays are not favorably enabled to enter the optical lens, and the wide angle and the miniaturization of the optical lens are not favorably realized; if the refractive power of the first lens element exceeds the upper limit of the relationship, the refractive power of the first lens element is too high to correct the aberration of the first lens element.

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.

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, the real-time optical lens 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 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 element L2 has an object-side surface S3 and an image-side surface S4, wherein the object-side surface S3 of the second lens element L2 is concave or convex near the optical axis Z, and the image-side surface S4 of the second lens element L2 is concave near the optical axis Z. The third lens element L3 has an object-side surface S5 and an image-side surface S6, and the object-side surface S5 of the third lens element L3 is convex in the vicinity of the optical axis Z. The fourth lens L4 has an object-side surface S7 and an image-side surface S8, the object-side surface S7 of the fourth lens L4 is concave in the vicinity of the optical axis Z, and the image-side surface S71 of the fourth lens L4 is concave in the vicinity of the optical axis Z. The fifth lens element L5 has an object-side surface S8 and an image-side surface S9, the object-side surface S8 of the fifth lens element L5 is convex in the vicinity of the optical axis Z, and the image-side surface S9 of the fifth lens element L5 is convex in the vicinity of the optical axis Z. The sixth lens element L6 has an object-side surface S10 and an image-side surface S11, and the image-side surface S11 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 fourth lens L4 and the fifth lens L5 are double cemented lenses, that is, the image-side surface S71 of the fourth lens L4 and the object-side surface S8 of the fifth lens L5 are cemented surfaces, and the chromatic aberration of the optical lens 10 and the spherical aberration of the optical lens 10 can be effectively reduced by the arrangement of the double cemented lenses, so as to improve the resolution of an image captured by the optical lens 10, thereby improving the definition of a picture, and facilitating the use of a user.

As shown in fig. 1, in the embodiment of the present invention, the optical lens 10 further includes a stop STO. Wherein the diaphragm can be an aperture diaphragm or a field diaphragm. 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 ir filter 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:

-17mm<f1<-8mm；……(1)

where f1 is the effective focal length of the first lens L1.

That is, f1 can be any value in the (-17, -8) interval, in mm. For example, the value is-16, -15, -14, -13, -12, -11, -10, -9, -8.8, -8.7, -8.5, -8.4, -8.3, -8.2, -8.1, etc.

In the optical lens of the embodiment of the present application, the first lens L1 near the object side is a negative lens, which provides negative refractive power for the optical lens 10, so as to capture light rays incident into the optical lens 10 at a large angle and expand the field angle range of the optical lens 10. If the lower limit of the relation (1) is exceeded, the bending force of the first lens L1 is insufficient, which is not favorable for large-angle light to enter the optical lens 10, and is not favorable for the wide-angle and miniaturization of the optical lens 10; if the refractive power of the first lens element L1 is too strong, the aberration of the first lens element L1 can not be corrected.

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

20mm<f1*f2/f<50mm；……(2)

where f1 is the effective focal length of the first lens L1, f2 is the effective focal length of the second lens L2, and f is the effective focal length of the optical lens 10.

That is, f1 × f2/f may be any value in the interval (20, 50) in mm. For example, the values are 21, 22, 23, 24, 25, 26, 27, 28, 29, 32, 35, 38, 42, 43, 45, 46, 47, 49, and the like.

Therefore, the first lens L1 and the second lens L2 are negative lenses, so as to provide negative bending force for the optical lens 10, which is beneficial to widening the width of light beams, and further widening the light beams which are absorbed after the light beams with large angles are refracted by the first lens L1; the light folding angle is then narrowed by placing a third lens L3 with positive bending force so that the beam fills the pupil. When the above relation (2) is satisfied, it is beneficial to correct the aberration generated when the light is refracted by the first lens element L1 and the second lens element L2, and improve the imaging resolution of the optical lens 10. Exceeding the range of the relational expression is not favorable for correcting the aberration of the optical lens 10, thereby degrading the imaging quality and realizing the high-pixel characteristics of the optical lens 10.

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

0.6<d23/d34<5.2……(3)；

d23 is an air space on the optical axis Z between the image-side surface S4 of the second lens L2 and the image-side surface S6 of the third lens L3, and d34 is an air space on the optical axis Z between the image-side surface S6 of the third lens L3583 and the image-side surface S71 of the fourth lens L71.

That is, d23/d34 may be any value in the interval (0.6, 5.2), for example, 0.7, 0.8, 0.9, 1.0, 1.2, 1.5, 1.9, 2.5, 2.8, 2.9, 3.4, 3.6, 3.8, 4.5, 4.7, 4.8, 4.9, 5.0, 5.1, etc.

In the case of satisfying the above relation (3), the rational arrangement of the proportional relationship of the air separation distance between the second lens L2 and the third lens L3 of the optical lens 10 and the third lens L3 and the fourth lens L4 is beneficial to realizing the miniaturized production of the optical lens 10, and the air separation range between the second lens L2 and the third lens L3, and between the third lens L3 and the fourth lens L4 is reasonable, so that the generation of stray light can be reduced, and the improvement of the imaging quality of the optical lens 10 is facilitated.

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

3.6<CT3/Sags3<8.7……(4)；

where CT3 is the thickness of the third lens L3 on the optical axis Z, and Sags3 is the sagittal height of the object side S5 of the third lens L3 at the maximum effective aperture. The rise is the distance in the direction parallel to the optical axis Z from the center of the object-side surface S5 of the third lens L3 to the maximum effective aperture of the surface; when the value is a positive value, the maximum effective aperture of the face is closer to the object side of the optical lens 10 than the center of the face in a direction parallel to the optical axis Z of the optical lens 10; when the value is a negative value, the maximum effective clear aperture of the surface is closer to the image side of the optical lens 10 than the center of the surface in a direction parallel to the optical axis Z of the optical lens 10.

That is, CT3/Sags3 may be any value in the interval (3.6, 8.7), for example, 3.8, 4.2, 4.5, 4.6, 4.7, 4.9, 5.2, 5.8, 6.2, 6.3, 6.7, 7.3, 7.4, 7.5, 7.9, 8.2, 8.6, etc.

Under the condition of satisfying the above relation (4), the third lens element L3 is prevented from having an excessively large central thickness or an excessively curved object-side surface while satisfying a high refractive power, which increases the difficulty in lens processing, thereby reducing the production cost.

If the lower limit of the relation (4) is exceeded, the image-side surface S6 of the third lens element L3 is too curved, which increases the difficulty of lens processing and increases the production cost of the lens; meanwhile, the surface is too curved, which is likely to generate edge aberration, and is not favorable for improving the image quality of the optical lens 10. If the thickness of the third lens element L3 is too large in excess of the upper limit of the conditional expression (4), the weight of the optical lens 10 increases, which is disadvantageous in weight reduction and size reduction of the imaging lens 10.

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

6.6<f45/f<82.1……(5)；

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 may be any value in the interval (6.6, 82.1), for example, the value is 7, 8, 9, 12, 15, 19, 25, 36, 45, 52, 61, 62, 75, 76, 77, 78, 79, 80, 81, 82, etc.

Under the condition that the relation (5) is satisfied, the angle of the light rays exiting the optical lens 10 after being refracted by the lens group is favorably reduced, so that the incident angle of the light rays exiting the image side photosensitive element of the optical lens 10 is reduced, the photosensitive performance of the photosensitive element is improved, and the high-quality imaging picture of the optical lens 10 is improved. Exceeding the upper limit of the above relational expression (5), 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 (5) is disadvantageous in suppressing achromatization and obtaining high resolution performance. .

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

2mm<ImgH/Tan(FOV/2)<3mm；……(6)

wherein ImgH is half of the image height corresponding to the maximum field angle of the optical lens, namely half the image height; the FOV is the maximum field angle of the optical lens 10.

That is, ImgH/Tan (FOV/2) may be any value of the interval (2, 3) in mm. For example, the values are 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 2.91, 2.95, 2.97, 2.99, etc.

Under the condition of satisfying the above relation (6), a sufficient field angle can be provided for the optical lens 10 to satisfy the requirement of high field angle for electronic products such as mobile phones, cameras, vehicles, monitors, medical treatment, etc., and simultaneously, the angle of light entering the chip is reduced, and the light sensing performance of the optical lens 10 is improved. Exceeding the upper limit of the above-mentioned relational expression (6) causes insufficient angle of view of the optical lens 10 and insufficient object space information, and exceeding the lower limit of the relational expression (6) causes insufficient brightness of the optical lens 10 and fails to satisfy high definition photographing.

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

0.7<|f123/f456|<6.8；……(7)

where f123 is a combined focal length of the first lens L1, the second lens L2, and the third lens L3, and f456 is a combined focal length of the fourth lens L4, the fifth lens L5, and the sixth lens L6.

That is, | f123/f456| may be any value in the interval (0.7, 6.8), for example, the value is 0.9, 1, 1.2, 1.5, 1.6, 1.8, 1.9, 2.2, 2.5, 2.9, 3.2, 3.5, 3.6, 4.1, 4.3, 4.5, 5.5, 5.9, 6.1, 6.2, 6.3, 6.5, 6.7, etc.

When the above relation (7) is satisfied, by reasonably controlling the distribution ratio of the combined focal length of the first lens L1, the second lens L2, and the third lens L3 of the optical lens 10 to the combined focal length of the fourth lens L4, the fifth lens L5, and the sixth lens L6, the incident width of the light is favorably controlled, the high-order aberration of the optical lens 10 is reduced, and at the same time, the exit angle of the chief ray passing through the fourth lens L4, the fifth lens L5, and the sixth lens L6 is reduced, so that the relative brightness of the optical lens 10 is improved.

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

f/EPD≥2；……(8)

where f is the effective focal length of the optical lens 10, and EPD is the entrance pupil diameter of the optical lens 10.

That is, the f/EPD can be any value greater than 2, for example, 3, 4, 5, 6, 7, 10, 12, 13, 15, 20, 22, 25, 29, 35, 38, 47, 52, 56, 59, 62, 68, 70, etc.

Under the condition of satisfying the above relation (8), the optical lens 10 has the effect of a large aperture and a relatively long depth of field, and can realize clear resolution of close scenes while realizing clear imaging at infinity.

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

5<TTL/f<7；……(9)

wherein, TTL is a distance from the object-side surface S2 of the first lens element L1 to the image plane S16 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 (5, 7), for example, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9, 6.0, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9, etc.

When the above relational expression (9) is satisfied, the total optical length of the optical lens 10 is controlled while the field angle range of the optical lens 10 is satisfied, and the characteristic that the optical lens 10 is miniaturized 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 when the lower limit of the conditional expression is exceeded, 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 an infrared filter L7 and a protective glass L8. 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, the infrared filter L7, and the protective glass L8 in this order, and finally converge on the imaging surface S16.

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 the embodiment of the present invention, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the infrared filter L7, and the protective glass L8 are made of glass.

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.

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 image-side surface S3 and the object-side surface S4 of the second lens L2, the object-side surface S7 of the fourth lens L4, the object-side surface S8 of the fifth lens L5, the object-side surface S10 and the image-side surface S11 of the sixth lens L6, the object-side surface S12 and the image-side surface S13 of the infrared filter L7, and the object-side surface S14 and the image-side surface S15 of the protective glass L7 are all spherical surfaces.

The first embodiment is as follows:

referring to fig. 1 and 2, 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 negative refractive power, the fifth lens element L5 has positive refractive power, and the sixth lens element L6 has positive refractive power.

The object-side surface S1 of the first lens element L1 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 of the second lens element L2 is concave near the optical axis Z, and the image-side surface S4 is concave near the optical axis Z. The object-side surface S5 of the third lens element L3 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 of the fourth lens element L4 is concave near the optical axis Z, and the image-side surface S71 is concave near the optical axis Z. The object-side surface S8 of the fifth lens element L5 is convex near the optical axis Z, and the image-side surface S9 is convex near the optical axis Z. The object-side surface S10 of the sixth lens element L6 is convex near the optical axis Z, and the image-side surface S11 is concave near the optical axis Z.

In the first embodiment, the object-side surface S5 and the image-side surface S6 of the third lens element L3 are aspheric, and the image-side surface S9 of the fifth lens element L5 is aspheric and made of glass, so as to improve the imaging quality of the optical lens system 10.

Table 1 is a table of characteristics of the optical lens 10 of the present embodiment, in which data of focal length is obtained using visible light with a reference wavelength of 656.27nm, data of refractive index of material and abbe number are obtained using visible light with a reference wavelength of 587.56nm, and units of Y radius, thickness, and focal length are all millimeters (mm).

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; the FOV is the maximum field angle of the optical lens 10.

Table 2 below shows the conic coefficient K and the higher-order correction coefficients a4, A6, A8, a10, a12, a14, a16, a18, and a20 of the aspherical surfaces (S5, S6, S9) of the optical lens 10 according to the first embodiment, which are obtained from the above equation (10) for the surface shape of the aspherical surface.

Table 2:

number of noodles	S5	S6	S9
				K	0.000E+00	0.000E+00	1.464E+00
A4	－6.700E－04	－1.798E－04	9.131E－04
				A6	－6.684E－06	－1.767E－05	－2.875E－04
A8	－5.116E－06	－4.100E－06	2.271E－04
				A10	5.519E－07	4.769E－07	－8.791E－05
A12	－5.227E－08	－3.507E－08	1.866E－05
				A14	2.586E－09	1.150E－09	－2.048E－06
A16	－7.028E－11	－1.300E－11	9.084E－08
				A18	0.000E+00	0.000E+00	0.000E+00
A20	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, and the ordinate represents the normalized field of view, and when the wavelengths given in fig. 2A are 950.0000nm, 706.5188nm, 656.2725nm, 587.5600nm, 546.0740nm, and 486.1327nm, 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 given in fig. 2B represents that the focus offsets of the sagittal image plane and the meridional image plane are both within ± 0.05mm at a wavelength of 656.2725nm, which illustrates that the optical lens 10 in this embodiment has less astigmatism and better 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 ± 50% when the wavelength is 656.2725nm, 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 and 4, 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 negative refractive power, the fifth lens element L5 has positive refractive power, and the sixth lens element L6 has positive refractive power.

In the second embodiment, the object-side surface S5 and the image-side surface S6 of the third lens element L3 are aspheric, and the image-side surface S9 of the fifth lens element L5 is aspheric and made of glass, so as to improve the imaging quality of the optical lens system 10.

Table 3 is a table of characteristics of the optical lens 10 of the present embodiment, in which data of focal length is obtained using visible light with a reference wavelength of 656.27nm, data of refractive index of material and abbe number are obtained using visible light with a reference wavelength of 587.56nm, and units of Y radius, thickness, and focal length are all millimeters (mm).

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; the FOV is the maximum field angle of the optical lens 10.

Table 4 below shows 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 (S5, S6, S9) of the optical lens 10 of example two, which are derived from the above-described surface form formula (10) of the aspherical surfaces.

Table 4:

number of noodles	S5	S6	S9
				K	0.000E+00	0.000E+00	7.996E－01
A4	－4.347E－04	2.141E－04	8.984E－04
				A6	6.940E－06	－2.385E－05	－3.672E－04
A8	－4.991E－06	2.365E－07	2.454E－04
				A10	6.750E－07	3.513E－08	－8.313E－05
A12	－5.516E－08	－6.004E－09	1.544E－05
				A14	2.289E－09	1.783E－10	－1.477E－06
A16	－4.155E－11	－1.506E－12	5.692E－08
				A18	0.000E+00	0.000E+00	0.000E+00
A20	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 950.0000nm, 706.5188nm, 656.2725nm, 587.5600nm, 546.0740nm, and 486.1327nm, 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. 4B represents that the focus offsets of the sagittal image plane and the meridional image plane are within ± 0.05mm when the wavelength is 656.2725nm, 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 ± 50% at a wavelength of 656.2725nm, 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 and 6, 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 negative refractive power, the fifth lens element L5 has positive refractive power, and the sixth lens element L6 has positive refractive power.

The object-side surface S1 of the first lens element L1 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 of the second lens element L2 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 of the third lens element L3 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 of the fourth lens element L4 is concave near the optical axis Z, and the image-side surface S71 is concave near the optical axis Z. The object-side surface S8 of the fifth lens element L5 is convex near the optical axis Z, and the image-side surface S9 is convex near the optical axis Z. The object-side surface S10 of the sixth lens element L6 is convex near the optical axis Z, and the image-side surface S11 is concave near the optical axis Z.

In the third embodiment, the object-side surface S10 and the image-side surface S11 of the sixth lens element L6 are aspheric and made of glass, so as to improve the imaging quality of the optical lens system 10.

Table 5 is a table of characteristics of the optical lens 10 of the present embodiment, in which data of focal length is obtained using visible light with a reference wavelength of 750nm, and data of refractive index of material and abbe number are obtained using visible light with a reference wavelength of 587.56nm, and units of Y radius, thickness, and focal length are all millimeters (mm).

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 determined by the holographic height; wherein the units of the Y radius (curvature radius), the thickness and the focal length are mm.

Table 6 below shows 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 (S10, S11) of the optical lens 10 of example three, which are derived from the above-described surface-form formula (10) of the aspherical surfaces.

Table 6:

number of noodles	S10	S11
			K	－2.244E－01	9.900E+01
A4	－2.776E－04	2.023E－03
			A6	－4.724E－05	－7.524E－05
A8	4.252E－06	4.787E－06
			A10	－3.447E－07	－3.045E－07
A12	7.351E－09	3.106E－09
			A14	0.000E+00	0.000E+00
A16	0.000E+00	0.000E+00
			A18	0.000E+00	0.000E+00
A20	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 950.0000nm, 750.0000nm, 656.2725nm, 587.5600nm, 546.0740nm, and 486.1327nm, respectively, the focus offsets of different fields of view are all within ± 0.1mm, 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. 6B represents that the focus offsets of the sagittal image plane and the meridional image plane are within ± 0.1mm when the wavelength is 750.0000nm, 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. 6C represents the distortion within ± 50% at a wavelength of 750.0000nm, which shows that the distortion of the optical lens 10 in the present embodiment is better corrected and the imaging quality is better.

Example four:

referring to fig. 7 and 8, 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 negative refractive power, the fifth lens element L5 has positive refractive power, and the sixth lens element L6 has positive refractive power.

The object-side surface S1 of the first lens element L1 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 of the second lens element L2 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 of the third lens element L3 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 of the fourth lens element L4 is concave near the optical axis Z, and the image-side surface S71 is concave near the optical axis Z. The object-side surface S8 of the fifth lens element L5 is convex near the optical axis Z, and the image-side surface S9 is convex near the optical axis Z. The object-side surface S10 of the sixth lens element L6 is convex near the optical axis Z, and the image-side surface S11 is convex near the optical axis Z.

In the fourth embodiment, the object-side surface S10 and the image-side surface S11 of the sixth lens element L6 are aspheric and made of glass, so as to improve the imaging quality of the optical lens system 10.

Table 7 is a table of characteristics of the optical lens 10 of the present embodiment, in which data of focal length is obtained using visible light with a reference wavelength of 750nm, and data of refractive index of material and abbe number are obtained using visible light with a reference wavelength of 587.56nm, and units of Y radius, thickness, and focal length are all millimeters (mm).

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; the FOV is the maximum field angle of the optical lens 10.

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 the respective aspherical surfaces (S10, S11) of the optical lens 10 of example four, which are derived from the above-described surface-form formula (10) of the aspherical surfaces.

Table 8:

number of noodles	S10	S11
			K	－2.652E－01	－9.853E+01
A4	－2.813E－04	1.618E－03
			A6	－7.359E－05	－1.430E－04
A8	9.688E－06	1.041E－05
			A10	2.238E－08	4.394E－07
A12	－4.621E－08	－6.195E－08
			A14	0.000E+00	0.000E+00
A16	0.000E+00	0.000E+00
			A18	0.000E+00	0.000E+00
A20	0.000E+00	0.000E+00

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, and the ordinate represents the normalized field of view, and when the wavelengths given in fig. 8A are 950.0000nm, 750.0000nm, 656.2725nm, 587.5600nm, 546.0740nm, and 486.1327nm, 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. 8B represents that the focus offsets of the sagittal image plane and the meridional image plane are within ± 0.1mm when the wavelength is 750.0000nm, 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 ± 50% when the wavelength is 750.0000nm, 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 and 10, 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 negative refractive power, the fifth lens element L5 has positive refractive power, and the sixth lens element L6 has positive refractive power.

In the fifth embodiment, the object-side surface S10 and the image-side surface S11 of the sixth lens element L6 are aspheric and made of glass, so as to improve the imaging quality of the optical lens system 10.

Table 9 is a table of characteristics of the optical lens 10 of the present embodiment, in which data of focal length is obtained using visible light with a reference wavelength of 750nm, and data of refractive index of material and abbe number are obtained using visible light with a reference wavelength of 587.56nm, and units of Y radius, thickness, and focal length are all millimeters (mm).

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; the FOV is the maximum field angle of the optical lens 10.

Table 10 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 (S10, S11) of the optical lens 10 of example five, which are derived from the above-described surface-form formula (10) of the aspherical surfaces.

Table 10:

number of noodles	S10	S11
			K	－2.300E－01	－6.024E+01
A4	－9.027E－05	4.702E－04
			A6	－5.897E－05	－4.264E－05
A8	1.077E－05	7.365E－06
			A10	－5.216E－07	－8.127E－09
A12	－1.352E－10	－1.910E－08
			A14	0.000E+00	0.000E+00
A16	0.000E+00	0.000E+00
			A18	0.000E+00	0.000E+00
A20	0.000E+00	0.000E+00

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, and the ordinate represents the normalized field of view, and when the wavelengths given in fig. 10A are 950.0000nm, 750.0000nm, 656.2725nm, 587.5600nm, 546.0740nm, and 486.1327nm, respectively, the focus offsets of different fields of view are all within ± 0.1mm, 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 750.0000nm, 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 ± 50% when the wavelength is 750.0000nm, which shows that the distortion of the optical lens 10 in the present embodiment is better corrected and the imaging quality is better.

Example six:

referring to fig. 11 and 12, in the sixth 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 negative refractive power, the fifth lens element L5 has positive refractive power, and the sixth lens element L6 has positive refractive power.

In the sixth embodiment, the object-side surface S10 and the image-side surface S11 of the sixth lens element L6 are aspheric and made of glass, so as to improve the imaging quality of the optical lens system 10.

Table 11 is a table of characteristics of the optical lens 10 of the present embodiment, in which data of focal length is obtained using visible light with a reference wavelength of 750nm, and data of refractive index of material and abbe number are obtained using visible light with a reference wavelength of 587.56nm, and units of Y radius, thickness, and focal length are all millimeters (mm).

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; the FOV is the maximum field angle of the optical lens 10.

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 (S10, S11) of the optical lens 10 of example six, which are derived from the above-described surface-form formula (10) of the aspherical surfaces.

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, and the ordinate represents the normalized field of view, and when the wavelengths given in fig. 12A are 950.0000nm, 750.0000nm, 656.2725nm, 587.5600nm, 546.0740nm, and 486.1327nm, respectively, the focus offsets of different fields of view are all within ± 0.1mm, 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 750.0000nm, 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 ± 50% at a wavelength of 750.0000nm, which shows that the distortion of the optical lens 10 in the present embodiment is better corrected and the imaging quality is better.

With respect to the above relations (2) to (9), values in examples one to six are shown in table 13 below.

Table 13:

formula (II)	Example one	Example two	EXAMPLE III	Example four	EXAMPLE five	EXAMPLE six
							20＜f1＊f2/f＜50	26.291	28.795	46.173	30.975	27.312	22.829
0.6＜d23/d34＜5.2	0.960	1.032	5.183	4.122	3.106	0.632
							3.6＜CT3/Sags3＜8.7	5.980	3.609	3.706	6.772	8.428	8.626
6.6＜f45/f＜82.1	6.643	6.850	82.067	8.310	7.641	8.838
							2＜ImgH/Tan(FOV/2)＜3	2.718	2.707	2.932	2.942	2.926	2.881
0.7＜\|f123/f456\|＜6.8	0.832	0.718	0.881	2.379	5.364	6.748
							f/EPD≥2	2.000	2.000	2.000	2.000	2.000	2.000
5＜TTL/f＜7	5.841	5.814	6.173	5.651	5.775	6.558

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.

The electronic device comprises a shell and a camera module. The camera module is mounted on the housing.

The electronic device of the embodiment of the invention can be applied to vehicle-mounted, automatic driving and monitoring devices, wherein the electronic device includes, but is not limited to, an electronic device supporting imaging, such as a driving recorder, a smart phone, a tablet computer, a notebook computer, an electronic book reader, a Portable Multimedia Player (PMP), a portable phone, a video phone, a digital still camera, a mobile medical device, and a wearable device.

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 concave image-side surface near an optical axis;

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

a fourth 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 fifth 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 sixth lens element with positive refractive power;

the optical lens satisfies the following relation:

-17mm<f1<-8mm；

wherein f1 is the effective focal length of the first lens.

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

20mm<f1*f2/f<50mm；

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

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

0.6<d23/d34<5.2；

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

3.6<CT3/Sags3<8.7；

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

6.6<f45/f<82.1；

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

2mm<ImgH/Tan(FOV/2)<3mm；

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

0.7<|f123/f456|<6.8；

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

5<TTL/f<7；

9. 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 8; and

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

10. An electronic device, comprising:

a housing; and

the camera module of claim 9, said camera module mounted on said housing.