WO2022105926A1 - Optical lens and imaging device - Google Patents

Abstract

Provided are an optical lens (100, 200, 300, 400) and an imaging device (500), said optical lens (100, 200, 300, 400) comprising, in sequence, from the object side to the imaging plane: a first lens (L1) having a negative focal power, its object side face being a convex surface and its image side face being a concave surface; a second lens (L2) having a negative focal power, its object side face being a convex surface and its image side face being a concave surface; a third lens (L3) having a positive focal power, its object side face and image side face being convex surfaces; a stop; a fourth lens (L4) having a positive focal power, its image side face being a convex surface; a fifth lens (L5) having a negative focal power, its object side face being a concave surface, its image side face being a convex surface near the optical axis; a sixth lens (L6) having a negative focal power, its object side face being a convex surface near the optical axis, and its image side face being a concave surface near the optical axis. By means of reasonably matching the six lenses having specific focal powers and shapes, the field of view of the optical lens (100, 200, 300, 400) is caused to be greater than 150° and the total optical length is less than 6 mm, better balancing large wide angle, small size, and high pixel count, effectively enhancing the photography experience of the user.

Description

Optical Lenses and Imaging Equipment

cross reference

This application claims the priority of an earlier application with the title of invention: "Optical Lens and Imaging Device" filed on November 23, 2020, with application number 202011316802.5, the contents of the aforementioned earlier application are incorporated into this text by way of reference.

technical field

The present invention relates to the technical field of lens imaging, in particular to an optical lens and an imaging device.

Background technique

At present, with the popularization of portable electronic devices (such as smart phones, tablets, cameras), and the popularity of social, video, and live broadcast software, people's love for photography is getting higher and higher, and camera lenses have become the most important part of electronic devices. Standard, camera lens has even become the first consideration when consumers buy electronic equipment.

With the continuous development of mobile information technology, portable electronic devices such as mobile phones are also developing in the direction of ultra-wide-angle and ultra-high-definition imaging, which puts forward higher requirements for camera lenses mounted on portable electronic devices. However, in recent years, with the enthusiasm of consumers for taking pictures with mobile phones, the high-resolution of the rear camera has reached its peak. When developing towards higher pixels, it will encounter mutual constraints between the thinness of the mobile phone and the limitation of the total length of the camera. Therefore, it may become a wave to install ultra-wide-angle or even fisheye lenses on the rear of mobile phones; then how to achieve the balance of large wide-angle, high-pixel and small size of the camera lens has become an urgent problem to be solved.

SUMMARY OF THE INVENTION

Therefore, the purpose of the present invention is to provide an optical lens and an imaging device for solving the above problems.

The embodiments of the present invention implement the above-mentioned objects through the following technical solutions.

In a first aspect, the present invention provides an optical lens, comprising in sequence from the object side to the imaging surface along the optical axis: a first lens with negative refractive power, the object side of the first lens is a convex surface, the first lens The image side of the lens is concave; the second lens with negative refractive power, the object side of the second lens is convex, and the image side of the second lens is concave; the third lens with positive refractive power, the The object side and the image side of the third lens are convex; diaphragm; the fourth lens with positive refractive power, the object side of the fourth lens is concave or convex, and the image side of the fourth lens is convex; The fifth lens with negative refractive power, the object side of the fifth lens is concave, and the image side of the fifth lens is convex at the near optical axis; the sixth lens with negative refractive power, the sixth lens The object side of the lens is convex at the near optical axis, and the image side of the sixth lens is concave at the near optical axis; wherein, the total optical length of the optical lens is TTL<6.0mm, and the maximum field of view of the optical lens is Angle FOV≥150°.

In a second aspect, the present invention provides an imaging device, comprising an imaging element and the optical lens provided in the first aspect, where the imaging element is used to convert an optical image formed by the optical lens into an electrical signal.

Compared with the prior art, the optical lens and imaging device provided by the present invention can make the field of view of the optical lens reach more than 150° and the total optical length less than 6mm, the structure is more compact while satisfying high pixels, so as to better achieve the balance of large wide angle, small volume and high pixels, which can meet the needs of portable electronic devices and effectively improve the user's camera experience.

Description of drawings

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

1 is a schematic structural diagram of an optical lens in a first embodiment of the present invention;

Fig. 2 is the field curvature curve diagram of the optical lens in the first embodiment of the present invention;

3 is a graph of on-axis point spherical aberration chromatic aberration of the optical lens in the first embodiment of the present invention;

Fig. 4 is the vertical axis chromatic aberration curve diagram of the optical lens in the first embodiment of the present invention;

5 is a schematic structural diagram of an optical lens in a second embodiment of the present invention;

6 is a field curvature diagram of an optical lens in a second embodiment of the present invention;

7 is a graph of on-axis spherical aberration and chromatic aberration of an optical lens in a second embodiment of the present invention;

8 is a vertical-axis chromatic aberration curve diagram of an optical lens in a second embodiment of the present invention;

9 is a schematic structural diagram of an optical lens in a third embodiment of the present invention;

10 is a field curvature diagram of an optical lens in a third embodiment of the present invention;

11 is a graph of on-axis spherical aberration and chromatic aberration of the optical lens in the third embodiment of the present invention;

12 is a vertical-axis chromatic aberration curve diagram of an optical lens in a third embodiment of the present invention;

13 is a schematic structural diagram of an optical lens in a fourth embodiment of the present invention;

14 is a field curvature diagram of an optical lens in a fourth embodiment of the present invention;

15 is a graph of on-axis spherical aberration and chromatic aberration of the optical lens in the fourth embodiment of the present invention;

16 is a vertical-axis chromatic aberration curve diagram of the optical lens in the fourth embodiment of the present invention;

FIG. 17 is a schematic structural diagram of an imaging device provided by a fifth embodiment of the present invention.

Detailed ways

In order to make the objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Several embodiments of the invention are presented in the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

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

The invention provides an optical lens, which sequentially includes from the object side to the imaging surface along the optical axis: a first lens with negative refractive power, whose object side is convex, and whose image side is concave; a second lens with negative refractive power lens, the object side is convex, and its image side is concave; the third lens with positive refractive power, its object side and image side are convex; diaphragm; the fourth lens with positive refractive power, its object side is concave Or convex, its image side is convex; the fifth lens with negative power, its object side is concave, its image side is convex at the near optical axis; and the sixth lens with negative power, its object side It is a convex surface at the near optical axis, and its image side surface is a concave surface at the near optical axis; wherein, the total optical length of the optical lens is TTL<6.0mm, and the maximum field of view of the optical lens FOV≥150°. The optical lens of the present invention adopts six lenses with a specific refractive power, and adopts a specific surface shape and its matching, so that the lens can step into the ranks of fisheye lenses.

In some embodiments, the optical lens satisfies the following conditional formula:

0.994≤ET1/TC1≤4.135; (1)

Wherein, TC1 represents the center thickness of the first lens, and ET1 represents the edge thickness of the first lens. Satisfying the conditional formula (1) can make the light entering the optical system with a large field of view diverge, reduce the incident angle of the diaphragm surface, the light trend tends to be gentle, and the difficulty of aberration correction is reduced.

In some embodiments, the optical lens satisfies the following conditional formula:

0mm≤SAG12-SAG11≤0.843mm; (2)

Among them, SGA11 represents the edge sag of the object side of the first lens, and SAG12 represents the edge sag of the image side of the first lens. Satisfying the conditional formula (2), the coma aberration of the system can be reduced and the field of view angle of the system can be increased.

In some embodiments, the optical lens satisfies the following conditional formula:

0.89<f3/f<2.88; (3)

Wherein, f3 represents the focal length of the third lens, and f represents the focal length of the optical lens. Satisfying the conditional formula (3) can make the third lens have a larger positive refractive power, and make a major contribution to the correction of spherical aberration, which is beneficial to shorten the length of the lens and realize a small volume of the lens.

In some embodiments, the optical lens satisfies the following conditional formula:

1.1<f ₁₂₃ /f≤1.977; (4)

Wherein, f ₁₂₃ represents the combined focal length of the first lens, the second lens and the third lens, and f represents the focal length of the optical lens. Satisfying the conditional formula (4), it is possible to reasonably allocate the focal power of the first lens, the second lens and the third lens, slow down the trend of light turning, reduce the correction of advanced aberrations, and reduce the difficulty of the overall aberration correction of the lens .

In some embodiments, the optical lens satisfies the following conditional formula:

-0.531mm≤SAG42-SAG41<-0.12mm; (5)

Among them, SAG41 represents the edge sag of the object side of the fourth lens, and SAG42 represents the edge sag of the image side of the fourth lens. Satisfy the conditional formula (5), increase the optical path difference of the positive and negative light beams, balance the coma aberration of the system, and improve the resolution.

In some embodiments, the optical lens satisfies the following conditional formula:

Nd3≥1.54; (6)

Vd3≥55.9; (7)

Wherein, Nd3 represents the refractive index of the material of the third lens, and Vd3 represents the Abbe number of the third lens. Satisfying the conditional expressions (6) and (7) is favorable for chromatic aberration correction at short wavelengths.

In some embodiments, the optical lens satisfies the following conditional formula:

0≤R62/SAG62≤9.285; (8)

Among them, R62 represents the curvature radius of the image side surface of the sixth lens, and SAG62 represents the edge sag of the image side surface of the sixth lens. Satisfying the conditional formula (8) can improve the image quality of the off-axis field of view, reduce the off-axis spherical aberration, reduce the total length of the lens, and realize a small volume of the lens.

In some embodiments, the optical lens satisfies the following conditional formula:

0mm<SAG11≤0.477mm; (9)

Here, SGA11 represents the edge sag of the object side surface of the first lens. Satisfying the conditional formula (9) ensures that the object side of the first lens does not protrude from the lens barrel, which can effectively prevent the lens from being scratched during use.

In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all plastic aspherical lenses. Each lens adopts aspherical lens, which can not only make the lens have better imaging quality, but also make the structure of the lens more compact, so that it has a smaller volume.

The present invention will be further described below with a plurality of embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different. For details, please refer to the parameter table of each embodiment. The following examples are only preferred embodiments of the present invention, but the embodiments of the present invention are not only limited by the following examples, and any other changes, substitutions, combinations or simplifications that do not deviate from the innovations of the present invention, All should be regarded as equivalent replacement modes, and all are included in the protection scope of the present invention.

The surface shapes of the aspherical lenses in the various embodiments of the present invention all satisfy the following equations:

Among them, z is the distance vector height of the aspheric surface from the vertex of the aspheric surface when the height is h along the optical axis, c is the paraxial curvature radius of the surface, k is the quadratic surface coefficient, and A _2i is the 2i-order a Spherical coefficient.

first embodiment

Please refer to FIG. 1 , which is a schematic structural diagram of an optical lens 100 provided by a first embodiment of the present invention. The optical lens 100 sequentially includes a first lens L1 , a second lens L2 , a first lens L1 , a second lens L2 , a first lens L1 , a second lens L2 Three lenses L3, diaphragm ST, fourth lens L4, fifth lens L5, sixth lens L6 and infrared filter G1.

The first lens L1 has negative refractive power, the object side S1 of the first lens is convex, and the image side S2 of the first lens is concave;

The second lens L2 has negative refractive power, the object side S3 of the second lens is convex, and the image side S4 of the second lens is concave;

The third lens L3 has positive refractive power, the object side S5 of the third lens is convex, and the image side S6 of the third lens is convex;

The fourth lens L4 has positive refractive power, the object side S7 of the fourth lens is concave, and the image side S8 of the fourth lens is convex;

The fifth lens L5 has negative refractive power, the object side S9 of the fifth lens is a concave surface, and the image side S10 of the fifth lens is a convex surface at the near optical axis;

The sixth lens L6 is an M-type lens with negative refractive power, the object side S11 of the sixth lens is convex at the near optical axis, and the image side S12 of the sixth lens is concave at the near optical axis.

The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all plastic aspherical lenses. It should be noted that, in other embodiments, the first lens L1 to the sixth lens L6 may all be glass lenses, or may be a combination of plastic lenses and glass lenses.

The relevant parameters of each lens in the optical lens 100 provided by the first embodiment of the present application are shown in Table 1.

Table 1

Table 2 shows the surface shape coefficients of each aspherical surface of the optical lens 100 in this embodiment.

Table 2

Please refer to FIG. 2 , FIG. 3 , and FIG. 4 , which are respectively a field curvature curve diagram, an on-axis point spherical aberration and a vertical axis chromatic aberration curve diagram of the optical lens 100 .

The field curvature curve of FIG. 2 represents the degree of curvature of the meridional image plane and the sagittal image plane. Here, in FIG. 2 , the horizontal axis represents the offset (unit: mm), and the vertical axis represents the field angle (unit: degree). It can be seen from Figure 2 that the curvature of field of the meridional image plane and sagittal image plane is controlled within ±0.3mm.

The on-axis spherical aberration curve of FIG. 3 represents the aberration on the optical axis at the imaging plane. 3, the horizontal axis represents the spherical value (unit: mm), and the vertical axis represents the normalized field of view. It can be seen from FIG. 3 that the offset of the on-axis point spherical aberration is controlled within ±0.05mm, indicating that the optical lens 100 can effectively correct the aberration of the fringe field of view and the secondary spectrum of the entire image plane.

The vertical-axis chromatic aberration curve in FIG. 4 represents the chromatic aberration at different image heights on the imaging plane between the longest wavelength and the shortest wavelength. The horizontal axis in FIG. 4 represents the vertical axis chromatic aberration value (unit: um) of each wavelength relative to the central wavelength, and the vertical axis represents the normalized viewing angle. It can be seen from FIG. 4 that the vertical axis chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±16.0um, indicating that the vertical axis chromatic aberration of the optical lens 100 is well corrected.

Second Embodiment

Please refer to FIG. 5 , which is a schematic diagram of the structure of the optical lens 200 provided in this embodiment. The optical lens 200 in this embodiment is roughly the same in structure as the optical lens 100 in the first embodiment, and the difference is: sixth The lens is a meniscus lens, and the curvature radius and material selection of each lens are different.

The relevant parameters of each lens in the optical lens 200 provided in this embodiment are shown in Table 3.

table 3

Table 4 shows the surface shape coefficients of each aspherical surface of the optical lens 200 in this embodiment.

Table 4

Please refer to FIG. 6 , FIG. 7 , and FIG. 8 , which are respectively a field curvature graph, an on-axis spherical aberration graph, and a vertical-axis chromatic aberration graph of the optical lens 200 .

The field curvature curve of FIG. 6 represents the degree of curvature of the meridional image plane and the sagittal image plane. It can be seen from Fig. 6 that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.05mm, which indicates that the field curvature of the optical lens 200 is well corrected.

The on-axis spherical aberration curve of FIG. 7 represents the aberration on the optical axis at the imaging plane. It can be seen from FIG. 7 that the offset of the on-axis point spherical aberration is controlled within ±0.05mm, indicating that the optical lens 200 can effectively correct the aberration of the fringe field of view and the secondary spectrum of the entire image plane.

The vertical-axis chromatic aberration curve in FIG. 8 represents the chromatic aberration of the longest wavelength and the shortest wavelength at different image heights on the imaging plane. It can be seen from FIG. 8 that the vertical axis chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±2.0um, indicating that the vertical axis chromatic aberration of the optical lens 200 is well corrected.

Third Embodiment

Please refer to FIG. 9 , which is a schematic structural diagram of the optical lens 300 provided in this embodiment. The structure of the optical lens 300 in this embodiment is roughly the same as that of the optical lens 100 in the first embodiment, and the differences are: In this embodiment, the object side surface S7 of the fourth lens L4 of the optical mirror 300 is a convex surface, and the curvature radius and material selection of each lens are different.

The relevant parameters of each lens in the optical lens 300 provided in this embodiment are shown in Table 5.

table 5

Table 6 shows the surface shape coefficients of each aspherical surface of the optical lens 300 in this embodiment.

Table 6

Please refer to FIG. 10 , FIG. 11 , and FIG. 12 , which are respectively a field curvature graph, an on-axis spherical aberration graph, and a vertical-axis chromatic aberration graph of the optical lens 300 .

The field curvature curve of FIG. 10 represents the degree of curvature of the meridional image plane and the sagittal image plane. It can be seen from FIG. 10 that the curvature of field of the meridional image plane and the sagittal image plane is controlled within ±0.05mm, indicating that the field curvature of the optical lens 300 is well corrected.

The on-axis spherical aberration curve of FIG. 11 represents the aberration on the optical axis at the imaging plane. It can be seen from Fig. 11 that the offset of the on-axis point spherical aberration is controlled within ±0.01mm, indicating that the optical lens 300 can effectively correct the aberration of the fringe field of view and the secondary spectrum of the entire image plane.

The vertical-axis chromatic aberration curve in FIG. 12 represents the chromatic aberration at different image heights on the imaging plane between the longest wavelength and the shortest wavelength. It can be seen from FIG. 12 that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2.0um, indicating that the vertical axis chromatic aberration of the optical lens 300 is well corrected.

Fourth Embodiment

Please refer to FIG. 13 , which is a schematic structural diagram of the optical lens 400 provided in this embodiment. The optical lens 400 in this embodiment is roughly the same in structure as the optical lens 100 in the first embodiment, and the difference is: this The sixth lens L6 of the optical lens 400 in the embodiment is a meniscus lens with a concave surface facing the imaging surface, and the curvature radius and material selection of each lens are different.

The relevant parameters of each lens in the optical lens 400 in this embodiment are shown in Table 7.

Table 7

Table 8 shows the surface shape coefficients of each aspherical surface of the optical lens 400 in this embodiment.

Table 8

Please refer to FIG. 14 , FIG. 15 , and FIG. 16 , which are respectively a field curvature graph, an on-axis spherical aberration graph, and a vertical-axis chromatic aberration graph of the optical lens 400 .

The field curvature curve of FIG. 14 represents the degree of curvature of the meridional image plane and the sagittal image plane. It can be seen from FIG. 14 that the curvature of field of the meridional image plane and the sagittal image plane is controlled within ±0.05mm, indicating that the field curvature of the optical lens 400 is well corrected.

The on-axis spherical aberration curve of FIG. 15 represents the aberration on the optical axis at the imaging plane. It can be seen from FIG. 15 that the offset of the on-axis point spherical aberration is controlled within ±0.01mm, indicating that the optical lens 400 can effectively correct the aberration of the fringe field of view and the secondary spectrum of the entire image plane.

The vertical-axis chromatic aberration curve in FIG. 16 represents the chromatic aberration at different image heights on the imaging plane between the longest wavelength and the shortest wavelength. It can be seen from FIG. 16 that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±6.0um, indicating that the vertical axis chromatic aberration of the optical lens 400 is well corrected.

Please refer to Table 9. Table 9 is the optical characteristics corresponding to the above four embodiments, mainly including the focal length f, the aperture number F#, the total optical length TTL and the field angle 2θ, as well as the numerical values corresponding to each of the above conditional expressions.

Table 9

To sum up, the optical lens provided by the present invention has the following advantages:

(1) Using a combination of six lenses with a specific refractive power, and using a specific surface shape and its matching, the structure is more compact while meeting the wide viewing angle, thereby better achieving a balance between the miniaturization of the lens and the wide viewing angle.

(2) A larger area of the scene can be photographed, which brings great convenience to the later cropping. In addition, the optical lens of this design enhances the sense of depth and space of the imaging picture, and has better imaging quality.

Fifth Embodiment

As shown in FIG. 17 , a fifth embodiment of the present invention provides a schematic structural diagram of an imaging device 500 . The imaging device 500 includes an imaging element 510 and an optical lens (eg, the optical lens 100 ) in any of the foregoing embodiments. The imaging element 510 may be a CMOS (Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductor) image sensor, or may be a CCD (Charge Coupled Device, charge coupled device) image sensor.

The imaging device 500 may be a terminal device loaded with the above-mentioned optical lens, and the terminal device is, for example, a terminal device such as a smart phone, a smart tablet, and a smart reader.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present 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.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the patent of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (11)

1. An optical lens is characterized in that, along the optical axis from the object side to the imaging surface, it comprises: a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens and a sixth lens;

   The first lens has negative refractive power, the object side of the first lens is convex, and the image side of the first lens is concave;

   The second lens has negative refractive power, the object side of the second lens is convex, and the image side of the second lens is concave;

   The third lens has a positive refractive power, and both the object side and the image side of the third lens are convex;

   The fourth lens has a positive refractive power, the object side of the fourth lens is concave or convex, and the image side of the fourth lens is convex;

   The fifth lens has negative refractive power, the object side of the fifth lens is concave, and the image side of the fifth lens is convex at the near optical axis;

   The sixth lens has negative refractive power, the object side of the sixth lens is convex at the near optical axis, and the image side of the sixth lens is concave at the near optical axis;

   Wherein, the total optical length of the optical lens is TTL<6.0mm, and the maximum field of view angle of the optical lens is FOV≥150°.
2. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional formula:

   0.994≤ET1/TC1≤4.135;

   Wherein, TC1 represents the central thickness of the first lens, and ET1 represents the edge thickness of the first lens.
3. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional formula:

   0mm≤SAG12-SAG11≤0.843mm;

   Wherein, SAG11 represents the edge sag of the object side of the first lens, and SAG12 represents the edge sag of the image side of the first lens.
4. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional formula:

   0.89<f3/f<2.88;

   Wherein, f3 represents the focal length of the third lens, and f represents the focal length of the optical lens.
5. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional formula:

   1.1<f ₁₂₃ /f≤1.977;

   Wherein, f ₁₂₃ represents the combined focal length of the first lens, the second lens and the third lens, and f represents the focal length of the optical lens.
6. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional formula:

   -0.531mm≤SAG42-SAG41<-0.12mm;

   Wherein, SAG41 represents the edge sag of the object side of the fourth lens, and SAG42 represents the edge sag of the image side of the fourth lens.
7. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional formula:

   Nd3≥1.54; Vd3≥55.95;

   Wherein, Vd3 represents the Abbe number of the third lens, and Nd3 represents the refractive index of the material of the third lens.
8. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional formula:

   0≤R62/SAG62≤9.285;

   Wherein, R62 represents the curvature radius of the image side surface of the sixth lens, and SAG62 represents the edge sag of the image side surface of the sixth lens.
9. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional formula:

   0mm<SAG11≤0.477mm;

   Wherein, SGA11 represents the edge sag of the object side surface of the first lens.
10. The optical lens according to claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all It is a plastic aspherical lens.
11. An imaging device, characterized by comprising the optical lens according to any one of claims 1-10 and an imaging element, wherein the imaging element is used for converting an optical image formed by the optical lens into an electrical signal.

Images