WO2022233304A1 - Optical imaging lens and imaging device - Google Patents

Abstract

An optical imaging lens (100) and an imaging device (400). The optical imaging lens (100) consists of seven lenses, and sequentially comprises, along an optical axis from an object side to an imaging surface: a first lens (L1) having positive focal power, wherein an object side surface (S1) is a convex surface and an image side surface (S2) is a concave surface; a second lens (L2) having negative focal power, wherein both an object side surface (S3) and an image side surface (S4) are concave surfaces; a third lens (L3) having positive focal power, wherein an object side surface (S5) is a convex surface; a stop (ST); a fourth lens (L4) having positive focal power, wherein both an object side surface (S7) and an image side surface (S8) are convex surfaces; a fifth lens (L5) having positive focal power, wherein both an object side surface (S9) and an image side surface are convex surfaces; a sixth lens (L6) having negative focal power, wherein both an object side surface and an image side surface (S11) are concave surfaces; and a seventh lens (L7) having positive focal power, wherein an object side surface (S12) is a convex surface and an image side surface (S13) is a concave surface. The seven lenses are all glass lenses. The optical imaging lens (100) has the advantages of high resolution, a long focal length, and small distortion.

Description

Optical imaging lens and imaging equipment

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese Application No. 202110488005.3, filed on May 6, 2021, which is hereby incorporated by reference in its entirety for all purposes.

technical field

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

Background technique

With the development of autonomous driving technology, ADAS (Advanced Driver Assistant System) has become the standard configuration of many cars; among them, the on-board camera lens, as the key component of ADAS, can sense the road conditions around the vehicle in real time and realize the The performance of functions such as collision warning, lane deviation warning, and pedestrian detection directly affects the safety factor of ADAS. Therefore, the performance requirements for vehicle camera lenses are getting higher and higher.

The optical lens applied to the front of the vehicle carried in ADAS is mainly to identify the situation in front of the vehicle. It is required to clearly distinguish obstacles at a distance of 100 meters and realize collision warning. At present, the vehicle lens used for target recognition in front of the vehicle is often designed for close-range targets, and its field of view is relatively large. Although this type of lens can image close-range targets well, it can image distant targets. The effect is poor, the recognition accuracy of medium and long-distance targets cannot be taken into account, the effective target recognition range is reduced, and it is difficult to meet the requirements for the forward preview distance of the car when driving at a high speed.

SUMMARY OF THE INVENTION

Therefore, the purpose of the present invention is to propose an optical imaging lens and imaging device, which have the advantages of small angle, long focal length and low distortion, and can provide high-definition imaging effect at the same time. The imaging quality and recognition accuracy of the target.

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 imaging lens, which is composed of seven lenses, the optical imaging lens sequentially includes from the object side to the imaging surface along the optical axis: a first lens with positive refractive power, the first lens The object side of the lens is convex, and the image side of the first lens is concave; the second lens with negative refractive power, the object side and the image side of the second lens are concave; the third lens with positive refractive power lens, the object side of the third lens is convex; the diaphragm; the fourth lens with positive refractive power, the object side and the image side of the fourth lens are convex; the fifth lens with positive refractive power, so The object side and the image side of the fifth lens are convex; the sixth lens with negative refractive power, the object side and the image side of the sixth lens are concave; the seventh lens with positive refractive power, the The object side of the seventh lens is convex, the image side of the seventh lens is concave; and a filter is arranged between the seventh lens and the imaging surface; wherein, the first lens, the second lens The lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all glass lenses.

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

Compared with the prior art, the optical imaging lens provided by the present invention adopts seven lenses with a specific shape and refractive power, so that the lens has the advantages of high pixel, long focal length and small distortion, and can effectively correct the aberration of the fringe field of view, Thereby, the resolution capability of the edge of the optical imaging lens is improved, and the lens is composed of all-glass lenses, so that the optical imaging lens has good thermal stability, and still has good imaging ability in the case of low and high temperature.

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 imaging lens in a first embodiment of the present invention;

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

3 is an axial chromatic aberration curve diagram of the optical imaging lens in the first embodiment of the present invention;

4 is a vertical-axis chromatic aberration curve diagram of the optical imaging lens in the first embodiment of the present invention;

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

Fig. 6 is the distortion curve diagram of the optical imaging lens in the second embodiment of the present invention;

7 is an axial chromatic aberration curve diagram of the optical imaging lens in the second embodiment of the present invention;

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

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

10 is a distortion curve diagram of an optical imaging lens in a third embodiment of the present invention;

11 is an axial chromatic aberration curve diagram of the optical imaging lens in the third embodiment of the present invention;

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

FIG. 13 is a schematic structural diagram of an imaging device provided by a fourth 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 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. Throughout the specification, the same reference numerals refer to the same elements.

The present invention provides an optical imaging lens, which is composed of seven lenses. The optical imaging lens includes, in order from the object side to the imaging surface along the optical axis: a first lens, a second lens, a third lens, a diaphragm, a fourth lens, The fifth lens, the sixth lens, the seventh lens and the filter.

Wherein, the first lens has positive 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, and both the object side and the image side of the second lens are concave;

The third lens has positive refractive power, and the object side surface of the third lens is convex;

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

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

The sixth lens has negative refractive power, the object side and the image side of the sixth lens are concave, and the fifth lens and the sixth lens form a cemented body;

The seventh lens has positive refractive power, the object side of the seventh lens is convex, and the image side of the seventh lens is concave.

The thermal stability of the glass material lens is more stable. In order to make the lens have better thermal stability, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all glass lens. Of course, other combinations of lens materials that can achieve the above effects are also feasible.

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

6.5<TTL/BFL<8;(1)

TTL/D<4.5;(2)

Among them, TTL represents the total optical length of the optical imaging lens, BFL represents the vertical distance from the apex of the image side surface of the seventh lens to the imaging surface, and D represents the effective aperture of the optical imaging lens.

Satisfying the above conditional expressions (1) and (2) can achieve a longer focal length under the condition of properly lengthening the length of the lens and constraining the effective aperture of the lens, and achieve better cooperation with specific modules and high-pixel chips, Make the lens have good resolution.

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

2.0 < f _L1 /f <4.5; (3)

-0.9＜f _L2 /f＜-0.5; (4)

3 < f _L3 /f <4.5; (5)

0.8<f _L4 /f<1; (6)

1.45 < f _L5 /f <1.70; (7)

-0.8<f _L6 /f<-0.5; (8)

1.8 < f _L7 /f <2.2; (9)

Among them, f represents the focal length of the optical imaging lens, f _L1 represents the focal length of the first lens, f _L2 represents the focal length of the second lens, f _L3 represents the focal length of the third lens, f _L4 represents the focal length of the fourth lens, and f _L5 represents the focal length of the first lens. The focal length of the five lenses, f _L6 represents the focal length of the sixth lens, and f _L7 represents the focal length of the seventh lens.

Satisfying the above conditional expressions (3) to (9) can basically limit the combination of the focal length and surface shape of the seven lenses to achieve the effect of telephoto of the lens, and at the same time, it can effectively reduce the aberration of the lens, so that the lens has a higher resolution. like ability.

In some embodiments, in order to reasonably limit the ability of the first and second lenses to condense light beams, the optical imaging lens satisfies the following conditional formula:

2.5＜|f ₁ /f _L1 +f ₃ /f _L2 |＜6.5; (10)

R ₃ /f ₃ +R ₄ /f ₄ <0.01; (11)

Among them, f ₁ represents the focal length of the object side of the first lens, f ₃ represents the focal length of the object side of the second lens, f ₄ represents the focal length of the image side of the second lens, f _L1 represents the focal length of the first lens, and f _L2 represents _The focal length of the second lens, _R3 represents the radius of curvature of the object side of the second lens, and R4 represents the radius of curvature of the image side of the second lens.

Satisfying the above conditional expressions (10) and (11) can effectively reduce the incident angle of the incident light, thereby reducing the rear end volume of the lens; and the first lens is a convex lens, and the second lens is a concave lens, which can greatly reduce the overall Distortion of the optical system; while satisfying the conditional formula (10), the sum of the radius of curvature and the focal length ratio of the object surface and the image surface of the second lens is controlled to be close to zero, which is convenient for the correction of the subsequent lens aberrations of the system.

In some embodiments, in order to effectively control the distortion of the lens, the optical imaging lens satisfies the following conditional formula:

θ/IH ² <0.02rad/mm ² ; (12)

Among them, θ represents the half angle of view of the optical imaging lens (unit: radian), and IH represents the image height corresponding to the optical imaging lens at the half angle of view θ.

Satisfying the above conditional formula (12) can make the imaging system have negative distortion and control it within -2%, indicating that the lens has a larger image height in the edge field of view. better imaging results.

In some embodiments, the fifth lens and the sixth lens form a cemented lens group, and the fifth lens and the sixth lens satisfy the following conditional formula:

0.3＜|R ₁₀ /f _L56 |＜0.5; (13)

Vd ₅ -Vd ₆ <40; (14)

Among them, R ₁₀ represents the radius of curvature of the cemented surface of the cemented lens group, f _L56 represents the focal length of the cemented lens group, Vd ₅ represents the Abbe number of the fifth lens, and Vd ₆ represents the Abbe number of the sixth lens.

Satisfying the above conditional expressions (13) and (14) can effectively correct the chromatic aberration of the lens, and at the same time control the curvature radius of the bonding surface of the cemented body composed of the fifth lens and the sixth lens, which can effectively reduce the magnification chromatic aberration of the edge field of view .

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

2.2 <ET ₆ /CT ₆ <3.8; (15)

-2.2<R ₁₀ /R ₁₁ <-1.1; (16)

1.2 < d ₁₀ /d ₁₁ <1.4; (17)

Among them, ET ₆ represents the edge thickness of the sixth lens, CT ₆ represents the center thickness of the sixth lens, R ₁₀ represents the curvature radius of the cemented surface of the cemented lens group, R ₁₁ represents the curvature radius of the image side of the sixth lens, d ₁₀ represents the effective aperture on the object side of the sixth lens, and d ₁₁ represents the effective aperture on the image side of the sixth lens.

Satisfying the above conditional expressions (15) to (17), the sixth lens can be in the shape of a concave lens to achieve cementation with the fifth lens and reduce chromatic aberration; at the same time, the lens aperture of the sixth lens is constrained, which also constrains the beam. The aperture reduces the incident angle of the chief ray and facilitates the imaging of the rear system.

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

0.72 < ET ₇ /CT ₇ <0.82; (18)

0.33 < R ₁₂ /R ₁₃ <0.42; (19)

1.1 < d ₁₂ /d ₁₃ <1.2; (20)

Among them, ET ₇ represents the edge thickness of the seventh lens, CT ₇ represents the center thickness of the seventh lens, R ₁₂ represents the radius of curvature of the object side of the seventh lens, R ₁₃ represents the curvature radius of the image side of the seventh lens, d ₁₂ represents the effective aperture of the object side of the seventh lens, and d ₁₃ represents the effective aperture of the image side of the seventh lens.

Satisfying the above conditional expressions (18) to (20), the seventh lens can have a meniscus structure, which does not cause large aberrations and properly restricts the ratio of edge thickness to center thickness, making it easy to process. At the same time, because the seventh lens is a glass aspheric lens, it can effectively correct the spherical aberration, field curvature, distortion and other aberrations generated by the front lens, so that the image at the edge will be clearer.

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

10mm<f<16mm;(21)

25°<FOV<45°;(22)

Among them, f represents the focal length of the optical imaging lens, and FOV represents the maximum field of view of the optical imaging lens. Satisfying the above conditional expressions (21) and (22) indicates that the lens has the characteristics of a long focal length and a small angle of view, and can realize high-definition imaging at a relatively long distance.

Compared with spherical lenses, aspherical lenses have superior ability to correct spherical aberration. In order to improve the imaging quality of the lens and realize the miniaturization of the lens volume, some non-curved lenses are used in the optical imaging lens. Specifically, in some embodiments Among them, the fourth lens and the seventh lens are glass aspherical lenses, and the first lens, the second lens, the third lens, the fifth lens and the sixth lens are all glass spherical lenses.

Satisfying the above configuration is beneficial to ensure that the optical imaging lens has high pixels, long focal length, and small distortion, and at the same time effectively corrects the aberration of the edge field of view, thereby improving the edge resolution capability of the imaging lens, and the lens is made of all-glass lenses. composition, so that this optical imaging lens has good thermal stability, and still has good imaging ability in the case of low and high temperature.

The surface shapes of the aspheric surfaces of the optical imaging lens described in the present invention all satisfy the following equations:

Among them, z represents the distance of the surface from the vertex of the surface in the direction of the optical axis, c represents the curvature of the vertex of the surface, K represents the quadratic surface coefficient, h represents the distance from the optical axis to the surface, and B, C, D, E and F represent the four Order, sixth, eighth, tenth, and twelfth order surface coefficients.

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 imaging 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.

first embodiment

Please refer to FIG. 1 , which is a schematic structural diagram of an optical imaging lens 100 provided by a first embodiment of the present invention. The optical imaging lens 100 sequentially includes a first lens L1 and a second lens L2 along the optical axis from the object side to the imaging surface: a first lens L1 and a second lens L2 , a third lens L3, a diaphragm ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.

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

The second lens L2 has negative refractive power, and both the object side S3 and the image side S4 of the second lens are concave.

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

The fourth lens L4 has positive refractive power, and both the object side S7 and the image side S8 of the fourth lens are convex.

The fifth lens L5 has positive refractive power, and both the object side S9 and the image side of the fifth lens are convex.

The sixth lens L6 has negative refractive power, the object side and the image side S11 of the sixth lens are both concave, and the fifth lens L5 and the sixth lens L6 are cemented into a cemented body, and the image side of the fifth lens and the sixth lens are The object side is glued to form the adhesive surface S10.

The seventh lens L7 has positive refractive power, the object side S12 of the seventh lens is convex, and the image side S13 is concave.

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

Table 1

In this embodiment, the parameters of the aspheric surfaces of each lens of the optical imaging lens 100 are shown in Table 2.

Table 2

face number	K	B	C	D	E	F
S7	8.67E-01	-7.02E-05	-2.39E-07	1.35E-08	-5.24E-10	8.26E-12
S8	3.47E-01	1.99E-04	-9.23E-07	4.65E-08	-1.05E-09	1.30E-11
S12	3.15E+00	7.81E-04	-2.76E-06	-1.83E-07	1.29E-08	-1.76E-10
S13	1.41E+01	1.03E-03	2.74E-06	-1.18E-07	1.06E-08	-2.60E-11

In this embodiment, the curves of distortion, axial chromatic aberration and vertical chromatic aberration of the optical imaging lens 100 are respectively shown in FIG. 2 , FIG. 3 , and FIG. 4 .

Please refer to FIG. 2 , which shows the F-tanθ distortion diagram of the optical imaging lens 100 provided by the first embodiment of the present invention. It can be seen from the figure that the F-tanθ distortion of the lens is negative and less than -1%, and is negative distortion, indicating that the distortion of the optical imaging lens 100 is well corrected.

Please refer to FIG. 3 , which is an axial chromatic aberration curve diagram of the optical imaging lens 100 provided by the first embodiment of the present invention. It can be seen from the figure that the offset of the chromatic aberration is controlled within ±0.02 mm, indicating that the optical imaging The lens 100 can effectively correct the aberrations of the fringe field of view and the secondary spectrum of the entire image plane.

Please refer to FIG. 4 , which is a graph of the vertical axis chromatic aberration of the optical imaging lens 100 provided by the first embodiment of the present invention. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±3 microns , indicating that the vertical axis chromatic aberration of the optical imaging lens 100 is well corrected.

Second Embodiment

Please refer to FIG. 5 , which is a schematic structural diagram of an optical imaging lens 200 according to a second embodiment of the present invention. The optical imaging lens 200 in this embodiment is almost the same as the optical imaging lens 100 in the first embodiment, the difference is that the distance between the third lens L3 and the fourth lens L4 of the optical imaging lens 200 in this embodiment is relatively As well as the curvature radius and material selection of each lens are different, the specific parameters of each lens are shown in Table 2-1.

Table 3 shows the relevant parameters of each lens of the optical imaging lens 200 provided in this embodiment.

table 3

The parameters of the aspheric surfaces of each lens of the optical imaging lens 200 of this embodiment are shown in Table 4.

Table 4

face number	K	B	C	D	E	F
S7	1.21E+00	-6.34E-05	-3.70E-07	3.20E-08	-8.66E-10	1.36E-11
S8	2.09E-01	2.01E-04	-5.65E-07	4.20E-08	-8.93E-10	1.41E-11
S12	1.23E+00	6.35E-04	-9.70E-07	-9.33E-08	5.84E-09	-3.89E-11
S13	-2.52E+01	9.56E-04	1.93E-06	2.75E-07	-1.65E-08	7.42E-10

Please refer to FIG. 6 , which shows the F-tanθ distortion diagram of the optical imaging lens 200 provided by the second embodiment of the present invention. It can be seen from the figure that the F-tanθ distortion of the lens is negative and less than -1%, and is negative distortion, indicating that the distortion of the optical imaging lens 200 is well corrected.

Please refer to FIG. 7 , which shows the axial chromatic aberration curve diagram of the optical imaging lens 200 provided by the second embodiment of the present invention. It can be seen from the figure that the offset of the chromatic aberration is controlled within ±0.02 mm, indicating that the optical imaging The lens 200 can effectively correct the aberrations of the fringe field of view and the secondary spectrum of the entire image plane.

Please refer to FIG. 8 , which is a graph of the vertical chromatic aberration of the optical imaging lens 200 provided by the second embodiment of the present invention. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2.5 microns , indicating that the vertical axis chromatic aberration of the optical imaging lens 200 is well corrected.

Third Embodiment

Please refer to FIG. 9 , which is a structural diagram of an optical imaging lens 300 provided in this embodiment. The optical imaging lens 300 in this embodiment is almost the same as the optical imaging lens 100 in the first embodiment, the difference is that the image side surface of the third lens L3 of the optical imaging lens 300 in this embodiment is a convex surface, and each The curvature radius and material selection of the lens are different.

Table 5 shows the relevant parameters of each lens of the optical imaging lens 300 provided in this embodiment.

table 5

The parameters of the aspheric surfaces of each lens of the optical imaging lens 300 of this embodiment are shown in Table 6.

Table 6

face number	K	B	C	D	E	F
S7	-5.64E-05	-2.10E-06	1.11E-07	-3.47E-09	3.01E-11	-5.64E-05
S8	1.25E-04	-3.92E-06	2.21E-07	-6.15E-09	5.85E-11	1.25E-04
S12	4.43E-04	3.29E-06	-1.52E-07	1.00E-08	-8.59E-11	4.43E-04
S13	6.34E-04	-4.00E-06	1.19E-06	-7.44E-08	2.34E-09	6.34E-04

Please refer to FIG. 10, which shows the F-tanθ distortion diagram of the optical imaging lens 300 provided by the third embodiment of the present invention. It can be seen from the figure that the F-tanθ distortion of the lens is negative and less than -2%, and is negative distortion, indicating that the distortion of the optical imaging lens 300 is well corrected.

Please refer to FIG. 11 , which is an axial chromatic aberration curve diagram of the optical imaging lens 300 provided by the third embodiment of the present invention. It can be seen from the figure that the offset of the chromatic aberration is controlled within ±0.04 mm, indicating that the optical imaging The lens 300 can effectively correct the aberrations of the fringe field of view and the secondary spectrum of the entire image plane.

Please refer to FIG. 12 , which is a vertical-axis chromatic aberration curve diagram of the optical imaging lens 300 provided by the third embodiment of the present invention. It can be seen from the figure that the vertical-axis chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±3.5 μm In the following, it is explained that the vertical axis chromatic aberration of the optical imaging lens 300 is well corrected.

Please refer to Table 4, which shows the optical characteristics corresponding to the optical imaging lenses provided in the above three embodiments, including the focal length f of the lens, the total optical length TTL, the field angle FOV and the aperture number F#, and also includes the above conditional formulas. The associated value for each conditional expression.

Table 7

	Example 1	Example 2	Example 3
f(mm)	13.57	13.59	13.68
TTL(mm)	38	38	38
FOV(°)	33.2	33.2	33.2
F#	1.6	1.6	1.6
TTL/BFL	6.723284	7.153614	7.880547
TTL/D	4.479505	4.474663	4.445817
f L1 /f	2.918378	4.067079	2.518725
f L2 /f	-0.80924	-0.79236	-0.77947
f L3 /f	4.348736	3.499797	3.094852
f L4 /f	0.906564	0.912938	0.892983
f L5 /f	1.584305	1.525645	1.647295
f L6 /f	-0.66887	-0.6789	-0.6685
f L7 /f	2.082668	1.865702	1.882267
|f 1 /f L1 +f 3 /f L2 |	3.742657	2.904755	6.033230
R 3 /f 3 +R 4 /f 4	-2.10942E-15	-2.44249E-15	0
θ/IH 2	0.017822	0.017822	0.017822
ET6 / CT6	2.402511	2.313808	3.511547
R10 / R11	-2.037294	-1.752372	-1.345775
d 10 /d 11	1.345478	1.294763	1.217952
ET7 / CT7	0.758476	0.783007	0.798191
R12 / R13	0.355937	0.385574	0.402230

d 12 /d 13	1.121925	1.165974	1.165204
|R 10 /f L56 |	0.464849	0.356922	0.355474
Vd 5 -Vd 6	29.44	29.44	31.62

To sum up, in the present invention, the first lens and the second lens are used for light collection, reducing the incident angle of the incident light, which is beneficial to reducing the size of the lens and facilitating the subsequent correction of aberrations by the imaging system; the second lens is a double lens. The concave spherical lens is mainly used to correct the distortion of the first lens, and the condensed light can be incident smoothly, which is conducive to reducing the tolerance; the third lens is a positive lens with close sagittal heights on both sides, which can effectively reduce the impact caused by the lens. The fourth lens is a biconvex aspheric lens, which is mainly used to correct the spherical aberration and coma caused by the lens group in front of the diaphragm; the fifth lens and the sixth lens cooperate to eliminate the field curvature. The fifth lens has positive refractive power and uses high refractive index glass material, the sixth lens has negative refractive power and uses low refractive index glass material, which is beneficial to reduce spherical aberration and lateral chromatic aberration, and the relative difference between the sixth lens and the seventh lens The partial dispersion deviates from Abbe's empirical formula is large, which is beneficial to correct the secondary spectrum, so that the imaging system can have a good imaging effect in a wide range of visible light; the seventh lens is a meniscus aspheric lens, which is mainly used for correction Distortion and astigmatism, increase optical back focus. Each lens is a glass lens, so that the lens has good thermal stability and mechanical strength, which is beneficial to work in extreme environments.

Fourth Embodiment

Referring to FIG. 13 , an imaging device 400 according to a fourth embodiment of the present invention is shown. The imaging device 400 may include an imaging element 410 and an optical imaging lens (eg, the optical imaging lens 100 ) in any of the above embodiments. The imaging element 410 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 400 may be a vehicle-mounted camera device, a mobile phone, a tablet computer, or any other electronic device in which the above-mentioned optical imaging lens is mounted.

The imaging device 400 provided in this embodiment of the present application includes the optical imaging lens 100 . Since the optical imaging lens 100 has the advantages of high pixels, long focal length, and small distortion, and can effectively correct the aberration of the fringe field of view, the optical imaging lens 100 has the advantages of The imaging device 400 also has the advantages of high pixels, long focal length, and small distortion, and can effectively correct the aberration of the fringe field of view.

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 more 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 imaging lens, which is composed of seven lenses, is characterized in that, the optical imaging lens includes sequentially from the object side to the imaging surface along the optical axis:

   a first lens with positive refractive power, the object side of the first lens is convex, and the image side of the first lens is concave;

   a second lens with negative refractive power, the object side and the image side of the second lens are both concave;

   a third lens with positive refractive power, the object side surface of the third lens is convex;

   aperture;

   a fourth lens with positive refractive power, wherein both the object side and the image side of the fourth lens are convex;

   a fifth lens with positive refractive power, wherein the object side and the image side of the fifth lens are convex;

   a sixth lens with negative refractive power, the object side and the image side of the sixth lens are both concave;

   A seventh lens with positive refractive power, the object side of the seventh lens is convex, and the image side of the seventh lens is concave;

   Wherein, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all glass lenses.
2. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional formula:

   6.5<TTL/BFL<8;

   TTL/D<4.5;

   Wherein, TTL represents the total optical length of the optical imaging lens, BFL represents the vertical distance from the apex of the image side surface of the seventh lens to the imaging surface, and D represents the effective aperture of the optical imaging lens.
3. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional formula:

   2.0＜f _L1 /f＜4.5;

   -0.9＜f _L2 /f＜-0.5;

   3<f _L3 /f<4.5;

   0.8<f _L4 /f<1;

   1.45＜f _L5 /f＜1.70;

   -0.8＜f _L6 /f＜-0.5;

   1.8＜f _L7 /f＜2.2;

   Wherein, f represents the focal length of the optical imaging lens, f _L1 represents the focal length of the first lens, f _L2 represents the focal length of the second lens, f _L3 represents the focal length of the third lens, and f _L4 represents the focal length of the The focal length of the fourth lens, f _L5 represents the focal length of the fifth lens, f _L6 represents the focal length of the sixth lens, and f _L7 represents the focal length of the seventh lens.
4. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional formula:

   2.5＜|f ₁ /f _L1 +f ₃ /f _L2 |＜6.5;

   R ₃ /f ₃ +R ₄ /f ₄ <0.01;

   Wherein, f ₁ represents the focal length of the object side of the first lens, f ₃ represents the focal length of the object side of the second lens, f ₄ represents the focal length of the image side of the second lens, and f _L1 represents the focal length of the second lens. The focal length of a lens, f _L2 represents the focal length of the second lens, R ₃ represents the radius of curvature of the object side of the second lens, and R ₄ represents the radius of curvature of the image side of the second lens.
5. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional formula:

   θ/IH ² <0.02rad/mm ² ;

   Wherein, θ represents the half angle of view of the optical imaging lens, and IH represents the corresponding image height of the optical imaging lens at the half angle of view θ.
6. The optical imaging lens according to claim 1, wherein the fifth lens and the sixth lens form a cemented lens group, and the optical imaging lens satisfies the following conditional formula:

   0.3＜|R ₁₀ /f _L56 |＜0.5;

   Vd ₅ -Vd ₆ <40;

   Wherein, R ₁₀ represents the radius of curvature of the cemented surface of the cemented lens group, f _L56 represents the focal length of the cemented lens group, Vd ₅ represents the Abbe number of the fifth lens, and Vd ₆ represents the sixth lens the Abbe number.
7. The optical imaging lens according to claim 1, wherein the fifth lens and the sixth lens form a cemented lens group, and the optical imaging lens satisfies the following conditional formula:

   2.2＜ET ₆ /CT ₆ ＜3.8;

   -2.2<R ₁₀ /R ₁₁ <-1.1;

   1.2<d ₁₀ /d ₁₁ <1.4;

   Wherein, ET ₆ represents the edge thickness of the sixth lens, CT ₆ represents the center thickness of the sixth lens, R ₁₀ represents the radius of curvature of the cemented surface of the cemented lens group, and R ₁₁ represents the sixth lens The curvature radius of the image side surface, d ₁₀ represents the effective aperture of the object side surface of the sixth lens, and d ₁₁ represents the effective aperture of the image side surface of the sixth lens.
8. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional formula:

   0.72＜ET ₇ /CT ₇ ＜0.82;

   0.33＜|R ₁₂ /R ₁₃ |＜0.42;

   1.1<d ₁₂ /d ₁₃ <1.2;

   Wherein, ET ₇ represents the edge thickness of the seventh lens, CT ₇ represents the center thickness of the seventh lens, R ₁₂ represents the curvature radius of the object side surface of the seventh lens, and R ₁₃ represents the For the curvature radius of the image side surface, d ₁₂ represents the effective aperture of the object side surface of the seventh lens, and d ₁₃ represents the effective aperture of the image side surface of the seventh lens.
9. The optical imaging lens according to claim 1, wherein the fourth lens and the seventh lens are both aspherical lenses, the first lens, the second lens, the third lens, Both the fifth lens and the sixth lens are spherical lenses.
10. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional formula:

    10mm<f<16mm;

    25°<FOV<45°;

    Wherein, f represents the focal length of the optical imaging lens, and FOV represents the maximum field angle of the optical imaging lens.
11. An imaging device, characterized in that it comprises an optical imaging lens and an imaging element according to any one of claims 1-10, wherein the imaging element is used for converting an optical image formed by the optical imaging lens into an electrical signal.

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