Lens and camera device
By designing a simplified lens set structure and using a wedge lens for field curve correction, the problems of complex structure and poor field curve correction of existing optical lenses are solved, and a high-performance lens design is achieved.
Patent Information
- Application Number
- CN202421349580.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-13
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-06-13
AI Technical Summary
Existing optical lenses have problems such as complex lens set structure, high processing difficulty, poor manufacturing of free surfaces, and poor field curve correction, resulting in poor lens performance.
A lens is designed, and the first lens group and the second lens group are arranged in sequence from the object side to the image side, and the field curve correction is performed using a wedge lens, which simplifies the lens group structure and improves the ease of processing and manufacturing.
It realizes a lens with simple structure, easy processing and good field curve correction performance, and improves the imaging quality and performance of the lens.
Smart Images
Figure CN222439753U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical imaging, in particular to a lens and a camera device. Background Art
[0002] Thanks to the rapid development of security monitoring in recent years, optical lenses are increasingly used in the security field, especially in the fields of smart buildings and smart transportation, and the pixel requirements of optical imaging lenses are getting higher and higher. More and more companies are beginning to invest more in ultra-high definition research, hoping to develop products with higher pixels and smaller size.
[0003] The lenses in the related technology generally have the following problems: the lens group structure is complex, the technical processing is difficult, the manufacturability of the free-form surface is poor, the possibility of technology realization is small, the field curvature correction is poor, and the lens performance is poor. Utility Model Content
[0004] The embodiment of the utility model provides a lens and a camera device, which are used to provide a lens with simple structure, easy processing and good field curvature correction performance.
[0005] In a first aspect, an embodiment of the utility model provides a lens, wherein the lens is composed of a first lens group and a second lens group arranged in sequence from the object side to the image side; wherein:
[0006] The first lens group consists of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens arranged in sequence from the object side to the image side;
[0007] The second lens group consists of a ninth lens, a tenth lens and an eleventh lens arranged in sequence from the object side to the image side; wherein the tenth lens is a wedge lens.
[0008] Furthermore, the first lens is a positive focal length lens, the second lens is a positive focal length lens, the third lens is a negative focal length lens, the fourth lens is a positive focal length lens, the fifth lens is a negative focal length lens, the sixth lens is a positive focal length lens, the seventh lens is a positive focal length lens, and the eighth lens is a positive focal length lens; the ninth lens and the eleventh lens are both plane lenses.
[0009] Further, the first lens is a meniscus lens, and a surface thereof facing the object side is a convex surface;
[0010] The second lens is a convex lens, and the surface facing the object side is a convex surface;
[0011] The third lens is a meniscus lens, and the surface facing the object side is a convex surface;
[0012] The fourth lens is a meniscus lens, and a surface thereof facing the object side is a convex surface;
[0013] The fifth lens is a meniscus lens, and the surface facing the image side is a convex surface;
[0014] The sixth lens is a meniscus lens, and the surface facing the image side is a convex surface;
[0015] The seventh lens is a biconvex lens;
[0016] The eighth lens is a meniscus lens, and a surface thereof facing the object side is a convex surface.
[0017] Furthermore, the image-side surface of the tenth lens is perpendicular to the optical axis, and the object-side surface of the tenth lens is a plane and is not perpendicular to the optical axis.
[0018] Further, the first lens, the second lens, the seventh lens and the eighth lens are all aspherical lenses;
[0019] The third lens, the fourth lens, the fifth lens and the sixth lens are all glass spherical lenses.
[0020] Furthermore, the third lens and the fourth lens form a cemented lens group;
[0021] The fifth lens and the sixth lens form a cemented lens group.
[0022] Furthermore, a curvature radius of the object-side surface of the fourth lens is smaller than a curve radius of the image-side surface of the fourth lens.
[0023] Furthermore, the lens satisfies:
[0024] 0.8*|F3|≤|F4|≤1.5*|F3|;
[0025] 1.0*|F5|≤|F6|≤2.0*|F5|;
[0026] 0.9*F≤|F7|≤1.1*|F|; 2*|F78|≤|F12|≤3*|F78|;
[0027] Among them, F3 is the focal length of the third lens, F4 is the focal length of the fourth lens, F5 is the focal length of the fifth lens, F6 is the focal length of the sixth lens, F7 is the focal length of the seventh lens, F is the focal length of the lens, F12 is the focal length of the first sub-lens group composed of the first lens and the second lens, and F78 is the focal length of the second sub-lens group composed of the seventh lens and the eighth lens.
[0028] Furthermore, the focal length of the lens is 50 mm ± 10%, and the aperture is F1.0 ± 10%.
[0029] In a second aspect, an embodiment of the utility model provides a camera device, wherein the camera device comprises: using any of the lenses described above to perform imaging.
[0030] The embodiment of the utility model provides a lens and a camera device, wherein the lens is composed of a first lens group and a second lens group arranged in sequence from the object side to the image side; wherein: the first lens group is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens arranged in sequence from the object side to the image side; the second lens group is composed of a ninth lens, a tenth lens and an eleventh lens arranged in sequence from the object side to the image side; wherein the tenth lens is a wedge lens.
[0031] In an embodiment of the utility model, eleven lenses are arranged in a specific order from the object side to the image side in the lens, wherein the eleven lenses include three plane lenses, namely, the ninth lens, the tenth lens and the eleventh lens. The overall structure is simple, easy to process, and the possibility of structural realization is large. In addition, the utility model designs the tenth lens as a wedge lens. The wedge lens can make the lens more accurately correct the field curvature generated by objects at different object distances, and the wedge lens has higher manufacturability. Therefore, the utility model provides a lens with a simple structure, easy processing and good field curvature correction performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0033] Figure 1 A schematic diagram of the lens structure provided by an embodiment of the utility model;
[0034] Figure 2 A schematic diagram of a lens design optical path output provided by an embodiment of the utility model;
[0035] Figure 3 A schematic diagram of another optical path output of a lens design provided in an embodiment of the utility model;
[0036] Figure 4 A schematic diagram of an MTF curve for lens design evaluation provided by an embodiment of the present utility model;
[0037] Figure 5 A schematic diagram of a point list for lens design evaluation provided by an embodiment of the present utility model. DETAILED DESCRIPTION
[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0039] Figure 1 This is a schematic diagram of the lens structure provided by an embodiment of the utility model. The lens is composed of a first lens group G1 and a second lens group G2 arranged in sequence from the object side to the image side; wherein:
[0040] The first lens group G1 is composed of a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and an eighth lens L8, which are arranged in sequence from the object side to the image side;
[0041] The second lens group G2 consists of a ninth lens L9, a tenth lens L10 and an eleventh lens L11 which are arranged in sequence from the object side to the image side; wherein the tenth lens L10 is a wedge lens.
[0042] The optical axes of the lenses provided in the embodiment of the utility model coincide with each other.
[0043] The ninth lens is used to correct the color deviation of the optical system, the tenth lens is used to correct the field curvature aberration generated by the first lens group at a specific object distance, and the eleventh lens is used to simulate the protective glass of the sensor. The distance between the tenth lens and the image plane is greater than the preset distance threshold.
[0044] In an embodiment of the utility model, eleven lenses are arranged in a specific order from the object side to the image side in the lens, wherein the eleven lenses include three plane lenses, namely, the ninth lens, the tenth lens and the eleventh lens. The overall structure is simple, easy to process, and the possibility of structural realization is large. In addition, the utility model designs the tenth lens as a wedge lens. The wedge lens can make the lens more accurately correct the field curvature generated by objects at different object distances, and the wedge lens has higher manufacturability. Therefore, the utility model provides a lens with a simple structure, easy processing and good field curvature correction performance.
[0045] In order to further improve the imaging quality of the lens, in an embodiment of the utility model, the first lens is a positive focal length lens, the second lens is a positive focal length lens, the third lens is a negative focal length lens, the fourth lens is a positive focal length lens, the fifth lens is a negative focal length lens, the sixth lens is a positive focal length lens, the seventh lens is a positive focal length lens, and the eighth lens is a positive focal length lens; the ninth lens and the eleventh lens are both plane lenses.
[0046] The object side surface and image side surface of the ninth lens and the eleventh lens are both planes, and the object side surface and image side surface of the ninth lens and the eleventh lens are both perpendicular to the optical axis. The object side surface and image side surface of the tenth lens are both planes, the image side surface of the tenth lens is perpendicular to the optical axis, and the object side surface of the tenth lens is not perpendicular to the optical axis.
[0047] In order to further improve the field curvature correction performance of the lens, in the embodiment of the utility model, in the application scenario where there is an angle between the object plane and the optical axis of the lens, the angle is generally an acute angle between 0° and 90°. The thickness of the end of the tenth lens facing the angle is greater than the thickness of the other end; wherein the angle is the angle between the object plane and the optical axis of the lens. Figure 1 As shown, there is an angle between the object plane and the optical axis of the lens, the end of the angle facing the tenth lens is the upper end of the tenth lens, and the other end of the tenth lens is the lower end of the tenth lens. It should be noted that the upper end and the lower end of the tenth lens are represented by Figure 1 The upper and lower ends of the lens structure are shown.
[0048] The above setting of the tenth lens can achieve more accurate correction of the field curvature produced by objects at different object distances, and the physical center and the optical axis coincide with each other without rotation. In addition, the flat lens and the free-form surface with the same outer diameter are more manufacturable. That is, the tenth lens is more manufacturable.
[0049] In order to further improve the imaging quality of the lens, in an embodiment of the utility model, the first lens is a meniscus lens, and the surface thereof facing the object side is a convex surface;
[0050] The second lens is a convex lens, and the surface facing the object side is a convex surface;
[0051] The third lens is a meniscus lens, and the surface facing the object side is a convex surface;
[0052] The fourth lens is a meniscus lens, and a surface thereof facing the object side is a convex surface;
[0053] The fifth lens is a meniscus lens, and the surface facing the image side is a convex surface;
[0054] The sixth lens is a meniscus lens, and the surface facing the image side is a convex surface;
[0055] The seventh lens is a biconvex lens;
[0056] The eighth lens is a meniscus lens, and a surface thereof facing the object side is a convex surface.
[0057] In order to improve the processing performance of the lens, in the embodiment of the utility model, the first lens, the second lens, the seventh lens and the eighth lens are all aspherical lenses;
[0058] The third lens, the fourth lens, the fifth lens and the sixth lens are all glass spherical lenses.
[0059] In order to further make the system compact, in an embodiment of the utility model, the third lens and the fourth lens form a cemented lens group;
[0060] The fifth lens and the sixth lens form a cemented lens group.
[0061] Specifically, the object-side surface of the fourth lens is bonded to the image-side surface of the third lens; and the object-side surface of the sixth lens is bonded to the image-side surface of the fifth lens.
[0062] In order to further improve the imaging quality of the lens, in an embodiment of the utility model, the curvature radius of the object side surface of the fourth lens is smaller than the curve radius of the image side surface of the fourth lens.
[0063] In order to further improve the imaging quality of the lens, in the embodiment of the utility model, the lens meets the following requirements:
[0064] 0.8*|F3|≤|F4|≤1.5*|F3|;
[0065] 1.0*|F5|≤|F6|≤2.0*|F5|;
[0066] 0.9*F≤|F7|≤1.1*|F|; 2*|F78|≤|F12|≤3*|F78|;
[0067] Among them, F3 is the focal length of the third lens, F4 is the focal length of the fourth lens, F5 is the focal length of the fifth lens, F6 is the focal length of the sixth lens, F7 is the focal length of the seventh lens, F is the focal length of the lens, F12 is the focal length of the first sub-lens group composed of the first lens and the second lens, and F78 is the focal length of the second sub-lens group composed of the seventh lens and the eighth lens.
[0068] The focal length of the lens provided by the utility model is 50mm±10%, and the aperture is F1.0±10%.
[0069] On the other hand, an embodiment of the utility model provides a camera device, which comprises: using the above-mentioned lens to perform imaging.
[0070] The lens provided by the embodiment of the utility model adopts a combination design of a first lens group and a second lens group. Optionally, when there is an angle between the object plane and the optical axis of the lens, the wedge-shaped structure of the tenth lens of the second lens group can be used to accurately correct the field curvature produced by objects at different object distances. Through aberration correction, objects at different object distances all have good optical transfer functions, thereby realizing a lens design with a large depth of field.
[0071] The first lens group is described as follows:
[0072] The first lens group has a structure of 4G4GM, with a total of eight lenses, and the optical axes of all lenses in the entire lens coincide. 4G4GM means that it includes 4 glass spherical lenses and 4 aspherical lenses.
[0073] The first lens of the first lens group is arranged at a position closest to the object in the lens; the focal length of the first lens is positive, and the first lens is a meniscus lens, and the first lens is an aspherical lens.
[0074] The second lens of the first lens group is arranged on the image side of the first lens; the focal length of the second lens is positive, and the object surface of the second lens is convex; and the second lens is an aspherical lens.
[0075] The first lens group includes a third lens and a fourth lens, the third lens is arranged on the image side of the second lens, and the fourth lens is arranged on the image side of the third lens; the focal length of the third lens is negative, and the third lens is a meniscus lens; the focal length of the fourth lens is positive, and the fourth lens is a meniscus lens, the curvature radius of the object surface of the fourth lens is smaller than the curve radius of the image surface of the fourth lens; the object surface lens of the fourth spherical surface is bonded to the image surface of the third lens. The third lens and the fourth lens are both glass spherical lenses.
[0076] The focal lengths of the third lens and the fourth lens satisfy the following relationship: 0.8*|F3|≤|F4|≤1.5*|F3|;
[0077] Among them, F3 and F4 are the focal lengths of the third lens and the fourth lens respectively.
[0078] The first lens group also includes a fifth lens and a sixth lens, the fifth lens is arranged on the image side of the fourth lens, and the sixth lens is arranged on the image side of the fifth lens; the focal length of the fifth lens is negative, the focal length of the sixth lens is positive, and the fifth lens and the sixth lens are both meniscus lenses; the object lens of the sixth spherical surface is bonded to the image surface of the fifth lens. The fifth lens and the sixth lens are both glass spherical lenses.
[0079] The focal lengths of the fifth lens and the sixth lens satisfy the following relationship: 1.0*|F5|≤|F6|≤2.0*|F5|;
[0080] Among them, F5 and F6 are the focal lengths of the fifth lens and the sixth lens respectively.
[0081] The first lens group further includes a seventh lens, which is disposed on the image side of the sixth spherical surface; the focal length of the seventh lens is positive, and the seventh lens is a biconvex lens. The seventh lens is an aspherical lens;
[0082] The first lens group further includes an eighth lens, which is disposed on the image side of the seventh spherical surface; the focal length of the eighth lens is positive, and the eighth lens is a meniscus lens. The eighth lens is an aspherical lens;
[0083] The focal lengths of the first lens, the second lens, the seventh lens and the eighth lens satisfy the following relationship:
[0084] 0.9*F≤|F7|≤1.1*|F|; 2*|F78|≤|F12|≤3*|F78|;
[0085] Among them, F12 is the focal length of the first sub-lens group composed of the first lens L1 and the second lens L2, F78 is the focal length of the second sub-lens group composed of the seventh lens L7 and the eighth lens L8, and F is the focal length of the complete optical system.
[0086] The second lens group is described as follows:
[0087] The second lens group consists of a ninth lens, a tenth lens and an eleventh lens arranged in sequence from the object side to the image side; wherein the ninth lens and the eleventh lens are both plane lenses, and the tenth lens is a wedge lens.
[0088] There is an angle between the object plane and the optical axis of the lens, the image side surface of the tenth lens is perpendicular to the optical axis, and the object side surface of the tenth lens is a plane and is not perpendicular to the optical axis. The thickness of the tenth lens at one end facing the angle is greater than the thickness at the other end; wherein the angle is the angle between the object plane and the optical axis of the lens.
[0089] The following is an example of lens parameters provided in the embodiment of the present invention.
[0090] Embodiment 1:
[0091] In a specific implementation process, the surface type, curvature radius / inclination angle, thickness, refractive index nd, and Abbe constant vd of each lens of the lens meet the conditions listed in Table 1:
[0092] Surface number Surface type Curvature radius / inclination angle thickness nd vd 1 Inclined surface 20° 1.7543E+04 - - 2 Aspheric 25.886 7.571 1.62 58.2 3 Aspheric 23.355 9.815 4 Aspheric 59.234 6.027 1.62 582 5 Aspheric -702.593 9.550 6 Standard surface 19.603 4.603 1.91 35.3 7 Standard surface 11.023 6.599 1.52 64.2 8 Standard surface 15.309 4.629 STO Standard surface INF 10.701 10 Standard surface -15.019 5.889 1.85 23.8 11 Standard surface -32.580 3.479 1.60 65.5 12 Standard surface -16.838 0.100 13 Aspheric 37.489 10.824 1.59 673 14 Aspheric -76.716 10.858 15 Aspheric 22.206 8.433 1.77 49.3 16 Aspheric 21.179 5.320 17 Standard surface INF 0.300 1.52 64.2 18 Standard surface INF 1.981 19 Inclined surface 0.57° 0.500 1.52 64.2 20 Standard surface INF 1.981 21 Standard surface INF 0.800 1.52 64.2 22 Standard surface INF 0.238 23 IMA INF -
[0093] Table 1
[0094] The surface numbers in Table 1 are numbered according to the order of the surfaces of each lens. "STO" represents the aperture of the lens. The radius of curvature represents the degree of curvature of the corresponding lens surface. A positive value represents that the surface is bent toward the image plane, and a negative value represents that the surface is bent toward the object plane. "INF" indicates that the surface is a plane and the radius of curvature is infinite. The thickness represents the central axial distance from the current surface to the next surface. The refractive index represents the ability of the material between the current surface and the next surface to deflect light. The space represents that the current position is air and the refractive index is 1. Surface 1 is an inclined object plane with an inclination angle of 20°, simulating the actual monitoring object plane of the camera. The angle between the object plane and the optical axis is 20°. Surface 19 is an inclined surface with an inclination angle of 1.3°. It forms the tenth lens with surface 20, which is used to correct the field curvature aberration generated by the first lens group under surface 1, obtain a good optical transfer function, and achieve a large depth of field imaging effect.
[0095] The first lens, the second lens, the seventh lens and the eighth lens are all glass aspherical lenses, and the mirror shapes are defined by the following formula:
[0096]
[0097]
[0098] Among them, z is the sagittal height parallel to the optical axis, c is the curvature, k is the cone coefficient, c j is x m y n The correlation coefficients are shown in Table 2 below:
[0099] Surface number k c4 c6 c8 2 0.011152 -7.680168831676E-06 -1.509370400556E-08 1.479409224823E-11 3 0.011634 -1.227018770920E-05 -3.006358443035E-08 8.786716788084E-11 4 0.108939 -7.572314572566E-09 6.008299925223E-10 -4.552434310631E-13 5 78.793725 -1.275227887735E-07 -8.151673624952E-10 -1.616817411437E-13 13 -0.002316 -3.189377220197E-07 -2.832737010695E-09 -1.564134796613E-11 14 1.589630 -7.023149284959E-07 -4.109070092392E-09 -1.639581084215E-11 15 0.056826 -6.597760713076E-07 9.457499472204E-09 -1.312812508372E-11 16 0.753436 7.600814274749E-06 -3.924556750481E-08 1.772435392502E-09 Serial number c10 c12 c14 c16 2 -3.484197793100E-14 -2.113310405168E-16 6.381681965038E-19 -5.456942540876E-22 3 -4.380079881585E-13 4.868494335130E-16 6.873443356439E-19 -1.506416501465E-21 4 -3.386421324094E-15 -7.492804489048E-18 2.997551870492E-21 1.035504208565E-23 5 2.812788729468E-15 -2.808891708246E-18 -5.020412005609E-20 -7.707381351627E-23 13 -5.095583885996E-14 1.487934214341E-16 2.763377194331E-18 -3.108042441981E-21 14 -6.928215795977E-15 4.180657023794E-17 1.915931723392E-18 3.335868581070E-21 15 -9.665215306835E-14 -1.229708876172E-15 -7.043570405193E-18 -3.320776071167E-21 16 -1.775946947146E-12 -5.260763888124E-14 -4.132733184657E-16 -5.008446123794E-18
[0100] Table 2
[0101] Figure 2 A schematic diagram of a lens design optical path output provided by an embodiment of the utility model, Figure 3 This is another lens design optical path output schematic diagram provided by the embodiment of the utility model. Figure 2 and Figure 3 It can be seen that the lens can accurately correct the field curvature caused by objects at different object distances, thereby improving the field curvature correction performance of the lens.
[0102] Figure 4 The MTF curve diagram for lens design evaluation provided by the embodiment of the utility model is shown in FIG. Figure 4 It can be seen that the optical transfer function (MTF) curve of the lens is smoother and more concentrated; it can be seen that the lens provided by the embodiment of the utility model can meet higher imaging requirements.
[0103] Figure 5 A schematic diagram of the point arrangement of lens design evaluation provided by the embodiment of the utility model. Figure 5 It can be seen that the lens spot radius is small and more concentrated, and the corresponding aberration and coma are also better.
[0104] The utility model adopts a combination design of a first lens group and a second lens group, wherein the tenth lens of the second lens group is a wedge-shaped structure with continuous different thicknesses, which can correct the field curvature generated at different object distances, and through aberration correction, the object surface at different object distances has a good optical transfer function, realizing a large depth of field lens design. Compared with the solution of combining a meniscus lens and a free-form surface, the lens provided by the utility model has higher manufacturability, realizability, and higher cost performance.
[0105] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.
[0106] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
Claims
1. A lens, characterized in that: The lens is composed of a first lens group and a second lens group arranged in sequence from the object side to the image side; wherein: The first lens group consists of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens arranged in sequence from the object side to the image side; The second lens group consists of a ninth lens, a tenth lens and an eleventh lens arranged in sequence from the object side to the image side; wherein the tenth lens is a wedge lens.
2. The lens according to claim 1, characterized in that: The first lens is a positive focal length lens, the second lens is a positive focal length lens, the third lens is a negative focal length lens, the fourth lens is a positive focal length lens, the fifth lens is a negative focal length lens, the sixth lens is a positive focal length lens, the seventh lens is a positive focal length lens, and the eighth lens is a positive focal length lens; the ninth lens and the eleventh lens are both plane lenses.
3. The lens according to claim 1 or 2, characterized in that: The first lens is a meniscus lens, and the surface facing the object side is a convex surface; The second lens is a convex lens, and the surface facing the object side is a convex surface; The third lens is a meniscus lens, and the surface facing the object side is a convex surface; The fourth lens is a meniscus lens, and a surface thereof facing the object side is a convex surface; The fifth lens is a meniscus lens, and the surface facing the image side is a convex surface; The sixth lens is a meniscus lens, and the surface facing the image side is a convex surface; The seventh lens is a biconvex lens; The eighth lens is a meniscus lens, and a surface thereof facing the object side is a convex surface.
4. The lens according to claim 1, wherein: The image-side surface of the tenth lens is perpendicular to the optical axis, and the object-side surface of the tenth lens is a plane and is not perpendicular to the optical axis.
5. The lens according to claim 1, wherein: The first lens, the second lens, the seventh lens and the eighth lens are all aspherical lenses; The third lens, the fourth lens, the fifth lens and the sixth lens are all glass spherical lenses.
6. The lens according to claim 1, wherein: The third lens and the fourth lens form a cemented lens group; The fifth lens and the sixth lens form a cemented lens group.
7. The lens according to claim 1, wherein: The curvature radius of the object-side surface of the fourth lens is smaller than the curve radius of the image-side surface of the fourth lens.
8. The lens according to claim 1, wherein: The lens meets the following requirements: 0.8*|F3|≤|F4|≤1.5*|F3|; 1.0*|F5|≤|F6|≤2.0*|F5|; 0.9*F≤|F7|≤1.1*|F|; 2*|F78|≤|F12|≤3*|F78|; Among them, F3 is the focal length of the third lens, F4 is the focal length of the fourth lens, F5 is the focal length of the fifth lens, F6 is the focal length of the sixth lens, F7 is the focal length of the seventh lens, F is the focal length of the lens, F12 is the focal length of the first sub-lens group composed of the first lens and the second lens, and F78 is the focal length of the second sub-lens group composed of the seventh lens and the eighth lens.
9. The lens according to claim 1, wherein: The focal length of the lens is 50 mm ± 10%, and the aperture is F1.0 ± 10%.
10. A camera device, characterized in that: The imaging device comprises: using the lens according to any one of claims 1 to 9 to perform imaging.