Ultra-wide-angle small-head optical imaging system
By designing an ultra-wide-angle small-head optical imaging system including five aspherical lenses, the problem that traditional optical imaging systems cannot meet high resolution requirements is solved, and a smaller head size and a higher viewing angle is achieved, suitable for modern electronic products.
Patent Information
- Application Number
- CN202421341300.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-12
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-06-12
AI Technical Summary
Traditional optical imaging systems cannot meet the requirements of higher resolution optical lens systems.
An ultra-wide-angle small-head optical imaging system is designed, including five lenses arranged in sequence from the object side to the image side along the optical axis. The image side and object side of each lens are aspherical, and by optimizing the shape and optical parameters of the lens, it meets the specific focal length, radius of curvature, dispersion coefficient and thickness relationship.
While maintaining ultra-wide-angle imaging, it effectively shortens the head size of the imaging lens, improves the lens viewing angle, and provides high resolution, suitable for small or thin portable devices.
Smart Images
Figure CN222672033U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical imaging lenses, and in particular to an ultra-wide-angle small-head optical imaging system. Background Art
[0002] With the development of science and technology, people have higher and higher requirements for lens imaging. Miniaturization, high performance and high resolution have become the trend of modern electronic products such as mobile phones.
[0003] As the pixel size of electronic imaging sensors becomes smaller and smaller, people's requirements for angle and imaging are getting higher and higher. Traditional optical imaging systems cannot meet the requirements of higher resolution optical lens systems. Utility Model Content
[0004] The utility model aims to provide an ultra-wide-angle small-head optical imaging system to solve the technical problem that the traditional optical imaging system in the prior art cannot meet the requirements of a higher-resolution optical lens system.
[0005] In order to solve the above technical problems, the utility model specifically provides an ultra-wide-angle small-head optical imaging system, comprising a first lens, an aperture, a second lens, a third lens, a fourth lens, and a fifth lens arranged in sequence from the object side to the image side along the optical axis, and the image side surface and the object side surface of each lens are both aspherical surfaces;
[0006] The first lens has negative refractive power, and its object side surface is convex at the near optical axis;
[0007] The second lens has positive refractive power, and its object side surface is convex;
[0008] The third lens has negative refractive power, and its image side surface is concave;
[0009] The fourth lens has positive refractive power, its object side surface is concave at the near optical axis, and its image side surface is convex at the near optical axis;
[0010] The fifth lens has negative refractive power, and its object surface is convex near the optical axis;
[0011] The ultra-wide-angle small-head optical imaging system satisfies the relationship: -1.19<f / R4<-0.91, 79.21<V1+V3<79.21;
[0012] Wherein f is the focal length of the high-definition optical imaging lens, R4 is the radius of curvature of the object side of the fourth lens, V1 is the dispersion coefficient of the first lens, and V3 is the dispersion coefficient of the third lens.
[0013] As a preferred solution of the utility model, the ultra-wide-angle small-head optical imaging system also satisfies the relationship:
[0014] 6.81<(R1+R2) / (R1-R2)<7;
[0015] Wherein, R1 is the curvature radius of the object side surface of the first lens, and R2 is the curvature radius of the object side surface of the second lens.
[0016] As a preferred solution of the utility model, the ultra-wide-angle small-head optical imaging system also satisfies the relationship:
[0017] 0.46<(At1+At4+At6+At8) / TTL<0.47;
[0018] AT1, AT4, AT6, AT8 are the center thicknesses of the first lens, the second lens, the third lens, and the fourth lens, respectively, and TTL is the total optical length of the camera optical lens.
[0019] As a preferred solution of the utility model, the ultra-wide-angle small-head optical imaging system also satisfies the relationship:
[0020] -3.61 <ct1 / ct2<-3.37;
[0021] Wherein, CT1 is the thickness of the first lens on the optical axis, and CT2 is the thickness of the second lens on the optical axis.
[0022] As a preferred solution of the utility model, the ultra-wide-angle small-head optical imaging system also satisfies the relationship:
[0023] 2.16 <TTL / f<2.19。
[0024] As a preferred solution of the utility model, the ultra-wide-angle small-head optical imaging system also satisfies the relationship:
[0025] 1.67 <TL / Dg<1.76;
[0026] Among them, TL is the distance between the object side vertex of the first lens and the imaging plane, and Dg is the diagonal length of the image on the image plane at the maximum viewing angle of the lens group.
[0027] As a preferred solution of the utility model, the ultra-wide-angle small-head optical imaging system also satisfies the relationship:
[0028] -0.79 <f23 / f4<-0.77;
[0029] Wherein, f23 is the focal length of the combination of the second lens and the third lens, and f4 is the focal length of the fourth lens.
[0030] As a preferred solution of the utility model, the ultra-wide-angle small-head optical imaging system also satisfies the relationship:
[0031] 1.45 <CT4 / CT5<1.51
[0032] Wherein, CT4 is the center thickness of the fourth lens along the optical axis, and CT5 is the center thickness of the fifth lens along the optical axis.
[0033] As a preferred solution of the utility model, the ultra-wide-angle small-head optical imaging system also satisfies the relationship:
[0034] 0.95 <f12 / f5<1.12;
[0035] Wherein, f12 is the focal length of the first lens and the second lens combined, and f5 is the focal length of the fifth lens.
[0036] Compared with the prior art, the utility model has the following beneficial effects:
[0037] The ultra-wide-angle small-head high-definition imaging lens is a five-lens type. The surface structure of each lens is combined with the optimization range of optical parameters to effectively shorten the head size of the imaging lens and improve its lens viewing angle while maintaining ultra-wide angle and reducing imaging deformation during imaging. It has high resolution brought by high pixels. It is an optical imaging lens technology that integrates ultra-wide angle and small volume, so it can be used in small or thin portable devices that need to be equipped with high imaging quality equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0038] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.
[0039] Figure 1 It is a schematic diagram of an ultra-wide-angle small-head optical imaging system according to Embodiment 1 of the present utility model;
[0040] Figure 2 This is a graph of field curvature and distortion of the ultra-wide-angle small-head optical imaging system of the first embodiment of the utility model;
[0041] Figure 3 This is an axial aberration curve diagram of the ultra-wide-angle small-head optical imaging system of the first embodiment of the utility model;
[0042] Figure 4 It is a schematic diagram of an ultra-wide-angle small-head optical imaging system according to the second embodiment of the present utility model;
[0043] Figure 5This is a graph of field curvature and distortion of the ultra-wide-angle small-head optical imaging system of the second embodiment of the utility model;
[0044] Figure 6 This is an axial aberration curve diagram of the ultra-wide-angle small-head optical imaging system of the second embodiment of the utility model;
[0045] Figure 7 This is a schematic diagram of an ultra-wide-angle small-head optical imaging system according to Embodiment 3 of the present utility model;
[0046] Figure 8 This is a graph of field curvature and distortion of the ultra-wide-angle small-head optical imaging system of the third embodiment of the present utility model;
[0047] Fig. 9 This is an axial aberration curve diagram of the ultra-wide-angle small-head optical imaging system of the third embodiment of the utility model;
[0048] Fig.10 It is a schematic diagram of an ultra-wide-angle small-head optical imaging system according to a fourth embodiment of the present utility model;
[0049] Fig.11 This is a graph of field curvature and distortion of the ultra-wide-angle small-head optical imaging system according to the fourth embodiment of the present utility model;
[0050] Fig.12 This is an axial aberration curve diagram of the ultra-wide-angle small-head optical imaging system of Example 4 of the utility model.
[0051] The numbers in the figure represent the following:
[0052] First lens: 101, 201, 301, 401;
[0053] Aperture: 102, 202, 302, 402;
[0054] Second lens: 103, 203, 303, 403;
[0055] Third lens: 104, 204, 304, 404;
[0056] Fourth lens: 105, 205, 305, 405;
[0057] Fifth lens: 106, 206, 306, 406. DETAILED DESCRIPTION
[0058] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0059] The utility model specifically provides an ultra-wide-angle small-head optical imaging system, comprising a first lens, an aperture, a second lens, a third lens, a fourth lens, and a fifth lens arranged in sequence from the object side to the image side along the optical axis, wherein the image side surface and the object side surface of each lens are both aspherical surfaces;
[0060] The first lens has negative refractive power, and its object side surface is convex at the near optical axis;
[0061] The second lens has positive refractive power, and its object side surface is convex;
[0062] The third lens has negative refractive power, and its image side surface is concave;
[0063] The fourth lens has positive refractive power, its object side surface is concave at the near optical axis, and its image side surface is convex at the near optical axis;
[0064] The fifth lens has negative refractive power, and its object surface is convex near the optical axis;
[0065] The ultra-wide-angle small-head optical imaging system satisfies the relationship: -1.19<f / R4<-0.91, 79.21<V1+V3<79.21;
[0066] Wherein f is the focal length of the high-definition optical imaging lens, R4 is the radius of curvature of the object side of the fourth lens, V1 is the dispersion coefficient of the first lens, and V3 is the dispersion coefficient of the third lens.
[0067] As a preferred solution of the utility model, the ultra-wide-angle small-head optical imaging system also satisfies the relationship:
[0068] 6.81<(R1+R2) / (R1-R2)<7;
[0069] Wherein, R1 is the curvature radius of the object side surface of the first lens, and R2 is the curvature radius of the object side surface of the second lens.
[0070] As a preferred solution of the utility model, the ultra-wide-angle small-head optical imaging system also satisfies the relationship:
[0071] 0.46<(At1+At4+At6+At8) / TTL<0.47;
[0072] AT1, AT4, AT6, AT8 are the center thicknesses of the first lens, the second lens, the third lens, and the fourth lens, respectively, and TTL is the total optical length of the camera optical lens.
[0073] As a preferred solution of the utility model, the ultra-wide-angle small-head optical imaging system also satisfies the relationship:
[0074] -3.61 <ct1 / ct2<-3.37;
[0075] Wherein, CT1 is the thickness of the first lens on the optical axis, and CT2 is the thickness of the second lens on the optical axis.
[0076] As a preferred solution of the utility model, the ultra-wide-angle small-head optical imaging system also satisfies the relationship:
[0077] 2.16 <TTL / f<2.19。
[0078] As a preferred solution of the utility model, the ultra-wide-angle small-head optical imaging system also satisfies the relationship:
[0079] 1.67 <TL / Dg<1.76;
[0080] Among them, TL is the distance between the object side vertex of the first lens and the imaging plane, and Dg is the diagonal length of the image on the image plane at the maximum viewing angle of the lens group.
[0081] As a preferred solution of the utility model, the ultra-wide-angle small-head optical imaging system also satisfies the relationship:
[0082] -0.79 <f23 / f4<-0.77;
[0083] Wherein, f23 is the focal length of the combination of the second lens and the third lens, and f4 is the focal length of the fourth lens.
[0084] As a preferred solution of the utility model, the ultra-wide-angle small-head optical imaging system also satisfies the relationship:
[0085] 1.45 <CT4 / CT5<1.51
[0086] Wherein, CT4 is the center thickness of the fourth lens along the optical axis, and CT5 is the center thickness of the fifth lens along the optical axis.
[0087] As a preferred solution of the utility model, the ultra-wide-angle small-head optical imaging system also satisfies the relationship:
[0088] 0.95 <f12 / f5<1.12;
[0089] Wherein, f12 is the focal length of the first lens and the second lens combined, and f5 is the focal length of the fifth lens.
[0090] Embodiment 1:
[0091] See Reference Figures 1 to 3 , Figure 1 A schematic diagram of an ultra-wide-angle small-head optical imaging system according to Embodiment 1 of the present utility model is shown. Figure 2 The field curvature and distortion curves of the ultra-wide-angle small-head optical imaging system of the first embodiment of the utility model are shown from left to right. Figure 3 This is an axial aberration curve diagram of the ultra-wide-angle small-head optical imaging system of Example 1.
[0092] The ultra-wide-angle small-head optical imaging system in the first embodiment includes a first lens 101, an aperture 102, a second lens 103, a third lens 104, a fourth lens 105, and a fifth lens 106 arranged in sequence from the object side to the image side along the optical axis, and the image side surface and the object side surface of each lens are aspherical surfaces;
[0093] The surface shapes of each lens are as follows:
[0094] The first lens 101 has negative refractive power, and its object side surface is convex near the optical axis;
[0095] The second lens 103 has positive refractive power, and its object side surface is convex;
[0096] The third lens 104 has negative refractive power, and its image side surface is concave;
[0097] The fourth lens element 105 has positive refractive power, and its object side surface is concave near the optical axis, and its image side surface is convex near the optical axis;
[0098] The fifth lens element 106 has negative refractive power, and its object surface is convex near the optical axis;
[0099] The ultra-wide-angle small-head optical imaging system also includes an infrared filter, which is placed between the fifth lens 106 and the imaging surface. The infrared filter filters out infrared light entering the lens to prevent infrared light from irradiating the photosensitive chip and generating noise. Specifically, the infrared filter can be made of glass to avoid affecting the focal length.
[0100] Please refer to Table 1-1 and Table 1-2 below for coordination.
[0101]
[0102]
[0103]
[0104]
[0105] Table 1-1 is the detailed structural data of Example 1, where the units of curvature radius, thickness and focal length are millimeters, f is the focal length of the optical imaging lens group, Fno is the aperture value, and FOV is the maximum field of view angle of the optical imaging lens group.
[0106] Surfaces 0 to 14 represent surfaces from the object side to the image side, respectively, wherein surfaces 1-14 represent the object surface of the first lens 101, the image surface of the first lens 101, the aperture 102, the object surface of the second lens 103, the image surface of the second lens 103, the object surface of the third lens 104, the image surface of the third lens 104, the object surface of the fourth lens 105, the image surface of the fourth lens 105, the object surface of the fifth lens 106, the image surface of the fifth lens 106, the object surface of the infrared filter, the image surface of the infrared filter and the imaging surface.
[0107] Table 1-2 is the aspheric coefficient data in Example 1, wherein k represents the cone coefficient in the aspheric curve equation, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 represent the 4th, 6th, 8th, 10th, 12th, 14th, 16th, 18th and 20th order aspheric coefficients of each surface.
[0108] Embodiment 2:
[0109] See Reference Figures 4 to 6 , Figure 4 A schematic diagram of an ultra-wide-angle small-head optical imaging system according to a second embodiment of the present utility model is shown. Figure 5 The field curvature and distortion curves of the ultra-wide-angle small-head optical imaging system of the second embodiment of the present invention are shown from left to right. Figure 6 This is an axial aberration curve diagram of the ultra-wide-angle small-head optical imaging system of Example 2.
[0110] The ultra-wide-angle small-head optical imaging system in the second embodiment includes a first lens 201, an aperture 202, a second lens 203, a third lens 204, a fourth lens 205, and a fifth lens 206 arranged in sequence from the object side to the image side along the optical axis, and the image side surface and the object side surface of each lens are aspherical surfaces;
[0111] The surface shape of each lens is the same as that of the first embodiment.
[0112] Please refer to Table 2-1 and Table 2-2 below for coordination.
[0113]
[0114]
[0115]
[0116]
[0117] Embodiment three:
[0118] See Reference Figures 7 to 9 , Figure 7 A schematic diagram of an ultra-wide-angle small-head optical imaging system according to Embodiment 3 of the present utility model is shown. Figure 8 The field curvature and distortion curves of the ultra-wide-angle small-head optical imaging system of the third embodiment of the present utility model are shown from left to right. Fig. 9 This is an axial aberration curve diagram of the ultra-wide-angle small-head optical imaging system of Example 3.
[0119] The ultra-wide-angle small-head optical imaging system in the third embodiment includes a first lens 301, an aperture 302, a second lens 303, a third lens 304, a fourth lens 305, and a fifth lens 306 arranged in sequence from the object side to the image side along the optical axis, and the image side surface and the object side surface of each lens are aspherical surfaces;
[0120] The surface shape of each lens is the same as that of the first embodiment.
[0121] Please refer to Table 3-1 and Table 3-2 below for coordination.
[0122]
[0123]
[0124]
[0125]
[0126] Embodiment 4:
[0127] See Reference Figures 10 to 12 , Fig.10 A schematic diagram of an ultra-wide-angle small-head optical imaging system according to a fourth embodiment of the present utility model is shown. Fig.11 The field curvature and distortion curves of the ultra-wide-angle small-head optical imaging system of the fourth embodiment of the utility model are shown from left to right. Fig.12 This is an axial aberration curve diagram of the ultra-wide-angle small-head optical imaging system of Example 4.
[0128] The ultra-wide-angle small-head optical imaging system in the fourth embodiment includes a first lens 401, an aperture 402, a second lens 403, a third lens 404, a fourth lens 405, and a fifth lens 406 arranged in sequence from the object side to the image side along the optical axis, and the image side surface and the object side surface of each lens are aspherical surfaces;
[0129] The surface shape of each lens is the same as that of the first embodiment.
[0130] Please refer to Table 4-1 and Table 4-2 below for coordination.
[0131]
[0132]
[0133]
[0134]
[0135] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.
Claims
1. An ultra-wide-angle small-head optical imaging system, characterized in that: It includes a first lens, a stop, a second lens, a third lens, a fourth lens, and a fifth lens which are arranged in sequence from the object side to the image side along the optical axis, and the image side surface and the object side surface of each lens are both aspherical surfaces; The first lens has negative refractive power, and its object side surface is convex at the near optical axis; The second lens has positive refractive power, and its object side surface is convex; The third lens has negative refractive power, and its image side surface is concave; The fourth lens has positive refractive power, its object side surface is concave at the near optical axis, and its image side surface is convex at the near optical axis; The fifth lens has negative refractive power, and its object surface is convex near the optical axis; The ultra-wide-angle small-head optical imaging system satisfies the relationship: -1.19<f / R4<-0.91, 79.21<V1+V3<79.21; Wherein f is the focal length of the ultra-wide-angle small-head optical imaging system, R4 is the radius of curvature of the object side of the fourth lens, V1 is the dispersion coefficient of the first lens, and V3 is the dispersion coefficient of the third lens.
2. The ultra-wide-angle small-head optical imaging system according to claim 1, characterized in that: The ultra-wide-angle small-head optical imaging system also satisfies the relationship: 6.81<(R1+R2) / (R1-R2)<7; Wherein, R1 is the curvature radius of the object side surface of the first lens, and R2 is the curvature radius of the object side surface of the second lens.
3. The ultra-wide-angle small-head optical imaging system according to claim 1, characterized in that: The ultra-wide-angle small-head optical imaging system also satisfies the relationship: 0.46<(At1+At4+At6+At8) / TTL<0.47; AT1, AT4, AT6, AT8 are the center thicknesses of the first lens, the second lens, the third lens and the fourth lens respectively, and TTL is the total optical length of the ultra-wide-angle small-head optical imaging system.
4. The ultra-wide-angle small-head optical imaging system according to claim 1, characterized in that: The ultra-wide-angle small-head optical imaging system also satisfies the relationship: -3.61 <ct1 / ct2<-3.37; Wherein, CT1 is the thickness of the first lens on the optical axis, and CT2 is the thickness of the second lens on the optical axis.
5. The ultra-wide-angle small-head optical imaging system according to claim 1, characterized in that: The ultra-wide-angle small-head optical imaging system also satisfies the relationship: 2.16 <TTL / f<2.19。 6. The ultra-wide-angle small-head optical imaging system according to claim 1, characterized in that: The ultra-wide-angle small-head optical imaging system also satisfies the relationship: 1.67 <TL / Dg<1.76; Among them, TL is the distance between the object side vertex of the first lens and the imaging plane, and Dg is the diagonal length of the image on the image plane at the maximum viewing angle of the lens group.
7. The ultra-wide-angle small-head optical imaging system according to claim 1, characterized in that: The ultra-wide-angle small-head optical imaging system also satisfies the relationship: -0.79 <f23 / f4<-0.77; Wherein, f23 is the focal length of the combination of the second lens and the third lens, and f4 is the focal length of the fourth lens.
8. The ultra-wide-angle small-head optical imaging system according to claim 1, characterized in that: The ultra-wide-angle small-head optical imaging system also satisfies the relationship: 1.45 <CT4 / CT5<1.51 Wherein, CT4 is the center thickness of the fourth lens along the optical axis, and CT5 is the center thickness of the fifth lens along the optical axis.
9. The ultra-wide-angle small-head optical imaging system according to claim 1, characterized in that: The ultra-wide-angle small-head optical imaging system also satisfies the relationship: 0.95 <f12 / f5<1.12; Wherein, f12 is the focal length of the first lens and the second lens combined, and f5 is the focal length of the fifth lens.