Optical scanning imaging system
By designing an optical scanning imaging system including four aspherical lenses and a diaphragm, the problems of image distortion and poor light transmission in the prior art are solved, and the imaging effect with high resolution and wide viewing angle is achieved, and it is suitable for small portable devices.
Patent Information
- Application Number
- CN202421341292.0
- 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
In the existing scanning imaging technology, the image distortion is large, resulting in greater deformation of the scanned pictures and texts, and the plastic is less transmissive than glass, causing the scanning lens to be matte and the imaging effect is poor.
An optical scanning imaging system is designed, including four lenses and a diaphragm arranged along the same optical axis. The object side and image side of each lens are aspherical. The optical parameters of the lens group are optimized to meet specific relationships to optimize the imaging effect.
While maintaining high imaging quality, shorten the overall size of the imaging lens, enhance the lens viewing angle, and provide high resolution. It is suitable for small or thin portable devices.
Smart Images
Figure CN222672035U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical imaging, in particular to an optical scanning imaging system. Background Art
[0002] With the development of science and technology, people have higher and higher requirements for scanning imaging. Whether it is scanning text or images and photos, the requirements for the clarity and color of scanning imaging are constantly improving.
[0003] The existing scanning imaging technology has large image distortion, which will cause large deformation of the scanned image. The light transmittance of plastic is poorer than that of glass, which will cause stray light after scanning by the scanning lens and poor imaging effect. Utility Model Content
[0004] The purpose of the utility model is to provide an optical scanning imaging system to solve the technical problems in the prior art that the scanning imaging technology has large image distortion, which will cause large deformation of the scanned image, and the light transmittance of plastic is poor compared to that of glass, which will cause stray light after scanning by the scanning lens and poor imaging effect.
[0005] In order to solve the above technical problems, the utility model specifically provides an optical scanning imaging system, comprising a first lens, a second lens, a third lens, an aperture and a fourth lens arranged in sequence from the object side to the image side along the same optical axis, and the object side surface and the image side surface of each lens are aspherical surfaces;
[0006] The first lens has negative refractive power and its object side surface is convex near the optical axis;
[0007] The second lens has negative refractive power and its object side is convex;
[0008] The third lens has positive refractive power and its image side surface is concave;
[0009] The fourth lens has positive refractive power, its object side surface is convex near the optical axis, and its image side surface is convex near the optical axis;
[0010] The optical scanning imaging system includes a system that satisfies the relationship:
[0011] -0.111<f / R4<-0.091, 74.215<V1+V3<74.215;
[0012] Among them, 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 Abbe number of the first lens, and V3 is the Abbe number of the third lens.
[0013] As a preferred solution of the present utility model, the optical scanning imaging system also satisfies the following relationship:
[0014] 0.135 <f / TTL<0.149;
[0015] TTL is the total optical length of the camera optical lens;
[0016] As a preferred solution of the present utility model, the optical scanning imaging system also satisfies the following relationship:
[0017] 0.814 <SAG12 / T12<0.959;
[0018] SAG12 is the sag height of the image side surface of the first lens at the maximum effective radius, and T12 is the air space on the optical axis between the first lens and the second lens.
[0019] As a preferred solution of the present utility model, the optical scanning imaging system also satisfies the following relationship:
[0020] 0.149 <T34 / AAT<0.155;
[0021] T34 is the air gap between the image side surface of the third lens and the object side surface of the fourth lens on the optical axis, and AAT is the sum of the air gaps between adjacent lenses from the first lens to the fourth lens.
[0022] As a preferred solution of the present utility model, the optical scanning imaging system also satisfies the following relationship:
[0023] -0.089 <f / (f1+f4)<-0.066;
[0024] f1 is the focal length of the first lens, and f4 is the focal length of the fourth lens.
[0025] As a preferred solution of the present utility model, the optical scanning imaging system also satisfies the following relationship:
[0026] -0.089 <f / f123<-0.066;
[0027] f123 is the combined focal length of the first lens, the second lens and the third lens.
[0028] As a preferred solution of the present utility model, the optical scanning imaging system also satisfies the following relationship:
[0029] 0.933 <f4 / CT4<0.946;
[0030] f4 is the focal length of the fourth lens, and CT4 is the thickness of the fourth lens on the optical axis.
[0031] Compared with the prior art, the utility model has the following beneficial effects:
[0032] The optical scanning imaging system in the utility model is a four-lens type, and the surface structure of each lens is combined with the optimization range of optical parameters, which can effectively shorten the overall size of the imaging lens and improve its lens viewing angle while maintaining high imaging quality, and has high resolution brought by high pixels. The utility model is an optical scanning imaging lens technology with a wide viewing angle and a large aperture, which is provided for small or thin portable devices that need to be equipped with high imaging quality equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] 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.
[0034] Figure 1 It is a schematic diagram of an optical scanning imaging system according to a first embodiment of the present utility model;
[0035] Figure 2 The field curvature and distortion curve diagram of the optical scanning imaging system of the first embodiment of the utility model;
[0036] Figure 3 is an axial aberration curve diagram of the optical imaging lens assembly of the first embodiment of the utility model;
[0037] Figure 4 It is a schematic diagram of an optical scanning imaging system according to a second embodiment of the present utility model;
[0038] Figure 5 The field curvature and distortion curve diagram of the optical scanning imaging system of the second embodiment of the utility model;
[0039] Figure 6 is an axial aberration curve diagram of the optical imaging lens assembly of the second embodiment of the utility model;
[0040] Figure 7 It is a schematic diagram of an optical scanning imaging system according to a third embodiment of the present utility model;
[0041] Figure 8 The field curvature and distortion curve diagram of the optical scanning imaging system of the third embodiment of the utility model;
[0042] Fig. 9 This is an axial aberration curve diagram of the optical imaging lens assembly of the third embodiment of the utility model;
[0043] Fig.10It is a schematic diagram of an optical scanning imaging system according to a fourth embodiment of the present utility model;
[0044] Fig.11 The field curvature and distortion curve diagram of the optical scanning imaging system of the fourth embodiment of the utility model;
[0045] Fig.12 This is an axial aberration curve diagram of the optical imaging lens assembly of the fourth embodiment of the utility model.
[0046] The numbers in the figure represent the following:
[0047] First lens: 101, 201, 301, 401;
[0048] Second lens: 102, 202, 302, 402;
[0049] Third lens: 103, 203, 303, 403;
[0050] Aperture: 104, 204, 304, 404;
[0051] Fourth lens: 105, 205, 305, 405. DETAILED DESCRIPTION
[0052] 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.
[0053] The utility model specifically provides an optical scanning imaging system, comprising a first lens, a second lens, a third lens, an aperture and a fourth lens arranged in sequence from the object side to the image side along the same optical axis, wherein the object side surface and the image side surface of each lens are both aspherical surfaces;
[0054] Specifically, the surface shapes of each lens are as follows:
[0055] The first lens has negative refractive power and its object side surface is convex near the optical axis;
[0056] The second lens has negative refractive power and its object side is convex;
[0057] The third lens has positive refractive power and its image side surface is concave;
[0058] The fourth lens has positive refractive power, its object side surface is convex near the optical axis, and its image side surface is convex near the optical axis;
[0059] The optical scanning imaging system includes a system that satisfies the relationship:
[0060] -0.111<f / R4<-0.091, 74.215<V1+V3<74.215;
[0061] Among them, 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 Abbe number of the first lens, and V3 is the Abbe number of the third lens.
[0062] The optical scanning imaging system in the utility model is a four-lens type, and the surface structure of each lens is combined with the optimization range of optical parameters, which can effectively shorten the overall size of the imaging lens and improve its lens viewing angle while maintaining high imaging quality, and has high resolution brought by high pixels. The utility model is an optical scanning imaging lens technology with a wide viewing angle and a large aperture, which is provided for small or thin portable devices that need to be equipped with high imaging quality equipment.
[0063] As a preferred solution of the utility model, the optical scanning imaging system also satisfies the following relationship:
[0064] 0.135 <f / TTL<0.149;
[0065] TTL is the total optical length of the camera optical lens;
[0066] As a preferred solution of the utility model, the optical scanning imaging system also satisfies the following relationship:
[0067] 0.814 <SAG12 / T12<0.959;
[0068] SAG12 is the sag height of the image side surface of the first lens at the maximum effective radius, and T12 is the air space on the optical axis between the first lens and the second lens.
[0069] As a preferred solution of the utility model, the optical scanning imaging system also satisfies the following relationship:
[0070] 0.149 <T34 / AAT<0.155;
[0071] T34 is the air gap between the image side surface of the third lens and the object side surface of the fourth lens on the optical axis, and AAT is the sum of the air gaps between adjacent lenses from the first lens to the fourth lens.
[0072] As a preferred solution of the utility model, the optical scanning imaging system also satisfies the following relationship:
[0073] -0.089 <f / (f1+f4)<-0.066;
[0074] f1 is the focal length of the first lens, and f4 is the focal length of the fourth lens.
[0075] As a preferred solution of the utility model, the optical scanning imaging system also satisfies the following relationship:
[0076] -0.089 <f / f123<-0.066;
[0077] f123 is the combined focal length of the first lens, the second lens and the third lens.
[0078] As a preferred solution of the utility model, the optical scanning imaging system also satisfies the following relationship:
[0079] 0.933 <f4 / CT4<0.946;
[0080] f4 is the focal length of the fourth lens, and CT4 is the thickness of the fourth lens on the optical axis.
[0081] Embodiment 1
[0082] See Reference Figures 1 to 3 , Figure 1 A schematic diagram of an optical scanning imaging system according to a first embodiment of the utility model is shown. Figure 2 The field curvature and distortion curves of the optical scanning imaging system of the first embodiment of the utility model are shown from left to right. Figure 3 1 is an axial aberration curve diagram of the optical imaging lens assembly of Example 1.
[0083] The optical scanning imaging system in the first embodiment includes a first lens 101, a second lens 102, a third lens 103, a stop 104 and a fourth lens 105 arranged in sequence from the object side to the image side along the same optical axis, and the object side surface and the image side surface of each lens are aspherical surfaces;
[0084] Specifically, the surface shapes of each lens are as follows:
[0085] The first lens 101 has negative refractive power, and its object side surface is convex near the optical axis;
[0086] The second lens 102 has negative refractive power and its object side surface is convex;
[0087] The third lens 103 has positive refractive power and its image side surface is concave;
[0088] The fourth lens element 105 has positive refractive power, and its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis.
[0089] The optical imaging lens assembly also includes an infrared filter, which is placed between the fourth lens 105 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.
[0090] Please refer to Table 1-1 and Table 1-2 below for coordination.
[0091]
[0092]
[0093]
[0094]
[0095] 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.
[0096] Surfaces 0 to 12 represent surfaces from the object side to the image side, respectively, wherein surfaces 1-12 represent the object surface of the first lens 101, the image surface of the first lens 101, the object surface of the second lens 102, the image surface of the second lens 102, the object surface of the third lens 103, the image surface of the third lens 103, the aperture 104, the object surface of the fourth lens 105, the image surface of the fourth lens 105, the object surface of the infrared filter, the image surface of the infrared filter and the imaging surface.
[0097] Table 1-2 is the aspheric coefficient data in Example 1, where k represents the cone coefficient in the aspheric curve equation, and A4, A6, A8, A10, A12, A14 and A16 represent the 4th, 6th, 8th, 10th, 12th, 14th and 16th order aspheric coefficients of each surface.
[0098] Embodiment 2
[0099] See Reference Figures 4 to 6 , Figure 4 A schematic diagram of an optical scanning imaging system according to a second embodiment of the present utility model is shown. Figure 5 The field curvature and distortion curves of the optical scanning imaging system of the second embodiment of the present utility model are shown from left to right. Figure 6 Graph showing the axial aberration of the optical imaging lens assembly of the second embodiment.
[0100] The optical scanning imaging system in the second embodiment includes a first lens 201, a second lens 202, a third lens 203, an aperture 204 and a fourth lens 205 arranged in sequence from the object side to the image side along the same optical axis, and the object side surface and the image side surface of each lens are aspherical surfaces.
[0101] The surface shape of each lens is the same as that of the lens in the first embodiment.
[0102] Please refer to Table 2-1 and Table 2-2 below for coordination.
[0103]
[0104]
[0105]
[0106]
[0107] Embodiment 3
[0108] See Reference Figures 7 to 9 , Figure 7 A schematic diagram of an optical scanning imaging system according to a third embodiment of the present utility model is shown. Figure 8 The field curvature and distortion curves of the optical scanning imaging system of the third embodiment of the present utility model are shown from left to right. Fig. 9 Graph showing the axial aberration of the optical imaging lens assembly of the third embodiment.
[0109] The optical scanning imaging system in the third embodiment includes a first lens 301, a second lens 302, a third lens 303, an aperture 304 and a fourth lens 305 arranged in sequence from the object side to the image side along the same optical axis, and the object side surface and the image side surface of each lens are aspherical surfaces;
[0110] The surface shape of each lens is the same as that of the lens in the first embodiment.
[0111] Please refer to Table 3-1 and Table 3-2 below for coordination.
[0112]
[0113]
[0114]
[0115]
[0116] Embodiment 4
[0117] See Reference Figures 10 to 12 , Fig.10A schematic diagram of an optical scanning imaging system according to a fourth embodiment of the present utility model is shown. Fig.11 The field curvature and distortion curves of the optical scanning imaging system of the fourth embodiment of the utility model are shown from left to right. Fig.12 Graph showing the axial aberration of the optical imaging lens assembly of the fourth embodiment.
[0118] The optical scanning imaging system in the fourth embodiment includes a first lens 401, a second lens 402, a third lens 403, an aperture 404 and a fourth lens 405 which are arranged in sequence from the object side to the image side along the same optical axis, and the object side surface and the image side surface of each lens are aspherical surfaces;
[0119] The surface shape of each lens is the same as that of the lens in the first embodiment.
[0120] Please refer to Table 4-1 and Table 4-2 below for coordination.
[0121]
[0122]
[0123]
[0124]
[0125] 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 optical scanning imaging system, characterized in that: It includes a first lens, a second lens, a third lens, a stop and a fourth lens which are arranged in sequence from the object side to the image side along the same optical axis, and the object side surface and the image side surface of each lens are both aspherical surfaces; The first lens has negative refractive power and its object side surface is convex near the optical axis; The second lens has negative refractive power and its object side is convex; The third lens has positive refractive power and its image side surface is concave; The fourth lens has positive refractive power, its object side surface is convex near the optical axis, and its image side surface is convex near the optical axis; The optical scanning imaging system includes a system that satisfies the relationship: -0.111<f / R4<-0.091, 74.215<V1+V3<74.215; Among them, 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 Abbe number of the first lens, and V3 is the Abbe number of the third lens.
2. An optical scanning imaging system according to claim 1, characterized in that: The optical scanning imaging system also satisfies the following relationship: 0.135 <f / TTL<0.149; TTL is the total optical length of the optical scanning imaging system.
3. The optical scanning imaging system according to claim 1, characterized in that: The optical scanning imaging system also satisfies the following relationship: 0.814 <SAG12 / T12<0.959; SAG12 is the sag height of the image side surface of the first lens at the maximum effective radius, and T12 is the air space on the optical axis between the first lens and the second lens.
4. The optical scanning imaging system according to claim 1, characterized in that: The optical scanning imaging system also satisfies the following relationship: 0.149 <T34 / AAT<0.155; T34 is the air gap between the image side surface of the third lens and the object side surface of the fourth lens on the optical axis, and AAT is the sum of the air gaps between adjacent lenses from the first lens to the fourth lens.
5. The optical scanning imaging system according to claim 1, characterized in that: The optical scanning imaging system also satisfies the following relationship: -0.089 <f / (f1+f4)<-0.066; f1 is the focal length of the first lens, and f4 is the focal length of the fourth lens.
6. The optical scanning imaging system according to claim 1, characterized in that: The optical scanning imaging system also satisfies the following relationship: -0.089 <f / f123<-0.066; f123 is the combined focal length of the first lens, the second lens and the third lens.
7. The optical scanning imaging system according to claim 1, characterized in that: The optical scanning imaging system also satisfies the following relationship: 0.933 <f4 / CT4<0.946; f4 is the focal length of the fourth lens, and CT4 is the thickness of the fourth lens on the optical axis.