Optical imaging lens assembly and application thereof

Abstract

The application discloses an optical imaging lens and application thereof, and relates to the technical field of display imaging. It should be noted that the optical imaging lens provided by the application defines the working distance of the optical imaging lens and limits the numerical range, and defines Y1, Y2 and Y3 and limits the proportional relationship of Y1, Y2 and Y3, so that the optical imaging lens composed of multiple lenses can clearly image the curved image on the second side, thereby enabling the optical imaging lens to be quickly and accurately matched to the curved image during installation and adjustment. Therefore, the optical imaging lens provided by the application can not only realize high-quality and clear imaging of the curved image on the image side, but also is beneficial to reducing the assembly process difficulty of the entire optical imaging lens, and is also beneficial to realizing batch assembly production at low cost, thereby laying a good technical foundation for product processing quality control of products containing the optical imaging lens.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of display imaging technology, in particular to an optical imaging lens and application thereof. BACKGROUND

[0002] Display imaging technology is widely used in various industries. Scanning display imaging, as a new display technology, can be used in projection display, near-eye display and other application scenarios.

[0003] However, in the existing scanning display imaging system, there are high processing difficulty, high mass production cost and poor imaging quality, etc., which limits the market promotion and application of scanning display imaging technology, especially in the field of optical fiber scanning display technology. Since the image formed by optical fiber scanning is a curved surface, it is difficult to achieve clear imaging of the curved surface. SUMMARY

[0004] The purpose of the present application is to provide an optical imaging lens and application thereof to solve the problem of clear imaging of curved surface image.

[0005] The present application provides an optical imaging lens, which comprises a plurality of lenses arranged in order along an optical axis from a first side to a second side, and the second side of the optical imaging lens corresponds to a curved surface image.

[0006] The lens surface close to and opposite to the curved surface image is a concave surface, and the distance between the concave surface and the curved surface image on the optical axis is the working distance of the optical imaging lens, which is 0.2mm-1.5mm.

[0007] The lens with the concave surface has a first side surface and a second side surface from the first side to the second side, and the second side surface corresponds to the concave surface. When the optical imaging lens works, the light rays form intersection heights Y1, Y2 and Y3 with the first side surface, the second side surface and the curved surface image in order, which have maximum values. The Y1, Y2 and Y3 satisfy the following relationship: 1.5≤Y1 / Y2≤2.5; 1.2≤Y2 / Y3≤2.0.

[0008] Further, in the preferred embodiment of the present application, there must be a negative lens in the plurality of lenses, and the focal length F i of the negative lens satisfies the following relationship with the total focal length F 总 of the optical imaging lens: 0.2≤|F i / F 总 |≤1.5.

[0009] Further, in the preferred embodiments of the present application, the Y1, the Y2 and the Y3 have the following relationship: 1.6≤Y1 / Y2≤1.9; 1.3≤Y2 / Y3≤1.5.

[0010] Further, in the preferred embodiments of the present application, the total focal length is 2mm-3.5mm.

[0011] The total focal length and the working distance of the optical imaging lens have the following relationship: 2.95≤F 总 / F 工作距 ≤14.43, wherein the F 总 is the total focal length of the optical imaging lens, and the F 工作距 is the working distance of the optical imaging lens.

[0012] Further, in the preferred embodiments of the present application, the working distance is 0.2mm-1.1mm.

[0013] Further, in the preferred embodiments of the present application, the curved surface of the curved image has the same direction as the curved surface of the concave surface.

[0014] Further, in the preferred embodiments of the present application, the curved image is formed by the swing of the optical fiber carrying the optical signal.

[0015] Further, in the preferred embodiments of the present application, the projection of the curved image along the optical axis direction is a curved surface projection, the integral surface area on the curved image is a first integral surface area, the integral surface area corresponding to the first integral surface area on the curved surface projection is a second integral surface area, and the first integral surface area and the second integral surface area correspond to each other one by one.

[0016] The second integral surface area on the curved surface projection gradually decreases from the center to the periphery.

[0017] Further, in the preferred embodiments of the present application, a tangent plane passing through the center point of the curved image has a normal vector perpendicular to the tangent plane, the normal vector passes through the center point, the center point is the intersection O of the curved image and the tangent plane, any point P on the curved image does not pass through the intersection O, the projection point P' of the P point on the normal vector is corresponding to the P point, and the displacement D of the intersection O to the P' has the following relationship: 0<D<0.5mm.

[0018] The slope of the P point becomes smaller and smaller as the P point moves away from the normal vector.

[0019] The embodiments of the present application also propose an application of the optical imaging lens as described above, and the optical imaging lens is applied to the display field or the imaging field.

[0020] The technical solutions in the embodiments of the present application can achieve the following technical effects:

[0021] In the embodiments of the present application, by defining the working distance of the optical imaging lens group and limiting the numerical range, and by defining Y1, Y2 and Y3 and limiting the proportional relationship of Y1, Y2 and Y3, the optical imaging lens group composed of multiple lenses can clearly image the curved image on the second side, so that the optical imaging lens group can be quickly and accurately matched to the curved image during installation and adjustment. Therefore, the optical imaging lens group provided in the embodiments of the present application not only can realize high-quality and clear imaging of the curved image on the image side, but also is beneficial to reducing the assembly process difficulty of the entire optical imaging lens group, and is also beneficial to realizing batch assembly production at low cost, thereby laying a good technical foundation for product processing quality control of products containing the optical imaging lens group.

[0022] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the structures and / or processes specifically pointed out in the specification, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the accompanying drawings:

[0024] Figure 1a 、 1b is a structural schematic diagram of an illustrative scanning display system;

[0025] Figure 2 is a schematic diagram of the scanning output of the optical fiber scanner provided in the embodiments of the present application;

[0026] Figure 3a is a structural schematic diagram of the optical imaging lens group provided in the embodiments of the present application with respect to the concave surface, the curved image and the working distance;

[0027] Figure 3b is a structural schematic diagram of the optical imaging lens group provided in the embodiments of the present application with respect to the concave surface, the curved image and Y1, Y2 and Y3;

[0028] Figure 4 is a structural schematic diagram of the curved image corresponding to the optical imaging lens group provided in the embodiments of the present application;

[0029] Figure 5 is a structural schematic diagram of an optical imaging lens group provided in the embodiments of the present application;

[0030] Figure 6 is a MTF curve diagram of the optical imaging lens set in Embodiment One of the present application;

[0031] Figure 7 is a field curvature distortion curve diagram of the optical imaging lens set in Embodiment One of the present application;

[0032] Figure 8 is a sagittal chromatic aberration diagram of the optical imaging lens set in Embodiment One of the present application;

[0033] Figure 9 is a structural schematic diagram of the optical imaging lens set provided in Embodiment Two of the present application;

[0034] Figure 10 is a MTF curve diagram of the optical imaging lens set in Embodiment Two of the present application;

[0035] Figure 11 is a field curvature distortion curve diagram of the optical imaging lens set in Embodiment Two of the present application;

[0036] Figure 12 is a sagittal chromatic aberration diagram of the optical imaging lens set in Embodiment Two of the present application;

[0037] Figure 13 is a structural schematic diagram of the optical imaging lens set provided in Embodiment Three of the present application;

[0038] Figure 14 is a MTF curve diagram of the optical imaging lens set in Embodiment Three of the present application;

[0039] Figure 15 is a field curvature distortion curve diagram of the optical imaging lens set in Embodiment Three of the present application;

[0040] Figure 16 is a sagittal chromatic aberration diagram of the optical imaging lens set in Embodiment Three of the present application;

[0041] Figure 17 is a structural schematic diagram of the optical imaging lens set provided in Embodiment Four of the present application;

[0042] Figure 18 is a MTF curve diagram of the optical imaging lens set in Embodiment Four of the present application;

[0043] Figure 19 is a field curvature distortion curve diagram of the optical imaging lens set in Embodiment Four of the present application;

[0044] Figure 20 is a sagittal chromatic aberration diagram of the optical imaging lens set in Embodiment Four of the present application;

[0045] Figure 21 is a structural schematic diagram of the optical imaging lens set provided in Embodiment Five of the present application;

[0046] Figure 22 is a MTF curve diagram of the optical imaging lens set in embodiment five of the present application;

[0047] Figure 23 is a field curvature distortion curve diagram of the optical imaging lens set in embodiment five of the present application;

[0048] Figure 24 is a sagittal chromatic aberration diagram of the optical imaging lens set in embodiment five of the present application;

[0049] Figure 25 is a structural schematic diagram of the optical imaging lens set provided in embodiment six of the present application;

[0050] Figure 26 is a MTF curve diagram of the optical imaging lens set in embodiment six of the present application;

[0051] Figure 27 is a field curvature distortion curve diagram of the optical imaging lens set in embodiment six of the present application;

[0052] Figure 28 is a sagittal chromatic aberration diagram of the optical imaging lens set in embodiment six of the present application;

[0053] Figure 29 is a structural schematic diagram of the optical imaging lens set provided in embodiment seven of the present application;

[0054] Figure 30 is a MTF curve diagram of the optical imaging lens set in embodiment seven of the present application;

[0055] Figure 31 is a field curvature distortion curve diagram of the optical imaging lens set in embodiment seven of the present application;

[0056] Figure 32 is a sagittal chromatic aberration diagram of the optical imaging lens set in embodiment seven of the present application;

[0057] Figure 33 is a structural schematic diagram of the optical imaging lens set provided in embodiment eight of the present application;

[0058] Figure 34 is a MTF curve diagram of the optical imaging lens set in embodiment eight of the present application;

[0059] Figure 35 is a field curvature distortion curve diagram of the optical imaging lens set in embodiment eight of the present application;

[0060] Figure 36 is a sagittal chromatic aberration diagram of the optical imaging lens set in embodiment eight of the present application;

[0061] Figure 37 is a structural schematic diagram of the optical imaging lens set provided in embodiment nine of the present application;

[0062] Figure 38 is a MTF curve graph of the optical imaging lens set in Embodiment Nine of the present application;

[0063] Figure 39 is a field curvature distortion curve graph of the optical imaging lens set in Embodiment Nine of the present application;

[0064] Figure 40 is a sagittal chromatic aberration graph of the optical imaging lens set in Embodiment Nine of the present application;

[0065] Figure 41 is a structural schematic diagram of the optical imaging lens set provided in Embodiment Ten of the present application;

[0066] Figure 42 is a MTF curve graph of the optical imaging lens set in Embodiment Ten of the present application;

[0067] Figure 43 is a field curvature distortion curve graph of the optical imaging lens set in Embodiment Ten of the present application;

[0068] Figure 44 is a sagittal chromatic aberration graph of the optical imaging lens set in Embodiment Ten of the present application;

[0069] Figure 45 is a structural schematic diagram of the optical imaging lens set provided in Embodiment Eleven of the present application;

[0070] Figure 46 is a MTF curve graph of the optical imaging lens set in Embodiment Eleven of the present application;

[0071] Figure 47 is a field curvature distortion curve graph of the optical imaging lens set in Embodiment Eleven of the present application;

[0072] Figure 48 is a sagittal chromatic aberration graph of the optical imaging lens set in Embodiment Eleven of the present application.

[0073] Figure: 100-processor; 110-laser group; 120-fiber scanning module; 130-transmission optical fiber; 140-light source modulation circuit; 150-scanning driving circuit; 160-beam combining unit; 121-scanning actuator; 121a-slow axis; 121b-fast axis; 122-fiber cantilever; 123-lens group; 124-scanner package shell; 125-fixing member; 230-scanning curved surface; 240-imaging plane; 01-diaphragm; 02-scanning curved surface; 03-diaphragm; 04-scanning curved surface; 05-diaphragm; 06-scanning curved surface; 07-diaphragm; 08-scanning curved surface; 09-diaphragm; 10-scanning curved surface; 11-diaphragm; 12-scanning curved surface; 13-diaphragm; 14-scanning curved surface; 15-diaphragm; 16-scanning curved surface; 17-diaphragm; 18-scanning curved surface; 19-diaphragm; 20-scanning curved surface; 21-diaphragm; 22-scanning curved surface. DETAILED DESCRIPTION

[0074] The application will be described in further detail below with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not intended to limit the scope of the application. In addition, it should be noted that, for the sake of brevity, only portions of the drawings that are necessary for describing the application are shown.

[0075] First of all, it needs to be explained that, in order to make the person skilled in the art have a clearer and more profound understanding of the technical points and technical effects of the optical imaging lens provided by the present application, the applicant first illustrates the application scenarios of the optical imaging lens provided by the present application:

[0076] Illustrative scanning display system

[0077] For the current scanning display imaging, it can be realized by a micro-electro-mechanical system (MEMS) or a fiber scanning display (FSD) device. Among them, the FSD scheme is a new type of scanning display imaging method, which realizes the scanning output of the image through a fiber scanner. In order to enable the person skilled in the art to clearly understand the scheme of the present application, the brief principle of fiber scanning imaging and the corresponding system are described below.

[0078] As shown in Figure 1a , it is an illustrative scanning display system in the present application, which mainly includes:

[0079] The processor 100, the laser group 110, the fiber scanning module 120, the transmission fiber 130, the light source modulation circuit 140, the scanning driving circuit 150 and the beam combining unit 160. Among them,

[0080] The processor 100 can be a graphics processing unit (GPU), a central processing unit (CPU) or other chips or circuits with control function and image processing function, which is not specifically limited here.

[0081] When the system works, the processor 100 can control the light source modulation circuit 140 to modulate the laser group 110 according to the image data to be displayed. The laser group 110 includes a plurality of monochromatic lasers, which respectively emit light beams of different colors. From Figure 1aAs can be seen, the laser array 110 can specifically use red (R), green (G), and blue (B) lasers. The beams emitted by each laser in the laser array 110 are combined into a single laser beam by the beam combining unit 160 and coupled into the transmission optical fiber 130.

[0082] The processor 100 can also control the scanning drive circuit 150 to drive the fiber scanner in the fiber scanning module 120 to perform scanning, thereby scanning and outputting the beam transmitted in the transmission fiber 130.

[0083] A beam of light output from a fiber optic scanner acts on a specific pixel on the surface of a medium, forming a light spot at that pixel, thus achieving scanning of that pixel location. Driven by the fiber optic scanner, the output end of the transmission fiber 130 sweeps along a specific scanning trajectory, causing the beam to move to the corresponding pixel location. During the actual scanning process, the beam output from the transmission fiber 130 forms a light spot with corresponding image information (such as color, grayscale, or brightness) at each pixel location. Within one frame, the beam traverses each pixel location at a sufficiently high speed to complete the scanning of one frame of the image. Due to the "visual persistence" characteristic of human vision, the human eye cannot perceive the movement of the beam at each pixel location, but instead sees a complete image frame.

[0084] Continue to refer to Figure 1b The specific structure of the fiber optic scanning module 120 includes: a scanning actuator 121, a fiber optic cantilever 122, a mirror assembly 123, a scanner housing 124, and a fixing member 125. The scanning actuator 121 is fixed to the scanner housing 124 by the fixing member 125. The transmission fiber 130 extends from the front end of the scanning actuator 121 to form the fiber optic cantilever 122 (also called the scanning fiber). During operation, driven by the scanning drive signal, the slow axis 121a (also called the first actuation part) of the scanning actuator 121 moves along the vertical direction (this vertical direction is parallel to the...). Figure 1a , 1b The Y-axis in the reference coordinate system (in this application, the vertical direction can also be referred to as the first direction) vibrates, and its fast axis 121b (also referred to as the second actuator) vibrates along the horizontal direction (this horizontal direction is parallel to the reference coordinate system). Figure 1a , 1b The X-axis in the reference coordinate system (in this application, this horizontal direction can also be referred to as the second direction) vibrates, driven by the scanning actuator 121. The front end of the fiber optic cantilever 122 performs a two-dimensional sweep along a preset trajectory and emits a light beam. The emitted light beam can then pass through the mirror assembly 123 to achieve scanning imaging. Generally, the structure composed of the scanning actuator 121 and the fiber optic cantilever 122 can be called a fiber optic scanner.

[0085] like Figure 2As shown in this embodiment, the motion trajectory of the optical fiber output end forms a scanning surface 230 through the movement of the fast and slow axes. After passing through the corresponding lens group 123, it is converted into an imaging plane 240. When applied to near-eye display devices such as augmented reality (AR) devices, the imaging plane 240 is coupled into the waveguide as the entrance pupil of the waveguide to form an image for human viewing.

[0086] Furthermore, for ease of description and to enable those skilled in the art to readily understand the solution of this application, it should be noted that the optical imaging lens assembly in this application (such as...) Figure 2 The lens group 123 shown serves as an eyepiece. Through the action of this optical imaging lens group, the scanning surface 230 can be converted into an imaging plane 240 (in practical applications, the direction of light transmission is from the scanning surface 230 to the imaging plane 240). Therefore, the side of the optical imaging lens group corresponding to the imaging plane 240 is referred to as the first side, and the side of the optical imaging lens group corresponding to the scanning surface 230 is referred to as the second side. In the following description, "first side" and "second side" will be used as references to describe the embodiment of the optical imaging lens group. Furthermore, in the description of the subsequent embodiments, such as for a certain lens in the optical imaging lens group, "the first side surface of the Xth lens" refers to the surface of the Xth lens facing the first side.

[0087] It should be further noted that in the field of projection, the image corresponding to the first side is a planar image, and the corresponding planar image carrier can be such as a projection screen, a screen, or a wall. The image corresponding to the second side is a curved image, that is, an arc-shaped scanning surface scanned by a fiber optic scanner or emitted by other image sources. In the application scenario of the camera field, the optical path is reversed in the field of projection. The first side generally corresponds to the object side that collects image information, and the second side generally corresponds to the image side that is captured and formed.

[0088] Optical imaging lens

[0089] Please refer to Figure 1- Figure 3bThe optical imaging lens group in the embodiment of the present application comprises a plurality of lenses, which are sequentially arranged on the same optical axis from the first side to the second side, and the second side of the optical imaging lens group corresponds to a curved image; the surface of the lens close to and opposite to the curved image is a concave surface, and the distance between the concave surface and the curved image on the optical axis is the working distance of the optical imaging lens group, and the working distance is 0.2mm-1.5mm; the lens with the concave surface sequentially has a first side surface and a second side surface from the first side to the second side, and the second side surface corresponds to the concave surface; when the optical imaging lens group works, the light rays sequentially form the maximum intersection heights Y1, Y2 and Y3 with the first side surface, the second side surface and the curved image, wherein the Y1, the Y2 and the Y3 have the following relationship: 1.5≤Y1 / Y2≤2.5; 1.2≤Y2 / Y3≤2.0. It should be noted that in the embodiment of the present application, by defining and limiting the numerical range of the working distance of the optical imaging lens group, and by defining Y1, Y2 and Y3 and limiting the proportional relationship of Y1, Y2 and Y3, the optical imaging lens group composed of a plurality of lenses can clearly image the curved image on the second side, so that the optical imaging lens group can quickly and accurately match the curved image during installation and adjustment. Therefore, the optical imaging lens group provided in the embodiment of the present application not only can realize high-quality and clear imaging of the curved image on the image side, but also is beneficial to reducing the assembly process difficulty of the entire optical imaging lens group, and is also beneficial to realizing batch assembly production at low cost, thereby laying a good technical foundation for product processing and quality control of products containing the optical imaging lens group. It should be emphasized that the numerical limitation of the working distance is preferably 0.2mm-1.1mm.

[0090] It should also be noted that by limiting the proportions of Y1, Y2 and Y3, some physical or / and geometric characteristics of the first side surface, the second side surface and the curved image can be correspondingly limited, such as their respective effective apertures (under the above-mentioned proportional limitation of Y1, Y2 and Y3 in the present application, the effective aperture of the first side surface ranges from 2.14mm to 4.34mm, the effective aperture of the second side surface ranges from 0.8mm to 2.75mm, and the image height of the curved image ranges from 0.57mm to 1.97mm). Of course, in other embodiments of the present application, the effective aperture is not the only characteristic, and other related characteristics can also be included.

[0091] In order to further optimize the proportional relationship of the intersection heights Y1, Y2 and Y3 to achieve better technical effects, in the embodiment of the present application, preferably, Y1, Y2 and Y3 have the following relationship: 1.6≤Y1 / Y2≤1.9; 1.3≤Y2 / Y3≤1.5.

[0092] Furthermore, in one possible implementation, one of the plurality of lenses must be a negative lens with a focal length F. i The total focal length F of the optical imaging lens group 总 The following relationship exists: 0.2 ≤ |F i / F 总 |≤1.5. It should be noted that by limiting the absolute value of the ratio of the focal length of a negative lens to the total focal length, not only is the focal length distribution ratio of other lenses balanced, but it also plays an important role in correcting aberrations of the entire optical imaging lens group, thus further enhancing the image quality.

[0093] Furthermore, in one possible implementation, the total focal length of the optical imaging lens group provided in this application is 2mm-3.5mm. It should be noted that by limiting the total focal length of the optical imaging lens group, it can be well adapted to the working distance, thereby achieving correction of various aberrations and ultimately achieving high-quality, clear imaging of curved images.

[0094] More specifically, in one possible implementation, the total focal length and the working distance of the optical imaging lens group have the following relationship: 2.95 ≤ F 总 / F 工作距 ≤14.43, where F 总 The total focal length of the optical imaging lens group, the F 工作距 The working distance of the optical imaging lens group is described above. It should be noted that, in this embodiment, by quantifying the ratio between the total focal length and the working distance, and configuring them within a reasonable range, the data on the adaptation relationship between the total focal length and the working distance is digitized. This provides strong scientific support for the design and manufacturing of the optical imaging lens group, thereby further enhancing both the imaging quality and mass production control of the optical imaging lens group.

[0095] Furthermore, in one possible implementation, please refer to the reference... Figure 3a and Figure 3b The curved surface of the image and the concave surface have the same orientation. It should be noted that by limiting the curved surface of the image and the concave surface to the same direction, the lens closest to the image can be well adapted to the image, which is beneficial for receiving light from a wide angle, thus allowing for a more comprehensive and sufficient capture of information from the image.

[0096] Further, in a possible implementation, the curved image is formed by swinging of the optical fiber carrying the light signal, such as the curved image formed by swinging of the optical fiber on the optical fiber scanner as described above. Of course, it should be noted that in other embodiments of the present application, the curved image is not limited to the curved image formed as described in the present embodiment, but can also be a curved image formed in other ways, such as a curved image formed by moving a continuous output light source or a curved image formed by a self-luminous source.

[0097] Further optionally, in a possible implementation, a projection of the curved image along the optical axis direction is a curved surface projection, an integral surface area on the curved image is a first integral surface area, a corresponding integral surface area of the first integral surface area on the curved surface projection is a second integral surface area, and the first integral surface area and the second integral surface area correspond to each other one by one. It should be noted that the second integral surface area on the curved surface projection gradually decreases from the center to the periphery.

[0098] Further optionally, in a possible implementation, please refer to Figure 4 A tangent plane passing through the center point of the curved image has a normal vector perpendicular to the tangent plane, the normal vector passes through the center point, the center point is an intersection point O of the curved image and the tangent plane, any point P on the curved image other than the intersection point O has a projection point P' corresponding to the P point on the normal vector, and a displacement D of the intersection point O to the P' point satisfies the following relationship: 0<D<0.5mm. It should be noted that the slope passing through the P point becomes smaller and smaller as the P point moves away from the normal vector.

[0099] Further, in a possible implementation, the connection between the plurality of lenses can be interval connection or can be bonded together by adhesion, which will be determined according to the actual application needs, and is not limited here. It should be noted that in the embodiments of the present application, the number of the plurality of lenses is preferably 6, 7, 8, and 9; it should be emphasized that in other embodiments of the present application, the number of the plurality of lenses is not limited, which can be 3, 4, 5, 10, 11, etc.

[0100] Further optionally, in a possible implementation, the second side surface is a concave surface, which means that the second side surface forms a concave shape towards the second side direction of the optical imaging lens group.

[0101] Furthermore, in some embodiments, the surface of the lens is not entirely concave or convex. The surface of the lens may be a composite curved surface, or the near-optical axis portion may be curved while the edge portion is not curved. In particular, optionally, when the lens surface is convex and the position of the convex surface is not defined, it means that the convex surface can be located near the optical axis of the lens surface. Similarly, when the lens surface is concave and the position of the concave surface is not defined, it means that the concave surface can be located near the optical axis of the lens surface.

[0102] Further optionally, in one possible implementation, the first and second side surfaces of some of the multiple lenses are configured as aspherical surface structures. It should be noted that by limiting the mirror structure to an aspherical surface structure, more control variables can be obtained to reduce aberrations and reasonably reduce the number of lenses. Therefore, in addition to improving image display quality, it also contributes to the miniaturization or micro-miniaturization of optical imaging lens groups. Furthermore, the fact that the first and / or second side surfaces of a lens are aspherical surface structures can be understood as meaning that the entire or a portion of the optically effective area of ​​the lens surface is aspherical.

[0103] Additionally, it should be noted that the optical imaging lens assembly disclosed in this application may optionally include at least one aperture stop, which may be located before the first lens (first side), between each lens, or after the last lens (second side). The aperture stop may be of the type such as an aperture stop or a field stop, which can be used to reduce stray light and help improve image display quality.

[0104] This application also provides an application of the optical imaging lens group described above, specifically, applying the optical imaging lens group to the display field or the imaging field. It should be noted that the display field includes the display imaging field; furthermore, in other embodiments of this application, the application of the optical imaging lens group is not limited to the display field or imaging field provided in this application embodiment, but can also be other related fields and corresponding related technology products that can utilize the technical principles and features of the optical imaging lens group of this application.

[0105] Example One

[0106] Figure 5 This is a schematic diagram of an optical imaging lens assembly provided in an embodiment of the present invention. The optical imaging lens assembly includes a first side (i.e., Figure 5 From the side where aperture 01 is located to the second side (that is, Figure 5 A first cemented lens, a second lens, a third cemented lens, a fourth lens, a fifth cemented lens, a sixth lens, and a seventh lens are sequentially arranged along the optical axis on the side where the scanning surface 02 (corresponding to the image plane of the curved image) is located. It should be noted that the total focal length F of the optical imaging lens assembly provided in this embodiment of the invention... 总 It is 2.579mm, and the working distance F工作距 It is 0.47mm, F 总 / F 工作距 The value is 5.49, Y1 / Y2 is 1.647, Y2 / Y3 is 1.293, |F1 / F 总 | is 0.82.

[0107] More specifically, in this embodiment, the focal length and lens type of each lens in the optical imaging lens group are shown in Table 1 below:

[0108] Table 1. Focal length parameters and lens types of each lens in the optical imaging lens group.

[0109]

[0110] Furthermore, the optical imaging lens assembly provided in Embodiment 1 of the present invention has a half field of view of 14 degrees. The surface shape, radius of curvature, thickness parameters, refractive index, and dispersion coefficient of each lens used to image the scanning surface O2 are shown in Table 2:

[0111] Table 2 Structural parameters of the optical imaging lens assembly in Example 1

[0112]

[0113]

[0114] It should be noted that Table 2 contains detailed structural data of the optical imaging lens group in Embodiment 1. The units for radius of curvature, thickness and focal length are all millimeters, and surfaces 0-19 sequentially represent the surfaces from the first side to the second side; an optical surface with an "infinite" radius of curvature in the imaging plane refers to a plane.

[0115] Furthermore, in the optical imaging lens assembly of this embodiment, the aspherical coefficients corresponding to the lens surfaces with aspherical shapes are shown in Table 3 below:

[0116] Table 3. Aspheric coefficient data for lens surfaces with aspherical shapes in Example 1.

[0117] Surface Number 10 11 15 16 K -1.36E+00 -9.05E-01 -6.87E-01 -3.41E+00 A4 3.66E-03 2.87E-02 1.34E-02 -3.14E-02 A6 -7.66E-03 -6.54E-03 -6.53E-03 2.75E-02 A8 6.02E-03 5.53E-03 1.54E-03 -1.57E-02 A10 -2.46E-02 -4.00E-03 5.51E-04 2.18E-04 A12 3.44E-02 1.66E-03 -6.39E-04 3.52E-03 A14 -1.93E-02 -3.50E-04 2.02E-04 -1.42E-03 A16 3.93E-03 2.97E-05 -2.31E-05 1.74E-04

[0118] Table 3 shows the aspheric coefficient data in Example 1, where k is the conical coefficient in the aspheric curve equation, and A4 to A16 represent the 4th to 16th order aspheric coefficients of each surface.

[0119] Furthermore, tests showed that when the image light corresponding to the scanning surface is projected using the aforementioned optical imaging lens group, its optical transfer function curve is as follows: Figure 6 As shown, the field distortion curve is as follows: Figure 7 As shown, the vertical axis color difference curve is as follows: Figure 8As shown; among them, the Modulation Transfer Function (MTF) curve represents the overall resolution level of an optical system, the Field Curve Distortion curve represents the F-Tan (theta) distortion magnitude (percentage) under different field angles, and the Vertical Chromatic Aberration curve represents the magnitude of chromatic aberration in the vertical axis direction.

[0120] Depend on Figures 6-8 Observations show that the optical imaging lens group in Example 1 has good imaging resolution, small optical system distortion and chromatic aberration across the entire field of view. Therefore, the optical imaging lens group can clearly image the scanned curved surface image and has good imaging effect.

[0121] Of course, in practical applications, the optical imaging lens assembly may also include a photosensitive element, a housing, etc. The photosensitive element can be set on the second side of the optical imaging lens assembly, and the optical imaging lens assembly can be installed in the housing. This allows the curved image formed by the image source (such as a fiber optic scanner) to be imaged onto a plane, achieving clear imaging.

[0122] Example Two

[0123] Figure 9 This is a schematic diagram of an optical imaging lens assembly provided in an embodiment of the present invention. The optical imaging lens assembly includes a first side (i.e., Figure 9 From the side where aperture 03 is located (i.e., the second side) to the third side (i.e., Figure 9 The first cemented lens, second lens, third cemented lens, fourth lens, fifth lens, sixth lens, seventh lens, and eighth lens are sequentially arranged along the common optical axis on the side where the scanning curved surface 04 (corresponding to the image plane of the curved image) is located. It should be noted that the total focal length F of the optical imaging lens group provided in this embodiment of the invention... 总 The thickness is 3.03mm, and the working distance is F. 工作距 It is 0.211mm, F 总 / F 工作距 The value is 14.43, Y1 / Y2 is 1.42, Y2 / Y3 is 1.23, |F4 / F 总 | is 0.37.

[0124] More specifically, in this embodiment, the focal length parameters and lens types of each lens in the optical imaging lens group are shown in Table 4 below:

[0125] Table 4. Focal length parameters and lens types of each lens in the optical imaging lens group.

[0126]

[0127] Further, the optical imaging lens provided by the second embodiment of the present application has a half field angle of 14 degrees, and the parameters of the surface shape, the curvature radius, the thickness, the refractive index and the dispersion coefficient of each lens in imaging the scanning surface 04 are shown in Table 5:

[0128] Table 5 Structure parameters of the optical imaging lens in the second embodiment

[0129]

[0130]

[0131] It should be noted that Table 5 is the detailed structure data of the optical imaging lens in the second embodiment, wherein the units of the curvature radius, the thickness and the focal length are millimeters, and the surfaces 0-20 represent the surfaces from the first side to the second side in sequence; the optical surface with an infinite curvature radius in the imaging plane means a plane.

[0132] Further, the aspheric surface coefficients of the lens surfaces with aspheric surface shape in the optical imaging lens of the present embodiment are shown in Table 6:

[0133] Table 6 Aspheric surface coefficient data of the lens surfaces with aspheric surface shape in the second embodiment

[0134]

[0135]

[0136] Table 6 is the aspheric surface coefficient data in the second embodiment, wherein k is the conic coefficient in the aspheric curve equation, and A4-A16 represent the 4th-16th order aspheric coefficients of each surface.

[0137] Further, when the image light corresponding to the scanning surface is projected by using the optical imaging lens, the Modulation Transfer Function (MTF) curve is shown in Figure 10 , the field curvature distortion curve is shown in Figure 11 , and the axial chromatic aberration curve is shown in Figure 12 ; wherein the Modulation Transfer Function (MTF) curve represents the comprehensive resolution level of an optical system, the field curvature distortion curve represents the F-Tan(theta) distortion value (percentage) under different field angles, and the axial chromatic aberration curve represents the size of the axial chromatic aberration.

[0138] It can be observed from Figures 10-12 that the optical imaging lens in the second embodiment has good imaging resolution in the full field of view, small optical system distortion and small chromatic aberration, so that the optical imaging lens can clearly image the scanning surface image, and has good imaging effect.

[0139] Of course, in practical applications, the optical imaging lens group can also include a photosensitive element and a shell, the photosensitive element can be arranged on the second side of the optical imaging lens group, and the optical imaging lens group can be installed in the shell, that is, the curved image formed by scanning the image source (such as a fiber scanner) can be imaged on a plane to realize clear imaging.

[0140] Example Three

[0141] Figure 13 A structural schematic diagram of an optical imaging lens group provided by an embodiment of the present application. The optical imaging lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens arranged in sequence on the same optical axis from a first side (that is, a side where the diaphragm 05 in the above table is located) to a second side (that is, a side where the scanning curved surface 06 in the above table is located, which corresponds to the image plane of the curved image). Figure 13 Figure 13 Need to be explained is that the total focal length F of the optical imaging lens group provided by the embodiment of the present application is 3.19 mm, the working distance F of the optical imaging lens group is 1.08 mm, F / F is 2.95, Y1 / Y2 is 1.766, Y2 / Y3 is 1.923, and |F3 / F| is 0.54. 总 工作距 总 工作距 总

[0142] Further specifically, in the embodiment, the focal length parameters and the lens types of the lenses in the optical imaging lens group are shown in the following table 7:

[0143] Table 7: Focal length parameters and lens types of lenses in the optical imaging lens group

[0144]

[0145] Further, the optical imaging lens group provided by the third embodiment of the present application has a half field angle of 9 degrees, and the parameters of the surface shape, the curvature radius, the thickness parameter, the refractive index, and the dispersion coefficient of each lens for imaging the scanning curved surface 06 are shown in the following table 8:

[0146] Table 8: Structural parameters of the optical imaging lens group in the third embodiment

[0147] Surface Number Lens Number Surface Shape Radius of Curvature Thickness / Spacing Material Refractive Index Dispersion Coefficient 0 Imaging Plane Plane Infinite Infinite 1 Stop 05 Infinite 1 2 1 Spherical 3.01 1.12 1.91 35.3 3 -14.36 0.52 4 2 Spherical -4.96 0.44 1.7 30.1 5 2.44 0.67 6 3 Spherical -1.08 0.74 1.92 20.9 7 -8.05 0.18 8 4 Spherical -4.22 1.59 1.77 49.6 9 -2.35 0.10 10 5 Spherical -13.73 1.17 1.76 52.3 11 -4.09 0.10 12 6 Spherical 7.59 0.44 1.92 18.9 13 3.64 0.99 14 7 Spherical 12.37 0.99 1.7 56.2 15 -11.15 0.06 16 8 Spherical 2.84 1.31 1.75 52.3 17 3.72 0.06 18 9 Spherical 2.23 1.47 1.95 32.3 19 1.48 1.08 20 Scanning Surface 06 Spherical 1.7

[0148] Need to be explained is that table 8 is the detailed structural data of the optical imaging lens group in the third embodiment, wherein the units of the curvature radius, the thickness, and the focal length are all millimeters, and surfaces 0-20 represent the surfaces in sequence from the first side to the second side; the optical surface with an infinite curvature radius in the imaging plane means a plane.​​​​​​

[0149] Furthermore, tests showed that when the image light corresponding to the scanning surface is projected using the aforementioned optical imaging lens group, its optical transfer function curve is as follows: Figure 14 As shown, the field distortion curve is as follows: Figure 15 As shown, the vertical axis color difference curve is as follows: Figure 16 As shown; among them, the Modulation Transfer Function (MTF) curve represents the overall resolution level of an optical system, the Field Curve Distortion curve represents the F-Tan (theta) distortion magnitude (percentage) under different field angles, and the Vertical Chromatic Aberration curve represents the magnitude of chromatic aberration in the vertical axis direction.

[0150] Depend on Figures 14-16 Observations show that the optical imaging lens group of Example 3 has good imaging resolution and small optical system distortion and chromatic aberration across the entire field of view. Therefore, the optical imaging lens group can clearly image the scanned curved surface image and has good imaging effect.

[0151] Of course, in practical applications, the optical imaging lens assembly may also include a photosensitive element, a housing, etc. The photosensitive element can be set on the second side of the optical imaging lens assembly, and the optical imaging lens assembly can be installed in the housing. This allows the curved image formed by the image source (such as a fiber optic scanner) to be imaged onto a plane, achieving clear imaging.

[0152] Example Four

[0153] Figure 17 This is a schematic diagram of an optical imaging lens assembly provided in an embodiment of the present invention. The optical imaging lens assembly includes a first side (i.e., Figure 17 From the side where aperture 07 is located (to the second side, that is, Figure 17 The first, second, third, fourth, fifth, sixth, seventh, and eighth lenses are sequentially arranged along the optical axis on the side where the scanning surface 08 (corresponding to the image plane of the curved image) is located. It should be noted that the total focal length F of the optical imaging lens group provided in this embodiment of the invention... 总 The thickness is 2mm, and the working distance is F. 工作距 It is 0.249mm, F 总 / F 工作距 =8.03, Y1 / Y2 is 3, Y2 / Y3 is 1.34, |F8 / F 总 | is 1.4.

[0154] More specifically, in this embodiment, the focal length parameters and lens types of each lens in the optical imaging lens group are shown in Table 9 below:

[0155] Table 9: Focal length parameters and lens types of each lens in the optical imaging lens group

[0156]

[0157] Further, the optical imaging lens group provided by the fourth embodiment of the present application has a half field angle of 9 degrees, and the parameters of the surface shape, the curvature radius, the thickness parameter, the refractive index and the dispersion coefficient of each lens for imaging the scanning surface 08 are shown in Table 10:

[0158] Table 10: Structure parameters of the optical imaging lens group in the fourth embodiment

[0159] Surface Number Lens Number Surface Shape Radius of Curvature Thickness / Spacing Material Refractive Index Dispersion Coefficient 0 Imaging Plane Plane Infinite Infinite 1 Stop 07 Infinite 1 2 1 Spherical 8.53 0.69 1.834 37.2 3 -37.85 0.10 4 2 Spherical 2.07 0.84 1.82 18.8 5 1.48 0.93 6 3 Spherical -1.13 1.40 1.8 46.7 7 -1.88 0.10 8 4 Spherical -21.47 0.40 1.92 18.8 9 4.06 0.20 10 5 Spherical 5.57 1.37 1.5 81.6 11 -3.17 0.10 12 6 Spherical 7.02 0.97 1.5 81.6 13 -13.30 0.10 14 7 Spherical 2.43 1.28 1.5 81.6 15 70965.72 0.10 16 8 Spherical 1.73 1.40 2 25.4 17 0.64 0.25 18 Scanning Surface 08 Spherical 2.00

[0160] It should be noted that Table 10 is the detailed structure data of the optical imaging lens group in the fourth embodiment, wherein the units of the curvature radius, the thickness and the focal length are millimeters, and the surfaces 0-18 represent the surfaces from the first side to the second side in order; the optical surface with a curvature radius of "infinity" in the imaging plane means a plane.

[0161] Further, it is tested that when the image light corresponding to the scanning surface is projected by using the above optical imaging lens group, the modulation transfer function (MTF) curve is as shown in Figure 18 , the field curvature distortion curve is as shown in Figure 19 , and the axial chromatic aberration curve is as shown in Figure 20 ; wherein the modulation transfer function (MTF) curve represents the comprehensive resolution level of an optical system, the field curvature distortion curve represents the F-Tan(theta) distortion size value (percentage) under different field angles, and the axial chromatic aberration curve represents the size of the chromatic aberration in the vertical axial direction.

[0162] It can be observed from Figures 18-20 that the imaging resolution of the optical imaging lens group in the fourth embodiment is good in the full field of view range, the optical system distortion and the chromatic aberration are small, so the optical imaging lens group can clearly image the scanning surface image, and all have good imaging effects.

[0163] Of course, in actual applications, the optical imaging lens group can also include a photosensitive element and a shell, the photosensitive element can be arranged on the second side of the optical imaging lens group, and the optical imaging lens group can be installed in the shell, so that the curved surface image scanned by the image source (such as a fiber scanner) can be imaged on a plane to achieve clear imaging.

[0164] Example Five

[0165] Figure 21 A structure diagram of an optical imaging lens group provided by the present application is shown in FIG. 1. The optical imaging lens group includes a first side (i.e.,Figure 21 From the side where aperture 09 is located (to the second side, that is, Figure 21 The first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, and eighth lens are sequentially arranged along the optical axis on the same side as the scanning curved surface 10 (corresponding to the image plane of the curved image). It should be noted that the total focal length F of the optical imaging lens group provided in this embodiment of the invention... 总 The thickness is 3.19mm, and the working distance is F. 工作距 It is 0.423mm, F 总 / F 工作距 The value is 7.54, Y1 / Y2 is 1.94, Y2 / Y3 is 1.17, |F3 / F 总 | is 0.4.

[0166] More specifically, in this embodiment, the focal length parameters and lens types of each lens in the optical imaging lens group are shown in Table 11 below:

[0167] Table 11 Focal length parameters and lens types of each lens in the optical imaging lens group

[0168]

[0169]

[0170] Furthermore, the optical imaging lens assembly provided in Embodiment 5 of the present invention has a half field of view of 9 degrees. The parameters of the surface shape, radius of curvature, thickness, refractive index, and dispersion coefficient of each lens used to image the scanning surface 10 are shown in Table 12:

[0171] Table 12 Structural parameters of the optical imaging lens assembly in Example 5

[0172] Surface Number Lens Number Surface Shape Radius of Curvature Thickness / Spacing Material Refractive Index Dispersion Coefficient 0 Imaging Plane Plane Infinite Infinite 1 Stop 09 Infinite 1 2 1 Spherical 2.51 1.36 1.95 32.3 3 -72.73 0.51 4 2 Spherical -4.31 0.43 1.92 18.9 5 2.68 0.47 6 3 Spherical -1.26 1.11 1.92 18.9 7 53.73 0.35 8 4 Spherical -7.42 1.56 1.91 35.3 9 -2.38 0.10 10 5 Spherical 5.64 1.23 1.75 52.3 11 -9.07 0.24 12 6 Spherical -4.12 0.58 1.92 18.9 13 -15.95 0.11 14 7 Spherical 2.37 1.30 1.8 42.3 15 5.30 0.10 16 8 Spherical 2.37 1.24 1.95 17.9 17 1.28 0.42 18 Scanning Surface 10 Spherical 2.0

[0173] It should be noted that Table 12 contains detailed structural data of the optical imaging lens group in Embodiment 5. The units for radius of curvature, thickness and focal length are all millimeters, and surfaces 0-18 sequentially represent the surfaces from the first side to the second side; an optical surface with an "infinite" radius of curvature in the imaging plane refers to a plane.

[0174] Furthermore, tests showed that when the image light corresponding to the scanning surface is projected using the aforementioned optical imaging lens group, its optical transfer function curve is as follows: Figure 22 As shown, the field distortion curve is as follows: Figure 23 As shown, the vertical axis color difference curve is as follows: Figure 24As shown; among them, the Modulation Transfer Function (MTF) curve represents the overall resolution level of an optical system, the Field Curve Distortion curve represents the F-Tan (theta) distortion magnitude (percentage) under different field angles, and the Vertical Chromatic Aberration curve represents the magnitude of chromatic aberration in the vertical axis direction.

[0175] Depend on Figures 22-24 Observations show that the optical imaging lens group of Example 5 has good imaging resolution, small optical system distortion and chromatic aberration across the entire field of view. Therefore, the optical imaging lens group can clearly image the scanned curved surface image and has good imaging effect.

[0176] Of course, in practical applications, the optical imaging lens assembly may also include a photosensitive element, a housing, etc. The photosensitive element can be set on the second side of the optical imaging lens assembly, and the optical imaging lens assembly can be installed in the housing. This allows the curved image formed by the image source (such as a fiber optic scanner) to be imaged onto a plane, achieving clear imaging.

[0177] Example Six

[0178] Figure 25 This is a schematic diagram of an optical imaging lens assembly provided in an embodiment of the present invention. The optical imaging lens assembly includes a first side (i.e., Figure 25 From the side where aperture 11 is located to the second side (that is, Figure 25 The first lens, second lens, third lens, fourth cemented lens, fifth lens, sixth lens, seventh lens, eighth lens, and ninth lens are sequentially arranged along the optical axis on the same side as the scanning curved surface 12 (corresponding to the image plane of the curved image). It should be noted that the total focal length F of the optical imaging lens group provided in this embodiment of the invention... 总 It is 3.46mm, and the working distance F 工作距 It is 0.3mm, F 总 / F 工作距 The value is 11.53, Y1 / Y2 is 1.29, Y2 / Y3 is 1.38, |F6 / F 总 | is 0.28.

[0179] More specifically, in this embodiment, the focal length parameters and lens types of each lens in the optical imaging lens group are shown in Table 13 below:

[0180] Table 13 Focal length parameters and lens types of each lens in the optical imaging lens group

[0181]

[0182]

[0183] Further, the optical imaging lens provided by the sixth embodiment of the present application has a half field angle of 16 degrees, and the parameters of the surface shape, the radius of curvature, the thickness, the refractive index and the dispersion coefficient of each lens for imaging the scanning surface 12 are shown in Table 14:

[0184] Table 14 Structure parameters of the optical imaging lens in the sixth embodiment

[0185] Surface Number Lens Number Surface Shape Radius of Curvature Thickness / Spacing Material Refractive Index Dispersion Coefficient 0 Imaging Plane Plane Infinite Infinite 1 Stop 11 Infinite 1 2 1 Spherical -4.05 0.40 1.92 18.9 3 9.94 0.46 4 2 Spherical -3.56 1.34 1.65 59.1 5 -2.90 0.14 6 3 Spherical 5.59 2.00 1.9 19.7 7 -27.44 2.00 8 4 Spherical 3.73 1.63 1.76 52.3 9 5 Spherical -2.64 0.42 1.82 21.1 10 4.24 1.48 11 6 Aspherical -0.60 0.42 1.63 22.5 12 -27.63 0.08 13 7 Spherical 12.29 0.99 1.92 18.9 14 -12.34 0.20 15 8 Aspherical 2.52 1.88 1.54 55.9 16 -1.57 0.15 17 9 Aspherical 2.62 1.74 1.75 52.6 18 0.96 0.20 19 10 Spherical 2.42 0.84 2 25.4 20 2.720 0.30 21 Scanning Surface 12 Spherical 1.6

[0186] It should be noted that Table 14 is the detailed structure data of the optical imaging lens in the sixth embodiment, wherein the units of the radius of curvature, the thickness and the focal length are millimeters, and the surfaces 0-21 represent the surfaces from the first side to the second side in sequence; the optical surface with the radius of curvature of "infinity" in the imaging plane means a plane.

[0187] Further, the aspheric surface coefficients of the lens surfaces with aspheric surface shape in each lens of the optical imaging lens of the present embodiment are shown in Table 15:

[0188] Table 15 Aspheric surface coefficient data of the lens surfaces with aspheric surface shape in the sixth embodiment

[0189]

[0190]

[0191] Table 15 is the aspheric surface coefficient data in the sixth embodiment, wherein k is the conic coefficient in the aspheric curve equation, and A4 to A16 represent the 4th to 16th order aspheric coefficients of each surface.

[0192] Further, when the image light corresponding to the scanning surface is projected by using the optical imaging lens, the Modulation Transfer Function (MTF) curve is as shown in Figure 26 , the field curvature distortion curve is as shown in Figure 27 , and the axial chromatic aberration curve is as shown in Figure 28 ; wherein the Modulation Transfer Function (MTF) curve represents the comprehensive resolution level of an optical system, the field curvature distortion curve represents the F-Tan(theta) distortion size value (percentage) under different field angles, and the axial chromatic aberration curve represents the size of the axial chromatic aberration.

[0193] It can be observed from Figures 26-28 that the optical imaging lens in the sixth embodiment has good imaging resolution in the full field of view, small optical system distortion and small chromatic aberration, so that the optical imaging lens can clearly image the scanning surface image, and has good imaging effect.

[0194] Of course, in practical applications, the optical imaging lens group can also include a photosensitive element and a shell, the photosensitive element can be arranged on the second side of the optical imaging lens group, and the optical imaging lens group can be installed in the shell, that is, the curved image scanned by the image source (such as a fiber scanner) can be imaged on a plane to realize clear imaging.

[0195] Example Seven

[0196] Figure 29 A structural schematic diagram of an optical imaging lens group provided by an embodiment of the present application is shown in FIG. 1. The optical imaging lens group includes 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 on the same optical axis from a first side (that is, a side on which the diaphragm 13 in FIG. 1 is located) to a second side (that is, a side on which the scanning curved surface 14 in FIG. 1 is located, which corresponds to the image plane of the curved image). Figure 29 Figure 29 It should be noted that the total focal length F of the optical imaging lens group provided by the embodiment of the present application is 3 mm, the working distance F of the optical imaging lens group is 0.33 mm, F / F is 9.09, Y1 / Y2 is 2.47, Y2 / Y3 is 1.2, and |F4 / F| is 0.76. 总 工作距 总 工作距 总

[0197] Further specifically, in the embodiment, the focal length parameters and lens types of the lenses in the optical imaging lens group are shown in Table 16:

[0198] Table 16: Focal length parameters and lens types of lenses in the optical imaging lens group

[0199]

[0200] Further, the optical imaging lens group provided by the seventh embodiment of the present application has a half field angle of 9 degrees, and the parameters of the surface shape, the curvature radius, the thickness parameter, the refractive index and the dispersion coefficient of each lens for imaging the scanning curved surface 14 are shown in Table 17:

[0201] Table 17: Structural parameters of the optical imaging lens group in the seventh embodiment

[0202] Surface Number Lens Number Surface Shape Radius of Curvature Thickness / Spacing Material Refractive Index Dispersion Coefficient 0 Imaging Plane Plane Infinite Infinite 1 Stop 13 Infinite 1 2 1 Spherical 2.99 0.79 1.76 52.3 3 11.75 0.10 4 2 Spherical 2.57 1.30 1.92 18.9 5 1.26 0.86 6 3 Spherical -1.04 1.23 1.8 44.3 7 -1.75 0.10 8 4 Spherical -3.41 0.40 1.92 18.9 9 6.08 0.18 10 5 Spherical 9.51 1.32 1.59 61.2 11 -2.80 0.10 12 6 Spherical 8.61 1.11 1.5 81.6 13 -6.88 0.32 14 7 Spherical 2.95 1.33 1.66 54.7 15 20.22 0.10 16 8 Spherical 1.69 1.34 2 25.4 17 0.71 0.33 18 Scanning Surface 14 Spherical 1.70

[0203] It should be noted that Table 17 is the detailed structural data of the optical imaging lens group in the seventh embodiment, wherein the units of the curvature radius, the thickness and the focal length are all millimeters, and surfaces 0-18 represent the surfaces in sequence from the first side to the second side; the optical surface with an infinite curvature radius in the imaging plane means a plane.

[0204] ​​​​​​Furthermore, tests showed that when the image light corresponding to the scanning surface is projected using the aforementioned optical imaging lens group, its optical transfer function curve is as follows: Figure 30 As shown, the field distortion curve is as follows: Figure 31 As shown, the vertical axis color difference curve is as follows: Figure 32 As shown; among them, the Modulation Transfer Function (MTF) curve represents the overall resolution level of an optical system, the Field Curve Distortion curve represents the F-Tan (theta) distortion magnitude (percentage) under different field angles, and the Vertical Chromatic Aberration curve represents the magnitude of chromatic aberration in the vertical axis direction.

[0205] Depend on Figures 30-32 Observations show that the optical imaging lens group of Example 7 has good imaging resolution and small optical system distortion and chromatic aberration across the entire field of view. Therefore, the optical imaging lens group can clearly image the scanned curved surface image and has good imaging effect.

[0206] Of course, in practical applications, the optical imaging lens assembly may also include a photosensitive element, a housing, etc. The photosensitive element can be set on the second side of the optical imaging lens assembly, and the optical imaging lens assembly can be installed in the housing. This allows the curved image formed by the image source (such as a fiber optic scanner) to be imaged onto a plane, achieving clear imaging.

[0207] Example Eight

[0208] Figure 33 This is a schematic diagram of an optical imaging lens assembly provided in an embodiment of the present invention. The optical imaging lens assembly includes a first side (i.e., Figure 33 From the side where aperture 15 is located (i.e., the second side) to the third side (i.e., Figure 33 The first lens, second lens, third lens, fourth lens, fifth cemented lens, and sixth lens are sequentially arranged along the optical axis on the same side as the scanning curved surface 16 (corresponding to the image plane of the curved image). It should be noted that the total focal length F of the optical imaging lens assembly provided in this embodiment of the invention... 总 It is 2.915mm, and the working distance F 工作距 It is 0.45mm, F 总 / F 工作距 The radius of concave surface of the lens, which is closer to and opposite to the curved image, is 1.245, Y1 / Y2 is 1.972; Y2 / Y3 is 1.212, |F3 / F 总 | is 1.02.

[0209] More specifically, in this embodiment, the focal length parameters and lens types of each lens in the optical imaging lens group are shown in Table 18 below:

[0210] Table 18. Focal length parameters and lens types of each lens in the optical imaging lens set

[0211]

[0212] Further, the optical imaging lens set provided by Embodiment Eight of the present application has a half field angle of 18 degrees, and the parameters of the surface shape, the curvature radius, the thickness parameter, the refractive index and the dispersion coefficient of each lens in imaging the scanning surface 16 are shown in Table 19:

[0213] Table 19. Structural parameters of the optical imaging lens set in Embodiment Eight

[0214] Surface Number Lens Number Surface Shape Radius of Curvature Thickness / Spacing Material Refractive Index Dispersion Coefficient 0 Imaging Plane Plane Infinite Infinite 1 Stop 15 Infinite 1 2 1 Aspherical -2.44 1.16 1.87 20.6 3 -4.21 1.26 4 2 Spherical 3.50 1.31 1.86 34.8 5 -22.58 1.51 6 3 Spherical -2.41 0.41 1.76 22.7 7 374.59 0.90 8 4 Aspherical -1.68 2.33 1.77 49.6 9 -1.83 0.09 10 5 Spherical 6.40 1.95 1.77 49.6 11 6 Spherical -3.77 0.39 1.92 18.9 12 15.66 0.09 13 7 Aspherical 3.19 2.45 2 25.5 14 1.25 0.44 15 Scanning Surface 16 Spherical 2.0

[0215] It should be noted that Table 19 is the detailed structural data of the optical imaging lens set in Embodiment Eight, wherein the units of the curvature radius, the thickness and the focal length are all millimeters, and the surfaces 0-15 represent the surfaces from the first side to the second side in sequence; the optical surface with an infinite curvature radius in the imaging plane means a plane.

[0216] Further, the aspheric surface coefficients of the lens surfaces with aspheric surface shape in the optical imaging lens set of the present embodiment are shown in Table 20:

[0217] Table 20. Aspheric surface coefficient data of the lens surfaces with aspheric surface shape in Embodiment Eight

[0218]

[0219] Table 20 is the aspheric surface coefficient data in Embodiment Eight, wherein k is the conic coefficient in the aspheric curve equation, and A4 to A16 represent the 4th to 16th order aspheric coefficients of each surface.

[0220] Further, when the image light corresponding to the scanning surface is projected by using the above optical imaging lens set, the Modulation Transfer Function (MTF) curve is shown in Figure 34 , the field curvature distortion curve is shown in Figure 35 , and the axial chromatic aberration curve is shown in Figure 36 ; wherein the Modulation Transfer Function (MTF) curve represents the comprehensive resolution level of an optical system, the field curvature distortion curve represents the F-Tan(theta) distortion size value (percentage) under different field angles, and the axial chromatic aberration curve represents the size of the axial chromatic aberration.

[0221] Figures 34-36 ​Observations show that the optical imaging lens group of Example 8 has good imaging resolution, small optical system distortion and chromatic aberration across the entire field of view. Therefore, the optical imaging lens group can clearly image the scanned curved surface image and has good imaging effect.

[0222] Of course, in practical applications, the optical imaging lens assembly may also include a photosensitive element, a housing, etc. The photosensitive element can be set on the second side of the optical imaging lens assembly, and the optical imaging lens assembly can be installed in the housing. This allows the curved image formed by the image source (such as a fiber optic scanner) to be imaged onto a plane, achieving clear imaging.

[0223] Example Nine

[0224] Figure 37 This is a schematic diagram of an optical imaging lens assembly provided in an embodiment of the present invention. The optical imaging lens assembly includes a first side (i.e., Figure 37 From the side where aperture 17 is located to the second side (that is, Figure 37 The first lens, second lens, third cemented lens, fourth cemented lens, fifth lens, sixth lens, seventh lens, eighth lens, and ninth lens are sequentially arranged along the optical axis on the same side as the scanning curved surface 18 (corresponding to the image plane of the curved image). It should be noted that the total focal length F of the optical imaging lens group provided in this embodiment of the invention... 总 It is 3.07mm, and the working distance F 工作距 It is 0.3mm, F 总 / F 工作距 The value is 10.23, Y1 / Y2 is 1.548, Y2 / Y3 is 1.257, |F7 / F 总 | is 0.36.

[0225] Furthermore, in this embodiment, the focal length parameters and lens types of each lens in the optical imaging lens group are shown in Table 21 below:

[0226] Table 21 Focal length parameters and lens types of each lens in the optical imaging lens group

[0227]

[0228] Furthermore, the optical imaging lens assembly provided in Embodiment 9 of the present invention has a half field of view of 16 degrees. The parameters of the surface shape, radius of curvature, thickness, refractive index, and dispersion coefficient of each lens used to image the scanning surface 18 are shown in Table 22:

[0229] Table 22 Structural parameters of the optical imaging lens assembly in Example 9

[0230]

[0231]

[0232] It is to be noted that Table 22 is the detailed structure data of the optical imaging lens set of Example 9, wherein the units of the curvature radius, the thickness and the focal length are millimeters, and the surfaces 0-22 represent the surfaces from the first side to the second side in sequence; the optical surface with the curvature radius of "infinity" in the imaging plane means a plane.

[0233] Further, the aspheric surface coefficients corresponding to the lens surfaces with aspheric surface shape in each lens of the optical imaging lens set of the present embodiment are shown in Table 23 as follows:

[0234] Table 23 Aspheric surface coefficient data of the lens surfaces with aspheric surface shape in Example 9

[0235] Surface Number 12 13 16 17 K -1.89E+00 2.43E+01 -1.12E+00 -4.26E-01 4th -8.34E-02 -5.33E-02 -5.71E-03 1.68E-02 6th 1.50E-02 3.30E-02 2.73E-03 -1.96E-02 8th 1.52E-01 -3.47E-03 -3.03E-03 1.37E-02 10th -2.58E-01 -5.27E-03 1.68E-03 -4.32E-03 12th 1.92E-01 3.15E-03 -4.63E-04 6.27E-04 14th -7.12E-02 -7.47E-04 6.12E-05 -4.12E-05 16th 1.08E-02 6.97E-05 -3.48E-06 9.11E-07 Surface Number 18 19 20 21 K -2.17E+00 -7.36E-01 6.57E-02 -6.84E+00 4th -1.39E-03 2.34E-02 3.94E-03 -3.71E-02 6th -2.33E-02 -7.89E-02 2.18E-03 1.46E-01 8th 2.16E-02 4.20E-02 1.49E-03 -2.46E-02 10th -9.70E-03 -1.50E-02 3.83E-05 -8.15E-03 12th 2.34E-03 3.59E-03 -1.05E-04 2.11E-03 14th -2.92E-04 -5.15E-04 -1.11E-05 -1.11E-04 16th 1.46E-05 3.44E-05 2.13E-05 -8.94E-03

[0236] Table 23 is the aspheric surface coefficient data in Example 9, wherein k is the conic coefficient in the aspheric curve equation, and A4 to A16 represent the 4th to 16th order aspheric coefficients of each surface.

[0237] Further, when the image light corresponding to the scanning surface is projected by using the optical imaging lens set described above, the optical transfer function curve is as shown in Figure 38 , the field curvature distortion curve is as shown in Figure 39 , and the axial chromatic aberration curve is as shown in Figure 40 ; wherein the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, the field curvature distortion curve represents the F-Tan(theta) distortion size value (percentage) under different field angles, and the axial chromatic aberration curve represents the size of the axial chromatic aberration.

[0238] It can be observed from Figures 38-40 that the imaging resolution of the optical imaging lens set of Example 9 is good within the full field of view, the optical system distortion and chromatic aberration are small, and therefore the optical imaging lens set can clearly image the scanning surface image, and all have good imaging effects.

[0239] Of course, in actual applications, the optical imaging lens set can further include a photosensitive element and a shell, the photosensitive element can be arranged on the second side of the optical imaging lens set, and the optical imaging lens set can be installed in the shell, so that the curved surface image scanned by the image source (such as a fiber scanner) can be imaged on a plane to achieve clear imaging.

[0240] Example Ten

[0241] Figure 41 A structure diagram of an optical imaging lens set provided by the present embodiment. The optical imaging lens set includes a first side (also referred to as a first surface), a second side (also referred to as a second surface), and a lens barrel.Figure 41 From the side where aperture 19 is located (i.e., the second side) to the third side (i.e., Figure 41 The first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, and eighth lens are sequentially arranged along the optical axis on the same side as the scanning curved surface 20 (corresponding to the image plane of the curved image). It should be noted that the total focal length F of the optical imaging lens group provided in this embodiment of the invention... 总 The thickness is 2mm, and the working distance is F. 工作距 It is 0.364mm, F 总 / F 工作距 The value is 5.49, Y1 / Y2 is 2.31, Y2 / Y3 is 1.62, |F8 / F 总 | is 1.5.

[0242] More specifically, in this embodiment, the focal length parameters and lens types of each lens in the optical imaging lens group are shown in Table 24 below:

[0243] Table 24 Focal length parameters and lens types of each lens in the optical imaging lens group

[0244]

[0245]

[0246] Furthermore, the optical imaging lens assembly provided in Embodiment 10 of the present invention has a half field of view of 9 degrees. The parameters of the surface shape, radius of curvature, thickness, refractive index, and dispersion coefficient of each lens used to image the scanning surface 20 are shown in Table 25:

[0247] Table 25 Structural parameters of the optical imaging lens assembly in Example 10

[0248] Surface Number Lens Number Surface Shape Radius of Curvature Thickness / Spacing Material Refractive Index Dispersion Coefficient 0 Imaging Plane Plane Infinite Infinite 1 Stop 19 Infinite 1 2 1 Spherical 6.59 0.70 1.834 37.2 3 44.84 0.10 4 2 Spherical 1.63 0.46 1.82 18.8 5 1.33 1.14 6 3 Spherical -1.24 1.40 1.8 46.7 7 -2.00 0.11 8 4 Spherical -32.65 0.40 1.92 18.8 9 4.06 0.25 10 5 Spherical 5.58 1.52 1.5 81.6 11 -3.48 0.10 12 6 Spherical 4.82 1.27 1.5 81.6 13 -10.09 0.10 14 7 Spherical 2.15 1.32 1.5 81.6 15 8.95 0.10 16 8 Spherical 1.30 0.88 2 25.4 17 0.60 0.36 18 Scanning Surface 20 Spherical 2

[0249] It should be noted that Table 25 contains detailed structural data of the optical imaging lens assembly of Example 10. The units for radius of curvature, thickness and focal length are all millimeters, and surfaces 0-18 sequentially represent the surfaces from the first side to the second side; an optical surface with an "infinite" radius of curvature in the imaging plane refers to a plane.

[0250] Furthermore, tests showed that when the image light corresponding to the scanning surface is projected using the aforementioned optical imaging lens group, its optical transfer function curve is as follows: Figure 42 As shown, the field distortion curve is as follows: Figure 43 As shown, the vertical axis color difference curve is as follows: Figure 44As shown; among them, the Modulation Transfer Function (MTF) curve represents the overall resolution level of an optical system, the Field Curve Distortion curve represents the F-Tan (theta) distortion magnitude (percentage) under different field angles, and the Vertical Chromatic Aberration curve represents the magnitude of chromatic aberration in the vertical axis direction.

[0251] Depend on Figures 42-44 Observations show that the optical imaging lens group of Example 10 has good imaging resolution, small optical system distortion and chromatic aberration across the entire field of view. Therefore, the optical imaging lens group can clearly image the scanned curved surface image and has good imaging effect.

[0252] Of course, in practical applications, the optical imaging lens assembly may also include a photosensitive element, a housing, etc. The photosensitive element can be set on the second side of the optical imaging lens assembly, and the optical imaging lens assembly can be installed in the housing. This allows the curved image formed by the image source (such as a fiber optic scanner) to be imaged onto a plane, achieving clear imaging.

[0253] Example XI

[0254] Figure 45 This is a schematic diagram of an optical imaging lens assembly provided in an embodiment of the present invention. The optical imaging lens assembly includes a first side (i.e., Figure 45 From the side where aperture 21 is located (i.e., the second side) to the second side (that is, Figure 45 The first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, and ninth lens are sequentially arranged along the optical axis on the same side as the scanning curved surface 22 (corresponding to the image plane of the curved image). It should be noted that the total focal length F of the optical imaging lens group provided in this embodiment of the invention... 总 It is 2.6mm, and the working distance F 工作距 It is 1.5mm, F 总 / F 工作距 The radius of concave surface of the lens, which is 1.73 and is close to and opposite to the curved image, is 2 mm. |F3 / F 总 | is 0.93.

[0255] More specifically, in this embodiment, the focal length parameters and lens types of each lens in the optical imaging lens group are shown in Table 26 below:

[0256] Table 26 Focal length parameters and lens types of each lens in the optical imaging lens group

[0257]

[0258] Further, the optical imaging lens provided by the eleventh embodiment of the present application has a half field of view of 9 degrees, and the parameters of the surface shape, the curvature radius, the thickness, the refractive index and the dispersion coefficient of each lens for imaging the scanning surface 22 are shown in Table 27:

[0259] Table 27 Structure parameters of the optical imaging lens in the eleventh embodiment

[0260] Surface number Lens number Surface shape Curvature radius Thickness / spacing Material refractive index Dispersion coefficient 0 Imaging plane Plane Infinite Infinite 1 Stop 21 Infinite 1 2 1 Spherical -17.06 0.74 1.85 35.7 3 -4.39 0.24 4 2 Spherical 6.04 0.72 2 25 5 291.18 0.55 6 3 Spherical -1.77 0.40 1.84 24.5 7 -13.45 0.85 8 4 Aspherical -0.95 1.33 1.92 18.9 9 -1.80 0.10 10 5 Spherical 11.34 1.24 1.76 52.3 11 -4.48 0.15 12 6 Spherical -4.30 0.40 1.78 22.1 13 4.08 0.15 14 7 Spherical 4.31 1.43 1.51 79.5 15 -5.71 0.10 16 8 Aspherical 1.72 1.48 1.76 52.3 17 3.13 0.10 18 9 Spherical 2.50 0.40 2 25.4 19 2.00 1.50 20 Scanning surface 22 Spherical 2.0

[0261] It should be noted that Table 27 is the detailed structure data of the optical imaging lens in the eleventh embodiment, wherein the units of the curvature radius, the thickness and the focal length are millimeters, and the surfaces 0-20 represent the surfaces from the first side to the second side in sequence; the optical surface with an infinite curvature radius in the imaging plane means a plane.

[0262] Further, the aspheric surface coefficients of the lens surfaces with aspheric surface shape in the optical imaging lens of the present embodiment are shown in Table 28:

[0263] Table 28 Aspheric surface coefficient data of the lens surfaces with aspheric surface shape in the eleventh embodiment

[0264] Surface number 8 9 16 17 K -1.86E+00 -4.68E-01 -7.47E-01 2.23E-01 A4 -6.73E-02 3.24E-09 8.67E-05 -2.38E-02 A6 8.25E-03 6.83E-14 5.23E-04 8.02E-04 A8 -3.60E-04 -2.55E-17 -1.47E-05 -6.19E-06

[0265] Table 28 is the aspheric surface coefficient data in the eleventh embodiment, wherein k is the conic coefficient in the aspheric curve equation, and A4 to A8 represent the fourth to eighth order aspheric coefficients of each surface.

[0266] Further, when the image light corresponding to the scanning surface is projected by using the optical imaging lens, the Modulation Transfer Function (MTF) curve is shown in Figure 46 , the field curvature distortion curve is shown in Figure 47 , and the axial chromatic aberration curve is shown in Figure 48 ; wherein the Modulation Transfer Function (MTF) curve represents the comprehensive resolution level of an optical system, the field curvature distortion curve represents the F-Tan(theta) distortion size value (percentage) under different field angles, and the axial chromatic aberration curve represents the size of the axial chromatic aberration.

[0267] As can be seen from Figures 46-48 , the optical imaging lens in the eleventh embodiment has good imaging resolution in the full field of view, small optical system distortion and small chromatic aberration, so that the optical imaging lens can clearly image the scanning surface image, and has good imaging effect.

[0268] Of course, in practical applications, the optical imaging lens group can also include a photosensitive element, a shell, etc. The photosensitive element can be arranged on the second side of the optical imaging lens group, and the optical imaging lens group can be installed in the shell, i.e., the curved image formed by scanning the image source (such as a fiber scanner) can be imaged on a plane to achieve clear imaging.

[0269] Scanning display device

[0270] The foregoing optical imaging lens group can be combined with a fiber scanner (or a corresponding fiber scanning module) to form an application of the optical imaging lens group in the embodiments of the present application, i.e., the optical imaging lens group is applied to a scanning display device (such as a fiber scanning display device) in the field of display imaging. Figure 1a 、 1b As shown in the figure, the optical imaging lens group is arranged on the light path of the fiber scanner), wherein the first side of the optical imaging lens group faces the scanning direction of the fiber scanner, and the preferred mode is that the optical imaging lens group is coaxial with the central optical axis of the fiber scanner. Of course, the structure and general principle of the fiber scanner can refer to the foregoing Figure 1a 、 1b corresponding content, which will not be described in detail here.

[0271] Near-eye display device

[0272] In the present application, the scanning display device can be further applied to a near-eye display device, which can be combined with a near-eye display module to form a near-eye display device in the embodiments of the present application, and used as a head-mounted AR device (such as AR glasses). The scanning display device is arranged in the near-eye display module.

[0273] The near-eye display module can include a light source, a processing control circuit, a wearable frame structure, a waveguide, etc. The image light beam output by the light source enters the scanning display device, is scanned by the fiber scanner in the scanning display device and output to the optical display lens group, the scanning surface of the fiber scanner (which can refer to the scanning surface 02 in the foregoing Figure 5 and the corresponding scanning surface 230 in the foregoing Figure 2 ) is converted into an imaging plane (which can refer to the imaging plane 240 in the foregoing Figure 2 ) after the optical display lens group, and the imaging plane is coupled into the waveguide as an entrance pupil surface of the waveguide, and then expanded and coupled out of the waveguide through the waveguide to enter the human eye.

[0274] As another possible implementation, the scanning display device can be further combined with a near-eye display module to form a near-eye display device in the embodiments of the present application, and used as a head-mounted VR device (such as a VR helmet / glasses). The scanning display device is arranged in the near-eye display module.

[0275] To sum up, in the embodiments of the present application, by defining the working distance of the optical imaging lens group and limiting the numerical range, and by defining Y1, Y2 and Y3 and limiting the proportional relationship of Y1, Y2 and Y3, the optical imaging lens group composed of multiple lenses can clearly image the curved image on the second side, so that the optical imaging lens group can quickly and accurately match the curved image during installation and adjustment. Therefore, the optical imaging lens group provided in the embodiments of the present application not only can realize high-quality and clear imaging of the curved image on the image side, but also is beneficial to reducing the assembly process difficulty of the entire optical imaging lens group, and is also beneficial to realizing batch assembly production at low cost, thereby laying a good technical foundation for product processing and quality control of products containing the optical imaging lens group.

[0276] The above is only the preferred embodiment of the present application, and each embodiment is only used to illustrate the technical solution of the present application, but not to limit the present application. Any technical solution obtained by logical analysis, reasoning or effective experiment according to the concept of the present application should be within the scope of the present application.

[0277] Each embodiment in the present application is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other. Each embodiment mainly describes the difference from other embodiments.

[0278] The expressions "first", "second", "the first" or "the second" used in various embodiments of the present disclosure can modify various components regardless of order and / or importance, but these expressions do not limit the corresponding components. The above expressions are only configured for the purpose of distinguishing elements from other elements. For example, the first lens and the second lens represent different lenses, although both are lenses.

Claims

1. An optical imaging lens, characterized in that, The optical imaging lens group comprises a plurality of lenses, which are sequentially arranged on the same optical axis from a first side to a second side and consist of a first cemented lens, a second lens, a third cemented lens, a fourth lens, a fifth cemented lens, a sixth lens and a seventh lens, the optical powers of the first cemented lens, the second lens, the third cemented lens, the fourth lens, the fifth cemented lens, the sixth lens and the seventh lens are negative positive, positive, positive negative, positive, negative positive, positive and negative respectively, and the second side of the optical imaging lens group corresponds to a curved image; A lens surface close to and opposite to the curved image is a concave surface, and the spacing between the concave surface and the curved image on the optical axis is the working distance of the optical imaging lens group, the working distance is 0.47 mm, and the total focal length is 2.579 mm; The lens with the concave surface has a first side surface and a second side surface from the first side to the second side, and the second side surface corresponds to the concave surface; when the optical imaging lens group works, the light rays and the first side surface, the second side surface and the curved image sequentially form intersection heights Y1, Y2 and Y3 with maximum values, wherein the Y1, the Y2 and the Y3 satisfy the relationship Y1 / Y2 = 1.647 and Y2 / Y3 = 1.

293.

2. The optical imaging lens according to claim 1, wherein, The curved surface of the curved image has the same curved surface orientation as the curved surface of the concave surface.

3. The optical imaging lens according to claim 2, wherein, The curved image is formed by the swing of an optical fiber carrying an optical signal.

4. The optical imaging lens according to claim 2, wherein, The projection of the curved image along the optical axis direction is a curved surface projection, the integral surface area on the curved image is a first integral surface area, the corresponding integral surface area of the first integral surface area on the curved surface projection is a second integral surface area, and the first integral surface area and the second integral surface area correspond one by one; The size of the second integral surface area on the curved surface projection gradually decreases from the center to the periphery.

5. The optical imaging lens according to claim 2, wherein, A tangent plane passing through the center point of the curved image has a normal vector perpendicular to the tangent plane, the normal vector passes through the center point, the center point is the intersection point O of the curved image and the tangent plane, any point P on the curved image except the intersection point O has a corresponding projection point P' on the normal vector, and the displacement D of the intersection point O to the P' satisfies the following relationship: 0 < D < 0.5 mm; The slope of the P point becomes smaller and smaller as the P point moves away from the normal vector.

6. The use of an optical imaging lens according to any one of claims 1 to 5, characterized in that, The optical imaging lens group is applied to the display field or the imaging field.

Images