An optical imaging lens assembly and its application

Abstract

This application discloses an optical imaging lens assembly and its application, relating to the field of display imaging technology. It should be noted that the optical imaging lens assembly provided in this application, by defining and limiting the working distance and exit pupil distance of the optical imaging lens assembly, enables the optical imaging lens assembly composed of multiple lenses to clearly image the curved surface image on the second side. This allows the optical imaging lens assembly to quickly and accurately match the curved surface image during installation and adjustment. Therefore, the optical imaging lens assembly provided in this application not only achieves high-quality and clear imaging of the image-side curved surface image, but also helps to reduce the assembly process difficulty of the entire optical imaging lens assembly, and facilitates mass production at low cost, laying a good technical foundation for the processing quality control of products containing optical imaging lens assemblies.

Description

Technical Field

[0001] This application relates to the field of display imaging technology, specifically to an optical imaging lens assembly and its application. Background Technology

[0002] Display imaging technology is widely used in various industries. Among them, scanning display imaging, as an emerging display technology, can be used in various application scenarios such as projection display and near-eye display.

[0003] However, existing scanning display imaging systems suffer from drawbacks such as high processing difficulty, high mass production cost, and poor imaging quality, which limit the market promotion and application of scanning display imaging technology. This is especially true in the field of fiber optic scanning display technology, where it is difficult to achieve clear imaging of curved surfaces because the image formed during fiber optic scanning is a curved surface. Summary of the Invention

[0004] The purpose of this application is to provide an optical imaging lens assembly and its application to solve the problem of clear imaging of image square curved surfaces.

[0005] This application provides an optical imaging lens assembly, which includes a plurality of lenses arranged coaxially from a first side to a second side, and the second side of the optical imaging lens assembly corresponds to a curved surface image.

[0006] The lens surface that is close to and opposite to the curved image is concave. The distance between the concave surface and the curved image on the optical axis is the working distance of the optical imaging lens group, which is 0.2mm-1.1mm.

[0007] The exit pupil distance of the optical imaging lens group is 1.3-5.3mm.

[0008] Furthermore, in a preferred embodiment of this application, the working distance is 0.3-0.5mm.

[0009] Furthermore, in a preferred embodiment of this application, the working distance is 0.4-0.8 mm.

[0010] Furthermore, in a preferred embodiment of this application, the exit pupil distance is 1.6-3.7 mm.

[0011] Furthermore, in a preferred embodiment of this application, the total focal length of the optical imaging lens group and the working distance 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 [the distance between the two points].

[0012] Furthermore, in a preferred embodiment of this application, the curved surface of the image has the same curved surface orientation as the concave surface orientation.

[0013] Furthermore, in a preferred embodiment of this application, the curved image is formed by the oscillation of an optical fiber carrying an optical signal.

[0014] Furthermore, in a preferred embodiment of this application, the projection of the curved image along the optical axis is a curved projection, the integral surface area on the curved image is a first integral surface area, and the integral surface area corresponding to the first integral surface area on the curved projection is a second integral surface area, with the first integral surface area and the second integral surface area corresponding one-to-one.

[0015] The size of the second integral surface area on the curved surface projection gradually decreases from the center outwards.

[0016] Further, in a preferred embodiment of this application, the tangent plane passing through the center point of the surface image has a normal vector perpendicular to the tangent plane. The normal vector passes through the center point, which is the intersection point O of the surface image and the tangent plane. Any point on the surface image that does not pass through the intersection point O is P. The projection point of point P onto the normal vector is P'. The displacement D from the intersection point O to P' has the following relationship: 0 <D<0.5mm;

[0017] The slope through point P decreases as point P moves further away from the normal vector.

[0018] This application also proposes an application of the optical imaging lens group as described above, which is applied in the display field or the imaging field.

[0019] The technical solutions adopted in the embodiments of this application can achieve the following technical effects:

[0020] In this embodiment, by defining and limiting the working distance and exit pupil distance of the optical imaging lens group, the optical imaging lens group composed of multiple lenses can clearly image the curved surface image on the second side. This allows the optical imaging lens group to quickly and accurately match the curved surface image during installation and adjustment. Therefore, the optical imaging lens group provided in this embodiment not only achieves high-quality and clear imaging of the image-side curved surface image, but also helps to reduce the assembly process difficulty of the entire optical imaging lens group. It also facilitates mass production at low cost, laying a good technical foundation for the quality control of products containing optical imaging lens groups.

[0021] Other features and advantages of this application will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the technical solutions of this application. The objectives and other advantages of this application may be realized and obtained by means of the structures and / or processes particularly pointed out in the description, claims and drawings. Attached Figure Description

[0022] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0023] Figure 1a , 1b This is an illustrative structural diagram of a scanning display system;

[0024] Figure 2 This is a schematic diagram of the scanning output of the fiber optic scanner provided in an embodiment of this application;

[0025] Figure 3a This is a schematic diagram of the optical imaging lens assembly provided in the embodiments of this application regarding concave and curved surface images and working distance;

[0026] Figure 3b This is a schematic diagram of the optical imaging lens assembly provided in the embodiments of this application regarding the exit pupil distance;

[0027] Figure 4 This is a schematic diagram illustrating the structural features of the curved surface image corresponding to the optical imaging lens group provided in the embodiments of this application;

[0028] Figure 5 This is a schematic diagram of the structure of an optical imaging lens assembly provided in Embodiment 1 of this application;

[0029] Figure 6 This is the MTF curve of the optical imaging lens group in Embodiment 1 of this application;

[0030] Figure 7 This is a field curvature distortion curve of the optical imaging lens group in Embodiment 1 of this application;

[0031] Figure 8 This is the transverse chromatic aberration diagram of the optical imaging lens group in Embodiment 1 of this application;

[0032] Figure 9 This is a schematic diagram of the optical imaging lens assembly provided in Embodiment 2 of this application;

[0033] Figure 10 This is the MTF curve of the optical imaging lens group in Embodiment 2 of this application;

[0034] Figure 11 This is a field curvature distortion curve of the optical imaging lens group in Embodiment 2 of this application;

[0035] Figure 12 This is the transverse chromatic aberration diagram of the optical imaging lens group in Embodiment 2 of this application;

[0036] Figure 13 This is a schematic diagram of the optical imaging lens assembly provided in Embodiment 3 of this application;

[0037] Figure 14 This is the MTF curve of the optical imaging lens group in Embodiment 3 of this application;

[0038] Figure 15 This is a field curvature distortion curve of the optical imaging lens group in Embodiment 3 of this application;

[0039] Figure 16 This is the transverse chromatic aberration diagram of the optical imaging lens group in Embodiment 3 of this application;

[0040] Figure 17 This is a schematic diagram of the optical imaging lens assembly provided in Embodiment 4 of this application;

[0041] Figure 18 This is the MTF curve of the optical imaging lens group in Embodiment 4 of this application;

[0042] Figure 19 This is a field curvature distortion curve of the optical imaging lens group in Embodiment 4 of this application;

[0043] Figure 20 This is the transverse chromatic aberration diagram of the optical imaging lens group in Embodiment 4 of this application;

[0044] Figure 21 This is a schematic diagram of the optical imaging lens assembly provided in Embodiment 5 of this application;

[0045] Figure 22 This is the MTF curve of the optical imaging lens group in Embodiment 5 of this application;

[0046] Figure 23 This is a field curvature distortion curve of the optical imaging lens group in Embodiment 5 of this application;

[0047] Figure 24 This is the transverse chromatic aberration diagram of the optical imaging lens group in Embodiment 5 of this application;

[0048] Figure 25 This is a schematic diagram of the optical imaging lens assembly provided in Embodiment Six of this application;

[0049] Figure 26 This is the MTF curve of the optical imaging lens group in Embodiment Six of this application;

[0050] Figure 27 This is a field curvature distortion curve of the optical imaging lens group in Embodiment Six of this application;

[0051] Figure 28 This is the transverse chromatic aberration diagram of the optical imaging lens group in Embodiment Six of this application;

[0052] Figure 29 This is a schematic diagram of the structure of the optical imaging lens assembly provided in Embodiment 7 of this application;

[0053] Figure 30 This is the MTF curve of the optical imaging lens group in Embodiment 7 of this application;

[0054] Figure 31 This is a field curvature distortion curve of the optical imaging lens group in Embodiment 7 of this application;

[0055] Figure 32 This is the transverse chromatic aberration diagram of the optical imaging lens group in Embodiment 7 of this application;

[0056] Figure 33 This is a schematic diagram of the structure of the optical imaging lens assembly provided in Embodiment 8 of this application;

[0057] Figure 34 This is the MTF curve of the optical imaging lens group in Embodiment 8 of this application;

[0058] Figure 35 This is a field curvature distortion curve of the optical imaging lens group in Embodiment 8 of this application;

[0059] Figure 36 This is the transverse chromatic aberration diagram of the optical imaging lens group in Embodiment 8 of this application;

[0060] Figure 37 This is a schematic diagram of the structure of the optical imaging lens assembly provided in Embodiment 9 of this application;

[0061] Figure 38 This is the MTF curve of the optical imaging lens group in Embodiment 9 of this application;

[0062] Figure 39 This is a field curvature distortion curve of the optical imaging lens group in Embodiment 9 of this application;

[0063] Figure 40 This is the transverse chromatic aberration diagram of the optical imaging lens group in Embodiment 9 of this application;

[0064] Figure 41 This is a schematic diagram of the structure of the optical imaging lens assembly provided in Embodiment 10 of this application;

[0065] Figure 42 This is the MTF curve of the optical imaging lens group in Embodiment 10 of this application;

[0066] Figure 43 This is a field curvature distortion curve of the optical imaging lens group in Embodiment 10 of this application;

[0067] Figure 44 This is the chromatic aberration diagram of the optical imaging lens group in Embodiment 10 of this application.

[0068] Icons: 100-Processor; 110-Laser assembly; 120-Fiber optic scanning module; 130-Transmission fiber; 140-Light source modulation circuit; 150-Scanning drive circuit; 160-Beam combining unit; 121-Scanning actuator; 121a-Slow axis; 121b-Fast axis; 122-Fiber optic cantilever; 123-Mirror assembly; 124-Scanner housing; 125-Fixture; 230-Scanning surface; 240- Imaging plane; 01-Aperture; 02-Scanning surface; 03-Aperture; 04-Scanning surface; 05-Aperture; 06-Scanning surface; 07-Aperture; 08-Scanning surface; 09-Aperture; 10-Scanning surface; 11-Aperture; 12-Scanning surface; 13-Aperture; 14-Scanning surface; 15-Aperture; 16-Scanning surface; 17-Aperture; 18-Scanning surface; 19-Aperture; 20-Scanning surface. Detailed Implementation

[0069] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0070] First, it should be noted that, in order to enable those skilled in the art to have a clearer and deeper understanding of the technical inventive points and functions of the optical imaging lens assembly provided in this application, the applicant will first provide an illustrative description of the application scenarios of the optical imaging lens assembly provided in this application:

[0071] Explanatory Scanning Display System

[0072] Current scanning display imaging can be achieved using micro-electro-mechanical systems (MEMS) or fiber scanning display (FSD) devices. Among these, the FSD approach, as a novel scanning display imaging method, uses a fiber optic scanner to achieve image scanning output. To enable those skilled in the art to clearly understand the scheme of this application, a brief explanation of the principles and corresponding system of fiber optic scanning imaging is provided below.

[0073] like Figure 1a The image shown is an illustrative scanning display system according to this application, which mainly includes:

[0074] The system includes a processor 100, a laser assembly 110, a fiber optic scanning module 120, a transmission fiber optic cable 130, a light source modulation circuit 140, a scanning drive circuit 150, and a beam combining unit 160.

[0075] The processor 100 can be a graphics processing unit (GPU), a central processing unit (CPU), or other chips or circuits with control and image processing functions, without being specifically limited here.

[0076] When the system is working, 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 contains multiple monochromatic lasers, each emitting a beam of a different color. Figure 1a As 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.

[0077] 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.

[0078] 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.

[0079] Continue to refer to Figure 1bThe 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.

[0080] like Figure 2 As 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.

[0081] 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.

[0082] 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.

[0083] Optical imaging lens group

[0084] Please refer to Figure 1- Figure 3b The optical imaging lens assembly in this embodiment includes multiple lenses arranged coaxially from the first side to the second side. The second side of the optical imaging lens assembly corresponds to the curved image. The lens surface closest to and opposite the curved image is concave. The distance between the concave surface and the curved image on the optical axis is the working distance of the optical imaging lens assembly, which is 0.2mm-1.1mm. The exit pupil distance of the optical imaging lens assembly is 1.3-5.3mm. It is important to emphasize that, in this embodiment, by defining and limiting the working distance and exit pupil distance of the optical imaging lens assembly, the optical imaging lens assembly composed of multiple lenses can clearly image the curved image on the second side. This allows the optical imaging lens assembly to quickly and accurately match the curved image during installation and adjustment. Therefore, the optical imaging lens assembly provided in this embodiment not only achieves high-quality and clear imaging of the image-side curved image but also reduces the assembly process difficulty of the entire optical imaging lens assembly. It also facilitates mass production at low cost, laying a solid technical foundation for quality control in the processing of products containing optical imaging lens assemblies. It should be emphasized that, regarding the numerical limitation of the working distance, the preferred working distance in this embodiment is 0.4-0.8mm or 0.3-0.5mm; and regarding the numerical limitation of the exit pupil distance, the preferred exit pupil distance in this embodiment is 1.6-3.7mm.

[0085] Further explanation is needed; please refer to... Figure 3b In this embodiment, the multiple lenses of the optical imaging lens group are arranged coaxially from the entrance pupil position to the exit pupil position. The exit pupil position of the optical imaging lens group corresponds to the curved image, that is, to the second side of the optical imaging lens group; the entrance pupil position of the optical imaging lens group corresponds to the first side of the optical imaging lens group. Please refer to Figures 1 through 1. Figure 3b Among multiple lenses, the lens surface closest to and opposite the exit pupil position (i.e., the lens surface closest to the curved image) is concave. The optical axis and the concave surface intersect to form an intersection point, and the distance between the intersection point and the exit pupil position is the exit pupil distance.

[0086] Further explanation is needed; please continue to refer to... Figure 3b From left to right, that is, from the first side to the second side, the sequence is: entrance pupil (entrance pupil position), optical imaging lens group, and exit pupil (exit pupil position). Specifically:

[0087] Entrance pupil: The entrance pupil is the effective aperture that restricts the incident light beam. It is the image formed by the aperture stop on the optical system in front of it. It is the conjugate phase of the aperture stop in object space. The entrance pupil and the exit pupil are opposites.

[0088] Entrance pupil position: The entrance pupil position is the position point where the aperture stop forms an image of the optical system in front. The entrance pupil position is calculated by taking the center of the aperture stop as an object point, tracing the light rays in front of the optical system, and obtaining the coordinates of the intersection point with the optical axis. Usually, the distance from the surface of the first lens is used as the entrance pupil distance.

[0089] Exit pupil: The image formed by the aperture stop of an optical system in the image space of the optical system is the exit pupil of the lens;

[0090] Exit pupil position: The exit pupil position is the position point where the aperture stop images the rear optical system. The exit pupil position is calculated by taking the center of the aperture stop as an object point, tracing the light rays towards the rear optical system, and obtaining the coordinates of the intersection point with the point on the optical axis. Usually, the distance from the last lens surface is used as the exit pupil distance.

[0091] Measurement of exit pupil position: Set a point light source at the center of the entrance pupil position and image it through the designed lens. The optimal imaging position of the point light source is the exit pupil position.

[0092] More specifically, in one possible implementation, the total focal length and 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 F is the total focal length of the optical imaging lens group. 工作距 This refers to the working distance of the optical imaging lens group. 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.

[0093] Furthermore, in one possible implementation, please continue to refer to... Figure 3a 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 curved surface can be well adapted to the curved surface, which is beneficial for receiving light from a wide angle of view, thereby capturing more comprehensive and sufficient information from the curved surface image.

[0094] Further, in a possible implementation, the curved surface image is formed by the swinging of an optical fiber carrying an optical signal, such as the curved surface image formed by the swinging of the optical fiber on the optical fiber scanner described above. Of course, it should be noted that in other embodiments of the present application, the formation method of the curved surface image is not limited to this embodiment, and it can also be a curved surface image formed by other methods, such as a curved surface image formed by a continuously output light source moving or a curved surface image formed by a self-luminous source.

[0095] Further optionally, in a possible implementation, the projection of the curved surface image along the optical axis direction is a curved surface projection. The integral surface area on the curved surface image is the first integral surface area, and the integral surface area corresponding to the first integral surface area on the curved surface projection is the second integral surface area. The first integral surface area and the second integral surface area correspond one by one. It should be noted that the size of the second integral surface area on the curved surface projection gradually decreases from the center to the periphery.

[0096] Further optionally, in a possible implementation, please refer to Figure 4 , the tangent plane passing through the center point of the curved surface image has a normal vector perpendicular to the tangent plane. The normal vector passes through the center point, and the center point is the intersection point O of the curved surface image and the tangent plane. Any point P on the curved surface image that does not pass through the intersection point O is taken. The projection point of point P on the normal vector is P'. There is the following relationship for the displacement D from the intersection point O to P': 0 < D < 0.5 mm. It should be noted that the slope passing through point P becomes smaller as point P moves away from the normal vector.

[0097] Further, in a possible implementation, the connection method between multiple lenses can be spaced connection or can be glued together by an adhesive method, 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 multiple lenses is preferably 6, 7, 8, and 9; it should be emphasized that in other embodiments of the present application, the number of the multiple lenses is not limited, and it can be 3, 4, 5, 10, 11, etc.

[0098] Further, in some embodiments, the surface shape of the lens is not concave or convex on the entire side surface. The surface shape of the lens may be a composite curved surface, or the part near the optical axis is a curved surface while the edge part is not a curved surface; particularly optionally, when the surface of the lens 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 surface of the lens 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] Example 1

[0103] 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, and the exit pupil distance is 2.084 mm.

[0104] 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:

[0105] Table 1. Focal length parameters and lens types of each lens in the optical imaging lens group.

[0106]

[0107] 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:

[0108] Table 2 Structural parameters of the optical imaging lens assembly in Example 1

[0109]

[0110]

[0111] 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.

[0112] 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:

[0113] Table 3. Aspheric coefficient data for lens surfaces with aspherical shapes in Example 1.

[0114] Surface serial 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

[0115] 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.

[0116] 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 8 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.

[0117] Depend on Figures 6-8Observations 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.

[0118] 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.

[0119] Example 2

[0120] 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, and the exit pupil distance is 2.93mm.

[0121] 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:

[0122] Table 4. Focal length parameters and lens types of each lens in the optical imaging lens group.

[0123]

[0124]

[0125] Furthermore, the optical imaging lens assembly provided in Embodiment 2 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 04 are shown in Table 5:

[0126] Table 5 Structural parameters of the optical imaging lens assembly in Example 2

[0127] Surface serial number Lens serial number face shape radius of curvature Thickness / Spacing Material refractive index Dispersion coefficient 0 Imaging plane flat unlimited unlimited 1 Aperture 03 unlimited 1 2 1 spherical -5.20 1.94 2 25.4 3 2 spherical 4.24 1.92 1.5 81.6 4 -3.30 0.69 5 3 aspherical 8.80 1.63 1.92 18.9 6 -8.27 0.62 7 4 spherical 6.04 1.78 1.5 81.6 8 5 spherical -2.63 0.40 1.84 27.8 9 21.18 1.66 10 6 aspherical -0.73 0.40 1.8 21.6 11 -4.71 0.10 12 7 spherical 4.56 0.40 1.64 28.6 13 2.74 0.10 14 8 aspherical 1.59 1.92 1.77 49.6 15 -2.47 0.07 16 9 aspherical 1.40 1.36 1.5 81.6 17 0.70 0.24 18 10 spherical 3.33 0.65 1.7 30.1 19 2.23 0.21 20 Scan Surface 04 spherical 1.6

[0128] It should be noted that Table 5 contains detailed structural data of the optical imaging lens group in Embodiment 2. The units for radius of curvature, thickness and focal length are all millimeters, and surfaces 0-20 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.

[0129] 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 6 below:

[0130] Table 6. Aspherical coefficient data for lens surfaces with aspherical shapes in Example 2.

[0131]

[0132]

[0133] Table 6 shows the aspheric coefficient data in Example 2, 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.

[0134] 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 10 As shown, the field distortion curve is as follows: Figure 11 As shown, the vertical axis color difference curve is as follows: Figure 12 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.

[0135] Depend on Figures 10-12 Observations show that the optical imaging lens group of Example 2 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.

[0136] 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.

[0137] Example 3

[0138] Figure 13This 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 13 From the side where aperture 05 is located (to the second side, that is, Figure 13 The first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth lenses are sequentially arranged along the optical axis on the side where the scanning surface 06 (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 3.19mm, and the working distance is F. 工作距 It is 1.08mm, F 总 / F 工作距 The value is 2.95, and the exit pupil distance is 1.72mm.

[0139] 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 7 below:

[0140] Table 7 Focal length parameters and lens types of each lens in the optical imaging lens group

[0141]

[0142] Furthermore, the optical imaging lens assembly provided in Embodiment 3 of the present invention has a half field of view of 9 degrees. The surface shape, radius of curvature, thickness parameters, refractive index, and dispersion coefficient of each lens used to image the scanning surface 06 are shown in Table 8.

[0143] Table 8 Structural parameters of the optical imaging lens assembly in Example 3

[0144]

[0145]

[0146] It should be noted that Table 8 contains detailed structural data of the optical imaging lens group in Embodiment 3. The units for radius of curvature, thickness and focal length are all millimeters, and surfaces 0-20 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.

[0147] 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 16As 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.

[0148] 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.

[0149] 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.

[0150] Example 4

[0151] 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 The value is 8.03, and the exit pupil distance is 1.347mm.

[0152] 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:

[0153] Table 9. Focal length parameters and lens types of each lens in the optical imaging lens group.

[0154]

[0155] Furthermore, the optical imaging lens assembly provided in Embodiment 4 of the present invention has a half field of view of 9 degrees. The surface shape, radius of curvature, thickness parameters, refractive index, and dispersion coefficient of each lens used to image the scanning surface 08 are shown in Table 10:

[0156] Table 10 Structural parameters of the optical imaging lens assembly in Example 4

[0157]

[0158]

[0159] It should be noted that Table 10 contains detailed structural data of the optical imaging lens group in Embodiment 4. 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.

[0160] 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 18 As shown, the field distortion curve is as follows: Figure 19 As shown, the vertical axis color difference curve is as follows: Figure 20 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.

[0161] Depend on Figures 18-20 Observations show that the optical imaging lens group in Example 4 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.

[0162] 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.

[0163] Example 5

[0164] Figure 21 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 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, and the exit pupil distance is 1.7647mm.

[0165] 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:

[0166] Table 11 Focal length parameters and lens types of each lens in the optical imaging lens group

[0167]

[0168] 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:

[0169] Table 12 Structural parameters of the optical imaging lens assembly in Example 5

[0170]

[0171]

[0172] 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.

[0173] 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 24 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.

[0174] 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.

[0175] 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.

[0176] Example 6

[0177] 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, and the exit pupil distance is 2.7mm.

[0178] 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:

[0179] Table 13 Focal length parameters and lens types of each lens in the optical imaging lens group

[0180]

[0181] Furthermore, the optical imaging lens assembly provided in Embodiment Six 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 12 are shown in Table 14:

[0182] Table 14 Structural parameters of the optical imaging lens assembly in Example 6

[0183]

[0184]

[0185] It should be noted that Table 14 contains detailed structural data of the optical imaging lens assembly of Example 6. The units for radius of curvature, thickness and focal length are all millimeters, and surfaces 0-21 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.

[0186] 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 15 below:

[0187] Table 15 Aspheric coefficient data for lens surfaces with aspherical shapes in Example 6

[0188]

[0189] Table 15 shows the aspheric coefficient data in Example 6, 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.

[0190] 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 26 As shown, the field distortion curve is as follows: Figure 27 As shown, the vertical axis color difference curve is as follows: Figure 28 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.

[0191] Depend on Figures 26-28 Observations show that the optical imaging lens group of Example 6 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.

[0192] 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.

[0193] Example 7

[0194] Figure 29 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 29 From the side where aperture 13 is located (i.e., the second side) to the third side (i.e., Figure 29 The first, second, third, fourth, fifth, sixth, seventh, and eighth lenses are sequentially arranged along the optical axis on the same side as the scanning surface 14 (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 3mm, working distance F 工作距 It is 0.33mm, F 总 / F 工作距 The value is 9.09, and the exit pupil distance is 1.6mm.

[0195] 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 16 below:

[0196] Table 16 Focal length parameters and lens types of each lens in the optical imaging lens group

[0197]

[0198] Furthermore, the optical imaging lens assembly provided in Embodiment 7 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 14 are shown in Table 17:

[0199] Table 17 Structural parameters of the optical imaging lens assembly in Example 7

[0200]

[0201]

[0202] It should be noted that Table 17 contains detailed structural data of the optical imaging lens group in Example 7. 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.

[0203] 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.

[0204] 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.

[0205] 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.

[0206] Example 8

[0207] 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 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 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 group provided in this embodiment of the invention... 总 It is 2.6mm, and the working distance F 工作距 It is 0.8mm, F 总 / F 工作距 The value is 3.25, and the exit pupil distance is 1.36mm.

[0208] Furthermore, 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:

[0209] Table 18 Focal length parameters and lens types of each lens in the optical imaging lens group

[0210]

[0211] Furthermore, the optical imaging lens assembly provided in Embodiment 8 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 16 are shown in Table 19:

[0212] Table 19 Structural parameters of the optical imaging lens assembly in Example 8

[0213]

[0214]

[0215] It should be noted that Table 19 contains detailed structural data of the optical imaging lens group of Embodiment 8. The units of radius of curvature, thickness and focal length are all in millimeters, and surfaces 0-20 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.

[0216] 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 20 below:

[0217] Table 20 Aspheric coefficient data for lens surfaces with aspherical shapes in Example 8

[0218] Surface serial number 8 9 16 17 K -1.95E+00 -3.67E-01 -7.72E-01 -7.84E-02 A4 -8.07E-02 -2.85E-03 9.78E-05 -2.84E-02 A6 4.76E-03 8.32E-07 4.79E-04 1.07E-03 A8 -1.76E-05 -4.52E-05 -9.41E-06 7.28E-05

[0219] Table 20 shows the aspheric coefficient data in Example 8, where k is the conical coefficient in the aspheric curve equation, and A4 to A8 represent the 4th to 8th order aspheric coefficients of each surface.

[0220] 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 34 As shown, the field distortion curve is as follows: Figure 35 As shown, the vertical axis color difference curve is as follows: Figure 36 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.

[0221] Depend on 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 9

[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 37The 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, and the exit pupil distance is 3.7mm.

[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] Surface serial number Lens serial number face shape radius of curvature Thickness / Spacing Material refractive index Dispersion coefficient 0 Imaging plane flat unlimited unlimited 1 Aperture 17 unlimited 1 2 1 spherical -4.00 0.39 1.94 21 3 11.32 0.43 4 2 spherical -4.13 1.21 1.74 52.9 5 -2.94 0.38 6 3 spherical 5.74 1.61 1.92 18.9 7 4 spherical -35.58 0.66 1.71 54.5 8 -9.27 0.14 9 5 spherical 2.78 1.58 1.5 79.9 10 6 spherical -5.27 0.41 1.84 23 11 2.93 1.45 12 7 aspherical -0.86 0.75 1.88 19.6 13 -9.36 0.08 14 8 spherical -9.74 1.46 1.76 52.3 15 -2.89 0.09 16 9 aspherical 2.00 1.31 1.74 53.3 17 6.02 0.09 18 10 aspherical 2.02 1.36 1.5 81.6 19 1.60 0.13 20 11 aspherical 2.11 1.25 2 25.4 21 1.25 0.30 22 Scan Surface 18 spherical 1.5

[0231] It should be noted that Table 22 contains detailed structural data of the optical imaging lens group of Embodiment 9. The units of radius of curvature, thickness and focal length are all in millimeters, and surfaces 0-22 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.

[0232] 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 23 below:

[0233] Table 23 Aspheric coefficient data for lens surfaces with aspherical shapes in Example 9

[0234]

[0235]

[0236] Table 23 shows the aspheric coefficient data in Example 9, 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.

[0237] 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 38 As shown, the field distortion curve is as follows: Figure 39 As shown, the vertical axis color difference curve is as follows: Figure 40 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.

[0238] Depend on Figures 38-40 Observations show that the optical imaging lens group of Example 9 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.

[0239] 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.

[0240] Example 10

[0241] Figure 41 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 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 cemented lens, and sixth 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 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 value is 6.63, and the exit pupil distance is 5.3mm.

[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] Furthermore, the optical imaging lens assembly provided in Embodiment 10 of the present invention has a half field of view of 18 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:

[0246] Table 25 Structural parameters of the optical imaging lens assembly in Example 10

[0247] Surface serial number Lens serial number face shape radius of curvature Thickness / Spacing Material refractive index Dispersion coefficient 0 Imaging plane flat unlimited unlimited 1 Aperture 19 unlimited 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 Scan Surface 20 spherical 2.0

[0248] 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 0-15 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.

[0249] 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 26 below:

[0250] Table 26 Aspheric coefficient data for lens surfaces with aspherical shapes in Example 10

[0251]

[0252] Table 26 shows the aspheric coefficient data in Example 10, 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.

[0253] 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 44 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.

[0254] 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.

[0255] 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.

[0256] Scanning display device

[0257] The aforementioned optical imaging lens assembly can be used in conjunction with a fiber optic scanner (or a corresponding fiber optic scanning module) to constitute the application of the optical imaging lens assembly in the embodiments of this application, that is, the optical imaging lens assembly is applied to a scanning display device in the field of display imaging (such as...). Figure 1a , 1b As shown, the optical imaging lens group is positioned on the output optical path of the fiber optic scanner. The first side of the optical imaging lens group faces the scanning output direction of the fiber optic scanner. Preferably, the optical imaging lens group is coaxial with the central optical axis of the fiber optic scanner. Of course, the structure and general principle of the fiber optic scanner can be found in the aforementioned... Figure 1a , 1b The corresponding content will not be elaborated on here.

[0258] Near-eye display devices

[0259] In this application, the scanning display device can be further applied to a near-eye display device, and can be used in conjunction with a near-eye display module to form the near-eye display device in the embodiments of this application, for use as a head-mounted AR device (such as AR glasses). The scanning display device is disposed in the near-eye display module.

[0260] The near-eye display module may include: a light source, processing and control circuitry, a wearable frame structure, and a waveguide. The image beam output from the light source enters the scanning display device, where it is scanned by a fiber optic scanner and output to the optical display lens assembly. The scanning surface of the fiber optic scanner (see reference) Figure 5 The scan surface 02 and its corresponding Figure 2 The scanning surface 230 in the image is converted into an imaging plane after passing through the optical display lens group (refer to the corresponding...). Figure 2 The imaging plane 240 in the waveguide is coupled into the waveguide as the entrance pupil surface, and then coupled out through the waveguide to enter the human eye.

[0261] As another possible implementation, the scanning display device can be further combined with the near-eye display module to form the near-eye display device in the embodiments of this application, and used as a head-mounted VR device (such as a VR helmet / glasses). The scanning display device is disposed in the near-eye display module.

[0262] In summary, the optical imaging lens assembly provided in this application, by defining and limiting the working distance and exit pupil distance of the optical imaging lens assembly, enables the optical imaging lens assembly composed of multiple lenses to clearly image the curved surface image on the second side. This allows the optical imaging lens assembly to quickly and accurately match the curved surface image during installation and adjustment. Therefore, the optical imaging lens assembly provided in this application not only achieves high-quality and clear imaging of the image-side curved surface image, but also helps to reduce the assembly process difficulty of the entire optical imaging lens assembly. It also facilitates mass production at low cost, laying a good technical foundation for the processing quality control of products containing optical imaging lens assemblies.

[0263] The above description is merely a preferred embodiment of this application. Each embodiment is only used to illustrate the technical solution of this application and is not intended to limit this application. Any technical solution that can be obtained by those skilled in the art through logical analysis, reasoning or effective experimentation based on the concept of this application should be within the scope of this application.

[0264] The various embodiments in this application are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0265] The terms "first," "second," "first," or "second" as used in the various embodiments of this disclosure may modify various components regardless of their order and / or importance, but these terms do not limit the corresponding components. The above terms are configured only for the purpose of distinguishing an element from other elements. For example, a first lens and a 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 arranged in sequence on the same optical axis from a first side to a second side, 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, the spacing between the concave surface and the curved image on the optical axis is a working distance of the optical imaging lens group, the working distance is 1.08mm, and a ratio of a total focal length of the optical imaging lens group to the working distance is 2.95; An exit pupil distance of the optical imaging lens group is 1.72mm; The plurality of lenses are all spherical lenses, and the plurality of lenses are sequentially arranged on the same optical axis from a first side to a second side and consist of 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, and the refractive power distribution of the first lens to the ninth lens is positive, negative, negative, positive, positive, negative, positive, positive and negative.

2. The optical imaging lens according to claim 1, wherein, The curved surface of the curved image is in the same direction 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 swinging 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 direction of the optical axis 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 are one-to-one corresponding; 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, the corresponding projection point P' of the P point on the normal vector, and the displacement D from the intersection point O to the P' point satisfies the following relationship: 0<D<0.5mm; 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