Optical imaging lens group and scanning display device

Abstract

The utility model discloses an optical imaging lens group and a scanning display device, and relates to the technical field of scanning display. The optical imaging lens group provided by the utility model comprises the first lens to the ninth lens which are sequentially arranged along the same optical axis from the second side to the first side, and by adopting the full-spherical optical imaging lens group of the projection objective lens structure, the requirements of a large view field, small distortion and high resolution are met, and meanwhile, small size, light weight and high resolution are taken into account. Meanwhile, the design of the full-spherical lens also has the advantages of low cost and quick verification.

Description

Technical Field

[0001] The present application relates to the field of scanning display technology, and in particular to an optical imaging lens assembly and a scanning display device. Background Art

[0002] Scanning display imaging, as an emerging display technology, can be used in a variety of application scenarios such as projection display and near-eye display.

[0003] However, existing scanning display imaging systems usually use eyepiece-type vehicle-mounted projection lenses for imaging. Due to the structural characteristics of eyepiece-type vehicle-mounted projection lenses, it is difficult to balance aberrations such as coma and astigmatism in the imaging process under a large field of view, resulting in the eyepiece-type vehicle-mounted projection lens being difficult to take into account both a large field of view and high-quality imaging characteristics. Utility Model Content

[0004] The purpose of this application is to provide an optical imaging lens group and a scanning display device to meet the requirements of large field of view, small distortion and high resolution in vehicle-mounted projection scenarios.

[0005] Another object of the present application is to provide an application of a scanning display device, which is configured for use in the field of vehicle-mounted projection and has the characteristics of high imaging quality, miniaturization, and light weight.

[0006] The present application provides an optical imaging lens group, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, an aperture, a sixth lens, a seventh lens, an eighth lens and a ninth lens, which are arranged in sequence along the second side to the first side on a common optical axis, wherein the second side corresponds to a curved surface image at a light source end, and the curved surface image is formed by configuring an optical fiber scanner; wherein the object side surfaces of the first lens, the eighth lens and the ninth lens are all concave surfaces, the image side surfaces of the first lens, the eighth lens and the ninth lens are all convex surfaces, the object side surfaces of the third lens and the sixth lens are all convex surfaces, the image side surface of the sixth lens is a concave surface or a convex surface, the fourth lens and the seventh lens are both biconcave lenses, the fifth lens is a biconvex lens, the object side surface and the image side surface of the second lens are concave surfaces and convex surfaces respectively, or the second lens is a biconvex lens.

[0007] Furthermore, in a preferred embodiment of the present application, the optical powers corresponding to the first lens to the ninth lens are negative, positive, positive, negative, positive, positive, negative, negative, and positive, respectively.

[0008] Furthermore, in a preferred embodiment of the present application, the ratio of the focal length of the first lens to the total focal length of the optical imaging lens assembly is in the range of -61.18 to -5.77.

[0009] Furthermore, in a preferred embodiment of the present application, the fourth lens and the fifth lens are combined to form a cemented lens and form a common intermediate surface.

[0010] Furthermore, in a preferred embodiment of the present application, the ratio of the focal length of the fourth lens to the total focal length of the optical imaging lens assembly is in the range of -0.93 to -0.74.

[0011] Furthermore, in a preferred embodiment of the present application, the ratio of the focal length of the seventh lens to the total focal length of the optical imaging lens assembly is in the range of -1.09 to -0.81.

[0012] Furthermore, in a preferred embodiment of the present application, part of the light beam of the curved image is reflected by the first lens and forms a paraxial focal plane on the second side, and the distance between the object side surface of the first lens and the paraxial focal plane on the optical axis is in the range of -5.07 mm to -4.37 mm.

[0013] The present application also provides a scanning display device, which includes a fiber scanner and the aforementioned optical imaging lens group, wherein the fiber scanner is used to scan and emit light of an image to be displayed, and the optical imaging lens group is used to magnify, image and project a scanning surface corresponding to the light emitted by the fiber scanner; wherein the fiber scanner includes an actuator and an optical fiber fixed to the actuator, and the portion of the optical fiber that exceeds the actuator forms a fiber cantilever, and the fiber cantilever performs two-dimensional scanning under the drive of the actuator.

[0014] The present application also provides an application of the scanning display device as described above, which includes: configuring the scanning display device in the field of vehicle-mounted display.

[0015] The following technical effects can be achieved by using the technical solution in the embodiments of the present application:

[0016] (1) The full-spherical optical imaging lens group adopts a projection objective structure, which meets the requirements of large field of view, small distortion, and high resolution while taking into account small size and light weight;

[0017] (2) The full-spherical lens design takes into account the advantages of low cost and rapid verification;

[0018] (3) By making one surface of the lens in the optical imaging lens group have a reflective function, most of the light of the image at the light source end can pass through the reflective surface and form a forward projection image plane on the first side through the subsequent optical path, and the reflective surface reflects a small amount of light from the image at the light source end and forms a reverse optical path image plane on the second side. In a specific application, the image at the light source end can be feedback corrected by collecting image information of the reverse optical path image plane;

[0019] (4) By configuring the above-mentioned optical imaging lens group in a fiber scanner, a miniaturized and lightweight scanning display device is formed, and the scanning display device is configured and applied in the field of vehicle-mounted projection, which can meet the requirements of large viewing angle, high resolution and low distortion of vehicle-mounted projection.

[0020] Other features and advantages of the present application will be described in the subsequent description, and partly become apparent from the description, or understood by implementing the technical solution of the present application. The purpose and other advantages of the present application can be realized and obtained through the structures and / or processes specifically pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0022] Figure 1a , 1b is a schematic diagram of the structure of an illustrative scanning display system;

[0023] Figure 2 is a schematic diagram of the scanning output of the optical fiber scanner provided in an embodiment of the present application;

[0024] Figure 3 is a structural schematic diagram of an optical imaging lens assembly provided in Example 1 of the present application;

[0025] Figure 4 This is a schematic diagram of the optical path of reverse imaging of an optical imaging lens assembly provided in Example 1 of the present application;

[0026] Figure 5 is an MTF curve diagram of the optical imaging lens assembly in Example 1 of the present application;

[0027] Figure 6 is a field curvature distortion curve diagram of the optical imaging lens assembly in the first embodiment of the present application;

[0028] Figure 7 is a vertical axis chromatic aberration diagram of the optical imaging lens assembly in Example 1 of the present application;

[0029] Figure 8 is a structural schematic diagram of an optical imaging lens assembly provided in Example 2 of the present application;

[0030] Fig. 9 is an MTF curve diagram of the optical imaging lens assembly in the second embodiment of the present application;

[0031] Fig.10 is a field curvature distortion curve diagram of the optical imaging lens assembly in the second embodiment of the present application;

[0032] Fig.11is a vertical axis chromatic aberration diagram of the optical imaging lens assembly in the second embodiment of the present application;

[0033] Fig.12 is a schematic structural diagram of an optical imaging lens assembly provided in Embodiment 3 of the present application;

[0034] Fig.13 is an MTF curve diagram of the optical imaging lens assembly in the third embodiment of the present application;

[0035] Fig.14 is a field curvature distortion curve diagram of the optical imaging lens assembly in the third embodiment of the present application;

[0036] Fig.15 is a vertical axis chromatic aberration diagram of the optical imaging lens assembly in Example 3 of the present application;

[0037] Fig.16 is a structural schematic diagram of an optical imaging lens assembly provided in Embodiment 4 of the present application;

[0038] Fig.17 is an MTF curve diagram of the optical imaging lens assembly in the fourth embodiment of the present application;

[0039] Fig.18 is a field curvature distortion curve diagram of the optical imaging lens assembly in the fourth embodiment of the present application;

[0040] Fig.19 is a vertical axis chromatic aberration diagram of the optical imaging lens assembly in the fourth embodiment of the present application;

[0041] Fig. 20 is a structural schematic diagram of an optical imaging lens assembly provided in Embodiment 5 of the present application;

[0042] Fig.21 is an MTF curve diagram of the optical imaging lens assembly in Example 5 of the present application;

[0043] Fig. 22 is a field curvature distortion curve diagram of the optical imaging lens assembly in Example 5 of the present application;

[0044] Fig.23 This is a vertical axis chromatic aberration diagram of the optical imaging lens assembly in Example 5 of the present application.

[0045] Icons: 100-processor; 110-laser group; 120-fiber 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 cantilever; 123-mirror group; 124-scanner packaging shell; 125-fixing part; 230-scanning surface; 240-imaging plane. DETAILED DESCRIPTION

[0046] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It should also be noted that, for ease of description, only the parts related to the relevant invention are shown in the accompanying drawings.

[0047] Illustrative Scanning Display System

[0048] For current scanning display imaging, it can be realized by a digital micromirror device (DMD) or a fiber scanning display (FSD) device. Among them, the FSD solution is a new scanning display imaging method, which realizes the scanning output of the image through a fiber scanner. In order to enable those skilled in the art to clearly understand the present application scheme, the brief principle of fiber scanning imaging and the corresponding system are described below.

[0049] like Figure 1a As shown, it is an illustrative scanning display system in this application, which mainly includes:

[0050] The processor 100 , the laser group 110 , the optical fiber scanning module 120 , the transmission optical fiber 130 , the light source modulation circuit 140 , the scanning driving circuit 150 and the beam combining unit 160 .

[0051] The processor 100 may be a graphics processing unit (GPU), a central processing unit (CPU), or other chips or circuits with control functions and image processing functions, which are not specifically limited here.

[0052] 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 includes multiple monochromatic lasers, which emit light beams of different colors. As can be seen from FIG1 , the laser group can specifically use three-color lasers: red (Red, R), green (Green, G), and blue (Blue, B). The light beams emitted by the lasers in the laser group 110 are combined into a laser beam by the beam combining unit 160 and coupled into the transmission optical fiber 130.

[0053] The processor 100 may also control the scanning driving circuit 150 to drive the optical fiber scanner in the optical fiber scanning module 120 to scan, thereby scanning and outputting the light beam transmitted in the transmission optical fiber 130 .

[0054] The light beam output by the optical fiber scanner acts on a certain pixel position on the surface of the medium, and forms a light spot at the pixel position, thereby realizing the scanning of the pixel position. Driven by the optical fiber scanner, the output end of the transmission optical fiber 130 sweeps along a certain scanning trajectory, so that the light beam moves to the corresponding pixel position. In the actual scanning process, the light beam output by the transmission optical fiber 130 will form a light spot with corresponding image information (such as color, grayscale or brightness) at each pixel position. In one frame of time, the light beam traverses each pixel position at a sufficiently high speed to complete the scanning of one frame of image. Due to the characteristic of "visual residual" when the human eye observes things, the human eye cannot perceive the movement of the light beam at each pixel position, but sees a complete frame of image.

[0055] Continue to refer Figure 1b , is a specific structure of the optical fiber scanning module 120, which includes: a scanning actuator 121, an optical fiber cantilever 122, a mirror assembly 123, a scanner package 124 and a fixing member 125. The scanning actuator 121 is fixed in the scanner package 124 by the fixing member 125. The transmission optical fiber 130 extends from the front end of the scanning actuator 121 to form an optical fiber cantilever 122 (also called a scanning optical fiber). When working, the scanning actuator 121 is driven by a scanning driving signal, and its slow axis 121a (also called a first actuating portion) moves along a vertical direction (the vertical direction is parallel to Figure 1a , 1b The Y-axis in the reference coordinate system (in this application, the vertical direction may also be referred to as the first direction) vibrates, and its fast axis 121b (also referred to as the second actuating portion) vibrates along the horizontal direction (the horizontal direction is parallel to Figure 1a , 1b The optical fiber cantilever 122 is driven by the scanning actuator 121 to perform two-dimensional scanning according to a preset trajectory and emit a light beam, and the emitted light beam can be scanned and imaged through the lens group 123. Generally, the structure formed by the scanning actuator 121 and the optical fiber cantilever 122 can be called an optical fiber scanner.

[0056] like Figure 2 As shown, in the embodiment of the present application, the movement trajectory of the light-emitting end of the optical fiber forms a scanning surface 230 through the movement of the fast and slow axes, and is converted into an imaging plane 240 after passing through the corresponding lens group 123 (when imaging on a planar carrier, the image is a plane. It should be noted that in other embodiments of the present application, the image formed after passing through the lens group 123 can correspond to the surface of the imaging carrier, that is, it can change with the shape of the carrier surface, as long as the image is clear).

[0057] In order to facilitate description and enable those skilled in the art to easily understand the solution of the present application, it should be noted that the optical imaging lens assembly (such as Figure 2 The lens group 123 shown in the figure is used as an eyepiece. Through the action of the optical imaging lens group, the scanning surface 230 can be converted into an imaging plane 240 (in actual application, the transmission direction of the light is: from the scanning surface 230 to the imaging plane 240).

[0058] It should be further explained that, in the field of projection, the image corresponding to the imaging end is a plane image, and the corresponding plane image carrier can be a projection screen, a curtain, a ground, a glass surface or a wall, etc. The image corresponding to the light source end is a curved surface image, that is, an arc-shaped scanning surface scanned by a fiber optic scanner or emitted by other image sources; in the usage scenario of the camera field, the optical path is opposite to that in the projection field. The light source end generally corresponds to the object side for collecting image information, and the imaging end generally corresponds to the image side obtained by collecting imaging.

[0059] Optical imaging lens

[0060] Please refer to Figure 3 , Figure 8 , Fig.12 as well as Fig.16 The optical imaging lens group in the embodiment of the present application is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, an aperture, a sixth lens, a seventh lens, an eighth lens and a ninth lens, which are arranged in sequence from the second side to the first side on the same optical axis. The second side corresponds to the curved surface image at the light source end, and the curved surface image is formed by the configuration of the optical fiber scanner; wherein the object side surfaces of the first lens, the eighth lens and the ninth lens are all concave surfaces, the image side surfaces of the first lens, the eighth lens and the ninth lens are all convex surfaces, the object side surfaces of the third lens and the sixth lens are all convex surfaces, the image side surface of the third lens is concave, the image side surface of the sixth lens is concave or convex, the fourth lens and the seventh lens are both biconcave lenses, the fifth lens is a biconvex lens, the object side surface and the image side surface of the second lens are concave and convex respectively, or the second lens is a biconvex lens. In the embodiment of this specification, the object side surface is the side of the lens facing the curved surface image, and the image side surface is the side of the lens away from the curved surface image. The spherical optical imaging lens group using a projection objective lens structure in this embodiment of the present application meets the requirements of large field of view, small distortion, and high resolution while taking into account small size and light weight. In addition, the spherical lens design takes into account the advantages of low cost and rapid verification.

[0061] Furthermore, the focal lengths of the first lens to the ninth lens are respectively negative, positive, positive, negative, positive, positive, negative, negative, negative, and positive. In the embodiment of the present application, by reasonably optimizing the positive and negative focal lengths of the nine coaxial lenses of the optical imaging lens group, the optical power of the system can be reasonably dispersed, the aberrations generated by the lenses can be mitigated, the purpose of correcting multiple aberrations can be achieved, and clear imaging of the image side curved surface can be achieved. It should be noted that, in the present application, the optical axis direction extending from the second side to the first side is the positive direction, and the optical axis direction extending from the first side to the second side is the negative direction.

[0062] Further, the second side corresponds to the curved image at the light source end, the curved image is formed by the configuration of the optical fiber scanner, and the surface of the first lens opposite to the curved image is a concave surface, wherein the ratio of the focal length of the first lens to the total focal length of the optical imaging lens group is between -61.18 and -5.77. It should be noted that the surface of the second side of the optical imaging lens group is a concave surface, that is, the surface of the first lens opposite to the curved image is a concave surface, and the concave surface of the second side and the curved image are oriented in the same direction, so that the lens closest to the curved image can be well adapted to the curved image, which is conducive to receiving light with a large viewing angle, so that information from the curved image can be more fully and comprehensively captured. In addition, by limiting the ratio of the focal length of the first lens to the total focal length of the optical imaging lens group, that is, the focal length value of the first lens in the embodiment of the present application is relatively large, and the corresponding optical focal length is relatively small, so that the optical imaging lens group is not easy to introduce large aberrations during the optical imaging process.

[0063] Furthermore, the fourth lens and the fifth lens are combined to form a cemented lens and form a common intermediate plane, wherein the fifth lens with positive optical power is closer to the first side relative to the fourth lens with negative optical power. The cemented lens is used here mainly to balance the system coma and astigmatism of the optical imaging lens group. In addition, after the light emitted by the curved image is diverged and converged by multiple lenses, the cemented lens formed by the fourth lens and the fifth lens diverges the converged light, which can ensure that the light converges in the same plane, while eliminating spherical aberration and chromatic aberration in the imaging process, ensuring the imaging quality.

[0064] Furthermore, the ratio of the focal length of the fourth lens to the total focal length of the optical imaging lens group is -0.93 to -0.74. Here, the focal length value of the fourth lens is relatively small, and its corresponding optical focal length is relatively large. Although large aberrations will be introduced during the imaging process, the positive optical focal length of the fifth lens is also relatively large, so that the fifth lens of the optical imaging lens group can offset part of the aberrations introduced by the fourth lens during the optical imaging process. The optical focal length value of the fourth lens is relatively large relative to the fifth lens, and it can still produce positive field curvature to match the scanned image surface. In addition, the two opposite surfaces of the third lens and the fourth lens are both concave surfaces, and both concave surfaces can produce positive field curvature, so that the final field curvature value of the optical imaging lens group matches the scanned image surface, and can balance coma and astigmatism.

[0065] Furthermore, the ratio of the focal length of the seventh lens to the total focal length of the optical imaging lens group is -1.09 to -0.81. Here, the focal length of the seventh lens is relatively small, and the corresponding optical power is relatively large, and positive field curvature can be generated during the imaging process to match the scanning image surface. In addition, the edge light height of the seventh lens is relatively low, and it will not have much impact on the optical power of the entire system.

[0066] Furthermore, a partial light beam of the curved image is reflected by the first lens and forms a paraxial focal plane on the second side, and a distance between a surface of the first lens opposite to the curved image and the paraxial focal plane is -5.07 mm to -4.37 mm.

[0067] By setting the image side surface of the first lens of the optical imaging lens group as a surface with a reflective function, most of the light of the image at the light source end can pass through the surface and form a forward projection image surface on the first side through the subsequent optical path. The surface with a reflective function reflects a small amount of light from the image at the light source end and forms a reverse light path image surface (also called a paraxial focal plane) on the second side. In specific applications, the image at the light source end can be feedback-corrected by collecting image information of the reverse light path image surface. The optical imaging lens group provided by the embodiment of the present application only needs to set the image side surface of the first lens as a surface with a reflective function, and realizes the reflective imaging of the reverse light path without affecting the quality of the forward projection imaging, and there is no need to set up additional light branch imaging on the optical path or collect the image projected by the optical imaging lens group through a camera, so that the overall volume and mass of the optical imaging lens group and the scanning display device are small, and the structure is simple, which is convenient for subsequent production and reduces the production cost of the optical imaging lens group. When the distance between the reverse light path image plane and the object side surface of the first lens in the optical imaging lens group is too small, the image contrast of the reverse light path image plane will be very small, the clarity will be low, and it will be difficult to distinguish the bright details and dark details of the image of the reverse light path image plane. Accordingly, when the optical imaging lens group is applied to a scanning display device, when the distance between the reverse light path image plane and the object side surface of the first lens in the optical imaging lens group is too large, the distance between the sensor used to collect image information of the reverse light path image plane in the scanning display device and the object plane will also be very large, which will cause the volume of the scanner package shell of the scanning display device to be larger, thus violating the original design intention of miniaturization and lightweight of the scanning display device. Based on the above problems, in some embodiments of the present application, the distance between the paraxial focal plane and the object side surface of the first lens in the optical imaging lens group on the optical axis (such as Figure 3 The t shown b ) is -5.07mm~-4.37mm, so that when the optical imaging lens group is applied to the scanning display device, the overall volume and mass of the scanning display device are small, and at the same time, the quality of the image on the reverse optical path image plane is high, especially the image on the reverse optical path image plane has a large contrast, so as to facilitate the subsequent image information collection and feedback correction work.

[0068] Furthermore, in a possible implementation manner, the multiple lenses may be connected in an interval manner or bonded together in an adhesive manner, which will be determined according to the needs of the actual application and is not limited here.

[0069] Further optionally, in a possible implementation, multiple lenses are made of plastic or glass. It should be noted that lenses made of plastic can effectively reduce production costs. Compared with glass materials, the cost of plastic lenses is one twentieth to one tenth of the cost of glass, so it is very conducive to low-cost mass production; in addition, plastic lenses can usually be injection molded, which has low processing difficulty and can be easily processed into various surface structures that meet aspheric surfaces. At the same time, plastic materials can also reduce the weight of the lens as a whole, which is conducive to its lightweight product design. When using glass materials, the refractive index of glass materials is higher and wider, and it has advantages in correcting lens aberrations; the expansion coefficient of glass materials is much smaller, which is conducive to precision assembly. In addition, due to the characteristics of glass itself such as high temperature resistance, UV resistance, and acid and alkali resistance, the service life and performance stability of the lens group have strong advantages. Of course, it should be emphasized that in other embodiments of the present application, it is not limited to the two materials of plastic and glass provided in the embodiments of the present application, and it can also be other materials that can make lenses.

[0070] Embodiment 1

[0071] Figure 3 The structure diagram of an optical imaging lens assembly provided in Example 1. The optical imaging lens assembly includes nine lenses arranged in sequence along the optical axis, namely, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a stop S9, a sixth lens L6, a seventh lens L7, an eighth lens L8 and a ninth lens L9 arranged in sequence from the second side to the first side on the same optical axis, wherein the focal lengths corresponding to the first lens L1 to the ninth lens L9 are negative, positive, positive, negative, positive, positive, negative, negative, positive, respectively. Further, the object-side surface S18 of the first lens L1, the object-side surface S4 of the eighth lens L8, and the object-side surface S2 of the ninth lens L9 are all concave surfaces, the image-side surface S17 of the first lens L1, the image-side surface S3 of the eighth lens L8, and the image-side surface S1 of the ninth lens L9 are all convex surfaces; the object-side surface S14 of the third lens L3 and the object-side surface S8 of the sixth lens L6 are all convex surfaces, the image-side surface S13 of the third lens L3 is a concave surface, the image-side surface S7 of the sixth lens L6 is a concave surface, the fourth lens L4 and the seventh lens L7 are both biconcave lenses, the fifth lens L5 is a biconvex lens, and the object-side surface S16 and the image-side surface S15 of the second lens L2 are concave and convex surfaces, respectively. It should be noted that, Figure 3 The lens types and shapes of the optical imaging lens group shown are only described as examples, and the shapes of the object-side surfaces or the image-facing surfaces of each lens are not limited to the above contents. For example, in some alternative embodiments, the image-side surface S7 of the sixth lens L6 can also be a convex surface, the second lens L2 can also be a biconvex lens, and the image-side surface of the third lens L3 can also be a flat surface or a convex surface.

[0072] Furthermore, the second side of the optical imaging lens assembly of this embodiment corresponds to the curved image at the light source end, the lens numerical aperture (NA) of the optical imaging lens assembly is 0.28 mm, the total focal length is 1.56 mm, the working distance is 0.37 mm, and the full field angle is 40 degrees. It should be noted that the working distance in the embodiment of this specification refers to the distance between the concave surface of the second side of the optical mirror assembly (i.e., the object side surface of the first lens) and the curved image on the optical axis.

[0073] In this embodiment, the relationship between the focal length of each lens and the total focal length of the lens is shown in Table 1:

[0074] Table 1 Parameter table of the relationship between the focal length of each lens and the total focal length of the lens in this embodiment

[0075]

[0076] Furthermore, in the embodiments of this specification, the preferred parameters of the curvature radius, thickness parameter, refractive index and Abbe number of each lens of the optical imaging lens assembly for imaging the curved surface image are shown in Table 2:

[0077] Table 2 Structural parameters of the optical imaging lens assembly in Example 1

[0078]

[0079]

[0080] It should be noted that Table 2 is the detailed structural data of the optical imaging lens assembly of Example 1, wherein the units of the curvature radius, thickness and focal length are all in millimeters, and the order of surfaces S1-18 represents the surfaces from the first side to the second side; the optical surface with a curvature radius of "Infinity" refers to a flat surface.

[0081] Figure 4 Schematic diagram of the optical path of reflection imaging according to some embodiments of the present application. Figure 4 As shown, further, in the first embodiment, by setting the image side surface S17 of the first lens L1 as a surface with a reflective function, most of the light of the curved image at the light source end can pass through the surface with a reflective function and form a forward projection image surface ( Figure 4 The surface with a reflective function reflects a small amount of light from the image at the light source end, and forms a reverse light path image plane on the second side. In specific applications, the image information of the reverse light path image plane can be collected to perform feedback correction on the image at the light source end. In the embodiments of this specification, when the optical imaging lens assembly uses the image side surface S17 of the first lens L1 as a surface with a reflective function to construct a reverse light path image plane while imaging the curved image, the preferred parameters of the curvature radius, thickness parameters, and refractive index of the first lens L1 are shown in Table 3:

[0082] Table 3 Structural parameters of the optical imaging lens assembly in Example 1

[0083] Light path sequence Radius of curvature thickness Refractive Index Surface Image - 0.38 1 S18(Transmission) -1.6 1.09 2.01718 S17 (Reflection) -2.3 -1.09 -2.01718 S18(Transmission) -1.6 tb 1 Reverse optical path image plane infinity - -

[0084] It should be noted that Table 3 is the detailed structural data of the optical imaging lens assembly of Example 1, wherein the radius of curvature and thickness are both in millimeters. The tb in Table 3 represents the distance between the image side surface S18 of the first lens and the paraxial focal plane on the optical axis. According to the data in Table 3 and the light transmission matrix, it can be calculated that tb is -5 mm.

[0085] Furthermore, after testing, when the above optical imaging lens assembly is used to project the image light corresponding to the scanning surface, the optical transfer function curve is as follows: Figure 5 As shown, the field curvature distortion curve is as follows Figure 6 As shown, the vertical axis chromatic aberration curve is as follows Figure 7 As shown; among them, 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 value (percentage) under different field angles, and the vertical axis chromatic aberration curve represents the chromatic aberration size perpendicular to the axial direction.

[0086] Depend on Figure 5-Figure 7 It can be seen from the observation that the optical imaging lens group of the first embodiment has good imaging resolution within the full field of view, and the optical system distortion and chromatic aberration are small, so the optical imaging lens group can clearly image the scanning curved surface image of the fiber scanner, and has good imaging effect. In addition, the image side surface S17 of the first lens L1 is used as a surface with a reflective function, and the light of the forward light path passes through all the lenses of the optical imaging lens group and forms a clear magnified real image on the forward projection image surface; the light of the reverse light path is reflected at the image side surface S17 of the first lens L1, and forms a clear image on the reverse light path image surface, thereby realizing simultaneous imaging at both ends of the optical axis direction.

[0087] It should be noted that, in the embodiment of the present application, the image side surface S17 of the first lens L1 is used as the surface with a reflective function, and in other alternative embodiments, the surfaces of other lenses can also be used as the surfaces with a reflective function to achieve simultaneous imaging at both ends of the optical axis direction. For example, the surface with a reflective function can be the image side surface S15 of the second lens L2, the object side surface S16 of the second lens L2, the image side surface S13 of the third lens L3, the object side surface S14 of the third lens L3, or the surface of other lenses.

[0088] Of course, in practical applications, the optical imaging lens group may also include a display element, a shell, etc. The display element may be disposed on a first side of the optical imaging lens group, and the optical imaging lens group may be installed in the shell, so that a curved surface image formed by scanning an image source (such as a fiber optic scanner) can be imaged on a plane to achieve clear imaging.

[0089] Embodiment 2

[0090] Figure 8 A schematic diagram of the structure of an optical imaging lens assembly provided in Example 2. The optical imaging lens assembly includes nine lenses arranged in sequence along the optical axis, namely, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, an aperture S9, a sixth lens L6, a seventh lens L7, an eighth lens L8 and a ninth lens L9 arranged in sequence along the optical axis from the second side to the first side, wherein the focal lengths corresponding to the first lens L1 to the ninth lens L9 are negative, positive, positive, negative, positive, positive, negative, negative, positive, respectively. Further, the object-side surface S18 of the first lens L1, the object-side surface S4 of the eighth lens L8, and the object-side surface S2 of the ninth lens L9 are all concave surfaces, the image-side surface S17 of the first lens L1, the image-side surface S3 of the eighth lens L8, and the image-side surface S1 of the ninth lens L9 are all convex surfaces; the object-side surface S14 of the third lens L3 and the object-side surface S8 of the sixth lens L6 are all convex surfaces, the image-side surface S13 of the third lens L3 is a concave surface, the image-side surface S7 of the sixth lens L6 is a concave surface, the fourth lens L4 and the seventh lens L7 are both biconcave lenses, the fifth lens L5 is a biconvex lens, and the object-side surface S16 and the image-side surface S15 of the second lens L2 are concave and convex surfaces, respectively. It should be noted that, Figure 3 The lens types and shapes of the optical imaging lens group shown are only described as examples, and the shapes of the object-side surfaces or the image-facing surfaces of each lens are not limited to the above contents. For example, in some alternative embodiments, the image-side surface S7 of the sixth lens L6 can also be a convex surface, the second lens L2 can also be a biconvex lens, and the image-side surface of the third lens L3 can also be a flat surface or a convex surface.

[0091] Furthermore, the second side of the optical imaging lens assembly of this embodiment corresponds to the curved surface image at the light source end, the lens numerical aperture (NA) of the optical imaging lens assembly is 0.287 mm, the total focal length is 1.56 mm, the working distance is 0.418 mm, and the full field of view angle is 40 degrees.

[0092] In this embodiment, the relationship between the focal length of each lens and the total focal length of the lens is shown in Table 4:

[0093] Table 4 Parameter table of the relationship between the focal length of each lens and the total focal length of the lens in this embodiment

[0094]

[0095] Furthermore, in the embodiment of the present application, the preferred parameters of the curvature radius, thickness parameter, refractive index and Abbe number of each lens of the optical imaging lens assembly for imaging the curved surface image are shown in Table 5:

[0096] Table 5 Structural parameters of the optical imaging lens assembly in Example 2

[0097]

[0098]

[0099] It should be noted that Table 5 is the detailed structural data of the optical imaging lens assembly of Example 2, wherein the units of the curvature radius, thickness and focal length are all in millimeters, and the order of surfaces S1-18 represents the surfaces from the first side to the second side; the optical surface with a curvature radius of "Infinity" refers to a flat surface.

[0100] Furthermore, in the second embodiment, by setting the image side surface S17 of the first lens L1 as a surface with a reflective function, most of the light of the curved image at the light source end can pass through the reflective surface and form a forward projection image surface on the first side through the subsequent optical path, and the reflective surface reflects a small amount of light from the image at the light source end and forms a reverse light path image surface on the second side. In specific applications, the image at the light source end can be feedback corrected by collecting image information of the reverse light path image surface. In the embodiments of this specification, when the optical imaging lens assembly uses the image side surface S17 of the first lens L1 as a surface with a reflective function to construct a reverse light path image surface while imaging the curved image, the preferred parameters of the curvature radius, thickness parameter, and refractive index of the first lens L1 are shown in Table 6:

[0101] Table 6 Structural parameters of the optical imaging lens assembly in Example 2

[0102] Light path sequence Radius of curvature thickness Refractive Index Surface Image - 0.418 1 S18(Transmission) -1.38 1.145 2.01718 S17 (Reflection) -2.305 -1.09 -2.01718 S18(Transmission) -1.38 tb 1 Reverse optical path image plane infinity - -

[0103] It should be noted that Table 6 is the detailed structural data of the optical imaging lens assembly of Example 2, wherein the radius of curvature and thickness are both in millimeters. According to the data in Table 6 and the light transmission matrix, tb can be calculated to be -4.37 mm.

[0104] Furthermore, after testing, when the above optical imaging lens assembly is used to project the image light corresponding to the scanning surface, the optical transfer function curve is as follows: Fig. 9 As shown, the field curvature distortion curve is as follows Fig.10 As shown, the vertical axis chromatic aberration curve is as follows Fig.11As shown; among them, 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 value (percentage) under different field angles, and the vertical axis chromatic aberration curve represents the chromatic aberration size perpendicular to the axial direction.

[0105] Depend on Figure 9-11 It can be observed that the optical imaging lens group of the second embodiment has good imaging resolution within the full field of view, and the optical system distortion and chromatic aberration are small, so the optical imaging lens group can clearly image the scanning curved surface image of the fiber scanner, and has good imaging effects. In addition, the image side surface S17 of the first lens L1 is used as a surface with a reflective function, and the light of the forward light path passes through all the lenses of the optical imaging lens group and forms a clear magnified real image on the forward projection image surface; the light of the reverse light path is reflected at the image side surface S17 of the first lens L1, and forms a clear image on the reverse light path image surface, thereby achieving simultaneous imaging at both ends of the optical axis direction.

[0106] It should be noted that, in the embodiment of the present application, the image side surface S17 of the first lens L1 is used as the surface with a reflective function, and in other alternative embodiments, the surfaces of other lenses can also be used as the surfaces with a reflective function to achieve simultaneous imaging at both ends of the optical axis direction. For example, the surface with a reflective function can be the image side surface S15 of the second lens L2, the object side surface S16 of the second lens L2, the image side surface S13 of the third lens L3, the object side surface S14 of the third lens L3, or the surface of other lenses.

[0107] Of course, in practical applications, the optical imaging lens group may also include a display element, a shell, etc. The display element may be disposed on a first side of the optical imaging lens group, and the optical imaging lens group may be installed in the shell, so that a curved surface image formed by scanning an image source (such as a fiber optic scanner) can be imaged on a plane to achieve clear imaging.

[0108] Embodiment 3

[0109] Fig.12A schematic diagram of the structure of an optical imaging lens group provided in Example 3. The optical imaging lens group includes nine lenses arranged in sequence along the optical axis, namely, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, an aperture S9, a sixth lens L6, a seventh lens L7, an eighth lens L8 and a ninth lens L9 arranged in sequence along the optical axis from the second side to the first side, wherein the focal lengths corresponding to the first lens L1 to the ninth lens L9 are negative, positive, positive, negative, positive, positive, negative, negative, positive, respectively. Further, the object-side surface S18 of the first lens L1, the object-side surface S4 of the eighth lens L8, and the object-side surface S2 of the ninth lens L9 are all concave surfaces, the image-side surface S17 of the first lens L1, the image-side surface S3 of the eighth lens L8, and the image-side surface S1 of the ninth lens L9 are all convex surfaces; the object-side surface S14 of the third lens L3 and the object-side surface S8 of the sixth lens L6 are all convex surfaces, the image-side surface S13 of the third lens L3 is a concave surface, the image-side surface S7 of the sixth lens L6 is a concave surface, the fourth lens L4 and the seventh lens L7 are both biconcave lenses, the fifth lens L5 is a biconvex lens, and the object-side surface S16 and the image-side surface S15 of the second lens L2 are concave and convex surfaces, respectively. It should be noted that, Figure 3 The lens types and shapes of the optical imaging lens group shown are only described as examples, and the shapes of the object-side surfaces or the image-facing surfaces of each lens are not limited to the above contents. For example, in some alternative embodiments, the image-side surface S7 of the sixth lens L6 can also be a convex surface, the second lens L2 can also be a biconvex lens, and the image-side surface of the third lens L3 can also be a flat surface or a convex surface.

[0110] Furthermore, the second side of the optical imaging lens assembly of this embodiment corresponds to the curved surface image at the light source end, the lens numerical aperture (NA) of the optical imaging lens assembly is 0.28 mm, the total focal length is 1.59 mm, the working distance is 0.376 mm, and the full field of view angle is 40 degrees.

[0111] In this embodiment, the relationship between the focal length of each lens and the total focal length of the lens is shown in Table 7:

[0112] Table 7 Parameter table of the relationship between the focal length of each lens and the total focal length of the lens in this embodiment

[0113]

[0114]

[0115] Furthermore, in the embodiment of the present application, the preferred parameters of the curvature radius, thickness parameter, refractive index and Abbe number of each lens of the optical imaging lens assembly for imaging the curved surface image are shown in Table 8:

[0116] Table 8 shows the structural parameters of the optical imaging lens assembly in Example 3

[0117]

[0118] It should be noted that Table 8 is the detailed structural data of the optical imaging lens assembly of Example 3, wherein the units of the curvature radius, thickness and focal length are all in millimeters, and the order of surfaces S1-18 represents the surfaces from the first side to the second side; the optical surface with a curvature radius of "Infinity" refers to a flat surface.

[0119] Furthermore, in the third embodiment, by setting the image side surface S17 of the first lens L1 as a surface with a reflective function, most of the light of the curved image at the light source end can pass through the reflective surface and form a forward projection image surface on the first side through the subsequent optical path, and the reflective surface reflects a small amount of light from the image at the light source end and forms a reverse light path image surface on the second side. In specific applications, the image at the light source end can be feedback corrected by collecting image information of the reverse light path image surface. In the embodiments of this specification, when the optical imaging lens assembly uses the image side surface S17 of the first lens L1 as a surface with a reflective function to construct a reverse light path image surface while imaging the curved image, the preferred parameters of the curvature radius, thickness parameter, and refractive index of the first lens L1 are shown in Table 9:

[0120] Table 9 Structural parameters of the optical imaging lens assembly in Example 3

[0121] Light path sequence Radius of curvature thickness Refractive Index Surface Image - 0.376 1 S18(Transmission) -1.76 1.112 2.01718 S17 (Reflection) -2.37 -1.112 -2.01718 S18(Transmission) -1.76 tb 1 Reverse optical path image plane infinity - -

[0122] It should be noted that Table 9 shows the detailed structural data of the optical imaging lens assembly of Example 3, wherein the radius of curvature and thickness are both in millimeters. According to the data in Table 9 and the light transmission matrix, tb can be calculated to be -5.07 mm.

[0123] Furthermore, after testing, when the above optical imaging lens assembly is used to project the image light corresponding to the scanning surface, the optical transfer function curve is as follows: Fig.13 As shown, the field curvature distortion curve is as follows Fig.14 As shown, the vertical axis chromatic aberration curve is as follows Fig.15 As shown; among them, 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 value (percentage) under different field angles, and the vertical axis chromatic aberration curve represents the chromatic aberration size perpendicular to the axial direction.

[0124] Depend on Figure 13-Figure 15It can be seen from the observation that the optical imaging lens group of the third embodiment has good imaging resolution within the full field of view, and the optical system distortion and chromatic aberration are small, so the optical imaging lens group can clearly image the scanning curved surface image of the fiber scanner, and has good imaging effect. In addition, the image side surface S17 of the first lens L1 is used as a surface with a reflective function, and the light of the forward light path passes through all the lenses of the optical imaging lens group and forms a clear magnified real image on the forward projection image surface; the light of the reverse light path is reflected at the image side surface S17 of the first lens L1, and forms a clear image on the reverse light path image surface, thereby realizing simultaneous imaging at both ends of the optical axis direction.

[0125] It should be noted that, in the embodiment of the present application, the image side surface S17 of the first lens L1 is used as the surface with a reflective function, and in other alternative embodiments, the surfaces of other lenses can also be used as the surfaces with a reflective function to achieve simultaneous imaging at both ends of the optical axis direction. For example, the surface with a reflective function can be the image side surface S15 of the second lens L2, the object side surface S16 of the second lens L2, the image side surface S13 of the third lens L3, the object side surface S14 of the third lens L3, or the surface of other lenses.

[0126] Of course, in practical applications, the optical imaging lens group may also include a display element, a shell, etc. The display element may be disposed on a first side of the optical imaging lens group, and the optical imaging lens group may be installed in the shell, so that a curved surface image formed by scanning an image source (such as a fiber optic scanner) may be imaged on a plane to achieve clear imaging.

[0127] Embodiment 4

[0128] Fig.16A schematic diagram of the structure of an optical imaging lens group provided for Example 4. The optical imaging lens group includes nine lenses arranged in sequence along the optical axis, namely, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, an aperture S9, a sixth lens L6, a seventh lens L7, an eighth lens L8 and a ninth lens L9 arranged in sequence along the optical axis from the second side to the first side, wherein the focal lengths corresponding to the first lens L1 to the ninth lens L9 are negative, positive, positive, negative, positive, positive, negative, negative, positive, respectively. Further, the object-side surface S18 of the first lens L1, the object-side surface S4 of the eighth lens L8, and the object-side surface S2 of the ninth lens L9 are all concave surfaces, the image-side surface S17 of the first lens L1, the image-side surface S3 of the eighth lens L8, and the image-side surface S1 of the ninth lens L9 are all convex surfaces; the object-side surface S14 of the third lens L3 and the object-side surface S8 of the sixth lens L6 are all convex surfaces, the image-side surface S13 of the third lens L3 is a concave surface, the image-side surface S7 of the sixth lens L6 is a concave surface, the fourth lens L4 and the seventh lens L7 are both biconcave lenses, the fifth lens L5 is a biconvex lens, and the object-side surface S16 and the image-side surface S15 of the second lens L2 are concave and convex surfaces, respectively. It should be noted that, Figure 3 The lens types and shapes of the optical imaging lens group shown are only described as examples, and the shapes of the object-side surfaces or the image-facing surfaces of each lens are not limited to the above contents. For example, in some alternative embodiments, the image-side surface S7 of the sixth lens L6 can also be a convex surface, the second lens L2 can also be a biconvex lens, and the image-side surface of the third lens L3 can also be a flat surface or a convex surface.

[0129] Furthermore, the second side of the optical imaging lens assembly of this embodiment corresponds to the curved surface image at the light source end, the lens numerical aperture (NA) of the optical imaging lens assembly is 0.29 mm, the total focal length is 1.56 mm, the working distance is 0.418 mm, and the full field of view angle is 40 degrees.

[0130] In this embodiment, the relationship between the focal length of each lens and the total focal length of the lens is shown in Table 10:

[0131] Table 10 Parameter table of the relationship between the focal length of each lens and the total focal length of the lens in this embodiment

[0132]

[0133] Furthermore, in the embodiment of the present application, the preferred parameters of the curvature radius, thickness parameter, refractive index and Abbe number of each lens of the optical imaging lens assembly for imaging the curved surface image are shown in Table 11:

[0134] Table 11 Structural parameters of the optical imaging lens assembly in Example 4

[0135]

[0136]

[0137] It should be noted that Table 11 is the detailed structural data of the optical imaging lens assembly of Example 4, wherein the units of the curvature radius, thickness and focal length are all in millimeters, and the order of surfaces S1-18 represents the surfaces from the first side to the second side; the optical surface with a curvature radius of "Infinity" refers to a flat surface.

[0138] Furthermore, in Example 4, the image-side surface S17 of the first lens L1 is not set as a surface with a reflective function, and the preferred parameters of the curvature radius, thickness parameter, and refractive index of the first lens L1 are shown in Table 12:

[0139] Table 12 Structural parameters of the optical imaging lens assembly in Example 4

[0140] Light path sequence Radius of curvature thickness Refractive Index Surface Image - 0.415 1 S18(Transmission) -1.41 1.553 2.01718 S17 (Reflection) -2.3 -1.553 -2.01718 S18(Transmission) -1.41 tb 1 Reverse optical path image plane infinity - -

[0141] It should be noted that Table 12 is the detailed structural data of the optical imaging lens assembly of Example 4, wherein the radius of curvature and thickness are both in millimeters. According to the data in Table 12 and the light transmission matrix, it can be calculated that tb is -0.6 mm, at which time the image side surface S17 of the first lens L1 cannot effectively reflect the light from the curved surface image and generate a reverse light path image.

[0142] Furthermore, after testing, when the above optical imaging lens assembly is used to project the image light corresponding to the scanning surface, the optical transfer function curve is as follows: Fig.17 As shown, the field curvature distortion curve is as follows Fig.18 As shown, the vertical axis chromatic aberration curve is as follows Fig.19 As shown; among them, 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 value (percentage) under different field angles, and the vertical axis chromatic aberration curve represents the chromatic aberration size perpendicular to the axial direction.

[0143] Depend on Figure 17-Figure 19 It can be observed that the optical imaging lens assembly of Example 4 has good imaging resolution in the full field of view, and small optical system distortion and chromatic aberration. Therefore, the optical imaging lens assembly can clearly image the scanned curved surface image of the optical fiber scanner and has good imaging effect.

[0144] Of course, in practical applications, the optical imaging lens group may also include a display element, a shell, etc. The display element may be disposed on a first side of the optical imaging lens group, and the optical imaging lens group may be installed in the shell, so that a curved surface image formed by scanning an image source (such as a fiber optic scanner) may be imaged on a plane to achieve clear imaging.

[0145] Embodiment 5

[0146] Fig. 20 A schematic diagram of the structure of an optical imaging lens group provided in Example 5. The optical imaging lens group includes nine lenses arranged in sequence along the optical axis, namely, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, an aperture S9, a sixth lens L6, a seventh lens L7, an eighth lens L8 and a ninth lens L9 arranged in sequence along the optical axis from the second side to the first side, wherein the focal lengths corresponding to the first lens L1 to the ninth lens L9 are negative, positive, positive, negative, positive, positive, negative, negative, positive, respectively. Further, the object-side surface S18 of the first lens L1, the object-side surface S4 of the eighth lens L8 and the object-side surface S2 of the ninth lens L9 are all concave surfaces, the image-side surface S17 of the first lens L1, the image-side surface S3 of the eighth lens L8 and the image-side surface S1 of the ninth lens L9 are all convex surfaces; the object-side surface S14 of the third lens L3 and the object-side surface S8 of the sixth lens L6 are all convex surfaces, the image-side surface S13 of the third lens L3 is a plane, the image-side surface S7 of the sixth lens L6 is a concave surface, the fourth lens L4 and the seventh lens L7 are both biconcave lenses, the fifth lens L5 is a biconvex lens, and the object-side surface S16 and the image-side surface S15 of the second lens L2 are concave and convex surfaces, respectively. It should be noted that, Figure 3 The lens types and shapes of the optical imaging lens group shown are only described as examples, and the shapes of the object-side or image-facing side surfaces of each lens are not limited to the above contents. For example, in some alternative embodiments, the image-side surface S7 of the sixth lens L6 can also be a concave surface, the second lens L2 can also be a biconvex lens, and the image-side surface of the third lens L3 can also be a concave surface or a convex surface.

[0147] Furthermore, the second side of the optical imaging lens assembly of this embodiment corresponds to the curved image at the light source end, the lens numerical aperture (NA) of the optical imaging lens assembly is 0.28 mm, the total focal length is 1.56 mm, the working distance is 0.319 mm, and the full field of view angle is 40 degrees.

[0148] In this embodiment, the relationship between the focal length of each lens and the total focal length of the lens is shown in Table 13:

[0149] Table 13 Parameter table of the relationship between the focal length of each lens and the total focal length of the lens in this embodiment

[0150]

[0151] Furthermore, in the embodiment of the present application, the preferred parameters of the curvature radius, thickness parameter, refractive index and Abbe number of each lens of the optical imaging lens assembly for imaging the curved surface image are shown in Table 14:

[0152] Table 14 Structural parameters of the optical imaging lens assembly in Example 4

[0153]

[0154]

[0155] It should be noted that Table 14 is the detailed structural data of the optical imaging lens assembly of Example 5, wherein the units of the curvature radius, thickness and focal length are all in millimeters, and the order of surfaces S1-18 represents the surfaces from the first side to the second side; the optical surface with a curvature radius of "Infinity" refers to a flat surface.

[0156] Furthermore, in Example 5, the image-side surface S17 of the first lens L1 is not set as a surface with a reflective function, and the preferred parameters of the curvature radius, thickness parameter, and refractive index of the first lens L1 are shown in Table 15:

[0157] Table 15 Structural parameters of the optical imaging lens assembly in Example 5

[0158] Light path sequence Radius of curvature thickness Refractive Index Surface Image - 0.32 1 S18(Transmission) -1.514 1.211 1.9537 S17 (Reflection) -2.31 -1.211 -1.9537 S18(Transmission) -1.514 tb 1 Reverse optical path image plane infinity - -

[0159] It should be noted that Table 12 is the detailed structural data of the optical imaging lens assembly of Example 5, wherein the radius of curvature and thickness are both in millimeters. According to the data in Table 12 and the light transmission matrix, tb can be calculated to be -5.75 mm.

[0160] Furthermore, after testing, when the above optical imaging lens assembly is used to project the image light corresponding to the scanning surface, the optical transfer function curve is as follows: Fig.21 As shown, the field curvature distortion curve is as follows Fig. 22 As shown, the vertical axis chromatic aberration curve is as follows Fig.23 As shown; among them, 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 value (percentage) under different field angles, and the vertical axis chromatic aberration curve represents the chromatic aberration size perpendicular to the axial direction.

[0161] Depend on Figure 21-23It can be seen from the observation that the optical imaging lens group of the fourth embodiment has good imaging resolution within the full field of view, and the optical system distortion and chromatic aberration are small, so the optical imaging lens group can clearly image the scanning curved surface image of the fiber scanner, and has good imaging effect. In addition, the image side surface S17 of the first lens L1 is used as a surface with a reflective function, and the light of the forward light path passes through all the lenses of the optical imaging lens group and forms a clear magnified real image on the forward projection image surface; the light of the reverse light path is reflected at the image side surface S17 of the first lens L1, and forms a clear image on the reverse light path image surface, thereby realizing simultaneous imaging at both ends of the optical axis direction.

[0162] Of course, in practical applications, the optical imaging lens group may also include a display element, a shell, etc. The display element may be disposed on a first side of the optical imaging lens group, and the optical imaging lens group may be installed in the shell, so that a curved surface image formed by scanning an image source (such as a fiber optic scanner) may be imaged on a plane to achieve clear imaging.

[0163] Scanning display device

[0164] The aforementioned optical imaging lens assembly can be used in conjunction with a fiber scanner (or a corresponding fiber scanning module) to form a scanning display device (such as Figure 1a , 1b As shown, the optical imaging lens group is arranged on the light output path of the optical fiber scanner), wherein the second side of the optical imaging lens group faces the light output direction of the optical fiber scanner. The preferred method is that the optical imaging lens group is coaxial with the central optical axis of the optical fiber scanner. Of course, the structure and general principle of the optical fiber scanner can be referred to the aforementioned Figure 1a , 1b The corresponding content will not be elaborated here.

[0165] In addition, in a possible implementation, the present application also provides an application of the above-mentioned scanning display device, that is, the above-mentioned scanning display device is configured in the projection field, specifically configured and applied in vehicle-mounted projection. It can not only be configured in relevant positions in the vehicle such as on the external body or head-up display, but it can also be configured in the vehicle for projection display, and it can be flexibly set according to the display requirements of the vehicle-mounted projection.

[0166] In some embodiments, the scanning display device can be applied to vehicles, including but not limited to automobiles, motorcycles, electric bicycles, balance vehicles, scooters, etc. In some embodiments, the vehicle-mounted projection system can also be used in other tools with transportation capabilities, such as aircraft, ships, wheelchairs, etc. Taking a car as a specific example, the optical imaging module of the scanning display device can be set at the door, front or rear of the car to project the image onto the ground around the car body. It should be noted that the image corresponding to the imaging end is a plane image, and the corresponding plane image carrier can be, for example, a projection screen, a curtain, the ground or a glass surface. It should be noted that in the specific application of the scanning display device, the number of scanning display devices can be one or more groups. When the scanning display device is located at different positions of the carrier (for example, a vehicle), the specifications of the fiber optic scanner, the distribution of each lens in the optical imaging lens group, the parameters, etc. can be adaptively adjusted according to the specific scene.

[0167] In summary, the spherical optical imaging lens group using a projection objective lens structure in the embodiment of the present application meets the requirements of large field of view, small distortion, and high resolution while taking into account small size and light weight; the spherical lens design takes into account the advantages of low cost and rapid verification; by setting one surface of the lens in the optical imaging lens group to a surface with a reflective function, most of the light of the image at the light source end can pass through the surface with a reflective function and form a forward projection image plane on the first side through the subsequent optical path, and the surface with a reflective function reflects a small amount of light from the image at the light source end and forms a reverse light path image plane on the second side. In specific applications, the image at the light source end can be feedback corrected by collecting image information of the reverse light path image plane; by configuring the above-mentioned optical imaging lens group in a fiber scanner, a miniaturized and lightweight scanning display device is formed, and the scanning display device is configured and applied in the field of vehicle-mounted projection, which can meet the requirements of large viewing angle, high resolution and low distortion of vehicle-mounted projection.

[0168] The above are only preferred specific embodiments of the present application. Each embodiment is only used to illustrate the technical solution of the present application but not to limit the present application. Any technical solution that can be obtained by technical personnel in this field through logical analysis, reasoning or effective experiments based on the concept of the present application should be within the scope of the present application.

[0169] The various embodiments in the present application are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0170] The expressions "first", "second", "the first" or "the second" used in various embodiments of the present disclosure may 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 an element from other elements.

Claims

1. An optical imaging lens assembly, characterized in that: The optical imaging lens assembly comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, an aperture, a sixth lens, a seventh lens, an eighth lens and a ninth lens which are sequentially arranged on a common optical axis from the second side to the first side, wherein the second side corresponds to a curved surface image at the light source end, and the curved surface image is formed by a fiber scanner; Among them, the object side surfaces of the first lens, the eighth lens and the ninth lens are all concave surfaces, the image side surfaces of the first lens, the eighth lens and the ninth lens are all convex surfaces, the object side surfaces of the third lens and the sixth lens are all convex surfaces, the image side surface of the sixth lens is concave or convex, the fourth lens and the seventh lens are both biconcave lenses, the fifth lens is a biconvex lens, the object side surface and the image side surface of the second lens are concave and convex surfaces respectively, or the second lens is a biconvex lens.

2. The optical imaging lens assembly according to claim 1, characterized in that: The optical powers corresponding to the first lens to the ninth lens are negative, positive, positive, negative, positive, positive, positive, negative, negative, and positive, respectively.

3. The optical imaging lens assembly according to claim 2, characterized in that: The ratio of the focal length of the first lens to the total focal length of the optical imaging lens assembly is in the range of -61.18 to -5.

77.

4. The optical imaging lens assembly according to claim 2, characterized in that: The fourth lens and the fifth lens are combined to form a cemented lens and form a common intermediate surface.

5. The optical imaging lens assembly according to claim 4, characterized in that: The ratio of the focal length of the fourth lens to the total focal length of the optical imaging lens assembly is in the range of -0.93 to -0.

74.

6. The optical imaging lens assembly according to claim 2, characterized in that: The ratio of the focal length of the seventh lens to the total focal length of the optical imaging lens assembly is in the range of -1.09 to -0.

81.

7. The optical imaging lens assembly according to any one of claims 1 to 6, characterized in that: A partial light beam of the curved image is at least reflected by the first lens and forms a paraxial focal plane on the second side, and a distance between the object side surface of the first lens and the paraxial focal plane on the optical axis is in the range of -5.07 mm to -4.37 mm.

8. A scanning display device, characterized in that: A method of manufacturing a fiber optic scanner comprising an optical fiber scanner and an optical imaging lens assembly as described in any one of claims 1 to 7, wherein the optical fiber scanner is used to scan and emit light of an image to be displayed, and the optical imaging lens assembly is used to magnify and project a scanning surface corresponding to the light emitted by the optical fiber scanner; The optical fiber scanner includes an actuator and an optical fiber fixed on the actuator. The portion of the optical fiber that exceeds the actuator forms an optical fiber cantilever. The optical fiber cantilever performs two-dimensional scanning under the drive of the actuator.

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