Optical imaging lens assembly, scanning display device and near-eye display device

Abstract

The present application discloses an optical imaging lens assembly, a scanning display device, and a near-eye display device, which relate to the field of scanning display technology. The optical imaging lens assembly, by rationally optimizing the focal lengths of the five coaxial lenses of the optical imaging lens assembly, can reasonably disperse the optical power of the system, mitigate the aberrations generated by the lenses, and achieve the purpose of correcting multiple aberrations, thereby achieving clear imaging of the image side curved surface while improving the field of view angle. By limiting and optimizing the refractive index, dispersion coefficient, and surface structure of the five coaxial lenses, the field of view angle and imaging quality are further improved. By limiting and optimizing the design of the five coaxial lenses into an aspheric surface structure, the imaging quality is further improved, and the overall structure of the optical imaging lens assembly can be made more compact, meeting the production requirements of miniaturized lens products.

Description

Technical Field

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

[0002] 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 have disadvantages such as high processing difficulty, high mass production cost, poor imaging quality, small field of view angle, and inability to be miniaturized. As a result, scanning display imaging technology is subject to certain restrictions during market promotion and application. In particular, when scanning display imaging is applied to near-eye display scenarios, it is limited by the imaging effect and field of view angle, and has not been able to meet the high-resolution performance requirements of near-eye display, thus hindering the development of near-eye display into the consumer market. Summary of the Invention

[0004] The purpose of this application is to provide an optical imaging lens assembly, a scanning display device and a near-eye display device to meet the requirements of large field of view, high imaging quality and miniaturization in near-eye display scenarios.

[0005] An embodiment of the present application provides an optical imaging lens assembly, which includes at least a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, which are arranged on a common optical axis in sequence from a first side to a second side, wherein the focal lengths of the first lens to the fifth lens are positive, negative, positive, negative, and positive, respectively.

[0006] Optionally, -1.38≤f2 / f≤-0.7, -1.29≤f4 / f≤-0.5, wherein f2 is the focal length of the second lens, f4 is the focal length of the fourth lens, and f is the focal length of the optical imaging lens assembly;

[0007] The second side surface of the fifth lens is concave at the near optical axis.

[0008] Optionally, each of the lenses further satisfies the following relationships: 6.22≤f1 / f≤23.99, 0.39≤f3 / f≤0.52, and 0.5≤f5 / f≤1.62; wherein f1 is the focal length of the first lens, f3 is the focal length of the third lens, f5 is the focal length of the fifth lens, and f is the focal length of the optical imaging lens assembly;

[0009] Each of the lenses further satisfies the following relationship: 1.55≤n1≤1.61, 1.73≤n2≤1.76, 1.49≤n3≤1.5, 1.62≤n4≤1.76, 1.62≤n5≤1.65; wherein n1 is the refractive index of the first lens, n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, n4 is the refractive index of the fourth lens, and n5 is the refractive index of the fifth lens;

[0010] The dispersion coefficients of the various lenses satisfy: 41.7≤v1≤62.4, 27.6≤v2≤36, 69.4≤v3≤70.4, 27.6≤v4≤36.7, 55.8≤v5≤60.3; wherein v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, v3 is the Abbe number of the third lens, v4 is the Abbe number of the fourth lens, and v5 is the Abbe number of the fifth lens.

[0011] Optionally, the n1 is 1.55 or 1.57 or 1.61 or 1.63, the n2 is 1.73 or 1.75 or 1.76, the n3 is 1.49 or 1.5, the n4 is 1.62 or 1.76, and the n5 is 1.62 or 1.63 or 1.65;

[0012] The Abbe number of each lens satisfies: the Abbe number of the first lens is 41.7 or 49 or 49.9 or 62.4, the Abbe number of the second lens is 27.6 or 30.3 or 36, the Abbe number of the third lens is 69.4 or 70.4, the Abbe number of the fourth lens is 27.6 or 36.7, and the Abbe number of the fifth lens is 55.8 or 58 or 60.3.

[0013] Optionally, the first side surface of the fifth lens is convex, and the second side surface of the fifth lens is convex at the far optical axis; the first side surface of the fourth lens is concave, and the second side surface of the fourth lens is convex.

[0014] Optionally, the first side surface of the first lens is a convex surface, and the second side surface of the first lens is a concave surface or a convex surface.

[0015] Optionally, the first side surface of the second lens is convex, and the second side surface of the second lens is concave; the first side surface and the second side surface of the third lens are both convex;

[0016] The first side surface and the second side surface of the first lens to the fifth lens are all aspherical structures;

[0017] The second side of the optical imaging lens assembly corresponds to a curved image, and the first side of the optical imaging lens assembly corresponds to a flat image.

[0018] The present application also provides a scanning display device in an embodiment, which includes a fiber scanner and the aforementioned optical imaging lens assembly, wherein the 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 fiber scanner;

[0019] The fiber scanner includes an actuator and an optical fiber fixed on the actuator. The portion of the optical fiber extending beyond the actuator forms an optical fiber cantilever. The optical fiber cantilever performs two-dimensional scanning under the drive of the actuator.

[0020] A near-eye display device is also provided in an embodiment of the present application. The near-eye display device is used as a head-mounted augmented reality device, and at least includes a near-eye display module and a scanning display device according to the above-mentioned method, and the scanning display device is arranged in the near-eye display module.

[0021] A near-eye display device is also provided in an embodiment of the present application. The near-eye display device is used as a head-mounted virtual reality device, and at least includes a near-eye display module and the scanning display device according to the above-mentioned method, and the scanning display device is arranged in the near-eye display module.

[0022] The following technical effects can be achieved by using the technical solutions in the embodiments of this application:

[0023] In the embodiment of the present application, by reasonably optimizing the focal lengths of the five 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, and the purpose of correcting multiple aberrations can be achieved, thereby achieving clear imaging of the image side curved surface on the basis of improving the field of view; at the same time, the overall structure of the optical imaging lens group is made more compact by configuring a reasonable number of lens combinations, meeting the production requirements of miniaturization of lens products.

[0024] Furthermore, by limiting and optimizing the refractive index, dispersion coefficient and surface structure of the five coaxial lenses, the field of view and imaging quality are further improved.

[0025] Other features and advantages of the present application will be described in the following description and, in part, will become apparent from the description or be understood through implementation of the technical solutions of the present application. The objectives and other advantages of the present application can be achieved and obtained through the structures and / or processes specifically pointed out in the description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0027] Figure 1a、 1b is a schematic structural diagram of an illustrative scanning display system;

[0028] Figure 2a is a schematic diagram of the scanning output of the optical fiber scanner provided in an embodiment of the present application;

[0029] Figure 2b Schematic diagram of the positional relationship between the optical imaging lens assembly provided by an embodiment of the present application and the entrance pupil position, exit pupil position, and corresponding exit pupil distance;

[0030] Figure 3 This is a schematic structural diagram of an optical imaging lens assembly provided in Example 1 of the present application;

[0031] Figure 4 is an MTF curve diagram of the optical imaging lens assembly in Example 1 of the present application;

[0032] Figure 5 is a field curvature distortion curve diagram of the optical imaging lens assembly in Example 1 of the present application;

[0033] Figure 6 2 is a diagram of vertical axis chromatic aberration of the optical imaging lens assembly in Example 1 of the present application.

[0034] Figure 7 This is a schematic structural diagram of an optical imaging lens assembly provided in Example 2 of the present application;

[0035] Figure 8 is an MTF curve diagram of the optical imaging lens assembly in Example 2 of the present application;

[0036] Figure 9 is a field curvature distortion curve diagram of the optical imaging lens assembly in Example 2 of the present application;

[0037] Figure 10 is a diagram of vertical axis chromatic aberration of the optical imaging lens assembly in Example 2 of the present application;

[0038] Figure 11 This is a schematic structural diagram of an optical imaging lens assembly provided in Example 3 of the present application;

[0039] Figure 12 is an MTF curve diagram of the optical imaging lens assembly in Example 3 of the present application;

[0040] Figure 13 is a field curvature distortion curve diagram of the optical imaging lens assembly in Example 3 of the present application;

[0041] Figure 14 is a diagram of vertical axis chromatic aberration of the optical imaging lens assembly in Example 3 of the present application;

[0042] Figure 15 This is a schematic structural diagram of an optical imaging lens assembly provided in Example 4 of the present application;

[0043] Figure 16 is an MTF curve diagram of the optical imaging lens assembly in Example 4 of the present application;

[0044] Figure 17 is a field curvature distortion curve diagram of the optical imaging lens assembly in Example 4 of the present application;

[0045] Figure 18 is a diagram of vertical axis chromatic aberration of the optical imaging lens assembly in Example 4 of the present application;

[0046] Figure 19 This is a schematic structural diagram of an optical imaging lens assembly provided in Example 5 of the present application;

[0047] Figure 20 is an MTF curve diagram of the optical imaging lens assembly in Example 5 of the present application;

[0048] Figure 21 is a field curvature distortion curve diagram of the optical imaging lens assembly in Example 5 of the present application;

[0049] Figure 22 This is a diagram of vertical axis chromatic aberration of the optical imaging lens assembly in Example 5 of the present application.

[0050] 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 package; 125-fixing part; 230-scanning surface; 240-imaging plane; 11-first lens; 12-second lens; 13-third lens; 14-fourth lens; 15-fifth lens; 01-aperture; 02-scanning surface; 31-first lens; 32 -Second lens; 33-Third lens; 34-Fourth lens; 35-Fifth lens; 03-Aperture; 04-Scanning surface; 51-First lens; 52-Second lens; 53-Third lens; 54-Fourth lens; 55-Fifth lens; 05-Aperture; 06-Scanning surface; 71-First lens; 72-Second lens; 73-Third lens; 74-Fourth lens; 75-Fifth lens; 76-Sixth lens; 07-Aperture; 08-Scanning surface; 91-First lens; 92-Second lens; 93-Third lens; 94-Fourth lens; 95-Fifth lens; 09-Aperture; 10-Scanning surface. DETAILED DESCRIPTION

[0051] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant invention and are not intended to limit the invention. It should also be noted that, for ease of description, only portions relevant to the relevant invention are shown in the accompanying drawings.

[0052] Illustrative Scanning Display System

[0053] Current scanning display imaging can be achieved using a digital micromirror device (DMD) or a fiber scanning display (FSD). The FSD solution, a novel scanning display imaging method, uses a fiber scanner to scan and output images. To help those skilled in the art clearly understand the present invention, the following briefly describes the principles and corresponding systems of fiber scanning imaging.

[0054] like Figure 1a FIG. 1 is an illustrative scanning display system in the present application, which mainly includes:

[0055] Processor 100, laser group 110, fiber scanning module 120, transmission fiber 130, light source modulation circuit 140, scanning drive circuit 150 and beam combining unit 160.

[0056] 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.

[0057] During system operation, the processor 100 controls the light source modulation circuit 140 to modulate the laser array 110 based on the image data to be displayed. Laser array 110 includes multiple monochromatic lasers, each emitting a different color beam. As shown in Figure 1 , the laser array can specifically employ three lasers: red (R), green (G), and blue (B). The beams emitted by the lasers in laser array 110 are combined into a single laser beam by a beam combining unit 160 and coupled into the transmission fiber 130.

[0058] 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 .

[0059] 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. During 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 "visual residual" characteristic of the human eye when observing things, the human eye cannot perceive the movement of the light beam at each pixel position, but sees a complete frame of image.

[0060] Continue to refer Figure 1b , is the specific structure of the fiber scanning module 120, which includes: a scanning actuator 121, a fiber cantilever 122, a mirror assembly 123, a scanner package 124, and a fixing member 125. The scanning actuator 121 is fixed to the scanner package 124 by the fixing member 125. The transmission fiber 130 extends from the front end of the scanning actuator 121 to form the fiber cantilever 122 (also called a scanning fiber). When working, the scanning actuator 121 is driven by the scanning drive signal, and its slow axis 121a (also called the first actuator) is moved along the 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 vibrates along the X-axis of the central reference coordinate system (in this application, this horizontal direction may also be referred to as the second direction). Driven by the scanning actuator 121, the front end of the optical fiber cantilever 122 performs a two-dimensional sweep along a predetermined trajectory and emits a light beam. The emitted light beam then passes through the lens assembly 123 to achieve scanning imaging. Generally, the structure formed by the scanning actuator 121 and the optical fiber cantilever 122 is referred to as a fiber scanner.

[0061] like Figure 2a As shown, in the embodiment of the present application, the motion trajectory of the optical fiber's light-emitting end forms a scanning curved surface 230 through the movement of the fast and slow axes. After passing through the corresponding lens assembly 123, it is converted into an imaging plane 240. When applied to a near-eye display device such as an augmented reality (AR) device, the imaging plane 240 will be coupled into the waveguide as the waveguide's entrance pupil to form an image for human viewing.

[0062] 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 2a) serves as an eyepiece. Through the action of this optical imaging lens assembly, the scanning curved surface 230 can be converted into an imaging plane 240 (in actual application, the transmission direction of light is from the scanning curved surface 230 to the imaging plane 240). Therefore, the side of the optical imaging lens assembly corresponding to the imaging plane 240 is referred to as the first side, and the side of the optical imaging lens assembly corresponding to the scanning curved surface 230 is referred to as the second side. In the following content, the "first side" and "second side" will be used as references to describe the embodiment of the optical imaging lens assembly. Furthermore, in the description of the subsequent embodiments, for example, with respect to a lens in the optical imaging lens assembly, the "first side surface of the Xth lens" refers to the surface of the Xth lens facing the first side.

[0063] It should be further explained that, in the field of projection, the image corresponding to the first side is a plane image, and the corresponding plane image carrier can be a projection screen, a curtain or a wall, etc. 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 use scenario of the camera field, the optical path is opposite to that in the projection field. The first side generally corresponds to the object side for collecting image information, and the second side generally corresponds to the image side obtained by collecting imaging.

[0064] Optical imaging lens

[0065] The optical imaging lens group in the embodiment of the present application includes at least: a first lens, a second lens, a third lens, a fourth lens and a fifth lens, which are arranged on the same optical axis in sequence from the first side to the second side, for a total of five lenses. It should be noted that the focal lengths corresponding to the first lens to the fifth lens in the embodiment of the present application are positive, negative, positive, negative and positive, respectively. It should be noted that by simultaneously optimizing the positive and negative focal lengths of the five lenses on the same optical axis, the optical power of the system can be reasonably dispersed, the aberrations generated by the lenses can be slowed down, and the purpose of correcting multiple aberrations can be achieved, thereby achieving clear imaging of the image side curved surface on the basis of improving the field of view. In addition, it should be emphasized that the focal length of the fifth lens is set to positive, which can enhance the convergence ability of the curved surface image to balance the aberrations.

[0066] More specifically, the various lenses preferably satisfy the following relationships: 6.22 ≤ f1 / f ≤ 23.99, -1.38 ≤ f2 / f ≤ -0.7, 0.39 ≤ f3 / f ≤ 0.52, -1.29 ≤ f4 / f ≤ -0.5, and 0.5 ≤ f5 / f ≤ 1.62; where f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f is the focal length of the optical imaging lens assembly (which can also be understood as the equivalent focal length of the optical imaging lens assembly). It should be noted that by more specifically defining the focal length of each lens, the system's optical power is more rationally distributed and configured, further enhancing correction of various aberrations and improving field of view and imaging quality. Furthermore, if the focal length of a lens is not defined in this embodiment, the focal length of the lens may be the focal length of the lens at the near optical axis. It should be emphasized that prior to the applicant's invention, existing optical imaging lens systems for projection displays were unable to achieve a balance between image quality and a wide field of view. Specifically, image quality typically decreased as the field of view increased, while maintaining image quality without achieving a wide field of view. The invention of this application, by combining and controlling the focal lengths and surface structures of the five lenses, achieves both an improved field of view and miniaturization while achieving high-quality image output.

[0067] Furthermore, in a possible implementation manner, the five lenses may be connected by spaced connections or by bonding them together, and the specific connection will depend on the needs of actual application and is not limited here.

[0068] Furthermore, in a possible implementation, the various lenses mentioned above also satisfy the following relationship:

[0069] 1.55≤n1≤1.61, 1.73≤n2≤1.76, 1.49≤n3≤1.5, 1.62≤n4≤1.76, 1.62≤n5≤1.65; wherein n1 is the refractive index of the first lens, n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, n4 is the refractive index of the fourth lens, and n5 is the refractive index of the fifth lens. Preferably, n1 is 1.55 or 1.57 or 1.61 or 1.63, n2 is 1.73 or 1.75 or 1.76, n3 is 1.49 or 1.5, n4 is 1.62 or 1.76, and n5 is 1.62 or 1.63 or 1.65. It should be noted that by optimizing the design and limitation of the refractive indices of the five lenses, the chromatic aberration coefficient of the corresponding lenses can be reasonably controlled to ensure imaging quality and a large field of view.

[0070] Further optionally, in order to better ensure imaging quality, the embodiment of the present invention also specifically and preferably limits the dispersion coefficients of the five lenses, and the dispersion coefficients of various lenses satisfy: 41.7≤v1≤62.4, 27.6≤v2≤36, 69.4≤v3≤70.4, 27.6≤v4≤36.7, 55.8≤v5≤60.3; wherein v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, v3 is the Abbe number of the third lens, v4 is the Abbe number of the fourth lens, and v5 is the Abbe number of the fifth lens. Specifically, preferably, the Abbe number of the first lens is 41.7, 49, 49.9, or 62.4; the Abbe number of the second lens is 27.6, 30.3, or 36; the Abbe number of the third lens is 69.4 or 70.4; the Abbe number of the fourth lens is 27.6 or 36.7; and the Abbe number of the fifth lens is 55.8, 58, or 60.3. It should be noted that in other embodiments of the present invention, the Abbe numbers of the five lenses are not limited to those specified in the present embodiment; other Abbe coefficients can also be used to ensure a good matching relationship between the five lenses, thereby ensuring the final imaging quality.

[0071] Further optionally, in a possible embodiment, the first side surface of the first lens is convex, and the second side surface of the first lens is concave or convex; the first side surface of the second lens is convex, and the second side surface of the second lens is concave; the first side surface and the second side surface of the third lens are both convex; the first side surface of the fourth lens is concave, and the second side surface of the fourth lens is convex; the first side surface of the fifth lens is convex, and the second side surface of the fifth lens is concave at the near optical axis, and the second side surface of the fifth lens is convex at the far optical axis. It should be noted that by defining the surface structure of the corresponding side surfaces of the above lenses, the aberrations generated between the lenses can be further effectively corrected, the optical sensitivity can be reduced, and the final imaging quality and field of view can be improved. It should also be noted that the term "convex first side surface" herein refers to a first side surface that forms a convex shape toward the first side of the optical imaging lens group; a concave first side surface refers to a first side surface that forms a concave shape toward the first side of the optical imaging lens group; a convex second side surface refers to a second side surface that forms a convex shape toward the second side of the optical imaging lens group; and a concave second side surface refers to a second side surface that forms a concave shape toward the second side of the optical imaging lens group. It should be emphasized that in other embodiments of the present invention, the surface structure of all lenses is not limited to being simultaneously defined as in this embodiment. The surface structure of at least one lens may also be defined. For example, only the surface structure of the first and second side surfaces of the fifth lens is defined, while the surface structures of other lenses are not defined.

[0072] Furthermore, in some embodiments, the surface shape of the lens is not that the entire side surface is concave or convex. The surface shape of the lens may be a composite curved surface, or the near optical axis portion is curved while the edge portion is non-curved. In particular, optionally, when the lens surface is convex and the position of the convex surface is not defined, it means that the convex surface can be located at the near optical axis of the lens surface; similarly, when the lens surface is concave and the position of the concave surface is not defined, it means that the concave surface can be located at the near optical axis of the lens surface.

[0073] Further optionally, in one possible embodiment, the first and second side surfaces of the first through fifth lenses are both aspherical. It should be noted that by limiting the design of the mirror structures of the first through fifth lenses to aspherical structures, a greater number of control variables can be obtained to reduce aberrations and reasonably reduce the number of lenses. This not only improves image quality but also facilitates the miniaturization or microfabrication of the optical imaging lens assembly. Furthermore, the fact that both the first and second side surfaces of the aforementioned lenses are aspherical can be understood as meaning that the entire or a portion of the optically effective area of ​​the lens surface is aspherical.

[0074] Further optionally, in one possible embodiment, the first through fifth lenses are all made of plastic or glass. It should be noted that making the first through fifth lenses from plastic can effectively reduce production costs. Compared to glass, the cost of plastic lenses is between one-twentieth and one-tenth of that of glass, making them highly advantageous for low-cost mass production. Furthermore, plastic lenses can typically be injection molded, which is easy to process and can be easily formed into various surface structures that meet aspheric requirements. Plastic also reduces the overall weight of the lens, facilitating lightweight product design. Glass, on the other hand, has a higher and wider range of refractive indices, offering advantages in correcting lens aberrations. Its much lower coefficient of expansion facilitates precision assembly. Furthermore, due to its inherent resistance to high temperatures, UV rays, and acids and alkalis, glass offers significant advantages in terms of longevity and performance stability. It should be emphasized that other embodiments of the present invention are not limited to the two materials provided in the present invention, namely plastic and glass; other materials capable of producing lenses may also be used.

[0075] In addition, it should be noted that the optical imaging lens assembly disclosed in the embodiment of the present invention can optionally be provided with at least one aperture stop, which can be located before the first lens (first side), between each lens, or after the last fifth lens (second side). The type of the aperture stop can be, for example, an aperture stop or a field stop, which can be used to reduce stray light and help improve image display quality.

[0076] Furthermore, in certain embodiments, the optical imaging lens assembly in the embodiments of the present application also satisfies the following optical properties:

[0077] The multiple lenses in the optical imaging lens group are arranged on the same optical axis 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 flat image, that is, to the first side of the optical imaging lens group. It should be noted that, please refer to Figures 1a to 2b ( Figure 2b (For example, in an optical imaging lens assembly containing six lenses, the lens surface closest to and opposite the exit pupil (i.e., the lens surface closest to the curved image) is concave. The optical axis and the concave surface intersect to form an intersection. The distance between the intersection and the exit pupil is the exit pupil distance, which is 1.5-6.0 mm, preferably 2-3.5 mm. It should be noted that by defining the lens surface structure and corresponding exit pupil distance of the multiple coaxial lenses in the optical imaging lens assembly that are closest to the curved image, they can be matched to the corresponding curved scanned image, thereby achieving clear imaging from the curved image to the flat image.

[0078] In addition, if further explanation is needed, please continue to refer to Figure 2b :

[0079] Entrance pupil: The entrance pupil is the effective aperture that limits the incident light beam. It is the image formed by the aperture stop on the optical system in front. It is the conjugate phase of the aperture stop in the object space. The entrance pupil corresponds to the exit pupil.

[0080] Entrance pupil position: The entrance pupil position is the position point where the aperture stop forms an image for the optical system in front. The entrance pupil position is calculated by treating the center of the aperture stop as an object point, tracing rays toward the optical system in front, and obtaining the coordinates of the intersection with the point on the optical axis. Usually, the distance from the surface of the first lens is used as the entrance pupil distance.

[0081] Exit pupil: The image formed by the aperture stop of the optical system in the image space of the optical system is the exit pupil of the lens;

[0082] Exit pupil position: The exit pupil position is the position where the aperture stop forms an image for the rear optical system. The exit pupil position is calculated by treating the center of the aperture stop as an object point, tracing rays toward the rear optical system, and obtaining the coordinates of the intersection with the point on the optical axis. The distance from the last lens surface is usually used as the exit pupil distance.

[0083] Measurement of the exit pupil position: Set a point light source at the center of the entrance pupil position and form an image through the designed lens. The optimal imaging position of the point light source is the exit pupil position.

[0084] More specifically, Figure 2b As shown, from left to right, that is, from the first side to the second side, are the entrance pupil (entrance pupil position), the optical imaging lens group, and the exit pupil (exit pupil position).

[0085] Example 1

[0086] Figure 3 Schematic diagram of the structure of an optical imaging lens assembly provided by an embodiment of the present invention. The optical imaging lens assembly includes a first side (ie, Figure 3 The side where the aperture 01 is located) to the second side (ie, Figure 3 On the side where the scanning curved surface 02 is located, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15 are arranged in sequence along the common optical axis.

[0087] In this embodiment, there is a gap between every two adjacent lenses among the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15. The first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15 are five single non-cemented lenses.

[0088] The focal lengths of the first lens 11 to the fifth lens 15 from the first side to the second side are positive, negative, positive, negative, and positive in sequence.

[0089] The first side surface of the first lens 11 is convex, and the second side surface is concave.

[0090] The first side surface of the second lens 12 is convex, and the second side surface is concave.

[0091] The first side surface and the second side surface of the third lens 13 are both convex surfaces.

[0092] The first side surface of the fourth lens 14 is concave, and the second side surface is convex.

[0093] The first side surface of the fifth lens 15 is convex, and the second side surface thereof is concave near the optical axis.

[0094] In this embodiment, the focal lengths of the first lens 11 to the fifth lens 15 in the optical imaging lens assembly satisfy the following relationship:

[0095] f1 / f is 23.99, f2 / f is -0.70, f3 / f is 0.39, f4 / f is -1.29, and f5 / f is 1.62; wherein f1 is the focal length of the first lens element 11, f2 is the focal length of the second lens element 12, f3 is the focal length of the third lens element 13, f4 is the focal length of the fourth lens element 14, f5 is the focal length of the fifth lens element 15, and f is the equivalent focal length of the optical imaging lens assembly.

[0096] The refractive index and the dispersion coefficient of the first lens element 11 to the fifth lens element 15 in the optical imaging lens assembly respectively meet the following conditions:

[0097] n1 is 1.63, n2 is 1.73, n3 is 1.5, n4 is 1.62, and n5 is 1.62. Here, n1 to n5 represent the refractive indices of the first to fifth lenses 11 to 15, respectively. The Abbe number of the first lens is 49, the Abbe number of the second lens is 30.3, the Abbe number of the third lens is 69.4, the Abbe number of the fourth lens is 36.7, and the Abbe number of the fifth lens is 60.3.

[0098] In the optical imaging lens assembly provided in Example 1 of the present invention, the overall equivalent focal length of the optical imaging lens assembly is 2.60 mm, the aperture value is 1.30, the half field angle is 10 degrees, the scanning radius is 2 mm, and the entrance pupil diameter is 2 mm. The preferred parameters of the curvature radius, thickness parameter, refractive index, and Abbe number of each lens used to image the scanning curved surface 02 are shown in Table 1:

[0099] Table 1 Structural parameters of the optical imaging lens assembly in Example 1

[0100] surface Lens number face shape Radius of curvature Thickness / spacing Material refractive index dispersion coefficient 0 Imaging plane flat unlimited unlimited 1 Aperture 01 unlimited 1 2 First lens 11 Aspheric 2.48 1.27 1.63 49 3 Aspheric 2.11 0.27 4 Second lens 12 Aspheric 1.48 1.09 1.73 30.3 5 Aspheric 0.48 0.12 6 The third lens 13 Aspheric 0.55 1.49 1.5 69.4 7 Aspheric -0.67 0.15 8 The fourth lens 14 Aspheric -0.41 0.78 1.62 36.7 9 Aspheric -0.89 0.10 10 Fifth lens 15 Aspheric 0.63 0.60 1.62 60.3 11 Aspheric 0.52 0.50 12 Scanning Surface 02 spherical surface 2

[0101] It should be noted that Table 1 provides detailed structural data for the optical imaging lens assembly of Example 1. The units for the curvature radius, thickness, and focal length are all in millimeters. Surfaces 0-12 represent the surfaces from the first side to the second side, respectively. An optical surface with an infinite curvature radius in the imaging plane is considered to be flat.

[0102] Furthermore, the aspheric conic coefficients of the surfaces corresponding to the first lens 11 to the fifth lens 15 are shown in Table 2 below:

[0103] Table 2 Aspheric cone coefficient data of different lens surfaces in Example 1

[0104]

[0105]

[0106] Table 2 shows the aspheric coefficient data in Example 1, where k is the cone coefficient in the aspheric curve equation, and A4 to A8 represent the 4th to 8th order aspheric coefficients of each surface.

[0107] 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 4 As shown, the field curvature distortion curve is as follows Figure 5 As shown, the vertical axis chromatic aberration curve is as follows Figure 6As shown in the figure; 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.

[0108] Depend on Figure 4-Figure 6 It can be seen from the observation that the optical imaging lens assembly of Example 1 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 curved surface image scanned by the fiber scanner and has good imaging effect.

[0109] Of course, in actual applications, the optical imaging lens assembly may also include a display element, a housing, etc. The display element may be disposed on the second side of the optical imaging lens assembly, and the optical imaging lens assembly may be installed in the housing, so that the curved surface image formed by scanning the image source (such as a fiber scanner) can be imaged on a plane to achieve clear imaging.

[0110] Example 2

[0111] Figure 7 Schematic diagram of the structure of an optical imaging lens assembly provided by an embodiment of the present invention. The optical imaging lens assembly includes a first side (ie, Figure 7 The side where the aperture 03 is located) to the second side (ie, Figure 7 The first lens 31, the second lens 32, the third lens 33, the fourth lens 34, and the fifth lens 35 are arranged in sequence along the common optical axis (on the side where the scanning curved surface 04 is located).

[0112] In this embodiment, there is a gap between every two adjacent lenses among the first lens 31, the second lens 32, the third lens 33, the fourth lens 34, and the fifth lens 35. The first lens 31, the second lens 32, the third lens 33, the fourth lens 34, and the fifth lens 35 are five single non-cemented lenses.

[0113] The focal lengths of the first lens 31 to the fifth lens 35 from the first side to the second side are positive, negative, positive, negative, and positive in sequence.

[0114] The first side surface of the first lens 31 is convex, and the second side surface is concave.

[0115] The first side surface of the second lens 32 is convex at the near optical axis, and the second side surface is concave.

[0116] Both the first side surface and the second side surface of the third lens 33 are convex surfaces.

[0117] The first side surface of the fourth lens 34 is concave, and the second side surface is convex.

[0118] The first side surface of the fifth lens 35 is convex, and the second side surface thereof is concave near the optical axis.

[0119] In this embodiment, the focal lengths of the first lens 31 to the fifth lens 35 in the optical imaging lens assembly satisfy the following relationship:

[0120] f1 / f is 12.29, f2 / f is -1.07, f3 / f is 0.43, f4 / f is -0.92, and f5 / f is 0.84; wherein f1 is the focal length of the first lens 31, f2 is the focal length of the second lens 32, f3 is the focal length of the third lens 33, f4 is the focal length of the fourth lens 34, f5 is the focal length of the fifth lens 35, and f is the equivalent focal length of the optical imaging lens assembly.

[0121] The refractive index and the dispersion coefficient of the first lens 31 to the fifth lens 35 in the optical imaging lens assembly respectively meet the following conditions:

[0122] n1 is 1.57, n2 is 1.76, n3 is 1.49, n4 is 1.76, and n5 is 1.63. n1 to n5 represent the refractive indices of the first to fifth lenses 31 to 35, respectively. The Abbe number of the first lens is 62.4, the Abbe number of the second lens is 27.6, the Abbe number of the third lens is 70.4, the Abbe number of the fourth lens is 27.6, and the Abbe number of the fifth lens is 58.

[0123] In the optical imaging lens assembly provided in Example 2 of the present invention, the overall equivalent focal length of the optical imaging lens assembly is 2.6 mm, the aperture value is 1.30, the half field angle is 10 degrees, the scanning radius is 2 mm, and the entrance pupil diameter is 2 mm. The preferred parameters for the curvature radius, thickness parameter, refractive index, and Abbe number of each lens used to image the scanning curved surface 04 are shown in Table 3:

[0124] Table 3 Structural parameters of the optical imaging lens assembly in Example 2

[0125]

[0126]

[0127] It should be noted that Table 3 provides detailed structural data for the optical imaging lens assembly of Example 2. The units for the curvature radius, thickness, and focal length are all in millimeters, and surfaces 0-12 represent the surfaces from the first side to the second side, respectively. An optical surface with an infinite curvature radius in the imaging plane is considered to be flat.

[0128] Furthermore, the aspheric conic coefficients of the surfaces corresponding to the first lens 31 to the fifth lens 35 are shown in Table 4 below:

[0129] Table 4 Aspheric cone coefficient data of different lens surfaces in Example 2

[0130] surface K A4 A6 A8 2 -8.34E+00 6.48E-02 -1.98E-02 3.65E-03 3 -1.86E+01 4.24E-02 -5.36E-02 1.32E-02 4 -3.42E+00 -1.38E-01 5.75E-02 -1.09E-01 5 -4.24E+00 -5.25E-02 -1.22E-01 3.53E-02 6 -5.23E+00 -1.58E-01 2.42E-01 -1.46E-01 7 -6.61E+00 -1.61E-02 1.80E-01 -1.38E-01 8 -3.54E+00 1.65E-01 -8.96E-02 2.04E-02 9 -1.55E+00 1.73E-01 -1.57E-01 8.81E-02 10 -1.44E+00 -5.11E-02 1.61E-01 -3.23E-01 11 -5.66E+00 8.10E-01 -3.49E+00 2.95E+00

[0131] Table 4 shows the aspheric coefficient data in Example 2, where k is the cone coefficient in the aspheric curve equation, and A4 to A8 represent the 4th to 8th order aspheric coefficients of each surface.

[0132] 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 8 As shown, the field curvature distortion curve is as follows Figure 9 As shown, the vertical axis chromatic aberration curve is as follows Figure 10 As shown in the figure; the optical transfer function (MTF) curve represents the comprehensive resolution level of an optical system, the field curvature distortion curve represents the F-Tan (theta) distortion value (percentage) under different field angles, and the vertical axis chromatic aberration curve represents the chromatic aberration value perpendicular to the axial direction.

[0133] Depend on Figures 8-10 It can be seen from the observation that the optical imaging lens assembly of Example 2 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 fiber scanner and has good imaging effect.

[0134] Of course, in actual applications, the optical imaging lens assembly may also include a display element, a housing, etc. The display element may be disposed on the second side of the optical imaging lens assembly, and the optical imaging lens assembly may be installed in the housing, so that the curved surface image formed by scanning the image source (such as a fiber scanner) can be imaged on a plane to achieve clear imaging.

[0135] Example 3

[0136] Figure 11 Schematic diagram of the structure of an optical imaging lens assembly provided by an embodiment of the present invention. The optical imaging lens assembly includes a first side (ie, Figure 11 The side where the aperture 05 is located) to the second side (ie, Figure 11 On the side where the scanning curved surface 06 is located, a first lens 51, a second lens 52, a third lens 53, a fourth lens 54, and a fifth lens 55 are arranged in sequence along the same optical axis.

[0137] In this embodiment, there is a gap between every two adjacent lenses among the first lens 51, the second lens 52, the third lens 53, the fourth lens 54, and the fifth lens 55. The first lens 51, the second lens 52, the third lens 53, the fourth lens 54, and the fifth lens 55 are five single non-cemented lenses.

[0138] The focal lengths of the first lens 51 to the fifth lens 55 from the first side to the second side are positive, negative, positive, negative, and positive in sequence.

[0139] Both the first side surface and the second side surface of the first lens 51 are convex surfaces.

[0140] The first side surface of the second lens 52 is convex at the near optical axis, and the second side surface is concave.

[0141] Both the first side surface and the second side surface of the third lens 53 are convex surfaces.

[0142] The first side surface of the fourth lens 54 is concave, and the second side surface is convex.

[0143] The first side surface of the fifth lens 55 is convex, the second side surface is concave at the near optical axis, and the second side surface is convex at the far optical axis.

[0144] In this embodiment, the focal lengths of the first lens 51 to the fifth lens 55 in the optical imaging lens assembly satisfy the following relationship:

[0145] f1 / f is 6.22, f2 / f is -1.04, f3 / f is 0.49, f4 / f is -0.50, and f5 / f is 0.50; wherein f1 is the focal length of the first lens 51, f2 is the focal length of the second lens 52, f3 is the focal length of the third lens 53, f4 is the focal length of the fourth lens 54, f5 is the focal length of the fifth lens 55, and f is the equivalent focal length of the optical imaging lens assembly.

[0146] The refractive index and the dispersion coefficient of the first lens element 51 to the fifth lens element 55 in the optical imaging lens assembly respectively meet the following conditions:

[0147] n1 is 1.61, n2 is 1.75, n3 is 1.49, n4 is 1.76, and n5 is 1.62. n1 to n5 represent the refractive indices of the first to fifth lenses 51 to 55, respectively. The Abbe number of the first lens is 41.7, the Abbe number of the second lens is 36, the Abbe number of the third lens is 70.4, the Abbe number of the fourth lens is 27.6, and the Abbe number of the fifth lens is 60.3.

[0148] In the optical imaging lens assembly provided in Example 3 of the present invention, the overall equivalent focal length of the optical imaging lens assembly is 2.6 mm, the aperture value is 1.30, the half field angle is 10 degrees, the scanning radius is 2 mm, and the entrance pupil diameter is 2 mm. The preferred parameters of the curvature radius, thickness parameter, refractive index, and Abbe number of each lens used to image the scanning curved surface 06 are shown in Table 5:

[0149] Table 5 Structural parameters of the optical imaging lens assembly in Example 3

[0150] surface Lens number face shape Radius of curvature Thickness / spacing Material refractive index dispersion coefficient 0 Imaging plane flat unlimited unlimited 1 Aperture 05 unlimited 1 2 First lens 51 Aspheric 92.89 1.18 1.61 41.7 3 Aspheric -11.04 0.22 4 Second lens 52 Aspheric 1.32 0.68 1.75 36 5 Aspheric 0.62 0.11 6 The third lens 53 Aspheric 0.66 1.10 1.49 70.4 7 Aspheric -5.45 0.34 8 Fourth lens 54 Aspheric -0.49 0.78 1.76 27.6 9 Aspheric -1.62 0.10 10 Fifth lens 55 Aspheric 0.76 1.46 1.62 60.3 11 Aspheric 3.09 0.50 12 Scanning Surface 06 spherical surface 2

[0151] It should be noted that Table 5 provides detailed structural data for the optical imaging lens assembly of Example 3. The units for the radius of curvature, thickness, and focal length are all in millimeters, and surfaces 0-12 represent the surfaces from the first side to the second side, respectively. An optical surface with an infinite radius of curvature in the imaging plane is considered to be flat.

[0152] Furthermore, the aspheric conic coefficients of the surfaces corresponding to the first lens 51 to the fifth lens 55 are shown in Table 6 below:

[0153] Table 6 Aspheric cone coefficient data of different lens surfaces in Example 3

[0154] surface K A4 A6 A8 2 4.00E+02 7.12E-02 -2.24E-02 5.06E-03 3 2.04E+01 5.23E-02 -4.36E-02 5.73E-03 4 -2.37E+00 -1.05E-01 3.87E-02 -9.85E-02 5 -4.20E+00 -7.52E-02 -1.12E-01 4.58E-02 6 -4.34E+00 -2.01E-01 2.38E-01 -1.05E-01 7 -5.49E+00 -5.81E-02 1.52E-01 -1.17E-01 8 -3.39E+00 2.07E-01 -9.29E-02 7.88E-03 9 -1.18E+00 1.73E-01 -1.03E-01 5.87E-02 10 -1.50E+00 -2.44E-01 1.97E-01 -2.78E-01 11 -2.61E+01 -6.17E-01 4.00E-01 -9.63E-02

[0155] Table 6 shows the aspheric coefficient data in Example 3, where k is the cone coefficient in the aspheric curve equation, and A4 to A8 represent the 4th to 8th order aspheric coefficients of each surface.

[0156] 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 12 As shown, the field curvature distortion curve is as follows Figure 13 As shown, the vertical axis chromatic aberration curve is as follows Figure 14 As shown in the figure; 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.

[0157] Depend on Figure 12-14 It can be seen from the observation that the optical imaging lens assembly of Example 3 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 fiber scanner and has good imaging effect.

[0158] Of course, in actual applications, the optical imaging lens assembly may also include a display element, a housing, etc. The display element may be disposed on the second side of the optical imaging lens assembly, and the optical imaging lens assembly may be installed in the housing, so that the curved surface image formed by scanning the image source (such as a fiber scanner) can be imaged on a plane to achieve clear imaging.

[0159] Example 4

[0160] Figure 15 Schematic diagram of the structure of an optical imaging lens assembly provided by an embodiment of the present invention. The optical imaging lens assembly includes a first side (ie, Figure 15 The side where the aperture 07 is located) to the second side (ie, Figure 15 A first lens 71, a second lens 72, a third lens 73, a fourth lens 74, a fifth lens 75, and a sixth lens 76 are sequentially arranged along a common optical axis (on the side where the scanning curved surface 08 is located). It should be noted that the first lens 71 provided in this embodiment of the present invention is equivalent to an additional lens, and the positive and negative focal lengths of the second lens 72, the third lens 73, the fourth lens 74, the fifth lens 75, and the sixth lens 76 correspond to the positive and negative focal lengths of the five lenses mentioned in the aforementioned embodiment. The terms "first," "second," and so on in this embodiment do not distinguish the importance or order of the lenses; they are simply names used to distinguish different components.

[0161] In this embodiment, there is a gap between every two adjacent lenses among the first lens 71, the second lens 72, the third lens 73, the fourth lens 74, the fifth lens 75, and the sixth lens 76. The first lens 71, the second lens 72, the third lens 73, the fourth lens 74, the fifth lens 75, and the sixth lens 76 are six single non-cemented lenses.

[0162] The focal lengths of the first lens 71 to the sixth lens 76 from the first side to the second side are positive, positive, negative, positive, negative, and positive in sequence.

[0163] The first side surface of the first lens 71 is concave, and the second side surface is convex.

[0164] The first side surface of the second lens 72 is convex, and the second side surface thereof is concave near the optical axis.

[0165] The first side surface of the third lens 73 is convex, and the second side surface thereof is concave near the optical axis.

[0166] The first side surface and the second side surface of the fourth lens 74 are both convex surfaces.

[0167] A first side surface of the fifth lens 75 is concave, and a second side surface is convex.

[0168] The first side surface of the sixth lens 76 is convex, and the second side surface thereof is concave near the optical axis.

[0169] In this embodiment, the focal lengths of the first lens 71 to the sixth lens 76 in the optical imaging lens assembly satisfy the following relationship:

[0170] f1 / f is 3.81, f2 / f is 5.19, f3 / f is -0.42, f4 / f is 0.39, f5 / f is -1.35, and f6 / f is 5.18; wherein f1 is the focal length of the first lens 71, f2 is the focal length of the second lens 72, f3 is the focal length of the third lens 73, f4 is the focal length of the fourth lens 74, f5 is the focal length of the fifth lens 75, f6 is the focal length of the sixth lens 76, and f is the equivalent focal length of the optical imaging lens assembly.

[0171] The refractive index and the dispersion coefficient of the first lens 71 to the sixth lens 76 in the optical imaging lens assembly respectively meet the following conditions:

[0172] n1 is 1.69, n2 is 1.56, n3 is 1.69, n4 is 1.58, n5 is 1.69, and n6 is 1.69. n1 to n6 represent the refractive indices of the first to sixth lenses 71 to 76, respectively. The Abbe number of the first lens is 42.3, the Abbe number of the second lens is 64.1, the Abbe number of the third lens is 30.8, the Abbe number of the fourth lens is 62.8, the Abbe number of the fifth lens is 30.8, and the Abbe number of the sixth lens is 49.4.

[0173] In the optical imaging lens assembly provided in the fourth embodiment of the present invention, the optical imaging lens assembly has an equivalent focal length of 2.6 mm, an aperture value of 1.30, a half field angle of 10 degrees, a scanning radius of 2 mm, and an entrance pupil diameter of 2 mm. The preferred parameters of the curvature radius, thickness parameter, refractive index, and Abbe number of each lens used to image the scanning curved surface 08 are shown in Table 7:

[0174] Table 7 Structural parameters of the optical imaging lens assembly in Example 4

[0175] surface Lens number face shape Radius of curvature Thickness / spacing Material refractive index dispersion coefficient 0 Imaging plane flat unlimited unlimited 1 Aperture 07 unlimited 1 2 First lens 71 spherical surface -3.47 0.86 1.69 42.3 3 spherical surface -2.55 0.10 4 Second lens 72 Aspheric 8.89 1.61 1.56 64.1 5 Aspheric -48.46 0.10 6 The third lens 73 Aspheric 3.80 1.83 1.69 30.8 7 Aspheric 0.51 0.20 8 Fourth lens 74 Aspheric 0.75 1.44 1.58 62.8 9 Aspheric -0.77 0.12 10 Fifth lens 75 Aspheric -0.58 0.60 1.69 30.8 11 Aspheric -1.09 0.10 12 Sixth lens 76 Aspheric 0.96 0.78 1.69 49.4 13 Aspheric 0.72 0.50 14 Scanning Surface 08 spherical surface 2

[0176] It should be noted that Table 7 provides detailed structural data for the optical imaging lens assembly of Example 4. The units for the radius of curvature, thickness, and focal length are all in millimeters, and surfaces 0-14 represent the surfaces from the first side to the second side, respectively. An optical surface with an infinite radius of curvature in the imaging plane is considered to be flat.

[0177] Furthermore, the aspheric conic coefficients of the surfaces corresponding to the first lens 71 to the sixth lens 76 are shown in Table 8 below:

[0178] Table 8 Aspheric cone coefficient data of different lens surfaces in Example 4

[0179]

[0180]

[0181] Table 8 shows the aspheric coefficient data in Example 4, where k is the cone coefficient in the aspheric curve equation, and A4 to A8 represent the 4th to 8th order aspheric coefficients of each surface.

[0182] 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 16 As shown, the field curvature distortion curve is as follows Figure 17 As shown, the vertical axis chromatic aberration curve is as follows Figure 18 As shown in the figure; 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.

[0183] Depend on Figure 16-18 It can be seen from the observation 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 fiber scanner and has good imaging effect.

[0184] Of course, in actual applications, the optical imaging lens assembly may also include a display element, a housing, etc. The display element may be disposed on the second side of the optical imaging lens assembly, and the optical imaging lens assembly may be installed in the housing, so that the curved surface image formed by scanning the image source (such as a fiber scanner) can be imaged on a plane to achieve clear imaging.

[0185] Example 5

[0186] Figure 19 Schematic diagram of the structure of an optical imaging lens assembly provided by an embodiment of the present invention. The optical imaging lens assembly includes a first side (ie, Figure 19 The aperture 09 in the side) to the second side (ie, Figure 19 A first lens 91, a second lens 92, a third lens 93, a fourth lens 94, and a fifth lens 95 are arranged in sequence along the same optical axis (on the side where the scanning curved surface 10 is located).

[0187] In this embodiment, there is a gap between every two adjacent lenses among the first lens 91, the second lens 92, the third lens 93, the fourth lens 94, and the fifth lens 95. The first lens 91, the second lens 92, the third lens 93, the fourth lens 94, and the fifth lens 95 are five single non-cemented lenses.

[0188] The focal lengths of the first lens 91 to the fifth lens 95 from the first side to the second side are positive, negative, positive, negative, and positive in sequence.

[0189] The first side surface of the first lens 91 is convex, and the second side surface thereof is concave near the optical axis.

[0190] The first side surface of the second lens 92 is convex at the near optical axis, and the second side surface is concave.

[0191] The first side surface and the second side surface of the third lens 93 are both convex surfaces.

[0192] The first side surface of the fourth lens 94 is concave, and the second side surface is convex.

[0193] The first side surface of the fifth lens 95 is convex, and the second side surface thereof is concave near the optical axis.

[0194] In this embodiment, the focal lengths of the first lens 91 to the fifth lens 95 in the optical imaging lens assembly satisfy the following relationship:

[0195] f1 / f is 7.75, f2 / f is -1.38, f3 / f is 0.52, f4 / f is -0.70, and f5 / f is 0.60; wherein f1 is the focal length of the first lens 91, f2 is the focal length of the second lens 92, f3 is the focal length of the third lens 93, f4 is the focal length of the fourth lens 94, f5 is the focal length of the fifth lens 95, and f is the equivalent focal length of the optical imaging lens assembly.

[0196] The refractive index and the dispersion coefficient of the first lens element 91 to the fifth lens element 95 in the optical imaging lens assembly respectively meet the following conditions:

[0197] n1 is 1.55, n2 is 1.76, n3 is 1.49, n4 is 1.76, and n5 is 1.65. n1 to n5 represent the refractive indices of the first to fifth lenses 91 to 95, respectively. The Abbe number of the first lens is 49.9, the Abbe number of the second lens is 27.6, the Abbe number of the third lens is 70.4, the Abbe number of the fourth lens is 27.6, and the Abbe number of the fifth lens is 55.8.

[0198] The optical imaging lens assembly provided by the embodiment of the present invention has an equivalent focal length of 2.6 mm, an aperture of 1.30, a half-field angle of 10 degrees, a scanning radius of 2 mm, and an entrance pupil diameter of 2 mm. The preferred parameters for the curvature radius, thickness, refractive index, and Abbe number of each lens used to image the scanning curved surface 10 are shown in Table 9:

[0199] Table 9 Structural parameters of the optical imaging lens assembly in Example 5

[0200]

[0201]

[0202] It should be noted that Table 9 provides detailed structural data for the optical imaging lens assembly of Example 5. The units for the curvature radius, thickness, and focal length are all in millimeters, and surfaces 0-12 represent the surfaces from the first side to the second side, respectively. An optical surface with an infinite curvature radius in the imaging plane is considered to be flat.

[0203] Furthermore, the aspheric conic coefficients of the surfaces corresponding to the first lens 91 to the fifth lens 95 are shown in Table 10 below:

[0204] Table 10 Aspheric cone coefficient data of different lens surfaces in Example 5

[0205] surface K A4 A6 A8 2 -5.33E+01 3.63E-02 -3.23E-02 4.09E-03 3 -3.27E+02 -5.07E-02 -1.97E-02 5.75E-03 4 -4.40E+00 -1.10E-01 2.55E-02 -9.77E-02 5 -4.99E+00 -4.32E-02 -8.18E-02 2.34E-02 6 -6.91E+00 -2.32E-01 2.83E-01 -1.17E-01 7 -1.17E+01 -3.64E-02 1.27E-01 -9.09E-02 8 -5.13E+00 2.41E-01 -4.87E-02 -3.45E-02 9 2.52E-01 1.37E-01 -1.16E-02 3.05E-02 10 -1.15E+00 -1.40E-01 1.85E-01 -1.51E-01 11 -6.66E+00 3.32E-01 -1.63E+00 1.27E+00

[0206] Table 10 shows the aspheric coefficient data in Example 5, where k is the cone coefficient in the aspheric curve equation, and A4 to A8 represent the 4th to 8th order aspheric coefficients of each surface.

[0207] 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 20 As shown, the field curvature distortion curve is as follows Figure 21 As shown, the vertical axis chromatic aberration curve is as follows Figure 22 As shown in the figure; the optical transfer function (MTF) curve represents the comprehensive resolution level of an optical system, the field curvature distortion curve represents the F-Tan (theta) distortion value (percentage) under different field angles, and the vertical axis chromatic aberration curve represents the chromatic aberration value perpendicular to the axial direction.

[0208] Depend on Figure 20-22 It can be seen from the observation that the optical imaging lens assembly of Example 5 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 fiber scanner and has good imaging effect.

[0209] Of course, in actual applications, the optical imaging lens assembly may also include a display element, a housing, etc. The display element may be disposed on the second side of the optical imaging lens assembly, and the optical imaging lens assembly may be installed in the housing, so that the curved surface image formed by scanning the image source (such as a fiber scanner) can be imaged on a plane to achieve clear imaging.

[0210] Scanning display device

[0211] 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 fiber scanner), wherein the first side of the optical imaging lens group faces the light output direction of the fiber scanner. Preferably, the optical imaging lens group is coaxial with the central optical axis of the fiber scanner. Of course, the structure and general principle of the fiber scanner can be referred to the aforementioned Figure 1a 、 1b I will not go into details about the corresponding content here.

[0212] Near-eye display devices

[0213] 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 embodiment of this application, and used as a head-mounted AR device (such as AR glasses). The scanning display device is set in the near-eye display module.

[0214] The near-eye display module may include: a light source, a processing control circuit, a wearable frame structure, a waveguide, etc. The image beam output by the light source enters the scanning display device, and is scanned by the fiber scanner therein and output to the optical display lens group. The scanning surface of the fiber scanner (see Figure 3 Scan surface 02 and the corresponding Figure 2a The scanning surface 230 in the optical display lens group is converted into an imaging plane (refer to Figure 2a The imaging plane 240 in the waveguide is coupled into the waveguide as the entrance pupil plane of the waveguide, and then coupled out through the waveguide expansion imaging to enter the human eye.

[0215] As another possible implementation, the scanning display device can further cooperate with the near-eye display module to form the near-eye display device in the embodiment of the present application, and be used as a head-mounted VR device (e.g., VR helmet / glasses). The scanning display device is disposed in the near-eye display module.

[0216] In the embodiment of the present application, by reasonably optimizing the focal lengths of the five 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 on the basis of improving the field of view angle; by limiting and optimizing the refractive index, dispersion coefficient and surface structure of the five coaxial lenses, the imaging quality and field of view angle are further improved; by limiting and optimizing the design of the five coaxial lenses as aspherical surface structures, the imaging quality is further improved, and the overall structure of the optical imaging lens group is also more compact, meeting the production requirements of miniaturization of lens products.

[0217] The above description is merely a preferred specific embodiment of the present application. Each embodiment is only used to illustrate the technical solution of the present application and is not intended to limit the present application. Any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or effective experiments based on the concept of the present application should be within the scope of the present application.

[0218] The various embodiments in this application are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0219] The terms "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 terms do not limit the corresponding components. These terms are provided solely for the purpose of distinguishing one element from another. For example, "a first lens" and "a second lens" denote different lenses, even though both are lenses.

Claims

1. An optical imaging lens assembly, characterized in that: The optical imaging lens assembly at least includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are arranged on a common optical axis in sequence from the first side to the second side. The focal lengths corresponding to the first lens to the fifth lens are positive, negative, positive, negative and positive, respectively. The lenses satisfy the following relationship: 6.22≤f1 / f≤23.99, -1.38≤f2 / f≤-0.7, 0.39≤f3 / f≤0.52, -1.29≤f4 / f≤-0.5, 0.5≤f5 / f≤1.62, wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f is the focal length of the optical imaging lens assembly; the exit pupil distance of the optical imaging lens assembly is 1.5-6.0 mm.

2. The optical imaging lens assembly according to claim 1, wherein: The second side surface of the fifth lens is concave at the near optical axis.

3. The optical imaging lens assembly according to claim 2, wherein: Each of the lenses further satisfies the following relationship: 1.55≤n1≤1.61, 1.73≤n2≤1.76, 1.49≤n3≤1.5, 1.62≤n4≤1.76, 1.62≤n5≤1.65; wherein n1 is the refractive index of the first lens, n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, n4 is the refractive index of the fourth lens, and n5 is the refractive index of the fifth lens; The dispersion coefficients of the various lenses satisfy: 41.7≤v1≤62.4, 27.6≤v2≤36, 69.4≤v3≤70.4, 27.6≤v4≤36.7, 55.8≤v5≤60.3; wherein v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, v3 is the Abbe number of the third lens, v4 is the Abbe number of the fourth lens, and v5 is the Abbe number of the fifth lens.

4. The optical imaging lens assembly according to claim 3, wherein: The n1 is 1.55 or 1.57 or 1.61 or 1.63, the n2 is 1.73 or 1.75 or 1.76, the n3 is 1.49 or 1.5, the n4 is 1.62 or 1.76, and the n5 is 1.62 or 1.63 or 1.65; The Abbe number of each lens satisfies: the Abbe number of the first lens is 41.7 or 49 or 49.9 or 62.4, the Abbe number of the second lens is 27.6 or 30.3 or 36, the Abbe number of the third lens is 69.4 or 70.4, the Abbe number of the fourth lens is 27.6 or 36.7, and the Abbe number of the fifth lens is 55.8 or 58 or 60.

3.

5. The optical imaging lens assembly according to claim 2, wherein: The first side surface of the fifth lens is convex, and the second side surface of the fifth lens is convex at the far optical axis; the first side surface of the fourth lens is concave, and the second side surface of the fourth lens is convex.

6. The optical imaging lens assembly according to any one of claims 1 to 5, wherein: The first side surface of the first lens is a convex surface, and the second side surface of the first lens is a concave surface or a convex surface.

7. The optical imaging lens assembly according to claim 6, wherein: The first side surface of the second lens is convex, and the second side surface of the second lens is concave; the first side surface and the second side surface of the third lens are both convex; The first side surface and the second side surface of the first lens to the fifth lens are all aspherical structures; The second side of the optical imaging lens assembly corresponds to a curved image, and the first side of the optical imaging lens assembly corresponds to a flat image.

8. A scanning display device, characterized in that: A device comprising a fiber scanner and an optical imaging lens assembly according to any one of claims 1 to 7, wherein the fiber scanner is used to scan and emit light for 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 fiber scanner; The fiber scanner includes an actuator and an optical fiber fixed on the actuator. The portion of the optical fiber extending beyond the actuator forms an optical fiber cantilever. The optical fiber cantilever performs two-dimensional scanning under the drive of the actuator.

9. A near-eye display device, characterized in that: The near-eye display device is used as a head-mounted augmented reality device, and at least includes a near-eye display module and a scanning display device according to claim 8, and the scanning display device is arranged in the near-eye display module.

10. A near-eye display device, characterized in that: The near-eye display device is used as a head-mounted virtual reality device, and at least includes a near-eye display module and a scanning display device according to claim 8, and the scanning display device is arranged in the near-eye display module.

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