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

Abstract

The embodiment of the application discloses an optical imaging lens, a scanning display device and a near-eye display device, and relates to the technical field of scanning display. The optical imaging lens can reasonably disperse the optical power of the system, slow down the aberration generated by the lens, achieve the purpose of correcting various aberrations, and realize clear imaging of the image surface on the basis of improving the field of view by reasonably optimizing the focal lengths of five coaxial lenses of the optical imaging lens. The field of view and the imaging quality are further improved by limiting and optimizing the refractive index, the dispersion coefficient and the surface structure of the five coaxial lenses. The overall structure of the optical imaging lens can be more compact on the basis of further improving the imaging quality by limiting and optimizing the five coaxial lenses to be aspherical surface structures, so that the production demand of miniaturization of the lens product is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of scanning display, in particular to an optical imaging lens, a scanning display device and a near-eye display device. BACKGROUND

[0002] Scanning display imaging as a new display technology can be used in various application scenarios such as projection display and near-eye display.

[0003] However, in the existing scanning display imaging system, there are high processing difficulty, high mass production cost, poor imaging quality, small field of view angle and the inability to be miniaturized, which limits the application of scanning display imaging technology in the market, especially when it is applied to the near-eye display scenario. The imaging effect and the field of view angle limit the performance requirements of high resolution in near-eye display, thereby hindering the development of near-eye display to the consumer market. SUMMARY

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

[0005] The optical imaging lens provided by the embodiments of the present application comprises at least a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence from a first side to a second side and coaxially, and the focal lengths of the first lens to the fifth lens are negative, negative, positive, positive and positive respectively.

[0006] Optionally, -3.03≤f1 / f≤-1.76, -2.77≤f2 / f≤-0.95, wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, and f is the focal length of the optical imaging lens.

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

[0008] Optionally, the various lenses also satisfy the following relationships: 0.33≤f3 / f≤0.35, 0.91≤f4 / f≤0.97 and 8.98≤f5 / f≤19.23; wherein 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.

[0009] The various lenses also satisfy the following relationship: 1.57≤n1≤1.65, 1.64≤n2≤1.76, 1.51≤n3≤1.56, 1.49≤n4≤1.52, 1.5≤n5≤1.61; 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: 33.8≤v1≤41.7, 27.6≤v2≤33.8, 56.2≤v3≤64.2, 56.2≤v4≤70.4, 56.7≤v5≤69; 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, n1 is 1.57 or 1.58 or 1.65, n2 is 1.64 or 1.65 or 1.76, n3 is 1.51 or 1.52 or 1.56, n4 is 1.49 or 1.52 or 1.50, and n5 is 1.5 or 1.53 or 1.61.

[0012] The dispersion coefficients of the various lenses satisfy: the Abbe number of the first lens is 33.8 or 37.6 or 41.7, the Abbe number of the second lens is 27.6 or 28.9 or 33.8, the Abbe number of the third lens is 56.2 or 64.2 or 68.3, the Abbe number of the fourth lens is 56.2 or 69.1 or 70.4, and the Abbe number of the fifth lens is 55.7 or 60 or 69.

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

[0014] Optionally, the first side surface of the first lens is convex, and the second side surface of the first lens is concave at the near optical axis.

[0015] Optionally, the first side surface of the second lens is convex at the near optical axis, and the second side surface of the second lens is concave; the first side surface of the third lens is convex at the near optical axis, and the second side surface of the third lens is convex or concave.

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

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

[0018] The scanning display device also includes an optical fiber scanner configured to scan and emit light of an image to be displayed, and the optical imaging lens configured to magnify and project a scanning surface corresponding to the light emitted by the optical fiber scanner.

[0019] The optical fiber scanner includes an actuator and an optical fiber fixed to the actuator, and a portion of the optical fiber beyond the actuator forms an optical fiber cantilever, which is driven by the actuator to perform two-dimensional scanning.

[0020] The near-eye display device is used as a head-mounted augmented reality device and includes at least a near-eye display module and the scanning display device.

[0021] The near-eye display device is used as a head-mounted virtual reality device and includes at least a near-eye display module and the scanning display device.

[0022] The technical solutions in the embodiments of the present application can achieve the following technical effects:

[0023] In the embodiments of the present application, the focal lengths of the five coaxial lenses of the optical imaging lens are reasonably optimized to reasonably disperse the optical power of the system, slow down the aberration generated by the lens, achieve the purpose of correcting various aberrations, and clearly image the curved surface on the image side on the basis of improving the field of view. At the same time, the optical imaging lens has a compact overall structure due to the reasonable number of lens combinations, which meets the production needs of miniaturized lens products.

[0024] Further, the refractive index, dispersion coefficient, and surface structure of the five coaxial lenses are limited and optimized to further improve the field of view and imaging quality.

[0025] Other features and advantages of the present application will be described in the following description, and some will become apparent from the description, or will be understood from the practice of the present application. The purpose and other advantages of the present application can be achieved and obtained by the structures and / or processes specifically pointed out in the specification, claims, and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0026] Other features, objects, and advantages of the application will become more apparent from the following detailed description when read in conjunction with the accompanying drawings:

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

[0028] Figure 2a is a schematic diagram of scanning output of a fiber scanner provided by embodiments of the application;

[0029] Figure 2b is a schematic diagram of the positional relationship between an optical imaging lens group and an entrance pupil position and an exit pupil position and a corresponding exit pupil distance provided by embodiments of the application;

[0030] Figure 3 is a structural schematic diagram of an optical imaging lens group provided by Embodiment One of the application;

[0031] Figure 4 is an MTF curve diagram of the optical imaging lens group in Embodiment One of the application;

[0032] Figure 5 is a field curvature distortion curve diagram of the optical imaging lens group in Embodiment One of the application;

[0033] Figure 6 is a sagittal chromatic aberration diagram of the optical imaging lens group in Embodiment One of the application.

[0034] Figure 7 is a structural schematic diagram of an optical imaging lens group provided by Embodiment Two of the application;

[0035] Figure 8 is an MTF curve diagram of the optical imaging lens group in Embodiment Two of the application;

[0036] Figure 9 is a field curvature distortion curve diagram of the optical imaging lens group in Embodiment Two of the application;

[0037] Figure 10 is a sagittal chromatic aberration diagram of the optical imaging lens group in Embodiment Two of the application.

[0038] Figure 11 is a structural schematic diagram of an optical imaging lens group provided by Embodiment Three of the application;

[0039] Figure 12 is an MTF curve diagram of the optical imaging lens group in Embodiment Three of the application;

[0040] Figure 13 is a field curvature distortion curve diagram of the optical imaging lens group in Embodiment Three of the application;

[0041] Figure 14is an axial chromatic aberration diagram of the optical imaging lens set in Embodiment Three of the present application;

[0042] Figure 15 is a structural schematic diagram of an optical imaging lens set provided in Embodiment Four of the present application;

[0043] Figure 16 is an MTF curve diagram of the optical imaging lens set in Embodiment Four of the present application;

[0044] Figure 17 is a field curvature distortion curve diagram of the optical imaging lens set in Embodiment Four of the present application;

[0045] Figure 18 is an axial chromatic aberration diagram of the optical imaging lens set in Embodiment Four of the present application.

[0046] Figure: 100-processor; 110-laser group; 120-optical fiber scanning module; 130-transmission optical fiber; 140-light source modulation circuit; 150-scanning driving circuit; 160-beam combination unit; 121-scanning actuator; 121a-slow axis; 121b-fast axis; 122-optical fiber cantilever; 123-lens group; 124-scanner package shell; 125-fixing member; 230-scanning curved surface; 240-imaging plane; 11-first lens; 12-second lens; 13-third lens; 14-fourth lens; 15-fifth lens; 01-diaphragm; 02-scanning curved surface; 31-first lens; 32-second lens; 33-third lens; 34-fourth lens; 35-fifth lens; 03-diaphragm; 04-scanning curved surface; 51-first lens; 52-second lens; 53-third lens; 54-fourth lens; 55-fifth lens; 05-diaphragm; 06-scanning curved surface; 71-first lens; 72-second lens; 73-third lens; 74-fourth lens; 75-fifth lens; 76-sixth lens; 07-diaphragm; 08-scanning curved surface. DETAILED DESCRIPTION

[0047] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related application, and are not a limitation of the application. In addition, it should be noted that, for the convenience of description, only the parts related to the application are shown in the drawings.

[0048] Illustrative scanning display system

[0049] For the current scanning display imaging, it can be realized by a digital micromirror device (DMD) or a fiber scanning display (FSD) device. The FSD scheme is a new type of scanning display imaging method, which realizes the scanning output of the image through a fiber scanner. In order to enable those skilled in the art to clearly understand the scheme of the present application, the brief principle and the corresponding system of the fiber scanning imaging are described below.

[0050] As shown in Figure 1a , it is an illustrative scanning display system in the present application, which mainly includes:

[0051] The processor 100, the laser group 110, the fiber scanning module 120, the transmission fiber 130, the light source modulation circuit 140, the scanning driving circuit 150 and the beam combining unit 160. Among them,

[0052] The processor 100 can be a graphics processing unit (GPU), a central processing unit (CPU) or other chips or circuits with control function and image processing function, which is not specifically limited here.

[0053] When the system works, the processor 100 can control the light source modulation circuit 140 to modulate the laser group 110 according to the image data to be displayed. The laser group 110 contains multiple monochromatic lasers, which respectively emit light beams of different colors. As can be seen from FIG. 1, the laser group can specifically use red (R), green (G) and blue (B) lasers. The light beams emitted by each laser in the laser group 110 are combined into a laser beam by the beam combining unit 160 and coupled into the transmission fiber 130.

[0054] The processor 100 can also control the scanning driving circuit 150 to drive the fiber scanner in the fiber scanning module 120 to scan, so as to scan and output the light beam transmitted in the transmission fiber 130.

[0055] A beam of light output from a fiber optic scanner acts on a specific pixel on the surface of a medium, forming a light spot at that pixel, thus achieving scanning of that pixel location. Driven by the fiber optic scanner, the output end of the transmission fiber 130 sweeps along a specific scanning trajectory, causing the beam to move to the corresponding pixel location. During the actual scanning process, the beam output from the transmission fiber 130 forms a light spot with corresponding image information (such as color, grayscale, or brightness) at each pixel location. Within one frame, the beam traverses each pixel location at a sufficiently high speed to complete the scanning of one frame of the image. Due to the "visual persistence" characteristic of human vision, the human eye cannot perceive the movement of the beam at each pixel location, but instead sees a complete image frame.

[0056] Continue to refer to Figure 1b The specific structure of the fiber optic scanning module 120 includes: a scanning actuator 121, a fiber optic cantilever 122, a mirror assembly 123, a scanner housing 124, and a fixing member 125. The scanning actuator 121 is fixed to the scanner housing 124 by the fixing member 125. The transmission fiber 130 extends from the front end of the scanning actuator 121 to form the fiber optic cantilever 122 (also called the scanning fiber). During operation, driven by the scanning drive signal, the slow axis 121a (also called the first actuation part) of the scanning actuator 121 moves along the vertical direction (this vertical direction is parallel to the...). Figure 1a , 1b The Y-axis in the reference coordinate system (in this application, the vertical direction can also be referred to as the first direction) vibrates, and its fast axis 121b (also referred to as the second actuator) vibrates along the horizontal direction (this horizontal direction is parallel to the reference coordinate system). Figure 1a , 1b The X-axis in the reference coordinate system (in this application, this horizontal direction can also be referred to as the second direction) vibrates, driven by the scanning actuator 121. The front end of the fiber optic cantilever 122 performs a two-dimensional sweep along a preset trajectory and emits a light beam. The emitted light beam can then pass through the mirror assembly 123 to achieve scanning imaging. Generally, the structure composed of the scanning actuator 121 and the fiber optic cantilever 122 can be called a fiber optic scanner.

[0057] like Figure 2a As shown in this embodiment, the motion trajectory of the optical fiber output end forms a scanning surface 230 through the movement of the fast and slow axes. After passing through the corresponding lens group 123, it is converted into an imaging plane 240. When applied to near-eye display devices such as augmented reality (AR) devices, the imaging plane 240 is coupled into the waveguide as the entrance pupil of the waveguide to form an image for human viewing.

[0058] To facilitate description and enable those skilled in the art to easily understand the solution of this application, it should be noted that the optical imaging lens assembly in this application (such as...) Figure 2aThe optical imaging lens group 123 shown in the middle as an eyepiece can convert the scanning curved surface 230 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) through the action of the optical imaging lens group, so that the side corresponding to the imaging plane 240 of the optical imaging lens group is referred to as the first side, and the side corresponding to the scanning curved surface 230 of the optical imaging lens group is referred to as the second side. In the subsequent content, the embodiments of the optical imaging lens group are described by taking the "first side" and "second side" as references. In addition, in the subsequent embodiments, for a certain lens in the optical imaging lens group, the "first side surface of the Xth lens" refers to the surface of the Xth lens facing the first side.

[0059] Further, in the projection field, the image corresponding to the first side is a planar image, and the corresponding planar image carrier can be, for example, a projection screen, a curtain or a wall surface, etc., and the image corresponding to the second side is a curved surface image, that is, a scanning surface in an arc shape scanned by a fiber scanner or emitted by other image sources; in the use scenario in the camera field, the optical path is opposite to that in the projection field, and the first side generally corresponds to the object side for collecting image information, and the second side generally corresponds to the image side for collecting imaging.

[0060] Optical imaging lens

[0061] The optical imaging lens group in the embodiments of the present application at least includes: a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence from the first side to the second side and coaxially. It should be noted that the focal lengths of the first lens to the fifth lens in the embodiments of the present application are negative, negative, positive, positive and positive, respectively. It should be noted that by simultaneously optimizing the positive and negative of the focal lengths of the five coaxial lenses, the optical power of the system can be reasonably dispersed, the aberration generated by the lens can be slowed down, and the purpose of correcting various aberrations can be achieved, so that clear imaging of the curved surface on the image side can be realized 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 be positive, which can strengthen the convergence ability of the curved surface image to balance the aberration.

[0062] Further specifically preferably, the various lenses satisfy the following relationship: -3.03≤f1 / f≤-1.76, -2.77≤f2 / f≤-0.95, 0.33≤f3 / f≤0.35, 0.91≤f4 / f≤0.97, and 8.98≤f5 / f≤19.23; 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 (which can also be understood as the equivalent focal length of the optical imaging lens). It should be noted that by more specifically limiting the size of the focal length of each lens, the power of the system is more reasonably dispersed and configured, thereby further strengthening the correction of various aberrations and improving the field of view angle and imaging quality. In addition, if the position of the lens focal length in the region is not defined in the embodiment, it means that the focal length of the lens can be the focal length of the lens at the near optical axis. It should be emphasized that before the present application, the existing optical imaging lens for projection display cannot balance the imaging quality and large field of view angle, that is, the field of view angle is usually improved at the expense of the imaging quality, and it is difficult to ensure the imaging quality while achieving a large field of view angle. The present application achieves high-quality imaging output while improving the field of view angle and being small in size by controlling the focal length and surface structure of the five lenses.

[0063] Further, in a possible implementation, the connection between the five lenses can be spaced apart or bonded together by adhesion, which will be determined according to the actual application, and is not limited here.

[0064] Further, in a possible implementation, the various lenses satisfy the following relationship:

[0065] 1.57≤n1≤1.65, 1.64≤n2≤1.76, 1.51≤n3≤1.56, 1.49≤n4≤1.52, and 1.5≤n5≤1.61; 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 1.57 or 1.58 or 1.65, n2 is 1.64 or 1.65 or 1.76, n3 is 1.51 or 1.52 or 1.56, n4 is 1.49 or 1.52 or 1.50, and n5 is 1.5 or 1.53 or 1.61. It should be noted that by optimizing the design of the refractive index of the five lenses, the dispersion coefficient of the corresponding lens can be reasonably controlled to ensure the imaging quality and large field of view angle.

[0066] Further optionally, in order to better ensure the imaging quality, the embodiments of the present application further preferably limit the dispersion coefficients of the five lenses, and the dispersion coefficients of the various lenses satisfy: 33.8≤v1≤41.7, 27.6≤v2≤33.8, 56.2≤v3≤64.2, 56.2≤v4≤70.4, and 56.7≤v5≤69; 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, the Abbe number of the first lens is preferably 33.8 or 37.6 or 41.7, the Abbe number of the second lens is preferably 27.6 or 28.9 or 33.8, the Abbe number of the third lens is preferably 56.2 or 64.2 or 68.3, the Abbe number of the fourth lens is preferably 56.2 or 69.1 or 70.4, and the Abbe number of the fifth lens is preferably 55.7 or 60 or 69. It should be noted that in other embodiments of the present application, the Abbe numbers of the five lenses are not limited to those defined in the embodiments of the present application, and other dispersion coefficients that can ensure good matching relationship of the five lenses can also be used to ensure the final imaging quality.

[0067] Further optionally, in one possible implementation, 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 at the near optical axis; the first side surface of the second lens is a convex surface at the near optical axis, and the second side surface of the second lens is a concave surface; the first side surface of the third lens is a convex surface at the near optical axis, and the second side surface of the third lens is a convex surface or a concave surface; the first side surface of the fourth lens is a convex surface or a concave surface, and the second side surface of the fourth lens is a convex surface at the near optical axis; and the first side surface of the fifth lens is a convex surface, and the second side surface of the fifth lens is a concave surface at the near optical axis. It should be noted that by limiting the surface shape structures of the corresponding side surfaces of the lenses as described above, the aberration 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. In addition, it should be noted that the first side surface being a convex surface means that the first side surface forms a convex shape towards the first side of the optical imaging lens group, the first side surface being a concave surface means that the first side surface forms a concave shape towards the first side of the optical imaging lens group, the second side surface being a convex surface means that the second side surface forms a convex shape towards the second side of the optical imaging lens group, and the second side surface being a concave surface means that the second side surface forms a concave shape towards the second side of the optical imaging lens group. It should be emphasized that in other embodiments of the present application, the surface shape structures of all the lenses are not limited to be simultaneously limited as in the embodiments, and the surface shape structures of at least one lens can also be limited, such as limiting the surface shape structures of the first side surface and the second side surface of the fifth lens, and not limiting the surface shape structures of the other lenses.

[0068] Further, in some embodiments, the surface shape of the lens is not entirely concave or convex on the side surface, and the surface shape of the lens can be a compound curved surface, or the near-axis part is curved and the edge part is not curved; in particular, 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-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-axis of the lens surface.

[0069] Further, in some embodiments, the surface shape of the lens is not entirely concave or convex on the side surface, and the surface shape of the lens can be a compound curved surface, or the near-axis part is curved and the edge part is not curved; in particular, 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-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-axis of the lens surface.

[0070] Further, in some embodiments, the surface shape of the lens is not entirely concave or convex on the side surface, and the surface shape of the lens can be a compound curved surface, or the near-axis part is curved and the edge part is not curved; in particular, 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-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-axis of the lens surface.

[0071] In addition, it should be noted that the optical imaging lens group disclosed in the embodiments of the present application can optionally be provided with at least one diaphragm, which can be located before the first lens (first side), between each lens, or after the last fifth lens (second side). The diaphragm can be an aperture diaphragm or a field diaphragm, which can be used to reduce stray light and improve image display quality.

[0072] Further, in some embodiments, the optical imaging lens group in the embodiments of the present application also satisfies the following optical characteristics:

[0073] The plurality of lenses in the optical imaging lens group are arranged in sequence along the 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, i.e., the second side of the optical imaging lens group. The entrance pupil position of the optical imaging lens group corresponds to the planar image, i.e., 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 the optical imaging lens group containing six lenses, the lens surface close to the exit pupil position and opposite to the exit pupil position (i.e., the lens surface closest to the curved image) is a concave surface. The intersection of the optical axis and the concave surface forms an intersection point. The distance between the intersection point and the exit pupil position is the exit pupil distance, which is 1.5-6.0 mm, preferably 2-3.5 mm. It should be noted that by limiting the surface structure of the lens close to the curved image in the plurality of coaxial lenses of the optical imaging lens group and the corresponding exit pupil distance, it can be matched with the corresponding curved scanning image, so as to realize clear imaging from the curved image to the planar image.

[0074] In addition, it should be further explained that please continue to refer to Figure 2b :

[0075] Entrance pupil: The entrance pupil is the effective aperture of the incident light beam. It is the image formed by the aperture stop to the front optical system. It is the conjugate of the aperture stop in the object space. The entrance pupil corresponds to the exit pupil.

[0076] Entrance pupil position: The entrance pupil position is the position point of the image formed by the aperture stop to the front optical system. The calculation of the entrance pupil position is to regard the center of the aperture stop as an object point, and to perform ray tracing to the front optical system to obtain the intersection coordinates of the point on the optical axis. Usually, the distance from the first lens surface is taken as the entrance pupil distance.

[0077] 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.

[0078] Exit pupil position: The exit pupil position is the position point of the image formed by the aperture stop to the rear optical system. The calculation of the exit pupil position is to regard the center of the aperture stop as an object point, and to perform ray tracing to the rear optical system to obtain the intersection coordinates of the point on the optical axis. Usually, the distance from the last lens surface is taken as the exit pupil distance.

[0079] Measurement of exit pupil position: A point light source is set at the center of the entrance pupil position. The best imaging position of the point light source is the exit pupil position through the imaging of the designed lens.

[0080] Further specifically, as Figure 2b shown, from left to right, i.e., from the first side to the second side, in sequence are the entrance pupil (entrance pupil position), the optical imaging lens group, and the exit pupil (exit pupil position).

[0081] Example One

[0082] Figure 3 A structural schematic diagram of an optical imaging lens provided by an embodiment of the present application. The optical imaging lens comprises first lens 11, second lens 12, third lens 13, fourth lens 14 and fifth lens 15 arranged in sequence on the same optical axis from the first side (i.e., the side where the diaphragm 01 in the above figure is located) to the second side (i.e., the side where the scanning surface 02 in the above figure is located). Figure 3 Figure 3

[0083] In this embodiment, there is a gap between each 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, and 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-adhesive lenses.

[0084] The focal lengths of the first lens 11 to the fifth lens 15 from the first side to the second side are negative, negative, positive, positive and positive in sequence.

[0085] The first side surface of the first lens 11 is a convex surface, and the second side surface is a concave surface near the optical axis.

[0086] The first side surface of the second lens 12 is a convex surface near the optical axis, and the second side surface is a concave surface.

[0087] The first side surface of the third lens 13 is a convex surface near the optical axis, and the second side surface is a concave surface.

[0088] The first side surface of the fourth lens 14 is a convex surface, and the second side surface is a convex surface near the optical axis.

[0089] The first side surface of the fifth lens 15 is a convex surface, and the second side surface is a concave surface near the optical axis.

[0090] In this embodiment, the focal lengths of the first lens 11 to the fifth lens 15 in the optical imaging lens satisfy the following relationship:

[0091] f1 / f is -1.83, f2 / f is -2.30, f3 / f is 0.35, f4 / f is 1.15 and f5 / f is 2.02; wherein f1 is the focal length of the first lens 11, f2 is the focal length of the second lens 12, f3 is the focal length of the third lens 13, f4 is the focal length of the fourth lens 14, f5 is the focal length of the fifth lens 15, and f is the equivalent focal length of the optical imaging lens.

[0092] The refractive index and the dispersion coefficient of the first lens 11 to the fifth lens 15 in the optical imaging lens satisfy the following conditions respectively:

[0093] ​​n1 is 1.58, n2 is 1.76, n3 is 1.56, n4 is 1.5, and n5 is 1.61. Wherein, n1-n5 represent the refractive index of the first lens 11 to the sixth lens 15 respectively; the Abbe number of the first lens is 41.7, the Abbe number of the second lens is 27.6, the Abbe number of the third lens is 64.2, the Abbe number of the fourth lens is 69.1, and the Abbe number of the fifth lens is 60.

[0094] The optical imaging lens provided by the embodiment one has an equivalent focal length of 2.60mm, an aperture value of 1.30, a half field angle of 10 degrees, a scanning radius of 2mm, and an entrance pupil diameter of 2mm. The preferred parameters of the curvature radius, thickness, refractive index, and dispersion coefficient of each lens in the imaging of the scanning surface 02 are shown in Table 1:

[0095] Table 1: Structure parameters of the optical imaging lens in the embodiment one

[0096] Surface Lens Number Surface Form Radius of Curvature Thickness / Spacing Material Refractive Index Dispersion Coefficient 0 Imaging Plane Plane Infinity Infinity 1 Stop 01 Infinity 1 2 First Lens 11 Aspheric 2.15 1.36 1.58 41.7 3 Aspheric 0.93 0.40 4 Second Lens 12 Aspheric 1.34 1.67 1.76 27.6 5 Aspheric 0.48 0.11 6 Third Lens 13 Aspheric 0.51 1.42 1.56 64.2 7 Aspheric 3.29 0.12 8 Fourth Lens 14 Aspheric 19.96 1.09 1.5 69.1 9 Aspheric -1.59 0.10 10 Fifth Lens 15 Aspheric 1.14 1.40 1.61 60 11 Aspheric 0.93 0.50 12 Scanning Surface 02 Spherical 2

[0097] It should be noted that Table 1 is the detailed structure data of the optical imaging lens in the embodiment one, wherein the units of the curvature radius, thickness, and focal length are all millimeters, and the surfaces 0-12 represent the surfaces from the first side to the second side in sequence; the optical surface with a curvature radius of "infinity" in the imaging plane means a plane.

[0098] Further, the aspherical conic coefficients of the surfaces corresponding to the first lens 11 to the fifth lens 15 are shown in Table 2:

[0099] Table 2: Aspherical conic coefficient data of different lens surfaces in the embodiment one

[0100]

[0101]

[0102] Table 2 is the aspherical coefficient data in the embodiment one, wherein k is the conic coefficient in the aspherical curve equation, and A4 to A8 represent the 4th to 8th order aspherical coefficients of each surface.

[0103] Further, when the image light corresponding to the projection scanning surface is projected by using the above optical imaging lens, the optical transfer function curve is as shown in Figure 4 , the field curvature distortion curve is as shown in Figure 5 , and the axial chromatic aberration curve is as shown in Figure 6The 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) at different field angles, and the vertical axis chromatic aberration curve represents the chromatic aberration size perpendicular to the axial direction.

[0104] By Figures 4-6 It can be observed that the optical imaging lens group of the embodiment one has good imaging resolution in the full field of view range, small optical system distortion and chromatic aberration, and thus can clearly image the curved surface image scanned by the fiber scanner, and has good imaging effect.

[0105] Of course, in actual application, the optical imaging lens group can further include a display element and a housing, the display element can be arranged on the second side of the optical imaging lens group, and the optical imaging lens group can be installed in the housing, so that the curved surface image scanned by the image source (such as the fiber scanner) can be imaged on a plane to achieve clear imaging.

[0106] Example Two

[0107] Figure 7 A structural schematic diagram of an optical imaging lens group provided by the embodiment of the present application is shown in the figure. The optical imaging lens group includes a first lens 31, a second lens 32, a third lens 33, a fourth lens 34, and a fifth lens 35 arranged in sequence on the same optical axis from a first side (i.e., a side where the diaphragm 03 in the figure is located) to a second side (i.e., a side where the curved surface 04 in the figure is located). Figure 7 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 on the same optical axis from the first side to the second side.

[0108] In the embodiment, each 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 has a gap, and 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-adhesive lenses.

[0109] The focal lengths of the first lens 31 to the fifth lens 35 from the first side to the second side are negative, negative, positive, positive, and positive in sequence.

[0110] The first side surface of the first lens 31 is a convex surface, and the second side surface is a concave surface.

[0111] The first side surface of the second lens 32 is a convex surface near the optical axis, and the second side surface is a concave surface.

[0112] The first side surface of the third lens 33 is a convex surface near the optical axis, and the second side surface is a concave surface.

[0113] ​The first side surface of the fourth lens 34 is a convex surface, and the second side surface is a convex surface at the near optical axis.

[0114] The first side surface of the fifth lens 35 is a convex surface, and the second side surface is a concave surface at the near optical axis.

[0115] In the embodiment, the focal lengths of the first lens 31 to the fifth lens 35 in the optical imaging lens group satisfy the following relationship:

[0116] f1 / f is -3.03, f2 / f is -0.95, f3 / f is 0.35, f4 / f is 1.02, and f5 / f is 19.23; 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 group.

[0117] The refractive indices and the dispersion coefficients of the first lens 31 to the fifth lens 35 in the optical imaging lens group satisfy the following conditions respectively:

[0118] n1 is 1.57, n2 is 1.64, n3 is 1.52, n4 is 1.52, and n5 is 1.53; wherein n1-n5 represent the refractive indices of the first lens 31 to the fifth lens 35 respectively; the Abbe number of the first lens is 37.6, the Abbe number of the second lens is 28.9, the Abbe number of the third lens is 56.2, the Abbe number of the fourth lens is 56.2, and the Abbe number of the fifth lens is 55.7.

[0119] In the optical imaging lens group provided by the embodiment two, the equivalent focal length of the optical imaging lens group as a whole 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, the thickness parameter, the refractive index, and the dispersion coefficient of each lens in imaging the scanning surface 04 are shown in Table 3:

[0120] Table 3 Structure parameters of the optical imaging lens group in the embodiment two

[0121]

[0122]

[0123] It should be noted that Table 3 is the detailed structure data of the optical imaging lens group in the embodiment two, wherein the units of the curvature radius, the thickness, and the focal length are all millimeters, and the surfaces 0-12 represent the surfaces from the first side to the second side in sequence; the optical surface with the curvature radius of “infinity” in the imaging plane means a plane.

[0124] Further, the aspheric conic coefficients of the surfaces corresponding to the first lens 31 to the fifth lens 35 are shown in Table 4:

[0125] Table 4: Aspherical conic coefficients of different lens surfaces in Example 2

[0126] Surface K A4 A6 A8 2 -5.58E+00 9.53E-02 -2.46E-02 2.19E-02 3 -4.97E+00 5.25E-02 -1.24E-01 9.23E-02 4 -7.25E+00 -2.26E-01 -4.69E-04 -1.50E-01 5 -3.52E+00 -1.00E-01 3.07E-02 -2.19E-02 6 -3.60E+00 -1.46E-01 1.13E-01 -4.64E-02 7 -1.45E+02 -9.64E-02 -9.98E-03 7.99E-03 8 3.40E+01 7.73E-02 -3.04E-03 -1.05E-02 9 -7.48E-01 1.52E-02 1.75E-01 -3.77E-02 10 -1.43E+00 -1.54E-01 7.42E-02 2.83E-02 11 -4.06E-01 -1.84E+00 1.81E+00 -6.84E-01

[0127] Table 4: Aspherical conic coefficients of different lens surfaces in Example 2

[0128] Further, when the optical imaging lens group is used to project the image light corresponding to the scanning surface, the optical transfer function curve is as shown in Figure 8 , the field curvature distortion curve is as shown in Figure 9 , and the axial chromatic aberration curve is as shown in Figure 10 ; wherein the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, the field curvature distortion curve represents the F-Tan(theta) distortion value (percentage) at different field angles, and the axial chromatic aberration curve represents the size of the chromatic aberration perpendicular to the axial direction.

[0129] As can be seen from Figures 8-10 , the optical imaging lens group of Example 2 has good imaging resolution in the full field of view, small optical system distortion and chromatic aberration, and thus can clearly image the scanning surface image of the fiber scanner, and has good imaging effect.

[0130] Of course, in actual application, the optical imaging lens group can further include a display element and a housing, the display element can be arranged on the second side of the optical imaging lens group, and the optical imaging lens group can be installed in the housing, so that the curved surface image scanned by the image source (such as a fiber scanner) can be imaged on a plane to achieve clear imaging.

[0131] Example Three

[0132] Figure 11 A structural diagram of an optical imaging lens group according to an embodiment of the present application is provided. The optical imaging lens group includes a first lens 51, a second lens 52, a third lens 53, a fourth lens 54, and a fifth lens 55 arranged in sequence on the same optical axis from a first side (i.e., the side where the diaphragm 05 in Figure 11 is located) to a second side (i.e., the side where the scanning curved surface 06 in Figure 11 is located).

[0133] In the embodiment, there is a gap between every two adjacent lenses of the first lens 51, the second lens 52, the third lens 53, the fourth lens 54 and the fifth lens 55, and 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-adhesive lenses.

[0134] The focal length of the first lens 51 to the fifth lens 55 from the first side to the second side is negative, negative, positive, positive and positive in turn.

[0135] The first side surface of the first lens 51 is a convex surface, and the second side surface is a concave surface at the near optical axis.

[0136] The first side surface of the second lens 52 is a convex surface at the near optical axis, and the second side surface is a concave surface.

[0137] The first side surface and the second side surface of the third lens 53 are both convex surfaces.

[0138] The first side surface of the fourth lens 54 is a concave surface, and the second side surface is a convex surface at the near optical axis.

[0139] The first side surface of the fifth lens 55 is a convex surface, and the second side surface is a concave surface at the near optical axis.

[0140] In the embodiment, the focal length of the first lens 51 to the fifth lens 55 in the optical imaging lens group satisfies the following relationship:

[0141] f1 / f is -1.76, f2 / f is -2.77, f3 / f is 0.33, f4 / f is 2.37, and f5 / f is 4.05; 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 group.

[0142] The refractive index and the dispersion coefficient of the first lens 51 to the fifth lens 55 in the optical imaging lens group satisfy the following conditions respectively:

[0143] n1 is 1.65, n2 is 1.65, n3 is 1.51, n4 is 1.49, and n5 is 1.50. Wherein n1-n5 represent the refractive index of the first lens 51 to the fifth lens 55 respectively; the Abbe number of the first lens is 33.8, the Abbe number of the second lens is 33.8, the Abbe number of the third lens is 68.3, the Abbe number of the fourth lens is 70.4, and the Abbe number of the fifth lens is 69.

[0144] The optical imaging lens provided in the third embodiment of the present application 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, refractive index, and dispersion coefficient of each lens in the imaging of the scanning surface 06 are shown in Table 5:

[0145] Table 5 Structure parameters of the optical imaging lens in the third embodiment

[0146] Surface Lens Number Surface Form Radius of Curvature Thickness / Spacing Material Refractive Index Dispersion Coefficient 0 Imaging Plane Plane Infinity Infinity 1 Stop 05 Infinity 1 2 First Lens 51 Aspheric 2.33 1.03 1.65 33.8 3 Aspheric 1.08 0.50 4 Second Lens 52 Aspheric 1.26 1.93 1.65 33.8 5 Aspheric 0.40 0.11 6 Third Lens 53 Aspheric 0.43 1.56 1.51 68.3 7 Aspheric -3.93 0.16 8 Fourth Lens 54 Aspheric -1.71 1.17 1.49 70.4 9 Aspheric -1.33 0.10 10 Fifth Lens 55 Aspheric 0.96 1.15 1.5 69 11 Aspheric 0.71 0.50 12 Scanning Surface 06 Spherical 2

[0147] It should be noted that Table 5 is the detailed structure data of the optical imaging lens in the third embodiment, wherein the units of the curvature radius, thickness, and focal length are millimeters, and the surfaces 0-12 represent the surfaces from the first side to the second side in sequence; the optical surface with a curvature radius of “infinity” in the imaging plane refers to a plane.

[0148] Further, the aspherical conic coefficients of the surfaces corresponding to the first lens 51 to the fifth lens 55 are shown in Table 6:

[0149] Table 6 Aspherical conic coefficient data of different lens surfaces in the third embodiment

[0150]

[0151]

[0152] Table 6 is the aspherical coefficient data in the third embodiment, wherein k is the conic coefficient in the aspherical curve equation, and A4 to A8 represent the 4th to 8th order aspherical coefficients of each surface.

[0153] Further, it is tested that when the image light corresponding to the scanning surface is projected by using the above optical imaging lens, the modulation transfer function (MTF) curve is as shown in Figure 12 , the field curvature distortion curve is as shown in Figure 13 , and the axial chromatic aberration curve is as shown in Figure 14 ; wherein the modulation transfer function (MTF) curve represents the comprehensive resolution level of an optical system, the field curvature distortion curve represents the F-Tan(theta) distortion size value (percentage) under different field angles, and the axial chromatic aberration curve represents the size of the color aberration perpendicular to the axial direction.

[0154] It can be observed from Figures 12-14 that the imaging resolution of the optical imaging lens in the third embodiment is good within the full field of view, the optical system has small distortion and chromatic aberration, and therefore the optical imaging lens can clearly image the scanning surface image of the fiber scanner, and has good imaging effect.

[0155] Of course, in practical applications, the optical imaging lens group can also include display elements, housings, etc., the display elements can be arranged on the second side of the optical imaging lens group, and the optical imaging lens group can be installed in the housing, i.e., the curved image scanned by the image source (such as a fiber scanner) can be imaged on a plane to achieve clear imaging.

[0156] Example Four

[0157] Figure 15 A structural schematic diagram of an optical imaging lens group provided by an embodiment of the present application. The optical imaging lens group includes a first lens 71, a second lens 72, a third lens 73, a fourth lens 74, a fifth lens 75, and a sixth lens 76 arranged in sequence on the same optical axis from a first side (i.e., a side on which the diaphragm 07 in the above embodiment is located) to a second side (i.e., a side on which the scanning curved surface 08 in the above embodiment is located). Figure 15 Figure 15 It should be noted that the first lens 71 provided by the embodiment of the present application corresponds to an additional lens, the focal lengths of the second lens 72, the third lens 73, the fourth lens 74, the fifth lens 75, and the sixth lens 76 are positive or negative, which corresponds to the focal lengths of the five lenses defined in the claims, and the “first”, “second”, etc. in the embodiment do not have any importance or order difference of the lenses, but only distinguish different elements by naming.

[0158] In the embodiment, each 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 have a gap, and 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-adhesive lenses.

[0159] The focal lengths of the first lens 71 to the sixth lens 76 from the first side to the second side are positive, negative, negative, positive, positive, and positive in sequence.

[0160] The first side surface of the first lens 71 is concave at the near optical axis, and the second side surface is convex.

[0161] The first side surface of the second lens 72 is convex, and the second side surface is concave at the near optical axis.

[0162] The first side surface of the third lens 73 is convex at the near optical axis, and the second side surface is concave.

[0163] The first side surface and the second side surface of the fourth lens 74 are both convex.

[0164] The first side surface of the fifth lens 75 is concave, and the second side surface is convex at the near optical axis.

[0165] ​The first side surface of the sixth lens 76 is convex, and the second side surface is concave at the near optical axis.

[0166] In the embodiment, the focal lengths of the first lens 71 to the sixth lens 76 in the optical imaging lens satisfy the following relationship:

[0167] f1 / f is 5.80, f2 / f is -1.75, f3 / f is -1.85, f4 / f is 0.38, f5 / f is 6.51, and f6 / f is 1.28; 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.

[0168] The refractive indices and the dispersion coefficients of the first lens 71 to the sixth lens 76 in the optical imaging lens satisfy the following conditions respectively:

[0169] n1 is 1.63, n2 is 1.65, n3 is 1.65, n4 is 1.49, n5 is 1.49, and n6 is 1.52; wherein n1-n6 represent the refractive indices of the first lens 71 to the sixth lens 76 respectively; the Abbe number of the first lens is 58.3, the Abbe number of the second lens is 33.8, the Abbe number of the third lens is 33.8, the Abbe number of the fourth lens is 70.4, the Abbe number of the fifth lens is 70.4, and the Abbe number of the sixth lens is 67.5.

[0170] In the optical imaging lens provided by the fourth embodiment of the present application, the equivalent focal length of the optical imaging lens as a whole 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, the thickness parameter, the refractive index, and the dispersion coefficient of each lens in the imaging of the scanning curved surface 08 are shown in Table 7:

[0171] Table 7 Structure parameters of the optical imaging lens in the fourth embodiment

[0172] Surface Lens Number Surface Form Radius of Curvature Thickness / Spacing Material Refractive Index Dispersion Coefficient 0 Imaging Plane Plane Infinity Infinity 1 Stop 07 Infinity 1 2 First Lens 71 Spherical -2.94 0.81 1.63 58.3 3 Spherical -2.49 0.10 4 Second Lens 72 Aspheric 2.47 0.99 1.65 33.8 5 Aspheric 1.14 0.39 6 Third Lens 73 Aspheric 1.44 2.00 1.65 33.8 7 Aspheric 0.44 0.11 8 Fourth Lens 74 Aspheric 0.49 1.54 1.49 70.4 9 Aspheric -4.15 0.10 10 Fifth Lens 75 Aspheric -3.25 1.14 1.49 70.4 11 Aspheric -2.61 0.10 12 Sixth Lens 76 Aspheric 0.78 1.05 1.52 67.5 13 Aspheric 0.76 0.50 14 Scanning Surface 08 Spherical 2

[0173] It should be noted that Table 7 is the detailed structure data of the optical imaging lens in the fourth embodiment, wherein the units of the curvature radius, the thickness, and the focal length are all millimeters, and the surfaces 0-14 represent the surfaces from the first side to the second side in sequence; the optical surface with the curvature radius of “infinity” in the imaging plane means a plane.

[0174] Further, the aspheric conic coefficients of the surfaces corresponding to the first lens 71 to the sixth lens 76 are shown in Table 8:

[0175] Table 8 Aspheric conic coefficient data of different lens surfaces in the fourth embodiment

[0176]

[0177]

[0178] Table 8 shows the aspheric coefficient data in Example 4, where k is the conical coefficient in the aspheric curve equation, and A4 to A8 represent the 4th to 8th order aspheric coefficients of each surface.

[0179] Furthermore, tests showed that when the image light corresponding to the scanning surface is projected using the aforementioned optical imaging lens group, its optical transfer function curve is as follows: Figure 16 As shown, the field distortion curve is as follows: Figure 17 As shown, the vertical axis color difference curve is as follows: Figure 18 As shown; among them, the optical transfer function (MTF) curve represents the overall resolution level of an optical system, the field curvature distortion curve represents the F-Tan (theta) distortion magnitude (percentage) under different field angles, and the transverse chromatic aberration curve represents the magnitude of chromatic aberration in the direction perpendicular to the axis.

[0180] Depend on Figures 16-18 Observations show that the optical imaging lens group in Example 4 has good imaging resolution and small optical system distortion and chromatic aberration across the entire field of view. Therefore, the optical imaging lens group can clearly image the scanning surface image of the fiber optic scanner and has good imaging effect.

[0181] Of course, in practical applications, the optical imaging lens assembly may also include a display element, a housing, etc. The display element can be set on the second side of the optical imaging lens assembly, and the optical imaging lens assembly can be installed in the housing, so that the curved image formed by the image source (such as a fiber optic scanner) can be imaged on a plane to achieve clear imaging.

[0182] Scanning display device

[0183] The aforementioned optical imaging lens assembly can be used in conjunction with a fiber optic scanner (or a corresponding fiber optic scanning module) to constitute the scanning display device in the embodiments of this application (e.g., Figure 1a , 1b As shown, the optical imaging lens group is positioned on the output optical path of the fiber optic scanner. The first side of the optical imaging lens group faces the scanning output direction of the fiber optic scanner. Preferably, the optical imaging lens group is coaxial with the central optical axis of the fiber optic scanner. Of course, the structure and general principle of the fiber optic scanner can be found in the aforementioned... Figure 1a , 1b The corresponding content will not be elaborated on here.

[0184] Near-eye display device

[0185] In the present application, the scanning display device can be further applied to a near-eye display device, and can be combined with a near-eye display module to form a near-eye display device in the embodiments of the present application, and can be used as a head-mounted AR device (such as AR glasses). The scanning display device is arranged in the near-eye display module.

[0186] The near-eye display module can include a light source, a processing control circuit, a wearable frame structure, a waveguide, and the like. The image light beam output by the light source enters the scanning display device, is scanned by the optical fiber scanner in the scanning display device, and is output to the optical display lens group. The scanning surface (which can refer to the scanning surface 02 in FIG. 2 and the scanning surface 230 in FIG. 23) of the optical fiber scanner is converted into an imaging plane (which can refer to the imaging plane 240 in FIG. 2) after passing through the optical display lens group. The imaging plane is coupled into the waveguide as an entrance pupil surface of the waveguide, and is expanded and coupled out by the waveguide to enter the human eye. Figure 3 Figure 2a The scanning surface (which can refer to the scanning surface 02 in FIG. 2 and the scanning surface 230 in FIG. 23) of the optical fiber scanner is converted into an imaging plane (which can refer to the imaging plane 240 in FIG. 2) after passing through the optical display lens group. The imaging plane is coupled into the waveguide as an entrance pupil surface of the waveguide, and is expanded and coupled out by the waveguide to enter the human eye. Figure 2a As another possible implementation, the scanning display device can be further combined with a near-eye display module to form a near-eye display device in the embodiments of the present application, and can be used as a head-mounted VR device (such as a VR helmet / glasses). The scanning display device is arranged in the near-eye display module.

[0187] In the embodiments 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 aberration generated by the lens can be slowed down, the purpose of correcting various aberrations can be achieved, and clear imaging of the image surface can be realized on the basis of improving the field of view; by limiting and optimizing the refractive index, the dispersion coefficient and the surface structure of the five coaxial lenses, the imaging quality and the field of view are further improved; by limiting and optimizing the five coaxial lenses to be designed as aspherical surface structures, the imaging quality is further improved, and the overall structure of the optical imaging lens group is more compact, which meets the production demand of miniaturization of the lens product.

[0188] The above description is only a preferred embodiment of the present application, and each embodiment is only used to illustrate the technical solutions of the present application but not to limit the present application. Any technical solution obtained by logical analysis, reasoning or effective experiment based on the concept of the present application should be within the scope of the present application.

[0189] Each embodiment in the present application is described in a progressive manner, and the same or similar parts of each embodiment can be referred to each other. Each embodiment mainly describes the differences from other embodiments.

[0190]

[0191] ​​The expressions "first", "second", "the first", or "the second" used in various embodiments of the disclosure can modify various components regardless of order and / or importance, but the expressions do not limit the corresponding components. The above expressions are configured only for the purpose of distinguishing an element from other elements. For example, the first lens and the second lens represent different lenses, although both are lenses.

Claims

1. An optical imaging lens assembly, characterized in that, The optical imaging lens group includes at least a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged coaxially from the first side to the second side. The focal lengths of the first lens to the fifth lens are negative, negative, positive, positive, and positive, respectively. Each lens also satisfies the following relationships: -3.03≤f1 / f≤-1.76, -2.77≤f2 / f≤-0.95, 0.33≤f3 / f≤0.35, 0.91≤f4 / f≤0.97, and 8.98≤f5 / f≤19.23, 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 group. The exit pupil distance of the optical imaging lens group is 1.5-6.0 mm.

2. The optical imaging lens assembly as described in claim 1, characterized in that, The second side surface of the fifth lens is concave near the optical axis.

3. The optical imaging lens assembly as described in claim 2, characterized in that, The various lenses also satisfy the following relationships: 1.57≤n1≤1.65, 1.64≤n2≤1.76, 1.51≤n3≤1.56, 1.49≤n4≤1.52, 1.5≤n5≤1.61; where 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 the following: 33.8≤v1≤41.7, 27.6≤v2≤33.8, 56.2≤v3≤64.2, 56.2≤v4≤70.4, 56.7≤v5≤69; where 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 as described in claim 3, characterized in that, The n1 is 1.57, 1.58, or 1.65; the n2 is 1.64, 1.65, or 1.76; the n3 is 1.51, 1.52, or 1.56; the n4 is 1.49, 1.52, or 1.50; and the n5 is 1.5, 1.53, or 1.

61. The dispersion coefficients of the various lenses satisfy the following conditions: the Abbe number of the first lens is 33.8, 37.6, or 41.7; the Abbe number of the second lens is 27.6, 28.9, or 33.8; the Abbe number of the third lens is 56.2 or 64.2; the Abbe number of the fourth lens is 56.2, 69.1, or 70.4; and the Abbe number of the fifth lens is 55.7, 60, or 69.

5. The optical imaging lens assembly as described in claim 2, characterized in that, The first side surface of the fifth lens is convex; the first side surface of the fourth lens is either convex or concave, and the second side surface of the fourth lens is convex near the optical axis.

6. The optical imaging lens assembly as described in any one of claims 1 to 5, characterized in that, The first side surface of the first lens is convex, and the second side surface of the first lens is concave near the optical axis.

7. The optical imaging lens assembly as described in claim 6, characterized in that, The first side surface of the second lens is convex near the optical axis, and the second side surface of the second lens is concave; the first side surface of the third lens is convex near the optical axis, and the second side surface of the third lens is either convex or concave. The first and second side surfaces of the first lens to the fifth lens are all aspherical surface structures; The second side of the optical imaging lens group corresponds to a curved surface image, and the first side of the optical imaging lens group corresponds to a planar image.

8. A scanning display device, characterized in that, The invention includes a fiber optic scanner and an optical imaging lens group according to any one of claims 1 to 7, wherein the fiber optic scanner is used to scan and emit light to display an image, and the optical imaging lens group is used to magnify and project the scanning surface corresponding to the light emitted by the fiber optic scanner. The fiber optic scanner includes an actuator and an optical fiber fixed to the actuator. The portion of the optical fiber extending beyond the actuator forms an optical fiber cantilever, which 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 includes at least a near-eye display module and a scanning display device according to claim 8, wherein the scanning display device is disposed 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 includes at least a near-eye display module and a scanning display device according to claim 8, wherein the scanning display device is disposed in the near-eye display module.

Images