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 in the market, especially when it is applied to the near-eye display, the imaging effect and the field of view angle limit its performance in high resolution, which hinders 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 present application provides an optical imaging lens, which comprises at least a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in order from a first side to a second side and sharing an optical axis, wherein the focal lengths of the first lens to the fifth lens are negative, positive, negative, positive and positive respectively.

[0006] Optionally, the lenses satisfy the following relationship: -12.6≤f1 / f≤-1.56, 0.69≤f2 / f≤0.88, 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] Optionally, the lenses also satisfy the following relationship: -0.51≤f3 / f≤-0.35, 0.65≤f4 / f≤0.71 and 3.43≤f5 / f≤17.13, wherein f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, and f5 is the focal length of the fifth lens.

[0008] Optionally, the lenses further satisfy the following relationships: 1.56 ≤ n1 ≤ 1.73, 1.50 ≤ n2 ≤ 1.58, 1.65 ≤ n3 ≤ 1.76, 1.49 ≤ n4 ≤ 1.51, 1.49 ≤ n5 ≤ 1.64; 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.

[0009] The dispersion coefficients of the lenses satisfy: 46.4 ≤ v1 ≤ 63.8, 58.5 ≤ v2 ≤ 69, 27.6 ≤ v3 ≤ 33.8, 68.4 ≤ v4 ≤ 70.4, and 57 ≤ v5 ≤ 70.4; 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.

[0010] Optionally, the second side surface of the fifth lens is concave at the vicinity of the optical axis.

[0011] Optionally, the first side surface of the first lens is convex or concave, and the second side surface of the first lens is concave.

[0012] Optionally, the first side surface of the second lens is convex, and the second side surface of the second lens is concave or convex.

[0013] Optionally, the first side surface and the second side surface of the first lens to the fifth lens are aspherical surface structures.

[0014] 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.

[0015] The application further provides a scanning display device, which comprises a fiber scanner and the optical imaging lens as described above, the fiber scanner is used for scanning and emitting light of an image to be displayed, and the optical imaging lens is used for enlarging and imaging a scanning surface corresponding to the light emitted by the fiber scanner and projecting the scanning surface.

[0016] The fiber scanner comprises an actuator and a fiber fixed on the actuator, a part of the fiber beyond the actuator forms a fiber cantilever, and the fiber cantilever performs two-dimensional scanning under the driving of the actuator.

[0017] The application further provides a near-eye display device, which is used as a head-mounted augmented reality and / or virtual reality device and comprises at least a near-eye display module and the scanning display device as described above, the scanning display device is arranged in the near-eye display module.

[0018] The technical solutions in the embodiments of the present application can achieve the following technical effects:

[0019] In the embodiments of the present application, the focal lengths of the five coaxial lenses of the optical imaging lens group are reasonably optimized, which 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 thus realize clear imaging of the image surface on the basis of improving the field of view. At the same time, the overall structure of the optical imaging lens group is more compact through the reasonable number of lens combinations, which meets the production needs of miniaturization of the lens product.

[0020] Further, 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.

[0021] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or will be learned by practice of the present application. The objects and other advantages of the present application will be realized and achieved by the structures and / or processes particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

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

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

[0024] Figure 2a is a schematic diagram of the scanning output of the optical fiber scanner provided in the embodiments of the present application;

[0025] Figure 2b is a schematic diagram of the positional relationship between the optical imaging lens group provided in the embodiments of the present application and the entrance pupil position and exit pupil position and the corresponding exit pupil distance;

[0026] Figure 3 is a structural schematic diagram of an optical imaging lens group provided in Embodiment One of the present application;

[0027] Figure 4 is an MTF curve diagram of the optical imaging lens group in Embodiment One of the present application;

[0028] Figure 5 is a field curvature distortion curve diagram of the optical imaging lens group in Embodiment One of the present application;

[0029] Figure 6 is a sagittal chromatic aberration diagram of the optical imaging lens group in Embodiment One of the present application.

[0030] Figure 7 is a structural diagram of an optical imaging lens provided in Embodiment Two of the present application;

[0031] Figure 8 is an MTF curve diagram of the optical imaging lens in Embodiment Two of the present application;

[0032] Figure 9 is a field curvature distortion curve diagram of the optical imaging lens in Embodiment Two of the present application;

[0033] Figure 10 is a sagittal chromatic aberration diagram of the optical imaging lens in Embodiment Two of the present application;

[0034] Figure 11 is a structural diagram of an optical imaging lens provided in Embodiment Three of the present application;

[0035] Figure 12 is an MTF curve diagram of the optical imaging lens in Embodiment Three of the present application;

[0036] Figure 13 is a field curvature distortion curve diagram of the optical imaging lens in Embodiment Three of the present application;

[0037] Figure 14 is a sagittal chromatic aberration diagram of the optical imaging lens in Embodiment Three of the present application;

[0038] Figure 15 is a structural diagram of an optical imaging lens provided in Embodiment Four of the present application;

[0039] Figure 16 is an MTF curve diagram of the optical imaging lens in Embodiment Four of the present application;

[0040] Figure 17 is a field curvature distortion curve diagram of the optical imaging lens in Embodiment Four of the present application;

[0041] Figure 18 is a sagittal chromatic aberration diagram of the optical imaging lens in Embodiment Four of the present application;

[0042] Figure 19 is a structural diagram of an optical imaging lens provided in Embodiment Five of the present application;

[0043] Figure 20 is an MTF curve diagram of the optical imaging lens in Embodiment Five of the present application;

[0044] Figure 21 is a field curvature distortion curve diagram of the optical imaging lens in Embodiment Five of the present application;

[0045] Figure 22 is a sagittal chromatic aberration diagram of the optical imaging lens in Embodiment Five of the present application. DETAILED DESCRIPTION

[0046] The application will be further described below in detail with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are intended to be illustrative only and are not intended to limit the scope of the application. In addition, it should be noted that only the parts related to the application are shown in the drawings for the convenience of description.

[0047] Illustrative scanning display system

[0048] 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 of fiber scanning imaging and the corresponding system are described below.

[0049] As shown in FIG. 1, it is an illustrative scanning display system in the present application, which mainly includes: Figure 1a

[0050] 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,

[0051] 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.

[0052] When the system works, the processor 100 can control the light source modulation circuit 140 to modulate the laser group 110 according to the image data to be displayed. The laser group 110 includes a plurality of monochromatic lasers, which respectively emit light beams of different colors. As can be seen from FIG. 1, the laser group can specifically use Red (R), Green (G) and Blue (B) three-color 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.

[0053] 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.

[0054] ​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.

[0055] 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.

[0056] 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.

[0057] 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 called the first side, and the side corresponding to the scanning curved surface 230 of the optical imaging lens group is called the second side. In the subsequent content, the embodiments of the optical imaging lens group are described by taking “the first side” and “the 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.

[0058] It should be further explained that 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. 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 images.

[0059] Optical imaging lens

[0060] 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, positive, negative, 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.

[0061] Further specifically preferably, the various lenses satisfy the following relationships: -12.6≤f1 / f≤-1.56, 0.69≤f2 / f≤0.88, -0.51≤f3 / f≤-0.35, 0.65≤f4 / f≤0.71, and 3.43≤f5 / f≤17.13; 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 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 compact by controlling the focal length and surface structure of the five lenses.

[0062] 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.

[0063] Further, in a possible implementation, the above lens also satisfies the following relationship:

[0064] 1.56≤n1≤1.73, 1.50≤n2≤1.58, 1.65≤n3≤1.76, 1.49≤n4≤1.51, and 1.49≤n5≤1.64; 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 1.56 or 1.61 or 1.73, n2 is 1.50 or 1.52 or 1.58, n3 is 1.65 or 1.76, n4 is 1.49 or 1.50 or 1.51, and n5 is 1.49 or 1.57 or 1.64. 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.

[0065] Further optionally, in order to better ensure the imaging quality, the embodiment of the present application further preferably limits the dispersion coefficients of the five lenses, and the dispersion coefficients of the various lenses satisfy: 46.4≤v1≤63.8, 58.5≤v2≤69, 27.6≤v3≤33.8, 68.4≤v4≤70.4, and 57≤v5≤70.4; 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 46.4 or 49.4 or 51.6 or 60.9 or 63.8, the Abbe number of the second lens is preferably 58.5 or 58.6 or 60.2 or 67.1 or 69, the Abbe number of the third lens is preferably 27.6 or 33.8, the Abbe number of the fourth lens is preferably 68.4 or 69.1 or 70.4, and the Abbe number of the fifth lens is preferably 57 or 63 or 69.7 or 70.4. 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 embodiment 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.

[0066] Further optionally, in one possible implementation, the first side surface of the first lens is a convex surface or a concave surface, the second side surface of the first lens is a concave surface; the first side surface of the second lens is a convex surface, and the second side surface of the second lens is a concave surface or a convex surface; and the second side surface of the fifth lens is a concave surface near the 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 embodiment, 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.

[0067] 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.

[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] 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.

[0071] Further, in some embodiments, the optical imaging lens group in the embodiments of the present application also satisfies the following optical characteristics:

[0072] The plurality of lenses in the optical imaging lens group are sequentially 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, i.e., corresponds to 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., corresponds to the first side of the optical imaging lens group. It should be noted that please refer to Figures 1a-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 in the plurality of lenses (i.e., the lens surface closest to the curved image) is a concave surface. The optical axis and the concave surface intersect to form an intersection point. The distance between the intersection point and the exit pupil position is the exit pupil distance. The exit pupil distance is 1.5-6.0 mm, and preferably, the exit pupil distance is 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 on-axis lenses of the optical imaging lens group and the corresponding exit pupil distance, it can be matched with the corresponding curved scanning image, so that clear imaging from the curved image to the planar image is realized.

[0073] In addition, it should be further explained that please continue to refer to Figure 2b

[0074] 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.

[0075] 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, to perform ray tracing to the front optical system, to obtain the intersection point coordinates of the point on the optical axis, and to take the distance from the surface of the first lens as the entrance pupil distance.

[0076] 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.

[0077] 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, to perform ray tracing to the rear optical system, to obtain the intersection point coordinates of the point on the optical axis, and to take the distance from the surface of the last lens as the exit pupil distance.

[0078] Measurement of the exit pupil position: A point light source is arranged 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.

[0079] Further specifically, as Figure 2b shown, from left to right, i.e., from the first side to the second side, they are in turn the entrance pupil (entrance pupil position), the optical imaging lens group, and the exit pupil (exit pupil position). ​

[0080] Example One

[0081] 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 FIG. 1 is located) to the second side (i.e., the side where the scanning surface 02 in FIG. 1 is located). Figure 3 Figure 3

[0082] 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.

[0083] The focal lengths of the first lens 11 to the fifth lens 15 from the first side to the second side are negative, positive, negative, positive and positive in sequence.

[0084] The first side surface of the first lens 11 is a convex surface, and the second side surface is a concave surface.

[0085] The first side surface of the second lens 12 is a convex surface, and the second side surface is a convex surface.

[0086] The first side surface of the third lens 13 is a concave surface, and the second side surface is a concave surface near the optical axis.

[0087] 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.

[0088] 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.

[0089] 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:

[0090] f1 / f is -12.62, f2 / f is 0.88, f3 / f is -0.41, f4 / f is 0.66 and f5 / f is 6.54; 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.

[0091] 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:

[0092] ​​n1 is 1.69, n2 is 1.58, n3 is 1.76, n4 is 1.51, and n5 is 1.64. Wherein, n1-n5 represent the refractive index of the first lens 11 to the fifth lens 15 respectively; the Abbe number of the first lens is 49.4, the Abbe number of the second lens is 58.6, the Abbe number of the third lens is 27.6, the Abbe number of the fourth lens is 68.4, and the Abbe number of the fifth lens is 57.

[0093] The optical imaging lens group 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:

[0094] Table 1 Structure parameters of the optical imaging lens group in embodiment one

[0095] 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 20.13 0.86 1.69 49.4 3 Aspheric 10.54 1.09 4 Second Lens 12 Aspheric 1.45 1.23 1.58 58.6 5 Aspheric -10.43 0.27 6 Third Lens 13 Aspheric -61.30 0.60 1.76 27.6 7 Aspheric 0.83 0.36 8 Fourth Lens 14 Aspheric 9.92 1.19 1.51 68.4 9 Aspheric -0.93 0.10 10 Fifth Lens 15 Aspheric 1.08 0.78 1.64 57 11 Aspheric 0.86 0.50 12 Scanning Surface 02 Spherical 2

[0096] It should be noted that Table 1 is the detailed structure data of the optical imaging lens group in embodiment one, wherein the units of the curvature radius, thickness, and spacing are all millimeters, and the surfaces 0-12 represent the surfaces from the first side to the second side in order; the optical surface with a curvature radius of "infinity" in the imaging plane means a plane.

[0097] Further, the aspherical conic coefficients of the surfaces corresponding to the first lens 11 to the fifth lens 15 are shown in Table 2:

[0098] Table 2 Aspherical conic coefficient data of different lens surfaces in embodiment one

[0099] Surface K A4 A6 A8 2 2.49E+02 -3.60E-02 1.02E-02 -1.81E-03 3 -2.73E+02 -6.95E-02 1.86E-02 -1.71E-04 4 -1.93E+00 7.61E-03 -1.93E-02 -1.00E-02 5 6.84E+01 2.53E-01 -3.23E-01 1.04E-01 6 4.03E+03 -1.27E-01 6.86E-03 3.42E-02 7 -4.96E+00 -3.92E-01 3.06E-01 -8.73E-02 8 -2.24E+02 -2.59E-01 3.75E-01 -1.61E-01 9 -2.56E+00 1.36E-02 2.56E-01 -1.03E-01 10 2.44E-01 -1.17E-02 1.64E-01 -2.60E-01 11 4.02E-01 -1.46E+00 2.36E+00 -3.22E+00

[0100] Table 2 is the aspherical coefficient data in 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.

[0101] Further, when the image light corresponding to the projection scanning surface is projected by using the above optical imaging lens group, 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 6 ; wherein the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, the field curvature distortion curve represents the F-Tan(theta) distortion size value (percentage) under different field angles, and the axial chromatic aberration curve represents the size of the chromatic aberration perpendicular to the axial direction.

[0102] By Figures 4-6 From the observation, the optical imaging lens of the embodiment one has good imaging resolution, small optical system distortion and chromatic aberration in the full field of view range, so the optical imaging lens can clearly image the curved surface image scanned by the fiber scanner, and has good imaging effect.

[0103] Of course, in actual application, the optical imaging lens can also include a display element and a shell, the display element can be arranged on the second side of the optical imaging lens, and the optical imaging lens can be installed in the shell, 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.

[0104] Embodiment two

[0105] Figure 7 A structural schematic diagram of an optical imaging lens provided by the embodiment of the present application. The optical imaging lens 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 above embodiment is located) to a second side (i.e., a side where the scanning curved surface 04 in the above embodiment is located). Figure 7 Figure 7 In the above 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 have 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.

[0106] In the above 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 have 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.

[0107] The focal lengths of the first lens 31 to the fifth lens 35 from the first side to the second side are negative, positive, negative, positive, and positive in sequence.

[0108] The first side surface of the first lens 31 is a convex surface, and the second side surface is a concave surface.

[0109] The first side surface and the second side surface of the second lens 32 are both convex surfaces.

[0110] The first side surface of the third lens 33 is a convex surface, and the second side surface is a concave surface.

[0111] The first side surface of the fourth lens 34 is a concave surface near the optical axis, and the second side surface is a convex surface.

[0112] The first side surface of the fifth lens 35 is a convex surface, and the second side surface is a concave surface near the optical axis.

[0113] In the above embodiment, the focal lengths of the first lens 31 to the fifth lens 35 in the optical imaging lens satisfy the following relationship:

[0114] ​f1 / f is -3.85, f2 / f is 0.79, f3 / f is -0.46, f4 / f is 0.71, and f5 / f is 6.88; 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.

[0115] The refractive indices and dispersion coefficients of the first lens 31 to the fifth lens 35 in the optical imaging lens satisfy the following conditions respectively:

[0116] n1 is 1.67, n2 is 1.58, n3 is 1.76, n4 is 1.49, and n5 is 1.49; 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 51.6, the Abbe number of the second lens is 60.2, the Abbe number of the third lens is 27.6, the Abbe number of the fourth lens is 70.4, and the Abbe number of the fifth lens is 69.7.

[0117] In the optical imaging lens provided by the second 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, thickness parameter, refractive index, and dispersion coefficient of each lens in imaging the scanning surface 04 are shown in Table 3:

[0118] Table 3 Structure parameters of the optical imaging lens in the second embodiment

[0119] Surface Lens Number Surface Form Radius of Curvature Thickness / Spacing Material Refractive Index Dispersion Coefficient 0 Imaging Plane Plane Infinity Infinity 1 Stop 03 Infinity 1 2 First Lens 31 Aspheric 13.68 1.52 1.67 51.6 3 Aspheric 4.31 0.38 4 Second Lens 32 Aspheric 1.22 1.11 1.58 60.2 5 Aspheric -62.80 0.31 6 Third Lens 33 Aspheric 33.94 0.60 1.76 27.6 7 Aspheric 0.89 0.51 8 Fourth Lens 34 Aspheric -6.90 1.02 1.49 70.4 9 Aspheric -0.84 0.10 10 Fifth Lens 35 Aspheric 0.82 0.78 1.49 69.7 11 Aspheric 0.62 0.50 12 Scanning Surface 04 Spherical 2

[0120] It should be noted that Table 3 is the detailed structure data of the optical imaging lens in the second embodiment, wherein the units of the curvature radius, thickness, and interval are millimeters, and surfaces 0-12 represent the surfaces from the first side to the second side in order; the optical surface with a curvature radius of "infinity" in the imaging plane means a plane.

[0121] Further, the aspheric conic coefficients of the surfaces corresponding to the first lens 31 to the fifth lens 35 are shown in Table 4:

[0122] Table 4 Aspheric conic coefficient data of different lens surfaces in the second embodiment

[0123] Surface K A4 A6 A8 2 1.09E+02 -1.91E-03 1.14E-02 -4.71E-03 3 -5.41E+01 -5.24E-02 3.61E-02 -6.39E-04 4 -2.30E+00 1.32E-02 4.20E-03 -1.37E-02 5 4.00E+02 2.48E-01 -3.43E-01 1.10E-01 6 6.98E+02 -1.47E-01 3.49E-03 3.44E-02 7 -4.99E+00 -3.24E-01 2.58E-01 -1.13E-01 8 -4.00E+02 -3.51E-01 2.81E-01 -1.86E-01 9 -2.09E+00 -1.11E-01 1.27E-01 -5.08E-02 10 -1.94E-01 -5.41E-02 1.02E-01 -1.03E-01 11 -4.17E-01 -1.65E+00 2.23E+00 -1.14E+00

[0124] Table 4 is the aspheric coefficient data in the second embodiment, wherein k is the conic coefficient in the aspheric curve equation, and A4 to A8 represent the 4th to 8th order aspheric coefficients of each surface.

[0125] 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 8 As shown, the field distortion curve is as follows: Figure 9 As shown, the vertical axis color difference curve is as follows: Figure 10 As shown; where the MTF plot represents the overall resolution of an optical system, the field curvature distortion curve plot represents the F-Tan (theta) distortion magnitude (percentage) under different field angles, and the transverse chromatic aberration curve plot represents the chromatic aberration magnitude in the direction perpendicular to the axial direction.

[0126] Depend on Figures 8-10 Observations show that the optical imaging lens group of Example 2 has good imaging resolution and small optical system distortion and chromatic aberration across the entire field of view. Therefore, the optical imaging lens group can clearly image the scanning surface image of the fiber optic scanner and has good imaging effect.

[0127] 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.

[0128] Example 3

[0129] Figure 11 This is a schematic diagram of an optical imaging lens assembly provided in an embodiment of the present invention. The optical imaging lens assembly includes a first side (i.e., Figure 11 From the side where aperture 05 is located (to the second side, that is, Figure 11 The first lens 51, the second lens 52, the third lens 53, the fourth lens 54, and the fifth lens 55 are arranged sequentially along the common optical axis on the side where the scanning surface 06 is located.

[0130] In this embodiment, there is a gap between each pair of adjacent lenses in 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-bonded lenses.

[0131] The focal lengths of the first lens 51 to the fifth lens 55, from the first side to the second side, are negative, positive, negative, positive, and positive, respectively.

[0132] The first side surface of the first lens 51 is convex, and the second side surface is concave.

[0133] The first side surface of the second lens 52 is convex, and the second side surface is concave.

[0134] The first side surface of the third lens 53 is convex, and the second side surface is concave.

[0135] The first side surface of the fourth lens 54 is convex at the near optical axis, and the second side surface is convex.

[0136] The first side surface of the fifth lens 55 is convex, and the second side surface is concave at the near optical axis.

[0137] In the embodiment, the focal lengths of the first lens 51 to the fifth lens 55 in the optical imaging lens group satisfy the following relationship:

[0138] f1 / f is -1.56, f2 / f is 0.69, f3 / f is -0.51, f4 / f is 0.65, and f5 / f is 17.13; 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.

[0139] The refractive indices and the dispersion coefficients of the first lens 51 to the fifth lens 55 in the optical imaging lens group satisfy the following conditions respectively:

[0140] n1 is 1.73, n2 is 1.57, n3 is 1.76, n4 is 1.5, and n5 is 1.57; wherein n1-n5 represent the refractive indices of the first lens 51 to the fifth lens 55 respectively; the Abbe number of the first lens is 46.4, the Abbe number of the second lens is 58.5, the Abbe number of the third lens is 27.6, the Abbe number of the fourth lens is 69.1, and the Abbe number of the fifth lens is 63.

[0141] In the optical imaging lens group provided by the embodiment three, 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 06 are shown in Table 5:

[0142] Table 5 Structure parameters of the optical imaging lens group in the embodiment three

[0143] 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 10.33 2.00 1.73 46.4 3 Aspheric 2.09 0.46 4 Second Lens 52 Aspheric 0.96 1.39 1.57 58.5 5 Aspheric 7.56 0.31 6 Third Lens 53 Aspheric 4.75 0.60 1.76 27.6 7 Aspheric 0.78 0.34 8 Fourth Lens 54 Aspheric 22.26 1.09 1.5 69.1 9 Aspheric -0.86 0.10 10 Fifth Lens 55 Aspheric 1.05 0.87 1.57 63 11 Aspheric 0.76 0.50 12 Scanning Surface 06 Spherical 2

[0144] It should be noted that Table 5 is the detailed structure data of the optical imaging lens group in the embodiment three, wherein the units of the curvature radius, the thickness, and the interval are 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.

[0145] Further, the aspheric conic coefficients of the surfaces corresponding to the first lens 51 to the fifth lens 55 are shown in Table 6:

[0146] Table 6. Aspheric conic coefficient data for different lens surfaces in Example 3.

[0147] Surface K A4 A6 A8 2 4.09E+01 -1.30E-02 1.30E-02 -4.62E-03 3 -1.51E+01 -6.28E-02 4.70E-02 -1.11E-02 4 -2.27E+00 2.53E-02 2.82E-03 -7.30E-03 5 -3.77E+02 2.37E-01 -3.23E-01 1.53E-01 6 -2.11E+02 -1.69E-01 1.68E-02 7.41E-02 7 -5.36E+00 -2.83E-01 2.06E-01 -5.66E-02 8 3.03E+02 -3.28E-01 3.31E-01 -1.46E-01 9 -2.00E+00 -1.04E-01 1.17E-01 -3.64E-02 10 -7.87E-01 -3.84E-02 9.43E-02 -2.35E-01 11 -4.75E-01 -1.60E+00 1.18E+00 -5.71E-01

[0148] Table 6 shows the aspheric coefficient data in Example 3, 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.

[0149] Furthermore, tests showed that when the image light corresponding to the scanning surface is projected using the aforementioned optical imaging lens group, its optical transfer function curve is as follows: Figure 12 As shown, the field distortion curve is as follows: Figure 13 As shown, the vertical axis color difference curve is as follows: Figure 14 As shown; where the MTF plot represents the overall resolution of an optical system, the field curvature distortion curve plot represents the F-Tan (theta) distortion magnitude (percentage) under different field angles, and the transverse chromatic aberration curve plot represents the chromatic aberration magnitude in the direction perpendicular to the axial direction.

[0150] Depend on Figures 12-14 Observations show that the optical imaging lens group in Example 3 has good imaging resolution, small optical system distortion and chromatic aberration across the entire field of view. Therefore, the optical imaging lens group can clearly image the scanning surface image of the fiber optic scanner and has good imaging effect.

[0151] 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.

[0152] Example 4

[0153] Figure 15 This is a schematic diagram of an optical imaging lens assembly provided in an embodiment of the present invention. The optical imaging lens assembly includes a first side (i.e., Figure 15 From the side where aperture 07 is located to the second side (that is, Figure 15 The first lens 71, the second lens 72, the third lens 73, the fourth lens 74, and the fifth lens 75 are arranged sequentially along the common optical axis on the side where the scanning surface 08 is located.

[0154] In this embodiment, there is a gap between each pair of adjacent lenses in the first lens 71, the second lens 72, the third lens 73, the fourth lens 74, and the fifth lens 75. The first lens 71, the second lens 72, the third lens 73, the fourth lens 74, and the fifth lens 75 are five single non-bonded lenses.

[0155] The first lens 71 to the fifth lens 75 have, in order from the first side to the second side, a focal length of negative, positive, negative, positive, and positive.

[0156] The first side surface and the second side surface of the first lens 71 are both concave.

[0157] The first side surface and the second side surface of the second lens 72 are both convex.

[0158] The first side surface of the third lens 73 is concave, and the second side surface is concave at the near optical axis.

[0159] The first side surface of the fourth lens 74 is concave at the near optical axis, and the second side surface is convex.

[0160] The first side surface of the fifth lens 75 is convex, and the second side surface is concave at the near optical axis.

[0161] In the present embodiment, the focal lengths of the first lens 71 to the fifth lens 75 in the optical imaging lens group satisfy the following relationship:

[0162] f1 / f is -2.72, f2 / f is 0.76, f3 / f is -0.35, f4 / f is 0.70, and f5 / f is 3.43; 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, and f is the equivalent focal length of the optical imaging lens group.

[0163] The refractive indices and the dispersion coefficients of the first lens 71 to the fifth lens 75 in the optical imaging lens group satisfy the following conditions, respectively:

[0164] n1 is 1.61, n2 is 1.52, n3 is 1.65, n4 is 1.49, and n5 is 1.49; wherein n1-n5 represent the refractive indices of the first lens 71 to the fifth lens 75, respectively; the Abbe number of the first lens is 60.9, the Abbe number of the second lens is 67.1, the Abbe number of the third lens is 33.8, the Abbe number of the fourth lens is 70.4, and the Abbe number of the fifth lens is 70.4.

[0165] In the optical imaging lens group provided by the fourth embodiment of the present application, 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 curved surface 08 are shown in Table 7:

[0166] Table 7 Structure parameters of the optical imaging lens group in the fourth embodiment

[0167] 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 Aspheric -9.28 1.14 1.61 60.9 3 Aspheric 8.56 0.58 4 Second Lens 72 Aspheric 1.33 2.00 1.52 67.1 5 Aspheric -2.27 0.22 6 Third Lens 73 Aspheric -8.53 0.64 1.65 33.8 7 Aspheric 0.66 0.39 8 Fourth Lens 74 Aspheric -46.69 1.04 1.49 70.4 9 Aspheric -0.89 0.10 10 Fifth Lens 75 Aspheric 0.87 0.87 1.49 70.4 11 Aspheric 0.73 0.50 12 Scanning Surface 08 Spherical 2

[0168] It is to be noted that Table 7 is the detailed structure data of the optical imaging lens set of Example 4, wherein the units of the curvature radius, thickness and interval are millimeters, and 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.

[0169] Further, the aspheric conic coefficients of the surfaces corresponding to the first lens 71 to the fifth lens 75 are shown in Table 8 as follows:

[0170] Table 8: Aspheric conic coefficients of different lens surfaces in Example 4

[0171] Surface K A4 A6 A8 2 -1.64E+02 -2.36E-02 2.20E-02 -7.16E-03 3 -1.92E+01 -8.24E-02 3.42E-02 -7.69E-03 4 -2.27E+00 1.31E-02 -7.43E-03 -5.38E-03 5 -1.65E+01 1.86E-01 -3.25E-01 1.63E-01 6 -1.41E+01 -1.75E-01 1.52E-02 1.09E-01 7 -4.16E+00 -3.02E-01 2.16E-01 -6.41E-02 8 1.35E+03 -3.22E-01 2.90E-01 -1.92E-01 9 -1.62E+00 -8.47E-02 1.26E-01 -4.35E-02 10 -6.01E-01 -5.12E-02 1.78E-01 -1.53E-01 11 -3.65E-01 -1.49E+00 1.35E+00 -9.93E-01

[0172] In Table 8, k is the conic coefficient in the aspheric curve equation, and A4 to A8 represent the 4th to 8th order aspheric coefficients of each surface.

[0173] Further, when the image light corresponding to the scanning surface of the optical fiber scanner is projected by using the optical imaging lens set, the optical transfer function curve is as shown in Figure 16 , the field curvature distortion curve is as shown in Figure 17 , and the axial chromatic aberration curve is as shown in Figure 18 ; wherein the MTF curve represents the comprehensive resolution level of an optical system, the field curvature distortion curve represents the F-Tan(theta) distortion value (percentage) under different field angles, and the axial chromatic aberration curve represents the size of the chromatic aberration perpendicular to the axial direction.

[0174] From the observation of Figures 16-18 , it can be seen that the imaging resolution of the optical imaging lens set of Example 4 is good in the full field of view, the optical system distortion and chromatic aberration are small, and therefore the optical imaging lens set can clearly image the scanning surface image of the optical fiber scanner, and all have good imaging effect.

[0175] Of course, in actual application, the optical imaging lens set can further include a display element and a shell, the display element can be arranged on the second side of the optical imaging lens set, and the optical imaging lens set can be installed in the shell, so that the curved surface image scanned by the image source (such as the optical fiber scanner) can be imaged on a plane to achieve clear imaging.

[0176] Example 5

[0177] Figure 19 A structure diagram of an optical imaging lens set provided by the embodiment of the present application. The optical imaging lens set includes a first side (i.e., a side where the diaphragm 09 in Figure 19 is located) to a second side (i.e., a side where the image plane 10 in Figure 19The additional lens 96, the first lens 91, the second lens 92, the third lens 93, the fourth lens 94, and the fifth lens 95 are arranged in sequence on the same optical axis (on the side of the scanning curved surface 10 in the optical imaging lens group 90).

[0178] In the present embodiment, there is a gap between each two adjacent lenses among the additional lens 96, the first lens 91, the second lens 92, the third lens 93, the fourth lens 94, and the fifth lens 95, and the additional lens 96, the first lens 91, the second lens 92, the third lens 93, the fourth lens 94, and the fifth lens 95 are six single non-adhesive lenses.

[0179] The focal lengths of the additional lens 96 to the fifth lens 95 from the first side to the second side are positive, negative, positive, negative, positive, and positive in sequence.

[0180] The first side surface of the additional lens 96 is a concave surface, and the second side surface is a convex surface.

[0181] The first side surface and the second side surface of the first lens 91 are both concave surfaces.

[0182] The first side surface of the second lens 92 is a convex surface, and the second side surface is a convex surface near the optical axis.

[0183] The first side surface of the third lens 93 is a concave surface, and the second side surface is a concave surface near the optical axis.

[0184] The first side surface of the fourth lens 94 is a convex surface near the optical axis, and the second side surface is a convex surface.

[0185] The first side surface of the fifth lens 95 is a convex surface, and the second side surface is a concave surface near the optical axis.

[0186] In the present embodiment, the focal lengths of the lenses in the optical imaging lens group satisfy the following relationship:

[0187] f1 / f is -4.33, f2 / f is 0.80, f3 / f is -0.33, f4 / f is 0.73, f5 / f is 2.57, and f6 / f is 30.60; 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, f6 is the focal length of the additional lens 96, and f is the equivalent focal length of the optical imaging lens group.

[0188] The refractive indices and dispersion coefficients of the lenses in the optical imaging lens group satisfy the following conditions respectively:

[0189] n1 is 1.56, n2 is 1.5, n3 is 1.65, n4 is 1.49, n5 is 1.49, and n6 is 1.52. In the present embodiment, n1-n6 represent the refractive indexes of the first lens 91 to the additional lens 96, respectively; the Abbe number of the first lens is 63.8, the Abbe number of the second lens is 69, 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 additional lens is 66.9.

[0190] In the optical imaging lens provided by the fifth embodiment of the present application, the equivalent focal length of the optical imaging lens 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, refractive index, and dispersion coefficient of each lens in the imaging of the scanning surface 10 are shown in Table 9:

[0191] Table 9 Structure parameters of the optical imaging lens in the fifth embodiment

[0192] Surface Lens Number Surface Form Radius of Curvature Thickness / Spacing Material Refractive Index Dispersion Coefficient 0 Imaging Plane Plane Infinity Infinity 1 Stop 09 Infinity 1 2 Additional Lens 96 Spherical -4.59 1.01 1.52 66.9 3 Spherical -4.45 0.47 4 First Lens 91 Aspheric -7.33 0.60 1.56 63.8 5 Aspheric 50.00 0.40 6 Second Lens 92 Aspheric 1.40 1.87 1.5 69 7 Aspheric -2.25 0.20 8 Third Lens 93 Aspheric -5.75 0.68 1.65 33.8 9 Aspheric 0.66 0.39 10 Fourth Lens 94 Aspheric 28.77 1.03 1.49 70.4 11 Aspheric -0.95 0.10 12 Fifth Lens 95 Aspheric 0.78 0.82 1.49 70.4 13 Aspheric 0.67 0.50 14 Scanning Surface 10 Spherical 2

[0193] It should be noted that Table 9 is the detailed structure data of the optical imaging lens in the fifth embodiment, wherein the units of the curvature radius, thickness, and interval are millimeters, and surfaces 0-14 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.

[0194] Further, the aspheric conic coefficients of the surfaces corresponding to the first lens 91 to the fifth lens 95 are shown in Table 10:

[0195] Table 10 Aspheric conic coefficient data of different lens surfaces in the fifth embodiment

[0196] Surface K A4 A6 A8 4 -1.16E+02 -2.85E-02 1.98E-02 -8.76E-03 5 -4.00E+02 -8.68E-02 3.06E-02 -8.40E-03 6 -2.53E+00 8.09E-03 -7.99E-03 -4.75E-03 7 -1.91E+01 1.75E-01 -3.26E-01 1.66E-01 8 -5.00E+00 -1.78E-01 1.15E-02 9.49E-02 9 -4.18E+00 -3.05E-01 2.08E-01 -1.01E-01 10 -4.00E+02 -3.13E-01 2.78E-01 -2.03E-01 11 -1.77E+00 -8.27E-02 1.20E-01 -3.86E-02 12 -2.80E-01 -7.26E-02 1.27E-01 -1.21E-01 13 -6.24E-01 -9.20E-01 1.64E+00 -7.58E-01

[0197] Table 10 is the aspheric coefficient data in the fifth embodiment, wherein k is the conic coefficient in the aspheric curve equation, and A4 to A8 represent the 4th to 8th order aspheric coefficients of each surface.

[0198] 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 20 , the field curvature distortion curve is as shown in Figure 21 , and the axial chromatic aberration curve is as shown in Figure 22 ; wherein the MTF graph represents the comprehensive resolution level of an optical system, the field curvature distortion curve represents the F-Tan(theta) distortion size value (percentage) under different field angles, and the axial chromatic aberration curve represents the size of the chromatic aberration perpendicular to the axial direction.

[0199] FromFigures 20-22 It can be observed that the optical imaging lens group of Example Five has good imaging resolution, small optical system distortion and small chromatic aberration in the full field of view range, and thus can clearly image the curved surface image scanned by the fiber scanner, and has good imaging effect.

[0200] 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.

[0201] Scanning display device

[0202] The optical imaging lens group described above can be combined with a fiber scanner (or a corresponding fiber scanning module) to form a scanning display device in the embodiments of the present application (such as a fiber scanning display device as shown in Figure 1a 、 1b The optical imaging lens group is arranged on the light path of the fiber scanner), wherein the first side of the optical imaging lens group faces the scanning direction of the fiber scanner, and the preferred mode is that the optical imaging lens group is coaxial with the central optical axis of the fiber scanner. Of course, the structure and general principle of the fiber scanner can refer to the corresponding content of the foregoing Figure 1a 、 1b , and thus will not be described in detail here.

[0203] Near-eye display device

[0204] 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.

[0205] 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 fiber scanner in the scanning display device, and is output to the optical display lens group. The scanning curved surface (which can refer to the scanning curved surface 02 in Figure 3 and the corresponding scanning curved surface 230 in Figure 2a ) of the fiber scanner is converted into an imaging plane (which can refer to the imaging plane 240 in Figure 2a ) after the optical display lens group, the imaging plane is coupled into the waveguide as an entrance pupil surface of the waveguide, and then is expanded and coupled out by the waveguide to enter the human eye.

[0206] As another possible implementation, the scanning display device can further be configured into the near-eye display module as the near-eye display device in the embodiments of the present application, and used as a head-mounted VR device (e.g., a VR helmet / glasses). The scanning display device is arranged in the near-eye display module.

[0207] 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 achieved 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 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 requirements of miniaturization of the lens product.

[0208] The above are only preferred embodiments 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, and any technical solution obtained by logical analysis, reasoning or effective experiment according to the concept of the present application should be within the scope of the present application.

[0209] Each embodiment in the present application is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other, and each embodiment mainly describes the difference from other embodiments.

[0210] The expressions "first", "second", "the first" or "the second" used in various embodiments of the present disclosure can modify various components regardless of order and / or importance, but these expressions do not limit the corresponding components. The above expressions are only configured for the purpose of distinguishing the elements from other elements. For example, the first lens and the second lens represent different lenses, although both are lenses.

Claims

1. An optical imaging lens 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, positive, negative, positive, and positive, respectively; -12.6≤f1 / f≤-1.56, 0.69≤f2 / f≤0.88, -0.51≤f3 / f≤-0.35, 0.65≤f4 / f≤0.71, and 3.43≤f5 / f≤17.13, 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, f is the focal length of the optical imaging lens group, and the exit pupil distance of the optical imaging lens group is 1.5-6.0mm.

2. The optical imaging lens assembly as described in claim 1, characterized in that, Each of the lenses also satisfies the following relationships: 1.56≤n1≤1.73, 1.50≤n2≤1.58, 1.65≤n3≤1.76, 1.49≤n4≤1.51, 1.49≤n5≤1.64; 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 each lens satisfy the following conditions: 46.4≤v1≤63.8, 58.5≤v2≤69, 27.6≤v3≤33.8, 68.4≤v4≤70.4, 57≤v5≤70.4; 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.

3. 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.

4. The optical imaging lens assembly as described in claim 3, characterized in that, The first side surface of the first lens is either convex or concave, and the second side surface of the first lens is concave.

5. The optical imaging lens assembly as described in claim 3, characterized in that, The first side surface of the second lens is convex, and the second side surface of the second lens is either concave or convex.

6. The optical imaging lens assembly as described in claim 1, characterized in that, 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.

7. 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 6, 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.

8. A near-eye display device, characterized in that, The near-eye display device is used as a head-mounted augmented reality and / or virtual reality device, and includes at least a near-eye display module and a scanning display device according to claim 7, wherein the scanning display device is disposed in the near-eye display module.

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