Optical imaging lens group and scanning display device

Abstract

The utility model discloses an optical imaging lens group, a scanning display device and application, and relates to the technical field of scanning display. The focal lengths corresponding to the first lens to the third lens of the optical imaging lens group provided by the utility model are negative, positive and positive respectively, and the focal lengths corresponding to the fourth lens to the sixth lens are negative, positive and negative or positive, negative and negative respectively. The focal lengths of the six lenses with the same optical axis of the optical imaging lens group are reasonably optimized and set, so that the focal power of the system can be reasonably dispersed, the aberration generated by the lenses can be reduced, the aim of correcting various aberrations can be fulfilled, and the clear imaging of an image space curved surface can be realized. By configuring the optical imaging lens group in an optical fiber scanner, a miniaturized and lightweight scanning display device can be formed, and the scanning display device is configured and applied to the field of vehicle-mounted projection, so that the requirements of large visual angle, high resolution and low distortion of vehicle-mounted projection can be met.

Description

Technical Field

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

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

[0003] However, existing scanning display imaging systems have shortcomings such as poor imaging quality, small field of view angle, and the inability to be both miniaturized and lightweight. As a result, the scanning display imaging technology is subject to certain restrictions in the process of market promotion and application. Especially when scanning display imaging is applied to vehicle-mounted projection scenarios, it is easy to have problems such as low resolution and large distortion due to the product's inability to match the scanning light source of the laser fiber well, and the performance requirements of miniaturization and lightweight are also difficult to achieve. Utility Model Content

[0004] The purpose of the present application is to provide an optical imaging lens group and a scanning display device to meet the requirements for product form diversification, miniaturization and lightness in vehicle-mounted projection scenarios.

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

[0006] The present application provides an optical imaging lens assembly, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens which are arranged on a common optical axis in sequence from the second side to the first side, wherein the focal lengths corresponding to the first lens to the third lens are negative, positive, and positive, respectively, and the focal lengths corresponding to the fourth lens to the sixth lens are negative, positive, negative, or positive, negative, and negative, respectively.

[0007] Furthermore, in a preferred embodiment of the present application, the minimum negative lens in the optical imaging lens assembly and the total focal length of the optical imaging lens assembly have the following ratio relationship: 0.54≤|f 最小负 / f 总 |≤1.21, where f 最小负 is the focal length of the smallest negative lens, f 总 is the total focal length of the optical imaging lens assembly.

[0008] Furthermore, in a preferred embodiment of the present application, the third lens, the fifth lens and the sixth lens are all cemented lenses combining a positive lens and a negative lens, the refractive index of the positive lens in the third lens and the fifth lens is smaller than the refractive index of the negative lens, and the refractive index of the positive lens in the sixth lens is larger than the refractive index of the negative lens.

[0009] Furthermore, in a preferred embodiment of the present application, the third lens, the fifth lens and the sixth lens satisfy at least one of the following conditions: the difference in refractive index between the negative lens and the positive lens in the third lens is 0.19-0.37; the difference in refractive index between the negative lens and the positive lens in the fifth lens is 0.04-0.24; the difference in refractive index between the positive lens and the negative lens in the sixth lens is 0.03-0.29.

[0010] Further, in a preferred embodiment of the present application, the negative lens in the sixth lens is closer to the first side than the positive lens.

[0011] Furthermore, in a preferred embodiment of the present application, the surface of the first side of the optical imaging lens assembly is a concave surface.

[0012] Furthermore, in a preferred embodiment of the present application, the second side corresponds to a curved surface image at the light source end, the curved surface image is formed by the configuration of the optical fiber scanner, and the surface of the second side of the optical imaging lens assembly is a concave surface.

[0013] Furthermore, in a preferred embodiment of the present application, the achromatic ability Z of the glued lens is n It is expressed by the following formula:

[0014] Where n is 3, 5, 6, Z n represents the achromatic ability of the nth lens, f n_1 and f n_2 Ab represents the focal length of the positive lens and the negative lens corresponding to the cemented lens; n_1 and Ab n_2 It represents the Abbe number of the positive lens and the negative lens corresponding to the cemented lens; the achromatic power Z3 of the third lens is -0.065 to -0.029, the achromatic power Z5 of the fifth lens is -0.1343 to -0.0605, and the achromatic power Z6 of the sixth lens is -0.4958 to -0.09.

[0015] The present application also provides a scanning display device, which includes a fiber scanner and the aforementioned optical imaging lens group, wherein the fiber scanner is used to scan and emit light of an image to be displayed, and the optical imaging lens group is used to magnify, image and project a scanning surface corresponding to the light emitted by the fiber scanner; wherein the fiber scanner includes an actuator and an optical fiber fixed to the actuator, and the portion of the optical fiber that exceeds the actuator forms a fiber cantilever, and the fiber cantilever performs two-dimensional scanning under the drive of the actuator.

[0016] The present application also provides an application of the scanning display device as described above, which includes: configuring the scanning display device in the field of vehicle-mounted display.

[0017] The following technical effects can be achieved by using the technical solution in the embodiments of the present application:

[0018] In the embodiment of the present application, by reasonably optimizing the focal lengths of the six coaxial lenses of the optical imaging lens group, the optical power of the system can be reasonably dispersed, the aberrations generated by the lenses can be mitigated, the purpose of correcting multiple aberrations can be achieved, and clear imaging of the image side curved surface can be achieved; by limiting the ratio of the focal length of the smallest negative lens among the multiple lenses to the total focal length of the optical imaging lens group, the imaging quality of the optical imaging lens group is further guaranteed; in addition, by arranging multiple cemented lenses and reasonably setting their distribution positions, spherical aberration and chromatic aberration in the imaging structure are further eliminated, and the field curvature of the optical imaging lens group is balanced, thereby ensuring the imaging quality of the optical imaging lens group.

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

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

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

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

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

[0024] Figure 2b is a schematic structural diagram of an optical imaging lens assembly provided in an embodiment of the present application;

[0025] Figure 2c is a schematic diagram of the working distance of the optical imaging lens assembly provided in an embodiment of the present application;

[0026] Figure 3 is a schematic structural diagram of an optical imaging lens assembly provided in Example 1 of the present application;

[0027] Figure 4is an MTF curve diagram of the optical imaging lens assembly in Example 1 of the present application;

[0028] Figure 5 is a field curvature distortion curve diagram of the optical imaging lens assembly in the first embodiment of the present application;

[0029] Figure 6 is a vertical axis chromatic aberration diagram of the optical imaging lens assembly in Example 1 of the present application;

[0030] Figure 7 is a structural schematic diagram of an optical imaging lens assembly provided in Example 2 of the present application;

[0031] Figure 8 is an MTF curve diagram of the optical imaging lens assembly in the second embodiment of the present application;

[0032] Fig. 9 is a field curvature distortion curve diagram of the optical imaging lens assembly in the second embodiment of the present application;

[0033] Fig.10 is a vertical axis chromatic aberration diagram of the optical imaging lens assembly in Example 2 of the present application;

[0034] Fig.11 is a schematic structural diagram of an optical imaging lens assembly provided in Embodiment 3 of the present application;

[0035] Fig.12 is an MTF curve diagram of the optical imaging lens assembly in the third embodiment of the present application;

[0036] Fig.13 is a field curvature distortion curve diagram of the optical imaging lens assembly in the third embodiment of the present application;

[0037] Fig.14 is a vertical axis chromatic aberration diagram of the optical imaging lens assembly in Example 3 of the present application;

[0038] Fig.15 is a schematic structural diagram of an optical imaging lens assembly provided in Embodiment 4 of the present application;

[0039] Fig.16 is an MTF curve diagram of the optical imaging lens assembly in the fourth embodiment of the present application;

[0040] Fig.17 is a field curvature distortion curve diagram of the optical imaging lens assembly in the fourth embodiment of the present application;

[0041] Fig.18 is a vertical axis chromatic aberration diagram of the optical imaging lens assembly in the fourth embodiment of the present application;

[0042] Fig.19 is a structural schematic diagram of an optical imaging lens assembly provided in Example 5 of the present application;

[0043] Fig. 20 is an MTF curve diagram of the optical imaging lens assembly in Example 5 of the present application;

[0044] Fig.21 is a field curvature distortion curve diagram of the optical imaging lens assembly in Example 5 of the present application;

[0045] Fig. 22 4 is a diagram of vertical axis chromatic aberration of the optical imaging lens assembly in Example 5 of the present application.

[0046] Icons: 100-processor; 110-laser group; 120-fiber scanning module; 130-transmission fiber; 140-light source modulation circuit; 150-scanning drive circuit; 160-beam combining unit; 121-scanning actuator; 121a-slow axis; 121b-fast axis; 122-fiber cantilever; 123-mirror group; 124-scanner packaging shell; 125-fixing part; 230-scanning surface; 240-imaging plane; 01-surface image. DETAILED DESCRIPTION

[0047] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the related application, rather than to limit the application. It is also necessary to explain that, for ease of description, only the parts related to the related application are shown in the accompanying drawings.

[0048] Illustrative Scanning Display System

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

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

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

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

[0053] When the system is working, the processor 100 can control the light source modulation circuit 140 to modulate the laser group 110 according to the image data to be displayed. The laser group 110 includes multiple monochromatic lasers, which emit light beams of different colors. As can be seen from FIG1 , the laser group can specifically use three-color lasers: red (Red, R), green (Green, G), and blue (Blue, B). The light beams emitted by the lasers in the laser group 110 are combined into a laser beam by the beam combining unit 160 and coupled into the transmission optical fiber 130.

[0054] The processor 100 may also control the scanning driving circuit 150 to drive the optical fiber scanner in the optical fiber scanning module 120 to scan, thereby scanning and outputting the light beam transmitted in the transmission optical fiber 130 .

[0055] The light beam output by the optical fiber scanner acts on a certain pixel position on the surface of the medium, and forms a light spot at the pixel position, thereby realizing the scanning of the pixel position. Driven by the optical fiber scanner, the output end of the transmission optical fiber 130 sweeps along a certain scanning trajectory, so that the light beam moves to the corresponding pixel position. In the actual scanning process, the light beam output by the transmission optical fiber 130 will form a light spot with corresponding image information (such as color, grayscale or brightness) at each pixel position. In one frame of time, the light beam traverses each pixel position at a sufficiently high speed to complete the scanning of one frame of image. Due to the characteristic of "visual residual" when the human eye observes things, the human eye cannot perceive the movement of the light beam at each pixel position, but sees a complete frame of image.

[0056] Continue to refer Figure 1b , is a specific structure of the optical fiber scanning module 120, which includes: a scanning actuator 121, an optical fiber cantilever 122, a mirror assembly 123, a scanner package 124 and a fixing member 125. The scanning actuator 121 is fixed in the scanner package 124 by the fixing member 125. The transmission optical fiber 130 extends from the front end of the scanning actuator 121 to form an optical fiber cantilever 122 (also called a scanning optical fiber). When working, the scanning actuator 121 is driven by a scanning driving signal, and its slow axis 121a (also called a first actuating portion) moves along a vertical direction (the vertical direction is parallel to Figure 1a , 1bThe Y-axis in the reference coordinate system (in this application, the vertical direction may also be referred to as the first direction) vibrates, and its fast axis 121b (also referred to as the second actuating portion) vibrates along the horizontal direction (the horizontal direction is parallel to Figure 1a , 1b The optical fiber cantilever 122 is driven by the scanning actuator 121 to perform two-dimensional scanning according to a preset trajectory and emit a light beam, and the emitted light beam can be scanned and imaged through the lens group 123. Generally, the structure formed by the scanning actuator 121 and the optical fiber cantilever 122 can be called an optical fiber scanner.

[0057] like Figure 2a As shown, in the embodiment of the present application, the movement trajectory of the light-emitting end of the optical fiber forms a scanning surface 230 through the movement of the fast and slow axes, and is converted into an imaging plane 240 after passing through the corresponding lens group 123 (when imaging on a planar carrier, the image is a plane. It should be noted that in other embodiments of the present application, the image formed after passing through the lens group 123 can correspond to the surface of the imaging carrier, that is, it can change with the shape of the carrier surface, as long as the image is clear).

[0058] In order to facilitate description and enable those skilled in the art to easily understand the solution of the present application, it should be noted that the optical imaging lens assembly (such as Figure 2a The lens group 123 shown in the figure is used as an eyepiece. Through the action of the optical imaging lens group, the scanning surface 230 can be converted into an imaging plane 240 (in actual application, the transmission direction of the light is: from the scanning surface 230 to the imaging plane 240).

[0059] It should be further explained that, in the field of projection, the image corresponding to the imaging end is a plane image, and the corresponding plane image carrier can be a projection screen, a curtain, a ground, a glass surface or a wall, etc. The image corresponding to the light source end is a curved surface image, that is, an arc-shaped scanning surface scanned by a fiber optic scanner or emitted by other image sources; in the usage scenario of the camera field, the optical path is opposite to that in the projection field. The light source end generally corresponds to the object side for collecting image information, and the imaging end generally corresponds to the image side obtained by collecting imaging.

[0060] Optical imaging lens

[0061] Please refer to Figure 2bThe optical imaging lens group in the embodiment of the present application is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are arranged on the same optical axis in sequence from the second side to the first side. The focal lengths corresponding to the first lens to the third lens are negative, positive and positive respectively, and the focal lengths corresponding to the fourth lens to the sixth lens are negative, positive, negative or positive, negative and negative respectively. It should be noted that in the embodiment of the present application, by reasonably optimizing the positive and negative focal lengths of the six lenses on the same optical axis of the optical imaging lens group, the optical power of the system can be reasonably dispersed, the aberrations generated by the lenses can be mitigated, the purpose of correcting various aberrations can be achieved, and clear imaging of the image side curved surface can be achieved.

[0062] Furthermore, the minimum negative lens in the optical imaging lens assembly and the total focal length of the optical imaging lens assembly have the following ratio relationship: 0.54≤|f 最小负 / f 总 |≤1.21, where f 最小负 is the focal length of the smallest negative lens, f 总 It should be noted that by limiting the ratio of the focal length of the smallest negative lens among the plurality of lenses to the total focal length of the optical imaging lens assembly, the focal length of the entire optical imaging lens assembly system is reasonably dispersed and configured, thereby strengthening the correction of various aberrations and further ensuring the imaging quality of the optical imaging lens assembly.

[0063] Further optionally, in some embodiments of the present application, the third lens, the fifth lens and the sixth lens are all cemented lenses combining a positive lens and a negative lens, wherein the refractive index of the positive lens in the third lens and the fifth lens is less than the refractive index of the negative lens, and the refractive index of the positive lens in the sixth lens is greater than the refractive index of the negative lens. It should be noted that the refractive index of the positive lens in the third lens and the fifth lens is less than the refractive index of the negative lens, which can effectively eliminate spherical aberration and chromatic aberration in the imaging process, and the refractive index of the positive lens in the sixth lens is greater than the refractive index of the negative lens, which is used to balance the field curvature of the system, thereby ensuring the imaging quality.

[0064] Further optionally, in some embodiments of the present application, the third lens, the fifth lens and the sixth lens satisfy at least one of the following conditions: the difference in refractive index between the negative lens and the positive lens in the third lens is 0.19 to 0.37; the difference in refractive index between the negative lens and the positive lens in the fifth lens is 0.04 to 0.24; the difference in refractive index between the positive lens and the negative lens in the sixth lens is 0.03 to 0.29. It should be noted that by setting the difference in refractive index between the negative lens and the positive lens in the third lens and the fifth lens within a more preferred range, spherical aberration and chromatic aberration in the imaging process can be further eliminated, and at the same time, the difference in refractive index between the positive lens and the negative lens in the sixth lens is set within a more preferred range, which is used to balance the field curvature of the system and further improve the imaging quality.

[0065] Further optionally, in some embodiments of the present application, the negative lens in the sixth lens is closer to the first side than the positive lens. It should be noted that after the light emitted by the curved image is diverged and converged by multiple lenses, the negative lens corresponding to the sixth lens diverges the converged light, which can ensure that the light converges in the same plane, while eliminating spherical aberration and chromatic aberration in the imaging process, thereby ensuring the imaging quality.

[0066] Further optionally, in some embodiments of the present application, the surface of the first side of the optical imaging lens group is a concave surface. By setting the surface of the first side as a concave surface, although the optical imaging lens group will produce certain spherical aberration and chromatic aberration during the imaging process, the spherical aberration and chromatic aberration generated here are within the error range and will not have much impact on the resolution of the imaging. Since the image at the light source end is a curved image, this means that the field curvature that exists when the imaging optical module converts the curved image into a flat image will seriously affect the resolution of the imaging, and setting the surface of the first side as a concave surface here can greatly correct the field curvature of the system, thereby making the final imaging clearer.

[0067] Further optionally, reference Figure 2c In some embodiments of the present application, the second side corresponds to the curved image at the light source end, and optionally, the curved image is formed by the configuration of the optical fiber scanner, and the surface of the second side of the optical imaging lens group is a concave surface. It should be noted that the surface of the second side of the optical imaging lens group is a concave surface, and the curved image and the concave surface of the second side are oriented in the same direction, so that the lens closest to the curved image can be well adapted to the curved image, which is conducive to receiving light with a large viewing angle, so that the information from the curved image can be more comprehensively and fully captured. It should be emphasized that the uniqueness of the optical imaging lens group provided in the embodiments of the present application is that it can correct the curved image imaging corresponding to the light source end of the second side to obtain a clear image (i.e., on the first side).

[0068] Further optionally, in some embodiments of the present application, the achromatic ability Z of the cemented lens is n It is expressed by the following formula:

[0069] Where n is 3, 5, 6, Z n represents the achromatic ability of the nth lens, f n_1 and f n_2 Ab represents the focal length of the positive lens and the negative lens corresponding to the cemented lens; n_1 and Ab n_2Indicates the Abbe number of the positive lens and the negative lens corresponding to the cemented lens; the achromatic ability Z3 of the third lens is -0.065 to -0.029, the achromatic ability Z5 of the fifth lens is -0.1343 to -0.0605, and the achromatic ability Z6 of the sixth lens is -0.4958 to -0.09. It should be noted that the closer the achromatic ability of the cemented lens is to 0, the higher the ability of the cemented lens to eliminate chromatic aberration. Here, by limiting the achromatic ability of the third lens and the fifth lens to 0, the spherical aberration and chromatic aberration in the imaging process can be effectively eliminated. Furthermore, although the achromatic ability of the sixth lens is weak, it can effectively balance the field curvature of the system, thereby ensuring the imaging quality.

[0070] It should be further explained that the optical imaging lens assembly disclosed in the embodiment of the present application may optionally be provided with at least one aperture, which may be located at the light source end, between the lenses or at the imaging end. The aperture may be of an aperture aperture or a field aperture, etc., which may be used to reduce stray light and help improve the image display quality. Furthermore, at least one aperture in the embodiment of the present application is provided on the first side of the optical imaging lens assembly, that is, the aperture is provided on the side of the sixth lens away from the fifth lens.

[0071] Furthermore, in a possible implementation manner, the multiple lenses may be connected in an interval manner or bonded together in an adhesive manner, which will be determined according to the needs of the actual application and is not limited here.

[0072] Further optionally, in a possible implementation, multiple lenses are made of plastic or glass. It should be noted that lenses made of plastic can effectively reduce production costs. Compared with glass materials, the cost of plastic lenses is one twentieth to one tenth of the cost of glass, so it is very conducive to low-cost mass production; in addition, plastic lenses can usually be injection molded, which has low processing difficulty and can be easily processed into various surface structures that meet aspheric surfaces. At the same time, plastic materials can also reduce the weight of the lens as a whole, which is conducive to its lightweight product design. When using glass materials, the refractive index of glass materials is higher and wider, and it has advantages in correcting lens aberrations; the expansion coefficient of glass materials is much smaller, which is conducive to precision assembly. In addition, due to the characteristics of glass itself such as high temperature resistance, UV resistance, and acid and alkali resistance, the service life and performance stability of the lens group have strong advantages. Of course, it should be emphasized that in other embodiments of the present application, it is not limited to the two materials of plastic and glass provided in the embodiments of the present application, and it can also be other materials that can make lenses.

[0073] Embodiment 1

[0074] Figure 3This is a schematic diagram of the structure of an optical imaging lens assembly provided in Example 1. The optical imaging lens assembly includes six lenses arranged in sequence along the optical axis, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the second side to the first side on the same optical axis. It should be noted that the focal lengths corresponding to the first lens to the sixth lens in the optical imaging lens assembly of this embodiment are negative, positive, positive, negative, positive, and negative, respectively.

[0075] Furthermore, the second side of the optical imaging lens assembly of this embodiment corresponds to the curved surface image 01 at the light source end, the lens numerical aperture (NA) of the optical imaging lens assembly is 0.27 mm, the total focal length is 1.6 mm, the exit pupil diameter is 0.896 mm, the working distance is 0.64 mm, and the full field of view angle is 36 degrees. It should be noted that, referring to Figure 2c The working distance in the embodiments of this specification refers to the distance between the concave surface of the second side of the optical mirror set and the curved surface image on the optical axis.

[0076] In the embodiment of the present description, the optical imaging lens group further includes an aperture, and the aperture can be located on the first side of the optical imaging lens group, wherein the side of the optical imaging lens group close to the aperture is a concave surface, that is, the side of a sub-lens corresponding to the sixth lens (i.e., the negative lens L6_2 in this embodiment) close to the aperture is a concave surface. Further, the distance d between the side of the negative lens L6_2 corresponding to the sixth lens close to the aperture and the aperture on the optical axis is 2 mm. It should be noted that the distance between the side of the negative lens L6_2 corresponding to the sixth lens close to the aperture and the aperture on the optical axis refers to the maximum distance between the concave surface and the aperture on the optical axis.

[0077] In this embodiment, the smallest negative lens in the optical imaging lens assembly and the total focal length of the optical imaging lens assembly have the following ratio relationship: 最小负 / f 总 =-0.98. It should be noted that, in the embodiments of the present specification, the first to sixth lenses correspond to lenses L1 to L6, respectively, wherein the third lens L3, the fifth lens L5 and the sixth lens L6 are all cemented lenses composed of a positive lens and a negative lens, the third lens L3 includes a negative lens L3_1 and a positive lens L3_2, the fifth lens L5 includes a positive lens L5_1 and a negative lens L5_2, and the sixth lens L6 includes a positive lens L6_1 and a negative lens L6_2. 最小负 is the focal length of the smallest negative lens (i.e., the negative lens in the sixth lens in this embodiment), f 总is the total focal length of the optical imaging lens group. In addition, in the embodiments of the present specification, the smallest negative lens in the optical imaging lens group refers to the smallest negative lens among the sub-lenses corresponding to a single lens (e.g., the first lens, the second lens, the fourth lens) and a cemented lens (e.g., the third lens, the fifth lens, and the sixth lens). In some alternative embodiments, the order of the positive lens and the negative lens corresponding to the third lens L3 and the fifth lens L5 along the optical axis can be adjusted. For example, the order of the negative lens L3_1 and the positive lens L3_2 in the third lens L3 can be interchanged. For another example, the order of the positive lens L5_1 and the negative lens L5_2 in the fifth lens L5 can be interchanged. The definition of the smallest negative lens and the order of the distribution of the positive lens and the negative lens corresponding to the third lens and the fifth lens are applicable to all embodiments of the present specification and will not be repeated in other embodiments.

[0078] In this embodiment, the relationship between the focal length of each lens and the total focal length of the lens is shown in Table 1:

[0079] Table 1 Parameter table of the relationship between the focal length of each lens and the total focal length of the lens in this embodiment

[0080]

[0081] Further, in the embodiment of the present application, the preferred parameters of the curvature radius, thickness parameter, refractive index and Abbe number of each lens of the optical imaging lens assembly for imaging the curved image 01 are shown in Table 2:

[0082] Table 2 Structural parameters of the optical imaging lens assembly in Example 1

[0083] surface Lens number Face shape Radius of curvature thickness Material refractive index Abbe number Surface Image 01 - 0.64 1 L1 Spherical -1.20 2.01 2.00 25.40 2 -3.47 0.10 3 L2 Spherical -6.25 1.56 1.77 49.60 4 -3.06 0.10 5 L3_1 Spherical 9.34 0.50 1.92 18.90 6 L3_2 Spherical 4.17 1.84 1.73 54.60 7 -8.30 0.47 8 L4 Spherical -4.43 0.50 1.85 23.80 9 -10.96 0.10 10 L5_1 Spherical 5.27 2.34 1.77 49.60 11 L5_2 Spherical -3.48 0.50 1.81 25.50 12 17.02 0.10 13 L6_1 Spherical 2.85 1.91 1.95 18.00 14 L6_2 Spherical 13.30 0.63 1.67 32.20 15 0.97 2.00 Aperture unlimited - Flat image unlimited

[0084] It should be noted that Table 2 is the detailed structural data of the optical imaging lens assembly of Example 1, wherein the units of the radius of curvature, thickness and focal length are all in millimeters, and the order of surfaces 1-15 represents the surfaces from the second side to the first side; the optical surface with an infinite radius of curvature in the imaging plane is a flat surface. According to the contents of Table 2, in the cemented lens of this example, the difference in refractive index between the negative lens L3_1 and the positive lens L3_2 of the third lens L3 is 0.19, the difference in refractive index between the negative lens L5_2 and the positive lens L5_1 of the fifth lens L5 is 0.04, and the difference between the positive lens L6_1 and the negative lens L6_2 of the sixth lens L6 is 0.28.

[0085] Further, according to the contents of Table 1 and Table 2, the achromatic power Z3 of the third lens L3 is -0.029, the achromatic power Z5 of the fifth lens L5 is -0.0934, and the achromatic power Z6 of the sixth lens L6 is -0.1834.

[0086] Furthermore, after testing, when the above optical imaging lens assembly is used to project the image light corresponding to the scanning surface, the optical transfer function curve is as follows: Figure 4 As shown, the field curvature distortion curve is as follows Figure 5 As shown, the vertical axis chromatic aberration curve is as follows Figure 6 As shown; among them, the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, the field curvature distortion curve represents the F-Tan (theta) distortion value (percentage) under different field angles, and the vertical axis chromatic aberration curve represents the chromatic aberration size perpendicular to the axial direction.

[0087] Depend on Figure 4-Figure 6 It can be observed that the optical imaging lens assembly of Example 1 has good imaging resolution in the full field of view, and small optical system distortion and chromatic aberration, so the optical imaging lens assembly can clearly image the scanned curved surface image of the optical fiber scanner and has good imaging effect.

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

[0089] Embodiment 2

[0090] Figure 7 A schematic diagram of the structure of an optical imaging lens assembly provided in Example 2. The optical imaging lens assembly includes six lenses arranged in sequence along the optical axis, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the second side to the first side on the same optical axis. It should be noted that the focal lengths corresponding to the first lens to the sixth lens in the optical imaging lens assembly of this embodiment are negative, positive, positive, positive, negative, and negative, respectively.

[0091] Furthermore, the second side of the optical imaging lens group of this embodiment corresponds to the curved surface image 01 at the light source end. The lens numerical aperture (NA) of the optical imaging lens group is 0.27 mm, the total focal length is 1.62 mm, the exit pupil diameter is 0.86 mm, the working distance is 0.4 mm, and the full field of view angle is 36 degrees.

[0092] In the embodiment of the present description, the optical imaging lens assembly further includes an aperture, which may be located at a first side of the optical imaging lens assembly, wherein the side surface of the optical imaging lens assembly close to the aperture is a concave surface, that is, the side surface of a sub-lens corresponding to the sixth lens (i.e., the negative lens L6_2 in this embodiment) close to the aperture is a concave surface. Further, the distance d between the side surface of the negative lens L6_2 corresponding to the sixth lens close to the aperture and the aperture on the optical axis is 2.1 mm.

[0093] In this embodiment, the smallest negative lens in the optical imaging lens assembly and the total focal length of the optical imaging lens assembly have the following ratio relationship: 最小负 / f 总 =-1.07.

[0094] The relationship parameters between the focal length of each lens and the total focal length of the lens in this embodiment are shown in Table 3:

[0095] Table 3 Parameter table of the relationship between the focal length of each lens and the total focal length of the lens in this embodiment

[0096]

[0097] Further, in the embodiment of the present application, the preferred parameters of the curvature radius, thickness parameter, refractive index and Abbe number of each lens of the optical imaging lens assembly for imaging the curved image 01 are shown in Table 4:

[0098] Table 4 Structural parameters of the optical imaging lens assembly in Example 2

[0099] surface Lens number Face shape Radius of curvature thickness Material refractive index Abbe number Surface Image 01 - 0.64 1 L1 Spherical -0.94 1.32 2.00 25.40 2 -2.32 0.14 3 L2 Spherical -5.59 2.21 1.91 35.24 4 -3.10 0.08 5 L3_2 Spherical 10.01 1.77 1.59 68.34 6 L3_1 Spherical -3.46 0.46 1.95 17.99 7 -12.38 0.08 8 L4 Spherical 5.02 1.29 1.77 49.58 9 unlimited 0.55 10 L5_2 Spherical -4.63 1.08 1.85 23.78 11 L5_1 Spherical 6.33 1.77 1.61 56.67 12 -4.07 0.08 13 L6_1 Spherical 2.39 1.63 1.95 17.99 14 L6_2 Spherical 4.04 0.46 1.74 28.29 15 0.94 2.10 Aperture unlimited - Flat image unlimited

[0100] It should be noted that Table 4 is the detailed structural data of the optical imaging lens assembly of Example 2, wherein the units of the radius of curvature, thickness and focal length are all in millimeters, and surfaces 1-15 represent the surfaces from the second side to the first side in sequence; the optical surface with an infinite radius of curvature in the imaging plane is a flat surface. According to the contents of Table 2, in the cemented lens of this example, the difference in refractive index between the negative lens L3_1 and the positive lens L3_2 of the third lens L3 is 0.35, the difference in refractive index between the negative lens L5_2 and the positive lens L5_1 of the fifth lens L5 is 0.24, and the difference between the positive lens L6_1 and the negative lens L6_2 of the sixth lens L6 is 0.21.

[0101] Further, according to the contents of Table 3 and Table 4, the achromatic power Z3 of the third lens L3 is -0.029, the achromatic power Z5 of the fifth lens L5 is -0.0934, and the achromatic power Z6 of the sixth lens L6 is -0.1834.

[0102] Furthermore, after testing, when the above optical imaging lens assembly is used to project the image light corresponding to the scanning surface, the optical transfer function curve is as follows: Figure 8As shown, the field curvature distortion curve is as follows Fig. 9 As shown, the vertical axis chromatic aberration curve is as follows Fig.10 As shown; among them, the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, the field curvature distortion curve represents the F-Tan (theta) distortion value (percentage) under different field angles, and the vertical axis chromatic aberration curve represents the chromatic aberration size perpendicular to the axial direction.

[0103] Depend on Figure 8-Figure 10 It can be observed that the optical imaging lens assembly of Example 2 has good imaging resolution in the full field of view, and small optical system distortion and chromatic aberration. Therefore, the optical imaging lens assembly can clearly image the scanned curved surface image of the optical fiber scanner and has good imaging effect.

[0104] Of course, in practical applications, the optical imaging lens group may also include a display element, a shell, etc. The display element may be disposed on a first side of the optical imaging lens group, and the optical imaging lens group may be installed in the shell, so that a curved surface image formed by scanning an image source (such as a fiber optic scanner) can be imaged on a plane to achieve clear imaging.

[0105] Embodiment 3

[0106] Fig.11 A schematic diagram of the structure of an optical imaging lens assembly provided in Example 3. The optical imaging lens assembly includes six lenses arranged in sequence along the optical axis, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the second side to the first side on the same optical axis. It should be noted that the focal lengths corresponding to the first lens to the sixth lens in the optical imaging lens assembly of this embodiment are negative, positive, positive, positive, negative, and negative, respectively.

[0107] Furthermore, the second side of the optical imaging lens group of this embodiment corresponds to the curved surface image 01 at the light source end. The lens numerical aperture (NA) of the optical imaging lens group is 0.27 mm, the total focal length is 1.62 mm, the exit pupil diameter is 1 mm, the working distance is 0.46 mm, and the full field of view angle is 36 degrees.

[0108] In the embodiment of the present disclosure, the optical imaging lens assembly further includes an aperture, which may be located at a first side of the optical imaging lens assembly, wherein the side surface of the optical imaging lens assembly close to the aperture is a concave surface, that is, the side surface of a sub-lens corresponding to the sixth lens (i.e., the negative lens L6_2 in this embodiment) close to the aperture is a concave surface. Further, the distance d between the side surface of the negative lens L6_2 corresponding to the sixth lens close to the aperture and the aperture on the optical axis is 1.78 mm.

[0109] In this embodiment, the smallest negative lens in the optical imaging lens assembly and the total focal length of the optical imaging lens assembly have the following ratio relationship: 最小负 / f 总 =-0.63.

[0110] The relationship parameters between the focal lengths of the lenses and the total focal length of the lenses in this embodiment are shown in Table 5:

[0111] Table 5 Parameter table of the relationship between the focal length of each lens and the total focal length of the lens in this embodiment

[0112]

[0113] Further, in the embodiment of the present application, the preferred parameters of the curvature radius, thickness parameter, refractive index and Abbe number of each lens of the optical imaging lens assembly for imaging the curved image 01 are shown in Table 6:

[0114] Table 6 Structural parameters of the optical imaging lens assembly in Example 3

[0115]

[0116]

[0117] It should be noted that Table 6 is the detailed structural data of the optical imaging lens assembly of Example 3, wherein the units of the radius of curvature, thickness and focal length are all in millimeters, and surfaces 1-15 represent the surfaces from the second side to the first side in sequence; the optical surface with an infinite radius of curvature in the imaging plane is a flat surface. According to the content of Table 6, in the cemented lens of this example, the refractive index difference between the negative lens L3_1 and the positive lens L3_2 of the third lens L3 is 0.35, the refractive index difference between the negative lens L5_2 and the positive lens L5_1 of the fifth lens L5 is 0.05, and the difference between the positive lens L6_1 and the negative lens L6_2 of the sixth lens L6 is 0.11.

[0118] Further, according to the contents of Table 5 and Table 6, the achromatic power Z3 of the third lens L3 is -0.0389, the achromatic power Z5 of the fifth lens L5 is -0.1343, and the achromatic power Z6 of the sixth lens L6 is -0.39984.

[0119] Furthermore, after testing, when the above optical imaging lens assembly is used to project the image light corresponding to the scanning surface, the optical transfer function curve is as follows: Fig.12 As shown, the field curvature distortion curve is as follows Fig.13 As shown, the vertical axis chromatic aberration curve is as follows Fig.14As shown; among them, the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, the field curvature distortion curve represents the F-Tan (theta) distortion value (percentage) under different field angles, and the vertical axis chromatic aberration curve represents the chromatic aberration size perpendicular to the axial direction.

[0120] Depend on Figure 12-14 It can be observed that the optical imaging lens assembly of Example 3 has good imaging resolution in the full field of view, and small optical system distortion and chromatic aberration. Therefore, the optical imaging lens assembly can clearly image the scanned curved surface image of the optical fiber scanner and has good imaging effect.

[0121] Of course, in practical applications, the optical imaging lens group may also include a display element, a shell, etc. The display element may be disposed on a first side of the optical imaging lens group, and the optical imaging lens group may be installed in the shell, so that a curved surface image formed by scanning an image source (such as a fiber optic scanner) can be imaged on a plane to achieve clear imaging.

[0122] Embodiment 4

[0123] Fig.15 A schematic diagram of the structure of an optical imaging lens assembly provided in Example 4. The optical imaging lens assembly includes six lenses arranged in sequence along the optical axis, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the second side to the first side on the same optical axis. It should be noted that the focal lengths corresponding to the first lens to the sixth lens in the optical imaging lens assembly of this embodiment are negative, positive, positive, positive, negative, and negative, respectively.

[0124] Furthermore, the second side of the optical imaging lens group of this embodiment corresponds to the curved surface image 01 at the light source end. The lens numerical aperture (NA) of the optical imaging lens group is 0.27 mm, the total focal length is 1.65 mm, the exit pupil diameter is 0.92 mm, the working distance is 0.4 mm, and the full field of view angle is 36 degrees.

[0125] In the embodiment of the present disclosure, the optical imaging lens assembly further includes an aperture, which may be located at a first side of the optical imaging lens assembly, wherein the side surface of the optical imaging lens assembly close to the aperture is a concave surface, that is, the side surface of a sub-lens corresponding to the sixth lens (i.e., the negative lens L6_2 in this embodiment) close to the aperture is a concave surface. Further, the distance d between the side surface of the negative lens L6_2 corresponding to the sixth lens close to the aperture and the aperture on the optical axis is 1.67 mm.

[0126] In this embodiment, the smallest negative lens in the optical imaging lens assembly and the total focal length of the optical imaging lens assembly have the following ratio relationship: 最小负 / f 总=-0.54.

[0127] In this embodiment, the relationship between the focal length of each lens and the total focal length of the lens is shown in Table 7:

[0128] Table 7 Parameter table of the relationship between the focal length of each lens and the total focal length of the lens in this embodiment

[0129]

[0130] Further, in the embodiment of the present application, the preferred parameters of the curvature radius, thickness parameter, refractive index and Abbe number of each lens of the optical imaging lens assembly for imaging the curved image 01 are shown in Table 8:

[0131] Table 8 Structural parameters of the optical imaging lens assembly in Example 4

[0132] surface Lens number Face shape Radius of curvature thickness Material refractive index Abbe number Surface Image 01 - 0.40 1 L1 Spherical -1.20 1.00 1.95 17.90 2 -2.36 0.21 3 L2 Spherical -2.24 2.20 2.00 25.40 4 -2.58 0.10 5 L3_1 Spherical 26.78 0.40 1.95 17.90 6 L3_2 Spherical 3.60 1.53 1.58 65.30 7 -8.49 0.10 8 L4 Spherical 4.89 1.24 1.77 49.60 9 -45.42 0.62 10 L5_2 Spherical -4.03 0.50 1.89 21.50 11 L5_1 Spherical 5.32 1.94 1.68 55.30 12 -3.80 0.10 13 L6_1 Spherical 2.75 1.80 1.95 18.00 14 L6_2 Spherical -6.81 1.04 1.92 23.40 15 1.03 1.67 Aperture unlimited - Flat image unlimited

[0133] It should be noted that Table 8 is the detailed structural data of the optical imaging lens assembly of Example 4, wherein the units of the radius of curvature, thickness and focal length are all in millimeters, and surfaces 1-15 represent the surfaces from the second side to the first side in sequence; the optical surface with an infinite radius of curvature in the imaging plane is a flat surface. According to the contents of Table 8, in the cemented lens of this example, the refractive index difference between the negative lens L3_1 and the positive lens L3_2 of the third lens L3 is 0.37, the refractive index difference between the negative lens L5_2 and the positive lens L5_1 of the fifth lens L5 is 0.21, and the difference between the positive lens L6_1 and the negative lens L6_2 of the sixth lens L6 is 0.03.

[0134] Further, according to the contents of Table 7 and Table 8, the achromatic power Z3 of the third lens L3 is -0.0496, the achromatic power Z5 of the fifth lens is -0.113, and the achromatic power Z6 of the sixth lens is -0.4958.

[0135] Furthermore, after testing, when the above optical imaging lens assembly is used to project the image light corresponding to the scanning surface, the optical transfer function curve is as follows: Fig.16 As shown, the field curvature distortion curve is as follows Fig.17 As shown, the vertical axis chromatic aberration curve is as follows Fig.18 As shown; among them, the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, the field curvature distortion curve represents the F-Tan (theta) distortion value (percentage) under different field angles, and the vertical axis chromatic aberration curve represents the chromatic aberration size perpendicular to the axial direction.

[0136] Depend on Figure 16-Figure 18It can be observed that the optical imaging lens assembly of Example 4 has good imaging resolution in the full field of view, and small optical system distortion and chromatic aberration. Therefore, the optical imaging lens assembly can clearly image the scanned curved surface image of the optical fiber scanner and has good imaging effect.

[0137] Of course, in practical applications, the optical imaging lens group may also include a display element, a shell, etc. The display element may be disposed on a first side of the optical imaging lens group, and the optical imaging lens group may be installed in the shell, so that a curved surface image formed by scanning an image source (such as a fiber optic scanner) can be imaged on a plane to achieve clear imaging.

[0138] Embodiment 5

[0139] Fig.19 A schematic diagram of the structure of an optical imaging lens assembly provided in Example 5. The optical imaging lens assembly includes six lenses arranged in sequence along the optical axis, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the second side to the first side on the same optical axis. It should be noted that the focal lengths corresponding to the first lens to the sixth lens in the optical imaging lens assembly of this embodiment are negative, positive, positive, negative, positive, and negative, respectively.

[0140] Furthermore, the second side of the optical imaging lens group of this embodiment corresponds to the curved surface image 01 at the light source end. The lens numerical aperture (NA) of the optical imaging lens group is 0.27 mm, the total focal length is 1.98 mm, the exit pupil diameter is 0.896 mm, the working distance is 0.64 mm, and the full field of view angle is 28 degrees.

[0141] In the embodiment of the present disclosure, the optical imaging lens assembly further includes an aperture, which may be located at a first side of the optical imaging lens assembly, wherein the side surface of the optical imaging lens assembly close to the aperture is a concave surface, that is, the side surface of a sub-lens corresponding to the sixth lens (i.e., the negative lens L6_2 in this embodiment) close to the aperture is a concave surface. Further, the distance d between the side surface of the negative lens L6_2 corresponding to the sixth lens close to the aperture and the aperture on the optical axis is 2.64 mm.

[0142] In this embodiment, the smallest negative lens in the optical imaging lens assembly and the total focal length of the optical imaging lens assembly have the following ratio relationship: 最小负 / f 总 =-0.54.

[0143] In this embodiment, the relationship between the focal length of each lens and the total focal length of the lens is shown in Table 9:

[0144] Table 9 Parameter table of the relationship between the focal length of each lens and the total focal length of the lens in this embodiment

[0145]

[0146]

[0147] Further, in the embodiment of the present application, the preferred parameters of the curvature radius, thickness parameter, refractive index and Abbe number of each lens of the optical imaging lens assembly for imaging the curved image 01 are shown in Table 10:

[0148] Table 10 Structural parameters of the optical imaging lens assembly in Example 5

[0149] surface Lens number Face shape Radius of curvature thickness Material refractive index Abbe number Surface Image 01 - 0.49 1 L1 Spherical -0.88 1.87 2.00 25.40 2 -2.40 0.10 3 L2 Spherical 17.33 1.59 1.77 49.60 4 -5.17 0.10 5 L3_1 Spherical 40.02 1.37 1.97 20.10 6 L3_2 Spherical 3.40 1.93 1.63 58.90 7 -7.54 0.58 8 L4 Spherical -3.77 0.50 1.51 77.00 9 -5.94 0.10 10 L5_1 Spherical 4.57 2.23 1.77 49.60 11 L5_2 Spherical -5.00 2.30 1.96 24.70 12 85.51 0.10 13 L6_1 Spherical 2.55 1.25 1.95 18.00 14 L6_2 Spherical 4.66 0.50 1.66 27.50 15 1.14 2.64 Aperture unlimited - Flat image unlimited

[0150] It should be noted that Table 10 is the detailed structural data of the optical imaging lens assembly in Example 5, wherein the units of the radius of curvature, thickness and focal length are all in millimeters, and surfaces 1-15 represent the surfaces from the second side to the first side in sequence; the optical surface with an infinite radius of curvature in the imaging plane is a flat surface. According to the content of Table 10, in the cemented lens in this example, the refractive index difference between the negative lens L3_1 and the positive lens L3_2 of the third lens L3 is 0.34, the refractive index difference between the negative lens L5_2 and the positive lens L5_1 of the fifth lens L5 is 0.19, and the difference between the positive lens L6_1 and the negative lens L6_2 of the sixth lens L6 is 0.29.

[0151] Further, according to the contents of Table 9 and Table 10, the achromatic power Z3 of the third lens L3 is -0.065, the achromatic power Z5 of the fifth lens L5 is -0.0605, and the achromatic power Z6 of the sixth lens L6 is -0.09.

[0152] Furthermore, after testing, when the above optical imaging lens assembly is used to project the image light corresponding to the scanning surface, the optical transfer function curve is as follows: Fig. 20 As shown, the field curvature distortion curve is as follows Fig.21 As shown, the vertical axis chromatic aberration curve is as follows Fig. 22 As shown; among them, the optical transfer function curve (Modulation Transfer Function, MTF) represents the comprehensive resolution level of an optical system, the field curvature distortion curve represents the F-Tan (theta) distortion value (percentage) under different field angles, and the vertical axis chromatic aberration curve represents the chromatic aberration size perpendicular to the axial direction.

[0153] Depend on Figure 20-Figure 22 It can be observed that the optical imaging lens assembly of Example 5 has good imaging resolution in the full field of view, and small optical system distortion and chromatic aberration. Therefore, the optical imaging lens assembly can clearly image the scanned curved surface image of the optical fiber scanner and has good imaging effect.

[0154] Of course, in practical applications, the optical imaging lens group may also include a display element, a shell, etc. The display element may be disposed on a first side of the optical imaging lens group, and the optical imaging lens group may be installed in the shell, so that a curved surface image formed by scanning an image source (such as a fiber optic scanner) can be imaged on a plane to achieve clear imaging.

[0155] Scanning display device

[0156] The aforementioned optical imaging lens assembly can be used in conjunction with a fiber scanner (or a corresponding fiber scanning module) to form a scanning display device (such as Figure 1a , 1b As shown, the optical imaging lens group is arranged on the light output path of the optical fiber scanner), wherein the second side of the optical imaging lens group faces the light output direction of the optical fiber scanner. The preferred method is that the optical imaging lens group is coaxial with the central optical axis of the optical fiber scanner. Of course, the structure and general principle of the optical fiber scanner can be referred to the aforementioned Figure 1a , 1b The corresponding content will not be elaborated here.

[0157] In addition, in a possible implementation, the present application also provides an application of the above-mentioned scanning display device, that is, the above-mentioned scanning display device is configured in the projection field, specifically configured and applied in vehicle-mounted projection. It can not only be configured in relevant positions in the vehicle such as on the external body or head-up display, but it can also be configured in the vehicle for projection display, and it can be flexibly set according to the display requirements of the vehicle-mounted projection.

[0158] In some embodiments, the scanning display device can be applied to vehicles, including but not limited to automobiles, motorcycles, electric bicycles, balance vehicles, scooters, etc. In some embodiments, the vehicle-mounted projection system can also be used in other tools with transportation capabilities, such as aircraft, ships, wheelchairs, etc. Taking a car as a specific example, the optical imaging module of the scanning display device can be set at the door, front or rear of the car to project the image onto the ground around the car body. It should be noted that the image corresponding to the imaging end is a plane image, and the corresponding plane image carrier can be, for example, a projection screen, a curtain, the ground or a glass surface. It should be noted that in the specific application of the scanning display device, the number of scanning display devices can be one or more groups. When the scanning display device is located at different positions of the carrier (for example, a vehicle), the specifications of the fiber optic scanner, the distribution of each lens in the optical imaging lens group, the parameters, etc. can be adaptively adjusted according to the specific scene.

[0159] In summary, in the embodiment of the present application, by reasonably optimizing the focal lengths of the six coaxial lenses of the optical imaging lens group, the optical power of the system can be reasonably dispersed, the aberrations generated by the lenses can be mitigated, the purpose of correcting multiple aberrations can be achieved, and clear imaging of the image side curved surface can be achieved; by limiting the ratio of the focal length of the smallest negative lens among the multiple lenses to the total focal length of the optical imaging lens group, the imaging quality of the optical imaging lens group is further guaranteed; by configuring the above-mentioned optical imaging lens group in a fiber scanner, a miniaturized and lightweight scanning display device is formed, and the scanning display device is configured and applied in the field of vehicle-mounted projection, which can meet the requirements of large viewing angle, high resolution and low distortion of vehicle-mounted projection.

[0160] The above are only preferred specific embodiments of the present application. Each embodiment is only used to illustrate the technical solution of the present application but not to limit the present application. Any technical solution that can be obtained by technical personnel in this field through logical analysis, reasoning or effective experiments based on the concept of the present application should be within the scope of the present application.

[0161] The various embodiments in the present application are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0162] The expressions "first", "second", "the first" or "the second" used in various embodiments of the present disclosure may modify various components regardless of order and / or importance, but these expressions do not limit the corresponding components. The above expressions are only configured for the purpose of distinguishing an element from other elements.

Claims

1. An optical imaging lens assembly, characterized in that: The optical imaging lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens which are arranged on a common optical axis in sequence from the second side to the first side, the focal lengths corresponding to the first lens to the third lens are negative, positive, and positive, respectively, and the focal lengths corresponding to the fourth lens to the sixth lens are negative, positive, negative or positive, negative, and negative, respectively; the third lens, the fifth lens, and the sixth lens are all cemented lenses combining a positive lens and a negative lens, the refractive index of the positive lens in the third lens and the fifth lens is smaller than the refractive index of the negative lens, and the refractive index of the positive lens in the sixth lens is larger than the refractive index of the negative lens.

2. The optical imaging lens assembly according to claim 1, characterized in that: The minimum negative lens in the optical imaging lens group and the total focal length of the optical imaging lens group have the following ratio relationship: 0.54≤|f 最小负 / f 总 |≤1.21, where f 最小负 is the focal length of the smallest negative lens, f 总 is the total focal length of the optical imaging lens assembly.

3. The optical imaging lens assembly according to claim 1, characterized in that: The third lens, the fifth lens and the sixth lens satisfy at least one of the following conditions: The difference in refractive index between the negative lens and the positive lens in the third lens is 0.19 to 0.37; The refractive index difference between the negative lens and the positive lens in the fifth lens is 0.04-0.24; The difference in refractive index between the positive lens and the negative lens in the sixth lens is 0.03-0.

29.

4. The optical imaging lens assembly according to claim 1, characterized in that: The negative lens in the sixth lens is closer to the first side than the positive lens.

5. The optical imaging lens assembly according to any one of claims 1 to 4, characterized in that: The surface of the first side of the optical imaging lens assembly is a concave surface.

6. The optical imaging lens assembly according to any one of claims 1 to 4, characterized in that: The second side corresponds to a curved surface image at the light source end, the curved surface image is formed by the configuration of the optical fiber scanner, and the surface of the second side of the optical imaging lens assembly is a concave surface.

7. The optical imaging lens assembly according to any one of claims 1 to 4, characterized in that: The achromatic power Z3 of the third lens is -0.065 to -0.029, the achromatic power Z5 of the fifth lens is -0.1343 to -0.0605, and the achromatic power Z6 of the sixth lens is -0.4958 to -0.

09.

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

Images