Optical imaging lens group, scanning display device and application

Abstract

The invention discloses an optical imaging lens group, a scanning display device and application, and relates to the technical field of scanning display. The optical imaging lens group provided by the invention comprises seven lenses which are sequentially arranged along a common optical axis from a first side to a second side, the object side surfaces of the first lens and the second lens are convex surfaces, the image side surfaces of the first lens and the second lens are concave surfaces, a fourth lens is combined with one lens adjacent to the fourth lens to form a glued lens, and the other lens is a positive lens; the image side surfaces of the sixth lens and the seventh lens are convex surfaces, and the object side surfaces of the sixth lens and the seventh lens are concave surfaces; the focal length value of the image side face of the second lens ranges from-1.6 to-1.366. The ratio of the curvature radius of the object side face of the seventh lens to the working distance of the seventh lens ranges from 3.49 to 4.93. According to the optical imaging lens group provided by the embodiment of the invention, the spherical lens and the aspherical lens are adopted, so that the imaging quality is improved while the number of the lenses is reduced.

Description

Technical Field

[0001] This application relates to the field of scanning display technology, specifically to an optical imaging lens assembly, a scanning display device, and its application. Background Technology

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

[0003] However, existing scanning display imaging systems typically use eyepiece-type vehicle projection lenses for imaging. Due to the structural characteristics of global surface eyepiece-type vehicle projection lenses, global surface lenses have a weaker ability to correct spherical aberration and require a large number of lenses. In addition, it is difficult to balance aberrations such as coma and astigmatism in the imaging process under a large field of view, making it difficult for eyepiece-type vehicle projection lenses to achieve both a large field of view and high-quality imaging characteristics. Summary of the Invention

[0004] The purpose of this application is to provide an optical imaging lens assembly that combines spherical and aspherical lenses to meet the requirements of large field of view, small distortion, and high resolution in vehicle projection scenarios while reducing the number of lenses.

[0005] Another objective of this application is to provide an application of a scanning display device configured for use in the field of vehicle projection, which features high imaging quality, miniaturization, and lightweight design.

[0006] This application provides an optical imaging lens assembly, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged coaxially along a first side to a second side. The first side corresponds to the imaging side, and the second side corresponds to a curved image at the light source end. The curved image is formed by a fiber optic scanner. The second lens is a meniscus aspherical lens bent towards the aperture stop. The object-side surfaces of both the first and second lenses are convex, and the image-side surfaces of both the first and second lenses are concave. The fourth lens and one of its adjacent lenses are a cemented lens, and the other is a positive lens. The image-side surfaces of both the sixth and seventh lenses are convex, and the object-side surfaces of both are concave. The focal length of the image-side surface of the second lens ranges from -1.6 to -1.366, and the ratio of the radius of curvature of the object-side surface of the seventh lens to the working distance from the seventh lens to the curved image is 3.49 to 4.93.

[0007] Furthermore, in a preferred embodiment of this application, the optical powers of the first lens, the second lens, the sixth lens, and the seventh lens are positive, negative, positive, positive, and negative, respectively, and one of the cemented lenses has a positive optical power and the other has a negative optical power.

[0008] Furthermore, in a preferred embodiment of this application, the Abbe number of the positive lens in the cemented lens is greater than the Abbe number of the negative lens in the cemented lens.

[0009] Furthermore, in a preferred embodiment of this application, the sum of the ratio of the optical power to Abbe number of one of the cemented lenses and the ratio of the optical power to Abbe number of the other cemented lens is in the range of -0.023 to -0.0088.

[0010] Furthermore, in a preferred embodiment of this application, the focal length of the object-side surface of the seventh lens is in the range of -3.11 to -2.5.

[0011] Furthermore, in a preferred embodiment of this application, the combined focal length of the sixth lens and the seventh lens is in the range of 4.75 to 14.78.

[0012] Furthermore, in a preferred embodiment of this application, an aperture stop is provided on the first side of the optical imaging lens group.

[0013] This application also provides a scanning display device, which includes a fiber optic scanner and the aforementioned optical imaging lens group. The fiber optic scanner is used to scan and emit light of an image to be displayed, 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 on the actuator. The portion of the optical fiber extending beyond the actuator forms an optical fiber cantilever, and the optical fiber cantilever performs two-dimensional scanning under the drive of the actuator.

[0014] This application also provides an application of the scanning display device as described above, comprising: configuring the scanning display device in the field of vehicle display.

[0015] The technical solution in this application embodiment can achieve the following technical effects: by using an optical imaging lens group that combines spherical and aspherical lenses, the requirements of large field of view, small distortion, and high resolution are met while reducing the number of lenses; the concave surface of the seventh lens and the curved surface image are oriented in the same direction, and by limiting the ratio of the radius of curvature of the object side surface of the seventh lens to the working distance from the seventh lens to the curved surface image, the lens closest to the curved surface image can be well adapted to the curved surface image, which is beneficial for receiving light from a large angle of view, thereby enabling more comprehensive and sufficient acquisition of information from the curved surface image. Furthermore, when light passes through the seventh lens to the second lens, the second lens is a meniscus aspherical surface with its concave surface (image side) facing the imaging side. This allows the second lens to utilize the principle of the Qiming lens to generate a larger positive field curvature while minimizing the production of additional spherical aberration / coma / astigmatism. Since the focal length of the entire lens is positive, the optical power contribution of the positive lens must be greater than that of the negative lens. The second lens uses a meniscus aspherical surface with a smaller concave focal length and a larger optical power, which can provide a larger positive field curvature to deflect the light path upwards. This can counteract the negative field curvature produced by the positive optical power lens, thereby improving the imaging quality of the optical imaging lens group.

[0016] Other features and advantages of this application will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the technical solutions of this application. The objectives and other advantages of this application may be realized and obtained by means of the structures and / or processes particularly pointed out in the description, claims and drawings. Attached Figure Description

[0017] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0018] Figure 1a , 1b This is an illustrative structural diagram of a scanning display system;

[0019] Figure 2 This is a schematic diagram of the scanning output of the fiber optic scanner provided in an embodiment of this application;

[0020] Figure 3 This is a schematic diagram of the structure of an optical imaging lens assembly provided in Embodiment 1 of this application;

[0021] Figure 4 This is the MTF curve of the optical imaging lens group in Embodiment 1 of this application;

[0022] Figure 5 This is a field curvature distortion curve of the optical imaging lens group in Embodiment 1 of this application;

[0023] Figure 6This is the transverse chromatic aberration diagram of the optical imaging lens group in Embodiment 1 of this application;

[0024] Figure 7 This is a schematic diagram of the structure of an optical imaging lens assembly provided in Embodiment 2 of this application;

[0025] Figure 8 This is the MTF curve of the optical imaging lens group in Embodiment 2 of this application;

[0026] Figure 9 This is a field curvature distortion curve of the optical imaging lens group in Embodiment 2 of this application;

[0027] Figure 10 This is the transverse chromatic aberration diagram of the optical imaging lens group in Embodiment 2 of this application;

[0028] Figure 11 This is a schematic diagram of the structure of an optical imaging lens assembly provided in Embodiment 3 of this application;

[0029] Figure 12 This is the MTF curve of the optical imaging lens group in Embodiment 3 of this application;

[0030] Figure 13 This is a field curvature distortion curve of the optical imaging lens group in Embodiment 3 of this application;

[0031] Figure 14 This is the transverse chromatic aberration diagram of the optical imaging lens group in Embodiment 3 of this application;

[0032] Figure 15 This is a schematic diagram of the structure of an optical imaging lens assembly provided in Embodiment 4 of this application;

[0033] Figure 16 This is the MTF curve of the optical imaging lens group in Embodiment 4 of this application;

[0034] Figure 17 This is a field curvature distortion curve of the optical imaging lens group in Embodiment 4 of this application;

[0035] Figure 18 This is the transverse chromatic aberration diagram of the optical imaging lens group in Embodiment 4 of this application;

[0036] Figure 19 This is a schematic diagram of the structure of an optical imaging lens assembly provided in Embodiment 5 of this application;

[0037] Figure 20 This is the MTF curve of the optical imaging lens group in Embodiment 5 of this application;

[0038] Figure 21 This is a field curvature distortion curve of the optical imaging lens group in Embodiment 5 of this application;

[0039] Figure 22 This is the transverse chromatic aberration diagram of the optical imaging lens group in Embodiment 5 of this application;

[0040] Figure 23 This is a schematic diagram of the structure of an optical imaging lens assembly provided in Embodiment Six of this application;

[0041] Figure 24 This is the MTF curve of the optical imaging lens group in Embodiment Six of this application;

[0042] Figure 25 This is a field curvature distortion curve of the optical imaging lens group in Embodiment Six of this application;

[0043] Figure 26 This is the chromatic aberration diagram of the optical imaging lens group in Embodiment Six of this application.

[0044] Icons: 100-Processor; 110-Laser group; 120-Fiber optic scanning module; 130-Transmission fiber; 140-Light source modulation circuit; 150-Scanning drive circuit; 160-Band combining unit; 121-Scanning actuator; 121a-Slow axis; 121b-Fast axis; 122-Fiber optic cantilever; 123-Mirror group; 124-Scanner package; 125-Fixture; 230-Scanning surface; 240-Imaging plane. Detailed Implementation

[0045] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0046] Explanatory Scanning Display System

[0047] Current scanning display imaging can be achieved using either a Digital Micromirror Device (DMD) or a Fiber Scanning Display (FSD) device. The FSD approach, as a novel scanning display imaging method, uses a fiber optic scanner to achieve image scanning output. To enable those skilled in the art to clearly understand the present application, a brief explanation of the principles and corresponding system of fiber optic scanning imaging is provided below.

[0048] like Figure 1a The image shown is an illustrative scanning display system according to this application, which mainly includes:

[0049] The system includes a processor 100, a laser assembly 110, an optical fiber scanning module 120, a transmission optical fiber 130, a light source modulation circuit 140, a scanning drive circuit 150, and a beam combining unit 160.

[0050] The processor 100 can be a graphics processing unit (GPU), a central processing unit (CPU), or other chips or circuits with control and image processing functions, without being specifically limited here.

[0051] When the system is in operation, the processor 100 controls the light source modulation circuit 140 to modulate the laser group 110 according to the image data to be displayed. The laser group 110 contains multiple monochromatic lasers, each emitting a beam of a different color. As shown in Figure 1, the laser group can specifically use red (R), green (G), and blue (B) lasers. The beams emitted by each laser in the laser group 110 are combined into a single laser beam by the beam combining unit 160 and coupled into the transmission optical fiber 130.

[0052] The processor 100 can also control the scanning drive circuit 150 to drive the fiber scanner in the fiber scanning module 120 to perform scanning, thereby scanning and outputting the beam transmitted in the transmission fiber 130.

[0053] 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.

[0054] Continue to refer to Figure 1bThe 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.

[0055] like Figure 2 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 imaging is on a planar carrier, the image is a plane. It should be noted that in other embodiments of the present invention, 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).

[0056] 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 2 The lens group 123 shown serves as an eyepiece. Through the action of this optical imaging lens group, the scanning surface 230 can be converted into an imaging plane 240 (in actual applications, the direction of light transmission is from the scanning surface 230 to the imaging plane 240).

[0057] It should be further noted that in the field of projection, the image corresponding to the imaging end is a planar image, and the corresponding planar image carrier can be such as a projection screen, screen, ground, glass surface or wall, etc. The image corresponding to the light source end is a curved image, that is, the arc-shaped scanning surface scanned by the fiber optic scanner or emitted by other image sources. In the application scenario of the camera field, the optical path is reversed in the field of projection. The light source end generally corresponds to the object side that collects image information, and the imaging end generally corresponds to the image side that is collected and imaged.

[0058] Optical imaging lens group

[0059] Please refer to Figure 3 , Figure 7 , Figure 11 , Figure 15 , Figure 19 and Figure 23 The optical imaging lens assembly in this embodiment includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged coaxially from a first side to a second side. The first side corresponds to the imaging side, and the second side corresponds to the curved image at the light source end. The curved image is formed by a fiber optic scanner. The second lens is a meniscus aspherical lens bent towards the imaging side. The object-side surfaces of the first, second, and third lenses are convex, while the image-side surface of the first and second lenses is concave. The fourth lens and one of its adjacent lenses form a cemented lens, and the other is a positive lens. The image-side surfaces of the sixth and seventh lenses are convex, and the object-side surfaces of the sixth and seventh lenses are concave. The focal length of the image-side surface of the second lens ranges from -1.6 to -1.366. The ratio of the radius of curvature of the object-side surface of the seventh lens to the working distance from the seventh lens to the curved image is 3.49 to 4.93. This embodiment of the application employs an optical imaging lens group that combines spherical and aspherical lenses, reducing the number of lenses while meeting the requirements of a large field of view, low distortion, and high resolution. Specifically, the concave surface of the seventh lens and the curved surface image are oriented in the same direction. By limiting the ratio of the radius of curvature of the object side surface of the seventh lens to the working distance from the seventh lens to the curved surface image, the lens closest to the curved surface image can be well adapted to the curved surface image, which is beneficial for receiving light from a large angle of view, thereby enabling more comprehensive and sufficient acquisition of information from the curved surface image. Furthermore, when light passes through the seventh lens to the second lens, the second lens is a meniscus aspherical surface with its concave surface (image side) facing the imaging side. This allows the second lens to utilize the principle of the Qiming lens to generate a larger positive field curvature while minimizing the production of additional spherical aberration / coma / astigmatism. Since the focal length of the entire lens is positive, the optical power contribution of the positive lens must be greater than that of the negative lens. The second lens uses a meniscus aspherical surface with a smaller concave focal length and a larger optical power, which can provide a larger positive field curvature to deflect the light path upwards. This can counteract the negative field curvature produced by the positive optical power lens, thereby improving the imaging quality of the optical imaging lens group.

[0060] The negative focal length of the second lens can produce a large positive field curvature. Since the focal length of the entire lens is positive, the optical power contribution of the positive lens is necessarily greater than that of the negative lens. By limiting the ratio of the focal length of the second lens to the total focal length of the optical imaging lens group, the negative field curvature produced by these positive optical power lenses can be counteracted, thereby improving the image quality.

[0061] Furthermore, the optical powers of the first, second, sixth, and seventh lenses are positive, negative, positive, and negative, respectively; the optical powers of the fourth and fifth lenses are positive and negative or negative and positive, respectively; and one of the cemented lenses has a positive optical power, while the other has a negative optical power. In this embodiment of the invention, by rationally optimizing the positive and negative focal lengths of the seven coaxial lenses in the optical imaging lens group, the optical power of the system can be reasonably dispersed, aberrations generated by the lenses can be reduced, and the purpose of correcting various aberrations can be achieved, thus realizing clear imaging of the image plane. It should be noted that, in this application, the optical axis direction extending from the second side to the first side is considered the positive direction, and the optical axis direction extending from the first side to the second side is considered the negative direction.

[0062] Furthermore, the Abbe number of the positive lens in a cemented lens is greater than that of the negative lens. The primary purpose of using cemented lenses here is to balance the systemic coma and astigmatism of the optical imaging lens group. In addition, after the light rays emitted from the curved image diverge and converge through multiple lenses, the cemented lenses diverge the converged light rays, ensuring that the light converges within the same plane. This also eliminates spherical aberration and chromatic aberration during the imaging process, guaranteeing image quality.

[0063] Furthermore, the sum of the ratio of the optical power to Abbe number of one of the cemented lenses and the ratio of the optical power to Abbe number of the other cemented lens is in the range of -0.023 to -0.0088. The sum of the ratios of the optical power to Abbe number of the two lenses in a cemented lens is close to 0, indicating good achromatic aberration capability.

[0064] Furthermore, the focal length of the object side of the seventh lens is in the range of -3.11 to -2.58.

[0065] Furthermore, the combined focal length of the sixth and seventh lenses is in the range of 4.75 to 14.78. The first to fifth lenses can achieve a large positive field curvature, but this positive field curvature cannot match the curved image. Here, the sixth and seventh lenses can better match the curved image, which is beneficial for receiving light from a large angle of view, thereby allowing for a more comprehensive and sufficient capture of information from the curved image.

[0066] Furthermore, in a preferred embodiment of this application, an aperture stop is provided on the first side of the optical imaging lens group. It should be noted that the aperture stop is used to match the light emission angle of the image source. If the angle of the principal rays of the image source is determined and they converge in opposite directions near a point, the aperture stop can also be a virtual aperture stop.

[0067] Furthermore, in one possible implementation, the connection between multiple lenses can be achieved by spacing or by adhesive bonding, depending on the specific application requirements, and no limitation is imposed here.

[0068] Alternatively, in one possible implementation, multiple lenses are made of either plastic or glass. It should be noted that lenses made of plastic can effectively reduce production costs. Compared to glass, the cost of plastic lenses is one-twentieth to one-tenth of that of glass lenses, making them highly advantageous for low-cost mass production. Furthermore, plastic lenses are typically injection molded, which is easy to process and can be readily fabricated into various aspherical shapes. Plastic also reduces the overall weight of the lens, facilitating lightweight product design. When using glass, its higher and wider refractive index offers advantages in correcting lens aberrations. Glass also has a much lower coefficient of thermal expansion, which is beneficial for precision assembly. Additionally, glass's inherent resistance to high temperatures, ultraviolet radiation, and acids and alkalis provides significant advantages in terms of lens lifespan and performance stability. It should be emphasized that other embodiments of the present invention are not limited to the plastic and glass materials provided in the embodiments of the present invention; other materials suitable for making lenses can also be used.

[0069] Example 1

[0070] Figure 3This is a schematic diagram of an optical imaging lens assembly provided in Embodiment 1. The optical imaging lens assembly includes seven lenses arranged sequentially along the optical axis, namely, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 arranged coaxially from the first side to the second side. The focal lengths of the first lens L1 to the seventh lens L7 are positive, negative, positive, positive, negative, positive, and negative, respectively. Further, an aperture stop is located on the first side of the optical imaging lens assembly. The object-side surface S2 of the first lens L1, the object-side surface S4 of the second lens L2, and the object-side surface S6 of the third lens L3 are all convex surfaces. The image-side surface S1 of the first lens L1 is concave, the image-side surface S3 of the second lens L2 is concave, and the image-side surface S5 of the third lens L3 is convex. The second lens L2 is a meniscus aspherical lens that curves towards the aperture stop. The fourth lens L4 and the fifth lens L5 are cemented lenses. The fourth lens L4 is a biconvex lens, and the object-side surface S9 of the fifth lens L5 is convex. The object-side surface of the fourth lens L4 and the image-side surface of the fifth lens L5 share a common surface S8. The image-side surface S10 of the sixth lens L6 and the image-side surface S12 of the seventh lens L7 are both convex. The object-side surface S11 of the sixth lens L6 is concave, and the object-side surface S13 of the seventh lens L7 is concave. The seventh lens is meniscus and curves towards the curved image surface. It should be noted that the surface shape of the lenses in the optical imaging lens group is not limited to the above description and can be adjusted appropriately. For example, the image-side surface of the first lens L1 can also be flat, and the image-side surface of the third lens L3 can also be concave or flat.

[0071] Furthermore, in this embodiment, the second side of the optical imaging lens group corresponds to the curved image at the light source end. The lens of the optical imaging lens group has an F / # of 1.75mm, a total focal length of 1.59mm, a working distance of 0.34mm, and a full field of view of 36 degrees. It should be noted that, in this embodiment, the working distance refers to the distance on the optical axis between the concave surface of the second side of the optical image group (i.e., the object side surface of the seventh lens) and the curved image.

[0072] The relationship between the focal length of each lens and the total focal length of the lens in this embodiment is shown in Table 1:

[0073] Table 1 shows the relationship between the focal length of each lens element and the total focal length of the lens in this embodiment.

[0074]

[0075] Furthermore, in the embodiments of this specification, the preferred parameters for the radius of curvature, thickness, refractive index, and Abbe number of each lens in the optical imaging lens group for imaging curved surface images are shown in Table 2:

[0076] Table 2 Structural parameters of the optical imaging lens assembly in Example 1

[0077]

[0078]

[0079] It should be noted that Table 2 contains detailed structural data of the optical imaging lens assembly in Embodiment 1. The units for radius of curvature, thickness, and focal length are all millimeters, and the order of surfaces S1-13 indicates the surfaces from the first side to the second side; an optical surface with a radius of curvature of "Infinity" refers to a planar surface. Furthermore, the single-sided focal length of the image-side surface S3 of the second lens L2 is -1.41 mm, and the single-sided focal length of the object-side surface S13 of the seventh lens L7 is -2.58 mm. Further, the sum of the ratio of the optical power to Abbe number of the fourth lens and the ratio of the optical power to Abbe number of the fifth lens is -0.0088.

[0080] In the embodiments described in this specification, the second lens L2 is an aspherical lens. Specific parameters for the aspherical lens are shown in Table 3.

[0081] Table 3 Aspheric coefficients of the optical imaging lens group in Example 1

[0082] Surface serial number K A4 A6 A8 A10 S3 -0.77 0.051 0.0454 0.14 -0.24 S4 -0.69 0.002 -0.0013 0.001 -0.0002

[0083] It should be noted that Table 3 contains detailed data on the image side S3 and object side S4 of the second lens L2 in the optical imaging lens group of Embodiment 1.

[0084] 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 4 As shown, the field distortion curve is as follows: Figure 5 As shown, the vertical axis color difference curve is as follows: Figure 6 As shown; among them, the Modulation Transfer Function (MTF) curve represents the overall resolution level of an optical system, the Field Curve Distortion curve represents the F-Tan (theta) distortion magnitude (percentage) under different field angles, and the Vertical Chromatic Aberration curve represents the magnitude of chromatic aberration in the direction perpendicular to the axial direction.

[0085] Depend on Figures 4-6 Observations show that the optical imaging lens group in Example 1 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.

[0086] 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 first 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.

[0087] Example 2

[0088] Figure 7 This is a schematic diagram of an optical imaging lens assembly provided in Embodiment 2. The optical imaging lens assembly includes seven lenses arranged sequentially along the optical axis, namely, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 arranged coaxially from the first side to the second side. The focal lengths of the first lens L1 to the seventh lens L7 are positive, negative, positive, positive, negative, positive, and negative, respectively. Further, an aperture stop is located on the first side of the optical imaging lens assembly. The object-side surface S2 of the first lens L1, the object-side surface S4 of the second lens L2, and the object-side surface S6 of the third lens L3 are all convex surfaces. The image-side surface S1 of the first lens L1 is concave, the image-side surface S3 of the second lens L2 is concave, and the image-side surface S5 of the third lens L3 is planar. The second lens L2 is a meniscus aspherical lens that curves towards the aperture stop. The fourth lens L4 and the fifth lens L5 are cemented lenses. The fourth lens L4 is a biconvex lens, and the fifth lens L5 is a plano-concave lens. The object-side surface of the fourth lens L4 and the image-side surface of the fifth lens L5 are shared surfaces. The image-side surface S10 of the sixth lens L6 and the image-side surface S12 of the seventh lens L7 are both convex surfaces. The object-side surface S11 of the sixth lens L6 is concave, and the object-side surface S13 of the seventh lens L7 is concave. The seventh lens L7 is meniscus and curves towards the curved image surface. It should be noted that the surface shape of the lenses in the optical imaging lens group is not limited to the above description and can be adjusted appropriately. For example, the image-side surface of the first lens L1 can also be flat, and the image-side surface of the third lens L3 can also be concave or convex.

[0089] Furthermore, in this embodiment, the second side of the optical imaging lens group corresponds to the curved image at the light source end. The lens of the optical imaging lens group has an F / # of 1.75mm, a total focal length of 1.59mm, a working distance of 0.325mm, and a full field of view of 36 degrees.

[0090] The relationship between the focal length of each lens and the total focal length of the lens in this embodiment is shown in Table 4:

[0091] Table 4 shows the relationship between the focal length of each lens element and the total focal length of the lens in this embodiment.

[0092]

[0093] Furthermore, in this embodiment of the invention, the preferred parameters for the radius of curvature, thickness, refractive index, and Abbe number of each lens in the optical imaging lens group for imaging curved surface images are shown in Table 5:

[0094] Table 5 Structural parameters of the optical imaging lens assembly in Example 2

[0095]

[0096] It should be noted that Table 5 contains detailed structural data of the optical imaging lens assembly in Embodiment 2. The units for radius of curvature, thickness, and focal length are all millimeters, and the order of surfaces S1-S13 indicates the surfaces from the first side to the second side; an optical surface with a radius of curvature of "Infinity" refers to a planar surface. Furthermore, the single-sided focal length of the image-side surface S3 of the second lens L2 is -1.37 mm, and the single-sided focal length of the object-side surface S13 of the seventh lens L7 is -3.11 mm. Further, the sum of the ratio of the optical power to Abbe number of the fourth lens and the ratio of the optical power to Abbe number of the fifth lens is -0.009.

[0097] In the embodiments described in this specification, the second lens L2 is an aspherical lens. Specific parameters for the aspherical lens are shown in Table 6.

[0098] Table 6 Aspheric coefficients of the optical imaging lens group in Example 2 (Table 6)

[0099] Surface serial number K A4 A6 A8 A10 S3 -0.774 0.069 0.057 -0.485 0.609 S4 -0.731 0.002 -0.002 0.0007 -0.0001

[0100] It should be noted that Table 6 contains detailed data on the image side S3 and object side S4 of the second lens L2 in the optical imaging lens group of Embodiment 2.

[0101] 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; among them, the Modulation Transfer Function (MTF) curve represents the overall resolution level of an optical system, the Field Curve Distortion curve represents the F-Tan (theta) distortion magnitude (percentage) under different field angles, and the Vertical Chromatic Aberration curve represents the magnitude of chromatic aberration in the direction perpendicular to the axial direction.

[0102] 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.

[0103] 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 first 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.

[0104] Example 3

[0105] Figure 11 This is a schematic diagram of an optical imaging lens assembly provided in Embodiment 3. The optical imaging lens assembly includes seven lenses arranged sequentially along the optical axis, namely, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 arranged coaxially from the first side to the second side. The focal lengths of the first lens L1 to the seventh lens L7 are positive, negative, positive, positive, negative, positive, and negative, respectively. Further, an aperture stop is located on the first side of the optical imaging lens assembly. The object-side surface S2 of the first lens L1, the object-side surface S4 of the second lens L2, and the object-side surface S6 of the third lens L3 are all convex surfaces. The image-side surface S1 of the first lens L1 is concave, the image-side surface S3 of the second lens L2 is concave, and the image-side surface S5 of the third lens L3 is planar. The second lens L2 is a meniscus aspherical lens that curves towards the aperture stop. The fourth lens L4 and the fifth lens L5 are cemented lenses. The fourth lens L4 is a biconvex lens, and the fifth lens L5 is a biconcave lens. The object-side surface of the fourth lens L4 and the image-side surface of the fifth lens L5 share a common surface S8. The image-side surface S10 of the sixth lens L6 and the image-side surface S12 of the seventh lens L7 are both convex surfaces. The object-side surface S11 of the sixth lens L6 is concave, and the object-side surface S13 of the seventh lens L7 is concave. The seventh lens is meniscus and curves towards the curved image surface. It should be noted that the surface shape of the lenses in the optical imaging lens group is not limited to the above description and can be adjusted appropriately. For example, the image-side surface of the first lens L1 can also be flat, and the image-side surface of the third lens L3 can also be concave or convex.

[0106] Furthermore, in this embodiment, the second side of the optical imaging lens group corresponds to the curved image at the light source end. The lens of the optical imaging lens group has an F / # of 1.77mm, a total focal length of 1.59mm, a working distance of 0.42mm, and a full field of view of 36 degrees.

[0107] The relationship between the focal length of each lens and the total focal length of the lens in this embodiment is shown in Table 7:

[0108] Table 7 shows the relationship between the focal length of each lens element and the total focal length of the lens in this embodiment.

[0109]

[0110] Furthermore, in this embodiment of the invention, the preferred parameters for the radius of curvature, thickness, refractive index, and Abbe number of each lens in the optical imaging lens group for imaging curved surface images are shown in Table 8:

[0111] Table 8 shows the structural parameters of the optical imaging lens assembly in Example 3.

[0112]

[0113] It should be noted that Table 8 contains detailed structural data of the optical imaging lens assembly of Embodiment 3. The units for radius of curvature, thickness, and focal length are all millimeters, and the order of surfaces S1-S13 indicates the surfaces from the first side to the second side; an optical surface with a radius of curvature of "Infinity" refers to a planar surface. Furthermore, the single-sided focal length of the image-side surface S3 of the second lens L2 is -1.60 mm, and the single-sided focal length of the object-side surface S13 of the seventh lens L7 is -2.99 mm. Further, the sum of the ratio of the optical power to Abbe number of the fourth lens and the ratio of the optical power to Abbe number of the fifth lens is -0.011.

[0114] In the embodiments described in this specification, the second lens L2 is an aspherical lens. Specific parameters for the aspherical lens are shown in Table 3.

[0115] Table 9. Aspheric coefficients of the optical imaging lens group in Example 3.

[0116] Surface serial number K A4 A6 A8 A10 S3 -0.517 0.021 0.208 -0.190 0.187 S4 -0.314 0.004 0.00002 0.003 0.00003

[0117] It should be noted that Table 9 contains detailed data on the image side S3 and object side S4 of the second lens L2 in the optical imaging lens assembly of Embodiment 3.

[0118] 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; among them, the Modulation Transfer Function (MTF) curve represents the overall resolution level of an optical system, the Field Curve Distortion curve represents the F-Tan (theta) distortion magnitude (percentage) under different field angles, and the Vertical Chromatic Aberration curve represents the magnitude of chromatic aberration in the direction perpendicular to the axial direction.

[0119] 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.

[0120] 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 first 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.

[0121] Example 4

[0122] Figure 15 This is a schematic diagram of an optical imaging lens assembly provided in Embodiment 4. The optical imaging lens assembly includes seven lenses arranged sequentially along the optical axis, namely, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 arranged coaxially from the first side to the second side. The focal lengths of the first lens L1 to the seventh lens L7 are positive, negative, positive, negative, positive, positive, and negative, respectively. Further, an aperture stop is located on the first side of the optical imaging lens assembly. The object-side surface S2 of the first lens L1, the object-side surface S4 of the second lens L2, and the object-side surface S6 of the third lens L3 are all convex surfaces. The image-side surface S1 of the first lens L1 is concave, the image-side surface S3 of the second lens L2 is concave, and the image-side surface S5 of the third lens L3 is convex. The second lens L2 is a meniscus aspherical lens that curves towards the aperture stop. The fourth lens L4 and the fifth lens L5 are cemented lenses. The fourth lens L4 is a biconcave lens, and the fifth lens L5 is a biconvex lens. The object-side surface of the fourth lens L4 and the image-side surface of the fifth lens L5 share a common surface S8. The image-side surface S10 of the sixth lens L6 and the image-side surface S12 of the seventh lens L7 are both convex surfaces. The object-side surface S11 of the sixth lens L6 and the object-side surface S13 of the seventh lens L7 are concave surfaces. The sixth lens L6 and the seventh lens L7 are meniscus-shaped and curved towards the curved image surface. It should be noted that the surface shape of the lenses in the optical imaging lens group is not limited to the above description and can be adjusted appropriately. For example, the image-side surface of the first lens L1 can also be flat, and the image-side surface of the third lens L3 can also be concave or flat.

[0123] Furthermore, in this embodiment, the second side of the optical imaging lens group corresponds to the curved image at the light source end. The lens of the optical imaging lens group has an F / # of 1.73mm, a total focal length of 1.56mm, a working distance of 0.3mm, and a full field of view of 36 degrees.

[0124] The relationship between the focal length of each lens and the total focal length of the lens in this embodiment is shown in Table 10:

[0125] Table 10 shows the relationship between the focal length of each lens element and the total focal length of the lens in this embodiment.

[0126]

[0127] Furthermore, in this embodiment of the invention, the preferred parameters for the radius of curvature, thickness, refractive index, and Abbe number of each lens in the optical imaging lens group for imaging curved surface images are shown in Table 11:

[0128] Table 11 Structural parameters of the optical imaging lens assembly in Example 4

[0129]

[0130]

[0131] It should be noted that Table 11 contains detailed structural data for the optical imaging lens assembly of Embodiment 4. The units for radius of curvature, thickness, and focal length are all millimeters, and the order of surfaces S1-S13 indicates the surfaces from the first side to the second side; an optical surface with a radius of curvature of "Infinity" refers to a planar surface. Furthermore, the single-sided focal length of the object-side surface S2 of the first lens L1 is 2.18 mm, the single-sided focal length of the image-side surface S3 of the second lens L2 is -1.51 mm, and the single-sided focal length of the object-side surface S13 of the seventh lens L7 is -2.5 mm. Further, the sum of the ratio of the optical power to Abbe number of the fourth lens and the ratio of the optical power to Abbe number of the fifth lens is -0.023.

[0132] In the embodiments described in this specification, the second lens L2 is an aspherical lens. Specific parameters for the aspherical lens are shown in Table 12.

[0133] Table 12 Aspheric coefficients of the optical imaging lens group in Example 4

[0134] Surface serial number K A4 A6 A8 A10 S3 -2.500 -0.761 0.817 -1.440 0.827 S4 -3.288 -0.048 0.009 -0.002 0.0003

[0135] It should be noted that Table 12 contains detailed data on the image side S3 and object side S4 of the second lens L2 in the optical imaging lens group of Embodiment 4.

[0136] Furthermore, tests showed that when the image light corresponding to the scanning surface is projected using the aforementioned optical imaging lens group, its optical transfer function curve is as follows: Figure 16 As shown, the field distortion curve is as follows: Figure 17 As shown, the vertical axis color difference curve is as follows: Figure 18 As shown; among them, the Modulation Transfer Function (MTF) curve represents the overall resolution level of an optical system, the Field Curve Distortion curve represents the F-Tan (theta) distortion magnitude (percentage) under different field angles, and the Vertical Chromatic Aberration curve represents the magnitude of chromatic aberration in the direction perpendicular to the axial direction.

[0137] Depend on Figures 16-18Observations show that the optical imaging lens group in Example 4 has good imaging resolution and small optical system distortion and chromatic aberration across the entire field of view. Therefore, the optical imaging lens group can clearly image the scanning surface image of the fiber optic scanner and has good imaging effect.

[0138] 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 first 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.

[0139] Example 5

[0140] Figure 19 This is a schematic diagram of an optical imaging lens assembly provided in Embodiment 5. The optical imaging lens assembly includes seven lenses arranged sequentially along the optical axis, namely, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 arranged coaxially from the first side to the second side. The focal lengths of the first lens L1 to the seventh lens L7 are positive, negative, positive, negative, positive, positive, and negative, respectively. Further, an aperture stop is located on the first side of the optical imaging lens assembly. The object-side surface S2 of the first lens L1 and the object-side surface S4 of the second lens L2 are both convex surfaces. The image-side surface S1 of the first lens L1 is concave, and the image-side surface S3 of the second lens L2 is concave. The second lens L2 is a meniscus aspherical lens that curves towards the aperture stop. The third lens L3 and the fourth lens L4 are cemented lenses; the third lens L3 is a biconvex lens, and the fourth lens is a biconcave lens. The fifth lens L5 is a biconvex lens. The image-side surface S10 of the sixth lens L6 and the image-side surface S12 of the seventh lens L7 are both convex. The object-side surface S11 of the sixth lens L6 is concave, and the object-side surface S13 of the seventh lens L7 is concave. The seventh lens is meniscus-shaped and curves towards the curved image surface. It should be noted that the surface shape of the lenses in the optical imaging lens group is not limited to the above description and can be adjusted appropriately. For example, the image-side surface of the first lens L1 can also be flat, and the image-side surface of the third lens L3 can also be concave or flat.

[0141] Furthermore, in this embodiment, the second side of the optical imaging lens group corresponds to the curved image at the light source end. The lens of the optical imaging lens group has an F / # of 1.8mm, a total focal length of 1.63mm, a working distance of 0.3mm, and a full field of view of 36 degrees. It should be noted that, in this embodiment, the working distance refers to the distance on the optical axis between the concave surface of the second side of the optical image group (i.e., the object side surface of the seventh lens) and the curved image.

[0142] The relationship between the focal length of each lens and the total focal length of the lens in this embodiment is shown in Table 13:

[0143] Table 13 shows the relationship between the focal length of each lens element and the total focal length of the lens in this embodiment.

[0144]

[0145] Furthermore, in the embodiments of this specification, the preferred parameters for the radius of curvature, thickness, refractive index, and Abbe number of each lens in the optical imaging lens group for imaging curved surface images are shown in Table 14:

[0146] Table 14 Structural parameters of the optical imaging lens assembly in Example 5

[0147]

[0148] It should be noted that Table 14 contains detailed structural data of the optical imaging lens assembly in Embodiment 5. The units for radius of curvature, thickness, and focal length are all millimeters, and the order of surfaces S1-13 indicates the surfaces from the first side to the second side; an optical surface with a radius of curvature of "Infinity" refers to a planar surface. Furthermore, the single-sided focal length of the image-side surface S3 of the second lens L2 is -1.46 mm, and the single-sided focal length of the object-side surface S13 of the seventh lens L7 is -2.80 mm. Further, the sum of the ratio of the optical power to Abbe number of the fourth lens and the ratio of the optical power to Abbe number of the fifth lens is -0.023.

[0149] In the embodiments described in this specification, the second lens L2 is an aspherical lens. Specific parameters for the aspherical lens are detailed in Table 15.

[0150] Table 15 Aspheric coefficients of the optical imaging lens group in Example 5

[0151] Surface serial number K A4 A6 A8 A10 S3 -1.975 -0.501 0.571 -0.568 0.500 S4 -0.968 -0.004 -0.0002 0.0006 -0.0001

[0152] It should be noted that Table 25 contains detailed data on the image side S3 and object side S4 of the second lens L2 in the optical imaging lens group of Example 5.

[0153] 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 20 As shown, the field distortion curve is as follows: Figure 21 As shown, the vertical axis color difference curve is as follows: Figure 22 As shown; among them, the Modulation Transfer Function (MTF) curve represents the overall resolution level of an optical system, the Field Curve Distortion curve represents the F-Tan (theta) distortion magnitude (percentage) under different field angles, and the Vertical Chromatic Aberration curve represents the magnitude of chromatic aberration in the direction perpendicular to the axial direction.

[0154] Depend on Figures 20-21 Observations show that the optical imaging lens group in Example 5 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.

[0155] 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 first 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.

[0156] Example 6

[0157] Figure 24 This is a schematic diagram of an optical imaging lens assembly provided in Embodiment Six. The optical imaging lens assembly includes seven lenses arranged sequentially along the optical axis, namely, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 arranged coaxially from the first side to the second side. The focal lengths of the first lens L1 to the seventh lens L7 are positive, negative, negative, positive, positive, positive, and negative, respectively. Further, an aperture stop is located on the first side of the optical imaging lens assembly. The object-side surface S2 of the first lens L1 and the object-side surface S4 of the second lens L2 are both convex. The image-side surface S1 of the first lens L1 is concave, and the image-side surface S3 of the second lens L2 is concave. The second lens L2 is a meniscus aspherical lens that curves towards the aperture stop. The third lens L3 and the fourth lens L4 are cemented lenses; the third lens L3 is a biconcave lens, and the fourth lens L4 is a biconvex lens. The image-side surface of the fifth lens L5 is convex, and the object-side surface of the fifth lens is concave. The image-side surface S10 of the sixth lens L6 and the image-side surface S12 of the seventh lens L7 are both convex. The object-side surface S11 of the sixth lens L6 is concave, and the object-side surface S13 of the seventh lens L7 is concave. The seventh lens is meniscus and curves towards the curved image surface. It should be noted that the surface shapes of the lenses in the optical imaging lens group are not limited to the above description and can be adjusted appropriately. For example, the image-side surface of the first lens L1 can also be flat, the image-side surface of the third lens L3 can also be flat, and the object-side surface of the fifth lens L5 can also be flat.

[0158] Furthermore, in this embodiment, the second side of the optical imaging lens group corresponds to the curved image at the light source end. The lens of the optical imaging lens group has an F / # of 1.72mm, a total focal length of 1.56mm, a working distance of 0.34mm, and a full field of view of 36 degrees.

[0159] The relationship between the focal length of each lens and the total focal length of the lens in this embodiment is shown in Table 16:

[0160] Table 16 shows the relationship between the focal length of each lens element and the total focal length of the lens in this embodiment.

[0161]

[0162] Furthermore, in the embodiments of this specification, the preferred parameters for the radius of curvature, thickness, refractive index, and Abbe number of each lens in the optical imaging lens group for imaging curved surface images are shown in Table 17:

[0163] Table 17 Structural parameters of the optical imaging lens assembly in Example 6

[0164]

[0165]

[0166] It should be noted that Table 17 provides detailed structural data for the optical imaging lens assembly of Embodiment Six. In this data, the units for radius of curvature, thickness, and focal length are all millimeters, and the order of surfaces S1-13 indicates the surfaces from the first side to the second side; an optical surface with a radius of curvature of "Infinity" refers to a planar surface. Furthermore, the single-sided focal length of the image-side surface S3 of the second lens L2 is -1.51, and the single-sided focal length of the object-side surface S13 of the seventh lens L7 is -2.58. Further, the sum of the ratio of the optical power to Abbe number of the fourth lens and the ratio of the optical power to Abbe number of the fifth lens is -0.023.

[0167] In the embodiments described in this specification, the second lens L2 is an aspherical lens. Specific parameters regarding the aspherical lens are shown in Table 18.

[0168] Table 18 Aspheric coefficients of the optical imaging lens group in Example 6

[0169] Surface serial number K A4 A6 A8 A10 S3 -1.051 -0.038 -1.297 0.14 1.702 S4 -1.088 0.0006 0.0003 0.001 -0.0003

[0170] It should be noted that Table 18 contains detailed data on the image-side surface S3 and the object-side surface S4 of the second lens L2 in the optical imaging lens assembly of Embodiment Six.

[0171] 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 24 As shown, the field distortion curve is as follows: Figure 25 As shown, the vertical axis color difference curve is as follows: Figure 26 As shown; among them, the Modulation Transfer Function (MTF) curve represents the overall resolution level of an optical system, the Field Curve Distortion curve represents the F-Tan (theta) distortion magnitude (percentage) under different field angles, and the Vertical Chromatic Aberration curve represents the magnitude of chromatic aberration in the direction perpendicular to the axial direction.

[0172] Depend on Figures 24-26 Observations show that the optical imaging lens group in Example 5 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.

[0173] 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 first 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.

[0174] Scanning display device

[0175] The aforementioned optical imaging lens assembly can be used in conjunction with a fiber optic scanner (or a corresponding fiber optic scanning module) to constitute the scanning display device in the embodiments of this application (e.g., Figure 1a , 1b As shown, the optical imaging lens group is positioned on the output optical path of the fiber optic scanner. The second side of the optical imaging lens group faces the scanning output direction of the fiber optic scanner. Preferably, the optical imaging lens group is coaxial with the central optical axis of the fiber optic scanner. Of course, the structure and general principle of the fiber optic scanner can be found in the aforementioned... Figure 1a , 1b The corresponding content will not be elaborated on here.

[0176] In another possible implementation, this application also provides an application of the scanning display device as described above, that is, the scanning display device is configured in the field of projection, specifically configured and applied in vehicle projection. It can be configured not only in the vehicle, such as on the exterior of the vehicle body or in the relevant position of the head-up display, but also in the vehicle interior for projection display. The specific configuration can be flexibly set according to the display requirements of the vehicle projection.

[0177] In some embodiments, the scanning display device can be applied to vehicles, including but not limited to automobiles, motorcycles, electric bicycles, balance scooters, and skateboards. In some embodiments, the vehicle-mounted projection system can also be applied to other vehicles with transportation capabilities, such as aircraft, ships, and wheelchairs. Taking an automobile as a specific example, the optical imaging module of the scanning display device can be located at the door, front, or rear of the vehicle to project images onto the ground around the vehicle. It should be noted that the image corresponding to the imaging end is a planar image, and the corresponding planar image carrier can be such as a projection screen, a screen, the ground, or a glass surface. It should also be noted that in specific applications of the scanning display device, the number of scanning display devices can be one or more groups. When the scanning display devices are located at different positions on the carrier (e.g., a vehicle), the specifications of the fiber optic scanner, the distribution of each lens in the optical imaging lens group, and the parameters can be adaptively adjusted according to the specific scenario.

[0178] The above description is merely a preferred embodiment of this application. Each embodiment is only used to illustrate the technical solution of this application and is not intended to limit this application. Any technical solution that can be obtained by those skilled in the art through logical analysis, reasoning or effective experimentation based on the concept of this application should be within the scope of this application.

[0179] The various embodiments in this application are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0180] The terms "first," "second," "first," or "second" as used in the various embodiments of this disclosure may modify various components regardless of their order and / or importance, but these terms do not limit the corresponding components. The above terms are configured only for the purpose of distinguishing one component from another.

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, a sixth lens, and a seventh lens arranged coaxially along a first side to a second side. The first side is the imaging side, and the second side corresponds to the curved image at the light source end. The curved image is formed by a fiber optic scanner. The second lens is a meniscus aspherical lens that bends toward the first side. The object-side surfaces of both the first and second lenses are convex, the image-side surface of the first lens is concave or flat, and the image-side surface of the second lens is concave. The fourth lens and one of the adjacent lenses are combined to form a cemented lens, and the other is a positive lens; The image-side surfaces of the sixth lens and the seventh lens are both convex, and the object-side surfaces of the sixth lens and the seventh lens are both concave. The focal length of the image side of the second lens is in the range of -1.6 to -1.366, and the ratio of the radius of curvature of the object side of the seventh lens to the working distance from the seventh lens to the curved image is 3.49 to 4.

93.

2. The optical imaging lens assembly according to claim 1, characterized in that, The optical powers of the first lens, the second lens, the sixth lens, and the seventh lens are positive, negative, positive, and negative, respectively. The optical powers of the fourth lens and the fifth lens are positive and negative or negative and positive, respectively. One of the cemented lenses has a positive optical power and the other has a negative optical power.

3. The optical imaging lens assembly according to claim 2, characterized in that, The Abbe number of the positive lens in the cemented lens is greater than the Abbe number of the negative lens in the cemented lens.

4. The optical imaging lens assembly according to claim 3, characterized in that, The sum of the ratio of the optical power to the Abbe number of one of the laminated lenses and the ratio of the optical power to the Abbe number of the other laminated lens is in the range of -0.023 to -0.0088.

5. The optical imaging lens assembly according to claim 1, characterized in that, The focal length of the object side of the seventh lens is in the range of -3.11 to -2.

5.

6. The optical imaging lens assembly according to claim 1, characterized in that, The combined focal length of the sixth lens and the seventh lens is in the range of 4.75 to 14.

78.

7. The optical imaging lens assembly according to claim 1, characterized in that, An aperture is provided on the first side.

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

9. An application of the scanning display device as described in claim 8, characterized in that, The scanning display device is configured in the field of vehicle display.

Images