Collimating cylindrical lens

Abstract

The utility model discloses a collimating cylindrical lens, which comprises an outer frame, an interval lens assembly sleeved in the outer frame, and a first fixing frame and a second fixing frame which are fixed at two ends of the outer frame to fix the interval lens assembly, the first fixing frame is close to an object side, and the second fixing frame is close to an image side; the spacing lens assembly sequentially comprises a first lens, a spacing frame and a second lens from the object side to the image side along the optical axis. The first lens and the second lens are cylindrical lenses. The distance between the lenses is controlled and fixed through the spacing frame, the spacing lens assembly is fixed through the outer frame and the two fixing frames, light emitted by a two-dimensional light source is collimated into parallel light in cooperation with the lenses, the light collimation effect is better achieved, meanwhile, the focal power and the surface type of each lens are reasonably distributed, and the light collimation effect is better. According to the parameter relation of all parts in the lens, the collimation capability of the collimation cylindrical lens is effectively improved, and the collimation cylindrical lens with high reliability is obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of optical imaging, in particular to a collimating cylindrical lens. Background Art

[0002] LiDAR technology uses lasers to calculate the distance to objects. Its core technologies include single-point ranging and two-dimensional scanning. Two-dimensional scanning technology is categorized into mechanical scanning, semi-solid scanning (one dimension without moving parts), and solid-state scanning, depending on whether the scanning principle contains moving parts. Solid-state scanning uses a chip-generated light source (including linear and surface light sources) that emits light in two dimensions. Its advantages include simple structure, small size, easy integration, low cost, and high reliability. These advantages make solid-state LiDAR an important direction for the future development of LiDAR technology, especially with broad application prospects in autonomous driving and intelligent transportation systems.

[0003] Currently, there is a severe shortage of collimating cylindrical lenses that can match solid-state scanning lidars on the market, especially collimating cylindrical lenses that can match the two-dimensional light source in solid-state scanning lidars. Therefore, there is an urgent need for a collimating cylindrical lens with good reliability and excellent performance. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this application is to provide a collimating cylindrical lens to solve the problem that there is a severe lack of collimating cylindrical lenses with good reliability and excellent performance that can match solid-state scanning lidar in the current market.

[0005] In a first aspect, the present application provides a collimating cylindrical lens, comprising an outer frame, a spacer lens assembly mounted within the outer frame, and a first fixing frame and a second fixing frame fixed at both ends of the outer frame to fix the spacer lens assembly, wherein the first fixing frame is disposed near the object side, and the second fixing frame is disposed near the image side;

[0006] The spacer lens assembly includes a first lens, a spacer frame, and a second lens in sequence from the object side to the image side along the optical axis; the first lens and the second lens are both cylindrical lenses.

[0007] In one embodiment of the present application, both the first lens and the second lens have positive refractive power.

[0008] In one embodiment of the present application, the on-axis distance from the object side surface of the first lens to the image side surface of the second lens is TD, the sum of the center thicknesses of the first lens and the second lens is ΣCT, and the collimating cylindrical lens satisfies: 1.5<TD / ΣCT<2.0.

[0009] In one embodiment of the present application, the inner wall width of the first fixing frame is w1, the curvature radius of the object side of the first lens is R1, the effective focal length of the first lens is f1, and the collimating cylindrical lens satisfies: 0.8 <f1 / (w1+R1)<1.0。

[0010] In one embodiment of the present application, the height of the first fixing frame is h1, the inner wall width of the first fixing frame is w1, the curvature radius of the object side of the first lens is R1, and the collimating cylindrical lens satisfies: 1.21

[0011] In one embodiment of the present application, the height of the second fixed frame is h3, the width of the inner wall of the second fixed frame is w3, the curvature radius of the image side of the second lens is R4, and the collimating cylindrical lens satisfies: 1.21 <h3×R4 / (-1×w3)<2.95。

[0012] In one embodiment of the present application, the height of the concave step on the image side of the spacer frame is h2", the width of the inner wall of the spacer frame is w2, the radius of curvature of the object side of the second lens is R3, and the collimating cylindrical lens satisfies: 1.61 <h2"×R3 / w2<2.99。

[0013] In one embodiment of the present application, the height of the concave step on the object side of the spacer frame is h2', the inner wall width of the spacer frame is w2, the curvature radius of the image side of the first lens is R2, and the collimating cylindrical lens satisfies: 4.21 <h2'×R2 / w2<30.95。

[0014] In one embodiment of the present application, the distance between the first fixed image frame side and the spacer image frame side is EP12, the center thickness of the first lens on the optical axis is CT1, the center thickness of the second lens on the optical axis is CT2, and the collimating cylindrical lens satisfies: 1.25 <EP12 / (CT1+CT2)<1.87。

[0015] In one embodiment of the present application, the on-axis distance from the object side surface of the first lens to the image side surface of the second lens is TD, the maximum height of the collimating cylindrical lens is H, the sum of the center thicknesses of the first lens and the second lens is ∑CT, the sum of the heights of the first fixing frame, the second fixing frame, and the spacer frame is ∑h, and the collimating cylindrical lens satisfies the following conditions: 0.8<(TD / ∑CT)×(∑h / H)<1.7.

[0016] Compared with the prior art, one or more embodiments of the above solutions may have the following advantages or beneficial effects:

[0017] ​The collimating cylindrical lens provided in the embodiment of the present invention, through the arrangement of the first lens and the second lens, converts the light emitted by the two-dimensional light source on the image plane into parallel light after passing through the collimating lens, thus solving the current market problem of the urgent need for high-performance collimating cylindrical lenses that can match solid-state scanning laser radars. Furthermore, the distance between the lenses is controlled and fixed by a spacer frame, and the spacer lens assembly is fixed by an outer frame and two fixing frames, so that the light emitted by the two-dimensional light source is collimated into parallel light in cooperation with the lens, thereby better achieving the light collimation effect. At the same time, by rationally allocating the optical power and surface shape of each lens and the parameter relationship of each component in the lens, the collimating ability, assembly stability, and reliability of the collimating cylindrical lens are effectively improved.

[0018] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures specifically pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 Shown is a schematic diagram of the overall structure of the collimating cylindrical lens described in an embodiment of the present application.

[0021] Figure 2 Shown is a three-dimensional cross-sectional schematic diagram of the collimating cylindrical lens described in an embodiment of the present application.

[0022] Figure 3 Shown is a schematic diagram of the specific structure of the collimating cylindrical lens described in an embodiment of the present application.

[0023] Figure 4 Shown is a three-dimensional schematic diagram of the spacer frame in the collimating cylindrical lens described in an embodiment of the present application.

[0024] Figure 5 Shown is a schematic diagram of the dimensions of the collimating cylindrical lens described in an embodiment of the present application.

[0025] Figure 6 Shown is a schematic structural diagram of the YZ plane of the collimating cylindrical lens according to an embodiment of the present application.

[0026] Figure 7 Shown is an isometric structural diagram of the collimating cylindrical lens described in an embodiment of the present application.

[0027] Figure 8Shown is a schematic structural diagram of the XZ plane of the collimating cylindrical lens described in an embodiment of the present application.

[0028] Figure 9 It is a schematic diagram showing the structure of the XZ plane when the light of the collimating cylindrical lens described in an embodiment of the present application is tilted 5 degrees along the X direction.

[0029] Figure 10 It is a schematic diagram showing the structure of the XZ plane when the light of the collimating cylindrical lens described in an embodiment of the present application is tilted 10 degrees along the X direction.

[0030] Logo Description:

[0031] 21 is a first fixed frame, 22 is an outer frame, 23 is a spacer frame, 24 is a second fixed frame, L1 is a first lens, and L2 is a second lens. DETAILED DESCRIPTION

[0032] The following describes the implementation of the present invention in detail with reference to the accompanying drawings and examples, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. It should be noted that as long as no conflict arises, the various embodiments of the present invention and the various features in each embodiment can be combined with each other, and the resulting technical solutions are all within the scope of protection of the present invention.

[0033] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. Therefore, the illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0034] The purpose of the present invention is to provide a collimating cylindrical lens to solve the problem that there is a severe shortage of collimating cylindrical lenses with good reliability and excellent performance that can match solid-state scanning laser radars in the existing market.

[0035] The collimating cylindrical lens of the utility model can be applied to existing solid-state scanning laser radars, and can also be applied to various other line scanning light source generating devices that have good and excellent performance requirements for collimating cylindrical lenses, and no fixed restrictions are imposed on it here.

[0036] The principle and implementation of a collimating cylindrical lens of this embodiment will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can understand the collimating cylindrical lens of this embodiment without creative work.

[0037] refer to Figure 1-3As shown, this embodiment provides a collimating cylindrical lens, comprising an outer frame 22, a spacer lens assembly, a first fixed frame 21, and a second fixed frame 24. The spacer lens assembly is mounted within the outer frame 22, and the first fixed frame 21 and the second fixed frame 24 are respectively fixed to both sides of the outer frame 22 to secure the spacer lens assembly within the outer frame 22. The first fixed frame 21 is disposed near the object side of the collimating cylindrical lens, and the second fixed frame 24 is disposed near the image side of the collimating cylindrical lens.

[0038] It should be noted that the first fixing frame 21 and the second fixing frame 24 can be fixed to both sides of the outer frame 22 by screws, interference fit or other fitting methods to fix the spacer lens assembly in the outer frame 22.

[0039] Furthermore, the spacer lens assembly includes, in order from the object side to the image side along the optical axis, a first lens L1, a spacer frame 23, and a second lens L2. Both the first lens L1 and the second lens L2 have positive optical power, and both are cylindrical lenses. A cylindrical lens has curvature in one direction and is flat in a direction perpendicular to the curvature. To ensure that the collimating cylindrical lens formed by the first lens L1 and the second lens L2 has a collimating function, this embodiment requires that the collimating cylindrical lens have optical power from the object side to the image side.

[0040] refer to Figure 4 As shown, the spacer frame 23 is used to control the distance between the first lens L1 and the second lens L2, while also securing the first lens L1 and the second lens L2. Furthermore, the spacer frame 23 can be configured as a rectangular frame structure, and a concave step can be formed by shortening the length of the opposing side panels of the spacer frame 23 to achieve locking control of the first lens L1 and the second lens L2. Specifically, in this embodiment, the concave steps can be formed at both ends of the spacer frame 23 by shortening the length of the side panels of the spacer frame 23. The spacer frame 23 in this embodiment can also be configured as other frame structures and adopt other methods of forming the concave step; this embodiment does not provide a fixed configuration for it.

[0041] In one embodiment, the first lens L1 and the second lens L2 in this embodiment of the collimating cylindrical lens must also satisfy 1.5 < TD / ∑CT < 2.0, where TD is the on-axis distance from the object-side surface of the first lens L1 to the image-side surface of the second lens L2, and ∑CT is the sum of the median thicknesses of the first lens L1 and the second lens L2. This configuration allows the collimating cylindrical lens of this embodiment to be constructed with a reasonable lens thickness distribution within a given lens length, resulting in a streamlined lens structure and easier assembly.

[0042] In one embodiment, the collimating cylindrical lens of this embodiment further needs to satisfy: 0.8 < f1 / (w1 + R1) < 1.0. Where w1 is the inner wall width of the first fixing frame 21, R1 is the curvature radius of the object side surface of the first lens L1, and f1 is the effective focal length of the first lens L1. The above setting reduces the stray light entering the collimating cylindrical lens by setting the inner wall width of the first fixing frame 21, also avoids the first fixing frame 21 from blocking the signal light, and at the same time limits the overall width of the collimating cylindrical lens.

[0043] In one embodiment, the collimating cylindrical lens of this embodiment further needs to satisfy: 1.21 < h1×R1 / w1 < 2.95. Where h1 is the height of the first fixing frame 21, w1 is the inner wall width of the first fixing frame 21, and R1 is the curvature radius of the object side surface of the first lens L1. The above setting enables the height of the first fixing frame 21 to be set by referring to the curvature radius of the object side surface of the first lens L1 and the inner wall width of the first fixing frame 21. This setting not only controls the entry of stray light, but also protects the surface of the first lens L1 through the design of the height of the first fixing frame 21, reducing the risk of direct collision.

[0044] In one embodiment, the collimating cylindrical lens of this embodiment further needs to satisfy: 1.21 < h3×R4 / (-1×w3) < 2.95. Where h3 is the height of the second fixing frame 24, w3 is the inner wall width of the second fixing frame 24, and R4 is the curvature radius of the image side surface of the second lens L2. The above setting enables the height of the second fixing frame 24 to be set by referring to the curvature radius of the image side surface of the second lens L2 and the inner wall width of the second fixing frame 24. This setting not only controls the entry of stray light, but also protects the surface of the second lens L2 through the design of the height of the second fixing frame 24, reducing the risk of direct collision.

[0045] In one embodiment, the collimating cylindrical lens of this embodiment further needs to satisfy: 1.61 < h2"×R3 / w2 < 2.99. Where h2" is the height of the concave step on the image side of the spacer frame 23, w2 is the inner wall width of the spacer frame 23, and R3 is the curvature radius of the object side surface of the second lens L2. The above setting enables the height of the concave step on the image side of the spacer frame 23 to be set by referring to the curvature radius of the object side surface of the second lens L2 and the inner wall width of the spacer frame 23, which not only ensures the reliability of the fixation of the spacer frame 23, but also avoids interference when the concave step surface on the object side of the spacer frame 23 is installed with the image side surface of the second lens L2.

[0046] In one embodiment, the collimating cylindrical lens of this embodiment further needs to satisfy: 4.21 < h2'×R2 / w2 < 30.95. Where h2' is the height of the concave step on the object side of the spacer frame 23, w2 is the inner wall width of the spacer frame 23, and R2 is the radius of curvature of the image side surface of the first lens L1. The above settings enable the height of the concave step on the object side of the spacer frame 23 to be set referring to the radius of curvature of the image side surface of the first lens L1 and the inner wall width of the spacer frame 23, which not only ensures the reliability of the fixation of the spacer frame 23 but also avoids interference when the concave step surface on the object side of the spacer frame 23 is installed with the image side surface of the first lens L1.

[0047] In one embodiment, the collimating cylindrical lens of this embodiment further needs to satisfy: 1.25 < EP12 / (CT1 + CT2) < 1.87. Where EP12 is the distance between the image side surface of the first fixing frame 21 and the image side surface of the spacer frame 23, CT1 is the central thickness of the first lens L1 on the optical axis, and CT2 is the central thickness of the second lens L2 on the optical axis. The above settings improve the processability of the lens by adjusting the central thicknesses of the first lens L1 and the second lens L2; by setting the distance between the image side plane of the first fixing frame 21 and the image side surface of the spacer frame 23 within a reasonable range, it is beneficial to control the overall height of the cylindrical lens and at the same time ensures the assembly stability of the collimating cylindrical lens.

[0048] In one embodiment, the collimating cylindrical lens of this embodiment further needs to satisfy: 0.8 < (TD / ∑CT)×(∑h / H) < 1.7. Where TD is the axial distance from the object side surface of the first lens L1 to the image side surface of the second lens L2, the maximum height of the collimating cylindrical lens is H, ∑CT is the sum of the central thicknesses of the first lens L1 and the second lens L2, and ∑h is the total height of the first fixing frame 21, the second fixing frame 24, and the spacer frame 23. The above settings control the maximum height of the lens barrel by controlling the axial distance from the object side surface of the first lens L1 to the image side surface of the second lens L2, thereby achieving the purpose of controlling the overall length of the lens and improving the space utilization rate; at the same time, by reasonably setting the thicknesses of the fixing frames and the spacer frame 23, the distribution of the overall structure of the collimating cylindrical lens is controlled, reducing the structural difference of the collimating cylindrical lens and improving the stability of the lens in high-temperature and high-humidity environments, and enhancing product reliability.

[0049] In addition to the above settings for each spacer and lens, this embodiment also makes the following settings for each lens: Specifically, the object side surface of the first lens L1 can be set as a convex surface, and the image side surface of the first lens L1 can be set as a concave surface, that is, the first lens L1 can be set as a convex-concave cylindrical lens. At the same time, the object side surface of the second lens L2 can also be set as a convex surface, and the image side surface of the second lens L2 can be set as a convex surface, that is, the second lens L2 can be set as a convex-convex cylindrical lens.

[0050] In one embodiment, the first lens L1 and the second lens L2 in this embodiment can both be set as plastic lenses. This setting not only ensures the collimation effect of the collimating cylindrical lens, but also minimizes the manufacturing cost of the collimating cylindrical lens as much as possible, reduces the total length of the collimating cylindrical lens, and is beneficial to reducing the total weight of the collimating cylindrical lens.

[0051] In one embodiment, an aperture is further provided inside the collimating cylindrical lens, and specifically, the aperture is disposed on the object side surface of the first lens L1.

[0052] When the collimating cylindrical lens of this embodiment is actually used, the light emitted by the two-dimensional light source located on the image plane becomes parallel light after passing through the collimating cylindrical lens, and the working wavelength band of this collimating cylindrical lens is 1528nm - 1568nm

[0053] In one embodiment, the first lens L1 in the collimating cylindrical lens also needs to satisfy ET1 / CT1 > 0.2, where ET1 is the edge thickness of the first lens L1, and CT1 is the central thickness of the first lens L1 on the optical axis. This setting can effectively prevent the edge of the first lens L1 from being too thin during manufacturing, resulting in a reduction in the yield rate of the collimating cylindrical lens, and at the same time effectively improves the manufacturability of the first lens L1.

[0054] In one embodiment, the second lens L2 in the collimating cylindrical lens also needs to satisfy ET2 / CT2 > 0.2, where ET2 is the edge thickness of the second lens L2, and CT2 is the central thickness of the second lens L2 on the optical axis. This setting can effectively prevent the edge of the second lens L2 from being too thin during manufacturing, resulting in a reduction in the yield rate of the collimating cylindrical lens, and at the same time effectively improves the manufacturability of the second lens L2.

[0055] In one embodiment, the collimating cylindrical lens also needs to satisfy 1 < TD / f < 3, where f is the effective focal length of the collimating cylindrical lens, and TD is the axial distance from the object side of the first lens L1 to the image side of the second lens L2. This setting can not only avoid the collimating cylindrical lens from being too long, but also obtain a larger focal length while minimizing the aperture of the collimating cylindrical lens as much as possible, making the collimating cylindrical lens perform better.

[0056] In one embodiment, the collimating cylindrical lens also satisfies 0.3 < NA < 0.6, where NA is the numerical aperture of the collimating cylindrical lens. This setting can make the collimating cylindrical lens have a large numerical aperture, and this setting can ensure that the collimating cylindrical lens can collimate a two-dimensional light source with a large numerical aperture.

[0057] In one embodiment, the collimating cylindrical lens also satisfies 8mm < f < 12mm, where f is the effective focal length of the collimating cylindrical lens.

[0058] Those skilled in the art will appreciate that the number of lenses comprising the collimating cylindrical lens can be varied to achieve the various results and advantages described herein without departing from the claimed technical solutions. For example, while two lenses are used as an example in the embodiments, the collimating cylindrical lens is not limited to two lenses and can include other numbers of lenses if desired.

[0059] In order to more clearly understand the collimating cylindrical lens of this embodiment, in this embodiment, the collimating cylindrical lens along the object side to the image side direction is set as the Z axis, the two-dimensional light source scanning direction is set as the X axis, and the direction perpendicular to the X axis and the Z axis is set as the Y axis. Figure 6 、 Figure 7 、 Figure 8 / Figure 9 / Figure 10 The structural schematic diagrams of the lens at different viewing angles (i.e., coordinate planes) are given respectively (taking a line light source as an example).

[0060] In actual use, the two-dimensional light source of the solid-state scanning laser radar at different heights on the image plane will cause the collimated parallel light to have different emission angles along the Y direction. The collimating cylindrical lens of this embodiment supports the emission angle of the parallel light along the Y direction to be ±15 degrees, while the two-dimensional light source has a scanning angle of ±10 degrees along the X direction. Figure 8 、 Figure 9 and Figure 10 Schematic diagrams of the lens seen in the XZ plane when a two-dimensional light source scans 0 degrees, 5 degrees, and 10 degrees along the X direction.

[0061] This embodiment of the collimating cylindrical lens ensures that all light rays from a two-dimensional light source are collimated into parallel rays when scanning along the X-direction, ensuring excellent collimation. Because this embodiment of the collimating cylindrical lens utilizes an inverse design, the energy enclosed by the image plane along the Y-direction can be used as a primary indicator for evaluating lens performance.

[0062] On this basis, a specific design example of a lens in a collimating cylindrical lens is given below with reference to the above settings.

[0063] refer to Figure 6 As shown in FIG. 1 , the collimating cylindrical lens of the specific example includes a first lens L1L1 and a second lens L2 in sequence from the object side to the image side along the optical axis.

[0064] The first lens L1 and the second lens L2 are both cylindrical lenses. The first lens L1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens L2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex; S5 is the image surface. The first and second lenses L1 and L2 are placed in parallel, resulting in a collimating cylindrical lens with optical power extending from the object side to the image side, while having no optical power perpendicular to the direction of optical power.

[0065] refer to Figure 5 As shown, H represents the maximum height of the collimating cylindrical lens; W0 represents the outer width of the collimating cylindrical lens; w0 represents the inner wall width of the outer frame 22; h0 represents the height of the outer frame 22; w1 represents the inner wall width of the first fixed frame 21; h1 represents the height of the first fixed frame 21; w2 represents the inner wall width of the spacing frame 23; h2 represents the height of the spacing frame 23; h2' represents the height of the concave step on the object side of the spacing frame 23; h2" represents the height of the concave step on the image side of the spacing frame 23; h3 represents the height of the second fixed frame 24; w3 represents the inner wall width of the second fixed frame 24.

[0066] Table 1 shows the basic parameters of a collimating cylindrical lens of a specific example, wherein the units of the curvature radius, thickness, and effective focal length are all in millimeters (mm).

[0067]

[0068] Table 1

[0069] Table 2 shows the high-order coefficients a4, a6, a8 and a9 of the object-side surface S1 and image-side surface S2 of the first lens L1, and the object-side surface S3 and image-side surface S4 of the second lens L2 that can be used in the above specific example. 10 .

[0070] Face number <![CDATA[a4]]> <![CDATA[a6]]> <![CDATA[a8]]> <![CDATA[a 10 ]]> S1 -1.1E-04 -4.3E-06 9.8E-08 -2.8E-09 S2 -3.8E-05 -6.8E-06 2.5E-07 -5.9E-09 S3 -5.88E-05 4.06E-06 -1.28E-07 5.16E-09 S4 8.04E-04 -1.51E-05 5.74E-07 -7.39E-09

[0071] Table 2

[0072] The main value parameters in the specific example are as follows: the effective focal length f of the collimating cylindrical lens is 9.3 mm, the total width of the collimating cylindrical lens is 24 mm, the half image height of the collimating cylindrical lens is 2.44 mm, and the numerical aperture NA of the collimating cylindrical lens is 0.47.

[0073] Table 3 shows the basic parameters of the lens barrel and spacers in a specific example of a collimating cylindrical lens.

[0074]

[0075]

[0076] Table 3

[0077] The specific values ​​of some calculation parameters in the above table are:

[0078] The effective focal length f1 of the first lens L1 is 21.43 mm, the radius of curvature R1 of the object side surface of the first lens L1 is 11.1 mm, the radius of curvature R2 of the image side surface of the first lens L1 is 389.6 mm, the radius of curvature R3 of the object side surface of the second lens L2 is 6.7 mm, the radius of curvature R4 of the image side surface of the second lens L2 is -20.9 mm, the distance EP12 between the image side surface of the first fixed frame 21 and the image side surface of the spacer frame 23 is 12.05 mm, the center thickness CT1 of the first lens L1 on the optical axis is 4 mm, the center thickness CT2 of the second lens L2 on the optical axis is 4 mm, and the on-axis distance TD from the object side surface of the first lens L1 to the image side surface of the second lens L2 is 14.6 mm.

[0079] The collimating cylindrical lens in the specific example also meets the following requirements:

[0080] TD / ΣCT=1.827, where TD is the axial distance from the object-side surface of the first lens L1 to the image-side surface of the second lens L2, and ΣCT is the sum of the center thicknesses of the first lens L1 and the second lens L2.

[0081] ET1 / CT1=0.675, where ET1 is the edge thickness of the first lens L1, and CT1 is the center thickness of the first lens L1 on the optical axis.

[0082] ET2 / CT2=0.28, where ET2 is the edge thickness of the second lens L2, and CT2 is the center thickness of the second lens L2 on the optical axis.

[0083] TD / f=1.572, where f is the effective focal length of the collimating cylindrical lens, and TD is the on-axis distance from the object-side surface of the first lens L1 to the image-side surface of the second lens L2.

[0084] NA=0.47, where NA is the numerical aperture of the collimating cylindrical lens.

[0085] f=9.3, where f is the effective focal length of the collimating cylindrical lens.

[0086] The collimating cylindrical lens of the specific example can collimate the light into parallel light when the two-dimensional light source is scanned along the X direction, and can ensure a good collimation effect.

[0087] The collimating cylindrical lens provided in the embodiment of the utility model, by arranging the first lens and the second lens, converts the light emitted by the two-dimensional light source on the image plane into parallel light after passing through the collimating lens, thus solving the problem of the current market's urgent need for a high-performance collimating cylindrical lens that can match solid-state scanning laser radar. The distance between the lenses is further controlled and fixed by a spacer frame, and the spacer lens assembly is fixed by an outer frame and two fixed frames, so that the light emitted by the two-dimensional light source can be collimated into parallel light in cooperation with the lens, thereby better achieving the light collimation effect. At the same time, by rationally allocating the optical focal length and surface shape of each lens and the parameter relationship of each component in the lens, the collimating ability of the collimating cylindrical lens is effectively improved, and a highly reliable collimating cylindrical lens is obtained.

[0088] Although the embodiments disclosed in the present invention are as described above, the contents described are merely embodiments for facilitating understanding of the present invention and are not intended to limit the present invention. Any person skilled in the art of the present invention may make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the present invention. However, the scope of protection of the present invention shall still be based on the scope defined by the appended claims.

Claims

1. A collimating cylindrical lens, characterized in that: The device comprises an outer frame, a spacer lens assembly sleeved in the outer frame, and a first fixing frame and a second fixing frame fixed at both ends of the outer frame to fix the spacer lens assembly, wherein the first fixing frame is arranged close to the object side and the second fixing frame is arranged close to the image side; The spacer lens assembly includes a first lens, a spacer frame, and a second lens in sequence from the object side to the image side along the optical axis; the first lens and the second lens are both cylindrical lenses.

2. The collimating cylindrical lens according to claim 1, wherein: The first lens and the second lens both have positive refractive power.

3. The collimating cylindrical lens according to claim 1, wherein: The axial distance from the object side surface of the first lens to the image side surface of the second lens is TD, the sum of the center thicknesses of the first lens and the second lens is ΣCT, and the collimating cylindrical lens satisfies: 1.5<TD / ΣCT<2.

0.

4. The collimating cylindrical lens according to claim 1, wherein: The inner wall width of the first fixed frame is w1, the curvature radius of the object side of the first lens is R1, the effective focal length of the first lens is f1, and the collimating cylindrical lens satisfies: 0.8 <f1 / (w1+R1)<1.0。 5. The collimating cylindrical lens according to claim 1, wherein: The height of the first fixing frame is h1, the inner wall width of the first fixing frame is w1, the curvature radius of the object side of the first lens is R1, and the collimating cylindrical lens satisfies: 1.21 <h1×R1 / w1<2.95。 6. The collimating cylindrical lens according to claim 1, wherein: The height of the second fixed frame is h3, the width of the inner wall of the second fixed frame is w3, the curvature radius of the image side of the second lens is R4, and the collimating cylindrical lens satisfies: 1.21 <h3×R4 / (-1×w3)<2.95。 7. The collimating cylindrical lens according to claim 1, wherein: The height of the concave step on the image side of the spacer frame is h2", the width of the inner wall of the spacer frame is w2, the radius of curvature of the object side of the second lens is R3, and the collimating cylindrical lens meets the following requirements: 1.61 <h2"×R3 / w2<2.99。 8. The collimating cylindrical lens according to claim 1, wherein: The height of the concave step on the object side of the spacer frame is h2', the inner wall width of the spacer frame is w2, the curvature radius of the image side of the first lens is R2, and the collimating cylindrical lens meets the following requirements: 4.21 <h2'×R2 / w2<30.95。 9. The collimating cylindrical lens according to claim 1, wherein: The distance between the side of the first fixed image frame and the side of the spacer image frame is EP12, the center thickness of the first lens on the optical axis is CT1, the center thickness of the second lens on the optical axis is CT2, and the collimating cylindrical lens meets the following requirements: 1.25 <EP12 / (CT1+CT2)<1.87。 10. The collimating cylindrical lens according to claim 1, wherein: An axial distance from the object side surface of the first lens to the image side surface of the second lens is TD, a maximum height of the collimating cylindrical lens is H, a sum of the center thicknesses of the first lens and the second lens is ∑CT, a sum of the heights of the first fixing frame, the second fixing frame, and the spacer frame is ∑h, and the collimating cylindrical lens satisfies the following: 0.8<(TD / ∑CT)×(∑h / H)<1.7.

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