Line spot lens

Abstract

The utility model provides a linear light spot lens, which comprises a lens barrel with a cavity, the lens barrel comprises a central axis, and a first space ring, a convex lens, a first concave cylindrical lens, a second space ring, a second concave cylindrical lens, a third space ring, a convex cylindrical lens and a window lens are arranged in the cavity of the lens barrel and are sequentially and coaxially arranged along the light direction; the optical axis of the first concave cylindrical lens is parallel to the optical axis of the convex cylindrical lens and perpendicular to the optical axis of the second concave cylindrical lens. The linear light spot lens can be used for high-power laser, realizes linear light spots with longer working distance and longer length, and meets application scenes with requirements on the length and the width of the light spots.

Description

Technical Field

[0001] This utility model relates to the field of optical system technology, and in particular to a line spot lens. Background Technology

[0002] In certain applications, high-power lasers are required and there are requirements for the length and width of the laser spot. For example, in material processing, a large-area laser spot can improve the efficiency of material processing for materials with large areas.

[0003] Existing optical systems suffer from limitations in application to high-power lasers, small spot size, and high manufacturing difficulty and cost. For example, the transmissive cylindrical optical system in patent document CN 221993699 U only focuses in one direction, leaving the other direction unrestricted, thus failing to define the spot length. Patent document CN119575681 A, with its small depth of focus and long working distance, features a short working distance and a small spot size, limiting its application scenarios. CN 118625534 A describes optical components and related optical equipment involving the application of cylindrical mirror arrays for linear spot shaping. Current manufacturing processes for cylindrical mirror arrays primarily include: 1) arranging multiple single cylindrical mirrors and bonding them with adhesive; however, in high-power laser applications, the adhesive absorbs heat, potentially causing the mirrors to burn out; 2) molding the cylindrical array, which is difficult to polish and coat between the two cylinders, or may contain dead zones, resulting in significant energy loss, making it unsuitable for high-power laser applications. Existing technologies also use Powell prisms, but the Powell prisms available on the market are small in size and expensive, which cannot meet the requirements of large-aperture laser beam applications.

[0004] Therefore, improved optical systems are needed to suit high-power laser applications and reduce processing difficulty and cost. Utility Model Content

[0005] This invention provides a line spot lens that can be used with high-power lasers to achieve a longer working distance and a longer line spot, meeting the requirements of application scenarios with requirements for the length and width of the spot.

[0006] The technical solution of this utility model is as follows:

[0007] This utility model provides a linear light spot lens, comprising: a lens barrel with a cavity, the lens barrel including a central axis, wherein a first spacer, a convex lens, a first concave cylindrical lens, a second spacer, a second concave cylindrical lens, a third spacer, a convex cylindrical lens and a window lens are disposed in the cavity of the lens barrel and arranged coaxially in sequence along the light direction; the optical axis of the first concave cylindrical lens is parallel to the optical axis of the convex cylindrical lens and perpendicular to the optical axis of the second concave cylindrical lens.

[0008] Optionally, a convex lens is mounted inside the lens barrel via a first lens mount and fixed by a first pressure ring; a first concave cylindrical lens is mounted inside the lens barrel via a second lens mount and pressed by a second spacer; a second concave cylindrical lens is mounted inside the lens barrel via a third lens mount and pressed by a third spacer; a convex cylindrical lens is mounted inside the lens barrel via a fourth lens mount and fixed by a pressing block; and the second pressure ring is configured to abut against the fourth lens mount and press the fourth lens mount.

[0009] Optionally, the window mirror is installed inside a window mirror drawer, which can be slidably removed from the mirror tube.

[0010] Optionally, the lens barrel includes a first air passage and a second air passage, both of which include an air inlet and an air outlet. The air inlet is located on the outer side of the lens barrel at the front end of the window mirror, and the air outlet is located at the front end of the lens barrel.

[0011] Optionally, the scope barrel also includes a window, which is configured as a through-hole located at the front end of the scope barrel.

[0012] Optionally, the air vents are located on opposite sides of the window, and the air vents are slit-shaped.

[0013] Optionally, the first mirror mount, the second mirror mount, the third mirror mount, the fourth mirror mount, the first spacer, the second spacer, and the third spacer are provided with limiting grooves; the inner wall of the cavity of the mirror tube is provided with a limiting platform that cooperates with the limiting grooves.

[0014] Alternatively, the convex lens may include one of a plano-convex lens, a biconvex lens, or a positive meniscus lens.

[0015] Optionally, the first concave cylindrical lens and the second concave cylindrical lens include one of a plano-concave cylindrical lens, a biconcave cylindrical lens, or a negative meniscus cylindrical lens.

[0016] Optionally, the convex cylindrical lens includes one of a plano-convex cylindrical lens, a biconvex cylindrical lens, or a positive meniscus lens.

[0017] The beneficial effects produced by the technical solution of this utility model are as follows:

[0018] This invention utilizes a combination of convex and cylindrical lenses to achieve a long working distance and a long beam length, exceeding 500mm. Cylindrical lenses are used in both the X and Y directions, focusing in one direction and diverging in the other. By changing the lens spacing and curvature, the beam size can be altered to meet the requirements of applications with specific beam length and width dimensions. For example, in material processing, a large beam size can improve processing efficiency for large-area materials. This invention also addresses the limitation of existing technologies in high-power laser (kilowatt-level and above) applications by adding a water-cooling channel. Furthermore, a transverse air curtain is designed at the lens front to effectively isolate contaminants generated during processing, preventing them from adhering to the window and causing lens damage. This invention, through the combination of spherical and concave / convex cylindrical lenses, allows for the use of conventional lenses, resulting in lower lens processing difficulty, simple lens assembly and adjustment, high yield, and low cost. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1A This is a cross-sectional view of the line spot lens of this utility model taken along the Z-axis direction plane BB.

[0021] Figure 1B This is a schematic diagram of the optical axis of a cylindrical lens;

[0022] Figure 2A This is a cross-sectional view of the line spot lens of this utility model taken from a plane AA orthogonal to its Z-axis plane BB.

[0023] Figure 2B This is a schematic diagram showing the air inlet and air outlet of the line spot lens of this utility model;

[0024] Figure 3 This is a schematic diagram of the external lens barrel of the line spot lens of this utility model;

[0025] Figure 4 This is a schematic diagram of the limiting groove of the cylindrical lens mount of the line spot lens of this utility model;

[0026] Figure 5 This is a schematic diagram of the limiting stage inside the lens barrel of the linear spot lens of this utility model.

[0027] Figure 6 This is a schematic diagram of the focusing optical path of the line spot lens of this utility model;

[0028] Figure 7 This is a schematic diagram of the diverging optical path of the linear spot lens of this utility model.

[0029] Reference numerals: 1-lens; 2-first spacer; 3-first lens mount; 4-convex lens; 5-first pressure ring; 6-second lens mount; 7-first concave cylindrical lens; 8-second spacer; 9-third lens mount; 10-second concave cylindrical lens; 11-third spacer; 12-fourth lens mount; 13-convex cylindrical lens; 14-first clamping block; 15-second clamping block; 16-window mirror drawer; 17-window mirror; 18-second pressure ring; 19-limiting groove; 20-limiting platform; 21-first air passage; 22-second air passage; 23-air inlet; 24-air outlet; 25-water inlet; 26-water outlet; 30-window. Detailed Implementation

[0030] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention. Rather, they are merely examples of systems consistent with some aspects of this invention as detailed in the appended claims.

[0031] The description of illustrative embodiments based on the principles of this invention is read in conjunction with the accompanying drawings, which are considered an integral part of the entire written description. Any references to directions or orientations in the description of the embodiments of this invention disclosed herein are merely for ease of description and are not intended to limit the scope of the invention in any way. Relative terms such as “downward,” “upward,” “horizontal,” “vertical,” “above,” “below,” “up,” “top,” “bottom,” and their derivatives (e.g., “horizontally,” “downward,” “upward,” etc.) should be interpreted as referring to the orientation as described or shown in the drawings discussed. These relative terms are for ease of description only and do not require the device to be constructed or operated in a particular orientation unless explicitly stated otherwise.

[0032] Terms such as “attachment,” “addition,” “connection,” “coupling,” and “interconnection” refer to relationships in which structures are directly or indirectly fixed or attached to each other through an intermediate structure, and where both are movable or rigidly attached or related unless otherwise expressly stated. Furthermore, the features and benefits of this invention are illustrated with reference to exemplary embodiments. Therefore, this invention should not be explicitly limited to such exemplary embodiments, which illustrate some possible non-limiting combinations of features that may exist alone or in combination with other features; the scope of this invention is defined by the appended claims.

[0033] like Figure 1A and Figure 2A As shown, the linear light spot lens of this invention includes a lens barrel 1, which includes a cavity and a central axis. The lens is disposed within the cavity of the lens barrel 1 and along the direction of the light rays (e.g., ...). Figure 1A As shown in the diagram, the first spacer 2, convex lens 4, first concave cylindrical lens 7, second spacer 8, second concave cylindrical lens 10, third spacer 11, convex cylindrical lens 13, and window mirror 17 are arranged coaxially from left to right. Figure 1B As shown, the optical axis of a cylindrical lens is defined as the direction with zero curvature. Figure 1B The image shows a convex cylindrical lens. Similarly, for a concave cylindrical lens, the optical axis is in the direction of zero curvature.

[0034] See Figure 1A and Figure 2A The optical axis of the first concave cylindrical lens 7, installed in the lens barrel 1, is set to be parallel to the optical axis of the convex cylindrical lens 13 and perpendicular to the optical axis of the second concave cylindrical lens 10. In other words, the optical axis of the first concave cylindrical lens 7 is oriented to be parallel to the optical axis of the convex cylindrical lens 13 and orthogonal to the optical axis of the second concave cylindrical lens 10.

[0035] like Figure 1A As shown, the convex lens 4 is mounted inside the lens barrel 1 via the first lens mount 3 and fixed by the first pressure ring 5; the first concave cylindrical lens 7 is mounted inside the lens barrel 1 via the second lens mount 6 and pressed by the second spacer 8; the second concave cylindrical lens 10 is mounted inside the lens barrel 1 via the third lens mount 9 and pressed by the third spacer 11; the convex cylindrical lens 13 is mounted inside the lens barrel 1 via the fourth lens mount 12 and fixed by the first pressing block 14 and the second pressing block 15; the second pressure ring 18 is configured to abut against the fourth lens mount 12 and press the fourth lens mount 12; the window mirror 17 is located on the right side adjacent to the second pressure ring 18, and is installed inside the window mirror drawer 16. The edge of the window mirror 17 is fixed by screws, and the window mirror drawer 16 can be slidably pulled out of the lens barrel 1 to facilitate the installation and replacement of the window mirror 17. The window mirror 17 faces the window 30, which is a rectangular through hole at the right end of the lens barrel 1 for light from the window mirror 17 to pass through.

[0036] like Figure 1A and Figure 3 As shown, the lens barrel 1 includes a first air path 21 and a second air path 22. The lens barrel 1 is equipped with an optical fiber interface (not shown, approximately located at...). Figure 1A The left side of the middle tube 1 is used to connect to the QBH adapter, which in turn connects to the QBH connector. Both the adapter and the connector are common standard components available on the market. The first air passage 21 and the second air passage 22 each include two air inlets 23 and one air outlet 24. For example... Figure 3 As shown, the air inlet 23 is located on the outer side of the mirror tube 1 near the front end of the window mirror 17, and the air outlet 24 is located on opposite sides of the rectangular window 30, as shown. Figure 3 The diagram shows a slit-type design. An air inlet 23 is fitted with an air pipe interface, through which compressed gas is input. The gas passes through the air passages inside the lens barrel 1 and is then ejected from the air outlets 24 on both sides of the window 30, forming an air curtain in front of the window mirror 17 to protect it from contamination. The air passages between the air inlet 23 and the air outlets 24 are completely open inside the lens barrel 1, while the air outlets 24 are slit-shaped (e.g.,...). Figure 2B (As shown). Setting a horizontal air curtain at the front of the lens can effectively isolate contaminants generated during processing, preventing contaminants from adhering to the window film and causing lens damage and contamination.

[0037] See Figure 3 According to one embodiment of this application, the lens barrel 1 further includes a water channel, which includes a water inlet 25, an internal water channel, and a water outlet 26. The water inlet 25 and the water outlet 26 are located outside the lens barrel 1 and are in fluid communication with the internal water channel. Each of the water inlet 25 and the water outlet 26 is equipped with a water pipe interface, which is connected to a water pipe, and cooling water is connected through the water pipe. During operation, the lens temperature is reduced by circulating cooling water. By adding a water cooling channel, the problem that the prior art cannot be applied in high-power laser (kilowatt level and above) application scenarios is solved.

[0038] The internal lens elements of the line spot lens are all individually fixed in the lens mount, and the specific installation method is as follows:

[0039] A convex lens 4 is mounted on a first lens mount 3 and secured by a first pressure ring 5. The first lens mount 3 with the convex lens 4 is then installed in the lens barrel 1. A first concave cylindrical lens 7 is mounted on a second lens mount 6 and pre-fixed with adhesive before being pressed by a second spacer 8. A second concave cylindrical lens 10 is mounted on a third lens mount 9 and pre-fixed with adhesive before being pressed by a third spacer 11. A convex cylindrical lens 13 is mounted on a fourth lens mount 12 and secured by a first pressing block 14 and a second pressing block 15. The first pressing block 14 and the second pressing block 15 have threaded holes, and screws are used to fix the first pressing block 14, the second pressing block 15, and the fourth lens mount 12.

[0040] The first mirror mount 3, the second mirror mount 6, the third mirror mount 9, and the fourth mirror mount 12 are installed after the mirror tube 1 and are pressed tightly by the second pressure ring 18.

[0041] like Figure 4 and Figure 5 As shown, the cylindrical lens mounts (i.e., the first lens mount 3, the second lens mount 6, the third lens mount 9 and the fourth lens mount 12) and the spacers (the first spacer 2, the second spacer 8 and the third spacer 11) are provided with limiting grooves 19; the inner wall of the cavity of the lens barrel 1 is provided with a limiting platform 20 that cooperates with the limiting grooves 19. During installation, the limiting grooves 19 and the limiting platforms 20 correspond to each other to ensure the accuracy of the cylindrical lens installation direction.

[0042] In a preferred embodiment, the convex lens 4 includes one of a plano-convex lens, a biconvex lens, or a positive meniscus lens (the curvature of the convex surface is greater than that of the concave surface); the concave cylindrical lens (the first concave cylindrical lens 7 and the second concave cylindrical lens 10) includes one of a plano-concave cylindrical lens, a biconcave cylindrical lens, or a negative meniscus lens (the curvature of the concave surface is greater than that of the convex surface); and the convex cylindrical lens 13 includes one of a plano-convex cylindrical lens, a biconvex cylindrical lens, or a positive meniscus lens (the curvature of the convex surface is greater than that of the concave surface).

[0043] The convex lens 4, the first concave cylindrical lens 7, the second concave cylindrical lens 10, the convex cylindrical lens 13, and the window mirror 17 are made of BK7 / K9 glass or fused silica; preferably, in high-power laser applications, the above lenses are made of fused silica.

[0044] In a preferred embodiment, the radius of curvature of the convex lens 4 is 45.80 mm; the radius of curvature of the first concave cylindrical lens 7 is -45.85 mm; the radius of curvature of the second concave cylindrical lens 10 is -23.3 mm; and the radius of curvature of the convex cylindrical lens 13 is 34.4 mm.

[0045] The distance between the plane of the convex lens 4 and the plane of the first concave cylindrical lens 7 is 11 mm; the distance between the plane of the first concave cylindrical lens 7 and the plane of the second concave cylindrical lens 10 is 24 mm; and the distance between the plane of the second concave cylindrical lens 10 and the plane of the convex cylindrical lens 13 is 16 mm.

[0046] The optical path of the linear spot lens of this invention can be divided into two directions: the focusing optical path direction ( Figure 6 The optical axes of the first concave cylindrical lens 7 and the convex cylindrical lens 13 are perpendicular to the paper plane, and the diverging light path direction is ( Figure 7(The optical axis of the second concave cylindrical lens 10 is perpendicular to the plane of the paper). The curvature surfaces of the first concave cylindrical lens 7 and the convex cylindrical lens 13 are located in the focusing optical path, while the curvature surface of the second concave cylindrical lens 10 is located in the diverging optical path. In the focusing optical path, the laser output from the optical fiber first converges through the convex lens 4, then diverges through the first concave cylindrical lens 7, and finally focuses through the convex cylindrical lens 13. In the diverging optical path, the laser output from the optical fiber first converges through the convex lens 4, then diverges through the second concave cylindrical lens 10. The focusing and diverging directions of the line spot lens are orthogonal; one direction focuses, and the other diverges, to form a narrow line spot.

[0047] This invention combines a convex mirror with concave and convex cylindrical lenses to form a linear light spot, which reduces aberrations and improves the uniformity of the light spot. A single spherical mirror is used in both the focusing and diverging directions, reducing the number of lenses. In practice, conventional lenses can be used, which are easy to manufacture, simplify lens assembly and adjustment, and result in high yield and low cost. Furthermore, the convex mirror only converges the beam, not collimates it, allowing for a farther focal point, a finer light spot, and a more compact lens structure.

[0048] This utility model of a linear spot lens can form a linear spot with a relatively long working distance and a relatively long length, wherein the working distance is greater than 500mm and the spot length is greater than 500mm; and cylindrical lenses are used in the X and Y directions (two orthogonal directions), converging in one direction and diverging in the other. By changing the lens spacing and lens curvature, the spot size can be changed to meet the application scenarios with requirements for the length and width of the spot. For example, in material processing, for materials with a large area, a large linear spot can improve the efficiency of material processing.

[0049] The above-described embodiments are merely specific implementations of this utility model, used to illustrate the technical solutions of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model. These modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A line spot lens characterized by, include: A lens barrel with a cavity includes a central axis, wherein a first spacer, a convex lens, a first concave cylindrical lens, a second spacer, a second concave cylindrical lens, a third spacer, a convex cylindrical lens, and a window mirror are disposed within the cavity of the lens barrel and arranged coaxially in sequence along the light direction; the optical axis of the first concave cylindrical lens is parallel to the optical axis of the convex cylindrical lens and perpendicular to the optical axis of the second concave cylindrical lens.

2. The line spot lens according to claim 1, characterized in that The convex lens is mounted inside the lens barrel via a first lens mount and is fixed by a first pressure ring; the first concave cylindrical lens is mounted inside the lens barrel via a second lens mount and is pressed by a second spacer; the second concave cylindrical lens is mounted inside the lens barrel via a third lens mount and is pressed by a third spacer; the convex cylindrical lens is mounted inside the lens barrel via a fourth lens mount and is fixed by a clamping block; the second pressure ring is configured to abut against the fourth lens mount and press the fourth lens mount tightly.

3. The line spot lens according to claim 1, characterized in that The window mirror is installed inside a window mirror drawer, which can be slidably removed from the mirror tube.

4. The line spot lens according to claim 1, characterized in that The lens barrel includes a first air passage and a second air passage. Both the first air passage and the second air passage include an air inlet and an air outlet. The air inlet is located on the outer side of the lens barrel at the front end of the window mirror, and the air outlet is located at the front end of the lens barrel.

5. The line spot lens according to claim 4, characterized in that The lens barrel also includes a window, which is configured as a through hole located at the front end of the lens barrel.

6. The line spot lens according to claim 5, characterized in that The air outlets are located on opposite sides of the window, and the air outlets are slit-shaped.

7. The line spot lens according to claim 2, characterized in that The first mirror mount, the second mirror mount, the third mirror mount, the fourth mirror mount, the first spacer, the second spacer, and the third spacer are provided with limiting grooves; the inner wall of the cavity of the mirror tube is provided with a limiting platform that cooperates with the limiting grooves.

8. The line spot lens according to claim 1, characterized in that The convex lens includes one of a plano-convex lens, a biconvex lens, or a positive meniscus lens.

9. The line spot lens according to claim 1, characterized in that; The first concave cylindrical lens and the second concave cylindrical lens include one of a plano-concave cylindrical lens, a biconcave cylindrical lens, or a negative meniscus cylindrical lens.

10. The line spot lens according to claim 1, characterized in that; The convex cylindrical lens includes one of a plano-convex cylindrical lens, a biconvex cylindrical lens, or a positive meniscus lens.

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