Multi-degree-of-freedom adjusting device for oblique lens

Abstract

The utility model relates to a slant lens multi-degree-of-freedom adjusting device, which comprises a lens mounting seat, a lens fixing seat and a lens fixing seat, the lens fixing seat is provided with an inclined surface and is fixedly connected with the lens mounting seat; the lens is mounted on the inclined surface of the lens mounting seat; the fastening adjusting mechanism is mounted on the lens mounting seat and can move in the direction perpendicular to the inclined surface of the lens mounting seat; and the cam adjusting mechanism is mounted on the lens fixing seat and can rotate. The set adjusting mechanism and the cam adjusting mechanism are arranged to be matched with each other so that multi-degree-of-freedom adjustment of the oblique lens can be achieved, adjustment operation is simple, and the adjusting device is simple in overall structure and small in occupied space.

Description

Technical Field

[0001] The utility model relates to the technical field of optical instrument adjustment, in particular to a multi-degree-of-freedom adjustment device for an oblique lens. Background Art

[0002] During the assembly and use of optical instruments, the optical path needs to be adjusted, which often involves adjusting the position and angle of various lenses in the optical path. In existing technology, lenses are typically secured with UV adhesive, which requires fine-tuning using a transmission structure or multiple adjustment platforms. However, UV adhesive is difficult to secure with larger lenses.

[0003] Chinese utility model patent CN219675428U discloses a defect detection device for photoelectric optical lenses. Through the mutual cooperation between the protective cover, electric telescopic rod, connecting plate, rack, drive gear and rotating shaft, the lens can be adjusted to an angle with the front lower and the back higher or the front higher and the back lower. However, the overall structure is relatively complex, occupies a large space, and can only achieve one degree of freedom of angle adjustment. In addition, the lens is placed in the inner cavity of the fixed seat and is fixed only by the arc-shaped positioning plates on both sides. It is only suitable for small lenses. When the detection equipment uses a large lens, the weight of the lens becomes larger, and the support only by the positioning plates on both sides will make the fixation unstable, and there is a risk of moving up and down and falling off. This structure cannot be used when the lens size is too large or the lens is not placed horizontally.

[0004] Chinese utility model patent CN216817060U discloses a three-dimensional lens adjustment device, comprising: a base, a first adjustment platform, a second adjustment platform, and a lens holder. The first adjustment platform is located on the side of the base and can slide horizontally relative to the base; the second adjustment platform is located on the first adjustment platform and can rotate relative to the first adjustment platform; the lens holder is located on the second adjustment platform and can rotate relative to the second adjustment platform. The rotation plane of the lens holder is perpendicular to the rotation plane of the second adjustment platform, and the lens is fixed to the lens holder with UV glue. The three-dimensional lens adjustment device is realized by using the first adjustment platform, the second adjustment platform, and the lens holder, but the structure is too redundant, occupies a large space, and is complex to adjust. It is difficult to apply to optical machine structures in practice, and it does not take into account the problem of non-horizontal placement of the lens or the inconvenience of fixing the lens that is too large.

[0005] Therefore, a device for fixing and adjusting with multiple degrees of freedom that occupies a small space and is easy to adjust is needed for large-sized oblique lenses. Utility Model Content

[0006] In order to solve at least some of the above problems in the prior art, the present invention provides a multi-degree-of-freedom adjustment device for an oblique lens, comprising:

[0007] a lens mount having an inclined surface;

[0008] a lens fixing seat, which has an inclined surface and is fixedly connected to the lens mounting seat;

[0009] a lens mounted on the inclined surface of the lens mounting seat;

[0010] a tightening adjustment mechanism, which is mounted on the lens mounting seat and is capable of moving in a direction perpendicular to the inclined surface of the lens mounting seat;

[0011] The cam adjustment mechanism is mounted on the lens fixing seat and is capable of rotating.

[0012] Furthermore, the inclined surface of the lens mounting seat is sunken relative to the inclined surface of the lens fixing seat to form a sunken groove, and the depth of the sunken groove is less than the thickness of the lens.

[0013] Furthermore, the lower end of the inclined surface of the lens mounting seat has a protrusion.

[0014] Furthermore, the tightening and adjusting mechanism includes:

[0015] a fixed bushing fixed on the inclined surface of the lens mounting seat;

[0016] a ball-head set screw, which is installed in the fixing bushing from bottom to top, and the ball head of the ball-head set screw contacts the lower surface of the lens;

[0017] A flat-end set screw is installed on the side of the lens mounting seat and can support the fixing bushing from the side.

[0018] Furthermore, the cam adjustment mechanism includes:

[0019] a camshaft having an adjustment hole for rotationally driven by an adjustment tool, wherein the adjustment hole is located at an end of the camshaft away from the cam;

[0020] a cam, which is sleeved on the cam shaft and contacts the lower surface of the lens;

[0021] A cam fixing screw is installed at the end of the cam shaft to fasten the cam shaft to the cam.

[0022] Furthermore, the cam shaft is sunk into the lens mounting seat and penetrates into the recess of the lens mounting seat through the mounting through hole. The cam is partially submerged in the recess and partially exposed to contact the lower surface of the lens. The end of the cam shaft away from the cam protrudes from the side of the lens mounting seat.

[0023] Furthermore, it also includes a fixing block, which is fixedly connected to the lens fixing seat, and the fixing block is used to press the end of the cam shaft away from the cam; the fixing block has a through hole to expose the adjustment hole of the cam shaft.

[0024] Furthermore, the portion of the camshaft on which the cam is mounted is a square shaft; and

[0025] The cam has a square hole in its center.

[0026] Furthermore, it also includes a lens fixing assembly, which is arranged on the inclined surface of the lens fixing seat and is used to fasten the lens.

[0027] Furthermore, the lens fixing assembly includes a gasket and a bolt, wherein the bolt fixes the gasket, and the gasket presses the lens.

[0028] The present invention has at least the following beneficial effects: (1) The arrangement of a tightening adjustment mechanism and a cam adjustment mechanism in cooperation with each other can realize multi-degree-of-freedom adjustment of the oblique lens, and the adjustment operation is simple; (2) The overall structure of the adjustment device of the present invention is relatively simple and occupies less space; (3) Compared with the use of UV glue, the adjustment device of the present invention uses gaskets and bolts to fix large-sized oblique lenses more firmly. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] To further illustrate the above and other advantages and features of various embodiments of the present invention, a more detailed description of various embodiments of the present invention will be presented with reference to the accompanying drawings. It will be understood that these drawings depict only typical embodiments of the present invention and are not to be considered as limiting the scope thereof. In the drawings, for clarity, identical or corresponding components will be represented by the same or similar reference numerals.

[0030] Figure 1 A stereoscopic diagram of a multi-degree-of-freedom adjustment device for an oblique lens according to an embodiment of the present utility model is shown.

[0031] Figure 2 A front view of a multi-degree-of-freedom adjustment device for an oblique lens according to an embodiment of the utility model is shown.

[0032] Figure 3 A schematic diagram of a multi-degree-of-freedom adjustment device for an oblique lens without a lens installed according to an embodiment of the present invention is shown.

[0033] Figure 4 and 5 Schematic diagrams showing the tightening adjustment mechanism at different angles according to an embodiment of the present invention are shown.

[0034] Figure 6 and 7Schematic diagrams showing different angles of the assembled tightening adjustment mechanism and the cam adjustment mechanism according to one embodiment of the utility model are shown.

[0035] Figures 8 to 10 Schematic diagrams showing cam adjustment mechanisms at different angles according to an embodiment of the present invention are shown. DETAILED DESCRIPTION

[0036] It should be noted that components in the drawings may be shown exaggerated for illustrative purposes and are not necessarily true to scale.

[0037] In the present invention, each embodiment is only intended to illustrate the solution of the present invention and should not be understood as limiting.

[0038] In the present invention, unless otherwise specified, the quantifiers "a" and "an" do not exclude the presence of multiple elements.

[0039] It should also be pointed out that in the embodiments of the present invention, for the sake of clarity and simplicity, only a portion of the parts or components may be shown, but a person skilled in the art will understand that under the guidance of the present invention, the required parts or components may be added according to the needs of the specific scenario.

[0040] It should also be pointed out that within the scope of the present invention, the terms "same", "equal", "equal to" and so on do not mean that the two values ​​are absolutely equal, but allow a certain reasonable error, that is, the terms also cover "substantially the same", "substantially equal", "substantially equal to".

[0041] It should also be noted that in the description of this utility model, the terms "center," "longitudinal," "transverse," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not explicitly or implicitly state that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In addition, the embodiments of the present invention describe the process steps in a specific order, but this is only for the convenience of distinguishing the steps, and does not limit the order of the steps. In different embodiments of the present invention, the order of the steps can be adjusted according to the adjustment of the process.

[0043] In the present invention, the term upper portion refers to a specific structure in which the distance from the bottom is greater than the distance from the top, and the term lower portion refers to a specific structure in which the distance from the bottom is less than the distance from the top.

[0044] Figure 1 A stereoscopic diagram of a multi-degree-of-freedom adjustment device for an oblique lens according to an embodiment of the present utility model is shown. Figure 2 A front view of a multi-degree-of-freedom adjustment device for an oblique lens according to an embodiment of the utility model is shown. Figure 3 A schematic diagram of a multi-degree-of-freedom adjustment device for an oblique lens without a lens installed according to an embodiment of the present invention is shown.

[0045] For large-sized lenses, such as 220mm*220mm*3mm lenses, the assembly and adjustment are more complicated than those of ordinary small lenses. It is difficult to attach them with UV glue. At the same time, it is also necessary to consider multi-directional fine-tuning to ensure the accuracy of the optical path. Therefore, the following is designed: Figure 1 The shown fixing and adjustment device is suitable for large-size lenses.

[0046] like Figure 1 and 3 As shown, a multi-degree-of-freedom adjustment device for an oblique lens includes a lens 1, a lens fixing seat 2, a lens mounting seat 3, a fixing block 5, a cam adjustment mechanism 6, and a tightening adjustment mechanism 7.

[0047] The lens holder 2 and the lens mount 3 are fixedly connected, for example, by bolts. The lens holder 2 and the lens mount 3 have inclined surfaces. In one embodiment of the present invention, the lens holder 2 and the lens mount 3 are both triangular. The lens 1 is fixed to the inclined edge of the lens mount 3, and the two sets of lens holders 2 and lens mounts 3 fix the two sides of the lens 1. The lens holder 2 and the lens mount 3 can be, for example, right triangles. If the inclined surfaces of the lens holder 2 and the lens mount 3 are both 45°, the placement angle of the lens 1 is 45°. This is only an example, and the actual inclination can be any angle.

[0048] The lower surfaces of lens holder 2 and lens mounting seat 3 overlap and are placed parallel to each other. The inclined surface of lens mounting seat 3 is sunken a certain depth below the inclined surface of mounting seat 2, forming a recessed groove. The edge of the lens is placed in the recessed groove. The depth of the recessed groove is slightly less than the thickness of lens 1. When lens 1 is placed on mounting seat 3, the upper surface of lens 1 is slightly higher than the inclined surface of lens holder 2. The lower end of the inclined surface of lens mounting seat 3 has a bump to prevent lens 1 from sliding off.

[0049] In addition to the recessed groove in the lower mounting base 3, lens 1 is also secured on both sides by lens fixing assemblies. These assemblies include nylon washers 4 and bolts securing them. Nylon washers 4 are bolted to the inclined surface of lens mounting base 2. Because the upper surface of lens 1 is higher than that of lens mounting base 2, the nylon washers 4 act elastically against the upper surface of the lens, compressing it and securing it. This method is easy to operate and has a simple structure. The central portion of the lens is suspended in the air, preventing it from obstructing the light path. It also accommodates various lens sizes and mounting angles.

[0050] In order to facilitate the adjustment of the overall structure after installation, adjustment windows are processed on the lens mounting seat 3 and the lens fixing seat 2 to facilitate the adjustment tool to enter the inner side of the adjustment device to adjust the set screw. The adjustment window can be triangular.

[0051] The cam adjustment mechanism 6 adjusts the lower half of the lens. The tightening adjustment mechanism 7 is arranged on the upper half of the inclined surface of the lens mounting seat 3 to adjust the upper half of the lens.

[0052] The tightening adjustment mechanism can move perpendicular to the inclined surface of the lens mount to adjust the height of the lens. The cam adjustment mechanism can rotate to adjust the height of the lens. The cam adjustment mechanism 6 and the tightening adjustment mechanism 7 cooperate with each other to adjust the height and rotation angle of the lens.

[0053] Figure 4 and 5 Schematic diagrams showing the tightening adjustment mechanism at different angles according to an embodiment of the present invention are shown. Figure 6 and 7 Schematic diagrams showing different angles of the assembled tightening adjustment mechanism and the cam adjustment mechanism according to one embodiment of the utility model are shown.

[0054] like Figures 4 to 7 As shown, the tightening adjustment mechanism 7 includes a ball head tightening screw 701, a fixing bushing 702 and a flat end tightening screw 703. The tightening adjustment mechanism 7 is installed on the upper part of the inclined surface of the lens mounting seat 3. The tightening adjustment mechanism 7 is used to adjust the height of the upper part of the lens.

[0055] The inclined surface of the lens mount 3 has a mounting hole (not shown), into which a fixed bushing 702 is assembled. The fixed bushing 702 has a certain degree of elasticity and is mostly a transition fit with the lens mount 3. The fixed bushing 702 is perpendicular to the inclined surface of the lens mount 3. The fixed bushing 702 can elastically cover a ball-end set screw 701. The ball-end set screw 701 is installed in the fixed bushing 702, and the ball head of the ball-end set screw 701 protrudes from the inclined surface of the lens mount 3. When the ball-end set screw 701 is tightened, the ball head will move in the direction protruding from the inclined surface of the lens mount 3, lifting the lens. This movement direction is defined as upward, and the opposite direction is downward. When the screw is loosened, the ball head will move downward. The side of the lens mount 3 has a threaded hole, and the flat-end set screw 703 is installed in the threaded hole, which can support the fixed bushing 702 from the side to fix it. When adjustment is required, loosen the flat end set screw 703 to facilitate adjustment of the ball head set screw 701. After the adjustment is completed, tighten the flat end set screw 703. The flat end will support the fixed bushing 702 to prevent the bushing from moving under the action of the ball head set screw, and better tighten the point to avoid the risk of loosening under vibration conditions.

[0056] In the tightening adjustment structure 7, the ball head tightening screw is the one that directly adjusts and affects the orientation of the lens. The point contact between the ball head and the lower surface of the lens makes the adjustment more precise. The fixed bushing 702 tightly wraps the ball head tightening screw 701. In order to prevent the ball head tightening screw from moving under various external factors such as the lens's own weight pressure and alternating stress, it is necessary to press the bushing from the side with the flat end tightening screw so that the bushing does not move. The fixed bushing 702 is mostly made of elastic material, so it is reasonable and necessary to press the flat end tightening screw 703 against the fixed bushing 702. The flat end tightening screw 703 is used to prevent the fixed bushing 702 from moving, and the contact area between the flat end and the outer surface of the bushing is larger. Therefore, the fixed bushing 702 uses a flat end tightening screw 703 instead of a ball head tightening screw.

[0057] Figures 8 to 10 Schematic diagrams showing cam adjustment mechanisms at different angles according to an embodiment of the present invention are shown.

[0058] like Figures 8 to 10 As shown, the cam adjustment mechanism 6 includes a cam 601, a cam fixing screw 602, and a cam shaft 603. The cam 601 is fixedly connected to the cam shaft 603. The cam 601 is divided into three sections. The first section is a square shaft for connecting to the cam 601, and the second and third sections can be installed in the mounting through-hole of the lens holder 2. The diameter of the second section is smaller than the diameter of the third section. The second section is located between the first and third sections. An adjustment hole is formed at the end of the third section. An adjustment tool is inserted into the adjustment hole to rotate the cam shaft 603 to drive the cam 601 to rotate, thereby adjusting the stroke of the cam 601. The adjustment hole can be, for example, a hexagonal hole. The adjustment tool cooperates with the adjustment hole, for example, it can be an Allen wrench.

[0059] In order to ensure the fastening of cam 601 and camshaft 603, a square hole is opened in the center of cam 601, and a square shaft is milled out on the part of camshaft 603 where the cam is to be installed to match the square hole of cam 601. At the same time, a threaded hole is milled out on the end of camshaft 603 close to cam 601, and camshaft 603 and cam 601 are fastened by cam fixing screw 602.

[0060] like Figure 6 and 7 As shown, the cam adjustment mechanism 6 is mounted below the inclined surface of the lens mount and is used to adjust the height of the lower portion of the lens. The cam shaft 603 is sunken into the lens mount 2 and penetrates through the mounting hole into the recessed groove of the lens mount 3. The cam 601 is mostly submerged in the recessed groove of the lens mount 3, with a portion exposed to contact the lower surface of the lens 1.

[0061] The first section of the camshaft 603 passes through the mounting hole, while the second and third sections are located within the mounting hole. The mounting hole corresponds to the shape and size of the second and third sections, allowing the second end and third section to be sunk into the mounting hole and allowing the camshaft to rotate. The end of the camshaft 603, away from the cam 601, protrudes from the side of the lens holder 2.

[0062] The fixing block 5 has a through hole with a diameter greater than or equal to the camshaft's adjustment hole and smaller than the diameter of the camshaft's third end section. The fixing block 5 is connected to the side of the lens holder 2 via fasteners such as bolts. The fixing block 5 contacts the camshaft's third end section, compressing the camshaft when not in adjustment. Due to the diameter of the lens holder 2's mounting hole, the camshaft's third end is trapped within the mounting hole, effectively clamping the camshaft between the mounting hole and the fixing block to prevent movement. When the camshaft 603 needs to be rotated, the bolts on the fixing block 5 are loosened to remove the fixing block 5 from contact with the camshaft 603, facilitating rotation of the camshaft 603.

[0063] By turning camshaft 603 left or right, the axis's translational freedom is restricted, causing cam 601 to rotate left or right to change the stroke. For example, from the start of the push stroke to the end of the push stroke, the lens adjustment point is raised, and from the start of the return stroke to the end of the return stroke, the lens adjustment point is lowered to achieve fine adjustment.

[0064] The lower surface of the lens 1 is not in contact with the bottom surface of the recessed groove of the lens mounting seat 3. Instead, the lower part of the lens 1 contacts the cam 601 in the two cam adjustment mechanisms 6, and the upper part of the lens contacts the ball head surface of the ball head setting screw 701 in the two tightening adjustment mechanisms 7.

[0065] By tightening the ball head set screw 701, the ball head is lifted up to the corresponding adjustment point of the lens. By loosening the ball head set screw 701, the ball head is lowered, and the lens is lowered and adjusted under the action of gravity.

[0066] Twisting camshaft 603 left or right rotates cam 601 to change travel. Because the radius of cam 601 varies, rotating cam 601 raises and lowers the corresponding lens point. The radius of cam 601 is the distance from the center of the cam to the side. From the start of the push stroke to the end of the push stroke, the lens adjustment point is raised. From the start of the return stroke to the end of the return stroke, the lens adjustment point is lowered for fine-tuning.

[0067] By rotating the cam shaft 603 and the ball head set screw 701 respectively, the four points can be raised and lowered to achieve multi-degree-of-freedom adjustment.

[0068] The method for using the above adjustment device to adjust the lens with multiple degrees of freedom is as follows:

[0069] Here, the direction of the inclined surface of the lens mount 3 is defined as the Y-axis, the line perpendicular to the Y-axis and located on the side surface (triangular surface) of the lens mount 3 is defined as the X-axis, and the line perpendicular to the Y-axis and located on the lens surface is defined as the Y-axis. Those skilled in the art will be familiar with the fact that the above directions can be defined in a variety of ways, not just the X, Y, and Z directions in this example.

[0070] 1) Generally speaking, the translational degrees of freedom of the same lens in the optical path structure will not change. If the lens size needs to be changed, it can be controlled by moving the distance between the lens fixing seat 2 and the lens mounting seat 3 on both sides of the lens. Therefore, the adjustment device has compatibility with multiple sizes.

[0071] 2) If translational adjustment along the Y-axis is required, the lens is secured using the shims in the lens mounting assembly. First, loosen the bolts in the lens mounting assembly, move the lens to the desired position along the Y-axis, then press the shims against the lens and tighten the bolts. However, in most cases, the lower end of the lens rests in a sink, and Y-axis adjustment is uncommon in optical path configurations.

[0072] 3) If you need to adjust the upside-down rotation of the rotational freedom, adjust the two cam adjustment mechanisms or the two tightening adjustment mechanisms to achieve this. Loosen the bolts of the lens fixing assembly before adjustment and tighten them again after adjustment is completed.

[0073] 4) To adjust the fore-aft deflection of the rotational degree of freedom, simply adjust a fixed fine-tuning mechanism and a cam fine-tuning mechanism on the left or right side. This will raise the left or right side of the lens to achieve fore-aft deflection. Loosen the bolts of the lens fixing assembly before adjustment and tighten them after adjustment is complete.

[0074] 5) If adjustment of the left and right deflection (rotational freedom in the XY plane) is required, this adjustment generally has no substantial effect on the optical path and will not affect the angle or orientation of the reflective surface. If adjustment is necessary, loosen the bolts of the lens fixing assembly, rotate the lens fixing base and lens mounting base on both sides of the lens by a certain angle, and then secure the lens with the lens fixing assembly.

[0075] 6) If vertical adjustment of the lens is required, this adjustment generally has no substantial effect on the optical path and will not affect the angle or orientation of the reflective surface. If adjustment is necessary, simply adjust the four fine-tuning mechanisms (up, down, left, and right) to raise or lower the lens in sync. Loosen the bolts securing the lens assembly before adjustment and tighten them after adjustment is complete.

[0076] By adjusting two camshafts and two set screws, the four points can be raised and lowered, thereby achieving multi-degree-of-freedom adjustment. The structure of the utility model adopts a quadrilateral distribution. The adjustment concept of the lens is different from the three-point positioning. It basically uses several fixed adjustment concepts, such as flipping up and down or flipping left and right. As for the translation or rotation parallel to the placement surface, there is no substantial effect. Adjusting two points on the upper and lower sides or the left and right sides can easily achieve adjustment on one side. Therefore, in the description, only two points need to be adjusted. However, there may be some errors in the actual adjustment process. At this time, the third adjustment point can be used as an auxiliary. Based on the principle of three points determining the same plane, the third position is only used for support.

[0077] Compared to traditional fine-tuning mechanisms, this structure allows for direct height adjustment from the side, rather than requiring adjustment in the vertical direction, making adjustment more convenient. Furthermore, the cam parameters can be designed to accommodate a variety of fine-tuning requirements, eliminating the need to worry about accuracy and adjustment amount. The cam parameters shown in the figure are only one specific embodiment. The angle of the bevel, cam form (e.g., linear polynomial cam, quadratic polynomial cam, etc.), and fastener form (e.g., bolts, screws, and gaskets) in this utility model are not limited to the above-described embodiments and can all be replaced with similar types by changing parameters.

[0078] Although certain embodiments of the present invention have been described in this application, those skilled in the art will appreciate that these embodiments are provided for illustrative purposes only. Numerous variations, alternatives, and improvements will be contemplated by those skilled in the art based on the teachings of this invention without departing from the scope of this invention. The appended claims are intended to define the scope of this invention and are intended to encompass methods and structures within the scope of these claims and their equivalents.

Claims

1. A multi-degree-of-freedom adjustment device for an oblique lens, characterized in that: include: a lens mount having an inclined surface; A lens fixing seat, which has an inclined surface and is fixedly connected to the lens mounting seat; A lens mounted on the inclined surface of the lens mounting seat; A tightening adjustment mechanism, which is mounted on the lens mounting seat and can move in a direction perpendicular to the inclined surface of the lens mounting seat; The cam adjustment mechanism is mounted on the lens fixing seat and can rotate.

2. The device according to claim 1, characterized in that The inclined surface of the lens mounting seat is sunken relative to the inclined surface of the lens fixing seat to form a sunken groove, and the sunken depth is less than the thickness of the lens.

3. The device according to claim 2, characterized in that The lower end of the inclined surface of the lens mounting seat is provided with a protrusion.

4. The device according to claim 1, characterized in that The tightening and adjusting mechanism comprises: A fixed bushing fixed on the inclined surface of the lens mounting seat; A ball head set screw is installed in the fixing bushing from bottom to top, and the ball head of the ball head set screw contacts the lower surface of the lens; A flat-end set screw is mounted on the side of the lens mounting seat and can support the fixing bushing from the side.

5. The device according to claim 2, characterized in that The cam adjustment mechanism comprises: A camshaft having an adjustment hole for an adjustment tool to drive the camshaft to rotate, wherein the adjustment hole is located at an end of the camshaft away from the cam; A cam, which is sleeved on the cam shaft, and the cam is in contact with the lower surface of the lens; A cam fixing screw is installed at the end of the cam shaft to fasten the cam shaft to the cam.

6. The device according to claim 5, characterized in that The cam shaft is sunk into the lens mounting seat and penetrates into the recessed groove of the lens mounting seat through the mounting through hole. The cam is partially submerged in the recessed groove and partially exposed to contact the lower surface of the lens. The end of the cam shaft away from the cam protrudes from the side of the lens mounting seat.

7. The device according to claim 6, characterized in that It also includes a fixing block, which is fixedly connected to the lens fixing seat, and the fixing block is used to press the end of the cam shaft away from the cam; the fixing block is provided with a through hole to expose the adjustment hole of the cam shaft.

8. The device according to claim 5, characterized in that The portion of the camshaft on which the cam is mounted is a square shaft; and The cam has a square hole in its center.

9. The device according to claim 1, characterized in that It also includes a lens fixing assembly, which is arranged on the inclined surface of the lens fixing seat and is used for fastening the lens.

10. The device according to claim 9, characterized in that The lens fixing assembly includes a gasket and a bolt, wherein the bolt fixes the gasket, and the gasket presses the lens.

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