Reflection grating spin angle adjustment device and method

Abstract

The present application relates to the technical field of optical devices, in particular to a reflection grating self-rotation angle adjusting device and method, comprising a grating assembly, a grating rotating mechanism and a grating locking mechanism, a reflection grating is arranged in the grating assembly; the rotation angle of the grating assembly around its axis is realized by the grating rotating mechanism, the angle adjusting operation is more rapid, efficient and accurate, the adjusting efficiency and accuracy of the reflection grating are improved, and the actual adjusting requirement is met; meanwhile, the locking of the reflection grating is realized by the grating locking mechanism, the angle change of the reflection grating caused by vibration and other reasons during the test is avoided, and the accuracy and reliability of the adjustment are further ensured.

Description

Technical Field

[0001] This invention relates to the field of optical device technology, and specifically to a device and method for adjusting the spin angle of a reflective grating. Background Technology

[0002] A reflective grating is an extremely important optical element. Its core working principle is based on the diffraction and interference of light. Its surface is engraved with a large number of parallel and equally spaced grooves. When polychromatic light shines on the surface of the grating, light of different wavelengths will be decomposed into monochromatic light that makes it up.

[0003] If the spin angle of the groove on the surface of the grating deviates from the theoretical spin angle during assembly, it will seriously affect the imaging quality. Therefore, the spin angle of the reflective grating needs to be precisely adjusted during assembly. However, the existing adjustment method is cumbersome and has low adjustment efficiency, which cannot meet the actual assembly requirements. Summary of the Invention

[0004] The purpose of this invention is to provide a spin angle adjustment device and method for a reflective grating, thereby solving the technical problem of low adjustment efficiency during the assembly of existing reflective gratings.

[0005] The solution of the present invention to the above-mentioned technical problems is as follows: A spin angle adjustment device for a reflective grating includes a grating assembly, a grating rotation mechanism, and a grating locking mechanism, wherein a reflective grating is disposed in the grating assembly; The output end of the grating rotation mechanism is connected to the grating assembly for driving the reflective grating to rotate around its axis by a preset angle. The output end of the grating locking mechanism is connected to the grating assembly to lock the reflective grating.

[0006] Further defined, the grating assembly includes a grating support, a grating connecting frame, and a grating locking frame; The top of the grating support has a mounting hole, the grating connecting frame is sleeved on the outside of the reflective grating, the grating connecting frame is movably connected to the mounting hole, the mounting hole, the grating connecting frame and the reflective grating are all coaxially arranged, the grating locking frame is set in the mounting hole and contacts the grating connecting frame, and the grating locking frame is located on the outside of the reflective grating. The output end of the grating rotation mechanism is connected to the grating connection frame, and the output end of the grating locking mechanism is connected to the grating locking frame.

[0007] Further, a plurality of adjustment slots are provided on one end face of the grating connecting frame. The plurality of adjustment slots are circumferentially spaced around the axis of the grating connecting frame and are arranged along the radial direction of the grating connecting frame. The output end of the grating rotation mechanism cooperates with the adjustment slots.

[0008] Further specified, a plurality of locking adjustment grooves are provided on one end face of the grating locking frame, the plurality of locking adjustment grooves are circumferentially spaced around the axis of the grating locking frame, the locking adjustment grooves are arranged along the radial direction of the grating locking frame, and the locking adjustment grooves are located outside the circumference of the adjustment snap-fit ​​groove; the grating locking frame is threadedly connected to the mounting hole.

[0009] Further specifying, the grating rotation mechanism includes a rotation drive, a rotation support, and a rotation claw; The connecting end of the rotary drive is connected to the rotary support, and the output end of the rotary drive cooperates with the adjustment slot through the rotary claw. The rotary claw drives the grating connecting frame to rotate through the adjustment slot.

[0010] Further defined, the rotating jaw includes a jaw base and a first jaw corresponding to an adjustment slot. The jaw base has a first adjustment slot, which is arranged in the same direction as the adjustment slot. The first jaw is movably connected to the jaw base through the first adjustment slot.

[0011] Further specifying, the grating locking mechanism includes a locking drive, a locking transmission, a locking claw, and a torque sensor; The locking drive's connecting end is connected to the rotary support, and the locking drive's output end is connected to the locking pawl drive via the locking transmission. The torque sensor is connected between the locking drive's output end and the locking transmission. The locking pawl cooperates with the locking adjustment groove, and the locking pawl drives the grating locking frame to rotate via the locking adjustment groove.

[0012] Further specifying, the locking transmission includes a driving gear, a driven gear, and a bearing; The locking drive's connecting end is connected to the outer side of the rotary support. The driving gear is connected to the output end of the locking drive. The driving gear meshes with the driven gear. The driven gear is rotatably connected to the rotary support through a bearing. The driven gear and the bearing are both coaxially arranged with the grating locking frame. The locking claw is arranged on the end face of the driven gear and is slidably connected to the driven gear in the radial direction. The driven gear has a clearance hole, which is sleeved on the outer side of the rotary claw.

[0013] Furthermore, the bottom of the rotating support is provided with a height adjustment frame, which is movably connected to the rotating support.

[0014] A method for adjusting the spin angle of a reflective grating, based on the aforementioned reflective grating spin angle adjustment device, includes the following steps: The spin angle adjustment device of the reflective grating, the light source, the camera and the whiteboard were all debugged and set on the support base; Adjust the height of the light source so that the height of the light beam is the same as the center height of the reflective grating; Adjust the position and orientation of the light source on the support so that the light is irradiated onto the whiteboard by the diffraction spot after being split by the reflective grating; Adjust the camera's height to capture the diffraction spot; The rotation angle of the reflection grating is determined by the deviation between the collected diffraction spot and the target angle; The grating rotation mechanism drives the reflective grating to rotate around its axis according to the rotation angle of the reflective grating; The grating locking mechanism locks the grating in the grating assembly.

[0015] The beneficial effects of this invention are as follows: 1. This invention utilizes a grating rotation mechanism to achieve the rotation angle of the grating assembly around its axis, enabling faster, more efficient, and more precise angle adjustment operations, improving the adjustment efficiency and accuracy of the reflective grating, and meeting actual adjustment needs; at the same time, a grating locking mechanism is used to lock the reflective grating, preventing changes in the reflective grating angle due to vibration or other reasons during testing, further ensuring the accuracy and reliability of the adjustment.

[0016] 2. This invention provides an adjustment slot on the grating connecting frame and a locking adjustment slot on the grating locking frame. By using a rotating claw to engage with the adjustment slot, the angle of the reflective grating can be adjusted under the action of a rotation drive. After adjustment, the locking drive drives the grating locking frame to rotate through the locking claw, thereby restricting the rotation of the reflective grating connected to the grating connecting frame by squeezing the grating connecting frame. The operation is simple and convenient.

[0017] 3. The locking transmission of this invention utilizes the cooperation of a driving gear, a driven gear, and a bearing, so that the driven gear can drive the grating locking frame to rotate through the locking claw and the locking adjustment groove. At the same time, the driven gear is sleeved on the outside of the rotating claw, which optimizes the layout of the components, reduces the volume, and saves space occupied by the components. Attached Figure Description

[0018] Figure 1 This is a structural diagram of the reflective grating spin angle adjustment device of the present invention; Figure 2 This is a structural diagram of the grating assembly of the present invention; Figure 3 This is a schematic diagram of the back structure of the grating rotation mechanism of the present invention; Figure 4 This is a cross-sectional schematic diagram of the grating locking mechanism of the present invention; Figure 5 This is a diagram showing the spin angle adjustment state of the reflective grating of the present invention. Figure 6 This is a schematic diagram of the optical path for adjusting the spin angle of the reflective grating in this invention.

[0019] In the diagram, 100-grating assembly; 110-reflective grating; 120-grating support; 130-grating connecting frame; 131-adjustment slot; 140-grating locking frame; 141-locking adjustment slot; 200-grating rotation mechanism; 210-rotation drive; 220-rotation support; 221-height adjustment frame; 230-rotating claw; 231-claw base; 232-first claw; 300-grating locking mechanism; 310-locking drive; 320-locking transmission; 321-drive gear; 322-driven gear; 323-bearing; 330-locking claw; 340-torque sensor; 400-light source; 500-camera; 600-whiteboard; 700-support base. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Example 1 refer to Figure 1This invention provides a spin angle adjustment device for a reflective grating, comprising a grating assembly 100, a grating rotation mechanism 200, and a grating locking mechanism 300. The grating assembly 100 contains a reflective grating 110. The output end of the grating rotation mechanism 200 is connected to the grating assembly 100 for driving the reflective grating 110 to rotate around its axis by a preset angle, facilitating angle adjustment of the reflective grating 110 and improving adjustment efficiency and accuracy. The output end of the grating locking mechanism 300 is connected to the grating assembly 100 for locking the reflective grating 110, preventing it from loosening after adjustment and deflecting under vibration, thus ensuring adjustment reliability.

[0025] For details, please refer to Figure 2 The grating assembly 100 includes a grating support 120, a grating connecting frame 130, and a grating locking frame 140.

[0026] The top of the grating support 120 has a circular mounting hole. The grating connecting frame 130 is fitted onto the outside of the reflective grating 110. The outer wall of the reflective grating 110 is bonded to the inner wall of the grating connecting frame 130 at four points, so that the rotation of the grating connecting frame 130 can drive the reflective grating 110 to rotate synchronously, thereby avoiding direct contact with the reflective grating 110 when adjusting its angle. In use, the grating connecting frame 130 is placed in the mounting hole and can rotate under the action of the output end of the grating rotation mechanism 200. The grating locking frame 140 is similarly... The grating locking frame 140 is located outside the grating connecting frame 130 and contacts the outer end face of the grating connecting frame 130. The grating locking frame 140 locks or releases the rotation of the reflective grating 110 by moving closer to or further away from the grating connecting frame 130 along the axis of the mounting hole. At this time, the mounting hole is a stepped hole, and the inner diameter of one end of the mounting hole is larger than the inner diameter of the other end of the mounting hole, so that the grating locking frame 140 can lock the grating connecting frame 130 by squeezing the grating connecting frame 130. The inner diameter of the other end of the mounting hole is larger than the outer diameter of the reflective grating 110 to avoid obstruction.

[0027] The mounting hole, grating connecting frame 130, reflective grating 110 and grating locking frame 140 are all coaxially connected. The output end of the grating locking mechanism 300 is connected to the grating locking frame 140. The grating locking mechanism 300 can be selected as a telescopic drive or a rotary drive.

[0028] Specifically, in order to facilitate the adjustment of the rotation angle of the grating connecting frame 130, multiple adjustment slots 131 are opened on the outer end face of the grating connecting frame 130. The multiple adjustment slots 131 are circumferentially spaced around the axis of the grating connecting frame 130 and arranged along the radial direction of the grating connecting frame 130, so that the output end of the grating rotation mechanism 200 cooperates with the adjustment slots 131 to drive the grating connecting frame 130 to rotate around its axis.

[0029] The number of adjustable card slots 131 is illustrated using two as an example. Preferably, the adjustable card slots 131 avoid the four points where the adhesive reflective grating 110 is attached.

[0030] Similarly, a plurality of locking adjustment slots 141 are provided on the outer end face of the grating locking frame 140. The plurality of locking adjustment slots 141 are arranged circumferentially around the axis of the grating locking frame 140 and are arranged along the radial direction of the grating locking frame 140. The locking adjustment slots 141 are located outside the circumference of the adjustment latching slot 131 to avoid interference with the grating connecting frame 130 and to avoid the grating 110 being reflected. The number of locking adjustment slots 141 is illustrated by taking two as an example.

[0031] At this time, the output end of the grating rotation mechanism 200 and the output end of the grating locking mechanism 300 are both coaxially set with the mounting hole; preferably, the grating locking frame 140 is threadedly connected to the mounting hole. At this time, by rotating the grating locking frame 140 in both directions, the grating locking frame 140 can be moved closer to or further away from the grating connecting frame 130, which is convenient and simple to operate.

[0032] refer to Figure 3 The grating rotation mechanism 200 includes a rotation drive 210, a rotation support 220, and a rotation claw 230. The connecting end of the rotation drive 210 is connected to the rotation support 220, and the output end of the rotation drive 210 cooperates with the adjustment slot 131 through the rotation claw 230. In the adjustment operation, the rotation drive can drive the rotation claw 230 to rotate according to the preset rotation direction and rotation angle. The rotation claw 230 then drives the reflective grating 110 in the grating connecting frame 130 to rotate by a corresponding angle through the adjustment slot 131, thereby realizing the angle adjustment of the reflective grating 110.

[0033] The rotary drive 210 can be a stepper motor. The output end of the rotary drive 210 is connected to one end of the drive shaft via a coupling, and the other end of the drive shaft is connected to the rotary chuck 230 to drive the synchronous rotation of the rotary chuck 230.

[0034] To accommodate the positions of the adjustment slots 131 on the grating connecting frame 130 of different specifications, the rotating claw 230 includes a claw base 231 and a first claw 232 corresponding to the adjustment slots 131. The claw base 231 is provided with a first adjustment groove, which is arranged in the same direction as the adjustment slots 131, so that the first claw 232 can slide and adjust on the first adjustment groove according to the position of the corresponding adjustment slot 131. After sliding, the claw base 231 and the first claw 232 are fixed by a locking member. In order to avoid the first claw 232 from contacting the outer wall of the reflective grating 110 and damaging the reflective grating 110, in addition to the four bonding points, it is preferable to reserve a clearance gap between the inner wall of the grating connecting frame 130 and the reflective grating 110.

[0035] The inner diameter of the grating locking frame 140 is larger than the length of the claw base 231, so that when the claw base 231 is close to the grating connecting frame 130, the grating locking frame 140 is fitted on the outside of the claw base 231 to avoid interference with the claw base 231.

[0036] refer to Figure 3 and Figure 4 The grating locking mechanism 300 includes a locking drive 310, a locking transmission 320, a locking claw 330, and a torque sensor 340. The connecting end of the locking drive 310 is connected to the rotary support 220, and the output end of the locking drive 310 is connected to the locking claw 330 via the locking transmission 320. The torque sensor 340 is connected between the output end of the locking drive 310 and the locking transmission 320, so that the locking drive 310 drives the locking claw 330 to rotate via the torque sensor 340 and the locking transmission 320. The locking claw 330 cooperates with the locking adjustment groove 141, and the locking claw 330 drives the grating locking frame 140 to rotate via the locking adjustment groove 141, thereby locking and loosening the grating connecting frame 130. With the torque sensor 340, the locking force can be controlled more precisely.

[0037] The locking transmission 320 includes a driving gear 321, a driven gear 322, and a bearing 323. The connecting end of the locking drive 310 is connected to the outside of the rotary support 220 for supporting the locking drive 310. The output end of the locking drive 310 is connected to the driving gear 321 via a torque sensor 340. The driving gear 321 meshes with the driven gear 321 to drive the driven gear 322 to rotate. The driven gear 322 is rotatably connected to the rotary support 220 via the bearing 323. Next, the locking claw 330 is disposed on the end face of the driven gear 322, so that the locking claw 330 can match the corresponding locking adjustment groove 141. The locking claw 330 is slidably connected to the driven gear 322 in the radial direction to adapt to the grating locking frame 140 of different sizes. At this time, the driven gear 322 and the bearing 323 are both coaxially disposed with the grating locking frame 140, so that when the driven gear 322 rotates around its axis, it can drive the grating locking frame 140 to rotate through the locking claw 330.

[0038] To save space and reduce structural complexity, it is preferable to provide a clearance hole on the driven gear 322. The clearance hole is coaxially arranged with the driven gear 322. At this time, the end of the drive shaft extends into the clearance hole. The drive shaft and the driven gear 322 are coaxially arranged. The clearance hole is sleeved on the outside of the rotating pawl 230 so that the rotating pawl 230 can rotate freely.

[0039] Preferably, in order to facilitate the adjustment of the center height of the driven gear 322 and the center height of the rotating pawl 230, a height adjustment frame 221 is preferably provided at the bottom of the rotating support 220, and the height adjustment frame 221 is movably connected to the rotating support 220.

[0040] Example 2 refer to Figure 5 and Figure 6 Based on the spin angle adjustment device of the reflective grating provided in Embodiment 1, this embodiment provides a method for adjusting the spin angle of the reflective grating, including the following steps: The spin angle adjustment device of the reflective grating, the light source 400, the camera 500 and the whiteboard 600 were all debugged and set on the support base 700; Adjust the height of the light source 400 so that the height of the light is the same as the center height of the reflective grating 110; Adjust the position and orientation of the light source 400 on the support 700 so that the light is irradiated onto the whiteboard 600 after being split by the reflective grating 110. Adjust the camera's height by 500 to capture the diffraction spot; The rotation angle of the reflection grating 110 is determined by the deviation between the collected diffraction spot and the target angle. The grating rotation mechanism 200 drives the reflective grating 110 to rotate around its axis according to the rotation angle of the reflective grating 110; The grating locking mechanism 300 locks the grating in the grating assembly 100.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A spin angle adjustment device for a reflective grating, characterized in that, It includes a grating assembly (100), a grating rotation mechanism (200), and a grating locking mechanism (300), wherein a reflective grating (110) is provided in the grating assembly (100). The output end of the grating rotation mechanism (200) is connected to the grating assembly (100) for driving the reflective grating (110) to rotate around its axis by a preset angle; The output end of the grating locking mechanism (300) is connected to the grating assembly (100) to lock the reflective grating (110).

2. The spin angle adjustment device for the reflective grating according to claim 1, characterized in that, The grating assembly (100) includes a grating support (120), a grating connecting frame (130), and a grating locking frame (140). The top of the grating support (120) is provided with an installation hole. The grating connecting frame (130) is sleeved on the outside of the reflective grating (110). The grating connecting frame (130) is movably connected to the installation hole. The installation hole, the grating connecting frame (130) and the reflective grating (110) are all coaxially arranged. The grating locking frame (140) is arranged in the installation hole and contacts the grating connecting frame (130). The grating locking frame (140) is located on the outside of the reflective grating (110). The output end of the grating rotation mechanism (200) is connected to the grating connecting frame (130), and the output end of the grating locking mechanism (300) is connected to the grating locking frame (140).

3. The spin angle adjustment device for the reflective grating according to claim 2, characterized in that, Multiple adjustment slots (131) are provided on one side end face of the grating connecting frame (130). The multiple adjustment slots (131) are arranged circumferentially around the axis of the grating connecting frame (130). The adjustment slots (131) are arranged in the radial direction of the grating connecting frame (130). The output end of the grating rotation mechanism (200) cooperates with the adjustment slots (131).

4. The spin angle adjustment device for the reflective grating according to claim 3, characterized in that, The grating locking frame (140) has multiple locking adjustment slots (141) on one side end face. The multiple locking adjustment slots (141) are circumferentially spaced around the axis of the grating locking frame (140). The locking adjustment slots (141) are arranged along the radial direction of the grating locking frame (140) and are located outside the circumference of the adjustment snap-fit ​​slot (131). The grating locking frame (140) is threadedly connected to the mounting hole.

5. The spin angle adjustment device for the reflective grating according to claim 4, characterized in that, The grating rotation mechanism (200) includes a rotation drive (210), a rotation support (220), and a rotation claw (230). The connecting end of the rotary drive (210) is connected to the rotary support (220). The output end of the rotary drive (210) cooperates with the adjustment slot (131) through the rotary claw (230). The rotary claw (230) drives the grating connecting frame (130) to rotate through the adjustment slot (131).

6. The spin angle adjustment device for the reflective grating according to claim 5, characterized in that, The rotating jaw (230) includes a jaw base (231) and a first jaw (232) corresponding to the adjustment slot (131). The jaw base (231) is provided with a first adjustment slot, which is arranged in the same direction as the adjustment slot (131). The first jaw (232) is movably connected to the jaw base (231) through the first adjustment slot.

7. The spin angle adjustment device for the reflective grating according to claim 6, characterized in that, The grating locking mechanism (300) includes a locking drive (310), a locking transmission (320), a locking claw (330), and a torque sensor (340). The connecting end of the locking drive (310) is connected to the rotating support (220), and the output end of the locking drive (310) is connected to the locking claw (330) through the locking transmission (320). The torque sensor (340) is connected between the output end of the locking drive (310) and the locking transmission (320). The locking claw (330) cooperates with the locking adjustment groove (141), and the locking claw (330) drives the grating locking frame (140) to rotate through the locking adjustment groove (141).

8. The spin angle adjustment device for the reflective grating according to claim 7, characterized in that, The locking transmission (320) includes a driving gear (321), a driven gear (322), and a bearing (323). The connecting end of the locking drive (310) is connected to the outside of the rotating support (220). The driving gear (321) is connected to the output end of the locking drive (310). The driving gear (321) meshes with the driven gear (322). The driven gear (322) is rotatably connected to the rotating support (220) through the bearing (323). The driven gear (322) and the bearing (323) are both coaxially arranged with the grating locking frame (140). The locking claw (330) is arranged on the end face of the driven gear (322) and is slidably connected to the driven gear (322) in the radial direction. The driven gear (322) has a clearance hole, which is sleeved on the outside of the rotating claw (230).

9. The spin angle adjustment device for the reflective grating according to claim 2, characterized in that, The bottom of the rotating support (220) is provided with a height adjustment frame (221), which is movably connected to the rotating support (220).

10. A method for adjusting the spin angle of a reflective grating, characterized in that, The spin angle adjustment device for the reflective grating according to any one of claims 1 to 9 includes the following steps: The spin angle adjustment device of the reflective grating, the light source (400), the camera (500) and the whiteboard (600) were all debugged and set on the support base (700); Adjust the height of the light source (400) so that the height of the light is the same as the center height of the reflective grating (110); Adjust the position and orientation of the light source (400) on the support (700) so that the light is irradiated onto the white board (600) by the diffraction spot after the light is split by the reflective grating (110); Adjust the height of the camera (500) to collect the diffraction spot; The rotation angle of the reflection grating (110) is determined based on the deviation between the collected diffraction spot and the target angle; The grating rotation mechanism (200) drives the reflective grating (110) to rotate around its axis according to the rotation angle of the reflective grating (110); The grating locking mechanism (300) locks the grating in the grating assembly (100).

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