Light grid projection device

Abstract

The application relates to a grating projection device, which belongs to the field of projection equipment and comprises a carrier, a light source mechanism, an adjusting mechanism, a vibrating mirror module and a grating piece, which are all installed on the carrier; the number of the vibrating mirror modules is two, and the two vibrating mirror modules are both installed on the adjusting mechanism; the adjusting mechanism is used for selectively moving one vibrating mirror module in the two vibrating mirror modules to the propagation path of the light beam emitted by the light source mechanism; the vibrating mirror module is used for reflecting the light beam emitted by the light source mechanism to the grating piece, so that the light beam is projected to the surface of an object to be measured through the grating piece. The vibrating mirror module can be adjusted as required, and the use range is wide.

Description

Technical Field

[0001] This utility model relates to the field of projection equipment, and more specifically, to a grating projection device. Background Technology

[0002] DLP projection, or Digital Light Processing, involves digitally processing image signals before projecting them back into the image. DLP technology utilizes a Digital Micromirror Device (DMD) as the primary processing element to achieve digital optical processing. DLP projection produces high-resolution and stable images, but DLP projectors are expensive. Raster projection, on the other hand, uses a light source that illuminates a grating sheet, projecting the grating onto the surface of the object being measured. The phase change of the grating varies depending on the height of the object, resulting in three-dimensional topographic information carrying two-dimensional planar deformation fringes. During projection, a mirror typically reflects the light beam onto the grating sheet, which then projects the beam onto the object's surface. Traditional projection devices typically use only one mirror, resulting in a limited number and type of mirrors. Replacing the mirror or the entire device is cumbersome and costly in different situations; conversely, a malfunctioning mirror renders the projection device unusable. Furthermore, in existing technologies, the projection of the object at different positions is obtained by controlling the movement of the grating sheet with a motor. However, because the moving grating sheet requires high precision, it is difficult to meet the requirements for obtaining different image information. Utility Model Content

[0003] The purpose of this invention includes, for example, providing a grating projection device that can adjust the galvanometer module as needed to adapt to the usage requirements of different scenarios and has a wide range of applications.

[0004] The embodiments of this utility model can be implemented as follows:

[0005] In a first aspect, this utility model provides a grating projection device, comprising:

[0006] The carrier includes a light source mechanism, an adjustment mechanism, a galvanometer module, and a grating plate, all mounted on the carrier. There are two galvanometer modules, both mounted on the adjustment mechanism. The adjustment mechanism is used to selectively move one of the two galvanometer modules onto the propagation path of the light beam emitted by the light source mechanism. The galvanometer module reflects the light beam emitted by the light source mechanism onto the grating plate, so that the light beam is projected onto the surface of the object under test through the grating plate.

[0007] In an optional embodiment, the light source mechanism includes a light source generator, a beam collimator, a phase modulator, and a dissipation element arranged sequentially along the beam propagation path. The beam collimator is used to convert the beam emitted by the light source generator into a parallel beam; the phase modulator is used to adjust the phase distribution of the parallel beam; and the dissipation element is used to homogenize the phase-modulated beam.

[0008] In an optional embodiment, the adjustment mechanism includes a driver and a linkage component. The driver is mounted on the carrier and connected to the two galvanometer modules via the linkage component. The driver is used to selectively move one of the two galvanometer modules onto the propagation path via the linkage component.

[0009] In an optional embodiment, the linkage component includes a lead screw, a first slider, and a second slider. One end of the lead screw is connected to the driver, and the other end of the lead screw is rotatably connected to the carrier. The first slider and the second slider are both screwed onto the outside of the lead screw and are spaced apart along the axial direction of the lead screw. The first slider and the second slider are both slidably connected to the carrier, and the first slider and the second slider are both fixed relative to the carrier in the circumferential direction of the lead screw.

[0010] The two galvanometer modules are respectively mounted on the first slider and the second slider.

[0011] In an optional embodiment, the carrier is provided with a guide groove extending axially from the lead screw, and both the first slider and the second slider are slidably engaged with the guide groove.

[0012] In an optional embodiment, a limiting block is provided in the guide groove, the limiting block having a first limiting surface and a second limiting surface disposed opposite to each other in the extending direction of the guide groove; the first slider and the second slider are respectively located on both sides of the limiting block; the first limiting surface is used to contact the first slider to limit the position of the first slider; the second limiting surface is used to contact the second slider to limit the position of the second slider.

[0013] In an optional embodiment, the linkage component further includes two elastic elements distributed on both sides of the lead screw. The two ends of each elastic element are respectively connected to the first slider and the second slider. The elastic elements are used to make the first slider and the second slider tend to move closer to each other or further away from each other.

[0014] In an optional implementation, the elastic element is configured as a tension spring or a compression spring.

[0015] In an optional embodiment, the first slider or the second slider includes a base, a top plate, a level, and a plurality of leveling screws; the base is screwed to the lead screw, the top plate is fixed to the base by the plurality of leveling screws, and the level is mounted on the top plate;

[0016] The galvanometer module is mounted on the top plate.

[0017] In an optional embodiment, the galvanometer module includes an angle adjustment motor and a reflector. The angle adjustment motor is connected to the adjustment mechanism, and the reflector is connected to the rotation shaft of the angle adjustment motor. The angle adjustment motor is used to adjust the reflection angle of the reflector. The reflector is used to receive the light beam emitted by the light source mechanism and reflect it to the grating sheet.

[0018] The beneficial effects of this utility model embodiment include, for example:

[0019] In summary, the grating projection device provided in this embodiment, by configuring two galvanometer modules, allows for the selection of one module based on specific needs, thus adapting to the requirements of different scenarios. For example, if one galvanometer module malfunctions, it can be moved away using an adjustment mechanism, and the other module can be aligned with the propagation path of the light beam emitted by the light source mechanism, ensuring the projection device can function normally. This improves upon the prior art where damaged reflectors require repair or replacement before normal operation, shortening the downtime, reducing operational difficulty, and effectively avoiding the problem of reduced precision caused by repair or replacement. Alternatively, two different galvanometer modules can be configured, such as those with different reflectivities, wavelength adaptability, or resolutions. This allows for the use of a galvanometer module that better meets the requirements in specific situations, in conjunction with the light source mechanism and grating sheet, thereby improving the quality of the projected image. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the grating projection device in this embodiment;

[0022] Figure 2 This is a schematic diagram of the light source mechanism in this embodiment;

[0023] Figure 3 This is a schematic diagram of a first state of a portion of the structure of the grating projection device in this embodiment;

[0024] Figure 4 This is a schematic diagram of a second state of a portion of the structure of the grating projection device in this embodiment;

[0025] Figure 5 This is a schematic diagram of a third state of a portion of the structure of the grating projection device in this embodiment.

[0026] icon:

[0027] 001-Centerline; 100-Carrier; 110-Guide groove; 120-First limiting block; 130-Second limiting block; 200-Light source mechanism; 210-Light source generator; 220-Beam collimator; 230-Phase modulator; 240-Dissipation element; 300-Adjustment mechanism; 310-Driver; 320-Linkage assembly; 321-Lead screw; 322-First slider; 3221-First clearance groove; 323-Second slider; 3231-Second clearance groove; 324-Elastic element; 400-First galvanometer module; 410-Angle adjustment motor; 420-Reflector; 500-Second galvanometer module; 600-Raster plate. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present 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 present invention without inventive effort are within the scope of protection of the present invention.

[0030] 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.

[0031] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is usually placed during use, they are only for the convenience of describing this utility model 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 this utility model.

[0032] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0033] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0034] In existing technologies, projection devices are generally equipped with a single galvanometer module, meaning they cannot be adapted to different needs. When the galvanometer module malfunctions, the projection device becomes unusable, requiring repair or replacement, which is cumbersome and costly. Furthermore, repair or replacement requires specialized knowledge, such as visiting a professional store, which is time-consuming. Thus, existing projection devices remain unchanged and have significant limitations.

[0035] In view of this, the designers have provided a grating projection device that is versatile and has a wide range of applications.

[0036] Please refer to Figures 1-5 This embodiment provides a grating projection device, including:

[0037] The carrier 100 includes a light source mechanism 200, an adjustment mechanism 300, a galvanometer module, and a grating plate 600, all mounted on the carrier 100. There are two galvanometer modules, both mounted on the adjustment mechanism 300. The adjustment mechanism 300 is used to selectively move one of the two galvanometer modules onto the propagation path of the light beam emitted by the light source mechanism 200. The galvanometer module is used to reflect the light beam emitted by the light source mechanism 200 to the grating plate 600, so that the light beam can be projected onto the surface of the object to be measured through the grating plate 600.

[0038] As described above, the grating projection device provided in this embodiment operates as follows:

[0039] Adjust a galvanometer module to the propagation path of the beam emitted by the light source mechanism 200 as required; then, start the light source mechanism 200, which can emit a beam, and the beam is reflected by the galvanometer module after reaching the galvanometer module to the grating plate 600, and then the beam is projected onto the surface of the object to be measured through the grating plate 600.

[0040] Because it is equipped with two galvanometer modules, one of them can be selected for use according to the needs of different scenarios. For example, if one galvanometer module malfunctions, the faulty module can be removed using the adjustment mechanism 300, and the other galvanometer module can be adjusted to be on the propagation path of the beam emitted by the light source mechanism 200, thus ensuring that the projection device can function normally. This improves upon the situation in the prior art where the reflector 420 needs to be repaired or replaced after damage, shortening the downtime, reducing operational difficulty, and effectively avoiding the problem of reduced fitting accuracy caused by repair or replacement. Alternatively, two different types of galvanometer modules can be configured, such as those with different reflectivities, wavelength adaptability, or resolutions. In this way, the galvanometer module that better meets the needs can be used in conjunction with the light source mechanism 200 and the grating sheet 600 in corresponding situations, improving the quality of the projected image.

[0041] The following embodiments illustrate the details of the grating projection device of this application by way of example.

[0042] Please refer to Figures 1-5 In this embodiment, optionally, the grating projection device includes a carrier 100, a light source mechanism 200, an adjustment mechanism 300, a first galvanometer module, a second galvanometer module, and a grating sheet 600. The light source mechanism 200, the adjustment mechanism 300, and the grating sheet 600 can all be mounted on the carrier 100. The first galvanometer module and the second galvanometer module are both mounted on the adjustment mechanism 300. The adjustment mechanism 300 can adjust the position of the first galvanometer module and the second galvanometer module relative to the light source mechanism 200 as needed, so that one of them moves into the propagation path of the light beam emitted by the light source mechanism 200.

[0043] It should be understood that the first and second galvanometer modules can be of the same or different models. When they are the same model, if one is damaged, the other can be directly adjusted to the position corresponding to the light source mechanism 200 and used immediately. When they are different models, their positions can be adjusted for different scenarios to select the appropriate galvanometer module.

[0044] The carrier 100 can be configured as a housing, and the carrier 100 has a cavity inside, which can provide installation space for various components. It should be understood that the carrier 100 is provided with a window for the propagation of the light beam.

[0045] Furthermore, the carrier 100 is internally provided with two guide grooves 110, which are arranged in parallel and spaced apart, with their openings facing each other. A first limiting block 120 and a second limiting slider are respectively provided within each of the two guide grooves 110. Both the first limiting block 120 and the second limiting slider have a first limiting surface and a second limiting surface that are opposite each other in the extending direction of the guide groove 110, and the first limiting block 120 and the second limiting block 130 are spaced apart.

[0046] Optionally, the light source mechanism 200 includes a light source generator 210, a beam collimator 220, a phase modulator 230, and a dissipation element 240 arranged sequentially in the beam propagation path. The beam collimator is used to convert the beam emitted by the light source generator 210 into a parallel beam; the phase modulator 230 is used to adjust the phase distribution of the parallel beam; and the dissipation element 240 is used to homogenize the phase-modulated beam.

[0047] In practical applications, firstly, the light source generator 210 generates an initial beam, which may be divergent or directional. Next, the beam collimator 220 transforms the divergent beam into a parallel beam, ensuring its directionality and stability. Then, the beam enters the phase modulator 230, where the phase distribution of the light wave is adjusted as needed to achieve specific functions or effects, such as generating interference patterns or performing beam shaping. Finally, the dissipation element 240 homogenizes the phase-modulated beam, eliminating any non-uniform intensity distribution and ensuring that the output beam has consistent brightness throughout the illumination area. The beam propagating from the dissipation element 240 can then illuminate the galvanometer module.

[0048] It should be understood that the light source generator 210 can be set to a laser, LED or halogen lamp, etc., depending on the application scenario.

[0049] Optionally, the adjustment mechanism 300 includes a driver 310 and a linkage assembly 320. The driver 310 is mounted on the carrier 100 and is connected to both the first and second galvanometer modules via the linkage assembly 320. The driver 310 is used to selectively move either the first or second galvanometer module onto the propagation path via the linkage assembly 320.

[0050] For example, the driver 310 can be configured as a servo motor, and the servo motor can be integrated with a motor controller to adjust the working state of the servo motor.

[0051] Optionally, the linkage assembly 320 includes a lead screw 321, a first slider 322, a second slider 323, and two elastic elements 324. One end of the lead screw 321 is fixedly connected to the rotating shaft of the driver 310, and the other end of the lead screw 321 is rotatably connected to the carrier 100 via a bearing. The first slider 322 and the second slider 323 are both screwed onto the outside of the lead screw 321 and are spaced apart along the axial direction of the lead screw 321. The first slider 322 and the second slider 323 are respectively inserted into two guide grooves 110, and both the first slider 322 and the second slider 323 are slidably connected to the carrier 100 along the length of the guide grooves 110. At the same time, under the limitation of the guide grooves 110, the first slider 322 and the second slider 323 are relatively fixed to the carrier 100 in the circumferential direction of the lead screw 321, that is, neither the first slider 322 nor the second slider 323 will rotate relative to the carrier 100. Two elastic elements 324 are distributed on both sides of the lead screw 321. The two ends of each elastic element 324 are connected to the first slider 322 and the second slider 323, respectively. The elastic elements 324 are used to cause the two sliders to tend towards or away from each other. For example, the elastic element 324 can be a tension spring or a compression spring. When the elastic element 324 is a tension spring, it causes the first slider 322 and the second slider 323 to tend towards each other; similarly, when the elastic element 324 is a compression spring, it causes the first slider 322 and the second slider 323 to tend away from each other.

[0052] Simultaneously, the first slider 322 can cooperate with the first limiting block 120 to restrict the position of the first slider 322, and the second slider 323 can cooperate with the second limiting block 130 to restrict the position of the second slider 323. Specifically, the first limiting block 120 is further away from the driver 310 than the second limiting block 130. Furthermore, a first clearance groove 3221 is provided on the side of the first slider 322 corresponding to the second limiting block 130, and a second clearance groove 3231 is provided on the side of the second slider 323 corresponding to the first limiting block 120. The first slider 322 is located on the side where the first limiting surface of the first limiting block 120 is located and can contact the first limiting surface of the first limiting block 120; the second slider 323 is located on the side where the second limiting surface of the second limiting block 130 is located and can contact the second limiting surface of the second limiting block 130.

[0053] Please refer to Figures 3-5In the initial state, the side of the first slider 322 closest to the second slider 323 has a gap with the first limiting surface. When the driver 310 drives the lead screw 321 to rotate clockwise, the first slider 322 and the second slider 323 translate synchronously along the first direction, and the first slider 322 moves closer to the first limiting block 120. As the distance between the first slider 322 and the first limiting block 120 decreases, the second limiting block 130 can pass through the first clearance groove 3221 to avoid interference between the first slider 322 and the second limiting block 130. When the first slider 322 moves to contact the first limiting surface of the first limiting block 120, the first slider 322 and the second slider 323 will no longer continue to move along the first direction, and the position of the first slider 322 is restricted by the first limiting surface. In this state, the second slider 323 has a gap with the second limiting surface of the second limiting block 130. When the position of the second slider 323 needs to be adjusted, the driver 310 drives the lead screw 321 to rotate counterclockwise. The first slider 322 and the second slider 323 move together in a second direction opposite to the first direction. The second slider 323 gradually approaches the second limiting block 130, and the first limiting block 120 can pass through the second clearance groove 3231 to avoid interference between the first limiting block 120 and the second slider 323 until the second slider 323 abuts against the second limiting surface of the second limiting block 130, thereby restricting the second slider 323 from continuing to slide.

[0054] It should be noted that the first galvanometer module is mounted on the first slider 322, and the second galvanometer module 500 is mounted on the second slider 323. Thus, when the first slider 322 contacts the first limiting surface of the first limiting block 120, the first galvanometer module 400 is positioned precisely on the propagation path of the light beam from the light source mechanism 200. Similarly, when the second slider 323 contacts the second limiting surface of the second limiting block 130, the second galvanometer module 500 is positioned precisely on the propagation path of the light beam from the light source mechanism 200. The first limiting block 120 and the second limiting block 130 can respectively achieve the positioning of the two galvanometer modules, resulting in a simple structure, easy manufacturing, low cost, and accurate and reliable positioning of the galvanometer modules. Since the first limiting block 120 and the second limiting block 130 are spaced apart along the length of the guide groove 110, it can be ensured that when the first galvanometer module 400 is located on the beam propagation path of the light source mechanism 200, the center of the first galvanometer module 400 is located on the center line 001 of the light source mechanism 200. At the same time, it can also be ensured that when the second galvanometer module 500 is located on the beam propagation path of the light source mechanism 200, the center of the second galvanometer module 500 is located on the center line 001 of the light source mechanism 200, thus improving the fitting accuracy.

[0055] It should be understood that since both the first slider 322 and the second slider 323 are engaged with the guide groove 110, the sliding of the first slider 322 and the second slider 323 is stable. Furthermore, an elastic element 324 is provided between the first slider 322 and the second slider 323. The elastic element 324 provides elastic force, which can compensate for manufacturing and assembly errors of the first slider 322, the second slider 323, and the lead screw 321, making the first slider 322 and the second slider 323 more tightly connected to the lead screw 321, reducing the likelihood of wobbling and improving the stability of the two galvanometer modules. That is, since the first slider 322, the second slider 323, and the lead screw 321 are threaded, due to manufacturing or assembly errors, the first slider 322 and the second slider 323 may become loose with the lead screw 321. The elastic element 324 ensures that the first slider 322 and the second slider 323 are always kept in a tight position against the lead screw 321, making the operation of the first slider 322 and the second slider 323 more stable.

[0056] Obviously, in other embodiments, the elastic element 324 may not be provided, and the first slider 322 and the second slider 323 may move synchronously by the lead screw 321.

[0057] In other embodiments, optionally, the structures of the first slider 322 and the second slider 323 can be identical. For example, the first slider 322 or the second slider 323 includes a base, a top plate, a level, and multiple leveling screws. The base is screwed onto the lead screw 321 and slidably engages with two guide grooves 110. The top plate is fixed to the base by multiple leveling screws, and the level is mounted on the top plate. The number of leveling screws can be four. Each leveling screw is rotatably mounted on the top plate and will not slide relative to the top plate in its own axial direction; each leveling screw is screwed into the base plate. By rotating the leveling screws, the levelness of the top plate relative to the base can be adjusted, and the levelness of the top plate can be visually obtained with the level, improving assembly quality.

[0058] Optionally, both the first galvanometer module 400 and the second galvanometer module 500 may include an angle adjustment motor 410 and a reflector 420. The reflectors 420 of the two galvanometer modules may be of the same or different types. The angle adjustment motors 410 of the first galvanometer module 400 and the second galvanometer module 500 are respectively mounted on the top plate of the first slider 322 and the top plate of the second slider 323. The reflector 420 is connected to the rotation shaft of the angle adjustment motor 410. The angle adjustment motor 410 can drive the reflector 420 to rotate, thereby adjusting the angle of the reflector 420 so that the light beam reflected by the reflector 420 is projected onto different positions of the grating sheet 600 to meet the usage requirements of different scenarios.

[0059] It should be understood that in other embodiments, a camera may be mounted on the carrier 100 to acquire image information projected by the grating sheet 600 onto the surface of the object being measured.

[0060] The grating projection device provided in this embodiment is versatile, flexible in use, and has a wide range of applications.

[0061] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A grating projection device, characterized in that, include: The carrier (100) includes a light source mechanism (200), an adjustment mechanism (300), a galvanometer module, and a grating plate (600), all mounted on the carrier (100). There are two galvanometer modules, both mounted on the adjustment mechanism (300). The adjustment mechanism (300) is used to selectively move one of the two galvanometer modules onto the propagation path of the light beam emitted by the light source mechanism (200). The galvanometer module is used to reflect the light beam emitted by the light source mechanism (200) onto the grating plate (600) so that the light beam can be projected onto the surface of the object to be measured through the grating plate (600).

2. The grating projection device according to claim 1, characterized in that: The light source mechanism (200) includes a light source generator (210), a beam collimator (220), a phase modulator (230), and a dissipation element (240) arranged sequentially along the beam propagation path. The beam collimator is used to convert the beam emitted by the light source generator (210) into a parallel beam. The phase modulator (230) is used to adjust the phase distribution of the parallel beam. The dissipation element (240) is used to homogenize the phase-modulated beam.

3. The grating projection device according to claim 1, characterized in that: The adjustment mechanism (300) includes a driver (310) and a linkage component (320). The driver (310) is mounted on the carrier (100) and is connected to the two galvanometer modules through the linkage component (320). The driver (310) is used to selectively move one of the two galvanometer modules onto the propagation path through the linkage component (320).

4. The grating projection device according to claim 3, characterized in that: The linkage assembly (320) includes a lead screw (321), a first slider (322), and a second slider (323). One end of the lead screw (321) is connected to the driver (310), and the other end of the lead screw (321) is rotatably connected to the carrier (100). The first slider (322) and the second slider (323) are both screwed onto the outside of the lead screw (321) and are spaced apart along the axial direction of the lead screw (321). The first slider (322) and the second slider (323) are both slidably connected to the carrier (100), and the first slider (322) and the second slider (323) are both fixed relative to the carrier (100) in the circumferential direction of the lead screw (321). The two galvanometer modules are respectively mounted on the first slider (322) and the second slider (323).

5. The grating projection device according to claim 4, characterized in that: The carrier (100) is provided with a guide groove (110) extending axially from the lead screw (321), and the first slider (322) and the second slider (323) are slidably engaged with the guide groove (110).

6. The grating projection device according to claim 5, characterized in that: A limiting block is provided in the guide groove (110). The limiting block has a first limiting surface and a second limiting surface that are disposed opposite to each other in the extension direction of the guide groove (110). The first slider (322) and the second slider (323) are respectively located on both sides of the limiting block. The first limiting surface is used to contact the first slider (322) to limit the position of the first slider (322). The second limiting surface is used to contact the second slider (323) to limit the position of the second slider (323).

7. The grating projection device according to claim 4, characterized in that: The linkage component (320) also includes two elastic elements (324), which are distributed on both sides of the lead screw (321). The two ends of each elastic element (324) are connected to the first slider (322) and the second slider (323) respectively. The elastic elements (324) are used to make the first slider (322) and the second slider (323) tend to move closer to each other or further away from each other.

8. The grating projection device according to claim 7, characterized in that: The elastic element (324) is configured as a tension spring or a compression spring.

9. The grating projection device according to any one of claims 4-8, characterized in that: The first slider (322) or the second slider (323) includes a base, a top plate, a level and a plurality of leveling screws; the base is screwed to the outside of the lead screw (321), the top plate is fixed to the base by the plurality of leveling screws, and the level is mounted on the top plate; The galvanometer module is mounted on the top plate.

10. The grating projection device according to any one of claims 1-8, characterized in that: The galvanometer module includes an angle adjustment motor (410) and a reflector (420). The angle adjustment motor (410) is connected to the adjustment mechanism (300), and the reflector (420) is connected to the rotation shaft of the angle adjustment motor (410). The angle adjustment motor (410) is used to adjust the reflection angle of the reflector (420). The reflector (420) is used to receive the light beam emitted by the light source mechanism (200) and reflect it to the grating sheet (600).

Images