Galvanometer type laser projector focal length adjusting device

Abstract

The utility model relates to the technical field of laser projection, in particular to a galvanometer type laser projector focal length adjusting device which comprises a shell and a projection mechanism. The projection mechanism comprises a mounting plate, a supporting mechanism, a laser, a lens group, a focusing mechanism, a beam splitting assembly and a two-dimensional galvanometer; the mounting plate is connected with the shell; the supporting mechanism is arranged on the mounting plate; the lens group comprises a plurality of lenses arranged along the light path direction; the focusing mechanism drives the tail end lens to move along the light path direction; after light emitted by the laser is collimated by the lens group, the light path direction is changed by the beam splitting assembly, and then the light is emitted from the light hole through the two-dimensional galvanometer. The device has the advantages that defocusing errors caused by deflection of the two-dimensional galvanometer are dynamically compensated through the lens group and the focusing mechanism, the workpiece surface curvature and material characteristics are matched in a self-adaptive mode, the size of focusing light spots is optimized in real time in combination with closed-loop feedback of the optical camera, and the definition and consistency of laser projection contours are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of laser projection technology, and in particular to a focal length adjustment device for a galvanometer-type laser projector. Background Technology

[0002] In the processing, assembly, and quality inspection stages of manufacturing, operators need to quickly and accurately identify the shape, hole positions, cutting lines, and other features of parts. Traditional methods mainly rely on manual comparison using two-dimensional engineering drawings or CAD models displayed on electronic screens. This approach has significant drawbacks: Firstly, the spatial conversion between two-dimensional drawings and three-dimensional objects can easily lead to visual errors, requiring operators to repeatedly adjust their perspective or rely on experience, resulting in low efficiency and a low tolerance for error. Secondly, the feature positioning of complex curved surfaces or high-precision workpieces (such as irregular holes or asymmetrical contours) is difficult to match intuitively using static drawings or screen models, easily leading to processing deviations or assembly errors. Utility Model Content

[0003] In view of this, the present invention aims to provide a focal length adjustment device for a galvanometer-type laser projector, which adjusts the reflection angle of a two-dimensional galvanometer to enable the laser beam to cyclically scan the surface of the workpiece at high speed, forming a visible light trace that matches the model, thereby replacing traditional marking or manual measurement.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: A focal length adjustment device for a galvanometer-type laser projector includes: a housing; a light-transmitting hole provided on the housing; a projection mechanism disposed inside the housing; the projection mechanism includes a mounting plate, a support mechanism, a laser, a lens group, a focusing mechanism, a beam splitting assembly, and a two-dimensional galvanometer; the mounting plate is connected to the housing, and the support mechanism is disposed on the mounting plate; the laser and the lens group are both mounted on the support mechanism; the lens group includes multiple lenses arranged along the optical path direction; the focusing mechanism is disposed on the mounting plate and drives the end lens among the multiple lenses to move along the optical path direction; the beam splitting assembly and the two-dimensional galvanometer are disposed on the mounting plate, and the beam emitted by the laser is collimated by the lens group, the optical path direction is changed by the beam splitting assembly, and then emitted from the light-transmitting hole through the two-dimensional galvanometer.

[0005] Furthermore, it also includes an optical camera, which is mounted on the housing.

[0006] Furthermore, the lens group includes a first lens, a second lens, a third lens, and a fourth lens arranged sequentially along the optical path.

[0007] Furthermore, the support mechanism includes a support frame, a laser bracket, a first lens bracket, a second lens bracket, a third lens bracket, and a fourth lens bracket; the support frame includes a first support frame, a second support frame, a first support rod, a second support rod, and a spring; the first support rod and the second support rod are located between the first support frame and the second support frame, and the first support rod, the second support rod, and the laser beam propagation direction are parallel to each other and not on the same plane; the first support rod and the second support rod sequentially pass through the laser bracket, the first lens bracket, the second lens bracket, the third lens bracket, and the fourth lens bracket; wherein, the laser bracket and the second lens bracket are mounted on a mounting plate, and the spring is sleeved on the first support rod and located between the fourth lens bracket and the second support frame.

[0008] Furthermore, the first lens holder, the second lens holder, the third lens holder, and the fourth lens holder are all provided with through mounting holes along the optical path axis, and three through connecting holes are evenly provided in the circumferential direction of the mounting holes.

[0009] Furthermore, the beam splitting assembly includes a mounting base and an optical axis mirror, a beam splitter, and a fifth lens disposed on the mounting base; the axis of the optical axis mirror, the beam splitter, and the fifth lens is perpendicular to the optical path; the beam splitter is located between the optical axis mirror and the fifth lens and is used to change the optical path direction of the laser.

[0010] Furthermore, the focusing mechanism includes a connecting seat, a motor, a lead screw assembly, a linear guide rail, and an actuating plate; the connecting seat is connected to the mounting plate, the fixed end of the motor is connected to the connecting seat, the output end of the motor is connected to one end of the lead screw assembly via a coupling, and the other end of the lead screw assembly is rotatably connected to the connecting seat via a bearing; the linear guide rail is set on the connecting seat, and the actuating plate is connected to the lead screw nut of the lead screw assembly and the slider of the linear guide rail, and is also connected to the end lens among multiple lenses.

[0011] Furthermore, it also includes multiple fans, which are mounted on the side walls of the housing.

[0012] Furthermore, a light-transmitting aperture is provided on the outer casing, which covers the light-transmitting hole and is connected to the outer casing.

[0013] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0014] 1) By synchronously acquiring workpiece surface images through dual optical cameras, automatic calibration, dynamic error compensation, surface adaptive light intensity adjustment, and in-situ quality inspection can be achieved, which can significantly improve the accuracy of laser projection, environmental adaptability, and operational efficiency.

[0015] 2) By dynamically compensating for defocusing errors caused by the deflection of the two-dimensional galvanometer through the lens group and focusing mechanism, adaptively matching the curvature and material characteristics of the workpiece surface, and combining the closed-loop feedback of the optical camera to optimize the focused spot size in real time, the clarity and consistency of the laser projection outline are significantly improved, solving the problems of projection blurring and energy attenuation in complex curved surfaces and multi-distance scenarios of traditional fixed focal length systems.

[0016] 3) The focal length adjustment device of the galvanometer laser projector of this utility model can reduce the complexity of optical system calibration, extend the service life of laser, and improve adaptability and processing efficiency in industrial scenarios. Attached Figure Description

[0017] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0018] Figure 1 This is a schematic diagram of the focal length adjustment device for a galvanometer-type laser projector provided according to an embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of the focal length adjustment device for a galvanometer-type laser projector after removing the top cover, according to an embodiment of the present utility model.

[0020] Figure 3 This is a schematic diagram of the projection mechanism provided according to an embodiment of the present utility model;

[0021] Figure 4 This is a structural schematic diagram of the focusing mechanism provided according to an embodiment of the present utility model.

[0022] The reference numerals in the accompanying drawings include: 1. Outer shell; 11. Housing; 12. Top cover; 13. Cover plate; 14. Light-transmitting aperture; 2. Projection mechanism; 21. Mounting plate; 22. Support mechanism; 221. Support frame; 222. Laser bracket; 2211. First support frame; 2212. Second support frame; 2213. First support rod; 2214. Second support rod; 2215. Spring; 223. First lens holder; 224. Second lens holder; 225. Third lens holder; 226. Fourth lens holder; 23. Laser... 24. Lens group; 241. First lens; 242. Second lens; 243. Third lens; 244. Fourth lens; 25. Focusing mechanism; 251. Connecting seat; 252. Motor; 253. Lead screw assembly; 254. Linear guide rail; 255. Actuating plate; 26. Beam splitter assembly; 261. Fixing seat; 262. Optical axis lens; 263. Beam splitter; 264. Fifth lens; 27. Two-dimensional galvanometer; 3. Optical camera; 4. Motor control unit; 5. Fan; 6. Laser power supply. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and do not constitute a limitation thereof.

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0025] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] like Figures 1 to 4 As shown in the figure, the focal length adjustment device for a galvanometer-type laser projector provided in this embodiment of the present invention includes: a housing 1, a projection mechanism 2, an optical camera 3, a motor control unit 4, multiple fans 5, and a laser power supply 6. The projection mechanism 2, the laser power supply 6, and the motor control unit 4 are disposed inside the housing 1, while the optical camera 3 and the multiple fans 5 are disposed on the housing 1.

[0029] The outer casing 1 includes a housing 11, a top cover 12, a cover plate 13, and a light-transmitting aperture 14, which together form a box. The housing 11 is a rectangular housing with a top opening. An adjustment window is provided on the beam emission side of the housing 11. The cover plate 13 covers the adjustment window and is connected to the housing 11. The top cover 12 is connected to the top of the housing 11. A light-transmitting hole is provided on the top cover 12, and the light-transmitting aperture 14 covers the light-transmitting hole and is connected to the housing 11. The light-transmitting aperture 14 is a light-transmitting device. The outer casing 1 is an opaque device.

[0030] In this embodiment, the opening on the light-emitting side is mainly for adjusting the beam splitting component 26 and the two-dimensional galvanometer 27 in the projection mechanism 2.

[0031] There are two optical cameras 3, which are symmetrically arranged on the housing 11, located on both sides of the adjustment window. By synchronously acquiring images of the workpiece surface through the dual optical cameras 3, the optical cameras 3 can realize functions such as automatic calibration, dynamic error compensation, surface adaptive light intensity adjustment, and in-situ quality detection. This enables real-time image acquisition and closed-loop feedback control of the workpiece, which can significantly improve the accuracy of laser projection, environmental adaptability, and operational efficiency.

[0032] The projection mechanism 2 includes a mounting plate 21, a support mechanism 22, a laser 23, a lens group 24, a focusing mechanism 25, a beam splitter assembly 26, and a two-dimensional galvanometer 27. The mounting plate 21 is connected to the base plate of the housing 11, and the support mechanism 22 is mounted on the mounting plate 21. Both the laser 23 and the lens group 24 are mounted on the support mechanism 22. The lens group 24 includes multiple lenses arranged along the optical path. The focusing mechanism 25 is mounted on the mounting plate 21 and drives the end lens among the multiple lenses to move along the optical path. The beam splitter assembly 26 and the two-dimensional galvanometer 27 are mounted on the mounting plate 21. The beam emitted by the laser 23 is collimated by the lens group 24, then its optical path direction is changed by the beam splitter assembly 26, and finally emitted from the light-transmitting hole through the two-dimensional galvanometer 27. The laser power supply 6 is used to power the laser 23.

[0033] The support mechanism 22 is arranged along the optical path of the laser 23 and includes a support frame 221, a laser bracket 222, a first lens frame 223, a second lens frame 224, a third lens frame 225, and a fourth lens frame 226.

[0034] The support frame 221 includes a first support frame 2211, a second support frame 2212, a first support rod 2213, a second support rod 2214, and a spring 2215. The first support rod 2213 and the second support rod 2214 are located between the first support frame 2211 and the second support frame 2212. The two ends of the first support rod 2213 and the two ends of the second support rod 2214 are connected to the first support frame 2211 and the second support frame 2212, respectively. The beam propagation directions of the first support rod 2213, the second support rod 2214, and the laser 23 are parallel to each other and not on the same plane. In this embodiment, the first support rod 2213 is located above the second support rod 2214.

[0035] The first support rod 2213 and the second support rod 2214 pass sequentially through the laser bracket 222, the first lens bracket 223, the second lens bracket 224, the third lens bracket 225, and the fourth lens bracket 226. The laser bracket 222 and the second lens bracket 224 are fixed to the mounting plate 21, and both have elongated holes for adjusting their positions along the optical path.

[0036] The first lens holder 223, the third lens holder 225, and the fourth lens holder 226 are movably mounted on the first support rod 2213 and the second support rod 2214. The first lens holder 223 and the third lens holder 225 are manually adjusted and tightened during setup. The fourth lens holder 226 is automatically adjusted by the focusing mechanism 25. A spring 2215 is sleeved on the first support rod 2213 and located between the fourth lens holder 226 and the second support rod 2212.

[0037] The first lens holder 223, the second lens holder 224, the third lens holder 225, and the fourth lens holder 226 are all provided with through mounting holes along the optical path axis, and three through connecting holes are evenly arranged in the circumferential direction of the mounting holes. The first support rod 2213 and the second support rod 2214 pass through different connecting holes respectively, and pass through the laser bracket 222, the first lens holder 223, the second lens holder 224, the third lens holder 225, and the fourth lens holder 226 in sequence.

[0038] Both the first support frame 2211 and the second support frame 2212 have through-holes along the optical path axis for the light beam emitted by the laser 23 to pass through. Three through-holes for connecting the first support rod 2213 and the second support rod 2214 are evenly arranged around the circumference of the through-holes.

[0039] In this embodiment, the three connecting holes are provided mainly to ensure the axis adjustment of the lens group 24 and to realize its axial position adjustment.

[0040] The lens group 24 includes a first lens 241, a second lens 242, a third lens 243, and a fourth lens 244 arranged sequentially along the optical path. The first lens 241 is mounted on the first lens holder 223 through a mounting hole, the second lens 242 is mounted on the second lens holder 224 through a mounting hole, the third lens 243 is mounted on the third lens holder 225 through a mounting hole, and the fourth lens 244 is mounted on the fourth lens holder 226 through a mounting hole.

[0041] First, fix the second lens 242 in place using the second lens holder 224. Then, adjust the positions of the first lens holder 223 and the third lens holder 225 respectively, so that the first lens 241, the second lens 242, and the third lens 243 work together to complete the initial focusing of the beam.

[0042] The focusing mechanism 25 includes a connecting seat 251, a motor 252, a lead screw assembly 253, a linear guide rail 254, and an actuating plate 255. The connecting seat 251 is connected to the mounting plate 21. The fixed end of the motor 252 is connected to the connecting seat 251, and the output end of the motor 252 is connected to one end of the lead screw assembly 253 via a coupling. The other end of the lead screw assembly 253 is rotatably connected to the connecting seat 251 via a bearing. The linear guide rail 254 is mounted on the connecting seat 251. The actuating plate 255 is connected to the lead screw nut of the lead screw assembly 253 and the slider of the linear guide rail 254, and overlaps with the fourth lens holder 226. The motor control unit 4 is used to control the operation of the motor 252.

[0043] The beam splitter assembly 26 includes a mounting base 261 and an optical axis mirror 262, a beam splitter 263, and a fifth lens 264 disposed on the mounting base 261. The axis of the optical axis mirror 262, the beam splitter 263, and the fifth lens 264 is perpendicular to the optical path. The beam splitter 263 is located between the optical axis mirror 262 and the fifth lens 264. The beam splitter 263 is disposed close to the fourth lens 244 along the optical path direction of the laser 23 and is used to change the optical path direction of the laser 23. The fifth lens 264 is used to focus the split beam.

[0044] The position of the beam splitter 263 is corrected by the optical axis mirror 262, so that the beam emitted by the laser 23 can be changed by 90° after passing through the beam splitter 263 and then enter the two-dimensional galvanometer 27.

[0045] In this embodiment, there are nine fans 5 installed on the housing 11 to dissipate heat from the projection mechanism 2, optical camera 3, laser power supply 6 and motor control unit 4 inside the housing 1.

[0046] The working principle of the focus adjustment device for the galvanometer-type laser projector in this embodiment is as follows:

[0047] The beam emitted by laser 23 is initially focused by first lens 241, second lens 242, and third lens 243, and then refocused by fourth lens 244. The focused beam is then redirected by beam splitter 263 by 90° and then emitted from the light-transmitting aperture by two-dimensional galvanometer 27.

[0048] The focusing of the fourth lens 244 is mainly achieved through the focusing mechanism 25. Specifically, the motor 252 drives the actuating plate 255 in a linear motion via the lead screw assembly 253. The actuating plate 255 then drives the fourth lens holder 226 in a linear motion away from the laser 23, thus dynamically adjusting the focal length of the laser 23. When the motor 252 drives the actuating plate 255 in a linear motion towards the laser 23 via the lead screw assembly 253, because the actuating plate 255 and the fourth lens holder 226 are connected, the spring force of the spring 2215 is needed to drive the actuating plate 255 in a linear motion towards the laser 23, completing the reverse adjustment.

[0049] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A galvanometer laser projector focal length adjustment device, characterized in that, The application relates to a laser projection device. The device comprises a housing, a light-transmitting hole arranged on the housing, a projection mechanism arranged in the housing, a mounting plate connected with the housing, a supporting mechanism arranged on the mounting plate, a laser, a lens group, a focusing mechanism, a beam splitting assembly and a two-dimensional galvanometer. The laser and the lens group are both mounted on the supporting mechanism, and the lens group comprises a plurality of lenses arranged along an optical path direction. The focusing mechanism is arranged on the mounting plate and drives a terminal lens in the plurality of lenses to move along the optical path direction. The beam splitting assembly and the two-dimensional galvanometer are arranged on the mounting plate, the light beam emitted by the laser is collimated by the lens group, the optical path direction of the light beam is changed by the beam splitting assembly, and the light beam is emitted from the light-transmitting hole through the two-dimensional galvanometer. The device further comprises an optical camera arranged on the housing. The lens group comprises a first lens, a second lens, a third lens and a fourth lens arranged along an optical path.

2. The galvanometer laser projector focal length adjustment device of claim 1, wherein, The supporting mechanism comprises a supporting frame, a laser support, a first lens support, a second lens support, a third lens support and a fourth lens support.

3. The galvanometer laser projector focal length adjustment device of claim 1, wherein, The supporting frame comprises a first supporting frame, a second supporting frame, a first supporting rod, a second supporting rod and a spring.

4. The galvanometer laser projector focal length adjustment device of claim 3, wherein, The first supporting rod and the second supporting rod are located between the first supporting frame and the second supporting frame, the light beam propagation direction of the first supporting rod, the second supporting rod and the laser are parallel to each other and not in the same plane. The first supporting rod and the second supporting rod sequentially penetrate the laser support, the first lens support, the second lens support, the third lens support and the fourth lens support. The laser support and the second lens support are mounted on the mounting plate, the spring is sleeved on the first supporting rod and located between the fourth lens support and the second supporting frame. The first lens support, the second lens support, the third lens support and the fourth lens support are all provided with penetrating mounting holes along the optical path axis direction, and three penetrating connecting holes are uniformly arranged in the circumferential direction of the mounting holes. The beam splitting assembly comprises a fixed seat, an optical axis mirror, a beam splitter and a fifth lens arranged on the fixed seat; the axis line of the optical axis mirror, the beam splitter and the fifth lens is perpendicular to the optical path; the beam splitter is located between the optical axis mirror and the fifth lens and used for changing the optical path direction of the laser.

5. The galvanometer laser projector focal length adjustment device of claim 4, wherein, The focusing mechanism comprises a connecting seat, a motor, a screw rod assembly, a linear guide rail and a dial plate; the connecting seat is connected with the mounting plate, the fixed end of the motor is connected with the connecting seat, the output end of the motor is connected with one end of the screw rod assembly through a shaft coupling, the other end of the screw rod assembly is rotatably connected to the connecting seat through a bearing; the linear guide rail is arranged on the connecting seat; the dial plate is connected with the female thread of the screw rod assembly and the sliding block of the linear guide rail respectively and connected with a terminal lens in the plurality of lenses.

6. The galvanometer laser projector focal length adjustment device of claim 1, wherein, The device further comprises a plurality of fans arranged on the side wall of the housing.

7. The galvanometer laser projector focal length adjustment device of claim 1, wherein, ​ 8. The galvanometer laser projector focal length adjustment device of claim 1, wherein, ​ 9. The galvanometer laser projector focal length adjustment device of claim 1, wherein, The light-transmitting port piece is arranged on the shell and covers the light-transmitting hole and is connected with the shell.

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