A galvanometer center fast calibration device

Abstract

The utility model discloses a kind of galvanometer center quick calibration devices, belong to scanning galvanometer technical field;It includes: galvanometer, the bottom of the galvanometer is equipped with the mounting hole for installing lens;Further including adjusting lens barrel, the top of the adjusting lens barrel is equipped with the connecting portion of detachable connection with the mounting hole, the middle part of the adjusting lens barrel is equipped with two parallelly arranged light barriers, the light barrier can block the inner chamber of the adjusting lens barrel;The middle part of the light barrier is equipped with the light transmission hole coaxially arranged to the adjusting lens barrel, the side of the adjusting lens barrel is equipped with the observation hole for observing the light transmission hole.The utility model can eliminate artificial visual error, simplify calibration process, provide quantitative calibration basis.

Description

Technical Field

[0001] This utility model relates to the field of scanning galvanometer technology, and in particular to a rapid calibration device for the center of a galvanometer. Background Technology

[0002] A laser scanning galvanometer is a key piece of equipment used in laser processing, laser display and other fields. It mainly consists of a galvanometer, a drive motor and a corresponding control system. Its working principle is to use the control system to precisely control the drive motor to make the reflector swing rapidly on two mutually perpendicular axes, thereby changing the direction of laser propagation. When the laser beam shines on the reflector of the galvanometer, the change in the angle of the reflector will cause the laser beam to scan rapidly on the target plane.

[0003] When the laser shines on the reflector, the motor drives the reflector to deflect, thereby changing the laser trajectory to achieve laser processing. The relative positions of the two motors installed inside the galvanometer determine the initial position of the laser after the galvanometer is powered on. When the XY motors are installed accurately, the laser beam will be emitted from the center of the galvanometer's output hole after the galvanometer is powered on, which is considered acceptable. In the traditional method of installing the galvanometer motors, the initial position of the laser is observed and evaluated manually, and then the initial positions of the XY motors are adjusted and calibrated. This operation method is cumbersome, has a large error, and it is difficult to ensure consistency. Utility Model Content

[0004] In view of this, it is necessary to provide a rapid calibration device for the center of a galvanometer to solve the problems of cumbersome laser calibration and poor consistency of existing galvanometers.

[0005] This utility model provides a rapid calibration device for the center of a galvanometer, including a galvanometer with a mounting hole at its bottom for mounting a lens; it also includes an adjusting tube with a connecting part at its top that is detachably connected to the mounting hole; two parallel light-shielding plates are provided in the middle of the adjusting tube, which can block the inner cavity of the adjusting tube; a light-transmitting hole is provided in the middle of the light-shielding plate and coaxially arranged with respect to the adjusting tube; and an observation hole is provided on the side of the adjusting tube for observing the light-transmitting hole.

[0006] Furthermore, the light-transmitting hole is a circular hole with a diameter of 2mm-3mm.

[0007] Furthermore, the connecting part is a threaded interface.

[0008] Furthermore, the two observation holes are respectively disposed between the light-shielding plate and the connecting part, and between the two light-shielding plates.

[0009] Furthermore, the observation hole extends through the adjusting lens tube to form two opposing windows, providing light that facilitates observation.

[0010] Furthermore, the galvanometer includes a mechanical correction unit, which is capable of adjusting the initial position of the galvanometer.

[0011] Furthermore, the light-shielding plate is provided with graduations.

[0012] Furthermore, the scale is a circular scale.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention discloses a rapid calibration device for a galvanometer center, comprising an adjusting mirror tube with two parallel light-shielding plates in its center, which seal the inner cavity of the adjusting mirror tube. A light-transmitting hole, coaxially positioned relative to the adjusting mirror tube, is located in the center of each light-shielding plate. This double-hole structure effectively eliminates assembly errors that may exist with a single-point reference, improving calibration accuracy to within the allowable range of machining. An observation hole is provided on the side of the adjusting mirror tube for viewing the light-transmitting hole, allowing operators to easily compare the laser beam with the hole, significantly shortening calibration time. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the usage state of this utility model; Figure 2 This is a schematic diagram of the structure of the galvanometer in this utility model; Figure 3 This is a schematic diagram of the structure of the adjusting lens tube in this utility model. Figure 1 ; Figure 4 This is a schematic diagram of the structure of the adjusting lens tube in this utility model. Figure 2 ; Figure 5 This is a schematic diagram of the structure of the adjusting lens tube in this utility model. Figure 3 .

[0015] In the diagram, 100 is the galvanometer; 110 is the mounting hole. 200. Adjustment tube; 210. Connecting part; 220. Light shield; 221. Light transmission hole; 222. Scale; 230. Observation hole. Detailed Implementation

[0016] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0017] This embodiment provides a rapid calibration device for the center of a scanning galvanometer, which relates to the technical field of scanning galvanometers 100. By adjusting the cooperation structure between the lens barrel 200 and the light shield 220, a dual-optical-path calibration reference is achieved. Combined with the observation hole 230 and the light transmission hole 221, a visual calibration channel is formed, which has the advantages of eliminating human visual errors, simplifying the calibration process, and providing quantitative calibration basis.

[0018] Please see Figures 1 to 5 This embodiment of a rapid galvanometer centering calibration device includes a galvanometer 100, with a mounting hole 110 at its bottom for mounting a lens. The device also includes an adjusting lens barrel 200, with a connecting part 210 at its top that is detachably connected to the mounting hole 110. The adjusting lens barrel 200 can be connected to the galvanometer 100 via the connecting part 210, which mates with the lens, to calibrate the galvanometer 100. This detachable connection structure allows the calibration device to be adapted to different models of galvanometers 100, improving equipment utilization while ensuring calibration accuracy.

[0019] The middle part of the adjusting lens barrel 200 is provided with two parallel light-shielding plates 220, which can block the inner cavity of the adjusting lens barrel 200; the middle part of the light-shielding plate 220 is provided with a light-transmitting hole 221 coaxially arranged with respect to the adjusting lens barrel 200. The double light-transmitting hole 221 structure can effectively eliminate the assembly error that may exist in the single-point reference, and improve the calibration accuracy to the allowable range of machining.

[0020] The side of the adjusting lens tube 200 is provided with an observation hole 230 for observing the light transmission hole 221, which allows the operator to easily compare and calibrate the laser beam with the light transmission hole 221, significantly shortening the calibration time.

[0021] During use, the adjusting lens tube 200 is mounted on the bottom of the galvanometer 100 via the connecting part 210, and the light-transmitting holes 221 formed by the two light-shielding plates 220 constitute the reference optical path. When the galvanometer 100 is in the initial position, the laser beam passes through the two light-transmitting holes 221 in sequence to form overlapping light spots. The operator can simultaneously observe the relative positions of the two light spots through the side observation hole 230. If there is a misalignment, it indicates that the position of the galvanometer 100 motor needs to be adjusted. This device establishes a dual optical reference through physical structure, transforming complex spatial position calibration into intuitive judgment of light spot overlap.

[0022] In some embodiments, please refer to Figure 2 and Figure 5The light-transmitting aperture 221 is circular, with a diameter of 2mm-3mm. By defining the light-transmitting aperture 221 as a circular aperture and controlling its diameter range, the shape and size of the light spot are made regular, significantly reducing human observation errors and avoiding light interference problems caused by unreasonable aperture size. The optimization of the light spot shape and size makes the observation results more intuitive and reliable, reduces the probability of misjudgment during manual adjustment, and thus ensures the consistency of the initial position calibration of the galvanometer 100.

[0023] In practical implementation, the light-transmitting aperture 221 is a through hole located in the center of the light-shielding plate 220 and coaxial with the adjusting lens tube 200. It can be formed into a circular through hole through machining. Its function is to provide a channel for light to pass through and form an observable light spot. The diameter of the light-transmitting aperture 221 is within the range of 2mm-3mm, which can be achieved by adjusting the size of the machining tool. Its function is to control the size of the light-transmitting area, ensuring that the light spot size meets the observation requirements while avoiding light scattering due to an excessively large aperture or insufficient light transmission due to an excessively small aperture. During the calibration process, the operator observes the position of the light spot at the light-transmitting hole 221 through the observation hole 230, and adjusts the initial position of the galvanometer 100 in conjunction with the mechanical correction unit so that the light spot coincides with the center of the light-transmitting hole 221, thereby achieving rapid calibration of the center of the galvanometer 100. In some embodiments, the top of the adjusting lens barrel 200 is provided with a connecting portion 210 that is detachably connected to the mounting hole 110. The connecting portion 210 is a threaded interface. The threaded interface allows the adjusting lens barrel 200 to quickly connect to the galvanometer 100 instead of the lens, reducing the positioning deviation between the adjusting lens barrel 200 and the galvanometer 100. The self-centering and self-locking properties of the threaded interface ensure the consistency of the calibration reference and effectively prevent loosening of the connection due to vibration during calibration.

[0024] In practical implementation, the threaded interface is a mechanical structure that achieves a detachable connection through the interlocking of internal and external threads. Specifically, it can use metric threads or pipe threads. The threaded structure secures the mounting holes 110 of the adjusting lens barrel 200 and the galvanometer 100 via thread engagement, ensuring connection stability while facilitating quick assembly and disassembly. The standardized design of the threaded interface allows for compatibility with different sizes of the galvanometer 100 mounting holes 110, avoiding installation difficulties due to dimensional deviations.

[0025] During installation, screw the adjusting lens barrel 200 into the mounting hole 110 until the threads are fully engaged. At this point, the adjusting lens barrel 200 and the galvanometer 100 are axially fixed. Disassembly can be achieved by rotating in the opposite direction. The preload generated by the thread engagement eliminates assembly gaps, ensuring the coaxiality of the adjusting lens barrel 200 and the galvanometer 100. This structure allows for assembly and disassembly without additional tools, and provides consistent accuracy during repeated installations.

[0026] In some embodiments, two observation holes 230 are respectively disposed between the light-shielding plate 220 and the connecting portion 210, and between the two light-shielding plates 220. By providing two observation holes 230, the areas between the connecting portion 210 and the light-shielding plate 220, and between the two light-shielding plates 220, are respectively covered, allowing the operator to observe the two light-shielding plates 220 separately and simultaneously observe the path of light from different angles, eliminating visual errors from a single viewing angle. The provision of two observation holes 230 simplifies the manual adjustment process and avoids the problem of decreased calibration efficiency caused by repeatedly switching observation positions.

[0027] In practical implementation, the observation hole 230 is a window opened on the side of the adjusting lens tube 200, which can be implemented by a through hole penetrating the side wall of the adjusting lens tube 200, and is used to observe the position of the light-transmitting hole 221 and the light path. The light-shielding plate 220 is a plate-shaped structure parallel to the middle of the adjusting lens tube 200, which can be made of metal or plastic, and is used to restrict the area through which light passes and form the light-transmitting hole 221.

[0028] During the center calibration of the galvanometer 100, after the adjusting lens barrel 200 is fixed to the mounting hole 110 of the galvanometer 100 via the connecting part 210, the operator can check the alignment of the light-transmitting hole 221 with the light-emitting hole of the galvanometer 100 through the observation hole 230 located between the light-shielding plate 220 and the connecting part 210. Simultaneously, the coaxiality of the two light-transmitting holes 221 can be verified through the observation hole 230 located between the two light-shielding plates 220. After light enters the observation hole 230 from outside the adjusting lens barrel 200, a visible light spot is formed at the light-transmitting hole 221. The operator adjusts the mechanical correction unit of the galvanometer 100 according to the position of the light spot to make the center of the light-transmitting hole 221 coincide. In some embodiments, the observation hole 230 passes through the adjusting lens tube 200 to form two opposing windows. The bidirectional light-transmitting windows form a symmetrical optical path, providing stable observation conditions. This allows the operator to simultaneously compare the positional deviations of the light spots on both sides, significantly reducing the impact of ambient light on calibration accuracy and ensuring the consistency and reliability of the center calibration of the galvanometer 100.

[0029] In practical implementation, the observation hole 230 is a through-hole structure located on the side of the adjusting lens tube 200. It can be implemented using symmetrically distributed circular or rectangular openings. Its function is to allow external light to pass through the internal space of the adjusting lens tube 200, forming a visually identifiable light path. The observation hole 230 penetrates the adjusting lens tube 200, forming two oppositely positioned windows. These windows are light-transmitting areas formed by the symmetrical penetration of the observation hole 230 on both sides of the lens tube. This can be achieved by machining coaxial through holes on both sides of the lens tube. Its function is to enhance the visibility of the internal light path through bidirectional light transmission, avoiding visual errors caused by insufficient light when observing from one side. During calibration, the operator observes the position of the light-transmitting aperture 221 simultaneously through two opposing windows. External light enters the inner cavity of the adjusting lens tube 200 from the two side windows and illuminates the light-transmitting aperture 221 of the light-shielding plate 220, forming a clear light spot projection. When the galvanometer 100 is in an uncalibrated state, the projection position of the light spot on the two side windows will shift. The operator can quickly determine the center position of the galvanometer 100 and complete the calibration by adjusting the galvanometer 100 to make the light spot projections on both sides coincide. In some embodiments, the galvanometer 100 includes a mechanical correction unit. The built-in mechanical correction unit directly adjusts the XY motor and adjusts the initial angle of the reflector. The synergistic effect of the mechanical correction unit and the observation structure enables the adjustment amount of the reflector angle to be quantitatively controlled, thereby ensuring that the laser beam always exits from the center of the light exit hole when stationary, providing a basic guarantee for the accuracy of the subsequent laser scanning path.

[0030] In practical implementation, the mechanical correction unit is a fine-tuning structure integrated inside the galvanometer 100 for adjusting the spatial position of the reflector. Specifically, it can be implemented using a threaded screw or an eccentric wheel structure. The installation angle of the reflector is changed by rotating the screw or turning the eccentric wheel. Adjusting the initial position of the galvanometer 100 is achieved by manually or automatically adjusting the reference angle of the reflector in a stationary state. This can be done through a mechanical transmission structure between the linkage screw and the reflector bracket, aligning the initial deflection angle of the reflector with the central axis of the light-emitting aperture. During the assembly of the galvanometer 100, when the initial position of the reflector deviates from the center of the light exit aperture, the screw in the mechanical correction unit is rotated to push the reflector bracket to produce a slight displacement, thereby correcting the installation angle of the reflector. By observing the positional change of the laser spot in the light-transmitting aperture 221, it can be determined in real time whether the reflector has been adjusted to the target position.

[0031] In some embodiments, the light shield 220 is provided with a scale 222, and the scale 222 line can convert the laser offset into a visual scale 222 reading, so that the calibration process has a repeatable quantitative standard, which significantly improves the calibration efficiency and accuracy, while reducing the complexity of operation.

[0032] In the specific implementation process, the scale 222 is a measurement mark marked on the surface of the light shield 220. It can be implemented by laser etching or mechanical engraving process to provide a visual position reference, so that the relative offset between the laser beam and the light transmission hole 221 can be read directly through the observation hole 230.

[0033] The scale 222 of the light-shielding plate 220 is coaxially set with the light-transmitting aperture 221. During calibration, when the laser beam passes through the light-transmitting aperture 221, its spot position can be projected onto the scale 222 area through the observation hole 230. The operator can directly judge whether the laser beam deviates from the center of the light-transmitting aperture 221 based on the relative position of the spot and the scale 222. If there is a deviation, the spot can be aligned with the center of the scale 222 by adjusting the connection 210 between the lens barrel 200 and the galvanometer 100 or by adjusting the mechanical correction unit of the galvanometer 100. The quantitative reference provided by the scale 222 can reduce the subjective error of visual observation. It should be noted that scale 222 is a circular scale 222. The spatial coordinate reference provided by the circular scale 222 allows the spot offset to be precisely quantified, thereby ensuring the consistency of calibration parameters across multiple batches of products.

[0034] In the specific implementation process, the annular scale 222 is a ring-shaped marking line evenly distributed around the light-transmitting hole 221. It can be formed on the surface of the light shield 220 by laser engraving or chemical etching process. Its function is to provide an angular reference for the position of the light spot, so as to make it easier to judge the direction of the light spot offset through the observation hole 230.

[0035] During the adjustment of the galvanometer 100 motor position, the projected position of the laser spot formed by the laser beam passing through the light-transmitting hole 221 can be visually inspected through the observation hole 230. When the annular scale 222 is coaxial with the adjusting lens barrel 200, the operator can intuitively judge the offset angle of the galvanometer 100 motor installation position based on the positional deviation of the laser spot from the center of the annular scale 222.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the present utility model.

Claims

1. A rapid calibration device for the center of a galvanometer, comprising a galvanometer, wherein the bottom of the galvanometer has a mounting hole for mounting a lens; characterized in that, It also includes an adjustable lens tube, the top of which is provided with a connecting part that is detachably connected to the mounting hole, and the middle of which is provided with two parallel light-shielding plates that can block the inner cavity of the adjustable lens tube; the middle of the light-shielding plate is provided with a light-transmitting hole that is coaxially arranged with respect to the adjustable lens tube, and the side of the adjustable lens tube is provided with an observation hole for observing the light-transmitting hole.

2. The rapid calibration device for galvanometer center according to claim 1, characterized in that, The light-transmitting hole is a round hole with a diameter of 2mm-3mm.

3. The rapid calibration device for the center of a galvanometer according to claim 1, characterized in that, The connecting part is a threaded interface.

4. The rapid calibration device for galvanometer center according to claim 1, characterized in that, The two observation holes are respectively disposed between the light-shielding plate and the connecting part, and between the two light-shielding plates.

5. The rapid calibration device for galvanometer center according to claim 4, characterized in that, The observation hole extends through the adjusting lens tube to form two opposing windows, providing light to aid in observation.

6. The rapid calibration device for galvanometer center according to claim 1, characterized in that, The galvanometer includes a mechanical correction unit, which is capable of adjusting the initial position of the galvanometer.

7. The rapid calibration device for galvanometer center according to claim 1, characterized in that, The light-shielding plate is marked with graduations.

8. The rapid calibration device for galvanometer center according to claim 7, characterized in that, The scale is a circular scale.

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