Collimation detection tool for beam expander

Abstract

This invention discloses a collimation testing fixture for a beam expander, comprising a collimating cylinder, a sleeve, and a steel needle assembly. The collimating cylinder has several telescopic channels evenly distributed circumferentially on its side wall. Each telescopic channel houses a clamping unit, and the inner ends of these clamping units enclose a clamping space. The beam expander is inserted into this clamping space. The clamping unit has a first state protruding from the telescopic channel and a second state retracted within the channel. In the first state, the clamping unit releases the beam expander; in the second state, it clamps the beam expander. The sleeve is fitted onto the collimating cylinder, with its inner wall abutting against the outer end of the clamping unit to press the unit from the first state to the second state, thus securing the beam expander. The steel needle assembly includes several steel needles, which are arranged crosswise at the light exit port of the collimating cylinder. This invention ensures high-precision coaxiality between the collimation testing fixture and the beam expander.

Description

Technical Field

[0001] This invention relates to the field of laser emitter beam adjustment technology, and in particular to a collimation detection fixture for a beam expander. Background Technology

[0002] After the laser processing equipment is assembled, the optical path needs to be adjusted. The principle of adjustment is to ensure that each component in the optical path achieves a certain degree of optical coaxiality. As an auxiliary component in the optical path, the beam expander plays the role of enlarging the laser spot diameter and reducing the laser divergence angle. Only by adjusting the divergent light emitted by the laser emitter into parallel light through the beam expander can it be focused into a very small and high-density laser spot by the field lens.

[0003] A beam expander typically consists of a cylindrical lens barrel and a base protruding from the side wall of the lens barrel. During installation of the beam expander and laser emitter, the base is attached to the laser emitter's output port. The lens barrel of the beam expander is aligned with the laser emitter's output port, and then the base and the outer wall of the laser emitter are secured with screws. If the screws are misaligned, a misalignment will occur between the axis of the beam expander and the axis of the laser beam, necessitating adjustment during installation.

[0004] Previously, the method for determining whether a beam expander and a laser emitter were coaxial was to visually check if the beam passed through the center of the beam expander's exit port. However, visual errors can easily lead to misjudgments, which has led to the development of beam expander alignment tools. These tools are fitted onto the beam expander's barrel, and the coaxiality of the beam expander and laser emitter is determined by observing whether the light spot emitted from the alignment tool is equally divided by it. However, these alignment tools are usually threaded onto the beam expander's barrel, and due to the relatively large thread clearance, it is difficult to guarantee high-precision coaxiality between the alignment tool and the beam expander. Summary of the Invention

[0005] The main objective of this invention is to provide a collimation testing fixture for a beam expander, which aims to ensure that the collimation testing fixture and the beam expander have high-precision coaxiality, thereby accurately determining whether there is a deviation between the axis of the beam expander and the axis of the laser beam, so as to indicate the installation and adjustment of the beam expander.

[0006] To achieve the above objectives, the collimation detection fixture for the beam expander proposed in this invention includes a collimating cylinder, a sleeve, and a steel needle assembly. The collimating cylinder has several telescopic channels evenly distributed circumferentially on its sidewall. Each telescopic channel contains a pressure block unit, and the inner ends of the pressure block units enclose a clamping space. The beam expander is inserted into the clamping space. The pressure block unit has a first state protruding from the telescopic channel and a second state retracted within the telescopic channel. When the pressure block unit is in the first state, it releases the beam expander; when it is in the second state, it clamps the beam expander. The sleeve is fitted onto the collimating cylinder, and the inner wall of the sleeve abuts against the outer end of the pressure block unit to press the pressure block unit from the first state to the second state, thereby allowing the pressure block unit to hold the beam expander. The steel needle assembly includes several steel needles, which are arranged crosswise at the light outlet of the collimating cylinder.

[0007] Optionally, each of the pressing blocks includes a clamping block and a telescopic block. The telescopic block passes through the telescopic channel and is telescopically connected to the collimating cylinder. The clamping block is located at one end of the telescopic block facing the clamping space. The telescopic block telescopically extends and retracts in the telescopic channel to cause the clamping block to conform to or detach from the beam expander.

[0008] Optionally, the collimating cylinder forms a telescopic groove on each side of the telescopic channel, and a top protrudes from each opposite side of the sidewall of the telescopic block, with each top opposite to a telescopic groove; an elastic element is provided between each top and a telescopic groove, the elastic element being used to give the pressing block unit an outward tendency.

[0009] Optionally, the abutment includes a guide rod, a mounting base, and a set screw; the guide rod protrudes from the side wall of the telescopic block, one end of the guide rod away from the telescopic block is connected to the side wall of the mounting base, one end of the mounting base faces the telescopic groove, and the other end of the mounting base is fitted with a set screw; one end of the elastic element abuts against the bottom wall of the telescopic groove, and the other end of the elastic element abuts against the mounting base, the elastic element is used to give the mounting base a tendency to move outward, and the set screw is used to restrict the movement of the mounting base.

[0010] Optionally, the side of the clamping block facing away from the telescopic block is a concave arc surface, and the clamping blocks of several pressing units enclose a circular clamping space.

[0011] Optionally, the telescopic block is cylindrical, and the end face of the telescopic block facing the collimating cylinder is a smooth curved surface.

[0012] Optionally, the sleeve includes a connecting sleeve and a pressing sleeve connected together. The pressing sleeve is disposed at one end of the connecting sleeve facing the pressing block unit. The connecting sleeve is sleeved on the collimating sleeve. The inner wall of the pressing sleeve abuts against the outer wall of the pressing block unit to press the pressing block unit from the first state to the second state, so that the pressing block unit holds the beam expander tightly.

[0013] Optionally, the inner wall of the connecting cylinder is provided with an internal thread, and the outer wall of the aligning cylinder is provided with an external thread that matches the internal thread. The connecting cylinder is screwed to the aligning cylinder through the internal thread.

[0014] Optionally, the inner wall surface of the pressing cylinder is an inclined conical surface, and the opening of the pressing cylinder gradually increases along the axial direction.

[0015] Optionally, two sets of steel needle assemblies are provided at the light outlet of the collimating cylinder, and the two sets of steel needle assemblies are arranged in parallel.

[0016] The detection method of the collimation detection fixture of the beam expander of the present invention is as follows: A collimation cylinder is fitted onto the beam expander's barrel, and the sleeve is screwed on to press the pressure block unit until the pressure block unit tightly grips the beam expander, ensuring that the collimation detection fixture is coaxial with the beam expander. Then, the beam expander is installed at the laser's output port using screws, and coaxiality calibration is performed. A projection plate is placed in front of the beam expander's output port. If the beam expander's axis and the laser emitter's axis are coaxial, the laser will perpendicularly irradiate the steel needle assembly along the collimation cylinder, and the laser's shadow on the projection plate will be equally divided by the steel needle's projection. If the beam expander's installation is deflected, and the beam expander's axis and the laser emitter's axis are not coaxial, the line connecting the center of the laser emitter and the center of the beam expander will be an oblique line, and the laser's shadow in the oblique direction will be elongated. This indicates that the beam expander's installation has deflected, instructing the operator to adjust the beam expander's installation, i.e., adjust the beam expander's angle and the screw position, until the laser's shadow on the projection plate is equally divided by the steel needle's projection.

[0017] The collimation testing fixture of the beam expander of this invention uses a plurality of pressure block units spaced apart and equidistantly arranged on the radial cross-section of the collimating cylinder. The pressure block units are synchronously pressed and released by a sleeve, so that no matter what position the pressure block unit is in, the center of the structure formed by the pressure block unit will always be consistent with the center of the collimating cylinder. This ensures that the center of the beam expander held by the pressure block unit is consistent with the center of the collimating cylinder, thus ensuring that the collimation testing fixture and the beam expander have high-precision coaxiality. Subsequently, the beam expander is installed at the light outlet of the laser emitter for coaxiality testing. By observing whether the light shadow of the laser is equally divided, it is possible to accurately determine whether there is a deviation between the axis of the beam expander and the axis of the laser beam, so as to indicate the installation and adjustment of the beam expander. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the working process of an embodiment of the collimation detection fixture for the beam expander of the present invention;

[0020] Figure 2 This is a schematic diagram of an embodiment of the collimation detection fixture for the beam expander of the present invention and the assembly of the beam expander;

[0021] Figure 3 for Figure 2 Exploded view of the collimation testing fixture for the beam expander;

[0022] Figure 4 This is a cross-sectional view of an embodiment of the collimation detection fixture for the beam expander of the present invention;

[0023] Figure 5 This is an axial view of an embodiment of the collimation detection fixture for the beam expander of the present invention;

[0024] Figure 6 This is a schematic diagram of the pressure block unit of an embodiment of the collimation detection fixture for the beam expander of the present invention;

[0025] Figure 7 This is a schematic diagram of the collimation cylinder of an embodiment of the collimation detection fixture for the beam expander of the present invention.

[0026] Explanation of icon numbers:

[0027] label name label name 100 Collimation testing fixture 13 Expansion slot 200 Beam expander 131 First expansion joint 300 laser emitter 132 Second expansion joint 400 projection board 14 Guide rod 1 Collimator 15 Mounting base 11 Retractable channel 16 set screw 12 Pressing unit 2 sleeve 121 Clamping block 21 Connecting cylinder 122 telescopic block 22 Pressing cylinder 124 elastic element 3 steel needle

[0028] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0031] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0032] After the laser processing equipment is assembled, the optical path needs to be adjusted. The principle of adjustment is to ensure that each component in the optical path achieves a certain degree of optical coaxiality. The beam expander, as an auxiliary device in the optical path, plays a role in enlarging the laser spot diameter and reducing the laser divergence angle. Only by adjusting the divergent light emitted by the laser emitter into parallel light through the beam expander can it be focused into a very small and high-density laser spot by the field lens. During this process, it is necessary to ensure that the axis of the beam expander and the axis of the laser beam are aligned. Therefore, a fixture is needed to check the coaxiality of the beam expander and the laser emitter's output port to facilitate the adjustment of the beam expander's installation.

[0033] Therefore, this invention proposes a collimation detection fixture 100 for a beam expander 200, referring to... Figures 1 to 5 An embodiment of the collimation detection fixture 100 for the beam expander 200 of the present invention includes a collimating cylinder 1, a sleeve 2, and a steel needle assembly. A plurality of telescopic channels 11 are evenly distributed circumferentially on the side wall of the collimating cylinder 1. A pressure block unit 12 is inserted through each telescopic channel 11. The inner ends of the plurality of pressure block units 12 enclose a clamping space. The beam expander 200 is inserted into the clamping space. The pressure block unit 12 has a first state protruding from the telescopic channel 11 and a second state retracted within the telescopic channel 11. When... When the pressure block unit 12 is in the first state, the pressure block unit 12 releases the beam expander 200. When the pressure block unit 12 is in the second state, the pressure block unit 12 clamps the beam expander 200. The sleeve 2 is sleeved on the collimating cylinder 1, and the inner wall of the sleeve 2 abuts against the outer end of the pressure block unit 12 to press the pressure block unit 12 from the first state to the second state, so that the pressure block unit 12 holds the beam expander 200. The steel needle assembly includes a plurality of steel needles 3, which are arranged crosswise at the light outlet of the collimating cylinder 1.

[0034] The collimating tube 1 is cylindrical and is fitted onto the tube of the beam expander 200. The inner diameter of the collimating tube 1 is larger than the diameter of the tube of the beam expander 200 to allow the beam expander 200 to move freely. Several telescopic channels 11 are evenly distributed circumferentially on the side wall of the collimating tube 1. Each telescopic channel 11 contains a pressure block unit 12. The pressure block units 12 are spaced apart and equidistantly arranged on the radial cross-section of the collimating tube 1. For example, when there are three pressure block units 12, they are distributed at 120° intervals on the circumference of the collimating tube 1; when there are four pressure block units 12, they are distributed at 90° intervals on the circumference of the collimating tube 1; when there are five pressure block units 12, they are distributed at 72° intervals on the circumference of the collimating tube 1, and so on.

[0035] Each pressure block unit 12 is inserted into the telescopic channel 11 and telescopically connected to the wall of the collimating cylinder 1. That is, the pressure block unit 12 has a first state protruding from the telescopic channel 11 and a second state retracted within the telescopic channel 11. Several pressure block units 12 form an annular clamping space inside the collimating cylinder 1. These pressure block units 12 retract or release synchronously to ensure that the clamping space is always coaxial with the collimating cylinder 1. The beam expander 200 is inserted into this clamping space. When the pressure block unit 12 is in its unpressed natural state (first state), its outer end protrudes from the telescopic channel 11, and the inner diameter of the clamping space is larger than the diameter of the beam expander 200's barrel, thus releasing the beam expander 200. When the several pressure block units 12 are in the synchronously pressed second state, they retract synchronously to encircle and clamp the beam expander 200's barrel.

[0036] A sleeve 2 is fitted around the outer periphery of the collimating cylinder 1. When the sleeve 2 is rotated to the position of the pressure block unit 12, the inner wall of the sleeve 2 abuts against the outer end of the pressure block unit 12, so as to simultaneously press several pressure block units 12 on the radial cross section of the collimating cylinder 1 from the first state to the second state, until the pressure block units 12 tightly grip the beam expander 200. When the sleeve 2 moves away from the pressure block unit 12, the sleeve 2 will simultaneously release the pressure on several pressure block units 12, so that several pressure block units 12 change from the second state to the first state, thereby releasing the beam expander 200. Since several pressure block units 12 are spaced apart and equidistantly arranged on the radial section of the collimating cylinder 1, the force exerted by the sleeve 2 on the pressure block units 12 is also equal. Therefore, no matter what position the pressure block unit 12 is in, the center of its structure will always be consistent with the center of the collimating cylinder 1, thereby ensuring that the center of the beam expander 200 held by the pressure block unit 12 is consistent with the center of the collimating cylinder 1, and thus ensuring that the collimation detection fixture 100 and the beam expander 200 have high-precision coaxiality.

[0037] A steel needle assembly is provided at the light outlet of the collimating cylinder 1. Each steel needle assembly includes several steel needles 3 of equal length. The inner cavity of the collimating cylinder 1 is divided into sector-shaped blocks in its radial section by intersecting reinforcing bars. If the steel needle assembly contains two steel needles 3, the two needles 3 are arranged in a cross shape, and the inner cavity of the collimating cylinder 1 is divided into four sector-shaped blocks in its radial section, each with a central angle of 90°. If the steel needle assembly contains three steel needles 3, the centers of the three needles 3 coincide and they are arranged in a cross shape, and the inner cavity of the collimating cylinder 1 is divided into six sector-shaped blocks in its radial section, each with a central angle of 60°, and so on. Mounting holes for the steel needles 3 are provided on the cylinder wall of the collimating cylinder 1. The steel needles 3 are inserted into the mounting holes and fixedly connected to the collimating cylinder 1. The fixed connection is achieved by screwing bolts into both ends of the steel needles 3 to prevent them from slipping out.

[0038] The collimation testing method of the collimation testing fixture 100 of the beam expander 200 of the present invention is as follows: The collimation cylinder 1 is fitted onto the lens barrel of the beam expander 200, and the sleeve 2 is screwed on to press the pressure block unit 12 until the pressure block unit 12 tightly grips the beam expander 200, ensuring that the collimation testing fixture 100 is coaxial with the beam expander 200. Then, the beam expander 200 is installed at the laser's output port using screws, and coaxiality calibration is performed. A projection plate 400 is provided in front of the output port of the beam expander 200. If the axis of the beam expander 200 and the axis of the laser emitter 300 are coaxial, the laser will perpendicularly irradiate the steel beam along the collimation cylinder 1. In the needle assembly, the light and shadow of the laser on the projection plate 400 will be equally divided by the projection of the steel needle 3. If the installation of the beam expander 200 is deflected, the axis of the beam expander 200 and the axis of the laser emitter 300 will not be coaxial. Then the line connecting the center of the laser emitter 300 and the center of the beam expander 200 will be an oblique line. The light and shadow of the laser in the oblique line direction will be elongated. This indicates that the installation of the beam expander 200 has been deflected. This is to instruct the operator to adjust the installation of the beam expander 200, that is, to adjust the angle of the beam expander 200 and the position of the screw, until the light and shadow of the laser on the projection plate 400 will be equally divided by the projection of the steel needle 3.

[0039] In summary, the collimation detection fixture 100 of the beam expander 200 of the present invention, by setting a plurality of pressure block units 12 at intervals and equal distances on the radial cross section of the collimating cylinder 1, and by synchronously pressing and releasing the plurality of pressure block units 12 through the sleeve 2, ensures that no matter what position the pressure block unit 12 is in, the center of its formation will always be consistent with the center of the collimating cylinder 1, thereby ensuring that the center of the beam expander 200 held by the pressure block unit 12 is consistent with the center of the collimating cylinder 1, and thus ensuring that the collimation detection fixture 100 and the beam expander 200 have high-precision coaxiality. Subsequently, the beam expander 200 is installed at the light outlet of the laser emitter 300 for coaxiality detection. By observing whether the light shadow of the laser is equally divided, it is possible to accurately determine whether there is a deviation between the axis of the beam expander 200 and the axis of the laser beam, so as to indicate the installation and adjustment of the beam expander 200.

[0040] Reference Figure 6 Each pressing unit 12 includes a clamping block 121 and a telescopic block 122. The telescopic block 122 passes through the telescopic channel 11 and is telescopically connected to the collimating cylinder 1. The clamping block 121 is located at the end of the telescopic block 122 facing the clamping space. The telescopic block 122 telescopically extends and retracts in the telescopic channel 11 to drive the clamping block 121 to conform to or retract from the beam expander 200. The telescopic block 122 has a first state protruding from the telescopic channel 11 and a second state retracted within the telescopic channel 11. When the telescopic block 122 is in the first state, the outer end of the telescopic block 122 protrudes from the cylinder wall of the collimating cylinder 1. When the telescopic block 122 is in the second state, the outer end of the telescopic block 122 is flush with the cylinder wall of the collimating cylinder 1.

[0041] The collimating cylinder 1 has a telescopic groove 13 formed on both sides of the telescopic channel 11. The side walls of the telescopic block 122 are respectively provided with a top abutment, and each top abutment is arranged opposite to a telescopic groove 13. An elastic element 124 is provided between each top abutment and a telescopic groove 13. The elastic element 124 is used to make the pressing block unit 12 have an outward tendency.

[0042] It should be explained in detail that the abutment includes a guide rod 14, a mounting base 15, and a set screw 16. The guide rod 14 protrudes from the side wall of the telescopic block 122. One end of the guide rod 14 away from the telescopic block 122 is connected to the side wall of the mounting base 15. One end of the mounting base 15 faces the telescopic groove 13, and the other end of the mounting base 15 is fitted with the set screw 16. One end of the elastic member 124 abuts against the bottom wall of the telescopic groove 13, and the other end of the elastic member 124 abuts against the mounting base 15. The elastic member 124 is used to give the mounting base 15 a tendency to move outward, and the set screw 16 is used to limit the movement of the mounting base 15.

[0043] To enable the expansion and contraction of the pressing unit 12, an expansion groove 13 is formed on each opposite side of each expansion channel 11, wherein, referring to Figure 7 Each telescopic groove 13 includes a first telescopic groove 131 and a second telescopic groove 132 that are connected. The depth of the first telescopic groove 131 is the same as the depth of the second telescopic groove 132. The first telescopic groove 131 is located between the telescopic channel 11 and the second telescopic groove 132 to connect the telescopic channel 11 and the second telescopic groove 132. An elastic element 124 is provided in the second telescopic groove 132. A top abutment is protruding from opposite sides of the sidewall of the telescopic block 122, and an elastic element 124 is provided between the top abutment and the second telescopic groove 132.

[0044] In one embodiment, the top abutment includes a guide rod 14, a mounting base 15, and a set screw 16. The mounting base 15 and the set screw 16 are located in the second telescopic groove 132. The end of the guide rod 14 facing away from the telescopic block is connected to the side wall of the mounting base 15. A guide hole is provided in the middle of the telescopic block 122, extending through the telescopic block 122. The guide hole extends axially along the collimating cylinder 1. A guide rod 14 adapted to the guide hole is inserted into the guide hole. The length of the guide rod 14 is greater than the length of the telescopic block 122, so that both ends of the guide rod 14 pass through the first telescopic groove 131 and extend into the second telescopic groove 132 to connect with the mounting base 15. The first telescopic groove 131 provides space for the guide rod 14 to move reciprocally within the depth range of the first telescopic groove 131. Each second telescopic groove 132 is further provided with a set screw 16, which is threadedly connected to the side wall of the second telescopic groove 132. The height of the set screw 16 is less than the recess depth of the second telescopic groove 132, thereby forming a receiving cavity between the set screw 16 and the bottom wall of the second telescopic groove 132. The mounting base 15 and the elastic element 124 are disposed in the receiving cavity, and the mounting base 15 abuts against the set screw 16. The elastic element 124 includes a spring, one end of which abuts against the bottom wall of the telescopic groove 132, and the other end of which abuts against the mounting base 15. When sleeve 2 is inserted into collimating cylinder 1, the inner wall of sleeve 2 presses the end of telescopic block 122 away from clamping block 121 to drive telescopic block 122 to move guide rod 14 and mounting base 15 toward the axis of collimating cylinder 1 until clamping block 121 fits against the barrel of beam expander 200. At this time, elastic element 124 is in a compressed state, and there is an interaction force between mounting base 15 and elastic element 124. When sleeve 2 is disengaged from telescopic block 122, mounting base 15 drives guide rod 14 and telescopic block 122 to reset under the elastic force of elastic element 124, thereby driving clamping block 121 to separate from the barrel of beam expander 200 until mounting base 15 abuts against set screw 16. Set screw 16 is used to prevent mounting base 15 from popping out of second telescopic groove 132.

[0045] Reference Figure 6 The side of the clamping block 121 facing away from the telescopic block 122 is a concave arc surface. The clamping blocks 121 of several pressing units 12 surround to form a circular clamping space, which is coaxially arranged with the collimating cylinder 1.

[0046] The telescopic block 122 is cylindrical, and the end face of the telescopic block 122 facing the collimating cylinder 1 is a smooth curved surface. Correspondingly, the telescopic channel 11 is a cylindrical channel, and the diameter of the telescopic channel 11 is the same as the diameter of the telescopic block 122.

[0047] Furthermore, the sleeve 2 includes a connecting sleeve 21 and a pressing sleeve 22 connected together. The pressing sleeve 22 is located at the end of the connecting sleeve 21 facing the pressing block unit 12. The connecting sleeve 21 is sleeved on the collimating sleeve 1. The inner wall of the pressing sleeve 22 abuts against the outer wall of the pressing block unit 12, so that the pressing block unit 12 changes from the first state to the second state, so that the pressing block unit 12 holds the beam expander 200 tightly.

[0048] It should be noted that the inner wall of the connecting cylinder 21 is provided with an internal thread, and the outer wall of the aligning cylinder 1 is provided with an external thread that matches the internal thread. The connecting cylinder 21 is screwed to the aligning cylinder 1 through the internal thread.

[0049] The inner wall surface of the pressing cylinder 22 is an inclined conical surface, and the opening of the pressing cylinder 22 gradually increases along the axial direction.

[0050] The connecting cylinder 21 is threadedly connected to the collimating cylinder 1. The rotation of the connecting cylinder 21 on the collimating cylinder 1 will also drive the pressing cylinder 22 to move horizontally toward the pressing block unit 12, thereby causing the inner conical surface of the pressing cylinder 22 to move, which in turn presses the telescopic block 122 toward the axis of the collimating cylinder 1 until the clamping block 121 hugs the barrel of the beam expander 200. At this time, the connecting cylinder 21 is locked and cannot rotate further. When the connecting cylinder 21 rotates in the opposite direction, the pressing cylinder 22 gradually moves away from the telescopic block 122, thereby releasing the pressure on the telescopic block 122.

[0051] It is worth mentioning that the inner wall surface of the pressing cylinder 22 is set as an inclined conical surface, that is, the opening of the pressing cylinder 22 gradually increases along the axial direction, and the telescopic block 122 is locked at different positions on the conical surface, which can realize the variable diameter adjustment of the clamping space to adapt to different adjustment requirements of the beam expander 200.

[0052] In this invention, the steel needle 3 can be made of tungsten steel, which is a sintered composite material containing at least one metal carbide. It has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance, and corrosion resistance.

[0053] In one embodiment of the present invention, two sets of steel needle assemblies are provided at the light outlet of the collimating cylinder 1, and the two sets of steel needle assemblies are arranged in parallel.

[0054] The purpose of setting up two sets of steel needle assemblies in this embodiment is that when the installation of the beam expander 200 is deflected, and the axis of the beam expander 200 and the axis of the laser emitter 300 are not on the same axis, the light and shadow of the laser on the projection plate 400 will not be equally divided by the projection of the steel needle 3, but two cross shadows will appear. This allows for a more intuitive judgment that the axis of the beam expander 200 and the axis of the laser beam do not overlap.

[0055] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A collimation testing fixture for a beam expander, characterized in that, include: A collimating cylinder has several telescopic channels evenly distributed circumferentially on its side wall. Each telescopic channel has a pressing block unit inserted through it. The inner ends of the pressing block units enclose a clamping space. The beam expander is inserted into the clamping space. The pressing block unit has a first state protruding from the telescopic channel and a second state retracted into the telescopic channel. When the pressing block unit is in the first state, it releases the beam expander. When the pressing block unit is in the second state, it clamps the beam expander. A sleeve is fitted onto the collimating cylinder, and the inner wall of the sleeve abuts against the outer end of the pressure block unit to press the pressure block unit from the first state to the second state, so that the pressure block unit holds the beam expander tightly. A steel needle assembly, comprising a plurality of steel needles, wherein the plurality of steel needles are arranged crosswise at the light outlet of the collimating cylinder; Each of the pressing units includes a clamping block and a telescopic block, the telescopic block passing through the telescopic channel and telescopically connected to the collimating cylinder; The collimating cylinder has a telescopic groove formed on both sides of the telescopic channel, and the telescopic block has a top protruding on opposite sides of its sidewall, with each top protruding opposite to a telescopic groove. An elastic element is provided between each of the abutment tops and one of the telescopic grooves, the elastic element being used to give the pressing block unit a tendency to move outward; The abutment includes a guide rod, a mounting base, and a set screw; The guide rod protrudes from the side wall of the telescopic block, and one end of the guide rod away from the telescopic block is connected to the side wall of the mounting base. One end of the mounting base is positioned towards the telescopic groove, and the other end of the mounting base is fitted with a set screw. One end of the elastic element abuts against the bottom wall of the telescopic groove, and the other end of the elastic element abuts against the mounting base. The elastic element is used to give the mounting base a tendency to move outward, and the set screw is used to restrict the movement of the mounting base.

2. The collimation testing fixture for the beam expander as described in claim 1, characterized in that, The clamping block is located at one end of the telescopic block facing the clamping space. The telescopic block extends and retracts in the telescopic channel to cause the clamping block to conform to or detach from the beam expander.

3. The collimation testing fixture for the beam expander as described in claim 2, characterized in that, The side of the clamping block facing away from the telescopic block is a concave arc surface, and the clamping blocks of several pressing block units enclose a circular clamping space.

4. The collimation testing fixture for the beam expander as described in claim 2, characterized in that, The telescopic block is cylindrical, and the end face of the telescopic block facing the collimating cylinder is a smooth curved surface.

5. The collimation testing fixture for the beam expander as described in claim 1, characterized in that, The sleeve includes a connecting sleeve and a pressing sleeve connected together. The pressing sleeve is located at the end of the connecting sleeve facing the pressing block unit. The connecting sleeve is sleeved on the collimating sleeve. The inner wall of the pressing sleeve abuts against the outer wall of the pressing block unit to press the pressing block unit from the first state to the second state, so that the pressing block unit holds the beam expander tightly.

6. The collimation testing fixture for the beam expander as described in claim 5, characterized in that, The inner wall of the connecting cylinder is provided with an internal thread, and the outer wall of the collimating cylinder is provided with an external thread that matches the internal thread. The connecting cylinder is screwed to the collimating cylinder through the internal thread.

7. The collimation testing fixture for the beam expander as described in claim 5, characterized in that, The inner wall surface of the pressing cylinder is an inclined conical surface, and the opening of the pressing cylinder gradually increases along the axial direction.

8. The collimation testing fixture for a beam expander as described in any one of claims 1 to 7, characterized in that, Two sets of steel needle assemblies are provided at the light outlet of the collimating cylinder, and the two sets of steel needle assemblies are arranged in parallel.

Images