A full-degree-of-freedom laser filter adjustment device and method

Abstract

The present invention discloses a full-degree-of-freedom laser filtering adjustment device and method, which relate to the field of laser beam adjustment; specifically, the device and method comprise: a base, a mounting carrier, and a laser beam cross-section adjustment device; the base is fixed on a working plane by a first positioning device; a ramp is provided on the base; a ramp that cooperates with the ramp is provided below the mounting carrier, and the ramp below the mounting carrier is fixed by a second positioning device after contacting the ramp; a center hole is provided on the mounting carrier for the laser beam to pass through, and an accommodating space is provided inside the mounting carrier at a position corresponding to the center hole; the laser beam cross-section adjustment device is arranged in the accommodating space; the adjustment device provided by the present invention has a total of four degrees of freedom, involving adjustment in eight directions, and can change the position and size of the beam cross-section according to actual needs; and the structure is simple, which greatly reduces the cost of changing the beam cross-section.

Description

Technical Field

[0001] The present invention relates to the field of laser beam adjustment, and in particular to a full-degree-of-freedom laser filtering adjustment device and method. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

[0003] Compared with ordinary light sources, lasers have three main characteristics, namely good directionality, good coherence and high brightness. During the laser emission process, in addition to the great influence of various lenses on the quality of the laser beam, filters also play a vital role. By using filters, the directionality and coherence of the laser beam can be greatly improved.

[0004] However, most current laser adjustment devices require a central hole with an aperture of about 1 mm for the laser beam to pass through, thereby adjusting the laser beam. Due to the small aperture of the central hole, processing is more difficult. Moreover, if the cross-sectional size of the passing laser beam is to be changed, it can only be achieved by changing the aperture size of the central hole, which undoubtedly increases the difficulty and cost of processing and manufacturing, and reduces the interchangeability of the filter. Summary of the Invention

[0005] The purpose of the present invention is to: in view of the fact that most of the current laser adjustment devices need to be provided with a center hole with an aperture of about 1 mm for the laser beam to pass through, thereby adjusting the laser beam; since the aperture of the center hole is small, it is difficult to process; and if the cross-sectional size of the passing laser beam is to be changed, it can only be achieved by changing the aperture size of the center hole, which undoubtedly increases the difficulty and cost of processing and manufacturing, and reduces the problem of interchangeability. A full-degree-of-freedom laser filter adjustment device and method are provided. The addition of this full-degree-of-freedom laser filter adjustment device not only improves the efficiency of laser beam adjustment in the filter, but also makes the filter have higher interchangeability, thereby solving the above-mentioned problems.

[0006] The technical solutions of the present invention are as follows:

[0007] A full-degree-of-freedom laser filter adjustment device specifically includes the following structure:

[0008] A base, the base being fixed on the working plane by a first positioning device, through which the position of the adjusting device on the X-axis can be adjusted; the base being provided with an inclined platform; that is, the machine base serving as the mounting end of the adjusting device, being mounted on the working plane;

[0009] A mounting carrier is provided with an inclined surface cooperating with the inclined platform below the mounting carrier, and after the inclined surface below the mounting carrier contacts the inclined platform, it is fixed by a second positioning device; under the action of the second positioning device, the position of the adjustment device on the Y axis and the Z axis can be adjusted; a central hole for the laser beam to pass through is opened on the mounting carrier, and an accommodating space is provided inside the mounting carrier at a position corresponding to the central hole; that is, the mounting carrier slides along the inclined surface, which can adjust the position of the mounting carrier on the Y axis on the one hand, and adjust the position of the mounting carrier on the Z axis on the other hand; preferably, in order to facilitate the installation of the laser beam cross-section adjustment device, the mounting carrier is spliced by a main body and a cover plate, and the main body and the cover plate can be fixed by screws (not shown in the figure);

[0010] A laser beam cross-section adjusting device is provided in the accommodating space, and the cross-section size of the laser beam after passing through the central hole can be adjusted by the laser beam cross-section adjusting device.

[0011] Further, the first positioning device is a first screw;

[0012] The base is provided with a first long slot, and the working plane is provided with a preset screw hole that cooperates with the first screw; preferably, the first long slot is provided on both sides of the machine base, and two first screws are installed in each of the first long slots;

[0013] Adjust the position of the base on the X-axis on the working plane and tighten the first screw to fix the base. When in use, loosen the first screw first, then move the base left or right. When it moves to the specified position, tighten the first screw again to complete the fixation of the base.

[0014] Further, the second positioning device is a second screw;

[0015] A reference plate is provided below the mounting carrier, the inclined surface is the lower end surface of the reference plate, a second long slot is provided on the reference plate, and a preset screw hole for cooperating with a second screw is provided on the inclined platform;

[0016] Adjust the position of the mounting carrier on the inclined platform and tighten the second screw to fix the mounting carrier. When in use, first loosen the second screw and then move the mounting carrier so that the mounting carrier slides on the inclined platform. When it moves to the specified position, tighten the second screw to complete the fixation of the mounting carrier.

[0017] Furthermore, the laser beam cross-section adjustment device includes:

[0018] A male connector is placed in the accommodating space and can move up and down in the accommodating space; a matching space is provided inside the male connector, and a first light-transmitting hole is provided on the male connector;

[0019] A female connector is placed in the mating space and can move left and right in the mating space; a second light-transmitting hole is provided on the female connector;

[0020] a first position regulator, which controls the male connector to move up and down within the accommodation space;

[0021] a second position regulator, which controls the left and right movement of the female connector within the mating space;

[0022] The overlapping portion of the first light-transmitting hole and the second light-transmitting hole is used for the laser beam to pass through. By adjusting the relative positions of the male head and the female head, the size of the overlapping portion of the first light-transmitting hole and the second light-transmitting hole is changed to achieve the change of the cross-sectional size of the laser beam.

[0023] Furthermore, the male head is spherical, and the matching space is a slot provided on the male head;

[0024] The female head is spherical;

[0025] The accommodating space is spherical.

[0026] Further, the first position regulator includes: a first adjusting screw and a first positioning ring matched with the first adjusting screw;

[0027] A vertical channel for the first adjusting screw to move up and down is provided on the mounting carrier and located above the accommodating space;

[0028] The first positioning ring is located in the vertical channel, one end of the first adjusting screw passes through the vertical channel and is movably connected to the male head, and the other end is exposed to the outside of the mounting carrier as an operating end; by rotating the first adjusting screw, the male head can move up and down in the accommodating space under the action of the positioning ring.

[0029] Further, the second position adjuster includes: a second adjusting screw and a second positioning ring matched with the second adjusting screw;

[0030] A transverse channel for the second adjusting screw to move left and right is provided on the mounting carrier and located on one side of the accommodating space;

[0031] The second positioning ring is located in the transverse channel, one end of the second adjusting screw passes through the transverse channel and is movably connected to the female head, and the other end is exposed to the outside of the mounting carrier as an operating end; by rotating the second adjusting screw, under the action of the second positioning ring, the female head can move left and right in the fitting space.

[0032] Furthermore, the first adjusting screw is connected to the male head via a bearing;

[0033] The second adjusting screw is connected to the female head via a bearing.

[0034] Based on the above-mentioned full-degree-of-freedom laser filter adjustment device, the present invention proposes a full-degree-of-freedom laser filter adjustment method, which specifically includes the following steps:

[0035] Step S1: adjusting the position of the adjusting device on the X-axis by using the first positioning device;

[0036] Step S2: Using the second positioning device, the position of the adjusting device on the Y axis and the Z axis is adjusted;

[0037] Step S3: Using the laser beam cross-section adjustment device, adjust the cross-section size of the laser beam after passing through the center hole.

[0038] Furthermore, the step S1 includes:

[0039] Adjust the position of the base on the X-axis on the work plane and tighten the first screw to fix the position of the base; that is, first loosen the first screw, then move the base left or right. When it moves to the specified position, tighten the first screw again to complete the fixation of the base.

[0040] The step S2 includes:

[0041] Adjust the position of the mounting carrier on the inclined platform, tighten the second screw, and fix the mounting carrier; that is, first loosen the second screw, then move the mounting carrier so that the mounting carrier slides on the inclined platform, and when it moves to the specified position, tighten the second screw again to complete the fixing of the mounting carrier;

[0042] The step S3 includes:

[0043] The first adjusting screw and the second adjusting screw are rotated to adjust the relative position of the male head and the female head, and the size of the laser beam cross section is changed by changing the size of the overlapping portion of the first light-transmitting hole and the second light-transmitting hole.

[0044] Compared with the existing technology, the beneficial effects of the present invention are:

[0045] A full-degree-of-freedom laser filter adjustment device and method, comprising: a base, the base is fixed on a working plane by a first positioning device, and the position of the adjustment device on the X-axis can be adjusted by the first positioning device; the base is provided with a ramp; a mounting carrier, a ramp is provided below the mounting carrier for cooperating with the ramp, and the ramp below the mounting carrier is fixed by a second positioning device after contacting the ramp; under the action of the second positioning device, the position of the adjustment device on the Y-axis and Z-axis can be adjusted; a center hole is provided on the mounting carrier for the laser beam to pass through, and an accommodating space is provided inside the mounting carrier at a position corresponding to the center hole; a laser beam cross-section adjustment device, the laser beam cross-section adjustment device is arranged in the accommodating space, and the cross-section size of the laser beam after passing through the center hole can be adjusted by the laser beam cross-section adjustment device; the full-degree-of-freedom device has a total of four degrees of freedom, involving adjustment in eight directions, and the position and size of the beam cross-section can be changed according to actual needs, greatly reducing the cost of changing the beam cross-section. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a structural diagram of a full-degree-of-freedom laser filter adjustment device;

[0047] Figure 2 It is a cross-sectional view of a full-degree-of-freedom laser filter adjustment device;

[0048] Figure 3 The figure is a structural schematic diagram of a laser beam cross-section adjustment device in a full-degree-of-freedom laser filtering adjustment device.

[0049] Figure markings: 1-base, 2-inclined platform, 3-mounting carrier, 4-center hole, 5-accommodating space, 6-first screw, 7-first long groove, 8-second screw, 9-second long groove, 10-reference plate, 11-male head, 12-matching space, 13-first light-transmitting hole, 14-female head, 15-second light-transmitting hole, 16-first adjusting screw, 17-first positioning ring, 18-second adjusting screw, 19-second positioning ring, 20-cover plate. DETAILED DESCRIPTION

[0050] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0051] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0052] Example 1

[0053] Compared with ordinary light sources, lasers have three main characteristics, namely good directionality, good coherence and high brightness. During the laser emission process, in addition to the great influence of various lenses on the quality of the laser beam, filters also play a vital role. By using filters, the directionality and coherence of the laser beam can be greatly improved.

[0054] However, most current laser adjustment devices require a central hole with an aperture of about 1 mm for the laser beam to pass through, thereby adjusting the laser beam. Due to the small aperture of the central hole, processing is more difficult. Moreover, if the cross-sectional size of the passing laser beam is to be changed, it can only be achieved by changing the aperture size of the central hole, which undoubtedly increases the difficulty and cost of processing and manufacturing, and reduces the interchangeability of the filter.

[0055] In response to the above problems, this embodiment proposes a full-degree-of-freedom laser filter adjustment device and method. The addition of this full-degree-of-freedom laser filter adjustment device not only improves the efficiency of laser beam adjustment in the filter, but also makes the filter highly interchangeable.

[0056] See also Figure 1-3 , a full-degree-of-freedom laser filter adjustment device, specifically including the following structure:

[0057] A base 1 is fixed to a working plane by a first positioning device, which enables the position of the adjustment device on the X-axis to be adjusted, i.e., the position of the center of the laser beam cross section on the X-axis to be adjusted; a ramp 2 is provided on the base 1; i.e., the machine base serves as the mounting end of the adjustment device and is mounted on the working plane;

[0058] The mounting carrier 3 is provided with an inclined surface cooperating with the inclined platform 2 below. After the inclined surface below the mounting carrier 3 contacts the inclined platform 2, it is fixed by a second positioning device; under the action of the second positioning device, the position of the adjustment device on the Y axis and the Z axis can be adjusted, that is, the position of the center of the laser beam cross section on the Y axis and the Z axis can be adjusted; the mounting carrier 3 is provided with a central hole 4 for the laser beam to pass through, and an accommodating space 5 is provided inside the mounting carrier 3 at a position corresponding to the central hole 4; that is, the mounting carrier 3 slides along the inclined surface, which can adjust the position of the mounting carrier 3 on the Y axis on the one hand, and adjust the position of the mounting carrier 3 on the Z axis on the other hand; preferably, in order to facilitate the installation of the laser beam cross section adjustment device, the mounting carrier 3 is spliced by a body and a cover plate 20, and the body and the cover plate 20 can be fixed by screws (not shown in the figure);

[0059] The laser beam cross-section adjusting device is arranged in the accommodating space 5 , and the cross-section size of the laser beam after passing through the central hole 4 can be adjusted by the laser beam cross-section adjusting device.

[0060] In this embodiment, specifically, the first positioning device is a first screw 6;

[0061] The base 1 is provided with a first long slot 7, and the working plane is provided with a preset screw hole that cooperates with the first screw 6; preferably, the first long slot 7 is provided on both sides of the base, and two first screws 6 are installed in each of the first long slots 7;

[0062] Adjust the position of the base 1 on the X-axis on the working plane and tighten the first screw 6 to fix the base 1;

[0063] When in use, the first screw 6 can be loosened first, and then the base 1 can be moved left and right. After moving to a designated position, the first screw 6 can be tightened to complete the fixation of the base 1.

[0064] In this embodiment, specifically, the second positioning device is a second screw 8;

[0065] A reference plate 10 is provided below the mounting carrier 3, the inclined surface being the lower end surface of the reference plate 10, a second long slot 9 is provided on the reference plate 10, and a preset screw hole for cooperating with the second screw 8 is provided on the inclined platform 2;

[0066] Adjust the position of the mounting carrier 3 on the inclined platform 2 and tighten the second screw 8 to fix the mounting carrier 3;

[0067] When in use, the second screw 8 can be loosened first, and then the mounting carrier 3 is moved to slide on the ramp 2. When it is moved to the specified position, the second screw 8 is tightened to complete the fixation of the mounting carrier 3.

[0068] In this embodiment, specifically, the laser beam cross-section adjustment device includes:

[0069] A male connector 11 is placed in the accommodating space 5 and can move up and down in the accommodating space 5; a matching space 12 is defined inside the male connector 11, and a first light-transmitting hole 13 is provided through the male connector 11;

[0070] A female connector 14 is placed in the mating space 12 and can move left and right in the mating space 12; a second light-transmitting hole 15 is provided on the female connector 14;

[0071] A first position regulator, which controls the male connector 11 to move up and down in the accommodating space 5;

[0072] A second position regulator, which controls the left and right movement of the female connector 14 in the mating space 12;

[0073] The overlapping portion of the first light-transmitting hole 13 and the second light-transmitting hole 15 is used for the laser beam to pass through. By adjusting the relative positions of the male connector 11 and the female connector 14, the size of the overlapping portion of the first light-transmitting hole 13 and the second light-transmitting hole 15 is changed, thereby changing the cross-sectional size of the laser beam.

[0074] In this embodiment, specifically, the male head 11 is spherical, and the matching space 12 is a slot provided on the male head 11;

[0075] The female head 14 is spherical;

[0076] The accommodating space 5 is spherical.

[0077] In this embodiment, specifically, the first position regulator includes: a first adjusting screw 16 and a first positioning ring 17 matched with the first adjusting screw 16;

[0078] A vertical channel for the first adjusting screw 16 to move up and down is provided on the mounting carrier 3 and above the accommodating space 5;

[0079] The first positioning ring 17 is located in the vertical channel, one end of the first adjusting screw 16 passes through the vertical channel and is movably connected to the male head 11, and the other end is exposed to the outside of the mounting carrier 3 as an operating end; by rotating the first adjusting screw 16, under the action of the positioning ring, the male head 11 can move up and down in the accommodating space 5.

[0080] In this embodiment, specifically, the second position adjuster includes: a second adjusting screw 18 and a second positioning ring 19 matched with the second adjusting screw 18;

[0081] A transverse channel for the second adjusting screw 18 to move left and right is provided on the mounting carrier 3 and located on one side of the accommodating space 5;

[0082] The second positioning ring 19 is located in the transverse channel, and one end of the second adjusting screw 18 is movably connected to the female head 14 after passing through the transverse channel, and the other end is exposed to the outside of the mounting carrier 3 as an operating end; by rotating the second adjusting screw 18, under the action of the second positioning ring 19, the female head 14 can move left and right in the matching space 12.

[0083] In this embodiment, specifically, the first adjusting screw 16 is connected to the male head 11 via a bearing (not shown in the figure);

[0084] The second adjusting screw 18 is connected to the female head 14 via a bearing (not shown in the figure).

[0085] This embodiment proposes a full-degree-of-freedom laser filter adjustment method based on the above-mentioned full-degree-of-freedom laser filter adjustment device, which specifically includes the following steps:

[0086] Step S1: adjusting the position of the adjusting device on the X-axis by using the first positioning device;

[0087] Step S2: Using the second positioning device, the position of the adjusting device on the Y axis and the Z axis is adjusted;

[0088] Step S3: Using the laser beam cross-section adjustment device, adjust the cross-section size of the laser beam after passing through the central hole 4.

[0089] In this embodiment, specifically, step S1 includes:

[0090] Adjust the position of the base 1 on the X-axis on the working plane, tighten the first screw 6, and fix the position of the base 1; that is, first loosen the first screw 6, then move the base 1 left and right, and when it moves to the specified position, tighten the first screw 6 again to complete the fixation of the base 1;

[0091] The step S2 includes:

[0092] Adjust the position of the mounting carrier 3 on the inclined platform 2, tighten the second screw 8, and fix the mounting carrier 3; that is, first loosen the second screw 8, then move the mounting carrier 3 so that the mounting carrier 3 slides on the inclined platform 2, and when it moves to the specified position, tighten the second screw 8 again to complete the fixation of the mounting carrier 3;

[0093] The step S3 includes:

[0094] The first adjusting screw 16 and the second adjusting screw 18 are rotated to adjust the relative position of the male head 11 and the female head 14 , and the size of the laser beam cross section is changed by changing the size of the overlapping portion of the first light-transmitting hole 13 and the second light-transmitting hole 15 .

[0095] The above-described embodiments merely represent specific implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of protection of the present application. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the technical concept of the present application, and all such variations and improvements fall within the scope of protection of the present application.

[0096] This background section is provided to generally present the context of the invention, and the work of the presently named inventors, the work to the extent described in this background section, and aspects of the description in this section that did not constitute prior art at the time of filing are neither explicitly nor implicitly admitted to be prior art to the present invention.

Claims

1. A full-degree-of-freedom laser filter adjustment device, characterized in that: include: A base (1), wherein the base (1) is fixed on a working plane by a first positioning device, and the position of the adjustment device on the X-axis can be adjusted by the first positioning device; an inclined platform (2) is provided on the base (1); A mounting carrier (3) is provided with an inclined surface cooperating with the inclined platform (2) below the mounting carrier (3); after the inclined surface below the mounting carrier (3) contacts the inclined platform (2), it is fixed by a second positioning device; under the action of the second positioning device, the position adjustment of the adjustment device on the Y axis and the Z axis can be achieved; a center hole (4) for the laser beam to pass through is opened on the mounting carrier (3), and an accommodating space (5) is provided inside the mounting carrier (3) at a position corresponding to the center hole (4); A laser beam cross-section adjusting device, the laser beam cross-section adjusting device being arranged in the accommodating space (5) and capable of adjusting the cross-section of the laser beam after passing through the central hole (4); The laser beam cross-section adjustment device comprises: A male head (11), the male head (11) is placed in the accommodating space (5) and can move up and down in the accommodating space (5); a matching space (12) is provided inside the male head (11), and a first light-transmitting hole (13) is provided on the male head (11); A female head (14), the female head (14) is placed in the matching space (12) and can move left and right in the matching space (12); the female head (14) is provided with a second light-transmitting hole (15) extending therethrough; a first position regulator, which controls the male head (11) to move up and down in the accommodating space (5); a second position regulator, the second position regulator controlling the female head (14) to move left and right within the mating space (12); The overlapping portion of the first light-transmitting hole (13) and the second light-transmitting hole (15) is used for the laser beam to pass through, and the size of the overlapping portion of the first light-transmitting hole (13) and the second light-transmitting hole (15) is changed by adjusting the relative positions of the male connector (11) and the female connector (14), thereby changing the size of the laser beam cross section.

2. A full-degree-of-freedom laser filter adjustment device according to claim 1, characterized in that: The first positioning device is a first screw (6); The base (1) is provided with a first long slot (7), and the working plane is provided with a preset screw hole that matches the first screw (6); The position of the base (1) on the X-axis on the working plane is adjusted, and the first screw (6) is tightened to achieve the fixation of the base (1).

3. The full-degree-of-freedom laser filter adjustment device according to claim 2, characterized in that: The second positioning device is a second screw (8); A reference plate (10) is provided below the mounting carrier (3), the inclined surface is the lower end surface of the reference plate (10), a second long slot (9) is provided on the reference plate (10), and a preset screw hole for cooperating with a second screw (8) is provided on the inclined platform (2); The position of the mounting carrier (3) on the inclined platform (2) is adjusted, and the second screw (8) is tightened to achieve the fixation of the mounting carrier (3).

4. A full-degree-of-freedom laser filter adjustment device according to claim 3, characterized in that: The male head (11) is spherical, and the matching space (12) is a slot provided on the male head (11); The female head (14) is spherical; The accommodating space (5) is spherical.

5. The full-degree-of-freedom laser filter adjustment device according to claim 4, characterized in that: The first position regulator comprises: a first adjusting screw (16) and a first positioning ring (17) matched with the first adjusting screw (16); A vertical channel for the first adjusting screw (16) to move up and down is provided on the mounting carrier (3) and above the accommodating space (5); The first positioning ring (17) is located in the vertical channel. One end of the first adjusting screw (16) passes through the vertical channel and is movably connected to the male head (11), and the other end is exposed outside the mounting carrier (3) as an operating end. By rotating the first adjusting screw (16), the male head (11) can be moved up and down in the accommodating space (5) under the action of the positioning ring.

6. The full-degree-of-freedom laser filter adjustment device according to claim 5, characterized in that: The second position regulator comprises: a second adjusting screw (18) and a second positioning ring (19) matched with the second adjusting screw (18); A transverse channel for the second adjusting screw (18) to move left and right is provided on the mounting carrier (3) and located on one side of the accommodating space (5); The second positioning ring (19) is located in the transverse channel, one end of the second adjusting screw (18) passes through the transverse channel and is movably connected to the female head (14), and the other end is exposed outside the mounting carrier (3) as an operating end; by rotating the second adjusting screw (18), under the action of the second positioning ring (19), the female head (14) can be moved left and right in the matching space (12).

7. The full-degree-of-freedom laser filter adjustment device according to claim 6, characterized in that: The first adjusting screw (16) is connected to the male head (11) via a bearing; The second adjusting screw (18) is connected to the female head (14) via a bearing.

8. A full-degree-of-freedom laser filter adjustment method, characterized in that: A full-degree-of-freedom laser filter adjustment device according to claim 7, comprising: Step S1: adjusting the position of the adjusting device on the X-axis by using the first positioning device; Step S2: Using the second positioning device, the position of the adjusting device on the Y axis and the Z axis is adjusted; Step S3: Using the laser beam cross-section adjustment device, the cross-section size of the laser beam after passing through the central hole (4) is adjusted.

9. A full-degree-of-freedom laser filter adjustment method according to claim 8, characterized in that: The step S1 comprises: Adjust the position of the base (1) on the X-axis on the working plane, tighten the first screw (6) to fix the position of the base (1); The step S2 includes: Adjust the position of the mounting carrier (3) on the inclined platform (2), tighten the second screw (8), and fix the mounting carrier (3); The step S3 comprises: The first adjusting screw (16) and the second adjusting screw (18) are rotated to adjust the relative position of the male head (11) and the female head (14), and the size of the laser beam cross section is changed by changing the size of the overlapping portion of the first light-transmitting hole (13) and the second light-transmitting hole (15).

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