Laser beam spatial filtering adjusting lens

Abstract

The invention discloses a laser beam spatial filtering adjusting lens which comprises a mounting seat, two focusing assemblies and two XY fine tuning assemblies which are mounted on the mounting seat, and a first lens, a small hole structure and a second lens which are sequentially arranged, the first lens and the second lens are installed on the two focusing assemblies respectively, the small hole structure is installed on one XY fine adjustment assembly, and the focusing assembly used for installing the second lens is installed on the other XY fine adjustment assembly. According to the lens of the scheme, precise position adjustment of each optical element in a spatial filtering system can be met, and meanwhile, mounting and adjusting parts of each optical element are all integrated in one set of lens to form a complete system module. According to the module, the space arrangement size requirement of a space filtering optical system is greatly reduced, meanwhile, the system does not need various precise adjustment mirror brackets any more, the corresponding structural cost can be greatly reduced, and the actual use requirement of highly-integrated modular engineering equipment can be met.

Description

Technical Field

[0001] The invention relates to the field of optical lenses, and more specifically to a laser beam spatial filtering and adjusting lens. Background Art

[0002] Spatial filtering of laser beams is a key technology in optics. It is of great significance to improve the quality of laser beams and minimize stray light. The basic principle of laser spatial filtering is to selectively filter laser beams using a combination of lenses and pinholes. When the laser beam passes through the first lens, the beam is focused on a plane. By placing a tiny pinhole on the plane, the stray light in the beam can be effectively blocked, allowing only the main beam to pass. Subsequently, after the inverse transformation of the second lens, the filtered beam is reformed in the spatial domain. At this time, the quality of the beam is significantly improved, which is of great significance for the imaging effect of the subsequent laser detection system.

[0003] Traditional spatial filtering systems are usually built with various optical precision adjustment frames, which are arranged in order according to the components. Although this system can meet the needs of precise position adjustment of each optical component, the required space is large, and each optical component is relatively independent and not an integrated module. At the same time, the cost of precision optical adjustment frames is very high, so it is difficult to meet the actual use needs of highly integrated modular engineering equipment. Summary of the invention

[0004] The purpose of the present invention is to provide a laser beam spatial filtering and adjusting lens to solve the technical problems existing in the above-mentioned background technology.

[0005] The technical solution of the present invention provides a laser beam spatial filtering adjustment lens, comprising a mounting seat, two focusing components and two XY fine-tuning components installed on the mounting seat, and a lens 1, a pinhole structure and a lens 2 arranged in sequence;

[0006] The lens 1 and the lens 2 are respectively mounted on the two focusing assemblies, the pinhole structure is mounted on one of the XY fine-tuning assemblies, and the focusing assembly for mounting the lens 2 is mounted on the other XY fine-tuning assembly;

[0007] The focusing assembly is used to adjust the distance between lens one, lens two and the pinhole structure, and the XY fine-tuning assembly is used to adjust the coaxiality between lens one, the pinhole assembly and lens two.

[0008] In a preferred embodiment, the lens 1 and the lens 2 are respectively pressed into the two focusing assemblies through the lens pressing ring 1 and the lens pressing ring 2, and the small hole structure is pressed into one of the XY fine-tuning assemblies through the small hole pressing ring.

[0009] In a preferred embodiment, the focusing assembly includes a focusing frame, a transfer structure arranged in the focusing frame, and an adjusting knob threadedly connected to the transfer structure, a rubber ring is arranged between the adjusting knob and the focusing frame, and when the adjusting knob is rotated, the transfer structure moves in a straight line in the focusing frame.

[0010] In a preferred embodiment, a limiting pin is provided on the focusing frame, and a limiting slot is correspondingly provided on the adapter structure, and the limiting pin is inserted into the limiting slot and is slidably connected to the limiting slot.

[0011] In a preferred embodiment, a mounting hole is provided on the focusing frame, and a locking screw and a ball plunger are sequentially provided in the mounting hole from top to bottom. An arc-shaped recess is correspondingly provided on the adjusting knob, and the end of the ball plunger is inserted into the arc-shaped recess.

[0012] In a preferred embodiment, the XY fine-tuning assembly includes a hollow main frame and an XY moving block arranged in the hollow area of ​​the main frame, four groups of XY moving block pre-tightening plungers are installed in the middle of the XY moving block, and an X-axis adjustment member and a Y-axis adjustment member are arranged between the main frame and the XY moving block.

[0013] In a preferred embodiment, the X-direction adjustment member comprises an X-direction preload spring and an X-direction adjustment ball respectively arranged on both sides of the XY moving block, one end of the X-direction preload spring is fixed to the main frame, and the other end is connected to an X-direction compression spring pad, the end surface of the X-direction compression spring pad is slidably connected to the XY moving block, the two sides of the X-direction adjustment ball are respectively in contact with the main frame and the XY moving block, and the interface between the XY moving block and the X-direction adjustment ball is an inclined surface;

[0014] The Y-direction adjustment member comprises a Y-direction preload spring and a Y-direction adjustment ball respectively arranged on both sides of the XY moving block, one end of the Y-direction preload spring is fixed to the main frame, and the other end is connected to a Y-direction compression spring pad, the end surface of the Y-direction compression spring pad is slidably connected to the XY moving block, the two sides of the Y-direction adjustment ball are respectively in contact with the main frame and the XY moving block, and the interface between the XY moving block and the Y-direction adjustment ball is an inclined surface;

[0015] In a preferred embodiment, two limiting slots 1 are provided on the XY moving block for limiting the X-axis adjusting ball and the Y-axis adjusting ball respectively, and two limiting slots 2 are correspondingly provided on the main frame. The inclined surface of the XY moving block is located in the limiting slot 1, and the limiting slot 2 is a V-shaped slot.

[0016] In a preferred embodiment, the inclined surfaces of the XY moving block in contact with the X-axis adjustment ball and the Y-axis adjustment ball have the same inclination angle, and the tangent function value of the angle is 0.1.

[0017] In a preferred embodiment, two adjustment screws are provided on the main frame corresponding to the X-direction adjustment ball and the Y-direction adjustment ball, and the pitch of the adjustment screws is 0.25 mm.

[0018] The beneficial effects of the technical solution of the present invention are:

[0019] The lens of this solution can not only meet the precise position adjustment of each optical element in the spatial filtering system, but also integrate the installation and adjustment components of each optical element into a set of lenses to form a complete system module. This module greatly reduces the spatial arrangement size requirements of the spatial filtering optical system, and has the functional characteristics of precise fine-tuning of the position of optical elements and highly integrated structure. At the same time, the system no longer requires various precision adjustment frames, which can greatly reduce the corresponding structural costs and meet the actual use requirements of highly integrated modular engineering equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the structure of the focusing assembly of the present invention.

[0022] Figure 3 This is a schematic diagram of the XY fine-tuning component structure of the present invention.

[0023] Explanation of the accompanying drawings: 1 mounting seat, 2 lens one, 3 small hole structure, 4 lens two, 5 focusing assembly, 501 focusing frame, 502 adapter structure, 503 adjusting knob, 504 rubber ring, 505 limiting pin, 506 locking screw, 507 ball head plunger, 508 lens pressure ring one, 509 lens pressure ring two, 6XY fine-tuning assembly, 601 main frame, 602XY moving block, 603 pre-tightening plunger, 604X-direction pre-tightening spring, 605X-direction adjusting ball, 606X-direction compression spring pad, 607Y-direction pre-tightening spring, 608Y-direction adjusting ball, 609 limiting slot one, 610 limiting slot two, 611 adjusting screw, 612 small hole pressure ring, 613 front cover, 614 rear cover, 7 adjustable aperture. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and design various embodiments with various modifications suitable for specific uses.

[0025] like Figure 1-Figure 3 As shown, the technical solution of the present invention provides a laser beam spatial filtering adjustment lens, comprising a mounting seat 1, two focusing assemblies 5 and two XY fine-tuning assemblies 6 mounted on the mounting seat 1, and a lens 1 2, a pinhole structure 3 and a lens 2 4 arranged in sequence. The lens 1 2 and the lens 2 4 are respectively mounted on the two focusing assemblies 5, the pinhole structure 3 is mounted on one of the XY fine-tuning assemblies 6, and the focusing assembly 5 for mounting the lens 2 4 is mounted on the other XY fine-tuning assembly 6. The lens 1 2 and the lens 2 4 are respectively pressed into the two focusing assemblies 5 through a lens pressing ring 1 508 and a lens pressing ring 2 509, and the pinhole structure 3 is pressed into one of the XY fine-tuning assemblies 6 through a pinhole pressing ring 612.

[0026] The focusing assembly 5 is used to adjust the distance between lens 1 2 and lens 2 4 and the pinhole structure 3. The pinhole structure 3 will not move forward and backward after installation. The focusing assembly 5 can adjust the forward and backward movement of lens 1 2 and lens 2 4 to achieve focal length adjustment of lens 1 2 and lens 2 4. The XY fine-tuning assembly 6 is used to adjust the coaxiality between lens 1 2, the pinhole assembly and lens 2 4. Here, the XY fine-tuning assembly 6 can indirectly adjust the pinhole structure 3 and lens 2 4 in the plane in the X direction and the Y direction. Here, the X direction and the Y direction refer to two directions perpendicular to each other in the same plane.

[0027] The focus assembly 5 includes a focus frame 501, a transfer structure 502 disposed in the focus frame 501, and an adjustment knob 503 threadedly connected to the transfer structure 502, and a rubber ring 504 is disposed between the adjustment knob 503 and the focus frame 501. A limit pin 505 is disposed on the focus frame 501, and a limit slot is correspondingly disposed on the transfer structure 502. The limit pin 505 is inserted into the limit slot and slidably connected to the limit slot. A mounting hole is disposed on the focus frame 501, and a locking screw 506 and a ball plunger 507 are sequentially disposed in the mounting hole from top to bottom. An arc-shaped notch is correspondingly disposed on the adjustment knob 503, and the end of the ball plunger 507 is inserted into the arc-shaped notch.

[0028] In the above scheme, taking the focusing of lens 1-2 as an example, lens 1-2 is installed in the adapter structure 502, and the end of the ball plunger 507 is located in the arc-shaped recess, which can limit the forward and backward movement of the adjustment knob 503. When the adjustment knob 503 is rotated, the adjustment knob 503 rotates in place, and the adapter structure 502 threadedly connected thereto can limit the axial rotation of the adapter structure 502 due to the existence of the limit pin 505, so that the adapter structure 502 moves along a straight line in the focusing frame 501, thereby ensuring that the adapter structure 502 only performs axial distance compensation, and lens 1-2 is installed in the adapter structure 502 and moves with it, thereby realizing the focal distance adjustment of lens 1-2, focusing the focus of the light beam on the front surface of the pinhole structure 3, and then adjusting the XY position of the pinhole structure 3. The adjustment method of lens 2-4 is the same as that of lens 1-2.

[0029] The XY fine-tuning assembly 6 includes a hollow main frame 601 and an XY moving block 602 arranged in the hollow area of ​​the main frame 601. Four groups of XY moving block 602 pre-tightening plungers 603 are installed in the middle of the XY moving block 602. The pre-tightening plungers 603 can prevent the XY moving block 602 from shaking back and forth in the main frame 601. An X-direction adjusting member and a Y-direction adjusting member are arranged between the main frame 601 and the XY moving block 602, and the adjustment methods of the X-direction adjusting member and the Y-direction adjusting member are the same.

[0030] The X-axis adjustment member includes an X-axis preload spring 604 and an X-axis adjustment ball 605 which are respectively arranged on both sides of the XY moving block 602. One end of the X-axis preload spring 604 is fixed to the main frame 601, and the other end is connected to an X-axis compression spring pad 606. The end surface of the X-axis compression spring pad 606 is slidably connected to the XY moving block 602. Both sides of the X-axis adjustment ball 605 are in contact with the main frame 601 and the XY moving block 602 respectively, and the interface between the XY moving block 602 and the X-axis adjustment ball 605 is an inclined surface.

[0031] The Y-axis adjustment member includes a Y-axis pre-loaded compression spring 607 and a Y-axis adjustment ball 608 which are respectively arranged on both sides of the XY moving block 602. One end of the Y-axis pre-loaded compression spring 607 is fixed to the main frame 601, and the other end is connected to a Y-axis compression spring pad. The end surface of the Y-axis compression spring pad is slidably connected to the XY moving block 602. Both sides of the Y-axis adjustment ball 608 are in contact with the main frame 601 and the XY moving block 602 respectively, and the interface between the XY moving block 602 and the Y-axis adjustment ball 608 is an inclined surface.

[0032] The XY moving block 602 is provided with two limiting notches 1 609 for limiting the X-direction adjustment ball 605 and the Y-direction adjustment ball 608 respectively, and the main frame 601 is provided with two limiting notches 2 610 correspondingly. The inclined surface of the XY moving block 602 is located in the limiting notch 1 609, and the limiting notch 2 610 is a V-shaped notch. The inclined surface of the XY moving block 602 in contact with the X-direction adjustment ball 605 and the Y-direction adjustment ball 608 has the same inclination angle, and the tangent function value of the angle is 0.1. The main frame 601 is provided with two adjustment screws 611 corresponding to the X-direction adjustment ball 605 and the Y-direction adjustment ball 608, and the pitch of the adjustment screw 611 is 0.25mm.

[0033] Taking the position adjustment of the small hole structure 3 as an example, the small hole structure 3 is installed in the XY moving block 602, and the XY moving block 602 is located between the front cover 613 and the rear cover 614. When fine adjustment in the Y direction is required, the front and rear positions of the adjusting screws 611 are adjusted by a wrench. Under the action of the Y-direction preload spring 607, the Y-direction adjusting ball 608 is always tangent to the two surfaces of the V-shaped notch of the limiting notch 2 610 and is always in contact with the cross section of the adjusting screw 611, thereby synchronously moving forward and backward. Since the contact surface corresponding to the XY moving block 602 is an inclined plane with a certain angle, and the tangent function value of the angle is 0.1, and the pitch of the adjusting screw 611 is 0.25mm, the adjusting screw 611 rotates one circle, the Y-direction adjusting ball moves 0.25mm, and the movement amount of the XY moving block 602 along the Y direction is 0.025mm. At this time, the small hole structure 3 has been installed in the XY moving block 602, thereby realizing the precise position adjustment of the small hole structure 3 in the Y direction. The fine adjustment process in the X direction is consistent with the adjustment method in the Y direction, which will not be repeated here.

[0034] When the focus of the light spot coincides with the pinhole structure 3, it is necessary to fine-tune the focal length of the lens 2 and the X and Y positions of the pinhole structure 3 to ensure that the power of the light beam passing through the pinhole structure 3 reaches the maximum value. At this time, the ball plunger 507 is locked in the focusing assembly 5, and the locking screw 506 is screwed in to complete the focal length locking of the lens 2. The locking screw is screwed into the XY fine-tuning assembly 6 to complete the position locking of the pinhole structure 3.

[0035] The installation steps of each component in this scheme are:

[0036] (1) Install the lens 2 in the focusing assembly 5 and press it with the lens pressing ring, then install the small hole structure 3 in the XY fine-tuning assembly 6 and press it with the small hole pressing ring 612; after the above two components are installed, install the corresponding focusing assembly 5 and 5XY fine-tuning assembly 6 on the mounting base 1.

[0037] (2) Then, the corresponding light beam adjustment is performed. The front-to-back distance of lens 2 is adjusted by the focusing assembly 5, and the focus of the light beam is focused on the front surface of the pinhole structure 3. At the same time, the position of the pinhole structure 3 in the X and Y directions is adjusted by the XY fine-tuning assembly 6, so that the center of the pinhole structure 3 coincides with the focus of the light beam focused by lens 2, and the position of lens 2 and pinhole structure 3 is locked.

[0038] (3) After the above adjustment steps are completed, the lens 2 4 is installed in the focusing assembly 5, and the focusing assembly 5 with the lens 2 4 installed is installed in the 5XY fine-tuning assembly 6. The focusing assembly 5 is fixed by a fixing part and the whole is installed in the mounting seat 1.

[0039] (4) Similarly, the front-to-back distance of the lens 2 4 is adjusted by the focusing assembly 5, so that the light beam reaches the designed beam diameter after passing through the lens 2 4, and after ensuring that the divergence angle of the light beam meets the use requirements of the subsequent system, the X and Y positions of the lens 2 4 are adjusted by the 5XY fine adjustment assembly 6 until the position of the light beam meets the designed requirements. Repeat the above locking process to complete the position locking of the lens 2 4.

[0040] (5) Finally, the adjustable diaphragm 7 is installed, and the size of the diaphragm is adjusted by adjusting the adjustment rod on the adjustable diaphragm 7, so that the diameter of the laser beam can be intercepted to the required diameter.

[0041] The lens of this solution can not only meet the precise position adjustment of each optical element in the spatial filtering system, but also integrate the installation and adjustment components of each optical element into a set of lenses to form a complete system module. This module greatly reduces the spatial arrangement size requirements of the spatial filtering optical system, and has the functional characteristics of precise fine-tuning of the position of optical elements and highly integrated structure. At the same time, the system no longer requires various precision adjustment frames, which can greatly reduce the corresponding structural costs and meet the actual use requirements of highly integrated modular engineering equipment.

[0042] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A laser beam spatial filtering and adjusting lens, characterized in that: It comprises a mounting seat, two focusing assemblies and two XY fine-tuning assemblies mounted on the mounting seat, and a lens 1, a pinhole structure, a lens 2 and an adjustable diaphragm which are arranged in sequence; The lens 1 and the lens 2 are respectively mounted on the two focusing assemblies, the pinhole structure is mounted on one of the XY fine-tuning assemblies, and the focusing assembly for mounting the lens 2 is mounted on the other XY fine-tuning assembly; The focusing assembly is used to adjust the distance between lens one, lens two and the pinhole structure, and the XY fine-tuning assembly is used to adjust the coaxiality between lens one, the pinhole assembly and lens two.

2. The laser beam spatial filtering and adjusting lens according to claim 1, characterized in that: The lens 1 and the lens 2 are respectively pressed into the two focusing components through the lens pressing ring 1 and the lens pressing ring 2, and the small hole structure is pressed into one of the XY fine adjustment components through the small hole pressing ring.

3. The laser beam spatial filtering and adjusting lens according to claim 1, characterized in that: The focusing assembly includes a focusing frame, a transfer structure arranged in the focusing frame, and an adjusting knob threadedly connected to the transfer structure. A rubber ring is arranged between the adjusting knob and the focusing frame. When the adjusting knob is rotated, the transfer structure moves in a straight line in the focusing frame.

4. The laser beam spatial filtering and adjusting lens according to claim 3, characterized in that: A limiting pin is arranged on the focusing frame, and a limiting slot is correspondingly arranged on the switching structure. The limiting pin is inserted into the limiting slot and is slidably connected with the limiting slot.

5. The laser beam spatial filtering and adjusting lens according to claim 3, characterized in that: The focusing frame is provided with a mounting hole, in which a locking screw and a ball plunger are sequentially arranged from top to bottom, and an arc-shaped recess is correspondingly arranged on the adjusting knob, and the end of the ball plunger is inserted into the arc-shaped recess.

6. The laser beam spatial filtering and adjusting lens according to claim 1, characterized in that: The XY fine-tuning assembly includes a hollow main frame and an XY moving block arranged in the hollow area of ​​the main frame, four groups of XY moving block pre-tightening plungers are installed in the middle of the XY moving block, and an X-direction adjusting member and a Y-direction adjusting member are arranged between the main frame and the XY moving block.

7. The laser beam spatial filtering and adjusting lens according to claim 6, characterized in that: The X-direction adjustment member comprises an X-direction preload spring and an X-direction adjustment ball respectively arranged on both sides of the XY moving block, one end of the X-direction preload spring is fixed to the main frame, and the other end is connected to an X-direction compression spring pad, the end surface of the X-direction compression spring pad is slidably connected to the XY moving block, the two sides of the X-direction adjustment ball are respectively in contact with the main frame and the XY moving block, and the interface between the XY moving block and the X-direction adjustment ball is an inclined surface; The Y-axis adjustment member includes a Y-axis pre-tightening spring and a Y-axis adjustment ball respectively arranged on both sides of the XY moving block, one end of the Y-axis pre-tightening spring is fixed to the main frame, and the other end is connected to a Y-axis compression spring pad, the end surface of the Y-axis compression spring pad is slidably connected to the XY moving block, the two sides of the Y-axis adjustment ball are respectively in contact with the main frame and the XY moving block, and the interface between the XY moving block and the Y-axis adjustment ball is an inclined surface.

8. The laser beam spatial filtering and adjusting lens according to claim 7, characterized in that: The XY moving block is provided with two limiting slots 1 for limiting the X-direction adjusting ball and the Y-direction adjusting ball respectively, and the main frame is correspondingly provided with two limiting slots 2, the inclined surface of the XY moving block is located in the limiting slot 1, and the limiting slot 2 is a V-shaped slot.

9. The laser beam spatial filtering and adjusting lens according to claim 7, characterized in that: The inclined planes where the XY moving block contacts the X-direction adjusting ball and the Y-direction adjusting ball have the same inclination angle, and the tangent function value of the angle is 0.

1.

10. The laser beam spatial filtering and adjusting lens according to claim 8, characterized in that: The main frame is provided with two adjustment screws corresponding to the X-direction adjustment ball and the Y-direction adjustment ball, and the pitch of the adjustment screws is 0.25 mm.

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