A sealed adjustable laser beam expander lens assembly

Abstract

This application discloses a sealed adjustable laser beam expander assembly. By setting a sealing cylinder and multiple sealing rings between the adjusting lens barrel and the fixed lens barrel, and between the pressure ring and the end of the lens barrel, and by setting an installation groove with a dust cover on the side wall of the fixed lens barrel, dust, moisture and other contaminants are effectively isolated, ensuring the cleanliness of optical components, improving light transmittance and beam stability, and extending the life of the assembly. The adjusting lens barrel adopts a sliding fit and bolt locking structure, which facilitates precise axial adjustment of the lens spacing to meet different wavelengths and system requirements. The two fixing parts adopt a pressure ring, washer and annular protrusion structure to stabilize the lens and enhance the sealing effect, prevent loosening and impurities from entering, and improve the applicability and reliability of the system.

Description

Technical Field

[0001] This application relates to the field of laser beam expander technology, and more specifically to a sealed adjustable laser beam expander assembly. Background Technology

[0002] Laser beam expanders are common optical components used to extend the diameter of a laser beam and reduce its divergence angle, thereby improving the beam's collimation and propagation characteristics. In solid-state laser systems, Galilean beam expanders are often used. A typical structure includes a concave lens as the input mirror and a convex lens as the output mirror. The input mirror transmits a virtual focal length beam to the output mirror, achieving beam expansion and collimation.

[0003] However, existing laser beam expanders still have many limitations in practical applications. First, most beam expanders on the market lack effective sealing designs, making them susceptible to contaminants such as dust and moisture during operation. This contamination of the internal optical lens surfaces reduces light transmittance and affects the quality and stability of laser output. Second, existing beam expanders often use adhesive to fix the lenses to the lens barrel. Under extreme environments such as high temperature, high humidity, and strong vibration, the adhesive layer is prone to aging or failure, leading to lens loosening or even detachment, affecting the reliability and lifespan of the equipment. Furthermore, most current beam expander structures are fixed designs, unable to flexibly adjust the spacing between optical lenses according to actual application needs, limiting their adaptability to different wavelengths, focal lengths, or light source systems. Adjusting the lens spacing often requires complex mechanical structures, increasing assembly difficulty and cost. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this application is to provide a sealed adjustable laser beam expander assembly to solve the problems mentioned in the background art.

[0005] According to one aspect of this application, a sealed adjustable laser beam expander assembly includes a fixed lens barrel, an adjustable lens barrel, a first lens, a second lens, a first fixing member, and a second fixing member. An adjustable lens barrel is slidably installed within an opening at one end of the fixed lens barrel, and the outer side wall of the adjustable lens barrel slides in contact with the inner side wall of the fixed lens barrel. A first lens is detachably fixed within an opening at one end of the adjustable lens barrel via the first fixing member. A sealing member is axially fixed at an opening at the other end of the adjustable lens barrel, and the sealing member slides in sealing contact with the inner side wall of the fixed lens barrel. A fastening bolt is threaded onto the outer side wall of the adjustable lens barrel. When the adjustable lens barrel is adjusted axially within the fixed lens barrel, tightening the fastening bolt secures the adjustable lens barrel to the fixed lens barrel. A second lens is detachably fixed within an opening at the other end of the fixed lens barrel via the second fixing member.

[0006] Preferably, a strip-shaped slot is formed through the side wall of the fixed lens barrel along its axial direction. The threaded rod of the fastening bolt passes through the strip-shaped slot and is threadedly connected to the outer side wall of the adjusting lens barrel. The diameter of the nut of the fastening bolt is larger than the width of the strip-shaped slot. An installation groove is formed at the outer opening edge of the strip-shaped slot. The nut of the fastening bolt is placed in the installation groove. A dust cover is embedded in the installation groove. The dust cover can cover the fastening bolt and the strip-shaped slot.

[0007] Preferably, a first step is provided on the inner side of the opening at one end of the adjusting lens barrel, the first lens is disposed in the first step, and the first fixing member is fixedly installed on the outer end of the first step and abuts against and fixes the first lens. The sealing member includes a sealing cylinder and a first sealing ring. The sealing cylinder is fixedly disposed on the other end of the adjusting lens barrel along its axial direction. The outer wall of the sealing cylinder is in sliding contact with the inner wall of the fixing lens barrel. The inner diameter of the sealing cylinder is larger than the inner diameter of the adjusting lens barrel. The first sealing ring is embedded on the outer wall of the sealing cylinder near the second lens. The first sealing ring is in contact with the inner wall of the fixing lens barrel, and the first sealing ring is positioned away from the strip-shaped slot.

[0008] Preferably, the inner wall of the fixed lens tube is configured as a stepped structure, including a first stepped surface and a second stepped surface. The diameter of the first stepped surface is larger than the diameter of the second stepped surface. The outer wall of the adjusting lens tube is in contact with the first stepped surface, and the strip-shaped slot is connected to the first stepped surface. The outer wall of the sealing cylinder is in contact with the second stepped surface, and the first sealing ring is in contact with the second stepped surface.

[0009] Preferably, the first fixing member includes a first pressure ring and a first washer. The first washer is disposed in the first stepped portion and closely attached to the first lens. The first pressure ring has a first annular protrusion protruding from its end face facing the first lens. The outer side wall of the first annular protrusion has an external thread, and the inner side wall of the first stepped portion has an internal thread. The first annular protrusion is threadedly fixedly connected to the first stepped portion and the first annular protrusion tightly abuts against the first washer and the first lens. A second sealing ring is embedded between the first pressure ring and the end of the adjusting lens barrel.

[0010] Preferably, the other end of the fixed lens tube is expanded outward to form a flared end and has a second step portion inside, the second lens is disposed in the second step portion, and the second fixing member is fixedly installed on the outer end of the second step portion and abuts against and fixes the second lens.

[0011] Preferably, the second fixing member includes a second pressure ring and a second washer. The second washer is disposed inside the second step and closely abuts against the second lens. The second pressure ring has a second annular protrusion protruding from its end face facing the second lens. The outer side wall of the second annular protrusion has an external thread, and the inner side wall of the second step has an internal thread. The second annular protrusion is threadedly fixedly connected to the second step and the second annular protrusion tightly abuts against the second washer and the second lens. A third sealing ring is embedded between the second lens and the second step. The second pressure ring is fixedly connected to the flared end of the fixed lens barrel through a flange and by screws.

[0012] Preferably, the central axis of the adjusting lens barrel coincides with the central axis of the fixed lens barrel, the optical axis of the first lens coincides with the optical axis of the second lens, and the central axes of the adjusting lens barrel and the fixed lens barrel coincide with the optical axes of the first lens and the second lens.

[0013] The advantages of this application compared to the prior art are as follows: This application provides a sealed adjustable laser beam expander assembly. By respectively setting a sealing cylinder, a first sealing ring, a second sealing ring, and a third sealing ring between the adjusting lens barrel and the fixed lens barrel, and between the pressure ring and the end of the lens barrel, and designing a mounting groove with a dust cover at the strip-shaped slot on the side wall of the fixed lens barrel, the assembly can effectively isolate external contaminants such as dust and moisture, ensuring that the internal optical components remain clean for a long time, preventing a decrease in light transmittance, thereby stabilizing beam quality and extending the service life of the assembly; and employing a sliding-fit adjusting lens barrel design. With the fastening bolt locking structure, users only need to adjust the position of the adjusting lens barrel along the axis and tighten the bolts to achieve precise adjustment of the distance between the first and second lenses. No additional complex mechanical devices are required, which can meet the requirements of different wavelengths and different systems for beam expansion and collimation, greatly improving the applicability of the beam expander in a variety of laser systems. The first and second fixing parts adopt a pressure ring, washer and annular protrusion structure with internal and external thread engagement, which can not only firmly clamp the lens, but also the sealing ring between the pressure ring and the adjusting lens barrel and the fixing lens barrel can further prevent loosening and the entry of impurities. Attached Figure Description

[0014] Figure 1 This is a perspective view of a sealed adjustable laser beam expander assembly according to an embodiment of this application.

[0015] Figure 2 This is a cross-sectional view of a sealed adjustable laser beam expander assembly according to an embodiment of this application.

[0016] Figure 3 This is a three-dimensional exploded view of a sealed adjustable laser beam expander assembly according to an embodiment of this application.

[0017] Reference numerals in the attached drawings: 1. Fixed lens barrel; 2. Adjustable lens barrel; 3. First lens; 4. Second lens; 5. Fastening bolt; 6. Strip-shaped slot; 7. Mounting groove; 8. Dust cover; 9. First stepped portion; 10. Sealing cylinder; 11. First sealing ring; 12. First stepped surface; 13. Second stepped surface; 14. First pressure ring; 15. First gasket; 16. First annular protrusion; 17. Second sealing ring; 18. Second stepped portion; 19. Second pressure ring; 20. Second gasket; 21. Second annular protrusion; 22. Third sealing ring; 23. Flange. Detailed Implementation

[0018] To make the content of this application easier to understand, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to the accompanying drawings. Figure 2 In this context, the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. Furthermore, terms such as "first," "second," etc., are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance.

[0019] like Figures 1-3As shown, a sealed adjustable laser beam expander assembly includes a fixed lens barrel 1, an adjustable lens barrel 2, a first lens 3, a second lens 4, a first fixing member, and a second fixing member. The adjustable lens barrel 2 is slidably installed inside the opening at one end of the fixed lens barrel 1, and the outer wall of the adjustable lens barrel 2 slides in contact with the inner wall of the fixed lens barrel 1, enabling adjustable lens spacing within the assembly to meet different optical requirements for laser beam expansion. A first step 9 is formed inside the opening at one end of the adjustable lens barrel 2. The first lens 3 is disposed within the first step 9, and the first fixing member is fixedly installed at the outer end of the first step 9 and abuts against and fixes the first lens 3. Specifically, the first fixing member includes a first pressure ring 14 and a first washer 15. The first washer 15 is disposed within the first step 9 and tightly against the first lens 3, and the first pressure ring 14 faces the first lens. A first annular protrusion 16 protrudes from the end face of lens 3. An external thread is formed on the outer side wall of the first annular protrusion 16, and an internal thread is formed on the inner side wall of the first stepped portion 9. The first annular protrusion 16 is threadedly fixedly connected to the first stepped portion 9, and the first annular protrusion 16 tightly abuts against the first washer 15 and the first lens 3. A second sealing ring 17 is embedded between the first pressure ring 14 and the end of the adjusting lens barrel 2. In this design, the first lens 3 is positioned by the first stepped portion 9, and then firmly fixed by the first washer 15 and the threaded first pressure ring 14 to prevent the lens from loosening or shifting. The second sealing ring 17 between the pressure ring and the end of the adjusting lens barrel 2 provides axial sealing, making it accurately positioned, easy to install and disassemble, and having good structural stability and sealing performance. It helps to prevent dust, moisture and other impurities from entering the lens assembly and maintain long-term stable optical performance.

[0020] A sealing element is fixedly provided along its axial direction at the other end opening of the adjusting lens tube 2. The sealing element includes a sealing cylinder 10 and a first sealing ring 11. The sealing cylinder 10 is fixedly provided along its axial direction at the other end of the adjusting lens tube 2. The outer side wall of the sealing cylinder 10 is in sliding contact with the inner side wall of the fixed lens tube 1. The inner diameter of the sealing cylinder 10 is larger than the inner diameter of the adjusting lens tube 2. The first sealing ring 11 is embedded on the outer side wall of the sealing cylinder 10 near the second lens 4. The first sealing ring 11 is in contact with the inner side wall of the fixed lens tube 1, and the first sealing ring 11 is positioned away from the strip-shaped slot 6. In this design, by installing the sealing cylinder 10 at the end of the adjusting lens tube 2 and making sliding contact with the inner wall of the fixed lens tube 1, the first sealing ring 11 is tightly fitted with the fixed lens tube 1, achieving effective sealing in the adjusting state. This structure allows the adjusting cylinder to slide freely while maintaining a seal, making it particularly suitable for laser optical equipment operating in dusty, humid, or corrosive gas environments.

[0021] Furthermore, the inner wall of the fixed lens tube 1 is configured as a stepped structure, including a first stepped surface 12 and a second stepped surface 13. The diameter of the first stepped surface 12 is larger than the diameter of the second stepped surface 13. The outer wall of the adjusting lens tube 2 is in contact with the first stepped surface 12, and the strip-shaped slot 6 is connected to the first stepped surface 12. The outer wall of the sealing cylinder 10 is in contact with the second stepped surface 13, and the first sealing ring 11 is in contact with the second stepped surface 13. In this design, the adjusting lens tube 2 and the sealing cylinder 10 are respectively limited by stepped surfaces of different diameters, ensuring clear distinction between the sliding path and the sealing, making the installation positioning more accurate and the structural strength higher. At the same time, it avoids the sealing ring from aligning with the area of ​​the strip-shaped slot 6 of the fastening bolt 5, effectively improving the sealing reliability and the independence of the adjustment operation.

[0022] A slotted hole 6 is axially formed on the side wall of the fixed lens barrel 1. The threaded rod of the fastening bolt 5 passes through the slotted hole 6 and is threadedly connected to the outer side wall of the adjusting lens barrel 2. The diameter of the nut of the fastening bolt 5 is larger than the width of the slotted hole 6. A mounting groove 7 is formed at the outer edge of the slotted hole 6, and the nut of the fastening bolt 5 is placed in the mounting groove 7. When the adjusting lens barrel 2 is adjusted axially along the inside of the fixed lens barrel 1, the adjustment is achieved by tightening the fastening bolt 5. The lens barrel 2 is fixedly connected to the fixed lens barrel 1. A dust cover 8 is embedded in the mounting groove 7, which can cover the fastening bolt 5 and the strip-shaped slot 6. In this design, the axial position adjustment and locking of the lens barrel 2 is achieved through the strip-shaped slot 6 on the side wall of the fixed lens barrel 1. The nut is located in the mounting groove 7, and the dust cover 8 is used to seal the external opening, so that the lens assembly is easy to fine-tune and position, and the operation is simple. The dustproof design prevents dust and impurities from entering the adjustment mechanism, extends the service life, and enhances the overall reliability of the device.

[0023] The other end of the fixed lens barrel 1 expands outward to form a flared end, and a second step portion 18 is formed inside it. The second lens 4 is disposed within the second step portion 18, and the second fixing member is fixedly installed on the outer end of the second step portion 18 and abuts against and fixes the second lens 4. Specifically, the second fixing member includes a second pressure ring 19 and a second washer 20. The second washer 20 is disposed within the second step portion 18 and closely adheres to the second lens 4. The second pressure ring 19 has a second annular protrusion 21 protruding from its end face facing the second lens 4. The outer side wall of the second annular protrusion 21 has an external thread, and the inner side wall of the second step portion 18 has an internal thread. The second annular protrusion 21 and the second... The stepped portion 18 is threadedly fixed, and the second annular protrusion 21 tightly abuts against the second washer 20 and the second lens 4. A third sealing ring 22 is embedded between the second lens 4 and the second stepped portion 18. The second pressure ring 19 is fixedly connected to the flared end of the fixed lens barrel 1 through a flange 23 and screws. In this design, the second lens 4 is positioned by the second stepped portion 18 and the second washer 20. The second pressure ring 19 is tightened by threads and fixed by a flange 23 and screws. The third sealing ring 22 is embedded therein to enhance the sealing performance, thereby making the lens securely fixed and easy to disassemble and assemble. The flange 23 and screws provide additional reinforcement. The sealing structure is perfect, further preventing the infiltration of air, dust and moisture, and ensuring the cleanliness of the optical system.

[0024] Furthermore, the central axis of the adjusting lens tube 2 coincides with the central axis of the fixed lens tube 1, the optical axis of the first lens 3 coincides with the optical axis of the second lens 4, and the central axes of the adjusting lens tube 2 and the fixed lens tube 1 coincide with the optical axes of the first lens 3 and the second lens 4. This ensures that the axes of the adjusting lens tube 2, the fixed lens tube 1, the first lens 3, and the second lens 4 are strictly aligned, guaranteeing that the laser propagation path is without deviation, the beam is stable and consistent after beam expansion, and the imaging accuracy and system optical performance are improved.

[0025] The above embodiments are only used to illustrate the technical solutions of the embodiments of this application, and are not intended to limit them. Although the embodiments of this application have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features, without departing from the spirit and scope defined by the claims of this application.

Claims

1. A sealed adjustable laser beam expander assembly, comprising a fixed lens barrel (1), an adjustable lens barrel (2), a first lens (3), a second lens (4), a first fixing member, and a second fixing member, characterized in that, An adjusting lens tube (2) is slidably installed in the opening of one end of the fixed lens tube (1), and the outer wall of the adjusting lens tube (2) is in sliding contact with the inner wall of the fixed lens tube (1). A first lens (3) is detachably fixed in the opening of one end of the adjusting lens tube (2) by a first fixing member. A sealing member is fixed along its axial direction at the opening of the other end of the adjusting lens tube (2). The sealing member is in sliding sealing contact with the inner wall of the fixed lens tube (1). A fastening bolt (5) is threaded on the outer wall of the adjusting lens tube (2). When the adjusting lens tube (2) is adjusted along the inner axial direction of the fixed lens tube (1), the adjusting lens tube (2) is fixedly connected to the fixed lens tube (1) by tightening the fastening bolt (5). A second lens (4) is detachably fixed in the opening of the other end of the fixed lens tube (1) by a second fixing member.

2. The sealed adjustable laser beam expander assembly according to claim 1, characterized in that, A slotted hole (6) is provided through the side wall of the fixed lens tube (1) along its axial direction. The threaded rod of the fastening bolt (5) passes through the slotted hole (6) and is threadedly connected to the outer side wall of the adjusting lens tube (2). The diameter of the nut of the fastening bolt (5) is larger than the width of the slotted hole (6). An installation groove (7) is provided at the outer opening edge of the slotted hole (6). The nut of the fastening bolt (5) is placed in the installation groove (7). A dust cover (8) is embedded in the installation groove (7). The dust cover (8) can cover the fastening bolt (5) and the slotted hole (6).

3. The sealed adjustable laser beam expander assembly according to claim 2, characterized in that, The adjusting lens tube (2) has a first step (9) on the inner side of one end opening. The first lens (3) is disposed in the first step (9), and the first fixing member is fixedly installed on the outer end of the first step (9) and abuts against and fixes the first lens (3). The sealing member includes a sealing cylinder (10) and a first sealing ring (11). The other end of the adjusting lens tube (2) is fixedly provided with the sealing cylinder (10) along its axial direction. The outer side wall of the sealing cylinder (10) slides in contact with the inner side wall of the fixing lens tube (1). The inner diameter of the sealing cylinder (10) is larger than the inner diameter of the adjusting lens tube (2). The first sealing ring (11) is embedded on the outer side wall of the sealing cylinder (10) near the second lens (4). The first sealing ring (11) contacts the inner side wall of the fixing lens tube (1), and the first sealing ring (11) is set at a position away from the strip-shaped slot (6).

4. The sealed adjustable laser beam expander assembly according to claim 3, characterized in that, The inner wall of the fixed lens tube (1) is configured as a stepped structure, including a first stepped surface (12) and a second stepped surface (13). The diameter of the first stepped surface (12) is larger than the diameter of the second stepped surface (13). The outer wall of the adjusting lens tube (2) is in contact with the first stepped surface (12) and the strip-shaped slot (6) is connected to the first stepped surface (12). The outer wall of the sealing cylinder (10) is in contact with the second stepped surface (13) and the first sealing ring (11) is in contact with the second stepped surface (13).

5. A sealed adjustable laser beam expander assembly according to claim 3, characterized in that, The first fixing member includes a first pressure ring (14) and a first washer (15). The first washer (15) is disposed in the first step portion (9) and closely attached to the first lens (3). The first pressure ring (14) has a first annular protrusion (16) protruding from the end face facing the first lens (3). The outer side wall of the first annular protrusion (16) is provided with an external thread, and the inner side wall of the first step portion (9) is provided with an internal thread. The first annular protrusion (16) is threadedly fixedly connected to the first step portion (9) and the first annular protrusion (16) tightly abuts against the first washer (15) and the first lens (3). A second sealing ring (17) is embedded between the first pressure ring (14) and the end of the adjusting lens barrel (2).

6. The sealed adjustable laser beam expander assembly according to claim 1, characterized in that, The other end of the fixed lens tube (1) is expanded outward to form a flared end and a second step (18) is provided inside it. The second lens (4) is disposed in the second step (18), and the second fixing member is fixedly installed on the outer end of the second step (18) and abuts against and fixes the second lens (4).

7. A sealed adjustable laser beam expander assembly according to claim 6, characterized in that, The second fastener includes a second pressure ring (19) and a second washer (20). The second washer (20) is disposed inside the second step portion (18) and closely attached to the second lens (4). The second pressure ring (19) has a second annular protrusion (21) protruding from the end face facing the second lens (4). The outer side wall of the second annular protrusion (21) is provided with an external thread, and the inner side wall of the second step portion (18) is provided with an internal thread. The second annular protrusion (21) is threadedly fixedly connected to the second step portion (18) and the second annular protrusion (21) tightly abuts against the second washer (20) and the second lens (4). A third sealing ring (22) is embedded between the second lens (4) and the second step portion (18). The second pressure ring (19) is fixedly connected to the flared end of the fixed lens barrel (1) through a flange (23) and by screws.

8. A sealed adjustable laser beam expander assembly according to claim 1, characterized in that, The central axis of the adjusting lens tube (2) coincides with the central axis of the fixed lens tube (1), the optical axis of the first lens (3) coincides with the optical axis of the second lens (4), and the central axes of the adjusting lens tube (2) and the fixed lens tube (1) coincide with the optical axes of the first lens (3) and the second lens (4).

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