Zooming beam expanding structure system

Abstract

The invention belongs to the technical field of laser processing, and discloses a zoom beam expanding structure system, which is characterized by comprising a first optical assembly, a second optical assembly and a third optical assembly, the relative position adjustment between the first optical assembly and the second optical assembly and the relative position adjustment between the second optical assembly and the third optical assembly in the optical axis direction are achieved through threaded connection mechanisms respectively. The amplification factor of the beam expanding system can be changed through the change of the relative position between the first optical assembly and the second optical assembly, and the light beam divergence angle of the beam expanding system can be changed through the change of the relative position between the second optical assembly and the third optical assembly. Relative position adjustment is achieved through the adjustable connecting mechanism, the system structure is remarkably simplified, the manufacturing difficulty and the system cost are reduced, meanwhile, the amplification factor and the light beam divergence angle can be continuously adjusted, and the requirements of different laser processing scenes are met.

Description

Technical Field

[0001] This invention relates to the field of laser processing technology, and more specifically to a variable magnification beam expander structure system. Background Technology

[0002] With the rapid development of laser processing technology, especially in precision drilling, cutting, and welding, the requirements for laser beam quality are increasing, leading to a demand for variable magnification beam expanders that can flexibly adjust the laser beam diameter and divergence angle. Existing technologies typically use fixed-magnification beam expanders or complex multi-lens adjustment mechanisms driven by motors to adjust beam parameters. However, these methods rely on precision drive components and complex mechanical structures, resulting in high manufacturing costs, difficult assembly, and susceptibility to parameter drift under vibration. Furthermore, fixed-magnification solutions are difficult to adapt to various processing scenarios, requiring frequent equipment changes.

[0003] Therefore, the problem of how to achieve continuous variable magnification beam expansion in a simple, reliable, and low-cost manner while ensuring the stability of the optical system urgently needs to be solved in the existing technology. Summary of the Invention

[0004] The main objective of this invention is to provide a variable magnification beam expander structure system, which aims to solve the technical problem of how to achieve continuous variable magnification beam expander in a simple, reliable, and low-cost manner while ensuring the stability of the optical system.

[0005] To achieve the aforementioned objectives, the first aspect of this invention proposes a method for achieving continuous variable magnification beam expansion and ensuring the stability of an optical system in a simple, reliable, and low-cost manner, as described in the prior art. The method includes: a first optical component, a second optical component, and a third optical component; the relative positions of the first optical component and the second optical component, and the second optical component and the third optical component, are adjusted along the optical axis via threaded connection mechanisms; the relative position change between the first optical component and the second optical component can alter the magnification of the beam expansion system, and the relative position change between the second optical component and the third optical component can alter the beam divergence angle of the beam expansion system.

[0006] Furthermore, the threaded connection mechanism between the first optical component and the second optical component includes a first threaded portion disposed on the first optical component and a second threaded portion disposed on the second optical component, wherein the first threaded portion and the second threaded portion are threadedly engaged; the threaded connection mechanism between the second optical component and the third optical component includes a third threaded portion disposed on the second optical component and a fourth threaded portion disposed on the third optical component, wherein the third threaded portion and the fourth threaded portion are threadedly engaged.

[0007] Furthermore, the first threaded portion is disposed at the exit end of the first optical component, the second threaded portion is disposed at the entrance end of the second optical component; the third threaded portion is disposed at the exit end of the second optical component, and the fourth threaded portion is disposed at the entrance end of the third optical component.

[0008] Furthermore, the first optical component is able to move along the optical axis within the second optical component through the threaded engagement of the first threaded portion and the second threaded portion; the third optical component is able to move along the optical axis within the second optical component through the threaded engagement of the third threaded portion and the fourth threaded portion.

[0009] Furthermore, the first optical component, the second optical component, and the third optical component are respectively provided with a first lens, a second lens, and a third lens; the first lens, the second lens, and the third lens are respectively coaxially fixed in their respective optical components by a fixing mechanism.

[0010] Furthermore, the fixing mechanism is a pressure ring; the first lens, the second lens, and the third lens are respectively tightly attached to their respective optical components through corresponding pressure rings.

[0011] Furthermore, there is a certain distance between the first lens and the second lens, and between the second lens and the third lens.

[0012] Furthermore, it also includes a first locking mechanism and a second locking mechanism; the first locking mechanism is disposed at the connection point between the first optical component and the second optical component, and is used to fix the relative position of the first optical component and the second optical component after adjustment; the second locking mechanism is disposed at the connection point between the second optical component and the third optical component, and is used to fix the relative position of the second optical component and the third optical component after adjustment.

[0013] Furthermore, the first locking mechanism and the second locking mechanism are set screws.

[0014] Furthermore, the second optical component is provided with a magnification indication mechanism; the magnification indication mechanism includes a position mark disposed on the second optical component, the position mark being used to indicate the magnification corresponding to the adjustment position of the first optical component and the third optical component.

[0015] Beneficial effects: This technique, employing three optical components arranged sequentially along the optical axis and connected by a threaded mechanism to achieve relative position adjustment, eliminates the complex motor drive and multi-lens adjustment mechanisms of traditional solutions, significantly simplifying the system structure and reducing manufacturing costs. The magnification is changed by adjusting the relative position of the first and second optical components, and the beam divergence angle is changed by adjusting the relative position of the second and third optical components, achieving continuous variable magnification beam expansion. The threaded connection mechanism, after adjustment, naturally maintains the lens position through friction, and the locking mechanism further fixes the adjusted relative positions, effectively reducing parameter drift under vibration conditions. This ensures long-term stable operation of the optical system and solves the problems of complex structures leading to difficult and costly assembly, and the susceptibility to parameter drift under vibration affecting processing accuracy in existing technologies. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a variable-magnification beam expander system according to an embodiment of the present invention; Wherein: 10, first optical component; 11, first lens; 12, first retaining ring; 13, first threaded portion; 20, second optical component; 21, second lens; 22, second retaining ring; 23, second threaded portion; 24, third threaded portion; 30, third optical component; 31, third lens; 32, third retaining ring; 34, fourth threaded portion; 40, first locking mechanism; 50, second locking mechanism; 60, support portion; 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

[0017] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0018] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] Reference Figure 1This invention proposes a variable magnification beam expander structure system, comprising: a first optical component 10, a second optical component 20, and a third optical component 30; the relative positions of the first optical component 10 and the second optical component 20, and the second optical component 20 and the third optical component 30, are adjusted along the optical axis via threaded connection mechanisms; the change in the relative position between the first optical component 10 and the second optical component 20 can change the magnification of the beam expander system, and the change in the relative position between the second optical component 20 and the third optical component 30 can change the beam divergence angle of the beam expander system.

[0022] In this embodiment, the system is primarily applied in the field of laser processing technology, and is particularly suitable for precision machining scenarios that require flexible adjustment of the laser beam diameter and divergence angle, such as laser drilling, cutting, and welding. This system employs a precise mechanical thread fit, eliminating the need for complex drive components, thus reducing manufacturing difficulty and system cost.

[0023] Specifically, the variable-magnification beam expander system of this embodiment includes three main optical components: a first optical component 10, a second optical component 20, and a third optical component 30. These three optical components are arranged sequentially along the optical axis, forming a complete optical transmission path. The first optical component 10 is located at the front end of the system and is used to receive the laser beam emitted by the laser; the second optical component 20 is located in the middle of the system and is the core component of the entire system; the third optical component 30 is located at the rear end of the system and is used to output the adjusted laser beam. This sequential arrangement along the optical axis ensures that the laser beam passes through each optical component sequentially, achieving gradual beam adjustment, while ensuring accurate positioning and transmission of the optical elements, forming a compact structure, and reducing optical path loss.

[0024] The relative positions of the first optical component 10 and the second optical component 20, as well as the second optical component 20 and the third optical component 30, are adjusted along the optical axis via threaded connection mechanisms. This threaded connection mechanism employs a precise mechanical threaded fit structure, eliminating the complex motor drive components and multi-lens adjustment mechanisms found in traditional variable magnification beam expanders, thus significantly simplifying the system structure and reducing manufacturing difficulty and system cost. The threaded connection mechanism utilizes the principle of converting rotational motion into linear motion, enabling precise positional adjustment of the first optical component 10 and the third optical component 30 relative to the second optical component 20 along the optical axis. The threaded connection mechanism in this application effectively reduces the risk of loosening of the threaded connection under vibration or shock environments, improving the reliability of the connection.

[0025] The relative positional change between the first optical component 10 and the second optical component 20 can alter the magnification of the beam expander system. Specifically, when the first optical component 10 moves relative to the second optical component 20 along the optical axis, the optical distance between the first lens 11 disposed inside the first optical component 10 and the second lens 21 disposed inside the second optical component 20 changes, thereby causing a change in the magnification of the beam expander system. This magnification adjustment is continuously adjustable, allowing the user to precisely adjust the position of the first optical component 10 relative to the second optical component 20 according to actual processing requirements, thus obtaining the desired magnification.

[0026] The relative positional change between the second optical component 20 and the third optical component 30 can alter the beam divergence angle of the beam expanding system. Specifically, when the third optical component 30 moves relative to the second optical component 20 along the optical axis, the optical distance between the third lens 31 disposed inside the third optical component 30 and the second lens 21 disposed inside the second optical component 20 changes, thereby causing a change in the beam divergence angle of the beam expanding system. Adjusting the beam divergence angle is crucial for laser processing because different processing techniques require different divergence angles from the laser beam. By adjusting the position of the third optical component 30 relative to the second optical component 20, the variable magnification beam expanding structure system of this embodiment can precisely adjust the beam divergence angle, transforming the laser beam into a collimated state or a non-collimated state with a specific divergence angle, thereby meeting the needs of various precision processing operations.

[0027] In one embodiment, the threaded connection mechanism between the first optical component 10 and the second optical component 20 includes a first threaded portion 13 disposed on the first optical component 10 and a second threaded portion 23 disposed on the second optical component 20, wherein the first threaded portion 13 and the second threaded portion 23 are threadedly engaged; the threaded connection mechanism between the second optical component 20 and the third optical component 30 includes a third threaded portion 24 disposed on the second optical component 20 and a fourth threaded portion 34 disposed on the third optical component 30, wherein the third threaded portion 24 and the fourth threaded portion 34 are threadedly engaged.

[0028] In this embodiment, the threaded connection mechanism between the first optical component 10 and the second optical component 20 adopts a double-threaded mating structure, specifically including a first threaded portion 13 disposed on the first optical component 10 and a second threaded portion 23 disposed on the second optical component 20. The first threaded portion 13 and the second threaded portion 23 are threadedly mated, and the relative rotation of the two realizes the movement of the first optical component 10 relative to the second optical component 20 along the optical axis. The first threaded portion 13 and the second threaded portion 23 adopt a precision-machined thread structure, and the thread profile, pitch, tolerance and other parameters are strictly designed to ensure mating accuracy and transmission stability. The threaded mating mechanism can convert rotational motion into linear motion. When the first optical component 10 or the second optical component 20 is rotated, due to the threaded mating of the first threaded portion 13 and the second threaded portion 23, the first optical component 10 will move relative to the second optical component 20 along the optical axis, thereby realizing the adjustment of the distance between the first lens 11 and the second lens 21.

[0029] The threaded connection mechanism between the second optical component 20 and the third optical component 30 also adopts a double-threaded mating structure, specifically including a third threaded portion 24 disposed on the second optical component 20 and a fourth threaded portion 34 disposed on the third optical component 30. The third threaded portion 24 and the fourth threaded portion 34 are threadedly mated, and the relative rotation of the two realizes the movement of the third optical component 30 relative to the second optical component 20 along the optical axis. The design parameters of the third threaded portion 24 and the fourth threaded portion 34 are similar to those of the first threaded portion 13 and the second threaded portion 23, and they also adopt a precision-machined thread structure to ensure mating accuracy and transmission stability.

[0030] In one embodiment, the first threaded portion 13 is disposed at the exit end of the first optical component 10, the second threaded portion 23 is disposed at the incident end of the second optical component 20; the third threaded portion 24 is disposed at the exit end of the second optical component 20, and the fourth threaded portion 34 is disposed at the incident end of the third optical component 30.

[0031] In this embodiment, a first threaded portion 13 is disposed at the exit end of the first optical component 10, and a second threaded portion 23 is disposed at the incident end of the second optical component 20. The exit end refers to the laser beam output end of the first optical component 10, and the incident end refers to the laser beam input end of the second optical component 20. The first threaded portion 13 and the second threaded portion 23 are respectively disposed at the ends of the corresponding components, facilitating assembly and adjustment. Specifically, the exit end of the first optical component 10 can be designed with an external thread structure, and the first threaded portion 13 is such an external thread; the incident end of the second optical component 20 can be designed with an internal thread structure, and the second threaded portion 23 is such an internal thread. By designing the first threaded portion 13 as an external thread and the second threaded portion 23 as an internal thread, the first optical component 10 can be screwed into the second optical component 20, forming a stable mating structure.

[0032] The third threaded portion 24 is disposed at the exit end of the second optical component 20, and the fourth threaded portion 34 is disposed at the entrance end of the third optical component 30. Similar to the design of the first threaded portion 13 and the second threaded portion 23, the exit end of the second optical component 20 can be designed as an external thread structure, and the third threaded portion 24 is such an external thread; the entrance end of the third optical component 30 can be designed as an internal thread structure, and the fourth threaded portion 34 is such an internal thread. By designing the third threaded portion 24 as an external thread and the fourth threaded portion 34 as an internal thread, the third optical component 30 can be screwed into the second optical component 20 to form a stable mating structure.

[0033] The design of placing the threaded portions at the output or input ends of corresponding components makes the entire variable magnification beam expander system more compact and the optical path more stable. The laser beam is output from the output end of the first optical component 10, passes through the mating area of ​​the first threaded portion 13 and the second threaded portion 23, enters the input end of the second optical component 20, and then exits from the output end of the second optical component 20, passes through the mating area of ​​the third threaded portion 24 and the fourth threaded portion 34, and enters the input end of the third optical component 30. This design minimizes the transmission path of the laser beam, reduces optical path loss and aberrations, and improves the performance of the optical system.

[0034] In one embodiment, the first optical component 10 is movable within the second optical component 20 along the optical axis direction through the threaded engagement of the first threaded portion 13 and the second threaded portion 23; the third optical component 30 is movable within the second optical component 20 along the optical axis direction through the threaded engagement of the third threaded portion 24 and the fourth threaded portion 34.

[0035] In this embodiment, the first optical component 10 can move along the optical axis within the second optical component 20 through the threaded engagement of the first threaded portion 13 and the second threaded portion 23. Specifically, the second optical component 20 is designed as a hollow cylindrical structure, and the first optical component 10 is designed to be inserted into the second optical component 20. The first threaded portion 13 is disposed on the outer surface of the first optical component 10, and the second threaded portion 23 is disposed on the inner surface of the second optical component 20. When the first optical component 10 is inserted into the second optical component 20, the first threaded portion 13 and the second threaded portion 23 form a threaded engagement. By rotating the first optical component 10, due to the threaded engagement, the first optical component 10 can move back and forth along the optical axis within the second optical component 20.

[0036] The third optical component 30, through the threaded engagement of the third threaded portion 24 and the fourth threaded portion 34, can also move along the optical axis within the second optical component 20. The third optical component 30 is also designed to be inserted into the second optical component 20. The third threaded portion 34 is located on the outer surface of the third optical component 30, and the third threaded portion 24 is located on the inner surface of the second optical component 20. When the third optical component 30 is inserted into the second optical component 20, the third threaded portion 34 and the third threaded portion 24 form a threaded engagement. By rotating the third optical component 30, due to the threaded engagement, the third optical component 30 can move back and forth along the optical axis within the second optical component 20.

[0037] The design allowing the first optical component 10 and the third optical component 30 to move within the second optical component 20 results in a compact structure and excellent coaxiality for the entire variable magnification beam expander system. Since both the first optical component 10 and the third optical component 30 move within the second optical component 20, the second optical component 20 acts as a guide and limiter, ensuring coaxiality during their movement and preventing aberrations and optical path deviations caused by eccentricity or tilt. Simultaneously, this design results in a shorter overall system length, facilitating installation and use.

[0038] In one embodiment, the first optical component 10, the second optical component 20, and the third optical component 30 are respectively provided with a first lens 11, a second lens 21, and a third lens 31; the first lens 11, the second lens 21, and the third lens 31 are respectively coaxially fixed in their respective optical components by a fixing mechanism.

[0039] In this embodiment, the first optical component 10 contains a first lens 11, the second optical component 20 contains a second lens 21, and the third optical component 30 contains a third lens 31. These three lenses are the core optical elements of the variable magnification beam expander system, and their coordinated operation enables the beam expansion, collimation, and divergence angle adjustment functions of the laser beam. The optical parameters and material selection of the first lens 11, the second lens 21, and the third lens 31 are determined according to the actual application requirements, and must meet the requirements of laser power, wavelength, beam expansion ratio, and divergence angle adjustment range.

[0040] The first lens 11 is the front lens group of the beam expander, responsible for initial focusing and aberration correction of the optical path. The second lens 21 is a key component of the optical system, typically working in conjunction with the first lens 11, primarily used to change the magnification of the beam expander. The third lens 31 is the rear lens group, mainly used to change the divergence angle of the beam expander, working in conjunction with the first lens 11 and the second lens 21 to ensure the performance and stability of the entire optical system. Simultaneously, the first lens 11, the second lens 21, and the third lens 31 all possess high damage thresholds and transmittance, maintaining the stability of the beam output power.

[0041] The first lens 11, the second lens 21, and the third lens 31 are coaxially fixed within their respective optical components by fixing mechanisms. The function of the fixing mechanisms is to precisely secure the lenses within the optical components, ensuring that the optical axis of the lens coincides with the mechanical axis of the optical component, thereby guaranteeing the correct transmission and adjustment of the laser beam. The fixing mechanisms need to have good positioning accuracy and stability to prevent the lenses from becoming eccentric, tilted, or loose during installation and use, which could affect their optical performance.

[0042] In one embodiment, the fixing mechanism is a pressure ring; the first lens 11, the second lens 21 and the third lens 31 are respectively tightly attached to their respective optical components through the corresponding pressure rings.

[0043] In this embodiment, the fixing mechanism specifically adopts a clamping ring structure. A first clamping ring 12 is provided within the first optical component 10, which coaxially fixes the first lens 11 within the first optical component 10; a second clamping ring 22 is provided within the second optical component 20, which coaxially fixes the second lens 21 within the second optical component 20; a third clamping ring 32 is provided within the third optical component 30, which coaxially fixes the third lens 31 within the third optical component 30. The first clamping ring 12, the second clamping ring 22, and the third clamping ring 32 have similar structures and functions, all fixing the corresponding lenses within the optical components by clamping.

[0044] The first retaining ring 12 and the first lens 11 are coaxially arranged within the first optical assembly 10, which can eliminate errors caused by lens eccentricity and other reasons. The tight fit between the first retaining ring 12 and the first lens 11 can effectively maintain its stability and prevent the lens from shifting due to movement or other factors during the operation of the beam expander. The first retaining ring 12 is usually made of a material with good plasticity that can be extruded into various complex cross-sections, such as aluminum. It can fit tightly with the lens to ensure the accuracy and stability of the optical path.

[0045] The second retaining ring 22 is located inside the second optical component 20, and the second retaining ring 22 coaxially fixes the second lens 21 inside the second optical component 20. The function of the second retaining ring 22 is similar to that of the first retaining ring 12, which makes it fit tightly against the lens and maintain its stability. This can greatly improve the stability and shock resistance of the beam expander and effectively avoid optical path errors caused by vibration and other factors.

[0046] The third retaining ring 32 is located inside the third optical component 30, and it coaxially fixes the third lens 31 inside the third optical component 30. The third retaining ring 32 has a similar function to the first retaining ring 12 and the second retaining ring 22, making it fit tightly against the lens and maintaining its stability. This can greatly improve the stability and shock resistance of the beam expander, and effectively avoid optical path errors caused by vibration and other factors.

[0047] The advantages of the pressure ring structure lie in its simple structure, high reliability, and ease of assembly and disassembly. The pressure ring secures the lens by pressing against its edge or side, eliminating the need for complex mechanical structures or adhesives, thus reducing manufacturing difficulty and cost.

[0048] In one embodiment, there is a certain distance between the first lens 11 and the second lens 21, and between the second lens 21 and the third lens 31.

[0049] In this embodiment, there is a certain distance between the first lens 11 and the second lens 21, and there is also a certain distance between the second lens 21 and the third lens 31. This distance is key to the variable magnification beam expander system achieving variable magnification and divergence angle adjustment. By adjusting these distances, the magnification and beam divergence angle can be continuously adjusted. The air gap between the first lens 11, the second lens 21, and the third lens 31 provides better spherical aberration and chromatic aberration correction, as well as higher laser damage resistance. The air gap prevents the adhesive from aging, discoloring, or being damaged under laser irradiation, thereby enhancing the service life of the beam expander and ensuring its long-term stable operation.

[0050] In one embodiment, the system further includes a first locking mechanism 40 and a second locking mechanism 50; the first locking mechanism 40 is disposed at the connection between the first optical component 10 and the second optical component 20, and is used to fix the relative position of the first optical component 10 and the second optical component 20 after adjustment; the second locking mechanism 50 is disposed at the connection between the second optical component 20 and the third optical component 30, and is used to fix the relative position of the second optical component 20 and the third optical component 30 after adjustment.

[0051] In this embodiment, the variable magnification beam expander structure system further includes a first locking mechanism 40 and a second locking mechanism 50. The function of the first locking mechanism 40 and the second locking mechanism 50 is to fix the relative positions of the first optical component 10 and the second optical component 20, and the second optical component 20 and the third optical component 30, after they are adjusted to the target positions, to prevent accidental position movement due to vibration or impact during use, thereby ensuring the stability and reliability of the optical system.

[0052] The first locking mechanism 40 is disposed at the connection between the first optical component 10 and the second optical component 20, and is used to fix the relative position of the first optical component 10 and the second optical component 20 after adjustment. The first locking mechanism 40 is located near the threaded mating area of ​​the first threaded portion 13 and the second threaded portion 23, and can effectively lock the relative position of the first threaded portion 13 and the second threaded portion 23, preventing relative rotation or movement between them. When the first optical component 10 is adjusted to the target position relative to the second optical component 20, the first locking mechanism 40 is operated to tighten it, so that the locking component of the first locking mechanism 40 presses against the threaded mating surface of the first threaded portion 13 and the second threaded portion 23 or prevents relative rotation between them, thereby achieving position locking.

[0053] The second locking mechanism 50 is disposed at the connection between the second optical component 20 and the third optical component 30, and is used to fix the relative position of the second optical component 20 and the third optical component 30 after adjustment. The second locking mechanism 50 is located near the threaded mating area of ​​the third threaded portion 24 and the fourth threaded portion 34, and can effectively lock the relative position of the third threaded portion 24 and the fourth threaded portion 34, preventing relative rotation or movement. When the third optical component 30 is adjusted to the target position relative to the second optical component 20, the second locking mechanism 50 is operated to tighten it, causing the locking component of the second locking mechanism 50 to press against the threaded mating surfaces of the third threaded portion 24 and the fourth threaded portion 34 or prevent relative rotation, thereby achieving position locking.

[0054] The threaded fit between the beam expander components reduces manufacturing difficulty and system cost, resulting in a shorter overall mechanical length of the beam expander. Magnification adjustment can be completed by manually rotating the threads, enabling continuous magnification changes. However, while the threaded fit has self-locking properties under no external force, it can still loosen under vibration or impact. The presence of the first locking mechanism 40 and the second locking mechanism 50 provides additional locking force on top of the threaded fit, ensuring that the adjusted position will not change unexpectedly under vibration or impact, thus guaranteeing the long-term stable operation of the optical system.

[0055] In one embodiment, the first locking mechanism 40 and the second locking mechanism 50 are set screws.

[0056] In this embodiment, the first locking mechanism 40 and the second locking mechanism 50 specifically adopt a set screw structure. The first locking mechanism 40 is a set screw, which is located at the connection between the first optical component 10 and the second optical component 20. A locking threaded hole is provided near the threaded mating area of ​​the first optical component 10 and the second optical component 20. After the set screw is screwed into the locking threaded hole, its end presses against the threaded mating surface of the first threaded part 13 and the second threaded part 23, or abuts into the groove of the first threaded part 13 or the second threaded part 23, preventing relative rotation or movement between the two, thereby locking the relative position of the first optical component 10 and the second optical component 20.

[0057] The second locking mechanism 50 is a set screw, located at the connection between the second optical component 20 and the third optical component 30. A locking threaded hole is provided near the threaded mating area of ​​the second optical component 20 and the third optical component 30. After the set screw is screwed into the locking threaded hole, its end presses against the threaded mating surfaces of the third threaded portion 24 and the fourth threaded portion 34, or abuts into the groove of the third threaded portion 24 or the fourth threaded portion 34, preventing relative rotation or movement between the two components and thus locking the relative position of the second optical component 20 and the third optical component 30.

[0058] In one embodiment, the second optical component 20 is provided with a magnification indicator mechanism; the magnification indicator mechanism includes a position mark disposed on the second optical component 20, the position mark being used to indicate the magnification corresponding to the adjustment position of the first optical component 10 and the third optical component 30.

[0059] In this embodiment, the second optical component 20 is provided with a magnification indicator mechanism for indicating the magnification corresponding to the adjustment positions of the first optical component 10 and the third optical component 30. The magnification indicator mechanism includes a position marker disposed on the second optical component 20. The position marker can be a scale line, a number, a color, a symbol, or other suitable marking form. In this embodiment, the position marker adopts a combination of scale lines and numbers.

[0060] The second optical component 20 has position markings corresponding to various magnifications engraved on its incident end and its exit end. These position markings correspond to the adjustment positions of the first optical component 10 and the third optical component 30, respectively. When the first optical component 10 is adjusted to a certain position, its reference line or reference mark aligns with a position marking on the incident end of the second optical component 20; the magnification corresponding to this position marking is the current magnification. Similarly, when the third optical component 30 is adjusted to a certain position, its reference line or reference mark aligns with a position marking on the exit end of the second optical component 20; the magnification corresponding to this position marking is the current beam divergence angle.

[0061] In one embodiment, the second optical component 20 is provided with a support portion 60; the support portion 60 is used to fix it on the adjustable frame to ensure that the frame clamping portion is stable.

[0062] In this embodiment, the second optical component 20 is provided with a support portion 60, which has a maximum outer diameter of 37.6 mm and a width of 15 mm. The support portion 60 is used to stably fix the beam expander on the adjustment frame. If the support portion 60 is too narrow, it will cause the beam expander to be placed unevenly, and the diameter accuracy and stability of the laser beam cannot be guaranteed. The support portion 60 can ensure the stability of the frame clamping part, and can guarantee the stability, reliability and long-term normal operation of the beam expander device.

[0063] In the above embodiment, the incident end of the second optical component 20 is engraved with position marks corresponding to each magnification, and the exit end is engraved with position marks and distance marks corresponding to each magnification. When the incident end is adjusted to a certain magnification, the corresponding exit end is also adjusted accordingly. During adjustment, it is only necessary to align the marks at both ends and then make fine adjustments to quickly match the target magnification. When the laser is incident, when the incident end and the exit end are rotated to match the corresponding position marks, a collimated and expanded beam at the corresponding magnification can be obtained.

[0064] 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 or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A variable-magnification beam expander structure system, characterized in that, include: The system comprises a first optical component, a second optical component, and a third optical component. The relative positions of the first optical component and the second optical component, as well as the second optical component and the third optical component, are adjusted along the optical axis via threaded connection mechanisms. The relative position change between the first optical component and the second optical component can alter the magnification of the beam expander system, and the relative position change between the second optical component and the third optical component can alter the beam divergence angle of the beam expander system.

2. The variable-magnification beam expander structure system according to claim 1, characterized in that, The threaded connection mechanism between the first optical component and the second optical component includes a first threaded portion disposed on the first optical component and a second threaded portion disposed on the second optical component, wherein the first threaded portion and the second threaded portion are threadedly engaged; the threaded connection mechanism between the second optical component and the third optical component includes a third threaded portion disposed on the second optical component and a fourth threaded portion disposed on the third optical component, wherein the third threaded portion and the fourth threaded portion are threadedly engaged.

3. The variable-magnification beam expander structure system according to claim 2, characterized in that, The first threaded portion is disposed at the exit end of the first optical component, the second threaded portion is disposed at the entrance end of the second optical component; the third threaded portion is disposed at the exit end of the second optical component, and the fourth threaded portion is disposed at the entrance end of the third optical component.

4. The variable-magnification beam expander structure system according to claim 2, characterized in that, The first optical component is able to move along the optical axis within the second optical component through the threaded engagement of the first threaded portion and the second threaded portion; the third optical component is able to move along the optical axis within the second optical component through the threaded engagement of the third threaded portion and the fourth threaded portion.

5. The variable-magnification beam expander structure system according to claim 1, characterized in that, The first optical component, the second optical component, and the third optical component are respectively provided with a first lens, a second lens, and a third lens; the first lens, the second lens, and the third lens are respectively coaxially fixed in their respective optical components by a fixing mechanism.

6. The variable-magnification beam expander structure system according to claim 5, characterized in that, The fixing mechanism is a pressure ring; the first lens, the second lens and the third lens are respectively tightly attached to their respective optical components through the corresponding pressure rings.

7. The variable-magnification beam expander structure system according to claim 5, characterized in that, There is a certain distance between the first lens and the second lens, and between the second lens and the third lens.

8. The variable-magnification beam expander structure system according to claim 1, characterized in that, It also includes a first locking mechanism and a second locking mechanism; the first locking mechanism is disposed at the connection between the first optical component and the second optical component, and is used to fix the relative position of the first optical component and the second optical component after adjustment; the second locking mechanism is disposed at the connection between the second optical component and the third optical component, and is used to fix the relative position of the second optical component and the third optical component after adjustment.

9. The variable-magnification beam expander structure system according to claim 8, characterized in that, The first locking mechanism and the second locking mechanism are set screws.

10. The variable-magnification beam expander structure system according to claim 1, characterized in that, The second optical component is provided with a magnification indicator mechanism; the magnification indicator mechanism includes a position mark disposed on the second optical component, the position mark being used to indicate the magnification corresponding to the adjustment position of the first optical component and the third optical component.

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