Homogenizing lens module

Abstract

The invention discloses a homogenizing lens module, and belongs to the technical field of laser processing, the homogenizing lens module comprises a mounting shell, an adjusting mechanism and a micro lens array, a first lens seat, a second lens seat and a third lens seat are arranged in the mounting shell, a first rotating sleeve is rotatably arranged in the first lens seat, and a second rotating sleeve is rotatably arranged in the third lens seat; the adjusting mechanism comprises a first linear adjusting assembly used for driving the second lens base to move axially and a second linear adjusting assembly used for driving the third lens base to move axially. The micro lens array comprises a first lens, a second lens, a third lens and a fourth lens, the first lens is fixed in the first rotating sleeve, the second lens and the third lens are fixed in the second lens base, and the fourth lens is fixed in the second rotating sleeve. The first lens and the fourth lens can be rotationally adjusted by 360 degrees, the second lens, the third lens and the fourth lens can move in the axial direction, double adjustment of rotation and movement is achieved, light spot uniformity and energy density distribution are optimized, and machining quality is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of laser processing, and particularly to a homogenizing lens module. Background Art

[0002] Laser homogenization technology has important application values in industrial processing, medical equipment and scientific research fields. Its core lies in converting a multi-mode laser beam into a uniform intensity distribution through an optical module. The homogenizing lens module mainly adopts an integrated design of a quartz refractive microlens array and a focusing lens. The incident laser is segmented into multiple channels and phase-modulated by the microlenses distributed in an array, and then the beam superposition and fusion are realized through the focusing lens. The microlens array is an array composed of lenses with a micron-level clear aperture and relief depth. It not only has the basic functions of traditional lenses such as focusing and imaging, but also has the characteristics of small unit size and high integration degree, enabling it to complete functions that traditional optical elements cannot complete and constituting many new optical systems, showing unique advantages when dealing with high-power multi-mode laser light sources.

[0003] However, the adjustment method of the current homogenizing module generally adopts a single-degree-of-freedom mechanical structure, that is, it only supports axial displacement adjustment or single-dimensional rotation adjustment. This rigid adjustment mode severely limits the adaptability of the module to changes in laser beam parameters: when the output mode of the laser changes or the processing object is switched, the operator cannot dynamically optimize the spot uniformity and energy density distribution through multi-dimensional coordinated adjustment, directly affecting the processing quality. Therefore, developing a homogenizing lens module with multi-degree-of-freedom coordinated adjustment ability has become a key research direction to break through the bottleneck of laser precision processing technology. Summary of the Invention

[0004] The purpose of the present invention is to solve the above technical problems and provide a homogenizing lens module, in which the first lens and the fourth lens can be respectively adjusted by 360° rotation, and the second lens, the third lens and the fourth lens can move along the axial direction of the optical path channel, realizing a dual adjustment method of rotation and movement of the microlens array, and capable of converting a circular collimated beam with a Gaussian profile into a rectangular output spot with a flat-top intensity distribution, so as to dynamically optimize the spot uniformity and energy density distribution and ensure the processing quality.

[0005] To achieve the above purpose, the present invention provides the following solution: The present invention discloses a homogenizing lens module, comprising:

[0006] An installation housing is provided. An optical path channel is arranged inside the installation housing. A first lens holder, a second lens holder, and a third lens holder are successively arranged in the optical path channel from one end to the other end. The first lens holder is fixedly connected to the optical path channel. The installation cavities of the first lens holder, the second lens holder, and the third lens holder are coaxially arranged. A first rotating sleeve is coaxially and rotatably connected inside the installation cavity of the first lens holder. A second rotating sleeve is coaxially and rotatably connected inside the installation cavity of the third lens holder.

[0007] An adjusting mechanism, the adjusting mechanism includes a first linear adjusting component and a second linear adjusting component. The first linear adjusting component is used to drive the second lens holder to move along the axial direction of the optical path channel. The second linear adjusting component is used to drive the third lens holder to move along the axial direction of the optical path channel.

[0008] And a microlens array, the microlens array includes a first lens, a second lens, a third lens, and a fourth lens. The first lens is coaxially and fixedly connected inside the first rotating sleeve. The second lens and the third lens are coaxially and fixedly connected with a spacing inside the installation cavity of the second lens holder. The second lens is located between the first lens and the third lens. The fourth lens is coaxially and fixedly connected inside the second rotating sleeve.

[0009] In one embodiment, the polarization coating directions of the second lens and the third lens are perpendicular to each other.

[0010] In one embodiment, both the first linear adjusting component and the second linear adjusting component include an optical axis and a lead screw. The optical axis is installed inside the optical path channel. A linear bearing is sleeved on the optical axis. The lead screw is rotatably connected inside the optical path channel. A handwheel is coaxially and fixedly connected to the lead screw. An adjusting opening for the handwheel to expose is provided on the installation housing. A threaded sleeve is threadedly connected to the lead screw. The axial directions of the optical axis and the lead screw are both parallel to the axial direction of the optical path channel. The threaded sleeve and the linear bearing of the first linear adjusting component are both fixedly connected to the second lens holder. The threaded sleeve and the linear bearing of the second linear adjusting component are both fixedly connected to the third lens holder.

[0011] In one embodiment, the installation housing includes a cylinder body and an end cover. The end cover is installed on one end opening of the cylinder body. The end cover and the first lens holder are integrally formed. An installation opening serving as the installation cavity of the first lens is provided on the end cover. The second lens holder and the third lens holder are both located inside the cylinder body.

[0012] In one embodiment, an installation ring is provided at one end of the cylinder body away from the end cover. Corresponding optical axis installation grooves are provided on the end cover and the installation ring, and both ends of the optical axis are respectively embedded in the optical axis installation groove of the end cover and the optical axis installation groove on the installation ring. First screws are threadedly connected to both the end cover and the cylinder body, and the first screws can press the optical axis tightly in the optical axis installation groove. A bearing installation groove is further provided on the end cover, and a lead screw installation groove is further provided on the cylinder body. The lead screw installation groove includes a first groove section and a second groove section. Rotating bearings are installed at both ends of the lead screw. The rotating bearing at one end of the lead screw is embedded in the bearing installation groove, and the other end of the lead screw is embedded in the second groove section. The rotating bearing on the end of the lead screw embedded in the second groove section is embedded in the first groove section. A second screw is further threadedly connected to the cylinder body, and the second screw presses the end of the lead screw tightly in the second groove section. A third screw is further threadedly connected to the end cover, and the third screw is used to press the rotating bearing tightly in the bearing installation groove.

[0013] In one embodiment, a first strip-shaped opening is provided on the cylinder body. The first strip-shaped opening extends along the axial direction of the cylinder body. The projections of the second lens holder and the third lens holder on the inner wall of the cylinder body are located on the extension path of the first strip-shaped opening. A first scale line is provided at the first strip-shaped opening, and the first scale line is arranged along the axial direction of the cylinder body.

[0014] In one embodiment, an adjustment hole is provided on the end cover, and a fourth screw that can press the first rotating sleeve is threadedly connected in the adjustment hole. A second strip-shaped opening is further provided on the cylinder body. The second strip-shaped opening extends along the axial direction of the cylinder body. A fifth screw that can press the second rotating sleeve is provided on the third lens holder, and the projection of the fifth screw on the inner wall of the cylinder body is located on the extension path of the second strip-shaped opening.

[0015] In one embodiment, a first snap ring and a first convex ring for clamping the first lens are installed in the first rotating sleeve. A second snap ring and a second convex ring for clamping the first lens are installed in the second rotating sleeve. A third snap ring is installed on the installation ring.

[0016] In one embodiment, a second scale line is provided on the end of the end cover away from the cylinder body. The second scale line is arranged circumferentially along the installation opening. A first indicating mark is provided on the first rotating sleeve, and the first indicating mark corresponds to the second scale line. A third scale line is provided on the end face of the third lens holder facing the installation ring. The third scale line is arranged circumferentially along the second rotating sleeve. A second indicating mark is provided on the second rotating sleeve, and the second indicating mark corresponds to the third scale line.

[0017] In one embodiment, the first rotating sleeve and the second rotating sleeve are both provided with shifting slots on their end surfaces that are away from each other.

[0018] Compared with the prior art, the present invention has achieved the following technical effects:

[0019] In the present invention, under the action of the first rotating sleeve and the second rotating sleeve, the first lens and the fourth lens can be respectively rotated and adjusted by 360°, and under the action of the second lens holder, the third lens holder and the adjustment mechanism, the second lens, the third lens and the fourth lens can be moved along the axial direction of the optical path channel, thereby realizing a dual adjustment mode of rotation and movement of the microlens array, and being able to transform a circular collimated light beam with a Gaussian profile into a module of a rectangular output light spot with a flat-top intensity distribution, so as to dynamically optimize the light spot uniformity and energy density distribution, and ensure the processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the analysis of these drawings without paying creative work.

[0021] Figure 1 is a rear-view stereoscopic structural schematic diagram of a homogenizing lens module in an embodiment of the present invention;

[0022] Figure 2 Schematic diagram of the front-view stereoscopic structure of the homogenizing lens module in an embodiment of the present invention;

[0023] Figure 3 is a schematic cross-sectional structural diagram of a homogenizing lens module in an embodiment of the present invention;

[0024] Figure 4 Schematic diagram of the rear view structure of the homogenizing lens module in an embodiment of the present invention;

[0025] Figure 5 Schematic diagram of the front structure of the homogenizing lens module in an embodiment of the present invention;

[0026] Figure 6 is a rear perspective structural schematic diagram of an end cover in an embodiment of the present invention;

[0027] Figure 7 is a front perspective structural diagram of an end cap in an embodiment of the present invention;

[0028] Figure 8 Schematic diagram of the rear-view stereoscopic structure of the homogenizing lens module (without end caps) in an embodiment of the present invention;

[0029] Figure 9 It is a schematic diagram of the three-dimensional structure of the first straight line adjustment component and the second straight line adjustment component in the embodiment of the present invention;

[0030] Figure 10 is a schematic diagram of a three-dimensional structure of the connection relationship between the third lens holder and the fourth lens in an embodiment of the present invention;

[0031] Figure 11 is a three-dimensional structural schematic diagram of the connection relationship between the first rotating cylinder and the first lens in an embodiment of the present invention;

[0032] Figure 12 is a schematic structural diagram of a microlens array before it moves in an embodiment of the present invention;

[0033] Figure 13 is a schematic diagram of the structure of the microlens array after the fourth lens is moved in the embodiment of the present invention;

[0034] Figure 14 Schematic diagram of the structure of the microlens array after the second lens and the third lens are moved in an embodiment of the present invention.

[0035] Description of reference numerals: 1, barrel; 2, end cover; 3, second lens holder; 4, third lens holder; 5, first rotating sleeve; 6, second rotating sleeve; 7, first lens; 8, second lens; 9, third lens; 10, fourth lens; 11, bolt; 12, optical axis; 13, lead screw; 14, hand wheel; 15, linear bearing; 16, threaded sleeve; 17, rotating bearing; 18, mounting port; 19, adjustment hole; 20, adjustment port; 21, toggle slot; 22. First strip opening; 23. Second strip opening; 24. First scale line; 25. Second scale line; 26. Third scale line; 27. First retaining ring; 28. Second retaining ring; 29. ​​Third retaining ring; 30. First screw; 31. Second screw; 32. Third screw; 33. Fourth screw; 34. Fifth screw; 35. First convex ring; 36. Second convex ring; 37. Mounting ring; 38. First indicator line; 39. Second indicator line. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments analyzed and obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] The object of the present invention is to provide a homogenizing lens module to solve the problems existing in the prior art. In this homogenizing lens module, the first lens and the fourth lens can rotate 360° respectively, and the second lens, the third lens and the fourth lens can move along the axial direction of the optical path channel, thus realizing the dual adjustment methods of rotation and movement of the microlens array, and being able to change a circular collimated beam with a Gaussian profile into a rectangular output light spot with a flat-top intensity distribution, so as to dynamically optimize the light spot uniformity and energy density distribution, ensure the processing quality. Moreover, the adjustment method of this homogenizing lens module is simple, there are few parts with structural cooperation and movement, high precision, and it can be compatible with more complex optical systems.

[0038] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0039] As Figures 1 to 14 shown:

[0040] This embodiment provides a homogenizing lens module, including a mounting housing, an adjustment mechanism and a microlens array. Among them:

[0041] An optical path channel is provided in the mounting housing, and a first lens seat, a second lens seat 3 and a third lens seat 4 are sequentially arranged in the optical path channel from one end to the other end. The first lens seat is fixedly connected to the optical path channel, and the mounting cavities of the first lens seat, the second lens seat 3 and the third lens seat 4 are coaxially arranged. A first rotating sleeve 5 is coaxially and rotatably connected in the mounting cavity of the first lens seat. A second rotating sleeve 6 is coaxially and rotatably connected in the mounting cavity of the third lens seat.

[0042] The adjustment mechanism includes a first linear adjustment component and a first linear adjustment component. The first linear adjustment component is used to drive the second lens seat 3 to move along the axial direction of the optical path channel. The second linear adjustment component is used to drive the third lens seat 4 to move along the axial direction of the optical path channel.

[0043] The microlens array includes a first lens 7, a second lens 8, a third lens 9 and a fourth lens 10. The first lens 7 is coaxially and fixedly connected in the first rotating sleeve 5. The second lens 8 and the third lens 9 are fixedly connected at a fixed distance in the mounting cavity of the second lens seat 3. The second lens 8 and the third lens 9 are both coaxially arranged with the mounting cavity of the second lens seat 3, and the second lens 8 is located between the first lens 7 and the third lens 9. The fourth lens 10 is coaxially and fixedly connected in the second rotating sleeve 6.

[0044] Working principle:

[0045] By rotating the first rotating sleeve 5, the rotation of the first lens 7 can be realized;

[0046] By rotating the second rotating sleeve 6, the rotation of the fourth lens 10 can be realized;

[0047] The second lens holder 3 can be driven to move axially along the optical path channel by the first linear adjustment component, so as to realize the forward and backward movement of the second lens 8 and the third lens 9 along the optical axis of the optical path channel;

[0048] The third lens holder 4 can be driven to move axially along the optical path channel by the second linear adjustment component, so as to realize the forward and backward movement of the fourth lens 10 along the optical axis of the optical path channel.

[0049] In this homogenizing lens module, the first lens 7 and the fourth lens 10 can rotate 360° respectively. At the same time, the fourth lens 10 can move relative to the first lens 7, the second lens 8 and the third lens 9, and the second lens 8 and the third lens 9 can also move relative to the first lens 7 and the fourth lens 10. Thus, a double adjustment method of rotation and movement of the microlens array is realized. Under the coordinated adjustment of the double adjustment method, a module that can change a circular collimated beam with a Gaussian profile into a rectangular output light spot with a flat-top intensity distribution can be obtained, so as to dynamically optimize the light spot uniformity and energy density distribution and ensure the processing quality.

[0050] In one embodiment, the polarization directions of the polarization coating of the second lens 8 and the polarization coating of the third lens 9 are perpendicular to each other.

[0051] In one embodiment, the distance between the second lens 8 and the third lens 9 can be preset as needed, and usually this distance is 1 mm.

[0052] In one embodiment, both the first linear adjustment assembly and the second linear adjustment assembly include an optical axis 12 and a lead screw 13. The optical axis 12 is installed in the optical path channel, and a linear bearing 15 is sleeved on the optical axis 12. The lead screw 13 is rotatably connected in the optical path channel, and a handwheel 14 is coaxially and fixedly connected to the lead screw 13. An adjustment port 20 for the handwheel 14 to expose is provided on the installation housing. A threaded sleeve 16 is threadedly connected to the lead screw 13. The axial directions of both the optical axis 12 and the lead screw 13 are parallel to the axial direction of the optical path channel. The threaded sleeve 16 and the linear bearing 15 of the first linear adjustment assembly are both fixedly connected to the second lens holder 3. The threaded sleeve 16 and the linear bearing 15 of the second linear adjustment assembly are both fixedly connected to the third lens holder 4. By rotating the handwheel 14, the lead screw 13 is driven to rotate. Under the guidance of the optical axis 12 and the linear bearing 15, the threaded sleeve 16 can be converted into a movement in the axial direction of the lead screw 13, thereby driving the second lens holder 3 or the third lens holder 4 to move along the axial direction of the optical path channel. The above is a manual adjustment method. If the handwheel 14 is replaced with a mechanical drive device to drive the lead screw 13 to rotate, the second lens holder 3 or the third lens holder 4 can also be automatically moved. For example, if the handwheel 14 is replaced with a drive motor, the drive motor is connected to the lead screw 13 through a reducer. Control buttons are provided on the installation housing to control the opening and closing of the drive motor, or movement parameters are input on a display screen, etc., to achieve automatic adjustment of the second lens holder 3 or the third lens holder 4. In addition, the above is only a preferred movement method, and other movement methods can also be set according to needs. For example, the lead screw 13 is replaced with a telescopic rod, and the telescopic direction of the telescopic rod is parallel to the axial direction of the optical path channel. The second lens holder 3 or the third lens holder 4 is moved through the telescopic movement of the telescopic rod. The telescopic rod can be an electric telescopic rod, a pneumatic telescopic rod, or a hydraulic cylinder telescopic rod.

[0053] In one embodiment, there are two optical axes 12 in total. The second lens holder 3 and the third lens holder 4 are simultaneously slidably connected to the two optical axes 12 through their respective linear bearings 15. There are two lead screws 13 in total. The second lens holder 3 is threadedly connected to one of the lead screws 13 through the threaded sleeve 16, and the third lens holder 4 is threadedly connected to the other lead screw 13 through the threaded sleeve 16. According to the optical parameters and requirements, the two lead screws 13 are used for transmission, and the two optical axes 12 are used for support and guidance to achieve the axial displacement of the lens. Since the lens holders of the lenses are displaced on the two shared optical axes 12, the cumulative error is small, and the coaxiality can reach the micron level through alignment and adjustment.

[0054] In one embodiment, the installation housing includes a cylinder body 1 and an end cover 2. The end cover 2 is installed on the end opening of one end of the cylinder body 1. The end cover 2 and the first lens holder are integrally formed. An installation port 18 is provided on the end cover 2. The installation port 18 serves as the installation cavity for the first lens 7 and is used to install the first rotating sleeve 5. The second lens holder 3 and the third lens holder 4 are both located inside the cylinder body 1. The interior of the cylinder body 1 and the installation port 18 form a complete optical path channel. The lead screw 13 and the optical axis 12 are both parallel to the axial direction of the cylinder body 1. The cylinder body 1 is cylindrical.

[0055] In one embodiment, the cylinder body 1 and the end cover 2 are connected by bolts 11. Specifically, bolt holes are correspondingly provided on the cylinder body 1 and the end cover 2 for connecting the bolts 11.

[0056] In one embodiment, an installation ring 37 is provided at one end of the cylinder body 1 away from the end cover 2. The end cover 2 is provided with a optical axis installation groove and a bearing installation groove, and the installation ring 37 is provided with an optical axis installation groove and a lead screw installation groove. The optical axis installation groove of the end cover 2 corresponds to the optical axis installation groove of the installation ring 37. One end of the optical axis 12 is embedded in the optical axis installation groove of the end cover 2, and the other end of the optical axis 12 is embedded in the bearing installation groove of the installation ring 37. First threaded holes are provided on both the end cover 2 and the cylinder body 1. A first screw 30 is threadedly connected in the first threaded hole. Tightening the first screw 30 can press the optical axis 12 in the optical axis installation groove. Loosening the first screw 30 can facilitate the pulling out of the optical axis 12 from the optical axis installation groove, which is convenient for installation, replacement and maintenance. The bearing installation groove on the end cover 2 corresponds to the lead screw installation groove on the cylinder body 1. The lead screw installation groove includes a first groove section and a second groove section. Rotating bearings 17 are installed at both ends of the lead screw 13. The rotating bearing 17 at one end of the lead screw 13 is embedded in the bearing installation groove, and the other end of the lead screw 13 is embedded in the second groove section. The rotating bearing 17 at the end of the lead screw 13 embedded in the second groove section is embedded in the first groove section. A second threaded hole is provided on the cylinder body 1. A second screw 31 is threadedly connected in the second threaded hole. Tightening the second screw 31 can press the end of the lead screw 13 in the second groove section. A third threaded hole is further provided on the end cover 2. A third screw 32 is threadedly connected in the third threaded hole. Tightening the third screw 32 can press the rotating bearing 17 in the first groove section. Loosening the second screw 31 and the third screw 32 can facilitate the pulling out of the lead screw 13 and the rotating bearing 17 from the bearing installation groove and the lead screw installation groove, which is convenient for installation, replacement and maintenance.

[0057] In one embodiment, the adjustment port 20 is provided on the side of the end cover 2 facing the cylinder body 1. The handwheel 14 is preferably a knurled handwheel. Knurling can increase the friction force and avoid slipping off the hand. The knurled handwheel is fixed to the lead screw 13 by glue.

[0058] In an embodiment, a first strip-shaped opening 22 is provided on the cylinder body 1, and the first strip-shaped opening 22 extends along the axial direction of the cylinder body 1. The projections of the second lens holder 3 and the third lens holder 4 on the inner wall of the cylinder body 1 are located on the extension path of the first strip-shaped opening 22, and the second lens holder 3 and the third lens holder 4 inside the cylinder body 1 can be seen through the first strip-shaped opening 22. A first scale line 24 is provided at the first strip-shaped opening 22, and the first scale line 24 is arranged along the axial direction of the cylinder body 1. Through the first scale line 24, the positions where the second lens holder 3 and the third lens holder 4 are located can be marked respectively, so that by moving the second lens holder 3 and the third lens holder 4, the positions of the second lens holder 3 and the third lens holder 4 can be quantified, which is convenient for accurately adjusting the positions of the second lens holder 3 and the third lens holder 4. The length of the first strip-shaped opening 22 and the scale range of the first scale line 24 should not be less than the adjustment range of the second lens holder 3 and the third lens holder 4. For example, if the adjustment range of the second lens holder 3 and the third lens holder 4 is within 40 mm, the length of the first strip-shaped opening 22 and the scale range of the first scale line 24 should be more than 40 mm, such as set to 60 mm, 80 mm, 100 mm, etc., and can be adjusted according to actual needs.

[0059] In an embodiment, an adjustment hole 19 is provided on the end cover 2, and a fourth screw 33 is threadedly connected in the adjustment hole 19. Tightening the fourth screw 33 can press the first rotating sleeve 5 to lock the position of the first rotating sleeve 5 after the rotation adjustment is completed. A second strip-shaped opening 23 is also provided on the cylinder body 1, and the second strip-shaped opening 23 extends along the axial direction of the cylinder body 1. A fourth threaded hole is provided on the third lens holder 4, and a fifth screw 34 is threadedly connected to the fourth threaded hole. Tightening the fifth screw 34 can press the second rotating sleeve 6 to lock the position of the second rotating sleeve 6 after the rotation adjustment is completed. The projection of the fifth screw 34 on the inner wall of the cylinder body 1 is located on the extension path of the second strip-shaped opening 23, and a tool can be inserted into the cylinder body 1 through the second strip-shaped opening 23 to turn the fifth screw 34.

[0060] In an embodiment, if the first lens 7 and the fourth lens 10 do not need to be adjusted after the rotation adjustment is completed, in order to ensure the stability of the optical path, after the fourth screw 33 and the fifth screw 34 are tightened, glue can be injected into the adjustment hole 19 and the fourth threaded hole respectively, and the overflowing glue is on the outer walls of the first rotating sleeve 5 and the second rotating sleeve 6 to permanently fix the positions and prevent loosening.

[0061] In one embodiment, a first retaining ring 27 and a first convex ring 35 are installed in the first rotating sleeve 5. The first retaining ring 27 can press the first lens 7 onto the first convex ring 35. The first lens 7 is clamped by the first retaining ring 27 and the first convex ring 35 to complete the fixed installation of the first lens 7 in the first rotating sleeve 5. The first lens 7 can be driven to rotate by rotating the first rotating sleeve 5. A second retaining ring 28 and a second convex ring 36 are installed in the second rotating sleeve 6. The second retaining ring 28 can press the fourth lens 10 onto the second convex ring 36. The fourth lens 10 is clamped by the second retaining ring 28 and the second convex ring 36 to complete the fixed installation of the fourth lens 10 in the second rotating sleeve 6. The fourth lens 10 can be driven to rotate by rotating the second rotating sleeve 6. A third retaining ring 29 is installed on the mounting ring 37.

[0062] In one implementation, the second lens 8 is fixedly connected to the mounting cavity of the second lens holder 3 by glue dispensing.

[0063] In one embodiment, a second scale line 25 is provided on the end of the end cap 2 away from the barrel 1, and the second scale line 25 is arranged circumferentially along the mounting opening 18. A first indicator mark 38 is provided on the first rotating sleeve 5, and the first indicator mark 38 corresponds to the second scale line 25, so as to quantify the rotation angle of the first rotating sleeve 5, and the rotation angle of the first lens 7 can be accurately adjusted. A third scale line 26 is provided on the end surface of the third lens holder 4 facing the mounting ring 37, and the third scale line 26 is arranged circumferentially along the second rotating sleeve 6. A second indicator mark 39 is provided on the second rotating sleeve 6, and the second indicator mark 39 corresponds to the third scale line 26, so as to quantify the rotation angle of the second rotating sleeve 6, and the rotation angle of the fourth lens 10 can be accurately adjusted. The sleeve and the scale line are provided to realize a separate rotation indexing mechanism. This design integrates all moving parts into the barrel 1 and the end cap 2, and the structure is very compact.

[0064] In one embodiment, the end surfaces of the first rotating sleeve 5 and the second rotating sleeve 6 that are away from each other are both provided with a toggle slot 21, and the toggle slot 21 facilitates the insertion of a tool to toggle the first rotating sleeve 5 or the second rotating sleeve 6 to rotate, thereby avoiding the risk of direct hand contact and contamination of the lens. Specifically, the toggle slot 21 can be a straight slot or a round hole slot, such as two axially symmetrically arranged round hole slots are provided on the first rotating sleeve 5, and two axially symmetrically arranged straight slots are provided on the second rotating sleeve 6. The straight slot can be toggled by a straight screwdriver, and the round hole slot can be toggled by a round rod-shaped tool.

[0065] This homogenizing lens module has the following advantages:

[0066] 1. Easy-to-operate, fool-proof design: Two second strip openings 23 for conveniently locking the rotating mechanism and two first strip openings 22 with scales are arranged on the cylinder 1, which is convenient for users to operate and adjust.

[0067] 2. Compact design: All moving parts are integrated into the cylinder body 1, making the product small and delicate, and capable of being compatible with narrower spaces.

[0068] 3. Locking design: Each moving part is equipped with a locking screw, ensuring the stability of the optical elements, reducing external vibration interference, and guaranteeing the stability of the beam quality.

[0069] 4. High precision: To ensure the regular and square changes in the output spot size, high requirements are imposed on the moving fit tolerance and form and position accuracy. Two optical axes 12 are used to jointly guide the second mirror base 3 and the third mirror base 4, reducing the number of clamping times and assembly errors, ensuring the part accuracy, and precisely controlling the relative positions between the optical elements.

[0070] 5. Scale: Scale lines and numbers are set on both the first strip-shaped opening 22 and the lens mounting base, facilitating the user to locate the actual position of the lens movement.

[0071] In the present invention, specific examples are used to elaborate on the principles and implementation manners of the present invention. The descriptions of the above embodiments are only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, based on the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A homogenizing lens module, characterized in that: include: A mounting shell, wherein an optical path is provided in the mounting shell, wherein a first mirror seat, a second mirror seat and a third mirror seat are provided in sequence from one end to the other end of the optical path, wherein the first mirror seat is fixedly connected to the optical path, wherein mounting cavities of the first mirror seat, the second mirror seat and the third mirror seat are coaxially arranged, wherein a first rotating sleeve is coaxially rotatably connected in the mounting cavity of the first mirror seat, and wherein a second rotating sleeve is coaxially rotatably connected in the mounting cavity of the third mirror seat; An adjustment mechanism, the adjustment mechanism comprising a first linear adjustment component and a second linear adjustment component, the first linear adjustment component is used to drive the second mirror holder to move axially along the optical path, and the second linear adjustment component is used to drive the third mirror holder to move axially along the optical path; And a microlens array, the microlens array includes a first lens, a second lens, a third lens and a fourth lens, the first lens is coaxially fixedly connected in the first rotating sleeve, the second lens and the third lens are coaxially and fixedly connected in the mounting cavity of the second lens holder at a distance, the second lens is located between the first lens and the third lens, and the fourth lens is coaxially fixedly connected in the second rotating sleeve.

2. The homogenizing lens module according to claim 1, characterized in that: The polarization directions of the polarization coating of the second lens and the polarization coating of the third lens are perpendicular to each other.

3. The homogenizing lens module according to claim 1, characterized in that: The first linear adjustment component and the second linear adjustment component both include an optical axis and a lead screw, the optical axis is installed in the optical path channel, a linear bearing is sleeved on the optical axis, the lead screw is rotatably connected in the optical path channel, a hand wheel is coaxially fixedly connected to the lead screw, an adjustment port for exposing the hand wheel is provided on the mounting shell, a threaded sleeve is threadedly connected to the lead screw, the axial directions of the optical axis and the lead screw are parallel to the axial direction of the optical path channel, the threaded sleeve and the linear bearing of the first linear adjustment component are both fixedly connected to the second mirror seat, and the threaded sleeve and the linear bearing of the second linear adjustment component are both fixedly connected to the third mirror seat.

4. The homogenizing lens module according to claim 3, characterized in that: The mounting shell includes a barrel and an end cover, wherein the end cover is mounted on an end opening of the barrel, the end cover and the first lens seat are integrally formed, and the end cover is provided with a mounting opening serving as a mounting cavity for the first lens, and the second lens seat and the third lens seat are both located within the barrel.

5. The homogenizing lens module according to claim 4, characterized in that: A mounting ring is provided at one end of the cylinder away from the end cover, and an optical axis mounting groove is correspondingly provided on the end cover and the mounting ring, and the two ends of the optical axis are respectively embedded in the optical axis mounting groove of the end cover and the optical axis mounting groove on the mounting ring; a first screw is threadedly connected on both the end cover and the cylinder, and the first screw can press the optical axis in the optical axis mounting groove; a bearing mounting groove is also provided on the end cover, and a screw rod mounting groove is also provided on the cylinder, and the screw rod mounting groove includes a first groove section and a second groove section, and rotating bearings are installed at both ends of the screw rod, and the rotating bearing at one end of the screw rod is embedded in the bearing mounting groove, and the other end of the screw rod is embedded in the second groove section, and the rotating bearing on the end of the screw rod embedded in the second groove section is embedded in the first groove section; a second screw is also threadedly connected on the cylinder, and the second screw presses the end of the screw rod in the second groove section, and a third screw is also threadedly connected on the end cover, and the third screw is used to press the rotating bearing in the bearing mounting groove.

6. The homogenizing lens module according to claim 5, characterized in that: The cylinder is provided with a first strip-shaped opening, which extends along the axial direction of the cylinder. The projections of the second mirror seat and the third mirror seat on the inner wall of the cylinder are located on the extension path of the first strip-shaped opening. The first strip-shaped opening is provided with a first scale line, which is arranged along the axial direction of the cylinder.

7. The homogenizing lens module according to claim 4, characterized in that: The end cover is provided with an adjustment hole, and a fourth screw capable of tightening the first rotating sleeve is threadedly connected to the adjustment hole; a second strip-shaped opening is also provided on the cylinder body, and the second strip-shaped opening extends along the axial direction of the cylinder body; the third mirror seat is provided with a fifth screw capable of tightening the second rotating sleeve, and the projection of the fifth screw on the inner wall of the cylinder body is located on the extension path of the second strip-shaped opening.

8. The homogenizing lens module according to claim 5, characterized in that: A first retaining ring and a first convex ring for clamping the first lens are installed in the first rotating sleeve, a second retaining ring and a second convex ring for clamping the first lens are installed in the second rotating sleeve, and a third retaining ring is installed on the mounting ring.

9. The homogenizing lens module according to claim 8, characterized in that: The end cover is provided with second scale lines on one end away from the cylinder, and the second scale lines are arranged circumferentially along the mounting port. The first rotating sleeve is provided with first indicator lines, and the first indicator lines correspond to the second scale lines. The end surface of the third mirror holder facing the mounting ring is provided with third scale lines, and the third scale lines are arranged circumferentially along the second rotating sleeve. The second rotating sleeve is provided with second indicator lines, and the second indicator lines correspond to the third scale lines.

10. The homogenizing lens module according to claim 1, characterized in that: The end surfaces of the first rotating sleeve and the second rotating sleeve which are away from each other are both provided with shifting slots.

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