A variable-magnification laser beam expansion lens

Abstract

The present application discloses a variable-magnification laser beam expander lens, which belongs to the technical field of beam expanders. The lens comprises a lens barrel, a front lens sleeve, a middle lens sleeve, a movable lens sleeve, a rotating tube and a coaxial correction assembly. The outer diameter of the movable lens sleeve is smaller than the inner diameter of the lens barrel. A pin body is fixed in the middle of the movable lens sleeve. The lens barrel is provided with a strip hole for the pin body to move along the axial direction of the lens barrel. The cross section of the strip hole is an isosceles trapezoid. The rotating tube is coaxially rotatably connected with the lens barrel. The inner circumferential wall of the rotating tube is provided with a threaded hole matched with the pin body. The movable lens sleeve has two matching blocks with isosceles trapezoidal cross sections for radial sliding. The coaxial correction assembly is used to drive the matching block to radially slide into the strip hole. When the inclined surface of the matching block is matched with the inclined surface of the strip hole, the side surface of the matching block facing the axis of the lens barrel forms a circular reference surface with the inner circumferential wall of the lens barrel. The coaxial correction assembly drives the movable lens sleeve to radially move to be coaxial with the lens barrel based on the circular reference surface. The present application can improve the coaxiality between the movable lens sleeve and the lens barrel.

Description

Technical Field

[0001] The present application belongs to the technical field of beam expanders and relates to a variable-magnification laser beam expander lens. Background Art

[0002] With the continuous development of science and technology, laser technology has become the core driving force in many fields such as medicine, communication, manufacturing, etc. Laser systems play a key role in these applications, and laser beam expansion, as a crucial step, directly affects the propagation characteristics and application effects of the laser beam.

[0003] The prior art zoom collimator structure includes a lens barrel, a first lens group, a second lens group, a third lens group and a rotating tube, wherein the second lens group is fixed to the inner cavity of the lens sleeve, the first lens group and the second lens group are respectively located on both sides of the axial direction of the second lens group, the first lens group is threadedly connected to one end of the lens barrel, and the axial distance between the first lens group and the second lens group is adjusted by rotating the first lens group.

[0004] A pin body is fixed to the outer wall of the third lens group, and the lens barrel is provided with a strip hole for the pin body to move axially along the lens barrel, and the rotating tube is coaxially rotatably connected to the lens barrel, and the inner circumferential wall of the rotating tube is provided with a threaded hole that cooperates with the pin body, that is, by rotating the rotating tube, the threaded cooperation is utilized to drive the pin body to slide along the direction of the strip hole, thereby driving the third lens group to slide axially, so as to adjust the axial distance between the third lens group and the second lens group, and the moving stroke of the third lens group is greater than that of the first lens group.

[0005] Since the third lens group and the lens barrel are in a sliding fit, there is a certain movable gap between the outer circumference of the third lens group and the inner circumference of the lens barrel under this fit. When the movable gap is large, it is easy to cause the coaxiality between the third lens group and the lens barrel to decrease, thereby affecting the coaxiality between the third lens group and the second lens group, and further affecting the laser beam expansion effect. Summary of the invention

[0006] In order to improve the coaxiality between lens groups, a variable-magnification laser beam expander lens is provided.

[0007] The present application provides a variable-magnification laser beam expander lens, which is specifically implemented by the following technical solutions:

[0008] A variable-magnification laser beam expander lens comprises a lens barrel, a front lens sleeve, a middle lens sleeve, a movable lens sleeve, a rotating tube and a coaxial correction assembly, wherein the middle lens sleeve is fixed to the inner cavity of the lens barrel, the middle lens sleeve is provided with a second lens, the front lens sleeve and the movable lens sleeve are respectively located on both sides of the axial direction of the middle lens sleeve, the front lens sleeve is provided with a first lens, the front lens sleeve is threadedly connected to one end of the lens barrel, the movable lens sleeve is provided with a third lens, the outer diameter of the movable lens sleeve is smaller than the inner diameter of the lens barrel, a pin body is fixed in the middle of the movable lens sleeve, the lens barrel is provided with a strip hole for the pin body to move along the axial direction of the lens barrel, the cross section of the strip hole is an isosceles trapezoid, and the rotating tube is provided with a coaxial correction assembly. The movable tube is coaxially rotatably connected to the lens barrel, and the inner circumferential wall of the rotating tube is provided with a threaded hole that cooperates with the pin body; the movable lens sleeve radially slides and has two matching blocks with isosceles trapezoidal cross-sections, and the two matching blocks are respectively located on both sides of the pin body; the coaxial correction component is used to drive the matching block to radially slide into the strip hole, and when the inclined surface of the matching block cooperates with the inclined surface of the strip hole, the side surface of the matching block facing the axis of the lens barrel forms a circular reference surface with the inner circumferential wall of the lens barrel, and the coaxial correction component drives the movable lens sleeve to radially move to be coaxial with the lens barrel based on the circular reference surface.

[0009] Through the above technical scheme, after the axial position of the movable lens sleeve is adjusted, the coaxial correction component drives the matching block to slide radially into the strip hole. When the inclined surface of the matching block matches the inclined surface of the strip hole, the side surface of the matching block facing the axis of the lens barrel forms a circular reference surface with the inner circumferential wall of the lens barrel. At this time, the coaxial correction component drives the movable lens sleeve to move radially based on the circular reference surface, that is, adjusts the radial position of the movable lens sleeve to make it coaxial with the lens barrel, thereby improving the coaxiality between the third lens of the movable lens sleeve and the second lens of the middle lens sleeve.

[0010] Optionally, the coaxial correction component includes an elastic first sac-shaped ring sleeve and an air supply structure, both ends of the outer circumferential surface of the movable lens sleeve are provided with annular first mounting grooves, two first sac-shaped ring sleeves are respectively located in the two first mounting grooves, the inner circumferential wall of the first sac-shaped ring sleeve elastically wraps the bottom of the first mounting groove, and the movable lens sleeve is provided with a first air channel, and the first air channel is connected to the inner cavity of the first sac-shaped ring sleeve through a first air hole opened on the inner circumferential wall of the first sac-shaped ring sleeve; the air supply structure is used to supply air to the first air channel; when the first sac-shaped ring sleeve expands, the outer circumferential wall of the first sac-shaped ring sleeve drives the matching block to slide radially into the strip hole, and the outer circumferential wall of the first sac-shaped ring sleeve fits the circular reference surface.

[0011] Through the above technical solution, by setting up the first sac-shaped ring sleeve and the air transmission structure, when the first sac-shaped ring sleeve expands, the outer peripheral wall of the first sac-shaped ring sleeve drives the matching block to slide radially into the strip hole. During this period, the outer peripheral wall of the first sac-shaped ring sleeve is in contact with the circular reference surface, that is, the circular reference surface is used as a reference, and the expanded first sac-shaped ring sleeve also drives the movable lens sleeve to move radially, making it coaxial with the lens barrel.

[0012] Since the first sac-shaped ring sleeve expands uniformly everywhere in the inflated state, the gap between the movable lens sleeve and the inner wall of the lens barrel is equal everywhere, which greatly improves the coaxiality.

[0013] Optionally, the gas delivery structure includes a first air pipe and an air supply hose, a first through hole is opened at the end of the lens barrel, the first air pipe slides axially along the lens barrel through the first through hole, one end of the first air pipe is connected and fixed to the first air channel, and the other end of the first air pipe is fixed to the air supply hose.

[0014] With the above technical solution, the first air tube is slidably matched with the first through-hole to reduce interference with the first air tube during the axial movement of the movable lens sleeve.

[0015] Optionally, the cross-sectional outer contour of the first sac-shaped ring sleeve is a right-angled triangle, the cross-sectional contour of the first mounting groove is a right-angled triangle, the three surfaces of the first sac-shaped ring sleeve are respectively arranged as an outer ring portion, a conical portion and a right-angle portion, the right-angle portions of the two first sac-shaped ring sleeves are arranged apart, the conical portion elastically wraps the inclined groove bottom of the first mounting groove, and the outer ring portion is used to fit the circular reference surface.

[0016] Through the above technical solution, by providing a first sac-shaped ring with a right-angled triangle cross-sectional outer contour, the force of the expanded first sac-shaped ring will be applied to the movable lens cover through the tapered portion to play a centering role, thereby further improving the coaxiality of the movable lens cover.

[0017] Optionally, the coaxial correction component includes an elastic second sac-like ring sleeve, an air supply structure and a plurality of first wedge blocks, both ends of the outer circumferential surface of the movable mirror sleeve are provided with annular second mounting grooves, the cross-section of the second mounting groove is a right-angled trapezoid, the two second sac-like ring sleeves are respectively located in the two second mounting grooves, the first wedge blocks are evenly arranged along the circumference of the movable mirror sleeve, the inclined surface of the first wedge block is slidingly connected with the inclined groove wall of the second mounting groove, the movable mirror sleeve is provided with a second air pipe, the two ends of the first air pipe are respectively connected with the inner cavities of the two second sac-like ring sleeves; the air supply structure is used to supply air to the second air pipe; when the second sac-like ring sleeve expands axially, the end surface of the second sac-like ring sleeve drives the first wedge block to slide, the first wedge block drives the matching block to slide radially into the strip hole, and the surface of each first wedge block fits the circular reference surface.

[0018] Through the above technical solution, by providing the second capsule ring and the first wedge block, the inflated second capsule ring expands axially as a driving force to drive the first wedge block to slide, and the first wedge block is embedded between the circular reference surface and the inclined groove wall of the second installation groove to play a centering role, further improving the coaxiality of the movable lens cover. Secondly, the first wedge block has rigidity and its embedding stability is extremely strong, which can play a limiting role, thereby reducing the axial movement of the movable lens cover.

[0019] Optionally, the two matching blocks are fixedly connected via a sliding block, a sliding groove is provided in the middle of the outer peripheral surface of the movable mirror cover, and the sliding block is connected to the sliding groove by radial sliding along the movable mirror cover.

[0020] Through the above technical solution, a slider is set to connect the two mating blocks, and the sliding groove and the slider are matched to limit the sliding path of the mating block, so that the two mating blocks have high sliding synchronization and high-precision sliding linearity, and the high synchronization and high precision also react to the driving force of the coaxial correction component, so that the driving force synchronization is higher, and the matching accuracy with the circular reference surface is higher, further improving the coaxiality.

[0021] Optionally, the coaxial correction assembly includes a second wedge block, a driving ring, a gear, a rack and a spring, conical surfaces are provided at both end edges of the movable mirror cover, the second wedge blocks are evenly arranged along the circumference of the movable mirror cover, the inclined surface of the second wedge block is slidingly connected to the conical surface along the generatrix direction of the conical surface, the driving ring is coaxially arranged with the movable mirror cover, the driving ring is axially slidingly connected with the movable mirror cover, the gear is rotatably connected to the middle position of the inner circumference of the movable mirror cover, the gear axis is perpendicular to the axis of the movable mirror cover, one end of the two racks is respectively fixed to the two driving rings, the two racks are meshed with the gear, and the tooth surfaces of the two racks are arranged opposite to each other; the driving ring is provided with an abutment; the elastic force of the spring forces one of the driving rings to slide toward the other driving ring, and the abutment abuts against the end of the second wedge block to drive the second wedge block to slide, the second wedge block drives the matching block to slide radially into the strip hole, and the surface of each second wedge block fits the circular reference surface.

[0022] Through the above technical solution, the elastic force of the spring forces one of the drive rings to slide toward the other drive ring, and through the cooperation of the rack and the gear, the two drive rings will move axially synchronously by the same distance, so that the two drive rings move axially toward each other at the same time, and the abutment thereon abuts against the end of the second wedge block to drive the second wedge block to slide, and the second wedge block drives the matching block to slide radially into the strip hole, and the surface of each second wedge block fits against the circular reference surface, thereby completing the coaxial adjustment.

[0023] That is, there is no need for other external gas transmission structures. The driving force mainly comes from the spring, and the spring is always in contact with one of the driving rings. When the movable mirror sleeve moves axially to adjust the beam expansion factor, the movable mirror sleeve will also compress the spring. That is, the farther the movable mirror sleeve is from the middle mirror sleeve, the greater the elastic force of the spring, the greater the wedging force of the second wedge block, and the better the coaxial effect.

[0024] In addition, the elastic force of the spring will force the movable lens cover to move axially as a whole, so that the pin body and the threaded hole thereon fit more closely, thereby reducing the axial clearance between the pin body and the threaded hole and causing the movable lens cover to move axially.

[0025] Optionally, the coaxial correction component also includes a third air tube and a fourth air tube, the abutment is configured as a third sac-shaped ring sleeve, the third sac-shaped ring sleeve is coaxially arranged with the movable mirror sleeve, the third sac-shaped ring sleeve is located in the axial gap between the drive ring and the second wedge block, the outer wall of the third sac-shaped ring sleeve is integrally formed with a plurality of circumferentially evenly arranged sac-shaped inserts, the inner cavity of the sac-shaped inserts is connected with the inner cavity of the third sac-shaped ring sleeve, and the two outer walls of the sac-shaped inserts are respectively fitted with the opposite surfaces of two circumferentially adjacent second wedge blocks; the third air tube is used to connect the inner cavities of two third sac-shaped ring sleeves, the fourth air tube is spirally shaped, the spring passes through the fourth air tube, one end of the fourth air tube is connected with the inner cavity of one of the third sac-shaped ring sleeves, and the other end of the fourth air tube is connected with an air supply pipe.

[0026] Through the above technical solution, firstly, the expanded third sac-shaped ring sleeve plays the abutment role of the abutment member to drive the second wedge block to move; secondly, by setting the sac-shaped insert, after the sac-shaped insert expands, the two outer walls of the sac-shaped insert respectively fit with the opposite surfaces of two circumferentially adjacent second wedge blocks to correct the circumferential position of the second wedge block, and the sac-shaped insert and the second wedge block are jointly embedded in the wedge-shaped gap between the conical surface and the circular reference surface, so the embedding stability is stronger and the coaxiality correction effect is better.

[0027] Optionally, the width of the sac-shaped insert gradually decreases in a direction away from the third sac-shaped ring.

[0028] Through the above technical solution, when the sac-shaped insert expands, two adjacent sac-shaped inserts will clamp the second wedge-shaped block together and assist in pushing the second wedge-shaped block to move, so that the wedging accuracy is higher.

[0029] The beneficial effects of this application are:

[0030] 1. The coaxial correction component drives the matching block to slide radially into the strip hole. When the inclined surface of the matching block matches the inclined surface of the strip hole, the side surface of the matching block facing the axis of the lens barrel forms a circular reference surface with the inner wall of the lens barrel. At this time, the coaxial correction component drives the movable lens sleeve to move radially based on the circular reference surface, that is, adjusts the radial position of the movable lens sleeve to make it coaxial with the lens barrel, thereby improving the coaxiality between the third lens of the movable lens sleeve and the second lens of the middle lens sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a cross-sectional view of the overall structure of Example 1.

[0032] Figure 2 It is a cross-sectional view of the movable mirror case of Example 1.

[0033] Figure 3 This is a cross-sectional view of the rotating tube of Example 1.

[0034] Figure 4 Schematic diagram of the movable mirror sleeve of Example 1.

[0035] Figure 5 It is a cross-sectional view of the movable mirror case of Example 2.

[0036] Figure 6 Schematic diagram of the movable mirror sleeve of Example 3.

[0037] Figure 7 It is a cross-sectional view of the movable mirror case of Example 3.

[0038] Figure 8 It is a cross-sectional view of the movable mirror case of Example 4.

[0039] Fig. 9 It is a schematic diagram of Example 4 for demonstrating the matching relationship between the rack and the gear.

[0040] Fig.10 It is a schematic diagram of the movable mirror sleeve of Example 5.

[0041] Fig.11 It is a cross-sectional view of the movable mirror case of Example 5.

[0042] Fig.12 yes Fig.11 A partial enlarged view of point A in the middle.

[0043] Explanation of reference numerals: 1, lens barrel; 10, strip hole; 101, pin body; 102, matching block; 1021, slide groove; 1022, slider; 11, front lens sleeve; 111, first rotating ring; 112, first lens; 12, middle lens sleeve; 121, second lens; 13, movable lens sleeve; 131, third lens; 132, first mounting groove; 133, first air channel; 134, second mounting groove; 135, cone surface; 14, rotating tube; 141, second rotating ring; 142, threaded hole; 15, end cover; 21, first capsule ring sleeve; 211, first air hole; 212, cone portion; 213, outer ring 214, right angle portion; 22, first wedge block; 221, T-slot; 23, second sac-shaped ring; 231, second air hole; 25, abutment; 251, third sac-shaped ring; 252, sac-shaped insert; 253, third air hole; 31, first air pipe; 32, air supply hose; 33, second air pipe; 35, second wedge block; 36, drive ring; 361, rack; 362, gear; 363, slide bar; 364, slide hole; 365, second air channel; 366, first opening; 367, second opening; 368, third opening; 37, spring; 38, third air pipe; 39, fourth air pipe. DETAILED DESCRIPTION

[0044] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the attached Figure 1-Figure 12Shown in.

[0045] In the description of this specification, the description with reference to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0046] Example 1

[0047] Embodiment 1 discloses a variable-magnification laser beam expander lens.

[0048] like Figure 1 , Figure 2 , Figure 3 As shown, the variable-magnification laser beam expander lens comprises a lens barrel 1, a front lens sleeve 11, a middle lens sleeve 12, a movable lens sleeve 13, a rotating tube 14 and a coaxial correction component. The middle lens sleeve 12 is coaxially fixed to the inner cavity of the lens barrel 1. The middle lens sleeve 12 is coaxially provided with a second lens 121. There are two second lenses 121. The front lens sleeve 11 and the movable lens sleeve 13 are respectively located on both sides of the axial direction of the middle lens sleeve 12. The front lens sleeve 11 is provided with three first lenses 112. The front lens sleeve 11 is threadedly connected to one end of the lens barrel 1, and a first rotating ring 111 is fixed to the outer side of the front lens sleeve 11. The front lens sleeve 11 is driven to rotate relative to the lens barrel 1 by the first rotating ring 111, and the axial distance between the front lens sleeve 11 and the middle lens sleeve 12 is changed by threaded cooperation.

[0049] An annular end cap 15 is coaxially mounted on one end of the lens barrel 1 away from the front lens sleeve 11 .

[0050] The movable lens sleeve 13 is provided with a third lens 131 . The outer diameter of the movable lens sleeve 13 is smaller than the inner diameter of the lens barrel 1 , that is, there is a radial gap between the movable lens sleeve 13 and the lens barrel 1 .

[0051] A pin body 101 is fixed in the middle of the movable lens sleeve 13, and the lens barrel 1 is provided with a strip hole 10 for the pin body 101 to move axially along the lens barrel 1, that is, the axial movement freedom of the movable lens barrel 1 is met through the cooperation of the pin body 101 and the strip hole 10, wherein the cross-section of the strip hole 10 is an isosceles trapezoid, and the distance between the two opposite inclined surfaces of the strip hole 10 gradually decreases in the direction away from the lens barrel 1.

[0052] The rotating tube 14 is coaxially rotatably connected to the lens barrel 1, a second rotating ring 141 is fixed to the outer side of the rotating tube 14, and a threaded hole 142 is provided on the inner circumferential wall of the rotating tube 14 to cooperate with the pin body 101, that is, by rotating the rotating tube 14, the threaded cooperation is utilized to drive the pin body 101 to slide along the direction of the strip hole 10, thereby driving the movable lens sleeve 13 to slide axially, so as to adjust the axial distance between the third lens 131 and the second lens 121, and the moving stroke of the third lens 131 is greater than the moving stroke of the first lens 112.

[0053] like Figure 4 As shown, the movable mirror cover 13 has two matching blocks 102 for radial sliding, and the two matching blocks 102 are respectively located on both sides of the pin body 101, and the cross-section of the matching blocks 102 is an isosceles trapezoid. Specifically, a square slide groove 1021 is opened in the middle of the outer peripheral surface of the movable mirror cover 13, and a slider 1022 is connected to the slide groove 1021 for radial sliding along the movable mirror cover 13. The slider 1022 is in the shape of a square frame, and the pin body 101 is located in the hollow area of ​​the slider 1022. The outer side surface of the slider 1022 is fitted with the inner side surface of the slide groove 1021, and the two matching blocks 102 are fixed by the slider 1022, so as to realize the synchronous radial movement of the two matching blocks 102 relative to the movable mirror cover 13.

[0054] The coaxial correction assembly is used to drive the matching block 102 to slide radially into the strip hole 10. When the inclined surface of the matching block 102 matches the inclined surface of the strip hole 10, the side surface of the matching block 102 facing the axis of the lens barrel 1 forms a circular reference surface with the inner wall of the lens barrel 1. The coaxial correction assembly drives the movable lens sleeve 13 to move radially to be coaxial with the lens barrel 1 based on the circular reference surface.

[0055] Specifically, Figure 2 As shown, the coaxial correction component includes an elastic first sac-like ring sleeve 21 and an air delivery structure. Both ends of the outer circumferential surface of the movable lens cover 13 are provided with annular first mounting grooves 132. The first mounting groove 132 is coaxially arranged with the movable lens cover 13, and the cross-sectional profile of the first mounting groove 132 is rectangular. The two first sac-like ring sleeves 21 are respectively located in the two first mounting grooves 132. The first sac-like ring sleeve 21 is coaxially arranged with the movable lens cover 13. The cross-sectional profile of the first sac-like ring sleeve 21 is rectangular, and the inner circumferential wall of the first sac-like ring sleeve 21 elastically wraps the bottom of the first mounting groove 132. The inner circumferential wall of the first sac-like ring sleeve 21 is provided with a first air hole 211. The movable lens cover 13 is provided with a first air channel 133. The first air channel 133 is connected with the inner cavity of the first sac-like ring sleeve 21 through the first air hole 211.

[0056] The gas delivery structure is used to deliver gas to the first air channel 133. Specifically, the gas delivery structure includes a first air pipe 31 and an air supply hose 32. The end cover 15 is provided with a first through hole (not marked in the figure). The size of the first through hole is larger than the diameter of the first air pipe 31. The first air pipe 31 slides axially along the lens barrel 1 through the first through hole. One end of the first air pipe 31 is connected and fixed to the first air channel 133, and the other end of the first air pipe 31 is fixed to the air supply hose 32. The air supply hose 32 is connected to an external air supply device.

[0057] When the axial position of the movable lens sleeve 13 is adjusted, the air delivery structure inflates the first air pipe 31, so that the two first capsule-like ring sleeves 21 expand radially at the same time. At this time, the outer peripheral wall of the first capsule-like ring sleeve 21 drives the matching block 102 to slide radially into the strip hole 10, and the side surface of the matching block 102 facing the axis of the lens barrel 1 forms a circular reference surface with the inner peripheral wall of the lens barrel 1, and the outer peripheral wall of the first capsule-like ring sleeve 21 is in contact with the circular reference surface, that is, the circular reference surface is used as a reference, and the expanded first capsule-like ring sleeve 21 also drives the movable lens sleeve 13 to move radially at the same time, that is, the radial position of the movable lens sleeve 13 is adjusted to make it coaxial with the lens barrel 1, thereby improving the coaxiality between the third lens 131 of the movable lens sleeve 13 and the second lens 121 of the middle lens sleeve 12.

[0058] Example 2

[0059] The difference between Example 2 and Example 1 is that Figure 5 As shown, the cross-sectional outer contour of the first sac-shaped ring sleeve 21 is a right-angled triangle, the cross-sectional contour of the first mounting groove 132 is a right-angled triangle, the three surfaces of the first sac-shaped ring sleeve 21 are respectively arranged as an outer ring portion 213, a conical portion 212 and a right-angle portion 214, the right-angle portions 214 of the two first sac-shaped ring sleeves 21 are arranged apart, and the conical portion 212 elastically wraps the inclined groove bottom of the first mounting groove 132.

[0060] When the two first sac-like ring sleeves 21 expand at the same time, the outer ring portion 213 of the first sac-like ring sleeve 21 drives the matching block 102 to slide radially into the strip hole 10, and the side surface of the matching block 102 facing the axis of the lens barrel 1 forms a circular reference surface with the inner circumferential wall of the lens barrel 1. At this time, the outer ring portion 213 of the first sac-like ring sleeve 21 is in contact with the circular reference surface, and the conical portion 212 of the first sac-like ring sleeve 21 drives the movable lens sleeve 13 to move radially at the same time, that is, the force of the expanded first sac-like ring sleeve 21 will be applied to the movable lens sleeve 13 through the conical portion 212 to play a centering role, thereby further improving the coaxiality of the movable lens sleeve 13.

[0061] Example 3

[0062] The difference between Example 3 and Example 1 is that a coaxial correction component of another structure is adopted, such as Figure 6 , Figure 7As shown, the coaxial correction component includes a second elastic sac-shaped ring sleeve 23, an air delivery structure and a plurality of first wedge blocks 22. Both ends of the outer circumferential surface of the movable mirror sleeve 13 are provided with annular second mounting grooves 134. The cross-sectional shape of the second mounting groove 134 is a right-angled trapezoid. The first wedge block 22 has a small end and a large end (the portion with a smaller thickness is the small end, and the portion with a larger thickness is the large end). The large ends of the two first wedge blocks 22 are arranged apart. The first wedge blocks 22 are located in the second mounting groove 134. The first wedge blocks 22 are evenly arranged along the circumference of the movable mirror sleeve 13, and the inclined surface of the first wedge block 22 is slidingly connected to the inclined groove wall of the second mounting groove 134. The sliding connection method can be that a T-block (not shown in the figure) is fixed to the inclined surface of the first wedge block 22, and the inclined groove wall of the second mounting groove 134 is provided with a T-slot 221, and the T-block and the T-slot 221 are slidingly matched.

[0063] The second sac-like ring sleeve 23 is coaxially arranged with the movable mirror sleeve 13, and the two second sac-like ring sleeves 23 are respectively located in the two second mounting grooves 134. Specifically, the second sac-like ring sleeve 23 is located between the vertical groove wall of the second mounting groove 134 and the large end of the first wedge block 22, and one side of the second sac-like ring sleeve 23 is bonded to the vertical groove wall of the second mounting groove 134, and the side of the second sac-like ring sleeve 23 is bonded to the vertical groove wall of the second mounting groove 134. A second air hole 231 is provided on the side of the second sac-like ring sleeve 23, and the movable mirror sleeve 13 is provided with a second air pipe 33. The two ends of the first air pipe 31 are respectively connected with the inner cavities of the two second sac-like ring sleeves 23 through the second air holes 231.

[0064] Furthermore, the inner circumference and the outer circumference of the second capsule-shaped ring 23 are both wavy, so that the axial stretching and folding ability of the second capsule-shaped ring 23 is stronger.

[0065] The gas delivery structure is used to deliver gas into the second gas pipe 33 . The specific structure of the gas delivery structure in this embodiment is consistent with that in Embodiment 1.

[0066] After the first air pipe 31 of the air delivery structure delivers air to the second air pipe 33, the two second sac-shaped ring sleeves 23 expand axially, and the two ends of the second sac-shaped ring sleeves 23 respectively abut against the vertical groove wall of the second mounting groove 134 and the large end of the first wedge block 22, thereby driving the first wedge blocks 22 at both ends of the movable mirror cover 13 to move toward each other, and under the cooperation of the inclined groove wall of the second mounting groove 134, the first wedge block 22 also moves radially away from the axis of the movable mirror cover 13, thereby driving the matching block 102 to slide radially into the strip hole 10, and the surface of each first wedge block 22 is attached to the circular reference surface, that is, the first wedge block 22 is embedded between the circular reference surface and the inclined groove wall of the second mounting groove 134, so as to play a centering role, further improving the coaxiality of the movable mirror cover 13. Secondly, the first wedge block 22 has rigidity, and its embedding stability is extremely strong, which can play a limiting role, thereby reducing the axial movement of the movable mirror cover 13.

[0067] Example 4

[0068] The difference between Example 3 and Example 1 is that a coaxial correction component of another structure is adopted, such as Figure 8 , Fig. 9 As shown, the coaxial correction assembly includes a second wedge block 35, a drive ring 36, a gear 362, a rack 361 and a spring 37. Conical surfaces 135 are provided at the edges of both ends of the movable mirror cover 13. The second wedge block 35 has a small end and a large end (the portion with a smaller thickness is the small end, and the portion with a larger thickness is the large end). The large ends of the two second wedge blocks 35 are arranged apart, and each second wedge block 35 is evenly arranged along the circumference of the movable mirror cover 13. The inclined surface of the second wedge block 35 is slidingly connected to the conical surface 135 along the generatrix direction of the conical surface 135. This specific sliding mode is consistent with the sliding connection mode between the inclined surface of the first wedge block 22 and the inclined groove wall of the second mounting groove 134 in Example 3.

[0069] The driving ring 36 is coaxially arranged with the movable mirror cover 13. Two driving rings 36 are provided and are respectively located on both axial sides of the movable mirror cover 13. The driving ring 36 is axially slidingly connected with the movable mirror cover 13. Specifically, a sliding rod 363 is fixed to the end face of the driving ring 36. The sliding rod 363 is parallel to the axis of the movable mirror cover 13. A sliding hole 364 is provided on the end face of the movable mirror cover 13. The axial sliding connection between the driving ring 36 and the movable mirror cover 13 is realized through the sliding plug-in cooperation between the sliding rod 363 and the sliding hole 364.

[0070] The driving ring 36 is provided with an abutment member 25 . In this embodiment, the abutment member 25 is an annular structure. The abutment member 25 is coaxial with the movable lens sleeve 13 . The abutment member 25 is located between the end surface of the driving ring 36 and the large end of the second wedge block 35 .

[0071] The gear 362 is rotatably connected to the middle position of the inner circumference of the movable mirror cover 13, and the axis of the gear 362 is perpendicular to the axis of the movable mirror cover 13. One end of the two racks 361 is fixed to the two drive rings 36 respectively, and the two racks 361 are meshed with the gear 362. The tooth surfaces of the two racks 361 are arranged opposite to each other, that is, when one of the drive rings 36 moves, the meshing transmission of the rack 361 and the gear 362 will drive the other drive ring 36 to move, and the moving directions of the two drive rings 36 are towards or away from each other.

[0072] The spring 37 is coaxially arranged with the lens barrel 1 , one end of the spring 37 abuts against one of the driving rings 36 , and the other end of the spring 37 abuts against the end cover 15 .

[0073] The elastic force of the spring 37 forces one of the drive rings 36 to slide toward the other drive ring 36, and through the cooperation of the rack 361 and the gear 362, the two drive rings 36 will synchronously move axially by the same distance, so that the two drive rings 36 move axially toward each other at the same time, and the abutment 25 abuts against the end of the second wedge block 35 to drive the second wedge block 35 to slide, and one of the second wedge blocks 35 drives the matching block 102 to radially slide into the strip hole 10 to form a circular reference surface, and the surface of each second wedge block 35 is in contact with the circular reference surface, that is, the second wedge block 35 is embedded between the circular reference surface and the conical surface 135 of the movable mirror cover 13 to play a centering role, thereby further improving the coaxiality of the movable mirror cover 13.

[0074] Moreover, when the movable lens sleeve 13 moves axially to adjust the beam expansion multiple, the movable lens sleeve 13 will also compress the spring 37, that is, the farther the movable lens sleeve 13 is from the middle lens sleeve 12, the greater the elastic force of the spring 37, the greater the wedging force of the second wedge block 35, and the better the coaxial effect.

[0075] Example 5

[0076] The difference between the fifth embodiment and the fourth embodiment is that another abutment member 25 is proposed and other structures are added, specifically, as follows: Fig.10 , Fig.11 , Fig.12 As shown, the abutment member 25 is configured as a third capsule-shaped ring sleeve 251 , which is coaxially arranged with the movable mirror sleeve 13 , and is located in the axial gap between the driving ring 36 and the large end of the second wedge block 35 .

[0077] An outer wall of the third sac-shaped annulus 251 is integrally formed with a plurality of sac-shaped inserts 252 that are evenly arranged circumferentially. The inner cavity of the sac-shaped insert 252 is connected to the inner cavity of the third sac-shaped annulus 251. The width of the sac-shaped insert 252 gradually decreases in the direction away from the third sac-shaped annulus 251, and the two outer walls of the sac-shaped insert 252 are respectively fitted with the opposite surfaces of two circumferentially adjacent second wedge-shaped blocks 35, that is, the width of the second wedge-shaped block 35 gradually increases in the direction away from the third sac-shaped annulus 251.

[0078] The coaxial correction component also includes a third air tube 38 and a fourth air tube 39. A second air channel 365 is provided in the drive ring 36. The second air channel 365 has a first opening 366, a second opening 367 and a third opening 368. A third air hole 253 is provided on the side wall of the third sac-like ring sleeve 251 close to the drive ring 36. The side wall of the third sac-like ring sleeve 251 is bonded and connected to the drive ring 36. The first opening 366 is communicated with the third air hole 253. The third air tube 38 is axially penetrated and fixed to the movable mirror sleeve 13. The third air tube 38 is a hose. The two ends of the third air tube 38 are respectively communicated with the second openings 367 of the two drive rings 36, that is, the third air tube 38 is connected to the inner cavities of the two third sac-like ring sleeves 251.

[0079] The fourth air tube 39 is spiral-shaped, and the spring 37 passes through the inner cavity of the fourth air tube 39. One end of the fourth air tube 39 is connected to the third opening 368, that is, this end of the fourth air tube 39 is fixed on the driving ring 36, and the other end of the fourth air tube 39 is connected to the air supply pipe (not shown in the figure), and this end of the fourth air tube 39 is also located at the end of the spring 37. This end of the fourth air tube 39 also passes through the end cover 15, and the air supply pipe is located on the outside of the lens barrel 1.

[0080] The air in the air supply pipe enters the second air channel 365 through the fourth air pipe 39, causing the two third sac-like ring sleeves 251 and the multiple sac-like inserts 252 to expand simultaneously. At this time, the expanded third sac-like ring sleeves 251 play the abutment role of the abutment member 25 and combine with the elastic force of the spring 37 to jointly drive the second wedge block 35 to move, thereby completing the coaxiality adjustment.

[0081] Secondly, after the sac-shaped insert 252 expands, the two outer walls of the sac-shaped insert 252 respectively fit with the opposite surfaces of two circumferentially adjacent second wedge blocks 35 to correct the circumferential position of the second wedge blocks 35, and the sac-shaped insert 252 and the second wedge blocks 35 are jointly embedded in the wedge-shaped gap between the conical surface 135 and the circular reference surface, with stronger embedding stability and better coaxiality correction effect.

[0082] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A variable-magnification laser beam expander lens, characterized in that: The invention comprises a lens barrel (1), a front lens sleeve (11), a middle lens sleeve (12), a movable lens sleeve (13), a rotating tube (14) and a coaxial correction component, wherein the middle lens sleeve (12) is fixed to the inner cavity of the lens barrel (1), the middle lens sleeve (12) is provided with a second lens (121), the front lens sleeve (11) and the movable lens sleeve (13) are respectively located on two axial sides of the middle lens sleeve (12), the front lens sleeve (11) is provided with a first lens (112), the front lens sleeve (11) is threadedly connected to one end of the lens barrel (1), the movable lens sleeve (13) is provided with a third lens (131), the outer diameter of the movable lens sleeve (13) is smaller than the inner diameter of the lens barrel (1), and the movable lens sleeve (13) is provided with a third lens (131). A pin body (101) is fixed in the middle of the lens barrel (1); a strip hole (10) is provided in the lens barrel (1) for the pin body (101) to move axially along the lens barrel (1); the cross section of the strip hole (10) is an isosceles trapezoid; a rotating tube (14) is coaxially rotatably connected to the lens barrel (1); the inner peripheral wall of the rotating tube (14) is provided with a threaded hole (142) that matches the pin body (101); the movable lens sleeve (13) has two matching blocks (102) with isosceles trapezoidal cross sections for radial sliding, and the two matching blocks (102) are respectively located on both sides of the pin body (101); the coaxial correction component is used to drive the matching block (102) to slide radially to the strip hole ( 10), when the inclined surface of the matching block (102) matches with the inclined surface of the strip hole (10), the side surface of the matching block (102) facing the axis of the lens barrel (1) forms a circular reference surface with the inner peripheral wall of the lens barrel (1), and the coaxial correction component drives the movable lens sleeve (13) to move radially to be coaxial with the lens barrel (1) based on the circular reference surface, and the coaxial correction component includes a first elastic capsule ring sleeve (21) and an air transmission structure, and both ends of the outer peripheral surface of the movable lens sleeve (13) are provided with annular first installation grooves (132), and two first capsule ring sleeves (21) are respectively located in the two first installation grooves (132). The inner peripheral wall of the first sac-shaped ring sleeve (21) elastically wraps the bottom of the first installation groove (132); the movable mirror sleeve (13) is provided with a first air passage (133); the first air passage (133) is communicated with the inner cavity of the first sac-shaped ring sleeve (21) through a first air hole (211) opened on the inner peripheral wall of the first sac-shaped ring sleeve (21); the air delivery structure is used to deliver air into the first air passage (133); when the first sac-shaped ring sleeve (21) expands, the outer peripheral wall of the first sac-shaped ring sleeve (21) drives the matching block (102) to slide radially into the strip hole (10), and the outer peripheral wall of the first sac-shaped ring sleeve (21) is in contact with the circular reference surface.

2. The variable-magnification laser beam expander lens according to claim 1, characterized in that: The gas delivery structure comprises a first gas pipe (31) and a gas supply hose (32); a first through hole is formed at the end of the lens barrel (1); the first gas pipe (31) slides axially along the lens barrel (1) and passes through the first through hole; one end of the first gas pipe (31) is connected and fixed to the first gas channel (133); and the other end of the first gas pipe (31) is fixed to the gas supply hose (32).

3. The variable-magnification laser beam expander lens according to claim 1, characterized in that: The cross-sectional outer contour of the first sac-shaped ring sleeve (21) is a right-angled triangle, and the cross-sectional outer contour of the first mounting groove (132) is a right-angled triangle. The three surfaces of the first sac-shaped ring sleeve (21) are respectively configured as an outer ring portion (213), a conical portion (212) and a right-angle portion (214). The right-angle portions (214) of the two first sac-shaped ring sleeves (21) are arranged apart from each other. The conical portion (212) elastically wraps around the inclined groove bottom of the first mounting groove (132), and the outer ring portion (213) is used to fit the circular reference surface.

4. A variable-magnification laser beam expander lens, characterized in that: The invention comprises a lens barrel (1), a front lens sleeve (11), a middle lens sleeve (12), a movable lens sleeve (13), a rotating tube (14) and a coaxial correction component, wherein the middle lens sleeve (12) is fixed to the inner cavity of the lens barrel (1), the middle lens sleeve (12) is provided with a second lens (121), the front lens sleeve (11) and the movable lens sleeve (13) are respectively located on two axial sides of the middle lens sleeve (12), the front lens sleeve (11) is provided with a first lens (112), the front lens sleeve (11) is threadedly connected to one end of the lens barrel (1), the movable lens sleeve (13) is provided with a third lens (131), the outer diameter of the movable lens sleeve (13) is smaller than the inner diameter of the lens barrel (1), and a pin body (101) is fixed in the middle of the movable lens sleeve (13). The lens barrel (1) is provided with a strip hole (10) for a pin body (101) to move axially along the lens barrel (1), the cross section of the strip hole (10) being an isosceles trapezoid; a rotating tube (14) is coaxially rotatably connected to the lens barrel (1), the inner peripheral wall of the rotating tube (14) being provided with a threaded hole (142) cooperating with the pin body (101); the movable lens sleeve (13) is radially slidable and has two matching blocks (102) having isosceles trapezoidal cross sections, the two matching blocks (102) being respectively located on both sides of the pin body (101); the coaxial correction component is used to drive the matching blocks (102) to radially slide into the strip hole (10), and when the inclined surface of the matching block (102) is aligned with the inclined surface of the strip hole (10), the matching blocks (102) are radially slidable and ... When mating, the side surface of the mating block (102) facing the axis of the lens barrel (1) forms a circular reference surface with the inner peripheral wall of the lens barrel (1), and the coaxial correction component drives the movable lens sleeve (13) to move radially to be coaxial with the lens barrel (1) based on the circular reference surface, and the coaxial correction component comprises an elastic second capsule ring sleeve (23), an air transmission structure and a plurality of first wedge blocks (22), and both ends of the outer peripheral surface of the movable lens sleeve (13) are provided with an annular second mounting groove (134), the cross section of the second mounting groove (134) is a right-angle trapezoid, and the two second capsule ring sleeves (23) are respectively located in the two second mounting grooves (134), and each first wedge block (22) is provided with a plurality of first wedge blocks (22). ) are evenly arranged along the circumference of the movable mirror sleeve (13), the inclined surface of the first wedge block (22) is slidably connected to the inclined groove wall of the second mounting groove (134), the movable mirror sleeve (13) is provided with a second air pipe (33), the two ends of the first air pipe (31) are respectively connected to the inner cavities of the two second sac-shaped ring sleeves (23); the air supply structure is used to supply air to the second air pipe (33); when the second sac-shaped ring sleeve (23) expands axially, the end surface of the second sac-shaped ring sleeve (23) drives the first wedge block (22) to slide, and the first wedge block (22) drives the matching block (102) to slide radially into the strip hole (10), and the surface of each first wedge block (22) is in contact with the circular reference surface.

5. The variable-magnification laser beam expander lens according to any one of claims 1 to 4, characterized in that: The two matching blocks (102) are fixedly connected via a sliding block (1022); a sliding groove (1021) is provided in the middle of the outer peripheral surface of the movable mirror sleeve (13); and the sliding block (1022) is connected to the sliding groove (1021) by radial sliding movement along the movable mirror sleeve (13).

6. A variable-magnification laser beam expander lens, characterized in that: The invention comprises a lens barrel (1), a front lens sleeve (11), a middle lens sleeve (12), a movable lens sleeve (13), a rotating tube (14) and a coaxial correction component. The middle lens sleeve (12) is fixed to the inner cavity of the lens barrel (1). The middle lens sleeve (12) is provided with a second lens (121). The front lens sleeve (11) and the movable lens sleeve (13) are respectively located on two axial sides of the middle lens sleeve (12). The front lens sleeve (11) is provided with a first lens (112). The front lens sleeve (11) is threadedly connected to one end of the lens barrel (1). The movable lens sleeve (13) is provided with a third lens (131). The outer diameter of the movable lens sleeve (13) is smaller than the inner diameter of the lens barrel (1). A pin body (101) is fixed to the middle of the movable lens sleeve (13). The lens barrel (1) is provided with a pin body (101) for the pin body (101) to move along the axial direction of the lens barrel (1). The movable lens sleeve (13) comprises a movable strip hole (10), the cross section of the strip hole (10) is an isosceles trapezoid, the rotating tube (14) is coaxially rotatably connected with the lens barrel (1), and the inner peripheral wall of the rotating tube (14) is provided with a threaded hole (142) that cooperates with the pin body (101); the movable lens sleeve (13) has two matching blocks (102) with isosceles trapezoidal cross sections, and the two matching blocks (102) are respectively located on both sides of the pin body (101); the coaxial correction component is used to drive the matching blocks (102) to radially slide into the strip hole (10), and when the inclined surface of the matching block (102) cooperates with the inclined surface of the strip hole (10), the side surface of the matching block (102) facing the axis of the lens barrel (1) forms a circular reference surface with the inner peripheral wall of the lens barrel (1), and the coaxial correction component The movable mirror sleeve (13) is driven to move radially to be coaxial with the mirror barrel (1) with a circular reference surface as a reference. The coaxial correction component comprises a second wedge block (35), a drive ring (36), a gear (362), a rack (361) and a spring (37). Conical surfaces (135) are provided at both end edges of the movable mirror sleeve (13). The second wedge blocks (35) are evenly arranged along the circumference of the movable mirror sleeve (13). The inclined surfaces of the second wedge blocks (35) are slidably connected to the conical surfaces (135) along the generatrix direction of the conical surfaces (135). The drive ring (36) is coaxially arranged with the movable mirror sleeve (13). The drive ring (36) is axially slidably connected to the movable mirror sleeve (13). The gear (362) is slidably connected to the middle portion of the inner circumference of the movable mirror sleeve (13). The two drive rings (36) are rotatably connected, the axis of the gear (362) is perpendicular to the axis of the movable mirror sleeve (13), one end of the two racks (361) is fixed to the two drive rings (36) respectively, the two racks (361) are meshed with the gear (362), and the tooth surfaces of the two racks (361) are arranged opposite to each other; the drive ring (36) is provided with an abutment member (25); the elastic force of the spring (37) forces one of the drive rings (36) to slide toward the other drive ring (36), and the abutment member (25) abuts against the end of the second wedge block (35) to drive the second wedge block (35) to slide, and the second wedge block (35) drives the matching block (102) to slide radially into the strip hole (10), and the surface of each second wedge block (35) is in contact with the circular reference surface.

7. The variable-magnification laser beam expander lens according to claim 6, characterized in that: The coaxial correction component further comprises a third air tube (38) and a fourth air tube (39); the abutment member (25) is configured as a third sac-shaped ring sleeve (251); the third sac-shaped ring sleeve (251) is coaxially arranged with the movable mirror sleeve (13); the third sac-shaped ring sleeve (251) is located in the axial gap between the drive ring (36) and the second wedge block (35); the outer wall of the third sac-shaped ring sleeve (251) is integrally formed with a plurality of sac-shaped inserts (252) evenly arranged around the circumference; the inner cavity of the sac-shaped inserts (252) is axially spaced from the movable mirror sleeve (13); The inner cavities of the third sac-shaped ring sleeves (251) are connected, and the two outer walls of the sac-shaped insert (252) are respectively fitted with the opposite surfaces of two circumferentially adjacent second wedge-shaped blocks (35); the third air pipe (38) is used to connect the inner cavities of the two third sac-shaped ring sleeves (251); the fourth air pipe (39) is spiral-shaped; the spring (37) passes through the fourth air pipe (39); one end of the fourth air pipe (39) is connected to the inner cavity of one of the third sac-shaped ring sleeves (251); and the other end of the fourth air pipe (39) is connected to the air supply pipe.

8. The variable-magnification laser beam expander lens according to claim 7, characterized in that: The width of the sac-shaped insert (252) gradually decreases in a direction away from the third sac-shaped ring (251).

Images