CN219016726U

CN219016726U - Divergence angle adjustable laser beam expander

Info

Publication number: CN219016726U
Application number: CN202223569104.3U
Authority: CN
Inventors: 杨小艳; 韩微微; 刘虎; 武子瀚
Original assignee: Beijing Oriental Sharp Laser Technology Co ltd
Current assignee: Beijing Oriental Sharp Laser Technology Co ltd
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2023-05-12
Anticipated expiration: 2032-12-30

Abstract

The utility model discloses a laser beam expander with an adjustable divergence angle, which comprises a base, a stepping motor, a speed reducing wheel, a lens barrel, a sliding piece, a guide pin, a rotary wheel sleeve, a screw sleeve, a lock ring, a limit switch, an inner lens barrel, a first lens, a second lens, a third lens and a fourth lens; the sliding piece is connected with the lens cone in a sliding manner, the sliding piece is connected with the guide pin, the guide pin is connected with the inclined chute of the rotating wheel sleeve in a sliding manner, one end of the rotating wheel sleeve is sleeved with the lens cone, the other end of the rotating wheel sleeve is sleeved with the screw sleeve, the inner lens cone is sleeved inside the thin end of the lens cone, the inner lens cone is connected with the sliding piece through the bolt, the inner lens cone is fixedly connected with the first lens, and the second lens, the third lens and the fourth lens are fixedly connected inside the thin end of the lens cone. According to the utility model, the eyepiece negative lens is split into two pieces, so that the distance between the split two lenses is reasonable and can be adjusted, the requirement of the beam expander on mechanical adjustment precision is reduced, the function of stably adjusting the distance between the two eyepiece lenses is realized, and the function of precisely adjusting the laser divergence angle is further realized.

Description

Divergence angle adjustable laser beam expander

Technical Field

The utility model relates to the technical field of laser beam expansion, in particular to a laser beam expander with an adjustable divergence angle.

Background

The laser has the advantages of strong collimation, high monochromaticity, good coherence and the like, and has wide application in the fields of laser processing technology, laser medical treatment and photon biology, laser detection and metering technology, laser holographic technology, laser spectrum analysis technology, nonlinear optics, ultrafast laser optics, laser chemistry, quantum optics, laser radar, laser separation isotopes and the like.

At present, spherical lens groups are mostly adopted for the laser beam expander, and the adjustment of the divergence angle is realized by changing the distance between lenses. The laser beam expander is generally composed of an eyepiece and an objective lens. The ratio of the focal length of the objective lens to the focal length of the ocular lens is the expansion multiple, and can be similar to the divergence angle compression multiple. Typically, when it is desired to adjust the divergence angle of the laser beam, this is achieved by varying the spacing between the objective lens and the eyepiece. The adjusting method is simple in structure and easy to realize. The disadvantage is that higher displacement precision is required, and higher requirements are put on machining, installing and debugging precision of a mechanical structure, otherwise, accurate adjustment of a divergence angle is difficult to realize, and implementation is difficult.

Disclosure of Invention

The utility model aims to provide a laser beam expander with an adjustable divergence angle so as to solve the problems in the background technology.

The utility model is realized by the following technical scheme:

a laser beam expander with adjustable divergence angle comprises a base, a stepping motor, a reduction gear, a lens barrel, a sliding piece, a guide pin, a rotary wheel sleeve, a screw sleeve, a locking ring, a limit switch, an inner lens barrel, a first lens, a second lens, a third lens and a fourth lens;

the base is connected with the stepping motor, the base is rotationally connected with a wheel shaft of the reduction wheel, the reduction wheel is respectively meshed with an output gear of the stepping motor and a rotating gear of the rotating wheel sleeve, the lens barrel is connected with the base, the sliding piece is in sliding connection with the lens barrel, the sliding piece is connected with the guide pin, the guide pin is in sliding connection with an inclined chute of the rotating wheel sleeve, one end of the rotating wheel sleeve is sleeved with the lens barrel, the other end of the rotating wheel sleeve is sleeved with the screw sleeve, an external thread of the end part of the screw sleeve is connected with an internal thread of the thin end of the lens barrel, the screw sleeve is connected with the rotating wheel sleeve to limit the side face of the base, the thin end of the lens barrel is internally sleeved with the inner lens barrel, the inner lens barrel is connected with the sliding piece through a bolt, the inner thin end of the lens barrel is internally fixedly connected with the second lens barrel, the inner thick end of the lens barrel is internally and sequentially and fixedly connected with the third lens and the fourth lens barrel.

Further, the first lens and the second lens are negative lenses, and the third lens and the fourth lens are positive lenses.

Further, protruding sliding rails are arranged on the left side and the right side of the outer wall of the thin end section of the lens barrel, long through holes are arranged on the upper side and the lower side of the outer wall of the thin end section of the lens barrel, limiting protrusions for limiting the rotary wheel sleeve are arranged on the outer wall of the thin end section of the lens barrel, and mounting feet are arranged on the outer wall of the lens barrel;

the inner wall of the sliding part is provided with a sliding groove, a first bolt hole is arranged on the upper part and the lower part, guide pin mounting holes are arranged on the two sides of the sliding part, and a collision plate is arranged on one side of the sliding part;

a second bolt hole is formed in the upper portion and the lower portion of the outer wall of the inner lens barrel;

the sliding rail is in sliding connection with the sliding groove, the first bolt hole is connected with the second bolt hole through a bolt, the bolt penetrates through the long through hole, and the guide pin mounting hole is connected with the guide pin.

Further, the rotary gear is arranged on the outer wall of the rotary wheel sleeve, which is close to one end, and the two inclined sliding grooves are symmetrically arranged on the outer wall of the rotary wheel sleeve in a rotating mode.

Further, the end of the limit switch is close to the collision plate of the sliding piece, and the installation position of the limit switch on the base is adjustable along the length direction. By adjusting the position of the limit switch, the displacement limit position of the slider can be set.

Compared with the prior art, the utility model has the beneficial effects that:

the utility model structurally splits the eyepiece negative lens into two pieces by splitting the eyepiece negative lens, designs proper focal power, ensures that the distance between the split two lenses is reasonable and can be adjusted, has accurate and controllable displacement adjustment, and reduces the requirement of the beam expander on mechanical adjustment precision. The device provided by the utility model realizes the function of stably adjusting the distance between the two eyepiece lenses, and further realizes the function of precisely adjusting the laser divergence angle.

The utility model enlarges the stroke of adjusting the divergence angle by arranging the two ocular lenses, thereby realizing high-precision adjustment of the divergence angle, when the same divergence angle variation is adjusted, the original structure needs to adjust the distance between the single ocular lens and the objective lens, and usually only needs to adjust the stroke of a few tenths of millimeters, so the small adjustment quantity leads the structure processing of the beam expander and the debugging difficulty of the divergence angle to be higher.

Drawings

FIG. 1 is a schematic view of a laser beam expander with adjustable divergence angle;

FIG. 2 is a schematic view of a side of a laser beam expander with adjustable divergence angle with limit switch;

FIG. 3 is a cross-sectional view of a divergence angle adjustable laser beam expander;

fig. 4 is a schematic structural view of the lens barrel;

FIG. 5 is a schematic view of the configuration of the runner;

fig. 6 is a schematic structural view of the inner barrel;

FIG. 7 is a schematic structural view of a rotating hub;

fig. 8 is a schematic view of the optical path structure.

In the figure: 1. a base; 2. a stepping motor; 3. a reduction gear; 4. a lens barrel; 41. a slide rail; 42. a long through hole; 43. a limit protrusion; 44. a mounting foot; 5. a runner; 51. a chute; 52. a first bolt hole; 53. a guide pin mounting hole; 54. a collision plate; 6. a guide pin; 7. a rotary wheel sleeve; 71. a rotary gear; 72. an inclined chute; 8, a screw sleeve; 9. a locking ring; 10. a limit switch; 11. an inner barrel; 111. a second bolt hole; 12. a first lens; 13. a second lens; 14. a third lens; 15. and a fourth lens.

Detailed Description

In order that the technical features of the present utility model may be more clearly understood, a detailed description of the structure of the present utility model is provided below with reference to the accompanying drawings.

An embodiment of the present utility model provides:

as shown in fig. 1-3, the laser beam expander with adjustable divergence angle comprises a base 1, a stepping motor 2, a reduction gear 3, a lens barrel 4, a sliding piece 5, a guide pin 6, a rotary gear sleeve 7, a screw sleeve 8, a locking ring 9, a limit switch 10, an inner lens barrel 11, a first lens 12, a second lens 13, a third lens 14 and a fourth lens 15;

the base 1 is connected with the stepping motor 2, the base 1 is rotationally connected with a wheel shaft of the reduction wheel 3, the reduction wheel 3 is respectively meshed with an output gear of the stepping motor 2 and a rotating gear 71 of the rotating wheel sleeve 7, the lens barrel 4 is connected with the base 1, the sliding piece 5 is slidingly connected with the lens barrel 4, the sliding piece 5 is connected with the guide pin 6, the guide pin 6 is slidingly connected with a chute 72 of the rotating wheel sleeve 7, one end of the rotating wheel sleeve 7 is sleeved with the lens barrel 4, the other end of the rotating wheel sleeve 7 is sleeved with the screw sleeve 8, an external thread at the end of the screw sleeve 8 is connected with an internal thread at the thin end of the lens barrel 4, the locking ring 9 is connected with the screw sleeve 8 and limits the rotating wheel sleeve 7, the side surface of the base 1 is connected with the limit switch 10, the thin end of the lens barrel 4 is internally sleeved with the inner lens barrel 11, the inner lens barrel 11 is fixedly connected with the sliding piece 5 through a bolt, the inner lens 11 is fixedly connected with the lens barrel 12, the inner lens barrel 4 is fixedly connected with the inner lens barrel 12, and the inner lens barrel 11 is fixedly connected with the inner lens barrel 13 and the inner lens barrel 13, and the inner lens barrel 13 is fixedly connected with the inner lens barrel 13 and the inner lens barrel 4 and the outer lens barrel 4 are sequentially.

Further, the first lens 12 and the second lens 13 are negative lenses, and the third lens 14 and the fourth lens 15 are positive lenses.

Further, as shown in fig. 4, protruding sliding rails 41 are provided on the left and right sides of the outer wall of the thin end section of the lens barrel 4, long through holes 42 are provided up and down, a limit protrusion 43 for limiting the rotary wheel sleeve 7 is provided on the outer wall of the thin end section of the lens barrel 4, and mounting legs 44 are provided on the outer wall of the lens barrel 4;

as shown in fig. 5, the inner wall of the sliding member 5 is provided with a sliding groove 51, a first bolt hole 52 is arranged on the upper and lower sides, guide pin mounting holes 53 are arranged on the two sides, and a collision plate 54 is arranged on one side;

as shown in fig. 6, the outer wall of the inner barrel 11 is provided with a second bolt hole 111 up and down;

the sliding rail 41 is slidably connected with the sliding groove 51, the first bolt hole 52 and the second bolt hole 111 are connected through bolts, the bolts penetrate through the long through holes 42, and the guide pin mounting holes 53 are connected with the guide pins 6.

Further, as shown in fig. 7, the rotation gear 71 is disposed on an outer wall of the rotating wheel housing 7 near one end, and the two inclined sliding grooves 72 are disposed on the outer wall of the rotating wheel housing 7 in a rotationally symmetrical manner.

Further, as shown in fig. 2, the end of the limit switch 10 is close to the collision plate 54 of the slider 5, and the installation position of the limit switch 10 on the base 1 is adjustable along the length direction. By adjusting the position of the limit switch 10, the displacement limit position of the slider 5 can be set.

The working principle of the utility model is as follows:

the speed reducing wheel 3 can be driven to rotate by forward and reverse rotation of the stepping motor 2, the rotary wheel sleeve 7 is driven to rotate around the lens cone 4 and the screw sleeve 8, the guide pin 6 drives the sliding piece 5 to generate sliding displacement along the length direction of the lens cone 4 through the inclined chute 72 of the rotary wheel sleeve 7, the sliding piece 5 drives the inner lens cone 11 in the lens cone 4 to move through the bolt, and then the distance between the first lens 12 installed in the inner lens cone 11 and the second lens 13 installed in the lens cone 4 is adjusted.

As shown in fig. 8, the present utility model uses two negative lenses, lens one 12 and lens two 13, as eyepieces, which are spaced apart by a distance of about 10mm in view of ease of installation and adjustment. Two positive lenses, lens three 14 and lens four 15, act as objective lenses. The laser is firstly diffused through the ocular lens and then is restored to be nearly parallel light through the objective lens, so that the beam expanding function of the laser is realized, and the fine adjustment of the focal length of the negative lens is realized by adjusting the distance between the first lens 12 and the second lens 13 of the ocular lens, so that the purpose of adjusting the divergence angle of the laser is achieved.

The optical path parameters of a lens assembly provided in this embodiment are shown in table 1.

TABLE 1 optical Structure Meter

The present utility model has been described in detail by way of examples, but the description is merely exemplary of the utility model and should not be construed as limiting the scope of the utility model. The scope of the utility model is defined by the claims. In the technical scheme of the utility model, or under the inspired by the technical scheme of the utility model, similar technical schemes are designed to achieve the technical effects, or equivalent changes and improvements to the application scope are still included in the protection scope of the patent coverage of the utility model.

Claims

1. The utility model provides a divergence angle adjustable laser beam expander which characterized in that: the device comprises a base (1), a stepping motor (2), a reduction gear (3), a lens cone (4), a sliding piece (5), a guide pin (6), a rotary wheel sleeve (7), a screw sleeve (8), a lock ring (9), a limit switch (10), an inner lens cone (11), a first lens (12), a second lens (13), a third lens (14) and a fourth lens (15);

the base (1) is connected with the stepping motor (2), the base (1) is rotationally connected with a wheel shaft of the reduction wheel (3), the reduction wheel (3) is respectively meshed with an output gear of the stepping motor (2) and a rotating gear (71) of the rotating wheel sleeve (7), the lens barrel (4) is connected with the base (1), the sliding piece (5) is in sliding connection with the lens barrel (4), the sliding piece (5) is connected with the guide pin (6), the guide pin (6) is in sliding connection with a chute (72) of the rotating wheel sleeve (7), one end of the rotating wheel sleeve (7) is sleeved with the lens barrel (4), the other end of the rotating wheel sleeve (7) is sleeved with the screw sleeve (8), an external thread at the end of the screw sleeve (8) is connected with an internal thread at the thin end of the lens barrel (4), the lock ring (9) is connected with the screw sleeve (8) and limits the rotating wheel sleeve (7), the side surface of the base (1) is connected with the switch (10), the inner end of the lens barrel (11) is connected with the thin end of the lens barrel (11), the inner part of the thin end of the lens cone (4) is fixedly connected with the second lens (13) at the rear of the inner lens cone (11), and the inner part of the thick end of the lens cone (4) is sequentially and fixedly connected with the third lens (14) and the fourth lens (15) from inside to outside.

2. The adjustable divergence angle laser beam expander of claim 1, wherein: the first lens (12) and the second lens (13) are negative lenses, and the third lens (14) and the fourth lens (15) are positive lenses.

3. The adjustable divergence angle laser beam expander of claim 1, wherein: the left side and the right side of the outer wall of the thin end section of the lens cone (4) are provided with raised sliding rails (41) and long through holes (42) in the upper and the lower directions, the outer wall of the thin end section of the lens cone (4) is provided with limiting protrusions (43) for limiting the rotary wheel sleeve (7), and the outer wall of the lens cone (4) is provided with mounting feet (44);

the inner wall of the sliding piece (5) is provided with a sliding groove (51), a first bolt hole (52) is arranged on the upper part and the lower part, guide pin mounting holes (53) are arranged on the two sides, and a collision plate (54) is arranged on one side;

a second bolt hole (111) is formed in the upper part and the lower part of the outer wall of the inner lens barrel (11);

the sliding rail (41) is connected with the sliding groove (51) in a sliding mode, the first bolt hole (52) and the second bolt hole (111) are connected through bolts, the bolts penetrate through the long through holes (42), and the guide pin mounting holes (53) are connected with the guide pins (6).

4. The adjustable divergence angle laser beam expander of claim 1, wherein: the rotary gear (71) is arranged on the outer wall of one end, close to the rotary wheel sleeve (7), of the rotary wheel sleeve, and the two inclined sliding grooves (72) are symmetrically arranged on the outer wall of the rotary wheel sleeve (7) in a rotating mode.

5. The adjustable divergence angle laser beam expander of claim 1, wherein: the end of the limit switch (10) is close to the collision plate (54) of the sliding piece (5), and the installation position of the limit switch (10) on the base (1) is adjustable along the length direction.