CN210572964U

CN210572964U - Beam expander capable of adjusting divergence angle

Info

Publication number: CN210572964U
Application number: CN201921271656.1U
Authority: CN
Inventors: 谢兰强; 云子艳; 韩天亮; 乔迁; 韩薇薇
Original assignee: Beijing Oriental Sharp Laser Technology Co ltd
Current assignee: Beijing Oriental Sharp Laser Technology Co ltd
Priority date: 2019-08-07
Filing date: 2019-08-07
Publication date: 2020-05-19
Anticipated expiration: 2029-08-07

Abstract

The utility model discloses a beam expander of adjustable divergence angle, comprising a base plate, be equipped with drive control circuit on the bottom plate, expand the beam eyepiece, first beam expander, second beam expander, step motor, spacing sensor, step motor's output shaft passes through the shaft coupling and is connected with ball power, ball passes through first bearing, the second bearing is installed at first bearing mount pad, on the second bearing mount pad, first bearing mount pad and second bearing mount pad are fixed on the bottom plate, install the screw on the ball, be equipped with linear guide between beam expander and the second beam expander, the last slider that is equipped with of linear guide, first beam expander is fixed on the slider, first beam expander is connected with the screw through the switching piece, spacing sensor is fixed on beam expander, drive control circuit is connected with step motor and spacing sensor respectively. The utility model discloses can realize adjusting on a large scale of laser beam divergence angle, and small, stable in structure adjusts the precision height, is applicable to multiple job scene.

Description

Beam expander capable of adjusting divergence angle

Technical Field

The utility model relates to a technical field of laser beam expanding and collimation, concretely relates to beam expanding lens of adjustable divergence angle.

Background

Laser has the advantage of strong collimation, and has been widely used in many industries of national economic construction. However, since the laser beam is a parallel beam having a divergence angle, a laser spot emitted to a distant place becomes large, and energy per unit area becomes weak. In order to change the laser spot size of the emitted laser beam at a certain position, the divergence angle of the laser beam needs to be changed, so a laser beam expander is designed in the laser emission optical path. The divergence angle of the laser beam is generally changed in a defocusing mode, and the divergence angle of the laser beam is adjusted by adjusting the distance between the beam expanding objective lens and the beam expanding eyepiece.

At present, the divergence angle of the laser beam expander is adjusted through adding the gasket of different thickness in the beam expander lens below more, and the regulation all needs the dismouting lens at every turn, adjusts inefficiency, and accommodation range is little, and it is poor to adjust the precision, and difficult control expands the axiality between the lens, and easily causes the material extravagant.

Or two laser beam expanders are designed in one laser emitting light path for regulation, one of the laser beam expanders is designed into a structure capable of changing positions, when a large laser beam divergence angle is required, the laser beam expander is moved out of the light path, when a small laser beam divergence angle is required, the laser beam expander is moved into the laser light path, the positioning precision of the transposition method is limited by the size precision of the circular seam allowance and the positioning, and the positioning precision is low.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned problem that exists among the prior art, the utility model provides a beam expander of adjustable divergence angle rotates through step motor drive ball, and the screw drives first beam expanding objective back-and-forth movement, changes first beam expanding objective and expands the distance between eyepiece, the second beam expanding objective to carry out the regulation on a large scale of laser beam divergence angle, spacing sensor and drive control circuit's application has further improved the regulation precision and the fail safe nature of this device in addition.

The utility model provides a following technical scheme:

a beam expander capable of adjusting divergence angle comprises a bottom plate, a drive control circuit, a beam expanding ocular lens, a first beam expanding objective lens, a second beam expanding objective lens, a stepping motor and a limit sensor are arranged on the bottom plate, an output shaft of the stepping motor is in power connection with a ball screw through a coupler, the ball screw is arranged on a first bearing mounting seat and a second bearing mounting seat through a first bearing and a second bearing, the first bearing mounting seat and the second bearing mounting seat are fixed on the bottom plate, a nut is mounted on the ball screw, a linear guide rail is arranged between the beam expanding ocular and the second beam expanding objective, a slide block is arranged on the linear guide rail, the first beam expanding objective lens is fixed on the sliding block and is connected with the screw through a transfer block, the limiting sensor is fixed on the beam expanding ocular, and the driving control circuit is respectively connected with the stepping motor and the limiting sensor.

In another embodiment, the expander eyepiece lens is fixedly mounted within the expander eyepiece lens holder by an expander eyepiece gasket and an expander eyepiece clamping ring.

In another embodiment, the first expander objective lens is fixedly mounted in the first expander objective lens holder by a first expander objective lens gasket and a first expander objective lens clamping ring.

In another specific embodiment, the second expander objective lens is fixedly mounted in the second expander objective lens holder by a second expander objective lens gasket and a second expander objective lens clamping ring.

In another embodiment, the stepper motor is fixed to the base plate by a stepper motor mount.

In another embodiment, the limit sensor is secured to the expanded beam eyepiece frame by two limit sensor lock rings.

In another embodiment, the first bearing is mounted to the first bearing mount by a first bearing retainer ring and the second bearing is mounted to the second bearing mount by a second bearing retainer ring.

In another embodiment, the ball screw is axially retained by a retaining nut and a retaining spring.

In another embodiment, the ball screw is provided with different pitches.

In another specific embodiment, the second beam expanding objective lens is plural.

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

1. the utility model discloses a step motor drive ball rotates, and the screw turns into linear reciprocating motion with ball's rotation, drives first beam expanding objective back-and-forth movement, changes first beam expanding objective and expands the distance between beam expanding eyepiece, second beam expanding objective, makes the accommodation of laser beam divergence angle bigger, and the regulation precision is higher, and application scope is wide.

2. The utility model discloses an integrated design, the installation and debugging is simple, and fail safe nature is high.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic cross-sectional view of the present invention.

Wherein, 1-a drive control circuit, 2-a limit sensor, 3-a limit sensor lock ring, 4-an expanded beam eyepiece, 5-a first expanded beam objective, 6-a second expanded beam objective, 7-a bottom plate, 8-a second expanded beam objective lens, 9-a first expanded beam objective lens, 10-a second expanded beam objective clamping ring, 11-a second expanded beam objective gasket, 12-a first expanded beam objective gasket, 13-a first expanded beam objective clamping ring, 14-a slider, 15-a linear guide rail, 16-an expanded beam eyepiece lens, 17-an expanded beam eyepiece clamping ring, 18-an expanded beam eyepiece gasket, 19-a stepper motor mounting seat, 20-a stepper motor, 21-a coupler, 22-a fastening nut, 23-a first shaft clamping ring and 24-a first bearing, 25-a first bearing mounting seat, 26-a ball screw, 27-a nut, 28-a transfer block, 29-a second bearing mounting seat, 30-a second bearing, 31-a snap spring and 32-a second bearing ring.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments, and it is to be understood that the described embodiments are merely illustrative of some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The first embodiment is as follows:

referring to fig. 1 to 2, a beam expander capable of adjusting an angle of divergence comprises a base plate 7, a drive control circuit 1, a beam expander eyepiece 4, a first beam expander objective 5, a second beam expander objective 6, a stepping motor 20 and a limit sensor 2 are arranged on the base plate, an output shaft of the stepping motor is in power connection with a ball screw 26 through a coupler 21, the ball screw is mounted on a first bearing mounting seat 25 and a second bearing mounting seat 29 through a first bearing 24 and a second bearing 30, the first bearing mounting seat and the second bearing mounting seat are fixed on the base plate, a nut 27 is mounted on the ball screw, a linear guide 15 is arranged between the beam expander and the second beam expander objective, a slider 14 is arranged on the linear guide, the first beam expander objective is fixed on the slider, and the first beam expander objective is connected with the nut through a transfer block 28, the limiting sensor is fixed on the beam expanding ocular, and the driving control circuit is respectively connected with the stepping motor and the limiting sensor.

Different screw pitches are arranged on the ball screw. The adjustment accuracy of the divergence angles of various laser beams is met by selecting according to the actual detection target.

Referring to fig. 1 and 2, in the present embodiment, the driving control circuit 1 controls the forward rotation and the reverse rotation of the stepping motor 20, and receives the position feedback signal of the limit sensor 2, thereby forming a closed-loop control. The stepping motor is fixed on the bottom plate through a stepping motor mounting seat 19. The bottom plate has upper surface and lower surface, and wherein drive control circuit, beam expanding eyepiece, second beam expanding objective, linear guide fix the upper surface at the bottom plate, and step motor mount pad, first bearing mount pad, second bearing mount pad are fixed at the lower surface of bottom plate.

In this embodiment, the ball screw is provided with a first bearing and a second bearing, the first bearing is mounted with the first bearing mounting seat through a first bearing pressing ring 23, and the second bearing is mounted with the second bearing mounting seat through a second bearing pressing ring 32. The ball screw is axially limited by the fastening nut 22 and the snap spring 31.

Referring to fig. 2, the expander eyepiece lens 16 is fixedly mounted in the expander eyepiece holder by an expander eyepiece washer 18 and an expander eyepiece clamping ring 17.

Referring to fig. 2, in the present embodiment, the first expander objective lens 9 is fixedly mounted in the first expander objective lens holder by a first expander objective lens gasket 12 and a first expander objective lens clamping ring 13. The second expander objective lens 8 is fixedly mounted in the second expander objective lens holder through a second expander objective lens gasket 11 and a second expander objective lens clamping ring 10. In this embodiment, the number of the second beam expanding objective lenses is one, and may be multiple. The number of the second beam expanding objective lenses is selected according to actual detection targets, so that the imaging quality is better.

In this embodiment, the limit sensor is secured to the beam expanding eyepiece frame by two limit sensor lock rings 3. The surface of the limit sensor is provided with external threads, the lock ring of the limit sensor is provided with internal threads, and the lock ring of the limit sensor is in threaded connection with the limit sensor.

The driving control circuit 1 controls the stepping motor 20 to rotate forwards or backwards according to the position signal fed back by the limiting sensor 2, the ball screw 26 drives the screw 27 to do linear reciprocating motion, and the screw drives the first beam expanding objective lens 5 to move forwards and backwards along the linear guide rail 15, so that the distance between the first beam expanding objective lens and the beam expanding ocular lens 4 and the distance between the first beam expanding objective lens and the second beam expanding objective lens 6 are changed, and the purpose of changing the divergence angle of the laser beam expanding objective lens is achieved.

In this embodiment, the drive control circuit can also be connected with an upper computer for controlling, and the beam expander can continuously adjust the divergence angle of the laser beam by installing a control program on the upper computer.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.

Claims

1. Beam expander lens with adjustable divergence angle, comprising a base plate (7), characterized in that: the bottom plate is provided with a drive control circuit (1), an expanded beam objective (4), a first expanded beam objective (5), a second expanded beam objective (6), a stepping motor (20) and a limiting sensor (2), an output shaft of the stepping motor is in power connection with a ball screw (26) through a shaft coupling (21), the ball screw is installed on a first bearing installation seat (25) and a second bearing installation seat (29) through a first bearing (24) and a second bearing (30), the first bearing installation seat and the second bearing installation seat are fixed on the bottom plate, a screw nut (27) is installed on the ball screw, a linear guide rail (15) is arranged between the expanded beam objective and the second expanded beam objective, a sliding block (14) is arranged on the linear guide rail, the first expanded beam objective is fixed on the sliding block, and the first expanded beam objective is connected with the screw nut through a transfer block (28), the limiting sensor is fixed on the beam expanding ocular, and the driving control circuit is respectively connected with the stepping motor and the limiting sensor.

2. The beam expander of claim 1, wherein: the beam expanding eyepiece lens (16) is fixedly arranged in the beam expanding eyepiece lens frame through a beam expanding eyepiece gasket (18) and a beam expanding eyepiece clamping ring (17).

3. The beam expander of claim 2, wherein: the first expanded beam objective lens (9) is fixedly arranged in the first expanded beam objective lens frame through a first expanded beam objective gasket (12) and a first expanded beam objective clamping ring (13).

4. The beam expander of claim 3, wherein: and a second expanded beam objective lens (8) is fixedly arranged in a second expanded beam objective lens frame through a second expanded beam objective gasket (11) and a second expanded beam objective clamping ring (10).

5. The beam expander of claim 4, wherein: the stepping motor is fixed on the bottom plate through a stepping motor mounting seat (19).

6. The beam expander of claim 5, wherein: the limiting sensor is fixed on the beam expanding eyepiece lens frame through two limiting sensor lock rings (3).

7. The beam expander of claim 6, wherein: the first bearing is installed with the first bearing installation seat through a first bearing pressing ring (23), and the second bearing is installed with the second bearing installation seat through a second bearing pressing ring (32).

8. The beam expander of claim 7, wherein: the ball screw is axially limited through a fastening nut (22) and a clamp spring (31).

9. The beam expander of claim 1, wherein: different screw pitches are arranged on the ball screw.

10. The beam expander of claim 1, wherein: the second beam expanding objective lens is multiple.