Dynamic focusing optical system

Abstract

The utility model discloses a dynamic focusing optical system which comprises a galvanometer module and a field lens module and further comprises a dynamic beam expanding module, the dynamic beam expanding module comprises a drivable lens and a fixed lens, the drivable lens and the fixed lens are both arranged on a light path of incident light, the drivable lens is located in front of the fixed lens, and the fixed lens is located in front of the fixed lens. And the drivable lens can move back and forth along a light path of the incident light, the fixed lens is fixed, when the drivable lens is driven to move backwards, the incident light is diverged, and a light beam focus focused by the field lens module moves downwards, and when the drivable lens is driven to move forwards, the incident light is converged, and the light beam focus focused by the field lens module moves upwards. By moving the drivable lens, the machining depth of laser machining can be adjusted, precision machining in a small breadth can be achieved, and the position of a workpiece does not need to be moved.

Description

Technical Field

[0001] The utility model relates to the technical field of laser processing, in particular to a dynamic focusing optical system. Background Art

[0002] The laser processing process is a process of interaction between light and materials. It mainly uses the laser beam emitted by the laser to transmit through optical fiber and lens and then focus on the surface of the material. The material absorbs the laser energy to cause melting or even gasification, thereby achieving the purpose of material processing. It has the advantages of non-contact, fast processing speed, and high quality. It is widely used in cutting, welding, quenching, drilling and other processes. However, when processing workpieces of different materials, the laser usually needs to use different processing depths. The existing adjustment method is to move the workpiece, but some workpieces are large in size, and moving the workpiece is inconvenient, and the laser processing efficiency is low. Utility Model Content

[0003] In view of the problems existing in the above-mentioned prior art, the utility model aims to provide a dynamic focusing optical system, which can adjust the processing depth of laser processing and realize precision processing within a small area without moving the position of the workpiece.

[0004] In order to achieve the above-mentioned purpose, the utility model proposes a dynamic focusing optical system, including a galvanometer module and a field lens module, and also includes a dynamic beam expansion module, the dynamic beam expansion module includes a drivable lens and a fixed lens, the drivable lens and the fixed lens are both arranged on the optical path of the incident light, the drivable lens is located in front of the fixed lens, and the drivable lens can move forward and backward along the optical path of the incident light, the fixed lens is fixed, when the drivable lens is driven to move backward, the incident light diverges, and the focus of the light beam focused by the field lens module moves downward, when the drivable lens is driven to move forward, the incident light converges, and the focus of the light beam focused by the field lens module moves upward.

[0005] In the above scheme: the galvanometer module includes an X-axis galvanometer and a Y-axis galvanometer, both of which are plane reflectors with a maximum mechanical deflection angle of ±12.5°; the field lens module includes a focusing field lens with a focusing spot size of 14 to 16 um; the X-axis galvanometer and the Y-axis galvanometer are used to deflect and control the light beam in the x-direction and y-direction.

[0006] In the above scheme: the focal length of the drivable lens is F-113.2mm, and the focal length of the fixed lens is F147.2mm. The dynamic focusing optical system can move the drivable lens according to the required processing depth to achieve precision processing within a small area, and there is a processing depth range of 1mm without moving the position of the workpiece.

[0007] In the above scheme: the focal length of the drivable lens is F-60.7mm, and the focal length of the fixed lens is F121.4mm. The dynamic focusing optical system can move the drivable lens according to the required processing depth to achieve precision processing within a small area, and there is a processing depth range of 2.2mm without moving the position of the workpiece.

[0008] In the above scheme: the processing plane of the dynamic focusing optical system is 20mm×20mm, which is convenient for realizing precision processing within a small area.

[0009] The beneficial effects of the utility model are:

[0010] The drivable lens can be moved according to the required processing depth to achieve precision processing in a small area. Since the distance between the drivable lens and the fixed lens will change with the movement of the drivable lens, the angle of the incident light entering the field lens module will change, so the focus of the light beam focused by the field lens module will change. Therefore, the processing depth can be adjusted without moving the workpiece. Compared with the processing workpiece, the drivable lens is usually smaller in size and easier to move, so the dynamic focusing optical system can effectively improve the efficiency of laser processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0012] Example 1

[0013] A dynamic focusing optical system is mainly composed of a dynamic beam expansion module, a galvanometer module 3 and a field lens module 4. The dynamic beam expansion module includes a drivable lens 1 and a fixed lens 2.

[0014] The drivable lens 1 and the fixed lens 2 are both arranged on the optical path of the incident light, the drivable lens 1 is located in front of the fixed lens 2, and the drivable lens 1 can move forward and backward along the optical path of the incident light, while the fixed lens 2 is fixed. The focal length of the drivable lens 1 is F-113.2mm, and the focal length of the fixed lens 2 is F147.2mm.

[0015] The galvanometer module 3 includes an X-axis galvanometer and a Y-axis galvanometer, both of which are plane reflectors with a maximum mechanical deflection angle of ±12.5°. The light entrance diameter of the galvanometer module 3 is 14 mm. The X-axis galvanometer is used to deflect and control the light beam in the x direction, and the Y-axis galvanometer is used to deflect and control the light beam in the y direction.

[0016] The field lens module 4 includes a focusing field lens, the focal length of the focusing field lens is F65mm, the size of the focusing spot is 14-16um, specifically about 15um, and the focal plane can be moved by about 1mm.

[0017] When the drivable lens 1 is driven to move backward, the incident light diverges, and the focus of the light beam focused by the field lens module 4 moves downward. When the drivable lens 1 is driven to move forward, the incident light converges, and the focus of the light beam focused by the field lens module 4 moves upward. The dynamic focusing optical system can move the drivable lens 1 according to the required processing depth to achieve precision processing in a small area (20mm×20mm), and has a processing depth range of 1mm without moving the position of the workpiece.

[0018] Example 2

[0019] A dynamic focusing optical system is mainly composed of a dynamic beam expansion module, a galvanometer module 3 and a field lens module 4. The dynamic beam expansion module includes a drivable lens 1 and a fixed lens 2.

[0020] Both the drivable lens 1 and the fixed lens 2 are arranged on the optical path of the incident light, the drivable lens 1 is located in front of the fixed lens 2, and the drivable lens 1 can move forward and backward along the optical path of the incident light, while the fixed lens 2 is fixed. The focal length of the drivable lens 1 is F-60.7mm, and the focal length of the fixed lens 2 is F121.4mm.

[0021] The galvanometer module 3 includes an X-axis galvanometer and a Y-axis galvanometer, both of which are plane reflectors with a maximum mechanical deflection angle of ±12.5°. The light entrance aperture of the galvanometer module 3 is 20 mm. The X-axis galvanometer is used to deflect and control the light beam in the x direction, and the Y-axis galvanometer is used to deflect and control the light beam in the y direction.

[0022] The field lens module 4 includes a focusing field lens, the focal length of the focusing field lens is F136mm, the size of the focusing spot is 14-16um, specifically about 15um, and the focal plane can be moved by about 2.2mm.

[0023] When the drivable lens 1 is driven to move backward, the incident light diverges, and the focus of the light beam focused by the field lens module 4 moves downward. When the drivable lens 1 is driven to move forward, the incident light converges, and the focus of the light beam focused by the field lens module 4 moves upward. The dynamic focusing optical system can move the drivable lens 1 according to the required processing depth to achieve precision processing in a small area (20mm×20mm), and has a processing depth range of 2.2mm without moving the position of the workpiece.

Claims

1. A dynamic focusing optical system, comprising a galvanometer module (3) and a field lens module (4), characterized in that: The invention also comprises a dynamic beam expansion module, wherein the dynamic beam expansion module comprises a drivable lens (1) and a fixed lens (2), wherein the drivable lens (1) and the fixed lens (2) are both arranged on the optical path of the incident light, the drivable lens (1) is located in front of the fixed lens (2), and the drivable lens (1) can move forward and backward along the optical path of the incident light, and the fixed lens (2) is fixed and does not move; when the drivable lens (1) is driven to move backward, the incident light diverges, and the focus of the light beam focused by the field lens module (4) moves downward; when the drivable lens (1) is driven to move forward, the incident light converges, and the focus of the light beam focused by the field lens module (4) moves upward.

2. The dynamic focusing optical system according to claim 1, characterized in that: The galvanometer module (3) comprises an X-axis galvanometer and a Y-axis galvanometer, both of which are plane reflectors, and their maximum mechanical deflection angle is ±12.5°; the field lens module (4) comprises a focusing field lens, and the size of its focusing spot is 14-16 um.

3. The dynamic focusing optical system according to claim 1, characterized in that: The focal length of the drivable lens (1) is F-113.2 mm, and the focal length of the fixed lens (2) is F147.2 mm.

4. The dynamic focusing optical system according to claim 1, characterized in that: The focal length of the drivable lens (1) is F-60.7 mm, and the focal length of the fixed lens (2) is F121.4 mm.

5. The dynamic focusing optical system according to claim 3 or 4, characterized in that: The processing plane of the dynamic focusing optical system is 20 mm×20 mm.

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