Coaxial Conformal Focusing System

Abstract

The invention discloses a coaxial profile-followed focusing system which can ensure an optimal focusing state, does not need early modeling and is high in closed-loop tracking control and response speed. The coaxial profile-followed focusing system comprises a beam expanding device, a beam splitter, a beam converging device, a photoelectric detector, a servo mechanism and a closed-loop control circuit. The beam converging device and the beam expanding device are coaxial. The servo mechanism drives the beam expanding device, the beam splitter and the photoelectric detector to move back and force in the axis direction of the beam expanding direction and the axis direction of the beam converging device so that focusing state error value compensation can be conducted. According to the coaxial profile-followed focusing system provided by the invention, light rays are gathered on the surface of a workpiece through the beam expanding device and the beam converging device which are arranged coaxially, scattered light transmitted reversely is generated on the surface of the workpiece, converged through the beam converging device and reflected to the photoelectric detector through the beam splitter. The focusing state of a converged light beam on the surface of the workpiece is determined by the closed-loop control circuit according to the light intensity received by the photoelectric detector, and the servo mechanism is driven to move back and forth to compensate the focusing state error value till the error value is zero.

Description

Technical field [0001] The invention relates to the technical field of laser processing, in particular to a coaxial conformal focusing system. Background technique [0002] With the unprecedented development of laser technology, lasers have been widely used in processing fields, such as laser cutting, welding, marking, and cleaning. In practical applications, a focusing system is usually used to focus the laser beam to increase the light intensity per unit area, so that the workpiece can be processed more effectively. [0003] However, the relative position of the focus point and the surface of the processed workpiece directly affects the final processing effect. Therefore, the surface of the workpiece is usually as flat as possible to be suitable for laser processing. [0004] Often the surface of most workpieces cannot be guaranteed to be absolutely flat. Therefore, those skilled in the art have adopted a variety of solutions to this problem: [0005] 1. Fix the relative position o...

AI Technical Summary

Problems solved by technology

[0008] To sum up, Option 1 and Option 2 require the surface of the workpiece to be processed to be flat, which is only applicable to specific processing scenarios, and is powerless for workpieces with complex surfaces.

Although the third option has a wide range of applications, it requires preliminary modeling work, and the processing process is in an open-loop control state, and there is no feedback process for the focusing state

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