Uniform light spot surface scanning device of laser cleaning machine

Abstract

A uniform light spot surface scanning device of a laser cleaning machine comprises a laser output module (10), a gauss-flat top system, a gradually-changing rotating polygonal mirror (50), a drive motor (60) and a collimation focusing lens (70). The gauss-flat top system redistributes the energy of a gaussian laser beam emitted by the laser output module (10) and compresses the diameter of the laser beam at the same time, so that a laser beam with uniform energy is formed; the laser beam irradiates the gradually-changing rotating polygonal mirror (50); the gradually-changing rotating polygonal mirror (50) is driven by the drive motor (60) to rotate so as to make the laser beam form a space angle scanning beam; the space angle scanning beam is refracted by the collimation focusing lens (70) and then forms surface light spots on an object (80) to be cleaned.

Description

technical field [0001] The invention relates to a uniform spot surface scanning method and device for a laser cleaning machine. It is an optical system that transforms and shapes the laser beam with uneven energy distribution and spot-like spots into a laser spot with uniform energy distribution and surface scanning. Mainly used in laser cleaning or other laser surface treatment fields. Background technique [0002] Laser cleaning technology uses high-power density laser to directly irradiate the surface of the object, so that the coating, rust and oil stains attached to the surface evaporate, ablate or peel off instantly. In most cases, the output of the laser is a circular parallel beam with a Gaussian energy distribution. When the current laser cleaning machine scans, it usually uses a collimating focusing lens to directly focus the beam, so the energy of the laser spot on the surface of the object to be cleaned is also Gaussian, which makes the energy of the center of ...

AI Technical Summary

Problems solved by technology

The defect of the first linear scanning method is that when the moving speed of the worktable is uneven, it is easy to cause leakage or over-cleaning.

The defect of the second and third planar scanning methods is that the spot position on the target plane is distorted, and there is no linear correspondence, so it is difficult to correct only by the optical system and mechanical mechanism

At the same time, these three beam scanning methods all have control circuits, and the control, installation, complexity and reliability of the circuits need to be considered

And the galvanometer system is not suitable for places with harsh external environments (vibration, large changes in temperature and humidity)

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