Laser plastic micro-welding method based on LCD space light modulator and device

Abstract

The invention relates to the field of plastic welding, in particular to a laser plastic micro-welding method and a device based on a crystal space photomodulator. The invention is suitable for the fast welding between plastic materials, in particular to the welding of plastic micro-apparatus. The device includes a laser, an astigmatism system, a crystal space photomodulator, a computer and a focusing system. The micro-welding method includes the following steps of: utilizing the computer to preciously control a phase diagram displayed on the crystal space photomodulator to lead a laser beam to be modulated and shaped after passing through the crystal space photomodulator and obtain a facular with the shape consistent to a welding line after assembled by the focusing system; the facular irradiates on a workpiece so as to realize the synchronous welding of the two plastics. The invention integrates the laser beam shaping technology to the plastic transmission micro-welding technique, thus being capable of adapting the synchronous welding of the welding lines of different shapes and realizing low cost and large batch for welding the micro-apparatuses; besides, the technique is simple and the consistency is good; the invention is suitable for automatization production.

Description

technical field [0001] The present invention relates to the field of plastic welding, in particular to a laser plastic micro-welding method and device based on a liquid crystal spatial light modulator, which is suitable for fast welding between plastic materials, especially for plastic micro-device welding, and can ensure micro-welding High efficiency and mass production. Background of the invention [0002] Traditional plastic welding techniques include: ultrasonic welding, vibration welding, hot plate welding, etc. The advantages of laser plastic welding are less resin degradation, less debris, and no pollution during the welding process due to the non-contact nature of the laser. Another major advantage is that laser plastic welding produces less vibration stress and thermal stress than other connection methods, which greatly improves the service life of products or internal components of the device, so laser plastic welding is more suitable for electronic sensors that a...

AI Technical Summary

Problems solved by technology

[0004] 1. It is not possible to weld micro-fine parts;

[0005] 2. There is a relatively high rate of relative movement between the light source and the workpiece to be welded, which is likely to cause warping and deformation of the plastic part;

[0006] 3. The intensity distribution of the laser beam is Gaussian, resulting in irregular melting;

[0007] 4. It is difficult to make masks, and different masks need to be made for different welds, and the cost is high

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