Factors of precision of small laser marking machine

In the modern processing industry, UV laser cutting machines (usually referring to laser equipment integrated with UV nanosecond lasers) are called cold laser micro-precision machining systems. Its working principle is to irradiate the surface of the material with a 355nm laser wavelength laser, and the molecules of the material form cutting, etching, marking, etc. Commonly used in micro-precision laser processing systems, such as PCB laser cutting, sub-board, FPC laser cutting, camera module laser cutting, fingerprint recognition chip laser cutting, silicon wafer laser cutting, ceramic laser cutting, thin metal material laser cutting, PET/ PI film laser cutting, etc.

The advantages of the UV laser micro-precision machining system are that the heat affected area is small, the spot is small, the beam quality is high, the processing quality is high, and the precision is high. . So what are the reasons that affect the accuracy of the UV laser cutting machine?

Laser: The laser is the Z core device in the UV precision micromachining system, which directly affects the accuracy of laser processing, such as light size, beam quality, repetition frequency, spot roundness, The pulse width directly affects the accuracy of the laser output. The power parameters of each laser are different, and the reference parameters of each company are different, and the corresponding accuracy varies greatly.

Galvanometer: Galvo is an important core device in the external optical path system of the laser. The quality of the galvanometer is reflected in factors such as speed, spot roundness, and spot deflection accuracy.

Field lens: The field lens is also called a lens. The scanning range of the field lens directly affects the accuracy of the light spot. The size of the light plate determines the thermal influence in the process of processing the material. Area, for example, etching on glass coating, the accuracy of a single scribing varies from 5-20 microns, the main factor depends on the size of the field lens, usually the lens used for cutting is in the range of 30-40mm , while smaller line widths on glass coatings require 6-15mm lenses. The smaller the lens, the smaller the light spot, the smaller the thermal impact that can be achieved, and the higher the accuracy.

Linear motor: Linear motor affects the splicing accuracy. Generally, the Z large format of the processed material will be larger than the scanning range of the lens, so the camera will be used for identification, and the linear motor will be used for identification. For mobile splicing, the splicing accuracy of a good linear motor can be 1μm. For some materials that do not require splicing accuracy but only need spot accuracy, servo motors can be considered, which can save a large part of the cost.

Software control system: The software control system affects the repeatability of the whole machine, and it is necessary to continuously calibrate the machine through software control to ensure the precision of the whole machine. In comparison, software is often a part that is easily overlooked.