At present, the laser marking of their work can be divided into cover mode marking, marking array scanning and marking.

1. Marking cover model

Cover model, also known as marking projection-marking. Cover model by the laser marking system, mask and imaging lens, its working principle, after the laser beam expanding telescope, even in the prior projection to do a good job of on-board mask, carved from the empty part of the light transmission. Mask-board graphics imaging to work through the lens (focal plane). Each pulse can usually a markers. By laser radiation on the surface of the material was rapidly heated vaporization or chemical reaction occurred in the color change could be formed to identify a clear marker. Marking the general pattern of cover used YAG lasers and CO2laser. Markingcover model of the major advantages of a laser pulse will be able to play once a complete, including several symbols of the mark, the marking speed. For a large number of products, in a direct line marking. The disadvantage is that the flexibility of poor marking, low energy utilization.

It is the use of several small laser pulse fired at the same time, the mirror and focusing lens, so that the number of laser pulses in the marking material on the surface ablation (melt) out of uniform size and depth of small pits, each of the characters, These patterns are small round pits and posed, generally 5 horizontal strokes, vertical strokes of 7 points, 5 ¡Á 7 to form the array. Array marking the general use of low-power RF CO2 laser, marking its highest speed of up to 6,000 characters / Miao, has become the subject of high-speed online play ideal, the drawback is marked only dot-matrix characters, and can only be achieved 5 ¡Á 7 resolution, the Chinese could do nothing.

     2. Scan-marking

Scan-marking system is composed of computers, laser scanning and XY bodies of three parts, and its working principle is the need to hit the target information into the computer, the computer program designed in accordance with the prior laser scanning XY and institutions, so that after a special optical system transformation The high-energy laser point in the processing scan movement on the surface to form a tag.

XY scan usually have the structure of two forms: One is the mechanical scanning, and the other is the galvanometer scanning.

(1) mechanical scanning

Mechanical scanning system, marking is not used by changing the angle of rotation of the mirror to move the beam, but by the mechanical method of mirror XY coordinates for the translation, thus changing the laser beam to reach the location of the workpiece, the marking system XY Scanning is usually modified plotter. The course of their work: a laser beam through mirror ¢Ù, ¢Ú turning point in the light path, and then after a light pen (Lens) ¢Û reach the role of the workpiece being processed. One pen plotter arm with a mirror only ¢Ü ¢Ù ¢Ú and along the X axis movement back and forth; ¢Û light pen, together with its top of the mirror ¢Ú (both fixed together) only along the Y axis movement. In the computer under the control of the (general control of the output signal through parallel port), light pen in the Y direction of the campaign arm in the pen with the X direction of movement synthesis, laser output can reach any point inside the plane, in order to carve arbitrary standard graphics and Text.

(2) galvanometer scanning

Galvanometer scanning system of marking by laser, XY deflection mirror, focusing lens, computer, etc.. Its working principle is to a laser beam incident upon the two mirror (mirror), with computer-controlled mirror reflection of the point of view, the two mirrors can be along the X, Y axis scanning in order to reach the deflection of a laser beam, so that A certain power density of the laser focus on marking materials in accordance with the requirements of the required movement, which in the material on the surface of the permanent marker, the focus spot can be round or rectangular.

Galvanometer in the marking system, can be used vector graphics and text, an approach that uses computer graphics software for handling graphics, mapping with high efficiency and accuracy of graphics, without distortion, and other characteristics of a great deal to improve Laser quality and speed of the subject. At the same time, galvanometer-marking can also dot matrix marking methods used in this way for online marking is applicable, according to the different speed of the production line can be used to scan one or two galvanometer scanning galvanometer, with the foregoing Array of marking compared to more marked matrix, marking the Chinese characters have a greater priority.

Galvanometer scanning-marking system for the general use of light Pumps work for the 1.06¦Ìm wavelength of Nd: YAG laser, the output of 10 ~ 120W, laser output can be continuous, it could be a switch Q modulation. In recent years, the development of RF CO2 laser, has also been used to galvanometer scanning laser marker.