The working principle of galvanometer laser marking machine

At present, the most widely used laser marking machines all use galvanometer scanning marking. This marking method can not only match a variety of laser light sources, but also can mark a variety of fine and complex patterns, which is widely used. Next, I will introduce the marking principle of the galvanometer laser marking machine to you.

The composition and working principle of the scanning marking system. The scanning marking system is composed of three parts: a computer, a laser and an XY axis scanning mechanism. The scanning marking process The first is to input the graphics, characters and barcodes that need to be marked into the computer through the marking system interface, and then the computer controls the operation of the software system according to the marking program to control the laser and the XY axis scanning mechanism. The high-energy laser points processed by the system are burned on the surface of the processed object to form markings. The computer controls the laser points to scan to achieve the required graphics and characters.

There are two structural forms of marking using the X-axis and Y-axis scanning mechanism: one is the working principle of mechanical scanning, the other is the working principle of galvanometer scanning .

The working principle of mechanical scanning marking is to realize scanning marking by translating the plane coordinate points of the X-axis mirror and the Y-axis mirror by means of mechanical transmission. It is not by changing the rotation angle of the mirror to change the laser light path so as to change the position of the laser beam on the workpiece to perform the entire plane scanning and marking, so the marking principle uses the X-axis and Y-axis scanning mechanism to move the plane. It uses the working principle of a plotter. Its working method is that the light path is turned by the reflection principle of the reflector, so as to change the direction of the laser light path, and then the laser is directed to the workpiece after being focused by the focusing lens. According to the working principle of the plotter: the mirror on the pen arm of the plotter scans back and forth along the X axis, while the mirror on the upper end of the light pen can only scan back and forth along the Y axis. Through the control process of the computer software program, the parallel port outputs control signals so that the movement of the light pen in the Y direction and the movement of the pen arm in the X direction are combined to scan and mark the entire plane. Point, so that you can print out how to need graphics and characters.

The composition of the galvanometer scanning marking system: it is composed of laser generator, X-axis Y-axis polarizer, laser focusing lens and computer and other main components. The working principle of galvanometer scanning marking is to shoot the laser beam onto two moving galvanometers, and through the program control of computer software, the two galvanometers move along the X axis and the Y axis respectively, so that the laser beam can be Scanning at any point on the plane, and the laser beam with a certain power density can mark the required graphics and characters on the marked material according to the preset marking graphics requirements, so as to burn the workpiece surface. In the marking system using the galvanometer method, vector graphics and characters can be used. This marking operation processing method uses the computer graphics processing software to carry out the marking of the graphics to be marked. The efficiency and precision of this laser marking and drawing method are very high, and it is not easy to cause image distortion, etc., which greatly improves the quality and marking speed of laser marking. At the same time, the galvanometer marking method also uses the dot matrix marking method. The combination of this marking method is very suitable for online marking in industrial production. According to different equipment on the production line and the working speed of each equipment A computer host can be used to control production, which greatly saves production costs. Furthermore, compared with the above-mentioned array marking system, this marking method can mark more dot matrix information, and for complex marking systems. The product of kanji characters realizes the possibility.

The laser used in the galvanometer scanning marking system is generally a continuous optical pump laser, and its output power varies, generally 10-120W, and the laser beam The output is continuous, and the laser can also be modulated using Q-switching.

The galvanometer scanning marking method is widely used. The range of laser marking and characters can be adjusted, and the response speed and marking speed are also very fast during the marking process, and hundreds of characters can be printed per second. This laser marking method has strong adaptability to the environment and so on. Many advantages of the laser have made this type of laser a mainstream product on the market and a benchmark for the development of laser marking machines. It has very broad application and development prospects in the future laser marking market.

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