Laser marking machine helps the laser engraving business of mobile phone back shell

Laser marking is a type of laser processing. In the current domestic market, laser marking machines may be the most widely used laser equipment in the market. Laser marking is to use laser to engrave permanent

marks on the surface of various materials. The effect of marking is to expose the deep material through the evaporation of the surface material, or to 'carve' traces through the chemical and physical changes of the surface material by light energy, or to burn off part of the material through light energy to show the required carving

The graphics and text of the eclipse.

　　 At present, there are three basic methods for laser marking: mask marking method, dot matrix marking method, Linear scan marking method. Common laser marking equipment consists of five parts:

　　 (1) Laser: It generates high-energy pulsed laser beam or continuous laser beam.

　　 (2) Optical system: It includes focusing lens group, optical fiber, galvanometer scanner, acousto-optic deflection modulator. It is used to direct and focus the laser beam on the processed surface of the marked workpiece to produce characters or patterns in the form of dots and lines.

　　 (3) Computer and software and hardware control system.

　　 (4) Auxiliary systems: such as laser cooling system and auxiliary blowing circulation system.

　　 (5) Workbench and host.

< br />　　The classification of laser marking machine can be divided mainly from the laser and scanning method.

　　 (1) Divided by the working mode of the laser

　　 Divided by the working mode of the laser Marking machine can be divided into continuous type and pulse type Two kinds.

　　 mask mode laser marking machine is a kind of pulse type, this method is characterized by fast speed, the amount of pulse in one second can be very high, that is to say, one second There are more workpieces marked by the clock, and the work efficiency is higher. The disadvantage is that the content of the mark is single, the change is troublesome (the template needs to be re-made), the mark content is not clear, and the depth is not enough. There are many applications in the electronics industry.

　　The continuous type is the most widely circulated on the market. It is characterized by diversified marking content, easy modification, clear marking content, and a certain depth. The disadvantage is that the speed is relatively slow.

　　 (2) According to the type of laser

　　 From the type of laser, it can be divided into two types: solid and gas.

　　The solids are mainly YAG, YVO4, etc., and the gas is mainly CO2. The solid is mainly for metal marking, and it can also process some non-metals.

　　The processing objects of the gas marking machine are mainly non-metals, including wood, leather and so on. There are two types of solids: lamp pumping and semiconductor pumping.

　　 (3) Divided by the wavelength of the laser

　　 is divided from the wavelength of the laser, can be divided into infrared light, visible light, ultraviolet light and so on. The YAG with a wavelength of 1064nm and the CO2 marking machine with a wavelength of 10600 are all infrared processing equipment. On the basis of

of 1064nm, the green light of 532nm is obtained by multiplying the frequency, which belongs to the range of visible light. On the basis of 532nm and 1064nm, frequency doubling and sum frequency technology can be used to generate 355nm and 266nm ultraviolet laser, which is suitable for fine processing.

　　 (4) Divided by scanning mode

　　 Divided by scanning mode can be divided into two types: static light path and moving light path. The so-called static light path means that the workpiece is driven by the worktable for scanning and characterization. The marking speed in this way is quite slow, especially when the workpiece body

is large and heavy. Therefore, in addition to some equipment that does not require speed and marking and cutting, it has basically withdrawn from the laser marking market. The advantage is that the size of the marking points is relatively uniform. If factors such as laser energy fluctuations are excluded, the points engraved by this scanning method are consistent everywhere in the plane.

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