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Introduction Of Development Process Of Laser Marking Head

Mar 09, 2020

Development path

Since 1995, in the field of laser marking, it has gone through the era of large format, mirror rotation and galvanometer. The control method has also completed a series from software direct control to upper and lower computer control to real-time processing and time-sharing multiplexing evolution. Today, the emergence and development of semiconductor lasers, fiber lasers, and even UV lasers have brought new challenges to optical process control. Galvanometer laser marking heads (galvanometer scanning systems) are the latest products. In 1998, the large-scale application of galvanometer scanning systems in China began. The so-called galvanometer can also be called an ammeter. Its design idea completely follows the design method of the ammeter. The lens replaces the meter needle, and the signal of the probe is replaced by a computer-controlled DC signal of -5V-5V or -10V-10V. To complete the scheduled action. Same as the rotating mirror scanning system, this typical control system uses a pair of folding mirrors. The difference is that the stepper motor that drives the lens is replaced by a servo motor. In this control system, the use of position sensors The design ideas of the negative feedback loop further ensure the accuracy of the system, and the scanning speed and repeat positioning accuracy of the entire system reach a new level.

Laser marking head principle

Galvanometer scanning marking head is mainly composed of XY scanning mirror, field lens, galvanometer and computer controlled marking software. The corresponding optical components are selected according to the different laser wavelengths. Related options include laser beam expanders, lasers, and more. The working principle is that the laser beam is incident on two mirrors (scanning mirrors), and the reflection angle of the mirrors is controlled by a computer. These two mirrors can be scanned along the X and Y axes, respectively, so as to achieve the deflection of the laser beam, and The laser focusing point of a certain power density moves on the marking material according to the required requirements, thereby leaving a permanent mark on the surface of the material. The focused spot can be circular or rectangular. The principle is shown in the figure on the right. In galvo scanning systems, vector graphics and text can be used.

This method uses the graphics software processing method in the computer, which has the characteristics of high drawing efficiency, good graphics accuracy, and no distortion, which greatly improves the quality and speed of laser marking. At the same time, the galvanometer type marking can also use the dot matrix marking method. This method is very suitable for online marking. Depending on the production line at different speeds, one scanning galvanometer or two scanning galvanometers can be used. Compared with array marking,

It can mark more dot matrix information, which has a greater advantage for marking Chinese characters. Due to its wide application range, galvanometer scanning marking can perform vector marking and dot matrix marking, the marking range is adjustable, and it has fast response speed and high marking speed (hundreds of characters can be marked per second) The advantages of high marking quality, good optical path sealing performance, and strong environmental adaptability have become mainstream products, and are considered to represent the development direction of laser marking in the future, and have broad application prospects.

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Due to its wide application range, galvanometer scanning marking can perform vector marking and dot matrix marking, the marking range is adjustable, and it has fast response speed and high marking speed (hundreds of characters can be marked per second) The advantages of high marking quality, good optical path sealing performance, and strong environmental adaptability have become mainstream products, and are considered to represent the development direction of laser marking in the future, and have broad application prospects.


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