Galvanometer: working principle of Laser Galvanometer

The core of laser marking equipment is laser marking control system and laser marking head. Therefore, the development process of laser marking is the development process of laser marking control system and laser marking head.

Since 1995, the field of laser marking has experienced the era of large format, rotating mirror and galvanometer, and the control mode has also completed a series of evolution from direct software control to upper and lower computer control to real-time processing and time-sharing multiplexing. Nowadays, the emergence and development of semiconductor lasers, fiber lasers and even ultraviolet lasers pose new challenges to optical process control. Galvanometer laser marking head (galvanometer scanning system) is the latest product.

In 1998, the large-scale application of galvanometer scanning system in China began. The so-called galvanometer can also be called ammeter. Its design idea completely follows the design method of ammeter. The galvanometer needle is replaced by the galvanometer lens, and the probe signal is replaced by the - 5v-5v or - 10V - + 10V DC signal controlled by the computer to complete the predetermined action.

Small laser engraving machine

 

The typical control system is the same as the rotating mirror scanning system. The difference is that the stepper motor driving the lens is replaced by the servo motor. In this control system, the use of position sensor and the design idea of negative feedback loop further ensure the accuracy of the system, The scanning speed and repeat positioning accuracy of the whole system reach a new level. Scanning marking of galvanometer

The scanning head of galvanometer is mainly composed of XY scanning mirror, field mirror, galvanometer and computer controlled marking software. According to the different wavelength of laser, the optical components are selected. The related options also include laser beam expanding mirror, laser, etc.

The principle of the laser beam is to incident the laser beam to two mirrors (scanning mirrors), and control the reflection angle of the mirrors by computer. The two mirrors can be scanned along the X and Y axes respectively, thus achieving the deflection of the laser beam, so that the laser focusing with certain power density moves on the marking material according to the requirements, so as to leave permanent marks on the surface of the material, The spot focused can be circular or rectangular, and its principle is shown in the right figure. In the galvanometer scanning system, vector graphics and words can be used. This method adopts the graphic software in computer to deal with the graphics. It has the characteristics of high drawing efficiency, good graphics accuracy and no distortion, which greatly improves the quality and speed of laser marking.

wood laser engraving machine

At the same time, the vibrating mirror marking can also be marked by lattice type. This method is very suitable for online marking. According to the production line with different speed, one scanning galvanometer or two scanning galvanometer can be used. Compared with the array marking mentioned above, more dot matrix information can be marked, which has greater advantages for marking Chinese characters.

Because of its wide application range, galvanometer scanning marking can be used for vector marking and dot matrix marking. The marking range is adjustable, and it has the advantages of fast response, high marking speed (hundreds of characters per second clock), high marking quality, good optical sealing performance and strong adaptability to environment. It is considered to represent the development direction of laser marking in the future, It has a broad application prospect.

Laser marking head

The double beat head (double head, double head) consists of two scanning heads. After one laser beam enters the marking head, it is divided into two laser beams through optical combination. The special double head marking software controls the double end work respectively. The marking efficiency is twice of that of single head, and the marking area is twice of that of single head, especially suitable for places requiring fast and large-scale marking. The technical parameters of the double dozen header are the same as the above single dozen header, but the marking area is twice the single marking head. For example, the marking area of the single beat header is 100x100mm, and the marking area of the corresponding doubles header is 200x100mm.

optical element

We optimize and debug all optical elements accurately to ensure the best focusing quality and stable process parameters. We offer compact design objective, including the adapter of standard objective, and optical elements of various wavelengths, power density, focal length and field of view.

Digital laser head

Compared with the traditional analog marking head, digital marking head has the characteristics of small volume, fast scanning speed and strong anti-interference capability. It is mainly used in fiber Laser marking machine, end pump solid Laser marking machine and flight Laser marking machine.