1. The principle of galvanometer is that when a position signal is input, the oscillating motor (laser galvanometer) will oscillate at a certain angle according to the conversion ratio between a certain voltage and an angle. The whole process adopts closed-loop feedback control, which is composed of five control circuits: position sensor, error amplifier, power amplifier, position discriminator and current integrator. The principle of digital laser galvanometer is to convert analog signals into digital signals based on the principle of analog laser galvanometer.

2. Application of galvanometer in marking industry: The galvanometer scanning marking head is mainly composed of XY scanning mirror, field mirror, galvanometer and computer-controlled marking software. Select the corresponding optical components according to the different laser wavelengths. Related options include laser beam expander, laser, etc.

3. Its working principle is that the laser beam is incident on two mirrors (scanning mirrors), and the reflection angles of the mirrors are controlled by a computer. These two mirrors can scan along the X and Y axes respectively, so as to achieve the deflection of the laser beam and make the laser focusing point with a certain power density move on the marking material as required, thus leaving a permanent mark on the surface of the material. The focused spot can be round or rectangular. In the galvanometer scanning system, vector graphics and characters can be used. This method uses graphics software in the computer to process graphics, which has the characteristics of high drawing efficiency, good drawing accuracy and no distortion, and greatly improves the quality and speed of laser marking.

4. In 1998, the large-scale application of vibrating mirror scanning system began to come in China. Its design idea completely follows the design method of ammeter, the lens replaces the watch hand, and the signal of the probe is replaced by the DC signal of-5V-5V or-10V-+10V controlled by the computer to complete the predetermined action. Like the rotating mirror scanning system, this typical control system adopts a pair of folding mirrors, but the difference is that the stepping motor driving this set of lenses is replaced by 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, and the scanning speed and repeated positioning accuracy of the whole system reach a new level.

5. Application of galvanometer scanning system in the field of laser soldering: The working principle is the same as that of galvanometer in marking application. Through the angular deflection of two galvanometer in X and Y axes, the laser beam is reflected to the processing surface through the beam expander lens, and the range of galvanometer reflecting the laser to the processing surface is the galvanometer scanning range. The solder joints and laser spots in this processing range can be effectively heated, and the laser spot movement required by different solder joints can be realized without relying on a two-dimensional moving platform. Because the deflection speed of the galvanometer is very fast, the laser spot movement between various solder joints is also very fast, far exceeding the moving speed of the conventional two-dimensional moving axis. On the premise of pre-coating solder paste, this function of moving laser spot at high speed can greatly improve the welding speed.