The Laser Galvanometer Scanning System Based On Digital Pid And Vector Font

Laser scanning is an important application of laser technology, because of its characteristics of high speed and high precision,it has been applied to all kinds of laser products, such as laser printers, laser phototypesetters and so on. The vibrating mirror scanning system is the main stream of laser scanning technology. The positioning control of vibrating mirror is high speed and high precision. It is very significant to design a scanning system that is based on vector font as the data source, digital PID as the control algorithm, STM32 as the core hardware.In this paper, the design of laser scanning control system is accomplished. The whole system is composed of the main controller, the X-Y driver circuit and feedback circuit, the power circuit, the serial communication circuit, the serial turn parallel circuit of CPLD and so on. Designing position-speed-current three closed-loops’ control in the main controller which STM32F103 VE is used as the control core. The control software of the host computer is written under the C++MFC development environment, which can output the control coordinates of graphic characters. MDK is used as the development tool, which makes the lower computer driver and the digital PID algorithm. Quartus2 is used as the development tool, which programs the CPLD program with VHDL language.The laser scanning system with high accuracy, high speed, high repeatability is achieved,through the design of hardware and software. After finishing the system design, the actual scanning experiment is carried out. Through analyzing and finding out the shortcomings of the whole system, the design of system is improved.