Laser Television Signal Analysis And High Speed Scanning System Research

Since the learned man of the former Soviet Union academy of sciences physics had researched the institute of laser television to the success, it is difficult to practicability because the laser sweep unit accuracy demand and the laser instrument luminous efficacy and the great limit of electricity work loss. Going into the 90's, with the technique development of the microelectronics and super precision work technique and solid body laser technique, laser television achieves into for the sake of the probability.In the laser television, it is very important for the achievement of the laser television to the laser scanning system stability and the exact quality. The laser scanning system development orientation approbatory possesses two: one is light engine scanning the other is fame scanning. Light engine scanning is in the way of spurring reflects to circle with the machine unit. The rule is easy, sweep range greatly, yet the problem is that the machine system is the bad accuracy and the stability is harder domination and so on. Fame scanning is the action that utilizes the ultra-audible sound to focus the laser, that causes the light beam happen yawing to achieve scanning, it is controlled easily, the scanning speed quickly, the architecture is simply, yet the defect is that the light beam sweep angle is little. Now, with the development of the high speed tiny generator, Particularly, the permanent magnetism direct current generator without brush, causing electrical machinery operating speed and stability wholly obtain the very great raise, simultaneous with subdivided drive technique in the wake of the stepper motor develops further and improving, causes that stepper motor step angle is tiny and uniform, and runs more smooth and steadily. It is the dependable technique guarantee of laser television scanning system at ahigh speed.My research item - the laser scanning system at a high speed utilizes permanent magnetism direct current generator without brush and the stepper motor to drive reflector achieving television video scanning. Permanent magnetism direct current generator without brush drives the reflector with ten surfaces to line scanning, and the stepper motor drives single reflector to achieve television video field scanning. It is tall in the scanning speed, and the scanning speed is shifted, and ruing smooth and steadily, the high accuracy and so on, it can extensively use in the machining, the multi-medium enjoying, arena ornament and so on, it has the wide marketplaceforeground.Firstly, the thesis is begun with the analysis of the TV signal, on the base of the television video signal compendium, designing the laser television scanning system at a high speed composition and scheme, designing the visual angle of the line scanning and field scanning, and the step angle of the stepper motor. On the base, with the demand of the TV video signal, designing the speed of the motor and revolving reflector figure. In the laser television line scanning system, by means of the machine property of the direct current generator, and thedemand of the laser television line scanning, choosing the rapid scheme of permanent magnetism the direct current without brush and on this base designing the firm velocity electric circuit. In the field scanning system, by the running property and the mode of energize of the stepper motor, and the demand of the laser television field scanning, researching the subdivided drive of the stepper motor, and optimizes the subdivided drive scheme, and obtain the pole current formula of the uniform subdivided drive in the stepper motor. On this base, introducing the stepper motor subdivided drive circuit simply.