| 摘要 |
PURPOSE:To accurately control positioning of a flexible semitransparent film specular surface by providing a sensing mechanism, which detects the position of the semitransparent film specular surface to generate a position signal, and a feedback mechanism which outputs a corrected control signal to a three- dimensional display mechanism. CONSTITUTION:Since a semitransparent film specular surface 12 is directly proportional to the pressure difference, the pressure difference is measured to obtain a variable and the motion of the semitransparent film specular surface 12 is indirectly measured by this variable. When it is inputted to the plus terminal of an adder 36, the instruction signal which indicates a desired position of the semitransparent film specular surface 12 is inputted from a computer system 22 through a conductor 26, and the adder 36 outputs the deviation of the position signal, which passes a conductor 42, from the instruction signal passing the conductor 26 to generate an error signal through a conductor 44, and this error signal is fed back from a compensating circuit 38 to a solenoid 18 of a speaker part 14 through an amplifier 40. Thus, the position of the semitransparent film specular surface is controlled accurately synchronously with projection of an image on the flexible semitransparent film specular surface. |
