| 摘要 |
PURPOSE:To secure an economical processing for a position shift of a disk via the digital signal, by giving a circular working of an optical detector on the XZ surface and dividing the electric signal into the XZ component through an error detecting circuit. CONSTITUTION:A circular working is given to the optical detector 12 on the XZ surface, and the signal detected by a return light is turned into the C waveform by the waveform of J and through the envelope curve wave detecting circuit 4. The error detecting circuit 13 delivers the signals A and B by the pulse generator 22 and by the signal of the oscillator 8. The signal C of the circuit 4 is turned into the signals of D and F through the sample holding circuits F16 and F17 and by the signals A and B. The holding circuits 20 and 21 produce the signals F and G by the signals A and B. The gate circuit F18 receives the signals D and F to deliver the signal H. If the signal H contains the level ''1'', it means that the detector 12 is shifted to the direction Z. The driving circuits 14 and 15 shifts the detector 12 vertically and horizontally by such digital signal. As a result, a shift of a disk can be processed by a digital signal. |
