PURPOSE: To enable maximum reproducing output to be obtained by oscillating information tracks in synchronization to synchronizing signal and at the frequency integer times its synchronizing frequency.
CONSTITUTION: Light beam from a laser light source 53 is modulated by the signal train from an information source 59 and forms information tracks 52 on a recording medium 50. An oscillating signal generator 61 generates the oscillating signal synchronized to the synchronizing signal and at the frequency integer times the same and the deflecting angle of a mirror 55 is adjusted by this signal. Reproducing is performed in this way: The output of a photo detector 30 is demodulated 30 to reproduce the original signal; the reference wave of the same frequency and phase as those of the oscillating signal is generated by a counter 71 by using the synchronizing signal 72; the envelope signal obtained from an AM detector 33 is synchronously detected by this reference light and a mirror driving circuit 35 is driven by this. By controlling the position of the read-out sensor in this way, the maximum reproducing output may always be obtained.
TAKASUGI KAZUO
YONEZAWA SEIJI
KAMIYANAGI KIICHI
| JPS5068413A | 1975-06-07 | |||
| JPS49103515A | 1974-10-01 |