| 摘要 |
PURPOSE:To attain the low cost for the titled device by sharing a laser beam source, a signal detection section and a system control section in common to the plural sets of optical discs, optical heads and carrying bases. CONSTITUTION:The optical disc 1 is driven by a rotary shaft 2 and a rotary driver 3 to the required number of revolutions, a laser beam is irradiated to the disc 1 through the optical head 4 to record and reproduce the information. The laser beam is irradiated from the laser beam source and a signal detection section 20 to the optical head 4, reaches the signal recording face of the disc 1 via a reflecting mirror 7, the carrying base 5 and the optical head 4 through an optical path (a), the reflected light from the face goes reversely and returns to the signal detection section 20, to obtain various control signals and information signals. The information is recorded and reproduced to the disc 11 similarly. The entire system is controlled by a system control section 21 and reflection mirror drivers 8, 18 apply position control to reflection mirrors 7, 17 to attain recording and reproduction of free information to the discs 1, 11. |
