Optical recording or reproducing apparatus

Details Optical recording or reproducing apparatus Optical recording or reproducing apparatus

1997-07-17

1998-09-08

Swann, Tod R.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369116, 369 58, G11B 700, H03G 912

Patent

active

058055592

ABSTRACT:
A laser power control circuit for controlling the laser power is provided in an automatic power control circuit of an optical disc device, an amplitude of an RF signal is examined by the LPC circuit, a control voltage to be applied to the APC circuit is generated, and feedback is applied to control the laser power and stabilize the RF signal level. By this, the reproduction can be stably carried out by even discs having different reflection rates, an improvement of the reproduction capability can be achieved, and a lowering of the optical output of the laser diode accompanied with aging and the lowering of the reproduction capability accompanied with the lowering of the optical output due to dust adhered to the pick-up can be prevented. Further, the laser power per se is controlled, so there is no effect on the band of the RF amplifier.

REFERENCES:
patent: 5042020 (1991-08-01), Endo
patent: 5250796 (1993-10-01), Taguchi et al.
patent: 5680382 (1997-10-01), Inoue

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