Overlay recording prevention device for optical disc apparatus

Details Overlay recording prevention device for optical disc apparatus Overlay recording prevention device for optical disc apparatus

1983-03-09

1986-02-11

Cardillo, Jr., Raymond F.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 54, 369 58, 369106, 369116, G11B 2112

Patent

active

045702519

ABSTRACT:
An overlay recording prevention device for an optical disc apparatus detects a signal corresponding to a recording pit of a recorded track. This signal is detected from a photoelectric signal of an optical head when a tracking error occurs in the recording mode and a beam spot is shifted onto an already-recorded track. A high-level recording laser beam is stopped in response to this detection signal.

REFERENCES:
patent: 4145758 (1979-03-01), Drexler et al.
patent: 4308612 (1981-12-01), Miyauchi et al.
patent: 4363116 (1982-12-01), Kleuters et al.
patent: 4494226 (1985-01-01), Hazel et al.
Japanese abstract 55-89920; 8.7, 1980; 8 P 30.

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