Optical recording and reproducing apparatus

Details Optical recording and reproducing apparatus Optical recording and reproducing apparatus

1989-09-28

1992-12-01

Shaw, Dale M.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 54, 369 4425, 369 4434, G11B 700

Patent

active

051684888

ABSTRACT:
In an optical disk apparatus for recording and reproducing data using light beams, the light reflected from a record mark area provided on an optical disk is detected and the amplitude of the signal corresponding to the light is held; the record mark is composed of long pits and long unrecorded areas. This amplitude is compared with that of the signal relative to the light from a data recording area of the optical disk. If the comparison result has a predetermined relation between both signals, an output signal with a prescribed level is produced. This output signal is used to assure the quality of the recorded data.

REFERENCES:
patent: 4553228 (1985-11-01), Gerald et al.
patent: 4564929 (1986-01-01), Yonezawa et al.
patent: 4672596 (1987-06-01), Romeas et al.
patent: 4685096 (1987-08-01), Romeas

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