Optical disk apparatus

Details Optical disk apparatus Optical disk apparatus

1983-12-15

1986-09-09

McElheny, Jr., Donald

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 50, 369 58, G11B 700

Patent

active

046113177

ABSTRACT:
An optical disk apparatus has an optical disk for recording data into a recording area on an optical disk and reproducing the recorded data from the recording area. The optical disk is provided at the center with a first section with the same reflectivity as that of the recording area and a second section with a different reflectivity from that of the recording area. A photosensor sense detects the first section and produces a signal representing a reflectivity on the first section. The reflectivity data obtained from the signal level is used for controlling a gain of the servo system according to the reflectivity data.

REFERENCES:
patent: 4475182 (1984-10-01), Hosaka
patent: 4494154 (1985-01-01), Akiyama
patent: 4497047 (1985-01-01), Fujiie et al.

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