Multiple beam optical disk apparatus with multiple clock extract

Details Multiple beam optical disk apparatus with multiple clock extract Multiple beam optical disk apparatus with multiple clock extract

1990-10-31

1993-08-24

Young, W. R.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 4438, 369 54, 369106, 369124, G11B 700

Patent

active

052395294

ABSTRACT:
A disk recording and reproducing apparatus using two light beams has a disk driving section for loading a disk-shaped record medium having recording tracks and for rotating the disk-shaped record medium, an optical system having a light beam generating source, a light beam splitting device for splitting a light beam to provide at least a main beam and a sub beam, an optical path forming device for respectively causing the main beam and the sub beam to become incident on two adjacent recording tracks in the disk-shaped record medium loaded on the disk driving section and a photo-detecting device for detecting the condition that at least the sub beam from the disk-shaped record medium loaded on the disk driving section is affected by the recording track. Also provided is a disk rotation control section for controlling the disk driving section such that a relative moving speed of the recording track relative to the main beam incident on the recording track becomes constant, a recording operation section causing the information to be recorded on the recording track on which the main beam becomes incident, and a reproducing operation section for generating a read-out information signal based on a detected output of the sub beam from the photo-detecting device. The resultant read-out information signal is written in a memory at a rate corresponding to the read-out information signal and the read-out information signal written in the memory is read out again at a predetermined reading rate to generate a reproduced information output.

REFERENCES:
patent: 4283777 (1981-08-01), Curry et al.
patent: 4459690 (1984-07-01), Corsover et al.
patent: 4571716 (1986-02-01), Szerlip
patent: 4706235 (1987-11-01), Melbye
patent: 4841379 (1989-06-01), Akiyama
patent: 4853914 (1989-08-01), Okano et al.
patent: 4959825 (1990-09-01), Okano

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