Optical information recording and reproducing apparatus

Details Optical information recording and reproducing apparatus Optical information recording and reproducing apparatus

1988-05-20

1989-12-26

Stephan, Steven L.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369124, 250201, G11B 700, H05J 4014

Patent

active

048902748

ABSTRACT:
In an optical information recording and reproducing apparatus for recording and reproducing information by controlling the focus of an optical system for condensing and projecting lights of a light source onto a recording medium, an offset part produced in case the lights are condensed and projected in a focus servo state in data writing regions in the recording medium and prepit regions which are adjacent to the data writing regions and in which discriminating codes are written is detected in the respective format regions by a format detecting means and an offset fluctuation controlling voltage is impressed on the basis of this detecting signal to inhibit the fluctuation of the offset in the respective regions of different formats.

REFERENCES:
patent: 4357696 (1982-11-01), Bierhoff
patent: 4417330 (1983-11-01), Hazel et al.
patent: 4446546 (1984-05-01), Miller
patent: 4475182 (1984-10-01), Hasaka
patent: 4503324 (1985-03-01), Yokota
patent: 4607157 (1986-08-01), Millos
patent: 4611317 (1986-09-01), Takeuchi
patent: 4613964 (1986-09-01), Ichikawa
patent: 4658391 (1987-04-01), Nozu
patent: 4663750 (1987-05-01), Hamanaka
patent: 4700056 (1987-10-01), Silvy et al.
patent: 4701603 (1987-10-01), Dakin et al.

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