Access controlling device for use in an optical disk drive

Details Access controlling device for use in an optical disk drive Access controlling device for use in an optical disk drive

1991-12-18

1994-05-10

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4426, 369 4429, 369 4434, 369 54, G11B 700

Patent

active

053114906

ABSTRACT:
An optical disk drive which discriminates whether a light spot is incident on a groove or on an area therebetween by eliminating a pulse that appears in a binary envelope signal when the light spot passes a level section. The elimination is carried out based on an ODF section detecting signal, the ODF section detecting signal being a level section detecting signal which is produced by detecting a level section (ODF section) of the optical disk. The detection is carried out by differentiating an envelope signal, which is the envelope of an electric signal corresponding to the amount of light reflected from the optical disk. Accordingly, even if the optical disk in use has interrupted grooves, the optical head can be accurately moved to a desired track located on a land or on a groove.

REFERENCES:
patent: 4807210 (1989-02-01), Kaku et al.
patent: 4879707 (1989-11-01), Getreuer et al.
patent: 5001732 (1991-03-01), Nomura et al.

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