Apparatus for detecting whether information is recorded on a sto

Details Apparatus for detecting whether information is recorded on a sto Apparatus for detecting whether information is recorded on a sto

1988-07-22

1990-08-28

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 54, G11B 700

Patent

active

049531514

ABSTRACT:
In an apparatus for detecting whether or not an information signal is recorded on a storage disk, a light beam is allowed to scan an information track of the disk. The light beam is wobbled in a direction perpendicular to a longitudinal direction of the track in response to a wobbling signal. A reproduced signal is derived from the light beam which was affected by the disk. A variation in amplitude of the reproduced signal is derived. A difference between the derived amplitude variation and the vibration signal is detected. A detection signal is generated which represents the detected difference.

REFERENCES:
patent: 3985952 (1976-10-01), Adler
patent: 4118735 (1978-10-01), Wilkinson
patent: 4397010 (1983-08-01), Nabeshima
patent: 4471477 (1984-09-01), Bierhoff
patent: 4488276 (1984-12-01), Tanaka et al.
patent: 4535431 (1985-08-01), Bricot et al.

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