Optical head for erasing

Details Optical head for erasing Optical head for erasing

1984-09-27

1987-05-12

Faber, Alan

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 46, 369112, 369100, G11B 7095

Patent

active

046655123

ABSTRACT:
In an optical system for recording, reproducing and erasing information by converging a laser beam on an erasable recording layer on an optical disk, a laser beam having the same spot size as an aperture of an objective lens is converged by the objective lens and is projected on the recording layer in the recording/reproducing mode. In the erasing mode, a cylindrical lens is inserted in the optical path of the laser beam directed toward the objective lens to be perpendicular to a direction along which a tracking guide on the recording layer extends. Therefore, a beam spot extending along the tracking guide extension direction is formed on the recording layer, thereby erasing information.

REFERENCES:
patent: 3368209 (1968-02-01), Glauchlan
patent: 3736046 (1973-05-01), Zook
patent: 3983317 (1976-09-01), Glorioso
patent: 4079248 (1978-03-01), Lehureau et al.
patent: 4115809 (1978-09-01), Ueno
patent: 4123652 (1978-10-01), Bouwhuis
patent: 4125859 (1978-11-01), Oshida
patent: 4163149 (1979-07-01), Sawano et al.
patent: 4467462 (1984-08-01), Shibata
patent: 4564931 (1986-01-01), Ohara
patent: 4566088 (1986-01-01), Yoshida

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