Apparatus for optically recording and reproducing information

Details Apparatus for optically recording and reproducing information Apparatus for optically recording and reproducing information

1991-08-08

1992-10-06

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4437, 369 4441, 369 4426, 369109, G11B 700

Patent

active

051538636

ABSTRACT:
An apparatus for optically recording and reproducing information in and from an optical information recording medium having a guide track. The apparatus uses an optical head having a diffraction grating, for recording and reproducing information. In recording information, a zero-order diffraction light beam from the diffraction grating is used for the information recording, and plus/minus first-order diffraction light beams from the diffraction grating are used for the tracking. In reproducing information, the zero-order diffraction light beam is used for the tracking, and higher- and odd-order diffraction light beams including at least plus/minus first-order diffraction light beams are used for information reproduction.

REFERENCES:
patent: 4598393 (1986-07-01), Pierce et al.
patent: 4658389 (1987-04-01), Kuehn
patent: 4660191 (1987-04-01), Maeda et al.
patent: 4686663 (1987-08-01), Kuhn
patent: 4695992 (1987-09-01), Aoi
patent: 4831609 (1989-05-01), Suzuki
patent: 4881214 (1989-11-01), Izawa et al.

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