Optical head for recording and playing back optical information

Details Optical head for recording and playing back optical information Optical head for recording and playing back optical information

1990-10-24

1992-01-28

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4437, 369 4441, 369112, 369 4424, 2502015, G11B 700

Patent

active

050848518

ABSTRACT:
The present invention relates to an optical head for recording and playing back optical information, the optical head comprising an illumination system which shines three beams of light comprising 0-dimensional diffraction light, +1-dimensional diffraction light, and -1-dimensional diffraction light onto an optical information recording medium, and a photoreceiver system which receives three beams of reflected light from the recording medium; the photoreceiver system being provided with an edge mirror whereby, of the three beams of reflected light from the recording medium, approximately one half of the 0-dimensional diffraction light and all of the +1-dimensional diffraction light is received by a first photoreceiver diode, without being affected by the edge mirror, and the remaining approximately one half of the 0-dimensional diffraction light and all of the -1-dimensional diffraction light is reflected by the edge mirror and is received by a second photoreceiver diode; wherein a focusing control signal, a tracking control signal, and an information signal are obtained from an output from the first photoreceiver diode or the second photoreceiver diode, or from combined outputs from the first photoreceiver diode and the second photoreceiver diode.

REFERENCES:
patent: 4450547 (1984-05-01), Nakamura et al.
patent: 4504938 (1985-03-01), Tajima
patent: 4724533 (1988-02-01), Ohara et al.
patent: 4823334 (1989-04-01), Tanaka et al.
patent: 4873678 (1989-10-01), Nakamura et al.

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