Optical information recording and reproducing apparatus

An optical information recording and reproducing apparatus for an optical information record medium (101) on which a plurality of tracks are arranged substantially in parallel, comprises a light source (107), a first optical system (108,119,109) for forming a small spot on the record medium by conve...

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Bibliographic Details
Main Authors SHIKICHI, SATOSHI, KITAI, HIROTO, HOSOYA, HIDEKI
Format Patent
LanguageEnglish
French
German
Published 25.11.1987
Edition4
Subjects
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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Summary:An optical information recording and reproducing apparatus for an optical information record medium (101) on which a plurality of tracks are arranged substantially in parallel, comprises a light source (107), a first optical system (108,119,109) for forming a small spot on the record medium by converging a light beam from the light source, a second optical system (109,113) for obtaining the light beam from the record medium, a detecting device (115,10,11,12) for receiving the light beam obtained by the second optical system to output a tracking signal, a vibrating device (15,111) for vibrating the spot relatively to the record medium in a direction intersecting the extension of the track, a control device (13,111) for effecting a tracking control with respect to the track, and a selecting device (17,16,14) for selectively actuating the vibrating device and the control device in accordance with the tracking signal from said detecting device.
Bibliography:Application Number: EP19870304528