Optical information recording and reproducing apparatus

The 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 (108-110) for guiding a light beam from the light source, onto the record medium, a second optical system (110,10...

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Bibliographic Details
Main Authors SHIKICHI, SATOSHI, 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:The 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 (108-110) for guiding a light beam from the light source, onto the record medium, a second optical system (110,109,109,113,114) for obtaining the light beam from the record medium, a detecting device (115,116) for receiving the light beam obtained by the second optical system to output at least one of a focusing signal and a tracking signal, and adjusting device (121,122,111, 112) for adjusting at least one of focusing and tracking operation in accordance with at least one of the focusing and tracking signals, a reciprocating device (125) for causing the record medium to reciprocate, a control device (123,125) for controlling the reciprocating device, and a change device (126,121-2,C,D,122-2,A,B) for changing at least a servo gain of the adjusting device in accordance with at least a signal from the control device.
Bibliography:Application Number: EP19870304349