OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE

PURPOSE:To diminish useless movement of an objective lens and to prevent detracking by changing a limit current to be inputted to a moving means by a tracking control means in accordance with its frequency. CONSTITUTION:A signal to be inputted to the moving means 111 is limited to a limit value by t...

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Bibliographic Details
Main Author SHIKICHI SATOSHI
Format Patent
LanguageEnglish
Published 23.04.1991
Subjects
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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Summary:PURPOSE:To diminish useless movement of an objective lens and to prevent detracking by changing a limit current to be inputted to a moving means by a tracking control means in accordance with its frequency. CONSTITUTION:A signal to be inputted to the moving means 111 is limited to a limit value by the tracking control means 217, and also the limit value is changed by the frequency. That is, when noise is generated in a signal 203 due to dust or a flaw on a medium, a current to flow in a tracking coil 111 is limited to a low value because the frequency of this noise is relatively high. By this method, useless movement of the objective lens is diminished, and detracking is prevented.
Bibliography:Application Number: JP19890236314