Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2007-12-19
2011-12-20
Feild, Joseph (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
Reexamination Certificate
active
08081559
ABSTRACT:
The present invention provides a recording and reproducing apparatus that can perform high-precision tracking servo control by removing noise from detected servo signals. The recording and reproducing apparatus performs tracking servo control while reading servo signals10that are formed on a surface9of a recording medium2so as to produce optical contrast, the apparatus including a modulated irradiator20for irradiating the servo signals10with a light beam, the intensity of the light beam being modulated by a modulating wave that is frequency-modulated; a photoelectric converter30for converting reflected light from the servo signals10into electric signals; and a synchronous demodulator15for subjecting the electrical signal to synchronous demodulation using the modulating wave as a reference wave.
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Fujita Masao
Kawakami Shinji
Kuse Sadamu
Tanaka Kenji
Birch & Stewart Kolasch & Birch, LLP
Feild Joseph
Gupta Parul
Hitachi Maxell Ltd.
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