Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2006-11-07
2006-11-07
Psitos, A M (Department: 2627)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S124110, C250S2140AG
Reexamination Certificate
active
07133346
ABSTRACT:
A two-stage amplifier of a first-stage amplifier21and second-stage amplifiers22and23is provided. A writing mode and reproducing modes are switched in the first-stage amplifier21by switching a parallel circuit of a feedback capacitor Cf1w and a feedback resistor Rf1w and a parallel circuit of a feedback capacitor Cf1r and a feedback resistor Rf1r. The second-stage amplifier23is provided with feedback resistors Rf22and Rf23that are connected to each other in parallel. The feedback resistor Rf23is connected in the feedback loop by a switch transistor QSW only when reproducing a high-reflective disk. This enables an amplifier gain to be suitably set for each of writing, low-reflective disk reproducing, and high-reflective disk reproducing. As a result, desirable reproducing characteristics can be obtained for the low-reflective disk while accommodating high-speed writing with a large laser power.
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Chinese Office Action and partial English translation thereof mailed Jun, 25, 2004 in corresponding Chinese application No. 02156306.3.
Okuda Takanori
Yokoyama Takashi
Nixon & Vanderhye P.C.
Psitos A M
Sharp Kabushiki Kaisha
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