Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2005-11-01
2005-11-01
Nguyen, Hoa T. (Department: 2652)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S047510
Reexamination Certificate
active
06961294
ABSTRACT:
An information recording apparatus controls a recording power to be optimal without using a high-rate sampling circuit even when a recording condition changes. A laser diode emits a light at a first optical amount value and a second optical amount value greater than the first value. The light emitted by the laser diode is irradiated onto an optical disc. A signal level value of the reflected light is detected by a sample hold circuit or a low-pass filter, and one of the outputs of the low-pass filter and the signal hold circuit is selected in accordance with an instruction for selection. The sample hold circuit detects the signal level value of a sampled reflected light. The low-pass filter outputs an average value of the signal level value. A drive current driving the laser diode is adjusted by comparing the signal level values before recording information and after starting information recording.
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Battaglia Michael V.
Dickstein , Shapiro, Morin & Oshinsky, LLP
Nguyen Hoa T.
Ricoh & Company, Ltd.
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