Optical recording/reproducing apparatus with transmission...

Details Optical recording/reproducing apparatus with transmission... Optical recording/reproducing apparatus with transmission...

2005-07-22

2009-02-17

Huber, Paul (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S053250

Reexamination Certificate

active

07492693

ABSTRACT:
When a light-receiving element receives a first laser beam, an output power detection unit detects a differential quantum efficiency value of the first laser beam. A control unit judges whether or not an intensity filter and a filter driving unit are operated in accordance with a control signal output from the control unit by using the differential quantum efficiency value from the output power detection unit.

REFERENCES:
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patent: 2004/0022152 (2004-02-01), Hayashi
patent: 2006/0198276 (2006-09-01), Nishi et al.
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patent: 2000-195086 (2000-07-01), None
patent: 2003-115109 (2003-04-01), None
patent: 03/049096 (2003-06-01), None

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