Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Reexamination Certificate
2005-09-27
2005-09-27
Miller, Brian E. (Department: 2652)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
C369S053270
Reexamination Certificate
active
06950378
ABSTRACT:
A laser power control method according to the present invention is a method for controlling an output power of a laser3which is used for recording information on a recording medium1. The method comprises steps of: detecting emitted light of the laser by a first detection section4; obtaining a first driving current of the laser by a first control section8based on an output of the first detection section; detecting reflected light or transmitted light from the recording medium by a second detection section5; and obtaining a second driving current of the laser by a second control section12based on an output of the second detection section. The laser is driven based on the first driving current or the second driving current while the first control section and the second control section are operated alternately such that the second control section does not operate when the first control section is operating, and the first control section does not operate when the second control section is operating. With such a structure, even when a plurality of laser powers which are switched at a high speed are required for recording of information, each laser power can be controlled so as to be an appropriate power for recording of information.
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Akagi Toshiya
Inokuchi Chikashi
Miyazaki Atsushi
Yamaguchi Hiroyuki
Battaglia Michael V.
Miller Brian E.
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