Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Reexamination Certificate
2006-05-16
2006-05-16
Edun, Muhammad (Department: 2656)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
C369S047500, C369S053100, C369S047370, C369S053450
Reexamination Certificate
active
07046600
ABSTRACT:
A method is designed for controlling a power of a laser beam irradiated onto a track of an optical disc for recording of data at a given linear velocity. The method is carried out by the steps of performing test recording into a predetermined area of the optical disc before actual recording of data, acquiring a reproduction signal representative of a result of the test recording from the predetermined area of the optical disc, acquiring velocity-parameter characteristic information indicative of the relationship between plural levels of the linear velocity and target values of a parameter representative of a quality of the recording, deriving velocity-power characteristic information indicative of the relationship between the levels of the linear velocity and optimal values of the power based on both of the reproduction signal representative of the result of the test recording and the velocity-parameter characteristic information, and controlling the power of the laser beam irradiated onto the optical disc in accordance with the velocity-power characteristic information at the time of the actual recording.
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Device and Method for Recording Optical Disk (JP, 5-225,570), Koike Shigeaki, abstract only.
State Intellectual Property Office of People's Republic of China, The First Office Action, Application No. 02127347.2, Issuing Date: Mar. 11, 2005, Applicant: Yamaha Corporation.
Edun Muhammad
Pillsbury Winthrop Sha Pittman LLP
Yamaha Corporation
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