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1. IN309/CHENP/2006 - RECORD CARRIER ,DEVICE AND METHOD FOR CORRECTING SIGNED DEVIATION

Office
India
Application Number 309/CHENP/2006
Application Date 25.01.2006
Publication Number 309/CHENP/2006
Publication Date 06.07.2007
Grant Number 228839
Grant Date 20.03.2009
Publication Kind B
IPC
G11B 7/125
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
125Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
Applicants
Title
(EN) RECORD CARRIER ,DEVICE AND METHOD FOR CORRECTING SIGNED DEVIATION
Abstract
(EN) A device for recording information in a track on a record carrier writes and reads marks and spaces each having a nominal run length. The device has a detection unit (32) for generating a signed deviation value signal (34) indicative for a position deviation of a starting edge of a mark and/or an ending edge of a mark with respect to a nominal position of said edge. A calculation unit (31) selects at least one predefined run length pattern and determines a correction signal (33) based on at least one statistically calculated parameter of the signed deviation value signal for the selected run length pattern. A radiation source control unit (29) controls the power of the radiation source during said writing based on the correction signal.