发明名称 |
Method of and apparatus for correcting edge interval of pit in optical recording/read-out apparatus |
摘要 |
A pit edge interval correcting method in an optical recording/read-out apparatus wherein as data items to be used to correct pit edge intervals for cancellation of a thermal interference from a previously recorded pattern, there is formed a table representing relationships between kinds of record patterns and edge shift quantities of the patterns in a read-out signal. Edge shift quantities of particular patterns with respect to a unitary variation quantity of a recording medium surface temperature (an ambient temperature of an optical disk) and edge shift quantities of particular patterns with respect to a unitary variation quantity of laser power are beforehand acquired as correction control data. Before actual data are recorded, the particular patterns are again recorded on a medium and read out therefrom. If an edge shift occurs in a read-out signal, a variation quantity of the recording medium surface temperature and a variation quantity of the laser power are separately obtained based on a quantity of the edge shift occurring and the correction control data collected in advance. Using each variation quantity, the value set to the laser power is altered and/or the data in the table are updated to correct the actual data.
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申请公布号 |
US5418770(A) |
申请公布日期 |
1995.05.23 |
申请号 |
US19910764922 |
申请日期 |
1991.09.24 |
申请人 |
HITACHI, LTD. |
发明人 |
IDE, HIROSHI;MAEDA, TAKESHI;SAITO, ATSUSHI |
分类号 |
G11B7/0045;G11B7/013;G11B7/125;G11B11/105;G11B20/10;G11B20/12;G11B20/18;G11B27/36;(IPC1-7):G11B7/00 |
主分类号 |
G11B7/0045 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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