发明名称 |
Optical recording and reproducing apparatus for controlling a laser driver current according to test data on the disc |
摘要 |
In an optical information recording method and apparatus for performing the pre-write testing of test data for an optical recording medium connected to a host computer, an instruction for pre-write testing of test data inclusive of two predetermined continuous signals is received independently from a write command from the host computer. The pre-write testing of the test data is performed by supplying different laser driving currents for plural ones of pre-write testing areas of the optical recording medium to an optical information recording head in accordance with the pre-write testing instruction. The respective pre-write testing data are reproduced to determine a difference in an average voltage level between the two continuous signals of each test data. The laser driving current supplied for the pre-write testing of the test data indicative of the smallest value of the difference is set as a laser driving current which is to be supplied to the optical information recording head when the recording of user data is to be performed. A time interval until the next pre-write testing of test data is set in accordance with the set laser driving current. With the above construction, the pre-write testing can be eliminated at every write command requested from the host computer.
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申请公布号 |
US5513166(A) |
申请公布日期 |
1996.04.30 |
申请号 |
US19940229317 |
申请日期 |
1994.04.18 |
申请人 |
HITACHI, LTD. |
发明人 |
TOKUMITSU, KENJI;HARIGAI, FUMIHIRO |
分类号 |
G11B7/00;G11B7/0045;G11B7/125;G11B11/105;G11B20/18;(IPC1-7):G11B7/00 |
主分类号 |
G11B7/00 |
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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