Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1989-09-26
1991-08-20
Richardson, Robert L.
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
369 48, 369 58, 369116, 346 76L, G11B 700
Patent
active
050420232
ABSTRACT:
An apparatus for optically recording data on a recording medium having data recording tracks consisting of a number of blocks each including a header area in which a block number is recorded and a data area in which data is to be recorded. Consecutive block numbers are recorded on consecutive blocks. The apparatus reads out the block number from the header area, discriminates whether or not the block number read consecutively changes during a recording mode, and stops recording when a nonconsecutive change in block number is detected. Data recording and reproducing operations are performed with a laser the operation of which is controlled by a laser control circuit. A malfunction detecting circuit monitors varies laser operating parameters as well as the commanded laser operating mode and causes the laser to be turned off upon detecting a malfunction of the laser.
REFERENCES:
patent: 4570251 (1986-02-01), Yokota et al.
patent: 4849956 (1989-07-01), Aizawa
patent: 4937804 (1990-06-01), Ishihara
patent: 4956832 (1990-09-01), Miyasaka
Kabushiki Kaisha Toshiba
Richardson Robert L.
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