Information recording/reproducing apparatus for writing on and r

Details Information recording/reproducing apparatus for writing on and r Information recording/reproducing apparatus for writing on and r

1991-09-03

1993-05-25

Psitos, Aristotelis

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 4428, G11B 700, G11B 2110

Patent

active

052146260

ABSTRACT:
An information recording/reproducing apparatus is suitable for writing on and reading from a rewritable optical disk signals having a time-based continuity attribute such as video signals and audio signals. The optical disk has a plurality of tracks each divided into sectors. The apparatus has a RAM for storing data externally supplied, and first and second address counters for generating addresses for writing into and reading from the RAM, respectively. The apparatus also has a track-jump detector circuit for detecting the occurrence of a track jump of an optical head while the head is writing on the disk. When a track jump is detected, a laser driving circuit stops actuating the head such that the writing operation is halted, and a track-jump address latch circuit stores an address of a track-jump occurring sector. Based on the address stored in the track-jump address latch circuit and a track address where the head is actually is, the head is returned to the sector where the track jump occurred. Then, under control of a CPU, the second address counter again generates addresses at which the RAM stores data which should have been written on the track-jump occurring sector from its leading position. Thus, even if a track jump occurs, information having a time-based continuity attribute is recorded without any data loss.

REFERENCES:
patent: 4736352 (1988-04-01), Satoh et al.
patent: 4860272 (1989-08-01), Nishikawa et al.
patent: 4926405 (1990-05-01), Hangai et al.

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