Floppy disc device with a delay mechanism

Details Floppy disc device with a delay mechanism Floppy disc device with a delay mechanism

1981-09-17

1984-08-14

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Signal switching

360 57, G11B 1512, G11B 502

Patent

active

044660251

ABSTRACT:
A floppy disc device having a read/write head, a pair of erase heads and a delay mechanism for delaying the operation of the erase heads with respect to the operation of the read/write head is provided. The pair of erase heads is provided in the downstream direction of the read/write head with respect to the movement of a floppy disc recording medium, thereby avoiding cross coupling between the read/write and erase heads. In accordance with one aspect of the present invention, the delay mechanism delays energization and deenergization of the erase heads with respect to those of the read/write head. Another aspect of the present invention is that the delay mechanism delays energization of the erase heads with respect to energization of the read/write head for some of a plurality of concentic recording tracks. The present invention made it possible to carry out proper tunnel-erasing without under-erasing and/or over-erasing.

REFERENCES:
patent: 3852812 (1974-12-01), Reisfeld
patent: 3860958 (1975-01-01), Hanson
patent: 4164781 (1979-08-01), Brown
patent: 4300174 (1981-11-01), Harman et al.

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