Device for switching a video tape recorder head to write/read mo

Details Device for switching a video tape recorder head to write/read mo Device for switching a video tape recorder head to write/read mo

1993-07-30

1996-01-09

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

General recording or reproducing

Signal switching

360 46, G11B 509, G11B 1512

Patent

active

054833906

ABSTRACT:
A device for switching a read head from a write mode to a read mode includes a voltage ramp generating circuit, generating and outputting a voltage ramp after a write operation; a variable current source for discharging an initial current of the read head, wherein a current output by the current source is controlled proportionally to the slope between the beginning of the voltage ramp and a first threshold of the ramp, the current source having an initial maximum value higher than the initial current of the head; and an accentuating circuit for accentuating the ramp slope between the beginning of the ramp and a time when the current output by the variable current source becomes equal to the initial current present in the head.

REFERENCES:
patent: 4868691 (1989-09-01), Kawasaki
patent: 4926271 (1990-05-01), Aoki et al.
patent: 5168395 (1992-12-01), Klassen et al.
Patent Abstracts of Japan, vol. 12, No. 002 (P652), Jan. 7, 1988, & JP-A-62164201 (Fuji Photo Film Co. Ltd.), Jul. 20, 1987.
Patent Abstracts of Japan, vol. 15, No. 420 (P-1267), Oct. 24, 1991, & JP-A-3171403 (Fujitsu Ltd.) Jul. 24, 1991.

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