Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of biasing or erasing
Patent
1996-03-21
1997-10-21
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of biasing or erasing
360 46, G11B 503, G11B 509
Patent
active
056802684
ABSTRACT:
A magnetic head drive circuit connected to a magnetic recording/playback head is supplied with an unbalanced write current. The drive circuit includes a recording/playback coil divided by a center tap into a first coil and a second coil. A high level of a value lower than the high level of a control signal of an input terminal IN3 is impressed to one of a control signal of input terminals IN1 and IN2 and a low level is impressed to the other so that a direction is determined of a write current supplied to the recording/playback coil from a current source composed of a current mirror made up from NPN bipolar transistors and resistors. The balanced/unbalanced switching of the supplied write current is performed by switching the voltage level impressed to control signal input terminal IN3 using an NPN bipolar transistor as a switching unit.
REFERENCES:
patent: 4110804 (1978-08-01), Castrodale et al.
patent: 4787002 (1988-11-01), Isozaki
patent: 4845573 (1989-07-01), Hardeng
patent: 5280196 (1994-01-01), Shinozaki
patent: 5282094 (1994-01-01), Ngo
Neal Regina Y.
NEC Corporation
Psitos Aristotelis M.
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