Magnetic head switching matrix with bi-directional current capab

Details Magnetic head switching matrix with bi-directional current capab Magnetic head switching matrix with bi-directional current capab

1976-04-19

1977-12-13

Lucas, Jay P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Signal switching

360 63, G11B 1512

Patent

active

040632938

ABSTRACT:
A magnetic head switching matrix selectively couples a plurality of balanced read-write heads to the output of a write amplifier and to the input of a read amplifier. Constant current supplies apply equal constant currents to a pair of write data lines connected to the write amplifier output and two further constant current supplies apply equal constant currents to two read data lines connected to the read amplifier input. The two coils of each head are coupled to the write data lines through two matched diodes respectively and are similarly coupled to the read data lines through another pair of matched diodes respectively. The center tap of each head is coupled to write and read reference voltage sources through respective diodes as well as being coupled to a read-write control voltage source. A head write selection current supply applies a selection current to the center tap of a selected head for writing purposes and a head read selection current supply applies a current to the center tap of a selected head for reading purposes.

REFERENCES:
patent: 3248717 (1966-04-01), Mayhew
patent: 3453612 (1969-07-01), Poumakis
patent: 3810135 (1974-05-01), Kawakami
patent: 3930266 (1975-12-01), Okamoto

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