Recorders – Magnetographic
Patent
1975-07-10
1977-05-24
Lucas, Jay P.
Recorders
Magnetographic
360122, 360123, G03G 1900, G11B 522, G11B 520
Patent
active
040259277
ABSTRACT:
A head for producing magnetic images of fine detail, including a group of recording elements spaced perpendicular to the movement of a magnetic tape and a power source that passes current pulses through the recording elements to create magnetic fields that magnetize small regions of the tape. Each recording element includes an elongated conductor with a thin nickel layer nearest the magnetic tape and a thick copper layer on the side of the nickel layer opposite the tape, the copper layer having a small gap therein at a predetermined recording location. Accordingly, the center of current flow is normally through a middle portion of the copper which is too far from the magnetic tape for the resulting magnetic field to magnetize the tape, except at the recording location where the current passes through the nickel layer which is close enough to the tape to magnetize it.
REFERENCES:
patent: 3254626 (1966-06-01), Uemura
patent: 3611417 (1971-10-01), Sauter
patent: 3648264 (1972-03-01), Gruczelak
patent: 3662361 (1972-05-01), Mee
patent: 3685144 (1972-08-01), Trimble
patent: 3781476 (1973-12-01), Hanazono
patent: 3881192 (1975-04-01), Ballinger
IBM Tech. Discl. Bull., vol. 15, No. 2, July 1972, p. 5161, "Horizontal Thin-Film", Watrous.
Cubic Photo Products Division
Lucas Jay P.
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