Apparatus for forming an erasable record of the value of a measu

Details Apparatus for forming an erasable record of the value of a measu Apparatus for forming an erasable record of the value of a measu

1976-04-14

1977-10-18

Lucas, Jay P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data verification

G11B 502

Patent

active

040549224

ABSTRACT:
The record carrier is made of a material which can be caused to assume a dark state by passing a magnetic field through the record carrier normal thereto. It can be caused to assume a light state by establishing in the general plane of the record carrier two magnetic fields which are oriented generally perpendicular to each other. The recording apparatus which incorporates the record carrier is provided with means for effecting record carrier transport past an erasing unit and a writing unit. The writing unit forms a recording trace on the record carrier during such transport by generating a radial field lying in the general plane of the record carrier. Because this field is radial it is comprised of field components which are oriented generally perpendicular to each other and which furthermore are oriented at angles to the record carrier transport direction. The erasing unit erases the recording trace formed by the writing unit by establishing a magnetic field which extends transverse to the record carrier transport direction and which is comprised of field lines passing through the record carrier normal thereto.

REFERENCES:
patent: 2511121 (1950-06-01), Murphy
patent: 3683382 (1972-08-01), Ballinger
patent: 3810191 (1974-05-01), Stauffer
patent: 3879754 (1975-04-01), Ballinger
patent: 3947879 (1976-03-01), Stauffer

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