Recording with imagewise alteration of magnetic attraction of do

Details Recording with imagewise alteration of magnetic attraction of do Recording with imagewise alteration of magnetic attraction of do

1977-06-08

1979-02-06

Lucas, Jay P.

Recorders

Magnetographic

360 59, G01D 1900

Patent

active

041386850

ABSTRACT:
A method for marking a recording surface includes providing a premagnetized magnetic donor layer having magnetically held on its surface magnetically attractable marking particles. The magnetic attraction between the marking particles and the donor layer is changed in selected areas of the donor layer so that the particles held in the selected areas are attracted to the recording surface by a magnetic field.

REFERENCES:
patent: 3257222 (1966-06-01), Carlson
patent: 3693183 (1972-09-01), Lemke
patent: 3781905 (1973-12-01), Bernal
patent: 3824601 (1974-07-01), Garland
patent: 4030105 (1977-06-01), Neukermans
patent: 4032923 (1977-06-01), Pond
patent: 4038665 (1977-07-01), Neukermans
patent: 4074276 (1978-02-01), Haas et al.
Journal of Applied Physics, pp. 1763-1768, vol. 42, No. 4, Mar. 1971, CrO hd 2 Based Thermomagnetic Information Storage and Retrieval Systems -- R. K. Waring, Jr.

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