Method for forming an image on a magnetic composite medium and a

Details Method for forming an image on a magnetic composite medium and a Method for forming an image on a magnetic composite medium and a

1992-04-17

1994-06-28

Kight, III, John

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Magnetic imaging

430 31, G03G 1900

Patent

active

053246039

ABSTRACT:
In accordance with the invention, an image is formed by applying a local magnetic field to selected regions of a magnetic composite medium comprising columns of magnetic particles distributed in a matrix medium. The particles are "hard" or "semi-hard" magnetic materials in order to retain the latent image as residual magnetism, and the image is developed by exposure to magnetic fluid or powders. The image can be erased by exposure to an AC demagnetizing field or a DC sweep magnet. Preferred apparatus for making such images comprises a sheet of such composite material having a pair of major surfaces with columns of magnetic particles oriented between the surfaces. A local magnetic field, such as a magnetic pen, can be used to write a latent magnetic image on one of the major surfaces. The magnetic columns present the latent image for development at either major surface. In preferred apparatus, one major surface is adapted for magnetic image writing and the other major surface is positioned in sealed relationship with a chamber for exposing the image to magnetic development material. In this arrangement the columns provide a high resolution image on the second surface despite the thickness of the medium between the write and development surfaces.

REFERENCES:
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patent: 4644101 (1987-02-01), Jin et al.
patent: 4737112 (1988-04-01), Jin
patent: 5045249 (1991-09-01), Jin
Xerox Disclosure Journal, "Magneto-Fluid Display", vol. 1 No. 9/10, (1976), p. 53.
S. Jin, et al. "Optically Transparent, Electrically Conductive Composite Medium", Science, vol. 255, pp. 446-448, (1992).
B. D. Cullity, Introduction To Magnetic Materials, Addison-Wesley, Menlo Park A, p. 491 (1972).
R. J. Parker, Advances in Permanent Magnetism, John Wiley & Sons, New York.
T. Lyman, Ed., Metals Handbook, 8th Ed., vol. 1 -Properties and Selection of Metals, American Soc. for Metals, OH, 1961, p. 779.
Jin, S. et al., "New, Z-direction anisotropically conductive composites," J. Appl. Phys., vol. 64, No. 10, Nov. 15, 1988, pp. 6008-6010.

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