Image printing apparatus and image printing method

Details Image printing apparatus and image printing method Image printing apparatus and image printing method

1995-05-23

1997-08-26

Eickholt, Eugene H.

Typewriting machines

Typing by other than type-face or type-die

Thermal

40012009, 101489, 346 761, 347183, 347205, B41J 236

Patent

active

056604866

ABSTRACT:
An image printing device includes a latent image charge keeping medium including a pyroelectric layer, a thermal head for selectively heating the charge keeping medium according to a signal, and an electrically conductive film disposed to be brought into contact with or to be in the vicinity of a surface of the pyroelectric layer of the medium for being heated by the thermal head, thereby neutralizing charge appearing on the medium due to pyroelectric effect. The device further includes a developer for visualizing with a charged coloring medium an electrostatic latent image formed on the medium, a transfer roller for transferring the developed image onto a sheet of printing paper, and a fixing device for fixing the transferred image on the printing sheet. The conductive layer is applied with a bias voltage from a power source such that a strong absorbing force acts upon charge, thereby efficiently neutralizing the charge. There are attained a high printing density and a favorable uniformity in the printing density.

REFERENCES:
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patent: 3935327 (1976-01-01), Taylor
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patent: 5153615 (1992-10-01), Swelling
patent: 5185619 (1993-02-01), Snelling
patent: 5353105 (1994-10-01), Gundlach et al.
patent: 5533816 (1996-07-01), Ikeda et al.
J.G. Bergman, et al, "Pyroelectric Copying Process", Appl. Phys. Lett., vol. 21, No. 10, 1972, pp. 497-499.

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