Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1978-06-29
1980-05-13
Moses, R. L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
118661, 118DIG23, 430118, G03G 1510
Patent
active
042026202
ABSTRACT:
An apparatus for developing a latent electrostatic image by passing the image close to but out of contact with a surface of a liquid developer at a development zone. The values of the magnitude of the charge of the image, the distance between the image segment and the liquid surface at the development zone, and the physical characteristics of the liquid are such that at the development zone the electrostatic field created by the segment of the image at the zone, with or without the assistance of an external electrostatic field impressed upon the development zone, raises pseudopods from the liquid developer surface which extend toward the carrier on which the electrostatic image is present. The pseudopods and/or droplets separated from the tip of the pseudopods surface under the influence of the electrostatic field created by the image segment, but are opposed by gravity. Where there is no latent image, the voltages, the gap and the physical characteristics of the developing liquid are such that no developing liquid reaches the carrier, so that these uncharged segments of the carrier are not touched by the tips of the spikes or the droplets, and hence, remain dry and not colored by the color of the liquid if the liquid is colored. These dry spots constitute the background against which the developed latent image is seen. Such background, due to the balancing of the factors mentioned, remains in its virgin state and provides an excellent contrast for the colored developed image.
REFERENCES:
patent: 2558900 (1951-07-01), Hooper
patent: 3084043 (1963-04-01), Gundlach
patent: 3817748 (1974-06-01), Whittaker
Calabrese Peter J.
Finch Theron R.
Greenberg Arthur
Klavan Irving L.
McElroy Robert P.
Moses R. L.
Philip A. Hunt Chemical Corp.
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