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Electrostatic Images by Differential Charge Decay Under Radiation

IP.com Disclosure Number: IPCOM000094213D
Original Publication Date: 1966-Jul-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Shattuck, M: AUTHOR [+3]

Abstract

The speed of a photoconductor, when used in the expose-charge sequence of electrophotography, can be increased. This is effected by exposing the photoconductor to an optical image for a time insufficient to form an electrostatically developable image. This is followed by electrostatically charging the photoconductor and a uniform exposure of the photoconductor. The total exposure time of the two exposures is substantially shorter than a conventional single exposure to the optical image. It is still sufficient to provide a developable image. This is shown in the following examples.

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Electrostatic Images by Differential Charge Decay Under Radiation

The speed of a photoconductor, when used in the expose-charge sequence of electrophotography, can be increased. This is effected by exposing the photoconductor to an optical image for a time insufficient to form an electrostatically developable image. This is followed by electrostatically charging the photoconductor and a uniform exposure of the photoconductor. The total exposure time of the two exposures is substantially shorter than a conventional single exposure to the optical image. It is still sufficient to provide a developable image. This is shown in the following examples.

A coating of a photoconductive composition, capable of exhibiting persistent photoconductivity on an aluminum substrate is exposed through a positive image to a 100 watt mercury arc, modified with Corning 3-75 filter at 2.25 inches for
0.05 second. The coating then is electrostatically charged with a corona unit and given a uniform exposure to the mercury arc at 25 inches for 0.01 second. A visible image is obtained by toning the electrostatic image on the coated substrate. Without the uniform exposure, a visible image is obtained only after an exposure of 0.2 second to the same source. Thus, the total exposure time for the two exposures is. 06 second versus 0. 2 second for single exposure.

A coating of another photoconductive composition, capable of exhibiting persistent photoconductivity, on an aluminum substrate is exp...