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Developing Electrophotographic Images

IP.com Disclosure Number: IPCOM000095072D
Original Publication Date: 1965-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Crawford, TM: AUTHOR

Abstract

With liquid development of latent electrostatic images, the highest resolution is obtained with relatively short exposures. However, background is higher under these conditions.

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Developing Electrophotographic Images

With liquid development of latent electrostatic images, the highest resolution is obtained with relatively short exposures. However, background is higher under these conditions.

The background produced by developing an electrostatic image with a liquid toner can be greatly reduced by exposing the image to light after development, but while the surface is still wet. Under proper conditions, neither the image density nor the resolution is adversely affected, while the background is significantly reduced. For example, the background of an electrostatic image produced on a transparent organic photoconductor with liquid toner is reduced from 0.4 to 0. 0 optical density. The resolution of 181 lines/mm is not affected by the post exposure, nor is the image density lessened. This clearing is accomplished in less than one minute with the light from a 15 watt fluorescent tube filtered to remove all infrared and heat radiation.

Clearing can be achieved by illuminating from the front surface or through the rear, for a transparent photoconductor. Such clearing is effected with sources high in infrared and with sources from which infrared is removed.

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