Browse Prior Art Database

Post Developer Backlight

IP.com Disclosure Number: IPCOM000075761D
Original Publication Date: 1971-Nov-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Cecil, TF: AUTHOR [+3]

Abstract

In order to increase transfer efficiency in a dry, electrostatic copier it is desirable to decrease the electrostatic image on the photoconductor after development and at, or before, transfer. Ordinarily, the electrostatic field holding the toner to the photoconductor at the transfer point competes with the transfer field for the toner.

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Post Developer Backlight

In order to increase transfer efficiency in a dry, electrostatic copier it is desirable to decrease the electrostatic image on the photoconductor after development and at, or before, transfer. Ordinarily, the electrostatic field holding the toner to the photoconductor at the transfer point competes with the transfer field for the toner.

One method used is to illuminate the photoconductor from the same side as that on which the toner resides. This has proven impractical because the toner covers the charged areas of the photoconductor, and toner absorbs considerable light.

The present system makes use of a translucent ground plane and substrate under the photoconductor, Fig. 1, and a source of illumination mounted behind the photoconductor after the development step and before or at the transfer step, Fig. 2. The system has been found to give a significant increase in transfer efficiency and a decrease in cleaning load.

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