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Photoconductor

IP.com Disclosure Number: IPCOM000076380D
Original Publication Date: 1972-Feb-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Chadwell, RJ: AUTHOR [+2]

Abstract

A photoconductor consisting of a charge transport layer, which includes a photoconductive material coated over a dichroic sensitizer layer, is exposed to light of a first frequency which obtains the peak photo-response for charge injection from the transport layer, for creation of a latent electrostatic image on the photoconductor. After development and transfer of the image, the photoconductor is erased by exposing it to light of a second frequency approximating the peak photo-response frequency of the photoconductive material, to remove residual voltage from the charge transport layer prior to reimaging.

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Photoconductor

A photoconductor consisting of a charge transport layer, which includes a photoconductive material coated over a dichroic sensitizer layer, is exposed to light of a first frequency which obtains the peak photo-response for charge injection from the transport layer, for creation of a latent electrostatic image on the photoconductor. After development and transfer of the image, the photoconductor is erased by exposing it to light of a second frequency approximating the peak photo-response frequency of the photoconductive material, to remove residual voltage from the charge transport layer prior to reimaging.

The charge transport layer consists of a film of 75% polyester resin (P E-200 manufactured by E. I. Du Pont) and of 25% photoconductive material (oxadiazole) which, when coated over a dichroic sensitizer (2,6-bis[2- pidimethylaminophenyl]-aza-ethylene-1-benz- (1,2-d:4,5-d') bisithiazole), has a peak photoresponse for charge injection of 5500 A degrees. Following development and transfer of the exposed image, the photoconductor is exposed to light of 4350 A degrees corresponding to the peak photoresponse of the oxadiazole. Light of this wavelength is filtered during imaging, enabling the charge transport layer to transport a charge as a semiconductor when imaging, and for initiating a charge as a photoconductor when erasing.

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