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Electrophotographic Halftone System

IP.com Disclosure Number: IPCOM000085175D
Original Publication Date: 1976-Mar-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Gamblin, RL: AUTHOR

Abstract

Utilizing an electrophotographic imaging element of the type shown halftone images having a good grey scale are produced. The imaging element is of the multilayered type, including a conductive substrate 2, a barrier layer 4 coated on the substrate 2, a charge generation layer 6 on the barrier layer 4 and a charge transport layer 8 coated on the charge generation layer 6.

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Electrophotographic Halftone System

Utilizing an electrophotographic imaging element of the type shown halftone images having a good grey scale are produced. The imaging element is of the multilayered type, including a conductive substrate 2, a barrier layer 4 coated on the substrate 2, a charge generation layer 6 on the barrier layer 4 and a charge transport layer 8 coated on the charge generation layer 6.

The charge generation layer 6 consists of a pattern of charge generation material 10 and another material 12 which has a high dark decay rate. For example, the charge generation material may be a monoazo or disazo dye, a derivative of squaric acid, a selenium-tellurium alloy or any other conventional charge generation material. The dark decay material 12 may be, for example, pure tellurium derivatives of squaric acid, or any other material which is capable of field induced injection into the charge transport layer 8.

In opertion this photoconductor is exposed to a charge corona system, much as in a conventional electrophotographic system. In those regions of the element overlying the high dark decay material 12, the charge is immediately dissipated. This operation thus leaves a pattern of charge concentrated over charge generation material 10, with no charge in adjacent regions overlying dark decay material 12. Now, when this material is exposed to light in a conventional manner, those areas at which light strikes the charge generation material 10 are discharg...