Browse Prior Art Database

Electrophotographic Imaging Element

IP.com Disclosure Number: IPCOM000087679D
Original Publication Date: 1977-Mar-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Anderson, HW: AUTHOR [+3]

Abstract

Multilayered electrophotographic imaging elements having a separate conductive substrate, charge generation layer, and charge transport layer are described, for example, in U. S. Patent 3,837,851. In operation, light passing through the the transport layer causes the generation of holes and electrons in the charge generation layer. Then, depending upon the nature of the charge transport layer and the charge at the surface of the element, holes or electrons travel through the transport layer to dissipate a portion of the charge at the surface of the element. Most ingredients utilized as transport layers preferentially transport primarily only holes or only electrons. However, it has now been determined, that electrons will occasionally find their way into a hole transport layer, and vice-versa.

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Electrophotographic Imaging Element

Multilayered electrophotographic imaging elements having a separate conductive substrate, charge generation layer, and charge transport layer are described, for example, in U. S. Patent 3,837,851. In operation, light passing through the the transport layer causes the generation of holes and electrons in the charge generation layer. Then, depending upon the nature of the charge transport layer and the charge at the surface of the element, holes or electrons travel through the transport layer to dissipate a portion of the charge at the surface of the element. Most ingredients utilized as transport layers preferentially transport primarily only holes or only electrons. However, it has now been determined, that electrons will occasionally find their way into a hole transport layer, and vice-versa. Failure to dissipate this extraneous charge may have deleterious effects upon the sensitivity or dark decay properties of the imaging element.

This problem is avoided by the inclusion of small amounts of reverse polarity charge transport material with the major charge transport constituent. For example, if holes are to be transported and the transport layer is primarily a hole transport material, then a small quantity of electron transport material would be dispersed throughout the transport layer. For example, if a tri-aryl-pyrazoline compound of the type disclosed in U. S. Patent 3,837,851 is utilized as a hole charge transport material...