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DOT-TRAP PHOTORECEPTOR FOR DIPOLE XEROGRAPHY

IP.com Disclosure Number: IPCOM000024498D
Original Publication Date: 1980-Oct-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 108K

Publishing Venue

Xerox Disclosure Journal

Abstract

An improved photoreceptor structure suitable for dipole xerography is shown in the figure wherein 11 is a leaky or dielectric overcoating depending on the method of charging, 13 is a dot pattern of hole trapping material, 15 is a photogenerator layer such as phthalocyanine or selenium, 17 is a hole transport layer such as polyvinylcarbazole, 19 is an optional layer depending upon the character of layer 11 and the type of charging employed, and 21 is a base electrode. When overcoating 11 is a leaky polymer such as Tedlar (a trademark of E. I. du Pont de Nemours & Co.), the photoreceptor may be contact charged and layer 19 is eliminated. When layer 11 is a dielectric such as polyurethane, a dark injection electrode layer 19 for holes is required for dual charging.

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XEROX DISCLOSURE JOURNAL

DOT-TRAP PHOTORECEPTOR FOR DIPOLE XEROGRAPHY
John W. Weigl

Proposed Classification
U.S. C1. 430/31 Int. C1. G03g 13/00

An improved photoreceptor structure suitable for dipole xerography is shown in the figure wherein 11 is a leaky or dielectric overcoating depending on the method of charging, 13 is a dot pattern of hole trapping material, 15 is a photogenerator layer such as phthalocyanine or selenium, 17 is a hole transport layer such as polyvinylcarbazole, 19 is an optional layer depending upon the character of layer 11 and the type of charging employed, and 21 is a base electrode. When overcoating 11 is a leaky polymer such as Tedlar (a trademark of E. I. du Pont de Nemours & Co.), the photoreceptor may be contact charged and layer 19 is eliminated. When layer 11 is a dielectric such as polyurethane, a dark injection electrode layer 19 for holes is required for dual charging.

The dot pattern of layer 13 traps positive charge selectively while the charge leaks away in the trap-free areas surrounding each dot. The size of the dots is comparable to that of the desired resolvable picture elements. The spacing of the dots should be such that the fringe fields extend above the surface of layer 11.

The processing steps for a leaky dielectric layer 11 are:

1) contact charge with positively biased blade, roller or brush, 2) wait for charge to leak away in the trapfree areas surrounding each dot, 3) expose the image, 4) develop the image using polar or polarizable toner particles, 5) transfer image, and 6) erase.

When an insulating layer 11 is employed, the following two steps are substituted for step 1 in the procedure immediately above:

1) charge negative to induce positive charge to interface and 1A) recharge to zero potential.

Volume 5 Number 5 September/October 1980 565

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