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Browse Prior Art Database

PHOTOCONDUCTOR WITH NON-ALTERABLE MARK

IP.com Disclosure Number: IPCOM000026156D
Original Publication Date: 1990-Aug-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 4 page(s) / 205K

Publishing Venue

Xerox Disclosure Journal

Abstract

In certain electroreprographic machines it is desirable for customers to apply an identifying mark to all copies made on the machine. For example, organizations may wish to apply a logo to all copies produced, or a government printing office may wish to apply a security classification to all copies produced.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 54% of the total text.

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XEROX DISCLOSURE JOURNAL

PHOTOCONDUCTOR WITH NON- ALTERABLE MARK
Raymond W. Huggins
Kenneth W. Pietrowski

Proposed Classification
U.S. C1.355/211 Int. C1. G03g 5/00

19

15

FIG. 7

XEROX DISCLOSURE JOURNAL - Vol. 15, No. 4 July/August 1990 243

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PHOTOCONDUCTOR WITH NON-ALTERABLE MARK(Cont'd)

FIG. 2

In certain electroreprographic machines it is desirable for customers to apply an identifying mark to all copies made on the machine. For example, organizations may wish to apply a logo to all copies produced, or a government printing office may wish to apply a security classification to all copies produced.

U.S. Patent No. 4,456,373 to Best discloses a means for producing a secondary image with the image to be copied. A transparent substrate with a secondary image is placed on a transparent platen. When a copy is made, the secondary image and the primary image, from the original document, appear together on the copy.

U.S. Patent No. 4,251,252 to Miyakawa et al. discloses a reproduction device for producing two or more images on a dielectric or photoelectric material. The first image is formed by projecting a light image on a photoconductor. Subsequent images are formed by direct charging of a dielectric substrate in which images are perforated, the perforations allowing the passage of charge and thereby effecting selective charging of the photoelectric material according to the perforated areas.

Output of this type is possible in electroreprographic machines employing a photosensitive member as disclosed in US. Patent No. 4,265,990 to Stolka et al.. Figure 1 is a schematic illustration of such a photoconductor 11, comprising an aluminized Mylar* substrate 11, with Mylar@ and aluminum

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244 XEROX DISCLOSURE JOURNAL - Vol. 15, No. 4 July/August 1990

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PHOTOCONDUCTOR WITH NON-ALTERABLE MARK(Cont'd)

layers 13; 15 respectively, having a trigonal selenium charge generating layer 17, deposited thereon, and a charge transport layer 19, subsequently deposited on charge generating layer 17.

Furthermore, it has been determined that oxidation of the conductive aluminum substrate layer 15, effectively deters charge decay in the the photoconductive layers located directly above the oxidized areas 21. Moreover, this lack of charge decay results in the attraction of developer material used for production of the images and thereby produces a latent image on the photoconductive surface that is a rendition of the oxidation pattern...