Browse Prior Art Database

A SE-FREE INFRARED-SENSITIVE XEROPRINTING MASTER

IP.com Disclosure Number: IPCOM000027379D
Original Publication Date: 1996-Aug-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 4 page(s) / 263K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is an infrared-sensitive (IR) imaging structure useful as a xeroprinting master material which is free of selenium (Se). The structure can be fabricated by conventional coating process and can be applied to a wide variety of photosensitive materials including organic pigments. The xeroprinting master-making procedure is a totally dry process which can be practically implemented in a machine even in an office environment. IR imaging sensitivity is high and the master provides high voltage contrast.

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 35% of the total text.

Page 1 of 4

XEROX DISCLOSURE JOURNAL

A SE-FREE INFRARED-SENSITIVE XEROPRINTING MASTER
Man C. Tam

Edward G. Zwartz

Proposed Classification
U. S. C1.355/211 Int. C1. G30g 05/00

. .

1

&selenium Particles

Matrix Polymer

+ photoactive pigment

Aluminum

Su brtrate

Fig. l(a) NMEP

Selenium Particles

Aluminum

Substrate

Matrix Polymer

+ photoactive pigment

Aluminum

5 u bstrate

Fig. l(b) IR NMEP

Fig. 2 Se Free Imaging Structure

XEROX DISCLOSURE JOURNAL - Vol. 21, NO. 4 JulylAUguSt 1996 255

[This page contains 3 pictures or other non-text objects]

Page 2 of 4

A SE-FREE INFRARED-SENSITIVE XEROPRINTING MASTER (CON'TD)

Disclosed is an infrared-sensitive (IR) imaging structure useful as a xeroprinting master material which is free of selenium (Se). The structure can be fabricated by conventional coating process and can be applied to a wide variety of photosensitive materials including organic pigments. The xeroprinting master-making procedure is a totally dry process which can be practically implemented in a machine even in an office environment. IR imaging sensitivity is high and the master provides high voltage contrast.

Very high quality (>2,000 spi), high speed (>lo0 ppm) electronic printing, especially color, can be very difPicult and/or expensive to accomplish with conventional laser xerography, because repetitive imagewise exposure steps impose severe requirements on digital data storage and data transmission rate.

A xeromaster-based printing process overcomes these limitations by making a single, comparatively slower but high resolution, imagewise exposure per color to produce the printing master from which repetitive printing can be performed at high speed. Since the master-making process needs to be performed only once, it has little adverse impact on overall system speed (job time) for jobs of longer runlength.

A blue-green sensitive negatively charged migration eletrophotographic positive (NMEP) xeroprinting technology has been previously disclosed' . An infrared-sensitive version, i.e., IR NMEP, has also been developed2 - Infrared imaging sensitivity is desired to enable use of solid-state IR diode laser scanning system which offers advantages including lower cost and compact physical size. NMEP and IR NMEP masters are suitable for high-quality high-speed color printing applications.

The imaging structures of NMEP and IR NMEP are shown in Figs. l(a) and l(b), respectively. These devices use a vacuum-deposited monolayer of amorphous selenium spheres as the migration material.

A possible simple approach to a Se-Eree IR sensitive device would be to deposit by vacuum evaporation of an IR-sensitive organic pigment in the NMEP structure in place of Se. This approach was found unsuccessful since the unique fabrication process which produces a subsurface particulate structure generally works only with low-melting inorganic materials like Se or its alloys.

The Se-free imaging structure of the present disclosure exhibits high IR sensitivity and can be proc...