Browse Prior Art Database

Full Color EP With a Single Paper-Registered, Monocolor Imager

IP.com Disclosure Number: IPCOM000036825D
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Diaz, AF: AUTHOR [+4]

Abstract

A new process for doing full color EP printing and copying, where the image and development occurs at the same time and directly on the paper, is shown in the figure. The process uses photoactive toner for jump gap development in combination with a full-page liquid crystal shutter printhead for generating full color images. The process uses a web A onto which the toner is applied. The web is transparent to allow back-side imaging and has an electrically conducting surface. Each of the toners is applied to a separate region on the web, requiring the use of three different developers and cleaners, as shown. The developers/cleaners can be three discrete units or could be on a turret system, which rotates to bring each color developer station into contact (or close spacing) with the transparent conductive belt.

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Full Color EP With a Single Paper-Registered, Monocolor Imager

A new process for doing full color EP printing and copying, where the image and development occurs at the same time and directly on the paper, is shown in the figure. The process uses photoactive toner for jump gap development in combination with a full-page liquid crystal shutter printhead for generating full color images. The process uses a web A onto which the toner is applied. The web is transparent to allow back-side imaging and has an electrically conducting surface. Each of the toners is applied to a separate region on the web, requiring the use of three different developers and cleaners, as shown. The developers/cleaners can be three discrete units or could be on a turret system, which rotates to bring each color developer station into contact (or close spacing) with the transparent conductive belt. For this configuration, the printhead (B) is placed inside the web and the web is positioned opposite a conducting plate (C). The printhead is a combination of a planar light source and an array of liquid crystal shutters with the physical dimensions for imaging full-size paper. The full image for each color is loaded onto the printhead for imaging. Registration of the colors is not a serious problem because the printhead and the paper are held stationary while each color is developed. An electric field is maintained across the gap between the web A and the conducting plate C (electrical ground). T...