Browse Prior Art Database

COLOR PRINTER MODIFICATION FOR FLASH BASED COPIER

IP.com Disclosure Number: IPCOM000026393D
Original Publication Date: 1991-Oct-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 71K

Publishing Venue

Xerox Disclosure Journal

Abstract

Proposed is a system that can be used to convert flash based copiers into color printers without losing the copy function. A full frame (full platen) reflective mode (no back light) Liquid Crystal Display (LCD) array is added to the copier in a configuration that allows the LCD to be positioned over the platen during the printer mode, but removed during the copier mode. In the printer mode, information is loaded into the LCD array, a page at a time representing an individual color separation, between exposure cycles. Once a LCD pixel is loaded, it remains in that state until reset.

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XEROX DISCLOSURE JOURNAL

COLOR PRINTER MODIFICATION Proposed Classification

FOR FLASH BASED COPIER

Thomas J. Hammond

U.S. C1.355/232 Int. C1. G03g 15/04

Proposed is a system that can be used to convert flash based copiers into color printers without losing the copy function. A full frame (full platen) reflective mode (no back light) Liquid Crystal Display (LCD) array is added to the copier in a configuration that allows the LCD to be positioned over the platen during the printer mode, but removed during the copier mode. In the printer mode, information is loaded into the LCD array, a page at a time representing an individual color separation, between exposure cycles. Once a LCD pixel is loaded, it remains in that state until reset.

The standard development housing is removed from the copier and replaced with four scavengeless development housings (cyan, magenta, yellow, black). A recirculating transfer roll must also be added to the system.

Once the full LCD page is displayed for a single color separation, the copier lamps are flashed and the information shown on the LCD is imaged onto the photoreceptor just as if the LCD were an input document on the platen. This image is transferred to the copy paper on the recirculating transfer roll. The LCD array is then reloaded with the next color separation and imaged onto the photoreceptor. This process repeats until all four color separations are imaged. Registration is controlled by the timing of the flash pulses. Pres...