Browse Prior Art Database

DIPOLE IMAGING USING WHITE DOT SCREENS

IP.com Disclosure Number: IPCOM000024995D
Original Publication Date: 1983-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 46K

Publishing Venue

Xerox Disclosure Journal

Abstract

In order to utilize dipole marking particles in the development system of an electrophotographic printing machine, the latent image must be spacially modu-lated to obtain solid area coverage. A method of obtaining spacial modulation in positive to positive copying is to expose the photoconductive surface to an optical screen pattern before or after image exposure. Modulation may also be achieved by placing an opaque white dot screen on the platen of the printing machine. The original document being reproduced is then positioned on the dot screen. The charged photoconductive surface is exposed to the white dot screen and original simultaneously creating a modulated latent image. The latent image is modulated in the light absorbing areas only. This approach eliminates the requirement for using a screen in the optical system and increases exposure latitude over the pre and post screen exposure process.

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 100% of the total text.

Page 1 of 2

IEROX DISCLOSURE JOURNAL

DIPOLE IMAGING USING WHITE DOT

L. F. Bean

Proposed Classification

355/3 Cl. U.S. SCREENS Int. Cl. G03g 15/00

In order to utilize dipole marking particles in the development system of an electrophotographic printing machine, the latent image must be spacially modu- lated to obtain solid area coverage. A method of obtaining spacial modulation in positive to positive copying is to expose the photoconductive surface to an optical screen pattern before or after image exposure. Modulation may also be achieved by placing an opaque white dot screen on the platen of the printing machine. The original document being reproduced is then positioned on the dot screen. The charged photoconductive surface is exposed to the white dot screen and original simultaneously creating a modulated latent image. The latent image is modulated in the light absorbing areas only. This approach eliminates the requirement for using a screen in the optical system and increases exposure latitude over the pre and post screen exposure process.

I

Volume 8 Number 2 March/April 1983

111

[This page contains 1 picture or other non-text object]

Page 2 of 2

  XEROX DISCLOSURE JOURNAL Volume 8 Number 2 March/April 1983

112

[This page contains 1 picture or other non-text object]