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SCREEN CORONA CHARGING

IP.com Disclosure Number: IPCOM000022921D
Original Publication Date: 1976-Apr-30
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 202K

Publishing Venue

Xerox Disclosure Journal

Abstract

In ha1f~tone printing, a modulated charge pattern is recorded on a photoconductive surface. The foregoing may be achieved by corona charging device 10. Corona charging device includes a substantially tJ~shaped shield 12 having a pair of coronode wires 14 extending parallel to one another along the longitudinal axis of shield 12, A plurality of screen wires 16 extend substantially normal to coronode wires 14, Screen wires 16 are sub~ stantially parallel to the direction of rotation of the photoconductive drum. In this way, the electrostatic charge pattern recorded on the photoconductive surface is modulated. The screen wires may have a bias applied thereto to create a desired modulated charge or they remain

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

SCREEN CORONA CHARGING Proposed Classification
L. Barbieri U.S. Cl. 313/236

mt. Cl. HOlj 1/00

In ha1f~tone printing, a modulated charge pattern is
recorded on a photoconductive surface. The foregoing
may be achieved by corona charging device 10. Corona
charging device includes a substantially tJ~shaped shield
12 having a pair of coronode wires 14 extending parallel
to one another along the longitudinal axis of shield 12,
A plurality of screen wires 16 extend substantially
normal to coronode wires 14, Screen wires 16 are sub~
stantially parallel to the direction of rotation of the
photoconductive drum. In this way, the electrostatic
charge pattern recorded on the photoconductive surface
is modulated. The screen wires may have a bias applied
thereto to create a desired modulated charge or they remain

unbiased and merely act as regions preventing charging
from the coronode wires 14, Depending upon the desired
half tone image, the screen wire frequency may be about

85 lines per inch,

Volume 1 Number 4 April 1976 69

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Page 2 of 2

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70 XEROX DISCLOSURE JOURNAL

Volume 1 Number 4 April 1976

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