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A TRANSPARENCY COPYING MACHINE

IP.com Disclosure Number: IPCOM000023407D
Original Publication Date: 1977-Aug-31
Included in the Prior Art Database: 2004-Mar-30
Document File: 2 page(s) / 239K

Publishing Venue

Xerox Disclosure Journal

Abstract

The optical system of an electrophotographic printing machine comprises a screen 22 positioned prior to or subsequent to the path of the light image. Light source 20 projects light rays through screen 22 forming a light image of a screen pattern which irradiates the charged portion of photoconductive sur-face 12 to record a screen pattern thereon. The screen pat-tern moves in the direction of arrow 14 so as to enable the combined light image of composition frame 38 and transparency 24, to be projected in superimposed registration therewith. The resultant electrostatic latent image formed on photocon-ductive surface 12 is modulated.

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XEROX DISCLOSURE JOURNAL

A TRANSPARENCY COPYING MACHINE
ProposedR.M. BobBè Classification

U.S. Cl. 355/3
mt. Cl. G03g 15/00

The optical system of an electrophotographic printing machine
comprises a screen 22 positioned prior to or subsequent to the
path of the light image. Light source 20 projects light rays
through screen 22 forming a light image of a screen pattern
which irradiates the charged portion of photoconductive sur-
face 12 to record a screen pattern thereon. The screen pat-
tern moves in the direction of arrow 14 so as to enable the
combined light image of composition frame 38 and transparency
24, to be projected in superimposed registration therewith.
The resultant electrostatic latent image formed on photocon-
ductive surface 12 is modulated.

U-

Volume 2 Number 4 July/August 1977 77

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

Page 2 of 2

A TRANSPARENCY COPYING MACHINE (Cont'd)

In the pictorial mode of operation, screen member 22 and light
source 20 are operational. Light source 20 is excited by
voltage source 88. In the functional mode of operation,
wherein an unmodulated electrostatic latent image is recorded
on photoconductive surface 12, voltage source 88 is de-
energized, thereby de-activating light source 20~ This pre-
cludes the formation of a light image of the screen pattern.
Thus, the single light image irradiating the charged portion
of photoconductive surface 12 is unmodulated.

                 XEROX DISCLOSURE JOURNAL
78 Volume 2 Number 4 July/August 1977

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