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Browse Prior Art Database

A VARIABLE CONTRAST OPTICAL SPEED SYSTEM

IP.com Disclosure Number: IPCOM000023525D
Original Publication Date: 1977-Dec-31
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 362K

Publishing Venue

Xerox Disclosure Journal

Abstract

The exposure station of an electrophotographic printing machine has original document 22 disposed upon transparent platen 28. The original document is illuminated by light source 30. The light rays reflected from original document 22 are directed by mirror 32 through lens 24 and filter mechanism 26. Filter mechanism 26 interposes a selected color filter into the optical light path. The resultant single color light image is then reflected by mirror 34 onto photoconductive sur-face 12 in superimposed registration with a screen pattern recorded thereon.

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Page 1 of 2

XEROX DISQLOSURE JOURNAL

A VARIABLE CONTRAST OPTICAL
SPEED SYSTEM
Richard M, Bobbe

Proposed Classification
U.S. Cl. 96/lR
mt. CL G03g

~22~

The exposure station of an electrophotographic printing
machine has original document 22 disposed upon transparent
platen 28. The original document is illuminated by light
source 30. The light rays reflected from original document 22
are directed by mirror 32 through lens 24 and filter mechanism
26. Filter mechanism 26 interposes a selected color filter
into the optical light path. The resultant single color light
image is then reflected by mirror 34 onto photoconductive sur~
face 12 in superimposed registration with a screen pattern
recorded thereon.

24

/8

Volume 2 Number 6 November/December 1977 9

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

Page 2 of 2

A VARIABLE CONTRAST OPTICAL SPEED SYSTEM (Cont~d)

Timing wheel 76 is mounted on the shaft of the drum of the
electrophotographic printing machine, The timing wheel
comprises a plurality of slits 78 in the outer periphery
thereof. In one position, a second slit 80 is located beneath
one of slits 78. In this way, after each 360° rotation of
timing wheel 76, two slits are positioned in alignment with

light source 82 permitting light rays to be transmitted there-
through. Timing wheel 76 is substantially opaque. The light
rays transmitted through slits 78 and 80 are detected by pho-
tosensors or photodarlingtons 84 and 88, Photodarlingtons 84
and 88 develop electrical output signals when en...