Browse Prior Art Database

DEVELOPMENT SYSTEM CONTROLLER

IP.com Disclosure Number: IPCOM000023212D
Original Publication Date: 1977-Feb-28
Included in the Prior Art Database: 2004-Mar-29
Document File: 2 page(s) / 319K

Publishing Venue

Xerox Disclosure Journal

Abstract

In an electrophotographic printing machine, the bias on the developer rolls and the concentration of toner particles within the developer mix may be controlled. One type of control system employs a disc 22 having different density reference samples 38, 40 and 42. Before scan lamps 26 illuminate the original document, one of the reference den-sity samples is irradiated, The light image is projected through lens 18 and filter 20 onto charged photoconductive surface 12 in the non-image area thereof. The light image discharges the charged photoconductive surface recording a sample electrostatic latent image thereon. The potential of the sample electrostatic latent image recorded on photo-conductive surface 12 is detected by probe 28, i.e., a suitable electrometer disposed adjacent to photoconductive surface 12 between exposure station B and development sta-tion C. The electrical output signal from probe 28 is

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XEROX DISCLOSURE JOURNAL

DEVELOPMENT SYSTEM CONTROLLER James R. Davidson

Proposed Classification
U.S. Cl, 317/4 mt. Cl. H05b

In an electrophotographic printing machine, the bias on the
developer rolls and the concentration of toner particles
within the developer mix may be controlled. One type of
control system employs a disc 22 having different density
reference samples 38, 40 and 42. Before scan lamps 26
illuminate the original document, one of the reference den-
sity samples is irradiated, The light image is projected
through lens 18 and filter 20 onto charged photoconductive
surface 12 in the non-image area thereof. The light image
discharges the charged photoconductive surface recording a
sample electrostatic latent image thereon. The potential
of the sample electrostatic latent image recorded on photo-
conductive surface 12 is detected by probe 28, i.e., a
suitable electrometer disposed adjacent to photoconductive
surface 12 between exposure station B and development sta-
tion C. The electrical output signal from probe 28 is

Volume 2 Number 1 January/February 1977 41

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

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DEVELOPMENT SYSTEM CONTROLLER (Cont'd)

processed by circuit element 30 which regulates the elec-
trical bias applied to each of the developer units 46, 48
and 50 of the respective development station. The sample
electrostatic latent image recorded on photoconductive
surface 12 is developed and continues to rotate with drum
10 so that the light rays...