Browse Prior Art Database

PHOTORECEPTOR DARK CURRENT DETECTOR WITH FEEDBACK CONTROL

IP.com Disclosure Number: IPCOM000023008D
Original Publication Date: 1976-Jun-30
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 334K

Publishing Venue

Xerox Disclosure Journal

Abstract

Selenium materials such as used for xerographic machines can be very sensitive to temperature changes. Much of the sensitivity is due to increased dark current leakage through the photo- receptor material which is generally exponential with increases in temperature. The ideal photoreceptor, among other properties, should exhibit zero dark current,

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XEROX DISCLOSURE JOURNAL

PHOTORECEPTOR DARK CURRENT Proposed Classification
DETECTOR WITH FEEDBACK CONTROL U0S. Cl, 355/17
C. D, Wilson mt
0 ci0 G03g 13/00

2*

3

FIG. I

Volume 1 Number 6 June 1976 89

FIG. 2

8

I L

FIG~3 I

Selenium materials such as used for xerographic machines can be
very sensitive to temperature changes. Much of the sensitivity
is due to increased dark current leakage through the photo-
receptor material which is generally exponential with increases
in temperature. The ideal photoreceptor, among other properties,
should exhibit zero dark current,

To monitor the dark leakage current of a particular photoreceptor
and thus provides a means to control via appropriate feedback
the changes in the subsequent copy quality, a small section
of the photoreceptor, consisting of base or substrate (1),
selenium (2) and interface (3), is either cut from the

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

Page 2 of 2

PHOTORECEPTOR DARK CURRENT DETECTOR WITH FEEDBACK CONTROL (Cont'd)

photoreceptor or manufactured simultaneously with the photo- receptor
0 Positive and negative terminals (4, 5) are attached by suitable means such as by a conductive epoxy
binder to the base (1) and selenium (2)~ Once formed, the
device looks like a two terminal diode

                              0 To utilize the
device to monitor dark current with respect to temperature,
a voltage (B) is placed across the terminals (4, 5), With
the device in the dark, the current through the device
divided by the area of the device yields...