Browse Prior Art Database

A METHOD OF EXTENDING PHOTO-RECEPTOR LIFE

IP.com Disclosure Number: IPCOM000024883D
Original Publication Date: 1982-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 73K

Publishing Venue

Xerox Disclosure Journal

Abstract

One of the limitations in reproducing high quality copies is the characteristics of the photoconductive belt. Frequently, the charge retained on the photoconductive belt in the region of the electrostatic latent image tends to decrease during any one cycle as a function of the number of consecutive copies being made during that run. If uncorrected, this decrease in image potential results in an unacceptably light copy after long runs or high daily usage. In order to overcome this problem, a control system is utilized to adjust the charging current between runs so as to counteract decrease in retained charging current. However, when the photo-conductive member is rested for a period of time, it returns to its original condition. If the charging current is left at its previously higher value, the initial number of copies being reproduced will have higher than the desired image potential. The control system detects the image potential and reduces the charging current to restore the image potential to the desired level. However, these overdeveloped copies are undesirable and may result in extra service calls which may be avoided. The foregoing problem may be overcome by having the control system reset the charging current to its original value, i.e., the value of charging current prior to the current correction requested by the controller since the last rest period. Thus, the control system operates in essentially two modes, in one mode, continually increasing the charging current during a long run or during prolonged usage for any given day as the image potential retained on the photoreceptor decreases. In a second mode, the control system automatically resets the charging current to the initial value prior after the photoreceptor has undergone a long rest period.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 70% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

A METHOD OF EXTENDING PHOTO- RECEPTOR LIFE U.S. c1. 355/3
R. E. Grace
J. He Robinson

Proposed Classification

Int. C1. G03g 15/00

One of the limitations in reproducing high quality copies is the characteristics of the photoconductive belt. Frequently, the charge retained on the photoconductive belt in the region of the electrostatic latent image tends to decrease during any one cycle as a function of the number of consecutive copies being made during that run. If uncorrected, this decrease in image potential results in an unacceptably light copy after long runs or high daily usage. In order to overcome this problem, a control system is utilized to adjust the charging current between runs so as to counteract decrease in retained charging current. However, when the photo- conductive member is rested for a period of time, it returns to its original condition. If the charging current is left at its previously higher value, the initial number of copies being reproduced will have higher than the desired image potential. The control system detects the image potential and reduces the charging current to restore the image potential to the desired level. However, these overdeveloped copies are undesirable and may result in extra service calls which may be avoided. The foregoing problem may be overcome by having the control system reset the charging current to its original value, i.e., the value of charging current prior to the current correction req...