Browse Prior Art Database

PHOTORECEPTOR CHANGE DETECTION

IP.com Disclosure Number: IPCOM000027597D
Original Publication Date: 1998-Feb-28
Included in the Prior Art Database: 2004-Apr-08
Document File: 2 page(s) / 98K

Publishing Venue

Xerox Disclosure Journal

Abstract

In order to monitor the photoreceptor life the copier needs to know when the photoreceptor has been changed. With power turned off there is no way to know if it has been replaced. However, by monitoring the aging of the photoreceptor through its electrostatics, the current photoreceptor can be characterized and recorded. When this electrostatic signature changes it can be deduced that the photoreceptor has been changed. This allows the age of the photoreceptor to be known through a software counter without requiring the customer to reset a counter.

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XEROX DISCLOSURE JOURNAL

PHOTORECEPTOR CHANGE DETECTION Proposed Classification David J. Breed U. S. C1.399/116

Int. C1. G03g 15/02

In order to monitor the photoreceptor life the copier needs to know when the photoreceptor has been changed. With power turned off there is no way to know if it has been replaced. However, by monitoring the aging of the photoreceptor through its electrostatics, the current photoreceptor can be characterized and recorded. When this electrostatic signature changes it can be deduced that the photoreceptor has been changed. This allows the age of the photoreceptor to be known through a software counter without requiring the customer to reset a counter.

The photoreceptor of the Xerox 5028 family is customer replaceable and guaranteed for a given life. This Customer Replaceable Unit (CRU) life is controlled through a mechanical counter activated by software. There is a color coded window on the counter which shows a different color for the second half of the CRU life. By monitoring the photoreceptor aging, the unit is replaced only after it has been fully utilized rather than at a designated hard stop (e.g. for example, every 25k copies).

A technical representative needs to know roughly how old the cartridge is when trying to diagnose a problem. The present counter can be eliminated if the approximate age of the CRU in the machine could be determined without it. Using a simple software counter when a new CRU is installed, enables the copier software to compare the electrostatics of the new CRU against the recorded signature of the old CRU and determine if a new CRU has been installed. If so, the software counter for the CRU resets wi...