Browse Prior Art Database

Method of Setting the Operating Point of an Electrophotographic Printer To Match the Cartridge Characteristics

IP.com Disclosure Number: IPCOM000102568D
Original Publication Date: 1990-Dec-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 67K

Publishing Venue

IBM

Related People

Campbell, AS: AUTHOR [+2]

Abstract

The quality of print produced by an electrophotographic printer and the ultimate yield of the toner cartridge are very dependent on the operating point selected for the machine. Among other things, the operating point consists of electronic reference levels which are typically set in the code at the time of manufacture and then remain fixed. Examples of these reference levels include laser power, laser duty cycle and white and black dot compensation. Generally, one variable, like developer bias, is left as an adjustment for light to dark print control. The process of providing replacement cartridges with consistent performance is made unnecessarily restrictive by the fact that the other variables have been fixed and no convenient means exists to change them.

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This is the abbreviated version, containing approximately 52% of the total text.

Method of Setting the Operating Point of an Electrophotographic Printer To Match the Cartridge Characteristics

       The quality of print produced by an electrophotographic
printer and the ultimate yield of the toner cartridge are very
dependent on the operating point selected for the machine.  Among
other things, the operating point consists of electronic reference
levels which are typically set in the code at the time of manufacture
and then remain fixed. Examples of these reference levels include
laser power, laser duty cycle and white and black dot compensation.
Generally, one variable, like developer bias, is left as an
adjustment for light to dark print control.  The process of providing
replacement cartridges with consistent performance is made
unnecessarily restrictive by the fact that the other variables have
been fixed and no convenient means exists to change them.
Replacement cartridges must closely replicate the characteristics of
the original photoconductor drums, toners, etc., in order to provide
consistent performance. If all of the operating point variables could
be changed for each replacement cartridge, a wider range of
tolerances could be used for its components.  It would also be easier
to implement changes to the components for improved cost or function
since the operating point would be variable.  This invention provides
a means for changing the operating point to meet the requirements of
each replacement cartridge with minimal impact to the operator.

      Replacement cartridges would come with a Cartridge Operating
Point (COP) card which would provide the machine with the operating
point information needed for that cartridge.  When the cartridge is
first installed, the card w...