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Browse Prior Art Database

Variable Flash Fuser Energy as a Function of Print Area Coverage

IP.com Disclosure Number: IPCOM000109895D
Original Publication Date: 1992-Sep-01
Included in the Prior Art Database: 2005-Mar-24
Document File: 2 page(s) / 107K

Publishing Venue

IBM

Related People

Baumann, G: AUTHOR [+10]

Abstract

In the fusing described herein, toner is fused to the paper in a fuser module by radiant energy provided by flash lamps. Disclosed is a means of controlling the fuse energy in the flash fuser as a function of the surface area of toner to be fused fusing each flash. This method of control is used in conjunction with an appropriate energy versus toner area algorithm to obtain fused prints of uniform optical density with reduced volatile generation. In addition, component life, average power consumption and contamination in the fuser are optimized.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Variable Flash Fuser Energy as a Function of Print Area Coverage

       In the fusing described herein, toner is fused to the
paper in a fuser module by radiant energy provided by flash lamps.
Disclosed is a means of controlling the fuse energy in the flash
fuser as a function of the surface area of toner to be fused fusing
each flash.  This method of control is used in conjunction with an
appropriate energy versus toner area algorithm to obtain fused prints
of uniform optical density with reduced volatile generation.  In
addition, component life, average power consumption and contamination
in the fuser are optimized.

      The fusing system consists of a set of flash tubes, trigger
circuits, power supplies, and control circuits to operate the system.
The number of flash tubes, triggers and supplies is determined by
paper speed, flash exposure footprint, and flash repetition rate.
The fuser controller must set flash intensity levels to which the
power supplies charge, and then trigger the tubes in sequence as a
function of paper position in the fuser module.  The area of toner in
each flash footprint is determined by counting the number of print
elements (PELs) exposed in each footprint, and this count controls
the flash energy.

      To implement control of the fuser, three counters are required.
These are the PEL counter, the PEL segment counter and the paper
position counter.  A microprocessor is used in conjunction with these
counters to provide control of the fusing process.

      The PEL segment counter measures the length of photoconductor
passed underneath the printhead and initiates the reading of the PEL
counter.  This counter is clocked by the photoconductor loop encoder
to measure a length value which is loaded into the counter.  Upon
completion of the count, the microprocessor is interrupted, causing
the PEL counter to be read, and the count length is the interval over
which PEL count data is collected.

      The PEL counter is clocked by a signal representing the number
of exposed PELs on the photoconductor.  The value of this counter is
read every time the PEL segment counter interrupts the processor at
the count length intervals.  The counter is not reset after it is
read, and its range is large enough to prevent loss of PEL data
between reads.

      The paper position counter is an up-down counter clocked by the
tractor encoder.  Signals clocking this counter are bidirectional to
accommodate both forward and reverse motion of the tractors.  This
counter provides position information of printed image on the paper
in the fuser, and is used to control the flash power system to tim...