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Pulse Correction Scheme for Thermal Transfer Print

IP.com Disclosure Number: IPCOM000118009D
Original Publication Date: 1996-Aug-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Decker, WC: AUTHOR [+3]

Abstract

In thermal transfer printing an electrode is "fired" or activated to cause the melting of that part of a colored ribbon in front of the electrode. The melted part of the ribbon then transfers to the paper leaving a colored spot on the paper. The energy required to supply to the printhead causes the printhead to reach a transition temperature before it reaches its final temperature. The transition temperature is the temperature of the electrode just prior to firing when printing a dot at the maximum printing rate. Ambient temperature in the printer and the electrode resistance changes affect the energy required for each electrode to reach the desired transition temperature.

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

Pulse Correction Scheme for Thermal Transfer Print

      In thermal transfer printing an electrode is "fired" or
activated to cause the melting of that part of a colored ribbon in
front of the electrode.  The melted part of the ribbon then transfers
to the  paper leaving a colored spot on the paper.  The energy
required to supply  to the printhead causes the printhead to reach a
transition temperature  before it reaches its final temperature.  The
transition temperature is  the temperature of the electrode just
prior to firing when printing a dot at the maximum printing rate.
Ambient temperature in the printer and the electrode resistance
changes affect the energy required for each  electrode to reach the
desired transition temperature.

      Ambient temperature is dependent upon the environment in which
the printer is placed and upon the duty cycle at which the printer is
utilized.  As the ambient temperature increases, the energy required
for the electrode to reach its transition temperature decreases.
This can be accomplished by decreasing the pulse width of the pulses
used to  maintain a constant head temperature (transition
temperature).  A thermal  sensor or temperature measuring device can
be placed in the vicinity of  the printhead, preferably at the base
to which the printhead is attached.  Additional sensors in the
vicinity of the ribbon supply may  or may not be required.  The
output of the sensor is such that it produces a proportionately
smal...