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Pulse Width Energy Control for "Resistive Ribbon Thermal Transfer" Printer Using Pel Counting

IP.com Disclosure Number: IPCOM000041088D
Original Publication Date: 1987-Jul-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Countryman, GP: AUTHOR [+2]

Abstract

A resistive ribbon thermal transfer printing system is described in which the energy supplied at each print electrode is controlled for each pel to be printed so that the minimum temperature is reached in the ribbon necessary to cause the proper amount of ink to be transferred to the paper. This is accomplished by using an open loop method which controls the energy supplied by the print electrode drivers by adjusting the pulse width of the drive signal for each print column according to how many pels are being printed in that column.

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Pulse Width Energy Control for "Resistive Ribbon Thermal Transfer" Printer Using Pel Counting

A resistive ribbon thermal transfer printing system is described in which the energy supplied at each print electrode is controlled for each pel to be printed so that the minimum temperature is reached in the ribbon necessary to cause the proper amount of ink to be transferred to the paper. This is accomplished by using an open loop method which controls the energy supplied by the print electrode drivers by adjusting the pulse width of the drive signal for each print column according to how many pels are being printed in that column.

The printing system utilizes a thermal transfer printing ribbon having a resistive substrate as the active electrical heating circuit and a conductive inner layer which serves as a common electrical path. The print head has a plurality of print electrodes which are in contact with the resistive substrate and are selectively energized to produce the desired print pattern.

Higher print speeds and improved character appearance can be achieved by controlling the energy supplied at each print electrode for each pel to be printed by adjusting the pulse width of the drive signal for each print column according to how many pels are being printed in that column. This control is open loop since it does not actually rely on measurement of ribbon temperatures to control the energy supplied, but adjusts the energy supplied based on the value generated by...