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Thermal Print Head Having Improved Print Quality and Efficiency

IP.com Disclosure Number: IPCOM000044651D
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Bartlett, JC: AUTHOR

Abstract

This article describes how to reduce the delay between the time when energy from heating elements of a thermal print head is applied to a ribbon to print on a sheet of paper and the time when the ribbon is peeled from the sheet of paper. This reduced delay time not only increases the print quality but also increases the efficiency since the ribbon does not have to be heated to as high a temperature with the reduced delay time since it will not cool as much before it is peeled away from the paper. Thus, this reduced energy level to the heating elements not only lowers the operating costs but also decreases the initial cost since the required size of the power supply is reduced.

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Thermal Print Head Having Improved Print Quality and Efficiency

This article describes how to reduce the delay between the time when energy from heating elements of a thermal print head is applied to a ribbon to print on a sheet of paper and the time when the ribbon is peeled from the sheet of paper. This reduced delay time not only increases the print quality but also increases the efficiency since the ribbon does not have to be heated to as high a temperature with the reduced delay time since it will not cool as much before it is peeled away from the paper. Thus, this reduced energy level to the heating elements not only lowers the operating costs but also decreases the initial cost since the required size of the power supply is reduced. Print quality with thermal transfer printing depends upon the time delay between when the ribbon is heated and when it is peeled away from the sheet of paper on which printing is occurring. Since the heating elements of the thermal print head are connected to a common ground which has previously been mounted on the same surface of the print head substrate as the heating elements, this has caused the delay time to be dependent upon the time that it takes for the ribbon to clear the trailing edge of the print head substrate if the carrier velocity is considered constant since

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One way of decreasing this delay time is to mount a common ground 1 (Fig. 2) on a bottom surface 2 of a print head substrate 3 with heating...