Browse Prior Art Database

Thermal Transfer Printer Employing Special Ribbons Heated with a Current Pulse

IP.com Disclosure Number: IPCOM000084914D
Original Publication Date: 1976-Jan-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Mitchell, JL: AUTHOR [+2]

Abstract

This is a thermal printer 2 in which a resistive element 4 comprised of a substrate of a resistive material having a resistivity between 50 to 2000 ohms/sq is coated or impregnated with a thermally transferable ink. For example, the element 4 may be a paper having a resistivity on the order of 100 ohms/sq by including carbon fibres. Alternatively, carbon fibres could be woven into a cloth to form a suitable substrate.

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Thermal Transfer Printer Employing Special Ribbons Heated with a Current Pulse

This is a thermal printer 2 in which a resistive element 4 comprised of a substrate of a resistive material having a resistivity between 50 to 2000 ohms/sq is coated or impregnated with a thermally transferable ink. For example, the element 4 may be a paper having a resistivity on the order of 100 ohms/sq by including carbon fibres. Alternatively, carbon fibres could be woven into a cloth to form a suitable substrate.

A character generator 8 selectively applies current pulses to a point electrode 10 which is in contact with the element 4. Current flows from the electrode 10 through a region 12 in the element 4 to a broad base ground electrode 14, with the current density in the region 12 being sufficient to cause I/2/R heating which transfers ink from the region 12 in the element 4 to a paper 6. An array of electrodes may be used to form a matrix printer.

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