Ribbon configuration for resistive ribbon thermal transfer print

Details Ribbon configuration for resistive ribbon thermal transfer print Ribbon configuration for resistive ribbon thermal transfer print

1979-12-26

1982-01-05

Wright, Jr., Ernest T.

Surgery

Specula

Retractor

400120, 346 76PH, 428411, B41J 3102

Patent

active

043091172

ABSTRACT:
A resistive ribbon thermal transfer printing apparatus has an improved ribbon configuration. The ribbon contains a two-ply resistive element positioned on a conductive layer. The resistive element contains a top layer having a low resistance, for example 3.times.10.sup.-5 .OMEGA. for making contact with the writing head and a bottom layer having a higher resistance, for example 1.times.10.sup.-3 .OMEGA. in contact with the conductive layer for generating heat. The ratio of the resistance of the high resistance layer to the resistance of the low resistance layer, R.sub.H /R.sub.L, is 1.1 to 1000. An example of such a ribbon contains a top resistive layer of polyimide containing 35% conductive carbon, a bottom resistive layer of a SiO/Cr cermet (60%/40%), a stainless steel conductive layer and a Versamid ink layer.

REFERENCES:
patent: 3072543 (1963-01-01), Lubow et al.
patent: 3377599 (1968-04-01), Reis
patent: 3442699 (1969-05-01), Dalton
patent: 3744611 (1973-07-01), Montanari et al.
patent: 4103066 (1978-07-01), Brooks et al.
IBM Technical Disclosure Bulletin, "Thermal Display Printer", Kitamura, vol. 16, No. 7, Dec. 1973, p. 2189.
IBM Technical Disclosure Bulletin, "Resistive Ribbon Thermal Transfer Printing Method", Crooks et al., vol. 19, No. 11, Apr. 1977, p. 4396.
IBM Technical Disclosure Bulletin, "Resistive Ribbon Printing of Typewriter Keys", Wilbur, vol. 20, No. 12, May 1978, p. 5314.
IBM Technical Disclosure Bulletin, "Integrated Polyacetylene Structure for Resistive Ribbon Thermal Transfer Printing", Clarke et al., vol. 21, No. 12, May 1979, p. 5011.
IBM Technical Disclosure Bulletin, "Resistive Ribbon Ink Layers", Crooks et al., vol. 22, No. 2, Jul. 1979, p. 782.
European Patent Application, 9,595, "Electrothermal Printing Apparatus", Wilbur, Published 4/16/80.

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