Wear-resistant protective film for thermal printing heads

Details Wear-resistant protective film for thermal printing heads Wear-resistant protective film for thermal printing heads

1995-01-13

1997-01-07

Hilten, John S.

Typewriting machines

Typing by other than type-face or type-die

Thermal

347171, 347203, B41J 2335

Patent

active

055909698

ABSTRACT:
A wear-resistant protective film for thermal printing heads comprising Si, O, and N as principal constituent elements, contains additionally at least one alkaline earth metal selected from the group consisting of Be, Mg, Ca, Sr, Ba, and Ra. Preferably, the film has a composition SiM.sub.x O.sub.y N.sub.z in which M stands for an alkaline earth metal, x is 0.01-0.5, y is 0.1-2.0, and z is 0.2-1.8.

REFERENCES:
patent: 4400100 (1983-08-01), Aviram
patent: 4835548 (1989-05-01), Nikadio
patent: 4862195 (1989-08-01), Kato
patent: 5225951 (1993-07-01), Kira et al.

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