Incremental printing of symbolic information – Ink jet – Ejector mechanism
Patent
1993-06-22
1995-09-05
Reinhart, Mark J.
Incremental printing of symbolic information
Ink jet
Ejector mechanism
428681, G01D 1518
Patent
active
054482739
ABSTRACT:
In a thermal ink jet printhead with a protective layer, the protective layer is made of a thin film material having a melting point not less than about 1000.degree. C. A deposition process for preparing the thin film material produces a thin film material having, at an operating temperature for the thermal ink jet printer, a thermal conductivity coefficient not less than about 10 W/m.K, a compressive yield strength not less than about 1400 MPa, and a compressive residual stress of not greater than about 1200 MPa. The protective layer is smooth, substantially free of pores and impervious to stress corrosion or hydrogen stress cracking at a hydrogen uptake rate of less than about 5 ppm. The protective layer may also contain an adhesion enhancing region between the protective layer and an underlying layer or an anodic region contiguous with an underlying thin film material of the protective layer. The adhesion enhancing region is a reaction product between an ambient gas and the thin film material of the protective layer and extends only to the grain boundaries of the protective layer. The contiguous anodic region is substantially free of pores, has a homogeneous composition, protects an underlying thin film material against corrosive species and hydrogen and is formed by anodization of the underlying thin film in an aqueous electrolytic process.
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Apollonio Renato P.
Burke Cathie J.
Klein Igal E.
Lorenze Robert V.
Proano Roberto E.
Lund Valerie Ann
Reinhart Mark J.
Xerox Corporation
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