Method of making a thin film thermal printhead

Details Method of making a thin film thermal printhead Method of making a thin film thermal printhead

1996-12-05

1997-12-30

Echols, P. W.

Metal working

Method of mechanical manufacture

Electrical device making

216 27, 347201, 451 78, H05B 300

Patent

active

057016593

ABSTRACT:
A thin film thermal printhead is provided which comprises a head substrate having a first longitudinal edge and a second longitudinal edge, a glaze layer formed on a surface of the head substrate, a patterned resistor layer formed as a thin film on the glaze layer to provide a strip of heating dots extending along the first longitudinal edge of the head substrate, and a patterned conductor layer formed on the resistor layer for selectively supplying power to the heating dots. The glaze layer extends from the first longitudinal edge toward the second longitudinal edge of the head substrate, and has a normal flat surface portion and a rounded marginal surface portion continuous with the normal flat surface. The rounded marginal surface portion extends along the first longitudinal edge of the head substrate and progressively approaches the head substrate toward the first longitudinal edge. The heating dots strip is located at least partially at the rounded marginal surface portion of the glaze layer.

REFERENCES:
patent: 3570195 (1971-03-01), Otsuka et al.
patent: 3781515 (1973-12-01), Morris, Jr. et al.
patent: 4651168 (1987-03-01), Terajima et al.
patent: 4915718 (1990-04-01), Desai
patent: 4968996 (1990-11-01), Ebihara et al.
patent: 5367320 (1994-11-01), Taniguchi et al.

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