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AssigneeRohm Co., Ltd.
InventorsHideo Taniguchi, Shinobu Obata, Hiroshi Kinoshita
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A thermal printhead according to the present invention includes a substrate (2) of an insulating material, a heating resistor (3) formed on the substrate (2) to form a plurality of heating dots, a conductor pattern (5, 6) formed on the substrate (2) for electrical connection to the heating resistor (3), and driving elements mounted on the substrate (2) for selectively heating the heating dots via the conductor pattern (5, 6). The substrate (2) has, at the position of the heating resistor (3), a raised portion (2a) and the substrate (2) has, in its wall thickness at the position of the raised portion (2a), a hollow portion (10) extending along the heating resistor (3). The present invention also provides a method for making the substrate (2).
A thermal printhead comprising:
An integral substrate made only of a homogeneous insulating material for a thermal printhead, the substrate having a flat mounting surface, wherein the substrate has, on the flat mounting surface thereof, a longitudinal integral raised portion, and the substrate has, in its wall thickness, an elongated hollow portion extending longitudinally of the raised portion at a position of the raised portion, the hollow portion being closed at both ends as viewed in its extending direction, the hollow portion projecting beyond the flat mounting surface of the substrate.
Dependencies are inferred from the claim text.