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US 7,443,409 B2Granted
Thermal printhead
AssigneeRohm Co., Ltd.
InventorTeruhisa Sako
Life of this patent
Estimating the term…
Abstract
A thermal printhead (A) according to the present invention includes a heating resistor (5) formed on a substrate (1), an electrode (3) for energizing the heating resistor (5), and a protection film (6) for covering the heating resistor (5) and the electrode (3). The protection film (6) has a surface with a ten-point mean roughness of no smaller than 0.2 μm.
Claims2
A thermal printhead comprising:
- a heating resistor formed on a substrate, an electrode for energizing the heating resistor, and a protection film for covering the heating resistor and the electrode;
- wherein the protection film has a surface with a ten-point mean roughness of no smaller than 0.2 μm;
- wherein the protection film comprises a first layer formed on the heating resistor and the electrode, and a second layer formed on the first layer;
- and
- wherein the second layer is porous, and the first layer is non-porous.
2 more elements
Dependencies are inferred from the claim text.