Thermal head, method of manufacturing the same, and thermal printer
AssigneeKYOCERA Corporation
InventorYoshihiro Inokuma
Life of this patent
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Abstract
A thermal head in which battery effect-induced corrosion can be retarded while maintaining excellent anti-static capability in an upper conductive protective film, is provided. The thermal head includes a substrate, a heater element arranged on the surface of the substrate, an electrode layer connected to the heater element, and an upper conductive protective film for covering part of the electrode layer. In the thermal head, between the electrode layer and the upper conductive protective film is interposed a lower conductive protective film which is higher in specific resistance than the upper conductive protective film.
Claims18
A thermal head comprising:
- a substrate;
- a heater element arranged on a surface of the substrate;
- an electrode layer connected to the heater element;
- and
- a protective film for covering the heater element and the electrode layer, which makes contact with the electrode layer,
- wherein the protective film comprises an insulating protective film laminated on the heater element and part of the electrode layer, a lower conductive protective film directly laminated on the electrode layer and the insulating protective film, and an upper conductive protective film laminated on the lower conductive protective film, and
- wherein the upper conductive protective film is lower in specific resistance than the lower conductive protective film.
A thermal head comprising:
- a substrate;
- a heater element arranged on a surface of the substrate;
- an electrode layer connected to the heater element;
- and
- a protective film for covering the heater element and the electrode Layer, which makes contact with the electrode layer,
- wherein the protective film comprises an insulating protective film laminated on the heater element and part of the electrode layer, and a conductive protective film directly laminated on the electrode layer and the insulating protective film, and
- wherein the conductive protective film is so designed that its specific resistance becomes lower gradually from an electrode layer-side part to an outer surface-side part thereof in a thickness direction.
Dependencies are inferred from the claim text.