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.
Claims24
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 conductive protective film for covering the heater element and the electrode layer, which makes direct contact with the electrode layer,
- wherein the conductive protective film comprises a lower conductive protective film laminated on the electrode layer and an upper conductive protective film laminated on the lower conductive protective film, the upper conductive protective film being 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 conductive protective film for covering the heater element and the electrode layer, which makes direct contact with the electrode layer,
- 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.
A method of manufacturing a thermal head, comprising:
- a first step of forming, on a surface of a substrate, a heater element and an electrode layer which is connected to the heater element;
- a second step of laminating a lower conductive protective film on the electrode layer so as to cover the heater element and the electrode layer;
- a third step of laminating, on the lower conductive protective film, an upper conductive protective film having a specific resistance which is lower than that of the lower conductive protective film;
- and
- a fourth step of immersing the entire substrate having the lower conductive protective film and the upper conductive protective film formed thereon in a cleaning solution.
A method of manufacturing a thermal head, comprising:
- a first step of forming, on a surface of a substrate, a heater element and an electrode layer which is connected to the heater element;
- a second step of laminating a conductive protective film on the electrode layer so as to cover the heater element and the electrode layer, as well as of adjusting a carbon content of the conductive protective film in such a way that it becomes higher gradually from an electrode-layer side part to an outer-surface side part of the conductive protective film ;
- and
- a third step of immersing the entire substrate having the conductive protective film formed thereon in a cleaning solution.
Dependencies are inferred from the claim text.