A liquid discharge head includes a recording element substrate. The recording element substrate includes a discharge aperture forming member defining a discharge aperture from which a liquid is discharged and a substrate having a pressure generating element that pressurizes the liquid so as to discharge the liquid. The liquid discharge head also includes a cover member that defines an opening through which the discharge aperture is exposed. The cover member is disposed on a side of the recording element substrate on which the discharge aperture is formed. In the liquid discharge head, the recording element substrate further includes an electrode disposed on a side of the substrate on which the discharge aperture forming member is formed and an insulation member that covers the electrode. In addition, the insulation member is covered by the cover member.

The present invention provides a method for manufacturing thermal print heads. By forming a molybdenum antioxidation layer on the electrode pattern layer, the oxidation or erosion phenomena on the electrode pattern layer (formed by aluminum or aluminum-copper alloy) in the manufacturing process can be prevented, and hence improving the reliability and lifetime of thermal print heads.

An electronic device includes a switching element, a first common-electrode wiring, at least a part of the first common-electrode wiring being covered with the switching element, a plurality of second common-electrode wirings branched from the part of the first common-electrode wiring covered with the switching element, a plurality of individual power-output terminals arranged in a row in the switching element, and a plurality of individual-electrode wirings arranged in a row, the plurality of individual-electrode wirings being connected to the plurality of individual power-output terminals, respectively. Each of the plurality of second common-electrode wirings is disposed between the plurality of individual-electrode wirings.

A thermal head includes: an underglaze layer provided on an insulating substrate; an electrode provided on the underglaze layer; a heat generator provided on the electrode; a first protective layer containing a glass material and covering at least the heat generator; and a second protective layer provided on the first protective layer, having a melting point higher than that of the first protective layer, and made of a material whose thermal expansion coefficient at a temperature of 1000 C. or lower is substantially constant.

An electronic device includes a switching element, a first common-electrode wiring, at least a part of the first common-electrode wiring being covered with the switching element, a plurality of second common-electrode wirings branched from the part of the first common-electrode wiring covered with the switching element, a plurality of individual power-output terminals arranged in a row in the switching element, and a plurality of individual-electrode wirings arranged in a row, the plurality of individual-electrode wirings being connected to the plurality of individual power-output terminals, respectively. Each of the plurality of second common-electrode wirings is disposed between the plurality of individual-electrode wirings.

A thermal print head element includes a substrate, a glaze layer, a heat accumulating layer, a heat generating resistor layer, an electrode layer and an insulating protective layer. The glaze layer is disposed on the substrate to form a ridge portion that linearly extends. The heat accumulating layer covers the ridge portion and the substrate, and is formed with an opening portion that exposes a part of the substrate. The heat generating resistor layer covers the heat accumulating layer. The electrode layer covers the heat generating resistor layer to directly contact with the part of the substrate through the opening portion. The insulating protective layer covers the electrode layer and the heat generating resistor layer, and formed with a through hole so that a soldering region of the electrode layer is exposed outwards from the insulating protective layer through the through hole.

The present invention provides a thermal print head capable of better performing printing on a printing medium.

The thermal print head includes: a substrate (1), formed with single crystal semiconductor; a resistor layer (4), including a plurality of heating portions (41) arranged in a main scan direction; and a wiring layer (3), configuring a charging path to the plurality of heating portions. The substrate includes: a main surface (11), being a surface opposite to the resistor layer; and a convex portion (13), disposed as protruding from the main surface and extending in the main scan direction. The convex portion includes: an inclining surface (132), inclining relative to the main surface and extending in a linear manner when viewing from the main scan direction; and a curving surface (131), disposed, in a protruding direction of the convex portion, on a position farther away from the main surface than the inclining surface, and curving in a manner that protrudes toward the protruding direction. Each of the plurality of heating portions includes a heating curving portion (411) formed on a portion corresponding to the curving surface.

A manufacturing method of a thermal head structure capable of improving printing resolution includes the following steps. A heat storing layer, a first electrode pattern, a heat generating resistor layer, a second electrode pattern and an insulating protective layer are formed to be overlapped on a substrate, and the step of forming the heat generating resistor layer is between the step of forming the first electrode pattern and the step of forming the second electrode pattern chronologically.

A thermal head X1 according to the present disclosure includes a substrate, a heat generator, an electrode, and a protective layer. The heat generator is positioned on the substrate. The electrode is positioned on the substrate and connected to the heat generator. The protective layer covers the heat generator and part of the electrode. The protective layer contains titanium and nitrogen. The protective layer satisfies P2>P1 where P1 is the peak intensity of X-ray diffraction of the (111) plane, and P2 is the peak intensity of X-ray diffraction of the (200) plane.

A thermal printhead includes a substrate having an obverse surface, a projection formed on the obverse surface and extending in a primary scanning direction, a plurality of heating elements arranged in the primary scanning direction on the top of the projection, a groove dented from the top of the projection and extending in the primary scanning direction, and a heat storage member filling at least an opening of the groove.