Rohm Co., Ltd.

Tomohiko Horikawa

Hideaki Hoki

Tomoharu Horio

Shinobu Obata

Minoru Sakamoto

The object is to provide a thermal print head capable of improving printing quality on a medium. The Solution is to provide a base memberincluding a recess, a heat storage regionformed in the recess, a resistor layerformed on the base member, and an electrode layerformed on the base memberand electrically connected to the resistor layer. The resistor layerincludes a heating portionspanned between two portions of the electrode layerspaced from each other as viewed in a thickness direction Z of the base member. The heating portionis located so as to overlap the recessas viewed in the thickness direction Z. The base memberis made of a material having a thermal conductivity of 100 to 300 W/(m&#xb7;K).

Thermal print head and thermal printer

A thermal printhead includes a substrate, a resistor layer formed on the substrate, an electrode layer formed on the substrate and electrically connected to the resistor layer, and an insulating layer. The electrode layer includes a first electrically conductive portion and a second electrically conductive portion spaced apart from each other. The resistor layer includes a heater portion that bridges the first electrically conductive portion and the second electrically conductive portion as viewed in the thickness direction of the substrate. The insulating layer includes a portion positioned between the electrode layer and the heater portion. This arrangement reduces formation of a eutectic region between the heater portion and the electrode layer.

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Kyoto, Japan

Tomohiko Horikawa