Rohm Co., Ltd.

Tadashi Yamamoto

Masatoshi Nakanishi

Yoichi Aoki

Koji Nishi

Yasuhiro Yoshikawa

Shinobu Obata

Satoshi Kimoto

Akira Fujita

Toshihiro Kimura

Kazuya Nakakubo

Kanjou Ishibashi

A thermal print head includes: a substrate having an obverse surface; a plurality of heat generators arranged on the substrate in a main scanning direction; and a wiring layer provided on the substrate and constituting an energization path to the heat generators. The substrate has a protrusion protruding from the obverse surface and extending in the main scanning direction. The protrusion has a top portion having the largest distance from the obverse surface, and an inclined portion connected to the top portion in a sub-scanning direction. The inclined portion is inclined relative to the obverse surface at a predetermined angle. Each of the plurality of heat generators extends across a boundary between the top portion and the inclined portion. Each of the heat generators is formed on at least a part of the top portion and at least a part of the inclined portion in the sub-scanning direction.

Thermal print head

A thermal printhead includes a substrate, a resistor layer with heat generation portions supported by the substrate and aligned in a primary scanning direction, a wiring layer supported by the substrate to form a conductive path to the heat generation portions, an insulating layer interposed between the substrate and the resistor layer, and a reflection layer located opposite to the heat generation portions with respect to the insulating layer. The reflection layer overlaps with the heat generation portions as viewed in a thickness direction of the heat generation portions and has a greater heat reflectivity than the insulating layer.

Thermal printhead

The present invention provides a thermal print head and a thermal printer that can deliver improved printing quality. The thermal print head includes a main substrate with a main surface, heating elements arranged along a main scanning direction, and a protection layer that covers the heating elements. A belt-shaped heating glaze layer is between the main surface and the heating elements, extends along the main scanning direction, and bulges towards the direction where the main surface faces. The surface shape of the protection layer has an equivalent radius of curvature Re between 6200 &#x3bc;m and 15000 &#x3bc;m. The equivalent radius of curvature Re is calculated by Hq and Wq. Hq is &#xbc; of the maximum height Hm of the bulging portion of the protection layer including the heating glaze layer. Wq is the width of the bulging portion along a sub-scanning direction, measured at a height equal to Hm minus Hq.

Thermal print head and thermal printer

A thermal printhead (A) comprises an insulating substrate (), a common electrode () which is formed on the insulating substrate () and includes a plurality of comb teeth (), a plurality of individual electrodes () formed on the insulating substrate (), and a resistor layer () formed on the insulating substrate () and electrically connected to the comb teeth () and the individual electrodes (). The resistor layer () comprises a thin film, whereas the common electrode () and the individual electrodes () comprise a thick film.

Thermal printhead with a resistor layer and method for manufacturing same

Growing community of inventors

Kyoto, Japan

Tadashi Yamamoto