Rohm Co., Ltd.

Toshiyuki Fujita

Yusaku Kawabata

Toshio Watanabe

Toshihiko Takakura

Teruhisa Sako

Hiroaki Ohnishi

A lighting device includes a substrate having a side extending straight in a first direction and a first LED chip supported by the substrate and having a first anode terminal and a first cathode terminal. The lighting device includes a second LED chip and a third LED chip supported by the substrate, being electrically connected to the second cathode terminal, and being overlapped with the first LED chip when viewed in a second direction that is perpendicular to the first direction. The lighting device includes a connecting portion that connects the first cathode terminal and the second anode terminal with each other, at least a portion of the connecting portion angled at an acute angle with respect to the second direction.

Lighting device

A lighting device includes a substrate and a planar light source portion including a plurality of LED chips arrayed on the substrate. The planar light source portion faces an illumination space (space to be illuminated) by a predetermined opening area. The plurality of LED chips are arrayed on the substrate such that the mounting density with respect to the opening area is not less than 3/cm, and accordingly, a planar light source is formed.

A thermal printhead includes a substrate, an electrode layer formed on the substrate, and a heating resistor which is formed on the electrode layer and contains a conductive substance and glass. The conductive substance of the heating resistor is doped in advance with an insulating substance which is identical in crystalline structure to the conductive substance. The heating resistor is formed by mixing powder of the insulating substance, which is identical in crystalline structure to the conductive substance, with the conductive substance powder, baking the obtained mixture, pulverizing the baked mixture, mixing the pulverized mixture with glass powder to prepare a resistor paste, and printing and baking the obtained resistor paste.

Thermal printhead, heating resistor used for the same, and process of making heating resistor

A method of making thermal printheads is provided which comprises the steps of: (a) preparing a master substrate having plural rows of unit head regions; (b) forming a head glaze member in each unit head region in each row so that an edge of the head glaze member of the unit head region aligned with that of the head glaze member of any other unit region in the same row; (c) half-cutting the master substrate along the edge of the head glaze member of the unit head region with a half-cutting dicing blade which has an inclined edge face for partially cutting the head glaze member to provide a glaze corner; and (d) forming an array of heating dots along the glaze corner; wherein at least one blade positioning mark is formed on the master substrate before the half-cutting step (c); and the half-cutting dicing blade is positionally set in the half-cutting step (c) by referring to the blade positioning mark.

Growing community of inventors

Kyoto, Japan

Toshiyuki Fujita