Koa Corporation

Kentaro Matsumoto

Taro Kimura

Kotaro Kashiwagi

A sulfurization detection sensorcomprises: a rectangular parallelepiped insulation substrate, a pair of front electrodesprovided at both ends of a front surface in the longitudinal direction of the insulation substrate, respectively, a sulfurization detection conductorconnected between the front electrodes, a pair of protective filmsfor covering a part of the sulfurization detection conductorand that of the front electrodes, respectively, a pair of back electrodesprovided at both ends of a back surface in the longitudinal direction of the insulation substrate, respectively, a pair of end face electrodesprovided at both ends in the longitudinal direction of the insulation substrate, respectively, and external electrodesprovided on front surfaces of the end face electrodes, respectively. Specific regionsin which a current hardly flows are formed at both ends in the Y-direction of a sulfurization detection portionA.

Sulfurization detection sensor

Provided is a chip resistor including: a rectangular parallelepiped insulating substratewhich is made of ceramics; a pair of front electrodeswhich are provided on lengthwise opposite end portions in a front surface of the insulating substrate; a resistive elementwhich is provided between and connected to the two front electrodes; an insulating protective layerwhich covers the whole of the front surface of the insulating substrateincluding the resistive elementand the two front electrodes; and a pair of cap-shaped end-surface electrodeswhich are provided on the lengthwise opposite end portions of the insulating substrateto be connected to the front electrodes; wherein: the protective layeris formed out of a semi-transparent resin material which is similar in color to the insulating substrate

Chip resistor and method for producing chip resistor

Provided is a chip resistor including: a rectangular parallelepiped insulating substrate which is made of ceramics; a pair of front electrodes which are provided on lengthwise opposite end portions in a front surface of the insulating substrate; a resistive element which is provided between and connected to the two front electrodes; a protective layer which is made of a resin and which entirely covers the front surface of the insulating substrate including the two front electrodes and the resistive element; and a pair of cap-shaped end-surface electrodes which are provided on the lengthwise opposite end portions of the insulating substrate to establish electrical continuity to the front electrodes respectively; wherein: a chip element assembly in which the insulating substrate and the protective layer are laminated on each other but the end-surface electrodes have not been formed yet has an external shape substantially like a square cylinder.

Chip resistor

A chip resistor including an insulating film covering a resistor making contact with a pair of electrodes formed on an upper surface of an insulating substrate and a method for manufacturing same are provided. Both electrodes include a main electrode layer that contains silver as a main metal component an 10 weight % or more of palladium as another metal component, and an auxiliary electrode layer lower in specific resistance than the main electrode layer, a laminate part where the auxiliary electrode layer and the main electrode layer are laminated in order on a single surface of the insulating substrate; and an exposed part of the auxiliary electrode layer where a part of the auxiliary electrode layer is not covered with the main electrode layer on a far side from the resistor, and part that extend from a near side to the far side with respect to the resistor.

Chip resistor and method for manufacturing same

In order to provide a chip resistor which has wide and flat terminal electrodes in its front surface and which has high connection reliability between front electrodes and the terminal electrodes, a chip resistor according to the present invention includes: an insulating substrateshaped like a cuboid; a pair of front electrodesprovided on lengthwise opposite edge portions of a front surface of the insulating substrate; a resistor bodyprovided between the front electrodes; an insulating protection layercovering entire surfaces of the front electrodesand the resistor body; and a pair of terminal electrodesprovided on lengthwise opposite end surfaces of the insulating substrate. The chip resistor is configured such that the front electrodessandwiched between the insulating substrateand the protection layerare exposed from widthwise end surfaces and the lengthwise end surfaces of the insulating substrate, and the terminal electrodeswrap around the widthwise opposite end surfaces of the insulating substrateto be thereby connected to the exposed portions of the front electrodes

The invention is to provide a chip resistor suitable for lowering an initial resistance value. A chip resistoraccording to the present invention is provided with: an insulating substrate; a pair of front electrodeswhich are provided on a front surface of the insulating substrateso as to face each other with a predetermined interval therebetween; a resistive elementwhich is provided so as to bridge the front electrodes; a pair of auxiliary electrodeswhich are provided so as to cover the front electrodesand overlap end portions of the resistive element; and the like. The chip resistoris configured such that: the front electrodesare formed of a material which contains 1 to 5 wt % Pd and the balance Ag; and the auxiliary electrodesare formed of a material which contains 15 to 30 wt % Pd and a metal material (e.g. Au) lower in resistivity than Pd and the balance Ag.

Chip resistor and method for producing same

Provided is a chip resistor having wide and flat end-face electrodes on a surface thereof and having increased connection reliability between upper electrodes and the end-face electrodes. The chip resistor according to the present invention is provided with: a cuboidal insulating substrate; a pair of upper electrodesdisposed at both ends in a longitudinal direction on a surface of the insulating substrate; a resistor bodydisposed between the upper electrodes; an insulating protective layercovering the entire surfaces of the upper electrodesand the resistor body; and a pair of end-face electrodesdisposed on both end faces in the longitudinal direction of the insulating substrate, wherein the upper electrodesinclude bent portionsextending around from between the insulating substrateand the protective layeralong the end faces of the protective layer, and the end-face electrodesare connected to the exposed portions of the upper electrodes, including the bent portions, exposed from between the insulating substrateand the protective layer

To provide a chip resistor in which a resistive element can be surely protected from an external environment and which is also excellent in corrosion resistance, a chip resistoris configured to include an insulating substrate, a pair of front electrodeprovided on opposite end portions of a front surface of the insulating substrate, a pair of back electrodesprovided on opposite end portions of a back surface of the insulating substrate, a resistive elementprovided to extend onto the two front electrodes, a first insulating layercovering the resistive element, a second insulating layermade of a resin material to cover the first insulating layer, end surface electrodesestablishing electrical continuity between the front electrodesand the back electrodes, plating layerscovering the end surface electrodes, etc. Rough surface portionsmade rougher in surface roughness than any other portion of the second insulating layerare formed at opposite end portions of the second insulating layer. End portions of the end surface electrodesand the plating layersare brought into tight contact with the rough surface portionsrespectively.

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Ina, Japan

Kentaro Matsumoto