Murata Manufacturing Co., Ltd.

Takayo Katsuki

Takashi Shikama

Yuichi Takaoka

Tomoaki Tadokoro

Katsuyuki Uchida

Yutaka Ikeda

Minoru Shimada

Kiyofumi Torii

Yoshiaki Abe

Asami Wakabayashi

Haruo Takahata

Takeo Haga

Shinji Omura

Hiroshi Ohta

Hisao Enomoto

Shyoji Asida

Osamu Watanabe

Akira Toba

Masanori Nishibori

Kouichi Tatsuoka

Masaru Nakagawa

Masahiro Yokota

A chip-type semiconductor ceramic electronic component including a ceramic body made of a semiconductor ceramic, first external electrodes formed on opposite end surfaces of the ceramic body, and second external electrodes extending to cover surfaces of the first external electrodes and part of side surfaces of the ceramic body. A curvature radius of a corner portion of the ceramic body is R (&#x3bc;m), a maximum thickness of a layer of the first external electrode layer, which is in contact with the ceramic body, measured from the end surface of the ceramic body is y (&#x3bc;m), and a minimum thickness of a layer of the second external electrode, which is in contact with the side surface of the ceramic body, measured from an apex of the corner portion of the ceramic body is x (&#x3bc;m), and 20&#x2266;R&#x2266;50, &#x2212;0.4 x+0.6&#x2266;y&#x2266;0.4 is satisfied when 0.5&#x2266;x&#x2266;1.1, and &#x2212;0.0076 x+0.16836&#x2266;y&#x2266;0.4 is satisfied when 1.1&#x2266;x&#x2266;9.0.

Chip-type semiconductor ceramic electronic component

A surface-mountable PTC thermistor element includes electrodes disposed on a top surface and a bottom surface of a thermistor element body, in which each of the electrodes is connected with a terminal respectively and each of the terminals is extended downward. An upper terminal is protected from being detached by a reaction force acting against pressing at the time of press-mounting the PTC thermistor element onto a surface of a substrate. A vertical-leg portion of the lower terminal is placed inside the thermistor element body in the radial direction from the outer edge of the thermistor element body. Preferably, the vertical-leg portion of the lower terminal is placed in the vicinity of the center of the thermistor element body.

Surface-mountable PTC thermistor and mounting method thereof

A surface-mount positive coefficient thermistor includes a plate-like positive coefficient thermistor element, a pair of electrodes on the respective two main surfaces of the positive coefficient thermistor element, a pair of metal terminals each having a cutout at one end region connected to the corresponding electrode, the metal terminals including a metal having a low thermal conductivity, and solders each connecting the end region of the corresponding metal terminal to the outermost layer of the corresponding electrode. The metal terminal is readily and uniformly soldered to the electrode in a short period of time.

Surface-mount positive coefficient thermistor and method for making the same

A temperature sensing device for use in a secondary battery pack includes an NTC element and a current limiter element. The NTC element is disposed at a predetermined position to sense the temperature of a secondary battery incorporated in the secondary battery pack, and one end thereof is electrically connected to a temperature sensing terminal. The current limiter element is connected between the other end of the NTC element and a reference potential terminal.

Temperature sensing device for use in secondary battery pack, and secondary battery pack incorporating the same

A positive-characteristics thermistor apparatus has an insulating case, positive-characteristics thermistor devices, planar terminals, and spring terminals. Whichever thermistor device has a lower resistance of the two thermistor devices is trimmed to have a higher resistance which is near the resistance of the other thermistor device such that the two thermistor devices have substantially the same resistance (for example, within a difference of &plusmn;1 &OHgr;). In other words, a part of an electrode of the thermistor device having a lower resistance is removed with a laser beam.

Thermistor apparatus and manufacturing method thereof

A thermistor for surface mounting includes a first conductive terminal member, a case having a top opening, a planar thermistor element having electrodes on mutually opposite main surfaces thereof, and a second conductive terminal member having at one end thereof a planar cover part which is attached to the top part of the case. One end of the first terminal member is positioned inside the case and above its bottom member. The other ends of the first and second terminal members are positioned on the bottom surface of the case.

Electronic apparatus and surface mounting devices therefor

In one example of a demagnetization (degaussing) circuit, main electrodes of a TRIAC, a first positive temperature characteristic thermistor and a demagnetization coil are connected in series to both ends of an AC supply, and a heat-sensitive switch and a heating resistor are connected in series between an end of the TRIAC on the side of the AC supply and an end of the demagnetization coil on the side of the AC supply. A connecting point between the heat-sensitive switch and the heating resistor is connected to a gate electrode of the TRIAC, and the heat-sensitive switch and the heating resistor are thermally coupled to each other. The disclosed demagnetization circuit does not need a secondary electric circuit such as a relay control circuit and allows easy substrate design, with a small number of components and at low cost. Furthermore, a demagnetization current sufficiently damps to the level causing no color misregistration and color unevenness on a screen of a color television receiver, from the time the color television receiver is powered on until the time a picture appears on the screen.

Demagnetization circuit

A positive-characteristics thermistor apparatus has an insulating case, positive-characteristics thermistor devices, planar terminals, and spring terminals. Whichever thermistor device has a lower resistance of the two thermistor devices is trimmed to have a higher resistance which is near the resistance of the other thermistor device such that the two thermistor devices have substantially the same resistance (for example, within a difference of .+-.1.OMEGA.). In other words, a part of an electrode of the thermistor device having a lower resistance is removed with a laser beam.

Disclosed herein is a cup vendor delivery nozzle comprising a nozzle body of resin etc. having a substantially cylindrical shape, a PTC element for heating an inner surface of the nozzle body, and a metal body for transferring heat from the PTC element to the interior of the nozzle body.

Cup vendor delivery nozzle

A PTC thermistor including ceramic body having a positive temperature coefficient of resistivity, a pair of electrode layers provided on both major surfaces of the ceramic body so as to be opposed to each other with the ceramic body interposed therebetween, a ceramic reinforcing plate provided on at least one of the major surfaces of the ceramic body, and an output electrode having a connecting portion for making electrical connection with the electrode layer on an inner major surface of the ceramic reinforcing plate and extending to an outer major surface of the reinforcing plate from the connecting portion.

PTC thermistor

A PTC thermistor has its substrate entirely coated with an insulating glass material except for the area where a silver electrode is formed. Such a thermistor may be produced by coating a substrate with an insulating glass material, forming a silver layer on the coated substrate and fusing the silver layer with a part of the glass material so as to form an electrode adhering to the substrate. An underelectrode may be provided between the substrate and such an electrode. A resistor is formed by encasing such a PTC thermistor with a pair of spring terminals for supporting the thermistor therebetween.

PTC thermistor and PTC thermistor producing method, and resistor with a

There is disclosed an electronic device comprising a plate-shaped electronic element having electrode films. The electronic element is elastically supported by spring members in an electrically insulating case so as to be respectively in contact with the electrode films. Each spring member includes supporting plates opposing to the electrode films and spring pieces for being respectively in contact with the electrode films at contact points thereof. Each spring piece is formed integrally with the supporting plate so as to be extended with a curvature toward the electrode film from one end of the supporting plate in the longitudinal direction thereof to the contact point, to be folded by a predetermined angle at the contact point, and to be further extended toward the supporting plate from the contact point without contact with the supporting plate. Further, each spring piece has a predetermined thickness and a predetermined width so as to be cut when a current flowing in the spring pieces through the electronic element becomes larger than a predetermined threshold current in an abnormal state of the electronic element.

Growing community of inventors

Omihachiman, Japan

Takayo Katsuki