Murata Manufacturing Co., Ltd.

Murata Mfg. Co., Ltd.

Kiyofumi Torii

Takashi Shikama

Yuichi Takaoka

Asami Wakabayashi

Toshikazu Nakamura

Yutaka Ikeda

Takayo Katsuki

Minoru Shimada

Hiroshi Ohta

Shinji Omura

Tomoyuki Yamamoto

Osamu Watanabe

Akira Toba

Kouichi Tatsuoka

Masaru Nakagawa

Masahiro Yokota

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

A demagnetizing circuit has a positive characteristic thermistor and a demagnetizing coil connected in series with an alternating current power supply and is so constructed that it is possible to suppress the production of a low-frequency electromagnetic field. After the completion of a demagnetizing operation, the demagnetizing coil and the alternating current power supply can be completely isolated from each other, i.e. both ends of the demagnetizing coil can be electrically cut off from the alternating current power supply, so that it is impossible for residual demagnetizing current from the alternating current power supply to produce a low-frequency electromagnetic field in the demagnetizing coil. Also, preferably, at least one end of the demagnetizing coil is kept at a reference potential by way of a capacitor to dissipate any currents which may be induced in the demagnetizing coil by any influence other than the alternating current power supply.

Demagnetizing circuit

In a heating apparatus including a plate-shaped positive temperature coefficient thermistor having a pair of electrode films, a pair of terminal plates of an elastic metal material are provided on the pair of electrode films of the thermistor, and there is further provided a spacer including a mounting through-hole which passes through the spacer in a thickness direction thereof. The spacer receives the thermistor in the mounting through-hole so as to position the thermistor therein between the pair of terminal plates. Each terminal plate comprises at least one extending portion extending in a longitudinal direction thereof from one portion of one end thereof, and the extending portion comprises a stopper piece which is folded toward the spacer, the stopper piece including a hook-shaped engaging stopper at an end of the stopper piece. Furthermore, the spacer comprises an engaging through-hole formed at a position corresponding to the engaging stopper of the stopper piece of each of the pair of terminal plates and the engaging through-hole passes through the spacer in the thickness direction thereof. The pair of terminal plates are elastically urged toward the pair of electrode films of the thermistor, and each engaging stopper is inserted into a corresponding engaging through-hole so as to engage in the spacer.

Heating apparatus comprising a plate-shaped PTC thermistor accommodated

A positive temperature coefficient thermistor device for use in a heating apparatus includes a board-type positive temperature coefficient thermistor element and a first and a second radiator for radiation disposed adjacent a front and a rear surface of the thermistor element, respectively. Each of the first and second radiators has a pair of fitting flanges which are respectively arranged on a pair of opposed sides of each radiator. Such fitting flanges are oriented with their longitudinal ends at right angles to a flow direction of air to be heated by the positive temperature coefficient thermistor device. Corresponding fitting flanges of the first and second radiators are engaged with each other by a pair of pin members which are inserted between respective pairs of opposing surfaces of the facing flanges to hold the flanges in a fixed relation to each other. The thermistor element is contained in a space surrounded by the first and second radiators.

Positive temperature coefficient thermistor device for a heating

A PTC thermistor device includes a heat generator containing a PTC thermistor unit, and heat radiators thermally coupled thereto. Each of heat radiators includes a plate, one main surface of which is adhered onto the heat generator, and a number of fins integrally formed on the other main surface of the plate. Since the plates of the heat radiators are thermally coupled to the heat generator, respectively, heat generated by the PTC thermistor unit is radiated from the fins through the plates. Free ends of respective sets of fins form opening portions, and guide plates are disposed above and below the respective opening portions so as to prevent air from escaping through the opening portions. If the guide plates are movable guide plates and are moved, an opening degree of each opening portion covered by each of the movable guide plates is changed such that temperature of warm air blown-out from an air outlet side can be adjusted or controlled.

PIC thermistor device having heat radiation fins with adjustable

A method of assembling a cylindrical heater whereby the cylindrical heater includes a positive temperature coefficient thermistor element sandwiched between a pair of terminal members at its opposite electrode surfaces. The thermistor element is inserted into an opening formed in a cylindrical case of a material having heat-shrinkability and thereafter, the cylindrical case is caused to shrink by heating for holding the positive temperature coefficient thermistor element and the terminal members under pressure so as to obtain thermal connection thereof.

Method of assembling cylindrical heater

A self-regulating electric heater includes a casing made of ceramic and a heating unit housed in the casing. The heating unit includes a PTC body for generating heat when electric current is supplied, heat dissipating plates essentially made of brass and coupled to the PTC body in such a manner as to sandwich the PTC body between the heat dissipating plates and terminals connected to each of the heat dissipating plates for the external electrical connection. The self-regulating electric heater further includes lid member and sealing member for sealing the casing hermetically.

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Ohmihachiman, Japan

Kiyofumi Torii