Murata Manufacturing Co., Ltd.

Takashi Kobayashi

Motoi Nishii

Hiroyuki Takeuchi

Minoru Tamada

Toshikazu Nakamura

Takashi Shikama

Katsuhisa Imada

Yoshihiro Nishinaga

Eiichi Maeda

Tomoyuki Yamamoto

Atsuo Yokota

Yoshifumi Yamanaka

An insulating ceramic composition which comprises about 62-75 wt % of silicon oxide (in terms of SiO.sub.2), about 4-22 wt % of barium oxide (in terms of BaCO.sub.3), about 0.5-2.5 wt % of aluminum oxide (in terms Al.sub.2 O.sub.3), 0 to about 0.8 wt % of chromium oxide (in terms of Cr.sub.2 O.sub.3), about 0.2-0.8 wt % of calcium oxide (in terms of CaCO.sub.3), about 8-18 wt % of boron oxide (in terms of B.sub.2 O.sub.3), and 0 to about 2.5 wt % of potassium oxide (in terms of K.sub.2 O). A ceramic inductor is made of said insulating ceramic composition.

Insulating ceramic composition and ceramic inductor using the same

A lamination type inductor having a ferrite layer having opposite main surfaces each with a periphery including opposite ends having end edges thereat, the ferrite layer further having end edges at the opposite ends of the main surfaces and a through hole therein along the periphery, the ferrite layer having a conductor pattern on each main surafce thereof, the conductor pattern on one main surface having a first end portion along one end of the one main surface and extending 0.75 turn from about the middle of the first end portion along the periphery of the one main surface of the ferrite layer to the through hole, and the conductor pattern on the other main surface having a second end portion along the other end of the other main surface and extending 0.75 turn from about the middle of the second end portion along the periphery of the other main surface of the ferrite layer to the through hole, the conductor patterns being electrically connected through the through hole for forming a substantially 1.5-turn coil; outside ferrite layers laminated onto the opposite main surfaces of ferrite layer and having outside end portions corresponding to the opposite ends of said ferrite layer; and outside electrodes on the outside of the laminated body at the respective outside end portions of the outside ferrite layers and the end edges of the ferrite layer and electrically connected with the first and second end portions.

Lamination type inductor

A lamination type inductor has a plurality of ferrite sheets assembled one above the other and laminated together, the uppermost and lowermost sheets being end sheets having lead-out conductor patterns thereon and conductor patterns on the surfaces of the end sheets which face each other which are connected to the lead-out conductor patterns and which are for connection to conductor patterns on intermediate sheets, and a plurality of intermediate ferrite sheets, each having a conductor pattern on one surface thereof which corresponds to a 0.25 turn of an inductor coil and a conductor pattern on the other surface which corresponds to a 0.5 turn of an inductor coil, each ferrite sheet having an opening therethrough through which the conductor patterns of the 0.25 and 0.5 turn are electrically connected to form a 0.75 turn of an inductor coil on each ferrite sheet. The conductor patterns on the successive intermediate sheets are connected to each other for forming an inductor coil having a number of turns which is a multiple of 0.75, and the conductor patterns on the upper surface of the uppermost of the plurality of intermediate ferrite sheets and the lower surface of the lowermost of the intermediate ferrite sheets are electrically connected to the conductor patterns on the surfaces of the end sheets which face each other for forming with the lastmentioned conductor pattern a complete inductor coil.

A semiconductor ceramic composition of a barium titanate system comprises a main component containing a minor quantity of one or more semiconductor-forming elements, and additives of manganese oxides and silica incorporated therein, and is characterized by that the main component consists essentially of 30 to 95 mol % of BaTiO.sub.3, 3 to 25 mol % of CaTiO.sub.3, 1 to 30 mol % of SrTiO.sub.3 and 1 to 50 mol % of PbTiO.sub.3. The contents of manganese oxides and silica are 0.03 to 0.15 mol %, preferably, 0.03 to 0.10 mol % in terms of Mn, and 0.5 to 5 mol % in terms of SiO.sub.2, respectively, with respect to one mole of the main component. One or more semiconductor-forming elements are selected from the group consisting of rare earth elements, Nb, Bi, Sb, W and Th, and the content of the elements is 0.2 to 1.0 mol %.

Semiconductor ceramic composition

A combination starter-protector device for a winding circuit of a dynamoelectric motor comprises a housing structure having a perforated wall dividing the interior of the housing structure into starter and protector compartments. The starter compartment accommodates therein a positive temperature coefficient thermistor while the protector compartment accommodates therein a bimetal switch. The housing structure has two sets of terminals, one set of the terminals being adapted to be connected to the winding circuit of the motor whereas the other set of the terminals are adapted to be connected to a power source. The distance between the thermistor and the bimetal switch may be adjustable by the employment of a spacer element.

Combination starter-protector device

The present disclosure relates to a heating unit for heating fluid such as air, in which a plurality of positive temperature coefficient (PTC) semiconductors are aligned in parallel to define clearances between each PTC semiconductor for the passage of the fluid. Each PTC semiconductor is provided with two electrodes disposed on the surface thereof for rapidly generating heat therefrom.

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Nagaokakyo, Japan

Takashi Kobayashi