Murata Manufacturing Co., Ltd.

Junichi Hamatani

Hisato Oshima

Iwao Fukutani

Kenichi Saito

Takashi Shikama

Takeshi Shikama

Satoshi Tsuruhara

An inductor is constructed to achieve efficient formation of external electrodes, and exhibits high reliability of connection between the external electrodes and an internal conductor, and desired characteristics. In the method of manufacturing the inductor, a magnetic material formed by kneading a magnetic material and a resin is molded to form a magnetic material compact body in which the internal conductor is partially exposed from the external surface thereof, and then the surface of the magnetic material compact body is plated to form the external electrodes including a plated metal film and connected to the internal conductor. The surface of the magnetic material compact body is roughened, and then the external electrodes are formed via plating.

Inductor and method of producing the same

A method for manufacturing an inductor is performed in such a manner that the surface of a metal wire provided with an insulating film thereon is coated with a thermal melting resin. The thickness of the thermal melting resin is, for example, approximately 1 &#x3bc;m. As the thermal melting resin, a thermoplastic resin or a thermosetting resin, such as a polyimide resin or an epoxy resin, containing 85 wt % of a powdered ferrite is used. This coated metal wire is densely wound to form a solenoid-type coil conductor. Next, the thermal melting resin is softened by a heat treatment at, for example, 180&#xb0; C. and is then solidified by spontaneous cooling. Accordingly, the portions of the coil conductor adjacent to each other are bonded together by the thermal melting resin.

Method for manufacturing an inductor

An electronic device containing an electronic element such as a thermistor element is produced first by providing the element with electrodes formed on its two main surfaces facing outward away from each other, at least two terminals and a casing. Each terminal has a contact part for contacting one of the electrodes and an extended part extending from the contact part. The contact part of at least one of the terminals is elastic and bendable. The terminals and the electronic element are inserted into the casing either sequentially or simultaneously as an assembly in any of the ways such that the electrodes on the electronic element are not rubbed directly against the contact parts of the terminals. This may be done by disposing flexible guide plates over the contact parts such that the electrodes will glide over these guide plates as the electronic element is inserted after the terminals are installed inside the casing. Alternatively, the contact parts may be contacted to the electrodes to form an assembly outside the casing which is made divisible into tow parts, and the assembly is placed into one of the divided parts and the two parts of the casing are joined together.

Method of making an electronic device

A method of manufacturing an inductor includes the step of molding a magnetic material formed by kneading a magnetic material and a resin to form a magnetic material compact body in which the internal conductor is partially exposed from the external surface thereof. Then the surface of the magnetic material compact body is plated to form the external electrodes including a plated metal film and connected to the internal conductor. The surface of the magnetic material compact body is roughened, and then the external electrodes are formed via plating.

Method of manufacturing an inductor

A inductor is constructed such that at least about two-thirds of a final winding of wire at each end of an internal conductor-coil embedded in a molded magnetic body project from end surfaces of the molded magnetic body by at least about one-fifth of the diameter of the wire. External electrodes are connected with respective portions of the internal conductor-coil, which are exposed at the respective end surfaces of the molded magnetic body.

Inductor and method for manufacturing same

An electronic component includes an internal conductor (conductor coil) made of a metal that is embedded in a molded body. The molded body is formed by molding a ferrite resin into a fixed shape, such that at least a portion of the internal conductor is exposed on the surface of the molded body, and external electrodes, which are connected to the internal conductor, are provided in a fixed area, including the exposed portion of the internal conductor, on the surface of the molded body. The electronic component is manufactured by depositing palladium at a density of about 0.5 &mgr;g/cm to about 1.5 &mgr;g/cm in the area in which the internal conductor is not exposed on the molded body, and at a density of about 0.05 &mgr;g/cm to about 0.3 &mgr;g/cm on the internal conductor exposed on the surface of the molded body. The external electrodes are formed via a process of forming a metal film (electroless plating film) on the surface of the molded body by conducting electroless plating.

Electronic component and method of manufacturing same

A method for efficiently and economically manufacturing an inductor using a resin based magnetic material, and a highly reliable inductor that is manufactured by the method, produces a unique inductor including a molded magnetic material member. An inner conductor is disposed in the molded magnetic material member and is exposed at a surface of the molded magnetic material member. The molded magnetic material member is formed using the resin based magnetic material in which a component that functions as nuclei for applying electroless plating is blended, followed by forming a selectively coated molded body so that the area not provided with external electrodes on the surface of the molded magnetic material member is covered with an insulating resin and applying electroless plating on the molded magnetic material member (selectively coated molded body), thereby eliminating use of a resist agent that is required in the conventional manufacturing method, as well as a resist agent removing step with an alkali and solvent and a removing step of the electroless plating film with an acid, by forming the electroless plating film as the external electrodes on the desired area.

Inductor and manufacturing method thereof

A device for automatically shutting off a current is used in combination with a motor start-up component incorporated in a motor-driving circuit including an auxiliary coil which operates at a start-up time of a motor and a main coil for its steady-state operation. This motor start-up component includes a motor start-up thermistor with positive temperature characteristic having a first electrode and a second electrode, a first connector member having a first male terminal part and connected to the first electrode and a second connector member having a second male terminal part and connected to the second electrode. The motor start-up thermistor is connected in series to the auxiliary coil through the first electrode. The current-shutting device includes first and second terminal members each having a female terminal part for receiving a corresponding one the male terminal parts, a triac having a first triac terminal, a second triac terminal and a gate terminal, a triac-controlling thermistor with positive temperature characteristic and a case which encloses at least the triac and the triac-controlling thermistor.

Device for shutting off current through a motor start-up circuit after a

A motor start-up circuit is incorporated in a motor-driving circuit provided with an auxiliary coil which operates during a start-up time of the motor and a main coil for a steady-state operation of the motor. The start-up circuit in one form has a start-up thermistor with positive temperature characteristic and a Triac switch connected in series with the auxiliary coil and a triac-controlling thermistor with positive temperature characteristic connected in parallel to the start-up thermistor, and one of the terminals of the triac-controlling thermistor is connected to the gate of the Triac switch. The start-up circuit in another form has a Triac switch connected in series with the auxiliary coil and a triac-controlling thermistor with positive temperature characteristic connected in parallel to the auxiliary coil and the Triac switch and one of the terminals of the triac-controlling thermistor is connected to the gate of the Triac switch. In both forms, the triac-controlling thermistor has resistance 300-3000 .OMEGA. at 25.degree. C. and volume of 30-60 mm.sup.3 and doubles its value of resistance at 25.degree. C. at 70-125.degree. C.

Motor start-up circuit with a triac and PTC thermistors

A motor-driving circuit includes an auxiliary coil which functions at the time of the start-up of the motor and a main coil for its stead state operation. A component of a start-up circuit to be incorporated in such a motor-driving circuit includes a thermistor with positive temperature characteristic and a Triac switch which are to be connected in series with the auxiliary coil, a case which contains both the thermistor and the Triac switch, and a connector member having a planar contact portion, one of its principal surfaces contacting an electrode of the thermistor and the other of the principal surfaces contacting the inner wall surface of the case. The case may further contain therein another thermistor connected to the gate of the Triac switch for controlling the Triac switch.

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Shiga-ken, Japan

Junichi Hamatani