Abstract: An electromagnetic fuel injection valve includes a needle valve having a sealed bore of a specified length formed therein a guide hole within which the needle valve is movable. A stopper plate and a valve seat portion ar provided for defining opened and closed positions of the needle valve. Further, a magnetic powder of a specified mass is movably received in the bore. When the needle valve collides with the stopper plate or the valve seat portion, the magnetic powder is moved by an inertia force acting. Due to collision of the magnetic powder with an end of the bore with a specified time lag, a bouncing force resulting from the collision of the needle valve can be canceled. Accordingly, a bounce of the needle valve can be restrained. further, since the inertia force acting on the magnetic powder is utilized, the durability can be improved as compared with the prior art.

Abstract: A modular jack to be mounted on a circuit board, the modular jack having contactors which will come into contact with a plug and terminals which will be connected with printed wires on the circuit board. The contactors and the terminals are stamped out of a hoop and fixed in a body case of the modular jack. An end of the contactors and an end of the terminals are arranged nearby, and filter elements for eliminating noise are disposed between the nearby ends.

Abstract: A noise filter of a monolithic type in which a common electrode is formed in a sintered body having varistor characteristics so as to extend from a first portion to a second portion of side surfaces of the sintered body, and at least one through electrode is formed in a position at a height spaced apart from the common electrode through a sintered body layer in the direction of thickness so as to extend from a third portion to a fourth portion of the side surfaces of the sintered body and to intersect the common electrode.

Abstract: A modular jack incorporating a varistor. The varistor reduces noise and surge (abnormal voltage) entering the modular jack, and thereby an electronic appliance such as a telephone connected with the modular jack is not affected by the noise and surge. The varistor is electrically connected between at least a pair of contact leads. Alternatively the varistor is electrically connected between the pair of contact leads and a grounding terminal. Further, the modular jack incorporates a common mode choke coil so as to obtain a common mode noise reduction effect.

Abstract: A signal input device having a mutual inductor formed by a coil connected with a capacitor for a grounding cable in series and a coil connected with a capacitor for a signal cable in series, and a compensating capacitor connected with the series circuit composed of the capacitor and the coil on the grounding cable in parallel. The compensating capacitor serves to prevent occurrence of a voltage on the grounding cable, and accordingly only regular signals received by an antenna are transmitted. The mutual inductor prevents resonance of inductance of a lead terminal of the compensating capacitor with capacitance of the compensating capacitor.

Abstract: A filter connector comprising a housing made of insulating material, an earth plate fitted to the housing, which earth plate has an engaging portion to be engaged with a circuit board, and a signal transmitting pin fitted to the housing, which pin has a filter element electrically connected with the earth plate. The earth plate is connected directly with a ground conductor on the circuit board, and the engaging portion prevents the connector from separating from the circuit board.

Abstract: Disclosed is a modular jack to be mounted on a circuit board, and the modular jack has a printed board containing a noise suppressing electronic element in a housing. The printed board is fitted with contactors for contacting with plugs and terminals to be used for mounting the modular jack on the circuit boad. The contactors and the terminals are electrically connected with the noise suppressing electronic element by wires on the printed board.

Abstract: A retainer for insert-retaining a plurality of pin terminals includes a ferrite member having an aligned arrangement of through holes formed at insertion positions of the pin terminals and a resin member covering one surface of the ferrite member. The resin member also has an aligned arrangement of holes for receiving the pin terminals. The ferrite member functions as a filter element to reduce noise. Thin portions are formed along the inner circumferential surfaces of resin member defining the holes. The thin portions are deformed or fractured by the insertion of the pin terminals, and then each deformed or fractured portion is sandwiched between the inserted pin terminal and the inner circumferential surface to thereby elastically engage the pin terminal, resulting in the retainer being secured to the pin terminals in a manner which prevents the terminals from shifting in position.

Abstract: A filter connector comprising a housing, connector terminals mounted on the housing, filter elements mounted around the connector terminals, and a support plate for supporting the filter elements as being mounted on the housing. The support plate has pairs of elastic flaps which are formed at the positions corresponding to each of the filter elements, the free end of each flap holds the external surface of each filter element to prevent destruction of the filter elements attributable to the difference in the thermal expansion coefficients of materials.

Abstract: A modular jack comprising a built-in common-mode choke coil in which each of two wires of the common-mode choke coil includes its one end comprising a contactor to be put in contact with a counterpart plug and includes the other end comprising a connecting lead to be connected to the printed wiring of a circuit board.

Abstract: A ceramic molded body which can meet strict dimensional tolerances. A ceramic body is sintered, and during this sintering contracts or shrinks to a point that the ceramic sintered body has dimensions smaller (or larger in the case of through-holes) than the final desired dimensions. The ceramaic sintered body is placed in a mold and a resin coating is applied to the exterior of the ceramic sintered body. The dimensions of the resin coating closely match the final desired dimensions.

Abstract: A surface mounting type connector has a connector plug on its front and has a connector housing from which connector pins project at the rear. The connector pin holder is placed at the rear of the connector housing, and has through holes formed therein. Each of these through holes in positioned corresponding to one of the connector pins. On the inner surfaces of the through holes, through-hole conductors are formed. On one or both main planes of the connector pin holder, conductive patterns are connected to each of the through-hole conductors. Each of the tips of the connector pins is inserted into one of the through holes in the connector pin holder, and these tips of the connector pins are connected to the corresponding conductive patterns via the through-hole conductors.

Abstract: A noise suppression inductor including a bobbin having a spool divided into a plurality of spool portions, a core mounted on the bobbin, at least one coil wound around the spool portions into a plurality of coil portions and a plurality of terminal pins connected to opposite ends of the coil, in which the coil portions have different winding widths such that stray capacities produced at the coil portions are made different from each other, whereby the noise suppression inductor has a plurality of self-resonance frequencies.

Abstract: A plurality of inductor elements are arranged side by side in a sintered body obtained by stacking a plurality of ceramic green sheets to cofire the same. Each of the inductor elements comprises at least one line electrode extending in such a direction as to connect first and second side surfaces of the sintered body and outer electrodes electrically connected to both ends of the line electrode. The line electrodes constituting the adjacent inductor elements are formed so as not be positioned in the same plane, that is, in different positions of the heights.

Abstract: A chip-like LC filter which comprises a cylindrical magnetic element having a through hole. A cylindrical capacitor element has a through hole and terminal electrodes formed on inner and outer peripheral surfaces thereof. A central conductor is inserted in the through holes of the magnetic element and the capacitor element, which through holes are aligned along an axial direction. The terminal electrode on the inner peripheral side of the capacitor element is electrically connected with the central conductor. Cap-shaped external terminal members are respectively provided on both end portions of the central conductor, so that the magnetic element and the capacitor element are located between the external terminal members.

Abstract: A surface mountable connector to be mounted on a printed substrate has a plurality of connector pins projecting from the rear surface to be connected with wiring patterns on the printed substrate through a connector pin holder. The connector pin holder has a plurality of through holes at a pitch equal to that of the connector pins and a plurality of conductive patterns on the outside thereof corresponding to the through holes. The connector pins are inserted into the through holes in the connector holder and electrically connected to the conductive patterns corresponding to the through holes respectively, and the connector pin holder is placed on the wiring patterns on the printed substrate with the conductive patterns on the outer surface connected to the wiring patterns on the surface of the printed substrate by soldering, thereby electrically connecting the tip of each connector pin to a corresponding wiring pattern on the surface of the printed substrate.

Abstract: A laminated transformer includes a plurality of ferrite sheets having surfaces on which conductor patterns are formed and are laminated and baked to be a sintered body, and a pair of the primary external electrodes and a pair of the secondary external electrodes are provided at end faces of the sintered body. The transformer is used mainly in a high frequency circuit, the conductor patterns formed at the laminated ferrite sheets being used as the primary or the secondary, both ends of the primary conductor patterns being electrically connected to the pair of the primary external electrodes and both ends of the secondary conductor patterns being electrically connected to the pair of the secondary external electrodes, so that the primary and secondary conductor patterns have no coiled construction and no self-distributed capacity, so that the laminated transformer will no induce self-resonance even when used in a high frequency band.

Abstract: A chip-like LC filter which comprises a cylindrical magnetic element having a through hole, a cylindrical capacitor element having a through hole and terminal electrodes formed on inner and outer peripheral surfaces thereof, and a central conductor inserted in the through holes of the magnetic element and the capacitor element aligned in the axial direction. The terminal electrode on the inner peripheral side of the capacitor element is electrically connected with the central conductor. Flange-shaped external terminal members are respectively provided on both end portions of the central conductor, so that the magnetic element and the capacitor element are located between the external terminal members.

Abstract: A filter connector comprises a connector body which includes a conductive shell and an insulating insert provided in the conductive shell and having a plurality of through holes. First ends of upper first terminal pins are inserted in the through holes of the insert. Second ends of the first terminal pins pass out the back of the connector body. At least one of the plurality of terminal pins is adapted to support a printed circuit board. The printed circuit board has a conductive pattern which is electrically connected with at least one of the upper first terminal pins. A second terminal pin is electrically connected to the conductive pattern, whereby the second terminal pin is electrically connected with at least one of the first terminal pins. A plurality of filter elements are inserted in a current path between at least one of the first terminal pins and the second terminal pin.

Abstract: A filter connector device formed by combination of a male connector and a female connector. When the male connector and the female connector are engaged with each other, male connector pins and female connector pins are connected with each other. A filter circuit is formed by a plurality of elements including at least one capacitor and at least one inductor in cooperation with each pair of male and female connector pins thus connected in series with each other, and the plurality of elements forming such a filter circuit are dividedly provided in the male connector and the female connector.