Abstract: A position detector having a movable permanent magnet (5), a circuit board (6) having a magnetic sensor element (1) for detecting the movement of the permanent magnet and a molded resin case (2) supporting the circuit board. The circuit board (6) is surrounded by a box-shaped radiation shield (12) for shielding the circuit board against external electromagnetic radiation. The radiation shield is insert-molded in the mold resin case as its integral part. The radiation shield (12) includes a shield main body (12a) having an open end and a shield cover (12b) closing the open end of the shield main body. The molded resin case (2) has a cavity (2a) open on the same side as the open end of the shield main body (12a) and a case cover (2b) attached to the case opening for closing the cavity.

Abstract: A linear positional displacement detector including a magnetic sensor unit (23) having a magnetic sensing surface formed by a ferromagnetic magnetoresistance element (23a) having a predetermined pattern, and an elongated permanent magnet (22) having a magnetic pole face (22a) at each end. The permanent magnet (22) is movable along its longitudinal axis and magnetically coupled with the magnetic sensor unit (23) with the longitudinal axis positioned on an extended surface of the magnetic sensing surface (23b). A positional displacement of the permanent magnet (22) along the longitudinal axis is detected as a change in the direction of a magnetic flux crossing in parallel the magnetic sensing surface (23b).

Abstract: A method for manufacturing a position detector having a movable permanent magnet (5) and a circuit board (6) having a magnetic sensor circuit (10.about.13) mounted thereon for detecting the displacement of the permanent magnet. A selective connection portion (8,9) in the magnetic sensor circuit capable of being selectively placed into at least two different circuit patterns exhibiting two different output characteristics (A,B) is provided. Then, the connection in the selective connection portion (8,9) is changed by adding an electrical conductor (FIGS. 1a, 1b) or removing (FIGS. 2a, 2b) portions of pattern conductors in the selective connection portion (8,9) to place the magnetic sensor circuit into either one of the at least two different circuit patterns (FIGS. 4,5) according to necessity.

Abstract: An ignition coil device for an internal combustion engine includes an air gap between the two heat generating sources, the coil assembly and the power transistor unit, such that the coil assembly and the power transistor unit are thermally isolated from each other. Further, the primary winding bobbin has an inner projection inserted into the air gap of the core to maintain the gap. Furthermore, the primary winding bobbin and the secondary winding bobbin each has a first and a second bobbin attachment portion. First the high voltage tower attachment portion of the high voltage tower is engaged with the bobbin attachment portion on the secondary winding bobbin and the connector attachment portion of the connector is engaged with the bobbin attachment portion on the primary winding bobbin, to form respective integral sub-units.

Abstract: An ignition coil device for an internal combustion engine includes an air gap between the two heat generating sources, the coil assembly and the power transistor unit, such that the coil assembly and the power transistor unit are thermally isolated from each other. Further, the primary winding bobbin has an inner projection inserted into the air gap of the core to maintain the gap. Furthermore, the primary winding bobbin and the secondary winding bobbin each has a first and a second bobbin attachment portion. First the high voltage tower attachment portion of the high voltage tower is engaged with the bobbin attachment portion on the secondary winding bobbin and the connector attachment portion of the connector is engaged with the bobbin attachment portion on the primary winding bobbin, to form respective integral sub-units.

Abstract: An ignition coil unit for an internal combustion engine comprising a coil case containing an ignition coil and an ignitor case containing an ignitor for controlling a coil primary current. A heat sink is connected between the coil case and the ignitor case for dissipating heat generated in the ignitor and supporting the ignitor case on the coil case. An additional support member is provided between the ignitor case and the coil case for detachably attaching the ignitor case to the coil case. The additional support means may comprise a bridge member connected between an electrical connector for the ignitor and the ignitor case for connecting them into a unitary structure, and the bridge member may be disposed within the coil case and held within the coil case by a resin filler material.

Abstract: An ignition coil device for an internal combustion engine includes an air gap between the two heat generating sources, the coil assembly and the power transistor unit, such that the coil assembly and the power transistor unit are thermally isolated from each other. Further, the primary winding bobbin has an inner projection inserted into the air gap of the core to maintain the gap. Furthermore, the primary winding bobbin and the secondary winding bobbin each has a first and a second bobbin attachment portion. First the high voltage tower attachment portion of the high voltage tower is engaged with the bobbin attachment portion on the secondary winding bobbin and the connector attachment portion of the connector is engaged with the bobbin attachment portion on the primary winding bobbin, to form respective integral sub-units.

Abstract: An ignition coil unit for an internal combustion engine comprising a magnetic iron core, a primary coil wound around the iron core, a secondary coil electromagnetically coupled with the primary coil, a control circuit for controlling a primary electric current, and a case containing the iron core, the primary coil, the secondary coil and the control circuit therein. The ignition coil unit may further comprise a heat sink attached to the iron core, and the mold case may contain and integrally support the iron core and the heat sink, with at least part of the heat sink exposed to exterior of the mold case. The mold case defines a cavity containing therein the primary coil and the secondary coil wound around the iron core, and the space around the primary and second coils within the cavity is filled by a resin material.

Abstract: A housing structure of an ignition coil assembly for an internal combustion engine is disclosed, in which the coil assembly and the igniter are accommodated in a single casing. The coil assembly is wound around a leg of a rectangular core having a yoke portion running parallel to it. The casing accommodates the coil assembly and the leg of the core carrying it, leaving exposed to the outside the yoke of the core; a space is formed between a side of the coil assembly and a side wall of the casing. A plate-shaped heat sink abutting on the yoke of the core at its lower end extneds witin the casing between the coil assembly and the casing through said space, forming within the space a hollow receptacle between opposing surfaces of the coil assembly and the casing. The igniter is mounted to the heat sink within the hollow receptacle. The housing structure is attached to the body of an automobile, etc., at a surface of the heat sink abutting on the yoke of the core.