Abstract: In a transmission antenna provided with an antenna coil outfitted with a core whereon a coil is mounted by winding, and with a capacitor connected to the aforementioned coil forming a serial resonance circuit between the aforementioned antenna coil inductance, the aforementioned antenna coil is outfitted with small core screw with a core smaller than the aforementioned core, and with a joining material that magnetically joins the aforementioned screw to the aforementioned core and with a screw hole that serves as a non-magnetic distance adjuster whereby the distance between the aforementioned core and the aforementioned screw is adjustable, and the resonance frequency is set by adjusting the thread volume of the aforementioned screw.

Abstract: There is provided a micro surface mount coil unit in which the occurrence of positional shift and poor soldering at the time of soldering of the coil unit is avoided without decreasing the width of a coil winding portion of coil form, and the shock resistance of coil unit is increased. The coil unit 10 has a drum-shaped core 11 in which a coil form part around which a coil wire is wound is arranged between flange parts 13 and 14 and a lead frame 12 bondingly fixed to the lower flange part 14. The lead frame 12 has left and right lead frame parts 12A and 12B bonded to the lower flange part 14, and the outside surface of a bottom surface 18 of each of the lead frame parts 12A and 12B is separated into a first region forming an external connecting terminal 15 and a second region not forming the external connecting terminal 15 by notches 17.

Abstract: In a first secondary-side bobbin 50A, a roll surface of a winding section SA2 is located outward in radial direction with respect to a roll surface of a winding section SA1 in the vicinity of a groove 55A, while a roll surface of a winding section SA3 is located outward in radial direction with respect to the roll surface of the winding section SA2 in the vicinity of a groove 56A. Furthermore, the two winding sections SA2, SA3 cross each other so that the respective roll surfaces have substantially oval-coin-shaped cross sections and the respective major axis lines on the cross sections of the respective roll surfaces cross each other when viewed from the Y-axis direction.

Abstract: A surface mount inductor has a drum core, a winding to be wound around a winding shaft section of the drum core, a case body of a nonconductive material to be disposed to surround the winding, a binding terminal fixed to the case body and protruding radially outward from the case body to be bound a winding terminal to, and a metal terminal member having a planar terminal to be a contact portion with a substrate when the surface mount inductor is surface mounted on the substrate. The inductor includes an extended portion protruding radially outward from the case body and having a wider width than or approximately the same width as of the binding terminal, the extended portion being disposed at a overlapping position with the binding terminal in a height direction of the drum core. The winding terminal is wound around from the outer peripheral side of both the binding terminal and the extended portion.

Abstract: In an antenna coil device 11, a coil portion 12 having a lead wire 2 wound around a magnetic core 1 is mounted on a case 3 made of plastic resin, and on one side of the case 3, terminal boards 4 and 5 that electrically connect one end and the other end of the lead wire 2 of the coil portion 12 to an external device are placed in a protruding manner. A through hole 4D is provided in an inserting end portion 4C of the terminal board 4, a through hole 5H is provided in a central flat portion 5G of the terminal board 5, and the two through holes 4D and 5H are placed opposite each other. This reduces stray capacitance caused between the two terminal boards 4 and 5 connected to both ends of the coil portion 12, and allows a self resonance frequency band where an impedance is equal to or above a predetermined value to be shifted to a high frequency side.

Abstract: In the present invention, the safeguarding of the circuit and the step-up transformer can be devised without using the special high-cost components. Voltage supplied by the primary coil (21) of a step-up transformer (2) is switched by a transistor (TR) and the secondary coil (22) of the step-up transformer causes the generation of secondary voltage. In addition to applying said secondary voltage to a cold cathode tube (1), the current flowing through the cold cathode tube (1) is detected, and the transistor (TR) switching function is controlled based on the detection results. To detect the voltage generated by the secondary coil of the aforementioned step-up transformer, a voltage detection coil wrapped around the aforementioned step-up transformer (2) is provided. Abnormalities in the voltage supplied to aforementioned cold cathode tube (1) are detected based on voltage detected by this voltage detection coil (23). Switching by the aforementioned transistor (TR) is stopped when an abnormality is detected.

Abstract: Prevented is disconnection, and generation of the bridging effect which causes short circuits between terminals, when electric wire having an insulating coating and terminals are soldered together, in electronic components which are constituted using electric wire having an insulating coating, the core wire thereof being copper or a copper alloy, and in which electronic components distances between neighboring terminals are narrow. Electric wire having an insulating coating, the base metal of which is copper, and terminal portions (connection portions) are soldered together by means of a lead-free solder alloy, which contains 3.0 to 5.5 wt % copper (Cu); 0.1 to 0.5 wt % nickel (Ni); and 0.001 to 0.1 wt % germanium (Ge), the remainder of the solder alloy consisting of tin (Sn).

Abstract: An inductance device comprises a drum core having a center core, and flanges integrated therewith. The center core is wound with a wire, whereas a magnetic gap is formed between the upper flange and lower flange. The magnetic gap is closed with an insulator, mixed with a magnetic substance, having rubber elasticity. The insulator comprises an overhang and an insertion integrally formed therewith. The overhang presses a region in the upper flange so as to hang from this region. The insertion tightly fits into the magnetic gap.

Abstract: A high-voltage discharge lamp operating device capable of reducing the size and the weight of a DC-DC converter circuit, and accordingly of the operating device without generating any magnetic saturation of a transformer core part even when igniting a lamp in the operating device for operating a HID head lamp for a vehicle.

Abstract: A system for safeguarding the circuit and the step-up transformer can be devised without using the special high-cost components. Voltage supplied by the primary coil (21) of a step-up transformer (2) is switched by a transistor (TR) and the secondary coil (22) of the step-up transformer causes the generation of secondary voltage. To detect the voltage generated by the secondary coil of the step-up transformer, a voltage detection coil wrapped around the step-up transformer (2) is provided. Abnormalities in the voltage supplied to a cold cathode tube (1) are detected based on voltage detected by this voltage detection coil (23). Switching by the transistor (TR) is stopped when an abnormality is detected.

Abstract: A high-voltage transformer 11 is provided with first and second bobbins 21A, 21B wound with primary windings 45A, 45B and secondary windings 46A, 46B respectively, I-shaped first and second cores 30A, 30B fitted into the bobbins 21A, 21B and an H-shaped third core 31 interposed between the cores 30A, 30B. The core 30A and core 31 form a first magnetic circuit and the core 30B and core 31 form a second magnetic circuit, and the primary windings 45A, 45B around the bobbins 21A, 21B are wound in the same direction so that the orientations of magnetic flux in both magnetic circuits match inside the core 31.

Abstract: This is a small-size transformer that is made easily. Two bobbins around which a secondary coil is wound insert into bobbin protrusions from the opening surface side of the first core whereby the two bobbins are positioned in a row. A coiling protrusion around which to wrap a primary coil is formed in the aforementioned first core. Part of the primary coil coils around the coil protrusion and the remainder is positioned and coiled in a groove of the aforementioned first core provided in the outer circumference of the two bobbins. A second core is positioned in a countering position to the opening surface of the aforementioned first core so as to cover the aforementioned three protrusions.

Abstract: An inductance element having a drum core around which a winding is to be wound and a ring core surrounding a circumference of the drum core, in which projections are provided either on an outer side surface of an upper flange section of the drum core or an inner side surface of the ring core, and recessions are provided in the other side surface to fit with the projections, each of the recession having an inclined plane inclining from the deepest part of the recession toward the outer edge on one side of the recession and having a bilaterally asymmetric cross-sectional shape with respect to a perpendicular line drawn from the deepest part to an opening of the recession viewing from the direction of an upper surface of the ring core.

Abstract: This is a small-sized transformer that is made easily. Two bobbins around which a secondary coil is wound insert into bobbin protrusions from the opening surface side of the first core whereby the two bobbins are positioned in a row. A coiling protrusion around which to wrap a primary coil is formed in the aforementioned first core. Part of the primary coil coils around the coil protrusion and the remainder is positioned and coiled in a groove of the aforementioned first core provided in the outer circumference of the two bobbins. A second core is positioned in a countering position to the opening surface of the aforementioned first core so as to cover the aforementioned three protrusions.

Abstract: A high-voltage transformer for lighting a plurality of discharge lamps has a primary coil for inputting an AC voltage and a secondary coil for outputting a predetermined AC voltage higher than the AC voltage inputted. The primary coil has a starter primary winding for initially lighting the discharge lamps, and a normal lighting primary winding for normally lighting the discharge lamps.

Abstract: In an antenna coil device 11, a coil portion 12 having a lead wire 2 wound around a magnetic core 1 is mounted on a case 3 made of plastic resin, and on one side of the case 3, terminal boards 4 and 5 that electrically connect one end and the other end of the lead wire 2 of the coil portion 12 to an external device are placed in a protruding manner. A through hole 4D is provided in an inserting end portion 4C of the terminal board 4, a through hole 5H is provided in a central flat portion 5G of the terminal board 5, and the two through holes 4D and 5H are placed opposite each other. This reduces stray capacitance caused between the two terminal boards 4 and 5 connected to both ends of the coil portion 12, and allows a self resonance frequency band where an impedance is equal to or above a predetermined value to be shifted to a high frequency side.

Abstract: There is provided a micro surface mount coil unit in which the occurrence of positional shift and poor soldering at the time of soldering of the coil unit is avoided without decreasing the width of a coil winding portion of coil form, and the shock resistance of coil unit is increased. The coil unit 10 has a drum-shaped core 11 in which a coil form part around which a coil wire is wound is arranged between flange parts 13 and 14 and a lead frame 12 bondingly fixed to the lower flange part 14. The lead frame 12 has left and right lead frame parts 12A and 12B bonded to the lower flange part 14, and the outside surface of a bottom surface 18 of each of the lead frame parts 12A and 12B is separated into a first region forming an external connecting terminal 15 and a second region not forming the external connecting terminal 15 by notches 17.

Abstract: A high-voltage transformer for lighting a plurality of discharge lamps has a primary coil for inputting an AC voltage and a secondary coil for outputting a predetermined AC voltage higher than the AC voltage inputted. The primary coil has a starter primary winding for initially lighting the discharge lamps, and a normal lighting primary winding for normally lighting the discharge lamps.

Abstract: An inductance device comprises a drum core having a center core, and flanges integrated therewith. The center core is wound with a wire, whereas a magnetic gap is formed between the upper flange and lower flange. The magnetic gap is closed with an insulator, mixed with a magnetic substance, having rubber elasticity. The insulator comprises an overhang and an insertion integrally formed therewith. The overhang presses a region in the upper flange so as to hang from this region. The insertion tightly fits into the magnetic gap.

Abstract: An inverter transformer is formed of first and second cores arranged to face each other to form a closed magnetic circuit. The first core has a central leg, an outer perimeter wall, and a partition between the central leg and the outer perimeter wall so that a first groove is formed between the central leg and the partition and a second groove is formed between the partition and the outer perimeter wall concentrically with and outside the first groove. A primary winding is disposed in the second groove, and a secondary winding is disposed in the first groove so that the primary and secondary windings are arranged in the same plane.