Abstract: According to one embodiment, a wireless terminal communicates with a server via wireless base stations. The wireless terminal has devices which transmit a signal in a normal-power transmission mode and the signal in a low-power transmission mode, a power control device which switches the normal-power transmission mode to the low-power transmission mode, or vice versa, and a device which transmits current position data to the server. The server detects the position of the wireless terminal, designates one of the base stations which is close to the wireless terminal, when the wireless terminal is set to the low-power transmission mod, and detects whether the base station designated has a problem or not according to detect the signal from the wireless terminal.

Abstract: A coil component comprises: a coil bobbin, which has a coil-winding section in an outer circumferential portion so that a coil is to be wound on the coil-winding section, and which has a through-hole in a central portion thereof; a first core and a second core, which have a plurality of magnetic legs respectively, wherein a certain leg of the plurality of the magnetic legs of the first core and a certain leg of the plurality of the magnetic legs of the second core are inserted into the through-hole of the coil bobbin to face each other with a predetermined gap, and wherein facing surfaces of the certain legs of the magnetic legs are fixed by an adhesive; and a protective cover, which is positioned between the coil bobbin and the certain legs to suppress the adhesive from being attached to the coil bobbin.

Abstract: A coil component comprises: a coil bobbin, which has a coil-winding section in an outer circumferential portion so that a coil is to be wound on the coil-winding section, and which has a through-hole in a central portion thereof; a first core and a second core, which have a plurality of magnetic legs respectively, wherein a certain leg of the plurality of the magnetic legs of the first core and a certain leg of the plurality of the magnetic legs of the second core are inserted into the through-hole of the coil bobbin to face each other with a predetermined gap, and wherein facing surfaces of the certain legs of the magnetic legs are fixed by an adhesive; and a protective cover, which is positioned between the coil bobbin and the certain legs to suppress the adhesive from being attached to the coil bobbin.

Abstract: An inverter transformer includes a core structure, bobbins each including a spool portion and first and second terminal blocks and having a part of the core structure inserted therein, and primary and secondary windings wound around the bobbin, wherein the first and second terminal blocks have recesses formed at their end faces and adapted to lodge terminal pins to tie wire ends of the secondary winding therearound, the distal tip ends of the terminal pins lodged in the recesses of the first and second terminal blocks are positioned either flush with or inward of the end face of the first and second terminal blocks, parts of the core structure are located above the recesses, and the end faces of the core structure oriented substantially orthogonal to an extending direction of the terminal pins are positioned either flush with or outward of the distal tip ends of the terminal pins.

Abstract: To provide a transformer in which costs of a backlight device are reduced by lighting a lamp without requiring an additional member for connecting the lamp to an inverter. A transformer according to the present invention includes terminal bases and in which terminal pins are implanted, a bobbin formed by winding a primary winding and secondary windings and around the outer circumference of a winding core, and a core. A lamp connecting terminal is arranged to the terminal bases and, and an electrode of a lamp is directly connected to the lamp connecting terminal, thereby attaching the lamp to the terminal bases and. The transformer is integrated into an inverter for a backlight device of a liquid crystal display apparatus, thereby lighting the lamp without using an additional member for connecting the lamp to the inverter.

Abstract: A backlight inverter is provided which includes at least one inverter transformer and to which a plurality of cold cathode fluorescent lamps are connected, wherein a plurality of primary windings of the inverter transformer are connected to each other either in series or in parallel, a resonance circuit including a leakage inductance and a capacitance component is formed at the secondary side of the inverter transformer, and wherein the inverter transformer is driven at an operating frequency which is included in a frequency range between a parallel resonance frequency and a series resonance frequency of the resonance circuit and which excludes a frequency range between a first inflection point and a second inflection point of a gain characteristic curve of the inverter transformer.

Abstract: An inverter transformer for lighting multiple discharge lamps is provided which has a plurality of output voltages including reversed polarity output voltages while ensuring a reliable insulation performance, and which is produced in a small size and at a low cost. An inverter transformer includes a magnetic core assembly, and a plurality of bobbins each having a primary winding and a secondary winding wound therearound. Adjacent two bobbins of the bobbins constitute either a first bobbin pair which are provided with respective secondary windings at which output voltages having their polarities reversed from each other are induced, or a second bobbin pair. An insulation distance setting means are provided between the two bobbins so that the distance between the secondary windings disposed at the two bobbins and of the first bobbin pair is larger than the distance between the secondary windings disposed at the two bobbins of the second bobbin pair.

Abstract: An inverter transformer includes a core structure, bobbins each including a spool portion and first and second terminal blocks and having a part of the core structure inserted therein, and primary and secondary windings wound around the bobbin, wherein the first and second terminal blocks have recesses formed at their end faces and adapted to lodge terminal pins to tie wire ends of the secondary winding therearound, the distal tip ends of the terminal pins lodged in the recesses of the first and second terminal blocks are positioned either flush with or inward of the end face of the first and second terminal blocks, parts of the core structure are located above the recesses, and the end faces of the core structure oriented substantially orthogonal to an extending direction of the terminal pins are positioned either flush with or outward of the distal tip ends of the terminal pins.

Abstract: An inverter transformer for lighting multiple discharge lamps is provided which has a plurality of output voltages including reversed polarity output voltages while ensuring a reliable insulation performance, and which is produced in a small size and at a low cost. An inverter transformer includes a magnetic core assembly, and a plurality of bobbins each having a primary winding and a secondary winding wound therearound. Adjacent two bobbins of the bobbins constitute either a first bobbin pair which are provided with respective secondary windings at which output voltages having their polarities reversed from each other are induced, or a second bobbin pair. An insulation distance setting means are provided between the two bobbins so that the distance between the secondary windings disposed at the two bobbins and of the first bobbin pair is larger than the distance between the secondary windings disposed at the two bobbins of the second bobbin pair.

Abstract: A high voltage transformer is provided in which a primary winding is located selectively and optimally with respect to a secondary winding, and so the primary winding is allowed to be tightly coupled electromagnetically to the secondary winding, while the workability in assembly is improved. In the high voltage transformer, a primary winding (8) and a secondary winding (6) are wound around a spool body (3) of a bobbin (1), and a magnetic core made of magnetic material is inserted in the hollow of the bobbin (1). The bobbin (1) includes terminal blocks (2a and 2b) disposed at the both ends of the spool body (3) and provided with a plurality of terminals (5a to 5g), the secondary winding (6) is wound on the outer circumferential surface of the spool body (3), and the primary winding (8) which is constituted by thin conductive sheet coils coated with resin is disposed around the secondary winding (6).

Abstract: A coil bobbin comprises a core housing portion which has a magnet wire wound therearound, and which undergoes a varnish impregnation treatment together with a magnetic core consisting of two core sections, like an EE type or UU type. Core spacing mechanisms are formed on the inner surfaces of the core housing portion, and control a position of the magnetic core inserted in the core housing portion such that the magnetic core is kept apart from the inner surfaces of the core housing portion.

Abstract: A coil bobbin comprises a core housing portion which has a magnet wire wound therearound, and which undergoes a varnish impregnation treatment together with a magnetic core consisting of two core sections, like an EE type or UU type. Core spacing mechanisms are formed on the inner surfaces of the core housing portion, and control a position of the magnetic core inserted in the core housing portion such that the magnetic core is kept apart from the inner surfaces of the core housing portion.

Abstract: A thin film transistor of this invention has a structure obtained by sequentially stacking, on an insulating substrate, a silicon nitride film, a silicon oxide film, a polysilicon thin film with a channel region and source and drain regions facing each other via the channel region, an insulating film, and a gate electrode. The boron concentration decreases from the channel region toward the silicon nitride film in the silicon oxide film region between the channel region and the silicon nitride film. The silicon oxide film region between the channel region and the silicon nitride film is made up of a first region which is in contact with the channel region and has a boron concentration of 1×1016 atoms/cm3 or more, and a second region between the first region and the silicon nitride film, which has a boron concentration of less than 1×1016 atoms/cm3. The first region has a thickness of 200 Å or less.

Abstract: A thin film transistor of this invention has a structure obtained by sequentially stacking, on an insulating substrate, a silicon nitride film, a silicon oxide film, a polysilicon thin film with a channel region and source and drain regions facing each other via the channel region, an insulating film, and a gate electrode. The boron concentration decreases from the channel region toward the silicon nitride film in the silicon oxide film region between the channel region and the silicon nitride film. The silicon oxide film region between the channel region and the silicon nitride film is made up of a first region which is in contact with the channel region and has a boron concentration of 1×1016 atoms/cm3 or more, and a second region between the first region and the silicon nitride film, which has a boron concentration of less than 1×1016 atoms/cm3. The first region has a thickness of 200 Å or less.

Abstract: A thin-film transistor device comprising a pixel section including a plurality of pixel electrodes arranged in rows and columns on a substrate and a plurality of thin-film transistors of reverse stagger type, connected as switching elements to the pixel electrodes, respectively, and a drive section including a plurality of thin-film transistors of coplanar type, each having a gate insulating film, for driving the thin-film transistors of the reverse stagger type. A lower insulating film is located beneath the thin-film transistors of the reverse stagger type. The lower insulating film and the gate insulating films of the thin-film transistors of the coplanar type are formed of a first insulating film provided on the substrate.

Abstract: A device for providing an earth connection in a metal core printed circuit board (2) which is assembled in a shield casing (1) and which has an earth pattern (23) and a metal core (21), includes conductive connecting members (3) having one end soldered to the earth pattern (23) and another end in surface contact with the metal core (21) and the shield casing (1).