Tdk Corporation

Satoshi Shinbo

Nobuo Kitajima

Masaaki Iwakura

Hiroshi Maeda

Katsumi Kobayashi

Katsuhiro Ishigaki

Masaru Kumagai

Satoshi Sugimoto

Terumasa Toyoda

Masahiro Gamou

A transformercomprises a bobbin. A cylinder portionof the bobbinis provided with a first winding partwhere a first wireis wound and a second winding partwhere a second wireis wound at a position different from the first winding partin an axial direction. At an outer circumference of the cylinder portionlocated between the first winding partand the second winding part, an insulating partition collaris formed. On the first winding part, a winding partition collar, separating in respective sections S, S, is formed. On the winding partition collar, at least one communication groovea, communicating the sections S, Sadjacent to each other is formed. The first wireis &#x3b1;-wound around the first winding part

Transformer and leakage transformer

A coil device includes a bobbin, a first winding part, and a second winding part. A partition portion is formed on an outer peripheral surface of the bobbin. The first winding part is wound around the outer peripheral surface at one side of the partition portion. The second winding part is wound around the outer peripheral surface at the other side of the partition portion and has an inner winding layer and an outer winding layer located farther to the outer peripheral surface at the other side than the inner winding layer.

Coil device and method for manufacturing the same

A transformercomprises a bobbin. A cylinder portionof the bobbinis provided with a first winding partwhere a first wireis wound and a second winding partwhere a second wireis wound at a position different from the first winding partin an axial direction. At an outer circumference of the cylinder portionlocated between the first winding partand the second winding part, an insulating partition collaris formed. On the first winding part, a winding partition collar, separating in respective sections S, S, is formed. On the winding partition collar, at least one communication groove, communicating the sections S, Sadjacent to each other is formed. The first wireis &#x3b1;-wound around the first winding part

Transformer

Coil component

A choke coil includes a pair of E-shaped cores, first and second coil windings around central legs of the E-shaped cores, and an I-shaped core. Side legs of the pair of E-shaped cores are positioned face to face with each other with the I-shaped core intervening. There are gaps between the I-shaped core and each central leg. Electrical currents flow in the first and second coil windings in the same direction, and magnetic fluxes generated by each of the electrical currents are in opposite directions in the I-shaped core.

Choke coil for interleaved PFC circuit

Core for electronic component

A discharge lamp drive apparatus includes: an inverter circuit; a transformer; a plurality of discharge lamp connection terminals; a plurality of ballast capacitors; a plurality of voltage detection circuits; and a signal processor. Each voltage detection circuit has first and second voltage detection elements constituting a series circuit. Each series circuit has a first end connected with a corresponding one of the discharge lamp connection terminals and a second end connected with a grounding terminal. The signal processor generates a signal indicating an open state of a discharge lamp by using an average value and a peak value of voltages appearing between connection points of the first and second voltage detection elements and the grounding terminals.

Discharge lamp drive apparatus and liquid crystal display apparatus

There are provided a discharge lamp drive apparatus which can detect that both ends of at least one of a plurality of discharge lamps is in an open state in a differential drive scheme, and a liquid crystal display apparatus. A first current detection circuitdetects a current flowing through a first discharge lamp connection terminal group Por a current flowing through a second discharge lamp connection terminal group P, and generates a first current detection signal S. A second current detection circuitdetects a current flowing through the second discharge lamp connection terminal group Por a current flowing through a fourth discharge lamp connection terminal group P, and generates a second current detection signal S. A signal processorreceives the first current detection signal Sand the second current detection signal S, and generates a signal Swhich is used to detect an open state of a discharge lamp based on intensities of both the current detection signals Sand S

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Tokyo, Japan

Satoshi Shinbo