Tdk Corporation

Masahiro Gamou

Hiroshi Maeda

Satoshi Sugimoto

Nobuo Kitajima

Katsuhiko Shimizu

Satoshi Shinbo

Junichi Yamamoto

Masakazu Takagi

Terumasa Toyoda

Ge Li

Satoshi Horikami

A coil component includes a first core having a leg portion, a second core joined to the first core with the leg portion therebetween, and a magnet disposed between the leg portion and the second core. Movement of the magnet in a first direction intersecting a direction in which the first core and the second core face each other is at least restricted by an uneven structure provided on a junction surface between the magnet and at least one of the first core and the second core.

Coil component

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

Discharge lamp drive apparatus and liquid crystal display apparatus

A planar coil includes a winding of N turns (N is an integer greater than or equal to 2). Letting r(n) be a radius of an inner circumference of a winding portion at the nturn (n is an integer greater than or equal to 1 and less than or equal to N) from the inner side; r(n) be a radius of an outer circumference of the same; rbe a radius of an inner circumference of the innermost winding portion; Wbe a difference between a radius of an outer circumference of the outermost winding portion and the radius of the inner circumference of the innermost winding portion; and D be a distance between winding portions at adjacent turns, the r(n) and r(n) are determined so as to minimize a value of A expressed by equation (1) when the r, Wand D are given.

Planar coil and planar transformer

A rectifying circuit having a pair of input terminals at which voltage having an AC waveform appears, a plurality of first rectifying elements a plurality of second rectifying elements a first wiring pattern for connecting one of the paired input terminals to the plurality of first rectifying elements and a second wiring pattern for connecting the other of the paired input terminals to the plurality of second rectifying elements In the rectifying circuit, the plurality of first rectifying elements and the plurality of second rectifying elements are laid out so that at least two boundaries between the first and second rectifying elements adjacent to each other are present. With such a layout of the rectifying elements, current flow paths between one of the input terminals and the plurality of first rectifying elements and current flow paths between the other of the input terminals and the plurality of second rectifying elements are closely disposed. Therefore, AC resistance Rac in the first wiring pattern and the second wiring pattern is effectively reduced.

Rectifying circuit and switching power supply device having the same

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Tokyo, Japan

Masahiro Gamou