Fdk Corporation

Kiyoshi Hironaka

Toru Hirohashi

Akihiro Fujii

Hideyuki Akiyama

Katsuo Yamada

Yutaka Ikeda

Nobuaki Ito

Yasuo Yamashita

Kenichirou Suzuki

Kenichiro Suzuki

Akihiro Sudo

Tohru Hirohashi

Masaki Shinoda

A common mode choke coil includes a quadrilateral core; first and second core coversdisposed opposite to each other on the upper and lower surfaces of the coreso as to cover the outer periphery of the core; and rectangular copper wireswound on the opposite side portions of the coreof the first and second core covers. The second core coveris disposed on a component-mounting face. The first and second core coversinclude a pair of linear portions surrounding the corresponding opposite sides of the corewhich linear portions constitute winding portions. The lower surface of the second core coverhas a pedestal portionwhich protrudes more toward the component-mounting face than the winding portions, and extends out along the component-mounting face in a direction perpendicular to axis lines of the winding portions. The lower face at the tip of the protruding part of the pedestal portionhas seat faceson which parts of the rectangular copper wiresdrawn from the winding portionstoward the component-mounting face are provided as mounting terminals. Tip portions of the rectangular copper wiresare bent upward from the seat facesat the edge of the tip of the protruding part of the pedestal portion.

Common-mode choke coil

The present invention provides a transformer including a first bobbin around which a primary coil is wound, a second bobbin which is disposed adjacent to the first bobbin and around which a secondary coil is wound, a core disposed across the first and second bobbins and forming a closed magnetic path. The core is divided into a first core positioned on the side where the first bobbin is present and a second core positioned on the side where the second bobbin is present, and an insulating member is interposed in a magnetically coupled portion between the first core and the second core, the insulating member including outer circumference sheaths that cover at least one of the first and second cores and a barrier interposed between the opposing surfaces of the first and second cores.

Transformer

[Problems] To realize a structure that is substantially highly reliable, that solves a problem of a wire break accompanied by an application of an external force to a terminal and at the same time solves a problem of a wire break caused by heat effects during dip soldering, without causing a strength reduction of the terminal, cost increase, and wire thinning. [Means for Solution] A winding component in which a terminalis disposed in a protruding manner to a bobbinprovided with a winding portion, and a winding end is connected to the terminal, wherein a resin protrusionis formed integral with the bobbin at a foot of the terminal, the resin protrusion is shaped with a part of its circumference notched so that a side surface of the terminal partially juts out, and a wire material that is wound around the resin protrusion a plurality of times comes into contact with the terminal and is to be connected by dip soldering.

Winding component

Variation in inductance and leakage inductance between the secondary windings is reduced thereby making lamp currents uniform and thus preventing the occurrence of uneven brightness. A two-output inverter transformer comprises a bobbin having a primary winding wound around the middle and secondary windings wound on both sides thereof and having a pole-like core inserted into its winding shaft. A rectangle frame-like core is placed to surround the primary and secondary windings such that the pole-like core is opposite the rectangle frame-like core with a gap sheet interposed at either end. Their sizes are set such that L&#x2212;L2 t, where Lis the length of the rectangle frame-like core, Lis the length of the pole-like core, and t is the thickness of the gap sheet, and they are so combined that the pole-like core protrudes evenly from the opposite ends of the rectangle frame-like core.

Inverter transformer

A coil device, which has a coil composed of a core and a winding on the core, and a terminal having a base seat for holding the coil and terminal elements. The coil device has a flange on one side of the core with no flange being provided on the other side of the core. This allows molding by using a mold and can reduce a thickness of the flange of the core and thereby realize a reduction in the thickness of the coil device.

Growing community of inventors

Tokyo, Japan

Kiyoshi Hironaka