Taiyo Yuden Co., Ltd.

Dexerials Corporation

Kentaro Morito

Daiki Ishii

Tomokazu Ikenaga

Masayoshi Kanno

Yoshiki Iwazaki

Masayuki Fujimoto

Toshimasa Suzuki

Masashi Natsume

Shoichi Sekiguchi

A variable capacitance device includes: capacitors coupled in series between first and second signal terminal electrodes, each of the capacitors having a dielectric layer, a lower electrode and an upper electrode, a permittivity of the dielectric layer changing according to a voltage applied to the dielectric layer, the lower and upper electrodes sandwiching the dielectric layer; resistance films coupled between the capacitors and a bias terminal electrode; a first insulating film that contacts the resistance films; and a second insulating film that covers the capacitors, the resistance films and the first insulating film, wherein: a thermal conductivity of the first insulating film is larger than that of the second insulating film; and at least one of the resistance films has a pair of connection patterns provided on both ends thereof and resistance patterns that are coupled in parallel between the connection patterns.

Variable capacitance device and antenna device

A variable capacitance device includes: (A) a first signal line that contains multiple first variable capacitance elements connected in series; (B) a second signal line that contains multiple second variable capacitance elements connected in series; (C) a first bias line used for applying a first direct-current voltage to each of the multiple first variable capacitance elements and multiple second variable capacitance elements; and (D) a second bias line used for applying a second direct-current voltage to each of the multiple first variable capacitance elements and multiple second variable capacitance elements. And, a part of at least one of the first bias line and second bias line is arranged so that it passes between two adjacent first variable capacitance elements among the multiple first variable capacitance elements.

Variable capacitance device and communication apparatus

A control device according to the present invention is provided with (A) a variable capacitance device including a variable capacitance element, and (B) a control unit configured to apply a control voltage with a first polarity to the variable capacitance device during a third period including a first period to perform communication using the variable capacitance device and a second period not to perform communication before the first period, and configured to apply a control voltage with a second polarity opposite to the first polarity to the variable capacitance device during a sixth period including a fourth period to perform communication and a fifth period not to perform communication before the fourth period.

Control device for variable capacitance device and communication device including said control device

A variable capacitance device includes: a supporting substrate having a plurality of variable capacitance elements formed thereon, the plurality of variable capacitance elements being connected in series, wherein each of the plurality of variable capacitance elements has a separate lower electrode, or at least some of the plurality of variable capacitance elements share a lower electrode, thereby forming a plural set of the lower electrodes that serves as the lower electrodes of the respective variable capacitance elements, wherein the variable capacitance device further includes an insulating moisture-resistant film and a conductive adhesive film, and wherein the conductive adhesive film and the insulating moisture-resistant film have a gap in a plan view between at least some of regions where the plural set of the lower electrodes are respectively formed so as to avoid electrical leakage between said at least some of regions through the conductive adhesive film.

A thin film electronic component includes: a substrate; a thin film electrode layer over the substrate; an inorganic insulation layer formed on the thin film electrode layer; an organic insulation layer formed on the inorganic insulation layer; and a lead-out electrode that electrically connects to the thin film electrode layer. The inorganic insulation layer has a through-hole formed therein, so as to expose a portion of the thin film electrode layer. The organic insulation layer has a through-hole formed therein, so as to expose the through-hole in the inorganic insulation layer. The lead-out electrode is formed in the through-hole in the inorganic insulation layer and the through-hole in the organic insulation layer. A shape of a borderline defining the through-hole at a top surface of the organic insulation layer in a plan view has chamfered corners.

Thin film electronic component

A variable capacitance device includes: a first and second terminal for signals; a plural, even number of variable capacitance elements connected in-series between the first and second terminal; a third and fourth terminal for receiving a same voltage; a fifth and sixth terminal for grounding; a plurality of first resistors connected to either the third or fourth terminal on one end; and a plurality of second resistors connected to either the fifth or sixth terminal on one end. With respect to a series of successive nodes beginning with the first terminal and ending with the second terminal, respective other ends of a pair of the first resistors are connected to every other node, and respective other ends of a pair of the second resistors are connected to the remaining every other node, such that the pairs of first and second resistors are alternately connected to the series of successive nodes.

Variable capacitance device and antenna apparatus

An object of the present invention is to provide a multi-layer ceramic capacitor that includes a laminated blockformed by laminating ceramic dielectric layersand internal electrodesalternately, a pair of cover layerslaminated on top and bottom of the laminated block, a ceramic bodyformed on both side surfaces of the laminated block, and a pair of external electrodeselectrically connected to the internal electrodesand that can effectively prevent an occurrence of a crack. In the multi-layer ceramic capacitor, a silicate crystal made of an oxide including Ba and Si or a silicate crystal made of an oxide including Ti and Si is formed in boundary portions between the laminated blockand the ceramic bodies

Growing community of inventors

Tokyo, Japan

Kentaro Morito