Meidensha Corporation

Kabushiki Kaisha Meidensha

Alps Electric Co., Ltd.

Eiichi Takahashi

Toshimasa Fukai

Toshinori Tatsumi

Kaoru Kitakizaki

Toru Tanimizu

Yuichi Nishikiori

Naoki Hayashi

Takao Mizushima

Masahiro Iizuka

Yutaka Naito

Kazuki Iwaya

Kinshiro Takadate

A DC-to-DC converter includes a voltage converter having: a capacitance; at least one inductor configured to store energy and exchange stored energy with the capacitance; and a switching element configured to switch on and off a current flowing through the inductor and change direction of the current at each switching. The inductor includes a variable inductor whose inductance decreases with increase in the current.

DC-to-DC converter

A conductive coating layeris formed on at least one of an inner peripheral side and an outer peripheral side of a base bodyof bellowsby diffusion-bonding. Regarding the diffusion-bonding, the flat conductive coating layeris layered on at least one end surface side of the plate-shaped base body, and these base bodyand conductive coating layerare diffusion-bonded. After forming this diffusion-bonded multilayer member into a tubular body by a drawing process, a side wall of the tubular body is formed into a bellows shape. With these processes, it is possible to obtain the bellows that has the conductive coating layer having a more uniform thickness on the base body of the bellows and has extremely good characteristics (the mechanical characteristics and the electric characteristics).

Bellows and method for manufacturing same

A vacuum capacitor includes a fixed electrode, a movable electrode, a movable electrode shaft, a magnetic flux receiving unit, a magnetic flux generating unit and a capacitance control unit. The fixed electrode is formed from a plurality of electrode members in a vacuum casing. The movable electrode is formed from a plurality of electrode members arranged in gaps formed between the electrode members of the fixed electrode in the vacuum casing. The movable electrode shaft supports the movable electrode. Capacitance appearing between the movable electrode and the fixed electrode is varied by rotation of the movable electrode shaft. The magnetic flux receiving unit rotates the movable electrode shaft in the vacuum casing. The magnetic flux generating unit is located outside the vacuum casing and rotates the magnetic flux receiving unit by magnetic attraction. The capacitance control unit rotates the magnetic flux generating unit.

Vacuum capacitor

A vacuum capacitor includes a fixed electrode, a movable electrode, a movable electrode shaft, a magnetic flux receiving unit, a magnetic flux generating unit and a capacitance control unit. A plurality of electrode members in a vacuum casing form the fixed electrode. The fixed electrode is divided into a plurality of fixed electrodes, and each fixed electrode is lead outside the vacuum casing and electrically connected to each other in series. A plurality of electrode members arranged in gaps between the electrode members of the fixed electrode form the movable electrode. Rotating the movable electrode shaft, which supports the movable electrode, varies capacitance between the movable electrode and the fixed electrode. The magnetic flux receiving unit rotates the movable electrode shaft. The magnetic flux generating unit, located outside the vacuum casing, rotates the magnetic flux receiving unit by magnetic attraction. The capacitance control unit rotates the magnetic flux generating unit.

The present invention can easily adjust capacitance of a vacuum capacitor while maintaining a vacuum state in a vacuum chamber of the vacuum capacitor. A fixed electrodeis formed by arranging a plurality of flat electrode membersin layers at a certain distance in an axial direction of a vacuum chamber. A movable electrodeis formed by arranging a plurality of flat electrode membersin layers at a certain distance in the axial direction of the vacuum chamberand fixing the electrode membersto a movable electrode shaft. By rotation of the movable electrode shaft, each electrode memberis inserted into and extracted from a gap between the electrode membersof the fixed electrodein noncontact with the electrode membersof the fixed electrode. A magnetic flux receiving portionis fixed to a seal memberside of a disk memberthat is provided at the movable electrode shaft. A magnetic flux generating unitprovided at a capacitance control unitis arranged in a direction parallel to the movable electrode shaftwith respect to the magnetic flux receiving portion. By rotating the capacitance control unitalso rotating the magnetic flux receiving portionby magnetic attraction of the magnetic flux generating unit, an overlap area of the movable electrodewith respect to the fixed electrodeis changed, capacitance is then adjusted.

At least one of the conductive members has a hollow storage portion that is formed at the conductive member and a communication hole through which the storage portion and the vacuum chamber communicate with each other, a getter is set inside the storage portion, and an adsorbed object such as metal particles and gas in a vacuum chamber is adsorbed by the getter. By prevent application of the electric field to the getter, even though the electric field appears in a vacuum casing, a temperature of the getter does not reach a re-release temperature, and also electron stimulus desorption phenomenon does not occur, then it is possible to prevent the metal particles and the gas etc. which have been adsorbed once by the getter from being released.

A vacuum capacitor including an insulating cylinder having first and second ends which are opposite to each other. A stationary-side flange is installed to the first end of the insulating cylinder. A stationary electrode supporting plate is installed to an inner surface side of the stationary-side flange. A movable-side flange is installed to the second end of the insulating cylinder. A movable electrode supporting plate is installed to an inner surface side of the movable-side flange through an electrostatic capacity adjusting screw and movable relative to the stationary electrode supporting plate by turning of the electrostatic capacity adjusting screw. Additionally, a diaphragm is sealingly connected between the movable-side flange and the movable electrode supporting plate, the diaphragm having corrugation and defining a vacuum side and an atmospheric side in the vacuum capacitor.

A vacuum capacitor includes a vacuum vessel, stationary and movable electrodes arranged in the vacuum vessel, and a bellows which follows the movable electrode to maintain the hermeticity of the inside of the vacuum vessel and which serves as a current path, wherein the bellows is formed of a conduction high-strength heat resisting alloy.

Bellows for use in vacuum capacitor

A vacuum variable capacitor is includes of a vacuum container which is formed by sealing both end of a cylindrical insulator with a fixed-side end plate and a movable-side end plate, a movable conductive member which is disposed opposite to the fixed-side end plate in the vacuum container, a fixed electrode which is provided on the fixed-side end plate, a movable electrode which is provided on the movable conductive member, a bellows provided in the vacuum container, a rotating portion which is rotatably disposed outside of the vacuum container, and a ball screw through which the movable conductive member is supported by the rotating member.

Vacuum variable capacitor

A vacuum variable capacitor includes an energization bellows arranged in a vacuum vessel and having ends mounted to a movable-electrode support plate and a movable side-end plate, respectively, a heat shielding bellows arranged inside the energization bellows and outside a slide-guide support and having ends mounted to the movable-electrode support plate and the movable side-end plate, respectively, and a cooling pipe interposed between the two bellows and for preventing transfer of heat generated in the energization bellows.

Growing community of inventors

Shizuoka, Japan

Eiichi Takahashi