Hitachi, Ltd.

Hitachi-high-technologies Corporation

Renesas Technology Corp.

Hitachi Medical Corporation

Ryozo Takeuchi

Junpei Kusukawa

Hiroshi Morita

Koji Obata

Munetoshi Unuma

Kenichi Anjyo

Toshiyuki Yokosuka

Kazutoshi Kobayashi

Tsuneya Kurihara

Yoshiaki Usami

Koji Amakawa

Takanori Satoo

Yoshiaki Tsumuraya

Tetsuya Nagata

Hiromichi Suzuki

Makoto Tsumura

Toshiaki Ishii

Tomoyuki Miyata

Hirotaka Takeshima

Fujio Ito

Hiroaki Takatsuki

Takafumi Nishita

Takashi Yasuhara

Tatsuo Igawa

Takeshi Yatsuo

Ayumu Hatanaka

Akihiko Kameoka

Akira Kurome

Takayuki Koizumi

Yasuaki Suzuki

Hidemitsu Kobayashi

Akio Yajima

Takanori Sato

Masao Yanaka

Joji Nishiyama

Eturo Hirose

Yoshitaka Seki

Masaru Yamada

In a charged particle accelerator, voltage of several tens of kV is applied between accelerating electrodes. In such a case, electric discharge is sometimes generated between the accelerating electrodes. In the charged particle accelerator, part or entirety of the accelerating electrodes is coated with an electric discharge suppressing layer made of ceramics or alloy having a high melting point as compared with metal. When impurity fine particles are accelerated by an electric field and collide with the electrodes, the electric discharge suppressing layer made of ceramics or alloy prevents metal vapor from being easily generated from the electrodes and an ionized plasma from being easily produced, thus suppressing electric discharge between the electrodes.

Charged particle accelerator

The present invention provides an X-ray tube that improves and stabilizes a withstanding voltage performance and thus ensures the reliability of a product. The present invention is an X-ray tube comprising a cathode for emitting electrons, an anode for emitting an X-ray which an irradiation of the electrons emitted from the cathode causes, and a glass tube for confining the cathode and the anode in a vacuum, wherein an inside surface of the glass tube is covered with a glass thin film having a melting point lower than that of a glass of the glass tube and particles adhered to the glass tube by the glass thin film.

X-ray tube

A charged particle beam apparatus in which discharge is less likely to occur between a charged particle source, and an extraction electrode, and an acceleration electrode without the need for increasing the capacity of a high voltage power supply for extraction. The charged particle beam apparatus includes a charged particle source which emits charged particles, an extraction electrode which extracts the charged particles from the charge particle source and an acceleration electrode which accelerates the extracted charged particles. A surge absorber is electrically connected between at least two of the charged particle source, the extraction electrode, and the acceleration electrode.

Charged particle beam apparatus

A stator coil is configured of a first group of six turns of conductive wire, and a second group also of six turns, with the first group of six turns being wound on a spool, leaving a gap the same as the diameter of the conductive wire between winds. Upon completion of winding the first group, the winding is turned back, and the second group of six turns is wound in the gap, so as to be adjacent to the turns of the first group. The article is then inserted into a slot in a stator core of a stator, thereby configuring a stator coil. This provides for a rotating electrical machine and manufacturing method thereof with improved insulation resistivity regarding inverter surge voltage, and moreover high output can be obtained with a machine of comparable external dimensions with conventional machines.

Rotating electrical machine and manufacturing method thereof

The present invention provides a printed wiring board which has high insulation resistance between wirings and is unlikely to cause failures such as leakages or short circuits, attributable to ion migration even in high temperatures and highly humid environments. The printed wiring board has a circuit comprising a metal conductor on base metal layers created by forming an insulating resin layeron at least one face of an insulating substrateand forming the base metal layersandon the insulating resin layer. In the printed wiring board, at least a part of an upper face of the insulating resin layer existing in spacesbetween the metal conductors is formed at a position lower than the interface between the base metal layerand the insulating resin layer

Printed wiring board and electronic device using the same

A gradient coil apparatus for magnetic resonance imaging system includes a plurality of gradient coilsandfor applying a gradient magnetic field to a test object and an internal heat exchangerto be immersed in insulation oilin a container. A pumpis disposed to circulate coolant between the internal heat exchangerand an external heat exchangeris disposed outside of the container. This arrangement allows the insulation oil only inside of the container, thereby ensuring a substantial reduction in the amount of insulation oil.

Gradient coil apparatus for magnetic resonance imaging system

The invention improves an insulating performance of an X-ray tube without increasing an insulation size. An X-ray tube in accordance with the invention keeps a mechanical strength of a glass insulation material and improves an insulation withstand voltage by a concavity and convexity, by forming a concavity and convexity having an arithmetic mean surface roughness of JIS B0601-1994 equal to or more than 1.0 &#x3bc;m and equal to or less than 10 &#x3bc;m in a vacuum side surface of a glass insulation material supporting electric conductors within a vacuum chamber for a range equal to or more than 2 mm from a position in an end of the electric conductors.

At least a part of the inner leads of a lead frame is covered with a plating for a metallic fine wire connection, at least the entire portion where the lead frame joins with the adhesive layer is covered by at least one metal or alloy thereof different from the metallic fine wire connecting use plating. The metal or alloy is selected from the group consisting of gold, platinum, iridium, rhodium, palladium, ruthenium, indium, tin, molybdenum, tungsten, gallium, zinc, chromium, niobium, tantalum, titanium and zirconium. Thereby, generation of defects, such as leakage and shorting, due to ion migration can be prevented.

Semiconductor device

A method for manufacture of a resin block includes setting high-voltage and low-voltage side conductors in dies, assembling the dies, extruding resin so as to form a resin block having the high-voltage side conductor and the low-voltage side conductor embedded therein, cooling the molded resin block, and taking out the molded resin block from the dies.

Method of manufacture of resin block

A resin block insulating system comprising a plurality of resin blocks laid so as to cover a high-voltage part. Each of the resin blocks has a side surface opposite to a side surface of an adjacent resin block via a gap formed therebetween. The side surfaces are substantially parallel with each other and extend in an inclined direction with reference to a thickness direction of the resin block insulating system so as to extend an insulation length of the gap.

Resin block insulating system

In order to restrict a local concentration of an electric field in a conductor layer end portion of an insulating circuit board and increase a partial electric discharge starting voltage, thereby improving an insulating reliability of the insulating circuit board and a power semiconductor apparatus employing the same, the present invention provides a method of manufacturing a insulating circuit board comprising the step of applying a voltage between the circuit patterns of the insulating circuit board in an atmospheric or depressurized gas so as to allow the circuit board to discharge electricity, or irradiating a laser beam, thereby a projection shape of the end portion of the electrode conductor is melted and smoothened so as to restrict the concentration of the electric field.

Insulating circuit board and power semiconductor apparatus employing the same

An ignition coil for an internal-combustion engine has satisfactory electrical insulation capacity and is excellent in reliability and durability. The ignition coil for an internal-combustion engine comprises a primary bobbin on which a primary coil is wound, a secondary bobbin on which a secondary coil is wound, and a center core. The area of a cross section of the center core perpendicular to an axis of the coils at a position on the inner side of the opposite ends of the center core is a maximum.

Ignition coil for internal-combustion engine

An ignition coil comprises a center magnetic core, a secondary coil wound on a secondary coil bobbin which is arranged at an outer side of said center magnetic core, a primary coil wound on a primary coil bobbin which is arranged at an outer side of said secondary coil. At least one of said secondary coil bobbin and said primary coil bobbin is formed by a, material which contains sulfur in a main chain of an aromatic class. The ignition coil has a superior anti-electric treeing. A coil component of the secondary coil and the primary coil of the ignition coil is arranged and accommodated in a coil case, an epoxy resin filling up at least melting silica is potted and is hardened. A development of the electric treeing can be restrained and the ignition coil having a superior endurance performance can be provided.

Ignition coil for use in internal combustion engine

An ignition coil comprises a center magnetic core, a secondary coil wound on a secondary coil bobbin which is arranged at an outer side of said center magnetic core, a primary coil wound on a primary coil bobbin which is arranged at an outer side of said secondary coil. At least one of said secondary coil bobbin and said primary coil bobbin is formed by a material which contains sulfur in a main chain of an aromatic class. The ignition coil has a superior anti-electric treeing. A coil component of the secondary coil and the primary coil of the ignition coil is arranged and accommodated in a coil case, an epoxy resin filling up at least melting silica is potted and is hardened. A development of the electric treeing can be restrained and the ignition coil having a superior endurance performance can be provided.

Growing community of inventors

Hitachi, Japan

Ryozo Takeuchi