Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A cast insulation resin for an electric apparatus having an improved fracture toughness is provided. The cast insulation resin for an electric apparatus is a cast insulation resin used in an electric apparatus, comprising at least either a polar fine elastomer particle or a liquid elastomer having a polar molecule dispersed in an epoxy resin, and a filler formed of at least either an inorganic compound or an inorganic compound having a modified surface thereon with an organic compound.

Abstract: 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.

Abstract: 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.

Abstract: An insulator of an electron beam generator is placed in vacuum, and will be electrically charged upon bombardment of electrons on the surface thereof, whereby a high electrical field is generated. In addition, when fine impurity particles are present on the surface of the insulator, such fine particles will move due to electrostatic force. These could be a cause of electrical discharge, resulting in an unstable accelerating voltage of an electron beam. An electron beam generator is provided in which an electron beam is generated from a cathode upon application of a voltage across the cathode and an anode. An insulator placed in vacuum has a ceramic substrate and a low-resistivity film formed on the surface of the substrate. The electrical volume resistivity of the low-resistivity film is less than or equal to one-hundredth of that of the substrate (see FIG. 2).

Abstract: 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.

Abstract: 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.

Abstract: A charged particle accelerator 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 accelerator 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.

Abstract: 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 layer 4 on at least one face of an insulating substrate 1 and forming the base metal layers 2 and 5 on the insulating resin layer. In the printed wiring board, at least a part of an upper face of the insulating resin layer existing in spaces 11 between the metal conductors is formed at a position lower than the interface between the base metal layer 5 and the insulating resin layer 4.

Abstract: A gradient coil apparatus for magnetic resonance imaging system includes a plurality of gradient coils 11a, 11b and 11c for applying a gradient magnetic field to a test object and an internal heat exchanger 14 to be immersed in insulation oil 13 in a container 12. A pump 16 is disposed to circulate coolant between the internal heat exchanger 14 and an external heat exchanger 15 is disposed outside of the container 12. This arrangement allows the insulation oil only inside of the container, thereby ensuring a substantial reduction in the amount of insulation oil.

Abstract: 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 ?m and equal to or less than 10 ?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.

Abstract: The present invention provides a gradient coil apparatus for magnetic resonance imaging system capable of enhancing electrical insulation performance and cooling performance. A gradient coil apparatus for magnetic resonance imaging system comprising plurality of gradient coils 11a, 11b and 11c for applying a gradient magnetic field to a test object and an internal heat exchanger 14 to be immersed in insulation oil 13 in a container 12. A pump 16 is disposed to circulate coolant between the internal heat exchanger 14 and an external heat exchanger 15 disposed outside of the container 12. This arrangement allows the insulation oil only inside of the container, thereby ensuring a substantial reduction in the amount of insulation oil.

Abstract: 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.

Abstract: 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 ?m and equal to or less than 10 ?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.

Abstract: At least a part of the inner leads 1a of a lead frame 1 is covered with a plating for a metallic fine wire connection, at least the entire portion where the lead frame 1 joins with the adhesive layer 2 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.

Abstract: 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.

Abstract: 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.