Olympus Corporation

Olympus Optical Company, Ltd.

Hitachi Automotive Systems, Ltd.

Hitachi, Ltd.

Hitachi Astemo Ltd.

Akihiro Namba

Takashi Hirao

Tatsuo Nagasaki

Takeshi Tokuyama

Keisuke Fukumasu

Mitsuo Harada

Fumio Uchino

Hirobumi Suzuki

Morinao Fukuoka

Masahiro Ohno

Kouichi Karaki

Takahiro Araki

Hitoshi Tateoka

Outaro Ando

Susumu Takahashi

Hideki Miyazaki

Kinya Nakatsu

Kimihiko Nishioka

Toshiya Satoh

Toshiaki Ishii

Yoshiaki Horikawa

Nobutake Tsuyuno

Hidenori Shinohara

Akira Matsushita

Atsuo Nishihara

Takayoshi Nakamura

Nobuo Yamashita

Hiroshi Ishiwata

Mitsugu Sakai

Hiromi Shimazu

Makoto Ito

Toshimasa Akagi

Akeshi Takahashi

Masanori Sawahata

Morio Kuwano

Takashi Mizusaki

Kunio Ohno

Masami Oonishi

Tetsuya Suto

Kiyochika Ishibashi

Hiroyuki Ooiwa

Hiroshi Houzouji

Ryuji Sawada

Masaru Iino

Ti Chen

A power semiconductor device according to the present invention is provided with a conductive section, a circuit component, a substrate that supports the conductive section and the circuit component, and a sealing member, wherein the sealing member forms a first flow path, and the first flow path has a first region thermally connected to a power circuit and a second region thermally connected to the circuit component.

Power semiconductor device

Electric motor

An object of the present invention is to provide a wheel drive device capable of suppressing a temperature increase in an electric motor and a power conversion device and suppressing occurrence of a failure of an electric component. Provided are: an electric motor having a statorand a rotor; a stator holderthat holds the stator; a power conversion devicethat converts power supplied to the electric motor; and a wheel which accommodates the electric motor, the stator holder, and the power conversion deviceon the inner peripheral side. The stator holderincludes a flow paththrough which a cooling medium flows. The flow pathis arranged between the statorand the power conversion device

Wheel drive device and electric vehicle provided with the same

A power semiconductor device includes a circuit body, first and second insulations, first and second bases, a case, and a distance regulation portion. The circuit body incudes a semiconductor element and a conductive portion. The first insulation and the second insulation oppose each other. The first base and second base also oppose each other. The case has a first opening portion covered with the first base and a second opening portion covered with the second base. The distance regulation portion has a first end that contacts the first base and a second end, that is opposite to the first end, and that contacts the second base. The distance regulation portion regulates a distance between the first base and the second base.

Power semiconductor device having a distance regulation portion and power conversion apparatus including the same

A power conversion device includes first and second power semiconductor elements, and a circuit for transferring a drive signal of the first and second power semiconductor elements. The circuit board includes a first emitter wire which is formed along an arranging direction of the first power semiconductor element and the second power semiconductor element, a first gate wire which is disposed between the first power semiconductor element and the first emitter wire, a second gate wire which is disposed between the second power semiconductor element and the emitter wire, a third gate wire which is disposed to face the first gate wire and the second gate wire with the emitter wire interposed between the third gate wire and the first gate wire and the second gate wire, and a first gate resistor which connects the first gate wire and the third gate wire over the first emitter wire.

Power conversion device for reducing an inductance difference between control signal wires of a power semiconductor and suppressing a current unbalancing of the control signals

In an object of the present invention, an object is to provide a technique for achieving higher accuracy in current detection of a radio frequency current, in a current detection device. The current detection device of the present invention includes two or more conductors through which a current shunted from a same conductor flows; conductors through which the shunted current flows have portions opposed to each other; currents flow in opposite directions in opposing portions of the conductors; and a magnetic field detecting element is provided between the opposing portions of the conductors.

Current detection device

An object of the present invention is to reduce wire inductance without damaging manufacturability of a power converter. A power converter according to the present invention includes a power semiconductor module, a capacitor, and DC bus bars and. The capacitor smooths a DC power. The DC bus bars and transmit the DC power. The DC bus bars and include a first terminal and a second terminal. The first terminal connects to the power semiconductor module. The second terminal connects to the capacitor. The DC bus bars and form a module opening portion to insert the power semiconductor module. The DC bus bars and form a closed circuit such that a DC current flowing between the first terminal and the second terminal flows to an outer periphery of the module opening portion.

Power converter

Provided is a power converter in which a magnetic core of a noise filter can be prevented from magnetic saturation and the noise filter can be downsized. A noise filterprovided in a power converter includes: a magnetic coreformed with a single through-holeA and forming a closed magnetic circuit; first wiringhaving one endconnected to a power conversion circuit and the other end drawn out from the second opening, and running through the through-holeA from one first openingto the other second opening; second wiringhaving one end connected to the other end of the first wiringand the other enddrawn out from the first openingas a filter output end, and running through the through-holeA from the second openingto the first opening; a first capacitorprovided between the ground and a connecting portionof the first wiringand the second wiring; and the second capacitorprovided between the other endof the second wiringand the ground.

Provided is an electronic device that is provided with a filter circuit that suppresses the effects of electromagnetic noise propagated through space from a circuit board and reduces parasitic inductance, and can output a voltage with adequately reduced noise. To solve the above problem, in an electronic device provided with a cabinet (), a circuit board () provided in the cabinet, an output terminal () that passes through a through hole provided in the cabinet and outputs the output of the circuit board to the outside, the present invention constructs a loop composed of a filter means () having a filter capacitor (), an output terminal, a cabinet, and wires () for connecting these parts. The wire () connected to the cabinet is connected to a position close to the output terminal, and reduces the size of the loop. In addition, a shield () is provided between the filter means and the circuit board.

Electronic device

There is provided a retention mechanism for an immersion medium, for use in a device which observes/measures a sample by use of an immersion objective lens, includes a member which retains the immersion medium near a tip portion of the objective lens, wherein the member is configured to include at least first and second materials.

Immersion objective lens, retention mechanism for immersion medium, and manufacturing method

Immersion objective lens, retention mechanism for immersion medium, and manufacturing method thereof

In a biological specimen imaging method, a biological specimen which is stored in a storing section of a substrate having plural storing sections and emitting a feeble light is imaged through an objective lens. The biological specimen imaging method includes moving any one of the substrate and the objective lens or both until the desired storing section falls within the field of view of the objective lens, measuring any one of a focal position at a near point and the focal position at a far point of the objective lens or both, determining the focal position of the objective lens focused on an observed target region in the biological specimen stored in the desired storing section based on the measured focal position, and adjusting the focal position of the objective lens to the determined focal position so as to image the biological specimen through the objective lens.

Biological specimen imaging method and biological specimen imaging apparatus

A focal position determining method determines a focal position of an objective lens focused on an observed target region in a specimen. The focal position determining method includes measuring any one of the focal position of the objective lens at a near point and the focal position of the objective lens at a far point or both so as to determine the focal position of the objective lens focused on the observed target region based on the measured focal position.

Focal position determining method, focal position determining apparatus, feeble light detecting apparatus and feeble light detecting method

The characteristic evaluating system of the present invention includes: a cable-driving transmitter transmitting a signal to one end of a cable to be measured; a load connected to the other end of the cable; a probe detecting a common mode current of the cable; a receiver receiving a signal detected by the probe; and a controller controlling the cable-driving transmitter, the load, and the receiver. The cable-driving transmitter is constructed such that a plural transmission condition is selectable when transmitting the signal. The load is constructed such that plural termination conditions corresponding to the signals transmitted to the cable is selectable. The characteristic of the cable is measured by scanning relative positions of the probe and the cable in a longitudinal direction of the cable.

Characteristic evaluating system and characteristic evaluating method

A measuring apparatus includes a confocal optical microscopy, an excitation light source unit that emits excitation light for generating fluorescence from a fluorescent material, and a light-receiving unit. The confocal optical microscope includes an excitation light input port for taking in excitation light from the excitation light source unit, and an output port for outputting fluorescence generated by the excitation light. The light-receiving unit includes an input portion for taking in signal light containing fluorescence from the confocal optical microscope. An input portion of the light-receiving unit is optically connected to the output port of the confocal optical microscope through an optical fiber.

Light-receiving unit and measuring apparatus including the same

Growing community of inventors

Tokyo, Japan

Akihiro Namba