Fuji Photo Optical Co., Ltd.

Kokusai Denshin Denwa Kabushiki Kaisha

Tdk Corporation

Smk Corporation

Kokusai Denshin Denwa Co., Ltd.

Tokyo Shibaura Denki Kabushiki Kaisha

Toshiba Mitsubishi-Electric Industrial Systems Corporation

Kddi Corporation

Adv Antest Corporation

Yokogawa Electric Corporation

Toppan Printing Co., Ltd.

Fujinon Corporation

Kabushiki Kaisha Daini Seikosha

Toyo Ink Manufacturing Company

Tmeic Corporation

Fumio Watanabe

Yoshihiko Mizuguchi

Yoshikazu Itoh

Akira Yamaguchi

Haruo Yoshida

Yoshio Takeuchi

Yosuke Sakai

Hiroshi Kamiyama

Kumio Ozeki

Naozumi Ishikawa

Toshinori Suzuki

Yoshihiro Ashihara

Shinichi Nomoto

Hideo Kanda

Xiaoqiu Wang

Masahisa Okada

Isao Nishizono

Yasusuke Sakurabayashi

Hidetaka Minakawa

Shin-ichi Wakana

Masashi Nakamura

Yuji Watanabe

Yukiko Nagatoshi

Tomokazu Ito

Kazuya Yoneyama

Tomonaga Nishikawa

Satoshi Yahagi

Masaaki Taguchi

Yasuhiro Suegara

Kazunori Yamada

Hajime Nakamura

Tadashi Watanabe

Masanobu Fujioka

Kimiaki Nakazawa

Minoru Murayama

Kouji Kawamura

Fumio Kobayashi

Yoshio Shimada

Fumihiro Tanaka

Hidemasa Sakurada

Masayoshi Ohashi

Toshio Watanabe

Matsuichi Yamada

Satoshi Takeshita

Kouichiro Kitagawa

Hisato Iwai

Shunji Wake

Chiharu Watanabe

Kazuyuki Komatsu

Makoto Konno

Tatsuhiko Takahashi

Hiroyuki Kikuta

Osam Kamishima

Yoshimi Yoshida

Tohru Sato

Yoshihiko Nodera

Murato Moteki

Mitsuhiko Endo

Yoshinori Watanabe

Tetsuya Okamoto

A semiconductor switch drive device () includes a drive unit (), a power supply unit (), a switch (), and a control unit (). The drive unit () supplies a control signal to a semiconductor switch (Q) of a main circuit () and drives the semiconductor switch (Q). The power supply unit () supplies electric power to the drive unit (). The switch () cuts off supply of electric power to the power supply unit () by detecting or controlling an overvoltage state on a primary side of the power supply unit (). The control unit () switches a conductive state of the switch () on the basis of a voltage of a control terminal of the semiconductor switch (Q).

Power conversion device, semiconductor switch drive device, and control method

A power conversion device includes an inverter, a current detector, a frequency analysis processor, a storage, a determination unit, a reference rotational rate change unit, and a rate controller. The determination unit determines a frequency at which a signal component having a magnitude exceeding a prescribed value has been detected among frequency components of a load current, generates restriction information for excluding a reference rotational rate for a rotational rate corresponding to the detected frequency based on a determination result after the determination, and causes the storage to store the generated restriction information. The reference rotational rate change unit changes a reference rotational rate of an electric motor so that mechanical resonance of the detected frequency is avoided based on the stored restriction information. The rate controller controls a rotational rate of the inverter using the changed reference rotational rate. The electric motor is driven at the controlled rotational rate.

Power conversion device and electric motor drive system

A drive control unit that performs vector control of a synchronous motor determines reference phase angles of 3-phase/DQ converters, and a DQ/3-phase converter. When speed of a synchronous motor is equal to or higher than a predetermined threshold value, the reference phase angle is obtained by adding a correction angle such that D-axis voltage feedback output from 3-phase/DQ converter becomes zero to the detection angle of a position detector. And when the speed of the synchronous motor is less than a predetermined threshold value, the reference phase angle is obtained by adding a low speed load angle set in advance to the detection angle of the position detector. In a vector control operation, a power factor is achieved by controlling the D-axis current to be zero.

Control apparatus for a synchronous motor

Disclosed herein is a coil component that includes a first planar spiral conductor; a second planar spiral conductor laminated on the first planar spiral conductor and wound in an opposite direction to the first planar spiral conductor; a first external terminal electrically connected to an outer peripheral end of the first planar spiral conductor; a second external terminal electrically connected to an outer peripheral end of the second planar spiral conductor; and a third external terminal electrically connected in common to inner peripheral ends of the first and second planar spiral conductors.

Coil component and circuit board in which coil component are embedded

A base station device (E-UTRAN) assigns a frequency band unsupported by the base station device as a radio resource usable for terminal-to-terminal communication, and transmits resource information for designating the assigned radio resource to a first terminal device and a second terminal device.

Radio control device, terminal device, and communication method

In a wireless communication system which can share the same frequency band with time division duplexing (TDD) and frequency division duplexing (FDD), a wireless terminal carries out an FDD downlink reception in a second frequency band overlapping a first frequency band allocated to TDD, thus carrying out reception at the TDD downlink reception timing. Alternatively, a wireless terminal carries out a TDD downlink reception in a second frequency band overlapping a first frequency band allocated to FDD, thus carrying out reception at the FDD downlink reception timing.

Wireless communication system and wireless communication method

A coil componentincludes a thin-film coil layer including spiral conductors and bump electrodestoformed on a surface of the thin-film coil layer. The thin-film coil layer includes internal terminal electrodestoconnected respectively to corresponding one ends of the spiral conductors, and a fourth insulating layercovering the internal terminal electrodetoand having openings ha to hd. Both a top surface TS and a side surface SS of each of the internal terminal electrodestoare exposed through the corresponding opening. The bump electrodestoare each brought into contact with both the top surface TS and side surface SS of each of the internal terminal electrodestoin the corresponding opening.

Electronic component and manufacturing method thereof

A first alignment mark is given to a substrate, and a second alignment mark is given to a mask. The mask forms an electronic circuit pattern on the substrate. A control unit performs alignment of the mask and the substrate based on the first and second alignment marks. The second alignment mark is formed to surround the first alignment mark. The second alignment mark has a step pattern therein.

Manufacturing apparatus of electronic component and manufacturing method thereof

An electronic component includes a first conductor layer including a first conductor pattern P, a first insulating layer covering the first conductor layer, a first opening hpassing through the first insulting layer to expose top and side surfaces of the first conductor pattern Ptherethrough, and a second conductor layer formed on the first insulating layer and including a second conductor pattern Pconnected to the first conductor pattern Pthrough the first opening h. A first opening region which is a planar region inside the first opening hincludes a first region in which the first conductor pattern Pis formed and a second region in which the first conductor pattern Pis not formed. The second conductor pattern Pis embedded in both the first and second regions of the first opening h

A zoom lens for a projection display device includes, in order from the enlarging side, a first lens group having negative refractive power and that is stationary during zooming, second and third lens groups having positive refractive power, a fourth lens group that has refractive power that is much weaker in absolute value than the refractive powers of the other lens groups, and a fifth lens group having positive refractive power and that is stationary during zooming. The second, third, and fourth lens groups move with coordinated movements continuously toward the enlarging side during zooming from the wide-angle end to the telephoto end of the zoom range. The zoom lens satisfies certain conditions related to focal lengths of the zoom lens and lens groups and distances along the optical axis. A projection display device uses the zoom lens.

Zoom lens and projection display device using the zoom lens

A large numerical aperture objective lens is disclosed having three lens groups. In order from the object side, these lens groups include: a first lens group of positive refractive power that is formed of two positive lens elements and an achromatic set of paired lens elements formed of a lens element of negative refractive power and a lens element of positive refractive power, respectively; a second lens group of negative refractive power; and a third lens group of positive refractive power, with the surface of the third lens group nearest the object side being convex. Specified conditions are satisfied in order to provide a compact, large numerical aperture objective lens having its aberrations favorably corrected as well as to correct for shifts of focus caused by expansion/contraction of the lens barrel with changes in temperature. The objective lens of the invention is particularly suitable for use in a night vision optical device having a photoelectron amplifier tube and an eyepiece, wherein aberrations in the eyepiece are balanced by aberrations of the objective lens.

Large numerical aperture objective lens and night vision optical device using the same

A mobile communication system includes a plurality of antennas for sending and receiving beams, a plurality of mobile terminals moving in a fixed direction substantially, and a zone-shift control unit for treating the moving mobile terminals locating within a predetermined area as a single moving zone and for controlling the antennas and directions of the beams so that the beams always cover the moving zone.

Mobile communication system with zone-shift control apparatus

In an optical system for an oblique incidence interferometer, first and second prisms are used for luminous flux dividing and for luminous flux combining, respectively. Reference light and measurement light are separated from each other at a surface where collimated coherent light enters or exits from the first prism, whereas the reference light and measurement light are combined together at a surface where the measurement light enters or exits from the second prism.

Optical system for oblique incidence interferometer and apparatus using the same

In an interferometer optical system comprising a reference standard having an entrance surface on which a luminous flux from a light source is incident and a reference plane on which the luminous flux entering from the entrance surface is obliquely incident, an angle within the range of 10&deg; to 30&deg; is formed between the entrance surface and reference plane of the reference standard.

A bright wide-angle infrared lens, suitable for a wavelength band of 8 to 12 &mgr;m, having favorable imaging performances comprises, successively from the object side, a first lens L made of a positive meniscus lens having a convex surface directed onto the object side and an image-side surface formed aspheric, a second lens L made of a negative meniscus lens having a convex surface directed onto the object side, and a third lens L having a positive refracting power with a convex surface directed onto the object side.

Bright wide-angle infrared lens

Growing community of inventors

Tokyo, Japan

Fumio Watanabe