Asahi Glass Company, Limited

Toshiba Mitsubishi-electric Industrial Systems Corporation

Fuji Jukogyo Kabushiki Kaisha

Kenji Oda

Kenichiro Omote

Naoki Sugimoto

Akira Takada

Masanobu Ogawa

Osamu Yanagisawa

Koji Miura

Yoshio Takegawa

Hideyo Osada

Haruo Aizawa

Shinichi Watanabe

Yusuke Takei

Kenichi Ishii

Takashi Yamashita

Ryo Nakajima

Kensuke Sakai

Mitsuo Takabatake

Toshihiko Saitou

Masaharu Kume

Shinya Shibata

Michio Ono

Teruhiko Yajima

Toshihiko Saito

Hijiri Ichihara

Katsuhiko Fukuma

A power conversion apparatus is provided to prevent the arc flash generated in a board from flowing out to a operation surface for operating the board, and also to relieve the pressure inside the board to the outside from the flapper section provided on the ceiling. The power conversion apparatus that has taken measures against an arc flash composed of a power converter and a board accommodating the power converter is provided. A BUS which constitutes the power converter has the first processing that makes it hard to fly the flash in a place where arc flash is not desired to occur. A door is placed on the front board that can be opened and closed by the operator. The board has an explosion-proof shutter part to prevent the arc flash from being released to the outside by the pressure inside the board, and has a flapper section for releasing the pressure inside the board to the outside from the ceiling of the board unit, when the arc flash occurs.

Housing for power conversion apparatus

Flapper for the roof of a power conditioning subsytem

Power converter

A three-level power conversion apparatus can suppress fluctuation in a neutral point voltage even when operated as a reactive power regulator. The three-level power conversion apparatus is composed of first and second three-level converters connected to an AC power supply, positive side and negative side DC capacitors, a three-level inverter to drive an AC motor, and converter control unit for controlling the three-level converters. The converter control unit has first and second reactive current controllers for controlling so that reactive portions of input currents of each three-level converter become a prescribed reactive current reference, first and second neutral point voltage fluctuation suppressing units for controlling a PWM controller, to make a voltage difference of two DC capacitors zero, and an active current controller for supplying a prescribed circulating active current from one three-level converter to other three-level converter.

Three-level power conversion apparatus

In the electrode tip dressing apparatus, the upper surface and the lower surface of a dressing body is covered with an upper chip capturing case and a lower chip capturing case so that the chips generated when electrode tips are dressed by polishing or grinding are prevented from scattering to the outside, whereby a chip collection efficiency can be increased.

Electrode tip dressing apparatus

Glass raw material is fed to a glass furnace to prepare molten glass. At least one metal compound from one of the following metals: aluminum, titanium, silicon, zinc, magnesium, iron, chromium, cobalt, cerium or calcium is supplied to a foam layer formed on the molten glass to diminish or extinguish the foam layer.

Method for melting glass

A glass composition comprising from 45 to 66 wt % of SiO.sub.2, from 0 to 15 wt % of Al.sub.2 O.sub.3, from 10 to 24 wt % of Li.sub.2 O+Na.sub.2 O+K.sub.2 O, from 14 to 26 wt % of CaO+MgO+SrO+BaO+ZnO, and from 0 to 1 wt % of SO.sub.3 +Sb.sub.2 O.sub.3, said glass composition containing substantially no zirconia and having a strain point of at least 560.degree. C. and a linear thermal expansion coefficient of at least 80.times.10.sup.-7 /.degree.C. within a temperature range of from 50.degree. to 350.degree. C.

Glass composition and substrate for plasma display

An antenna device for an automobile comprises an electric heating type defogger having heating strips and a bus bar for feeding a current to the heating strips and an antenna conductor having antenna strips arranged to form a pattern, which are fitted on the rear window glass fitted to a rear window opening formed in an automobile, wherein the defogger and the antenna conductor are spaced apart from each other with a predetermined small space in a capacitive coupling relation so a reactance circuit is connected to the defogger to effect anti-resonance between the defogger and the rear window opening of the body of the automobile at the central frequency in terms of logarithmic scale of a broadcast frequency band region; a quality factor value is determined by the inductance of a choke coil in the reactance circuit and the stray capacitance between the defogger and the rear window opening of the body of the automobile so that the ratio of an input impedance to a receiver to the impedance of the antenna conductor viewed from the side of a power feeding terminal becomes 1; and a matching circuit is inserted between the power feeding terminal of the antenna conductor and the receiver so that the sum of the impedance of the antenna conductor viewed from the side of the input terminal of the receiver and the functional part as an antenna in the rear window glass exhibits a little capacitive reactance in a broadcast frequency band region.

Antenna device for an automobile

A glass antenna device for an automobile comprises a glass plate fitted to an opening for a window, an antenna conductor having a power feeding point arranged on the glass plate and a matching circuit electrically connected to the power feeding point.

Glass antenna device for an automobile

Growing community of inventors

Yokohama, Japan

Kenji Oda