Hitachi, Ltd.

Ebara Corporation

Hitachi Microcomputer System, Ltd.

Hitachi Video and Information System, Inc.

Soichiro Ogawa

Yoichi Nakamura

Seigo Kyo

Toshihiko Sano

Yasuo Kobayashi

Kenji Kawabata

Mamoru Fukushima

Takao Shimizu

Yoshio Watanabe

Kenichi Onda

Shigeo Mikoshiba

Takayuki Miyamoto

Hiroyuki Kawasaki

Kunio Seki

Tomokazu Shiga

Shinichi Shinada

Hiromitsu Matsuno

Motohiro Sugino

Ryuichi Ikeda

Hirotaka Mochizuki

Makoto Goto

Susumu Iijima

Akinori Murata

Dong Min Kim

Ryoichi Masaki

To eliminate accumulation of air while preventing a decrease in pump efficiency, a pump is provided. The pump includes a rotary shaft, an impeller that is attached to the rotary shaft and that rotates with rotation of the rotary shaft, a casing that surrounds the rotary shaft, a shaft sealing device that seals a gap between the casing and the rotary shaft, and a baffle plate part that is located between the impeller and the shaft sealing device and attached to a rotating body. The baffle plate part extends in a direction that is inclined or orthogonal with respect to a surface orthogonal to an axial direction of the rotary shaft.

Pump and rotary baffle plate

Pump casing

The present invention relates to a reinforcing structure for a casing accommodating an impeller. A double-suction centrifugal pump includes: a rotational shaft (); an impeller () secured to the rotational shaft (); a casing () that accommodates the impeller () therein; and legs () secured to the casing (). The casing () includes a suction volute () that communicates with a suction port (), the casing () includes an upper casing () and a lower casing () fastened to each other, at least one rib (A,B,C) is provided on each of both side surfaces of the lower casing () constituting the suction volute (), the rib (A,B,C) extends in a radial direction of the rotational shaft () when viewed from an axial direction of the rotational shaft (), and the rib (A,B,C) is separated from the legs ().

Double-suction centrifugal pump

A fluorescent lamp having a stem provided with first and second lead wires for energization of an electrode and an electrically-insulating member provided therein with a first hole and a second hole larger in cross-sectional area than said second lead wire. The first and second lead wires are inserted in the first and second holes of the electrically-insulating member, respectively, and an outer diameter of a glass envelope of the fluorescent lamp is not smaller than 13 mm and not larger than 29 mm.

Fluorescent lamp, method for manufacturing the same, and fluorescent lamp device

A high frequency operation fluorescent lamp which can reduce a possibility of over-heat damage of a flare stem at the end of its life. In the lamp, a pair of intermediate lead wires are passed through the flare stem at each end of a light emitting envelope, and an insulator is provided to cover a top of the flare stem.

In order to operate a discharge apparatus, a first voltage having a first frequency is applied to electrodes. Moreover, a second voltage having a second frequency higher than the first frequency is applied to the first voltage. The waveform of the voltage having the second frequency may be an attenuated one which is synchronized with the first frequency. As a result of this voltage superposition, the electrons, ions, or plasma in the already established discharge fluctuate with the change in the electric field. If the second frequency is selected to be equal or close to the resonance frequency of the electrons, ions, or plasma existing in the already established discharge, there occurs the resonance phenomenon of the electrons, ions, or plasma. This phenomenon raises the temperature of those particles. As a result, the electron temperature approaches to a value preferable for emission of visible light or ultraviolet rays so that the luminous efficiency is improved.

Driving method of discharge apparatus

An information processing apparatus employs a liquid crystal display and a fluorescent lamp for backlighting the screen of the liquid crystal display. A lighting circuit for supplying alternating current lighting power to the fluorescent lamp receives input power from either a commercial alternating current power source or from a direct current battery. The level of the lighting power supplied to the fluorescent lamp is determined based upon a determination of whether the input power is being supplied from the commercial power source or from the battery.

Information processing apparatus including a control circuit for

A lighting device for a hot cathode fluorescent lamp used for a back light of a liquid crystal display or the like attempts to prolong the life of a lamp in a lighting device for a low consumption wattage fluorescent lamp. More specifically, the hot cathode fluorescent lamp is started while being pre-heated, and even after starting, a pre-heat current keeps flowing. The pre-heat current value after starting is set to be smaller than that at the time of starting for the purpose of optimizing the hot spot temperature. With employment of the configuration as described above, the lifetime of the hot cathode fluorescent lamp when used as a back light can extend to 10,000 hours or more.

Lighting device for fluorescent lamp

A discharge lamp lighting system including at least one switch device connected between a d.c. power supply and a discharge lamp which is turned on by a high frequency power generated through turning-on and -off of the switching device. In the discharge lighting system, the discharge lamp lighting operation is allowed to start when the d.c. power supply voltage reaches a predetermined voltage value A or over, and the discharge lamp lighting operation is stopped when the d.c. power supply voltage lowers smaller than a predetermined voltage value B, where the values A and B take a relation that B is smaller than A.

Protected discharge lamp lighting system

In order to make the brightness approximately uniform over a diffusion board, a back-light device is provided with a light transmission controlling film having a planar form in a shape of a projection of the lamp on the diffusion board. The film is disposed in parallel to the lamp axis between the lamp and the diffusion board.

Back-light device

Disclosed is a fluorescent lamp arrangement for uniformly illuminating a display panel wherein a fluorescent lamp having a glass tube is provided with electrodes at opposite sides thereof, a fluorescent layer is formed over an inner surface of the glass tube, and mercury and a rare gas are sealed in the glass tube; and a light-shading patterned layer is formed along a surface of the glass tube so as to make luminance on a display panel substantially uniform when the fluorescent lamp and the display panel are parallelly disposed to a plane which includes a longitudinal axis of the glass tube.

Fluorescent lamp arrangement for uniformly illuminating a display panel

A back light device for uniformly illuminating a liquid crystal display plate comprises a fluorescent lamp having a luminous tube formed by being turned up through a coupling in the same plane, a liquid crystal display plate to be illuminated by the light radiated from the fluorescent lamp, a diffused plate interposed between the liquid crystal display plate and the fluorescent lamp in parallel to the plane, and a reflector for reflecting the light radiated from the fluorescent lamp toward the diffused plate.

Back light device for uniformly illuminating a liquid crystal display

A fluorescent lamp operating device having a power supply, a circuit for converting the output power from the power supply into a high-frequency power, a lighting circuit connected to a secondary side of a transformer of the high-frequency power converter circuit to light a fluorescent lamp, a circuit for preheating the filament of the fluorescent lamp, a switch circuit including diodes and at least one transistor connected in series with the fluorescent lamp in the lighting circuit, and a control circuit for turning off the transistor for a predetermined period when the power supply is turned on thereby turning off the lighting circuit to actuate the preheating circuit during this period. The control circuit turns on the transistor at the end of the predetermined period to thereby actuate the lighting circuit.

Fluorescent lamp operating device

A discharge lamp operating device having a high frequency inverter is discharged. Connected to a secondary winding of an oscillation transformer of the high frequency inverter is a discharge current supply circuit having a switch for controlling supply of a discharge current to dim a fluorescent lamp. An electrode heating circuit is connected to secondary windings of the transformer to continuously heat electrodes. An oscillation frequency of the inverter is controlled such that it increases as a dimming factor is high and decreases as the dimming factor is low. A capacitor is connected in series with a path of an electrode heating current in the electrode heating circuit so that the heating current is increased when the dimming factor is high and decreased when it is low by utilizing a frequency dependency of an impedance of the capacitor. As a result, an electrode temperature is kept at an optimum temperature in both start time and dimming time, and the start characteristic and a lifetime of the fluorescent lamp are significantly improved.

Growing community of inventors

Tokyo, Japan

Soichiro Ogawa