Hitachi, Ltd.

Yoshiyuki Kubota

Atsushi Miki

Yukio Kurosawa

Hiroyuki Sugawara

Kouji Sasaki

Yukio Kawakubo

Satoshi Ogura

Norihira Uozumi

Yasuyuki Tsutsumi

Koji Amakawa

A novel gas laser apparatus is disclosed, which comprises a hermetic container with a gas laser medium sealed therein, a plurality of main discharge electrodes arranged in the hermetic container for causing the main discharge in the gas laser medium thereby to generate a laser beam, and a device for subjecting the discharge space between the main discharge electrodes to preionization over a wide range thereof before the main discharge by use of a reflected laser beam or an ultraviolet ray lamp.

High-pressure gas laser apparatus and method of laser processing

An electrolyte-type fuel cell, i.e., a fuel cell using a liquid electrolyte, which comprises at least one unit cell comprising a matrix for retaining a liquid electrolyte and a pair of gas diffusible electrodes each having a gas flow passage and provided at both sides of the matrix and in direct contact with the matrix, and a pair of gas supply-discharge means for supplying and discharging a necessary gas to and from the gas passages of the corresponding gas-diffusible electrodes of the unit cell, at least one of the gas passages of the gas-diffusible electrodes being communicated with the matrix through at least one liquid electrolyte passage, at least one demister being provided in the gas flow passage and on the liquid electrolyte passage exposed in the gas flow passage, and a means for generating electrolyte mists being provided at the supplying side of at least one of the gas supply-discharge means can supply a liquid electrolyte to the matrix with a high trapping efficiency of liquid electrolyte mists.

Fuel cell using liquid electrolyte

A vacuum interrupter with pressure monitoring means wherein a pair of separable electrodes are arranged within a highly evacuated envelope and are connected to a high voltage circuit provided with a vacuum pressure detector element which has a pair of detector electrodes insulated from each other and serving to detect the pressure of the vacuum within the evacuated envelope. The vacuum pressure detector element has a voltage applied thereto in such a manner that one of the detector electrodes is conductively connected to the one end of the evacuated envelope to which the high voltage circuit is connected and the other detector electrode is connected to ground potential through a series connection member consisting of different sorts of voltage allotment elements which are selected from a resistance, an inductance, and a capacitor and whose voltage allotment ratio varies in dependence on frequency. A vacuum pressure detector means detects the operation of the vacuum pressure detector element.

Vacuum interrupter with pressure monitoring means

Growing community of inventors

Hitachi, Japan

Yoshiyuki Kubota