Hitachi, Ltd.

Shikoku Electric Power Co., Inc.

Sasaki Glass Co., Ltd.

Shigeo Shiono

Katuo Sugawara

Etsunori Mori

Hideo Tsukioka

Seiichi Sakai

Toshihiko Gange

Jun Ozawa

Takeshi Takahashi

Ikuro Masuda

Hideaki Sasaki

Shinichi Kazui

Fumihiro Endo

Yasuro Hori

Hiroyuki Sugawara

Toshio Ishikawa

Seizo Nakano

Terunori Warabisako

Takeo Yuminaka

Kazuo Mera

Toshiharu Shirakura

Hitoshi Odashima

Kiyoshi Okumura

Takeshi Kawana

Minoru Suzuki

Yuzuru Kamata

Minoru Fujimoto

Masaki Murashita

Hisayoshi Shiraishi

Hiroo Ohkawa

Hirofumi Seki

Osamu Isshiki

Hiroshi Itoh

Seiichiro Ogawa

Jinichi Sakurai

Ichitaro Tani

Ictitaro Tani

Takao Minakawa

Junichi Nishihashi

Humio Shibata

Kazuhiko Nishimura

Hirofumi Shirakata

An electron beam gas processing apparatus includes a single vacuum vessel maintained at vacuum by means of a vacuum pump and first and second lenses are disposed in the vacuum vessel. An electron beam emitted from an electron source is focused by each of the lenses, and the electron beam is irradiated onto a processing gas in a duct. When the current value of the electron beam is increased as the concentration of NOx in the processing gas increases, the focal distance is decreased by increasing the intensity of magnetic fields or the intensity of electric fields of the lenses in accordance with the current value of a filament, the current value of an arc power supply and the gas pressure in a gas reservoir and the first lens is moved toward a draw-out electrode and the second lens is moved toward the duct, so that a parallel electron beam of constant diameter is formed and the electron beam can be prevented from being increased in focusing diameter.

Apparatus for processing gas by electron beam

A laser marking system of the present invention is provided with an irradiation position changing device on a laser beam path for changing the irradiation positions of the laser beam corresponding to each marking area when a marking area including a plurality of irradiation marking areas is formed by irradiating the workpiece with the pulse laser beam which has passed a pattern of a mask. The plurality of irradiation marking areas are successively irradiated with the pulse laser beam from an irradiation position to form a marking area. Since the marking area larger than each irradiation marking area can be obtained, the whole laser marking system can be made smaller in size without increasing the output power of the pulse laser generator.

Laser marking system

In a gas laser device according to this invention, a gas inlet having an electrode protrudes within each of expanded portions protruding on the side, where the gas inlet is disposed, of the principal portion of the discharge tube. Gas medium ejected from the gas inlet in the principal portion of a discharge tube collides with the inner surface of the principal portion of a discharge tube, while forming a flame extending along the ejected gas medium from the electrode and is divided into two partial flows. One of them flows along the wall of the expanded portion; collides with the gas inlet; and is divided further into two partial flows. Therefore it does not collide with the gas medium within the gas inlet. Consequently the gas medium and the flame fluctuate hardly and are stabilized. In this way it is possible to stabilize the laser output.

Gas laser device

In a laser beam glass cutting method, a glass article to be cut (for example a moulded tumbler having a moil) is maintained at a high temperature below the softening point of the glass and then the glass is repeatedly irradiated with a laser beam along the required cut-off line by rotating the glass. During this step, a tensile force is applied by gravity or by a mechanical device to the part to be cut off. Following removal of the part, the edge of the glass is irradiated again with the laser beam to effect fire-polishing thereof, so as to improve the shape of that edge. During the irradiation by the laser beam, an auxiliary inert gas is blown into the glass article to prevent glass deposition.

Laser beam glass cutting

An apparatus for connecting wiring patterns on a wiring board and leads of a parts to be mounted on the wiring board, via the solder provided between the leads and the patterns. The parts-connecting apparatus enables, especially, circuit elements of a high degree of, to be connected automatically with high reliability and accuracy by using solder through the steps of setting the wiring board in a predetermined position while pressing a surface thereof so as to remove the warp from the wiring board, fastening the leads of the part to the wiring patterns by a magnet provided on the lower surface of the wiring board, and heating the solder provided on the portions of the leads which are fastened to the wiring patterns.

Parts-connecting apparatus using solder

Method and apparatus for diagnosing abnormality of an oil-filled electric apparatus is disclosed. Presence or absence of abnormality is determined by comparing contents of plural predetermined components contained in gas extracted from the oil of the electric apparatus with respective predetermined reference values. The type of abnormality is determined on the basis of at least one set of two specific components selected from the plural components.

Method and apparatus for diagnosing oil-filled electric apparatus

In an apparatus for detecting gas components in the oil in an oil-filled device, which comprises a gas-storing chamber being provided at an oil-filled device containing an insulating oil through a gas-permeating material capable of separating gas components from the insulating oil, a gas calibration tube being provided at the gas-storing chamber through a switch valve, and a gas chromatographic device connected to the gas calibration tube through the switch valve, any influence of gas components in a subatmospheric pressure is eliminated and exact concentrations of gas components are detected by providing at least one stirring mixer having at least one throttle perforation in a carrier gas passage for supplying the gas components from the gas calibration tube to the gas chromatographic device at the upstream side of a gas separation column of the gas chromatographic device, or by proving a circulation passage between the gas-storing chamber and the gas calibration tube, a valve capable of being exposed to the atmosphere at the circulation passage, and a gas circulation unit at the circulation passage for circulating the gas in the circulation passage.

Method and apparatus for detecting gas components in oil in oil-filled

Disclosed is a signal transmitting and receiving apparatus for transmitting and receiving parallel-by-word data signals, converting the parallel-by-word data signal to serial-by-word data signal, and transmitting the serial-by-word data signal to control units connected in a multi-drop connection configuration or receiving the signals transmitted from the control units. An external control mode and an internal control mode in receiving the parallel-by-word data signal, a simulation mode, and the prevention of competing status between a write timing of the parallel-by-word data to a buffer memory and a read timing of the data for converting it to serial-by-word data are described.

Signal transmitting and receiving apparatus

A photo-coupler for electricity-light-electricity conversion comprising:

Photocoupling device

A light source for forming an optical path extending across a closed vessel and a light receiving unit for receiving light from the light source are disposed outside the closed vessel. A portion to have its temperature measured as lies in the closed vessel is provided with a temperature detecting device which consists of a temperature sensor and a light interceptive plate. The temperature sensor is formed to be downwardly convex by sticking two members of different coefficients of thermal expansion one over the other (the member of the larger coefficient of thermal expansion being arranged over the member of the smaller coefficient of thermal expansion). The light interceptive plate is arranged over the member of the larger coefficient of thermal expansion. When the portion to have its temperature measured has reached a predetermined temperature, the temperature sensor inverts the downwardly convex state into an upwardly convex state. Owing to the inversion of the state of the temperature sensor, the light interceptive plate is turned into the optical path extending across the closed vessel, from outside the same and intercepts part of the light from the light source. Thus, the quantity of the light to be received by the light receiving unit changes, and the temperature of the portion is measured through a light quantity--temperature conversion.

Temperature measurement apparatus

In an enclosed-type switching device having at least a pair of electric contacts, a method for checking the contacts without visual inspection wherein with the contacts closed, the resistance value between outer terminals connected to the contacts is measured and compared with a reference resistance value, so that the result of comparison is used to determine the degree of damage of the contacts. Also disclosed is an auxiliary apparatus for use with an enclosed-type switching device to facilitate application of the above-mentioned method, especially when the switching device is equipped with a plurality of parallel-connected sequentially closed or opened contact pairs. The auxiliary apparatus is arranged to interrupt the sequential operation of the contact pairs so that the resistance is measured during the interruption of the operation.

Method for checking electric contacts of an enclosed-type switching

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Hitachi, Japan

Shigeo Shiono