Hitachi, Ltd.

Hitachi Metals, Ltd.

Hisashi Ando

Ko Soeno

Tetsuro Minemura

Hiroshi Sakamoto

Akira Misumi

Ryuji Watanabe

Isao Ikuta

Hiroshi Fukushima

Seiki Shimizu

Yukio Kurosawa

Toshio Doi

Yoshiaki Kita

Tomio Iizuka

Kiyoshi Konno

Testuo Oyama

Toshiki Kaneko

Tetsuo Ito

Toshiyuki Aida

Takao Kawamura

Keiichi Kuniya

Shigehiko Yamamoto

Masaichi Nagai

Yoshihito Maeda

Kiyoji Iwashita

Akira Okayama

Akira Wada

Atsuya Kamada

Mituo Nakamura

Tetsuo Oyama

Hisasuke Takeuchi

Ruyji Watanabe

Yosimi Katou

The present invention discloses a connector comprising: an insulating substrate having a plurality of through-holes and having a desired first circuit pattern formed on the substrate; female contactors each being formed and fixed around the edge of the through-hole and having an opening, an edge of which extends inwardly of the through-hole, said female contactors being electrically connected to said first pattern; and a male contactor comprising an insulating substrate having a desired second circuit pattern thereon and a plurality of male contactor pins fixed to the substrate and electrically connected to said second pattern, said pins each being located in a position corresponding to each of the openings of said female contactors, wherein said female contactors are made of a thin film of a shape memory alloy and the edge of each of the female contactors is given, before inserting each of the male contactor pins, such a shape memory that the contactor is returned to a position to close the opening when said contactor is subjected to a temperature above the martensitic transition temperature.

Service temperature connector and packaging structure of semiconductor

An electrode of a vacuum circuit breaker includes a support electrode, an auxiliary support electrode of Co soldered to the support electrode, and an electric contact portion composed of a sintered porous body of Co sintered to the auxiliary support electrode and a conductive alloy impregnating the sintered porous body. The auxiliary support electrode has a protrusion formed with a flange at its end portion. The auxiliary support electrode thus prepared acts to provide a barrier to a solder during the soldering operation, to increase the joining width between the electrical contact portion and the electrode, and to prevent the characteristics of that alloy from being degraded by the soldering operation.

Vacuum circuit breaker

An alloy having variable spectral reflectance having a composition which essentially consists of Ag, 30 to 46 wt % of Zn and 0.1 to 15 wt % in total of at least one element selected from elements of groups Ia, IIa, Iva, Va, VIa, VIIa, VIII, Ib to Vb and rare earth elements, the alloy being able to have different crystal structures, one of which is obtained when it is held in solid state at a first temperature above the room temperature, another of which is obtained when the same is held in the solid state at a second temperture lower than said first temperature. Disclosed also is an information recording medium made of the alloy. The alloy exhibits a reversible change in color or spectral reflectance as a result of change between two crystal phases, so that the information recording medium produced from this alloy can be used effectively as the medium for recording, regeneration and erasion of the informations.

Alloy having variable spectral reflectance and information recording

A recording material made of an alloy capable of exhibiting different spectral reflectances at an equal temperature, depending on a heating-cooling cycle to which the alloy is subjected. The alloy can possess in solid state different crystal structures at a first temperature higher than the room temperature and at a second temperature lower than the first temperature but not lower than the room temperature. A part of the surface of the alloy exhibits, as a result of being quenched from the first temperature, a crystal structure which is different from the crystal structure at the second temperature, while the other part possesses the crystal structure at the second temperature, so that these two parts exhibit different spectral reflectances. Using this recording medium, it is possible to record, reproduce and erase information by means of, for example, laser beams.

Recording material

In an information recording medium having a recording layer for recording information by heating through incoming energy, at least one of an interference layer and an absorption layer for the incoming energy is provided on the energy-incoming side of the recording layer to reduce the reflected energy from the information recording medium and increase the quantity of heat input into the recording layer. The temperature of the recording layer is rapidly enhanced, and rapid writing is made possible thereby. Writing or erasing can be made with less incoming energy, and thus the writing sensitivity or erasing sensitivity of the information recording medium can be increased.

Information recording medium

A fuel cell electrode having a structure wherein at least one catalytic active component selected from noble metals belonging to the groups I and VIII in the periodic table is carried on surfaces and among lamellar crystalline layers of a donor-type graphite intercalation compound, is effective for improving cell performance when used in a fuel cell.

Fuel cell electrode, process for producing the same and fuel cell using

A small-sized, light weighted vacuum circuit interrupter is provided. The interrupter comprises a vacuum container confining a vacuum atmosphere of a pressure less than 10.sup.-5 mmHg and a pair of electrodes at least one of which is a movable electrode for making and breaking an electric circuit including either a transformer of a rated surge voltage strength of less than 45 kV or a motor of a rated surge voltage strength of less than 25 kV. At least one of the electrodes has a contact made of a porous body of a refractory conductive material and an impregnate selected from the group consisting of silver telluride, silver selenide and mixtures thereof impregnated in the porous body in an amount sufficient to give the interrupter a chopping current of not more than 1A and an arc extinguishing capability at 1MHz of not more than 27 A/.mu.s when measured in a circuit of 6 kV. The interrupter can be connected to the load without a surge absorber for protecting the breaker from a surge voltage generated at the time of interrupting the circuit.

Surge-absorberless vacuum circuit interrupter

Disclosed is a vacuum switch having a container and a pair of contact electrodes, and a method of manufacturing the same, in which at least one of the contact electrodes is constituted by a member made up of a skeleton containing cobalt as its principal component with pores into which a copper alloy containing copper as its principal component, silver, and a low melting point and high vapor pressure element having substantially no or very low solid-solubility with respect to the copper at a room temperature is impregnated.

Vacuum switch and method of manufacturing the same

A directly heated cathode for electron tube having a stable electron emission characteristic is provided. The cathode comprises a base metal of Ni-W alloy consisting essentially of 20-30% by weight of tungsten, the balance being nickel and incidental impurities, said alloy being free from a reducing agent, and a layer of thermoelectron emission oxides laid directly and baked onto the flat part at the front side of the base metal. The layer of thermoelectron emission oxides is in direct contact with the flat part of the base metal.

Directly heated cathode for electron tube

A directly heated cathode for an electron tube comprising a base plate made of an alloy containing 20 to 30% by weight of W, 0.12 to 0.28% by weight of Zr and the remainder being Ni and an electron emissive oxide layer disposed directly on the base plate shows good and stable electron emission properties and when it is installed in a television picture tube, the picture tube shows excellent initial properties.

A directly heated cathode for electron tube having a stable electron emission characteristic and a low cut-off voltage is provided. The cathode comprises a base metal of an alloy consisting essentially of 20-30% by weight of tungsten and a trace amount to 0.25% by weight of zirconium, the balance being nickel, binder dots of metallic nickel powders distributed on a flat part at the front side of the base metal, and a layer of thermoelectron emission oxides laid on the flat part at the front side of the base metal. The layer of thermoelectron emission oxides is in direct contact with the flat part through clearances among the binder dots of the metallic nickel powders.

The present cathode for cathode ray tube of directly heating type is characterized by comprising a cathode substrate body having two leg pieces extended in the same direction and a flat part connected to one end of each leg piece, prepared by shaping a flat metal plate of nickel- or cobalt-based alloy, a bonding layer having an uneven surface prepared by diffusion bonding by heating a powder layer comprising powders of alloy or mixture of nickel and cobalt formed on the flat part, to which a thermionic emission layer is to be bonded, and the thermionic emission layer, and has a very small deformation when used and a longer life. A cathode with much less deformation and much longer life can be obtained by using a cathode substrate body prepared from a flat metal plate provided with a thinner metal layer of at least one of nickel and cobalt on its surface than the flat metal plate by diffusion bonding. A cathode with much less deformation after the service for a long period and much longer life is obtained by using a cathode substrate body prepared from a flat metal plate provided with a metal layer of at least one of nickel and cobalt having a smaller thickness on its surface than that of the flat metal plate by diffusion bonding, and then applying a plastic working to the flat metal plate to a desired thickness.

Cathode for cathode ray tube of directly heating type and process for

In a process for producing a cathode for a cathode ray tube of directly heating type, which comprises shaping a heat-resistant and electro-conductive, flat metal plate, into a cathode substrate body having two leg pieces extended in the same direction and a flat part connected to one end of each leg piece, forming a heat-diffusible metal powder layer having a good affinity to said flat metal plate and on an outer surface of said flat part, heating the powder layer, thereby diffusion bonding the powder layer to the flat part and forming a bonding layer having an uneven surface, to which a thermionic emission layer is to be bonded, and forming the thermionic emission layer on the surface of the bonding layer, the process is characterized by forming on said flat metal plate a metal layer having a good affinity to the flat metal plate, by diffusion bonding, thereby forming a compound plate, and shaping the resulting compound plate into the shape of said cathode substrate body. A cathode having less thermal deformation and a longer life can be produced thereby. Furthermore, the process is characterized by applying a plastic working to the compound plate to a desired thickness and shaping the resulting compound plate into the shape of the cathode substrate body, and a cathode having much less thermal deformation and much longer life can be produced thereby.

Process for producing cathode for cathode ray tube of directly heating

This invention relates to an apparatus for production of metal powders of a low oxygen content, which are preferred as raw material powders for sintered bodies of a high toughness, according to the water atomizing method. More specifically, when a molten metal is sprayed in a limited space with use of a liquid crystal medium and cooled promptly, a metal powder results of a good moldability which has an oxygen content corresponding to 1/2 or less of the oxygen contents of metal powders prepared by conventional apparatuses and which is excellent in the size uniformity.

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Hitachi, Japan

Hisashi Ando