摘要:
A dust core is prepared from an iron powder with a particle size of 75-200 .mu.m having added thereto 0.015-0.15 wt % of silica sol, 0.05-0.5 wt % of a silicone resin, and 10-50 wt % based on the silicone resin of an organic titanium compound. By subjecting the iron powder to a curing treatment at 50.degree.-250.degree. C., compacting the powder, and annealing in an inert atmosphere at 550.degree.-650.degree. C., there is obtained a dust core consisting essentially of iron powder particles with a particle size of 75-200 .mu.m, 0.03-0.1% by weight of Si, 15-210 ppm of Ti, and 300-2,500 ppm of oxygen.
摘要:
A ferromagnetic powder composition for dust cores contains a ferromagnetic metal powder and 0.1-15% by volume based on the powder of titania sol and/or zirconia sol. The composition is pressure molded and desirably annealed into a dust core which exhibits a high magnetic flux density, low coercivity, low loss and high mechanical strength.
摘要:
An ultracompact, highly reliable mechanical type motion switch is provided which can be used for long periods of time even in severe environments such as in a high-temperature state. A motion switch has a bottomed cylindrical metallic case and a lower cover which is pressed fitted and secured in the metallic case. Two leads are penetratingly provided in the lower cover, each lead being supported and fixed in the lower cover and electrically insulated from the lower cover by a hermetic seal. Each lead extends from the lower cover toward a side of an innermost wall up to a predetermined position spaced apart from the innermost wall. A metallic ball is disposed between the innermost wall and each detecting end at a distal end of each lead so as to be movable therebetween. A coil spring having a proximal end secured to the lower cover is disposed inside the metallic case so as to surround the two leads. A distal end portion of the coil spring resiliently presses the metallic ball toward the inner wall side by its resilient force.
摘要:
A ceramic dielectric composition is provided which consists essentially of bismuth titanate with substituents, expressed by the formula:Bi.sub.4-x Me.sub.x Ti.sub.3-y R.sub.y O.sub.12where R is at least one divalent metal selected from strontium, barium and lead, Me is at least one pentavalent metal selected from tantalum, niobium and antimony, and both x and y are numbers falling within the range of 0.4 to 2.0 and the ratio of x/y is within the range of 0.9 to 1.1. This composition may contain specified metal oxide additives. The ceremic dielectric composition is sintered at a relatively low temperature, and exhibits a dielectric constant having a reduced dependence upon temperature variations over a wide use range, a reduced dielectric loss, enhanced resistivity and breakdown voltage.
摘要:
There is provided a mechanical motion switch whose structure is simple, which is a microminiature, which can be used for a long time even in a such a severe environment as a high temperature state, and whose reliability is high. A ceramic-made pedestal of an approximately rectangular shape is fixed to a board and, in the pedestal, there is formed a reverse L-letter shape groove continuous with a base end face and an upside face. A high elasticity wire having an electrical conductivity is fitted and fixed to the groove while being bent, and has a lead penetrating through the board and an arm part extended in a direction horizontal to the board, and a tip part of the arm part is made an action end. In the action end, there is formed, in a position separated from the board, a metal-made deadweight movable by a swing by an elasticity of the arm part. On the board just below the deadweight, there is provided a contact having the electrical conductivity, which is support-fixed to the board by a lead. And, the pedestal, the arm part, the deadweight and the contact are covered by a case.
摘要:
A plating method of a negative electrode can of a flat alkaline cell and a plating apparatus thereof are provided, by which a plated-coating layer can be formed only in a concave of the negative electrode can, a plating liquid is not uselessly consumed, and an inner face of the negative-electrode-can can be washed with a small amount of washing liquid. An electroless plating liquid is filled into the concave of the negative electrode can so as to form a plated-coating layer on an inner face of the concave. The electroless plating liquid is recovered from the concave of the negative electrode can, then a washing liquid is filled into the concave to wash the inner face of the concave. Then, the washing liquid is recovered from the concave of the negative electrode can, and then air is filled into the concave to dry the inner face of the concave.
摘要:
A flat alkaline primary battery is provided. The annular end portion of the negative electrode can is engaged with the annular end portion of the positive electrode can so that the positive electrode can and the negative electrode can are connected via a gasket to create an enclosed space inside the cans. The enclosed space accommodates a separator, a positive electrode mixture having a positive electrode active material as a main component, and a negative electrode mixture having a negative electrode active material as a main component. Then the enclosed space is filled with an alkaline electrolyte. The positive electrode active material is oxy nickel hydroxide. The negative electrode active material is a zinc or zinc alloy powder. The mass of the oxy nickel hydroxide is 3.3 times or more and 3.8 times or less times greater than the mass of the zinc or the zinc alloy.
摘要:
An object of the invention is to provide a flat alkaline primary battery that is inexpensive and has excellent battery capacity and capacity retention. A flat alkaline primary battery has a positive electrode can and a negative electrode can. The negative electrode can is fitted, from its opening side equipped with a gasket, into an opening of the positive electrode can. The opening of the positive electrode can is caulked against the gasket and thus sealed, thereby creating an enclosed space between the positive electrode can and the negative electrode can. The enclosed space has disposed therein a positive electrode mixture, a separator, and a negative electrode mixture. With the separator in between, the positive electrode mixture is placed on the positive electrode can side, and the negative electrode mixture is placed on the negative electrode can side. The enclosed space is filled with an alkaline electrolyte. Zinc or zinc alloy powder is used as a negative electrode active material, and nickel oxyhydroxide is used as a positive electrode active material. The negative electrode mixture at least contains, as active material stabilizers, a highly cross-linked polyacrylic acid, a non-cross-linked polyacrylic acid, and carboxymethylcellulose.
摘要:
A tire information transmitter is mounted in a tire cavity region surrounded by a tire inner circumference surface and a wheel wall surface and senses atmospheric information in the tire cavity region to wirelessly transmit to outside the tire cavity region. The transmitter has a sensor for sensing atmospheric information in the tire cavity region, a circuit board having a processing circuit for processing a sensed signal from the sensor and having a transmitting circuit for wirelessly transmitting a processed signal and a battery for supplying power for driving the circuits. The battery is made as an encapsulated body of a thin plate shape, having a thin plate surface, by encapsulating battery components with an insulation film, and the encapsulated body has an area ratio of the thin plate surface to a thickness of the thin plate shape of not less than 200 mm, and a mass of not more than 5 g. A tire information acquiring system has the transmitter and a receiver for receiving a signal from the transmitter.
摘要:
A method for decomposing cellulose to be contained in a cellulose raw material is provided. A pulverized cellulose based biomass is enclosed in a pressure closed vessel, and a sodium hydroxide aqueous solution having a concentration of 5%, pure water and 5 g of nickel oxyhydroxide obtained by solid-solving therein at least one kind of zinc, aluminum, magnesium, calcium, manganese, cobalt, copper and tin relative to nickel are added to prepare a catalytic reaction solution. Next, the catalytic reaction solution for decomposing cellulose by using nickel oxyhydroxide as a catalyst is subjected to a decomposition reaction of cellulose while stirring by using a stirring blade and heating at a temperature rising rate of 5° C./min. The reaction is carried out under autogenous pressure (saturated vapor pressure of water) in the reactor. After the temperature of the catalytic reaction solution has reached a prescribed temperature, the resulting catalytic reaction solution is heated for one hour and then cooled to room temperature at a rate of about 3° C./min.