Abstract: There is disclosed a thinner-layered radio wave absorber having high absorption performance for a high frequency electromagnetic wave. The radio wave absorber, even when having a magnetic layer of not more than 1 mm in thickness, achieves satisfactory absorption characteristics for the high frequency electromagnetic wave by adopting a structure that a conductor is fixedly attached to a face opposite to an electromagnetic-wave incident face of the magnetic layer of single-layered structure, and also arranging the magnetic layer to have values of a real part &mgr;′ and an imaginary part &mgr;″ of complex relative magnetic permeability of the magnetic layer satisfying an expression of &mgr;″≧m&mgr;′−n (m: real number of m>0, n: real number of n≧0) outside an impedance mismatching region.

Abstract: A resin component for encapsulating a semiconductor includes magnetic powder and silica powder whose average particle diameter is smaller than the average particle diameter of the magnetic powder. Thus, the curing body of the resin component for encapsulating a semiconductor has an electromagnetic wave shielding function by the magnetic powder. Since the spaces of the magnetic powder are filled with the silica powder whose average particle diameter is small, the moldability of the curing body is improved and the insulating characteristics thereof are enhanced. Such a resin component for encapsulating a semiconductor is employed, there can be produced a preferably formed and encapsulated semiconductor device having the electromagnetic wave shielding function and having no malfunction generated due to leakage current from a semiconductor element.

Abstract: A semiconductor element is mounted on a wiring circuit board in which a circuit has been formed. This semiconductor element is resin-encapsulated with a first encapsulating resin layer.

Abstract: A magnetic powder 4 is produced by use of a plating mold M which is pattern-formed with an electrode range 10 corresponding to the shape of a magnetic powder 4 and an insulative range surrounding the periphery of the electrode range, precipitating films 40 of the magnetic material selectively in the electrode range through an electroplating and then peeling the films 40 from the plating mold. The flat magnetic powders 4 where are regular in plane shapes and diameters among or between powders or where average crystal grain diameters are 100 nm or smaller, are much dispersed into an insulative resin as a bonding agent.

Abstract: An antenna apparatus and a portable communication apparatus are disclosed to reduce the quantity of electromagnetic waves absorbed by a human body in a portable communication apparatus even in case of any wireless communication frequency corresponding to at least two or more wireless communication systems different in wireless communication frequency, respectively. A dielectric 13 having the frequency dispersibility that varies relative dielectric constant with wireless communication frequencies can equate an electrical length L2 from one end to the other end of a conductive flat plate 11 at two or more types of wireless communication frequencies. This makes it possible to make an impedance at an open end of a single conductive flat plate 11 almost equivalent for any wireless communication frequencies to suppress the surface current, and thus the quantity of electromagnetic waves absorbed by a human body to be reduced.

Abstract: A radio wave absorbent capable of absorbing radiowaves in the space saving and efficient manner and capable of coping with up to high frequency bands, as well as a manufacturing method thereof are provided. In a radio wave absorbent in which magnetic particles comprising a soft magnetic metal material are mixed with a matrix of a polymeric material or ceramics, the magnetic particles are formed into elliptic plate particles.

Abstract: The method for manufacturing alloy powder for R—Fe—B type rare earth magnets of the present invention includes a first pulverization step of coarsely pulverizing a material alloy for rare earth magnets and a second pulverization step of finely pulverizing the material alloy. In the first pulverization step, the material alloy is pulverized by a hydrogen pulverization method. In the second pulverization step, easily oxidized super-fine powder (particle size: 1.0 &mgr;m or less) is removed to adjust the particle quantity of the super-fine powder to 10% or less of the particle quantity of the entire powder.

Abstract: An electromagnetic wave suppressor sheet formed into a sheet-like shape out of a material made of synthetic resin in which powder of conjugated magnetic particles surface-treated with an insulating inorganic material has been dispersed.

Abstract: The method for manufacturing alloy powder for R—Fe—B type rare earth magnets of the present invention includes a first pulverization step of coarsely pulverizing a material alloy for rare earth magnets and a second pulverization step of finely pulverizing the material alloy. In the first pulverization step, the material alloy is pulverized by a hydrogen pulverization method. In the second pulverization step, easily oxidized super-fine powder (particle size: 1.0 &mgr;m or less) is removed to adjust the particle quantity of the super-fine powder to 10% or less of the particle quantity of the entire powder.

Abstract: A milling apparatus comprises a mill for milling of an object material such as a rare-earth alloy. The mill includes a mill main body. A classifying rotor for classification of a powder is provided inside and at an upper portion of the mill main body. The mill main body has an outer circumference provided with three leg portions spaced equally from each other. Each of the leg portions supports the mill main body at a position above the center of gravity of the mill. Each of the leg portions is provided with a weight detector for detection of a weight of the mill holding the object material remaining in the mill. A flexible pipe is provided between the mill and a raw material feeder for supply of the object material to the mill. Another flexible pipe is provided between the mill and a collecting tank for collection of the powder.

Abstract: A sheet for electronic parts which includes an electromagnetic wave-absorbing heat-radiating layer containing a magnetic material powder, for example, a ferrite, Sendust or the like, a heat-conductive powder, for example, alumina, aluminum nitride or the like and a resin, and a shield layer which is an electrically conductive layer including a metallic foil, for example, copper foil, aluminum foil or the like, or including an electrically conductive powder of carbon or the like and a resin, laminated on the electromagnetic wave-absorbing heat-radiating layer, and a method of producing the same.

Abstract: A milling apparatus comprises a mill for milling of an object material such as a rare-earth alloy. The mill includes a mill main body. A classifying rotor for classification of a powder is provided inside and at an upper portion of the mill main body. The mill main body has an outer circumference provided with three leg portions spaced equally from each other. Each of the leg portions supports the mill main body at a position above the center of gravity of the mill. Each of the leg portions is provided with a weight detector for detection of a weight of the mill holding the object material remaining in the mill. A flexible pipe is provided between the mill and a raw material feeder for supply of the object material to the mill. Another flexible pipe is provided between the mill and a collecting tank for collection of the powder.

Abstract: A case according to the present invention is used in a sintering process to produce a rare-earth magnet. The case includes: a body with an opening; a door for opening or closing the opening of the body; and supporting rods for horizontally sliding a sintering plate, on which green compacts of rare-earth magnetic alloy powder are placed. The supporting rods are secured inside the body. At least the body and the door are made of molybdenum.

Abstract: The portable telephone capable of more effectively reducing the electromagnetic energy to be radiated therefrom and absorbed by the human body during its use is provided.

Abstract: An electromagnetic wave absorber including a mixture comprising a magnetic material particle and a binding material. The magnetic material includes a nucleus of an organic material and a magnetic material film is formed on a surface of the nucleus.

Abstract: A mixing apparatus comprises a mixing container having an opening. The mixing container is hollow cylindrical, having a length l.5˜2.5 times an inner diameter. The mixing container is loaded with a powder such as a metallurgical powder to 30 % ˜80% of the capacity of the mixing container. The mixing container is tilted at 10 degrees ˜40 degrees off the horizontal level and rotated while a liquid such as a lubricant is supplied to the powder in the mixing container from a nozzle portion. The nozzle portion is constituted to prevent the liquid from discharging when the supply of the liquid is not needed. After the liquid is supplied, the nozzle portion is evacuated from the mixing container while the mixing container is rocked for mixing the powder with the liquid. Thereafter, the mixing container is tilted to position the opening at a downward location, and the mixing container is given rotation and impact while unloading a mix from within the mixing container.

Abstract: A case according to the present invention is used in a sintering process to produce a rare-earth magnet. The case includes: a body with an opening; a door for opening or closing the opening of the body; and supporting rods for horizontally sliding a sintering plate, on which green compacts of rare-earth magnetic alloy powder are placed. The supporting rods are secured inside the body. At least the body and the door are made of molybdenum.

Abstract: A hydrogen pulverizer according to the present invention is an apparatus for subjecting a rare-earth alloy magnetic material to a hydrogen pulverization process. The apparatus includes: a hermetically sealable hydrogen furnace, which includes a furnace body with an opening and a cap for closing the opening; a loading chamber for temporarily enclosing the rare-earth alloy magnetic material when the rare-earth alloy magnetic material, which has been pulverized with hydrogen, is unloaded from the furnace body through the opening; and an inert gas supply for supplying an inert gas into the loading chamber.

Abstract: A suspension application apparatus for applying a suspension containing powder particles of an oxide dispersed in a liquid to a plate for magnet sintering, the oxide having a specific gravity greater than the liquid. The apparatus includes: a container for storing the suspension; a stirrer for stirring the suspension stored in the container; a transport path through which the suspension is transported from the container to the plate; and a homogenizer for homogenizing the suspension by applying a mechanical force to at least part of the suspension flowing through the transport path.

Abstract: The method for manufacturing alloy powder for R—Fe—B type rare earth magnets of the present invention includes a first pulverization step of coarsely pulverizing a material alloy for rare earth magnets and a second pulverization step of finely pulverizing the material alloy. In the first pulverization step, the material alloy is pulverized by a hydrogen pulverization method. In the second pulverization step, easily oxidized super-fine powder (particle size: 1.0 &mgr;m or less) is removed to adjust the particle quantity of the super-fine powder to 10% or less of the particle quantity of the entire powder.