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: Disclosed is an electromagnetic wave shielding apparatus for shielding electromagnetic waves generated from a circuit so as to prevent the electromagnetic waves from being leaked to the outside of the circuit. The apparatus includes a metal member disposed in such a manner as to be opposed to the circuit, and an electromagnetic wave absorbing member disposed on the metal member, wherein the electromagnetic absorbing member is composed of a carbon layer and coil-like carbon fiber structures. The apparatus is allowed to simply obtain an electromagnetic wave absorbing function without increasing the weight of the apparatus.

Abstract: Disclosed is an electromagnetic wave shielding apparatus for shielding electromagnetic waves generated from a circuit so as to prevent the electromagnetic waves from being leaked to the outside of the circuit. The apparatus includes a metal member disposed in such a manner as to be opposed to the circuit, and an electromagnetic wave absorbing member disposed on the metal member, wherein the electromagnetic absorbing member is composed of a carbon layer and coil-like carbon fiber structures. The apparatus is allowed to simply obtain an electromagnetic wave absorbing function without increasing the weight of the apparatus.

Abstract: A portable telephone having an antenna for transmitting and/or receiving a wireless signal, a microphone for generating a sound signal corresponding to an input sound, a transmitting and receiving circuit for generating a wireless signal corresponding to the sound signal generated by the microphone to transmit the wireless signal through the antenna and generating a sound signal corresponding to the wireless signal received by the antenna, a receiver for outputting sound corresponding to the sound signal generated by the transmitting and receiving circuit, a shield case for surrounding and housing all or part of the transmitting and receiving circuit and being conductive, an electric wave absorber with one face in contact with a predetermined area of the shield case for absorbing an electric wave, and a conductive layer formed on another face of the electric wave absorber and electrically connected to the shield case.

Abstract: There is provided an electromagnetic wave absorber in which uniformity, reproducibility and productivity are raised by forming a metal soft magnetic material flat plate, the surface of which is smoothed, of a regular shape disk or elliptical shape easily, at low cost, stably and certainly. In the electromagnetic wave absorber composed of a mixture of a magnetic material particle 21 and an organic binding material, the magnetic material particle 21 is constituted by a nucleus 22 made of organic material and a magnetic material film 23 formed on its surface.

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: An ultrasonic-wave distance measuring apparatus of the separate transmission and reception type reflection system capable of making the measurable distance longer and improving the precision of the measuring, wherein a distance measurement calculation control circuit in an ultrasonic-wave transmitter starts counting a time simultaneously with the start of vibration of an ultrasonic-wave transmission sensor, the ultrasonic-wave emitted from the ultrasonic-wave transmission sensor is reflected at the object to be measured and detected by an ultrasonic-wave reception sensor, a distance measurement sensitivity correction circuit corrects the sensitivity of the signal from the ultrasonic-wave reception sensor based on sensitivity correction data predetermined in accordance with a type of object and a measurement distance, the signal after the sensitivity correction by the distance measurement sensitivity correction circuit is detected in a detection circuit, and the distance measurement calculation control circuit

Abstract: A data storage disk drive includes an optical head positioned in spaced relationship to the data storage disk by a holder for an objective lens and a piezoelectric body and a resilient body which are mounted on a surface of the holder which faces the data storage disk. An AC power supply applies an AC voltage to the piezoelectric body to produce a flexural standing wave that keeps the resilient body in quasi contact with the data storage disk for making substantially constant a gap between the optical head and the data storage disk.

Abstract: An improved process for producing maleic anhydride which comprises catalytically oxidizing benzene with a molecular oxygen-containing gas in the vapor phase in a multitubular heat-exchanger-type reactor. The process is characterized in thata catalyst-packed layer of the reactor is divided into a gas inlet side layer and a gas outlet side layer,the activity of the gas inlet side layer is controlled by adding at least one component selected from the group consisting of potassium, cesium, thallium and rubidium as a promoter or by decreasing the amount of phosphorus pentoxide (P.sub.2 O.sub.