Abstract: A semiconductor device, which can prevent an element breakdown by alleviating of electric field concentrations, and can also prevent reduction of gain is provided. It includes: a source electrode (21) formed on a semiconductor layer (12); a drain electrode (23) formed on the semiconductor layer (12); a gate electrode (22) formed between the source electrode (21) and the drain electrode (23); an insulating film (24) formed on the semiconductor layer (12) and the gate electrode (22); a field plate electrode (25) formed on the insulating film (24); and a resistor (26) for connecting the field plate electrode (25) and the source electrode (21).

Abstract: A pneumatic tire having a transponder therein comprises a pair of sidewall portions and a crown portion toroidally arranged between a pair of bead cores, and a method of reading and writing of the transponder buried in the tire, wherein the transponder is buried in a projected portion at the inner surface of a bead portion of the tire, and the axial direction of the transponder is along the circumferential direction of the tire, and a rod antenna used for receiving and transmission for the transponder is moved as an axial line of the rod antenna along the circumferential direction of the tire when the reading and writing is done from outside of the tire.

Abstract: A method and an apparatus for fitting bead portions of the tire onto a wheel substantially uniformly and at the same time for filling inner pressure into the tire. A wheel cap-shaped jig in the form of a disc is arranged on the side surface of the wheel. The periphery of the wheel cap-shaped jig progressively reduces outwardly in the rotating axial direction of the wheel. The tire is then obliquely arranged on the wheel through the wheel cap-shaped jig, and the bead portions are radially outwardly expanded along their circumferences so as to assemble onto the rim. An outer cylindrical member having an inclined annular end surface and an inner cylindrical member telescopically arranged in the outer cylindrical member are brought into air-tight contact with the rim and a side surface of the tire, respectively.

Abstract: A method for assembling a tire on the rim of a wheel and filling inner pressure in the tire. The wheel is fixed on a wheel table in an airtight manner to the table. The tire is arranged on the wheel and a pawl is moved along the circumference of the wheel or the wheel on the table is rotated to arrange the bead portions of the tire around the rim of the wheel. An outer cylinder member is brought into abutment against one of the bead portions to urge it toward the other bead portion and pressurized air is filled into the tire through a clearance between the wheel and the one bead portion of the tire to bring the bead portions into close contact with the rim of the wheel. Thereafter, pressurized air is further filled in the tire through the inflation valve of the wheel to maintain the inner pressure higher than the normal inner pressure and then the inner pressure is lowered to the normal inner pressure.

Abstract: A method and an apparatus for fitting bead portions of the tire onto a wheel substantially uniformly and at the same time for filling inner pressure into the tire. A wheel cap-shaped jig in the form of a disc is arranged on the side surface of the wheel. The periphery of the wheel cap-shaped jig progressively reduces outwardly in the rotating axial direction of the wheel. The tire is then obliquely arranged on the wheel through the wheel cap-shaped jig, and the bead portions are radially outwardly expanded along their circumferences so as to assemble onto the rim. An outer cylindrical member having an inclined annular end surface and an inner cylindrical member telescopically arranged in the outer cylindrical member are brought into air-tight contact with the rim and a side surface of the tire, respectively.

Abstract: A method for assembling a tire on a wheel without causing any detrimental deformation of bead portions of the tire. The tire is obliquely arranged on a wheel cap-shaped jig provided on the upper side surface of the wheel located on a flat surface to arrange the lower part of the lower bead portion loosely around the wheel. The lower part of the tire is inwardly urged, while the other part of the lower bead portion is radially outwardly expanded to arrange it along its circumference around the wheel, progressively. Moreover, the part of the upper bead portion is radially outwardly expanded and is urged downward toward the support surface to arrange it loosely around the wheel. The part of the tire corresponding to the part of the upper bead portion is inwardly urged, while the remaining part of the upper bead portion is radially outwardly expanded and is urged downward toward the support surface along the circumference of the upper bead portion to arrange it around the wheel, progressively.

Abstract: The magnitude of an amount of correction of unbalance at each axially opposite end face of the rim-fitted tire and the position on a circumference of each of the rim end faces are measured by means of an unbalance measuring machine for simultaneously measuring an amount of correction of static unbalance and an amount of correction of dynamic unbalance. The magnitude of the amount of correction of static unbalance, the position of an amount of correction of static unbalance on a rim periphery for minimizing a magnitude of an amount of correction of residual dynamic unbalance, the magnitude of the amount of correction of residual dynamic unbalance, and the position of the amount of correction of residual dynamic unbalance on the circumference of each of the rim end faces are calculated on the basis of the magnitude of the amount of correction of unbalance and the position of the amount of correction of unbalance on the circumference of each of the rim end faces measured.

Abstract: A noise reducing apparatus comprising a first passageway group consisting of a plurality of first passageways aligned in parallel with each other for forming a first flat wave A by sound waves having a first same phase passed through each first passageway from a sound source, and a second passageway group consisting of a plurality of second passageways aligned in parallel with each other for forming a second flat wave B by sound waves being a second same phase passed through each second passageway from the sound source, said first passageway group having positioned above said second passageway group, and the phase of said first flat wave being advanced by a phase difference of 240.degree..+-.60.degree. with respect to the phase of said second flat wave to thereby reduce noise emitted from the sound source by interference of the first and second flat waves A and B.

Abstract: A noise reducing device for printers including a noise reducing hollow body consisting of at least one hollow duct at one side of a sheet delivery opening opposedly arranged to a printed sheet guiding-receiving member positioned at the other side of the sheet delivery opening, and the hollow duct is oriented such that a noise outlet thereof is opened towards the upper surface of the sheet guiding-receiving member.

Abstract: A noise reducing apparatus is disclosed, comprising a lens-type hollow body consisting of a plurality of inclined hollow tubular passages. The lens-type hollow body has a plane incident surface and a curved emission surface and the length L.sub.2 of the hollow tubular passage is optimized in accordance with relevant dimensional parameters of setting of the lens-type hollow body in a sound field, to reduce noise from a spot sound source efficiently.

Abstract: A noise reducing apparatus in the form of a hollow body comprising two or more passage groups consisting of a plurality of passages. The length of each passage is determined such that the sound waves emitted from the passages of the adjacent passage groups form plane waves which are shifted by a half wavelength so that plane waves interfere each other. The apparatus can be secured to an opening of construction and reduce the level of sound pressure from a sound source without any closed shield construction surrounding the sound source.

Abstract: In a microwave mixer circuit, two diodes connected in series are formed in a semi-insulating semiconductor substrate. A power distributing circuit is connected across the series circuit of the diodes. One of the connecting points is connected to a first signal terminal. A line connecting the two diodes in series is connected to the second signal input terminal and through a low-pass filter element to an intermediate frequency output terminal.

Abstract: In a method and an apparatus for detecting a sound source, a measurement plane to be observed is automatically scanned in two-dimensional manner by means of two microphones which are spaced apart from each other by a given distance and are moved by a traversing device. Outputs of these microphones are sampled for successive measurement regions and then are processed by processing circuit including a fast Fourier transform to derive acoustic intensities with respect to various frequencies in a given frequency range. Then, a distribution of the acoustic intensities is indicated on a display device by using various indication techniques. Therefore, since the measurement is effected by using the acoustic intensity representing both a sound power and a propagating direction, the analysis of the sound source can be performed in an easy and accurate manner, and an entier apparatus can be small in size and inexpensive in cost.