Abstract: The invention relates to a dipole ring magnet for use in magnetron sputtering apparatus or magnetron etching apparatus to produce a uniform magnetic field. Essentially the dipole ring magnet is an assembly of a plurality of pillar-like, anisotropic magnet segments in a circumferential arrangement. Each of the pillar-like magnet segments is magnetized in a direction normal to its longitudinal axis, and in assembling the ring magnet the magnet segments are differently oriented such that a magnetic field in the direction of a diameter of the ring is produced inside the ring magnet. To improve the uniformity of the magnetic field, particularly in respect of a component normal to the longitudinal axis of the ring magnet, each pillar-like segment is devoid of a lengthwise middle part to provide a vacant space in place of the middle part, and the length of the vacant space is regulated according to the position of the segment in the ring magnet.

Abstract: The invention relates to a magnet apparatus for producing a uniform magnetic field for magnetic resonance imaging (MRI). The magnet apparatus is of the type having a pair of permanent magnet discs each of which has a hole in a central region and a yoke structure in which the magnet discs are held opposite to each other. For each magnet disc the yoke structure has an aperture which is in alignment with the hole in the magnet disc. As is usual, a pair of pole plates are attached to the opposite faces of the magnet discs, respectively, so as to produce a uniform magnetic field in a space between the two magnet discs. To ease visual observation of the object of imaging in the afore-mentioned space, such as the head part of a human body, the pole plate on each magnet disc is formed with a hole which is in alignment with the hole in the magnet disc. A video camera can be used. According to the need small pole pieces are attached to the surfaces of the holed pole plates to keep uniformity of the magnetic field.

Abstract: A lead acid storage battery comprising a battery container, a plate assembly assembled by stacking a negative electrode plate and a positive electrode plate one upon another through a separator interposed between the negative and positive electrode plates, and a saddle placed on the bottom surface of the battery container for absorbing the extension of the positive electrode plate. Legs of a negative electrode grid plate consisting of the negative electrode plate are larger in width than legs of a positive electrode grid plate consisting of the positive electrode plate.

Abstract: The invention relates to an apparatus for producing a magnetic field in a space between two oppositely arranged permanent magnet discs, which is suitable for use in magnetic resonance imaging (MRI). An object of the invention is to reduce the size and weight of the yoke connecting the two permanent magnet discs without causing magnetic saturation of the yoke in view of the fact that magnetic saturation of the yoke leads to the appearance of leakage flux and consequential lowering of the uniformity of the magnetic field. The object is accomplished by regulating the cross-sectional area of the whole magnetic path in the yoke, A.sub.y, such that the following equation holds: A.sub.y =1/a.times.A.sub.m B.sub.m /B.sub.ys, where A.sub.m is the cross-sectional area of magnetic path in each permanent magnet disc, B.sub.m is the magnetic flux density in each permanent magnet disc at normal temperature, B.sub.

Abstract: The invention relates to a cylindrical magnet apparatus for producing a uniform magnetic field in a predetermined direction within the cylindrical hole in the apparatus. The apparatus is suitable for use in NMR imaging. Essentially the apparatus is an assembly of a plurality of dipole ring magnets in a coaxially juxtaposed arrangement. Each ring magnet is constructed of a plurality of cross-sectionally trapezoidal segments which are arranged annularly, and each segment is an anisotropic magnet block magnetized in a suitable direction. To acquire a good balance between the material cost and the gross weight of the apparatus a selected portion of the assembly of dipole ring magnets is made of a rare earth alloy magnet, whereas the remaining portion is made of a ferrite magnet. In one embodiment of the invention, in each segment of each ring magnet an end part on the radially inner side of the ring magnet is made of a rare earth alloy magnet whereas the remaining part is made of a ferrite magnet.

Abstract: Two disc shaped permanent magnets are provided within a yoke structure in a manner to face one another. Two pole pieces are disposed on the surfaces of the two magnets respectively. Small spherical metallic members which induce a localized increase in magnetic field strength, are attached to the surfaces of the opposed pole pieces at selected locations in a manner which unifies the magnetic field produced.

Abstract: An apparatus for preventing or damping vibrations and noise in a vehicle, in which the vibration-transmitting characteristics of two or more mount units in an engine mounting member and/or a body mounting member of a vehicle are changed relatively, so that the vibrations or sounds produced due to vibrations which have been transmitted from an engine via mount units to a vehicle body may be off-set or mutually counteracted, thereby damping or preventing vibrations and noise in a vehicle body.