Abstract: A speaker in which the inner peripheral face of a ring-shaped soft ferrite core is cemented to a cylindrical projection extending from a lower portion of a bowl-shaped frame. An outer peripheral surface of a co-axially disposed ring-shaped bond magnet is fitted into a recess of the frame. Two magnetic gaps are formed between facing surfaces of the ring-shaped bond magnet and the ring-shaped soft ferrite core. Two voice coils are mounted on a cylindrical bobbin and suspended from a vibratory diaphragm such that the voice coils are inserted into the magnetic gaps.

Abstract: The weft winder for a weaving machine has (a) a non-magnetic, hollow-cylindrical outer frame member having an inner conical surface at one end thereof; (b) a rotor disposed rotatably and concentrically with the outer frame member, which is only rotatable; (c) a non-magnetic, inner frame member rotatably supported by the rotor and having an outer conical surface facing the inner conical surface of the outer frame member via a gap therebetween; (d) a pipe projecting from an outer end of the rotor and extending in the gap for guiding a weft; and (e) a plurality of magnet members each constituted by a plate-shaped magnet and a yoke and fixed to the inner conical surface and the outer conical surface, respectively, such that N poles and S poles of the magnets are circumferentially arranged alternately and that different magnetic poles of the magnet members are opposing each other via the gap.

Abstract: The magnet article for attracting foreign matters in the stomach is constituted by (a) a hollow cylindrical case made of a corrosion-resistant, non-magnetic material: (b) a plurality of disc-shaped yokes made of a soft magnetic material; (c) a plurality of disc-shaped magnet members made of an R-Fe-B permanent magnet material and having magnetic poles on both end surfaces, the disc-shaped magnet members being arranged alternately with the disc-shaped yokes in the hollow cylindrical case such that the magnetic poles having the same polarity of the adjacent disc-shaped magnet members face each other via each disc-shaped yoke; and (d) a pair of end covers made of a corrosion-resistant, non-magnetic material, each end cover being fixed to each end of the hollow cylindrical case so that the inside of the hollow cylindrical case is sealed.

Abstract: A convergence device for electron beams in a color picture tube includes a pair of four-pole magnet rings, a pair of six-pole magnet rings and a pair of two-pole magnet rings, the absolute value of the temperature coefficient of magnetization of which is equal to or less than 0.05%/.degree. C. measured in a temperature range of 0.degree. C. to 120.degree. C.

Abstract: A magnetic circuit for a loudspeaker characterized in a substantially rectangular parellelepiped yoke provided with a hollow penetrating two opposed lateral faces thereof has a substantially rectangular parallelepiped sintered magnet mounted therein of a specified size and composition and having a recoil permeance coefficient from 1.0 to 1.2, a polepiece connected to the top surface of said parallelepiped sintered magnet forms a magnetic air gap with the end of a through hole formed in the top face of said rectangular yoke for a movable coil.