Abstract: A reduced-size magnetic coupling device includes a first magnet group having a plurality of first magnets arranged on an interaction surface at equal intervals in the direction of the circumference about the rotation axis; a second magnet group having a plurality of second magnets arranged on an interaction surface at equal intervals in the direction of the circumference about the rotation axis and in positions in the vicinity of the rotation axis; and a third magnet group having a plurality of third magnets that are arranged at equal intervals in the circumferential direction about the rotation axis and in positions outward with respect to the second magnets. The third magnets have an area approximately equal to that of the second magnets. Each third magnet has a magnetic pole different from that of the second magnet that is positioned between the third magnet and the rotation axis.

Abstract: To reduce running cost while preventing production of noise. Provided are a pair of magnetic meshing rings (151) including magnetic meshing teeth (151b) arranged side by side on both an inner circumferential surface and an outer circumferential surface of a middle yoke member (15); a magnet member (152) situated between the pair of the magnetic meshing rings (151) such that the magnetic meshing teeth on one of the magnetic meshing rings (151) and magnetic meshing teeth on the other one of the magnetic meshing rings (151) have opposite magnetic poles; and a pair of meshing tooth rows (25) including a plurality of meshing teeth (25a) arranged side by side on an outer circumferential surface of an inner yoke member (21) and on an inner circumferential surface of an outer yoke member (22) and facing the magnetic meshing rings (151), the meshing tooth rows (25) being disposed at portions where the meshing tooth rows (25) face the inner and outer circumferential surfaces of the middle yoke member (15).

Abstract: A reduced-size magnetic coupling device includes a first magnet group having a plurality of first magnets arranged on an interaction surface at equal intervals in the direction of the circumference about the rotation axis; a second magnet group having a plurality of second magnets arranged on an interaction surface at equal intervals in the direction of the circumference about the rotation axis and in positions in the vicinity of the rotation axis; and a third magnet group having a plurality of third magnets that are arranged at equal intervals in the circumferential direction about the rotation axis and in positions outward with respect to the second magnets. The third magnets have an area approximately equal to that of the second magnets. Each third magnet has a magnetic pole different from that of the second magnet that is positioned between the third magnet and the rotation axis.

Abstract: Two substrates carrying printed circuit patterns are coupled together back-to-back with an adhesive tape interposed therebetween. A plurality of holes are formed through the substrates, and apertures of small diameter are punched in the portions of the adhesive tape backing these holes. Electric components to be held to the substrate are then inserted through the holes punched in the adhesive tape and soldered firmly into portion by an automatic soldering apparatus.