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A magnetic circuit includes a multi-pole magnet mounted on a predetermined surface of a yoke and having magnetic poles formed in a direction perpendicular to the predetermined surface of the yoke. The multi-pole magnet is separated into two pieces, and a single-pole magnet is interposed between the

A magnetic circuit includes a multi-pole magnet mounted on a predetermined surface of a yoke and having magnetic poles formed in a direction perpendicular to the predetermined surface of the yoke. The multi-pole magnet is separated into two pieces, and a single-pole magnet is interposed between the two pieces of the multi-pole magnet. Magnetic poles of the single-pole magnet are formed in a direction different from the direction in which those of the multi-pole magnet are formed.

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1. A magnetic circuit comprising:a yoke having a face; a multi-pole magnet mounted on said face of said yoke and separated into a first piece and a second piece, said first piece having a first magnetic pole of a first polarity on a face of said first piece remote from said yoke and said second piec

1. A magnetic circuit comprising:a yoke having a face; a multi-pole magnet mounted on said face of said yoke and separated into a first piece and a second piece, said first piece having a first magnetic pole of a first polarity on a face of said first piece remote from said yoke and said second piece having a second magnetic pole of a second polarity on a face of said second piece remote from said yoke; and a single-pole magnet interposed between said first piece and said second piece of said multi-pole magnet, said single-pole magnet having a third magnetic pole of one of the first polarity and the second polarity on a first face of said single-pole magnet adjacent to said first piece of said multi-pole magnet and a fourth magnetic pole of one of the first polarity and the second polarity, said fourth magnetic pole having a different polarity than said third magnetic pole, on a second face of said single-pole magnet adjacent to said second piece of said multi-pole magnet, wherein said face of said first piece of said multi-pole magnet and said face of said second piece of said multi-pole magnet extend in a direction generally perpendicular to a direction in which said first face of said single-pole magnet and said second face of said single-pole magnet extend.