| 摘要 |
A magnet rotor in which rotation prevention and positional displacement (rattling, and misalignment of axes) between a magnet and a rotor body can be restricted, a movable magnet type-instrument with the magnet rotor, and a stepping motor with the magnet rotor. In the magnet rotor, projections ( 11 ) and recesses ( 12 ) arranged with predetermined intervals and formed in a substantially rectangular shape are provided on the inner wall of a hollow section of an annular magnet ( 10 ). Rising side wall sections ( 11 A) defined by the projections ( 11 ) are radially directed with the position of the axis (G) of the magnet rotor (R) as the standard. In the rotor body ( 20 ), rotation prevention sections ( 21 ) for preventing relative rotation between the rotor body ( 20 ) and the annular magnet ( 10 ) are formed by placing a plastic material along the shapes of the projections ( 11 ) and the recesses ( 12 ).
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