| 摘要 |
PROBLEM TO BE SOLVED: To provide a voice coil motor having high magnetic efficiency by preventing a radially magnetized magnet of an inner magnet array from protruding.SOLUTION: There is provided a voice coil motor 2 using a dual Halbach magnet array, axially magnetized magnets 6A, 6C and 6E of an inner magnet array 6 being a united ring-shaped magnet, and radially magnetized magnets 6B, 6D of the inner magnet array 6 consisting of a plurality of division magnets divided in a circumferential direction. The voice coil motor is provided with fixing means 13 of axially crimping and fixing the radially magnetized magnets and axially magnetized magnets of the inner magnet array. Annular recessed parts 60, 61 are formed on both side faces of the division magnets 6B, 6D, and a ring member 12 fitted in the recessed parts is arranged between the division magnets and axially magnetized magnets, and restricts the division magnets from moving in an outer peripheral direction of the division magnets.SELECTED DRAWING: Figure 2 |
