Voice coil motor, lens moving device, and imaging apparatus
AssigneeFUJIFILM Corporation
InventorYuichi KAWANABE
Life of this patent
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Abstract
A yoke of a voice coil motor includes an outer yoke as a magnet holding portion and an inner yoke as a coil insertion portion. A magnet is fixed to the surface of the outer yoke facing the inner yoke. The inner yoke is inserted into a coil. The coil is formed in a trapezoidal shape where an outer wire length as a wire length of an outer long side is shorter than an inner wire length as a wire length of an inner long side. Since the outer long side is made shorter than the inner long side, an opposite thrust caused by current flowing in the outer long side can be reduced. Accordingly, a reduction in the thrust of the coil is suppressed by as much as the reduced opposite thrust.
Claims6
A voice coil motor comprising:
- a yoke that includes a magnet holding portion and a coil insertion portion formed in parallel with the magnet holding portion with a gap therebetween;
- a magnet that is fixed to a surface of the magnet holding portion facing the coil insertion portion;
- and
- a coil into which the coil insertion portion is inserted and which is moved along the coil insertion portion by the application of current and is formed in a trapezoidal shape where an outer wire length as a wire length of a portion of the coil opposite to the magnet is shorter than an inner wire length as a wire length of a portion of the coil facing the magnet.
Dependencies are inferred from the claim text.