Rolling driving actuator and power toothbrush using the same
First Claim
1. A rolling driving actuator comprising:
- a moving object having a shaft pivoted to be able to rotate around an axis thereof, a yoke fixed on the shaft and flat plate shaped permanent magnets attached to adjoin the yoke around the axis of the shaft and magnetized in thickness direction thereof; and
a tubular shaped stator having a coil wound around the axis of the shaft to enclose the moving object, and stationary yokes made of a magnetic material and disposed to face an outermost peripheral portion of the yoke and the permanent magnet with a predetermined clearance in a direction perpendicular to the axis of the shaft; and
whereineach permanent magnet is fixed on the yoke in the same orientation so that all outer faces of the permanent magnets have the same polarity; and
the moving object being driven in rolling driving in a predetermined angle region around the axis of the shaft by supplying alternating current to the coil.
2 Assignments
0 Petitions
Accused Products
Abstract
In a rolling driving actuator used as a drive source of a power toothbrush, permanent magnets are formed flat plate shape, and constituting a moving object by being attached to grooves formed on an outer peripheral face of a yoke which is press-fitted to and fixed on a shaft. On the other hand, a tubular shaped stator, which is constituted by a coil wound around a bobbin and stationary yokes provided on both side of the bobbin in axial direction of the shaft, is provided to face an outer face of the permanent magnet or an outer face of the yoke of the moving object with a predetermined clearance so that a center axis thereof becomes coaxial with the center axis of the shaft. By supplying an alternating current to the coil, the moving object is driven in rolling driving around the axis of the shaft.
20 Citations
16 Claims
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1. A rolling driving actuator comprising:
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a moving object having a shaft pivoted to be able to rotate around an axis thereof, a yoke fixed on the shaft and flat plate shaped permanent magnets attached to adjoin the yoke around the axis of the shaft and magnetized in thickness direction thereof; and a tubular shaped stator having a coil wound around the axis of the shaft to enclose the moving object, and stationary yokes made of a magnetic material and disposed to face an outermost peripheral portion of the yoke and the permanent magnet with a predetermined clearance in a direction perpendicular to the axis of the shaft; and
whereineach permanent magnet is fixed on the yoke in the same orientation so that all outer faces of the permanent magnets have the same polarity; and the moving object being driven in rolling driving in a predetermined angle region around the axis of the shaft by supplying alternating current to the coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. In a power toothbrush comprising:
- a brush body that brush is implanted at a front end thereof;
a rolling driving actuator for rolling driving the brush body in a predetermined direction;
an electric power supply for supplying electric power to the rolling driving actuator; and
a driving circuit for supplying driving current to the rolling driving actuator;
characterized by thatthe rolling driving actuator comprises; a moving object having a shaft pivoted to be able to rotate around an axis thereof, a yoke fixed on the shaft and flat plate shaped permanent magnets attached to adjoin the yoke around the axis of the shaft and magnetized in thickness direction thereof; and a tubular shaped stator having a coil wound around the axis of the shaft to enclose the moving object, and stationary yokes made of a magnetic material and disposed to face an outermost peripheral portion of the yoke and the permanent magnet with a predetermined clearance in a direction perpendicular to the axis of the shaft; and
whereineach permanent magnet is fixed on the yoke in the same orientation so that all outer faces of the permanent magnets have the same polarity; and the moving object is driven in rolling driving in a predetermined angle region around the axis of the shaft by supplying alternating current to the coil.
- a brush body that brush is implanted at a front end thereof;
Specification