Rotary actuator and input device using the same
First Claim
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1. A rotary actuator comprising:
- a roller having a center axis, the roller having a first center shaft protruding along the center axis;
a first bearing surrounding the first center shaft for supporting the first center shaft of the roller to allow the roller to rotate about the center axis;
a first ring magnet fixed to the first center shaft of the roller, the first ring magnet being alternately magnetized to an S-pole and an N-pole with predetermined angular intervals;
a first elastic member provided between the first center shaft of the roller and the first bearing, the first elastic member having a ring shape which surrounds the first center shaft and which has a first inner circumferential surface and a first outer circumferential surface opposite to the first inner circumferential surface; and
a first fixed magnet facing the first ring magnet,wherein the first inner circumferential surface of the first elastic member elastically contacts the first center shaft to urge the first center shaft toward the center axis, andwherein the first outer circumferential surface of the first elastic member elastically contacts the first bearing to urge the first bearing away from the center axis.
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Abstract
A rotary actuator includes a roller having a center shaft protruding along a center axis, a bearing for supporting the center shaft of the roller to allow the roller to rotate about the center axis, a ring magnet fixed to the center shaft of the roller, an elastic member having a ring shape provided between the center shaft of the roller and the bearing, and a fixed magnet facing the ring magnet. The ring magnet is alternately magnetized to an S-pole and an N-pole with predetermined angular intervals. This rotary actuator has a simple structure and operates with a preferable operation feeling.
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Citations
20 Claims
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1. A rotary actuator comprising:
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a roller having a center axis, the roller having a first center shaft protruding along the center axis; a first bearing surrounding the first center shaft for supporting the first center shaft of the roller to allow the roller to rotate about the center axis; a first ring magnet fixed to the first center shaft of the roller, the first ring magnet being alternately magnetized to an S-pole and an N-pole with predetermined angular intervals; a first elastic member provided between the first center shaft of the roller and the first bearing, the first elastic member having a ring shape which surrounds the first center shaft and which has a first inner circumferential surface and a first outer circumferential surface opposite to the first inner circumferential surface; and a first fixed magnet facing the first ring magnet, wherein the first inner circumferential surface of the first elastic member elastically contacts the first center shaft to urge the first center shaft toward the center axis, and wherein the first outer circumferential surface of the first elastic member elastically contacts the first bearing to urge the first bearing away from the center axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An input device comprising:
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a roller having a center axis, the roller having a first center shaft protruding along the center axis; a first bearing surrounding the first center shaft for supporting the first center shaft of the roller to allow the roller to rotate about the center axis; a first ring magnet fixed to the first center shaft of the roller, the first ring magnet being alternately magnetized to an S-pole and an N-pole with predetermined angular intervals; a first elastic member provided between the first center shaft of the roller and the first bearing, the first elastic member having a ring shape which surrounds the first center shaft and which has a first inner circumferential surface and a first outer circumferential surface opposite to the first inner circumferential surface; a first fixed magnet facing the first ring magnet, and a magnetic detector facing the first ring magnet, wherein the first inner circumferential surface of the first elastic member elastically contacts the first center shaft to urge the first center shaft toward the center axis, and wherein the first outer circumferential surface of the first elastic member elastically contacts the first bearing to urge the first bearing away from the center axis. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification