| US 7,583,080 B2 | ||
| Rotation angle detection device and rotation angle correction method | ||
| Kiyotaka Uehira, Osaka (Japan); Kouji Oike, Kyoto (Japan); Noritaka Ichinomiya, Nara (Japan); Kiyotaka Sasanouchi, Osaka (Japan); and Kouichi Santo, Osaka (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Appl. No. 11/813,713 PCT Filed Feb. 09, 2006, PCT No. PCT/JP2006/302228 § 371(c)(1), (2), (4) Date Jul. 11, 2007, PCT Pub. No. WO2006/085569, PCT Pub. Date Aug. 17, 2006. |
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| Claims priority of application No. 2005-034025 (JP), filed on Feb. 10, 2005; application No. 2005-052809 (JP), filed on Feb. 28, 2005; and application No. 2006-004519 (JP), filed on Jan. 12, 2006. | ||
| Prior Publication US 2009/0021246 A1, Jan. 22, 2009 | ||
| Int. Cl. G01B 7/30 (2006.01) | ||
| U.S. Cl. 324—207.25 [324/207.12; 324/207.21] | 26 Claims |
| 1. A rotation angle detection device, comprising:
a multi-rotatable first rotor holding a first target connected to an input axis and having an outer circumferential surface
to which magnetic poles of alternate polarities are magnetized at an identical interval;
a first detector for detecting a rotation angle of the first rotor, which is disposed facing the magnetic pole of the first
target;
a second rotor coupled to the input axis and having a gear;
a third rotor coupled to the gear of the second rotor and having a gear provided with a second target in a center portion;
a second detector for detecting a rotation angle of the third rotor;
a fourth rotor coupled to the gear of the third rotor and having a gear provided with a third target in a center portion;
and
a third detector for detecting a rotation angle of the fourth rotor.
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