Rotation angle detection device for a rotatable body

Details Rotation angle detection device for a rotatable body Rotation angle detection device for a rotatable body

2007-05-08

2007-05-08

Lefkowitz, Edward (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

Reexamination Certificate

active

10869908

ABSTRACT:
A rotation angle detection device capable of easy selection of detection gears is provided to detect a rotation angle of a main gear. The device includes first and second detection gears each rotatable in conjunction with the main gear, a first magnetic sensor for detecting a rotation angle of the first detection gear, a second magnetic sensor for detecting a rotation angle of the second detection gear, and a microcomputer for detecting the rotation angle of the main gear on the basis of the rotation angle detected by the first magnetic sensor and the rotation angle detected by the second magnetic sensor. The periodicity from the first magnetic sensor and the periodicity of the second magnetic sensor are set to be prime to each other. Further, the teeth number of the first magnetic sensor is set to be a numeric value obtained by multiplying the periodicity of the first magnetic sensor by a predetermined integral number. As well, the teeth number of the second magnetic sensor is set to be a numeric value obtained by multiplying the periodicity of the second magnetic sensor by a predetermined integral number.

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The American Heritage College Dictionary, 4th Edition, 2002, p. 414.
Office Action Mailed Aug. 30, 2005 in corresponding Japanese Application No. 2003-290662.

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