Patent ID: 7436174
Filing Date: 2008-10-14
Classification: B62D,G01D

Abstract:
1. A rotation angle detector comprising: a rotor configured to rotate in response to rotation of a steering shaft, said rotor having first and second opposing faces and an outer peripheral edge; a face gear formed on said first face of said rotor; a first detection head disposed perpendicular to said rotor; a first spur gear formed on an outer peripheral edge of said first detection head, said first spur gear being engaged with said face gear such that said first detection head rotates in response to rotation of said rotor; a second detection head disposed perpendicular to said rotor; a second spur gear formed on an outer peripheral edge of said second detection head, said second spur gear being engaged with said first spur gear such that said second detection head rotates in response to rotation of said first detection head; a first detection section configured to detect rotation of said first detection head; a second detection section configured to detect rotation of said second detection head; and a controller configured to detect a rotation angle of said rotor according to detection signals output from said first detection section and said second detection section.