초록 ▼

The invention provides a rotation sensor which is capable of detecting the turning angle and the turning direction of a detection target such as a steering wheel accurately and in real time over a wide range. The rotation sensor comprises first and second rotation detection means for generating resp

The invention provides a rotation sensor which is capable of detecting the turning angle and the turning direction of a detection target such as a steering wheel accurately and in real time over a wide range. The rotation sensor comprises first and second rotation detection means for generating respective first and second detection signals having the same period and the different phase which repeat with a gradual increase and a gradual decrease concomitantly with rotation of a rotor, and a third rotation detection means for generating the third detection signal which repeats with a gradual increase and a gradual decrease concomitantly with rotation of the rotor, wherein the rough turning angle of the rotor is detected based on the third detection signal and the fine turning angle of the rotor is detected based on the first detection signal or the second detection signals.

대표청구항 ▼

[ What is claimed is:] [1.]1. A rotation sensor comprising;a rotor;first and second rotation detection means for generating first and second detection signals, respectively, having a same period and different phase concomitantly with rotation of said rotor, wherein an output value of at least any on

[ What is claimed is:] [1.]1. A rotation sensor comprising;a rotor;first and second rotation detection means for generating first and second detection signals, respectively, having a same period and different phase concomitantly with rotation of said rotor, wherein an output value of at least any one of said first and second detection signals changes gradually concomitantly with a turning of said rotor;third detection means for generating a third detection signal concomitantly with rotation of said rotor, wherein an output of said third detection signal increases gradually in the entire range of turning angle of said rotor when said rotor turns in a first direction, further wherein the output of said third detection signal decreases gradually when said rotor turns in a second direction opposite of said first direction; anda rotation angle calculation means that reads said third detection signal to obtain a rough turning angle of said rotor based on said third detection signal, reads said first and second detection signals to obtain a fine turning angle of said rotor based on said first and second detection signals, and determines an actual turning angle of said rotor based on the rough turning angle and the fine turning angle.