| 摘要 |
PROBLEM TO BE SOLVED: To directly detect the direction of steering by means of a set of light sensors. SOLUTION: A light reflecting surface 2 for effecting light detection of the light reflection type using the light sensors 3 is formed on the outer peripheral surface of a rotating plate 1 rotating integrally with a steering wheel shaft. The light reflecting surface 2 is formed into a spiral shape such that the amount of reflected light varies depending on the direction and amount of steering, so as to directly detect the direction of steering.
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