| 摘要 |
A rotation member which rotates in cooperation with a steering wheel is provided with a cord board and a turning amount and a turning direction of the steering wheel are detected by the cord board and photo-interrupters. A first gear of the rotation member meshes with a second gear to turn a screw shaft, thereby moving a carriage in an axial direction of the screw shaft and also moving a slit of a douser mounted to the carriage relative to an LED and a two-piece photodiode. An absolute angle from a neutral position of the steering wheel is detected based on a change in an amount of light received by the two-piece photodiode which changes according to a moving position of the slit.
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