| 摘要 |
<p>A rotational angle detecting device, including first and second detecting means 1A, 1B for detecting adjacent portions of targets 15 (20, 22, 36, 38) provided on a rotational member 12 (16, 17) and outputting a detection signal whose phases are different by a predetermined electrical angle, and for detecting a displacement angle of the rotational member 12 (16, 17) based on the portions detected by the first and second detecting means 1A, 1B, respectively. The rotational angle detecting device has first through third judging means 14 for judging whether each of the detection signals of the first and second detecting means 1A, 1B is greater or less than a substantially middle value between the maximum value and minimum value of the detection signals, for judging a relation in magnitude between the detection signals of the first and second detecting means 1A, 1B and for judging the magnitudes of differences between each of the detection signals and the substantially middle value, and detects the displacement angle in the direction of rotation of the rotational member 12 (16, 17) based on the results of the judgments by the respective judging means 14. <IMAGE></p> |
