| 摘要 |
PURPOSE:To eliminate the need for temperature compensation because of the division of counted time (t and T), by finding the shaft direction and displacement of a rotating body from the time difference and periods of two kinds of pulse signal. CONSTITUTION:When a rotor 7 is displaced as shown by an arrow B while rotating as shown by an arrow A according to the displacement of the rotating body, detectors 11 and 14 output pulse signals E1 and E2. The pulse signal E1 is irrelevant to the displacement of the rotor 7 in the direction of the arrow B and the pulse E2 is proportional to the displacement (y) of the rotor 7 in the direction of the arrow B and varies in time difference (t) from the pulse signal E1. Therefore, y=lt/T (where T is the rotating period of the rotor 7). A computing element 17 derives the period T of the pulse signal E1 and the time difference (t) between the pulse signals E1 and E2, and outputs a signal E3 corresponding to the displacement (y), which is indicated on an indicator 18. |
