Patent ID: 7548058
Filing Date: 2009-06-16
Classification: G01D

Abstract:
1. A rotational angle detector equipped with an absolute rotational angle detecting means for detecting an absolute rotational angle including a frequency of a measured rotational element to output the absolute rotational angle, comprising: a rotational-angle change-amount calculating means for calculating the amount of change of the absolute rotational angle from one sampling period to another; a transition-interval setting means for setting a transition interval on the basis of the sampling period and the amount of change of the absolute rotational angle; and a pulse generating means for generating pulses transitioning in order at the transition intervals in accordance with the change of the absolute rotational angle in the sampling period on the basis of a pulse pattern present in correspondence with each predetermined-unit region of the absolute rotational angle, wherein the pulses thus generated are outputted as a relative rotational-angle signal.