Patent ID: 7012704
Filing Date: 2006-03-14
Classification: G01D

Abstract:
1. A position detecting device for incrementing or decrementing a count value based on a pulse output from an encoder every shift amount of a control target to detect a current value representing a current position of the control target as the count value, the position detecting device comprising: an initialization signal output unit that outputs an initialization signal representing an initialization position at plural positions within a movable range of the control target when the movable range is restricted, or at plural positions within an operating range of integer times of a period when the movable range is not restricted and a same state is periodically repeated; a current value storing unit that stores, in association with identification information for identifying each initialization signal, the current value of the control target at each position where the initialization signal is output by the initialization signal output unit; and a count value setting unit that moves the control target to a position where any of the initialization signal is output when the count value is initialized, and achieves the current value corresponding to the identification information for identifying the initialization signal from the current value storage unit, and sets the current value thus achieved as the count value of the current position of the control target.