Position detecting unit, lens unit and camera furnished with same, lens unit manufacturing method, and position detecting method

摘要

Position detection unit detecting absolute positions without moving an object to be detected. The detection unit having a first sensor for outputting a monotone signal, that changes in response to displacement of an object to be detected; a second sensor for outputting two sinusoidal signals in response to displacement of the object to be detected; a first memory for storing a monotone signal relative to the position of the object to; a second memory for storing max and min values for each sinusoidal signal; and a position calculator for identifying the cycle of the sinusoidal signal in which the object to be detected is positioned based on the detected monotone signal and stored monotone signal data, and for calculating the position of the object to be detected within the identified cycle and obtaining an absolute position, based on the detected sinusoidal signal and the stored max/min data.