Patent ID: 6693714
Filing Date: 2004-02-17
Classification: G01B,G01S

Abstract:
A position sensor for detecting two movement limiting positions of a movable body that reciprocates, the position sensor comprising:two detectors for detecting two corresponding portions provided on one surface of the movable body, wherein a first of the two detectors is disposed so as to detect a first of the two corresponding portions when the movable body is positioned in one of the two movement limiting positions and a second of the two detectors is disposed so as to detect a second of the two corresponding portions when the movable body is positioned in an other of the two movement limiting positions; wherein the two corresponding portions are disposed on a line which is not parallel to nor perpendicular to a moving direction of the movable body; wherein the first of the two detectors for detecting the first of the two corresponding portions is disposed so that when the first detector detects the first corresponding portion during movement of the movable body in a first direction, the second of the two corresponding portions is positioned so as to move the second of the two corresponding portions in the first direction beyond the first detector; and wherein the second detector for detecting the second corresponding portion is disposed so that when the second detector detects the second corresponding portion during movement of the movable body in a second direction, opposite the first direction, the first corresponding portion is positioned so as to move the first corresponding portion in the second direction beyond the second detector.