LENS POSITION DETECTOR, LENS BARREL AND IMAGING DEVICE

摘要

A lens position detector (200) comprising a position detecting magnet (202), a magnetic force detection sensor (204), and a position information generating means (206). The position detecting magnet (202) is mounted to the rear surface of a lens holding frame (1460). The magnetic force detection sensor (204) generates a detection signal having a magnitude according to the intensity of a magnetic force emitted from the magnetic pole of the position detecting magnet (202), and is disposed on a straight line being parallel to the optical axis and passing through the position detecting magnet (202). The magnetic force detection sensor (204) outputs a detection signal at a voltage corresponding (proportional) to the intensity of the magnetic force. The amplifying circuit (208) of the position information generating means (206) amplifies a detection signal Ss from the magnetic force detection sensor (204).