POSITION SENSING ASSEMBLY AND OPTICAL DEVICE HAVING THE SAME

摘要

PURPOSE: A position detection assembly and an optical device having the same are provided to accurately detect position variation by improving the linearity of a detected signal of a magnetism detection unit by operation of a protrusion unit formed in each end of both polarities of a magnet. CONSTITUTION: An optical device includes a magnet(30) and a magnetism detection unit(90). The magnetism detection unit outputs a signal varied according to change of a magnetic force. The magnet is separated from the magnetism detection unit, is movably arranged with respect to the magnetism detection unit and includes a protrusion unit protruded from each end of both polarities on one plane facing the magnetism detection unit.