Patent ID: 9207067
Filing Date: 2015-12-08
Classification: G01B

Abstract:
1. A position detecting apparatus comprising: a moving body having a lens mounted thereon; an input unit that receives an input command for moving the lens; a driver that moves the moving body in a first direction or a second direction according to the input command; a first sensor and a second sensor respectively mounted on the moving body; a displacement detection pattern unit having a plurality of reflecting bodies arranged thereon at predetermined intervals to reflect light emitted by the first sensor or the second sensor; and a controller that determines turn-on periods of the first and the second sensors based on an intersection point of signal waveforms sensed by the first and the second sensors, controls the first and the second sensors to be alternately turned on based on the determined turn-on periods to emit the light, and in response to a light reflected by the displacement detection pattern unit being sensed by the first or the second sensors, detects a position of the lens based on the sensing results.