OPTIC AXIS SHIFT CONTROL DEVICE

摘要

PURPOSE: A device for controlling optic axis shift is provided to reciprocate an optical detector in the vertical direction of an objective lens instead of driving the objective lens by an actuator, thereby controlling a shifting amount of the optic axis without any error. CONSTITUTION: A device for controlling optic axis shift includes an optical detector(84a) reciprocating on an axis of an objective lens(82b) focusing laser beams generated from a light emitting element(70), a driving element(100) for reciprocating the optical detector on the objective lens, and a shifting controller(74) for shifting a position of the light emitting unit to minimize a deviation signal generated from the optical detector when the driving element reciprocates the optical detector on the objective lens.