Apparatus for checking concentricity between lens barrel and barrel holder

An apparatus for checking concentricity between a barrel holder and a lens barrel rotatably engaged in the barrel holder, the lens barrel including at least one lens coaxially received therein, the apparatus comprising:

• a barrel holder retaining member configured for fixedly retaining the barrel holder in position, the barrel holder retaining member comprising a platform having a recess defined therein for engagingly receiving the barrel holder therein and a sliding slot adjacent to the recess, the sliding slot extending in a radial direction from the recess;
• a rotating member structured and arranged for meshing with the lens barrel;
• a driving unit coupled to the rotating member and configured for driving the rotating member to rotate and thereby rotate the lens barrel, the driving unit including a motor having a motor shaft slidably engaged in the sliding slot and coupled to the rotating member, the sliding of the motor shaft along the sliding slot being configured for driving the rotating member to move along a radial axis toward or away from the recess, the radial axis aligned with a center of the recess;
• a light source configured for emitting light toward a first end of the lens barrel;
• and
• an image sensor capable of being arranged to facing toward an opposite second end of the lens barrel, the image sensor being configured for sensing the light emitted from the light source.