Lens moving mechanism for finely moving a portion of an objective lens by rotating a holding member

摘要

A lens moving mechanism for finely moving at least a lens portion of an objective lens in a direction of an optical axis of the objective lens. The lens moving mechanism includes a holding member holding the lens portion and a disc-like disc cam member provided with a cam surface, which lies in a peripheral portion of the disc-like disc cam member. The disc cam member is rotated to thereby move the holding member on a track conforming to the cam surface.