Patent ID: 7061700
Filing Date: 2006-06-13
Classification: G02B

Abstract:
1. A lens barrel for holding at least one lens group, comprising: a first lens frame for supporting a first lens group; an first electromagnetic motor including a first cylindrical stator with an axis parallel to an optical axis being taken as a center axis and a first cylindrical rotor that is coaxial with the first cylindrical stator and rotates about the center axis with respect to the first cylindrical stator; a first cam or rotational barrel operatively connected to the first lens frame for converting a rotating motion of the first cylindrical rotor to a linear motion for moving the first lens frame and first lens group in a direction parallel to the optical axis; and a first ferromagnetic material and a second ferromagnetic material positioned relative to opposing ends of the first cylindrical rotor for applying magnetic forces to the first cylindrical rotor in the direction parallel to the optical axis.