Patent ID: 7704036

Claim:
A driving source, comprising: a base member disposed on a casing; a fixed shaft extending from the base member into the casing; a rotating member coaxial to the fixed shaft; a bearing supporting the rotating member so as to be rotatable around the fixed shaft; a stator member coaxial to the fixed shaft; a rotator disposed on the rotating member so as to face the stator member; a partition wall member which is disposed between the stator member and the rotator so as to be coaxial to the fixed shaft, the partition wall member separating an air atmosphere outside the casing from a vacuum atmosphere in the casing; and an outer circumference member which is a part of the base member disposed on an outer side of the fixed shaft so as to be coaxial to the fixed shaft, wherein the stator member is disposed on an outer circumference of the fixed shaft, and the bearing is disposed on the inner circumference of the outer circumference member.