| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens barrel which supports each lens group by a guide pole, and in which a position of each lens group is energized in the direction of an optical axis and reflection of unnecessary light from the surface of a guide pole is prevented. SOLUTION: The lens barrel 1 is constituted in such a way that the guide pole 6a is passed through the bearing portion 3a of a second lens moving frame 3 holding a second group lens L2 and the bearing portion 4a of a third lens moving frame 4 holding a third group lens L3, and the second lens moving frame 3 and the third lens moving frame 4 are held parallel to the optical axis AX. A bellows member 20 is disposed around the guide pole 6a between the bearings portions 3a and 4a. Thereby, the second group lens L2 and the third group lens L3 are energized in opposite directions so as to prevent backlash, and reflection of unnecessary light from the surface of the guide pole 6a is prevented. COPYRIGHT: (C)2006,JPO&NCIPI |
