| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a compact lens barrel in a collapsed state capable of performing satisfactory aberration correction in a three-group lens. <P>SOLUTION: This lens barrel 1 includes: a fixed frame 2; a cam frame 5 supported by the fixed frame 2 so as to be movable to a photographic optical axis direction while rotating between a front moving edge and a rear moving edge respectively specified to the photographic optical axis direction; and a shutter frame 30 which moves to the photographic optical axis direction according to the rotation of the cam frame 5 in a rotation regulation state for holding the shutter. A three group frame 10 is always fixed to the shutter frame 30 so that at least one portion of the object side of the three group lens 23 can be arranged at the inner peripheral side of the shutter frame 30, and a two group frame 11 moves to the photographic optical axis direction according to the rotation of the cam frame 5 in the rotation regulation state, and when the cam frame 5 is positioned at the rear moving edge, at least one portion of the image side of the two group lens 22 is housed at the inner peripheral side of the shutter frame 30. <P>COPYRIGHT: (C)2012,JPO&INPIT |
