| 摘要 |
PROBLEM TO BE SOLVED: To obtain a collapsible lens barrel whose storage length can be shortened furthermore and to obtain a collapsing method. SOLUTION: In the collapsible zoom lens barrel having: a plurality of lens groups which are placed on a single optical axis in a photographing permission state and are concerned in magnification varying; and an imaging element which forms an image obtained by the plurality of lens groups, the plurality of lens groups include at least one retreating lens group which is placed off the single optical axis in such a collapsed state that photographing is impossible. In a direction parallel to the optical axis, a distance between the retreating lens group in a collapsed state that photographing is impossible and the imaging element placed on the single optical axis is shorter than a distance between the retreating lens group in a photographing permission state and the imaging element placed on the single optical axis. COPYRIGHT: (C)2006,JPO&NCIPI
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