| 摘要 |
PURPOSE: A retracting mechanism of a retractable lens is provided to reduce the length of the retractable lens in its fully retracted state to a minimum while securing the space for adjustment of the position-adjustable lens group in an operating state of the retractable lens. CONSTITUTION: In the device, the inner flange(12c) of the first external barrel(12) is provided at radially opposite positions thereon with respect to the photographing optical axis Z1 with a pair of first guide grooves(12b), respectively, while the first lens group adjustment ring(2) is provided on an outer peripheral surface thereof with a corresponding pair of guide projections(2b) which project radially outwards in opposite directions away from each other to be slidably fitted in the pair of first guide grooves(12b), respectively. Only one guide projection 2b and the associated first guide groove(12b). The pair of first guide grooves(12b) extend parallel to the photographing optical axis Z1 so that the combination of the first lens frame(1) and the first lens group adjustment ring(2) is movable in the optical axis direction with respect to the first external barrel(12) by engagement of the pair of guide projections(2b) with the pair of first guide grooves(12b).
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