| 摘要 |
PROBLEM TO BE SOLVED: To provide a compression storage structure capable of reliably guiding a zoom lens system of a first and third group-integrated movement type by direct advance. SOLUTION: A lens barrel of a zoom lens system has at least a first, second and third lens groups in this order from the object side. In power variation, the first and third lens groups are integrally moved and, in storage, the first and third lens groups are brought close to each other. The compression storage structure is provided with: a directly-advancing guide groove 15d which is parallel to an optical axis and formed as a through-groove on a second group moving cylinder 17; a first directly-advancing guide protrusion 15f which is disposed on a first moving cylinder 15, is relatively-slidably engaged with the directly-advancing guide groove from the outside of the radial direction and is provided, on the center part, with a hanging groove 15e directed to a direction parallel to the optical axis and having a closed rear end part; a second directly-advancing guide protrusion 18a formed on a third group moving cylinder 18 which is relatively slidably engaged with the directly-advancing guide groove from the inside of the radial direction; and a direct advance key 18b which is formed on the front end part on the second directly-advancing guide protrusion and is engaged with the hanging groove. The retreat end of the third group moving group moving cylinder relative to the first group moving cylinder is regulated on the position where the direct advance key abuts on the rear end closing part of the hanging groove. COPYRIGHT: (C)2004,JPO&NCIPI
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