| 摘要 |
PROBLEM TO BE SOLVED: To obtain an optical unit provided with a mechanism for forcibly retreating an optical filter from an optical axis to the outward of the optical axis when a user forcibly performs collapsing operation in the case of the housing/collapsing operation of a collapsible mount type lens or when such abnormality occurs that a retreat mechanism for retreating the optical filter from the optical axis to the outward of the optical axis is not actuated. SOLUTION: The collapsible mount type optical unit is equipped with a fixed ring 15, a rear lens barrel 17, a 2nd group lens frame 13 capable of moving along in an optical axis L direction with reference to the ring 15 and the lens barrel 17, an infrared region cut filter 91 arranged at the rear of the frame 13 and the retreat mechanism 88 for retreating the filter 91 from the optical axis L to the outward of the optical axis when the frame 13 comes close to the filter 91, and is provided with the forcible retreat mechanism (projection part) 92 for forcibly retreating the filter 91 from the optical axis when the filter 91 can not be retreated from the optical axis by the mechanism 88. COPYRIGHT: (C)2004,JPO |
