| 摘要 |
PROBLEM TO BE SOLVED: To provide a drip proof structure of a lens barrel, capable of having a moderate operational feeling in rotating one of a plurality of driving annular members which can be independently rotated relatively, preventing the other driving annular members from being taken along therewith to rotate, and facilitating manufacture. SOLUTION: A lens barrel includes a plurality of annular members coaxial with each other and relatively rotatable, and the plurality of annular members include the plurality of driving annular members independently rotatable, and an annular member to which the driving annular members are rotated relatively. In the vicinity of the end in the optical axis direction of the driving annular members located to overlap each other inside and outside in the radial direction, a sealing member for stopping up an annular gap between the driving annular members, and a sealing member for stopping up a gap between the respective driving annular members and the annular member rotating relatively is provided. A frictional resistance of a first sealing member produced between a secondary driving annular member and the relatively rotating annular member is greater than a frictional resistance of the second sealing member that urges one of two of the driving annular members to follow a rotation of the other thereof when rotated. COPYRIGHT: (C)2010,JPO&INPIT |
