| 摘要 |
<P>PROBLEM TO BE SOLVED: To facilitate replacement of a filter attached to a front frame of a zoom lens by attaching several filter frames to an afocal part of the zoom lens. Ž<P>SOLUTION: The filter frame A(1) and the filter frame B(2) are provided in the afocal part of the zoom lens. A supporting pin (12) and a driving pin (11) are provided in the filter frame A(1) and the filter frame B(2), and the filter frame A(1) and the filter frame B(2) are rotated and moved by an arm A(3) and an arm B(4) interlocked with the driving pin (11). A cam A(5) and a cam B(6) controlling moving amounts of the arm A(3) and the arm B(4) are attached to the end faces of the arm A(3) and the arm B(4). A rotary shaft (9) is attached to the cam A(5) and the cam B(6), and rotational angles of the filter frame A(1) and the filter frame B(2) are controlled by a rotation control plate (7) and a photosensor (8). A DC motor (10) is attached to the end face of the rotary shaft (9) as motive power for the rotary shaft (9). Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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