| 摘要 |
<p>The iris drive mechanism (1) has two diaphragms (13,15) which are opened and/or closed by a first lever (9) rotated by an ideal gyrator (IG) meter (5) and a second lever (17) in which an engagement hole (17A) with which an output shaft (5A) of the IG meter is engaged, and an engagement pin (17B) engaged into an oblong hole (9B) formed through the first lever, and a rotary shaft (11) to which the first lever is rotatably supported. The first lever (9) is rotated through the second lever (17) by the IG meter. Therefore, when an aperture is small, a resolution of the F number can be increased, and this can enhance the automatic exposure control performance. <IMAGE></p> |
