| 摘要 |
PROBLEM TO BE SOLVED: To provide a camera diaphragm apparatus where the fluctuation of output voltage of a Hall element is appropriately corrected even if the fluctuation occurs due to a change in ambient temperature, and the stop amount of an aperture part can be highly accurately set. SOLUTION: In the camera diaphragm apparatus, three light control members 35 are made movable in a direction of shielding/opening the aperture part 25a cooperatively with the rotation of a driving ring 27, and a sensor magnet 28 is arranged on the driving ring 27, and the Hall element 24a is arranged on the side facing the sensor magnet 28 of a base member 25, and the output voltage of the Hall element 24a outputted in accordance with the magnetic flux of the sensor magnet 28 is corrected so as to come close to a reference voltage previously inputted to a control part (not illustrated). COPYRIGHT: (C)2005,JPO&NCIPI
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