| 摘要 |
PROBLEM TO BE SOLVED: To provide a light quantity controller which gives good accuracy of an f-number as a light quantity controller equipped with a compact driving means made shorter in length in the shaft direction and made smaller in size in the radial direction and improved in terms of output. SOLUTION: The light quantity controller is equipped with: a 1st driving means constituted of a rotor, a coil and a stator which is equipped with an outside magnetic pole part and an inside magnetic pole part; a 2nd driving means constituted of a rotor, a coil and a stator; an output means capable of rotating by coupling the rotor being the component element of the 1st driving means and the rotor being the component element of the 2nd driving means; a 1st bottom board holding the 1st and the 2nd driving means; a light shielding member for controlling the quantity of light passing through an aperture part provided on the 1st bottom board in interlocking with the rotation of the output means; and a 2nd bottom board rotatably supporting the light shielding member. The relative position of the 1st bottom board to the 2nd bottom board is made adjustable. COPYRIGHT: (C)2004,JPO
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