| 摘要 |
PROBLEM TO BE SOLVED: To provide a light quantity adjusting device, wherein blade members can stably be driven by reducing frictional load when bearing a rotor shaft, and backlash is hardly caused to the blade members. SOLUTION: The light quantity adjusting device includes: a substrate having an optical path aperture; blade members disposed on the substrate and used to adjust a quantity of light passing through the optical path aperture; and an electromagnetic drive device that opens or closes the blade members. The electromagnetic drive device has: a rotor shaft; an excitation coil that applies rotating force to the rotor shaft; and a frame that freely rotatably bears the rotor shaft. In this case, the rotor shaft has a first shaft end formed in a sharp shape at one end and a second shaft end formed in a cylindrical shape at the other end. The frame has a bearing recess formed in a conical shape for supporting the first shaft end and a bearing hole formed in a cylindrical shape for supporting the second shaft end. The electromagnetic drive device is disposed such that the first shaft end of the rotor shaft is located on the substrate side. The arm member that transmits opening/closing drive force to the blade members is connected to the first shaft end of the rotor shaft. COPYRIGHT: (C)2008,JPO&INPIT
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