Light-quantity control apparatus and optical apparatus
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United States of America Patent
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Jul 22, 2014
Grant Date -
May 1, 2014
app pub date -
Jan 2, 2014
filing date -
Jul 7, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
The light-quantity control apparatus includes a stop blade including a stop portion and a supported portion rotatably supported with respect to a base member, a shutter blade having a shutter portion and a supported portion rotatably supported with respect to the base member, and a driving member disposed between the shutter and stop blades and rotating around the light-passing aperture to rotate the stop blade. The stop and shutter blades have tilts in their supported portions toward a same one side in the optical axis direction so that the stop and shutter portions are distant from the supported portions in the optical axis direction. The driving member has a shape concave toward the one side from its outer circumferential side portion to its inner circumferential side portion. A concave space facing the light-passing aperture is formed inside than the stop and shutter blades and the driving member.
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