Light quantity adjustment apparatus, lens unit and optical apparatus provided with the same
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United States of America Patent
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Feb 18, 2014
Grant Date -
Nov 15, 2012
app pub date -
May 8, 2012
filing date -
May 10, 2011
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A plurality of blade members is overlapped and disposed in the shape of scales in a ring-shaped board having an optical-axis aperture at the center, and is held from above by a driving ring so that each blade member performs open/close motion. At this point, an elastic member is disposed between the blade members and the board to press each blade member against the driving ring side, or an elastic member is disposed between the blade members and the driving ring to press the blade members against the board side, and in this state, the blade members are opened and closed.
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