Light quantity adjustment apparatus, lens unit and optical apparatus provided with the same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Aug 5, 2014
Grant Date -
Aug 30, 2012
app pub date -
Feb 24, 2012
filing date -
Feb 28, 2011
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A light quantity adjustment apparatus has a board including an exposure aperture, blade members adjusting a quantity of light passing through the exposure aperture, and a driving device for driving the blade members. The driving device is provided with an electromagnetic coil, a magnet rotor rotating by applying a current to the electromagnetic coil, a rotating shaft, a coil frame having bearings, a reference surface for positioning formed in the coil frame, and a shield yoke supported relative to the reference surface and magnetically shielding the magnet rotor. The board includes a support plane supporting the blade members, a concave portion in the support plane to store the driving member, a support portion in the concave portion to support one end of the shield yoke, and a holding device for storing and supporting the driving member in the concave portion.
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