Light shielding blade for camera made of para-orientation aromatic polyamide film
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United States of America Patent
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Dec 14, 1999
Grant Date -
N/A
app pub date -
May 1, 1998
filing date -
May 12, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
A light-shielding blade for use in cameras utilizes a film of para-type aromatic polyamide for its base material. The light-shielding blade has a single-layer structure using an aramid film as its blade material. The film is added with carbon black at a ratio of 2 to 10 percent by weight relative to a total weight of the blade material. Alternatively, the light-shielding blade has a laminated structure with a plurality of aramid films stacked each other and having a thickness of 2 to 30 microns each, a total thickness being set to a range of 50 to 200 microns.
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