Film confined to a frame having relative anisotropic expansion characteristics
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United States of America Patent
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Dec 12, 2000
Grant Date -
N/A
app pub date -
Oct 1, 1998
filing date -
Oct 1, 1998
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Abstract
An assembly comprising a film bounded by a frame, the film having a first thermal expansion coefficient along a first direction parallel to the film and a second thermal expansion coefficient along a second direction parallel to the film, wherein thermal expansion of the film compared to that of the frame is greater along the first direction than along the second direction, and wherein the film has a shape at an ambient reference temperature different from that of the frame, the shape of the film being selected to reduce clearance while allowing sufficient room between the film and the frame for thermal expansion in the first direction for temperatures up to a predetermined elevated reference temperature.
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