Parabolic membrane mirror having a shape-restorative force
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United States of America Patent
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Jun 22, 2004
Issued Date -
N/A
app pub date -
Mar 17, 2003
filing date -
May 2, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical quality, freestanding, compliant membrane mirror is cast with a concave parabolic shape, and includes a substrate and a reflective stress coating. The stress coating is in compression and applies a tensile shear stress to the substrate that opposes and offsets the intrinsic stress in the substrate that would otherwise decrease the concavity. The stress coating generates a force to restore the membrane mirror to its cast concave parabolic shape when an external force deforms the mirror.
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