Mirror using transparent synthetic resin plate
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United States of America Patent
Stats
-
May 31, 1983
Grant Date -
N/A
app pub date -
Apr 17, 1981
filing date -
Apr 23, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A mirror which utilizes a transparent synthetic resin such as a polymethyl methacrylate resin in place of glass and is suitable, e.g., as an automobile inside rearview mirror. The back side of the resin plate is coated with a reflective metal film by vacuum deposition, and at least the front side of the resin plate is coated with a surface-hardening film, which is inevitably somewhat permeable to humidity. To prevent warping of the resin plate resulting from its moisture absorption and swelling only in its front region, the reflective film and a back-coat layer covering this film are both made permeable to humidity substantially equally to the surface-hardening film. Preferred material for the reflective film is a Sn--Cu--Cr ternary alloy having high reflectivity and excellent resistance to moisture.
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Cited Art Landscape
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