Mirror using transparent synthetic resin plate

Details Mirror using transparent synthetic resin plate Mirror using transparent synthetic resin plate

1981-04-17

1983-05-31

Evans, F. L.

350281, G02B 508

Patent

active

043858040

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.

REFERENCES:
patent: 4193668 (1980-03-01), Skinner

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