Mirror using transparent synthetic resin plate
First Claim
1. A mirror comprising:
- a transparent plate of a synthetic resin;
a surface-hardening film coated at least on a front surface of the resin plate;
a reflective film of a metal resistant to moisture deposited on the back side of the resin plate; and
a back-coat layer closely covering the outer surface of the reflective film,the surface-hardening film, the reflective film and the back-coat layer being all substantially equally permeable to humidity.
1 Assignment
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Accused Products
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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Citations
9 Claims
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1. A mirror comprising:
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a transparent plate of a synthetic resin; a surface-hardening film coated at least on a front surface of the resin plate; a reflective film of a metal resistant to moisture deposited on the back side of the resin plate; and a back-coat layer closely covering the outer surface of the reflective film, the surface-hardening film, the reflective film and the back-coat layer being all substantially equally permeable to humidity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification