Plastic mirror article and method of making same

Details Plastic mirror article and method of making same Plastic mirror article and method of making same

1978-12-19

1980-11-04

Ansher, Harold

Stock material or miscellaneous articles

Structurally defined web or sheet

Fold at edge

156257, 156268, 156311, 264 1, 264 39, 427168, 427289, 427370, 428156, 428409, 428913, 350306, G02B 508, B32B 3118, B32B 3120

Patent

active

042320755

ABSTRACT:
A mirror construction and method wherein shatter resistant optical quality first surface mirrors may be inexpensively fabricated. A styrene sheet is press polished and the polished surface is coated with a reflective layer. The press polished, reflectively coated styrene sheet may be subjected to further processing steps in order to produce a highly rigid and flat mirror. A surface of the styrene sheet is scored along a straight line to a depth that does not penetrate the front mirrored surface, but rather leaves a relatively thin region along the scored line having a minimal extent in the plane of the sheet. The styrene sheet is then folded, bringing portions on either side of the scored line towards each other and partially splitting the thin region. A membrane remains along the scored line to form a semi-flexing hinge. The ability of the membrane to withstand cracking can be improved somewhat by carrying out the folding step at a temperature generally greater than approximately 20.degree. C.

REFERENCES:
patent: 1941438 (1933-12-01), Kiefer
patent: 2680695 (1954-06-01), Judd
patent: 3489067 (1970-01-01), Hallis
patent: 3761338 (1973-09-01), Ungar et al.
patent: 4101707 (1978-07-01), Henry
patent: 4119107 (1978-10-01), Pinzone et al.

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