Laminated glass lenses
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United States of America Patent
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Dec 27, 1988
Grant Date -
N/A
app pub date -
Aug 3, 1987
filing date -
Aug 3, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
This invention relates to the fabrication of three-layer composite lenses especially suited for ophthalmic applications. The lenses comprise a thin layer of an inorganic glass, desirably photochromic glass, an organic plastic, and an organic adhesive exhibiting flexibility and can be cured at temperatures in the vicinity of room temperature. In general, the linear coefficient of expansion of the glass ranges between about 60-120.times.10.sup.-7 /.degree.C. and that of the plastic between about 200-700.times.10.sup.-7 /.degree.C.
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