Article with radial refractive index gradient and process for its manufacture
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United States of America Patent
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-
May 8, 2001
Grant Date -
N/A
app pub date -
Oct 7, 1999
filing date -
Apr 10, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The transparent article with radial gradient index, according to the invention, comprises a matrix made of a first transparent polymer having a first refractive index n.sub.1 and a first Abbe number .nu..sub.1, a second transparent polymer, diffused into the first polymer in order to produce the radial gradient index and having a second refractive index n.sub.2, different than the first refractive index, and a second Abbe number .nu..sub.2, characterized in that it furthermore comprises an effective amount of an Abbe number modifier agent which reduces by at least 10%, preferably by at least 15%, and more preferably by at least 20%, the value of the Abbe number of that of the first or second polymer which has the refractive index with lower value.
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