Liquid crystal optical element comprising a resin layer having a surface hardness of b or less
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United States of America Patent
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Aug 7, 2007
Grant Date -
Sep 12, 2002
app pub date -
Dec 28, 2001
filing date -
Dec 28, 2000
priority date (Note) -
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Abstract
On substrates 2a, 2b of a chiral nematic liquid crystal optical element 1, transparent electrodes 3a, 3b and electrical insulation layers 4a, 4b are formed, and further, resin layers 5a, 5b hating a pencil hardness of 'B' or less are formed on the electrical insulation layers by a spin coating method so as to be in contact with a liquid crystal layer 7. When the surface hardness of the resin layers is to be measured, a glass substrate on which a resin layer is formed by screen-printing is prepared as a test piece, and the test piece is fitted to a pencil-scratching tester. The surface hardness is measured by scratching the test piece with two kinds of testing pencil selected from testing pencils having 17 grades of density.
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