ND filter
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United States of America Patent
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Jun 20, 2000
Grant Date -
N/A
app pub date -
Apr 22, 1998
filing date -
Jun 27, 1997
priority date (Note) -
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Abstract
In a concentric ND filter in which multi-layered circular ND filter elements whose diameter is decreased stepwise toward the uppermost layer from the lowermost layer are concentrically provided on a first transparent substrate, a surrounding space of the concentrically multi-layered ND filter elements defined by and between the surface of the transparent substrate and the surface of the central ND filter layer of the smallest diameter is filled with a transparent adhesive.
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