Infrared absorption filter
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United States of America Patent
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-
Apr 1, 2003
Grant Date -
Jun 28, 2001
app pub date -
Dec 19, 2000
filing date -
Dec 20, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An infrared absorption filter which has absorption in the near-infrared region, manifests high light transmission in the visible region, and does not have large absorption of specific wavelength in the visible region, further, is excellent in environmental stability and durability and has little optical defect, the filter comprising an infrared absorption layer laminated at least on one surface of a transparent polymer film, wherein said transparent polymer film is a film comprising a polymer easy adhesion layer laminated at least on one surface, said transparent polymer film contains substantially no particle, and said transparent polymer film contains foreign materials having a size of 20 .mu.m or more in an amount of 10/m.sup.2 or less per unit area of the film.
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