Polarizing element
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United States of America Patent
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Mar 27, 2012
Grant Date -
Jul 28, 2011
app pub date -
Jan 31, 2011
filing date -
Jul 31, 2008
priority date (Note) -
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Abstract
A polarizing element includes fine metal particles formed in numerous regions that were occupied by respective substantially needle-like metal halide fine particles before reduction that are oriented and dispersed in a glass substrate such that the lengthwise directions thereof are almost the same, the fine metal particles being produced by heat-treating the glass substrate in a reducing atmosphere to reduce the substantially needle-like metal halide fine particles. The number of fine metal particles present in at least some of the numerous regions is two or more in each region, 90% or more of the regions each have a volume of 2,500 to 2,500,000 nm3, and the individual volumes of the fine metal particles present in each region are 4 to 40% of the volume of the region in 90% or more of the total number of the regions.
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