Antireflection coating film and antireflection coating material for optical element and optical element
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United States of America Patent
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Nov 7, 2017
Grant Date -
Oct 30, 2014
app pub date -
Jul 2, 2014
filing date -
Feb 12, 2010
priority date (Note) -
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Abstract
An antireflection coating film for an optical element is provided on a surface of a substrate of an optical material and includes first particles having a refractive index (nd) of at least 2.2 or more for the d-line and an average particle size of 10 to 70 nm, second particles of at least one of silica and sericite and having an average particle size of 1 to 11 μm, a colorant of an organic substance and soluble in an organic solvent, and a resin, in which the first particle content is in the range of 10% to 35% by weight, and second particle content is in the range of 1% to 11% by weight. The antireflection coating film has a high effect of preventing surface reflection, a high effect of preventing inner-surface reflection, satisfactory absorption of visible light, and low levels of reflection and scattering in the film.
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