Optical element, optical system and optical apparatus having antireflection coating

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United States of America Patent

PATENT NO 9069126
APP PUB NO 20140177059A1
SERIAL NO

14132083

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Abstract

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An optical element includes a transparent substrate and an antireflection coating on the substrate. The antireflection coating includes an intermediate layer on the substrate, and an undulation layer that is formed on the intermediate layer and has a plurality of convexes arrayed with spacing shorter than a shortest wavelength. The undulation layer has a portion where refractive index increases from a light incident side to the substrate. The intermediate layer has a first layer closest to the substrate, and a second layer formed on the first layer. A refractive index n1 of the first layer, a refractive index n2 of the second layer, and a refractive index ns of the substrate satisfy the following conditional equations:

description='In-line Formulae' end='lead'1.75≦ns≦2.20;description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'n1<n2; anddescription='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'n1<ns. description='In-line Formulae' end='tail'

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Patent Owner(s)

  • CANON KABUSHIKI KAISHA

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ishimatsu, Rie Utsunomiya, JP 16 60
Okuno, Takeharu Utsunomiya, JP 21 188

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