Optical: systems and elements – Light interference – Produced by coating or lamina
Reexamination Certificate
2008-05-27
2008-05-27
Amari, Alessandro (Department: 2872)
Optical: systems and elements
Light interference
Produced by coating or lamina
C359S587000
Reexamination Certificate
active
07379244
ABSTRACT:
The present invention is dedicated to a cost reduced anti-reflection film of a multi-lamination structure that is reduced in number of layers and increased in thickness of the same for the purpose of facilitating the total control of the film thickness and that can be manufactured in a simplified process so as to reduce the manufacturing cost. Three component layers are deposited one over another on a substrate ranging from 1.90≦ns≦2.10 in refractive index at an arbitrary design basis wavelength within a wavelength range in and near visible band, and these layers exhibit optical properties as in the following table:Refractive Index ‘n’Optical Film thickness ‘nd’1st Layer1.54 ≦ n1≦ 2.000.465 λ ≦ n1d1≦ 0.575 λ2nd Layer1.95 ≦ n2≦ 2.630.490 λ ≦ n2d2≦ 0.508 λ3rd Layer1.35 ≦ n3≦ 1.550.245 λ ≦ n3d3≦ 0.255 λ.
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Shirai Yoshiyuki
Watanabe Yasuhisa
Amari Alessandro
Jacobson & Holman PLLC
Tamron Co., Ltd.
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