Optical: systems and elements – Light interference – Produced by coating or lamina
Reexamination Certificate
2007-03-20
2007-03-20
Assaf, Fayez G. (Department: 2872)
Optical: systems and elements
Light interference
Produced by coating or lamina
C359S580000
Reexamination Certificate
active
11091332
ABSTRACT:
An optical substrate includes a transparent substrate; an interference spot-preventing layer composed of at least one sublayer, the interference spot-preventing layer being coated on the transparent substrate; and a hard coat layer disposed on the interference spot-preventing layer. In the optical substrate, when the complex refractive index of the hard coat layer at light of 550 nm is represented as nH−ik, nHis 1.45 to 1.59 and k is substantially zero. When the optical admittance of the interface between the interference spot-preventing layer and the hard coat layer is represented as (x+iy), x and y satisfy the formula of (x−nH)2+y2≦0.08.
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Assaf Fayez G.
Bridgestone Corporation
Sughrue & Mion, PLLC
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