The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 01, 2025
Filed:
Aug. 05, 2022
Toppan Inc., Tokyo, JP;
Yukari Oda, Tokyo, JP;
Masashi Kawashita, Tokyo, JP;
Yoshiko Ishimaru, Tokyo, JP;
Azusa Yamagishi, Tokyo, JP;
TOPPAN INC., Tokyo, JP;
Abstract
An optical device includes a concave-convex structure layer having a concavo-convex structure on a surface thereof, the concavo-convex structure formed of a plurality of convexities or a plurality of concavities which are arranged with a sub-wavelength period, a high refractive index layer made of a material having a refractive index higher than that of the concavo-convex structure layer and located on the concavo-convex structure while having a surface conforming to the concavo-convex structure, and a low refractive index layer made of a material having a refractive index lower than that of the high refractive index layer and located on the high refractive index layer. The high refractive layer includes first grating high refractive index portions located at a bottom of the concavo-convex structure to form a first sub-wavelength grating, and second grating high refractive index portions located at a top of the concavo-convex structure to form a second sub-wavelength grating.