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:
Sep. 05, 2006
Filed:
Dec. 20, 2002
Masayuki Sekiguchi, Chiba-ken, JP;
Yasuhiro Sakakura, Ibaraki-ken, JP;
Hiraku Shibata, Chiba-ken, JP;
Masayuki Sekiguchi, Chiba-ken, JP;
Yasuhiro Sakakura, Ibaraki-ken, JP;
Hiraku Shibata, Chiba-ken, JP;
JSR Corporation, Tokyo, JP;
Abstract
An optical film is provided, which displays a positive wavelength dependency across the entire wavelength region from 400 to 800 nm, and is capable of imparting a specified retardation to transmitted light with a single sheet of film. The optical film particularly, includes a thermoplastic norbornene-based resin with a specified structure formed of a structural unit (I) which imparts a positive birefringence and a structural unit (II) which imparts a negative birefringence, and which satisfies particular conditions with respect to ΔN(λ), ΔN(λ), ΔN(800) and ΔN(800) wherein ΔN(λ) and ΔN(λ) represent the difference between a refractive index Nx(λ) in an x axis direction at a wavelength λ, and a refractive index Ny(λ) in a y axis direction, and ΔN(800) and ΔN(800) represent the difference in refractive indexes at a wavelength of 800 nm, and the x axis represents the stretching direction and the y axis represents the in-plane direction perpendicular to the x direction.