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:
Apr. 09, 2019
Filed:
Sep. 10, 2015
Zeon Corporation, Chiyoda-ku, Tokyo, JP;
Taku Hatano, Tokyo, JP;
Kazuhiro Oosato, Tokyo, JP;
ZEON CORPORATION, Chiyoda-ku, Tokyo, JP;
Abstract
A circularly polarizing plate includes: a polarizing film; a λ/2 plate having a slow axis in a direction forming an angle of 15°±5° with respect to an absorption axis of the polarizing film; and a λ/4 plate having a slow axis in a direction forming an angle of 75°±5° with respect to the absorption axis of the polarizing film, which are provided in this order. A wavelength dispersion of the λ/2 plate and a wavelength dispersion of the λ/4 plate approximately coincide with each other. A refractive index of one of the λ/2 plate and the λ/4 plate is nz≥nx>ny, and a refractive index of the other of the λ/2 plate and the λ/4 plate is nx>ny≥nz, where nx, ny and nz represent refractive indices in in-plane slow axis, in-plane fast axis, and thickness directions, respectively.