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:
Nov. 10, 2020
Filed:
Nov. 08, 2019
Fujifilm Corporation, Tokyo, JP;
Makoto Ishiguro, Minami-Ashigara, JP;
Nobuhiko Ichihara, Minami-Ashigara, JP;
Michio Nagai, Minami-Ashigara, JP;
FUJIFILM Corporation, Tokyo, JP;
Abstract
Provided are a decorative sheet for making the element using external light, for example, a camera or a sensor inconspicuous to an observer and an optical device and an image display device that include the above-described decorative sheet. The decorative sheet including a circularly polarized light reflecting layer, a λ/4 plate A, a linear polarizer, and a λ/4 plate B in this order, in which the circularly polarized light reflecting layer includes one or more cholesteric liquid crystal layers having wavelength selective reflecting properties, in a case where an integral reflectivity at a wavelength λ nm is represented by I-R(λ), I-R(630), I-R(550), and I-R(450) of the circularly polarized light reflecting layer are 30% or higher, and an angle between a slow axis of the λ/4 plate A and an absorption axis of the linear polarizer and an angle between a slow axis of the λ/4 plate B and the absorption axis of the linear polarizer are 45°±10°, respectively.