公开(公告)号：US10890777B2

公开(公告)日：2021-01-12

申请号：US16108554

申请日：2018-08-22

Applicant: Dai Nippon Printing Co., Ltd.

Inventor： Takashi Kuroda ,  Satoru Hamada ,  Keiji Kashima

IPC: G02B5/30 ,  G02B27/28 ,  G02B5/26 ,  G02B5/28

Abstract: Disclosed is a selectively reflective member which can uniformly reflect only a desired wavelength with high efficiency even in a large area and, at the same time, is highly cost effective. Specifically, there is provided an electromagnetic wave reflecting member that reflects electromagnetic waves with a specific wavelength, the electromagnetic wave reflecting member comprising a first selectively reflective layer that reflects only a clockwise or counterclockwise circularly polarized light component with wavelength λ in incident electromagnetic waves, a phase difference layer, and a second selectively reflective layer that reflects only a clockwise or counterclockwise circularly polarized light component with wavelength λ, provided in that order, the phase difference layer having a retardation satisfying the following equation: Re={(2n+1)/2±0.2}×λ wherein Re represents average retardation; λ represents wavelength; and n is an integer of 1 or more.

公开(公告)号：US20180356644A1

公开(公告)日：2018-12-13

申请号：US16108554

申请日：2018-08-22

Applicant: Dai Nippon Printing Co., Ltd.

Inventor： Takashi KURODA ,  Satoru Hamada ,  Keiji Kashima

IPC: G02B27/28 ,  G02B5/26 ,  G02B5/28

CPC classification number: G02B27/288 ,  G02B5/26 ,  G02B5/286

Abstract: Disclosed is a selectively reflective member which can uniformly reflect only a desired wavelength with high efficiency even in a large area and, at the same time, is highly cost effective. Specifically, there is provided an electromagnetic wave reflecting member that reflects electromagnetic waves with a specific wavelength, the electromagnetic wave reflecting member comprising a first selectively reflective layer that reflects only a clockwise or counterclockwise circularly polarized light component with wavelength λ in incident electromagnetic waves, a phase difference layer, and a second selectively reflective layer that reflects only a clockwise or counterclockwise circularly polarized light component with wavelength λ, provided in that order, the phase difference layer having a retardation satisfying the following equation: Re={(2n+1)/2±0.2}×λ wherein Re represents average retardation; λ represents wavelength; and n is an integer of 1 or more.