LIGHT REFLECTING FILM, AND LIGHT CONTROLLING FILM, OPTICAL FILM, FUNCTIONAL GLASS, AND HEAD-UP DISPLAY USING LIGHT REFLECTING FILM

• Main Authors: TANAKA KOICHI, YOKOYAMA YUI, HAYAZAKI TOMOYUKI, TAKAHASHI TOMOHIRO
• Format: Patent
• Language: English; Japanese
• Published: 22.12.2016
• Subjects: ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS INVEHICLES; ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OFTRANSMISSIONS IN VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GASEXHAUST OR FUEL SUPPLY OF PROPULSION UNITS, IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PERFORMING OPERATIONS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TRANSPORTING; VEHICLES IN GENERAL

PROBLEM TO BE SOLVED: To provide a light reflecting film capable of effectively improving only the reflectivity of specific polarized light while maintaining high visible light transmissivity, and also to provide a light controlling film, an optical film, functional glass, and a head-up display using the light reflecting film.SOLUTION: Provided is a light reflecting film which comprises one or more light reflecting layers selected from a light reflecting layer PRL-1 having a central reflection wavelength of 400 nm or more and less than 500 nm and a reflectivity of 5% or more and 25% or less with respect to ordinary light in the central reflection wavelength, a light reflecting layer PRL-2 having a central reflection wavelength of 500 nm or more and less than 600 nm and a reflectivity of 5% or more and 25% or less with respect to ordinary light in the central reflection wavelength, and a light reflecting layer PRL-3 having a central reflection wavelength of 600 nm or more and less than 700 nm and a reflectivity of 5% or more and 25% or less with respect to ordinary light in the central reflection wavelength, and in which at least two light reflecting layers having central reflection wavelengths different from each other are laminated, and the at least two laminated light reflecting layers each have a characteristic of reflecting polarized light of the same orientation.SELECTED DRAWING: Figure 6 【課題】 高い可視光透過率を維持しながら、特定の偏光の反射率のみを有効に向上させることのできる光反射フィルム、並びにこれを用いた光制御フィルム、光学フィルム、機能性ガラス及びヘッドアップディスプレイの提供。【解決手段】 400nm以上500nm未満の中心反射波長をもち該中心反射波長での通常光に対する反射率が５％以上２５％以下である光反射層ＰＲＬ−１と、500nm以上600nm未満の中心反射波長をもち該中心反射波長での通常光に対する反射率が５％以上２５％以下である光反射層ＰＲＬ−２と、600nm以上700nm未満の中心反射波長をもち該中心反射波長での通常光に対する反射率が５％以上２５％以下である光反射層PＰＲＬ−３のうち、１つ以上の光反射層を含み、かつ互いに異なる中心反射波長をもつ少なくとも２つ以上の光反射層が積層され、積層される前記少なくとも２つ以上の光反射層は、いずれも同じ向きの偏光を反射する特性を有する光反射フィルム。【選択図】図６