WHITE REFLECTIVE FILM

• Main Authors: SAKAGUCHI, Yoshihiko, FUNATOMI, Takashi, MAEKAWA, Shigetoshi, NAKAMURA, Hirokado
• Format: Patent
• Language: English; French; Japanese
• Published: 26.01.2017
• Subjects: BLASTING; 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; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; HEATING; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21Sand F21V, RELATING TO THEFORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THELIGHT EMITTED; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; LIGHTING; MECHANICAL ENGINEERING; NON-LINEAR OPTICS; NON-PORTABLE LIGHTING DEVICES; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PERFORMING OPERATIONS; PHYSICS; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; SYSTEMS THEREOF; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TRANSPORTING; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

[Problem] To provide a backlight which has excellent luminance characteristics and goes along very well with other components at a low cost by using a white reflective film that has excellent economic efficiency, film formability, whiteness, reflectivity, lightweightness and surface profile. [Solution] A white reflective film for edge-lit backlights, which satisfies the following conditions (i)-(iii). (i) The white reflective film is a multilayer film composed of two or more layers including at least a surface layer (A) and a base layer (B) that contains air bubbles. (ii) The surface of the surface layer (A) has a center plane average roughness (SRa) of 90 nm or more but less than 300 nm. (iii) The surface layer (A) has a domain composed of a polymer that is different from the polymer that constitutes the matrix. La présente invention vise à fournir un rétro-éclairage ayant d'excellentes caractéristiques de luminance et acceptant très bien d'autres composants à faible coût par l'utilisation d'un film réfléchissant blanc qui a un excellent rendement économique, une excellente aptitude à la formation d'un film, une excellente blancheur, une excellente réflectivité, une excellente légèreté et un excellent profil de surface. À cet effet, la présente invention divulgue un film réfléchissant blanc pour des rétroéclairages périphériques, qui satisfait les conditions suivantes (i) à (iii). (i) Le film réfléchissant blanc est un film multicouche composé d'au moins deux couches comprenant au moins une couche de surface (A) et une couche de base (B) contenant des bulles d'air. (ii) La surface de la couche de surface (A) a une rugosité moyenne du plan central (SRa) d'au moins 90 nm mais inférieure de 300 nm au maximum. (iii) La couche de surface (A) a un domaine composée d'un polymère qui diffère du polymère constituant la matrice. 【課題】経済性、製膜性、白色性、反射性、軽量性、表面形状に優れ、この白色反射フィルムを用いることにより輝度特性及び他部材との相性に優れたバックライトを安価に提供する。 【解決手段】次の（i）～（iii）を満たす、エッジ型バックライト用白色反射フィルム。 （i）表層（Ａ）と気泡を含有する基材層（Ｂ）を少なくとも含む２層以上の積層フィルムであること。 （ii）表層（Ａ）の表面の中心面平均粗さ（ＳＲａ）が９０ｎｍ以上３００ｎｍ未満であること。 （iii）表層（Ａ）が、マトリックスを構成するポリマーと異なるポリマーからなるドメインを有してなること。