CN115325511A - Led照明器具用膜、led照明器具 - Google Patents
Led照明器具用膜、led照明器具 Download PDFInfo
- Publication number
- CN115325511A CN115325511A CN202210905699.0A CN202210905699A CN115325511A CN 115325511 A CN115325511 A CN 115325511A CN 202210905699 A CN202210905699 A CN 202210905699A CN 115325511 A CN115325511 A CN 115325511A
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- CN
- China
- Prior art keywords
- refractive index
- led lighting
- film
- light guide
- low refractive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
本发明提供在导光板的一端面设有LED光源且使光从与配置有LED光源的端面(入射端面)对置的端面出射的照明器具中,可以抑制光的波导效率降低、并且可以在导光单元的表面和/或背面层叠任意膜或实施任意表面处理的LED照明器具用膜;并且提供具备该LED照明器具用膜的LED照明器具。本发明的LED照明器具用膜具备基材、和配置于该基材的至少一侧的低折射率层。在一实施方式中,上述低折射率层的折射率为1.25以下。在一实施方式中,上述低折射率层为空隙层。
Description
本申请是申请日为2019年1月23日、申请号为201980010046.2、发明名称为“LED照明器具用膜、LED照明器具”的申请的分案申请。
技术领域
本发明涉及一种LED照明器具用膜及使用该LED照明器具用膜的LED照明器具。
背景技术
作为设计性优异的照明器具,已知有一种照明器具,其以LED为光源,并隔着导光板照射光,从而进行照明,该LED照明器具在导光板的一端面设有LED光源,使棒状的光从与配置有LED光源的端面(入射端面)对置的端面出射。所述照明器具为了提高出射效率,必须利用导光板主面的全反射来导光,因而以往以使导光板外露的方式构成的情况较多。然而,以所述方式构成的导光板容易被尘埃、指纹等污染,存在附着于导光板的污垢阻碍光的全反射的问题产生。另外,在导光板设置防污层时,会有该层阻碍导光的全反射的问题产生。另外,在导光板的主面配置膜(例如保护膜、设计膜)时,会使主面的全反射带来的导光不足,从而出射强度降低。
现有技术文献
专利文献
专利文献1:日本特开2017-47677号公报
发明内容
发明所要解决的问题
本发明的课题在于,提供在导光板的一端面设有LED光源且使光从与配置有LED光源的端面(入射端面)对置的端面出射的照明器具中,可以抑制光的波导效率降低、并且可以在导光单元的表面和/或背面层叠任意膜或实施任意表面处理的LED照明器具用膜;并且提供具备该LED照明器具用膜的LED照明器具。
解决问题的方法
本发明的LED照明器具用膜具备:基材、和配置于该基材的至少一侧的低折射率层,该低折射率层的折射率为1.25以下。
在一实施方式中,上述低折射率层为空隙层。
在一实施方式中,上述低折射率层的空隙率为35体积%以下。
根据本发明的另一方面,提供一种LED照明器具。该LED照明器具具备:导光板、和配置于导光板的至少一侧的低折射率层。
在一实施方式中,上述LED照明器具具备:导光单元,其由导光板、和配置于该导光板的至少一面的LED照明器具用膜构成;以及LED光源,其配置于该导光板的一端面,该LED照明器具用膜为上述LED照明器具用膜,该LED照明器具用膜以使上述低折射率层比上述基材更靠近内侧的方式直接配置于导光板。
在一实施方式中,上述导光板的折射率与上述低折射率层的折射率之差为0.2以上。
发明的效果
本发明的LED照明器具用膜具备折射率在1.25以下的低折射率层。如果使用该LED照明器具用膜,则可以提供一种在导光板的一端面设有LED光源且使棒状的光从与配置有LED光源的端面(入射端面)对置的端面出射的照明器具中,可以抑制光的波导效率降低、并且可以在导光单元的表面和/或背面层叠任意膜或实施任意表面处理的LED照明器具用膜;以及具备该LED照明器具用膜的LED照明器具。
附图说明
图1是本发明的一实施方式的LED照明器具用膜的示意截面图。
图2是本发明的一实施方式的具备LED照明器具用膜的LED照明器具的示意截面图。
符号说明
10 基材
20 低折射率层
30 粘接层
40 LED光源
110 LED照明器具用膜
120 导光板
200 LED照明器具
具体实施方式
A.LED照明器具用膜
A-1.LED照明器具用膜的概要
图1是本发明的一实施方式的LED照明器具用膜的示意截面图。该实施方式的LED照明器具用膜110具备:基材10、和配置于基材10的至少一侧的低折射率层20。低折射率层20的折射率为1.25以下。LED照明器具用膜100可以根据需要在低折射率层20的与基材10相反侧进一步具备粘接层30。优选LED照明器具用膜110在低折射率层20的与基材10相反侧不具有除粘接层30以外的层。虽未图示,但本发明的LED照明器具用膜也可以根据需要在基材的与低折射率层相反侧进一步具备粘接层。另外,本发明的LED照明器具用膜也可以出于在供于使用前的期间保护粘接面的目的,在粘接层外侧设置剥离衬材。本说明书中,粘接层是指,包含粘合剂层及粘接剂层的概念。
图2是本发明的一实施方式的具备LED照明器具用膜的LED照明器具的示意截面图。LED照明器具200具备:导光单元100,其由导光板120、和配置于导光板120的至少一面(在图式例中为两面)的LED照明器具用膜110构成;以及LED光源40,其配置于导光板210的一端面(与LED照明器具用膜110大致正交的面)。LED照明器具200以LED为光源,并隔着导光板120照射光,从而进行照明。更详细而言,LED照明器具200在导光板120的一端面121设置有LED光源40,使光从与配置有LED光源40的端面121(以下也称为入射端面)对置的端面122(以下也称为出射端面)以与端面形状相应的形状出射。虽未图示,但也可以在出射端面设置光扩散板等用于使出射光扩散的构件。另外,出射端面的形状并无特别限定,除图式例以外,还可以是相对于对LED照明器具用膜倾斜的倾斜面,也可以是凹凸面。LED照明器具用膜100优选以使低折射率层20比基材10更靠近内侧(导光板侧)的方式直接配置。代表性地,导光单元100为平板状。在一实施方式中,平板状的导光单元100也可以根据要求的光的出射方向使其部分弯曲而使用。
如果如上所述地使用本发明的LED照明器具用膜,则可以得到一种LED照明器具,其可以在导光板与LED照明器具用膜的界面使光良好地反射,光的波导效率优异,从出射端面出射的出射强度优异。另外,由于可以在导光板与LED照明器具用膜的界面使光良好地反射,因此可以得到无论LED照明器具用膜的与导光板相反侧的面状况如何、光的波导效率都良好的LED照明器具。具体而言,上述LED照明器具即使是在导光单元的外侧(实质上为LED照明器具用膜的外侧)有污垢附着时,光的波导效率也不会降低。另外,上述LED照明器具即使是在导光单元的外侧进一步配置有设计膜等任意适当的膜时,光的波导效率也不会降低。并且,即使是在对导光单元的外侧实施过防污处理等表面处理时,光的波导效率也不会降低。
A-2.低折射率层
如上所述,低折射率层的折射率为1.25以下。如果将具备具有所述折射率的低折射率层的LED照明器具用膜层叠于导光板,则可以得到可以在导光板与LED照明器具用膜的界面使光良好地反射、光的波导效率优异、且从出射端面的出射强度优异的LED照明器具。低折射率层的折射率优选为1.23以下,更优选为1.20以下,进一步优选为1.18以下,特别优选为1.15以下。低折射率层的折射率越低越好,但其下限例如为1.07以上(优选为1.05以上)。在本说明书中,折射率是指在波长550nm下测定的折射率。
上述低折射率层的厚度优选为0.01μm~1000μm,更优选为0.05μm~100μm,进一步优选为0.1μm~80μm,特别优选为0.3μm~50μm。
上述低折射率层只要折射率在上述范围内,就可以是任意适当的方式。在一实施方式中,低折射率层以具有给定的空隙的空隙层的方式构成。
具有空隙的低折射率层的空隙率优选为35体积%以上,更优选为38体积%以上,特别优选为40体积%以上。如果为所述范围,则可以形成折射率特别低的低折射率层。低折射率层空隙率的上限例如为90体积%以下,优选为75体积%以下。如果为所述范围,则可以形成强度优异的低折射率层。成为空隙率的测定对象的层如果是单一层且包含空隙,则层的构成物质与空气的比率(体积比)可以利用常规方法(例如测定重量及体积来算出密度)算出,由此可以算出空隙率(体积%)。另外,折射率与空隙率具有相关关系,所以例如也可以根据层的形态的折射率的值算出空隙率。具体而言,例如可以根据用椭圆偏光计测定折射率的值,利用劳洛公式(Lorentz-Lorenz's formula)算出空隙率。
上述空隙的尺寸优选为2nm~500nm,更优选为5nm~500nm,进一步优选为10nm~200nm,特别优选为20nm~100nm。空隙的尺寸可以利用BET试验法测定。具体而言,可以在比表面积测定装置(Micromeritics公司制的商品名“ASAP 2020”)的毛细管中,投入低折射率层样品0.1g后,在室温下进行24小时的干燥减压,使空隙结构内的气体脱气,然后使低折射率层样品吸附氮气而获得细孔分布,根据细孔分布评价空隙尺寸。
具有空隙的低折射率层的峰值细孔径优选为5nm~50nm,更优选为10nm~40nm,进一步优选为20nm~30nm。峰值细孔径使用细孔分布/比表面积测定装置(MicrotracBEL公司的商品名“BELLSORP MINI”),根据利用氮吸附得到的BJH曲线、BET曲线及等温吸附线而求出。
具有空隙的低折射率层例如包含硅酮粒子、具有微细孔的硅酮粒子、二氧化硅中空纳米粒子等大致球状粒子、纤维素纳米纤维、氧化铝纳米纤维、二氧化硅纳米纤维等纤维状粒子、由膨润土构成的纳米粘土等平板状粒子等。在一实施方式中,具有空隙的低折射率层是粒子彼此化学键合而构成的多孔体。另外,具有空隙的低折射率层的粒子彼此也可以至少一部分通过少量粘合剂成分(例如粒子重量以下的粘合剂成分)键合。具有空隙的低折射率层的空隙率及折射率可以通过构成该低折射率层的粒子的粒径、粒径分布等来调整。
得到具有空隙的低折射率层的方法可列举例如记载于日本特开2010-189212号公报、日本特开2008-040171号公报、日本特开2006-011175号公报、国际公开第2004/113966号公报小册子及它们的参考文献中的方法。具体而言可列举以下方法:使二氧化硅系化合物、水解性硅烷类以及其部分水解物及脱水缩合物中的至少任一者水解及聚合缩合的方法;使用多孔质粒子和/或中空微粒子的方法;以及利用弹回现象(spring back)生成气凝胶层的方法;使用粉碎凝胶的方法,该粉碎凝胶是将通过溶胶-凝胶法得到的凝胶粉碎、并用催化剂等使上述粉碎液中的微细孔粒子彼此化学键合而成的。然而,低折射率层并不限定于该制造方法,可使用任何制造方法来制造。
优选具有空隙的低折射率层为硅酮多孔体。硅酮多孔体可由相互键合的硅化合物的微细孔粒子构成。作为硅化合物的微细孔粒子,可举出凝胶状硅化合物的粉碎物。硅酮多孔体例如可以将含有凝胶状硅化合物的粉碎物的涂敷液涂敷至基材而形成。在一实施方式中,凝胶状硅化合物的粉碎物例如可以利用催化剂的作用、光照射、加热等来进行化学键合(例如硅氧烷键)。
作为硅化合物,可列举例如下述式(1)所示化合物。
[化学式1]
式(1)中,X为2、3或4。R1优选为碳原子数1~6的直链状或支链状烷基,更优选为碳原子数1~4的直链状或支链状烷基,进一步优选为碳原子数1~2的烷基。R2优选为氢原子或者碳原子数1~6的直链状或支链状烷基,更优选为氢原子或者碳原子数1~4的直链状或支链状烷基,进一步优选为氢原子或碳原子数1~2的烷基。
作为上述硅化合物的具体例,可列举例如三(羟)甲基硅烷、三甲氧基(甲基)硅烷等。
在一实施方式中,硅化合物是3官能硅烷。如果使用3官能硅烷,则可以形成折射率特别低的低折射率层。在另一实施方式中,硅化合物为4官能硅烷。如果使用4官能硅烷,则可以形成耐擦伤性优异的低折射率层。
硅化合物的凝胶化可以通过例如硅化合物的脱水缩合反应来进行。脱水缩合反应的方法可采用任意适当的方法。
凝胶状硅化合物的粉碎方法可采用任意适当的方法。粉碎方法可列举例如使用超声波均质机、高速旋转均质机等利用空蚀现象的粉碎装置的方法。
硅化合物的微细孔粒子(凝胶状硅化合物的粉碎物)的体积平均粒径优选为0.1μm~2μm,更优选为0.2μm~1.5μm,进一步优选为0.4μm~1μm。体积平均粒径可以利用动态光散射法测定。
作为硅化合物的微细孔粒子(凝胶状硅化合物的粉碎物)的粒度分布,粒径0.4μm~1μm的粒子相对于粒子总量的比率优选为50重量%~99.9重量%,更优选为80重量%~99.8重量%,进一步优选为90重量%~99.7重量%。另外,粒径1μm~2μm的粒子相对于粒子总量的比率优选为0.1重量%~50重量%,更优选为0.2重量%~20重量%,进一步优选为0.3重量%~10重量%。粒度分布可以利用粒度分布评价装置测定。
A-3.基材
上述基材可以由任意适当的材料形成。构成基材的材料可列举例如聚对苯二甲酸乙二醇酯系树脂、丙烯酸系树脂、纤维素系树脂、环烯烃系树脂、烯烃系树脂等热塑性树脂;热固化性树脂;玻璃、硅等无机材料;碳纤维材料等。
上述基材的厚度并无特别限定,可根据用途设定成任意适当的厚度。基材的厚度例如为1μm~1000μm。
A-4.粘接层
粘接层包含任意适当的粘合剂或粘接剂。粘合剂及粘接剂优选具有透明性及光学各向同性。作为粘合剂的具体例,可列举橡胶系粘合剂、丙烯酸系粘合剂、硅酮系粘合剂、环氧系粘合剂、纤维素系粘合剂。优选橡胶系粘合剂或丙烯酸系粘合剂。作为粘接剂的具体例,可列举橡胶系粘接剂、丙烯酸系粘接剂、硅酮系粘接剂、环氧系粘接剂、纤维素系粘接剂。此外,也可使用由戊二醛、三聚氰胺、草酸等乙烯醇系聚合物的水溶性交联剂等构成的粘合剂或粘接剂。
粘接层的厚度优选为0.1μm~100μm,更优选为5μm~50μm,进一步优选为10μm~30μm。
粘接层的折射率优选为1.42~1.60,更优选为1.47~1.58。如果在所述范围内,则可得到的波导效率优异、且从出射端面的出射强度优异的LED照明器具。
A-5.LED照明器具用膜的制造方法
LED照明器具用膜可以利用任意适当的方法制造。例如可以将含有给定粒子(例如硅化合物的微细孔粒子,优选为凝胶状硅化合物的粉碎物)的涂敷液涂布至上述基材上并使其干燥,由此得到由基材与低折射率层构成的LED照明器具用膜。
上述涂敷液包含任意适当的溶剂。作为溶剂,可列举例如异丙醇、乙醇、甲醇、正丁醇、2-丁醇、异丁醇、戊醇等。
在一实施方式中,上述低涂敷液进一步包含催化剂。作为催化剂,使用可促进粒子的化学键合的催化剂。例如,在使用硅化合物的微细孔粒子作为该粒子时,使用可促进硅化合物的硅醇基的脱水缩合反应的催化剂。催化剂可列举例如氢氧化钾、氢氧化钠、氢氧化铵等碱性催化剂、盐酸、乙酸、草酸等酸催化剂等。其中,优选碱性催化剂。催化剂的含有比率相对于涂敷液中的粒子100重量份,优选为0.01重量份~20重量份,更优选为0.1重量份~5重量份。
涂敷液的涂布方法可采用任意适当的方法。涂布方法可列举例如棒涂、气刀涂布、凹版涂布、凹版逆向涂布、逆辊涂布、唇涂、模涂、浸涂等。
涂敷液的干燥方法可采用任意适当的方法。涂敷液的干燥方法可以为自然干燥,可以为加热干燥,也可以为减压干燥。加热机构可列举例如热风器、加热辊、远红外线加热器等。
LED照明器具用膜的制造方法也可以包含加热步骤。可以通过加热步骤来促进构成低折射率层的粒子彼此键合。例如,在使用硅化合物的微细孔粒子作为该粒子时,加热温度优选为200℃以上。另外,上述干燥步骤也可以同时作为加热步骤。
包含低折射率层的膜的制造方法的详细内容例如记载于日本特开2017-47677号公报中。本说明书中援用该公报的记载作为参考。
B.LED照明器具
本发明的实施方式的LED照明器具具备:导光板、和配置于导光板的至少一侧的低折射率层。在一实施方式中,将上述LED照明器具用膜层叠于导光板,从而提供具备低折射率层的LED照明器具。在该实施方式中,如图2所示,LED照明器具200具备:导光单元100,其由导光板120、和配置于导光板120的至少一面(在图式例中为两面)的LED照明器具用膜110构成;以及LED光源40,其配置于导光板210的一端面(与LED照明器具用膜110大致正交的面)。LED照明器具用膜100优选以使低折射率层20比基材10更靠近内侧(导光板侧)的方式直接配置于导光板。另外,“直接配置”是指,以不在LED照明器具用膜100与导光板210之间配置其它层的方式配置LED照明器具用膜100和导光板210。LED照明器具也可以进一步具备任意适当的其它构件。例如也可以在出射端面设置光扩散板等用于使出射光扩散的构件。
构成导光板的材料只要可以高效地引导从LED光源照出射的光,就可以使用任意适当的材料。作为构成导光板的材料,可列举例如丙烯酸系树脂、聚碳酸酯系树脂、环烯烃系树脂等。导光板的厚度例如为100μm~1000μm。导光板的出射端面的形状并无特别限定,除图式例以外,还可以为相对于LED照明器具用膜倾斜的倾斜面,也可以为凹凸面。
导光板的折射率优选为1.4以上,更优选为大于1.45,进一步优选为大于1.45且2以下,特别优选为1.48~1.8。
导光板的折射率与低折射率层的折射率层之差优选为0.2以上,更优选为0.23以上,进一步优选为0.25以上。如果在所述范围内,则可以得到可以在导光板与LED照明器具用膜的界面使光良好地反射、光的波导效率优异、且从出射端面的出射强度优异的LED照明器具。此外,通常导光板的折射率比低折射率层的折射率高。
实施例
以下,通过实施例具体说明本发明,但本发明不受这些实施例限定。实施例及比较例中的评价方法如下。另外,只要没有特别明确记载,“份”及“%”为重量基准。
<评价方法>
(1)折射率
将折射率层裁切成50mm×50mm的尺寸,通过粘合层将其贴合于玻璃板(厚度:3mm)的表面。将上述玻璃板的背面中央部(直径20mm左右)用黑色马克笔涂黑,制成不会在该玻璃板的背面反射的样品。将上述样品安装于椭圆偏光仪(J.A.Woollam Japan公司制:VASE)上,在波长500nm且入射角50~80度的条件下测定折射率。
(2)空隙率
根据用椭圆偏光计测定折射率的值,利用劳洛公式(Lorentz-Lorenz'sformula)算出空隙率。
(3)从导光板出射的出射光强度相对于对导光板入射的入射光强度之比
使用分光放射计SR-UL2(TOPCON TECHNOHOUSE公司制),求出使光进入导光板前的LED单独的亮度测定结果(入射光强度)与从LED使光进入导光板后从导光板的终端出射的出射光的亮度测定结果(出射光亮度)之比。
[制造例1]低折射率层形成用涂敷液的制备
(1)硅化合物的凝胶化
将硅化合物的前体MTMS 0.95g溶解至2.2g的DMSO中,制备混合液A。在该混合液A中添加0.5g的0.01mol/L的草酸水溶液后,在室温下进行30分钟的搅拌,使MTMS水解,生成含三(羟)甲基硅烷的混合液B。
在5.5g的DMSO中添加28重量%的氨水0.38g及纯水0.2g后,再添加上述混合液B,并在室温下搅拌15分钟进行三(羟)甲基硅烷的凝胶化,获得含凝胶状硅化合物的混合液C。
(2)熟化处理
将如上所述地制备的含凝胶状硅化合物的混合液C直接在40℃下培养20小时,进行熟化处理。
(3)粉碎处理
接下来,用刮勺将如上所述地熟化处理后的凝胶状硅化合物碾碎成数mm~数cm尺寸的颗粒状。接着,在混合液C中添加IBA 40g并轻微搅拌后,在室温下静置6小时,再将凝胶中的溶剂及催化剂倾析。进行3次相同的倾析处理,进行溶剂置换,得到混合液D。接着,将混合液D中的凝胶状硅化合物进行粉碎处理(高压无介质粉碎)。粉碎处理(高压无介质粉碎)使用均质机(SMT Corporation制的商品名“UH-50”),在5cc的旋盖瓶中秤量混合液D’中的凝胶状化合物1.85g及IBA 1.15g后,在50W、20kHz的条件下进行2分钟的粉碎。
通过该粉碎处理使上述混合液D中的凝胶状硅化合物粉碎,该混合液D’成为粉碎物的溶胶液。用动态光散射式NANOTRAC粒度分析计(日机装公司制、UPA-EX150型)确认表示混合液D’中所含的粉碎物的粒度偏差的体积平均粒径,结果为0.50~0.70。进一步相对于该溶胶液(混合液C’)0.75g,以光致产碱剂(和光纯药工业株式会社:商品名WPBG 266)的1.5重量%浓度MEK(甲乙酮)溶液0.062g、双(三甲氧基甲硅烷基)乙烷的5%浓度MEK溶液0.036g的比率进行添加,得到低折射率层用涂敷液。
[制造例2]粘合层的制作
在具备搅拌叶片、温度计、氮气导入管、冷凝器的四颈烧瓶中,将丙烯酸丁酯90.7份、N-丙烯酰基吗啉6份、丙烯酸3份、丙烯酸2-羟基丁酯0.3份、作为聚合引发剂的2,2’-偶氮双异丁腈0.1重量份与乙酸乙酯100g一起加入,一边缓慢地搅拌一边导入氮气进行氮气置换后,将烧瓶内的液温保持在55℃左右,进行8小时的聚合反应,制备了丙烯酸系聚合物溶液。相对于得到的丙烯酸系聚合物溶液的固体成分100份,配合异氰酸酯交联剂(NipponPolyurethane Industry Co.,Ltd.制的Coronate L,三羟甲基丙烷的二异氰酸甲苯酯的加合物)0.2份、过氧化苯甲酰(日本油脂公司制的NYPER BMT)0.3份、γ-环氧丙氧基丙基甲氧基硅烷(信越化学工业公司制:KBM-403)0.2份,制备了丙烯酸系粘合剂溶液。接着,以使干燥后的粘合剂层的厚度成为10μm的方式,将上述丙烯酸系粘合剂溶液涂布于经硅酮处理后的聚对苯二甲酸乙二醇酯(PET)膜(三菱化学聚酯膜公司制,厚度:38μm)的一面上,在150℃下干燥3分钟,形成粘合剂层。
[实施例1]
将制造例1中制备的低折射率层用涂敷液涂敷至作为基材的丙烯酸系树脂膜(厚度:20μm)并使其干燥,得到在基材的一面配置有厚度850nm的低折射率层(折射率:1.18)的层叠体。对低折射率层照射UV(300mJ)后,将制造例2的粘合剂层转印至低折射率层上,并在60℃下进行20小时的老化,得到LED照明器具用膜(基材/低折射率层/粘合剂层)。
在具备导光板、和配置于该导光板的一端面的LED光源的市售的LED设计照明的导光板(亚克力导光板,折射率:1.49)的两面,直接贴合得到的LED照明器具用膜。进一步在LED照明器具用膜的与导光板相反侧贴合黑色的PET膜,得到LED照明器具。对于该LED照明器具,利用上述评价方法(3)评价点亮LED光源时、从导光板出射的出射光强度相对于对导光板入射的入射光强度之比。将结果示于表1。
[比较例1]
在与实施例1中使用的LED设计照明同样的LED设计照明的导光板直接贴合黑色的PET膜,得到LED照明器具。对于该LED照明器具,利用上述评价方法(3)评价点亮LED光源时、从导光板出射的出射光强度相对于对导光板入射的入射光强度之比。将结果示于表1。
[比较例2]
在与实施例1中使用的LED设计照明同样的LED设计照明的导光板利用氟系化合物(AGC SEIMI CHEMICAL公司制,商品名“SFcoat”)进行防污处理,得到LED照明器具。对于该LED照明器具,利用上述评价方法(3)评价点亮LED光源时、从导光板出射的出射光强度相对于对导光板入射的入射光强度之比。将结果示于表1。
[表1]
根据表1可以明确得知,如果使用本发明的LED照明器具用膜,则可以得到可高效地引导入射光的导光单元。
Claims (8)
1.一种LED照明器具用膜,其具备:基材、和配置于该基材的至少一侧的低折射率层,
该低折射率层的折射率为1.25以下,
该低折射率层为空隙层,并且是粒子彼此化学键合而构成的多孔体。
2.根据权利要求1所述的LED照明器具用膜,其中,
所述低折射率层的空隙率为35体积%以上。
3.一种层叠体,其具备导光单元,该导光单元由导光板、和配置于导光板的至少一面的膜构成,
该膜具备基材、和配置于该基材的至少一侧的低折射率层,
该低折射率层的折射率为1.25以下,
该低折射率层为空隙层,并且是粒子彼此化学键合而构成的多孔体,
所述导光板的折射率与所述低折射率层的折射率之差为0.2以上。
4.根据权利要求1或2所述的LED照明器具用膜,其中,
所述粒子为微细孔粒子。
5.根据权利要求4所述的LED照明器具用膜,其中,
所述粒子为硅化合物的微细孔粒子。
6.根据权利要求1或2所述的LED照明器具用膜,其中,
所述低折射率层配置于所述基材的一侧,
该基材的与低折射率层相反侧的面为表面处理面。
7.根据权利要求3所述的层叠体,其中,
所述导光单元的外侧被实施了表面处理。
8.根据权利要求3所述的层叠体,其中,
以使低折射率层成为比基材更靠近导光板侧的方式配置所述膜,
所述导光单元的与所述导光板相反侧的面为表面处理面。
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CN102648427A (zh) * | 2009-12-08 | 2012-08-22 | 3M创新有限公司 | 采用光导和低折射率膜的光学构造 |
JP2011207751A (ja) * | 2010-03-11 | 2011-10-20 | Mitsubishi Chemicals Corp | シリカ系多孔質膜の製造方法 |
CN104950374A (zh) * | 2014-03-31 | 2015-09-30 | 日东电工株式会社 | 光学部件、偏光板装置和液晶显示装置 |
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US20200348462A1 (en) | 2020-11-05 |
JP6740490B2 (ja) | 2020-08-12 |
KR20200115507A (ko) | 2020-10-07 |
CN111656085A (zh) | 2020-09-11 |
JPWO2019146628A1 (ja) | 2020-07-30 |
TWI825064B (zh) | 2023-12-11 |
EP3745015A1 (en) | 2020-12-02 |
TW201937102A (zh) | 2019-09-16 |
EP3745015A4 (en) | 2021-07-21 |
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