公开(公告)号：US5198930A

公开(公告)日：1993-03-30

申请号：US744600

申请日：1991-08-12

申请人： Keiji Muratomi

发明人： Keiji Muratomi

IPC分类号： G02B5/28 ,  G02B27/14

CPC分类号： G02B5/285 ,  G02B27/142 ,  G02B27/144

摘要： The operable wavelength band of a wide-band half-mirror is windened by inserting, between (1) a substrate having index of refraction n.sub.sub and (2) layers with indices of refraction (n.sub.H .multidot.n.sub.L).sup.2 of the known four-film type dielectric half mirror having a construction represented by n.sub.sub /(n.sub.H .multidot.n.sub.L).sup.2 /air; alternating layers of: (a) high refractive index dielectric substances n.sub.H1, n.sub.H2 . . . ; and (b) low refractive index dielectric substances n.sub.L1, n.sub.L2 . . . ; each film having a thickness of .lambda..sub.o /2. The alternating layers to be inserted have indices of refraction related as follows:n.sub.sub .ltoreq.n.sub.H1 .ltoreq.n.sub.H2 .ltoreq.. . . .ltoreq.n.sub.HN andn.sub.sub .gtoreq.n.sub.L1 .gtoreq.L.sub.L2 .gtoreq.. . . .gtoreq.n.sub.LNThe alternating layer structures according to one of the following formulas (1) or (2) are inserted between the substrate n.sub.sub and layers (n.sub.H .multidot.n.sub.L).sup.2.(2n.sub.H1 .multidot.2n.sub.L1 .multidot.2n.sub.H2 .multidot.2n.sub.L2 .multidot.. . . 2n.sub.H(N-1) .multidot.2n.sub.L(N-1)) Formula (1)(2n.sub.L1 .multidot.2n.sub.H1 .multidot.2n.sub.L2 .multidot.2n.sub.H2 .multidot.. . . 2n.sub.H(N-2) .multidot.2n.sub.L(N-1)) Formula (2)The alternating layer structure defined by Formula (1) has a layer 2n.sub.H1 closest to the substrate, while the alternating layer structure defined by Formula (2) has a layer 2n.sub.L1 closest to the substrate.

摘要翻译： 通过在（1）具有折射率nsub的衬底和（2）具有已知四膜型电介质半体的折射率（nHxnL）2的层之间插入宽带半透半反镜的可操作波长带， 具有由nsub /（nHxnL）2 /空气表示的构造的反射镜; 交替层：（a）高折射率介电物质nH1，nH2。 。 。 ; 和（b）低折射率介电物质nL1，nL2。 。 。 ; 每个膜具有λo / 2的厚度。 要插入的交替层具有如下相关的折射率：nsub / = nL1> / = LL2> / =。 。 。 > / = nLN根据下式（1）或（2）之一的交替层结构插入在衬底nsub和层（nHxnL）2之间。 （2nH1x2nL1x2nH2x2nL2x ... 2nH（N-1）x2nL（N-1））式（1）（2nL1x2nH1x2nL2x2nH2x ... 2nH（N-2）x2nL（N-1））式（2） 式（1）具有最靠近衬底的层2nH1，而由式（2）定义的交替层结构具有最靠近衬底的层2nL1。

公开(公告)号：US4997241A

公开(公告)日：1991-03-05

申请号：US431186

申请日：1989-11-03

申请人： Keiji Muratomi

发明人： Keiji Muratomi

IPC分类号： G02B1/11 ,  G02B1/115 ,  G02B5/28

CPC分类号： G02B1/115 ,  G02B5/285

摘要： A multi-layered antireflection film preventing reflection at two wavelength regions has a substrate of a refractive index n.sub.sub and a 5-layered structured formed on the substrate and composed of a first layer group including three layers of n.sub.1 (.lambda..sub.1 /4)-n.sub.2 (.lambda..sub.2 /2)-n.sub.3 (.lambda..sub.1 /4) and a second layer group including two layers of n.sub.4 (.lambda..sub.1 /4)-n.sub.5 (.lambda..sub.1 /4). The factors are determined such that the following conditions are met:1

摘要翻译： 防止在两个波长区域反射的多层防反射膜具有在基板上形成的由折射率nsub和5层结构构成的基板，由包含三层n1（λ1/ 4）-n2 （λ2/2）-n 3（λ1/4）和包括n4（λ1/ 4）-n5（λ1/ 4）两层的第二层组。 确定因素使得满足以下条件：1 / = nsub 1