CN110856440A - 制造具有偏振选择性涂层的复合玻璃板的方法 - Google Patents

制造具有偏振选择性涂层的复合玻璃板的方法 Download PDF

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CN110856440A
CN110856440A CN201980001743.1A CN201980001743A CN110856440A CN 110856440 A CN110856440 A CN 110856440A CN 201980001743 A CN201980001743 A CN 201980001743A CN 110856440 A CN110856440 A CN 110856440A
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film
polarization
coating
selective coating
glass plate
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M.阿尔恩特
M.卡普奇利
A-O.基兹马茨
H.施托费尔
U.范德默伦
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Saint Gobain Glass France SAS
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Abstract

本发明涉及制造复合玻璃板(10)的方法,所述复合玻璃板适合作为投影装置的投影面,其中:(a)在载体薄膜(4)上提供偏振选择性涂层(5);(b)通过以下方式将偏振选择性涂层(5)从载体薄膜(4)转移到连接薄膜(3)上,(i)将载体薄膜(4)和连接薄膜(3)与位于其间的涂层(5)平面地彼此相叠地布置成薄膜堆叠,(ii)将所述薄膜堆叠在压热器(20)中在至少8巴的压力和80℃至120℃的温度下处理至少2小时,和(iii)将载体薄膜(4)从连接薄膜(3)上剥离,其中涂层(5)保留在连接薄膜(3)上;(c)将连接薄膜(3)平面地布置在第一玻璃板(1)和第二玻璃板(2)之间;和(d)将第一玻璃板(1)与第二玻璃板(2)通过连接薄膜(3)层压成复合玻璃板(10)。

Description

制造具有偏振选择性涂层的复合玻璃板的方法
本发明涉及制造复合玻璃板的方法,所述复合玻璃板适合作为投影装置的投影面,以及涉及制造这种投影装置的方法。
现代汽车越来越多地配备所谓的平视显示器(HUD)。用投影仪,例如在仪表板的区域中或者在车顶区域中,将图像投影到挡风玻璃上,在那里被反射并且被驾驶员感知为(从他看来)在挡风玻璃后面的虚拟图像。如此,可以将重要信息,例如驾驶员可以感知的当前的驾驶速度、导航-或警告通知,投影到驾驶员的视野中,而不必使他的视线转离道路。平视显示器因此可以为提高交通安全性做出显著贡献。
在最常见的HUD中,挡风玻璃被s偏振的辐射照射,该辐射被玻璃表面高度反射。在此产生投影仪图像在挡风玻璃的两个表面处被反射的问题。由此,驾驶员不仅感知到所希望的主图像,而且也感知到略微错位的副图像。后者通常也被称为重影图像。该问题通常通过以下方式来解决,即,将反射表面彼此以有意识地选择的角度来布置,从而使得主图像和重影图像重叠,由此重影图像不再干扰性地引人注目。挡风玻璃设计为复合玻璃板,并且该角度最简单地通过使用楔形的热塑性中间层被引入两个玻璃制玻璃板之间。例如由EP1800855B1或EP1880243A2已知具有楔形薄膜的用于平视显示器的复合玻璃。
替代地,也已知HUD,其中挡风玻璃被p偏振的辐射照射。因为典型的入射角接近空气-玻璃过渡的布鲁斯特角,所以p偏振的辐射不会被玻璃表面显著地反射并且由此避免了重影图像的问题。取而代之地,提供反射薄膜作为辐射所需的反射面,该反射薄膜例如层压在复合玻璃板的中间层中。这种HUD例如由US2004135742A1已知。反射薄膜尤其应有效地反射p偏振的辐射,并且为了改善光学品质,仅在小的程度上反射s偏振的辐射,因此偏振选择性涂层尤其适用于该反射薄膜。
由US2010157426A1已知一种偏振选择性涂层以及一种如何能够将该涂层引入到复合玻璃板中的方法。将该涂层提供在载体薄膜上,然后转移到层压在两个玻璃制玻璃板之间的连接薄膜上。在涂层转移时,将载体薄膜用经涂覆的侧压入粘着层的中间层片下,其中,薄膜堆叠在50°的温度下用0.5 kg加载超过2小时。然而,已经表明,该方法仅导致在偏振选择性涂层和连接薄膜之间的相对弱的结合。如果要给挡风玻璃大面积地提供该涂层,这可能导致问题。另外,已经表明,该工艺的稳健性不足以在不对参数进行大的调整的情况下能够应用于各种类型和各种厚度的连接薄膜。
US2010157426A1的偏振选择性涂层包含棒状纳米颗粒(所谓的纳米小棒或纳米棒),其中偏振选择性反射行为通过小棒的取向来实现。偏振选择性涂层的替代实现基于胆甾族液晶,如其例如描述在JP4208990B2中。
因此,存在对制备具有偏振选择性涂层的复合玻璃板的改进的方法的需求。本发明的目的在于,提供这样的改进的方法。在此,尤其应将偏振选择性涂层可靠且稳定地从载体薄膜转移到连接薄膜上,并且所得到的复合玻璃板应具有高的光学品质。
根据本发明,本发明的目的通过根据权利要求1的方法来实现。优选的实施方案由从属权利要求得出。
根据本发明的方法用于制造复合玻璃板,其适合并提供作为投影装置的投影面。首先,在载体薄膜上提供偏振选择性涂层。随后,将偏振选择性涂层从载体薄膜转移到连接薄膜上。然后,将具有偏振选择性涂层的连接薄膜平面地布置在第一玻璃板和第二玻璃板之间。随后,将第一玻璃板与第二玻璃板通过连接薄膜层压成复合玻璃板。
偏振选择性涂层通常提供在不具有热熔粘合(Schmelzklebe)性质并因此不能用于将两个玻璃制玻璃板层压成复合玻璃板的载体薄膜上。在这种载体薄膜,尤其是由聚对苯二甲酸乙二醇酯(PET)制成的薄膜上,偏振选择性涂层也是商购可得的。原则上,虽然可以想到将载体薄膜层压在复合玻璃板的中间层中在两个热熔连接薄膜之间,但是已经发现这不能产生令人满意的结果:典型的载体薄膜的高刚性导致在用于运输工具应用的通常弯曲的复合玻璃板中的褶裥,使得其不满足光学要求。因此,需要将涂层从载体薄膜转移到可弯曲的并且可以用作连接玻璃制玻璃板的热熔粘合薄膜的连接薄膜上。
本发明的优点尤其在于将偏振选择性涂层从载体薄膜转移到连接薄膜上。根据本发明的方法在涂层和连接薄膜之间产生了强结合,由此尤其也可以实现对连接薄膜的大面积区域的涂覆。此外,不同类型和不同厚度的连接薄膜与该方法兼容。所述具有涂层的连接薄膜具有高的光学品质,并且经涂覆的连接薄膜适于用作高光学品质的复合玻璃板的热塑性中间薄膜。根据本发明制造的复合玻璃板满足了在运输工具领域中的挡风玻璃所提出的高要求,因此它们可以作为这样的玻璃板来使用。
根据本发明的偏振选择性涂层的转移通过以下方式进行
- 将载体薄膜和连接薄膜与位于其间的涂层平面地彼此相叠地布置成薄膜堆叠,
- 随后在压热器中在至少8巴的压力和80℃至120℃的温度下处理所述薄膜堆叠至少2小时,和
- 然后将载体薄膜从连接薄膜上剥离,其中涂层保留在连接薄膜上。
具有偏振选择性涂层的载体薄膜是商购可得的,例如成卷的或作为薄膜片。在载体薄膜上提供偏振选择性涂层的步骤优选从这种购买的卷或片出发并且包括以所希望的尺寸和形状修剪薄膜区段。在此,所希望的尺寸和形状理想地相应于随后要被提供偏振选择性涂层的连接薄膜的区域的尺寸和形状。然而,原则上,偏振选择性涂层也可以例如通过刷涂并干燥各向异性地实体的溶液和任选随后拉伸而施加到经剪切的载体薄膜上。
在将载体薄膜和连接薄膜布置成薄膜堆叠时,使偏振选择性涂层与连接薄膜接触。连接薄膜优选事先被修剪成所希望的尺寸和形状,其基本上相应于待连接的玻璃制玻璃板的尺寸和形状。然而,原则上也可以将涂层转移到连接薄膜的较大的区段上并且随后由所述较大的区段修剪所希望的尺寸和形状。
如果要给整个(修剪的)连接薄膜提供偏振选择性涂层,那么连接薄膜和载体薄膜优选一致并且完全重叠地彼此相叠地布置,从而使得连接薄膜的整个表面与涂层接触。替代地,载体薄膜也可以具有比连接薄膜更大的面积,在那里它部分地或环绕地突出超出连接薄膜的棱边。如此也实现了,连接薄膜的整个表面与涂层接触,并且可能可以实现连接薄膜上的涂层棱边的更好的品质,但是该过程与材料废品相关联。相反,如果仅要给连接薄膜的一个区域提供偏振选择性涂层,则被修剪的载体薄膜具有比被修剪的连接薄膜更小的面积,并且被如此放置在连接薄膜上,使得所述区域完全与涂层接触。
优选在净化室条件下对薄膜进行操作,即,将载体薄膜和连接薄膜布置成薄膜堆叠,并且优选也剪切薄膜,由此降低了尤其会损害外观品质的污染的危险。将本发明意义上的净化室条件理解为是指环境空气包含每立方米最多352000个尺寸自0.5μm起的颗粒的条件。净化室中的温度为优选15℃至25℃,相对空气湿度优选小于30%。
载体薄膜典型地由或基于热塑性材料制成,所述热塑性材料不具有热熔合性质。这尤其指在约130℃的典型层压温度下对玻璃表面的热熔合性质。优选地,载体薄膜包含或基本上由聚对苯二甲酸乙二醇酯(PET)组成,如其对于商购可得的载体薄膜而言也是常用的那样。载体薄膜优选具有30μm至500μm,特别优选50μm至200μm,例如约100μm的厚度。
连接薄膜典型地由或基于具有热熔合性质(在上述条件下)的热塑性材料制成。优选地,所述连接薄膜包含或基本上由聚乙烯醇缩丁醛(PVB)、乙烯乙酸乙烯酯(EVA)、聚氨酯(PU)或其混合物或共聚物或衍生物构成,优选PVB。这些材料常用于复合玻璃的层压。连接薄膜此外可以包含增塑剂、稳定剂、着色剂或其它添加剂。连接薄膜优选具有0.1 mm至2mm,特别优选0.3 mm至1 mm的厚度,例如约0.38 mm或0.76 mm的标准厚度。
商购可得的连接薄膜的两个表面典型地由于生产造成具有不同的粗糙度。因此,连接薄膜具有一个粗糙度较小的表面和一个粗糙度较高的相对置的表面。如果涂层与粗糙度较小的表面接触,则对于涂层在连接薄膜处的粘着而言是有利的。因此,在将载体薄膜和连接薄膜布置成层堆叠时,优选朝向载体薄膜(和涂层)的较小粗糙度的表面。具有较小粗糙度的表面优选具有小于25μm的平均粗糙度RZ和具有较高粗糙度的表面具有大于25μm的平均粗糙度RZ。具有较小粗糙度的表面特别优选具有5μm至20μm的平均粗糙度RZ,和具有较高粗糙度的表面特别优选具有30μm至50μm的平均粗糙度RZ
在压热器中处理薄膜堆叠,其中产生偏振选择性涂层与连接薄膜的结合。为了确保稳定的结合而不产生光学变形,工艺参数是重要的。特别地,温度不允许选择得过高,因为否则在涂层中会产生裂纹。根据本发明,温度为80℃至120℃,优选85℃至115℃,特别优选90℃至110℃,例如约100℃。根据本发明,压热器处理的持续时间为至少2小时,优选2小时至4小时,例如约2.5小时。根据本发明,在压热器中,给薄膜堆叠施加至少8巴的压力,优选8巴至15巴,例如约12巴。
在压热器处理期间,将薄膜堆叠优选布置在两个板(压板)之间,这两个板彼此挤压连接薄膜和载体薄膜。例如,这两个板可以通过螺钉相互连接,借助于螺钉可以调节它们的相互距离并且因此调节作用到薄膜叠堆上的压力。所述板例如可以由金属或塑料(如聚碳酸酯或PMMA)制成并且具有1 cm至4 cm的厚度。通过这些板确保了压热器中的压力均匀地分布在薄膜堆叠上。
在压热器中处理之前,优选将堆叠暴露在减压下,以从连接薄膜和玻璃板之间的中间空间中排出空气。这例如借助于本身已知的真空袋法或真空环法进行。
在压热器中连接之后,将载体薄膜从连接薄膜上剥离,其中,涂层保留在连接薄膜上。推荐从载体薄膜的一个角出发,然后以均匀的速度剥离载体薄膜,以确保连接薄膜上的涂层的尽可能高的光学品质。所述剥离在整体上应足够缓慢和小心地进行,以不在涂层上产生痕迹。
直接从压热器中取出之后薄膜堆叠可能还太热,以至于不能剥离载体薄膜而不损坏或损害光学品质。因此推荐,首先使薄膜叠堆冷却或者主动冷却。然而,过于强烈地冷却至室温也反过来对载体薄膜的剥离有害。在剥离载体薄膜时,薄膜堆叠应理想地具有30℃至65℃的温度。
如果将偏振选择性涂层转移到连接薄膜上,则能够使用所述偏振选择性涂层,以将第一和第二玻璃板相互连接成复合玻璃板。将第一玻璃板、连接薄膜和第二玻璃板平面地并且基本上一致地叠置布置并且随后在温度、压力或真空的作用下相互连接并由此层压成复合玻璃板。
在此,将连接薄膜和因此偏振选择性涂层如此布置在玻璃板之间并因此布置在之后的复合玻璃板中,使得它们显著反射p偏振射到复合玻璃板上的辐射。涂层对p偏振的辐射的反射率由此基本上最大化。因为连接薄膜必须与玻璃板一致地布置,并因此在其取向方面没有自由度(至少当连接薄膜已经被剪切时),所以在涂层从载体薄膜转移到连接薄膜上时,必须已经考虑涂层的取向。
层压又优选在压热器中进行。在此,温度也不应过高:在通常常用的约130℃的层压温度下,在偏振选择性涂层中可能出现裂纹。温度优选小于130℃,特别优选最高100℃。压热器处理的持续时间优选为2小时至4小时,例如约3小时。但是,替代地,原则上也可以使用本身已知的其它方法,如真空袋法、真空环法、轧延机法或真空层压机。
在一个实施方案中,可以在偏振选择性涂层上放上另一连接薄膜,使得复合玻璃板中的涂层布置在两个热塑性材料层之间,并且仿佛是被封装的。
替代地,可以使偏振选择性涂层与第一或第二玻璃板直接接触。这也是优选的,因为已经表明,由此可以减少涂层的波纹度(所谓的桔皮效应)。位于中间的涂层不会显著损害所涉及的玻璃板在连接薄膜处的粘着。根据本发明的具有偏振选择性涂层的连接薄膜优选是布置在玻璃板之间用于层压的唯一的薄膜,以至于制成的复合玻璃板的中间层仅由该连接薄膜来形成。
第一玻璃板和第二玻璃板优选由玻璃,尤其是钠钙玻璃构成。但原则上,所述玻璃板也可以由其它玻璃种类构成,如石英玻璃或硼硅酸盐玻璃,或者也可以由刚性的透明塑料,尤其是聚碳酸酯(PC)或聚甲基丙烯酸甲酯(PMMA)构成。用于第一和第二玻璃板的材料可以彼此独立地选择。因此例如可以考虑,将由钠钙玻璃制成的玻璃板与PC玻璃板层压成复合玻璃板。
因为复合玻璃板尤其设置为窗玻璃并且这种窗玻璃在窗开口中将内部空间,尤其运输工具的内部空间相对于外部环境分隔,所以第一和第二玻璃板也可被称为外玻璃板和内玻璃板。在此,内玻璃板表示复合玻璃板的朝向内部空间(运输工具内部空间)的玻璃板。外玻璃板表示朝向外部环境的玻璃板。偏振选择性涂层优选朝向内玻璃板。
复合玻璃板典型地沿着一个或多个空间方向弯曲,如其在运输工具领域中常见的那样。为此,第一和第二玻璃板在层合之前经受弯曲工艺,例如借助于重力弯曲、挤压弯曲和/或抽吸弯曲。玻璃弯曲工艺的典型温度例如为500℃至700℃。
玻璃板和连接薄膜可以彼此独立地为透明和无色的,但也可以是染色或着色的。在一个优选的实施方案中,穿过复合玻璃板的总透射率大于70%。术语总透射率涉及由ECE-R 43,附录3,§ 9.1所确定的用于检测机动车玻璃板的透光率的方法。
根据本发明的偏振选择性涂层可以以不同的方式来设计。偏振选择性涂层通常包含各向异性的颗粒或实体。在此,偏振选择性作用通过各向异性的实体的取向序来实现,其例如可以通过拉伸载体薄膜来调节。各向异性的颗粒或实体例如可以是金属纳米小棒(纳米棒),如在US2010157426A1中示例性地公开的。在一个优选的实施方案中,偏振选择性涂层包含液晶,特别是呈向列相的液晶,其中分子具有与所谓的导向偶极子(方向的单位矢量)相关的取向序。特别优选地,偏振选择性涂层包含呈胆甾相的液晶。胆甾相是向列相的一种特殊情况,其具有向列顺序,所述向列顺序具有连续旋转的优先取向。 在这种情况下产生超距的螺旋超结构。胆甾相尤其能够根据波长调节和优化涂层的反射性质。因此,可以产生涂层的反射谱,其中,选择性地反射特定的波长或特定的相对窄的波长范围,而其余的波长范围仅以非常小的程度被反射。因此,涂层可以根据照射它们以产生投影的波长来优化,由此避免由其他波长引起的干扰性反射。
在一个有利的实施方案中,如此调节涂层,以至于反射带覆盖了473 nm、550 nm和630 nm的波长。特别优选地,局部反射最大值位于这些波长处或附近,而在所述反射最小值或具有较低反射的平台之间。所给出的波长对应于用于在复合玻璃板上产生显示图像的典型的投影仪的颜色红色、绿色和蓝色(RGB),如其尤其对于HUD而言常见的那样。
连接薄膜可以在整个表面上具有偏振选择性涂层。替代地,连接薄膜的仅一个区域可以具有该涂层。在一个有利的实施方案中,第一玻璃板和/或第二玻璃板具有覆盖印刷物,在层压之后该覆盖印刷物遮蔽在通过复合玻璃板透视时偏振选择性涂层的侧棱边。这在连接薄膜的仅一个区域具有涂层时是特别有利的,因为在通过复合玻璃板透视时,涂层的侧棱边会干扰性地显得突出。优选地,在玻璃板中提供覆盖印刷物,使得侧棱边无论是从外还是从内都不能看到。覆盖印刷物对于运输工具玻璃板而言是常见的,并且通常由基本上不透明的搪瓷形成,搪瓷在层压之前被印刷到玻璃板上并且烧制,尤其以丝网印刷方法。
偏振选择性涂层至少布置在复合玻璃板的照射区域中,该照射区域提供用于被投影仪照射,以产生显示图像。
根据本发明制造的复合玻璃板优选提供作为运输工具玻璃板,尤其作为挡风玻璃。挡风玻璃具有中央视野,对其光学品质提出了高的要求。中央视野必须具有高的光透射率(典型地大于70%)。所述中央视野尤其是被本领域技术人员称为视野B、视域B或区域B的视野。视野B及其技术要求在联合国欧洲经济委员会(UN/ECE)的法规第43条(ECE-R43, „Einheitliche Bedingungen für die Genehmigung der Sicherheitsverglasungswerkstoffe und ihres Einbaus in Fahrzeuge“)中确定。在那里,视野B定义在附录18中。
在本发明的一个实施方案中,偏振选择性涂层基本上覆盖挡风玻璃的中央视野B。复合玻璃板可以,例如,在整个表面上具有涂层,或者在减去最多10cm宽的环绕的外周边缘区域后的整个表面上具有涂层,以保护涂层不与周围的大气接触。然后,涂层的侧棱边被对于挡风玻璃而言常见的环绕的外周覆盖印刷物覆盖。由此可以有利地实现所谓的接触模拟HUD或增强现实HUD(AR-HUD)。在接触模拟HUD的情况中,不仅信息被投影到挡风玻璃的受限区域上,而且外部环境的要素被包含到显示中。对此的实例是行人的标记、与前方行驶的运输工具的距离的显示或者直接在道路上的导航说明的投影,例如用于标记待选择的车道。接触模拟HUD由此与传统的静态HUD的区别在于,投影距离为至少5 m。在静态HUD中,投影距离明显更小,典型地约2 m。在本发明的意义上,投影距离是指虚拟图像和观察者,即,通常驾驶员的头部之间的距离。投影距离优选为至少7米。投影距离优选为至多15 m。
在本发明的另一实施方案中,将偏振选择性涂层布置在挡风玻璃的中央视野B之外。由此可以实现挡风玻璃边缘区域中的投影面,在该投影面中可以向观察者插入任意信息。这样的投影面可以例如用于娱乐或信息娱乐,例如观看电影、导航信息或者标记或评论周围的对象。在视野B之外,对于通过玻璃板的透视存在较低的要求,因此在此可布置覆盖印刷物,以遮蔽涂层的侧棱边。
根据本发明制造的复合玻璃板优选用作运输工具的窗玻璃,特别优选用作挡风玻璃。在此,所述复合玻璃板是投影装置的一部分并且用作投影面。投影装置包括复合玻璃板和投影仪,投影仪对准复合玻璃板的一个区域(投影区域)。投影装置可以提供用于HUD,尤其是AR-HUD,或者也可以提供用于显示任意其它的信息。
从根据本发明的复合玻璃板的制造出发,本发明还包括投影装置的制造,其包括按照根据本发明的方法制造复合玻璃板,和随后相对于复合玻璃板布置投影仪,从而可以照射偏振选择性涂层。尤其在将元件安装到运输工具中时,进行复合玻璃板和投影仪的相对布置。投影仪优选发射p偏振的辐射并且用其照射偏振选择性涂层。投影仪优选以60°至70°,尤其约65°的入射角(相对于面法线的角度)照射复合玻璃板,如其对于常见的HUD而言也是常见的。该入射角相对接近空气-玻璃过渡(57.2°,钠钙玻璃)的布鲁斯特角,使得p-偏振辐射几乎不从玻璃板表面反射。由此,能够最小化或者完全避免重影图像的出现。
下面借助于附图和实施例对本发明进行详细解释。附图是示意性的图示并且不是按比例的。附图不以任何方式限制本发明。
其中:
图1示出了在将偏振选择性涂层从载体薄膜转移到连接薄膜上期间通过载体薄膜和连接薄膜的横截面,
图2示出了通过根据本发明制造的复合玻璃板的横截面,
图3示出了通过根据本发明制造的投影装置的横截面,
图4示出了根据本发明制造的复合玻璃板的一个实施方案的俯视图,
图5示出了根据本发明制造的复合玻璃板的另一实施方案的俯视图,和
图6示出了根据本发明的制造复合玻璃板的方法的一个实施方式的流程图。
图1示出了在将偏振选择性涂层5从载体薄膜4转移到连接薄膜3上时在三个时间点时的横截面。偏振选择性涂层5例如包含呈胆甾相的液晶,并且被商业购得施加在由PET制成的载体薄膜4(厚度100μm)上。由于PET薄膜非常硬并且在典型的层压温度下对玻璃表面不具有热熔粘合性质,因此它不能用作复合玻璃板的中间层。因此,为了制造高光学品质的复合玻璃板,需要将涂层5转移到连接薄膜3上,例如厚度为0.76 mm的PVB薄膜。
在起始状态下,存在具有涂层5的载体薄膜4和未涂覆的连接薄膜3(部分a)。将载体薄膜4和连接薄膜3与位于其间的涂层5平面地彼此叠置地布置成薄膜堆叠,借助于第一压板21和第二压板22彼此挤压并且在压热器20中处理(部分b)。已经被剪切成其最终形状的薄膜4、3具有例如大约1.1m X 1.7 m的尺寸。合适的压热器工艺参数为12巴的压力,100℃的温度和2.5小时的处理持续时间。然后,将薄膜叠堆从压热器中取出,并使其冷却到例如40℃的温度。然后从一个角起始小心地剥离载体薄膜4,并且涂层5保留在连接薄膜3上(部分c)。如对于PVB薄膜常见的那样,连接薄膜3具有较高粗糙度的表面II和较小粗糙度的表面I。将涂层5施加到表面I上,由此实现更好的粘着。
图2示出了根据本发明制造的复合玻璃板10的横截面。其包括由钠钙玻璃制成的厚度为例如2.1mm的第一玻璃板1和由钠钙玻璃制成的厚度为例如1.6 mm的第二玻璃板2,它们经由具有偏振选择性涂层5的连接薄膜3彼此连接。涂层5在此指向第二玻璃板2。第一玻璃板1的朝向连接薄膜3的表面以及第二玻璃板2的背离连接薄膜3的表面具有环绕的外周覆盖印刷物6,如其对于运输工具的窗玻璃而言常见的那样。覆盖印刷物6遮蔽涂层5的侧棱边。
图3示出了作为投影装置的投影面的得自图2的复合玻璃板10的横截面。复合玻璃板10是机动车的挡风玻璃。在此,第一玻璃板1是外玻璃板,第二玻璃板2是内玻璃板。其被投影仪P用p偏振的辐射在约65°的角度下照射。p偏振的辐射几乎不被玻璃板1、2的表面反射,但是非常有效地被偏振选择性涂层5反射。由此产生投影,观察者O,例如运输工具的驾驶员可以感知该投影。
图4示出了根据本发明制造的复合玻璃板10的一个实施方案的俯视图。复合玻璃板10是机动车的挡风玻璃并且具有根据ECE-R43的视域B。它在减去宽度为几厘米的环绕的边缘区域的整个表面上具有偏振选择性涂层5。因此,涂层5完全覆盖视域B。涂层5的侧棱边在此被覆盖印刷物6隐蔽。该实施方案尤其适合作为用于接触模拟的增强现实HUD的投影面。投影可以在整个玻璃板上产生,并且可以将环境一起包括在显示中。因此例如可以这样投影箭头,使得该箭头看起来位于车道上并且其为驾驶员标记该车道。
图5示出了根据本发明制造的复合玻璃板10的另一实施方案的俯视图。复合玻璃板10同样是机动车的挡风玻璃并且具有根据ECE-R43的视域B。仅复合玻璃板10的相对较小的区域具有偏振选择性涂层5,该涂层完全位于视域B之外。在那里可以向观察者插入任意信息。可以将额外的覆盖印刷物6布置在视域B之外,以隐蔽涂层B的侧棱边。
图6示出了根据本发明的制造复合玻璃板的方法的一个实施例的流程图。
附图标记列表:
(10)复合玻璃板
(1)第一玻璃板
(2)第二玻璃板
(3)连接薄膜
(4)载体薄膜
(5)偏振选择性涂层
(6)覆盖印刷物
(20)压热器
(21)第一压板
(22)第二压板
(I)连接薄膜3的具有较小粗糙度的表面
(II)连接薄膜3的具有较高粗糙度的表面
(P)投影仪
(O)观察者/运输工具驾驶员
(B)复合玻璃板10的中央视野。

Claims (15)

1.制造复合玻璃板(10)的方法,所述复合玻璃板适合作为投影装置的投影面,其中:
(a)在载体薄膜(4)上提供偏振选择性涂层(5);
(b)通过以下方式将偏振选择性涂层(5)从载体薄膜(4)转移到连接薄膜(3)上,
(i)将载体薄膜(4)和连接薄膜(3)与位于其间的涂层(5)平面地彼此相叠地布置成薄膜堆叠,
(ii)将所述薄膜堆叠在压热器(20)中在至少8巴的压力和80℃至120℃的温度下处理至少2小时,和
(iii)将载体薄膜(4)从连接薄膜(3)上剥离,其中涂层(5)保留在连接薄膜(3)上;
(c)将连接薄膜(3)平面地布置在第一玻璃板(1)和第二玻璃板(2)之间;和
(d)将第一玻璃板(1)与第二玻璃板(2)通过连接薄膜(3)层压成复合玻璃板(10)。
2.根据权利要求1所述的方法,其中,偏振选择性涂层(5)包含液晶,优选呈胆甾相的液晶。
3.根据权利要求1或2所述的方法,其中,载体薄膜(4)包含聚对苯二甲酸乙二醇酯(PET)。
4.根据权利要求1至3中任一项所述的方法,其中,所述连接薄膜(3)含有聚乙烯醇缩丁醛(PVB)、乙烯乙酸乙烯酯(EVA)、聚氨酯(PU)或其混合物或共聚物或衍生物,优选PVB。
5.根据权利要求1至4中任一项所述的方法,其中,连接薄膜(3)具有较小粗糙度的表面(I)和较高粗糙度的表面(II),并且其中,在步骤(i)中,较小粗糙度的表面(I)朝向载体薄膜(4)。
6.根据权利要求1至5中任一项所述的方法,其中,在步骤(ii)中,薄膜堆叠布置在两个压板(21、22)之间。
7.根据权利要求1至6中任一项所述的方法,其中,在步骤(iii)中,薄膜堆叠的温度为30℃至65℃。
8.根据权利要求1至7中任一项所述的方法,其中,布置偏振选择性涂层(5)与第一或第二玻璃板(1、2)直接接触。
9.根据权利要求1至8中任一项所述的方法,其中,第一玻璃板(1)和/或第二玻璃板(2)具有覆盖印刷物(6),所述覆盖印刷物在层压之后遮蔽所述偏振选择性涂层(5)的侧棱边。
10.根据权利要求1至9中任一项所述的方法,其中,复合玻璃板(10)是挡风玻璃,并且偏振选择性涂层(5)基本上覆盖根据ECE-R43的中央视野B。
11.根据权利要求1至9中任一项所述的方法,其中,复合玻璃板(10)是挡风玻璃,并且将偏振选择性涂层(5)布置在根据ECE-R43的中央视野B之外。
12.根据权利要求1至11中任一项所述的方法,其中步骤(d)中的层压在压热器中在低于130℃,优选最高100℃的温度下进行。
13.根据权利要求1至12中任一项所述的方法,其中,如此将偏振选择性涂层(5)布置在复合玻璃板(10)中,使得其对p偏振的辐射的反射率最大化。
14.制造投影装置的方法,其包括:
(a)根据权利要求1至13中任一项所述的方法制造复合玻璃板(10);
(b)布置投影仪(P),以至于能够照射偏振选择性涂层(5)。
15.根据权利要求14所述的方法,其中,投影仪(P)用p偏振的辐射照射偏振选择性涂层(5)。
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