CN112443805B - 车辆的具有封闭片的发光设备 - Google Patents
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Abstract
本发明涉及一种车辆的具有封闭片(1)的发光设备,其中,所述发光设备具有用于产生光(4)的发光器件,其中,所述发光设备具有用于将通过所述发光器件产生的光(4)在可见短波范围内的至少一部分的波长偏移为在长波波长范围内的辐射的器件,其中,所述器件在所述发光设备中这样设置,使得由所述器件产生的长波辐射(9)对准到所述封闭片(1)上。
Description
技术领域
本发明涉及一种车辆的具有封闭片的发光设备,其中,所述发光设备具有用于产生光的发光器件。
背景技术
可见光的波长处于从大致380nm至大约780nm的范围内。
在车辆上的发光设备特别是作为车辆的前照灯和作为车辆的尾灯已知。所述发光设备包括一个或多个发光器件、例如设置在反射器的区域中的LED以及一个封闭片,所述封闭片与后方的壳体一起负责使前照灯亦或尾灯防潮地锁闭。
所述发光设备、亦即不仅前照灯而且尾灯的问题在于,在低温的情况下通过在所述发光设备的封闭片上的冷凝而形成冰层。在行驶开始时,所述冰层导致结冰的前照灯产生的光在所述冰层中被吸收并且也被非对准地偏转,也就是说,所述光被反射或转向到行驶道路的非期望的区域中、例如到对向交通中。
当下面谈及前照灯时,这以相同的方式也适用于尾灯。
基于在现代前照灯中相对高效的LED光源,封闭片的解冻仅非常缓慢地进行,因为通过前照灯的红外辐射的散热比较小。这也因为在LED中,热主要在背侧上并且因此沿与封闭片相反的方向发出。也就是说,直到在这种前照灯中封闭片解冻完,时间可能过去直至30分钟。此外,在降雪的情况下可能出现前照灯被雪遮盖,由此显著地限制所述前照灯的功能功率。
对此已知,将以细金属丝的形式的电阻加热元件设置在封闭片中。这不仅影响前照灯的外观,而且影响前照灯的照明强度分布。此外,存在以薄膜的形式的透明的电阻加热元件,如其也在车辆的前挡玻璃中所得以使用的那样。这由于前照灯的封闭片的弯曲基于在敷设薄膜时所存在的形成褶皱风险而决定地是不适合的。
与此无关地,在以细金属丝的形式的或者也基于薄膜的电阻加热元件(所述电阻加热元件附加于前照灯的余热地产生所需的加热功率而)中适用的是,为了能量高效地运行需要用于温度检测的传感器和用于调节的控制元件。两者使这样的前照灯比较昂贵。
同样已知,在发光设备、亦即例如前照灯的区域中安放红外辐射器。所述红外辐射器需要相应的另外的、分别具有单独的供电装置和相应的控制电子装置的光源。
也已知,通过对流的空气流来利用LED模块的热,这通过使用通风装置而需要附加的结构空间以用于将空气流从LED模块引导至封闭片。
发明内容
因此,本发明的目的在于,能按照简单的方式和方法实现对冻结的发光设备、例如前照灯进行解冻,并且也防止发光设备由于例如在行驶期间的降雪而重新冻结。
为了实现所述目的,按照本发明提出,所述发光设备具有用于将通过所述发光器件产生的光在可见短波范围内的至少一部分的波长偏移为在长波波长范围内的辐射的器件,其中,所述器件在所述发光设备中这样设置,使得由所述器件产生的长波辐射对准到所述封闭片上。在此,所述长波辐射可以直接或间接地、例如通过透镜、反射器或光导体朝向封闭片的方向对准。
由此明显地,例如通过LED光源产生的可见光至少部分地用于,所述可见光通过所述器件转变到长波范围内、特别是转变到在可见光之上的波长范围(从780nm至8000nm)内,以便通过红外辐射保持封闭片没有冰和雪。为了进一步地理解应当指出,短波的可见光转变到长波范围内也可以仅按份额地进行,也就是说,所述光仅部分地偏移到红外范围内。两种情况、也就是说不仅完全的而且部分的偏移都落入本发明的范围内。
因此,按照本发明的特别特征规定,用于将短波辐射偏移为长波辐射的所述器件具有波长偏移涂层。通过这样的波长偏移涂层,具有从大约380至大约780nm的波长的光至少部分地偏移到红外范围内,以便通过在此产生的红外辐射保持封闭片没有冰和雪。在此有利的是比较高的效率,这由于在红外辐射必需的位置处产生红外辐射而引起。
在此,按照本发明可以规定,所述波长偏移涂层设置在所述封闭片上。就这点而言,按照两种变型方案存在如下可能性:一方面将所述波长偏移涂层设置在所述封闭片的内侧上亦或设置在所述封闭片的外侧上。
将所述波长偏移涂层设置在所述封闭片的外侧上具有如下优点:如果冰和雪对于红外辐射的在其中发生了偏移的长波范围是吸收性的,则所述红外辐射能实现直接地升温并且因此能实现在所述封闭片上的冰或雪的融化。
备选地存在如下可能性:在所述封闭片的内侧上设置所述波长偏移涂层。在此,红外辐射可以具有如下波长范围,在所述波长范围中所述红外辐射至少部分地在封闭片中被吸收,这导致所述封闭片直接地升温,这间接地引起在所述封闭片外侧上的冰和雪融化。在此,效率相对于第一变型方案略差,这由于加热封闭片而引起。但也可设想,所述封闭片至少对于红外辐射的一部分、亦即在确定的波长范围内的红外辐射透射地构成,从而冰不仅间接地通过由于吸收而升温的封闭片而且直接地通过所透射的并被冰吸收的辐射而融化。
按照本发明的另一特征规定,所述波长偏移涂层构成为荧光层。如果可见光射到发荧光的层上,则在一定范围内发生波长朝向较长波长的偏移,也就是说,在光的辐射中产生红外份额,所述红外份额于是用于负责使前照灯或尾灯的封闭片没有冰和雪。
另一种变形方案的特征在于,用于将短波光偏移为长波辐射的所述器件是设置在所述封闭片中的物质。在此可以规定,在封闭片中集成用于将短波光偏移为长波辐射的相应的层;备选地存在如下可能性:在所述封闭片例如通过注塑的成型之前将相应的波长偏移材料按照混料的意义混合到所述封闭片的材料中。
特别是规定,所述物质是发荧光的。也就是说,在该变型方案中,短波光也可以至少部分地转变为长波红外辐射,其中,于是通过具有确定的波长范围的长波辐射使所述封闭片通过吸收而升温,但是所述长波辐射的一部分也穿过封闭片并且直接地被所述封闭片上的冰或雪层吸收,并且使所述冰或雪层融化。特别是可以规定,所述物质作为层设置在所述封闭片中。
按照一种实施形式,在前照灯中的散射光用于波长偏移为长波辐射,其中,在所述发光设备的内部区域内,用于将短波光偏移为长波辐射的所述器件构成为设置在散射光中的层。在此,通过散射光的波长偏移产生的长波辐射是这样的光,所述光要么直接在前照灯中通过发光器件和必要时与反射器相联系地产生、要么在封闭片结冰的情况下是由冰/雪反射到前照灯的内部中的光。
在此存在如下可能性:将所述层设置在发光设备的反射器上,或者在发光设备的内部中这样设置这样的层,使得通过所述层使长波辐射对准到封闭片上。按照所述封闭片对于哪些波长是可穿透的,这于是导致所述封闭片升温和/或辐射被冰/雪层吸收,如这已经在其他位置所阐述过的那样。在此有利的是,不需要电子的或电气的组件,并且其特征在于,通过散射光的波长偏移产生的长波辐射、还有通过在冰/雪层中被反射到前照灯的内部中的这样的光,由此出现自调节效应,其特征在于,所产生的红外辐射在所述封闭片除冰结束的情况下在很大程度上自下调。
所述原理在所有变型方案或实施方式中最终是相同的;所述原理在于,利用材料、例如发荧光的层或涂层,通过至少部分地吸收在从大约380nm至780nm的范围内的短波光,引起在从超过780nm的范围内、特别是在从780nm至8000nm的范围、亦即通常称为近红外和中红外的范围内的长波辐射的发射。在该范围内的红外辐射也被称为在地球温度下的热辐射。
附图说明
下面借助于附图示例性地详细地阐述本发明。
图1示意性示出波长偏移涂层在设置在封闭片的内侧上的情况下的作用方式;
图2示意性示出波长偏移涂层在设置在封闭片的外侧上的情况下的作用方式;
图3示意性示出具有内置的使波长偏移的涂层的封闭片;
图4示意性示出散射光,所述散射光一方面作为直接光通过发光器件产生并且另一方面通过在封闭片上的冰/雪上反射的可见光产生。
具体实施方式
在各附图中,对于相同的物体使用相同的附图标记。封闭片1在按照图1的实施方式中示出以发荧光的涂层2形式的波长偏移涂层在所述封闭片的内侧上。在此,所述封闭片和所述涂层形成一个构件。示例性地在图1中规定,通过发光器件(未示出)产生的可见光4射到在封闭片上的波长偏移涂层2上;在此,例如20%的可见光通过波长偏移涂层2转变为在红外范围内的长波辐射9;其余的80%作为发出的可见光对于照明、例如道路的照明可供使用。偏移到长波范围内的、20%的可见光用于通过吸收和/或通过在封闭片上的冰/雪层中的吸收来使封闭片1升温并且负责使冰或雪层6融化。
按照图2规定,波长偏移涂层2设置在所述封闭片1的外侧上,从而通过所述波长偏移涂层、例如通过发荧光的涂层产生的红外线9直接对于通过在冰/雪层中的吸收而融化冰和雪层6可供使用。在此也适用的是,可见光、更确切地说可见光的一部分(在当前情况下例如20%)通过所述波长偏移涂层得以分成红外范围内的辐射9。
按照图3规定,在那里示意性示出的由两部分构成的封闭片1在内部具有由波长偏移材料制成的涂层2或层、例如荧光层。
在按照图4的示图中,又将通过发光器件7产生的光4规定在短波可见范围内,其中,散射光8由所述光例如通过冰层6所引起地发出、例如射在例如反射器5上的具有发荧光的物质的涂层2上并且在那里至少部分地被吸收,并且作为长波辐射发射。在此,所发射的、具有在红外范围内的份额的辐射9对准到封闭片1上,其中,所述封闭片通过吸收升温和/或所述长波辐射9穿过封闭片1、射到冰/雪层6上并且在那里导致冰或雪直接融化。
附图标记列表
1 封闭片
2 涂层
4 光
5 反射器
6 冰和雪层
7 发光器件
8 散射光
9 辐射(在长波范围内)
Claims (14)
1.车辆的具有封闭片(1)的发光设备,其中,所述发光设备具有用于产生光(4)的发光器件,
其特征在于,
所述发光设备具有用于将通过所述发光器件产生的光(4)在可见短波范围内的至少一部分的波长偏移为在长波波长范围内的红外辐射的器件,其中,所述器件设置在所述发光设备中,使得由所述器件产生的在长波波长范围内的红外辐射(9)对准到所述封闭片(1)上。
2.按照权利要求1所述的发光设备,
其特征在于,
所述器件构成为波长偏移涂层(2)。
3.按照权利要求2所述的发光设备,
其特征在于,
所述波长偏移涂层(2)设置在所述封闭片(1)上。
4.按照权利要求2或3所述的发光设备,
其特征在于,
所述波长偏移涂层(2)设置在所述封闭片(1)的内侧上。
5.按照权利要求2或3所述的发光设备,
其特征在于,
所述波长偏移涂层(2)设置在所述封闭片(1)的外侧上。
6.按照权利要求2或3所述的发光设备,
其特征在于,
所述波长偏移涂层(2)构成为荧光层。
7.按照权利要求1所述的发光设备,
其特征在于,
所述器件作为设置在所述封闭片(1)中的物质。
8.按照权利要求7所述的发光设备,
其特征在于,
所述物质是发荧光的。
9.按照权利要求7或8所述的发光设备,
其特征在于,
所述物质作为层设置在所述封闭片(1)中。
10.按照权利要求7或8所述的发光设备,
其特征在于,
所述物质在所述封闭片成型之前与用于所述封闭片的材料混合。
11.按照权利要求1所述的发光设备,
其特征在于,
所述光构成为散射光(8),其中,在所述发光设备的内部区域中,所述器件构成为涂层,所述涂层设置在所述散射光(8)中。
12.按照权利要求11所述的发光设备,
其特征在于,
所述涂层由发荧光的材料制成。
13.按照权利要求11或12所述的发光设备,
其特征在于,
所述涂层能设置在所述发光设备的内部中的任意面上。
14.按照权利要求13所述的发光设备,
其特征在于,
所述涂层设置在反射器、遮挡框架或模块挡板上。
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