CN107085282A - 用于投影至少一个光源的透镜系统 - Google Patents
用于投影至少一个光源的透镜系统 Download PDFInfo
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Abstract
本发明涉及一种用于投影至少一个光源(1)的透镜系统,所述透镜系统从所述光源(1)开始并且在光的传播方向上包括:至少一个第一光学元件组(2),所述至少一个第一光学元件组由至少一个第一会聚透镜组成,所述至少一个第一会聚透镜被称为主透镜(3)、与所述光源(1)接触、用呈现高倒色散系数并呈现大于0.5的沿光轴的其厚度与其宽度的比的材料获得;第二光学元件组(6),所述第二光学元件组由至少一个发散透镜(7)组成,所述至少一个发散透镜用呈现低倒色散系数的材料获得;光瞳(8);和第三光学元件组(9),所述第三光学元件组由反射器或至少一个会聚透镜(10)组成,所述至少一个会聚反射器或至少一个会聚透镜用呈现高倒色散系数的材料获得。
Description
技术领域
本发明涉及一种用于投影至少一个光源的透镜系统,所述至少一个光源例如为据称被沉入在被称为主透镜的第一透镜中的扫描激光器或被称为LED的发光二极管。本发明将在照明领域中以及更具体地在用于机动车辆的照明和/或信号指示系统领域中具有许多应用。
背景技术
在照明领域中,并且特别地在机动车辆领域中,不同类型的灯泡已经被用作光源,但是最近以来,发光二极管(LED)正被越来越广泛地使用。这是因为发光二极管(LED)在将电力转换为光方面具有优异的效率,发射较低的热量,具有减小的尺寸和重量以及较长的寿命。
考虑到这些优点,已经通过使用直接与透镜对准定位的LED阵列设计了许多照明系统,所述透镜通常地为能够修正像差的非球面透镜。而且,计算照明系统的屈光部的表面的形状为标准作法,以便一方面限制由光穿过的所述屈光部引起的像差,并且另一方面在输出端获得期望的光束。虽然对于位于照明系统的光轴上的LED能够获得良好成像,但是照明系统包括大量的LED以及因此远离光轴的LED,这导致不利的场像差。
发明内容
本发明提出改进该现状,并且为此涉及一种用于投影至少一个光源的透镜系统,所述透镜系统从所述光源开始并且在光的传播方向上包括:至少一个第一光学元件组,所述至少一个第一光学元件组由至少一个第一会聚透镜组成,所述至少一个第一会聚透镜被称为主透镜、具有半球形形状、与所述光源接触、用呈现高倒色散系数并呈现大于0.5的沿光轴的其厚度与其宽度的比的材料获得;第二光学元件组,所述第二光学元件组由至少一个发散透镜组成,所述至少一个发散透镜用呈现低倒色散系数的材料获得;光瞳;和第三光学元件组,所述第三光学元件组由至少一个会聚反射器或至少一个会聚透镜组成,所述至少一个会聚反射器或至少一个会聚透镜用呈现高倒色散系数的材料获得。
半球形形状的主光学器件使它能够从光源取得最大量的光,并且三个光学系统的透镜(连续地会聚的、发散的和会聚的)使它能够修正像差并形成光束。
为了使被主光学器件取得的光尽可能多,第一、半球形的主会聚透镜呈现出与球体小于厚度的10%的差异,并且优选地呈现出与球体小于厚度的3%的差异。
优选地,所述第一光学元件组包括第二透镜,所述第二透镜包括至少一个非球面,所述第一光学元件组的第二透镜的非球面在与主透镜相反的一侧上延伸。
而且,所述第二光学元件组的发散透镜优选地由双凹透镜构成。
替代地,所述第二光学元件组的发散透镜由平凹透镜构成。
优选地,第三光学元件组的会聚透镜包括至少一个非球面,所述第三光学元件组的会聚透镜的非球面在与定位在第二光学元件组和第三光学元件组之间的光瞳相反的一侧上延伸。
优选地,所述光源由至少一个LED光源或激光器构成。
根据本发明的一个方面,所述光源由波长转换装置构成,所述波长转换装置与主会聚透镜接触并且从由多个LED光源组成的主光源接收辐射。
优选地,所述波长转换装置由基板组成,所述基板包括分别形成干涉滤光器并分布在至少两个不同区域中的至少两种材料。
附图说明
通过辅以所附的附图阅读下面的纯粹以象征性的方式给出并且不用于限制本发明的说明,将更好地理解本发明,在附图中:
图1为根据本发明的用于投影至少一个光源的透镜系统的示意图;
图2为根据本发明的投影透镜系统变形例的视图,所述变形例包括波长转换装置。
在附图中,相同或相似的元件采用相同的附图标记。
具体实施方式
如图1所示,本发明涉及一种用于投影至少一个光源1的透镜系统。所述透镜系统从所述光源1开始并且在光的传播方向上包括:第一光学元件组2,所述第一光学元件组由第一会聚透镜3和第二透镜4组成,所述第一会聚透镜被称为半球形形状的主透镜3、与所述光源1接触、用呈现高倒色散系数并呈现大于0.5的沿光轴的其厚度与其高度的比的材料获得,所述第二透镜包括非球面5,第一光学元件组2的第二透镜4的非球面屈光部5对应于透镜的输入屈光部,即在主透镜4的一侧上延伸;第二光学元件组6,所述第二光学元件组由发散透镜7组成,所述发散透镜用呈现低倒色散系数的材料获得;光瞳8;和第三光学元件组9,所述第三光学元件组由会聚透镜10组成,所述会聚透镜用呈现高倒色散系数的材料获得。在下文中,在描述中,“高倒色散系数”将被理解为是指大于40的倒色散系数,并且“低倒色散系数”将被理解为是指小于40的倒色散系数。
将看到无论如何在不偏离本发明的范围的情况下,光源1将能够由任何主光源或任何辅助光源构成,例如光导的输出或解耦区,会聚屈光部的矩阵的输出或解耦区,或者由会聚屈光部的矩阵产生的虚拟像(在材料中)。
例如,第一光学元件组2的主透镜3和第三光学元件组9的会聚透镜10将能够用由公司SCHOTT市售的编号为N-LAK33A并且其倒色散系数等于52的光学玻璃(聚甲基丙烯酸甲酯,通常被称为首字母缩略词PMMA,并且其倒色散系数等于58)获得,或者用具有相同的倒色散系数的任何其它的透明热塑性聚合物获得。第二光学元件组6的发散透镜6将能够用呈现出小于40的倒色散系数的任何材料获得,例如聚碳酸酯(PC),其倒色散系数为30,或者玻璃N-SF2,其倒色散系数为339。
半圆形形状的主透镜3使其能够从光源1提取最大量的光,并且三个光学系统2、6和9的透镜3、4、7和10(连续地会聚的、发散的和会聚的)使其能够修正像差并且形成光束。应当注意,“倒色散系数”应当被理解为是指代表透镜的色散的指数。因而,倒色散系数等同于阿贝数和弥散系数,并且对应于作为光的波长的函数的材料的折射率变量。倒色散系数越高,透镜的色散越低。
为了获得光的最佳提取和光学像差的最佳修正,半球形的主会聚透镜3呈现出与球体小于透镜的厚度的10%的差异,优选地与球体小于厚度的3%的差异。
而且,所述第二光学元件组6的发散透镜6由双凹透镜构成,在双凹透镜中,透镜的输入屈光部具有大于输出屈光部的曲率半径的曲率半径。此外,第三光学元件组的会聚透镜10包括非球面屈光部11,第三光学元件组9的会聚透镜10的所述非球面屈光部11在与定位在第二光学元件组6和第三光学元件组9之间的光瞳8相反的一侧上延伸,即对应于所述会聚透镜10的输出屈光部。还应当注意,透镜3、4、6和10的光轴是同轴的。
在该示例性实施例中,光源1由发光二极管(被称为LED)构成,其中磷光体被据称为沉入主透镜3中。“沉入”应当被理解为是指如下事实,即LED的磷光体与主透镜3接触。以这种方式,由磷光体发射的光直接“沉入”在主光学器件中。然而,显然地,在无论如何不偏离本发明的范围的情况下,光源将能够由对本领域技术人员已知的任何光源构成。
根据第一变形例,图中未示出,第一光学元件组2将能够仅包括单一的半球形的主会聚透镜3。
根据另一个变形例,图中未示出,第三光学元件组9的会聚透镜10将能够由一个或多个会聚反射器取代。
而且,不言而喻,在无论如何不偏离本发明的范围的情况下,透镜3、5、7和10中的每一个将能够由至少两个透镜取代。
参照图2,根据另一个变形例,以与前述相同的方式,所述透镜系统从所述光源1开始并且在光的传播方向上包括:第一光学元件组2,所述第一光学元件组由第一会聚透镜3和第二透镜4组成,所述第一会聚透镜被称为半球形形状的主透镜、与所述光源1接触、用呈现高倒色散系数并呈现大于0.5的沿光轴的其厚度与其高度的比的材料获得,所述第二透镜包括非球面5,第一光学元件组2的第二透镜4的非球面屈光部5对应于透镜的输入屈光部,即在主透镜4的一侧上延伸;第二光学元件组6,所述第二光学元件组由发散透镜7组成,所述发散透镜用呈现低倒色散系数的材料获得;光瞳8;和第三光学元件组9,所述第三光学元件组由会聚透镜10组成,所述会聚透镜用呈现高倒色散系数的材料获得。
所述透镜系统与前述透镜系统的不同之处在于,所述透镜系统包括波长转换装置12,所述波长转换装置与主会聚透镜3接触并且从由多个发光二极管(被称为LED)组成的主光源1接收辐射。因而,波长转换装置表现为像沉入式辅助光源,即与主会聚透镜3接触的辅助光源。
将观察到,在无论如何不偏离本发明的范围的情况下,所述多个发光二极管将能够被由可独立寻址的区域组成单个的LED取代,或者被用于通过激光束扫描形成图像的区域取代,所述区域包括扩散和/或反射表面。
因而,根据本发明的照明系统能够以光束形式投影放置在光学系统的焦点处光源的图像,也就是说,光源与半球形的主透镜3接触。更具体地,所述光源1可以为LED矩阵,也就是说,被分成区域(例如方块,例如通常被称为“像素”,其可以彼此独立地打开或关闭,以便产生所谓的自适应照明系统)的光表面。该车辆的自适应照明系统使其能够使光束的光分布适应交通状况。例如,当所有像素被打开时,系统将强的光束(通常被称为远光,其对于其它驾驶员是炫目的)投影在道路上,并且在照明系统前方检测到车辆时,其光使其它驾驶员炫目的像素或多个像素在光束中被关闭,以形成较弱的光束,通常被称为近光。
显然地,应当理解,本发明无论如何不限于上述实施例,并且在不偏离所附的权利要求书的范围的情况下可以对其作出多种修改。
Claims (10)
1.一种用于投影至少一个光源(1)的透镜系统,所述透镜系统从所述光源(1)开始并且在光的传播方向上包括:
至少一个第一光学元件组(2),所述至少一个第一光学元件组由至少一个第一会聚透镜组成,所述至少一个第一会聚透镜被称为主透镜(3)、与所述光源(1)接触、用呈现高倒色散系数并呈现大于0.5的沿光轴的其厚度与其宽度的比的材料获得;
第二光学元件组(6),所述第二光学元件组由至少一个发散透镜(7)组成,所述至少一个发散透镜用呈现低倒色散系数的材料获得;
光瞳(8);和
第三光学元件组(9),所述第三光学元件组由至少一个会聚反射器或至少一个会聚透镜(10)组成,所述至少一个会聚反射器或至少一个会聚透镜用呈现高倒色散系数的材料获得。
2.根据权利要求1所述的透镜系统,其中第一、主会聚透镜具有半球形形状(3),并且呈现出与球体小于厚度的10%的差异,并且优选地呈现出与球体小于厚度的3%的差异。
3.根据权利要求1或2所述的透镜系统,其中所述第一光学元件组(2)包括第二透镜(4),所述第二透镜包括至少一个非球面屈光部(5)。
4.根据权利要求3所述的透镜系统,其中所述第一光学元件组(2)的第二透镜(4)的非球面屈光部(5)在主透镜(3)的一侧上延伸。
5.根据权利要求1-4中任一项所述的透镜系统,其中所述第二光学元件组(6)的发散透镜(7)由双凹透镜构成。
6.根据权利要求1-4中任一项所述的透镜系统,其中所述第二光学元件组的发散透镜由平凹透镜构成。
7.根据权利要求1-6中任一项所述的透镜系统,其中光学元件组(9)的会聚透镜(10)包括至少一个非球面屈光部(11)。
8.根据权利要求7所述的透镜系统,其中所述第三光学元件组(9)的会聚透镜(10)的非球面屈光部(11)在与定位在第二光学元件组(6)和第三光学元件组(9)之间的光瞳(8)相反的一侧上延伸。
9.根据权利要求1-8中任一项所述的透镜系统,其中所述光源(1)由至少一个LED光源或激光器构成。
10.根据权利要求1-8中任一项所述的透镜系统,其中所述光源由波长转换装置(12)构成,所述波长转换装置与主会聚透镜(3)接触并且从由多个LED光源组成的主光源(1)接收辐射。
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US20170234497A1 (en) | 2017-08-17 |
US10670210B2 (en) | 2020-06-02 |
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JP7036539B2 (ja) | 2022-03-15 |
EP3208645B1 (fr) | 2019-01-30 |
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