CN101769451A - 发光二极管灯具 - Google Patents

发光二极管灯具 Download PDF

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CN101769451A
CN101769451A CN200810306610A CN200810306610A CN101769451A CN 101769451 A CN101769451 A CN 101769451A CN 200810306610 A CN200810306610 A CN 200810306610A CN 200810306610 A CN200810306610 A CN 200810306610A CN 101769451 A CN101769451 A CN 101769451A
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light emitting
emitting diode
led lamp
light
sensor
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CN101769451B (zh
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古金龙
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QUANYIDA TECHNOLOGY (FOSHAN) Co Ltd
Hon Hai Precision Industry Co Ltd
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Hong Jun Precision Industry Co ltd
Fuzhun Precision Industry Shenzhen Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
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    • F21S4/00—Lighting devices or systems using a string or strip of light sources
    • F21S4/20—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports
    • F21S4/28—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports rigid, e.g. LED bars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
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    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
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    • F21V7/30—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by coatings the coatings comprising photoluminescent substances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Abstract

一种发光二极管灯具，其包括若干第一发光二极管，该发光二极管灯具还包括若干第二发光二极管，这些第二发光二极管发出的光线色温与第一发光二极管发出的光线色温不同。本发明的发光二极管灯具可同时发出不同色温的光线，从而满足各种天气条件的需求。

Description

发光二极管灯具
技术领域
本发明涉及一种发光二极管灯具，特别是指一种可输出不同色温的发光二极管灯具。
背景技术
作为一种新型的光源，发光二极管凭借其节能、环保、高效等特点，已被应用到越来越多的领域当中，大有取代传统光源的趋势。
发光二极管芯片是发光二极管内最为重要的元件，它决定了发光二极管的发光亮度及出光颜色。在通用照明领域，为了获取照明所必需的白光，目前最为普遍的方法是将一蓝光芯片与黄色荧光粉组合使用，通过混光效应而产生白光，即，芯片受电流所驱动而发出蓝光之后，一部分蓝光激发荧光粉使之发出黄光，这部分黄光与剩余的蓝光混合而形成所需的白光。
众所周知，不同色温的光线的穿透能力各有不同，其中高色温(＞8000k)的蓝光波长最短，其穿透能力最弱，而低色温(＜3500K)的橙光波长最长，其穿透能力最强。因此，对于户外灯而言，在较为晴朗的天气，一般会需要偏蓝的白光，以获取较好的照明效果；而当天气非常潮湿(如下雨或起雾)时，则一般会需要偏黄的白光，以使光线能够穿透水滴或雾气而传播较远的距离，从而增强光线的可见性。但是，由于上述发光二极管仅能发出同一色温的光线，导致安装这些发光二极管的灯具的照明效果非常单一化，无法同时适应多种不同天气的需求。
发明内容
有鉴于此，实有必要提供一种可输出不同色温的发光二极管灯具。
一种发光二极管灯具，其包括若干第一发光二极管及第二发光二极管，这些第一发光二极管所发出光线的色温不同于第二发光二极管所发出光线的色温。
与现有技术相比，由于本发明采用具有不同色温的第一发光二极管及第二发光二极管配合使用，从而使灯具可在多种色温模式间切换，提供多样化的照明效果，以适应各种天气状况的需求。
下面参照附图，结合具体实施例对本发明作进一步的描述。
附图说明
图1是本发明第一实施例的发光二极管灯具中的发光二极管阵列的示意图。
图2是图1的发光二极管灯具的电路方框图。
图3是本发明第二实施例的发光二极管灯具的截面示意图。
图4与图3类似的本发明第三实施例的发光二极管灯具的截面示意图，其中图3发光二极管灯具的按键被整合至其旋钮内。
图5与图4类似的本发明第四实施例的发光二极管灯具的截面示意图，其中图4发光二极管的反光罩的形状发生变化。
图6与图5类似的本发明第三实施例的发光二极管灯具的截面示意图，其中图5反光罩内被涂敷有一层荧光粉。
具体实施方式
请参阅图1及图2，示出了本发明第一实施例的发光二极管灯具350的光源，其由一发光二极管阵列所构成。该发光二极管阵列由两类不同的多个第一及第二发光二极管模组220、240交替排列而成，其中第一发光二极管模组220包括若干可发出低色温(＜3500K)的暖白光的第一发光二极管222，第二发光二极管模组240包括若干可发出高色温(＞8000K)的冷白光的第二发光二极管242。这些第一发光二极管模组220均彼此串接，然后与已串接好的第二发光二极管模组240并联至相应的驱动电路340中，由此，第一发光二极管模组220与第二发光二极管模组240可被选择性的点亮，即每次仅使第一发光二极管模组220及第二发光二极管模组240中的一类被点亮，以驱动灯具350产生不同色温的照明效果。
在各种户外应用中，如道路或广场，为使灯具350能实现自动调光的功能，还可将一传感器320电性连接至灯具350。如图2所示，其为灯具电路的方框图。该灯具电路包括一电源310及依次连接至电源310的一传感器320、一控制电路330、一驱动电路340及一发光二极管灯具350。该传感器320用于测定外界环境的参数，以发出相应的信号至控制电路330内，从而使灯具350在不同的色温模式间切换。优选地，为使灯具350的灯光能给行人带来较为舒适的感受，该传感器320可为一温度传感器。当外界环境的温度较高时(如＞20℃)，传感器320将输入信号I至控制电路330中，控制电路330根据该信号选择接通第二发光二极管模组240，然后通过驱动电路340将电流输入进第二发光二极管模组240中，使整个灯具350产生高色温的冷光，从而使经过灯具350的行人感觉较为凉爽。当外界环境温度较低时(如＜20℃)，传感器320将信号II输入进控制电路330中，从而仅驱动第一发光二极管模组220，使灯具350以低色温的暖光进行照明，由此，经过灯具350的行人在暖色的心理作用下将感觉到比较温暖。当然，基于其它需求，上述传感器320还可以选择为其它类型的传感器，如能够满足交通需求的湿度传感器。该种湿度传感器320在侦测到外部环境的湿度大于某一临界值(如下雨或起雾)时，将发送信号III至控制电路330而点亮第一发光二极管模组220，使灯具发出长波长的暖色光，以确保光线可传播至较远的距离。而当外部环境的湿度低于该临界值时，湿度传感器320将发出信号IV至控制电路330，此时仅有第二发光二极管模组240被接通，从而使灯具350发出短波长的冷色光。
当然，上述两种传感器320可一并使用，但此时控制电路330必须设定成能够判断二传感器320的信号优先级而仅接受其中一种信号，以避免不同信号间的相互干扰。为在交通及人体舒适度需求间获取一平衡，上述二传感器320的信号优先级可设置如下：
  温度传感器信号   湿度传感器信号   高优先级
  I   III   III
  温度传感器信号   湿度传感器信号   高优先级
  I   IV   IV
  II   III   II
  II   IV   II
上述判断过程可通过控制电路330中的比较器(图未示)进行，其选通具有高优先级的信号而将低优先级的信号过滤掉，从而驱动灯具350以所需的色温照明。
在某些场合中，如住宅、商店等，人们更愿意通过手动控制来达到灵活调节灯具350色温的目的，此时，灯具350的传感器320就被手动开关所代替。如图3所示，其为本发明第二实施例的灯具(图未标)。该灯具包括一基板270、一枢设于基板270中部的旋钮260、一固定至旋钮260上的支架250、安装至支架250上的若干第一发光二极管模组220及第二发光二极管模组240及一与支架250隔离设置的反光罩280。该支架250包括二彼此垂直的臂部252，该二臂部252的连接处固定至旋钮260上，从而使支架250可随着旋钮260的转动改变朝向，进而改变灯具的出光角度。支架250的左臂部252上固定有多块第一发光二极管模组220，右臂部252上固定有多块第二发光二极管模组240，由此，支架250的左右两侧可发出具有不同色温的光线。为使灯具能够在两种色温模式间手动切换，一按键272被安装于基板270底部。该按键272通过导线(图未示)与第一及第二发光二极管模组220、240连通，当按键272拨动至左侧时，仅有第一发光二极管模组220被接通，从而使灯具发出暖光；当按键272拨动至右侧时，仅有第二发光二极管模组240被接通，从而使灯具发出冷光。该反光罩280用于将第一及第二发光二极管模组220、240发出的光线汇聚起来，从而提升输出光强。
为方便用户调节色温，上述按键272可被整合进旋钮260中，从而实现半自动的调光功能。如图4所示，该灯具的构造与图3中的构造基本相同，仅有按键272被省略掉。该灯具的支架250右臂部252与基板270的中垂线间形成一个定位角(即右臂部252与基板270右侧间夹角的余角)，其决定了灯具色温的切换时间，即，只有当该定位角随着旋钮260的转动变化至一某一临界值时，灯具的色温才会被切换。优选地，该临界值可被设定为45度，以使第一及第二发光二极管模组220、240的光线对称输出至灯具外部。当旋转旋钮260，使该定位角在0～45度间变化时，仅有第一发光二极管模组220被接通，从而使灯具发出暖光；当继续旋转旋钮260而使该定位角超过45度时，第一发光二极管模组220被熄灭，而同时第二发光二极管模组240被接通，从而使灯具发出冷光。
为使第一及第二发光二极管模组220、240的光线能被更进一步地汇聚，图4中的灯具的反光罩280可变化成如图5所示的构造，改由两个次级发光罩282连接而成。每一次级发光罩282正对于基板270的相应一侧，其光轴大致与旋转至水平位置处的相应发光二极管模组220、240的中心轴共线。基于该种特殊构造的反光罩280的设计，该灯具被设定为仅在定位角为0度及90度时才接通对应的发光二极管模组220、240(即在0度时点亮第一发光二极管模组220，在90度时点亮第二发光二极管模组240)，以使光线能够以最佳的角度射入次级反光罩282中。
为更加灵活地调节输出光的色温，原本集成至单个发光二极管222、242内的荧光粉可单独分离出来。如图6所示，这些荧光粉284被以相同的厚度但不同的浓度分别涂抹于二次级反射罩282的内壁面上，此时第一及第二发光二极管模组220、240的发光二极管222、242内仅剩下蓝光芯片(图未示)，因此此时第一发光二极管模组220及第二发光二极管模组240实质相同，二者均发出相同的蓝色光线。这些蓝光入射至反光罩280的荧光粉284上之后，将被荧光粉284所吸收而激发其产生黄光。由于二次级反光罩282上的荧光粉284的量不同，蓝光被吸收的程度各有所不同，从而导致合成的白光的色温有所差异。经由此种设计，可根据实际需求在二次级反光罩282内涂抹不同量的荧光粉284，从而灵活调节输出光的色温。

Claims (14)

1.一种发光二极管灯具，其包括若干第一发光二极管，其特征在于：该发光二极管灯具还包括若干第二发光二极管，这些第二发光二极管发出的光线色温与第一发光二极管发出的光线色温不同。
2.如权利要求1所述的发光二极管灯具，其特征在于：这些第一发光二极管及第二发光二极管中仅有一类能被同时点亮。
3.如权利要求2所述的发光二极管灯具，其特征在于：该发光二极管灯具通过一控制电路及一传感器连接至一电源，该传感器可根据外界的环境参数发出不同的信号至控制电路内，该控制电路根据不同的信号接通第一发光二极管或第二发光二极管而使之发光。
4.如权利要求3所述的发光二极管灯具，其特征在于：该传感器为一湿度传感器。
5.如权利要求3所述的发光二极管灯具，其特征在于：该传感器为一温度传感器。
6.如权利要求5所述的发光二极管灯具，其特征在于：一湿度传感器连接至该温度传感器，该湿度传感器的信号与温度传感器的信号具有不同的优先级。
7.如权利要求2所述的发光二极管灯具，其还包括一基板及一枢接于基板上的支架，其特征在于：该支架包括二连接的臂部，第一发光二极管安装于其中的一个臂部上，第二发光二极管安装于其中另一个臂部上。
8.如权利要求7所述的发光二极管灯具，其特征在于：该二臂部的连接处通过一旋钮枢接至基板。
9.如权利要求8所述的发光二极管灯具，其特征在于：支架的另一臂部与基板相应一侧间的夹角的余角形成一定位角，第一发光二极管及第二发光二极管随着支架的枢转在不同的定位角被点亮。
10.如权利要求9所述的发光二极管灯具，其特征在于：第一发光二极管及第二发光二极管在定位角为45度的位置处切换工作状态。
11.如权利要求9所述的发光二极管灯具，其还包括一反光罩，其特征在于：该反光罩与支架相隔设置。
12.如权利要求11所述的发光二极管灯具，其特征在于：该反光罩包括二次级反光罩，每一次级反光罩与基板的相应一侧正对。
13.如权利要求12所述的发光二极管灯具，其特征在于：第一发光二极管仅在定位角为0度时被点亮，第二发光二极管仅在定位角为90度时被点亮。
14.如权利要求13所述的发光二极管灯具，其特征在于：该二次级反光罩上涂覆有不同量的荧光粉，该第一发光二极管及第二发光二极管均为蓝光发光二极管。
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