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Led based light source

A light source and base technology, applied in the field of light-emitting devices, can solve the problems of low application efficiency, uncomfortable dazzling level, etc.

Inactive Publication Date: 2011-04-06
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this light source is that a considerable part of the luminous flux is directed to the lamp holder where it is absorbed, resulting in low application efficiency
Also obtain high illuminance values, which result in uncomfortably high dazzle levels

Method used

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  • Led based light source
  • Led based light source
  • Led based light source

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0020] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings.

[0021] figure 1 A light emitting device 1 comprising a light source with a light outcoupling surface 2 is shown. The light source includes a plurality of light emitting diodes (LEDs) 3 . According to the invention, the light source comprises at least two LEDs. The light source may comprise any conventional LED, such as a blue LED (eg, a blue InGaN LED). The light source may be adapted to provide a light output ranging from 100 to about 5,000 lumens.

[0022] The light outcoupling surface 2 may be the light outcoupling surface of a plurality of LEDs. The light outcoupling surface according to the invention may be a one-piece surface, or it may consist of a combination of individual light outcoupling surfaces. For example, the light outcoupling surface 2 may be a combined light outcoupling surface of individual LEDs. The light outcoupling surface 2 may...

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PUM

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Abstract

There is provided a light-emitting device (1) comprising a light source comprising a plurality of light -emitting diodes (3), said light source having a light outcoupling surface (2); a base (4); an envelope (5) covering said light source, said envelope having a maximum diameter 2*R in a direction transversal to an imaginary axis extending. through said base and said envelope, around which imaginary axis said envelope is symmetrical; and a light scattering material (6) provided in the path of light from said light outcoupling surface; wherein said light outcoupling surface is located at a position at which said envelope has a diameter D in a direction transversal to said imaginary axis, and within a distance r from said imaginary axis, r is less or equal to D / 4. The light emitting device provides high efficiency in terms of light flux in the forward direction in relation to the total flux from the light source.

Description

technical field [0001] The invention relates to a light emitting device comprising: a light source comprising a plurality of light emitting diodes and having a light outcoupling surface; a base; a housing covering said light source; and in a light path from said light outcoupling surface Provided light scattering material. Background technique [0002] Due to environmental concerns, the replacement of incandescent lamps with energy-saving fluorescent lamps is currently underway. Such fluorescent lamps get about 6 times more light per watt and have a lifespan of up to 10,000 hours, which is ten times that of incandescent lamps. Recently, alternatives have also been realized by various solid-state solutions, specifically light-emitting diodes (LEDs). LED lights require 90% less energy than incandescent lights and 50% less energy than energy-saving fluorescent lights, and it can light for up to 50,000 hours. Other advantages of LED lamps over fluorescent lamps are instant on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21K7/00F21Y101/02F21K99/00
CPCF21K9/00F21K9/135F21Y2105/001F21Y2101/02F21K9/56F21K9/52F21V3/0481F21Y2105/10F21K9/232F21K9/61F21K9/64F21Y2115/10F21V3/12
Inventor P·A·J·霍尔藤G·托尔迪尼V·法布雷克
Owner KONINK PHILIPS ELECTRONICS NV