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White LED (light emitting diode) light source with adjustable color temperature and application thereof

A technology of LED light source and LED chip, which is applied in the field of white LED light source, can solve the problems of light attenuation, color temperature drift, large thermal resistance of thermal conductive adhesive, etc., and achieve the effect of overcoming uneven color temperature, overcoming color temperature drift, and reducing junction temperature

Inactive Publication Date: 2014-11-26
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Existing LED white light sources usually use blue or ultraviolet chips to emit blue or purple light, and then coat the corresponding phosphor layer on the chip. The blue light or purple light emitted by the chip excites the light emitted by the phosphor layer and mixes with the remaining blue or purple light. White light sources with different color temperature and color rendering index can be made, but the color temperature and color rendering index of this white light source cannot be adjusted freely
On the other hand, the existing white light-emitting diodes with adjustable color temperature are prepared by coating phosphor layers on the blue and red chips. Due to the limitation of the current powder spotting technology, the color temperature distribution of the light source space is uneven, and due to the mixing of glue Phosphor powder often leads to serious light attenuation and color temperature drift during the use of light sources
In addition, the coating of the blue chip and the red chip by the phosphor layer not only leads to the waste of the use of phosphor, but also makes it difficult for the heat generated by the chip to be dissipated from the top in time.
Finally, the existing LED white light source is fixed on the heat sink by heat-conducting glue. The heat-conducting glue itself has a large thermal resistance and is easy to age. As a result, the heat generated by the chip during the use of the LED white light source cannot be dissipated in time, resulting in the LED light source being used. Serious light decay and color temperature drift during the process

Method used

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  • White LED (light emitting diode) light source with adjustable color temperature and application thereof
  • White LED (light emitting diode) light source with adjustable color temperature and application thereof
  • White LED (light emitting diode) light source with adjustable color temperature and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as Figure 1a , 2a , 3 and 4, a white light LED light source with adjustable color temperature adopts a circular flat ceramic substrate 1, and a number of regularly arranged metal connection layers 2 are arranged on the upper surface of the substrate 1 at intervals and distributed in concentric circles. The distance between adjacent metal connection layers 2 is 50 microns. Several white LED chips 5 or several monochrome LED chips 4 are welded on each metal connection layer 2, and the same LED chip is connected in series, and different LED chips are connected in series; the LED chips on the same metal connection layer 2 , For example, white LED chips 5 or monochrome LED chips 4 are connected in series; adjacent metal connection layers 2 are connected in parallel. An annular reflector 3 is affixed to the edge of the base 1, and the reflector 3 has a reflective surface 32 that is a smooth inclined plane or an inclined arc surface; the white light LED light source als...

Embodiment 2

[0032] Such as Figure 1a , 2a , 3 and 4, the difference between Embodiment 2 and Embodiment 1 is that different LED chips (such as white LED chips 5 or monochromatic LED chips 4) are arranged on adjacent concentric circles, and the corresponding The distance between adjacent concentric circles is 5 mm; and the adjacent metal connection layers 2 are connected in series.

Embodiment 3

[0034] Such as Figure 1b , 2b , 3 and 4, the difference between this embodiment 3 and embodiment 1 is:

[0035] The substrate 1 of the white light LED light source is a circular plate metal heat sink substrate, and the convex lens 6 is a glass lens with a central thickness of 8 mm, and the longitudinal section of the convex lens 6 is an inverted bowl-shaped structure; the metal connection layer on the substrate 1 2 are arranged in a radial fan-shaped array according to different diameters, and the angle between adjacent metal layers is 30°; the same LED chips are arranged on the same metal connection layer 2, such as white LED chips 5 or monochromatic light The LED chips 4 are connected in parallel, and all the white LED chips 5 and all the monochromatic LED chips 4 are connected in series. The white light LED light source in this embodiment adopts high-power (eg 10W) ​​LED chips packaged once, and can be directly applied to street lamps without secondary light distribution...

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Abstract

The invention belongs to the field of optoelectronics, and discloses a white LED (light emitting diode) light source with adjustable color temperature and application of the white LED light source. The white LED light source comprises a substrate, a metal connection layer regularly arranged on the substrate, a plurality of LED chips arranged on the metal connection layer, and a reflector having a sloped reflection surface and arranged at the edge of the substrate. The white LED light source also includes a convex lens with a flat bottom, wherein the flat bottom of the convex lens and the reflector form a vacuum light source cavity for accommodating the LED chips. The white LED light source also includes a plurality of heat tubes and a plurality of cooling fins, wherein the heat tubes are connected with the substrate; and the cooling fins are sheathed on the heat tubes. The white LED light source with adjustable color temperature solves the problems of nonuniform color temperature in the light source space, color temperature drift and so on.

Description

technical field [0001] The invention relates to an LED light source structure, in particular to a white LED light source for lighting with high reliability, high light output rate and adjustable color temperature. The invention also relates to a lamp using a white LED light source with adjustable color temperature. Background technique [0002] Existing LED white light sources usually use blue or ultraviolet chips to emit blue or purple light, and then coat the corresponding phosphor layer on the chip. The blue light or purple light emitted by the chip excites the light emitted by the phosphor layer to mix with the remaining blue or purple light. White light sources with different color temperature and color rendering index can be made, but the color temperature and color rendering index of this white light source cannot be adjusted freely. On the other hand, the existing white light-emitting diodes with adjustable color temperature are prepared by coating phosphor layers o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F21S2/00F21V19/00F21V29/00F21V17/00F21V13/04F21V7/22F21V5/04F21Y101/02F21K9/00F21V29/51F21V29/76F21Y115/10
CPCY02B20/72
Inventor 周明杰刘葳
Owner OCEANS KING LIGHTING SCI&TECH CO LTD