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Light emitting device

A light-emitting device, a technology for emitting light, applied in lighting devices, electroluminescent light sources, light sources, etc.

Active Publication Date: 2013-12-25
SIGNIFY HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In JP2004-363061A, although the color temperature can be set freely, when the luminous flux changes, the color temperature is almost the same

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] According to an embodiment of the present embodiment, the light emitting device 1 includes a light source unit 10 connected to an output terminal of a power supply 2 that outputs a direct current (DC) voltage, such as figure 1 shown in .

[0020] The light source unit 10 has first and second LEDs 11 and 12 that emit light of different colors, the light source unit 10 is configured such that the first and second LEDs 11 and 12 are arranged adjacent to each other, thereby obtaining the first and second LEDs 11 and 12 color-mixed light as emitted light. In order to mix the light from LED 11 and LED 12, a light guide or the like can be used.

[0021] The first and second LEDs 11 and 12 are connected between output terminals of the power supply 2 in parallel with each other. Also, a current limiting resistor R1 is interposed between the parallel circuit of the first and second LEDs 11 and 12 and the output terminal of the power source 2 . Therefore, when a DC voltage (ope...

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PUM

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Abstract

A light emitting device includes: a light source unit having first and second light emitting diodes (LEDs) connected in parallel and respectively emitting light of different colors. When an operating voltage is applied, lights of the first light emitting diode and the second light emitting diode are mixed to provide emitted light of the light source unit. The light source unit further has a resistor connected in series to the first light emitting diode such that forward current change characteristics of the first light emitting diode and the second light emitting diode depending on a change in the operating voltage are different from each other. , so that when the first light-emitting diode and the second light-emitting diode are turned on by applying the operating voltage, a desired luminous flux-color temperature characteristic is obtained, wherein the change of the color temperature of the emitted light depends on the Changes in the luminous flux of the emitted light.

Description

technical field [0001] The invention relates to a lighting device comprising a light emitting diode (LED) as a light source. Background technique [0002] Recently, LEDs having low power consumption and long lifespan have drawn great attention as special light sources used as light sources instead of incandescent lamps of conventional lighting devices. Among light-emitting devices using LEDs as light sources, there are light-emitting devices employing LEDs that emit light of different colors so that the LEDs emit mixed-color light as emitted light (see, for example, JP2004-363061A, paragraphs 0020-0022). [0003] In the light emitting device (illumination device) disclosed in JP2004-363061A, the ratio of the current supplied to each LED of different colors can be changed to change the intensity ratio of light emitted from the LEDs of different colors, thereby selectively setting the color temperature . Also, JP2004-363061A discloses adjusting brightness by maintaining a se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02H05B44/00
CPCH05B45/46H05B45/20
Inventor 田中健一郎
Owner SIGNIFY HLDG BV