COLOR TEMPERATURE ADJUSTING METHOD AND ILLUMINATING DEVICE USING THE METHOD

• US 20140175987A1
• Filed: 10/18/2013
• Published: 06/26/2014
• Est. Priority Date: 12/24/2012
• Status: Abandoned Application

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: LAI, CHIH-CHEN
• Application Number:
  US14/056,967
• Publication Number:
  US 20140175987A1
• Time in Patent Office: Days
• US Class Current: 315/151
• CPC Class Codes: H05B 45/22 using optical feedback

Abstract

A color temperature adjusting method includes steps: providing a controller storing a color temperature setting value therein, a main white light source including first and second sub-main white light sources having different color temperatures, and an adjusting light source comprising red, green and blue light sources; comparing the color temperature setting value with that of an environmental light to obtain a difference value; controlling currents to the two sub-main white light sources, the red light source, the green light source and the blue light source to obtain a compensation light according to the difference value; and mixing the compensation light and the environmental light to obtain a resulted light which has a color temperature equal to the setting value. An illuminating device using the color temperature adjusting method is also provided.

Claims

1. A color temperature adjusting method comprising steps:

providing a controller storing a color temperature setting value therein, a main white light source comprising a first sub-main white light source and a second sub-main white light source having a color temperature different from that of the first sub-main white light source, and an adjusting light source comprising a red light source, a green light source and a blue light source;

comparing the color temperature setting value with that of a environmental light to obtain a difference value;

controlling brightness of each of the first and second sub-main white light sources, the red light source, the green light source and the blue light source according to the difference value to obtain a compensation light; and

mixing the compensation light with the environmental light to obtain a resulted light which has a color temperature equal to the color temperature setting value stored in the controller.

2. The color temperature adjusting method of claim 1, wherein a light sensor is provided to sense the environmental light and transfer the data of the environmental light to the controller, the controller comparing the data of the environment light with the setting value to calculate the difference value.

3. The color temperature adjusting method of claim 2, wherein the light sensor continuously senses the resulted light after the compensation light and the environmental light are mixed together, the controller adaptively adjusting the illuminating device thereby to adjust the compensation light when the resulted light changes its characteristic.

4. The color temperature adjusting method of claim 1, wherein the brightness of the two sub-main white light sources, the red light source, the green light source and the blue light source are adjusted by adjusting input currents thereof

5. The color temperature adjusting method of claim 4, a third sub-main white light source and a fourth sub-main white light source are further provided to obtain the compensation light, color temperatures of the first sub-main white light source, the second sub-main white light source, the third sub-main white light source and the fourth sub-main white light source being different from each other.

6. The color temperature adjusting method of claim 5, wherein a color temperature of the compensation light is different from that of each of the first sub-main white light source, the second sub-main white light source, the third sub-main white light source and the fourth sub-main white light source, the compensation light having a chromaticity coordinate on the CIE 1931 chromaticity coordinates chart.

7. The color temperature adjusting method of claim 1, wherein the color temperature setting value stored in the controller is manually input by user.

8. The color temperature adjusting method of claim 1, wherein a driving unit is provided to drive the two sub-main white light sources, the red light source, the green light source and the blue light source to obtain the compensation light.

9. An illuminating device, comprising:

a main white light source comprising two sub-main white light sources;

a plurality of red light sources;

a plurality of blue light sources; and

a plurality of green light sources;

wherein the main white light source is set in a middle of the illuminating device, the red, blue and green light sources alternately surrounding the main light source; and

wherein a brightness of each of the red, blue and green light sources is changeable to change a color temperature of light from the main white light source by mixing light of the red, blue, green light sources with the light from the main white light source, the light from the main white light source and the light from the red, blue and green light sources being mixed together to obtain an outgoing light of the illuminating device which has a chromaticity coordinate located at a Plank'"'"'s curve on a CIE 1931 chromaticity coordinates chart.

10. The illuminating device of claim 9, wherein color temperatures of the two sub-main white light sources are different from each other.

11. The illuminating device of claim 10, wherein a brightness of light obtained by mixing light from the two sub-main white light sources is changeable by changing currents applied to the two sub-main white light sources.

12. The illuminating device of claim 9, the main white light source, the blue light sources, the red light sources and the green light sources are arranged in a same plane.

13. The illuminating device of claim 12, the red light sources, the blue light sources and the green light sources are arranged alternately around the main white light source.