ILLUMINATION SOURCE, ILLUMINATION SYSTEM, AND DIMMING CONTROL METHOD FOR THE PRODUCTION OF DIFFERENT COLOUR TEMPERATURES
First Claim
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1. An illumination source capable of outputting illumination light at different color temperatures, comprising:
- a first light emitting device operable to emit light in a first red;
a second light emitting device operable to emit light in a second red that is different from the first red; and
a third light emitting device operable to emit light in a different color from the first red and from the second red, anda fourth light emitting device operable to emit light in a different color from any of the first red, the second red, and the color of light emitted from the third light emitting device, whereinthe illumination light is outputted at different color temperatures by adjusting luminous intensity ratios of the first to fourth light emitting devices.
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Abstract
An illumination source 1 is capable of outputting illumination light at different color temperatures, by adjustment of luminous intensity ratios of light emitting devices 3-6, where each of the light emitting devices emits light in a corresponding one of at least four colors, the at least four colors including a first red and a second red that is different from the first red. Accordingly, the illumination source 1 is capable of outputting illumination light at an incandescent lamp color, a neutral white color, and a daylight color, and exhibiting favorable color rendering characteristics for all the three colors.
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Citations
11 Claims
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1. An illumination source capable of outputting illumination light at different color temperatures, comprising:
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a first light emitting device operable to emit light in a first red; a second light emitting device operable to emit light in a second red that is different from the first red; and a third light emitting device operable to emit light in a different color from the first red and from the second red, and a fourth light emitting device operable to emit light in a different color from any of the first red, the second red, and the color of light emitted from the third light emitting device, wherein the illumination light is outputted at different color temperatures by adjusting luminous intensity ratios of the first to fourth light emitting devices. - View Dependent Claims (2, 3, 4, 5, 6, 8)
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7. An illumination source capable of outputting illumination light at different color temperatures, comprising:
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a first red light emitting device having a first red LED whose light emission peak wavelength lies within a range of 620 nm to 630 nm, inclusive; a second red light emitting device having a second red LED whose light emission peak wavelength lies within a range of 630 nm to 640 nm, inclusive; a blue light emitting device having a blue LED whose light emission peak wavelength lies within a range of 455 nm to 465 nm, inclusive; and a white light emitting device having a blue LED whose light emission peak wavelength lies within a range of 455 nm to 465 nm, inclusive, and a green phosphor whose light emission peak wavelength lies within a range of 545 nm to 555 nm, inclusive, the white light emitting device generating white light by mixing blue light emitted from the blue LED and green light emitted from the green phosphor, wherein the illumination light is outputted at different color temperatures by adjusting luminous intensity ratios of the first red light emitting device, the second red light emitting device, the blue light emitting device, and the white light emitting device. - View Dependent Claims (9, 10)
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11. A dimming control method used in an illumination system, the illumination system including an illumination source and a lighting apparatus, the illumination source capable of outputting illumination light at different color temperatures by adjustment of luminous intensity ratios of a plurality of light emitting devices, and the lighting apparatus being operable to control power to the light emitting devices respectively thereby causing the light emitting devices to emit light in respective luminous intensities, wherein
each of the light emitting devices emits light in a corresponding one of at least four colors, the at least four colors including a first red and a second red that is different from the first red.
Specification