Illumination apparatus
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsYoko Matsubayashi, Tohru Himeno
Life of this patent
Estimating the term…
Abstract
An illumination apparatus includes a first LED, a second LED, and a control unit. The first LED emits white light. The second LED emits white light having a correlated color temperature lower than that of the white light emitted from the first LED and a chromaticity deviation Duv higher than that of the white light emitted from the first LED. The control unit changes a light output ratio of the first LED and the second LED. The first LED emits the white light of the correlated color temperature ranging from 1563K to 4500K and the chromaticity deviation Duv ranging from −1.6 to −12. The second LED emits the white light of the correlated color temperature ranging from 1563K to 4500K and the chromaticity deviation Duv ranging from +10 to −1.6.
Claims8
An illumination apparatus comprising:
- a first LED configured to emit white light;
- a second LED configured to emit white light having a correlated color temperature lower than a correlated color temperature of the white light emitted from the first LED and a chromaticity deviation Duv higher than a chromaticity deviation Duv of the white light emitted from the first LED;
- and
- a controller configured to change a light output ratio of the first LED and the second LED,
- wherein the first LED emits the white light having a correlated color temperature ranging from 1563K to 4500K and a chromaticity deviation Duv ranging from −1.6 to −12,
- the second LED emits the white light having a correlated color temperature ranging from 1563K to 4500K and a chromaticity deviation Duv ranging from +10 to −1.6, and
- the controller controls such that in a xy chromaticity diagram, the white light emitted from the first LED is plotted in a region between a first curved line expressed by a following equation 1 and a second curved line expressed by a following equation 2, and the white light emitted from the second LED is plotted in a region between the first curved line and a third curved line indicating a chromaticity deviation Duv+10:
- y=−2.6186x2+2.5412x−0.2147 Eq. 1
- y=−3.1878x2+2.8976x−0.2836 Eq. 2.
Dependencies are inferred from the claim text.