Illumination light source, illumination apparatus, outdoor illumination apparatus, and vehicle headlight
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorNaoko Takei
Life of this patent
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Abstract
An illumination light source emits white light resulting from mixing of light emitted from an LED chip and light emitted from a plurality of phosphors. A light emission spectrum of the white light has a peak in a wavelength range from 430 nm to 460 nm. In the light emission spectrum, a proportion of optical intensity at a wavelength of 510 nm relative to optical intensity at the peak is 0.45 or more, and a proportion of optical intensity at a wavelength of 580 nm relative to the optical intensity at the peak is 0.60 or more. Furthermore, in the light emission spectrum, a proportion of optical intensity at a wavelength of 650 nm relative to the optical intensity at the wavelength of 580 nm is 0.4 or less.
Claims12
An illumination light source comprising:
- a light-emitting element;
- and
- a plurality of phosphors each of which is excited by light emitted from the light-emitting element and emits light having a wavelength different from a wavelength of the light emitted from the light-emitting element,
- wherein the illumination light source emits white light resulting from mixing of the light emitted from the light-emitting element and the light emitted from the plurality of phosphors,
- a light emission spectrum of the white light has a peak in a wavelength range from 430 nm to 460 nm,
- in the light emission spectrum,
- a proportion of optical intensity at a wavelength of 510 nm relative to optical intensity at the peak is 0.45 or more,
- a proportion of optical intensity at a wavelength of 580 nm relative to the optical intensity at the peak is 0.60 or more, and
- a proportion of optical intensity at a wavelength of 650 nm relative to the optical intensity at the wavelength of 580 nm is 0.4 or less,
- a correlated color temperature of the white light is in a range from 4500 K to 7000 K, and an average color rendering index Ra of the white light is 70 or more.
Dependencies are inferred from the claim text.