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US 10,854,792 B2Granted
Light-emitting device and illumination apparatus
AssigneeKYOCERA Corporation
InventorsTamio Kusano, Daisuke Sakumoto
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AssigneeKYOCERA Corporation
InventorsTamio Kusano, Daisuke Sakumoto
Estimating the term…
A light-emitting device includes a wavelength conversion member including, in a dispersed manner, a first phosphor, a second phosphor, a third phosphor, a fourth phosphor, and a fifth phosphor, and a light emitter. The first phosphor has a peak in a wavelength region of 400 to 500 nm, the second phosphor in 450 to 550 nm, the third phosphor in 500 to 600 nm, the fourth phosphor in 600 to 700 nm, and a fifth phosphor in 680 to 800 nm. The light emitter emits light in an ultraviolet region of 380 to 430 nm. The light-emitting device has an emission spectrum in a region of 380 to 950 nm including peaks in regions of 380 to 430 nm, 430 to 480 nm, 480 to 550 nm, 550 to 650 nm, and 650 to 750 nm, and differences between relative light intensities at the peaks are less than 20%.
A light-emitting device, comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
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Wavelength conversion materials: having two or more wavelength conversion materials
Systems of lighting devices, not provided for in main groups f21s4/00 -
Characterised by the material: the material comprising photoluminescent substances
Characterised by coatings: the coatings comprising photoluminescent substances
About 11 years 8 months of term left · ends 25 Jun 2038 (estimated)
The present invention relates to a light-emitting device including a light-emitting diode (LED), and to an illumination apparatus.
Illumination apparatuses including semiconductor light emitters such as LEDs as light sources, instead of fluorescent or incandescent lamps, have been used recently. For example, an illumination apparatus including a light emitter is used as a light source for visual inspection of painted surfaces of products, such as home electric appliances and automobiles.
A semiconductor light emitter emits light with a narrow region of wavelengths, and simply emits monochromatic light. To produce white light as illumination light, a plurality of semiconductor light emitters that emit light in different wavelength regions are prepared, and a plurality of light beams with different colors emitted from such semiconductor light emitters are mixed to produce white light. In some cases, a plurality of phosphors that emit light in different wavelength regions using excitation light with the same wavelength are prepared, and light emitted from a semiconductor light emitter and a plurality of fluorescence beams, which are excited by the light from the semiconductor light emitter, with different colors are mixed into white light. This method of mixing colors allows production of a light source that emits white light or that emits light with another spectrum for intended use (refer to Japanese Unexamined Patent Application Publication No. 2015-126160).
FIG. 1 is an external perspective view of a light-emitting device according to one embodiment of the present invention.
FIG. 2 is a cross-sectional view of the light-emitting device taken along a plane indicated by an imaginary line shown in FIG. 1.
FIG. 3 is an enlarged view of the light-emitting device shown in FIG. 2.
A light-emitting device and an illumination apparatus according to one or more embodiments of the present invention will now be described with reference to the drawings.
Structure of Light-Emitting Device
FIG. 1 is an external perspective view of a light-emitting device according to one embodiment of the present invention. FIG. 2 is a cross-sectional view of the light-emitting device taken along a plane indicated by an imaginary line shown in FIG. 1. FIG. 3 is an enlarged view of the light-emitting device shown in FIG. 2. FIG. 4 is a graph showing example fluorescence spectra of a first phosphor, a second phosphor, a third phosphor, and a fourth phosphor included in phosphors used for the light-emitting device according to the embodiment. FIG. 5 is a graph showing an example fluorescence spectrum of the fifth phosphor included in the phosphors used for the light-emitting device according to the embodiment. FIG. 6 is a graph showing an example emission spectrum of excitation light emitted from a light emitter included in the light-emitting device according to the embodiment. FIG. 7 is a graph showing an emission spectrum of the light emitter according to one embodiment of the present invention. As shown in these figures, a light-emitting device 1 includes a substrate 2, a light emitter 3, a frame 4, a sealant 5, and a wavelength conversion member 6.