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lighting device

A technology for lighting devices and transparent resins, which is applied to lighting devices, lighting device parts, lighting and heating equipment, etc., can solve problems such as decreased luminous efficiency, and achieve the effects of improved luminous efficiency and improved color rendering.

Inactive Publication Date: 2015-09-09
TOSHIBA LIGHTING & TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if a red phosphor is added to improve color rendering, the light in the red region with low visibility increases and the luminous efficiency decreases.

Method used

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Experimental program
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Effect test

no. 1 Embodiment approach

[0041] Fig. 1(a) is a schematic cross-sectional view showing an illumination device 100 according to the first embodiment. As shown in the figure, the lighting device 100 is, for example, a bulb-type lamp (lamp), and includes a light emitting unit 10 , a housing 20 , and a cover 30 covering the light emitting unit 10 .

[0042] Inside the frame body 20 , a power conversion unit 40 is provided to supply power to the light emitting unit 10 , and is electrically connected to the light emitting unit 10 and the lamp base 50 via wires 41 and 42 . Furthermore, the power conversion unit 40 is accommodated in an insulating case 21 provided inside the housing 20 . The power conversion unit 40 receives AC power from a commercial power supply (not shown) via the base 50 , converts it into, for example, DC power, and supplies it to the light emitting unit 10 .

[0043] As shown in FIG. 1( b ), the light emitting unit 10 includes a substrate 3 , a plurality of semiconductor light sources 5...

no. 2 Embodiment approach

[0073] 5( a ), FIG. 5( b ) and FIG. 6( a ), FIG. 6( b ) are radiation spectra of the lighting device according to the second embodiment. The lighting device of this embodiment has the same structure as the lighting device 100 shown in FIG. 1( a ) and FIG. 1( b ), and the phosphor contained in the second transparent resin 9 is different. That is, the second transparent resin 9 contains a red phosphor and a yellow phosphor. The red phosphor has an emission peak in the wavelength range of 600 nm to 650 nm, and its half width is 20 nm or less. The yellow phosphor has a light emission peak within 530nm-570nm, and its half-value width is 60nm-120nm.

[0074] 5( a ) is a graph showing the relationship between the peak wavelength and Ra of the yellow phosphor when the correlated color temperature is 5000K, using the half-value width of the emission peak as a parameter. Fig. 5(b) is a radiation spectrum of the lighting device of this embodiment.

[0075] According to FIG. 5( a ), th...

no. 3 Embodiment approach

[0088] Fig. 7(a) and Fig. 7(b) are graphs showing the emission characteristics of the lighting device according to the third embodiment at a correlated color temperature of 2800K and Ra83. FIG. 7( a ) shows the radiation spectrum A of the lighting device of the present embodiment and the radiation spectrum B of the lighting device of the comparative example. FIG. 7( b ) shows the color coordinates of JIS color rendering evaluation test colors No. 1 to No. 8 at a correlated color temperature of 2800K and Ra83. The horizontal axis is a * axis, the vertical axis is b * axis.

[0089] In this embodiment, the second transparent resin 9 contains, for example, K 2 SiF 6 : Mn as a red phosphor. K 2 SiF 6 : The emission peaks of Mn are located near the light wavelengths of 615nm, 635nm, and 648nm, and the half-value widths are 20nm or less. Furthermore, the second transparent resin 9 includes: a yellow phosphor having a light emission peak within a wavelength range of 540 nm to...

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Abstract

A luminaire includes a semiconductor light source (5) having a light emission peak in a range of wavelength smaller than 480 nm and a phosphor excited by light radiated from the semiconductor light source to radiate light having wavelength equal to or larger than 480 nm. A spectrum of radiated light obtained by combining the light radiated from the semiconductor light source and the light radiated from the phosphor has a light emission peak in a range of wavelength equal to or larger than 610 nm and smaller than 650 nm. A ratio of radiation energy in a range of wavelength equal to or larger than 650 nm and equal to or smaller than 780 nm to radiation energy in a range of wavelength equal to or larger than 600 nm and smaller than 650 nm is equal to or lower than 35%. A color gamut area ratio exceeds 100%.

Description

[0001] This application is entitled to the benefit of priority of Japanese Patent Application No. 2012-068467 filed on Mar. 23, 2012, the entire contents of which are incorporated herein by reference. technical field [0002] Embodiments of the present invention relate to a lighting device. Background technique [0003] Illumination devices using semiconductor light sources represented by blue light emitting diodes (Light Emitting Diode, LED) are becoming more and more popular. Among them, a white light source that emits synthetic light, which is blue light from a blue LED and light emitted from a phosphor excited by the blue light, can be used in a wide range of applications because it is easy to be miniaturized and can simplify the circuit structure. synthetic light. For example, there is a white light source that combines a blue LED and a YAG phosphor (yttrium-aluminum-garnet-based phosphor) that emits yellow light when excited by blue light. Furthermore, there is a hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L33/50F21V9/10F21V9/40
CPCH01L25/0753H01L2924/0002F21V23/006F21V3/00F21Y2101/02H05B33/12F21Y2105/001H01L33/502F21K9/1355F21V23/02H01L33/504F21Y2105/10F21K9/23F21Y2115/10H01L2924/00
Inventor 石渡朋子渡边美保西村洁
Owner TOSHIBA LIGHTING & TECH CORP