US 10,375,786 B2Granted

White light source system

AssigneesKabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.

InventorsMasahiko Yamakawa, Noriaki Yagi, Kumpei Kobayashi

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Abstract

According to one embodiment, there is provided a white light source system. P(λ), B(λ) and V(λ) satisfy an equation (1) below in a wavelength range of 380 nm to 780 nm. The white light source system satisfies an expression (2) below in a wavelength range of 400 nm to 495 nm: ∫ 380 780 ⁢ P ⁡ ( λ ) ⁢ V ⁡ ( λ ) ⁢ d ⁢ ⁢ λ = ∫ 380 780 ⁢ B ⁡ ( λ ) ⁢ V ⁡ ( λ ) ⁢ d ⁢ ⁢ λ ( 1 ) P ⁡ ( λ ) / B ⁡ ( λ ) ≦ 1.8 . ( 2 ) where P(λ) is a light emission spectrum of white light, B(λ) is a light emission spectrum of blackbody radiation of a color temperature correspond to a color temperature of the white light, and V(λ) is a spectrum of a spectral luminous efficiency.

Claims12

Dependent claims

A white light source configured to be capable of reproducing white light of a color temperature of 2000 K to 6500 K on a locus of blackbody radiation, and white light of any one of correlated color temperatures with a deviation from the color temperature of the white light being in a range of ±0.005 duv,

wherein P(λ), B(λ) and V(λ) satisfy an equation (1) below in a wavelength range in which λ is 380 nm to 780 nm, and the white light source satisfies an expression (2) below in a wavelength range of 400 nm to 495 nm:
∫
380
780
⁢
P
⁡
(
λ
)
⁢
V
⁡
(
λ
)
⁢
d
⁢
⁢
λ
=
∫
380
780
⁢
B
⁡
(
λ
)
⁢
V
⁡
(
λ
)
⁢
d
⁢
⁢
λ
(
1
)
P
⁡
(
λ
)
/
B
⁡
(
λ
)
≦
1.8
.
(
2
)
where P(λ) is a light emission spectrum of the white light emitted from the white light source, B(λ) is a light emission spectrum of blackbody radiation of a color temperature correspond to a color temperature of the white light, and V(λ) is a spectrum of a spectral luminous efficiency, and
wherein an average color rendering index Ra of the white light emitted from the white light source is 97 or more, and all of color rendering indexes R1 to R8 and special color rendering indexes R9 to R15 are 90 or more.

61 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/251,468Filed 18 Jan 2019 · continuation
Priority: JP 2015-12677624 Jun 2015
Published: US 2019/0159313 A123 May 2019
Granted: 6 Aug 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification24 codes

H10W 90/00
Package configurations
F21S 2/00
Systems of lighting devices, not provided for in main groups f21s4/00 -
H05B 45/20
Circuit arrangements for operating light-emitting diodes [LED]: controlling the colour of the light
H05B 47/10
Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant: controlling the light source

Family

PCT/JP2016/068714Parent of this continuation · filed 23 Jun 2016
Application15/850,399Parent of this continuation · filed 21 Dec 2017
US 2019/0159313 A1Pre-grant publication · published 23 May 2019
US 10,231,305 B2Parent of this continuation
US 2018/0139817 A1Published application
US 10,375,786 B2This patent

From the US filing history. Foreign family members aren’t listed.

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