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(A), B(A) and V(A) 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
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 A 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
- )
- 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.
Dependencies are inferred from the claim text.