White light source system
AssigneesKabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.
InventorsMasahiko Yamakawa, Noriaki Yagi, Kumpei Kobayashi
Life of this patent
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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.
Claims28
A white light source system configured to be capable of reproducing white light of a color temperature on a locus of blackbody radiation, and white light of a correlated color temperature with a deviation from the locus of the blackbody radiation,
- 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 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 the white light emitted from the white light source system, 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.
Dependencies are inferred from the claim text.