White light source system
AssigneesKabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.
InventorsMasahiko Yamakawa, Ryoji Tsuda, Yasumasa Ooya, Tatsunori Itoga, Yasuhiro Shirakawa, Junji Taniguchi
Life of this patent
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Abstract
According to one embodiment, there is provided a white light source system including white light sources. An absolute value of a difference between (P(λ)×V(λ))/(P(λmax1)×V(λmax1)) and (B(λ)×V(λ))/(B(λmax2)×V(λmax2)) for each of the white light sources satisfies a relational expression represented by |((P(λ)×V(λ))/(P(λmax1)×V(λmax1))−(B(λ)×V(λ))/(B(λmax2)×V(λmax2))|≤0.15 The white light source system has a light emission characteristic of white light emitted by the system is continuously changed along with an elapse of time by changing a mixing ratio of light beams from the white light sources.
Claims12
A white light source system comprising white light sources each having a general color rendering index of not less than 97,
- wherein an absolute value of a difference between (P(λ)×V(λ))/(P(λmax1)×V(λmax1)) and (B(λ)×V(λ))/(B(λmax2)×V(λmax2)) for each of the white light sources satisfies a relational expression represented by
- |((P(λ)×V(λ))/(P(λmax1)×V(λmax1))−(B(λ)×V(λ))/(B(λmax2)×V(λmax2))|≤0.15
- where the P(λ) is an emission spectrum of the each white light source, the B(λ) is an emission spectrum of black-body radiation having a color temperature corresponding to a color temperature of the each white light source, the V(λ) is a spectrum of a spectral luminous efficiency, the λmax1 is a wavelength that maximizes P(λ)×V(λ), and the λmax2 is a wavelength that maximizes B(λ)×V(λ),
- wherein the white light source system has a light emission characteristic of white light emitted by the system is continuously changed along with an elapse of time by changing a mixing ratio of light beams from the white light sources.
Dependencies are inferred from the claim text.