The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 13, 2019
Filed:
Sep. 22, 2017
Kabushiki Kaisha Toshiba, Tokyo, JP;
Toshiba Materials Co., Ltd., Yokohama-Shi, JP;
Yasuhiro Shirakawa, Yokohama, JP;
Masahiko Yamakawa, Yokohama, JP;
Kabushiki Kaisha Toshiba, Minato-Ku, JP;
Toshiba Materials Co., Ltd., Yokohama-Shi, JP;
Abstract
According to one embodiment, an illumination system includes a plurality of white light sources that satisfies −0.2≤[(P(λ)×V(λ))/(P(λ max 1)×V(λ max 1))−(B(λ)×V(λ))/(B(λ max 2)×V(λ max 2))]≤+0.2 where P(λ) is an emission spectrum of a white light source having a specific color temperature, B(λ) is an emission spectrum of black body radiation having a corresponding color temperature, V(λ) is a spectrum of spectral luminous efficiency, λ max 1 is a wavelength at which P(λ)×V(λ) becomes maximum, and λ max 2 is a wavelength at which B(λ)×V(λ) becomes maximum. The respective white light sources have different color temperatures, and light from the respective white light sources is irradiated from different directions to a target.