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. 27, 2024
Filed:
Sep. 04, 2023
Seoul Semiconductor Co., Ltd., Gyeonggi-do, KR;
Masahiko Yamakawa, Kanagawa, JP;
Kumpei Kobayashi, Kanagawa, JP;
Ryoji Tsuda, Kanagawa, JP;
Noriaki Yagi, Kanagawa, JP;
Kiyoshi Inoue, Kanagawa, JP;
Kyung Hee Ye, Gyeonggi-do, KR;
Seoul Semiconductor Co., Ltd., Gyeonggi-do, KR;
Abstract
A white light source and method of use thereof, wherein control of daily rhythm and pleasant lighting can be realized. Amounts of stimulation light emitted from a white light source to the intrinsically photosensitive retinal ganglion cells (ipRGCs) and visual cells of the L cone and M cone, are defined as a melanopic irradiance, an L-cone opic irradiance, and an M-cone opic irradiance, respectively; a ratio of the amounts of the stimulation light is expressed by formula (1); and A is the ratio corresponding to the emission spectrum of the white light source, and B is the ratio corresponding to the radiation spectrum of a black body having the same color temperature as the white light source, an amount of stimulation light emitted to the ipRGC is quantitatively changed by changing the emission intensity of the white light source satisfying formula (2).Melanopic irradiance/(-cone opic irradiance+-cone opic irradiance) (1)0.88≤≤1.11 (2).