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:
May. 05, 2020
Filed:
Jun. 21, 2019
Seiko Epson Corporation, Tokyo, JP;
Shoichi Uchiyama, Suwa-gun Shimosuwa-machi, JP;
SEIKO EPSON CORPORATION, Tokyo, JP;
Abstract
An illumination device includes a blue laser emitting element, a red laser emitting element, a diffusely reflecting element configured to diffuse and reflect a part of light from the blue laser emitting element, a phosphor, a bandpass filter provided to the phosphor to transmit light from the red laser emitting element, a polarization splitting/combining element having a polarization split function, and a first wave plate disposed between the polarization splitting/combining element and the diffusely reflecting element. The polarization splitting/combining element guides a blue first polarization component to the diffusely reflecting element and guides a blue second polarization component to the phosphor. Then, the polarization splitting/combining element combines the fluorescence, the light from the red laser emitting element entering a second surface of the phosphor and then emitted from a first surface, and blue diffused light with each other to generate illumination light.