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:
Mar. 28, 2023
Filed:
Jun. 03, 2021
Seiko Epson Corporation, Tokyo, JP;
Ryuta Koizumi, Shiojiri, JP;
SEIKO EPSON CORPORATION, Tokyo, JP;
Abstract
An illuminator includes a first light emitter that outputs light to a first wavelength band, a first parallelizer parallelizes the first light outputted from the first light emitter, a wavelength converter having a first surface on the first light and a second surface converts the first light into second light belonging to a second wavelength band, an optical element reflects one of light to the first and second wavelength bands and transmits the other, a first focusing system between the first parallelizer and the optical element has positive power, a diffuser between the first focusing system and the optical element diffuses the first light that exits the first system, and a second focusing system between the optical element and the wavelength converter has positive power, and the second system has a focal point between the principal point of the second system and the second surface of the wavelength conversion layer.