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. 28, 2018
Filed:
Apr. 24, 2017
Lumileds Llc, San Jose, CA (US);
Mark Melvin Butterworth, San Jose, CA (US);
Lumileds LLC, San Jose, CA (US);
Abstract
An LED die conformally coated with phosphor is mounted at the base of a shallow, square reflector cup. The cup has flat reflective walls that slope upward from its base to its rim at a shallow angle of approximately 33 degrees. A clear encapsulant completely fills the cup to form a smooth flat top surface. Any emissions from the LED die or phosphor at a low angle are totally internally reflected at the flat air-encapsulant interface toward the cup walls. This combined LED/phosphor light is then reflected upward by the walls and out of the package. Since a large percentage of the light emitted by the LED and phosphor is mixed by the TIR and the walls prior to exiting the package, the color and brightness of the reflected light is fairly uniform across the beam. The encapsulant is intentionally designed to enhance TIR to help mix the light.