Title:
LIGHT EMITTING DIODE-BASED LAMP HAVING A VOLUME SCATTERING ELEMENT
Document Type and Number:
WIPO Patent Application WO/2010/044985
Kind Code:
A8
Abstract:
A lamp having a candle-like appearance and using one or more light-emitting diodes (LEDs) as its light source. Light is emitted from only a small volume at or near the bulb's center. Heat sink and control electronics are outside the bulb. Inside the bulb, a set of secondary optics guides light to an emission point at a prescribed location in the bulb's interior. The secondary optics include a light pipe that guides light away from an LED chip, and a volume scattering element, made from a transparent base material and including transparent particles of a predetermined size and refractive index, that receives light from the light pipe, scattering it. The density of particles in the volume scattering element, the particle size, and the particle refractive index are chosen to produce a scattering pattern that directs more light toward the bulb's base, while maintaining reasonable efficiency.
Inventors:
HUANG MICHELLE (US)
LEE JUNWON (US)
SPEHALSKI TOM (US)
ULLOA FERNANDO (US)
LEE JUNWON (US)
SPEHALSKI TOM (US)
ULLOA FERNANDO (US)
Application Number:
PCT/US2009/057756
Publication Date:
May 26, 2011
Filing Date:
September 22, 2009
Export Citation:
Assignee:
OSRAM SYLVANIA INC (US)
HUANG MICHELLE (US)
LEE JUNWON (US)
SPEHALSKI TOM (US)
ULLOA FERNANDO (US)
HUANG MICHELLE (US)
LEE JUNWON (US)
SPEHALSKI TOM (US)
ULLOA FERNANDO (US)
International Classes:
F21V5/00; F21V3/04; F21V29/00
Attorney, Agent or Firm:
MONTANA, Shaun P. (Danvers, Massachusetts, US)
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