Title:
体積散乱用要素を有する発光ダイオードベースのランプ
Document Type and Number:
Japanese Patent JP5386589
Kind Code:
B2
Abstract:
A lamp having a candle-like appearance and using one or more light-emitting diodes (LEDs) as its light source is presented. The candle-like appearance arises because light is emitted from only a small volume at or near the center of the bulb. The heat sink and control electronics are located outside the bulb of the lamp. Inside the bulb is a set of secondary optics that guide the light from one or more LEDs to an emission point at a prescribed location in the interior of the bulb. The secondary optics include a light pipe that guides light away from the LED chip, and a volume scattering element that receives the light from the light pipe and scatters it into various directions. The volume scattering element is made from a transparent base material, and includes transparent particles of a predetermined size and refractive index. Because the lamp is typically used in an overhead position, such as in a hanging chandelier, 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 downward (toward the base of the bulb) than upward, while maintaining a reasonable efficiency (fraction of produced light that successfully exits the lamp). Simulation results are presented.
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Inventors:
Michelle Juan
Junwon Lee
Tom Spehalski
Fernando Uroa
Junwon Lee
Tom Spehalski
Fernando Uroa
Application Number:
JP2011532119A
Publication Date:
January 15, 2014
Filing Date:
September 22, 2009
Export Citation:
Assignee:
Osram Sylvania Incorporated
International Classes:
F21S6/00; F21S2/00; F21V3/00; F21V3/02; F21V3/04; F21V29/00; F21Y101/02
Domestic Patent References:
| JP2003515899A | ||||
| JP2006313717A |
Attorney, Agent or Firm:
Axis International Patent Business Corporation