发明名称 |
LIGHT EMITTING DIODE-BASED LAMP HAVING A VOLUME SCATTERING ELEMENT |
摘要 |
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. |
申请公布号 |
EP2337992(A4) |
申请公布日期 |
2012.12.05 |
申请号 |
EP20090820975 |
申请日期 |
2009.09.22 |
申请人 |
OSRAM SYLVANIA INC. |
发明人 |
HUANG, MICHELLE;LEE, JUNWON;SPEHALSKI, TOM;ULLOA, FERNANDO |
分类号 |
F21V3/04;F21K99/00;F21V8/00;F21V29/00;F21Y101/02 |
主分类号 |
F21V3/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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