Side emitting LED and lens

Details Side emitting LED and lens Side emitting LED and lens

2007-08-07

2007-08-07

Wong, Tina M. (Department: 2874)

Optical waveguides

Noncyclindrical or nonplanar shaped waveguide

C362S327000

Reexamination Certificate

active

11486021

ABSTRACT:
A lens of a side emitting LED includes a bottom surface, an incident surface, a reflective surface, a first refractive surface, a second refractive surface and a third refractive surface. An light emitted by a LED enters the lens through the incident surface. A portion of the light is reflected by the reflective surface in an internal total reflection manner to the second refractive surface and emits out of the lens along a first optical path. The other portion of light directly emits out of the lens through the first refractive surface and the third refractive surface. A transitive surface is located between the first refractive surface and the reflective surface. Such a design allows the light entered the lens through the incident surface not cross with the transitive surface. Hence an improper reflection or refraction can be prevented.

REFERENCES:
patent: 5898267 (1999-04-01), McDermott
patent: 6679621 (2004-01-01), West et al.
patent: 7142769 (2006-11-01), Hsieh et al.

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