Encapsulated light emitting diode and method for encapsulation
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United States of America Patent
Stats
-
Jun 16, 1992
Grant Date -
N/A
app pub date -
Apr 15, 1991
filing date -
Apr 15, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A light emitting diode with reduced stray light includes a base with an active light emitting element mounted in the base. An epoxy envelope is mounted on the base. The envelope includes a conical side portion and a spherical dome portion. The envelope is encapsulated with optically absorbing material of low reflectivity. The optically absorbing material is in direct contact with the side portion of the envelope and part of the spherical dome portion leaving an exposed portion through which rays of light pass. The diameter d of the exposed portion is equal to: 2r[sin (x+arcsin (r/s/n))], wherein r is the radius of a spherical dome portion, x
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