Illumination – Modifier mountable on light source envelope – With additional modifier
Patent
1991-04-15
1992-06-16
Lazarus, Ira S.
Illumination
Modifier mountable on light source envelope
With additional modifier
362248, 362800, 362363, F21V 1310
Patent
active
051229439
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
))], wherein r is the radius of a spherical dome portion, x<arcsin (1
) is the maximum angle between a surface normal and a ray emitted from the active light emitting element that strikes the envelope at the edge of the exposed portion of the spherical dome portion, s is the distance between the active light emitting element and the center of the spherical dome portion, and n is the index of refraction of the material of the epoxy envelope.
REFERENCES:
patent: 4698730 (1987-10-01), Sakai et al.
patent: 4712163 (1987-12-01), Oxley
patent: 4733335 (1988-03-01), Serizewe et al.
patent: 4742432 (1988-05-01), Thillays et al.
patent: 5001609 (1991-03-01), Gardner et al.
Coe Roger N.
Lazarus Ira S.
Miles Inc.
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