Electricity: conductors and insulators – Feedthrough or bushing – Compression
Patent
1989-05-12
1990-04-24
Edlow, Martin H.
Electricity: conductors and insulators
Feedthrough or bushing
Compression
357 17, 357 70, 357 68, 174 522, H01L 2328, H01L 3300
Patent
active
049204041
ABSTRACT:
A light-emitting diode is mounted in the bottom of a cavity in a metal lead and the assembly is potted in a transparent plastic material. The walls of the cavity surround the sides of the light-emitting diode in sufficiently close proximity to effectively shield the light-emitting diode from thermal expansion stresses from the plastic potting material which would induce light output degradation. Such a cavity may be a right-circular cylinder with a diameter less than 75 micrometers greater than the largest transverse dimension of the light-emitting diode. The front face of the light-emitting diode may be flush or beneath the face of the metal lead for minimizing stress. The cavity may be deep enough that the front face of the light-emitting diode is closer to the bottom of the cavity than to its open end. The front face may protrude beyond the open end of the cavity and be surrounded by a reflective surface. The edges of the front face of the light-emitting diode may be beveled for minimizing stress.
REFERENCES:
patent: 3676668 (1972-07-01), Collins et al.
patent: 3914786 (1975-10-01), Grossi
patent: 4267559 (1981-05-01), Johnson et al.
McLeod Cheryl L.
Shrimali Dinesh C.
Steranka Frank M.
Barrett Patrick J.
Edlow Martin H.
Hewlett--Packard Company
Monin Donald L.
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