Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Patent
1975-05-27
1976-11-09
Demeo, Palmer C.
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
313113, 357 17, H05B 3322
Patent
active
039913392
ABSTRACT:
An electroluminescent semiconductor device having an optical axis includes two cylindrical surface segments spaced from and opposite each other. One of the cylindrical surface segments is the light emitting surface with a center of curvature C.sub.1 and a focal point, f, on the optical axis. The other cylindrical surface segment is a light reflecting surface having a center of curvature C.sub.2 on the optical axis. The electroaluminescent device has a pair of flat surfaces, spaced from each other and substantially perpendicular to the light emitting and reflecting surfaces. On one of the flat surfaces is a first electrical contact. On a portion of the opposite flat surface is a second electrical contact which is positioned along the optical axis on or between the center of curvature C.sub.1 and the focal point f. Light is generated in the electroluminescent device in the area of the second contact. Preferably, if the focal point f and center of curvature C.sub.2 are at the same location on the optical axis the benefits to light emission are two fold. First, the light emitted from such a point will be collimated and secondly light striking the reflected surface will be reflected back to the focal point f thereby improving the possibility of its emission as collimated light.
REFERENCES:
patent: 3701047 (1972-10-01), Caplan et al.
patent: 3821775 (1974-06-01), Biard
patent: 3877052 (1975-04-01), Dixon et al.
Ettenberg Michael
Kressel Henry
Lockwood Harry Francis
Pankove Jacques Isaac
Bruestle G. H.
Calder D. N.
DeMeo Palmer C.
RCA Corporation
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