Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Patent
1997-07-14
1998-12-08
Patel, Nimeshkumar
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
313483, H01J 162
Patent
active
058475079
ABSTRACT:
A process and apparatus is described to produce efficient light emission over a broad portion of the visible spectrum. A lens containing a fluorescent dye is over molded to a short wavelength light emitter (e.g., a blue LED or laser diode) placed within a reflector cup. The fluorescent dye absorbs at least a portion of the light emitted by the diode and re-emits light of a second, longer wavelength. Concentration of the dye within the lens can be varied to control the extent of a region within the lens where most of the light is re-emitted so the remaining portion of the lens can focus the light. One can readily and consistently tailor the color of the light emitted from the lens through selection of the number and types of fluorescent dyes added to the lens, and through their relative concentrations. Inventory is reduced and there are no additional steps required when building varied color LEDs. One simply controls the color of the LED being made by selecting from one of several possible fluorescent dye-containing lens epoxies.
REFERENCES:
patent: 3875456 (1975-04-01), Kano et al.
Butterworth Mark M.
Helbing Rene P.
Hewlett--Packard Company
Patel Nimeshkumar
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