Stacked light source
View Patent ↗A light emitting device having two stacked light generators mounted in a reflector cup. In one embodiment the light generators emit complementary colors that mix to form white light.
1. A lighting device package far producing visible light, comprising:
a) a first lead frame comprising a substrate;
b) a second lead frame comprising an electrical connector;
c) a reflector formed in the substrate and comprising a base and having a centrally-disposed optical axis associated therewith, the reflector being configured to direct light incident thereon and reflected therefrom forwardly and outwardly away therefrom;
d) a first solid-state light emitter mounted at the base of the reflector, aligned with the optical axis and electrically connected to the substrate, the first light emitter being configured to emit light of a first color both forwardly and away from the reflector and laterally and backwardly towards the reflector for reflection therefrom;
e) a second solid-state light emitter mounted above the first light emitter, aligned with the optical axis and electrically connected to the first light emitter and the second lead frame via the electrical connector, the second light emitter being configured to emit light of a second color both forwardly and away from the reflector and laterally and backwardly towards the reflector for reflection therefrom;
wherein the reflector, the first light emitter and the second light emitter are configured to mix light of the first color and the second color to produce visible light emitted by the package, and wherein the first color and the second colors are binary complements according to the C.I.E. color chart.
2. A lighting device package for producing visible light in accordance with claim 1 , wherein the light of the first color and light of the second color mix to form white light.
3. A lighting device package for producing visible light in accordance with claim 1 , wherein the reflector is shaped to maximize mixing of the light of the first color with the light of the second color.
4. A lighting device package for producing visible light in accordance with claim 1 , wherein at least one of the first light emitter and the second light emitter is a light emitting diode semiconductor die.
5. A lighting device package for producing visible light in accordance with claim 1 , wherein at least one of the first light emitter and the second light emitter is a laser diode.
6. A method for packaging a light source, comprising:
a) providing a first lead frame comprising a substrate;
b) providing a second lead frame comprising an electrical connector;
c) forming a reflector in the substrate, the reflector comprising a base and having a centrally-disposed optical axis associated therewith, the reflector being configured to direct light incident thereon and reflected therefrom forwardly and outwardly away therefrom;
d) providing a first solid-state light emitter and mounting same at a base of the reflector in alignment with the optical axis, the first light emitter being configured to emit light of a first color both forwardly and away from the reflector and laterally and backwardly towards the reflector for reflection therefrom
e) electrically connecting the first light emitter to the substrate;
f) providing a second solid-state light emitter and mounting same above the first light emitter in alignment with the optical axis, the second light emitter being configured to emit light of a second color both forwardly and away from the reflector and laterally and backwardly towards the reflector for reflection therefrom; and
g) electrically connecting the second light emitter to the first light emitter and the second lead frame via the electrical connector;
wherein the reflector, the first light emitter and the second light emitter are configured to mix light of the first color and the second color to produce visible light, and wherein the first color and the second color are binary complements according to the C.I.E. color chart.
7. A method in accordance with claim 6 , further comprising mounting a third light generator, operable to emit light of a third color, on the second light generator such that the second light generator is electrically coupled to the third light generator.
8. A method in accordance with claim 6 , wherein the light of the first color and the light of the second color combine to form white light.
9. A method in accordance with claim 6 , wherein a light generator of the first and second light generators is a light emitting diode semiconductor die.
10. A method in accordance with claim 6 , wherein a light generator of the first and second light generators is a laser diode.