Optical device for LED-based lamp
An optical device for coupling the luminous output of a light-emitting diode (LED) to a predominantly spherical pattern comprises a transfer section that receives the LED's light within it and an ejector positioned adjacent the transfer section to receive light from the transfer section and spread the light generally spherically. A base of the transfer section is optically aligned and/or coupled to the LED so that the LED's light enters the transfer section. The transfer section can comprises a compound elliptic concentrator operating via total internal reflection. The ejector section can have a variety of shapes, and can have diffusive features on its surface as well. The transfer section can in some implementations be polygonal, V-grooved, faceted and other configurations.
1. An optical device for distributing the radiant emission of a light emitter comprising:
a lower substantially cylindrical transfer section comprising a solid of dielectric;
an upper ejector section situated upon the lower transfer section, said lower transfer section operable for placement upon the light emitter and operable to transfer the radiant emission to said upper ejector section such that the radiant emission received from the light emitter enters the lower transfer section at a first end of the lower transfer section and substantially all of the radiant emission is transferred to an opposite second end of the lower transfer section to be delivered from the second end of the lower transfer section to the upper ejector section, wherein the first end is separated from the second end by a length of the lower transfer section; and
said upper ejector section shaped such that the emission is redistributed externally into a substantial solid angle, and wherein a surface of said transfer section is comprised of an array of V-grooves.
2. The optical device of claim 1 , wherein V-grooves define an exterior circumferential surface of the transfer section.
3. The optical device of claim 2 , wherein the V-grooves extend along the length of the transfer section parallel with a central rotational axis of the cylindrical transfer section.
4. The optical device of claim 2 , wherein said ejector section comprises:
a non-ejecting surface; and
a generally cylindrical ejecting surface through which the radiant emission, transferred through the transfer section to the upper ejector section, is emitted, externally into the substantial solid angle, where the cylindrical ejecting surface is parallel with a central axis of the cylindrical transfer section.
5. The optical device of claim 1 , wherein the upper ejector section further comprises a generally cylindrical ejecting surface through which the radiant emission, transferred through the transfer section to the upper ejector section, is emitted, externally into the substantial solid angle, through the cylindrical ejecting surface.
6. The optical device of claim 1 , wherein the transfer section is rotationally symmetrical about an axis; and
the upper ejector section comprising a generally cylindrical surface through which the radiant emission, transferred through the transfer section to the upper ejector section, is emitted externally into the substantial solid angle, and where the cylindrical surface is parallel with the axis.
7. The optical device of claim 6 , wherein said transfer section is generally cylindrical and the array of V-grooves defines an exterior circumferential surface of the transfer section and the V-grooves extend along the length of the transfer section parallel with the axis of the cylindrical transfer section.
8. An optical device for distributing radiant emissions of a light emitter, the optical device comprising:
a substantially cylindrical transfer section comprising a solid dielectric;
an ejector section situated upon the transfer section, said transfer section operable for placement adjacent with a light emitter and operable to transfer radiant emission from said light emitter to said ejector section such that the radiant emission received from the light emitter enters the transfer section at a first end of the transfer section and substantially all of the radiant emission is transferred to an opposite second end of the transfer section to be delivered from the second end of the transfer section to the ejector section, wherein the first end is separated from the second end by a length of the transfer section; and
said ejector section shaped such that the emission is redistributed externally into a substantial solid angle, and where a surface of said transfer section comprises an array of V-grooves.
9. The optical device of claim 8 , wherein the transfer section is rotationally symmetrical about an axis;
the upper ejector section comprising a generally cylindrical ejecting surface through which the radiant emission, transferred through the transfer section to the upper ejector section, is emitted externally into the substantial solid angle, and where the cylindrical ejecting surface is parallel with the axis.
10. The optical device of claim 8 , wherein an array of V-grooves extends about a circumference of the transfer section.
11. The optical device of claim 10 , wherein the V-grooves extend along the length of the transfer section parallel with a central rotational axis of the cylindrical transfer section.
12. An optical device for distributing radiant emissions of a light emitter, the optical device comprising:
a cylindrical transfer section that is rotationally symmetric about a central axis, where said transfer section is configured to be positioned adjacent a light emitter to receive radiant emission from said light emitter; and
an ejector section, situated upon the transfer section, rotationally symmetric about the central axis;
where said transfer section is shaped such that the radiant emission received from the light emitter enters the transfer section at a first end of the transfer section to transfer substantially all of said radiant emission received from said light emitter generally in parallel with the central axis to an opposite second end of the transfer section to be delivered from the second end of the transfer section to said ejector section, wherein the first end is separated from the second end by a length of the transfer section; and
said ejector section is shaped such that the radiant emission is redistributed externally into a substantial solid angle.
13. The optical device of claim 12 , wherein the transfer section comprises an array of V-grooves that defines an exterior surface of the transfer section.