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US 12,663,564 B2Granted
Optimized optical element for LED
AssigneeLumileds LLC
InventorsYu-Chen Shen, Bahareh Ramezan Pour
Life of this patent
Estimating the term…
Abstract
A lens comprises a base and a head where the base may have one or more side walls with a straight cross-section and the head may have one or more surfaces with a curved cross-section forming an apex at the top of the lens with an effective radius of curvature. The base thickness, the total thickness of the lens, and/or the effective radius of curvature may be tuned to improve emission directionality and/or light extraction efficiency of an LED over which the lens is disposed. Individual ones of the lens may be disposed over individual LEDs in an array. To reduce crosstalk.
Claims17
An optical element comprising:
- a base portion comprising a flat surface having an outer perimeter and one or more side walls angled inward toward a central axis of the base portion, the central axis oriented perpendicular to the flat surface, each side wall of the one or more side walls having a perimeter end along the outer perimeter of the flat surface and a distal end that is distal from the flat surface, the perimeter of the flat surface having a diameter of 0.5 mm to 5 mm;
- and
- an upper portion comprising one or more surfaces collectively extending from the distal end of each of the one or more side walls to form an apex centered on the central axis, the upper portion having an effective radius of curvature of 700 microns to 1100 microns at the apex,
- wherein the distance measured parallel to the central axis from the flat surface to the apex is 1000 microns to 1300 microns,
- wherein the one or more surfaces of the upper portion comprises two or more surfaces that collectively form polygonal shapes in planes perpendicular to the flat surface and including the central axis.
2 more elements
An optical element comprising:
- a base portion comprising a flat surface having an outer perimeter and a single continuous side wall extending along the outer perimeter of the flat surface and angled toward a central axis of the base portion, the central axis oriented perpendicular to the flat surface, the single continuous side wall having a perimeter end along the outer perimeter of the flat surface and a distal end that is distal from the flat surface, the single continuous side wall having circular or elliptical cross-sectional shapes in at least some planes parallel to the flat surface corresponding to the circular or elliptical shape of the outer perimeter, the perimeter of the flat surface having a diameter of 0.5 mm to 5 mm, the outer perimeter of the flat surface being circular or elliptical;
- and
- an upper portion comprising one or more surfaces collectively extending from the distal end of the single continuous side wall to form an apex centered on the central axis, the upper portion having an effective radius of curvature of 700 microns to 1100 microns at the apex;
- wherein the distance measured parallel to the central axis from the flat surface to the apex is 1000 microns to 1300 microns, and
- wherein the upper portion has a lower end extending from the distal end of the base portion, the lower end forming an inner perimeter of the optical element that is polygonal.
2 more elements
An optical element comprising:
- a base portion comprising a flat surface having an outer perimeter and one or more side walls angled inward toward a central axis of the base portion, the central axis oriented perpendicular to the flat surface, each side wall of the one or more side walls having a perimeter end along the outer perimeter of the flat surface and a distal end that is distal from the flat surface, the perimeter of the flat surface having a diameter of 0.5 mm to 5 mm;
- and
- an upper portion comprising one or more surfaces collectively extending from the distal end of each of the one or more side walls to form an apex centered on the central axis, the upper portion having an effective radius of curvature of 700 microns to 1100 microns at the apex;
- wherein the distance measured parallel to the central axis from the flat surface to the apex is 1000 microns to 1300 microns;
- and
- wherein the one or more surfaces of the upper portion includes two or more surfaces that are each a polygon.
3 more elements
Dependencies are inferred from the claim text.