Lighting device and primary optics for shaping far-field light emission of led array and method of manufacture
AssigneeLumileds LLC
InventorsJeff DIMARIA, Yu-Chen Shen, Rene Helbing, Luke Gordon
Life of this patent
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Abstract
Lighting devices, lens arrays, and method of manufacture are described herein. A lighting device includes an LED array that includes rows and columns of light-emitting diode (LED) dies on a common substrate. A lens array is disposed over the array of LED dies. The lens array includes multiple lenses, each having a bullet-shaped cross-section and disposed over a respective row of the LED dies in the LED array such that an invariant axis of each of the lenses is aligned along the row of LEDs and an axis of periodicity of the lenses is perpendicular to the invariant axis.
Claims17
A lighting device comprising:
- an LED array comprising rows and columns of light-emitting diode (LED) dies on a common substrate;
- and
- a lens array over the array of LED dies,
- wherein the lens array comprises a plurality of lenses each having a bullet-shaped cross-section and disposed over a respective row of the LED dies in the LED array such that an invariant axis of each lens is aligned along a respective row of LEDs and an axis of periodicity of the lenses is perpendicular to the invariant axis, and
- wherein each of the LED dies in the LED array is longer along the axis of periodicity than along the invariant axis.
(canceled)
-17. (canceled)
A method of manufacturing a lighting device, the method comprising:
- forming an LED array by arranging rows and columns of light-emitting diode (LED) dies on a common substrate;
- selecting an aspect ratio for the LED dies between 1.1:1 and 8:1 with each of the LED dies being longer along the axis of periodicity than along the invariant axis such that light emission from each of the LED dies appears square on direct view;
- forming a lens array to have a plurality of lenses, each having a bullet-shaped cross-section;
- aligning the lens array over the LED array such that each of the lenses is aligned along a respective row of the LEDs and an axis of periodicity of the lenses is perpendicular to the invariant axis.
(canceled)
Dependencies are inferred from the claim text.