Lighting device with controllable light output characteristics
AssigneeSignify Holding B.V.
InventorsErik Paul BOONEKAMP, Adrianus Johannes Stephanus Maria DE VAAN
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Abstract
A lighting device comprises a planar array of LEDs comprising a set of parallel LED strips and an optical sheet extending over and parallel to the plane of the array of LEDs. The optical sheet comprises an interleaved pattern of parallel optical strips and pass through strips and it is movable relative to the array of LEDs to create different output beam characteristics.
Claims14
A lighting device comprising:
- a planar array of LEDs comprising a set of parallel LED strips;
- an optical sheet extending over and parallel to the plane of the array of LEDs, the optical sheet comprising an interleaved pattern of parallel optical strips configured to perform a beam redirection and pass through strips, wherein the pass through strips have an average width which is at least 0.1 times the average width of the optical strips;
- a drive arrangement for moving the optical sheet relative to the array of LEDs between at least two configurations:
- a first configuration in which elongate axes of the LED strips are parallel to elongate axes of the optical strips;
- and
- a second configuration in which the elongate axes of the LED strips are angularly offset by an acute angle from the elongate axes of the optical strips.
A method of controlling a light output from a lighting device, wherein the lighting device comprises a planar array of LEDs comprising a set of parallel LED strips and an optical sheet extending over and parallel to the plane of the array of LEDs, the optical sheet comprising an interleaved pattern of parallel optical strips configured to perform a beam redirection and pass through strips, wherein the pass through strips have an average width which is at least 0.1 times the average width of the optical strips, wherein the method comprises:
- moving the optical sheet relative to the array of LEDs between at least two configurations:
- a first configuration in which elongate axes of the LED strips are parallel to elongate axes of the optical strips;
- and
- a second configuration in which the elongate axes of the LED strips are angularly offset by an acute angle from the elongate axes of the optical strips.
Dependencies are inferred from the claim text.