LIGHTING DEVICE WITH EFFICIENT LIGHT-SPREADING LENS SYSTEM
First Claim
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1. A lighting device, comprising:
- a light emitting diode (LED) having a main axis of light emission; and
a lens element positioned adjacent the LED, the lens element having a geometry defined by at least partial revolution of a cross-sectional profile around an axis of revolution;
the lens element positioned relative to the LED such that said axis of revolution crosses the main axis of light emission of the LED, the lens element operative to apply total internal reflection to at least some light rays emitted from the LED.
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Abstract
A lighting device includes a light emitting diode (LED) that has a main axis of light emission. The lighting device also includes a lens element positioned adjacent the LED. The lens element has a geometry defined by at least partial revolution of a cross-sectional profile around an axis of revolution. The lens element is positioned relative to the LED such that the axis of revolution crosses the main axis of light emission of the LED. The lens element is operative to apply total internal reflection to at least some light rays emitted from the LED.
27 Citations
20 Claims
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1. A lighting device, comprising:
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a light emitting diode (LED) having a main axis of light emission; and a lens element positioned adjacent the LED, the lens element having a geometry defined by at least partial revolution of a cross-sectional profile around an axis of revolution; the lens element positioned relative to the LED such that said axis of revolution crosses the main axis of light emission of the LED, the lens element operative to apply total internal reflection to at least some light rays emitted from the LED. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A lighting device, comprising:
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an elongate support member; a plurality of LEDs (light emitting diodes) mounted along the support member, each of the LEDs having a respective main axis of light emission; and a plurality of lens elements, each mounted on the support member at a location such that each lens element substantially surrounds a respective one of the LEDs, the lens elements substantially identical to each other, each of the lens elements having a geometry defined by at least partial revolution of a cross-sectional profile around an axis of revolution; each of the lens elements positioned relative to the respective LED surrounded by said each lens element such that the axis of revolution that defines the geometry of said each lens element crosses the respective main axis of light emission of the respective LED surrounded by said each lens element, each of the lens elements operative to apply total internal reflection to at least some light rays emitted from the respective LED surrounded by said each lens element. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A refrigerator, comprising:
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an enclosed, refrigerated space; a plurality of shelves in the refrigerated space for holding items to be refrigerated; a plurality of doors for permitting access to the shelves; a plurality of vertically extending mullions interspersed among the doors, each mullion including an interior surface that faces inwardly relative to the enclosed refrigerated space; and a plurality of lighting devices, each installed on the interior surface of a respective one of the mullions; wherein each of the lighting devices includes; an elongate support member that is vertically oriented and mounted on the respective one of the mullions; and a plurality of LEDs (light emitting diodes) mounted along the support member, each of the LEDs having a respective main axis of light emission, the respective main axis of light emission of each LED oriented horizontally and directly away from the respective one of the mullions; and a plurality of lens elements, each mounted on the support member at a location such that each lens element substantially surrounds a respective one of the LEDs, the lens elements substantially identical to each other, each of the lens elements having a geometry defined by at least partial revolution of a cross-sectional profile around an axis of revolution; each of the lens elements positioned relative to the respective LED surrounded by said each lens element such that the axis of revolution that defines the geometry of said each lens element crosses the respective main axis of light emission of the respective LED surrounded by said each lens element, each of the lens elements operative to apply total internal reflection to at least some light rays emitted from the respective LED surrounded by said each lens element. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification