COLOR-VARIABLE LED LIGHT, PARTICULARLY FOR LIGHTING THE INTERIOR OF VEHICLES
First Claim
1. An LED light, particularly for use as a reading or seat light in vehicles, said LED light comprising:
- a housing (36),a plurality of LEDs comprising first LEDs (16) emitting electromagnetic radiation in a first wavelength range,a drive unit (12) for activating said first LEDs (16), anda conversion material (24) which, when excited by at least a fraction of the electromagnetic radiation of the first LEDs (16), emits electromagnetic radiation in a conversion wavelength range which is in the visible range of the spectrum and is at least partially different from the first wavelength range,wherein the plurality of LEDs further comprise at least second LEDs (18) which, for effecting a color shifting of the electromagnetic radiation emitted by the conversion material (24) upon its excitation by the electromagnetic radiation emitted by the first LEDs (16), emit electromagnetic radiation in a second wavelength range,the first and second LEDs (16,18), provided as semiconductor components with a common substrate (14) having arranged above it a layer of the conversion material (24) with an exit side (25) facing away from the substrate (14), are configured in such a manner that the space angle regions (27) of the radiation emitted by the individual LEDs at least contact each other before the exit side (25) of said layer of the conversion material (24),that, by means of the drive unit (12), the second LEDs (18) can optionally be driven in addition to the first LEDs (16),the electromagnetic radiation of the second LEDs (18) being at least partially in the visible range of the spectrum and at least partially different from the wavelength range of the first LEDs (16) and passing the conversion material (24) substantially without exciting the same, andthe electromagnetic radiation of the second LEDs (18) additionally exciting the conversion material (24) to cause the conversion material (24) to emit electromagnetic radiation whose wavelength range is within or outside the conversion wavelength range.
1 Assignment
0 Petitions
Accused Products
Abstract
The invention relates to an LED light, particularly a reading or seat lamp for vehicles such as travel coaches or airplanes, said light being equipped with a housing (36), a plurality of LEDs comprising first LEDs (16) that transmit electromagnetic radiation in a first wavelength range, and an activation unit (12) for activating the first LEDs (16). The LED light further comprises a conversion material (24) that, upon excitation by at least part of the electromagnetic radiation from the first LEDs (1.6), emits electromagnetic radiation in a conversion wavelength range that is in the visible spectrum range and is at least partially different from the first wavelength range. The LEDs further comprise second LEDs (18) that, in order to shift the color of the electromagnetic radiation emitted by the conversion material (24) upon excitation by the electromagnetic radiation emitted by the first LEDs (16), emit electromagnetic radiation in a second wavelength range. The second LEDs (18) may be selectively activated by the activation unit (12) in addition to the first LEDs (16), wherein the electromagnetic radiation from the second LEDs (18) is at least partially in the visible spectrum range and is at least partially different from the wavelength range of the first LEDs (16) and passes the conversion material (24) substantially without exciting said conversion material and/or wherein the electromagnetic radiation of the second LEDs (18) additionally excites the conversion material (24) to emit electromagnetic radiation, the wavelength range of which is inside or outside of the conversion wavelength range.
-
Citations
12 Claims
-
1. An LED light, particularly for use as a reading or seat light in vehicles, said LED light comprising:
-
a housing (36), a plurality of LEDs comprising first LEDs (16) emitting electromagnetic radiation in a first wavelength range, a drive unit (12) for activating said first LEDs (16), and a conversion material (24) which, when excited by at least a fraction of the electromagnetic radiation of the first LEDs (16), emits electromagnetic radiation in a conversion wavelength range which is in the visible range of the spectrum and is at least partially different from the first wavelength range, wherein the plurality of LEDs further comprise at least second LEDs (18) which, for effecting a color shifting of the electromagnetic radiation emitted by the conversion material (24) upon its excitation by the electromagnetic radiation emitted by the first LEDs (16), emit electromagnetic radiation in a second wavelength range, the first and second LEDs (16,18), provided as semiconductor components with a common substrate (14) having arranged above it a layer of the conversion material (24) with an exit side (25) facing away from the substrate (14), are configured in such a manner that the space angle regions (27) of the radiation emitted by the individual LEDs at least contact each other before the exit side (25) of said layer of the conversion material (24), that, by means of the drive unit (12), the second LEDs (18) can optionally be driven in addition to the first LEDs (16), the electromagnetic radiation of the second LEDs (18) being at least partially in the visible range of the spectrum and at least partially different from the wavelength range of the first LEDs (16) and passing the conversion material (24) substantially without exciting the same, and the electromagnetic radiation of the second LEDs (18) additionally exciting the conversion material (24) to cause the conversion material (24) to emit electromagnetic radiation whose wavelength range is within or outside the conversion wavelength range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. An LED light comprising:
-
a housing; a first plurality of LEDs contained within said housing, said first plurality of LEDs being capable of emitting electromagnetic radiation in a first wavelength range; a second plurality of LEDs contained within said housing, said second plurality of LEDs being capable of emitting electromagnetic radiation in a second wavelength range at least partially in the visible spectrum and at least partially different from the first wavelength range; a conversion material which, when excited by electromagnetic radiation in the first wavelength range, emits electromagnetic radiation in a conversion wavelength range which is in the visible range of the spectrum and is at least partially different from the first wavelength range, said conversion material covering said first and second pluralities of LEDs; said first and second plurality of LEDs configured so that the space angle region of radiation emitted by at least one of said first plurality of LEDs overlaps the space angle region of radiation emitted by at least one of said second plurality of LEDs when passing through said conversion material; and a drive device for selectively driving said first plurality of LEDs at a first duty cycle and said second plurality of LEDs at a second duty cycle. - View Dependent Claims (10, 11, 12)
-
Specification