Lighting device with optimized decoupling surface
First Claim
1. A lighting device comprising a light source that emits incoherent light with a total radiation power P and has a radiation-emitting area (S) divided into a plurality of subareas (Si), wherein assigned to each subarea (Si) is a light ray having a radiation power Pi, and the sum of the radiation powers Pi is equal to the total radiation power P, and disposed after said light source is an optical element having a decoupling surface and a total reflection angle (θ
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c) assigned to said decoupling surface, said decoupling surface being shaped so that at least for a portion of the light rays, the angle (α
) of incidence on said decoupling surface is smaller than said total reflection angle (θ
c), and the radiation power of said light rays collectively is greater than a predetermined fraction q of said total radiation power P.
1 Assignment
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Accused Products
Abstract
The invention relates to a lighting device comprising a light source (1) that emits incoherent light with a total radiation power P and has a radiation-emitting area (S) divided into a plurality of subareas (Si), wherein assigned to each subarea (Si) is a light ray (2) having a radiation power Pi and the sum of the radiation powers Pi is equal to the total radiation power P, and disposed after said light source (1) is an optical element (4) having a decoupling surface (5) and a total reflection angle (θc) assigned to said decoupling surface (5), said decoupling surface (5) being shaped so that at least for a portion of said light rays (2) the angle (α) of incidence on said decoupling surface (5) is smaller than the total reflection angle (θc), and the radiation power of said light rays collectively is greater than a predetermined fraction, equal to at least 50%, of the total radiation power P.
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Citations
31 Claims
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1. A lighting device comprising a light source that emits incoherent light with a total radiation power P and has a radiation-emitting area (S) divided into a plurality of subareas (Si),
wherein assigned to each subarea (Si) is a light ray having a radiation power Pi, and the sum of the radiation powers Pi is equal to the total radiation power P, and disposed after said light source is an optical element having a decoupling surface and a total reflection angle (θ -
c) assigned to said decoupling surface, said decoupling surface being shaped so that at least for a portion of the light rays, the angle (α
) of incidence on said decoupling surface is smaller than said total reflection angle (θ
c), and the radiation power of said light rays collectively is greater than a predetermined fraction q of said total radiation power P. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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c) assigned to said decoupling surface, said decoupling surface being shaped so that at least for a portion of the light rays, the angle (α
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2. A lighting device comprising a light source that emits incoherent light with a total radiation power P and has a radiation-emitting area (S) divided into a plurality of subareas (Si),
wherein assigned to each subarea (Si) is a light ray bundle comprising a plurality of light rays of radiation power Pij, and the sum of said radiation powers Pij is equal to said total radiation power P, and disposed after said light source is an optical element having a decoupling surface and a total reflection angle (θ -
c) assigned to said decoupling surface, said decoupling surface being shaped so that at least for a portion of said light rays the angle (α
) of incidence on said decoupling surface is smaller than said total reflection angle (θ
c), and the radiation power of said light rays collectively is greater than a predetermined fraction q of said total radiation power P. - View Dependent Claims (3, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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c) assigned to said decoupling surface, said decoupling surface being shaped so that at least for a portion of said light rays the angle (α
Specification