Illumination devices including multiple light emitting elements
First Claim
1. An illumination device comprising:
- a substrate having first and second opposing surfaces, such that each of the first and second surfaces are elongated and have a longitudinal dimension and a transverse dimension shorter than the longitudinal dimension;
a plurality of light-emitting elements (LEE) arranged on the first surface of the substrate and distributed along the longitudinal dimension, such that the LEEs emit, during operation, light in a first angular range with respect to a normal to the first surface of the substrate;
one or more primary optics arranged in an elongated configuration along the longitudinal dimension of the first surface and coupled with the LEEs, the one or more primary optics being shaped to redirect light received from the LEEs in the first angular range, and to provide the redirected light in a second angular range, a divergence of the second angular range being smaller than a divergence of the first angular range at least in a plane perpendicular to the longitudinal dimension of the first surface of the substrate;
a secondary optic comprising a redirecting surface elongated along the longitudinal dimension,wherein the secondary optic is (i) spaced apart from the one or more of the primary optics by a first distance along a prevalent direction of propagation of light of the second angular range, and (ii) oriented relative to the one or more of the primary optics such that the redirecting surface of the secondary optic faces the one or more of the primary optics,wherein the first distance and the divergence of the second angular range are configured such that the light provided by the one or more primary optics in the second angular range impinges on the redirecting surface,wherein first and second portions of the redirecting surface reflect at least some of the light that impinges thereon, and provide the reflected light in third and fourth angular ranges with respect to the normal to the first surface of the substrate, respectively, andwherein at least prevalent directions of propagation of light of the third and fourth angular ranges are different from each other and from the prevalent direction of propagation of light of the second angular range at least perpendicular to the longitudinal dimension of the first surface of the substrate; and
a tertiary optic comprising a first reflector elongated along the longitudinal dimension,wherein the first reflector is spaced apart from the secondary optic and faces the first portion of the redirecting surface of the secondary optic,wherein the first reflector is shaped to reflect at least some of the light provided by the first portion of the redirecting surface of the secondary optic in the third angular range as first reflected light in a fifth angular range with respect to the normal to the first surface of the substrate, andwherein the fifth angular range is different than the third angular range, such that a first portion of an intensity distribution output by the illumination device during operation includes at least some of the first reflected light.
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Accused Products
Abstract
A variety of illumination devices are disclosed that are configured to manipulate light provided by one or more light-emitting elements (LEEs). In general, embodiments of the illumination devices feature one or more optical couplers that redirect illumination from the LEEs to a reflector which then directs the light into a range of angles. In some embodiments, the illumination device includes a second reflector that reflects at least some of the light from the first reflector. In certain embodiments, the illumination device includes a light guide that guides light from the collector to the first reflector. The components of the illumination device can be configured to provide illumination devices that can provide a variety of intensity distributions. Such illumination devices can be configured to provide light for particular lighting applications, including office lighting, task lighting, cabinet lighting, garage lighting, wall wash, stack lighting, and downlighting.
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Citations
30 Claims
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1. An illumination device comprising:
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a substrate having first and second opposing surfaces, such that each of the first and second surfaces are elongated and have a longitudinal dimension and a transverse dimension shorter than the longitudinal dimension; a plurality of light-emitting elements (LEE) arranged on the first surface of the substrate and distributed along the longitudinal dimension, such that the LEEs emit, during operation, light in a first angular range with respect to a normal to the first surface of the substrate; one or more primary optics arranged in an elongated configuration along the longitudinal dimension of the first surface and coupled with the LEEs, the one or more primary optics being shaped to redirect light received from the LEEs in the first angular range, and to provide the redirected light in a second angular range, a divergence of the second angular range being smaller than a divergence of the first angular range at least in a plane perpendicular to the longitudinal dimension of the first surface of the substrate; a secondary optic comprising a redirecting surface elongated along the longitudinal dimension, wherein the secondary optic is (i) spaced apart from the one or more of the primary optics by a first distance along a prevalent direction of propagation of light of the second angular range, and (ii) oriented relative to the one or more of the primary optics such that the redirecting surface of the secondary optic faces the one or more of the primary optics, wherein the first distance and the divergence of the second angular range are configured such that the light provided by the one or more primary optics in the second angular range impinges on the redirecting surface, wherein first and second portions of the redirecting surface reflect at least some of the light that impinges thereon, and provide the reflected light in third and fourth angular ranges with respect to the normal to the first surface of the substrate, respectively, and wherein at least prevalent directions of propagation of light of the third and fourth angular ranges are different from each other and from the prevalent direction of propagation of light of the second angular range at least perpendicular to the longitudinal dimension of the first surface of the substrate; and a tertiary optic comprising a first reflector elongated along the longitudinal dimension, wherein the first reflector is spaced apart from the secondary optic and faces the first portion of the redirecting surface of the secondary optic, wherein the first reflector is shaped to reflect at least some of the light provided by the first portion of the redirecting surface of the secondary optic in the third angular range as first reflected light in a fifth angular range with respect to the normal to the first surface of the substrate, and wherein the fifth angular range is different than the third angular range, such that a first portion of an intensity distribution output by the illumination device during operation includes at least some of the first reflected light. - View Dependent Claims (2, 3, 5, 6, 7, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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4. An illumination device comprising:
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a substrate having first and second opposing surfaces, such that each of the first and second surfaces are elongated and have a longitudinal dimension and a transverse dimension shorter than the longitudinal dimension; a plurality of light-emitting elements (LEE) arranged on the first surface of the substrate and distributed along the longitudinal dimension, such that the LEEs emit, during operation, light in a first angular range with respect to a normal to the first surface of the substrate; one or more primary optics arranged in an elongated configuration along the longitudinal dimension of the first surface and coupled with the LEEs, the one or more primary optics being shaped to redirect light received from the LEEs in the first angular range, and to provide the redirected light in a second angular range, a divergence of the second angular range being smaller than a divergence of the first angular range at least in a plane perpendicular to the longitudinal dimension of the first surface of the substrate; a secondary optic comprising a redirecting surface elongated along the longitudinal dimension, the redirecting surface of the secondary optic being spaced apart from and facing the one or more of the primary optics, wherein first and second portions of the redirecting surface reflect light received from the one or more primary optics in the second angular range, and provide the reflected light in third and fourth angular ranges with respect to the normal to the first surface of the substrate, respectively, wherein at least prevalent directions of the third and fourth angular ranges are different from each other and from a prevalent direction of propagation of light of the second angular range at least perpendicular to the longitudinal dimension of the first surface of the substrate; and a tertiary optic comprising a first reflector elongated along the longitudinal dimension, the first reflector optic being spaced apart from and facing the first portion of the redirecting surface of the secondary optic, wherein the first reflector is thermally coupled with the substrate, wherein the first reflector is shaped to reflect at least some of the light provided by the first portion of the redirecting surface of the secondary optic in the third angular range with respect to the normal of the first surface of the substrate as first reflected light in a fifth angular range with respect to the normal to the first surface of the substrate, wherein the fifth angular range is different than the third angular range, such that a first portion of an intensity distribution output by the illumination device during operation includes at least some of the first reflected light.
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8. An illumination device comprising:
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a substrate having first and second opposing surfaces, such that each of the first and second surfaces are elongated and have a longitudinal dimension and a transverse dimension shorter than the longitudinal dimension; a plurality of light-emitting elements (LEE) arranged on the first surface of the substrate and distributed along the longitudinal dimension, such that the LEEs emit, during operation, light in a first angular range with respect to a normal to the first surface of the substrate; one or more primary optics arranged in an elongated configuration along the longitudinal dimension of the first surface and coupled with the LEEs, the one or more primary optics being shaped to redirect light received from the LEEs in the first angular range, and to provide the redirected light in a second angular range, a divergence of the second angular range being smaller than a divergence of the first angular range at least in a plane perpendicular to the longitudinal dimension of the first surface of the substrate; a secondary optic comprising a redirecting surface elongated along the longitudinal dimension, the redirecting surface of the secondary optic being spaced apart from and facing the one or more of the primary optics, wherein first and second portions of the redirecting surface reflect light received from the one or more primary optics in the second angular range, and provide the reflected light in third and fourth angular ranges with respect to the normal to the first surface of the substrate, respectively, wherein at least prevalent directions of the third and fourth angular ranges are different from each other and from a prevalent direction of propagation of light of the second angular range at least perpendicular to the longitudinal dimension of the first surface of the substrate; and a tertiary optic comprising a first reflector elongated along the longitudinal dimension, the first reflector optic being spaced apart from and facing the first portion of the redirecting surface of the secondary optic, wherein the first reflector is shaped to reflect at least some of the light provided by the first portion of the redirecting surface of the secondary optic in the third angular range with respect to the normal of the first surface of the substrate as first reflected light in a fifth angular range with respect to the normal to the first surface of the substrate, wherein the fifth angular range is different than the third angular range, such that a first portion of an intensity distribution output by the illumination device during operation includes at least some of the first reflected light, wherein a first parameter combination comprises (i) an intensity distribution of the first angular range, (ii) a shape of the one or more primary optics, and (iii) a shape of the first portion of the redirecting surface and an orientation thereof, the first parameter combination determining the fifth angular range, wherein the first parameter combination is tailored such that the fifth angular range matches a predefined fifth angular range; wherein a second parameter combination comprises (iv) an intensity distribution of the first angular range, (v) a shape of the one or more primary optics, and (vi) a shape of the second portion of the redirecting surface and an orientation thereof, the second parameter combination determining the fourth angular range, wherein the second parameter combination is tailored such that the fourth angular range matches a predefined fourth angular range; and wherein a relative offset of the first and second portions of the redirecting surface with respect to the second angular range determines a relative distribution of light between the fifth angular range and the fourth angular range, wherein the relative offset is selected such that the relative distribution matches a predefined relative distribution.
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Specification