Lens with controlled backlight management
First Claim
1. A lens for distribution of light predominantly toward a preferential side from a light emitter having an emitter axis and defining an emitter plane, comprising:
- an outer surface configured for refracting emitter light;
an emitter-adjacent base end forming an emitter-receiving opening to an emitter-surrounding cavity;
a refracting inner surface defining the emitter-surrounding cavity and including;
a front sector centered on the preferential side and having a first configuration for refracting light from the emitter; and
a back sector centered on the non-preferential side radially opposite the preferential side and having a second configuration for refracting light from the emitter, the second configuration differing from the first configuration; and
an axially-offset reflecting primary back surface positioned to receive light from at least a portion of the refracting-inner-surface back sector and configured for total internal reflection (TIR) thereof toward the lens outer surface.
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Accused Products
Abstract
A lens for distribution of light predominantly toward a preferential side from a light emitter having an emitter axis and defining an emitter plane. The lens has an emitter-adjacent base end forming an emitter-receiving opening to an emitter-surrounding cavity defined by an inner surface which includes a front sector centered on the preferential side and a back sector centered on the non-preferential side radially opposite the preferential side. The front and back sectors differ in their respective configurations for refracting light from the emitter. The lens further includes an primary back surface positioned to receive light from at least a portion of the inner-surface back sector and configured for total internal reflection (TIR) thereof. The inner-surface back sector and the primary back surface extend along substantially elliptical cross-sections in planes substantially parallel to the emitter plane. The emitter-adjacent base end forms a back opening to a back cavity substantially centered on the non-preferential side and partially bounded by the primary back surface.
194 Citations
29 Claims
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1. A lens for distribution of light predominantly toward a preferential side from a light emitter having an emitter axis and defining an emitter plane, comprising:
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an outer surface configured for refracting emitter light; an emitter-adjacent base end forming an emitter-receiving opening to an emitter-surrounding cavity; a refracting inner surface defining the emitter-surrounding cavity and including; a front sector centered on the preferential side and having a first configuration for refracting light from the emitter; and a back sector centered on the non-preferential side radially opposite the preferential side and having a second configuration for refracting light from the emitter, the second configuration differing from the first configuration; and an axially-offset reflecting primary back surface positioned to receive light from at least a portion of the refracting-inner-surface back sector and configured for total internal reflection (TIR) thereof toward the lens outer surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A lens for distribution of light predominantly toward a preferential side from a light emitter having an emitter axis and defining an emitter plane, comprising:
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an emitter-adjacent base end forming an emitter-receiving opening to an emitter-surrounding cavity; an inner surface defining the emitter-surrounding cavity and including (a) a front sector centered on the preferential side and having a first configuration for refracting light from the emitter and (b) a back sector centered on the non-preferential side radially opposite the preferential side and having a second configuration for refracting light from the emitter, the second configuration differing from the first configuration, the inner-surface front sector including; a first front region adjacent to the emitter axis and configured for refracting emitter light toward the emitter plane; a second front region spaced from the first front region and configured for refracting emitter light away from the emitter plane, the second front region terminating before reaching the emitter plane; a base-adjacent front region extending from the second front region and being configured such that the light emitted between the second front region and the emitter plane passes through the base-adjacent front region substantially free of refraction; and a middle front region joining and substantially cross-sectionally asymptotical to the first and second front regions, the middle front region being positioned with respect to the emitter to refract light toward the emitter plane by progressively lesser amounts at positions progressively closer to the second front region; and an axially-offset primary back surface positioned to receive light from at least a portion of the inner-surface back sector and configured for total internal reflection (TIR) thereof. - View Dependent Claims (25, 26)
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27. A lens for distribution of light predominantly toward a preferential side from a light emitter having an emitter axis and defining an emitter plane, comprising:
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an outer surface configured for refracting emitter light; an emitter-adjacent base end forming an emitter-receiving opening to an emitter-surrounding cavity; a refracting inner surface which defines the emitter-surrounding cavity and is configured for refracting light from the emitter, the refracting inner surface including; a front sector centered on the preferential side; and a back sector centered on the non-preferential side radially opposite the preferential side and having a surface configuration differing from a front-sector surface configuration; and a back opening to a back cavity partially bounded by a reflecting primary back surface positioned to receive light from at least a portion of the refracting-inner-surface back sector and configured for total internal reflection (TIR) thereof toward the lens outer surface. - View Dependent Claims (28)
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29. A lens for distribution of light predominantly toward a preferential side from a light emitter having an emitter axis and defining an emitter plane, comprising:
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an outer surface configured for refracting emitter light; an emitter-adjacent base end forming an emitter-receiving opening to an emitter-surrounding cavity; a refracting inner surface which defines the emitter-surrounding cavity and is configured for refracting light from the emitter, the refracting inner surface including; a front sector centered on the preferential side; and a back sector centered on the non-preferential side radially opposite the preferential side and having substantially elliptical cross-sections in planes substantially parallel to the emitter plane, a back-sector surface configuration differing from a front-sector surface configuration; and a reflecting primary back surface positioned to receive light from at least a portion of the refracting-inner-surface back sector and configured for total internal reflection (TIR) thereof toward the lens outer surface, the reflecting primary back surface having substantially elliptical cross-sections in planes substantially parallel to the emitter plane.
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Specification