Lens with controlled backlight management
DCFirst 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 predominantly toward the preferential side; and
a refracting inner surface configured for refracting light from the emitter, the refracting inner surface comprising;
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 surface configuration of the front sector.
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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.
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Citations
24 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 predominantly toward the preferential side; and a refracting inner surface configured for refracting light from the emitter, the refracting inner surface comprising; 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 surface configuration of the front sector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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 comprising;
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an outer surface; a refracting inner surface configured for refracting light from the emitter, the refracting inner surface comprising; 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 surface configuration of the front sector; 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. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. 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 comprising;
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an outer surface; and a refracting inner surface configured for refracting light from the emitter, the refracting inner surface comprising; 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 surface configuration of the front sector, the back sector having substantially elliptical cross-sections in planes substantially parallel to the emitter plane.
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19. 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 comprising an outer surface and a refracting inner surface comprising:
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a front sector centered on the preferential side; and a back sector centered on a non-preferential side radially opposite the preferential side and having a surface configuration differing from a surface configuration of the front sector which has a substantially smooth surface configuration extending to the juncture of the front and back sectors. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification