Method and system for managing light from a light emitting diode
First Claim
1. An illumination system comprising:
- an optic comprising an interior surface that defines a cavity and an exterior surface opposite the interior surface; and
a light emitting diode mounted to emit light into in the cavity, the light emitting diode having an axis,wherein the cavity comprises an egg-shaped outline perpendicular to the axis, andwherein the optic is operable to;
transmit and emit a first portion of the emitted light that is oriented in a street side direction;
with a region of the interior surface, focus a second portion of the emitted light that is oriented in a house side direction;
with an internally reflective surface, receive the focused second portion of the emitted light and redirect the focused second portion in the street side direction;
with a region of the exterior surface, receive a third portion of the emitted light that is oriented in a house side direction and internally reflect the received third portion to a backside of the optic; and
with the backside of the optic, send street side a fraction of the internally reflected third portion.
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Accused Products
Abstract
A light source, for example a light emitting diode, can emit light and have an associated optical axis. The source can be deployed in applications where it is desirable to have illumination biased laterally relative to the optical axis, such as in a street luminaire where directing light towards a street is beneficial. The source can be coupled to an optic that comprises a cavity. At least a portion of the cavity can have an outline that is egg-shaped in cross section. A backside of the cavity (or a backside portion of the optic) can have an irregular shape for receiving the light emitting diode, for example to form a receptacle shaped to fit a circuit board on which the light emitting diode is mounted.
167 Citations
18 Claims
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1. An illumination system comprising:
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an optic comprising an interior surface that defines a cavity and an exterior surface opposite the interior surface; and a light emitting diode mounted to emit light into in the cavity, the light emitting diode having an axis, wherein the cavity comprises an egg-shaped outline perpendicular to the axis, and wherein the optic is operable to; transmit and emit a first portion of the emitted light that is oriented in a street side direction; with a region of the interior surface, focus a second portion of the emitted light that is oriented in a house side direction; with an internally reflective surface, receive the focused second portion of the emitted light and redirect the focused second portion in the street side direction; with a region of the exterior surface, receive a third portion of the emitted light that is oriented in a house side direction and internally reflect the received third portion to a backside of the optic; and with the backside of the optic, send street side a fraction of the internally reflected third portion. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An illumination system comprising:
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an optic comprising; an interior surface that defines a cavity, a backside disposed adjacent the cavity, and an exterior surface opposite the interior surface and the backside; and a light emitting diode (LED) disposed to emit light into the cavity; wherein a first area of the exterior surface is disposed at least partially on a street side of the optic and is operative to transmit a first portion of light emitted by the LED in a street side direction, wherein a region of the interior surface focuses a second portion of the light emitted by the LED in a house side direction, wherein a second area of the exterior surface is oriented to receive the second portion of light and reflect the received second portion of light in the street side direction, and wherein a third area of the exterior surface is oriented to receive a third portion of light emitted by the LED in a house side direction and to internally reflect the received third portion of light incident on the backside. - View Dependent Claims (9, 10, 11)
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12. An illumination system, comprising:
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an optic comprising; a backside; an exterior surface comprising an internally reflective surface and a first surface region; and a cavity comprising a second surface region, the cavity extending from the backside towards the exterior surface; and a light emitting diode mounted to emit light into the cavity, wherein the optic is operable to perform the steps of; transmitting through the optic a first portion of the emitted light that is oriented in a street side direction; with the second surface region, focusing a second portion of the emitted light that is oriented in a house side direction; with the internally reflective surface, receiving the focused second portion of the emitted light and redirecting the focused second portion in the street side direction; and with the first surface region, receiving a third portion of the emitted light that is oriented in a house side direction and internally reflecting the received third portion to the backside of the optic, where the backside redirects a portion of incident light street side. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification