Portable luminaire
A portable luminaire includes an optical module, a power source and a housing. The optical module has at least one light emitting diode (LED) that emits light with a wide divergence, a non-imaging optical element and a transparent window. The non-imaging optical element (NIO) has a refractive member located around a LED optical axis and a total internal reflection member located around the refractive member. The refractive member and the total internal reflection member are integrated in a single transparent element having a mutual focal point. The NIO element collects a significant amount of light emitted by the LED with wide divergence located at the focal point to compress the collected light with high efficiency into a required pattern with a generally different angular distribution in a horizontal plane and a vertical plane, and to direct the compressed light outside of the luminaire.
1. An optical module including:
at least one light emitting diode (LED) that emits light with a wide divergence; and
a non-imaging optical element (NIO) that collects light emitted by the LED with high efficiency, compresses the collected light and directs the compressed light with a precalculated intensity distribution across a pattern, wherein the NIO further includes
a first member located around a LED optical axis having a first end that collects light from the LED and a second end opposite the first end to transmit light;
a second member located around the first member, wherein the second member has a first end to collect light and a second end opposite the first end to transmit light, and a wall formed therebetween, wherein an surface of the wall is curved to reflect light through the second end with a precalculated divergence that does not exceed a maximum angle;
wherein the first member and the second member are integrated into a single element having a mutual focal point;
wherein the optical module further comprises a plurality of LEDs;
wherein the NIO element compresses light into a required pattern only in a vertical plane;
wherein the optical module provides a linear pattern in a horizontal plane; and
wherein the NIO element is shaped as rectangular bar in a horizontal cross-section and the plurality of LEDs are connected to an inner side of the bar at a distance from the first end of the first member equal to the focal length of the NIO element, and the LED axes located in a horizontal plane perpendicular to the rectangular bar longitudinal axis.
2. The optical module of claim 1 , wherein the surface of the reflecting wall is curved as a arbitrary function of LED spatial intensity distribution and precalculated intensity distribution across the pattern.
3. The optical module of claim 2 , wherein light reflecting surface satisfies an equation:
z
=
cy
2
1
+
1
-
(
1
+
k
)
c
2
y
2
+
F
(
y
)
,
where z is a coordinate along an axis parallel to the optical axis, y is a coordinate on an axis perpendicular to both the optical axis and an longitudinal axis, k is a constant, c is a curvature, and F(y) is a variable function.
4. The optical module of claim 1 , wherein the NIO element comprises of transparent material with index of refraction greater that 1, and light reflecting surface is a total internal reflection (TIR) surface.
5. The optical module of claim 1 , wherein the first member of NIO element comprises of transparent material with index of refraction equal or about 1, and light reflecting surface comprises of material with index of refraction greater that 1.
6. The optical module of claim 5 , wherein the light reflecting surface comprises of reflective material.
7. A luminaire comprising a plurality of optical modules, each optical module associated with an optical axis and comprising a linearly projected cross-section; and
for each module, at least one LED positioned such that a central light emitting axis of the at least one LED is angled at about 0° relative to the optical axis associated with this module,
wherein each optical module including
at least one light emitting diode (LED) that emits light with a wide divergence; and
a non-imaging optical element (NIO) that collects light emitted by the LED with high efficiency, compresses the collected light and directs the compressed light with a precalculated intensity distribution across a pattern, wherein the NIO further includes
a first member located around a LED optical axis having a first end that collects light from the LED and a second end opposite the first end to transmit light;
a second member located around the first member, wherein the second member has a first end to collect light and a second end opposite the first end to transmit light, and a wall formed therebetween, wherein an surface of the wall is curved to reflect light through the second end with a precalculated divergence that does not exceed a maximum angle;
wherein the first member and the second member are integrated into a single element having a mutual focal point;
wherein the optical module further comprises a plurality of LEDs;
wherein the NIO element compresses light into a required pattern only in a vertical plane;
wherein the optical module provides a linear pattern in a horizontal plane; and
wherein the NIO element is shaped as rectangular bar in a horizontal cross-section and the plurality of LEDs are connected to an inner side of the bar at a distance from the first end of the first member equal to the focal length of the NIO element, and the LED axes located in a horizontal plane perpendicular to the rectangular bar longitudinal axis.