LED engine for emergency lighting

Patent metadata

Field	Value
Publication number	US-9797565-B2
Application number	US-201313975928-A
Country	US
Kind code	B2
Filing date	Aug 26, 2013
Priority date	Oct 31, 2012
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

A light engine for a lighting fixture includes a bracket, with multiple mounting surfaces configured at different angles to form a substantially concave region, and a plurality of light emitting diode (LED) modules mounted to the multiple mounting surfaces to project an axis of a light beam from each of the plurality of LED modules along substantially a same illuminating plane. The light engine includes a first set of lenses with a first type of optical surface for focusing a first portion of the plurality of LED modules and a second set of lenses with a second type of optical surface, different than the first type, for focusing a second portion of the plurality of LED modules.

First claim

What is claimed is:

1. A light engine for an emergency lighting fixture, comprising:
a bracket including:
five adjoining mounting surfaces, each of the adjoining mounting surfaces configured to receive a printed circuit board with one light emitting diode (LED) module and a lens, and each of the adjoining mounting surfaces configured at different angles to form a concave region extending from a distal first end of the bracket to an opposing second distal end of the bracket along a two-dimensional illuminating plane, and
multiple flanges extending at an angle from at least some of the adjoining mounting surfaces, wherein each of the multiple flanges includes mounting holes to provide a point of attachment to a housing, the housing configured to provide an external enclosure for at least the light engine;

a first LED module and a first lens mounted to a first of the adjoining mounting surfaces, the first LED module projecting an axis of a first light beam through the first lens, and in the two-dimensional illuminating plane, at an angle of 60 degrees relative to a bisecting line of the concave region in the two-dimensional illuminating plane;
a second LED module and a second lens mounted to a second of the adjoining mounting surfaces, the second LED module projecting an axis of a second light beam through the second lens, and in the two-dimensional illuminating plane, at an angle of 45 degrees relative to the bisecting line;
a third LED module and a third lens mounted to a third of the adjoining mounting surfaces, the third LED module projecting an axis of a third light beam through the third lens, and in the two-dimensional illuminating plane, at an angle of −45 degrees relative to the bisecting line;
a fourth LED module and a fourth lens mounted to a fourth of the adjoining mounting surfaces, the fourth LED module projecting an axis of a fourth light beam through the fourth lens, and in the two-dimensional illuminating plane, at an angle of −60 degrees relative to the bisecting line; and
a fifth LED module and a fifth lens mounted to a fifth of the adjoining mounting surfaces, the fifth LED module projecting an axis of a fifth light beam through the fifth lens, and in the two-dimensional illuminating plane, along the bisecting line,
wherein the first lens and the fourth lens include a first type of optical surface that provides narrow beam light distribution,
wherein the second lens and the third lens include a second type of optical surface that provides elliptical beam or wide beam light distribution,
wherein the light engine projects the axes of first, second, third, fourth, and fifth light beams, in the two-dimensional illuminating plane through an exterior opening of the housing that is smaller than a width of the concave region from the first distal end to the second distal end across the adjoining mounting surfaces of the bracket, and
wherein the light engine for the emergency light fixture includes no reflectors.

2. The light engine of claim 1 , wherein each of the adjoining mounting surfaces are orthogonal to the two-dimensional illuminating plane.

3. The light engine of claim 1 , wherein the bracket is configured to act as a heat sink for the LED modules.

4. The light engine of claim 3 , wherein the bracket is configured to be mounted to the housing to provide thermal conductivity to the housing.

5. The light engine of claim 1 , wherein the light engine is configured to be installed in the housing so that the axes of the first, second, third, fourth, and fifth light beams intersect each other within the housing for the light engine.

6. The light engine of claim 1 , wherein the light engine is configured so that the axes of the first, second, third, fourth, and fifth light beams intersect each other within a width of the concave region.

7. The light engine of claim 1 , wherein the fifth lens includes the first type of optical surface that provides elliptical beam or wide beam light distribution.

8. An emergency lighting fixture, comprising:
a housing configured to be mounted on a vertical wall surface, the housing including a thermally conductive material and an exterior opening;
a window secured within the exterior opening; and
a light engine including:
a bracket with multiple mounting surfaces, each of the multiple mounting surfaces being configured to receive a light emitting diode (LED) module and a lens and to direct an axis of a light beam from the LED module through the lens in a two-dimensional illuminating plane, wherein the multiple mounting surfaces form a substantially concave region extending from a distal first end of the bracket to an opposing second distal end of the bracket along the two-dimensional illuminating plane, and wherein the bracket is mounted to the housing,
a first LED module and a first lens mounted to a first of the multiple mounting surfaces, the first LED module projecting an axis of a first light beam through the first lens, and in the two-dimensional illuminating plane, at a first angle relative to a bisecting line of the concave region in the two-dimensional illuminating plane,
a second LED module and a second lens mounted to a second of the multiple mounting surfaces, the second LED module projecting an axis of a second light beam through the second lens, and in the two-dimensional illuminating plane, at a second angle relative to the bisecting line,
a third LED module and a third lens mounted to a third of the multiple mounting surfaces, the third LED module projecting an axis of a third light beam through the third lens, and in the two-dimensional illuminating plane, at a third angle relative to the bisecting line,
a fourth LED module and a fourth lens mounted to a fourth of the multiple mounting surfaces, the fourth LED module projecting an axis of a fourth light beam through the fourth lens, and in the two-dimensional illuminating plane, at a fourth angle relative to the bisecting line, and
a fifth LED module and a fifth lens mounted to a fifth of the multiple mounting surfaces, the fifth LED module projecting an axis of a fifth light beam through the fifth lens, and in the two-dimensional illuminating plane, along the bisecting line,
wherein the first lens and the fourth lens include a first type of optical surface that provides narrow beam light distribution,
wherein the second lens and the third lens include a second type of optical surface that provides elliptical beam or wide beam light distribution, and

wherein the two-dimensional illuminating plane is angled downward and away from the vertical wall surface at an angle of between 10 and 45 degrees,
wherein a width of the window in the two-dimensional illuminating plane is less than a width of the concave region from the first distal end to the second distal end across the adjoining mounting surfaces of the bracket, and
wherein the light engine for the emergency light fixture includes no reflectors.

9. The emergency lighting fixture of claim 8 , wherein the bracket includes another thermally conductive material and wherein the bracket conducts heat from the LED modules to the housing.

10. The emergency lighting fixture of claim 8 , wherein the fifth lens includes the first type of optical surface that provides elliptical beam or wide beam light distribution.

11. The emergency lighting fixture of claim 8 , wherein the axes of the first, second, third, fourth, and fifth light beams intersect each other within the housing.

12. An emergency lighting fixture, comprising:
a housing configured to be mounted on a vertical wall surface, the housing including a thermally conductive material and an exterior opening;
a window secured within the exterior openin

Assignees

• Thomas & Betts Int Llc

Inventors

• Rapeanu Radu C

Classifications

• F21V5/04

  of lens shape · CPC title

• F21Y2107/10

  on concave supports or substrates, e.g. on the inner side of bowl-shaped supports · CPC title

• F21S9/022 Primary

  Emergency lighting devices · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title