# US 2014/0153235 A1 · LED-Based Luminaire

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- Number: US 2014/0153235 A1
- Document ID: US20140153235A1
- Status: Published application
- Kind: A1
- Application number: 13/706,047
- Filed: 2012-12-05
- Published: 2014-06-05
- Earliest claimed: 2012-12-05
- Assignees: Cooper Technologies Company
- Inventors: Landon Brooks Gennetten; Anthony Ryan Gibbs; James Richard Christ
- Web page: https://patentgrep.com/patent/US20140153235A1

## CPC

- F21V 5/02: of prismatic shape (F21V5/04 takes precedence)
- F21V 5/04: of lens shape
- F21Y 2105/10: comprising a two-dimensional [2D] array of point-like light-generating elements
- F21Y 2115/10: Light-emitting diodes [LED]
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED

## Abstract

A lighting system can comprise an array of domed light emitting diodes covering a surface area of a substrate and two optics for processing emitted light. The first optic can comprise an inner surface facing the array and an exterior surface facing away from the array. The second optic can comprise grooves extending away from the array. The inner surface of the first optic can form a cavity that is large relative to the array. For example, the cavity can have a volume exceeding the volume of a cube, where each side of the cube has the surface area of the array.

## Claims

### Claim 1

A lighting fixture comprising:
a housing comprising an opening configured to face an area to be illuminated;
a first optic attached to the housing and comprising an interior surface defining a cavity and an exterior surface oriented to face the area to be illuminated;
a two-dimensional array of light emitting diodes mounted adjacent or in the cavity and oriented to emit light into the cavity; and
a second optic comprising:
a first end circumscribing the first optic;
a second end opposite the first end; and
refractive grooves extending between the first end and the second end.

### Claim 2 (depends on 1)

The lighting fixture of claim 1, wherein the second optic further comprises:
an interior surface facing the first optic and comprising the refractive grooves; and
an exterior surface that is substantially smooth opposite the interior surface.

### Claim 3 (depends on 1)

The lighting fixture of claim 1, wherein the second end of the second optic is open, so that light emitted from the first optic includes first rays that are incident on the second optic and second rays that are oriented to illuminate the area while missing the second optic.

### Claim 4 (depends on 1)

The lighting fixture of claim 1, wherein the interior surface of the first optic is rotationally symmetric and comprises:
a flared peripheral region;
a bowl-shaped region; and
a substantially flat sidewall disposed between the flared peripheral region and the bowl-shaped region.

### Claim 5 (depends on 1)

The lighting fixture of claim 1, wherein the interior surface comprises a sidewall and a bowl-shaped region that meet in a corner.

### Claim 6 (depends on 1)

The lighting fixture of claim 1, wherein the interior surface of the first lens has a cross sectional profile comprising an abrupt change in direction disposed between a sidewall and a bottom surface region.

### Claim 7

A lighting system, for providing illumination along an axis, comprising:
a housing comprising an aperture through which the axis passes;
a substrate mounted at a position adjacent to or in the aperture;
an array of light emitting diodes mounted to the substrate and organized about the axis to emit light along the axis, the array of light emitting diodes comprising an array of domes;
a first optic comprising:
an interior surface forming a cavity; and
an exterior surface opposite the interior surface, wherein the first optic is mounted adjacent the array of light emitting diodes with the axis passing through the first optic, wherein at least portions of the domes are disposed in the cavity; and
a second optic comprising:
a first end oriented towards the housing and comprising a first aperture;
a second end comprising a second aperture; and
a pattern of grooves extending between the first aperture and the second aperture, wherein the axis passes through the first aperture and the second aperture.

### Claim 8 (depends on 7)

The lighting system of claim 7, wherein the interior surface of the first optic and the exterior surface of the first optic are rotationally symmetrical about the axis.

### Claim 9 (depends on 7)

The lighting system of claim 7, wherein the second optic is rotationally symmetrical about the axis.

### Claim 10 (depends on 7)

The lighting system of claim 7, wherein, the first optic has a profile defined by a cross section of the first optic taken in a plane that incorporates the axis, the profile comprising a substantially linear region that meets with a curved region to form a corner.

### Claim 11 (depends on 7)

The lighting system of claim 7, wherein the interior surface comprises:
a slanted region disposed peripherally with respect to the array of light emitting diodes;
a sidewall region disposed about the axis; and
a bowl-shaped region through which the axis passes.

### Claim 12 (depends on 7)

The lighting system of claim 7, wherein the array of light emitting diodes extends a first distance across the substrate, and
wherein, in cross section, the cavity is sized to accommodate a square having sides of length equal to the first distance.

### Claim 13

A lighting system comprising:
a housing;
a planar substrate disposed in the housing;
an array of domed light emitting diodes attached to the planar substrate to cover an area of the planar substrate;
an optic comprising an interior refractive surface oriented for receiving light from the array of domed light emitting diodes and an exterior refractive surface oriented for emitting the received light,
wherein the interior refractive surface forms a cavity into which the array of domed light emitting diodes projects, and
wherein the cavity has a volume that is greater than a cube having sides of surface area equal to the covered area of the planar substrate.

### Claim 14 (depends on 13)

The lighting system of claim 13, wherein the cavity is large enough so that the cube could fit in the cavity.

### Claim 15 (depends on 14)

The lighting system of claim 14, wherein the interior surface comprises:
a sidewall, that is substantially flat in cross section, circumscribing an axis of the lighting system; and
a bowl-shaped region through which the axis passes.

### Claim 16 (depends on 15)

The lighting system of claim 15, wherein the bowl-shaped region and the substantially flat sidewall meet in a corner.

### Claim 17 (depends on 16)

The lighting system of claim 16, wherein the corner is rounded, and
wherein the interior surface further comprises a flared peripheral region.

### Claim 18 (depends on 13)

The lighting system of claim 13, wherein the lighting system further comprises:
an optical axis, and
a second optic comprising grooves extending along the optical axis.

### Claim 19 (depends on 13)

The lighting system of claim 13, wherein the cavity comprises a rounded corner disposed to receive light from the array.

### Claim 20 (depends on 13)

The lighting system of claim 13, wherein the array of domed light emitting diodes comprises at least seven light emitting diodes, each having a respective dome.