# US 10,371,956 B2 · Homogenization system for an LED luminaire

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- Number: US 10,371,956 B2
- Document ID: US10371956B2
- Status: Granted
- Kind: B2
- Application number: 16/153,313
- Filed: 2018-10-05
- Published: 2019-05-23
- Granted: 2019-08-06
- Earliest claimed: 2013-01-14
- Assignees: Robe Lighting s.r.o.
- Applicants: Robe Lighting s.r.o.
- Inventors: Pavel Jurik; Josef Valchar
- Web page: https://patentgrep.com/patent/US10371956B2

## CPC

- G02B 27/141: {using dichroic mirrors}
- F21V 9/08: for producing coloured light, e.g. monochromatic; for reducing intensity of light (with provision for controlling the colour F21V9/40)
- F21V 21/30: Pivoted housings or frames
- F21W 2131/40: Lighting for industrial, commercial, recreational or military use
- F21W 2131/406: for theatres, stages or film studios
- F21Y 2105/12: characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities
- F21Y 2105/18: annular; polygonal other than square or rectangular, e.g. for spotlights or for generating an axially symmetrical light beam
- F21Y 2113/13: comprising an assembly of point-like light sources
- F21Y 2115/10: Light-emitting diodes [LED]
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21W: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- 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 remotely directable luminaire with an improved color LED homogenization system for LED luminaires employing a plurality of LED arrays where an array employs a plurality of discrete peak LED groups and dichroic mirrors maximized for transmission/reflection of around the groups of LED's discrete peaks to generate a directional homogenized color light beam with additive color mixing.

## Claims

### Claim 1

A luminaire comprising:
a head;
a positioning mechanism, coupled to the head and configured to rotate the head in at least one axis; and
a light source, coupled to the head and configured to emit a light beam, the light source comprising:
a first array of light emitting diodes (LEDs), comprising first and second sets of LEDs, the first and second sets of LEDs producing light of first and second colors, respectively;
a second array of LEDs, comprising third and fourth sets of LEDs, the third and fourth sets of LEDs producing light of third and fourth colors, respectively;
a third array of LEDs, comprising a fifth set of LEDs producing light of a fifth color;
a first dichroic filter, configured to combine light from the first array of LEDs with light from the second array of LEDs, wherein filter characteristics of the first dichroic filter are selected to maximize transmission of the light from the first and the third arrays of LEDs and to maximize reflection of the light from the second array of LEDs; and
a second dichroic filter, configured to combine light from the first array of LEDs with light from the third array of LEDs, wherein filter characteristics of the second dichroic filter are selected to maximize transmission of the light from the first and second arrays of LEDs and to maximize reflection of the light from the third array of LEDs,
wherein the light beam emitted by the light source comprises the light combined by the first dichroic filter and the light combined by the second dichroic filter.

### Claim 2 (depends on 1)

The luminaire of claim 1, wherein LEDs of the first and second sets of LEDs are physically interspersed in the first array of LEDs or LEDs of the third and fourth sets of LEDs are physically interspersed in the second array of LEDs.

### Claim 3 (depends on 1)

The luminaire of claim 1, further comprising a controller electronically coupled to the first through fifth sets of LEDs and configured to individually control a brightness of at least one of the first through fifth sets of LEDs.

### Claim 4 (depends on 1)

The luminaire of claim 1, further comprising first, second, and third collimating optical systems each optically coupled with an associated one of the first, second, and third arrays of LEDs, wherein each collimating optical system is configured to collimate the light from the LEDs of the associated array of LEDs.

### Claim 5 (depends on 1)

The luminaire of claim 1, wherein the at least one axis is a first axis and the positioning mechanism is further configured to rotate the head in a second axis, the second axis being orthogonal to the first axis.

### Claim 6 (depends on 1)

The luminaire of claim 1, further comprising a cooling system thermally coupled to the light source and configured to remove heat generated by the light source.

### Claim 7 (depends on 1)

The luminaire of claim 1, further comprising a focusing optical system optically coupled to the light source, wherein the focusing optical system is configured to focus to a focal point the light beam emitted by the light source.

### Claim 8 (depends on 7)

The luminaire of claim 7, wherein the focusing optical system is further configured to homogenize the light beam emitted by the light source.

### Claim 9 (depends on 7)

The luminaire of claim 7, wherein the focusing optical system comprises moveable elements configured to adjust a focal length of the focusing optical system.

### Claim 10 (depends on 7)

The luminaire of claim 7, wherein the luminaire further comprises an optical device system optically coupled to the light source, the optical device system comprising one or more of a field stop, an aperture, a gate, a rotating gobo wheel, a stationary gobo wheel, an animation wheel, a lens system, a selectable rotating prism system, and a selectable frost system.

### Claim 11

A luminaire comprising:
a head;
a positioning mechanism, coupled to the head and configured to rotate the head in at least one axis; and
a light source, coupled to the head and configured to emit a light beam, the light source comprising:
a first array of light emitting diodes (LEDs), comprising first and second sets of LEDs, the first and second sets of LEDs producing light of first and second colors, respectively;
a second array of LEDs, comprising a third set of LEDs producing light of a third color;
a third array of LEDs, comprising a fourth set of LEDs producing light of a fourth color;
a first dichroic filter, configured to combine light from the first array of LEDs with light from the second array of LEDs, wherein filter characteristics of the first dichroic filter are selected to maximize transmission of the light from the first and the third arrays of LEDs and to maximize reflection of the light from the second array of LEDs; and
a second dichroic filter, configured to combine light from the first array of LEDs with light from the third array of LEDs, wherein filter characteristics of the second dichroic filter are selected to maximize transmission of the light from the first and second arrays of LEDs and to maximize reflection of the light from the third array of LEDs,
wherein the light beam emitted by the light source comprises the light combined by the first dichroic filter and the light combined by the second dichroic filter.

### Claim 12 (depends on 11)

The luminaire of claim 11, wherein LEDs of the first and second sets of LEDs are physically interspersed in the first array of LEDs.

### Claim 13 (depends on 11)

The luminaire of claim 11, further comprising a controller electronically coupled to the first through fourth sets of LEDs and configured to individually control a brightness of at least one of the first through fourth sets of LEDs.

### Claim 14 (depends on 11)

The luminaire of claim 11, further comprising first, second, and third collimating optical systems each optically coupled with an associated one of the first through third arrays of LEDs, wherein each collimating optical system is configured to collimate the light from the LEDs of the associated array of LEDs.

### Claim 15 (depends on 11)

The luminaire of claim 11, wherein the at least one axis is a first axis and the positioning mechanism is further configured to rotate the head in a second axis, the second axis being orthogonal to the first axis.

### Claim 16 (depends on 11)

The luminaire of claim 11, further comprising a cooling system thermally coupled to the light source and configured to remove heat generated by the light source.

### Claim 17 (depends on 11)

The luminaire of claim 11, further comprising a focusing optical system optically coupled to the light source, wherein the focusing optical system is configured to focus to a focal point the light beam emitted by the light source.

### Claim 18 (depends on 17)

The luminaire of claim 17, wherein the focusing optical system is further configured to homogenize the light beam emitted by the light source.

### Claim 19 (depends on 17)

The luminaire of claim 17, wherein the focusing optical system comprises moveable elements configured to adjust a focal length of the focusing optical system.

### Claim 20 (depends on 17)

The luminaire of claim 17, wherein the luminaire further comprises an optical device system optically coupled to the light source, the optical device system comprising one or more of a field stop, an aperture, a gate, a rotating gobo wheel, a stationary gobo wheel, an animation wheel, a lens system, a selectable rotating prism system, and a selectable frost system.