Homogenization system for an LED luminaire

• US 10,133,080 B2
• Filed: 11/27/2017
• Issued: 11/20/2018
• Est. Priority Date: 01/14/2013
• Status: Active Grant

• Current Assignee: Robe Lighting S.R.O.
• Original Assignee: Robe Lighting S.R.O.
• Inventors: Jurik, Pavel, Valchar, Josef
• Primary Examiner(s): Bowman, Mary Ellen
• Application Number:
  US15/823,215
• Publication Number:
  US 20180081185A1
• Time in Patent Office: 358 Days
• CPC Class Codes: F21V 21/30 Pivoted housings or frames
• CPC Class Codes: F21V 9/08 for producing coloured light, e.g. monochromatic; for reducing intensity of light with provision for controlling the colour F21V9/40
• CPC Class Codes: F21W 2131/40 Lighting for industrial, commercial, recreational or military use
• CPC Class Codes: F21W 2131/406 for theatres, stages or film studios
• CPC Class Codes: F21Y 2105/12 characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities
• CPC Class Codes: F21Y 2105/18 annular; polygonal other than square or rectangular, e.g. for spotlights or for generating an axially symmetrical light beam
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 27/141 using dichroic mirrors

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

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 beam of light,

wherein the light source comprises;

a first array of light emitting diodes (LEDs), the first array comprising a first plurality of sets of LEDs, each set of the first plurality of sets of LEDs having a different associated peak wavelength;

a second array of LEDs, the second array comprising a second plurality of sets of LEDs, each set of the second plurality of sets of LEDs having a different associated peak wavelength; and

a dichroic filter configured to combine light from the first array of LEDs with light from the second array of LEDs to produce the emitted beam of light, wherein filter characteristics of the dichroic filter are selected to maximize transmission of the light from the first plurality of sets of LEDs and to maximize reflection of the light from the second plurality of sets of LEDs.

2. The luminaire of claim 1, wherein the dichroic filter is a first dichroic filter and the light source further comprises:

a third array of light emitting diodes (LEDs), the third array comprising a third plurality of sets of LEDs, each set of the third plurality of sets of LEDs having an associated peak wavelength; and

a second dichroic filter configured to combine light from the first dichroic filter with light from the third array of LEDs to produce the emitted beam of light, wherein filter characteristics of the second dichroic filter are selected to maximize transmission of the light from the first and second pluralities of sets of LEDs and to maximize reflection of the light from the third plurality of sets of LEDs.

3. The luminaire of claim 2, wherein the first plurality of sets of LEDs comprises first and second sets of LEDs and the LEDs of the first set of LEDs are physically interspersed with the LEDs of the second set of LEDs.

4. The luminaire of claim 2, further comprising a controller electronically coupled to the first, second, and third pluralities of sets of LEDs and configured to individually control a brightness of at least one set of LEDs.

5. The luminaire of claim 2, further comprising first, second, and third collimating optical systems each optically coupled with an associated one of the first, second, and third pluralities of sets of LEDs, wherein each collimating optical system is configured to collimate the light from the LEDs of its associated plurality of sets of LEDs.

6. The luminaire of claim 2, 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, wherein the second axis is orthogonal to the first axis.

7. The luminaire of claim 2, 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.

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

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

10. 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.

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 beam of light,

wherein the light source comprises;

a first array of light emitting diodes (LEDs), the first array comprising a first plurality of sets of LEDs, each set of the first plurality of sets of LEDs producing light of a differing color;

a second array of LEDs, the second array comprising a second plurality of sets of LEDs, each set of the second plurality of sets of LEDs producing light of a differing color;

a third array of light emitting diodes (LEDs), the third array comprising a third plurality of sets of LEDs, each set of the third plurality of sets of LEDs producing light of a differing 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 dichroic filter are selected to maximize transmission of the light from the first and third pluralities of sets of LEDs and to maximize reflection of the light from the second plurality of sets 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 pluralities of sets of LEDs and to maximize reflection of the light from the third plurality of sets 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.

12. The luminaire of claim 11, wherein the first plurality of sets of LEDs comprises first and second sets of LEDs and the LEDs of the first set of LEDs are physically interspersed with the LEDs of the second set of LEDs.

13. The luminaire of claim 11, further comprising a controller electronically coupled to the first, second, and third pluralities of sets of LEDs and configured to individually control a brightness of at least one set of LEDs.

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

15. 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, wherein the second axis is orthogonal to the first axis.

16. 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.

17. 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.

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

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

20. 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.