LED light fixture with background lighting

• US 9,781,779 B2
• Filed: 11/14/2012
• Issued: 10/03/2017
• Est. Priority Date: 04/23/2010
• Status: Active Grant

• Current Assignee: Harman Professional Denmark ApS. (Samsung Electronics Co. Ltd.)
• Original Assignee: Martin Professional (Samsung Electronics Co. Ltd.)
• Inventors: Vinther, Thomas, Hansen, Claus
• Primary Examiner(s): Le, Don
• Application Number:
  US13/676,243
• Publication Number:
  US 20130093360A1
• Time in Patent Office: 1,784 Days
• CPC Class Codes: F21S 10/023 by selectively switching fixed light sources
• CPC Class Codes: F21V 21/30 Pivoted housings or frames
• CPC Class Codes: F21V 29/677 the fans being used for discharging
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 5/007 Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane combination of two or more refractors F21V5/008
• CPC Class Codes: F21V 7/0083 Array of reflectors for a cluster of light sources, e.g. arrangement of multiple light sources in one plane combination of two or more reflectors F21V7/0025
• CPC Class Codes: F21W 2131/406 for theatres, stages or film studios
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• 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 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2113/20 of different form
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 26/08 for controlling the direction of light in light guides G02B6/35
• CPC Class Codes: G02B 5/0278 used in transmission
• CPC Class Codes: H05B 45/00 Circuit arrangements for operating light-emitting diodes [LED]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/325 Pulse-width modulation [PWM]

Abstract

An illumination device with a number of light sources arranged in at least two groups of light sources that are individually controllable. The first group of light sources (203) have light collectors (209) such as internal reflection (TIR) lenses, mixers or other lenses placed over them to collect and convert light of the light sources into a number of light source beams. The second group of light sources (205) pass light through diffusing areas (215) of a diffuser (213) in the form of a diffusion cover included in the lamp housing to diffuse the light and create a background light for the first group of light sources. The light from the first group of light sources pass through non diffusing regions (211) of the diffuser cover without the light being diffused. The second group of light sources are interleaved with the first group by the diffuser having one or several diffusion areas between non diffusion areas. By controlling both groups of light sources based on the same target color the dotted look of led light sources can be removed or by controlling the two groups of light sources based on two different colors light effects can be obtained. The illumination device can be included in a moving head light source with a base, a yoke connected rotatably to the base and the head connected rotatably to the head.

Claims

1. An illumination device comprising a number of light sources and a number of light collecting means arranged in a housing, each of said light collecting means collecting and converting light from at least one of said light sources into a source light beam, whereby a number of source light beams are emitted from said housing, said housing comprising a diffuser cover, said diffuser cover comprising at least one diffuser region, said diffuser region receiving at least a part of said light generated by said light sources and diffusing the received light in many directions, and said diffuser cover further comprising a number of non-diffusing regions, wherein:

said number of source light beams equals said number of non-diffusing regions;

at least a part of each source light beam passes through a corresponding one of said non-diffusing regions as an outgoing light beam without being diffused in many directions; and

each of said non-diffusing regions is surrounded by at least part of said diffuser region.

2. The illumination device of claim 1, wherein at least a part of said diffuser cover protrudes from said housing.

3. The illumination device of claim 1, wherein at least one non-diffusing region is a clear area arranged above said light collecting means.

4. The illumination device of claim 1, wherein at least one non-diffusing region is an aperture arranged above said light collecting means.

5. The illumination device of claim 1, wherein said number of light sources are arranged in at least a first group of light sources and a second group of light sources, said number of light collecting means collecting and converting light from said first group of light sources into a number of source light beams, and said diffuser region receives light generated by said second group of light sources and diffuses said received light.

6. The illumination device of claim 5, wherein said first group of light sources and said second group of light sources are independently controlled.

7. A moving head light fixture comprising:

a base;

a yoke rotatably connected to said base; and

a head rotatably connected to said yoke;

wherein said head comprises a illumination device according to claim 1.

8. An illumination device comprising a plurality of RGBW LEDs and a plurality of light collectors arranged in a housing, each of said plurality of RGBW LEDs comprising a red die, a green die, a blue die and a white die, each of said plurality of light collectors collecting light from a corresponding one of the plurality of RGBW LEDs and each being adapted to mix said collected light into a light beam, whereby a plurality of light beams are emitted from said housing, said illumination device further comprising a diffuser cover, said diffuser cover comprising at least one diffuser region diffusing received light in many directions, said diffuser cover further comprising a number of non-diffusing regions, wherein:

said diffuser cover is formed as a zoom lens comprising a number of optical lenses, each of said optical lenses forming a non-diffusing region and each being adapted to change a divergence of said plurality of light beams; and

an area between said optical lenses forms said at least one diffuser region.

9. The illumination device of claim 8, wherein said zoom lens is connected to at least one zoom motor configured to move said zoom lens back and forth in relation to said plurality of light collectors, whereby the divergence of said plurality of light beams can be changed.

10. The illumination device of claim 8, wherein each of said plurality of light collectors are arranged in a light collector holder adapted to position each of said plurality of light collectors above one of said plurality of RGBW LEDs.

11. The illumination device of claim 8, wherein a second group of light sources is arranged below said zoom lens, and wherein said received light comprises light generated by the second group of light sources, and wherein said at least one diffuser region receives said light generated by said second group of light sources and diffuses said received light in many directions.