LED Light Fixture With Background Lighting

• US 20130093360A1
• Filed: 11/14/2012
• Published: 04/18/2013
• Est. Priority Date: 04/23/2010
• Status: Active Grant

• Current Assignee: Harman Professional Denmark ApS. (Samsung Electronics Co. Ltd.)
• Original Assignee: Martin Professional A/S (Samsung Electronics Co. Ltd.)
• Inventors: Vinther, Thomas, Hansen, Claus
• Granted Patent: US 9,781,779 B2
• Time in Patent Office: Days
• US Class Current: 315/312
• 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 arranged in at least a first group of light sources and in a second group of light sources, where said first group of light sources said second group of light sources are individually controllable;

a number of light collecting means, said number of light collecting means collect light from said first group of light sources and convert said collected light into a number of source light beams;

said number of light sources and number of light collecting means are arranged in a housing from which said light sources beams emitted;

said housing comprises a diffuser cover comprising;

at least one diffuser region, said diffuser region receives light generated by said second group of light sources and diffuses said received light; and

at least one non-diffusing region where through at least at part of said number of source light beams pass without being diffused.

2. An illumination device according to claim 1 wherein at least one of said diffuser regions is arranged between at least two non-diffusing regions.

3. An illumination device according to claim 1 wherein at least one of said light sources of said second group is arranged between at least two of said light sources of said of said first group.

4. An illumination device according to claim 1 wherein said illumination device comprises controlling means adapted to individually control said first group of light sources and said second group of light sources.

5. An illumination device according to claim 4 wherein said controlling means is adapted to control said first group of light sources based on an input signal indicative of a first target color.

6. An illumination device according to claim 5 wherein said controlling means are adapted to control said second group of light sources based on said first target color.

7. An illumination device according to claim 4 wherein said controlling means are adapted to control said second group of light sources based on said input signal indicative of a second target color.

8. An illumination device according to claim 1 wherein at least a part of said diffuser cover protrudes from said housing.

9. An illumination device according to claim 1 wherein at least one non-diffusing region is a clear area arranged above said light collecting means.

10. An illumination device according to claims 1 wherein at least one non-diffusing region is an aperture arranged above said light collecting means.

11. An illumination device according to claim 1 further comprising a zoom lens, said zoom lens is movable in relation to said light collecting means and is adapted to change the diverges of at least one of said light source beams.

12. A moving head light fixture comprising:

a base

a yoke connected rotatable to said base,

a head connected to rotatable said yoke

wherein said head comprises

an illumination device comprising;

a number of light sources arranged in at least a first group of light sources and in a second group of light sources, where said first group of light sources said second group of light sources are individually controllable;

a number of light collecting means, said number of light collecting means collect light from said first group of light sources and convert said collected light into a number of source light beams;

said number of light sources and number of light collecting means are arranged in a housing from which said light sources beams emitted;

said housing comprises a diffuser cover comprising;

at least one diffuser region, said diffuser region receives light generated by said second group of light sources and diffuses said received light; and

at least one non-diffusing region where through at least at part of said number of source light beams pass without being diffused.

13. A method of controlling an illumination device comprising the steps of:

arranging a number of light sources in at least a first group of light sources and in a second group of light sources;

creating a number of light source beams by adapting a number of light collecting means to collect light from said first group of light sources and to convert said collected light into said number of source light beams;

illuminating an area between at least two of said light source beams by providing diffusing means between at least two of said light source beams and by adapting said diffusing means to receive light generated by said second group of light sources and diffuses said received light.

14. An method according to claim 13 wherein said method comprises the steps of:

controlling said first group of light sources based on a first target color;

controlling said second group of light sources on a second target color.

15. An method according to claim 14 wherein said method comprises the steps of:

determining said second target color based on said first target color.