LED LIGHT PROJECTOR WITH A SINGLE REFLECTED BEAM

• US 20110235323A1
• Filed: 10/08/2010
• Published: 09/29/2011
• Est. Priority Date: 03/23/2010
• Status: Active Grant

• Current Assignee: Coemar S.p.A.
• Original Assignee: Coemar S.p.A.
• Inventors: ALLEGRI, FABIO
• Granted Patent: US 8,393,753 B2
• Time in Patent Office: Days
• US Class Current: 362/232
• CPC Class Codes: F21K 9/62 using mixing chambers, e.g. housings with reflective walls
• CPC Class Codes: F21V 13/04 the elements being reflectors and refractors for vehicle rear lights F21S43/40
• CPC Class Codes: F21V 14/02 by movement of light sources in vehicle head lamps F21S41/657
• CPC Class Codes: F21V 19/02 with provision for adjustment, e.g. for focusing
• CPC Class Codes: F21V 31/04 Provision of filling media
• CPC Class Codes: F21V 5/002 using microoptical elements for redirecting or diffusing light
• 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 7/0008 providing for indirect lighting
• CPC Class Codes: F21V 7/22 characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
• CPC Class Codes: F21W 2131/406 for theatres, stages or film studios
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/60 Reflective elements

Abstract

A LED light projector (1), comprising:

• a plurality of LED light sources (3) capable of emitting a corresponding number of light beams (4);
• a box-like body (7) housing within it the light sources (3) and having interior walls (7a) painted white to mix the light beams (4) in such a way as to emit a single output beam (14);
• a frosted optical lens (8) located opposite the light sources (3);
• at least one reflecting surface (2) set at a variable pre-established distance (d) from the optical element (8) so that the single beam (14) strikes the reflecting surface (2), giving rise by reflection to a homogeneous light cone (6).

Claims

1. A LED light projector, characterised in that it comprises:

a plurality of LED light sources capable of emitting a corresponding number of light beams;

means for mixing the light beams originating from the LED light sources in such a way as to obtain a single beam, said means comprising an optical element located opposite said light sources;

at least one reflecting surface set at a pre-established distance from said optical element so that said single beam strikes the reflecting surface, giving rise by reflection to a homogeneous light cone, said pre-established distance being variable so as to modify the aperture of said light cone.

2. Projector according to claim 1, further comprising a box-like body housing within it said light sources, said box-like body having interior walls painted white which form part of the means for mixing the light beams issued by the sources.

3. Projector according to claim 2, wherein said interior walls are coated with compounds based on calcium carbonate in order to achieve a high diffusion power.

4. Projector according to claim 2, wherein said interior walls are coated with compounds based on magnesium carbonate in order to achieve a high diffusion power.

5. Projector according to claim 2, wherein said box-like body substantially has the shape of a cylinder having a first base, where said LED light sources are housed and a second base, located opposite the reflecting surface, where said optical element is disposed, said interior walls coinciding with the interior lateral surface of said cylinder.

6. Projector according to claim 2, wherein said box-like body has:

a first base, where said LED light sources are housed;

a second base, located opposite the reflecting surface, where said optical element is disposed;

interior walls that are outwardly rounded so as to favour the convergence of the light beams issued by the sources toward the optical element.

7. Projector according to claim 5, wherein the light sources are regularly disposed on said first base in such a way as to form a circular light support having a diameter smaller than or equal to the height of said box-like body.

8. Projector according to claim 2, wherein said box-like body is provided with a slide designed to slide on a guide extending substantially parallel to the main optical axis of said reflecting surface, said slide and said guide forming means for varying said pre-established distance.

9. Projector according to claim 1, further comprising a layer of resin applied as covering for said LED light sources.

10. Projector according to claim 9, further comprising a plurality of lenses immersed in said layer of resin, each of said lenses being operatively active upon a corresponding LED light source so as to influence the light beam emitted.

11. Projector according to claim 1, wherein said optical element is a frosted optical lens.

12. Projector according to claim 1, wherein said reflecting surface is parabolic or spherical.