Abstract:
An electronic luminaire based on light emitting diodes, for illumination with a low electric power consumption at indoor spaces for offices or wide spaces, which use false soffit systems on their ceilings, in order to adapt their lighting. It is based on a closed module that is manufactured with hot galvanized stamped laminated steel or with injection molding plastic, and comprehends four sections: A), B), C) and D), where A) corresponds to a casing which houses B) and C) overlapped sections, and these are finally assembled to D) section, together with an electronic power source; the B) section is an electrical harness, the C) section is a plurality of LED bars, and D) section corresponds to the reflecting screen, that counts with a plurality of individual reflecting elements of concave, elliptical or parabolic type.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     Electronic luminaries based on light emitting diodes (LEDs) with a power source which operates with alternating current and provides regulated direct current; they have a special design based on a dust protected and an enclosed four-section compact body that includes: an electric harness, multiple or individual bars with heat dissipation elements, plurality of LEDs and a reflecting multi-optics screen. The present LED luminaire has the characteristic of low power consumption, and is intended for indoor illumination in offices, laboratories, hallways, stairs and other wide open spaces like covered parking garages that preferably have grid ceiling systems in order to adapt an illumination system. 
     2. Description of the State of the Art 
     Different designs already exist with a luminosity provided by light emitting diodes (LEDs), for example in the U.S. Pat. No. 6,428,189 B1 there is a description of a lamp assembly which is electrically operated through light emitting diodes (LEDs) and comprehends a heat sink made of a metallic material arranged in series or in parallel connection related to a circuit panel. Its main characteristic is that it has spaces through and around which there is a plurality of LEDs; it also comprehends an integral heat sink belt in each LED that is placed in thermal contact with the heat sink in order to conduct the heat away from the LEDs on to the heat sink. 
     In the Mexican patent application MX/a/2007/011521, filed in by this same Petitioner, there is a lamp description with a technology based on light emitting diodes (LEDs) and provides lighting for indoor applications in an efficient and economical way, with a longer life span than conventional technologies, which represents up to 5 times more in useful life, with a low energy consumption. These are ideal for use in places where a continuous operation is required. Each lamp has a power consumption of 48 watts, and each one is distinguished by a metallic aluminum plate or substrate, the main function of which is to transport the heat away from the LEDs and also to support the lamp structure; the substrate has a plurality of holes in which the elements for the light emitting diodes are placed on the top side of the substrate. The assembly is protected by a PET polymer diffuser. 
     The luminaire that constitutes the present invention is based on LEDs with high luminous flux output, and has an optimized distribution for indoor applications, with the characteristic of low power consumption. The luminaire is composed by a base or main casing preferably manufactured by injection molding of plastic, together with metallic elements for heat dissipation in multiple bars or in individual elements for each (LED). 
     The casing is a sole body unit, and it can be manufactured by sheet metal stamping of laminated steel, galvanized type, or laminated aluminum. 
    
    
     
       DESCRIPTION OF THE INVENTION 
       The following section describes the invention according to the drawings in the  FIGS. 1 to 7 , where: 
         FIG. 1  Corresponds to an exploded isometric view of the luminaire, with its A, B, C and D sections showing LED bars and multiple heat sinks. 
         FIG. 2  Corresponds to a side view of the A section in the luminaire from  FIG. 1 , showing an a) detail of the screen. 
         FIG. 3  Corresponds to an exploded view of the sections A, B, C, and D of the luminaire with LEDs and individual heat sinks. 
         FIG. 4  Corresponds to a sectioned side view of the luminaire shown in  FIG. 3 , with the detail (b) of the screen. 
         FIG. 5  Corresponds to several views of the luminaire for different installation methods, where (A 1 ) and (B 2 ) views correspond to suspended fastening, (C 3 ) for centered hanging fastening using conduit tube and (D 4 ) for fastening with a centered joint for various positions. 
         FIG. 6  Corresponds to different views of  FIG. 5 , where (F 6 ) is for suspended fastening, (G 7 ) for centered suspended fastening, (H 8 ) for fastening by centered articulation in several positions, and (E 5 ) for recessed installation in grid-type ceiling systems. 
         FIG. 7  Corresponds to a view from the lower external base of the luminaire with different reflecting screens: (J 9 ), (K 10 ), (L 11 ) and (M 12 ) for diverse LEDs and dimension configurations. 
     
    
    
     The invention is related to a luminaire  10   FIG. 1  to  FIG. 4 , based on a square or rectangular module, or other design, consisting of a single compact and closed unit, distinguished by a module which is comprised by four sections: (A), (B), (C) and (D); these are coupled and assembled together, where (B) and (C) sections are placed within (A), and (D) is assembled over the (A) section in the luminaire module, with such a module being formed by the following elements: a casing device, which corresponds to the (A) section, preferably made of injection molded plastic; it can also be manufactured by stamping and bending processes, of sheet metal such as galvanized rolled steel or rolled aluminum, with a plurality of vents:  11   FIG. 1 , arranged on its side faces or on the top cover, if required; it also has an exit with a plastic ring:  12 , or a tubular ring:  12   a ,  FIG. 5  (C 3 ), with an electrical connector wired to the center or to the side of the top cover, for external electrical connections:  21 , to the general power feeding line for the plurality of luminaries, which also acts as an input to the power supply:  13 , for direct current feeding to the plurality of LEDs; next, the (B) section of the electric harness:  14 , is placed inside the casing; such harness allows to manipulate the assembly and LEDs connections; the harness has a male electrical connecting element:  15 , which is wired to the (+) (−) poles on the power supply  13 ; then the overlapped (C) section—formed by a plurality of at least two or more double-faced PCB or MCPCB type bars:  16 , and a printed circuit board with a metal core; such bars are equidistantly placed between in a parallel position inside the (A) section of the module. These bars:  16 , are integrated by a printed circuit board:  17 , and a heat dissipating metal element:  18  made of aluminum, detail (a),  FIG. 1 ,  FIG. 2 , and overlapped one against the other; they have holes:  19 , on each of the bar ends for its fastening to module:  10  of the casing—(A) section. The MCPCB bar is printed circuit board assembly, which is built with two overlapping copper layers, separated by a dielectric isolator, or only one copper layer with dielectric isolator, and a final metal layer—typically aluminum—; such card is fastened to the heat dissipating element with a special high thermal conductivity adhesive. The configuration of the double sided PCB bar is similar to the MCPCB bar, except for the absence of the external metal layer. For both types of electronic cards there is a two-pole (+) (−) female connector:  22 ,  FIG. 2 , which is connected to the harness:  14 , by multiple two-pole male connectors  15   a . The multiple LEDs:  20 ,  FIG. 1 , are distributed equidistantly to each other along the bars, and their amount varies according to the dimensions of the available surface area on the selected modules over the casing; the number of LEDs can vary from 1 to 25 or more, depending on the user&#39;s lighting needs; in this ceiling systems with standard dimensions such as: 60×60 cm, 30×60 cm, 30×120 cm, or 60×120 cm. The LEDs:  20 , also have protecting elements to shelter them from dust, insects and moisture; such guards;  23 , are concave or semispherical type, allowing the separation of the (D) section without damaging the LED. Next, section (D) corresponds to the reflecting screen:  24 . This section has the same geometrical perimeter as the casing does, and it is assembled to the casing by hand pressure or using metal pieces (with screws); it can contain multiple reflectors:  25 , with parabolic or elliptical type, or any other concave geometry which benefits light distribution; in this case, there is a series from 10 to 60:  FIG. 7 , placed equidistantly on each row, with a total from 10 to 40 or more reflecting screens; these are manufactured with ABS or PC plastic sheet, by processes like thermoforming or injection molding, with a surface finish deposit of high brightness chrome  27 ,  FIG. 2 , detail a), or by mechanical methods like stamping of high brightness aluminum. 
     On (D) section a flange  26  is shown on its perimeter, in order to simplify coupling to the casing. 
     The luminaire has an additional configuration, according to  FIG. 3 , (C′) section, where the LEDs  20 , are not placed on bar elements:  16 ,  FIG. 1  with multiple LEDs, but as individual LED sub-assemblies  20  (C′) section of  FIG. 3 . In this case, the original harness  14 ,  FIG. 1 , is modified, with the harness  14   a , of the (B′) section showing a plurality of connectors  15   a , corresponding to each LED  20 , while the original bars and heat sinks of  FIG. 1  are eliminated as multiple elements, and are adapted as individual heat sink elements  18   a , and electronic board  17   a    FIG. 3 . The rest of the components in  FIG. 1  included in the casing (A) section and reflecting screen  24  from section (D), do not change from their original design. 
     ADVANTAGES OF THE INVENTION 
     The luminaire which is described in this invention offers the following advantages, compared to the existing lighting systems for indoor environments, based on fluorescent tubes:
         It is a luminaire product with low power consumption.   It contributes with a minimum thermal load to a building&#39;s cooling system, because it operates at temperatures below 55° C.   It is a luminaire which requires a minimum maintenance and has a higher useful rated (50,000 hr.), compared to a fluorescent tube (1,200 hr. to 20,000 hr.).   Its power supply has automatic power factor correction, which is relevant in lighting installations where the negative contribution of the power factor, caused by the inductive charges from the luminaire ballasts for fluorescent tube, can provoke a penalty from the power supplier.   It is a compact and completely closed luminaire product, which reduces dust accumulation.   The cooling of the electronic components is achieved by natural convection.   It eliminates problems related with dazzling.   Its manufacturing method allows creating a wide range of shapes and sizes.   It combines an ultra-light weight with a good stiffness for its handling and installation.   The reflector&#39;s shape and surface finish contribute to the concentration of the light emitted by the LEDs.   It facilitates the interchangeability of the components for its maintenance after the installation.   It can be manufactured in an individual version or in multiple position arrangements.       

     There are three different types of installation positions of the luminaries, according to  FIG. 5  and  FIG. 6 . The (E 5 ) luminaire is shown with a classic recessed installation in a standard suspended grid ceiling 2×2 ft (60×60 cm)  15 , overlapping by hand pressure on the frames of the ceiling system. 
     The (A 1 ) and (B 2 ) luminaries demonstrate a suspended version with wire fastening  29  at four points  28   FIG. 5  (B 2 ). 
     The (C 3 ) luminaire shows a suspended version with centered fastening and a direct connection through a conduit tube. This version can be adapted for mounting on a wall, using a knee joint mechanism for an adjustable inclination. 
     There are different versions of the luminaire as shown in  FIG. 6 : (E 5 ) corresponds to a recessed on a suspended ceiling system version; while (F 6 ) for fastening by a centered hanging; (G 7 ) for fastening with conduit tube, and (H 8 ) for fixing by a centered knee joint with several positions. 
     On  FIG. 7  several luminaries are shown, which can be formed by 15, 30, 60 or more reflecting elements  25 ,  FIG. 1  (D), according to the user&#39;s illumination distribution and intensity requirements. See  FIG. 7 : (J 9 ), (K 10 ), (L 11 ) and (M 12 ). 
     Based on the previous description, the invention is considered a novelty, and therefore the following claims are made for its content.