FR2967234A3 - Light emitting device for e.g. signaling presence of skyscraper to airplane, has reflecting unit, and electronic unit comprising electronic card mounted in correspondence to access opening defined by end edge of reflecting unit - Google Patents

Abstract

The device (1) has a reflecting unit (3) attached to a support body (2). A set of LEDs (4', 4'') is fixed to the support body and positioned around the reflecting unit. An electronic unit (5) is connected to the LEDs by an electrical connection unit to control operation. The reflecting unit is provided with a set of end edges, where one of the end edges defines an access opening to an internal cavity. The electronic unit comprises an electronic card mounted in correspondence to the access opening.

Description

The present invention refers to a light emitting device.

The light emitting device in question is intended to be used advantageously to signal to air vehicles the presence of high structures such as chimneys, towers, skyscrapers, bridges, power line towers, etc. The light-emitting device in question is also advantageously usable for the illumination of interior environments, for example, houses, offices, cinemas, establishments, etc., and outdoor environments such as streets, squares, etc. , car parks, parks, gardens, etc. In more detail, the light emitting device in question is part of the industrial sector of the production of warning lights and luminaires equipped with 15 light sources of the LED type. STATE OF THE ART As is known, the use of light-emitting devices with LED-type light sources is diffuse because they have a greater luminous efficiency than most conventional light sources (such as For example, incandescent lamps, fluorescent lamps, discharge lamps). A known type of light-emitting device with LED-type light sources is, for example, the obstacle warning horn described in DE 20311169. This warning light comprises a horizontal support base on which is mounted a plurality of LEDs facing upwards and disposed around a substantially funnel-shaped central reflection body. This reflection body is provided with a reflection surface which develops above the LEDs and has an outwardly oriented concavity of the device for horizontally reflecting the light emitted vertically by the LEDs by generating a beam of light which is distributed 360 ° around the device. In addition, the aforementioned warning light has a heat sink, fixed under the LED support base and able to transfer the heat generated by the LEDs during operation to the outside environment. In more detail, the heat sink comprises a metal plate, fixed under the LED support base, from which a plurality of plate-shaped fins parallel to one another develop. The known type of light alarm described above further comprises an electronic unit for controlling the operation of the LEDs, arranged in a special slot formed inside the heat sink.

This warning light has proved, in practice, not without drawbacks. The main disadvantage of the light alarm described briefly above is related to the fact that the seat of the electronic unit is formed in the heat sink. This solution does not allow the heat sink to effectively eliminate heat, with a consequent increase in LED temperature that causes a decrease in efficiency and a significant reduction in the average life of these LEDs. A further disadvantage is due to the fact that the realization of the seat of the electronic unit in the heat sink involves a great complexity of construction of the device, resulting in high costs of design and construction.

US Patent 2010/0123397 discloses a subsequent known type of alarm comprising a support base on which is mounted a plurality of LEDs arranged around a central reflector. This alarm further comprises an electronic control unit connected to the LEDs and disposed in a seat formed on the support base and positioned under the central reflection body.

Even this last known type of alarm has the disadvantage of not effectively dissipating the heat generated by the LEDs through the support base because of the presence of the housing seat of the electronic control unit. A further disadvantage of the warning horn described in US 2010/0123397 is due to the fact that the predisposition of the electronics on the support base under the reflection body requires disassembly of the latter to access the electronic unit, in order to for example, to replace defective components, with the result of long delays either to disassemble the reflection body, or to reposition the reflection body in the correct position relative to the LEDs. In the area of environmental lighting lamps, there is also known an LED lamp, described in US patent 2010/0157592, which comprises a hollow confinement body inside which a plurality of positioned LEDs are mounted. around a central reflection body of frustoconical shape and having an enlarged base resting on the confinement body. An electronic control unit electrically connected to the LEDs and positioned outside the containment body is also provided. In more detail, the electronic control unit is housed in a seat formed on the outer surface of the confinement body arranged in correspondence of the enlarged base of the reflection body, and closed towards the outside of the lamp by a protective plate fixed on the same body of confinement. The main drawback of the lamp described in US 2010/0157592 is due to the fact that the predisposition of the electronic unit to the outside of the confinement body has a significant complexity of construction and, consequently, great difficulties in the process. assembly, in particular for making the electrical connections between the electronic unit and the LEDs. WO 2009/036198 discloses a light alarm comprising a containment body with a metal support base closed by a transparent cap. A hollow reflection body resting on the support base is disposed within the confinement body. A horizontal support plate is mounted at the top of the reflection body having four LEDs mounted and arranged around the reflection body and oriented towards the support base. The reflection body is equipped, under each LED, with a concave reflection surface oriented towards the outside of the alarm to reflect horizontally the light emitted vertically by the corresponding LED. The alarm further includes an electronic power unit mounted on the metal support base and enclosed within the reflection body, and electrically connected to the LEDs to provide electrical power thereto. The main disadvantage of the warning light described in patent WO 2009/036198 consists in the fact that the arrangement of the LEDs at the top of the reflection body does not effectively dissipate outside the horn the heat generated. by these same LEDs. As said before, this involves a consequent increase in the temperature of the LEDs which causes a drop in efficiency and a significant reduction in the average life of these same LEDs. A further disadvantage is due to the fact that access to the electronic unit, for example to replace defective components, necessarily requires also to disassemble the reflection body and the LEDs, with the result of long delays to perform the operations of interview. PRESENTATION OF THE INVENTION In this situation, the essential objective of the present invention is therefore to overcome the disadvantages presented by the known type of solutions, by providing a light emitting device that is able to effectively eliminate heat. generated by the LEDs. This object of the invention is solved by a light emitting device, which comprises: a support body; a reflection body which is attached to the support body, is provided with at least one internal cavity, and develops between its own first end edge, corresponding to which it is attached to the support body, and its own second edge spaced end of the support body; several LEDs fixed to the support body and positioned around the reflection body; at least one electronic unit connected to the LEDs by electrical connection means to control its operation. The light emitting device is characterized in that the second end edge of the reflection body defines an access opening to the internal cavity of the reflection body, and the electronic unit is positioned in correspondence of the opening of the reflection body. access defined by the second end edge of the reflection body. According to a further characteristic detail of the invention, the light emitting device is characterized in that the support body is provided with a first face, on which the LEDs and the reflection body are fixed, and a second face. substantially parallel to the first face and oriented in the opposite direction thereto; the light emitting device comprising heat dissipation means attached to the second face of the support body. According to a further characteristic detail of the invention, the light emitting device 25 is characterized in that the electrical connection means comprise a first printed circuit fixed on the support body, is provided with a third face fixed above the first face of the support body, and a fourth face on which the LEDs are mortified; at least one metal strip thermally coupled to the LEDs being provided on the fourth face of the first printed circuit.

A further object of the present invention is to provide a light emitting device of particularly compact dimensions. In accordance with this last objective and according to a particular characteristic of the invention, the light emitting device is characterized in that the electronic unit is housed at least partially in the internal cavity of the support body.

According to a further particular characteristic of the invention, the light emitting device is characterized in that the reflection body has a substantially frustoconical shape with the second end edge of larger dimensions than the first end edge. A further object of the present invention is to provide a light emitting device which allows maintenance and control operations to be carried out in a simple and rapid manner, and in particular which allows simple and fast access to the light. electronic LED unit. In accordance with this last objective and according to a particular characteristic of the invention, the light emitting device is characterized in that the electronic unit comprises at least one electronic card mounted in correspondence of the access opening defined by the second end edge of the reflection body. According to a further characteristic detail of the invention, the light emitting device is characterized in that the electronic board is fixed substantially bearing on the second end edge of the reflection body.

A further object of the present invention is to provide a light emitting device which is simple from the point of view of construction and economical to produce. According to this last objective and according to a particular characteristic of the invention, the light emitting device is characterized in that the reflection body is provided with at least one base wall fixed on the first end edge of the body. reflection ; the light emitting device comprising at least one power supply cable, which is connected to the electronic unit and enters the internal cavity of the reflection body through at least one opening formed on the base wall of the reflection body.

According to a further particular characteristic of the invention, the light-emitting device is characterized in that the electrical connection means comprise electrical connection cables, which pass through the internal cavity of the reflection body, and leave the internal cavity. reflection body through said at least one aperture.

According to a further particular characteristic of the invention, the light emitting device is characterized in that the power supply cable passes through a first channel formed in the support body and communicating with the internal cavity through the at least one opening formed on the base wall of the reflection body. According to a further particular characteristic of the invention, the light emitting device is characterized in that the electrical connection cables of the electrical connection means pass through a second channel, which is formed on a first face of the support body, on which LEDs are positioned, and is connected to the internal cavity of the reflection body by said at least one opening formed on the base wall of the reflection body.

According to a further particular characteristic of the invention, the light emitting device is characterized in that the electrical connection cables of the electrical connection means are intercepted by at least one electrical terminal housed in the internal cavity of the reflection body. According to a further particular characteristic of the invention, the light emitting device is characterized in that the electronic card is fixed to the reflection body by first fastening means, which comprise at least one tie rod connected between the support body and the electronic card for retaining the latter on the second end edge of the reflection body. BRIEF DESCRIPTION OF THE DRAWINGS The technical features of the invention, according to the above-mentioned objectives and the advantages thereof, will be more evident in the detailed description which follows, made with reference to the accompanying drawings, which represent two purely illustrative embodiments thereof and non-limiting in which: Figure 1 shows a side perspective view of the light emitting device object of the present invention in accordance with a first embodiment of the invention; Figure 2 shows a sectional view of the light emitting device illustrated in Figure 1 along the trace II - II of the same figure 1; Figure 3 shows a further sectional view of the light emitting device shown in Figure 1 along the trace III - III of the same figure 1; Figure 4 shows a schematic plan view of the light emitting device object of the present invention with some parts removed to better highlight others; Figure 5 shows a sectional view of the light emitting device object of the present invention in accordance with a second embodiment of the invention.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT With reference to the accompanying drawings, the light emitting device object of the present invention has been indicated as a whole by 1. In more detail, FIGS. 1-4 illustrate a first embodiment of the invention. light-emitting device 1 in question concerning a warning light intended to be advantageously mounted on tall buildings (such as, for example, skyscrapers, towers etc.) or on high structures (such as, for example, bridges , pylons, chimneys, etc.) to indicate the presence of overhead obstacles to vehicles such as airplanes and helicopters.

Fig. 5 illustrates a second embodiment of the light emitting device 1 in question concerning a lighting apparatus for use in illuminating indoor environments (such as houses, offices, cinemas, establishments, etc.), or environments outdoor areas (such as roads, squares, car parks, parks, gardens, etc.).

With reference to the two embodiments illustrated in the accompanying figures, the light emitting device 1 comprises a support body 2, which comprises a reflection body 3 fixed centrally. Several LEDs 4 ', 4 "are furthermore fixed on the support body 2 around the reflection body 3. In more detail, the reflection body 3 of the light emitting device 1 is provided with an internal cavity 7, and develops between its own first end edge 10, in correspondence of which it is attached to the support body 2, and its own second end edge 11 spaced from the support body 2. The light emitting device 1 further comprises an electronic unit 5, which is connected to the LEDs 4 ', 4 "by electrical connection means 6, and is able to control the operation of these same LEDs 4', 4", preferably in accordance with programmed operating modes. In accordance with the idea underlying the present invention, the second end edge 11 of the reflection body 3 defines an access opening 11 'to the internal cavity 7 of this same reflection body 3, and the electronic unit 5 is positioned in correspondence it of such an access opening 11 'defined by the second end edge 11. Advantageously, in accordance with the embodiments illustrated in the accompanying figures, the electronic unit 5 is housed at least partially in the internal cavity 7 of the reflection body 3, to realize the light emitting device 1 with particularly compact dimensions.

In accordance with the embodiments illustrated in the accompanying figures, the support body 2 of the light emitting device 1 is made of a metallic material, preferably aluminum, by a pressure casting process, and comprises a shaped part plate 60, preferably disk-shaped, having a first face 8, on which the reflection body 3 and the LEDs 4 ', 4 "are positioned, and a second face 9 parallel to the first 8 and the reflective body 3 has a substantially frustoconical shape, and develops between its own first end edge 10, corresponding to which it is attached to the first face 8 of the part. in the form of a plate 60 of the support body 2, and its own second end edge 11 of larger dimensions than the first end edge 10. In more detail, the reflection body 3 is provided with a lateral wall ale 13 which extends between the first and the second end edge 10, 11 of the same reflection body 3, and preferably develops around a central axis X orthogonal to the first face 8 of the shaped part In addition, the reflection body 3 is preferably provided with a base wall 12 fixed on its first end edge 10 and preferably made of a single body with the side wall. 13. The base wall 12 and the side wall 13 of the reflection body 3 delimit the internal cavity 7 of the latter, in which is housed the electronic unit 5 which controls the operation of the LEDs 4 ', 4 ". Advantageously, the lateral wall 13 of the reflection body 3 is provided with an external surface 14 which develops around the central axis X with a generative section of concave shape, in particular parabolic, and extends in front of the LEDs. 4 ', 10 4 "for the interception of the first light rays emitted by the latter, as described in detail in the following: Preferably, the generative section of the external surface 14 of the reflection body 3 has a linear development in sections which approximates the shape of a conic, in particular a parabola In accordance with the embodiments illustrated in the accompanying figures, the LEDs 4 ', 4 "are preferably positioned around the reflection body 3 substantially. along a common positioning line, preferably of circular shape with the central axis X as the center. In particular, the positioning line of the LEDs 4 ', 4 "coincides with the line of fire of the surface. this external 14 of the reflection body 3. In more detail, each LED 4 ', 4 "is provided with its own Y light emission axis, which is substantially parallel to the central axis X and intersects the outer surface 14 of the reflection body 3. Functionally, each LED 4 ', 4 "emits the first beams of light rays, in particular with a light emission cone of about 120 °, on the outer surface 14 of the body reflection 3, which reflects them with second beams of light rays propagating mainly along directions of propagation of light Z orthogonal to the central axis X. In accordance with the embodiments illustrated in the accompanying figures, the LEDs 4 ', 4 "comprise first 4' LEDs (four, for example) connected together in series, and second 4" LEDs (four, for example) connected together in series, with the first LEDs 4 'positioned in alternation to the second LEDs 4 "along their positioning line around the reflection body 3. Advantageously, the electrical connection means 6, which connect the electronic unit 5 to the LEDs 4 ', 4 ", comprise a power supply circuit 15 of the LEDs 4', 4 provided on the first face 8 of the plate-shaped portion 60 of the support body 2, and comprise electrical connection cables 33 which connect the supply circuit 15 to the electronic unit 5. Preferably, the circuit power supply 15 consists of a first printed circuit 20, on which are made metal tracks 18, 19 able to connect the LEDs 4 ', 4 "to the electric connection cables 33 coming from the electronic unit 5.

In more detail, the first printed circuit 20 is provided with a third face 16 fixed above the first face 8 by the plate-shaped portion 60 of the support body 2, and a fourth face 17 on which the 4 ', 4 "LEDs are mounted and on which the aforementioned metal tracks 18, 19 are made, In particular, with reference to the embodiment illustrated in FIG. 4, on the fourth face 17 of the first printed circuit 20 is provided a first metal track 18 which connects in series the first LEDs 4 'and develops in a ring around the central axis X near the peripheral contour 21 of the first printed circuit 20 between a pair of first terminals 22', 22 "(a positive and a negative). In addition, a second metal track 19 is provided which connects the second LEDs 4 "in series and develops in a ring around the central axis X between a pair of second terminals 23 ', 23" (a positive and a negative). In particular, the second metal track 19 is disposed within a first area of the fourth face 17 of the first printed circuit 20 delimited by the first metal track 18. Preferably, the first printed circuit 20 is of the IMS type (FIG. Insulated Metal Substrates - insulated metal substrates) and comprises a first support layer of metal material, in particular aluminum, provided on the first face 8 of the plate-shaped portion 60 of the support body 2, a second intermediate layer of material dielectric and thermally conductive (especially epoxy resin) provided above the first layer, and a third copper layer on which the metal tracks 18, 19 are made and placed above the second intermediate layer. Advantageously, on the fourth face 17 of the first printed circuit 20, on which the LEDs 4 ', 4 "are mounted, at least one metal strip 24, 25 thermally coupled to the LEDs 4', 4" is provided to receive the heat. generated by the LEDs 4 ', 4 "and to transmit it to the support body 2, as described in detail in the following: In more detail, there is provided a first metal strip 24 thermally coupled to the first LEDs 4' and extending between the first metal track 18 and the second metal track 19, and a second metal strip 25 thermally coupled to the second LED 4 "and extending within a second area of the fourth face 17 of the first printed circuit 20 delimited by the second metallic track 19. Preferably, each first and second LED 4 ', 4 "is fixed respectively to its own second and third printed circuits, which are in turn fixed on the fourth face 17 of the first 20 and are electrically connected respectively to the first and second metal tracks 18, 19. In particular, on the second printed circuit of each first LED 4 ', first metallized orifices are formed below the first LED 4' and contacted with the first metal strip 24 to transmit thereto the heat generated by the first LED 4 '. Similarly, on the third printed circuit of each second LED 4 ", second metallized orifices are formed below the second LED 4" and brought into contact with the second metal strip 25 to transmit thereto the heat generated by the second LED 4 "The heat generated by the LEDs 4 ', 4" is transmitted by the metal strips 24, 25, through the second thermally conductive intermediate layer of the first printed circuit 20, to the first support layer of the first printed circuit 20, which in turn transmits the heat by conduction to the support body 2. Advantageously, the light emitting device 1 comprises heat dissipation means 26 fixed on the second face 9 of the plate-shaped part 60 of the body of support 2 and capable of receiving by conduction of the support body 21a heat generated by the LEDs 4 ', 4 "to transmit it to the outside air to the emitting device In more detail, the heat dissipation means 26 comprise a plurality of elongated metal portions 27, which protrude from the second face 9 of the plate-shaped portion 60 of the orthogonally support body 2. at this second face 9, and are preferably made in a single body with the plate-shaped portion 60 of the support body 2. The predisposition of the electronic unit 5, according to the present invention, corresponding to the opening of the 11 'access defined by the second end edge 11 of the reflection body 3, allows to arrange the LED 4', 4 "on the support body 2, allowing effective heat dissipation generated by the LED 4 ', 4 ", by transfer by conduction of this heat to the external environment through the support body 2, and, advantageously, through the heat dissipation means 26. In particular, the predisposition of the electrical unit 5 in correspondence with the access opening Il 'defined by the second end edge 11 of the reflection body 3, advantageously makes it possible to predispose the heat dissipation means 26 substantially over the entire second face 9 of the plate-shaped portion 60 of the support body 2, ensuring an effective heat dissipation generated by the LEDs 4 ', 4 "mounted on the first face 8 of the plate-shaped portion 60 of the support body 2. Of Advantageously, the light emitting device 1 comprises at least one electric supply cable 28, which passes through the internal cavity 7 of the reflection body 3 and is connected at one end to the electronic unit 5 to connect this last to a source of electrical energy (not shown) connected to the other end of the power supply cable 28. In particular, the power supply cable 28 enters the internal cavity 7 d a reflection body 3 through a first opening 30 'formed on the base wall 12 of the reflection body 3. Advantageously, the power supply cable 28 passes through a first channel 29 formed in the support body 2 and communicating with the internal cavity 7 of the reflection body 3 through the aforementioned first opening 30 'formed on the base wall 12 of the reflection body 3.

Preferably, with reference to the embodiment illustrated in FIGS. 3 and 4, the first printed circuit 20, on which the LEDs 4 ', 4 "are mounted, is provided with a first passing orifice 35' aligned with the first opening 30 'formed on the base wall 12 of the reflection body 3 to allow the passage of the power supply cable 28. In accordance with the embodiment illustrated in Figure 3, the first channel 29 is mostly formed inside. a central portion 31 of the supporting body 2 projecting from the second face 9 of the plate-shaped portion 60 of the same support body 2 along the central axis X of the light emitting device 1 In particular, the first channel 29 comprises a first section 29 'coaxial with the central axis x, inside which is inserted a gland 32 tightly tight around the power supply cable 28 to seal the first channel 29 prevented infiltration of water, humidity, etc. In addition, the first channel 29 is provided with a second section 29 "developing from the first section 29 'laterally with respect to the central axis X until it opens onto the first face 8 of the plate-shaped part. 60 of the support body 2 in correspondence of the first opening 30 'of the base wall 12 of the reflection body 3 and the first through-hole 35' formed on the first printed circuit 20. The electrical connection cables 33 of the connection means 6, which connect the electronic unit 5 to the LEDs 4 ', 4 ", pass through the internal cavity 7 of the reflection body 3 and exit the inner cavity 7 through a second opening 30" formed on the base wall 12 of the reflection body 3. Advantageously, the electrical connection cables 33 pass inside a second channel 34 formed on the first face 8 of the plate-shaped portion 60 of the support body 2 and communicating with the cavit 7 of the internal reflecting body 3 through the second opening 30 "formed on the base wall 12 of the reflection body 3.

In more detail, in accordance with the embodiments illustrated in the accompanying figures, the second channel 34 is obtained by a groove formed on the first face 8 of the plate-shaped portion 60 of the support body 2. Preferably, Referring to the embodiment illustrated in FIGS. 2 and 4, the first printed circuit 20, on which the LEDs 4 ', 4 "are mounted, is provided with a second through-hole 35" aligned with the second opening 30 "formed on the base wall 12 of the reflection body 3 to allow the passage of the electrical connection cables 33. Still with reference to the embodiment illustrated in Figures 2 and 4, wherein the light emitting device 1 is positioned with the body of support 2 facing downwards, the second channel 34 extends with its third section 34 'initial (indicated in dashed lines in Figure 4) below the first printed circuit 20, and with its fourth section 34 "termi Besides the peripheral contour 21 of the first printed circuit 20. In this way, the electrical connecting cables 33 reach the terminals 22 ', 22 ", 23', 23" of the metal tracks 18, 19 made on the first printed circuit 20. passing below the latter, and thus without hindering the propagation of the first beams of light emitted by the LEDs 4 ', 4 "and second beams of light rays coming from the outer surface 14 of the reflection body 3. Preferably, the electrical connection cables 33 of the electrical connection means 6 are intercepted by an electrical terminal 36 housed in the internal cavity 7 of the reflection body 3. Preferably, the electrical connection means 6 comprise a first pair of electrical connection cables. (phase and neutral) which connect the electronic unit 5 to the first terminals 22 ', 22 "of the first metal track 18 of the first 20 LEDs 4', and a second pair of electrical connection cables (phase and neutral) which connect the electronic unit 5 to the second terminals 23 ', 23 "of the second metal track 19 of the second LED 4". Functionally, the electronic unit 5 allows the passage of current through the first pair or through the second pair of electrical connection cables to activate the first 4 'LEDs or the second LED 4' '. Advantageously, the 4 "LEDs are kept off during normal operation of the first LEDs 4 ', and are activated by the electronic unit 5 in the event that one or more of the first LEDs 4' fail, allowing the light emitting device 1 to continue to work properly. On the contrary, the electronic unit can control the activation of all the LEDs 4 ', 4 "simultaneously to enable the light emitting device 1 to emit a particularly intense light, advantageously the electronic unit 5, which controls the operation of the LEDs 4 ', 4 "comprises an electronic card 37 mounted in correspondence of the access opening 11' defined by the second end edge 11 (of larger dimensions) of the reflection body 3. In accordance with the embodiments illustrated in the accompanying figures, the electronic card 37 is fixed substantially bearing on the second end edge 11 of the reflection body 3, preferably closing the access opening 11 'defined by the same second end edge 11.

Advantageously, the predisposition according to the present invention of the electronic card 37 of the electronic unit 5 in correspondence of the access opening 11 'defined by the second end edge 11 of the reflection body 3, allows access simple and fast by an operator to the same electronic unit 5, for example to perform control operations or substitution of damaged electronic components. In particular, it is possible to access the electronic unit 5 without the need to disassemble the reflection body 3, thus avoiding long and laborious successive operations of repositioning the reflection body 3 in the correct position with respect to the LEDs 4 ', 4 "to ensure the correct projection of the second beams of light beams along the aforementioned directions of propagation Z.

With reference to the embodiment illustrated in FIG. 3, the electronic card 37 comprises a fourth printed circuit 61, which is provided with a fifth face 38, oriented towards the internal cavity 7 of the reflection body 3, and a sixth face 39 parallel to the fifth 38 and facing outward reflection body 3. The electronic card 37 further comprises electronic components 40 preferably fixed on the fifth face 38 of the aforementioned fourth printed circuit 61 and powered by the In particular, the electronic components 40 comprise a central unit, which is programmed to control the operation of the LEDs 4 ', 4 "by a current controller module connected to the electrical connection cables 33 which connect the electronic unit 5 to the power supply circuit 15 of LEDs 4 ', 4 ". Advantageously, in accordance with another embodiment not illustrated, the electronic unit 5 comprises a subsequent electronic card supported on the sixth face 39 of the electronic card 37, and provided with further electronic components connected to the LEDs 4 ', 4 "The predisposition of the above-mentioned electronic card on the sixth face 39 of the electronic card 37 makes it possible to significantly implement the functions of the electronic unit 5 without any substantial construction complication of the light emitting device 1 Preferably, a brightness sensor 41 is provided, which is fixed to the fourth printed circuit 61 of the electronic card 37 and is electrically connected to the central unit of the electronic unit 5 to signal the intensity of the ambient light and therefore, to control the activation or not of the light emitting device 1. In more detail, with reference to In the embodiment illustrated in FIG. 3, the brightness sensor 41 is fixed on the fifth face 38 of the fourth printed circuit 61, oriented towards the internal cavity 7 of the reflection body 3, in correspondence of a third passing orifice 42 formed. on the same fourth printed circuit 61, to allow the ambient light to reach the brightness sensor 41. Advantageously, the predisposition of the brightness sensor 41 on the electronic card 37 fixed in abutment on the second end edge 11 of the reflection body 3, makes it possible to protect this brightness sensor 41 from the first beams of light rays emitted by the LEDs 4 ', 4 "disposed on the plate-shaped part 60 of the support body 2, in such a way that the sensor 41 exclusively detects the ambient light, ensuring the correct activation of the light emitting device 1. Advantageously, the electronic card 37 of the electronic unit 5 is fixed to the reflection body 3 by first fixing means 43, which comprise a tie rod 44 connected between the support body 2 and the electronic card 37 to hold the latter on the second end edge 11 of the reflection body 3 and to retain the reflection body 3 fixed to the support body 2. With reference to the embodiment illustrated in Figure 3, the tie rod 44 of the first fastening means 43 comprises a threaded rod 45 which is mechanically fixed to its own first end portion 46, to the electronic card 37, and is mechanically attached, at its own second end portion 47, to the support body 2. In more detail, the threaded rod 45 is screwed to its second end portion 47 in a fourth port corresponding thread 48 formed on the first face 8 of the plate-shaped portion 60 of the support body 2, and is inserted with its first end portion 46 into a fifth hole p Corresponding assent 49 formed on the electronic card 37. In addition, the first fixing means 43 comprise a first nut 50, which is screwed to the threaded rod 45 in correspondence of its first end portion 46 and acts on the sixth face 39 of the fourth printed circuit board 61 of the electronic card 37 (facing outwardly of the reflection body 3), and a first counter nut 62, which acts on the fifth face 38 of the fourth printed circuit 61 to hold the electronic card 37 attached to the body 3. Preferably, the first attachment means 43 comprise a second lock nut 51 screwed to the threaded rod 45 in correspondence of its second end portion 47 and acting on the internal face of the base wall 12 of the reflection body. 3.

In accordance with the embodiments illustrated in the accompanying figures, the reflection body 3 rests with its base wall 12 on a central portion of the first printed circuit 20 on which the LEDs 4 ', 4 "are mounted. 20 is provided, in correspondence of this central portion, with a sixth passing orifice 52 aligned with the fourth threaded orifice 48 formed on the first face 8 of the plate-shaped portion 60 of the support body 2 and traversed by the threaded rod 45 of the first fixing means 43. Advantageously, the first printed circuit 20, on which the LEDs 4 ', 4 "are mounted, is fixed to the first face 8 of the plate-shaped portion 60 of the support body 2 by second securing means, which comprise a plurality of screws 53 screwed into seventh corresponding threaded holes 54 formed on the first face 8 of the plate-shaped portion 60 and aligned on eighth passing orifices Corresponding members 55 formed on the same printed circuit 20. In particular, with reference to the embodiment illustrated in FIG. 2, the seventh threaded orifices 54 extend partially into the corresponding metal elongated portions 27 of the heat dissipating means 26 which develop. protruding from the second face 9 of the plate-shaped portion 60 of the support body 2. In accordance with the embodiments illustrated in the accompanying figures, the light-emitting device 1 comprises a closure cap 56, which is fixed in abutment on the first face 8 of the plate-shaped portion 60 of the support body 2 defining with the latter a sealed chamber 57 inside which are housed the LEDs 4 ', 4 "and the reflection body 3 with the electronic unit 5. In more detail, with reference to FIG. 3, the cap 56 is made of transparent material, preferably in plexiglass, and is provided with e of an enlarged base 58, preferably of circular shape, which rests on the first face 8 of the plate-shaped portion 60 of the support body 2 in correspondence of a peripheral edge thereof. Preferably, the enlarged base 58 of the cap 56 is fixed to the first face 8 of the plate-shaped portion 60 of the support body 2 by an adhesive binder interposed between the latter and the enlarged base 58 of the same cap 56. In accordance with the second embodiment of the light emitting device 1 illustrated in FIG. 5 and relating to a lighting apparatus, the light emitting device 1 comprises a reflection bell 59 fixed to the support body 2 and developing around the first reflection body 3 for the interception of the second beams of light rays coming from the external surface 14 of this same first reflection body 3. Functionally, the reflection bell 59 reflects the second beams of light rays coming from the surface external 14 of the reflection body 3 with third beams of light rays oriented towards the environment to be illuminated. In particular, in the second embodiment illustrated in FIG. 5, the light emitting device 1 is positioned with the concavity of the reflection bell 59 facing downwards to illuminate, for example, the floor of a room.

The invention thus conceived thus achieves the pre-established objectives.

Claims (13)

REVENDICATIONS1. Light emitting device (1), which comprises: a support body (2); a reflection body (3) which is fixed to said support body (2), is provided with at least one internal cavity (7), and develops between its own first end edge (10), corresponding to which it is attached to said support body (2), and its own second end edge (11) spaced from said support body (2); a plurality of LEDs (4 ', 4 ") fixed to said support body (2) and positioned around said reflection body (3); - at least one electronic unit (5) connected to said LEDs (4', 4") by means of electrical connection means (6) for controlling its operation; said light emitting device (1) being characterized in that the second end edge (11) of said reflection body (3) defines an access opening (11 ') to the internal cavity (7) of said reflection body (3), and said electronic unit (5) is positioned in correspondence of said access opening (11 ') defined by the second end edge (11) of said reflection body (3). 2. Light emitting device (1) according to claim 1, characterized in that said electronic unit (5) is housed at least partially in said internal cavity (7) of said support body (2). 3. Light emitting device (1) according to claim 1, characterized in that said electronic unit (5) comprises at least one electronic card (37) mounted in correspondence of said access opening (11 ') defined by the second end edge (11) of said reflection body (3). 4. Light emitting device (1) according to claim 3, characterized in that said electronic card (37) is fixed substantially bearing on the second end edge (11) of said reflection body (3). Light-emitting device (1) according to claim 1, characterized in that said reflection body (3) has a substantially frustoconical shape with said second end edge (11) of dimensions greater than said first end edge ( 10). Light-emitting device (1) according to claim 1, characterized in that said reflection body (3) is provided with at least one base wall (12) fixed on the first end edge (10) of said reflection body (3); said light emitting device (1) comprising at least one power supply cable (28), which is connected to said electronic unit (5) and enters the internal cavity (7) of said reflection body (3) through to at least one opening (30 ', 30 ") formed on the base wall (12) of said reflection body (3). Light-emitting device (1) according to claim 6, characterized in that said electrical connection means (6) comprise electrical connection cables (33), which pass through the internal cavity (7) of said reflection body (3), and exit from the internal cavity (7) of said reflection body (3) through said at least one opening (30 ', 30 "). Light-emitting device (1) according to claim 6, characterized in that said at least one power supply cable (28) passes through a first channel (29) formed in said support body (2) and communicating with said internal cavity (7) through said at least one aperture (30 ', 30 ") formed on the base wall (12) of said reflection body (3). Light-emitting device (1) according to claim 7, characterized in that the electrical connection cables (33) of said electrical connection means (6) pass through a second channel (34), which is formed on a first face (8) of said support body (2), on which said LEDs (4 ', 4 ") are positioned, and is connected to the internal cavity (7) of said reflection body (3) by said at least one opening (30); ', 30 ") formed on the base wall (12) of said reflection body (3). Light emitting device (1) according to claim 7, characterized in that the electrical connection cables (33) of said electrical connection means (6) are intercepted by at least one electrical terminal (36) housed in the internal cavity. (7) of said reflection body (3). Light-emitting device (1) according to claim 1, characterized in that said support body (2) is provided with a first face (8) on which said LEDs (4 ', 4 ") are fixed and said reflection body (3), and a second face (9), substantially parallel to said first face (8) and oriented in the opposite direction thereto, said light emitting device (1) comprising dissipation means thermal device (26) fixed on the second face (9) of said support body (2). Light-emitting device (1) according to claim 3, characterized in that said electronic card (37) is fixed to said reflection body (3) by first fixing means (43), which comprise at least one tie rod ( 44) connected between said support body (2) and said electronic board (37) to retain the latter on the second end edge (11) of said reflection body (3). Light-emitting device (1) according to claim 11, characterized in that said electrical connection means (6) comprise a first printed circuit (20) fixed to said support body (2), and provided with a third face (16) fixed above the first face (8) of said support body (2), and a fourth face (17) on which said LEDs (4 ', 4 ") are mounted; at least one metal strip (24, 25) thermally coupled to said LEDs (4 ', 4 ") being provided on the fourth face (17) of said first printed circuit (20).