AT508479A2 - LAMP FOR A DECORATING GRAIN - Google Patents

Description

································································································································································ THE ONE POWER ELECTROLUMINESCENCE DIODE AND A GARLAND FOR DECORATION. WHICH IS EQUIPPED WITH SUCH LAMPS. INCLUDES.

5 DESCRIPTION

TECHNICAL FIELD OF THE INVENTION

The present invention relates to a decorative garland lamp, wherein said lamp comprises a power electroluminescent diode. The present invention also relates to a light garland equipped with such a lamp.

The present invention relates to the technical field of miniature lamp used for decoration and comprising a power electroluminescent diode connected to the ends of cables for electrical supply, said ends being embedded in resin.

STATE OF THE ART 20

The lighting garlands or curtains for decorative lighting consist of small size electric lamps arranged at regular intervals along cables for electrical supply and mounted directly on said cables. With reference to Figure 1, which is appended, these lamps generally consist of a power electroluminescent diode 1 (or LED) which is connected to the ends of cables 3 used for electrical supply. In order to avoid having to have access to the parts that are live, the base of the LED 1 and the ends of the cables 3 are housed in a tube 4. This tube is generally made of silicone coated with a layer of PVC 30. The LEDs, which typically have poor performance, i.e., one

Have power that is below 0.1 watts, the tube 4 is not exposed to thermal stress. ················· ···· ··· ··· ·

The current standards require on the one hand that the elements under tension can not be touched in the event of damage and on the other hand that the LED can only be torn out in the event that a heavy load is applied (50 pulls at 30 Newtons for most homology tests). Patent EP 1 185 821, in the name of the Applicant, discloses a safety device for a miniature pebble used for decoration. This device is schematized on Figure 2, which is in the appendix. A sleeve 6, which resists the heat, is cast on the LED 1 and on the ends of the cables 2. This sleeve 6 guarantees protection against the tearing out of the LED, while at the same time avoiding access to the parts which are under tension, and this is especially true when the said LED has been broken. Here, the LEDs are typically low in power, i. a power below 0.1 watts, so that the sleeve is in reality exposed to a very low thermal load. 15 The so-called power LEDs are known, which produce a luminous flux much higher than that of the classic LED. These LEDs have an electrical power above or equal to 0.1 watts, with some LEDs can reach tens of watts. These LEDs consist of a light emitting chip or multiple light emitting chips (which chips are typically semiconductors), which chips are then electrically connected to two electrodes. The chips are generally in one

Embedded substrate layer. The heat emitted by this LED is so high that it is necessary to dissipate said heat. If the assembly of Figure 1 is maintained and if the LED 1 is replaced by a power LED, then the tube 4 melts after a few minutes. This is also the case if the assembly of Figure 2 is maintained and the LED 1 is replaced by a power LED so that the sleeve 6 can not withstand the thermal stresses to which it is exposed for a long time.

In view of this, the principal object of the present invention is to propose a lamp with a power LED capable of effectively radiating the heat which it emits, while at the same time providing protection against the rupture of said LED and access to the conductive parts is avoided. ·· ···· ·· ····· ····· · · · * .7 | ♦ · · · · · · · · · · · • ♦ ♦ # ··· · * ···· · # · · · · · · · · · · · · ♦

Another object of the present invention is to perfect the lamp described in EP 1 185 821 to replace the classic LED that it contains with a power LED.

5 DISCLOSURE OF THE PRESENT EXPERIENCE

The solution proposed by the invention is a decorative garland lamp, said lamp comprising a power LED connected to the ends of cables for electrical supply. This lamp is remarkable for the reason 10, because the said diode on a heat converter, which takes the form of a

Pipe has, is mounted, said heat exchanger surrounds the ends of the cable. In addition, said heat converter is at least partially filled with resins, which resin has properties that guarantee electrical insulation, and which resin surrounds the ends of the cables. 15

The resin not only allows good electrical insulation, but it also guarantees effective protection against tearing out. The heat converter has a double function as far as it is concerned: first, it should radiate heat and, secondly, serve as a receptacle for the resin. 20

The heat converter is preferably a hollow rigid cylindrical member made of a material serving to conduct the heat and in which element an outer wall is finned. 25 The cylindrical element and the fins are preferably made of metal and are electrically insulated.

According to an advantageous feature of the present invention, which allows to simplify the design of the lamp, the power diode is arranged on a projection 30 which conducts heat and which is fixed to the upper end of the heat converter. ················································································

The power diode is preferably covered with optics attached to the hub which conducts heat, said optic being surmounted by a concave conical dome extending downwardly and having a completely different shape. According to another advantageous characteristic of the present invention, the optic is on the approach which serves for heat conduction.

According to an advantageous feature of the present invention, which makes it possible to simplify the design of the lamp and reduce the dimensions of said lamp to 10, the power diode is formed of two electrodes which are electrically connected to a light-emitting chip or multiple light-emitting chips are, wherein said chips are embedded in a substrate layer, which is arranged directly on the approach, said approach serves as a heat conductor. The heat-conducting projection preferably comprises a front side and a

Rear side, wherein said front side is configured so that it can receive the power diode and wherein said rear side is provided with a thread, which cooperates with a complementary thread, which is executed at the level of the upper end of the heat converter. 20

Another aspect of the present invention relates to a decorative garland formed according to one of the preceding characteristics from a succession, said lamps being arranged at regular intervals and not along cables serving for electrical supply, and said lamps being direct mounted on 25 said cables.

DESCRIPTION OF THE FIGURES

Other advantages and features of the present invention will become more apparent upon reading the description of a preferred embodiment which follows, with reference to the attached drawings, which are given by way of non-limiting example and on which drawings: FIG ······ · ♦ ···· »· · 9 & 9 9 999 9 9 9 9 «• 4 '· · · ···· * · · ·······················································

The aforesaid FIG. 1 is a sectional view of a lamp for a decorative lamp, which is known from the prior art,

The aforesaid Figure 2 is a sectional view of a decorative garland lamp of the type described in document EP 1,185,821; Figure 3 is a sectional view of a garland decoration lamp according to the invention;

Figure 4 is a schematic perspective view of part of a garland equipped with lamps according to the invention.

10 EMBODIMENTS OF THE PRESENT INVENTION

The lamp L, which is the subject of the present invention, is intended to equip decorative garlands. For the purposes of the present invention, light wires / light curtains are considered decoration garlands. With reference to Figure 4, this decorative garland is formed from a succession of lamps L arranged at regular intervals and not along the cables 30 used for electrical supply and mounted directly on said cables.

With reference to Figures 3 and 4, the lamp L has a generally cylindrical shape. Its diameter is about 22 mm. Other shapes and dimensions may be provided in any case. Said lamp comprises a power electroluminescent diode 10 (which diode is hereinafter referred to as LED), which diode is connected to the ends of cables 30, which serve for electrical supply. Power LED is understood to mean an LED whose electrical power 25 is above 0.1 Watts or equal to 0.1 Watts. In a classical manner, the power LED 10 is formed of two electrodes electrically connected to a light emitting chip or multiple light emitting chips, said chips being embedded in a substrate layer 100. The electrodes, i.e., an anode and a cathode, are electrically supplied via the cables 30. Because this conception is known to those skilled in the art, it will not be described in further detail here. . · T «··· · · * · · · t t ···· ·« ·· ··· · · · ·

The power LED 10 may operate at a very low voltage, i. work in a typical way at 24 volts but also at 230 volts. According to the power source to which the cables 30 (mains, battery, etc.) are connected, it may be provided to couple the power LED 10 to a transformer mounted with a rectifier. The 5 power LED 10 may also be coupled to a programmer which allows the light intensity of the chips to be varied and / or to turn on the said chips in various ways.

According to the present invention, the power LED 10 is mounted on a tubular heat exchanger 20 surrounding the cables 39. In practice, this heat converter 20 is a hollow rigid cylindrical member made of a material which conducts heat and whose outer wall is provided with fins 200. These last fins allow to strengthen the exchange surface with the ambient air. Since the decorative garlands are generally suspended in the void, the ambient air circulating around the lamp L promotes the conversion phenomena and helps cool the said lamp.

By way of example and not limitation, the heat converter 20 is in the form of a hollow cylindrical member whose outer diameter is approximately 10 mm 20 and whose inner diameter is approximately 8 mm. Referring to Figs. 3 and 4, the fins 200 are in the form of coaxial clamps with a hollow cylindrical member and which fins run parallel to each other. These fins 200 are spaced from each other by about 2 mm. Any other form of fins may be provided, that is, elongated fins parallel to the longitudinal axis of the hollow cylindrical member.

The material used to carry out the heat converter 20 may be metal, graphite, ceramic, or it may also be carbon fibers or any other material capable of efficiently radiating the heat. In the case where a metal material is used, the cylindrical member constituting the heat converter 20 and the fins 200 must be insulated by covering, for example, an insulating sheath with the target, the electric insulation of the lamp L guarantee. ΦΦ Μ ΦΦΦ Φ Φ Φ Φ Φ U φ φ φφ φφφφ ·φφφφφφφφφφφφφφφφφφφφφφφφφφφφφφφφφφφφφφφφφφφ

In any case, as explained further below in the present description, there is a priori no risk of the ends of the cables 30 coming into contact with the inner walls of the heat converter 20 and thus causing the user to be electrically shocked 5 Lamp L, which is live, handles.

With further reference to FIG. 3, the power LED 10 is advantageously disposed on a tab 1000 which conducts the heat and is screwed onto the top of the heat converter 20. In practice, the projection 1000 is made of the same material as the heat converter 20. It is a substantially cylindrical element that includes: A front panel configured to receive the elements that make up the power LED. In particular, a bore is made on this front side 15 and in which bore the substrate layer 100 is arranged, which surrounds the light emitting chip or the light emitting chip and the two electrodes of the power LED 10; A rear end provided with a thread 1001 cooperating with a complementary thread made at the level of the upper end of the heat exchanger 20. One could equivalently provide a lug 1000 provided with an internal thread and cooperating with a thread formed on the external side of the heat converter 20. In one embodiment variant, it would be possible to glue the rear side of the projection 1000 onto the upper end of the heat converter 20. After the attachment of the neck 1000, the upper end of the heat exchanger 20 is closed, and said heat exchanger may suitably serve as a container for the resin 50.

The power LED 10 is preferably covered with optics 60 mounted on the tab 1000, said optic being surmounted by a convex hemispherical dome extending upwardly. The optic 60 is made of a transparent or transparent polycarbonate, which is colored or not executed. In any case, with reference to Figure 3, it will be preferable to use an optic 60 surmounted by a conical, concave dome extending downwardly. These ··························································································································································································································· • Conical concavity has the effect of distributing the light in a quasi-multidirectional manner at a fixed angle of the order of 320 °, which contributes to improving the lighting effect of the unit. The optic 60 is screwed onto the tab 1000 in a preferred manner. In the example of FIG. 3, the optic 60 is provided with an internal 5 thread 600 which cooperates with a thread formed on the external face of the front face of the projection 1000.

According to the present invention, the heat converter 20 includes the resin 50 having the properties of being electrically insulating. In practice, the resin 50 10 is injected once the power LED 10 is positioned on the heat converter and the LED is connected to the ends of the cables 30. After injection, said cables are buried in the resin 50, which not only provides effective protection against tearing or provides good electrical insulation. The heat converter 20 may be wholly or partially filled with a resin 50, the amount of resin depending on the desired limit rip-off stresses. For a heat converter 20, for example having the above-mentioned dimensions, and to avoid ripping out after 50 consecutive pulls of 30 Newtons, the heat converter 20 is completely filled up. The resin 50 used may be an epoxy resin, a silicone, a polyimide, a polycarbonate, etc. Said resin may be rigid or flexible, the rigidity of the heat converter 20 protecting it against any impact or crush.

Claims (10)

5 •·························································································································································································································· A lamp for a decorative garland, said lamp (L) comprising a power LED (10) connected to the ends of cables (30), characterized in that the power diode (10) is mounted on a heat exchanger (20) having the shape of a pipe, said heat converter surrounding the ends of the cables, said heat converter being at least partially filled with resin (50) having resin properties guarantee electrical insulation and this resin surrounds the ends of the cables. 2. A lamp according to claim 1, wherein the heat converter (20) is a hollow, rigid, cylindrical member which is made of a heat-conducting material and whose outer wall is provided with fins (200). 15 3. A lamp according to claim 2, wherein the cylindrical member (20) and the fins (200) are made of metal and are electrically insulated. A claim according to any one of the preceding claims, in which the power diode (10) is disposed on a projection (1000) which conducts the heat and is secured to the upper end of the heat converter (20). 20 5. A lamp according to claim 4, wherein the power diode (10) is covered with optics (60) attached to the neck (1000) which conducts the heat. 6. Lamp according to claim 5, in which the optic (60) is surmounted by a conical, concave dome extending downwards. 7. Lamp according to one of the claims 5 to 6, in which the optics (60) on the neck (1000), which conducts the heat, is screwed. 25 A lamp according to any one of claims 4 to 7, wherein the power diode (10) is formed of two electrodes electrically connected to a light emitting chip or multiple light emitting chips, said chips being formed in a substrate layer (100 ), which is arranged directly on the projection (1000), said approach serving as a heat conductor. A lamp as claimed in any one of claims 5 to 8, wherein the heat conductive tab (1000) preferably comprises a front and a rear side, said front side being configured to receive the components of the power diode (10) and said rear end with a thread 30 99 ··· ♦ 9999 • 999 9 9 999 9 9 9 99 99 9 9 9 999 9 9 (1001), which cooperates with a complementary thread at the level of the upper one End of the heat converter (20) is executed. Decorative garland, characterized in that it is constituted by a succession of lamps (L) corresponding to claims 1 to 9, said lamps being arranged at regular intervals and not along cables (30) for electrical supply are arranged, and said lamps are mounted directly on said cables.