Classifications

• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B33/00—Electroluminescent light sources
  • H05B33/02—Details
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B33/00—Electroluminescent light sources

Definitions

• This invention relates to supplementary lighting devices, specifically electroluminescent supplementary lighting devices which have a non-planar "three- dimensional" configuration.
• the configuration of the present invention permits substantially the entire front face of the device to emit light.
• supplementary lighting devices particularly as night lights
• supplementary lighting devices are employed so as to provide illumination in a darkened hallway, illumination in bathrooms, or in children's and infants' bedrooms and the like, without the necessity to turn on the primary lighting.
• other purposes for the present invention may be found in aisles of public conveyances and venues such as airplanes, buses, theatres, and the like, the present discussion is particularly directed to night lights, because that is the most common embodiment.
• Night lights as their name suggests, find their usefulness when it is dark. They typically plug into an AC wall receptacle, where they will reside for a lengthy period of time. Prior art devices such as night lights are typically found in one of several categories.
• Incandescent lamp technology which is relatively bright, and is economical to manufacture.
• these kinds of night lights need an "on/off switch; often an automatic one which functions tinder control of a light sensing device such as a light sensitive resistor or diode.
• the cost of replacement of incandescent bulbs in the socket of such night lights is relatively low, as is their initial cost.
• incandescents have several other disadvantages.
• the ⁇ tend to have a short life with a relatively-high power consumption and a low efficiency of about 10%.
• incandescent night lights tend to be a bright point-source light, so that their light output is relatively obtrusive.
• incandescent-style night-lights have dangerously hot bulb surfaces. Indeed, the inadvertent placement of such as a blanket or paper over the night light could result either in melting of the plastic housing of the night light or, worse, fire.
• Another category of night light uses neon bulb technology, which has relatively low initial cost and very low power consumption, but which has a very low, typically red-coloured light and a rapid decay in their light output. Such weak light output as there is also tends to be seen as a point source, but provides little significant illumination of even the closely-adjacent area.
• Fluorescent lighting devices are also used as night lights, but they tend to be expensive, requiring special circuitry to initiate their illumination and to then maintain their operation economically. They are very bright, but often too bright for many applications.
• electroluminescent night lights have become popular because of several significant advantages.
• One advantage is that they have a broad light output area, so that they are not a point source and therefore less obtrusive.
• they are very energy- efficient devices, so economical that they can be plugged in and essentially forgotten for their working life. Also, because of their light-generating technology they are cool to the touch.
• electroluminescent lighting devices have a reasonably long life.
• a typical electroluminescent night light has an appearance which is not unlike the front face of a television set in some respects, in that comprises a window which is set into a planar front face, with a significant frame around and particularly below the window.
• the window is set into the front face, and an electroluminescent panel resides behind that window.
• the electroluminescent panel has a green glow.
• a pair of electrical prongs extends from the back surface of the panel, in a region below the window and on the opposite face - the back face - of the night light housing.
• Prior art electroluminescent night lights have some disadvantages. For instance, because they typically comprise a flat panel, their illumination is primarily directed perpendicularly from their face. The electroluminescent panel may illuminate somewhat to the sides, but it is limited illumination because the electroluminescent panel set well back behind the front face window.
• the amount of light which can be generated through the window is not great, since they do not provide a large surface area for an electroluminescent panel, being limited by mechanical interference from the electrical blades and often by the need to restrict the size to one-half of a wall outlet. Since this restricts the window size to a fraction of the overall lamp size, their decor may not be optimal.
• electroluminescent supplementary lighting device of the present invention provides an electroluminescent supplementary lighting device which has a multi-planar "three-dimensional configuration", as compared to the primarily mono-planar prior-art.
• the three-dimensional configuration gives further several advantages. They include:
• electroluminescent supplementary lighting devices in keeping with the present invention are more easily adapted to provide certain international AC-blade forms which have a greater need for body depth.
• electroluminescent supplementary lighting devices in keeping with the present invention have better dispersion of light in directions other than more or less perpendicular to the AC wall outlet. This is because the multi-planar front face plate emits light in many more directions.
• substantially the entire front face of the present invention is light emitting. They are much more visible, and provide considerably greater illumination to the immediately surrounding area. There are also some decor advantages which evidence themselves from a fully-lit design style, since electroluminescent supplementary lighting devices, in keeping with the present invention are effectively both "frameless" in appearance, and also since there are various possible three-dimensional configurations, they present more opportunities to have a shape which may be more pleasing and acceptable, from an aesthetic point of view, to a broader cross-section of the population.
• a plug-in electroluminescent lighting device is known from DE FRANCISCO
• DICKSON United States patent No. 4,138,620 issued February 6, 1979 provides a multi-panel mono-planar electroluminescent panel assembly which comprises a plurality of uniformly illuminated overlapping electroluminescent panels. Their purpose is to provide a graphic advertising or signboard display which is essentially back-lit by electroluminescent panels, and which has a substantially flat structure.
• TOKARZetal. United States patent No.4,864,473 issued September 5, 1989 provides an electroluminescent dome light which is intended particularly to be placed into a convertible automobile vehicle. Its purpose is to provide a quick high light output by being mounted in a convenient place within the convertible automobile, and to take the place of a roof-mounted dome light which, of course, is not found in a convertible automobile.
• MARISCHEN was granted United States Design patent No. DES 352,564 which issued November 15, 1994 and United States patent No. 5,662,408 which issued September 2, 1997, each directed to a low profile, mono-planar, electroluminescent night light. It is to the widely-used Marischen-style night lights and to others of its same genera! appearance and construction, that many of the above comments have been directed, as to the disadvantages thereof..
• an electroluminescent supplementary light device which has a multi-planar three-dimensional configuration.
• the device comprises an electroluminescent panel and a housing within which the electroluminescent panel is located.
• the electroluminescent panel is such that its construction includes front and back electrically conductive layers with an electroluminescent phosphor layer and a dielectric layer disposed therebetween.
• a housing having a substantially planar rear wall through which a pair of electrical prongs protrude for placement into mating slots of an AC power receptacle.
• a translucent front face protrudes forwardly away from the substantially planar rear wall, so as to define an enclosed volume between the substantially planar rear wall and the front face.
• the electroluminescent panel has a predetermined shape. At least one electrical connection to each of the front and back electrically conductive layers is made.
• Electrically conductive leads extend away from the electrical connection for each of the front and back electrically conductive layers, and the electrically conductive leads have sufficient length and flexibility so that they extend into the enclosed volume for electrical connection to the electrical prongs within the enclosed volume.
• the translucent front face has edges which terminate at the edges of the substantially planar rear wall, and adjacent edges of the translucent front face and of the substantially planar rear wall are attached one to the other.
• the electroluminescent panel is configured so that at least one side edge is placed in the region where an edge of the translucent front face is attached to an edge of the substantially planar rear wall.
• the electroluminescent panel protrudes forwardly away from the at least one side edge so as to be contiguous to at least a major portion of the translucent front face.
• a particular embodiment of the electroluminescent supplementary lighting device of the present invention has the translucent front face configured so as to curve forwardly from a pair of opposed side edges of the substantially planar rear wall, so as to thereby define the enclosed volume so as to be forward of the substantially planar rear wall, behind the curved translucent front face and between upper and lower edges thereof.
• the substantially planar rear wall has four side edges to which the translucent face can be respectively attached; and the electroluminescent panel is configured as a partial cylinder by arching a rectangular two-dimensional panel so that two opposed sides of the electroluminescent panel form an arch which corresponds to the arch of the curved translucent front face.
• Another embodiment of the present invention which is a variant of the partially cylindrical configuration, has upper and lower faces which extend rearwardly from the upper and lower edges of the curved translucent front face to the substantially planar rear wall, and the upper and lower faces each comprise an electroluminescent panel.
• the electroluminescent supplementary lighting device of the present invention has the translucent front face configured so as to curve forwardly such that the radius of curvature of the curved shape at one of the upper and lower edges is different from the radius of curvature at the other of the upper and lower edges. This defines a partial, truncated conic enclosed volume forward of the substantially planar rear wall, behind the curved translucent front face.
• the substantially planar rear wall has four side edges which form a trapezoid to which the translucent face is attached.
• Another variation of the electroluminescent supplementary lighting device of the present invention is such that the translucent face has a configuration of a truncated pyramid, comprising a rectangular top surface and four side surfaces sloping downwardly therefrom.
• the substantially planar rear wall has four side edges to which the translucent face can be respectively attached.
• the configuration is such that the truncated pyramid comprises a rectangular top surface and four side surfaces sloping downwardly therefrom, such that each of the side surfaces has a trapezoidal shape.
• Each of side surfaces of the electroluminescent panel is separated from the adjacent ones of the side surfaces; and the top edges of each of the side surfaces are contiguous to and electrically connected with the rectangular top surface at the respective front and back electrically conductive layers of each.
• the electroluminescent panel is disposed so as to nestle within the enclosed volume between the translucent face and the substantially planar rear wall, so that each of the side surfaces of the translucent face rests adjacent and above a corresponding one of the side surfaces of the electroluminescent panel.
• one of the surfaces of each of the translucent front face and of the electroluminescent panel is square.
• connection to each of the front and back electrically conductive layers is made at the at least one side edge by connectors which are chosen from the group consisting of a pair of staples connected one to each of the respective electrically conductive layers, a pair of electrically conductive terminal pads secured one to each of the respective electrically conductive layers, and a pair of electrically conductive clips attached one to each of the respective electrically conductive layers.
• connection tab may extend from the at least one side edge.
• the connection tab includes electrically conductive extensions of each of the front and back electrically conductive layers; and a pair of connection terminals extends away from the connection tab, one for each of the front and back electrically conductive layers, and is electrically insulated one from the other.
• connection terminals An electrical connection is made between each of the connection terminals and a respective one of the electrical prongs; and the connection tab is folded from the at least one side edge of the electroluminescent panel so as to extend therebehind into the enclosed volume.
• the size of the electroluminescent panel is such that the electroluminescent panel will fit snugly to the interior surface of the translucent front face.
• the side edges of the translucent face are attached to the side edges of the substantially planar rear wall by sealing means which are chosen from the group consisting of ultrasonic welding, mutually compatible solvents, adhesives, double-sided adhesive tapes, overlaid adhesive tapes, snapping adjacent edges together, and mixtures thereof.
• edges of the translucent front face do not terminate at the edges of the substantially planar rear wall, but they terminate at some intermediate position inwardly of the edges of the substantially planar rear wall but on the substantially planar rear wall.
• Figure 1 is a perspective view of a first embodiment of an electroluminescent supplementary lighting device, in keeping with the present invention, seen from the front;
• Figure 2 is a perspective view of the embodiment of Figure 1, seen from the rear;
• Figure 3 is a side elevation of the embodiment of Figure 1 ;
• Figure 4 is a perspective view of an electroluminescent panel which is the light emitting element of the embodiment of Figure 1;
• Figure 5 is a perspective view of a second embodiment of electroluminescent supplementary lighting device in keeping with the present invention, seen from the front;
• Figure 6 is a perspective view of the embodiment of Figure 5, seen from the rear;
• Figure 7 is a side cross-sectional view of the embodiment of Figure 5;
• Figure 8 is a plan view of the electroluminescent panel employed in the embodiment of Figure 5;
• Figure 9 is a perspective view of the electroluminescent panel as it is employed in the embodiment of Figure 5, when partially configured for use in that embodiment;
• Figure 10 is a perspective view of the electroluminescent panel of the embodiment of Figure 5, configured for use.
• Figure 11 is a view similar to Figure 1 of a further embodiment of an electroluminescent supplementary lighting device in keeping with the present invention, having a partial conic configuration; and
• Figure 12 is a view similar to Figure 2, of the embodiment of Figure 1 1.
• the present invention provides an electroluminescent supplementary lighting device. It is well known, to those skilled in the art of electroluminescent panel design, that any electroluminescent panel of the sort which finds utility in electroluminescent supplementary lighting devices of the type described herein will typically be comprised of a sandwich-type construction consisting of flexible front and back outer plastic non-conductor layers covered on their inner surfaces with electrically conductive layers which have on their inner layers an electroluminescent phosphor layer and a dielectric layer disposed therebetween. However, the precise layer structure of electroluminescent panels is beyond the scope of the present invention.
• the electroluminescent panel which is normally manufactured in a two-dimensional configuration, now has an alternate three-dimensional configuration, Such configurations are shown, for example, in Figures 1 , 5, and 1 1 ; with the embodiments being shown in various particulars in Figures 1 through 4, 5 through 10, and 11 and 12 respectively.
• the principal components of the electroluminescent supplementary lighting device of the present invention are an electroluminescent panel, having a predetermined shape and commonly having a connection tab at one edge thereof; and a housing piece which comprises a substantially planar rear wall, and a translucent front face piece which protrudes forwardly away from the planar rear wall. A pair of electrical prongs protrude through the planar rear wall.
• Embodiment 10 comprises a housing which has a substantially planar rear wall 12, and a translucent front face 14.
• Embodiment 31 is a partial conical configuration variant of embodiment 10, and also has a translucent front face 14.
• Embodiment 50 comprises a substantially planar rear wall 12, and a translucent front face 54.
• Each of embodiments 10 and 50 includes a pair of electrical prongs 16 which protrudes through the planar rear wall for placement into mating slots of an AC wall receptacle which has household voltage imposed between the mating slots thereof.
• any embodiment 10, 50 or 31 the translucent front face 14 or 54 protrudes forwardly away from the planar rear wall 12, so as to define an enclosed volume within the housing.
• the enclosed volume within the housing of embodiments 10 and 31 will be understood from an examination of Figures 1 through 3; the enclosed volume within the embodiment 50 is more the specifically depicted as enclosed volume 56 in Figure 7.
• the electrical prongs 16 extend through the planar rear wall 12 into said enclosed volume.
• Each electroluminescent panel has a predetermined two-dimensional shape which can be bent or otherwise configured into a predetermined three-dimensional shape.
• electroluminescent panel 20, shown in Figure 4 which would normally be manufactured as a two-dimensional flat rectangle, can also have a generally curved three-dimensional shape, as will be discussed hereafter.
• the flat electroluminescent panel 60, shown in Figure 8 can take the three-dimensional configuration of a truncated pyramid 62, shown in each of Figure 9, and as discussed hereinafter.
• each electroluminescent panel 20 or 60 has at least one side edge 22 or 62, at which electrical connections are made to each of the front and back electrically conductive layers within the electroluminescent panel 20 or 60.
• the electrical connections are made via a connection tab 24 or 64, as described hereafter, from which electrically conductive leads extend into the enclosed volume behind the respective electroluminescent panel 20 or 60.
• Such leads will have sufficient length and flexibility to connect directly or indirectly - through intervening electronic circuitry 70 as discussed hereafter - to the electrical prongs 16.
• connection points can indeed be created at almost any location on the panel; and it will also be evident that more than one pair of connection points can be created for said panels.
• the electrical connections are made right at the side edges 22 or 62, there may be an area at that side edge in the region of the electrical connection where, of course, there may be no local electroluminescence because the structure of the electroluminescent panel will have had to be altered at the connection region so as to permit electrical connections for each of the front and back electrically conductive layers. For this reason, tab extensions of the material are common.
• Such electrical connections may be via a pair of staple-pins which are connected to the respective electrically conductive layers.
• Other connections which may be made to the respective electrically conductive front and back layers of the electroluminescent panels 20 or 60, may be via a pair of electrically conductive terminal pads - essentially, conductive traces or pads - which are secured one to each of the respective electrically conductive layers, or via a pair of electrically conductive clips which are attached on to each of the respective electrically conductive layers.
• connection tabs 24 or 64 comprises connecting terminals 26, 28 and 66, 68, respectively, which are arranged at the ends of the respective connecting tabs 24 and 64.
• Each of the connecting terminals 26 and 28 is connected to a respective one of the front and back electrically conductive layers of the electroluminescent panel 20; and, likewise, each of the connecting terminals 66 and 68 is connected to a respective one of the front and back electrically conductive layers of the electroluminescent panel 60.
• the connecting terminals are arranged for electrical connection to a respective one of the electrical prongs 16, such as via wires 30 shown in Figure 4; or via wires 30 through an electronic control circuit 70 and then via wires or circuit-board paths 72 to electrical prongs 16, as shown in Figure 10.
• the electronic control circuit 70 may be such as to provide electrical power of a different voltage than household AC voltage, or to provide a defined wave shape to the electroluminescent panel 60 (or 20), or to provide an electromechanical on/off switch, or to provide an electro-optical "daytime off switch or other such common light control functions.
• the particulars of such an electronic control circuit 70, if used, are beyond the scope of the present invention.
• the respective connection tab 24 or 64 is curved or folded from the respective side edge 22 or 62 of the respective electroluminescent panel 20 or 60, so as to extend behind the electroluminescent panel 20 or 60 into the enclosed volume. Accordingly, as noted above, there is no risk of electrical shock hazard existing, with respect to access to the connecting terminals 26, 28 or 66, 68, because any access thereto can only be provided if the respective night light 10 or 50 has been removed from a wall receptacle.
• Each of the translucent front faces 14 and 54 has edges which terminate at the edges of the planar rear wall 12.
• front face 14 has side edge 34 which terminates at respective side edge 42, and opposed top and bottom edges 38 and 40 which terminate at opposed top and bottom edges 44 and 46 of the substantially planar rear face 12. Adjacent edges of the translucent front face 14 and the planar rear wall 12 are attached one to the other.
• edges 72, 74 and 76 are attached to the respective edges 42, 44 and 46, of the planar rear wall 12.
• the electrical prongs 16 are placed nearer the top of the respective embodiments than the centre. This may be required according to some electrical codes; so that, when an electroluminescent supplementary lighting device in keeping with the present invention is placed into the top outlet of a standard two outlet AC wall receptacle, the bottom outlet will be covered.
• the respective electroluminescent panels 20 or 60 will protrude forwardly away from their respective side edges 22 or 62 so as to be contiguous to at least a major portion of the translucent front face 14 or 54.
• the electroluminescent panels 20 or 60 are not, themselves, necessarily attached in place. Rather, their three-dimensional configuration and the elastic or spring memory of the materials which comprise electroluminescent panels 20 and 60, can assure that they remain in place within the enclosed volume and proximate the respective front face 14 or 54.
• the curve is typically from side-to-side, but might be from top-to-bottom.
• the curved electroluminescent panel is placed behind the curved translucent front face 14; it being noted that the construction of most commercially available electroluminescent panels is such that a gentle curve may be imposed in them. Also, the construction of commercially available electroluminescent panels is such that they may be benl in a relatively tight radius so as to configure the connection tabs 24 or 64 without destroying the electrical continuity of either of the electrically conductive front or back sheets thereof.
• FIG. 1 through 4 will also comprise top and bottom portions 18 and 19, so that the enclosed volume within the embodiment 10 is defined as being behind the curved front face 14 and in front of the planar rear face 12, and between the top and bottom cover portions 18 and 19.
• the top and bottom cover portions 18 and 19 are opaque, s ⁇ that light emitted from the embodiment 10 is emitted through the curved translucent front face 14 only.
• those portions 18 and 19 may also each comprise an electroluminescent panel, so that nearly the entire structure forward of the substantially planar rear face 12 exhibits electroluminesence.
• the translucent face 54 comprises a rectangular top surface facet 80, and also four side surface facets 82, 84, 86, and 88 which slope downwardly - that is, rearwardly - from the rectangular top surface 80.
• Each of the side surfaces 82, 84, 86, 88 terminates at one of the pair of respective side edges 72, or at one of the pair of opposed top and bottom edges 74 and 76.
• the electroluminescent panel 60 is also configured as a truncated pyramid, as can be seen particularly in Figures 7, 9, and 10. It also comprises a rectangular top surface facet 90 and four side surface facets 92, 94, 96, 98, which slope downwardly - that is, rearwardly - when in place as shown in Figure 7, from the top surface 90. Each of the side surface facets 92, 94, 96, 98, terminates at a respective side edge or one of pair of opposed top and bottom edges 63, 67, and 62, 65, respectively.
• each of the side surfaces of the electroluminescent panel 60 has a trapezoidal shape which has a base at one of edges 62, 63, 65, or 67, and a pai oftrapezoid edges 71 , 73, and a top ends 75.
• a trapezoidal shape which has a base at one of edges 62, 63, 65, or 67, and a pai oftrapezoid edges 71 , 73, and a top ends 75.
• there is electrical continuity at the top edges 75 of each of the side surfaces 92, 94, 96, 98 with the top surface facet 90 and thus, when power is applied to the electroluminescent panel through the connecting terminals 66 and 68, each facet will be light emitting.
• Another embodiment of the truncated pyramid configuration of the electroluminescent panel 60 of the present invention takes advantage of the fact that, if the front and back electrically conductive layers of the electroluminescent panel are each covered with an insulative layer, then one of the pair of trapezoid edges 71 or each of the side surface facets 92, 94, 96, 98 will slightly overlie the opposite trapezoid edge 73 of an adjacent one of the four side surface facets 92, 94, 96, 98. Of course, it may be that sides 73 will overlie sides 71.
• the top surface facets 80 and 90 of the translucent front face 54 and the electroluminescent panel 60, respectively, are square.
• the size of the electroluminescent panel 60 is such that, when it is placed in the embodiment 50, the electroluminescent panel 60 will fit snugly to the inside surface of the translucent front face 54, as seen in Figure 7.
• the embodiment 31 shown in Figures 1 1 and 12 is that of a partial conical configuration, in which the translucent front face 14 is configured so as to curve forwardly in such a manner that the radius of curvature of the curved shape at one of the upper and lower edges 38 and 40 is different from the radius of curvature at the other of said upper and lower edges 38 and 40, so as to define a partial, truncated conic enclosed volume forward of said substantially planar rear wall, behind said curved translucent front face.
• electroluminescent supplementary lighting device which has three-dimensional configurations, and several such configurations have been shown in detail. Other amendments to the three-dimensional configurations may be made, without departing from the spirit and scope of the accompanying claims.

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• 2002
  • 2002-04-23 WO PCT/CA2002/000564 patent/WO2002089533A1/en not_active Application Discontinuation
  • 2002-04-23 CA CA002449988A patent/CA2449988A1/en not_active Abandoned
  • 2002-04-23 EP EP02766577A patent/EP1407637A1/de not_active Withdrawn

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