Abstract:
A coupling component has a groove for receiving a rim of a mouth portion of a lighting body protection bulb. The groove includes sculptured formations to keep the mouth portion rim received in the groove spaced from the bottom of the groove to produce a discontinuous contact between the mouth portion rim and the groove.

Description:
RELATED APPLICATIONS 
     The present application is a national stage entry according to 35 U.S.C. §371 of PCT application No.: PCT/EP2010/063678 filed on Sep. 17, 2010, which claims priority from Italian application no. TO2009A000725 filed on Sep. 23, 2009. 
     TECHNICAL FIELD 
     Various embodiments relate to lighting devices of the integrated type including a light source, such as a halogen lamp, and a corresponding power supply circuit such as an electric transformer. 
     BACKGROUND 
       FIG. 1  shows schematically, by way of example, a lighting device  10  comprising:
         a light source  12  and   a corresponding electrical power supply circuit  14 .       

     The light source can comprise a lighting body (or “burner”) which may be, for example, a halogen lamp  120  intended to reach temperatures of about 200° C. during operation. Consequently, while it is normally provided with its own bulb, of teardrop shape for example, the lamp  120  can be placed inside a bulb  122  made from transparent material (such as glass) which is intended to ensure that the flow of light is not impeded, while also preventing any undesired accidental contact with the lighting body  120  at its operating temperature. 
     The joint or connection to the housing containing the electrical power supply circuit  14  is made by means of a joining element  20  generally referred to as “tape”. 
     To ensure that the heat originating from the light source  12  (in other words, from the lighting body  120 ) does not degrade the properties of the component  20 , this component is made from materials which combine the properties of heat-resistance and stability (such as glass, ceramic materials or metals). However, these materials can give rise to problems in respect of weight, cost and low mechanical strength (for example, materials such as glass or ceramics have an intrinsically low resistance to impact), and are also difficult to model or mold. If plastics or resin materials are used, this may give rise to the release of chemical substances which can be deposited on the bulb  122 , which, on the one hand, reduces the transparency of the bulb, impeding the diffusion of the light flux, and, on the other hand, imparts a stained appearance to the bulb, with negative results in terms of its visual appeal. 
     SUMMARY 
     The inventors have discovered that, in order to produce the component in question, it is necessary to provide solutions which can replace materials such as glass, ceramic materials or metal, and which are lighter, more economical and stronger in mechanical terms, while also being easier to model or mold because they are made from a material with excellent thermal insulation properties, such as plastics material, which can be used without giving rise to the other drawbacks described above. 
     The claims form an integral part of the technical teachings provided herein in relation to the invention. 
     Various embodiments can provide a very simple solution which has no appreciable effect on the production of the housing of an integrated lighting device. 
     Various embodiments can provide a compact solution which has no effect on the lighting device and which allows the lighting device to be given an appearance which is identical or at least very similar to that of a conventional bulb lamp. 
     Various embodiments also provide a good circulation of air between the external environment and the interior of the bulb, thus simultaneously reducing the temperature inside the bulb and allowing the exit of any chemical particles diffused inside the bulb, while also making it possible to provide the minimum safety distances and prevent any contact with the “live” parts of the lighting device by a correct design of the shape of the housing. 
    
    
     
       BRIEF DESCRIPTION OF THE APPENDED DRAWINGS 
       In the drawings, like reference characters generally refer to the same parts throughout different views. The drawings, are not necessarily to scale, emphasis instead being generally upon illustrating the principles of the invention. In the following description, various embodiments are described with reference to the following drawings, in which: 
         FIG. 1  has been described above, 
         FIG. 2  shows the position of the element considered herein within the device of  FIG. 1 , 
         FIG. 3  shows a component according to one embodiment, considered separately, 
         FIGS. 4 ,  5  and  6  show different modes of operation of embodiments, and 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     The following description refers to the accompanying drawings that show, by way of illustration, specific details and embodiments in which the invention may be practiced. 
     The reference to “an embodiment” in this description is intended to indicate that a particular configuration, structure or characteristic described in relation to the embodiment is included in at least one embodiment. Therefore, phrases such as “in an embodiment”, which may be present in various parts of this description, do not necessarily refer to the same embodiment. Furthermore, specific formations, structures or characteristics may be combined in a suitable way in one or more embodiments. 
     The references used herein are purely for convenience and therefore do not define the scope of protection or the extent of the embodiments. 
       FIG. 2  shows in greater detail the structure of the light source  12  described previously with reference to  FIG. 1 . 
     As stated previously, the light source  12  comprises a lighting body proper  120  (such as a halogen lamp, also called a “burner”) surrounded by a bulb  122  of approximately spherical or bulb-like shape with an overall tray-like or cup-like structure (which appears inverted in the view shown in  FIG. 2 ). The bulb  122  also has a mouth rim  124  (which is circular in the embodiment illustrated herein) designed to be received in a peripheral groove  22  of the component (generally called a “tape”) indicated by  20  in  FIG. 1  which was described above. As can be seen more clearly in the view of  FIG. 3 , in the embodiment illustrated herein the component  20  is of generally disk-like shape with a bottom wall  202  of overall concave shape designed to define an area for the mounting of the lighting body  120  in a central position and therefore on the bottom part of the bowl formed by the wall  202 . 
     For example, two radial ribs  204  can extend upward from the bottom wall of the component  20  to permit the insertion, with a positive connection, of a two-piece plate  206  in the shape of an inverted tray, which carries the lighting body  120  in a central position. 
     The view of  FIG. 3  also shows that the groove  22  intended to receive the mouth rim  124  of the bulb  122  lies between two annular walls, namely:
         an “outer” annular wall  208 , defining the external profile of the general disk-like configuration of the component  20 , and   an “inner” annular wall  210 , which delimits peripherally the central part of the bottom wall  202  of the component  20 . Between the two annular walls  208  and  210  there are radial ribs  212  forming raised (or more generally “sculptured”) formations in relation to the bottom of the groove  22 . Because of the presence of these formations  212 , the coupling of the bulb  122  to the component  20  by the insertion of its mouth rim  124  into the groove  22  does not create any continuous contact between the mouth rim  124  and the bottom of the groove  22 . In other words, the formations  212  help to keep the mouth rim  124  of the bulb  122  slightly “elevated” above the bottom of the groove  22 , thus ensuring that the contact between the mouth rim  124  and the body of the component  20  is actually a discontinuous contact, which is, for example, capable of allowing a certain amount of air to flow between the mouth rim  124  of the bulb  122  and the peripheral edge of the component  20 .       

     The reference  214  also indicates a set of openings provided in the bottom wall  202  of the component  20  such that a further flow of air is permitted between the external environment and the interior of the bulb  122 . 
     As can be seen more clearly in the views of  FIGS. 5 and 6 , in various embodiments, the mouth rim  124  of the bulb  122  is inserted into the groove  22  and, because of the presence of the ribs  212 , this insertion does not create a sealed connection but allows a degree of circulation of air in the internal environment of the bulb, such that the temperature inside the bulb can be reduced, and at the same time any chemical particles which have diffused into the bulb can pass out of it. 
     Thus a form of labyrinth is created between the parts concerned, this labyrinth allowing a flow of air but also meeting the requirements of electrical insulation in terms of creepage and clearance. 
     In various embodiments, the component  20  makes it possible to overcome the problems related to the high temperature of the lighting body  120  and to the fact that, when inserted into the bulb  122 , the lighting body  120  is not directly exposed to the external environment and is therefore not directly ventilated. 
     As stated above, the component  20  can support the plate composed of two complementary portions  206  of semicircular shape, which also provide an electrical connection between the lighting body  120  and the other parts of the device  10 , for example by means of edge portions bent to lie behind the inner face of the wall  210 . In particular, the electrical connection can be made by means of blade contact elements as described in a patent application for an industrial invention filed on the same date by the present applicant. 
     In various embodiments, the component  20  is made from a plastics material with properties of high heat-resistance, for example the material known as LCP. 
     The component  20 , and particularly the bottom wall  202 , is also suitable for forming the mechanical connection with the power supply circuit  14  using a solution in which a separating air gap is formed as described in another patent application for an industrial invention filed on the same date by the present applicant. 
     The bulb  122  can be fixed to the component  20  by gluing or simply by means of a mechanical friction fit. 
     While the invention has been particularly shown and described with reference to specific embodiments, it should be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is thus indicated by the appended claims and all changes which come within the meaning and range of equivalency if the claims are therefore intended to be embraced.