FR2557357A1 - INTERMEDIATE ASSEMBLY FOR A DISCHARGE LAMP WITH A SINGLE SIDE - Google Patents

Abstract

THE INVENTION CONCERNS AN INTERMEDIATE BASE FOR A SINGLE SIDED DISCHARGE LAMP. LEDIT INTERMEDIATE BASE4 EQUIPPED WITH A DISCHARGE LAMP1 AND IT CONTAINS AN ELECTRONIC BALLAST5 OF THIS LAMP. ON ITS FACE TURNED TOWARDS THE LAMP1, THIS CULOT4 IS COATED WITH A THERMOREFLECHISSANTE7 LAYER TO PROTECT THE ELECTRONIC COMPONENTS FROM ADDITIONAL HEATING. APPLICATION TO DISCHARGE LAMPS.

Description

Z557357

  The present invention relates to an intermedia-

  re equipping a discharge lamp to culotace on one side.

  This intermediate base houses electrical components.

  It is well known that discharge lamps must be provided with a choke or priming element to turn on the lamp, as well as a ballast to limit the current of this lamp. So far, these electrical components

  have been housed in luminaires - especially

  for lamps of this type. In particular in the case

  of compact fluorescent lamps, the new trend in

  incorporate the priming element and the ballast into the lamp base or into a room

  which constitutes an intermediate base (also

  "Adapter"). Another evolutionary step is to use what is called ballast.electronics instead of ds. conventional induction coils or similar electromagnetic elements. In these devices, the voltage of the SO Hz network is generally converted into a high frequency voltage between 30 kHz and 50 kHz. The limitation of the current is then also ensured by an induction coil, laquoelle

  can however be very small because of the high frequency.

  However, the components used in these devices are very sensitive to heat. Even if the heat generated by the ballast itself is very small.

  this appliance must be incorporated in a closed space

  inside the base or the intermediate base, which aims to

  avoid any additional heating from the outside,

to say caused by the lamp.

  The object of the invention is to protect the electronic components which are in the

casing of the intermediate base.

  According to the invention, this object is achieved by the fact that the intermediate cap is provided on its face

  turned towards the lamp, a layer reflecting the

  ments. This layer is particularly heat reflective, so that the heat given by the lamp does not heat the electronic components in addition to the heat released by

these components themselves.

  It has proved advantageous to make the intermediate pellet

  of a heat-resistant plastic material, for example

  For example, polyprobutylene terephthalate

  diary being coated, at the locations provided for this purpose, the thermoreflective layer consisting for example of aluminum, aluminum oxide or titanium oxide. This layer can be properly deposited by

  spraying spray or electrostatically.

  The material constituting said layer is electrically

non-conducting

  The invention will now be described in more detail by way of non-limiting example, with reference to the drawing.

  annexed in which the single figure is a fragmen-

  partially cut off a compact fluorescent lamp

  whose intermediate base contains a ballast.

  The compact fluorescent lamp 1 illustrated in the figure comprises a bulb 2 and a base 3 mounted rigidly on this bulb. The lamp 1 is equipped with a removable intermediate base 4 in which there is an electronic ballast 5, and to which is attached a threaded end 6 which connects the lamp 1 to a conventional socket for

incandescent lamps.

  To protect this electronic ballast-

  heating too intense, the face of the intermediate base 4 turned towards the lamp 1 is coated with a layer

  of aluminum 7 which is in particular heat reflective.

  It goes without saying that many modifications can be made to the intermediate cap described and shown,

  without departing from the scope of the invention.

Claims (4)

  1. Intermediate cap equipping a untm single-sided discharge lamp with electrical components housed   in this intermediate base, characterized by the fact that   said base (4) is provided on its side facing the lamp (1), a layer (7) reflecting the radiation.   2. Intermediate cap according to claim 1, characterized   terized by the fact that the layer (7) reflecting the   In particular, it is thermoreflective.   3. Intermediate cap according to claim 2, characterized   characterized in that the heat-reflecting layer (7)   consists of a metallic material.   4. Intermediate cap according to claim 2, characterized   characterized in that the heat-reflecting layer (7)   consists of an electrically non-conductive material.