FR2557359A1 - CUP FOR LOW PRESSURE DISCHARGE LAMP - Google Patents

Abstract

THE INVENTION RELATES TO A BASE FOR A LOW PRESSURE DISCHARGE LAMP. LEDIT SOCKET 4 CONSISTS OF A SOCKET5 IN AN INSULATING MATERIAL AND CONTACTS6 INCORPORATED IN THIS SOCKET. AN ELECTRICALLY CONDUCTIVE LAYER9 IS APPLIED TO THE INTERNAL FACE OF THE SOCKET 5 WALL TO IMPROVE PRIMING AT LOW TEMPERATURES. APPLICATION TO LOW PRESSURE DISCHARGE LAMPS.

Description

The present invention relates to a base equipping a discharge lamp

  at low pressure to one-side pelletization, this base being constituted by a socket made of an insulating material, as well as by contacts incorporated in said socket. The invention has been object in lamps of the aforementioned type and in particular in compact fluorescent lamps, of

  guarantee an irreproachable priming even at low temperatures.

  tures. For this purpose, the inner face of the base wall is coated with an electrically conductive layer, made in particular of aluminum. It proved to be advantageous

  to use an aluminum adhesive tape, which can also be

  be applied inexpensively.

  The above measure is appropriate for different types

  low-pressure discharge lamps with one-sided pelletization.

  For example, such lamps may have a single closed discharge compartment (for example U-bent or composed of several U-shaped parts respectively), or may comprise one or more closed discharge compartments and placed in an ampoule. As explained below in more detail in support of the exemplary embodiment described with reference to a drawing, a lamp of another type includes one or

  several open discharge compartments, housed in a bulb.

  The invention will now be described in more detail by way of non-limiting example, with reference to the accompanying drawings in which the single figure is an elevation with partial section of a low-pressure discharge lamp with a pelletization

on one side.

  The compact fluorescent lamp 1 shown is composed of two discharge compartments 2a and 2b which are bent in a U-shape, are open on one side and are incorporated in a bulb 3. These compartments 2a and 2b are pinched at a respective end, while the ampoule 3 is closed by means of a sealed disc. A pellet 4 is attached to this

lower region of the bulb.

  The base 4 consists of a plastic sleeve 5

  in which are incorporated contacts 6 which, via supply conductors 7, are electrically conductive connection with electrodes 8 of the

lamp 1.

  An adhesive strip 9 made of aluminum is applied to the inner face of the wall of the socket S of the base, the material

  plastic which can remain clear for 2 to 3 mm at the top edge

  of said sleeve-5. It is in this region that a putty 10 is deposited by means of which the base 4 is fixed to the bulb. Advantageously, the aluminum adhesive strip extends substantially beyond the vicinity of the inclusion.

sealed electrodes.

  It goes without saying that many modifications can be made to the cap described and shown without departing from the scope

of the invention.

RE \ Indications

  1. Cap fitted to a low-pressure discharge lamp

  one side, and provided with a sleeve in one

  insulating material and contacts incorporated in this socket, characterized by the fact that the inner face of the wall of said socket (S) is coated with an electrical layer.

triply conductive.

  2. Base according to claim 1, characterized in that the layer (9) electrically conductive consists of

of aluminum.

  3. Base according to claim 2, characterized in that the aluminum layer is an adhesive strip (9) of aluminum.