FR2557358A1 - CULOT FOR A DISCHARGE LAMP WITH A SINGLE SIDE - Google Patents

Abstract

THE INVENTION CONCERNS A BASE FOR A SINGLE SIDED DISCHARGE LAMP. LEDIT CULOT 4, HOUSING ELECTRONIC COMPONENTS, IS COATED WITH A THERMOREFLECHISSANTE9 LAYER ON ITS FACE TURNED TOWARDS BULB3 OF LAMP1, IN ORDER TO PROTECT SAID ELECTRONIC COMPONENTS FROM HEAT. APPLICATION TO FLUORESCENT LAMPS.

Description

The present invention relates to a base equipping a discharge lamp

  on one side. This pellet houses

electrical components.

  In a well-known manner, discharge lamps must be provided with a choke or priming element to light the lamp, as well as a ballast to limit the

  current of this lamp. Until now, these elec-

  were placed in special luminaires

  designed for lamps of this type. Recently, especially in the case of compact fluorescent lamps, the tendency is to incorporate the priming element and the ballast into the base of the lamp

  or in a separate room constituting an intermediate base.

  Another evolutionary step is to use so-called electronic ballasts instead of conventional induction coils or similar electromagnetic elements. In these devices, the 50 Hz mains voltage is usually transformed into a high frequency voltage

  from 30 kHz to 50 kHz. The limitation of the current is then equal

  provided by an induction coil, which may, however,

  to be very small because of the high frequency.

  Nevertheless, the components used in these devices are very sensitive to heat. Even if the heat generated by the ballast itself is very low, it must be housed 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 housed in the housing from overheating.

of the pellet.

  According to the invention, this object is achieved by the fact that the base is provided on its side facing the lamp, a reflective layer radiation. This layer is in particular 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 realize the pellet in

  heat resistant plastic material, for example

  polyprobutylene phthalate, this pellet being provided with

  places provided for this purpose, the heat reflecting layer

  such as aluminum, aluminum oxide,

  minium or titanium oxide. This layer can be adapted

  deposited by spraying, spraying or

electrostatically.

  This thermoreflective layer may consist of a

  electrically non-conductive material.

  Another problem, especially in the case of fluorescent lamps

  compact resellers, is raised by the light diffused towards the side of the base. To make the lamps, a long discharge tube is bent in some way so that it

  describes one or more meanders. In this way, it becomes suf-

  short to take the dimensions of an incandescent lamp-

  classical class. It follows, however, that a part of

  the scattered light is directed towards the base, on which it is most often wasted by absorption and

  by multiple reflection. This light is referred to

  the main radiation of the lamp by the partial reflection of the base. This confers the advantage of avoiding in the

  the widest measurement of light losses.

  The invention will now be described in more detail by way of non-limiting example, with reference to the drawing in which the single figure is a partial fragmentary elevation of a compact fluorescent lamp provided with a

ballast lodged in its base.

  The compact fluorescent lamp 1 shown in section in the figure comprises two discharge compartments 2a and 2b which are bent, open on one side and located in a bulb

  3, and a base 4 according to the invention.

  The base 4 consists of a hollow body 5 which annulably seals the lower part of the bulb 3, as well as an adjoining threaded end 6 making it possible to screw the entire lamp

  1 in a conventional socket for incandescent lamps.

  Electronic components 8, placed on a wafer

  7 in the hollow body 5 of the base 4, perform the functions of a priming device and ballast of

the lamp 1.

  S To protect these electronic components 8 from a

  their too intense, the face of the base 4 facing the bulb 3 is provided with a layer 9 of aluminum which is in particular heat reflective. Since this layer 9 also returns the visible light, we take advantage of this advantage to maintain the lowest possible loss of illumination. For this purpose, it is however necessary that a sealant 10, by means of which the bulb 3 is fixed in the base 4, cover not all the face facing said bulb 3, but only a minimum surface, as it

spring of the single figure.

  It goes without saying that many changes can be made to the cap described and shown, without going out of the box

of the invention.

Claims (4)

REVENDICATIGNS   A base fitted to a single-side-screwed discharge lamp with electrical components arranged in this base, characterized in that said base (4) is provided on its face facing the bulb (3), a layer (9) reflecting the radiation. 2. Base according to claim 1, characterized in that the layer (9) reflecting the radiation is   in particular heat reflective.   3. Base according to Claim 2, characterized in that the heat-reflecting layer (9) consists of a metallic material.   4. Base according to Claim 2, characterized in that the heat-reflecting layer (9) consists of a   electrically non-conductive material.