Illumination – Elongated source light unit or support – With means to position plural light sources colinearly
Patent
1989-11-30
1993-11-09
Lazarus, Ira S.
Illumination
Elongated source light unit or support
With means to position plural light sources colinearly
362226, 362249, 439239, 439698, F21S 300
Patent
active
052608590
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a lighting unit comprising double ended tubular lamps arranged in a row, an angle strip with two limbs arranged at an angle (.alpha.) to each other, conducting tracks, which are applied to at least one limb and respectively extend continuously in the longitudinal direction of the angle strips, and electrically conducting double ended tubular lamp holding elements, which are secured to the inner faces of the limbs by means of rivet joints, the rivet joints at the same time serving for the electrical connection between the respective conducting tracks and the holding elements and the holding elements have holes, in which the conically tapering contact ends of the double ended tubular lamps are held in place with the simultaneous supply of power thereto.
A lighting unit of this type has for example been described in the Swiss patent 599,501. For each double ended tubular lamp there are two respective holding elements, that is to say one for each end of the double ended tubular lamps and between such holding elements the double ended tubular lamps are fitted. Respectively adjacent holding elements are in this respect secured to different limbs of the angle strip. Thus, for each double ended tubular lamp it is necessary to have two holding elements, which have to be secured to the conducting tracks. In this case the conducting tracks are secured to the inner face of the limbs, that is to say directly adjacent to the double ended tubular lamps so that the latter heat up to a relatively high temperature owing to convention or radiation. The limbs, on which the conducting tracks are attached, are fashioned of a nonconducting, electrically insulating material, as for example plastic, whose thermal conductivity is very low so that the temperature, to which the metallic conducting tracks are heated, is only a little under the temperature of the double ended tubular lamps. Owing to the substantially different coefficients of thermal expansion of the metallic conducting tracks and of the insulating material of the limbs, to which the conducting tracks are rigidly secured, powerful mechanical stresses result, which cause a corrugation and warping of the lighting unit or may even result in fracture thereof. There is also the possibility of fracture of the connection between the metallic conducting track and the insulating limb material. At any event, the lighting unit is thermally instable owing to the heating effects, this more particularly being a reason for a substantial reduction in the reliability and working life of this known lighting unit.
Furthermore the patent publications WO-A-85/05433 and EP-A-0 126 023 describe lighting units in the form of an angle strip with double ended tubular lamps in the case of which again two respective holding elements are provided for each one double ended tubular lamps. The holding elements are in this case made integral with the conducting tracks, the holding elements being split off from the conducting tracks. The conducting track is in each case laid on the outer sides of the limbs and the holding elements project though a respective corresponding hole into the cavity inside the lighting unit. One disadvantage of this lighting unit is that the conducting tracks have their cross section considerably reduced where the holding elements are split off from the material of the conducting track. This means that the lighting unit may only be operated with a low amperage, this being more specially a considerable disadvantage since such lighting units are normally operated at a low voltage and in order to obtain sufficient wattage heavy amperages have to be used. Furthermore, in the case of the known lighting units it is a disadvantage that there are difficulties as regards adaptation to double ended tubular lamps with different lengths or diameters. For each type of double ended tubular lamp it is necessary to use special tools both for the production of the conducting tracks and also for the production of the angle strip in order to provide the conducting track
REFERENCES:
patent: 2298824 (1942-10-01), Darley
patent: 4158221 (1979-06-01), Agabekov
patent: 4521838 (1985-06-01), Agabekov
patent: 4723199 (1988-02-01), Freed et al.
patent: 4874320 (1989-10-01), Freed et al.
patent: 5027262 (1991-06-01), Freed
Heyman L.
Lazarus Ira S.
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