Method of manufacturing a low-pressure mercury vapour dischar.

摘要

A method of manufacturing a low-pressure merucury vapour discharge lamp comprising a discharge tube (1), to the inner wall of which is applied a layer of luminescent material (4) by means of a suspension of the luminescent material, which suspension is brought into contact with this inner wall in such a manner that a layer of suspension adheres thereto, the non-adhered suspension disappearing from the tube, afterwhichthe layer is dried by heating a zone (14) of this layer extending along the tube circumference by means of a high-frequency electric field which from a starting point near the upper end ofthetube performs such a movement with respect to the tube that the zone moves towards the lower end of the tube.