H - Electricity – 01 – J
Patent
H - Electricity
01
J
313/80
H01J 61/33 (2006.01) H01J 61/32 (2006.01)
Patent
CA 1128108
1 PHN 9030 ABSTRACT: Low-pressure mercury vapour dis- charge lamps of the fluorescent type are known which com- prise two nesting glass members so grooved as to provide between their nesting surfaces a circuitous ("folded") discharge path between two electrodes, the length of the discharge path being considerably greater than the physi- cal distance between the electrodes. The whole surface of each glass member is coated with luminescent material with the result that, when the lamp is in use, the portions of the members not surrounding the discharge appear dark due to their poor light transmissibility. According to the invention, these portions of the two members are not coated with luminescent material and thus act as windows for light generated in the luminescent layers facing the lamp axis. Preferably, a fluted reflector is provided inside the lamp.
321229
Roelofs Hendrik
Van Bommel Cornelis H.m.
Wesselink Gustaaf A.
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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