U.S. Philips Corporation

Albert Bouwknegt

Jean J Heuvelmans

Franciscus A Ligthart

Winston Donald Couwenberg

Petrus Cornelis Lauwerijssen

Jan Bloem

Low-pressure gas discharge lamp having a discharge vessel which comprises a plurality of parallel tubular portions which are interconnected in series by means of one or more coupling links engaging those portions substantially transversely, the discharge passing through the coupling link(s) and at least the major parts of the tubular portions during operation of the lamp, a coupling link engaging a tubular portion at a distance from one end of a tubular portion so that a cool spot is created in the lamp at that end.

Low pressure discharge lamp

Low-pressure mercury vapor discharge lamp having a relatively small discharge vessel containing as the buffer gas a rare gas mixture which is rich in helium, but which also comprises a quantity of one or more heavier rare gases, preferably crypton. The heavier rare gases increase the arc voltage.

Low-pressure mercury vapor discharge lamp

A low-pressure mercury vapor discharge lamp, having a discharge space containing thermally emitting electrodes and a mercury amalgam which is composed of mercury, bismuth, tin and lead. This amalgam causes the mercury vapor pressure to remain stable at the value of 6 .times. 10.sup.-3 torr which is the optimum value for the conversion of electric energy into ultraviolet radiation over a wide temperature range. In addition, the mercury vapor pressure at room temperature is still sufficiently high to ensure rapid starting.

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Eindhoven, Netherlands

Albert Bouwknegt