Koninklijke Philips Corporation N.V.

Roland Blasig

Simon Krijnen

Olaf Mastenbroek

Ingrid Jozef Maria Snijkers-Hendrickx

Leonie Maria Geerdinck

Engelbertus Cornelius Petrus Maria Vossen

Adrianus Johannes Hendricus Petrus Van Der Pol

Ronald Arjan Van Den Brakel

Theodorus Herman Ketelaar

A low-pressure mercury vapor discharge lamp has a lamp envelope enclosing, in a gastight manner, a discharge space provided with a filling of mercury and a rare gas. The lamp envelope includes electrodes for maintaining a discharge in the discharge space. The lamp envelope transmits UV-light and is made of a black glass component. The composition of the black glass component is free of PbO and comprises, expressed as a percentage by weight, the following constituents: 65-70% by weight of SiO, 1.4-2.2% by weight of LiO, 1.5-2.5% by weight of NaO, 11-13% by weight of KO, 1.8-2.6% by weight of MgO, 2.5-5% by weight of CaO, 2-3.5% by weight of SrO, 8-9.5% by weight of BaO, 0.2-0.4% by weight of CoO, and 1.7-3.25% by weight of NiO.

Low-pressure mercury vapor discharge lamp and apparatus for treatment

The electric lamp has a glass component with a composition which, according to the invention, is substantially free of PbO and has the following constituents: 55&#x2013;70 wt. % SiO, &#x3c;0.1 weight % AlO, 0.5&#x2013;4 weight % LiO, 0.5&#x2013;3 weight % NaO, 10&#x2013;15 wt. % KO, 0&#x2013;3 wt. % MgO, 0&#x2013;4 wt. % CaO, 0.5&#x2013;5 wt. % SrO, 7&#x2013;10 wt. % BaO. Preferably, the composition of the glass comprises: 65&#x2013;70 wt. % SiO, 1.4&#x2013;2.2 wt. % LiO, 1.5&#x2013;2.5 wt. % NaO, 11&#x2013;12.3 wt. % KO, 1.8&#x2013;2.6 wt. % MgO, 2.5&#x2013;5 wt. % CaO, 2&#x2013;3.5 wt. % SrO, 8&#x2013;9.5 wt. % BaO. The glass is preferably used as a CFL-envelope glass or as glass for a stem. The electric lamp made with a glass according to the invention has favorable fusion and processing properties, in particular a liquidus temperature T&#x2266;800&#xb0; C.

Electric lamp comprising a lead-free glass component

Low-pressure mercury vapor discharge lamp has an at least partly substantially cylindrical discharge vessel () with a length Ldv and with an internal diameter Din. The discharge vessel () encloses, in a gastight manner, a discharge space () provided with a inert gas mixture and with mercury. The discharge vessel () comprises discharge means (electrodes) for maintaining a discharge in the discharge space (). According to the invention, the ratio of the weight of mercury mHg in the discharge vessel () to the product of the internal diameterDin and the length of the discharge vessel Ldv is given by the relation: wherein C (0.01 (g/mm2. Preferably, 0.0005 (C(0.005(g/mm2. Preferably, the discharge vessel () contains less than 0.1 mg mercury. The discharge lamp according to the invention operates under unsaturated mercury conditions.

Low-pressure mercury vapor discharge lamp

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Aachen, Germany

Roland Blasig