Low-pressure mercury-vapor discharge lamp
AssigneeKoninklijke Philips Electronics N.V.
InventorsCornelis Johannes Maria Denissen, Cornelis Reinder Ronda, Volker Ulrich Weiler, Klaus Gawron
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Abstract
A low-pressure mercury-vapor discharge lamp has a discharge vessel with a filling of mercury and an inert gas. Electrodes in the discharge space have electrode shields, which operate at temperatures above 450° C. An inner surface of the electrode shield may have a heat-absorbing coating, for example a carbon film. The electrode shield may be supported by a support wire, at least a part of which is made from stainless steel. A lamp according to the invention has comparatively low mercury consumption.
Claims4
A low-pressure mercury-vapor discharge lamp comprising a discharge vessel,
- the discharge vessel enclosing a discharge space containing a filling of mercury and an inert gas in a gastight manner,
- electrodes being arranged in the discharge space for generating and maintaining a discharge in said discharge space,
- and an electrode shield at least substantially surrounding at least one of the electrodes,
- wherein, during nominal operation, the temperature of the electrode shield is above 450° C., and the electrode shield is provided, at a side facing the electrode with an absorbing coating for absorbing radiation.
A low-pressure mercury-vapor discharge lamp comprising a discharge vessel,
- the discharge vessel enclosing, in a gastight manner, a discharge space containing a filling of mercury and an inert gas,
- electrodes being arranged in the discharge space for generating and maintaining a discharge in said discharge space,
- and an electrode shield at least substantially surrounding at least one of the electrodes,
- wherein, during nominal operation, the temperature of the electrode shield (22a) is above 450° C., and supports the electrode shield and at least a section of the support wire is made from stainless steel, said section being connected with the electrode shield.
Dependencies are inferred from the claim text.