Low-pressure mercury discharge lamp having mercury capsule with

Details Low-pressure mercury discharge lamp having mercury capsule with Low-pressure mercury discharge lamp having mercury capsule with

1996-10-29

1999-06-29

O'Shea, Sandra

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313546, 313564, 313565, 313566, H01J 162, H01J 6304, H01J 1722, H01J 1970

Patent

active

059172762

ABSTRACT:
In a method according to the invention, a capsule (20) having a glass wall (21) and containing mercury is positioned in a radiation-transmitting discharge vessel, after which the discharge vessel is provided with a rare gas and closed, means for maintaining an electric discharge are arranged in or adjacent the discharge vessel, and the capsule is opened by fusion after the discharge vessel has been closed in that the capsule is heated by irradiation (42) with a parallel beam of radiation through the wall of the discharge vessel. The wall of the capsule has for this radiation an absorption coefficient which amounts at least ten times that of the wall portion of the discharge vessel. The method according to the invention renders possible a comparatively simple lamp construction.
A low-pressure mercury discharge lamp is provided with a radiation-transmitting discharge vessel (10) which is closed in a gastight manner and has an ionizable filling comprising mercury, while a capsule (20) with a glass wall (21) having an opening (24) is arranged in the discharge vessel, and the lamp is in addition provided with means (31A, 31B) for maintaining an electric discharge in a discharge space (13) surrounded by the discharge vessel. The capsule (20) is accessible to radiation of at least a wavelength lying in a range from 100 nm to 5 .mu.m from outside the discharge vessel (10) through a wall portion (11) thereof, and the wall (21) of the capsule (20) has an absorption coefficient for this radiation which amounts at least ten times that of the wall portion (11) of the discharge vessel.

REFERENCES:
patent: 3684345 (1972-08-01), Schlekel et al.
patent: 3913999 (1975-10-01), Clarke
patent: 4278908 (1981-07-01), Antonis
patent: 4823047 (1989-04-01), Holmes et al.
patent: 4907998 (1990-03-01), Kuijer et al.
patent: 5006755 (1991-04-01), Wittmann et al.
patent: 5374871 (1994-12-01), Johnson
patent: 5387837 (1995-02-01), Roelevink et al.

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