Low-pressure mercury-vapor discharge lamp, and method of placing mercury therein
First Claim
Patent Images
1. Low-pressure mercury-vapor discharge lamp havinga discharge vessel (1);
- a pumping tube (3) sealed into the discharge vessel, extending externally of, and internally into the discharge vessel, said pumping tube defining a lumen and having an inner end (4) which is open and located interiorily of said discharge vessel (1); and
mercury (Hg), in metallic Hg form or as an amalgam, located within said pumping tube (3),wherein, in accordance with the invention,the lumen of the open inner end (4) is reduced, or constricted with respect to the lumen of the remainder of the pumping tube to form an end portion of reduced lumen at said open inner end; and
wherein, in addition to said mercury or amalgam, a solid body (6, 11,
15) is located within the pumping tube (3), said solid body being dimensioned and shaped to partly close off the open inner end (4) of the pumping tube, and prevent escape of the solid body from the pumping tube, and hence escape of non-vaporized mercury from the end (4) of reduced, or constricted lumen of the pumping tube.
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Abstract
A low-pressure mercury-vapor discharge lamp, which is equipped with Hg or amalgam, has a pumping tube opening (4) with constricted cross-section or lumen. A solid body in the pumping tube (3) prevents the mercury from emerging into the discharge space. At the same time, the particular shape of the constriction and of the solid body, respectively, makes it possible for Hg vapor to diffuse through-passages between the pumping tube and the solid body into discharge vessel.
26 Citations
23 Claims
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1. Low-pressure mercury-vapor discharge lamp having
a discharge vessel (1); -
a pumping tube (3) sealed into the discharge vessel, extending externally of, and internally into the discharge vessel, said pumping tube defining a lumen and having an inner end (4) which is open and located interiorily of said discharge vessel (1); and mercury (Hg), in metallic Hg form or as an amalgam, located within said pumping tube (3), wherein, in accordance with the invention, the lumen of the open inner end (4) is reduced, or constricted with respect to the lumen of the remainder of the pumping tube to form an end portion of reduced lumen at said open inner end; and wherein, in addition to said mercury or amalgam, a solid body (6, 11,
15) is located within the pumping tube (3), said solid body being dimensioned and shaped to partly close off the open inner end (4) of the pumping tube, and prevent escape of the solid body from the pumping tube, and hence escape of non-vaporized mercury from the end (4) of reduced, or constricted lumen of the pumping tube. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification