H - Electricity – 01 – J
Patent
H - Electricity
01
J
H01J 61/02 (2006.01) H01J 1/92 (2006.01)
Patent
CA 2527404
Arc discharge lamp (10) has a longitudinal axis (12) with an arc tube (14) having a hollow body (16) containing an arc generating and sustaining medium aligned with the axis. The arc tube (14) can be formed of a ceramic material, such as alumina. Electrodes (18) and (20) extend into the hollow body (16), one from each end of the arc tub. The electrodes (18) and (20) and the hollow body (16) are arrayed along the longitudinal axis (12). A sealed shroud (22) surrounds the arc tube and can be evacuated or provided with an inert atmosphere. The shroud (22) and the arc tube (14) form an arc tube assembly (24). A lamp envelope (26) surrounds the arc tube assembly (24), and the envelope includes a base portion (28) including at least one cylindrical part (30). Electrical lead-ins (32, 34) extend through the base portion (28) and mechanically and electrically connect to the arc tube electrodes (18) and (20), as by welding. A strengthening member (36) for preventing the arc tube assembly (24) from displacement from the longitudinal axis (12) as a result of forces applied in a direction substantially normal to the axis (12) is provided within the lamp. The strengthening member (36) comprises an elongated element (38) having first and second ends, (40, 42) respectively. The first end (40) is formed to substantially engage the arc tube assembly (24), near its upper end, and the second end (42) is formed to substantially engage the base portion (28) of the arc lamp (10).
Collins Steven
Hrubowchak David
Oberlies Paul
Wark Graham
Fetherstonhaugh & Co.
Osram Sylvania Inc.
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