Accurate placement and retention of an amalgam in an...

Details Accurate placement and retention of an amalgam in an... Accurate placement and retention of an amalgam in an...

H - Electricity

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J

H01J 65/00 (2006.01) H01J 7/22 (2006.01) H01J 9/00 (2006.01) H01J 9/24 (2006.01) H01J 9/395 (2006.01) H01J 61/28 (2006.01) H01J 61/42 (2006.01) H01J 65/04 (2006.01)

Patent

CA 2133509

ACCURATE PLACEMENT AND RETENTION OF AN AMALGAM IN AN ELECTRODELESS FLUORESCENT LAMP Abstract An amalgam is accurately placed and retained in an optimized location in the exhaust tube of an electrodeless SEF lamp for operation at a mercury vapor pressure in the optimum range from approximately four to seven millitorr by forming a dimple in the exhaust tube and using a dose locating member to locate and retain the amalgam on the side of the dimple away from the core of the lamp after filling the lamp. As an alternative, two dimples may be situated on opposite sides of the exhaust tube for performing the same function as, but with less depth than, the single dimple. In another alternative embodiment, first and second dimple configurations are formed in the exhaust tube after tip-off thereof, each dimple configuration including either one or two dimples. The second dimple configuration is spaced apart from the first dimple configuration along the length of the exhaust tube. In this way, the amalgam may be initially positioned farther from the tip-off region, thereby avoiding problems during tipping off of the exhaust tube, such as loss of mercury from the lamp, or quenching of the tip-which could cause stress cracks. After tip-off, the second dimple configuration allows for placement of the amalgam closer to, or preferably in contact with, the tip of the sealed exhaust tube, i.e., the coolest location in the exhaust tube.

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