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Amalgam system for increased temperatures

IP.com Disclosure Number: IPCOM000021939D
Publication Date: 2004-Feb-17
Document File: 3 page(s) / 258K

Publishing Venue

The IP.com Prior Art Database

Abstract

ID697692

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Amalgam system for increased temperatures

In many fluorescent lamps a glass capsule, fixed on the anode shield is used to dose Hg in the lamp. In order to dose an amalgam in a high loaded lamp it is proposed to use such a glass capsule dosing system on the anode shield, to store this amalgam. Because the anode shield temperature is >200 °C, the Hg pressure above e.g. the BiIn amalgam will rise to values higher than 100 Pa in this situation. In order to optimize the Hg pressure to 1 Pa, the Hg content of the amalgam must be drastically reduced. The latter can lead to a lack of Hg during the lifetime of the burner. An improved way to optimize the Hg pressure is to adapt the length of the glass capsule to tune the amalgam temperature, which requires a slighter reduction of the Hg contents. By adapting the length of the glass capsule to a certain temperature area, the high temperature amalgam Bi57.5Sn38.5Pb4 w/o could be used leading to a broad delta T90. An additional advantage is that the proposed system will rise fast in temperature.

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