GLASS TUBE FOR EXTERNAL ELECTRODE FLUORESCENT LAMP

An envelope used for producing an external electrode fluorescent lamp which has a structure wherein an electrode is formed on the external surface is characterized by being composed of a glass having a dielectric loss tangent of not more than 0.02 at 40 KHz and 250°C and a strain point of not more t...

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Bibliographische Detailangaben
1. Verfasser:	HIKATA, HAJIME
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BASIC ELECTRIC ELEMENTS CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS CHEMISTRY ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS ELECTRICITY GLASS JOINING GLASS TO GLASS OR OTHER MATERIALS METALLURGY MINERAL OR SLAG WOOL SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS SURFACE TREATMENT OF GLASS
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Beschreibung
Zusammenfassung:	An envelope used for producing an external electrode fluorescent lamp which has a structure wherein an electrode is formed on the external surface is characterized by being composed of a glass having a dielectric loss tangent of not more than 0.02 at 40 KHz and 250°C and a strain point of not more than 650°C. Specifically, the glass is composed of an aluminoborosilicate glass having a chemical composition including, in mass percent, SiO 2 : 35-65%, B 2 O 3 : 0.1-25%, Al 2 O 3 : 2-20% and Li 2 O + Na 2 O + K 2 O: 0.1-5%, or a chemical composition including, in mass percent, SiO 2 : 35-65%, B 2 O 3 : 0.1-25%, Al 2 O 3 : 2-12.5% and Li 2 O + Na 2 O + K 2 O: from 0% to less than 0.1%.