| 摘要 |
PROBLEM TO BE SOLVED: To provide an outer envelope for external electrode fluorescent lamp which has little dielectric loss and hardly has fluctuations in dielectric capacity. SOLUTION: The outer envelope for external electrode fluorescent lamp, used for manufacture of a external electrode fluorescent lamp having an electrode formed at the outside, is made of a glass of which the dielectric tangent at 40 KHz, 250°C is 0.02 or less and the strain point is 650°C or less. The above glass is composed of an alumino-borosilicate glass having a composition of SiO<SB>2</SB>35 to 65%, B<SB>2</SB>O<SB>3</SB>0.1 to 25%, Al<SB>2</SB>O<SB>3</SB>2 to 20%, Li<SB>2</SB>O+Na<SB>2</SB>O+K<SB>2</SB>O 0.1 to 5% in mass percentage, or SiO<SB>2</SB>35 to 65%, B<SB>2</SB>O<SB>3</SB>0.1 to 25%, Al<SB>2</SB>O<SB>3</SB>2 to 12.5%, Li<SB>2</SB>O+Na<SB>2</SB>O+K<SB>2</SB>O 0 to 0.1% or less in mass percentage. COPYRIGHT: (C)2005,JPO&NCIPI
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