FUNNEL GLASS FOR CATHODE−RAY TUBE - NIPPON ELECTRIC GLASS CO

Title:

FUNNEL GLASS FOR CATHODE−RAY TUBE

Document Type and Number:

WIPO Patent Application WO/2003/022765

Kind Code:

A1

Abstract:

A funnel glass for a cathode−ray tube which has a chemical composition, in mass %: SiO₂: 48 to 62 %, Al₂O₃: 1.4 to 4.1 %, PbO: 5 to 15 %, MgO: 0 to 2 %, CaO: 0.1 to 4 %, SrO 3 to 8 %, BaO: 3 to 8 %, ZnO: 0 to 2 %, Na₂O: 4 to 9 %, K₂O: 4 to 9 %, ZrO₂: 0.3 to 2 %, TiO₂: 0 to 1 %, CeO₂: 0 to 1 %, Sb₂O₃: 0 to 2 %, and Fe₂O₃: 0.03 to 1 %, provided that a value of (SrO &plus BaO)&sol PbO is in the range of 1.0 to 3.2 and a value of Al₂O₃&sol PbO is in the range of 0.13 to 0.4, and exhibits a coefficient of absorption of X−ray of 40 cm⁻¹ or more at 0.6 Å.

Inventors:

MIWA YOSHIHARU (JP)

Application Number:

PCT/JP2002/008862

Publication Date:

March 20, 2003

Filing Date:

September 02, 2002

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Assignee:

NIPPON ELECTRIC GLASS CO (JP)
MIWA YOSHIHARU (JP)

International Classes:

C03C3/105; C03C4/08; H01J29/86; (IPC1-7): C03C3/105; C03C4/08; H01J29/86

Foreign References:

JP2002211948A	2002-07-31
JP2002060242A	2002-02-26
JP2001172044A	2001-06-26
US4520115A	1985-05-28

Attorney, Agent or Firm:

Goto, Yosuke (4-10 Nishishinbashi 1-chom, Minato-ku Tokyo, JP)

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