US2004038798A1PendingUtilityA1

CRT funnel of a non beam-index type

Assignee: NIPPON ELECTRIC GLASS COPriority: Dec 25, 2000Filed: Sep 2, 2003Published: Feb 26, 2004

Est. expiryDec 25, 2020(expired)· nominal 20-yr term from priority

Inventors:Hiroshi Komori Hiroki Yamazaki

C03C 3/105H01J 29/863C03C 4/087

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References

Claims

Abstract

A CRT funnel of a non beam-index type is made of a lead glass which contains 10-30 mass % of PbO and has an X-ray absorption coefficient of 40 cm −1 or more at 0.6 Å. The lead glass further contains Sb 2 O 3 and an additive including at least one of CeO 2 and SnO 2 . In case where the additive includes CeO 2 , it is preferable that the content of CeO 2 is not smaller than 0.01 mass % and is smaller than 0.5 mass %. In case where the additive includes SnO 2 , the content of SnO 2 preferably falls within a range of 0.001-2 mass %.

Claims

exact text as granted — not AI-modified

What is claimed is:

1 . A CRT funnel of a non beam-index type, made of a lead glass which contains 10-30 mass % of PbO, which has an X-ray absorption coefficient of 40 cm −1 or more at 0.6 Å, and which contains Sb 2 O 3 and an additive comprising at least one of CeO 2 and SnO 2 .

2 . The CRT funnel according to claim 1 , wherein the content of PbO falls within a range of 15-27 mass %.

3 . The CRT funnel according to claim 1 , wherein the content of Sb 2 O 3 falls within a range of 0.01-1 mass %.

4 . The CRT funnel according to claim 1 , wherein said additive solely comprises CeO 2 , the content of CeO 2 being not smaller than 0.01 mass % and being smaller than 0.5 mass %.

5 . The CRT funnel according to claim 4 , wherein the content of CeO 2 falls within a range of 0.01-0.45 mass %.

6 . The CRT funnel according to claim 1 , wherein said additive solely comprises SnO 2 , the content of SnO 2 falling within a range of 0.001-2 mass %.

7 . The CRT funnel according to claim 6 , wherein the content of SnO 2 falls within a range of 0.001-1.5 mass %.

8 . The CRT funnel according to claim 1 , wherein said additive comprises CeO 2 and SnO 2 , the content of CeO 2 being not smaller than 0.01 mass % and being smaller than 0.5 mass %, the content of SnO 2 falling within a range of 0.001-1.5 mass %.

9 . The CRT funnel according to claim 8 , wherein the content of CeO 2 falls within a range of 0.01-0.45 mass % while the content of SnO 2 falls within a range of 0.001-1.5 mass %.

10 . The CRT funnel according to claim 1 , wherein said glass further contains, in mass %, 48-58% SiO 2 , 0.5-6% Al 2 O 3 , 0-5% MgO, 0-6% CaO, 0-9% SrO, 0-9% BaO, 3-9% Na 2 O, 4-11% K2O, 0-5% ZnO, and 0-2% ZrO 2 .

11 . The CRT funnel according to claim 10 , wherein the content of SiO 2 falls within a range of 49-57 mass %.

12 . The CRT funnel according to claim 10 , wherein the content of Al 2 O 3 falls within a range of 1-5 mass %.

13 . The CRT funnel according to claim 10 , wherein the content of MgO is 4 mass % or less.

14 . The CRT funnel according to claim 10 , wherein the content of CaO falls within a range of 1-5 mass %.

15 . The CRT funnel according to claim 10 , wherein the content of SrO is 7 mass % or less.

16 . The CRT funnel according to claim 10 , wherein the content of BaO is 7 mass % or less.

17 . The CRT funnel according to claim 10 , wherein the content of Na 2 O falls within a range of 4-8 mass %.

18 . The CRT funnel according to claim 10 , wherein the content of K2O falls within a range of 5-10 mass %.

19 . The CRT funnel according to claim 10 , wherein the content of ZnO is 4 mass % or less.

20 . The CRT funnel according to claim 10 , wherein the content of ZrO 2 falls within a range of 0-1.5 mass %.

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