# US 6,342,756 B1 · Anti-doming compositions for a shadow-mask and processes for preparing the same

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- Number: US 6,342,756 B1
- Document ID: US6342756B1
- Status: Granted
- Kind: B1
- Application number: 09/504,127
- Filed: 2000-02-15
- Granted: 2002-01-29
- Earliest claimed: 2000-02-15
- Web page: https://patentgrep.com/patent/US6342756B1

## CPC

- H01J 29/07: Shadow masks for colour television tubes
- H01J 9/146: {Surface treatment, e.g. blackening, coating (H01J9/144 takes precedence)}
- H01J 2229/0783: improving thermal radiation properties
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)

## Abstract

An anti-doming composition including a mixture of electron reflecting material such as bismuth oxide, and a zeolite, and a shadow-mask coated with the composition restrict temperature increase by preventing heat transfer, an anti-doming composition including lead and a ZnO, B2O3, Bi2O3 or a mixture thereof, and a shadow-mask coated with the composition protect mechanical expansion of a shadow-mask, and an anti-doming composition including ferroelectrics such as PZT, PT, PZ or PLZT, and a shadow-mask coated with the composition restrict temperature increase by changing the energy of electron beams into non-thermal energy. The shadow-mask of the present invention reduces about 30 to 50% of the anti-doming ratio and has a low production cost and easiness during processes.