Braun tube for projectors

Details Braun tube for projectors Braun tube for projectors

2005-06-21

2005-06-21

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Screen

C313S463000, C313S467000, C313S485000, C313S486000, C313S487000

Reexamination Certificate

active

06909228

ABSTRACT:
The present invention proposes a Braun Tube for projectors having an illuminant layer provided on a phosphor screen, the illuminant layer including Zinc Silver Aluminum Oxide (ZnS:Ag, Al) as a blue color illuminant, Yttrium Terbium Silicate (Y2SiO5:Tb) as a green color illuminant, and Yttrium Europium Oxide (Y2O3:Eu) as a red color illuminant, all illuminants having particle size of 5 to 7 μm. As a result, it is possible to realize a Braun Tube for projectors, in which an extended life cycle is achieved by constraining the degradation of the illuminant, constraining the browning phenomenon, as well as improving the spot size of the electron beam thereof.

REFERENCES:
patent: 4219587 (1980-08-01), Oba et al.
patent: 5256463 (1993-10-01), Osaka et al.
patent: 5369331 (1994-11-01), Mizukami et al.
patent: 5707549 (1998-01-01), Matsukiyo et al.
patent: 6268691 (2001-07-01), Takemura et al.

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