Color cathode ray tube having variable apertures in a shadow...

Details Color cathode ray tube having variable apertures in a shadow... Color cathode ray tube having variable apertures in a shadow...

2005-10-11

2005-10-11

Guharay, Karabi (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

C313S408000

Reexamination Certificate

active

06954026

ABSTRACT:
Each of a plurality of arrays of apertures of a shadow mask has a vertically long aperture, a vertically short aperture and a bridge between these apertures. In each of the arrays of apertures, one long aperture and one or more short apertures are arranged alternately, and a horizontal maximum width HSmaxof the short aperture is larger than a horizontal basic width HLof the long aperture. This makes it possible to provide a color cathode ray tube having an improved brightness without causing moiré fringes, color displacement, breaking of the shadow mask or variation in color purity.

REFERENCES:
patent: 3652895 (1972-03-01), Tsuneta et al.
patent: 3844005 (1974-10-01), Yamada et al.
patent: 4296189 (1981-10-01), Kuzminski
patent: 5086250 (1992-02-01), Van Der Waal
patent: 5280215 (1994-01-01), Ohtake et al.
patent: 6124668 (2000-09-01), Shoda
patent: 63-43241 (1988-02-01), None
patent: 2001-84918 (2001-03-01), None
patent: 1998-020588 (1998-06-01), None
patent: 2002-0034503 (2002-05-01), None

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