Cathode ray tube with strengthened shadow mask

Details Cathode ray tube with strengthened shadow mask Cathode ray tube with strengthened shadow mask

2006-02-28

2006-02-28

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

Reexamination Certificate

active

07005785

ABSTRACT:
A cathode ray tube comprising a panel having an outer surface which is substantially flat and an inner surface which has a radius of curvature, and a shadow mask having a plurality of apertures through which electron beams pass, wherein a ratio Sh/Sv of a horizontal dimension Sh of the aperture to a vertical dimension Sv of the aperture satisfies a condition of Sh/Sv<1 at a central portion of the shadow mask, and thereby improving strength of the shadow mask. Thusly, deformation of the shadow mask caused by an external impact or the like can be minimized, and a grade of color purity of a screen can be maintained optimally.

REFERENCES:
patent: 3766419 (1973-10-01), Barbin
patent: 5616985 (1997-04-01), Hosotani
patent: 5990607 (1999-11-01), Tseng et al.
patent: 6465945 (2002-10-01), Tsuchida et al.
patent: 6486596 (2002-11-01), Inoue et al.
patent: 6548954 (2003-04-01), Ishii et al.
patent: 1095523 (1994-11-01), None
patent: 1110829 (1995-10-01), None

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