Shadow mask having slotted skirt portion

Details Shadow mask having slotted skirt portion Shadow mask having slotted skirt portion

2005-04-26

2005-04-26

Patel, Nimeshkumar D. (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

C313S402000, C313S405000, C313S406000, C313S407000, C313S408000, C445S030000

Reexamination Certificate

active

06885141

ABSTRACT:
A cathode ray tube comprises a panel; a funnel engaged to the panel for forming a vacuous space; and a shadow mask supported in the cathode ray tube by being fixed to a mask frame and including an effective surface having a plurality of electron beam passing holes at a center thereof, an ineffective surface formed at a periphery of the effective surface and not having the electron beam passing holes and a skirt portion extended from the ineffective surface towards a vertical direction thereof and welded to the mask frame. In the cathode ray tube, a slot of a predetermined size is formed between welding points by which the skirt portion is welded to the mask frame, and a height of the slot from an end of the skirt portion is higher than a height of the welding points, thereby reducing a doming effect of the shadow mask, reducing a mis-landing which the electron beam does not land to a precise landing point, and thus preventing a color purity of a screen from being deteriorated.

REFERENCES:
patent: 6051918 (2000-04-01), Hayashi et al.
patent: 6552482 (2003-04-01), Ito et al.
patent: 6559585 (2003-05-01), Murai et al.
patent: 2002-0055409 (2002-07-01), None
patent: 2002-0068932 (2002-08-01), None

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