Shadow mask mounting arrangement for color CRT

Details Shadow mask mounting arrangement for color CRT Shadow mask mounting arrangement for color CRT

1998-06-22

2000-10-10

Patel, Nimeshkumar D.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313404, 313406, H01J 2980

Patent

active

061305014

ABSTRACT:
An arrangement for mounting a shadow mask, or color selection electrode, in the glass envelope of a color cathode ray tube (CRT) includes four resilient metal holders, each spot welded to a respective upper, lower or lateral portion of the shadow mask's skirt. Each holder is formed from a unitary metal strip which is shaped so as to include an inner mounting portion spot welded to the mask's skirt and an outer apertured portion adapted to receive a stud attached to and extending inwardly from the CRT's glass envelope. The shadow mask undergoes thermal deformation, or doming, when heated by electron beams incident thereon and transfers heat to each of the metallic holders. Each of the metallic holders, in turn, undergoes thermal deformation, but because of the shape and orientation of the holders relative to the shadow mask, the four holders deflect the shadow mask in a direction generally perpendicular to and outward from the CRT's glass display screen, i.e., along the CRT's Z-axis. By deflecting the thermally deformed shadow mask along the CRT's Z-axis, alignment between the mask's beam passing apertures and phosphor deposits on the CRT's display screen is maintained and video image color purity is not degraded.

REFERENCES:
patent: 3735190 (1973-05-01), Say
patent: 3873875 (1975-03-01), Miller
patent: 3894260 (1975-07-01), Sedivy
patent: 5066886 (1991-11-01), Harner et al.
patent: 5072150 (1991-12-01), Lee
patent: 5126624 (1992-06-01), Ji
patent: 5210459 (1993-05-01), Lee
patent: 5534746 (1996-07-01), Marks et al.

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