Method of placing mask mounting pins in a CRT faceplate

Details Method of placing mask mounting pins in a CRT faceplate Method of placing mask mounting pins in a CRT faceplate

1979-10-22

1981-05-19

Lazarus, Richard B.

Metal working

Barrier layer or semiconductor device making

Barrier layer device making

29 2513, H01J 918

Patent

active

042676240

ABSTRACT:
The disclosure relates to a cathode ray tube for colored television. A shadow mask is employed within the tube and is held in fixed position interiorly of the tube faceplate. The shadow mask is held in position by anchor pins positioned within the four corners of the faceplate. A method has been devised whereby the shadow mask is permitted a certain degree of flexibility, thus permitting the surface of the shadow mask to follow the curvature of the interior surface of the faceplate. The method encompasses fixing three of the shadow mask support points within the faceplate to define a reference plane, then gauging the distance from the established plane to the interior surface of the faceplate so that the fourth shadow mask support point can be positioned in its optimum position to minimize any errors in the distance between the surfaces of the shadow mask and the interior of the faceplate.

REFERENCES:
patent: 3482286 (1969-12-01), Fassett et al.
patent: 3701185 (1972-10-01), Van Renssen
patent: 4058875 (1977-11-01), Nubani et al.

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