Manufacturing method of color picture tube

Details Manufacturing method of color picture tube Manufacturing method of color picture tube

1984-09-07

1987-06-09

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

Electrode making

313402, 430 23, H01J 9227

Patent

active

046717765

ABSTRACT:
A manufacturing method of a color picture tube includes the steps of forming a shadow mask having a main surface portion in which a plurality of apertures are formed, coating at least one surface of the main surface portion of the shadow mask with ceramic material, heat-treating the shadow mask, thereby chemically bonding said ceramic material to said surface so as to remain the residual tensile stress in said shadow mask, and forming a phosphor screen, for emitting multi-color light by bombardment of the electron beams selectively transmitted through the apertures, on an inner surface of a panel using the shadow mask. The heat treatment of the shadow mask is performed before forming the phosphor screen to prevent improper change in the relationship between the positions of the apertures and phosphors due to residual tensile stress.

REFERENCES:
patent: 3668002 (1972-06-01), Okabe et al.
patent: 3703374 (1972-11-01), Okabe et al.
patent: 3822454 (1974-07-01), Speigel
patent: 3912482 (1975-10-01), La Grouw et al.

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