Color cathode ray tube of shadow mask type

Details Color cathode ray tube of shadow mask type Color cathode ray tube of shadow mask type

1989-08-22

1991-07-02

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313407, H01J 2907

Patent

active

050288369

ABSTRACT:
A color cathode ray tube of the shadow mask type capable of reducing the color unbalance due to the doming phenomenon of shadow mask is disclosed, in which a material having a low thermal conductivity is vacuum-deposited on that main surface of a shadow mask which exists on the electron gun side, to prevent heat due to electron bombardment from being transmitted to the shadow mask in a short time, and the material is prevented from being deposited on that side wall of each of electron-beam transmitting holes of the shadow mask which confronts an electron gun, to suppress the generation of scattered electrons at the side wall. Thus, in the above color cathode ray tube, the color unbalance due to the thermal expansion of the shadow mask is prevented, and moreover there is not any fear of degrading the picture quality of a displayed image by halation.

REFERENCES:
patent: 4442376 (1984-04-01), Van Der Waals et al.
patent: 4864188 (1989-09-01), Sugai et al.

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