Insulating mount for a CRT Einzel lens focus mask

Details Insulating mount for a CRT Einzel lens focus mask Insulating mount for a CRT Einzel lens focus mask

1984-08-17

1986-07-22

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313402, H01J 2907

Patent

active

046021868

ABSTRACT:
A CRT has an Einzel lens focus mask with a high voltage between the shadow mask and the meshes to achieve a strong focusing action and therefore minimize beam current interception by the shadow mask. The mask is supported by an insulating block inside a tube. During gettering, the getter material does not deposit on the inside of the tube and therefore spurious conduction paths are avoided. Thus the support can withstand the high voltage. A lead-in wire for the mask has a tube surrounding it which is open near the mask. This also withstands the high voltage.

REFERENCES:
patent: 2824988 (1958-02-01), Cone
patent: 3421048 (1969-01-01), Christensen

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