Method for making a cathader with integral shadow grid

Details Method for making a cathader with integral shadow grid Method for making a cathader with integral shadow grid

1989-03-22

1991-02-19

Wieder, Kenneth

Electric lamp and discharge devices

Discharge devices having a thermionic or emissive cathode

313299, 313338, 313411, 313447, 156631, 156632, 427 78, 445 50, 445 51, H01J 120, H01J 904, H01J 914

Patent

active

049947095

ABSTRACT:
A very fine-mesh, non-emissive shadow grid is formed on the smooth emissive surface 16 of a thermionic cathode 12 by deposition from a vapor a continuous layer 22 of non-emissive conductive material. Between the elements 24 of the grid the non-emissive material is removed by bombardment through an apertured mask to restore emissivity between the elevated grid elements 24.

REFERENCES:
patent: 3967150 (1976-06-01), Lien et al.
patent: 4745326 (1988-05-01), Greene et al.

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