Cathode support structure for an in-line electron gun assembly

Details Cathode support structure for an in-line electron gun assembly Cathode support structure for an in-line electron gun assembly

1982-02-10

1984-08-28

LaRoche, Eugene R.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313447, 313456, 313457, 313409, H01J 2950, H01J 2946

Patent

active

044685882

ABSTRACT:
An in-line electron gun assembly for a color television picture tube has a control grid and a center cathode disposed between two outer cathodes. The control grid and the cathodes are secured to a pair of insulating support rods. Each cathode is supported by a cathode support assembly comprising a cathode eyelet and a beading support member. Each beading support member varies in dimensions as a function of temperature and the center beading support member stabilizes at a higher operating temperature than the outer beading support members. The ends of the beading support members are embedded in a pair of oppositely-disposed insulating support rods. The center beading support member is formed of a material having a high thermal expansion coefficient and the outer beading support members are formed of a material having a lower thermal expansion coefficient. The materials are chosen such that the outer beading support members expand less than the center beading support member but substantially equal to one another so that the cathodes are rigidly affixed to the support rods. The expansion of the center beading support member exerts a force on the support rods that is sufficient to maintain tension on the control grid to prevent the control grid from moving during warmup.

REFERENCES:
patent: 3873879 (1975-03-01), Hughes
patent: 3974416 (1976-08-01), van der Goot et al.
patent: 4063128 (1977-12-01), Hughes
patent: 4071803 (1978-01-01), Takanashi et al.
patent: 4138624 (1979-02-01), Srowig

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