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US 5,350,970 AGranted
Display tube having a detachable getter
AssigneeU.S. Philips Corporation
InventorsJohannus A. Vennix, Johannes J. M. Overbeek
Life of this patent
Estimating the term…
Abstract
A display tube has a getter structure which is clamped in an aperture of the magnetic shield. The getter structure and the screening cap may be of a simple construction and the getter structure can be replaced in a simple manner so that the display tube can be easily repaired. The getter structure is supported by the cone and the inner wall of the shield.
Claims8
A display tube comprising
- (a) an envelope including a neck, a cone and a display window;
- (b) an electron gun accommodated in the neck;
- (c) an internal magnetic shield arranged between said electron gun and said display window, said magnetic shield including an inwardly extending portion at an end facing said neck, said inwardly extending portion having an aperture;
- (d) an electrically conductive layer present on an inner wall of said cone;
- and
- (e) a detachable getter structure electrically contacting said conductive layer,
- said getter structure having a first portion projecting through said aperture and being clamped therein, said getter structure having a second portion electrically contacting said electrically conductive layer by pressing against said inner wall of said cone, and said getter structure having a third portion pressing against an inner wall of said magnetic shield,
- wherein said aperture is situated between said second and third portions.
5 more elements
Dependencies are inferred from the claim text.