Abstract An improved color cathode ray tube of the shadow mask type is provided wherein localized areas of a primary conductive substance are disposed on the interior surface of the envelope funnel and neck portions separately covering the high voltage button and gun assembly contact areas. A substantially continuous secondary reflective coating of gas-sorbtive electrically conductive metallic material, providing advantageous life performance results, is disposed over the back surface of the shadow mask and over the interior surface of the funnel portion to provide a final anode coating effecting a peripheral unipotential field for the tube and electrically connecting the mask-screen area and the aforementioned localized primary coated areas. A thin tertiary film of high-efficiency gas-adsorbing getter material is disposed over at least a portion of the secondary conductive coating material.
The cathode ray tube improvement according to claim 1 wherein said second discrete area of said primary conductive substance is in the shape of a substantially annular band forming a closed conductive loop.
Claim 2
Dependent Claim
23 words
The cathode ray tube improvement according to claim 1 wherein said secondary gas-sorbtive electrically conductive metallic final anode coating material is substantially magnesium.
Claim 3
Dependent Claim
54 words
The cathode ray tube improvement according to claim 1 wherein a third localized discrete area of said primary conductive substance is disposed on the forward region of the interior surface of said funnel portion adjacent the periphery of said metallic member whereof connective means associated with said plural-opening metallic member makes electrical contact therewith.
Claim 4
Dependent Claim
28 words
The cathode ray tube improvement according to claim 1 wherein said primary conductive substance is of a composition differing from that of said secondary gas-sorbtive conductive metallic material.
Claim 5
Dependent Claim
31 words
The cathode ray tube improvement according to claim 1 wherein at least one source of said secondary gas-sorbtive conductive metallic final anode coating material is oriented relative to said metallic member.
Claim 6
Dependent Claim
29 words
The cathode ray tube improvement according to claim 1 wherein the patterned cathodoluminescent screen formed on the interior surface of said face panel has an aluminum film disposed thereover.