Abstract A secondary emissive electrode for image intensifiers, cathoderay tubes and the like which comprises a plate of insulating material having two substantially parallel boundary surfaces on opposite sides thereof pierced by channels, the walls of which are secondary emissive, forming a high-density network of channels between two surfaces. The periphery of this plate has at least two regions one opposite the other relative to the center of the body with channels which are filled with a core material. In the manufacture of such an electrode, all channels are initially filled with a material which can be etched away by an acid. Those channels in the regions of the periphery are covered with a coating which is etch resistant, and the core material in the remaining channels etched away after which the coating is removed.
A secondary-emissive electrode comprising a body of insulating material Having two substantially parallel boundary faces on opposite sides thereof and being pierced by channels forming a high-density network between said faces, electrode means on each of said boundary surfaces, the walls of said channels being secondary emissive, and the periphery of said plate having at least two zones opposite one another relative to the center of said plate having channels filled with a core material.
Claim 2
Dependent Claim
75 words
A secondary-emissive electrode comprising a body of insulating material Having two substantially parallel boundary faces on opposite sides thereof and being pierced by channels forming a high-density network between said faces, electrode means on each of said boundary surfaces, the walls of said channels being secondary emissive, and the periphery of said plate having at least two zones opposite one another relative to the center of said plate having channels filled with a core material.
Claim 3
Dependent Claim
17 words
An electrode as claimed in claim 1, wherein said zones with filled channels constitute a peripheral crown.
Claim 4
Independent Claim
54 words
A method of manufacturing a secondary-emissive electrode comprising the steps of coating a peripheral portion of a plate having channels filled with a core material with an acid-resistant cover, thereafter etching away with an acid the core material filling said channels outside said peripheral zone which are uncovered, and thereafter subsequently dissolving said cover.
Claim 5
Independent Claim
54 words
A method of manufacturing a secondary-emissive electrode comprising the steps of coating a peripheral portion of a plate having channels filled with a core material with an acid-resistant cover, thereafter etching away with an acid the core material filling said channels outside said peripheral zone which are uncovered, and thereafter subsequently dissolving said cover.