Abstract The disclosed method of forming a control grid assembly having separate co-planar spaced grids for the electron gun of a multibeam cathode ray tube, includes the steps of forming a pair of identical metal wafers having two spaced holes, forming two waferlike insulating members having elongated slots, and forming a flat metal member having a rectangular framelike portion and a plurality of elongated spaced metal fingers extending to opposed frame portions inwardly toward one another within the frame portion and with opposed fingers separated by a distance less than the width of said slots. A sandwich of elements is formed with the third metal member in the center, an insulator member on each side thereof, and a metal member overlying said insulator members, and this assembly is aligned so that the holes of said members and said slots are in line, including aligning with a pin extended through opposed overlying holes and said intermdiately located slots, and with the end portion of each of said projecting metal fingers extending into the windows formed by each of the slots. The assembly is diffusion bonded to form a unitary assembly and a coolant fluid is introduced into the slots via said holes for cooling the sandwich and electrical discharge machining a plurality of minute holes through the sandwich at locations in line with corresponding ones of said projecting fingers so as to form a plurality of minute passages through each of the members and the projecting finger, and wherein eroded material may be flushed out from the slots by said fluid through said relatively large holes, and cutting away a portion of the framelike portion of the metal member to leave portions of spaced metal fingers extending outwardly from the sandwich of elements.
The method of forming a control grid assembly having separate co-planar spaced grids for the electron gun of a multibeam cathode ray tube, comprising the steps of: forming a pair of substantially identical waferlike metal members of a predetermined width and length, said members having at least two spaced holes therethrough; forming a pair of substantially identical waferlike insulating members of said predetermined length and width, said members having elongated slots therethrough to form windows; forming a third relatively flat metal member having a rectangular framelike portion and a plurality of elongated spaced metal finger members extending from two opposed frame portions inwardly toward one another within said framelike portion with opposed fingers separated by a distance less than the width of said slots in said insulator members; and said framelike portion having a width greater than the width of said insulator members and of said pair of metal members; forming a sandwich of said elements with said third metal member in the center, an insulator member on each side thereof and one of said metal members overlying said insulator members on each side thereof and aligning same so that said holes of said members and said slots are in line, including aligning with a pin extended through opposed overlying holes and said intermediately located slots, and with the end portion of each of said projecting metal fingers extending into the windows formed by each of said slots in said insulator members; diffusion bonding said members together to form a unitary assembly; introducing a coolant fluid into said slots via said holes for cooling said sandwich and electrical discharge machining a plurality of minute holes through said sandwich of elements at locations in line with corresponding ones of said projecting fingers whereby a plurality of minute passages are formed along an axis through said first metal member, through a projecting metal finger and said second metal member and whereby eroded material may be flushed out from the slots by said fluid through said relatively large holes; and cutting away a sufficient portion of said framelike portion of said third metal member to leave portions of said spaced metal fingers extending outwardly from said sandwich of elements.
Claim 2
Independent Claim
366 words
The method of forming a control grid assembly having separate co-planar spaced grids for the electron gun of a multibeam cathode ray tube, comprising the steps of: forming a pair of substantially identical waferlike metal members of a predetermined width and length, said members having at least two spaced holes therethrough; forming a pair of substantially identical waferlike insulating members of said predetermined length and width, said members having elongated slots therethrough to form windows; forming a third relatively flat metal member having a rectangular framelike portion and a plurality of elongated spaced metal finger members extending from two opposed frame portions inwardly toward one another within said framelike portion with opposed fingers separated by a distance less than the width of said slots in said insulator members; and said framelike portion having a width greater than the width of said insulator members and of said pair of metal members; forming a sandwich of said elements with said third metal member in the center, an insulator member on each side thereof and one of said metal members overlying said insulator members on each side thereof and aligning same so that said holes of said members and said slots are in line, including aligning with a pin extended through opposed overlying holes and said intermediately located slots, and with the end portion of each of said projecting metal fingers extending into the windows formed by each of said slots in said insulator members; diffusion bonding said members together to form a unitary assembly; introducing a coolant fluid into said slots via said holes for cooling said sandwich and electrical discharge machining a plurality of minute holes through said sandwich of elements at locations in line with corresponding ones of said projecting fingers whereby a plurality of minute passages are formed along an axis through said first metal member, through a projecting metal finger and said second metal member and whereby eroded material may be flushed out from the slots by said fluid through said relatively large holes; and cutting away a sufficient portion of said framelike portion of said third metal member to leave portions of said spaced metal fingers extending outwardly from said sandwich of elements.