Modular guided beam flat display device

Abstract

An evacuated envelope having a plurality of spaced, parallel support walls extending between and substantially perpendicular to flat substantially parallel front and back walls to provide a plurality of parallel channels extending along the front and back walls. The front and back walls and the support walls are of an electrically insulating material, typically glass. Compressed between each of the support walls and the front wall is a metal strip which serves as the tip of the support wall and which extends along the entire length of the support wall. Each tip is tapered in thickness from a thickness substantially equal to the thickness of the support wall at the support wall to a thinner thickness at the front wall. Means is provided between each metal tip and either the support wall or the front wall to prevent movement of the tip transversely of the channels. A shadow mask extends across each of the channels and extends between the metal tips and the support walls. The shadow mask is held in proper position with respect to the phosphor screen on the inner surface of the front wall by the metal tips.

.[.I.]. .Iadd.We .Iaddend.claim: 
     
       1. A display device comprising an evacuated envelope having spaced, substantially parallel front and back walls and spaced, substantially parallel support walls extending between and substantially perpendicular to the front and back walls, said support walls forming a plurality of parallel channels extending along said front and back walls,   a separable metal tip compressed between the front wall and each of said support walls and extending along the support wall, .[.each of said tips having a thickness at the support wall substantially equal to the thickness of the support wall and tapering to a thinner thickness at the front wall..]. and   means preventing movement of each of said tips in a direction transversely of the channels so as to maintain the metal tips against the support walls.   
     
     
       2. A display device in accordance with claim 1 in which the means for preventing the transverse movement of each tip comprises a plurality of retainer tabs spaced longitudinally along one side of the tip, said retainer tabs projecting beyond .[.the thicker.]. .Iadd.one .Iaddend.end of the tip and engaging one side of the adjacent support wall and a plurality of spring tabs spaced longitudinally along the other side of the tip, said spring tabs projecting beyond .[.the thicker.]. .Iadd.said one .Iaddend.end of the tip and engaging the other side of the adjacent support walls so that the spring tabs and retainer tabs clamp the support wall therebetween to hold the tip on the support wall. 
     
     
       3. A display device in accordance with claim .[.2.]. .Iadd.1 .Iaddend.including a shadow mask extending transversely across each channel and fitting between the metal tips and the support walls. 
     
     
       4. A display device in accordance with claim 3 in which the shadow mask has openings therethrough through which the spring tabs and retainer tabs extend, the spring tabs extend freely through their respective openings in the shadow mask and the retainer tabs engage an edge of their respective openings in the shadow mask to align the shadow mask with .[.with.]. respect to the front wall. 
     
     
       5. A display device in accordance with claim 4 in which each of the metal tips has longitudinally spaced feet projecting from .[.its thicker.]. .Iadd.said one .Iaddend.end and the shadow mask has openings therethrough through which the feet extend to engage the respective support wall. 
     
     
       6. A display device in accordance with claim .[.2.]. .Iadd.1 .Iaddend.in which each of the metal tips has flexible web portions at longitudinally spaced intervals therealong. 
     
     
       7. A display device in accordance with claim 6 in which the shadow mask has flexible webs in the portions thereof which extend between the metal tip and the support wall. 
     
     
       8. A display device in accordance with claim 1 in which the means for preventing the transverse movement of the metal tips includes a groove in the .[.thinner.]. .Iadd.other .Iaddend.end of each tip extending longitudinally along the tip and a separate bead projecting from the front wall along each support wall and fitting in the groove in the respective tip. 
     
     
       9. A display device in accordance with claim 8 including a shadow mask extending transversely across each channel and fitting between the support walls and the metal tips. 
     
     
       10. A display device in accordance with claim 9 in which each metal tip has a plurality of longitudinally spaced feet projecting from .[.its thicker.]. .Iadd.said one .Iaddend.end and the shadow mask has openings therethrough through which the feet extend to engage the respective support walls, at least one of the feet of each metal tip engaging the edges of its respective opening in the shadow mask to align the shadow mask with respect to the front wall. .Iadd. 
     
     
       11.  A display device in accordance with claim 1 in which the means for preventing the transverse movement of each tip comprises a plurality of members arranged at longitudinally spaced points along said support walls and said metal tips, said members extending substantially perpendicular to the longitudinal axis of said support walls and said metal tips, a portion of said members engaging one side of said support walls and said metal tips and the other portion of said members engaging the other side of said support walls and said metal tips..Iaddend. .Iadd.12. A display device in accordance with claim 1 in which said metal tips extend substantially the full length of said support walls and the edges of said metal tips rest against the edges of said support walls for a substantial portion of said lengths. .Iaddend. .Iadd.13. A display device in accordance with claim 1 in which said tips have a thickness at the support wall substantially equal to the thickness of the support wall and a thinner thickness at the front wall. .Iaddend. .Iadd.14. A display device in accordance with claim 11 in which said members extend substantially perpendicular to said front wall. .Iaddend.