Method of fabricating a multibeam electron gun structure

Claim 2

Method of fabricating a multibeam electron gun structure formed for positioning in a cathode ray tube, said gun structure having an electron emission plane, a substantially planar control electrode mat formed of an array substantially longitudinal individual electrode members each having a beam aperture therein and separate leads therefrom, at least one substantially planar accelerating-collimating electrode mat with a plurality of beam apertures corresponding in array and number to the beam apertures in the control electrode array, each of said electrode mats having therein a plurality of affixal perforations and a plurality of alignment perforations, and insulative electrode spacer means having a center opening therein, said fabricating method utilizing an electrode alignment device having a plurality of vertical pins for holding said respective electrode mats and comprising the steps of: positioning at least one accelerating-collimating electrode mat on said alignment device with said alignmEnt perforations mating with said pins on said device; positioning an insulative electrode spacer means upon said accelerating-collimating electrode mat; positioning said control electrode mat atop said electrode spacer means in said alignment device with said alignment perforations mating with said pins thereon; said longitudinal individual electrode members being bridged across said central opening in said spacer means; aligning said beam apertures in said planar control electrode mat and said accelerating-collimating planar electrode mat; and affixing said electrode mats to said insulative spacer means therebetween.

Claim 3

Method of fabricating multibeam electron gun structure having an axis therethrough and formed for positioning on a multi-lead stem portion of a cathode ray tube, said gun structure having a thermionic cathode with an emission plane, cathode shielding means, a substantially planar control electrode mat formed of an array of individual electrode members each having a beam aperture therein and separate leads therefrom, at least one substantially planar accelerating-collimating electrode mat with a plurality of beam apertures corresponding in array and number to the beam apertures in the control electrode array, each of said electrode mats having spaced on either side of said aperture array a set of similarly oriented affixal perforations and a set of alignment perforations located in two opposed vertical extremital portions of said mats, insulative electrode spacer means formed of a thickness to separate said electrode mats and having two sets of affixal perforations therein, and a pair of cathode spacer means, said fabricating method utilizing an electrode alignment device for holding said respective electrode mats and comprising the steps of: positioning at least one accelerating-collimating electrode mat on said alignment device with said sets of alignment perforations mating with corresponding sets of protruding pins on said device; positioning an insulative electrode spacer means upon said accelerating-collimating electrode mat; positioning said control electrode mat atop said electrode spacer means in said alignment device with said alignment perforations mating with said pins thereon; aligning said beam apertures in said planar control electrode mat and said accelerating-collimating planar electrode mat; affixing said planar control electrode mat and said accelerating-collimating planar electrode mat to said insulative spacer means therebetween to form an electrode assembly; and removing said vertical extremital portions of said electrode mats adjacent to said electrode spacer means, said removal providing separate lead connections for the individual electrode members of said control electrode plane.

Claim 4

Method of fabricating multibeam electron gun structure having an axis therethrough and formed for positioning on a multi-lead stem portion of a cathode ray tube, said gun structure having a thermionic cathode with an emission plane, cathode shielding means, a substantially planar control electrode mat formed of an array of individual electrode members each having a beam aperture therein and separate leads therefrom, at least one substantially planar accelerating-collimating electrode mat with a plurality of beam apertures corresponding in array and number to the beam apertures in the control electrode array, each of said electrode mats having spaced on either side of said aperture array a set of similarly oriented affixal perforations and a set of alignment perforations located in two opposed vertical extremital portions of said mats, insulative electrode spacer means formed of a thickness to separate said electrode mats and having two sets of affixal perforations therein, and a pair of cathode spacer means, said fabricating method utilizing an electrode alignment device for holding said respective electrode mats and comprising the steps of: positioning at least one accelerating-collimating electrode mat on said alignment device with said sets of alignment perforations mating with corresponding sets of protruding pins on said device; positioning an insulative electrode spacer means upon said accelerating-collimating electrode mat; positioning said control electrode mat atop said electrode spacer means in said alignment device with said alignment perforations mating with said pins thereon; aligning said beam apertures in said planar control electrode mat and said accelerating-collimating planar electrode mat; affixing said planar control electrode mat and said accelerating-collimating planar electrode mat to said insulative spacer means therebetween to form an electrode assembly; and removing said vertical extremital portions of said electrode mats adjacent to said electrode spacer means, said removal providing separate lead connections for the individual electrode members of said control electrode plane.

Claim 5

The method of fabricating a multibeam electron gun structure according to claim 2 wherein said affixation of said planar control electrode and said accelerating-collimating planar electrode mats, and the respective insulative spacer means therebetween is accomplished by inserting rod-like clamping means through said similarly oriented affixal perforations.

Claim 6

The method of fabricating a multibeam electron gun structure according to claim 2 wherein the affixation of said planar control electrode and said accelerating-collimating planar electrode mats, and the respective insulative spacer means therebetween is accomplished by cement bonding means between and through said similarly oriented affixal perforations.

Claim 7

The method of fabricating a multibeam electron gun structure according to claim 2 wherein the positioning of said cathode shielding means in spaced relationship with said cathode is accomplished simultaneously with the affixation of said respective electrode mats.

Claim 8

The method of fabricating a multibeam electron gun structure according to claim 2 wherein said cathode spacer means are in the form of a pair of multiple apertured wafer-like insulative members one of which is positioneD on either side of said assembly after the vertical extremital portions of said electrode mats have been removed, the planes of said wafer-like members being substantially parallel with said axis; said wafer-like member positioning being followed by the positioning of said thermionic cathode in related apertures in said wafer-like member in a manner that said emission plane is facing said adjacent electrode mat; and said apertured wafer members being secured to said gun structure to maintain the desired positioning of said cathode in said gun structure.

Claim 9

The method of fabricating a multibeam electron gun structure according to claim 2 wherein said cathode shielding means and said adjacent electrode mat have a plurality of protruding tabs extending laterally therefrom; and wherein said apertured wafer members, having tab related apertures therein, are positionally secured on said tabs.

Claim 10

The method of fabricating a multibeam electron gun structure according to claim 2 wherein said cathode spacer means are in the form of a pair of spaced-apart angular-shaped stand-off positioners attached to said cathode and affixed to isolated elements in the electrode mat adjacent to said emission plane before said electrode mat is positioned on said electrode alignment device.

Claim 11

The method of fabricating a multibeam electron gun structure according to claim 4 wherein said cemented assembly is outgassed by heating prior to the removal of said vertical extremital portions.