Sealing for CRT components

Claim 1

In the manufacture of color cathode ray tubes, a method of joining two components composed of glass, ceramic, metal or other material amenable to being bonded together by the use of frit-based or other vitreous cement characterized by having a high cohesiveness and low propensity for wetting said components to be joined such that re-entrancies may be formed in the joint which tend to weaken the joint when subjected to loading, said method comprising: providing a first component having a predetermined first sealing area and a second component having a predetermined second sealing area adapted to mate with said first sealing area; applying to at least one of said sealing areas a viscous layer of cement comprised of a frit-based or other vitreous material characterized by having properties of high cohesion and low propensity for wetting said components; and mating said components along said sealing areas and baking the assembled combination to harden said cement, said method being characterized by including the step prior to said applying of said cement of applying a viscous priming layer of said same vitreous cement on at least one of said sealing areas which is composed of a material to which said cement has a high wetting affinity, the terminations of said viscous priming layer being caused to lie in regions of low stress outside the joint, whereby the resultant joint has a substantially reduced or non-existent tendency to form re-entrant seals in the component interface area where stresses when the joint is loaded may be high, thereby markedly reducing joint failures due to stress concentrations in the joint region, and whereby any stress concentrations resulting from re-entrancies formed at said terminations of said viscous priming layer, being in regions of low stress, are relatively harmless.

Claim 3

A method of frit-sealing the funnel and the faceplate of a cathode ray tube, comprising: providing a glass funnel having a predetermined sealing area and a glass faceplate having a predetermined sealing area adapted to mate with said funnel sealing area; applying to at least one of said sealing areas a viscous bead of cement comprised of a frit-based material characterized by having properties of high cohesion and poor wetting of glass; and mating said faceplate and funnel sealing areas and baking the assembled combination to harden said cement, said method being characterized by including the step prior to said applying of said cement of applying a viscous priming layer of said same frit-based cement on at least one of said sealing areas composed of a material to which said frit cement has a high wetting affinity, the terminations of said viscous priming layer being caused to lie in regions of low stress outside the faceplate-funnel interface, whereby the resultant faceplate-funnel joint has a substantially reduced or non-existent tendency to form re-entrant seals in the faceplate-funnel interface where stresses are high, thereby markedly reducing joint failures due to stress concentrations in the joint region, and whereby any stress concentrations resulting from re-entrancies formed at said terminations of said viscous priming layer, being in regions of low stress, are relatively harmless.

Claim 4

A method of frit-sealing the funnel and the faceplate of a cathode ray tube, comprising: providing a glass funnel having a predetermined sealing area and a glass faceplate having a predetermined sealing area adapted to mate with said funnel sealing area; applying to at least one of said sealing areas a viscous bead of cement comprised of a frit-based material characterized by having properties of high cohesion and poor wetting of glass; and mating said faceplate and funnel sealing areas and baking the assembled combination to harden said cement, said method being characterized by including the step prior to said applying of said cement of applying a viscous priming layer of said same frit-based cement on at least one of said sealing areas composed of a material to which said frit cement has a high wetting affinity, the terminations of said viscous priming layer being caused to lie in regions of low stress outside the faceplate-funnel interface, whereby the resultant faceplate-funnel joint has a substantially reduced or non-existent tendency to form re-entrant seals in the faceplate-funnel interface where stresses are high, thereby markedly reducing joint failures due to stress concentrations in the joint region, and whereby any stress concentrations resulting from re-entrancies formed at said terminations of said viscous priming layer, being in regions of low stress, are relatively harmless.

Claim 6

A method of frit-sealing the funnel and the faceplate of a cathode ray tube, comprising: providing a glass funnel having a predetermined sealing area and a glass faceplate having a predetermined sealing area adapted to mate with said funnel sealing area; applying to at least one of said sealing areas a viscous bead of cement comprised of a frit-based material characterized by having properties of high cohesion and poor wetting of glass; and mating said faceplate and funnel sealing areas and baking the assembled combination to harden said cement, said method being characterized by including the step prior to said applying of said cement of applying a viscous priming layer of said same frit-based cement on at least one of said sealing areas composed of a material to which said frit cement has a high wetting affinity, the terminations of said viscous priming layer being caused to lie in regions of low stress outside the faceplate-funnel interface, whereby the resultant faceplate-funnel joint has a substantially reduced or non-existent tendency to form re-entrant seals in the faceplate-funnel interface where stresses are high, thereby markedly reducing joint failures due to stress concentrations in the joint region, and whereby any stress concentrations resulting from re-entrancies formed at said terminations of said viscous priming layer, being in regions of low stress, are relatively harmless, wherein said applying comprises rolling said priming material on at least one of the sealing areas of said funnel and said faceplate.

Claim 7

A method of frit-sealing the funnel and the faceplate of a cathode ray tube, comprising: providing a glass funnel having a predetermined sealing area and a glass faceplate having a predetermined sealing area adapted to mate with said funnel sealing area; applying to at least one of said sealing areas a viscous bead of cement comprised of a frit-based material characterized by having properties of high cohesion and poor wetting of glass; and mating said faceplate and funnel sealing areas and baking the assembled combination to harden said cement, said method being characterized by including the step prior to said applying of said cement of applying a viscous priming layer of said same frit-based cement on at least one of said sealing areas composed of a material to which said frit cement has a high wetting affinity, the terminations of said viscous priming layer being caused to lie in regions of low stress outside the faceplate-funnel interface, whereby the resultant faceplate-funnel joint has a substantially reduced or non-existent tendency to form re-entrant seals in the faceplate-funnel interface where stresses are high, thereby markedly reducing joint failures due to stress concentrations in the joint region, and whereby any stress concentrations resulting from re-entrancies formed at said terminations of said viscous priming layer, being in regions of low stress, are relatively harmless, wherein said applying comprises rolling said priming material on at least one of the sealing areas of said funnel and said faceplate.

Claim 8

A method of frit-sealing the funnel and the faceplate of a cathode ray tube, comprising: providing a glass funnel having a predetermined sealing area and a glass faceplate having a predetermined sealing area adapted to mate with said funnel sealing area; applying to at least one of said sealing areas a viscous bead of cement comprised of a frit-based material characterized by having properties of high cohesion and poor wetting of glass; and mating said faceplate and funnel sealing areas and baking the assembled combinations to harden said cement, said method being characterized by including the step prior to said applying of said cement of applying a viscous priming layer of said same frit-based cement on at least one of said sealing areas composed of a material to which said frit cement has a high wetting affinity, the terminations of said viscous priming layer being caused to lie in regions of low stress outside the faceplate-funnel interface, whereby the resultant faceplate-funnel joint has a substantially reduced or non-existent tendency to form re-entrant seals in the faceplate-funnel interface where stresses are high, thereby markedly reducing joint failures due to stress concentrations in the joint region, and whereby any stress concentrations resulting from re-entrancies formed at said terminations of said viscous priming layer, being in regions of low stress, are relatively harmless, wherein said applying comprises silk screening said priming material on at least one of the sealing areas of said funnel and said faceplate.

Claim 9

A method of frit-sealing the funnel and the faceplate of a cathode ray tube, comprising: providing a glass funnel having a predetermined sealing area and a glass faceplate having a predetermined sealing area adapted to mate with said funnel sealing area; applying to at least one of said sealing areas a viscous bead of cement comprised of a frit-based material characterized by having properties of high cohesion and poor wetting of glass; and mating said faceplate and funnel sealing areas and baking the assembled combinations to harden said cement, said method being characterized by including the step prior to said applying of said cement of applying a viscous priming layer of said same frit-based cement on at least one of said sealing areas composed of a material to which said frit cement has a high wetting affinity, the terminations of said viscous priming layer being caused to lie in regions of low stress outside the faceplate-funnel interface, whereby the resultant faceplate-funnel joint has a substantially reduced or non-existent tendency to form re-entrant seals in the faceplate-funnel interface where stresses are high, thereby markedly reducing joint failures due to stress concentrations in the joint region, and whereby any stress concentrations resulting from re-entrancies formed at said terminations of said viscous priming layer, being in regions of low stress, are relatively harmless, wherein said applying comprises silk screening said priming material on at least one of the sealing areas of said funnel and said faceplate.

Claim 11

A method of producing an improved frit-seal between the funnel and the flat faceplate of a tension-mask-type color cathode ray tube which seals tend to be more susceptible to failure than cathode ray tubes having a curvilinear faceplate due to the unusually high stresses created at the funnel-faceplate joint of such flat-faceplate tubes, said method comprising: providing a glass funnel having a predetermined sealing area and a flat glass faceplate having a predetermined sealing area adapted to mate with said funnel sealing area; applying to said sealing areas a viscous bead of cement comprised of a frit-based material characterized by having properties of high cohesion and poor wetting of glass; and mating said faceplate and funnel sealing areas and baking the assembled combination to harden said cement, said method being characterized by including the step prior to said applying said cement of applying a priming layer on at least one of said sealing areas composed of a material to which said frit cement has a high wetting affinity, the terminations of said priming layer being caused to lie in regions of low stress outside the faceplat-funnel interface, whereby the resultant faceplate-funnel joint has a substantially reduced or non-existent tendency to form re-entrant seals in the faceplate-funnel interface where stresses are high, thereby markedly reducing joint failures due to stress concentratoions in the joint region, and whereby any stress concentrations resulting from re-entrancies formed at said terminations of said layer, being in regions of low stress, are relatively harmless.

Claim 12

A method of producing an improved frit-seal between the funnel and the flat faceplate of a tension-mask-type color cathode ray tube which seals tend to be more susceptible to failure than cathode ray tubes having a curvilinear faceplate due to the unusually high stresses created at the funnel-faceplate joint of such flat-faceplate tubes, said method comprising: providing a glass funnel having a predetermined sealing area and a flat glass faceplate having a predetermined sealing area adapted to mate with said funnel sealing area; applying to said sealing areas a viscous bead of cement comprised of a frit-based material characterized by having properties of high cohesion and poor wetting of glass; and mating said faceplate and funnel sealing areas and baking the assembled combination to harden said cement, said method being characterized by including the step prior to said applying said cement of applying a priming layer on at least one of said sealing areas composed of a material to which said frit cement has a high wetting affinity, the terminations of said priming layer being caused to lie in regions of low stress outside the faceplat-funnel interface, whereby the resultant faceplate-funnel joint has a substantially reduced or non-existent tendency to form re-entrant seals in the faceplate-funnel interface where stresses are high, thereby markedly reducing joint failures due to stress concentratoions in the joint region, and whereby any stress concentrations resulting from re-entrancies formed at said terminations of said layer, being in regions of low stress, are relatively harmless.

Claim 17

A method of frit-sealing the funnel and the faceplate of a cathode ray tube, comprising: providing a glass funnel having a first sealing area and a glass faceplate having a second sealing area adapted to mate with said funnel sealing area; applying a first layer of frit-based sealing glass to said first sealing area and a second layer of said frit-based sealing glass to said second sealing area in a manner such that said frit-based sealing glass layers extend beyond said sealing areas, wherein said frit-based sealing glass is characterized as having properties of high cohesion and poor wetting of glass; applying an intermediate layer of said frit-based sealing glass to said first or said second layer of said frit-based sealing glass; and mating said respective first and second sealing areas of said funnel and said faceplate and baking the assembled combination to harden said frit-based sealing glass, wherein the terminations of said intermediate layer of said frit-based sealing glass lie in regions of low stress outside the faceplate-funnel interface, whereby the resultant faceplate-funnel joint has a substantially reduced or non-existent tendency to form re-entrant seals in the faceplate-funnel interface where stresses are high, thereby markedly reducing joint failures due to stress concentrations in the joint region, and whereby any stress concentrations resulting from re-entrancies formed at said terminations of said layer, being in regions of low stress, are relatively harmless.

Claim 18

A method of frit-sealing the funnel and the faceplate of a cathode ray tube, comprising: providing a glass funnel having a first sealing area and a glass faceplate having a second sealing area adapted to mate with said funnel sealing area; applying a first layer of frit-based sealing glass to said first sealing area and a second layer of said frit-based sealing glass to said second sealing area in a manner such that said frit-based sealing glass layers extend beyond said sealing areas, wherein said frit-based sealing glass is characterized as having properties of high cohesion and poor wetting of glass; applying an intermediate layer of said frit-based sealing glass to said first or said second layer of said frit-based sealing glass; and mating said respective first and second sealing areas of said funnel and said faceplate and baking the assembled combination to harden said frit-based sealing glass, wherein the terminations of said intermediate layer of said frit-based sealing glass lie in regions of low stress outside the faceplate-funnel interface, whereby the resultant faceplate-funnel joint has a substantially reduced or non-existent tendency to form re-entrant seals in the faceplate-funnel interface where stresses are high, thereby markedly reducing joint failures due to stress concentrations in the joint region, and whereby any stress concentrations resulting from re-entrancies formed at said terminations of said layer, being in regions of low stress, are relatively harmless.

Claim 22

A method of frit-sealing the shadow mask support structure and the faceplate of a cathode ray tube, comprising: providing a ceramic shadow mask support structure having a first sealing area and a glass faceplate having a second sealing area adapted to mate with said support structure sealing area; applying a first priming layer of frit-based sealing glass to said first sealing area and a second priming layer of said frit-based sealing glass to said second sealing area in a manner such that said frit-based sealing glass priming layers extend beyond said sealing areas, wherein said frit-based sealing glass is characterized as having properties of high cohesion and poor wetting of glass and ceramic; applying an intermediate layer of said frit-based sealing glass to said first or said second layer of said frit-based sealing glass; and mating said respective first and second sealing areas of said support structure and said faceplate and baking the assembled combination to harden said frit-based sealing glass, wherein the terminations of said priming layers lie in regions of low stress outside the shadow mask support structure-faceplate interface, whereby the resultant shadow mask support structure-faceplate joint has a substantially reduced or non-existent tendency to form re-entrant seals in the shadow mask support structure-faceplate interface where stresses are high, thereby markedly reducing joint failures due to stress concentrations in the joint region, and whereby any stress concentrations resulting from re-entrancies formed at said terminations and said priming layers, being in regions of low stress, are relatively harmless.

Claim 23

A method of frit-sealing the shadow mask support structure and the faceplate of a cathode ray tube, comprising: providing a ceramic shadow mask support structure having a first sealing area and a glass faceplate having a second sealing area adapted to mate with said support structure sealing area; applying a first priming layer of frit-based sealing glass to said first sealing area and a second priming layer of said frit-based sealing glass to said second sealing area in a manner such that said frit-based sealing glass priming layers extend beyond said sealing areas, wherein said frit-based sealing glass is characterized as having properties of high cohesion and poor wetting of glass and ceramic; applying an intermediate layer of said frit-based sealing glass to said first or said second layer of said frit-based sealing glass; and mating said respective first and second sealing areas of said support structure and said faceplate and baking the assembled combination to harden said frit-based sealing glass, wherein the terminations of said priming layers lie in regions of low stress outside the shadow mask support structure-faceplate interface, whereby the resultant shadow mask support structure-faceplate joint has a substantially reduced or non-existent tendency to form re-entrant seals in the shadow mask support structure-faceplate interface where stresses are high, thereby markedly reducing joint failures due to stress concentrations in the joint region, and whereby any stress concentrations resulting from re-entrancies formed at said terminations and said priming layers, being in regions of low stress, are relatively harmless.