Claims
- 1. A method of utilizing a color selection electrode assembly as a stencil for screening a pattern of luminescent primary color elemental phosphor areas upon the target surface of an envelope section destined for use as a component of a color cathode ray tube,
- said envelope section having six-point rounded-element and-groove registration affording means and being formed of a material having a predetermined temperature coefficient of expansion, said electrode assembly comprising:
- a mount formed of a material having a temperature coefficient of expansion greater than that of said envelope section,
- said mount having a central opening of sufficient span to enable said mount to surround the periphery of said envelope section and having a foil tautly secured across said opening,
- said foil having a predetermined pattern of color selection apertures therein,
- said mount further having six-point rounded-element and-groove indexing means cooperable with said envelope section registration affording means,
- said method comprising the following steps:
- (a) applying a photosensitive coating to said target surface of said envelope section;
- (b) registering said mount with said envelope section to enable said foil to serve as a stencil by temporarily mating said indexing means of said mount with said registration affording means of said envelope section;
- (c) selectively locating a source of actinic light rays to expose said photosensitive coating through the pattern of apertures in said foil, said light source being so located as to mimic the position to be occupied by the electron beam subsequently employed to scan said pattern of phosphor areas;
- (d) interposing correction lens means between said source of actinic light rays and said registered mount to direct said rays through said foil apertures to impinge said photosensitive coating at points displace from where said rays would impinge said coating, absent said lens, to create on said target surface a latent image of said predetermined pattern of apertures corresponding in configuration to the electron exposure pattern on the screen produced through a similarly mounted, but expanded by tension, foil during tube operation;
- (e) removing said mount and said foil;
- (f) processing said exposed coating to establish a pattern of elemental phosphor areas corresponding to the aperture pattern that would have resulted from using an expanded foil, and
- (g) repeating said steps (a) through (g) for each pattern of elemental phosphor areas desired to be established.
- 2. The method of making a color cathode ray tube, which tube includes,
- a funnel having a sealing land,
- a faceplate having a pattern of luminescent primary color elemental phosphor areas deposited on a target surface thereof and further having a sealing land surrounding said target surface and geometrically matching said funnel sealing land, said faceplate sealing land having a plurality of alignment elements,
- and a color selection electrode arrangement comprising:
- an auxiliary mount defining a central opening and formed of a material having a temperature coefficient of expansion greater than that of said funnel or said faceplate,
- a taut apertured planar foil secured to said mount and having a temperature coefficient of expansion not greater than that of said mount, and
- indexing means borne by said mount and co-operable with said alignment elements of said faceplate,
- the method comprising the following steps:
- (a) applying a bead of frit to the sealing lands of said funnel and said faceplate;
- (b) positioning said color selection electrode upon said faceplate with said mount indexing means in registration with said faceplate alignment elements;
- (c) positioning said funnel upon said color selection electrode with said funnel sealing land in registration with said faceplate sealing land;
- (d) inserting the assemblage of said funnel, said color selection electrode and said faceplate in a heat chamber;
- (e) elevating the temperature of said chamber to expose said assemblage to a frit devitrifying temperature while, simultaneously, causing said faceplate, said mount, said foil and said funnel to expand by an amount determined by their characteristic temperature coefficients of expansion;
- (f) maintaining said assemblage at said frit devitrifying temperature until said foil is captivated between said funnel and said faceplate by devitrified frit;
- (g) cooling down said assemblage to room temperature to induce tension in said captivated foil;
- (h) severing said foil from said auxiliary mount to permit removal of said mount;
- (i) trimming any portion of said foil protruding from the junction of said frit sealed faceplate and funnel; and
- (j) coating any exposed edges of said foil with insulating material.
- 3. A method of manufacturing a tension mask color cathode ray tube, which includes a faceplate having a target surface and also having six-point rounded-element-and-groove registration affording provisions mechanically associated therewith, comprising:
- providing a mount having a central opening of sufficient span to encompass said target surface of said faceplate, a planar foil tautly secured on said mount across said mount opening, said foil having a predetermined pattern of color selection apertures therein, and six-point rounded-element-and-groove indexing means associated with said mount and adapted for direct mating with said faceplate registration affording provisions, that is without the intervention of an intermediate instrumentality;
- applying a photosensitive coating to said target surface of said faceplate;
- registering said mount with said faceplate to enable said foil to serve as a stencil by temporarily directly mating said indexing means associated with said mount with said registration affording provisions of said faceplate;
- selectively locating a source of actinic light rays and exposing said photosensitive coating through the pattern of apertures in said foil, said light source being so located as to mimic, approximately, the position to be occupied by the electron beam subsequently employed to scan said pattern of phosphor areas to be screened;
- interposing compensating lens means between said source of actinic light rays and said registered mount to direct said rays through said foil apertures to impinge said photosensitive coating at points displaced from where said rays would impinge said coating, absent said lens, to compensate for the fact that the trajectory of an electron beam deflection differs from the path of light ray originating from the same point source as the beam, to create on said target surface a latent image of said predetermined pattern of apertures;
- removing said mount and said foil;
- processing said exposed coating to establish a pattern of elemental phosphor areas corresponding to said predetermined pattern of apertures;
- repeating the previous steps for each pattern of elemental phosphor areas desired to be established; and
- re-registering said mount with said faceplate with said foil apertures in registration with said phosphor areas screened on said target surface of said faceplate and securing said foil to said faceplate.
- 4. In the manufacture of a tension mask color cathode ray tube, the method comprising:
- providing a faceplate having a target surface and having registration affording means disposed on the external periphery of the faceplate outside the CRT vacuum enclosure;
- providing a mount having a central opening of sufficient span to encompass said target surface of said faceplate, said mount having indexing means adapted for direct mating with said registration affording means on the external periphery of said faceplate;
- tautly securing across said opening in said mount a planar mask with a predetermined pattern of apertures therein; and
- photodepositing a pattern of phosphor elements on said target surface, including one or more times the step of using said mask as a photographic stencil while maintaining said mount and said faceplate in mutual registry by the mating of said indexing means on said mount with said registration affording means on the periphery of said faceplate, the mating of said indexing means and said registration affording means being direct, that is, without the intervention of an intermediate instrumentality.
- 5. In the manufacture of a tension mask color cathode ray tube, the method comprising:
- providing a faceplate having a target surface and having registration affording means disposed on the external periphery of the faceplate outside the CRT vacuum enclosure;
- providing a mount having a central opening of sufficient span to encompass said target surface of said faceplate, said mount having indexing means adapted for direct mating with said registration affording means on the external periphery of said faceplate;
- tautly securing across said opening in said mount a planar mask with a predetermined pattern of apertures therein; and
- securing said mask to said faceplate while maintaining said mount and said faceplate in mutual registry by the mating of said indexing means on said mount with said registration affording means on the periphery of said faceplate, the mating of said indexing means and said registration affording means being direct, that is, without the intervention of an intermediate instrumentality.
- 6. In the manufacture of a tension mask color cathode ray tube, the method comprising:
- providing a flat faceplate having a target surface and having six-point rounded-element-and-groove registration affording means disposed on the external periphery of the faceplate outside the CRT vacuum enclosure;
- providing a mount having a central opening of sufficient span to encompass said target surface of said faceplate, said mount having complementary six-point rounded-element-and-groove indexing means adapted for direct mating with said six-point rounded-element-and-groove registration affording means on the external periphery of said faceplate;
- tautly securing across said opening in said mount a planar foil mask with a predetermined pattern of apertures therein;
- securing said mask to said faceplate while maintaining said mount and said faceplate in mutual registry by the mating of said indexing means on said mount with said registration affording means on the periphery of said faceplate, the mating of said indexing means and said registration affording means being direct, that is, without the intervention of an intermediate instrumentality; and
- severing said mask from said mount to leave said mask affixed to said faceplate.
- 7. In the manufacture of a tension mask color cathode ray tube, the method comprising:
- providing a faceplate having a target surface and having registration affording means disposed on the external periphery of the faceplate outside the CRT vacuum enclosure;
- providing a mount having a central opening of sufficient span to encompass said target surface of said faceplate, said mount having indexing means adapted for direct mating with said registration affording means on the external periphery of said faceplate;
- tautly securing across said opening in said mount a planar mask with a predetermined pattern of apertures therein;
- photodepositing a pattern of phosphor elements on said target surface, including one or more times the step of using said mask as a photographic stencil while maintaining said mount and said faceplate in mutual registry by the mating of said indexing means on said mount with said registration affording means on the periphery of said faceplate, the mating of said indexing means and said registration affording means being direct, that is, without the intervention of an intermediate instrumentality; and
- subsequently rigidly supportively coupling said mask to said faceplate while again maintaining said mount and said faceplate to mutual registry by the mating of said indexing means on said mount with said registration affording means on said faceplate to cause said pattern of apertures in said mask to be registered with said pattern of phosphor elements on said faceplate.
- 8. In the manufacture of a tension mask color cathode ray tube, the method comprising:
- providing a flat faceplate having a target surface and having six-point rounded-element-and-groove type registration affording means disposed on the external periphery of the faceplate outside the CRT vacuum enclosure;
- providing a mount having a central opening of sufficient span to encompass said target surface of said faceplate, said mount having complementary six-point rounded-element-and-groove indexing means adapted for mating with said six-point rounded-element-and-groove registration affording means on the external periphery of said faceplate, the mating of said indexing means and said registration affording means being direct, that is, without intervention of an intermediate instrumentality;
- tautly securing across said opening in said mount a planar foil mask with a predetermined pattern of aperture therein;
- photodepositing a pattern of phosphor elements on said target surface, including one or more times the step of using said mask as a photographic stencil while maintaining said mount and said faceplate in mutual registry by the mating of said six-point rounded-element-and-groove indexing means on said mount with said six-point rounded-element-and-groove registration affording means on the periphery of said faceplate;
- subsequently rigidly supportively coupling said mask to said faceplate while again maintaining said mount and said faceplate in mutual registry by the mating of said six-point rounded-element-and-groove indexing means on said mount with said six-point rounded-element-and-groove registration affording means on said faceplate and, while doing that, securing said mask to said faceplate; and
- severing said mask from said mount to leave said mask affixed to said faceplate with said pattern of apertures in said mask registered with said pattern of phosphor elements on said faceplate.
- 9. In the manufacture of a tension mask color cathode ray tube, the method comprising:
- providing a faceplate having a target surface and having removable registration affording means disposed on the external periphery of the faceplate outside the CRT vacuum enclosure;
- providing a mount having a central opening of sufficient span to encompass said target surface of said faceplate, said mount having indexing means adapted for direct mating with said removable registration affording means on the external periphery of said faceplate;
- tautly securing across said opening in said mount a planar mask with a predetermined pattern of apertures therein;
- photodepositing a pattern of phosphor elements on said target surface, including one or more times the step of using said mask as a photographic stencil while maintaining said mount and said faceplate in mutual registry by the mating of said indexing means on said mount with said removable registration affording means on the periphery of said faceplate, the mating of said indexing means and said registration affording means being direct, that is, without the invention of an intermediate instrumentality; and
- removing said registration affording means from the periphery of said faceplate.
- 10. In the manufacture of a tension mask color cathode ray tube, the method comprising:
- providing a faceplate having a target surface and having removable registration affording means disposed on the external periphery of the faceplate outside the CRT vacuum enclosure,
- providing a mount having a central opening of sufficient span to encompass said target surface of said faceplate, said mount having indexing means adapted for direct mating with said removable registration affording means on the external periphery of said faceplate;
- tautly securing across said opening in said mount a planar mask with a predetermined pattern of apertures therein;
- rigidly supportively coupling said mask to said faceplate while maintaining said mount and said faceplate in mutual registry by the mating of said indexing means on said mount with said removable registration affording means on the periphery of said faceplate, the mating of said indexing means and said registration affording means being direct, that is, without the intervention of an intermediate instrumentality; and
- removing said registration affording means from the periphery of said faceplate.
- 11. In the manufacturing of a tension mask color cathode ray tube, the method comprising:
- providing a faceplate having a target surface and having removable registration affording means disposed on the external periphery of the faceplate outside the CRT vacuum enclosure;
- providing a mount having a central opening of sufficient span to encompass said target surface of said faceplate, said mount having indexing means adapted for direct mating with said removable registration affording means on the external periphery of said faceplate;
- tautly securing across said opening in said mount a planar mask with a predetermined pattern of apertures therein;
- photodepositing a pattern of phosphor elements on said target surface, including one or more times the step of using said mask as a photographic stencil while maintaining said mount and said faceplate in mutual registry by the mating of said indexing means on said mount with said removable registration affording means on the periphery of said faceplate, the mating of said indexing means and said registration affording means being direct, that is, without the intervention of an intermediate instrumentality;
- subsequently rigidly supportively coupling said mask to said faceplate while again maintaining said mount and said faceplate in mutual registry by the direct mating of said indexing means on said mount with said removable registration affording means on said faceplate; and
- removing said registration affording means from the periphery of said faceplate.
- 12. In the manufacture of a tension mask color cathode ray tube, the method comprising:
- providing a flat faceplate having a target surface and having removable six-point rounded-element-and-groove registration affording means disposed on the external periphery of the faceplate outside the CRT vacuum enclosure;
- providing a mount having a central opening of sufficient span to encompass said target surface of said faceplate, said mount having complementary six-point rounded-element-and-groove indexing means adapted for direct mating with said removable six-point rounded-element-and-groove registration affording means on the external periphery of said faceplate;
- tautly securing across said opening in said mount a planar foil mask with a predetermined pattern of apertures therein;
- photodepositing a pattern of phosphor elements on said target surface, including one or more times the step of using said mask as a photographic stencil while maintaining said mount and said faceplate in mutual registry by the mating of said six-point rounded-element-and-groove indexing means on said mount with said removable six-point rounded-element-and-groove registration affording means on the periphery of said faceplate, the mating of said indexing means and said registration affording means being direct, that is, without the intervention of an intermediate instrumentality;
- subsequently securing said mask to said faceplate while again maintaining said mount and said faceplate in mutual registry by the direct mating of said six-point rounded-element-and-groove indexing means on said mount with said removable six-point rounded-element-and-groove registration affording means on said faceplate;
- severing said mask from said mount to leave said mask affixed to said faceplate with said pattern of apertures in said mask registered with said pattern of phosphor elements on said faceplate; and
- removing said registration affording means from the periphery of said faceplate.
Parent Case Info
This application is a division of application Ser. No. 801,119, filed Nov. 22, 1985, now U.S. Pat. No. 4,723,089, which is a division of application Ser. No. 538,003, filed Sept. 30, 1983, now abandoned.
US Referenced Citations (14)
Divisions (2)
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Number |
Date |
Country |
Parent |
801119 |
Nov 1985 |
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Parent |
538003 |
Sep 1983 |
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