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EP0081329A2
Expired / Lapsed
EP
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Method of making a two mask structure for cathode ray tube
Assignee: Toshiba Corp
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Filing: 1982-11-26
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Granted: —
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Expires: 2002-11-26
Abstract
Abstract The invention discloses a method of making a mask structure Including two or more masks for a colour cathode ray tube, for example, a mask focusing colour cathode ray tube. A plurality of apertured flat masks, each mask having an effective portion having apertures and non-effective portion surrounding the effective portion, are aligned and stacked with a predetermined gap between them. The gap is then filled with filling material which solidifies, thereby fixing the flat masks together. The fixed masks are simultaneously pressed into a predetermined curved shape. The filling material is then removed from the curved masks.
Inventors
- 👤 Eiji C/O Patent Division Kamohara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 12:09
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/14; H01J9/142; H01J29/00; H01J29/02; H01J9/18; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4981; Y10T29/49812
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
98 words
A method of making a mask structure for a cathode ray tube characterised in that it comprises the steps of: arranging two flat masks, each mask comprising an effective portion having a plurality of apertures therethrough and a non-effective portion surrounding said effective portion, in parallel spaced apart relation with corresponding apertures aligned; filling said apertures of said flat masks and space between the masks with pourable filling material; solidifying said filling material, thereby fixing said flat masks together; simultaneously pressing said fixed flat masks into a predetermined curvature; and removing said filling material from said curved masks.
Claim 2
Independent Claim
98 words
A method of making a mask structure for a cathode ray tube characterised in that it comprises the steps of: arranging two flat masks, each mask comprising an effective portion having a plurality of apertures therethrough and a non-effective portion surrounding said effective portion, in parallel spaced apart relation with corresponding apertures aligned; filling said apertures of said flat masks and space between the masks with pourable filling material; solidifying said filling material, thereby fixing said flat masks together; simultaneously pressing said fixed flat masks into a predetermined curvature; and removing said filling material from said curved masks.
Claim 3
Dependent Claim
26 words
A method of making a mask structure according to claim 1, characterised in that it includes the step of disposing a spacer between said flat masks.
Claim 4
Dependent Claim
42 words
A method of making a mask structure according to claim 2, characterised in that said step includes disposing a first spacer between said non-effective portions of said flat masks and disposing a second spacer between said effective portions of said flat masks.
Claim 5
Dependent Claim
23 words
A method of making a mask structure according to claim 3, characterised in that the second spacers are in the form of wires.
Claim 6
Dependent Claim
25 words
A method of making a mask structure according to claim 3 or 4, characterised in that said second spacer is removed after said solidifying step.
Claim 7
Dependent Claim
26 words
A method of making a mask structure according to claim 5, characterised in that the second spacer is removed after said removal of the filling material.
Claim 8
Independent Claim
39 words
A method of making a mask structure according to any preceding claim, characterised in that the filling material comprises at least one material selected from the group consisting of phenol resin, epoxy resin, polyvinyl resin, paraffin, gelatin and varnish.
Claim 9
Dependent Claim
31 words
A method of making a mask structure according to claim 1, characterised in that the two masks are secured in the required relation between said pressing step and said removing step.
Claim 10
Dependent Claim
30 words
A method of making a mask structure according to claim 1, characterised in that said removing step comprises the step of removing said filling material by heat or chemical treatment.
Claim 11
Dependent Claim
18 words
A mask structure for a cathode ray tube manufactured by a method as claimed in any preceding claim.
References Cited (Backward Citations)
No citation records indexed.
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