# US 4,392,914 A · Method for manufacturing mask for color CRT

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- Number: US 4,392,914 A
- Document ID: US4392914A
- Status: Granted
- Kind: A
- Application number: 06/413,896
- Filed: 1982-09-01
- Granted: 1983-07-12
- Earliest claimed: 1981-09-10
- Assignees: Tokyo Shibaura Denki Kabushiki Kaisha
- Inventors: Shigeo Takenaka; Eiji Kamohara; Kazuyuki Seino
- Web page: https://patentgrep.com/patent/US4392914A

## CPC

- H01J 29/81: using shadow masks
- H01J 9/142: {of shadow-masks for colour television tubes}
- Y10T 156/1043: Subsequent to assembly
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method for manufacturing a mask for a color CRT. The mask comprises a plurality of mask members having a number of apertures for passing electron beems, and being spaced apart. The mask is produced by the steps of bringing the mask members into tight contact with an insulator interposed between their peripheries; fixing them by an adhesive; press forming the entire composite; melting the adhesive; and shifting apart and fixing the mask members at a predetermined distance.

## Claims

### Claim 1

A method for manufacturing a mask for a color CRT in which a plurality of flat mask members each of which has a number of apertures in an effective area thereof are formed, and the plurality of mask members are fixed at predetermined distances with the apertures thereof being aligned with each other, comprising the steps of:
bringing into tight contact and fixing in position at least parts of said effective areas which have said apertures of said flat mask members with an insulator interposed between peripheral portions surrounding said effective areas of said plurality of flat mask members;
press forming said plurality of flat mask members to provide a predetermined radius of curvature thereto; and
fixing said effective areas in position at said predetermined distances after shifting apart said plurality of mask members.

### Claim 2 (depends on 1)

A method according to claim 1, wherein said insulator is formed in said peripheral portion of at least one of said mask members by etching said peripheral portion, a thickness of said insulator being substantially equal to a thickness of an etched portion.

### Claim 3 (depends on 1, 2)

A method according to claim 1 or 2, wherein said insulator comprises a polyimide resin.

### Claim 4 (depends on 1, 2)

A method according to claim 1 or 2, wherein said insulator comprises frit glass.

### Claim 5 (depends on 1)

A method according to claim 1, wherein said effective areas are fixed in position by filling paraffin in said apertures.

### Claim 6 (depends on 1)

A method according to claim 1, wherein said effective areas are fixed in position by an adhesive.

### Claim 7 (depends on 1)

A method according to claim 1, wherein said mask comprises two mask members.

### Claim 8 (depends on 1)

A method according to claim 1, said insulator has a heat resistance to withstand a temperature of 400.degree. to 500.degree. C.

### Claim 9 (depends on 1)

A method according to claim 1, wherein the press formation step comprises bending of an intermediate portion of an insulator formation part.