# US 5,702,280 A · Color selecting electrode mounting frame for CRT and process for production of same

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- Number: US 5,702,280 A
- Document ID: US5702280A
- Status: Granted
- Kind: A
- Application number: 08/529,212
- Filed: 1995-09-15
- Granted: 1997-12-30
- Earliest claimed: 1993-09-27
- Assignees: Sony Corporation
- Inventors: Yoshiro Horiuchi
- Web page: https://patentgrep.com/patent/US5702280A

## CPC

- H01J 9/142: {of shadow-masks for colour television tubes}
- H01J 29/073: {Mounting arrangements associated with shadow masks}
- H01J 2229/0722: Frame
- H01J 2229/0761: Uniaxial masks having parallel slit apertures, i.e. Trinitron type
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)

## Abstract

A color selecting electrode mounting frame of a CRT which eliminates the waste of materials, is easy and inexpensive to process and assemble. The color selecting electrode mounting frame for a CRT comprises a pair of long members of an L-sectional shape having curved surfaces formed at their top edge portions to which two opposing sides of a color selecting electrode are attached and a pair of short members having end portions joined to the two ends of these long members. The long members are obtained by blanking a plate of a fixed width into an arc shape of a predetermined curvature, then forming this into an L-sectional shape and a curvature matching the panel glass surface of the CRT. The two end portions of the short members are processed to match the curvature of the two end portions of the long members. The end portions of the short members are processed by a twisting, crushing, or shaving process.

## Claims

### Claim 1

A process for the production of a color selecting electrode mounting frame for a CRT comprising the steps of Forming a pair of long members, wherein each of said long members is produced by the following steps:
blanking a plate of a fixed width into an arc of a predetermined curvature to form an arc-shaped member,
forming the arc-shaped member into an L-sectional shape having a top edge portion and having a curvature which matches a panel glass surface of the CRT and forming on the top edge portion a curved surface on which one of two opposing sides of a color selecting electrode is attached; and
arranging said pair of said long members in parallel and joining a respective pair of short members to the bottoms of the two ends of each of said long members so as to bridge the ends of said long members.

### Claim 2 (depends on 1)

The process for production of a color selecting electrode mounting frame for a CRT as set forth in claim 1, further comprising a step of coining the bottom edge portions of said long members to form single-sided tapers of not more than 40 percent of the thickness of said long members.

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

The process for production of a color selecting electrode mounting frame for a CRT as set forth in claim 1 or claim 2, further comprising a step of forming step-shaped projections at the substantial center portions of said shore members so as to adjust the heights from said curved surfaces of said long members to the bottom surfaces of said short members.

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

The process for production of a color selecting electrode mounting frame for a CRT as set forth in claim 1 or claim 2, further comprising a step of crushing the mating surfaces of said long members with said short members so as to become flat surfaces.

### Claim 5 (depends on 1, 2)

The process for production of a color selecting electrode mounting frame for a CRT as see forth in claim 1 or claim 2, further comprising a step of processing the two end portions of each of said short members so as to match the curvature of the two end portions of said long members.

### Claim 6 (depends on 5)

The process for production of a color selecting electrode mounting frame for a CRT as set forth in claim 5, further comprising a step of processing the end portions of said short members to match the curvature of the two end portions of each of said long members by any one of a twisting, crushing, and shaving process.