# US 4,400,644 A · Self-indexing insulating support rods for an electron gun assembly

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- Number: US 4,400,644 A
- Document ID: US4400644A
- Status: Granted
- Kind: A
- Application number: 06/258,740
- Filed: 1981-04-29
- Granted: 1983-08-23
- Earliest claimed: 1981-04-29
- Assignees: RCA Corporation
- Inventors: John R. Hale
- Web page: https://patentgrep.com/patent/US4400644A

## CPC

- H01J 29/485: {Construction of the gun or of parts thereof (H01J29/481, H01J29/482, H01J29/484 and H01J29/487 take precedence)}
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)

## Abstract

A novel electron gun assembly having at least one generally longitudinally-extending electron beam path includes a plurality of electrodes attached to at least two electrically-insulating support rods. Each of the support rods has a surface having at least two indexing cavities formed therein for aligning the support rods along the beam path.

## Claims

### Claim 1

In an electron-gun assembly having at least one generally longitudinally-extending electron beam path, said assembly comprising at least two elongated electrically-insulating support rods each rod having a mounting surface and a beading support surface with a plurality of electrodes attached by mounting means to said mounting surfaces of each of said support rods, the improvement wherein
at least two indexing cavities are formed in said beading support surface of each of said support rods, whereby said rods are aligned along said beam path.

### Claim 2

In an in-line electron gun assembly comprising
at least two elongated electrically-insulating support rods, each of said support rods being a parallelepiped member having a mounting surface and an oppositely disposed beading support surface,
a plurality of electrodes for producing and directing three electron beams along spaced coplanar paths having a common generally longitudinal direction, said electrodes being affixed to said mounting surface of each of said support rods, the improvement wherein
at least two indexing cavities are formed in said beading support surface of each of said support rods, whereby said rods are aligned along said beam paths.

### Claim 3 (depends on 2)

The electron gun assembly as in claim 2, wherein said indexing cavities are formed along the center line of the major axis of each of said support rods.

### Claim 4 (depends on 3)

The electron gun assembly as in claim 3, wherein at least one of said indexing cavities is elongated along the major axis of said support rod.

### Claim 5 (depends on 3)

The electron gun assembly as in claim 3, wherein one of said indexing cavities has a minimum surface area configuration and the second of said indexing cavities is elongated along the major axis of said support rod.