Method of fabricating electrode of color picture tube electron g

Details Method of fabricating electrode of color picture tube electron g Method of fabricating electrode of color picture tube electron g

1989-05-15

1990-04-24

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

Electrode making

H01J 902

Patent

active

049196340

ABSTRACT:
A method of fabricating an electrode of a color picture tube electron gun, the electrode having an aperture for passing an electron beam and having a recess formed in a surface of a single metal plate, comprises the steps of forming in the metal plate a laterally elongated through hole being substantially symmetrical with the axis of the electron beam pass aperture and having a major diameter in a longitudinal direction of the recess, before the recess is formed, forming the recess at a peripheral wall area of the laterally elongated through hole through a coining process, and forming the electron beam pass aperture by removing a wall portion of the through hole existing after completion of the coining process to form a through hole of a predetermined shape.

REFERENCES:
patent: 4366414 (1982-12-01), Hatayama et al.
patent: 4645469 (1987-02-01), Collins et al.

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