Color cathode ray tube having an improved electron gun electrode

• Main Authors: Miura, Masato, Mera, Takeshi
• Format: Patent
• Language: English
• Published: 13.05.2003

The present invention relates to a color cathode ray tube, and in particular to a cathode ray tube capable of improving withstand voltage characteristics and displaying high-resolution color images by ensuring of high precision of dimensions and shapes of cup-shaped electrodes among a plurality of electrodes of an electron gun housed in its vacuum envelope. A color cathode ray tube has a phosphor screen and an electron gun. The electron gun includes an electron beam generating section for emitting three in-line electron beams toward the phosphor screen and an electron beam focusing section for focusing the electron beams onto the phosphor screen. The electron beam focusing section includes at least one cup-shaped electrode having a tubular portion and a flange formed continuously from the tubular portion. The tubular portion has a generally rectangular cross section having an outwardly curved portion at each side thereof in a direction of arrangement of the three in-line electron beams in a plane perpendicular to the color cathode ray tube axis, the flange has a generally rectangular cross section having an outwardly curved portion at each side thereof in the direction of arrangement of the electron beams in the plane perpendicular to the color cathode ray tube axis, and the flange is formed with a locally thinned-down portion.