Electron gun assembly and cathode ray tube apparatus

An electron gun assembly having an electron beam generating section which generates three electron beams arranged in a horizontal direction and a main lens which accelerates the electron beams and focus them onto a target, wherein the electron beam generating section includes three cathodes arranged in the horizontal direction and each having an electron emitting surface, a first electrode, and a second electrode, and the surface of each of the cathodes is divided into at least three regions of first, second and third regions which are different in electron emission capability, the first region being arranged in the center of the surface of the cathode, the second region being arranged on opposite sides of the first region in the horizontal direction, and the third region being arranged on opposite sides of the first region in the vertical direction perpendicular to the horizontal direction.

A cathode ray tube apparatus including an electron gun assembly having an electron beam generating section which generates three electron beams in a horizontal direction and a main lens which accelerates the electron beams and focus them onto a phosphor screen, deflection yoke which deflects the three electron beams to scan across the phosphor screen in the horizontal and vertical directions, and velocity modulation coil which modulates the velocity of the electron beams, wherein the electron beam generating section includes three horizontally aligned cathodes and each having an electron emitting surface, a first electrode, and a second electrode which are arranged in this order in the direction in which the electron beams travel, and the surface of each of the cathodes is divided into at least three regions of first, second and third regions which have different electron emission capabilities, the first region being arranged in the center of the surface of the cathode, the second region being arranged on opposite sides of the first region in the horizontal direction, and the third region being arranged on opposite sides of the first region in the vertical direction.

An electron gun assembly having an electron beam generating section which generates an electron beam and a main lens which accelerates the electron beam and focus it onto a target, wherein the electron beam generating section includes a cathode having an electron emitting surface, a first electrode, and a second electrode which are arranged in this order in the direction in which the electron beam travels, the first electrode is formed with openings for correcting electric fields produced by the electron generating section, and the surface of the cathode is divided into at least three regions of first, second and third regions which have different electron emission capabilities, the first region being arranged in the center of the surface of the cathode, the second region being arranged on opposite sides of the first region in a first direction, and the third region being arranged on opposite sides of the first region in a second direction.

A cathode ray tube apparatus including an electron gun assembly having an electron beam generating section which generates three electron beams in a horizontal direction and a main lens which accelerates the electron beams and focus them onto a phosphor screen, deflection yoke which deflects the three electron beams to scan across the phosphor screen in the horizontal and vertical directions, wherein the electron beam generating section includes three horizontally aligned cathodes and each having an electron emitting surface, a first electrode, and a second electrode which are arranged in this order in the direction in which the electron beams travel, the first electrode is formed with openings for correcting electric fields produced by the electron generating section, and the surface of each of the cathodes is divided into at least three regions of first, second and third regions which have different electron emission capabilities, the first region being arranged in the center of the surface of the cathode, the second region being arranged on opposite sides of the first region in the horizontal direction, and the third region being arranged on opposite sides of the first region in the vertical direction.