| 摘要 |
An electron gun for a cathode ray tube includes a single cathode that emits thermions; first and second electrodes; a plurality of focus electrodes provided consecutively after the second electrode; an anode electrode mounted after a final focus electrode; and a support that supports the electrodes in an aligned configuration. The final focus electrode and the anode electrode are mounted opposing one another with a predetermined gap therebetween. If a lengthwise direction of phosphor layers forming a phosphor screen of the cathode ray tube is a Y axis direction, and a direction perpendicular to the Y axis direction is an X axis direction, an electron beam aperture formed in a portion of the final focus electrode opposing the anode electrode, and an electron beam aperture formed in the anode electrode have diameters in the X axis direction that are larger than corresponding diameters of electron beam apertures formed in the remaining electrodes.
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