| 摘要 |
PROBLEM TO BE SOLVED: To correct the aberration of an electronic lens by forming inline three electron beam passing holes having an independent small aperture, and installing an inner electrode member containing a blade extending in the moving direction of electron beams, in order to correct focusing voltage difference producing with large aperture electron passing hole, at the edge of each electron beam passing hole. SOLUTION: First and second focusing electrodes are installed on the inside of outside rim electrode members 62, 72 in which large aperture electron passage holes 61, 71 through which each three electron beams are passed are formed. Inner electrode members 63, 73 for forming independent electron beam passing holes 63R, 63G, 63B, 73R, 73G, 73B are installed. By shifting the horizontal centers of small aperture electron bream passing holes of the inner electrode members 63, 73, convergence characteristics between three electron breams are corrected.
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