| 摘要 |
PROBLEM TO BE SOLVED: To restrict the deteriorating convergence of electron beams after starting operation. SOLUTION: The color picture tube comprises an envelope 10 to which a panel 11, a funnel 12 and a neck 13 are connected in series, a fluorescence screen 14 formed on a measuring area inside the panel, a conductive film 17 formed on the inner face of the funnel, and an electron gun 16 provided in the neck for emitting plural electron beams for excitation of luminescence of the fluorescence screen. A window portion 18 having no conductive film formed is partially provided on the inner face of the funnel.
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