| 摘要 |
PROBLEM TO BE SOLVED: To restrain the influence of a defect such as faulty etching or deformation in a color selecting mechanism to the utmost even when the defect occurs in the color selecting mechanism in the case of radiating ultraviolet rays to the inner surface of a face panel through the color selecting mechanism in the fluorescent surface manufacturing stage of a cathode ray tube. SOLUTION: By arranging a shielding plate 15 having an aperture 16 through which the ultraviolet rays are transmitted between the color selecting mechanism 2 and an ultraviolet light source 12 radiating the ultraviolet rays, the sharpness of an irradiation pattern formed on the inner surface of the face panel 1 of the cathode ray tube is adjusted according to the size of the aperture 16 in the case of radiating the ultraviolet rays to the inner surface of the face panel 1 of the cathode ray tube through the color selecting mechanism 2.
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