Color cathode ray tube and method for manufacturing the same display screen for color

A method for manufacturing a display screen for a color cathode-ray tube, characterized in that a correction lens is formed with a plurality of adjacent planar or curved faces, level differences between the adjacent planar or curved faces are set to be not greater than 55 .mu.m, exposure light passed through said correction lens during vibration of the correction lens is irradiated through a shadow mask on a photosensitive film on an inner surface of a face panel for a color cathode-ray tube for light exposure thereof to form a fluorescent dot pattern on the face panel with the light-exposed photosensitive film used as a mask, whereby the face panel forms at least part of the display screen for the color cathode-ray tube and the display screen is made of said fluorescent dot pattern having at least 1,000,000 pixels and having a luminosity fluctuation factor which is not greater than .+-.0.15%.

A method for manufacturing a display screen for a color cathode-ray tube, characterized in that a correction lens is provided with a plurality of planar or curved faces, exposure light is irradiated on said correction lens during vibration of the correction lens to cause uniform generation of a width of a latticed light/dark line or dark line pattern produced by the planar or curved faces during light exposure and a contrast thereof all over an light exposure surface, said exposure light passed through the correction lens is irradiated on a shadow mask positioned at a front of a face panel for said color cathode-ray tube, said exposure light passed through the shadow mask is directed to a fluorescent film on said face panel for light exposure to form a fluorescent dot pattern on said face panel which form at least part of the display screen for the color cathode-ray tube, said display screen being made of said fluorescent dot pattern with at least 1,000,000 pixels, and said display screen having a luminosity fluctuation factor which is not greater than .+-.0.15%.

A method for manufacturing a display screen for a color cathode-ray tube comprising the steps of:

• uniformly generating a width of a latticed light/dark line or dark line pattern produced by planar or curved faces during light exposure of a correction lens provided with a plurality of planar or curved faces and provided with a surface having a level difference formed parallel to an incidence direction of an exposure light;
• and
• irradiating the exposure light on a shadow mask positioned at a front of a face panel for the cathode-ray tube during vibration of the correction lens so that the exposure light which passed through the shadow mask is directed to a fluorescent film on the face panel for light exposure to form a fluorescent dot pattern on the face panel forming at least part of the display screen for the color cathode-ray tube, the display screen being made up of the fluorescent dot pattern having at least 1,000,000 pixels, and the display screen having a luminosity fluctuation factor which is not greater than .+-.0.15%.