Patent ID: 7450842

Claim:
A manufacturing method of a color cathode ray tube comprising a panel portion which includes a phosphor screen on which a black matrix film having a plurality of opening portions and three kinds of phosphor pixels which are arranged in the opening portions of the black matrix film are formed on an inner surface thereof, and a shadow mask which is arranged to face the phosphor screen formed on the inner surface of the panel portion and includes a large number of electron beam apertures, wherein a step for forming the black matrix film comprises an exposure step of first phosphor pixel holes, an exposure step of second phosphor pixel holes, and an exposure step of third phosphor pixel holes, in the exposure step of the first phosphor pixel holes, the exposure is performed by arranging a common correction lens and a first monochroic correction lens having an outer diameter smaller than an outer diameter of the common correction lens between the inner surface of the panel portion and the exposure light source, in the exposure step of the second phosphor pixel holes, the exposure is performed by arranging the common correction lens and a second monochroic correction lens having an outer diameter smaller than the outer diameter of the common correction lens between the inner surface of the panel portion and the exposure light source, and in the exposure step of the third phosphor pixel holes, the exposure is performed by arranging the common correction lens and a third monochroic correction lens having an outer diameter smaller than the outer diameter of the common correction lens between the inner surface of the panel portion and the exposure light source.