EXPOSING METHOD

PURPOSE:To produce a high quality color cathode-ray tube having circumferential brightness comparable with central brightness by moving the exposing light source continually or continuously by specific distance along the axis of tube then performing exposure without deteriorating the light output at the position having large deflection angle. CONSTITUTION:When exoposing the film formed on the inner face of panel 3 through shadowmask 4 to form a non-reflection layer, the light source 7 for producing the exposing light beam 8 is moved by specific distance along the axis 9 of color cathode-ray tube. Consequently, the incident angle of exposing light beam 8 to the hole of shadowmask 4 is varied to achieve desired hole area of black matrix at the position having large deflection angle. In other word, the hole 13 of black matrix is elongated by (L) when compared with conventinal one to increase the light output of color cathode-ray tube. The light source 7 may be moved only one time from predetermined position 16 to the moving position 17 or may be reciprocated.