Color cathode ray tube and method manufacturing the same

A method of manufacturing a shadow mask having multiple electron beam apertures, each of the electron beam apertures having a smaller opening open to a first surface of the shadow mask and a larger opening open to a second surface of the shadow mask, the larger opening having an open area larger than an open area of the smaller opening, the method comprising the step of:

• forming a first resist film having a printing pattern on a first surface of a mask material, the printing pattern having a first pattern including dot patterns corresponding to positions where smaller openings are to be formed, and a second pattern including an independent subpattern provided with a predetermined gap around the dot patterns;
• and
• etching the mask material through the first resist film to form smaller openings corresponding to the first pattern and bulging portions corresponding to the second pattern.

A method of manufacturing a shadow mask, the method comprising the steps of:

• forming a first resist film having a printing pattern on a first surface of a mask material, the printing pattern having a first pattern including dot patterns corresponding to positions where smaller openings are to be formed, and a second pattern including an independent subpattern provided with a predetermined gap around the dot patterns;
• and
• etching the mask material through the first resist film to form smaller openings corresponding to the first pattern and bulging portions corresponding to the second pattern.