Color cathode ray tube

An aperture grill for a color cathode ray tube, comprising:

• a plurality of grill tapes provided in parallel to each other between an upper part and a lower part of said aperture grill, a plurality of slits provided between two adjacent grill tapes, an inside stress of a center grill tape expressed by .alpha., a length of said grill tape provided at a center of said aperture grill expressed by L.sub.0, a grill tape pitch of said aperture grill expressed P.sub.ag ;
• and
• wherein an inside stress of said center grill tape is expressed by the following formula:
• .alpha.>(L.sub.0 /P.sub.ag).sup.0.725 *(1.329*10.sup.-2 *L.sub.0 +5.354)*10.sup.-2
• wherein the inside stress of said center grill tape is the smallest stress level in a stress distribution of inside stress levels for said grill tapes.

A color cathode ray tube having an electron beam source, comprising:

• a glass panel having a plurality of fluorescent stripes thereon and a plurality of black stripes located between two adjacent fluorescent stripes;
• an aperture grill located between said electron beam source and said glass panel, a plurality of grill tapes provided in parallel to each other between an upper part and a lower part of said aperture grill, a plurality of slits provided between two adjacent grill tapes, an inside stress of said grill tape expressed by .alpha., a length of said grill tape provided at a center of said aperture grill expressed by L.sub.0, a grill tape pitch of said aperture grill expressed P.sub.ag ;
• wherein an electron beam emitting from said electron beam source goes through said slit to cause said fluorescent stripe radiate, a relation among said inside stress of said grill tape, said length of said grill tape provided at said center of said aperture grill and said grill tape pitch of said aperture grill is expressed by a formula
• .alpha.>(L.sub.0 /P.sub.ag).sup.0.725 *(1.329*10.sup.-2 *L.sub.0 +5.354)*10.sup.-2.