Color cathode ray apparatus provided with dynamic convergence means

A color cathode ray apparatus comprising:

• a vacuum envelope;
• a phosphor screen formed in the envelope which includes a center region, horizontal side regions each arranged on either horizontal side of the center region, and vertical side regions each arranged on either vertical side of the center region;
• an electron gun assembly of the in-line type for emitting center and side electron beams to the phosphor screen;
• a shadow mask provided with a plurality of apertures and facing the phosphor screen to allow three electron beams to pass therethrough toward the phosphor screen;
• deflecting means arranged outside the envelope for generating vertical and horizontal magnetic fields to deflect the electron beams in horizontal and vertical directions, the horizontal magnetic field being of the barrel type;
• a static convergence means for correctly converging the three electron beams being applied to the horizontal side regions of the screen and allowing the three electron beams directed to the center region of the phosphor screen to have a weak convergence compared to the convergence of the beams applied to the horizontal side regions;
• and
• a dynamic convergence means for further converging the electron beams having weak convergence and being applied to the center region of the screen to correct the weak convergence in accordance with the horizontal deflection, so that the deflected electron beams are correctly converged all over the phosphor screen.