| 摘要 |
IN A COLOR CATHODE RAY TUBE APPARATUS INCLUDING AN ELECTRON GUN ASSEMBLY (26) HAVING A MAIN ELECTRON LENS SECTION FOR FOCUSING AND CONVERYING THREE ELECTRON BEAMS ARRANGED IN A LINE ON A PHOSPHOR SCREEN, THREE ELECTRON BEAM THROUGH HOLES ARRANGED IN A LINE IN THE ARRANGEMENT DIRECTION OF THE THREE ELECTRON BEAMS ARE FORMED IN EACH OF THE OPPOSING SURFACES OF THE FIRST ELECTRODE (G3) HAVING A RELATIVELY LOW POTENTIAL AND A SECOND ELECTRODE (G4) HAVING A RELATIVELY HIGH POTENTIAL, WHICH ELECTRODES CONSTITUDE THE MAIN ELECTRON LENS SECOND AND SUBSTANTIALLY OPPOSE, THE PAIR OF SIDE BEAM THROUGH HOLES OF THE SECOND ELECTRODE ARE DECENTERED OUTWARD IN THE ARRANGEMENT DIRECTION OF THE THREE ELECTRON BEAMS WITH RESPECT TO THE PAIR OF SIDE BEAM THROUGH HOLES OF THE FIRST ELECTRODE, AND EACH OF THEPAIR OF SIDE BEAM THROUGH HOLES OF ANY ONE OF THE FIRST AND SECOND ELECTRODES IS FORMED TO HAVE A SUBSTANTIALLY HORIZONTALLY ELONGATED SHAPE IN WHICH BOTH SIDES IN THE ARRANGEMENT DIRECTION OF THE THREE ELECTRON BEAMS ARE CONSTITUTED BY ARCS AND THE LENGTH OF THE INNER AND OUTER ARCS IN THE ARRANGEMENT DIRECTION OF THE THREE ELECTRON BEAMS IS DEFFERENT FROM THAT OF THE OUTER ARC. THE THREE ELECTRON BEAMS CAN BE PROPERLY FOCUSED TO OBTAIN GOOD IMAGE CHARACTERISTICS ON AN ENTIRE SCREEN.(FIG 7)
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