(19)
(11) EP 0 237 005 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
12.10.1988 Bulletin 1988/41

(43) Date of publication A2:
16.09.1987 Bulletin 1987/38

(21) Application number: 87103329

(22) Date of filing: 09.03.1987
(84) Designated Contracting States:
DE FR GB

(30) Priority: 11.03.1986 JP 5291786
15.10.1986 JP 24456286

(71) Applicant: Matsushita Electronics Corporation
 ()

(72) Inventors:
  • Suzuki, Hiroshi
     ()
  • Sugahara, Koichi
     ()
  • Fujisawa. Hidekuni
     ()

   


(54) cathode ray tube for color display


(57) An electron gun has a G2 electrode having a horizontally positioned oblong groove thereon and three aperturs for passing three electron beams, which are disposed on a bottom of said groove, and intensity of an electric field on the axis of each electron gun between the G2 electrode (12) and a G3 electrode, diameters of respective apertures of a G1 electrode (11), the G2 electrode (12) and the G3 electrode (13), distance interval between an emitter and the G1 electrode (11), between the emitter and the G2 electrode (12) and between the G, electrode (11) and the G2 electrode (12) are selected in a predetermined relation, and thereby a generation of moire image interference fringes are prevented.






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