(19)
(11) EP 0 427 235 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
25.09.1991 Bulletin 1991/39

(43) Date of publication A2:
15.05.1991 Bulletin 1991/20

(21) Application number: 90121309.0

(22) Date of filing: 07.11.1990
(51) International Patent Classification (IPC)5: H01J 29/48, H01J 29/50
(84) Designated Contracting States:
DE FR GB

(30) Priority: 09.11.1989 JP 289970/89
12.10.1990 JP 272247/90

(71) Applicant: KABUSHIKI KAISHA TOSHIBA
Kawasaki-shi, Kanagawa-ken 210 (JP)

(72) Inventors:
  • Tokita, Kiyoshi, c/o Intellectual Property Div.
    Tokyo 105 (JP)
  • Fujiwara, Takeshi, c/o Intellectual Property Div.
    Tokyo 105 (JP)
  • Koshigoe, Shinpei, c/o Intellectual Property Div.
    Tokyo 105 (JP)
  • Hasegawa, Takahiro, c/o Intellectual Property Div.
    Tokyo 105 (JP)

(74) Representative: Henkel, Feiler, Hänzel & Partner 
Möhlstrasse 37
81675 München
81675 München (DE)


(56) References cited: : 
   
       


    (54) Color cathode ray tube apparatus and method for driving the same


    (57) The electron gun assembly (64) of a color cathode ray tube apparatus (50) comprises a cathode, and a group of electrodes which jointly form at least one electron lens. The power of this electron lens changes in synchronism with the deflection of electron beams at different change rates during one scanning period.







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