(19)
(11) EP 0 326 428 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
28.03.1990 Bulletin 1990/13

(43) Date of publication A2:
02.08.1989 Bulletin 1989/31

(21) Application number: 89300848.2

(22) Date of filing: 27.01.1989
(51) International Patent Classification (IPC)4: B41J 2/18
(84) Designated Contracting States:
DE FR GB

(30) Priority: 27.01.1988 JP 16491/88
27.06.1988 JP 158321/88
23.01.1989 JP 13592/89

(71) Applicant: CANON KABUSHIKI KAISHA
Tokyo (JP)

(72) Inventors:
  • Terasawa, Koji
    Mitaka-shi Tokyo (JP)
  • Yamaguchi, Hideki
    Yokohama-shi Kanagawa-ken (JP)

(74) Representative: Beresford, Keith Denis Lewis et al
BERESFORD & Co. 2-5 Warwick Court High Holborn
London WC1R 5DJ
London WC1R 5DJ (GB)


(56) References cited: : 
   
       


    (54) Discharge recovery method for an ink jet recording head, recording head adopting the same method and ink jet recording apparatus adopting the same method


    (57) In a discharge recovery method for an ink jet recording head (1), a recording head having discharge openings for discharging ink therethrough, liquid paths (2) in which recording energy generating members (3) generating energy for discharging the ink through the discharge openings are provided and which communicate with the discharge openings, and a liquid chamber (4) communicating with the liquid paths (2) for supplying the ink to the liquid paths is used to drive heat energy generating (5) means provided in the liquid chamber for generating heat energy for causing a change in the state of the ink in the liquid chamber (4) and creating a bubble, during non-­recording, thereby causing the ink to be discharge through the discharge openings.







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