(19)
(11) EP 0 631 874 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
05.07.1995 Bulletin 1995/27

(43) Date of publication A2:
04.01.1995 Bulletin 1995/01

(21) Application number: 94109973.1

(22) Date of filing: 28.06.1994
(51) International Patent Classification (IPC)6: B41J 2/175
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB GR IE IT LI LU NL PT SE

(30) Priority: 29.06.1993 JP 159494/93
30.06.1993 JP 161790/93
30.06.1993 JP 161135/93
02.08.1993 JP 191379/93
03.09.1993 JP 219787/93
08.06.1994 JP 125965/94

(71) Applicant: CANON KABUSHIKI KAISHA
Ohta-ku Tokyo 146 (JP)

(72) Inventors:
  • Tajima, Hiroki, c/o Canon Kabushiki Kaisha
    Ohta-ku, Tokyo 146 (JP)
  • Kashino, Toshio, c/o Canon Kabushiki Kaisha
    Ohta-ku, Tokyo 146 (JP)
  • Higuma, Masahiko, c/o Canon Kabushiki Kaisha
    Ohta-ku, Tokyo 146 (JP)
  • Okazaki, Takeshi, c/o Canon Kabushiki Kaisha
    Ohta-ku, Tokyo 146 (JP)

(74) Representative: Kinne, Reinhard, Dipl.-Ing. 
Patentanwaltsbüro Tiedtke-Bühling-Kinne & Partner Bavariaring 4
80336 München
80336 München (DE)


(56) References cited: : 
   
       


    (54) An ink tank unit, an ink jet cartridge having said ink tank unit and an ink jet apparatus having said ink jet cartridge


    (57) An ink jet cartridge comprises an ink jet head unit (100) for discharging the ink, and an ink tank unit (200) having an ink supply port (209) for supplying the ink to the ink jet head unit. The ink tank unit has a partition portion (215) for partitioning between an ink storing portion (204) for storing the ink to be supplied to the ink jet head unit and a negative pressure generating member receiving portion (203) having a negative pressure generating member. The ink supply port (209) is provided on the negative pressure generating member receiving portion (203). And the partition portion (215) has an ink communicating portion at an end portion of the partitioning portion on the side of the negative pressure generating member receiving portion where the ink supply port (209) is provided, and makes contiguous the ink storing portion and the negative pressure generating member receiving portion in a movement direction of the ink tank unit (200) when discharging the ink.






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