Ink cartridge, ink eject unit having same and ink jet apparatus having ink jet unit

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EP 0 625 424 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	26.04.1995 Bulletin 1995/17

(43)	Date of publication A2:
	23.11.1994 Bulletin 1994/47

(21)	Application number: 94107959.2

(22)	Date of filing: 24.05.1994

(51)	International Patent Classification (IPC)⁵: B41J 2/175, B41J 2/17

(84)	Designated Contracting States:
	AT BE CH DE DK ES FR GB GR IE IT LI LU NL PT SE

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Priority:

21.05.1993 JP 120160/93
25.05.1993 JP 122619/93
24.08.1993 JP 209415/93
08.09.1993 JP 223685/93
30.09.1993 JP 245513/93
13.05.1994 JP 99927/94

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

(72)	Inventors:
	Shimizu, Eiichiro Ohta-ku, Tokyo (JP) Ikeda, Masami Ohta-ku, Tokyo (JP) Asai, Naohito Ohta-ku, Tokyo (JP) Abe, Tsutomu Ohta-ku, Tokyo (JP) Kashino, Toshio Ohta-ku, Tokyo (JP) Higuma, Masahiko Ohta-ku, Tokyo (JP) Sugimoto, Hitoshi Ohta-ku, Tokyo (JP) Tajima, Hiroki Ohta-ku, Tokyo (JP)

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

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References cited: :

(54)	Ink cartridge, ink eject unit having same and ink jet apparatus having ink jet unit

(57) An ink jet unit (iju) includes an ink jet head for ejecting ink; an ink cartridge (6000) for containing ink (6009) to be supplied to the ink jet head; an ink supply member (2200) for introducing the ink (6009) from the ink cartridge (6000), provided in the ink jet head; a negative pressure generating material (6003) in the ink cartridge (6000); an opening (6002) for permitting contact between the negative pressure generating material (6003) and in the ink supply member (2200); wherein a gap is formed in the opening (6002) when the ink supply member (2200) is in contact with the negative pressure generating material (6003).

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