(19)
(11) EP 0 729 834 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.05.1997 Bulletin 1997/21

(43) Date of publication A2:
04.09.1996 Bulletin 1996/36

(21) Application number: 96103179.6

(22) Date of filing: 01.03.1996
(51) International Patent Classification (IPC)6: B41J 2/05, B41J 2/14, B41J 2/16
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 03.03.1995 JP 70866/95
06.03.1995 JP 72391/95

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

(72) Inventor:
  • Suzuki, Takumi
    Tokyo (JP)

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

   


(54) An ink-jet head, a substrate for an ink-jet head, and an ink-jet apparatus


(57) A substrate for an ink-jet head provides a protective layer which can assuredly cover electrothermal transducers even if the thickness of the layer is small. A thin intermediate layer is provided between a heating resistive layer and electrodes. The thin intermediate layer is an insulator on heating portions of the heating resistive layer. According to such a configuration, the life of the heating resistive layer becomes long, and occurrence of burnt deposits is suppressed. Since steps at portions where the thin intermediate layer is provided are small, an excellent film quality can be obtained even if the thickness of the protective layer is relatively small, and an excellent protective property is obtained.






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