(19)
(11) EP 0 389 296 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
03.04.1991 Bulletin 1991/14

(43) Date of publication A2:
26.09.1990 Bulletin 1990/39

(21) Application number: 90303137.5

(22) Date of filing: 23.03.1990
(51) International Patent Classification (IPC)5: B41J 2/16, B41J 2/155
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB GR IT LI LU NL SE

(30) Priority: 24.03.1989 JP 72183/89
12.01.1990 JP 3479/89

(71) Applicant: CANON KABUSHIKI KAISHA
Tokyo 146 (JP)

(72) Inventor:
  • Osada, Torachika
    Ohta-ku, Tokyo (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) Ink jet head substrate and ink jet head having the same


    (57) An ink jet recording head substrate includes a supporting member (1), a plurality of electrothermal transducers having heat generating resistors (2a) and electrodes (3a, b) electrically connected to the heat generating resistors; and identification marks (4) for easy identification of each of the electrothermal transducers.






    Search report