(19)
(11) EP 0 390 548 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.03.1991 Bulletin 1991/13

(43) Date of publication A2:
03.10.1990 Bulletin 1990/40

(21) Application number: 90303345.4

(22) Date of filing: 29.03.1990
(51) International Patent Classification (IPC)5: B41J 2/05
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB GR IT LI LU NL SE

(30) Priority: 31.03.1989 JP 82303/89

(71) Applicant: CANON KABUSHIKI KAISHA
Tokyo (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) Recording head and substrates therefor having pads


    (57) A recording head substrate (1) includes a plurality of electrothermal transducers (4) for generating thermal energy used for the recording; electric lines (40) for electrically connecting the plural electrothermal transducers and a driver circuit (30) for driving the electrothermal transducers; bonding pads (45) connectable with the driving circuit; and additional pads (46) electrically connected to the electric lines, disposed at positions not influential to driving current for the electrothermal transducers.






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