(19)
(11) EP 0 505 154 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
24.03.1993 Bulletin 1993/12

(43) Date of publication A2:
23.09.1992 Bulletin 1992/39

(21) Application number: 92302313.9

(22) Date of filing: 18.03.1992
(51) International Patent Classification (IPC)5: B41J 2/07
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 20.03.1991 JP 57457/91
20.03.1991 JP 57460/91
02.03.1992 JP 44773/92

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

(72) Inventors:
  • Otsuka, Naoji, c/o Canon Kabushiki Kaisha
    Ohta-ku, Tokyo (JP)
  • Hirabayashi, Hiromitsu, c/o Canon Kabushiki Kaisha
    Ohta-ku, Tokyo (JP)
  • Yano, Kentaro, c/o Canon Kabushiki Kaisha
    Ohta-ku, Tokyo (JP)
  • Takahashi, Kiichiro, c/o Canon Kabushiki Kaisha
    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) Thermal ink jet recording head temperature control


    (57) According to this invention, upon execution of recording by ejecting an ink droplet from a recording head, a surrounding temperature sensor for measuring the surrounding temperature is provided to a main body side, and a change in temperature of the head is presumed from the past to the present time by calculation processing, so that optimal temperature control can be performed without arranging a head temperature sensor having a correlation with the head temperature.
    At this time, the ejection quantity can be stabilized by changing the pulse width of a driving signal on the basis of the presumed head temperature, and ejection can be stabilized by performing restoration processing.






    Search report