(19)
(11) EP 0 294 288 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
13.06.1990 Bulletin 1990/24

(43) Date of publication A2:
07.12.1988 Bulletin 1988/49

(21) Application number: 88401330.1

(22) Date of filing: 01.06.1988
(51) International Patent Classification (IPC)4: B41J 2/30, B41J 7/92, B41J 2/23
(84) Designated Contracting States:
DE FR GB

(30) Priority: 02.06.1987 JP 137733/87

(71) Applicant: Oki Electric Industry Company, Limited
Tokyo 105 (JP)

(72) Inventors:
  • Tanuma, Jiro c/o OKI El. IND. Co., Ltd.
    Minatoku§Tokyo (JP)
  • Ishimizu, Hideaki c/o OKI El. IND. Co., Ltd.
    Minatoku§Tokyo (JP)
  • Kasai, Tadashi c/o OKI El. IND. Co., Ltd.
    Minatoku§Tokyo (JP)
  • Sakaino, Hiroshi c/o OKI El. IND. Co., Ltd.
    Minatoku§Tokyo (JP)

(74) Representative: Rodhain, Claude (FR) et al
Brevets Rodhain & Porte 3, rue Moncey
F-75009 Paris
F-75009 Paris (FR)


(56) References cited: : 
   
       


    (54) Dot matrix print head drive method


    (57) In a dot matrix print head drive method for controlling head drive signals for driving dot pins in accordance with print pattern signals, a correction factor is set specifically to each dot pin; and the length of time for which the print pattern signals are to remain in effects is varied according to the correction factor, to correct the drive time for each dot pin.







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