(19)
(11) EP 1 336 490 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
05.11.2003 Bulletin 2003/45

(43) Date of publication A2:
20.08.2003 Bulletin 2003/34

(21) Application number: 03003699.0

(22) Date of filing: 18.02.2003
(51) International Patent Classification (IPC)7: B41J 2/14
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR
Designated Extension States:
AL LT LV MK RO

(30) Priority: 21.02.2002 JP 2002045146
21.02.2002 JP 2002044626
21.02.2002 JP 2002044650
18.02.2002 JP 2002040524

(71) Applicant: BROTHER KOGYO KABUSHIKI KAISHA
Nagoya-shi, Aichi-ken 467 (JP)

(72) Inventors:
  • Sakaida, Atsuo;c/o BROTHER KOGYO KK
    Nagoya-shi, Aichi-ken 467 (JP)
  • Hirota, Atsushi;c/o BROTHER KOGYO KK
    Nagoya-shi, Aichi-ken 467 (DE)

(74) Representative: Hofer, Dorothea, Dipl.-Phys. et al
Prüfer & Partner GbR Patentanwälte Harthauser Strasse 25 d
81545 München
81545 München (DE)

   


(54) Ink-jet head and ink-jet printer having ink-jet head


(57) An ink-jet head (1) has a passage unit (4) including a plurality of pressure chambers (10) each having one end connected with a nozzle (8) and the other end to be connected with an ink supply source. Each of the pressure chambers (10) is confined in each of a plurality of parallelogram regions (10x) and has an elliptical planar shape with no corner bulging in a direction to leave a line joining the one end and the other end in each of the pressure chambers (10), in a plane of the passage unit (4) where the pressure chambers (10) are arranged. The planar shape of the pressure chamber is slender along a longer diagonal line of a rhombic region, and a direction of the longer diagonal line of a rhombic region and a direction of a direction joining the one end and the other end in each of the pressure chambers (10) are substantially coincident with each other






Search report