(19)
(11) EP 0 945 272 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
26.01.2000 Bulletin 2000/04

(43) Date of publication A2:
29.09.1999 Bulletin 1999/39

(21) Application number: 99106319.9

(22) Date of filing: 26.03.1999
(51) International Patent Classification (IPC)7: B41J 2/175
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 27.03.1998 JP 2824898

(71) Applicant: NEC CORPORATION
Tokyo (JP)

(72) Inventors:
  • Kusumi, Tatsuya
    Kashiwazaki-shi, Niigata (JP)
  • Tanaka, Koichi
    Kashiwazaki-shi, Niigata (JP)

(74) Representative: von Samson-Himmelstjerna, Friedrich R., Dipl.-Phys. et al
SAMSON & PARTNER Widenmayerstrasse 5
80538 München
80538 München (DE)

   


(54) Print head for an ink jet printer


(57) A print head for an ink jet printer of the present invention includes a plurality of nozzles (6) for ejecting ink, an ink passage (3a,3,3b,5) fluidly communicated to the nozzles (6), and a filter (4) disposed in the ink passage (3a,3,3b,5). The ink passage (3a,3,3b,5) has a hydrophobic wall (9) upstream of the filter (4) and a hydrophilic wall (10) downstream of the filter. The print head is capable of reducing the deposition of bubbles on a nozzle portion and thereby insuring desirable printing free from defective ink ejection.






Search report