(19)
(11) EP 0 764 529 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
13.08.1997 Bulletin 1997/33

(43) Date of publication A2:
26.03.1997 Bulletin 1997/13

(21) Application number: 96250175.5

(22) Date of filing: 15.08.1996
(51) International Patent Classification (IPC)6: B41J 2/06
(84) Designated Contracting States:
DE FR GB

(30) Priority: 16.08.1995 JP 208863/95

(71) Applicant: NEC CORPORATION
Tokyo (JP)

(72) Inventors:
  • Uematsu, Ryosuke
    Tokyo (JP)
  • Suetsugu, Junichi
    Tokyo (JP)
  • Shima, Kazuo
    Tokyo (JP)
  • Minemoto, Hitoshi
    Tokyo (JP)
  • Hagiwara, Yoshihiro
    Tokyo (JP)

(74) Representative: Patentanwälte Wenzel & Kalkoff 
Grubesallee 26
22143 Hamburg
22143 Hamburg (DE)

   


(54) Electrostatic ink-jet recording head


(57) A recording electrode 2 is formed on a base plate 1. A cover member 4 having an ink flow path 3 therein is fixed on the base plate. Color particle is used as ink. A convex portion 12 is formed at a tip end portion of a cover member 4 on an ink ejection side. The convex portion 12 is located at a position projecting beyond a tip end portion of the base plate 1 having the recording electrode 12. An ink meniscus 8 is formed along the convex portion 12 on the cover member side. Thus, a component of an electric field tangent direction in the ink meniscus is directed in the tip end direction of the convex portion 12. The convex portion is sawtoothed to increase the electric field component. As a result, it is possible to rapidly supply the charged color particle to the tip end of the meniscus. At the same time, it is possible to carry out the recording at a high speed with high precision.






Search report