(11) EP 0 890 437 A3


(88) Date of publication A3:
28.07.1999 Bulletin 1999/30

(43) Date of publication A2:
13.01.1999 Bulletin 1999/02

(21) Application number: 98119751.0

(22) Date of filing: 09.04.1996
(51) International Patent Classification (IPC)6B41J 2/04, B41J 2/06
(84) Designated Contracting States:

(30) Priority: 12.04.1995 AU PN2308/95
12.04.1995 AU PN2310/95
12.04.1995 AU PN2311/95
12.04.1995 AU PN2312/95

(62) Application number of the earlier application in accordance with Art. 76 EPC:
96911663.1 / 0765235

Rochester, New York 14650-2201 (US)

(72) Inventor:
  • Silverbrook, Kia
    Rochester, New York 14650-2201 (US)

(74) Representative: Reichert, Werner F., Dr. rer.nat., Dipl.-Phys. et al
Kodak Aktiengesellschaft, Patent Department
70323 Stuttgart
70323 Stuttgart (DE)


(54) A liquid ink printing apparatus and system

(57) A new printing system is disclosed for drop on demand printing. This printing mechanism divides the printing process into two stages; a drop selection means to select drops to be printed which generates a difference in meniscus position between selected drops and unselected drops of fluidized ink; and a drop separation means, attracting the ink of said drops to a substrate, the attraction being insufficient to overcome the surface tension of drops in an unselected meniscus position but being sufficient to overcome the surface tension of drops in a selected meniscus position so as to cause movement of the drops to the substrate. The drop selection means can produce a difference in meniscus position in the absence of the drop separation means.
The separation of drop selection means from drop separation means significantly reduces the energy required to select which ink drops are to be printed. Only the drop selection means must be driven by individual signals to each nozzle. The drop separation means can be a field or condition applied simultaneously to all nozzles.

Search report