(19)
(11) EP 0 648 606 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
30.08.1995 Bulletin 1995/35

(43) Date of publication A2:
19.04.1995 Bulletin 1995/16

(21) Application number: 94307663.8

(22) Date of filing: 19.10.1994
(51) International Patent Classification (IPC)6: B41J 2/045
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 19.10.1993 US 139349

(71) Applicant: TEKTRONIX, INC.
Wilsonville, Oregon 97070-1000 (US)

(72) Inventors:
  • Regimbal, Laurent A.
    Boise, Idaho 83704 (US)
  • Burr, Ronald F.
    Wilsonville, Oregon 97070 (US)

(74) Representative: Lawrence, Malcolm Graham et al
Hepworth, Lawrence, Bryer & Bizley Merlin House Falconry Court Bakers Lane
Epping Essex CM16 5DQ
Epping Essex CM16 5DQ (GB)


(56) References cited: : 
   
       


    (54) Drop-on dermand ink-jet head apparatus and method


    (57) An ink-jet apparatus (10) and method provides high-resolution, high-speed printing by providing a transducer drive waveform (160) having a spectral energy distribution (170) that concentrates energy (172) around a frequency associated with a dominant (Helmholtz) ink drop ejection mode and that suppresses energy (174) at resonant frequencies associated with ink inlet (18) and ink outlet structures (24, 26, 28, 14) of the ink-jet head. Spectral energy distribution principles used to shape the transducer drive waveform can be used to enhance the jetting performance of many conventional ink-jet heads.






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