(19)
(11) EP 0 314 486 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
10.01.1990 Bulletin 1990/02

(43) Date of publication A2:
03.05.1989 Bulletin 1989/18

(21) Application number: 88310139.6

(22) Date of filing: 28.10.1988
(51) International Patent Classification (IPC)4: B41J 3/04, G01D 15/18
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 30.10.1987 US 115498

(71) Applicant: Hewlett-Packard Company
Palo Alto, California 94304 (US)

(72) Inventors:
  • Trueba, Kenneth E.
    Corvallis Oregon 97330 (US)
  • Knight, William R.
    Corvallis Oregon 97330 (US)
  • Nielsen, Niels J.
    Corvallis Oregon 97330 (US)

(74) Representative: Williams, John Francis et al
WILLIAMS, POWELL & ASSOCIATES 34 Tavistock Street
London WC2E 7PB
London WC2E 7PB (GB)


(56) References cited: : 
   
       


    (54) Hydraulically tuned channel architecture


    (57) The use of lumped resistive elements (22, 24, 32) in an ink feed channel (10) between an ink-propelling element, such as a resistor, (12) and an ink supply plenum (16) provide a means of achieving resistive decoupling and meniscus resonance control with a mini­mum of deleterious side effects and design compromises typical of prior art solutions.





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