EP 0949077 A1 19991013 - Method for ejecting an electrically conductive liquid and continuous ink jet printing device using this method
Title (en)
Method for ejecting an electrically conductive liquid and continuous ink jet printing device using this method
Title (de)
Verfahren zum Ausstossen einer elektrisch leitenden Flüssigkeit und kontinuierliche Tintenstrahldruckvorrichtung für ein solches Verfahren
Title (fr)
Procédé de projection d'un liquide électriquement conducteur et dispositif d'impression par jet d'encre continu utilisant ce procédé
Publication
Application
Priority
FR 9804561 A 19980410
Abstract (en)
The method involves spraying a continuous jet of liquid (14) at a given speed (Yj), cause the jet to split at two distinct predetermined break points (C,L) so as to form drops (22,24) of liquid at a given emission frequency, and apply to these drops quantities of a different electrical charges, according to their break points. The same electrical field is applied onto the drops, so as to deviate only those drops (24) formed at a first (L) of the break points. The jet acted upon so that the two break points are separated by a distance DELTA D strictly less than the wavelength lambda of the jet, defined by the relation lambda = Vj divided by F. The same quantity of charge is applied on all the drops formed in a zone centered on the second break point (C) of length sensibly equal to lambda divided by 4. An Independent claim is also included for an ink jet printer using the method described.
Abstract (fr)
Un ou plusieurs jets (14) d'un liquide électriquement conducteur, tel que de l'encre, sont émis à une vitesse Vj donnés et stimulés de façon à former des gouttes (22,24), à une fréquence F, en deux points de brisure (C,L) séparés par une distance ΔD strictement inférieure à la longueur d'onde λ du jet; définie par la relation λ = Vj/F. Au voisinage respectif de ces points de brisure (C,L), on crée (20) deux zones contiguës que l'on porte à des potentiels électriques constants et de signes opposés (V1,V2). On applique ainsi sur les gouttes (22,24) des quantités de charge électrique différentes et relativement invariables en cas de fluctuation des points de brisure. Un dispositif de déflexion (30) dévie ensuite les gouttes à recycler (24) des gouttes à imprimer (22), selon leur charge, qui découle de leur point de brisure. <IMAGE>
IPC 1-7
IPC 8 full level
B41J 2/105 (2006.01)
CPC (source: EP US)
B41J 2/105 (2013.01 - EP US)
Citation (applicant)
- EP 0512907 A1 19921111 - IMAJE SA [FR]
- US 4638328 A 19870120 - DRAKE DONALD J [US], et al
- US 4220958 A 19800902 - CROWLEY JOSEPH M [US]
Citation (search report)
- [A] US 5523778 A 19960604 - FICKLING ANDREW E [US]
- [A] US 4346387 A 19820824 - HERTZ CARL H
- [DA] DONALD J. DRAKE: "Binary continuous thermal ink jet break off length modulation", XEROX DISCLOSURE JOURNAL., vol. 14, no. 3, June 1989 (1989-06-01), STAMFORD, CONN US, pages 95 - 100, XP000027460
- [A] G. RYDGREN AND C. H. HERTZ: "Ink Jet Marking by Ultrasonic Jet Control", JOURNAL OF IMAGING TECHNOLOGY, vol. 12, no. 2, April 1986 (1986-04-01), Springfield US, pages 88 - 94, XP002088885
- [A] ROBERT A. LONIS: "Breakoff length detection and control", XEROX DISCLOSURE JOURNAL., vol. 12, no. 6, December 1987 (1987-12-01), STAMFORD, CONN US, pages 261 - 263, XP000006578
Designated contracting state (EPC)
DE ES GB IT
DOCDB simple family (publication)
EP 0949077 A1 19991013; EP 0949077 B1 20030917; DE 69911289 D1 20031023; DE 69911289 T2 20040617; ES 2207918 T3 20040601; FR 2777211 A1 19991015; FR 2777211 B1 20000616; US 6273559 B1 20010814
DOCDB simple family (application)
EP 99400831 A 19990406; DE 69911289 T 19990406; ES 99400831 T 19990406; FR 9804561 A 19980410; US 28315399 A 19990401