Incremental printing of symbolic information – Ink jet – Ejector mechanism
Patent
1996-06-12
1999-03-02
Le, N.
Incremental printing of symbolic information
Ink jet
Ejector mechanism
347 10, 347 70, B41J 214, B41J 216
Patent
active
058777890
ABSTRACT:
Ink-jet system includes an ink channel between an ink reservoir and a nozzle. A pressurizing device is arranged adjacent to the ink channel for generating in the ink liquid an acoustic pressure wave propagating in the ink channel, so that an ink droplet is expelled from the nozzle. The ink channel has a substantially rectangular cross section and a depth d which is larger than the height of the nozzle, such that energy losses due to reflection of the acoustic wave at the transition from the ink channel to the nozzle are minimized. The pressurizing device includes a first electromechanical transducer with a plate-like expansible member having a height H in the direction of the depth of the ink channel such that the ratio H/d is smaller than the ratio between the respective elastic modules of the expansible member and the ink liquid. At least one second electromechanical transducer is arranged at said ink channel and is energized to create a pressure bias in the ink volume before the same is pressurized by the first transducer.
REFERENCES:
patent: 4190783 (1980-02-01), Massa
patent: 4364069 (1982-12-01), Kobayashi
patent: 4523199 (1985-06-01), Ott
patent: 4525728 (1985-06-01), Koto
patent: 4672398 (1987-06-01), Kuwabara et al.
patent: 5657063 (1997-08-01), Takahashi
'1985 Sid International Symposium, Digest 1-8 of Technical Papers, May 1985, pp. 317-320.
IBM Technical Disclosure Bulletin, vol. 26, No. 10B, Mar. 1984, pp. 5646-5647.
Dickens C.
Le N.
Oce'-Nederland, B.V.
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