Ink jet printer with satellite droplet control

Details Ink jet printer with satellite droplet control Ink jet printer with satellite droplet control

1986-08-11

1988-03-29

Goldberg, E. A.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346 75, G01D 1518

Patent

active

047347058

ABSTRACT:
An externally stimulated continuous stream ink jet printer which suppresses or controls the formation of satellite droplets so that they are not charged differently from the main droplets. Thus, when the two are merged, indeterminate charges are not produced which would impact the print quality of the printer. The satellites are suppressed by impressing on the printer ink streams a combination of time-varying pressures. In one embodiment, the time-varying pressures are generated by two time-varying voltages applied to the EHD electrodes. One pressure has a fundamental frequency with the second pressure having a second harmonic frequency, these two pressures having a predetermined phase and amplitudes with respect to each other. The fundamental frequency is selected for a required drop spacing to stream diameter ratio.

REFERENCES:
patent: 3596275 (1971-07-01), Sweet
patent: 3928855 (1975-12-01), Helinski et al.
patent: 3949410 (1976-04-01), Bassous et al.
patent: 4018383 (1977-04-01), Paton et al.
patent: 4220958 (1980-09-01), Crowley
patent: 4314263 (1982-02-01), Carley
patent: 4568946 (1986-02-01), Weinberg
IBM Journal of Research and Development, vol. 21, No. 1, 1977, by W. Pimbley & H. Lee, pp. 21-30, "Satellite Droplet Formation in a Liquid Jet".

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