Recorders – Performance of multiple functions of steam and gas engines – Pressure responsive element
Patent
1986-04-21
1987-09-22
Goldberg, E. A.
Recorders
Performance of multiple functions of steam and gas engines
Pressure responsive element
346 75, G01D 1518
Patent
active
046958487
ABSTRACT:
An inkjet printing system has a drop generator with a nozzle fed by a pressurized ink source to cause a continuous stream of ink to break into synchronized droplets. A pair of electrodes positioned on either side of the path followed by the droplets are controlled in a time multiplex mode to charge the droplets, and then to deflect the charged droplets.
The electronics of this invention provide electronic synchronization and compensation whereby synchronization is achieved between the drop generator stimulation source and the charge/deflect circuit so that during each cycle, a small period of time is allocated for charging and the remaining larger period of time for deflection; and the compensation system provides for the fact that each charged droplet is to be exposed to an equal accumulated deflection energy during its movement between the plates. A gutter collects and recirculate unwanted drops back through the ink system, and provide a drop charge feedback control signal to the synchronization and compensation circuit.
In addition to the charge/deflect assembly electrodes which are used in a time multiplex mode for charging and deflecting the droplets, a pair of electrodes common to all jet streams are provided for generating a constant deflection field perpendicular to the time-multiplexed deflection field and parallel to the direction of motion of the recording medium, so that a complete pixel of the overall field to be printed may be covered by the two-dimensional deflection of the droplets issuing from a single orifice.
REFERENCES:
patent: 4547785 (1985-10-01), Jones
Goldberg E. A.
Preston Gerald E.
Ricoh Co. Ltd.
Ricoh Systems, Inc.
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