Control system for ink jet printing element

Details Control system for ink jet printing element Control system for ink jet printing element

1983-07-15

1985-02-05

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

310317, 310326, G01D 1516

Patent

active

044980892

ABSTRACT:
The control system is applied to an ink jet head in which the individual drops of ink are expelled from a container by way of a nozzle by the effect of contractions of a piezoelectric transducer applied to the container. The transducer is included in an oscillatory circuit which is normally connected to a dc voltage source. A pulse generator acts on a switch to generate a voltage wave in the oscillatory circuit of the transducer and interrupts the pulse when the current in the oscillatory circuit goes to zero, whereby a single voltage wave with a low harmonics content is generated. The oscillatory circuit is so designed that the frequency spectrum created by the voltage wave drops rapidly with frequencies higher than the resonance frequency of the oscillatory circuit and has at least one node close to the resonance frequency at the lowest nodal diameter mode of vibration of the meniscus.

REFERENCES:
patent: 3029356 (1962-04-01), Renaut
patent: 3532911 (1970-10-01), Roberts
patent: 4369455 (1983-01-01), McConica
patent: 4459599 (1984-07-01), Ort

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