System for driving ink drop generator of ink-jet printer

Details System for driving ink drop generator of ink-jet printer System for driving ink drop generator of ink-jet printer

1979-06-20

1981-09-22

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

G01D 1518

Patent

active

042913160

ABSTRACT:
In one embodiment of the present invention an ink manifold is divided into a first ink chamber communicated with an ink drop issuing nozzle and a second ink chamber communicated with an ink source and the first ink chamber through a narrow passage. First and second piezoelectric elements are mounted in opposed relationship with the first and second ink chambers, respectively. The second piezoelectric element is normally applied with such a second driving voltage that the ink will not issue through the nozzle. The frequency of a first driving voltage applied to the first piezoelectric element is twice as high as that of the second driving voltage, and the first driving voltage is selectively applied in synchronism with the second driving voltage only during the positive going half cycle thereof so that an ink drop may be issued through the nozzle during the positive going half cycle of the first driving voltage. In another embodiment of the present invention a plurality of ink drop generating cells substantially similar in construction to the ink drop generator described above are assembled to provide an ink drop generator having an array of nozzle matrix.

REFERENCES:
patent: 3848118 (1974-11-01), Rittberg
patent: 3988745 (1976-10-01), Sultan
patent: 4045801 (1977-08-01), Iwasaki
patent: 4068144 (1978-01-01), Toye
patent: 4104645 (1978-08-01), Fischbeck

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