Ink jet air bubble detection

Details Ink jet air bubble detection Ink jet air bubble detection

1982-07-22

1985-02-05

Goldberg, E. A.

Recorders

Markers and/or driving means therefor

With ink supply to marker

364518, G01D 1518

Patent

active

044980884

ABSTRACT:
An air bubble detection system is provided for detecting air bubbles contained in an ink liquid disposed in a printer head of an ink jet system printer of the ink on demand type. The air bubble detection system includes a driver circuit for activating a piezoelectric transducer attached to a pressure chamber, thereby creating an initial oscillation in the ink liquid. The air bubble detection system further includes a sensing circuit for sensing a residual oscillation of the ink liquid after termination of the initial oscillation. When air bubbles are contained in the ink liquid, a high frequency component is included in an output signal obtained by the sensing circuit.

REFERENCES:
patent: 4241406 (1980-12-01), Kennedy et al.
patent: 4296417 (1981-10-01), Markham et al.

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