| 摘要 |
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.
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