High frequency drop-on-demand ink jet system

Details High frequency drop-on-demand ink jet system High frequency drop-on-demand ink jet system

B - Operations, Transporting

41

J

B41J 27/18 (2006.01) B41J 2/04 (2006.01) B41J 2/045 (2006.01) B41J 2/14 (2006.01)

Patent

CA 2152967

In the high-frequency drop-on-demand ink jet system described in the specification, a variable impedance cha- racteristic of an ink jet orifice is utilized to provide maximum drop ejection rates exceeding the maximum rates possible with constant orifice impedance characteristics. In one embodiment, successive negative, positive and neg- ative pulses are applied to eject each drop in order to utilize a-nonlinear orifice impedance characteristic, permitting maximum ink drop ejection rates exceeding 10- 20 kHz and up to 150-200 kHz, and, in another embodiment, the ink jet orifice is designed with a bellmouth shape arranged to enhance the variable imped- ance characteristic.

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