| 摘要 |
An ink jet print head includes a manifold defining a fluid receiving reservoir, and an orifice plate mounted on the manifold and defining a plurality of orifices which communicate with the reservoir. Fluid flows through the orifices and emerges as fluid filaments which break up into jet drop streams. A stimulator transducer contacts the orifice plate and, upon receipt of a drive signal, vibrates the orifice plate so as to cause bending waves to travel along the plate. The bending waves stimulate the breakup of the jet drop streams. A sensor transducer is mounted on the orifice plate at the opposite end thereof from the stimulator transducer. The sensor transducer produces an electrical feedback signal which is proportional in amplitude to the amplitude of the bending waves. This feedback signal is used by a drive circuit to control the amplitude of the drive signal applied to the stimulator transducer. The sensor transducer is calibrated by observing the breakup of jet drop streams as the drive signal is varied, and when an optimum breakup is observed, the output of the sensor transducer is adjusted to a predetermined amplitude level. This adjustment is made by applying D.C. pulses of proper polarity to the sensor transducer, poling the piezoelectric transducer.
|
