Liquid discharging head, method of manufacturing liquid discharging head, and image forming apparatus
View Patent ↗A liquid discharging head includes: a plurality of nozzles that discharge liquid droplets; and a plurality of piezoelectric elements that generate pressure for discharging liquid droplets from the respective nozzles, wherein the piezoelectric elements are performed with repolarization process to set non-uniformity of the droplet discharging characteristics of the nozzles to be in a predetermined range by combining adjustment of a polarization sensitivity and adjustment of a polarization voltage for each of the piezoelectric elements.
1. A liquid discharging head comprising:
a plurality of nozzles that discharge liquid droplets; and
a plurality of piezoelectric elements that generate pressure for discharging liquid droplets from the respective nozzles,
wherein the piezoelectric elements are repolarized so as to set non-uniformity of droplet discharging characteristics of the nozzles to be in a predetermined range, and
wherein a piezoelectric element of the piezoelectric elements includes a polarization sensitivity and a polarization voltage different from a polarization sensitivity and a polarization voltage of another piezoelectric element of the piezoelectric elements.
2. The liquid discharging head according to claim 1 , wherein the amounts of the polarization sensitivity for the piezoelectric elements corresponding to two or more of the nozzles that have similar droplet discharging characteristics are set to a same amount.
3. The liquid discharging head according to claim 1 , wherein a piezoelectric element with a polarization sensitivity and a set polarization voltage comprises a droplet discharging characteristic different from another piezoelectric element with another polarization sensitivity and the set polarization voltage.
4. The liquid discharging head according to claim 1 , wherein the droplet discharging characteristics include a discharge speed of an ink droplet.
5. The liquid discharging head according to claim 1 , wherein the droplet discharging characteristics include a mass of an ink droplet.
6. The liquid discharging head according to claim 1 , wherein the piezoelectric element comprises a polarization sensitivity adjusted by an AC waveform pulse.
7. The liquid discharging head according to claim 1 , further comprising a diaphragm,
wherein the piezoelectric elements comprise a rod-shape such that a front end portion of the piezoelectric elements contacts the diaphragm.
8. The liquid discharging head according to claim 1 , wherein the piezoelectric elements comprise lamination-type piezoelectric elements.
9. An image forming apparatus comprising:
a recording medium conveyance mechanism that conveys a recording medium; and
a liquid discharging head that includes:
a plurality of nozzles that discharge liquid droplets onto the recording medium; and
a plurality of piezoelectric elements that generate pressure for discharging liquid droplets from the respective nozzles,
wherein the piezoelectric elements are repolarized so as to set non-uniformity of the droplet discharging characteristics of the nozzles to be in a predetermined range, and
wherein a piezoelectric element of the piezoelectric elements includes a polarization sensitivity and a polarization voltage different from a polarization sensitivity and a polarization voltage of another piezoelectric element of the piezoelectric elements.