Image forming apparatus and manufacturing system for production of ejection head
AssigneeRicoh Printing Systems, Ltd.
InventorsTakahiro YAMADA, Hitoshi Kida, Tomohiko Koda
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Abstract
An image forming apparatus having a liquid ejection head including a plurality of nozzles for ejecting droplets and a plurality of piezoelectric elements for generating a pressure for discharging droplets in respective nozzles. The image forming apparatus includes a polarization adjustment unit that performs a polarization adjustment in parallel for adjustment of target nozzles.
Claims21
An image forming apparatus comprising:
- a liquid ejection head comprising a plurality of nozzles configured to eject droplets and comprising a plurality of piezoelectric elements configured to generate in respective nozzles a pressure for discharging droplets from selected ones of the nozzles;
- and
- a polarization adjustment unit configured to adjust polarization degrees of a set of the piezoelectric elements in parallel based on a prior evaluation of the polarization degrees of said set of the piezoelectric elements.
A head manufacturing system for manufacturing a liquid ejection head including a plurality of nozzles configured to eject droplets and including a plurality of piezoelectric elements configured to generate in respective nozzles a pressure for discharging droplets from selected ones of the nozzles, the head manufacturing system comprising:
- a polarization degree evaluating unit configured to evaluate polarization degrees of a set of the piezoelectric elements;
- and
- a polarization adjustment unit configured to adjust polarization degrees of the set of the piezoelectric elements in parallel based on a prior evaluation of the polarization degrees of said set of the piezoelectric elements.
A method for adjusting uniformity of liquid ejection from a liquid ejection head, comprising:
- determining polarization degrees for a set of piezoelectric elements corresponding to nozzles of the liquid ejection head;
- and
- adjusting polarization degrees of the set of the piezoelectric elements in parallel based on the determined polarization degrees of said set of the piezoelectric elements.
A system for adjusting uniformity of liquid ejection from a liquid ejection head, comprising:
- means for determining polarization degrees for a set of piezoelectric elements corresponding to nozzles of the liquid ejection head;
- and
- means for adjusting polarization degrees of the set of the piezoelectric elements in parallel based on the determined polarization degrees of said set of the piezoelectric elements.
Dependencies are inferred from the claim text.