Invention Grant
- Patent Title: Inkjet recording device, ejecting device provided therein, and method of calibrating ejection characteristic for droplet
- Patent Title (中): 喷墨记录装置,其中提供的喷射装置和校准液滴的喷射特性的方法
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Application No.: US11610152Application Date: 2006-12-13
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Publication No.: US07651203B2Publication Date: 2010-01-26
- Inventor: Takahiro Yamada , Hitoshi Kida , Satoru Tobita , Kenichi Kugai
- Applicant: Takahiro Yamada , Hitoshi Kida , Satoru Tobita , Kenichi Kugai
- Applicant Address: JP Tokyo
- Assignee: Ricoh Printing Systems, Ltd.
- Current Assignee: Ricoh Printing Systems, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Whitham Curtis Christofferson & Cook, PC
- Priority: JPP2005-359767 20051214
- Main IPC: B41J2/045
- IPC: B41J2/045

Abstract:
A droplet ejecting device includes a nozzle unit, a piezoelectric member and a drive voltage generating unit. The piezoelectric member has a common electrode and a discrete electrode. A first differentiation by polarization voltage of a characteristic curve indicating change in a polarization of the piezoelectric member with respect to change in the polarization voltage has a plurality of extremal values including a first extremal value at a prescribed positive voltage Vbp that is the smallest polarization voltage among plus polarization voltages corresponding to the plurality of extremal values, and a second extremal value at a prescribed negative voltage Vbn that is the largest polarization voltage among minus polarization voltages corresponding to the plurality of extremal values. The drive voltage generating unit generates a drive voltage having a range between a first negative voltage Ve1 and a first positive voltage Ve2, and applies the drive voltage between the common electrode and the discrete electrode. Vbp, Vbn, Ve1, and Ve2 are set such that Vbn
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