The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 26, 2010
Filed:
Dec. 13, 2006
Takahiro Yamada, Hitachinaka, JP;
Hitoshi Kida, Hitachinaka, JP;
Satoru Tobita, Hitachinaka, JP;
Kenichi Kugai, Hitachinaka, JP;
Takahiro Yamada, Hitachinaka, JP;
Hitoshi Kida, Hitachinaka, JP;
Satoru Tobita, Hitachinaka, JP;
Kenichi Kugai, Hitachinaka, JP;
Ricoh Printing Systems, Ltd., Tokyo, JP;
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 Veand a first positive voltage Ve, and applies the drive voltage between the common electrode and the discrete electrode. Vbp, Vbn, Ve, and Veare set such that Vbn<Ve<0 and 0<Ve<Vbp.