Patents by Inventor Takashi Tokukura

Takashi Tokukura has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for production of liquid ejecting head unit
    Patent number: 7926153
    Abstract: The invention provides a method of producing a liquid ejecting head unit that has a plurality of liquid ejecting heads combined with one another. Each of the plurality of liquid ejecting heads has a fluid channel formation substrate, which has pressure generation chambers that are in communication with nozzle orifices through which liquid is ejected, and piezoelectric elements, each of which is made up of a lower electrode, a piezoelectric layer that has hysteresis characteristic in a polarization electric field, and an upper electrode, formed on the fluid channel formation substrate with a vibrating plate being interposed therebetween. The liquid ejecting head unit production method according to an aspect of the invention includes: acquiring coercive electric fields of the piezoelectric layers of the liquid ejecting heads; classifying the liquid ejecting heads into ranks on the basis of the acquired coercive electric fields; and combining the liquid ejecting heads that belong to the same rank together.
    Type: Grant
    Filed: November 6, 2007
    Date of Patent: April 19, 2011
    Assignee: Seiko Epson Corporation
    Inventor: Takashi Tokukura
  • METHOD FOR PRODUCTION OF LIQUID EJECTING HEAD UNIT
    Publication number: 20080178443
    Abstract: The invention provides a method of producing a liquid ejecting head unit that has a plurality of liquid ejecting heads combined with one another. Each of the plurality of liquid ejecting heads has a fluid channel formation substrate, which has pressure generation chambers that are in communication with nozzle orifices through which liquid is ejected, and piezoelectric elements, each of which is made up of a lower electrode, a piezoelectric layer that has hysteresis characteristic in a polarization electric field, and an upper electrode, formed on the fluid channel formation substrate with a vibrating plate being interposed therebetween. The liquid ejecting head unit production method according to an aspect of the invention includes: acquiring coercive electric fields of the piezoelectric layers of the liquid ejecting heads; classifying the liquid ejecting heads into ranks on the basis of the acquired coercive electric fields; and combining the liquid ejecting heads that belong to the same rank together.
    Type: Application
    Filed: November 6, 2007
    Publication date: July 31, 2008
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Takashi TOKUKURA