Patents by Inventor Tokahiro Yamada

Tokahiro Yamada 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).

  • Liquid discharging head, method of manufacturing liquid discharging head, and image forming apparatus
    Publication number: 20080316280
    Abstract: 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.
    Type: Application
    Filed: June 19, 2008
    Publication date: December 25, 2008
    Applicant: RICOH PRINTING SYSTEMS, LTD.
    Inventors: Tokahiro Yamada, Tomohiko Koda, Hitoshi Kida