Patents by Inventor Yoshihiro Tajitsu

Yoshihiro Tajitsu 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).

  • Piezoelectric sheet, method for manufacturing piezoelectric sheet, and manufacturing apparatus
    Patent number: 9537084
    Abstract: A specific region of a polylactic acid sheet is heated by a microwave. To allow the polylactic acid sheet to exhibit piezoelectricity in the thickness direction of the polylactic acid sheet, a high voltage is applied to the heated polylactic acid sheet in the thickness direction of the polylactic acid sheet, and thereby the screw axes of at least a part of the polylactic acid molecules are relatively aligned with the thickness direction. Then the polylactic acid sheet is rapidly cooled, and thereby the polylactic acid molecules are immobilized. The same step is executed for other regions of the polylactic acid sheet, and thereby piezoelectricity is imparted to a wide area of the polylactic acid sheet in the thickness direction. The resultant piezoelectric sheet is capable of exhibiting a high piezoelectricity in the thickness direction.
    Type: Grant
    Filed: April 29, 2015
    Date of Patent: January 3, 2017
    Assignees: MURATA MANUFACTURING CO., LTD., A SCHOOL CORPORATION KANSAI UNIVERSITY
    Inventors: Masamichi Ando, Yoshihiro Tajitsu
  • Piezoelectric Sheet, Method for Manufacturing Piezoelectric Sheet, And Manufacturing Apparatus
    Publication number: 20150280106
    Abstract: A specific region of a polylactic acid sheet is heated by a microwave. To allow the polylactic acid sheet to exhibit piezoelectricity in the thickness direction of the polylactic acid sheet, a high voltage is applied to the heated polylactic acid sheet in the thickness direction of the polylactic acid sheet, and thereby the screw axes of at least a part of the polylactic acid molecules are relatively aligned with the thickness direction. Then the polylactic acid sheet is rapidly cooled, and thereby the polylactic acid molecules are immobilized. The same step is executed for other regions of the polylactic acid sheet, and thereby piezoelectricity is imparted to a wide area of the polylactic acid sheet in the thickness direction. The resultant piezoelectric sheet is capable of exhibiting a high piezoelectricity in the thickness direction.
    Type: Application
    Filed: April 29, 2015
    Publication date: October 1, 2015
    Inventors: Masamichi Ando, Yoshihiro Tajitsu