Patents by Inventor Yasuaki Hamada

Yasuaki Hamada 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).

  • Publication number: 20150002586
    Abstract: A piezoelectric material contains a first component that is a rhombohedral crystal and that is configured to have a complex oxide with a perovskite structure and Curie temperature Tc1, a second component that is a crystal other than a rhombohedral crystal and that is configured to have a complex oxide with a perovskite structure and Curie temperature e Tc2, and a third component that is a rhombohedral crystal and that is configured to have a complex oxide with a perovskite structure and Curie temperature Tc3 different from the first component, and in which Tc2 is higher than Tc1, Tc3 is equal to or higher than Tc2, and a value of (0.1×Tc1+0.9×Tc2) is equal to or lower than 280° C.
    Type: Application
    Filed: March 26, 2014
    Publication date: January 1, 2015
    Applicant: Seiko Epson Corporation
    Inventors: Koji SUMI, Kazuya KITADA, Tomohiro SAKAI, Yasuaki HAMADA, Tetsuya ISSHIKI, Satoshi KIMURA, Akio ITO, Tsuneo HANDA
  • Publication number: 20150002584
    Abstract: A piezoelectric material contains a first component that is a rhombohedral crystal that is configured to have a complex oxide with a perovskite structure and Curie temperature Tc1 and a second component that is a crystal other than a rhombohedral crystal that is configured to have a complex oxide with the perovskite structure and Curie temperature Tc2, in which |Tc1?Tc2| is equal to or less than 50° C.
    Type: Application
    Filed: March 26, 2014
    Publication date: January 1, 2015
    Applicant: Seiko Epson Corporation
    Inventors: Koji SUMI, Kazuya KITADA, Tomohiro SAKAI, Yasuaki HAMADA, Tetsuya ISSHIKI, Satoshi KIMURA, Akio ITO, Tsuneo HANDA
  • Publication number: 20150002585
    Abstract: A piezoelectric material contains a first component that is a rhombohedral crystal that is configured to have a complex oxide with a perovskite structure and Curie temperature Tc1, a second component that is a crystal other than a rhombohedral crystal that is configured to have a complex oxide with the perovskite structure and Curie temperature Tc2, and a third component that is configured to have a complex oxide with the perovskite structure in which the component is formed as the same crystal system as the second component and Curie temperature Tc3, in which Tc1 is higher than Tc2, and Tc3 is equal to or higher than Tc1.
    Type: Application
    Filed: March 26, 2014
    Publication date: January 1, 2015
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Koji SUMI, Kazuya KITADA, Tomohiro SAKAI, Yasuaki HAMADA, Tetsuya ISSHIKI, Satoshi KIMURA, Akio ITO, Tsuneo HANDA
  • Patent number: 8884227
    Abstract: A sensor includes a first electrode, a second electrode, a ferroelectric element that is disposed between the first electrode and the second electrode and that has a ferroelectric film formed of a ferroelectric substance, and a detector configured to read an electric charge generated in the ferroelectric element. The detector performs reading by applying a first voltage for aligning polarization directions of the ferroelectric film and a second voltage for reversing polarization of at least part of the ferroelectric film whose polarization directions have been aligned.
    Type: Grant
    Filed: February 5, 2014
    Date of Patent: November 11, 2014
    Assignee: Seiko Epson Corporation
    Inventor: Yasuaki Hamada
  • Patent number: 8851635
    Abstract: There are provided a piezoelectric element comprising a first electrode, a piezoelectric layer and a second electrode, the piezoelectric layer is made of a piezoelectric material that contains a bismuth ferrite and silicon dioxide.
    Type: Grant
    Filed: March 1, 2011
    Date of Patent: October 7, 2014
    Assignee: Seiko Epson Corporation
    Inventor: Yasuaki Hamada
  • Publication number: 20140290734
    Abstract: A photoelectric conversion element includes a ferroelectric layer; a first electrode and a second electrode provided on a surface or a surface layer portion of the ferroelectric layer; a common electrode provided on a surface or a surface layer portion of an opposite side to a side of the ferroelectric layer on which the first electrode and the second electrode are provided; and a pair of lead-out electrodes extracting electric power from the ferroelectric layer, in which the first electrode and the second electrode are arranged alternately in a predetermined direction.
    Type: Application
    Filed: March 24, 2014
    Publication date: October 2, 2014
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Satoru HOSONO, Satoshi KIMURA, Setsuya IWASHITA, Yasuaki HAMADA
  • Publication number: 20140290733
    Abstract: A photoelectric conversion element includes a ferroelectric layer as a photoelectric conversion layer. The ferroelectric layer is formed from a polycrystalline ferroelectric material and includes a plurality of domains. Adjacent two of the plurality of domains have different polarized states.
    Type: Application
    Filed: March 21, 2014
    Publication date: October 2, 2014
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Yasuaki HAMADA, Satoshi KIMURA, Setsuya IWASHITA, Satoru HOSONO
  • Publication number: 20140290725
    Abstract: A photoelectric conversion element includes a ferroelectric layer; a first electrode provided on a surface or a surface layer portion of the ferroelectric layer; a second electrode provided on a surface or a surface layer portion of the ferroelectric layer, and allowing a voltage to be applied between the first electrode and the second electrode, and a pair of lead-out electrodes that extract electric power from the ferroelectric layer, in which the first electrode and the second electrode are arranged alternately in a predetermined direction.
    Type: Application
    Filed: March 21, 2014
    Publication date: October 2, 2014
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Satoru HOSONO, Satoshi KIMURA, Setsuya IWASHITA, Yasuaki HAMADA
  • Publication number: 20140284480
    Abstract: An infrared sensor includes a heat sensing element, the heat sensing element includes a first electrode, a second electrode and a dielectric film formed between the first electrode and the second electrode. The heat sensing element senses heat based on a change of a resistance value. The dielectric film includes at least Bi and Fe.
    Type: Application
    Filed: March 24, 2014
    Publication date: September 25, 2014
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Takayuki YONEMURA, Takafumi NODA, Yasushi TSUCHIYA, Yasuaki HAMADA
  • Publication number: 20140264028
    Abstract: A sensor includes a first electrode, a second electrode, a ferroelectric element that is disposed between the first electrode and the second electrode and that has a ferroelectric film formed of a ferroelectric substance, and a detector configured to read an electric charge generated in the ferroelectric element. The detector performs reading by applying a first voltage for aligning polarization directions of the ferroelectric film and a second voltage for reversing polarization of at least part of the ferroelectric film whose polarization directions have been aligned.
    Type: Application
    Filed: February 5, 2014
    Publication date: September 18, 2014
    Applicant: Seiko Epson Corporation
    Inventor: Yasuaki Hamada
  • Publication number: 20140251436
    Abstract: A photoelectric conversion element includes a PN junction formed from an N-type oxide layer and a P-type oxide layer. The P-type oxide layer is formed from an oxide having a perovskite structure.
    Type: Application
    Filed: February 19, 2014
    Publication date: September 11, 2014
    Applicant: Seiko Epson Corporation
    Inventors: Yasuaki Hamada, Satoshi Kimura, Setsuya Iwashita, Akio Konishi
  • Patent number: 8721054
    Abstract: A liquid ejecting head which discharges a liquid from nozzle openings includes: a piezoelectric element which is provided with a piezoelectric layer and an electrode provided on the piezoelectric layer, and the piezoelectric layer is formed of a complex oxide having a perovskite structure which contains bismuth, iron, barium, titanium, and at least one selected from the group consisting of copper, nickel, and zinc.
    Type: Grant
    Filed: November 30, 2012
    Date of Patent: May 13, 2014
    Assignee: Seiko Epson Corporation
    Inventor: Yasuaki Hamada
  • Patent number: 8714712
    Abstract: A piezoelectric element having a piezoelectric layer and electrodes. The piezoelectric layer is 3 ?m or less in thickness. The piezoelectric layer is made of a piezoelectric material containing a perovskite compound including bismuth manganate ferrate and barium titanate. The piezoelectric layer is preferentially oriented with the (110) plane. The position (2?) of the X-ray diffraction peak attributed to the (110) plane is 31.80° or more and 32.00° or less.
    Type: Grant
    Filed: March 1, 2011
    Date of Patent: May 6, 2014
    Assignee: Seiko Epson Corporation
    Inventor: Yasuaki Hamada
  • Publication number: 20140092176
    Abstract: A liquid ejection head including a piezoelectric element having a piezoelectric layer and electrodes The piezoelectric layer is 3 ?m or less in thickness. The piezoelectric layer is made of a piezoelectric material including bismuth manganate ferrate and barium titanate. The piezoelectric layer is preferentially oriented with the (110) plane.
    Type: Application
    Filed: December 9, 2013
    Publication date: April 3, 2014
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Yasuaki HAMADA
  • Patent number: 8641174
    Abstract: A liquid ejection head including a piezoelectric element having a piezoelectric layer and electrodes The piezoelectric layer is 3 ?m or less in thickness. The piezoelectric layer is made of a piezoelectric material including bismuth manganate ferrate and barium titanate. The piezoelectric layer is preferentially oriented with the (110) plane.
    Type: Grant
    Filed: March 1, 2011
    Date of Patent: February 4, 2014
    Assignee: Seiko Epson Corporation
    Inventor: Yasuaki Hamada
  • Patent number: 8395302
    Abstract: A piezoelectric element includes a first electrode, a piezoelectric film disposed on the first electrode, and a second electrode disposed on the piezoelectric film. The piezoelectric film is composed of piezoelectric material that is lead free and formed by mixing 100(1?x) % of material A having a spontaneous polarization of 0.5 C/m2 or greater at 25° C. and 100 x % of material B having piezoelectric characteristics and a dielectric constant of 1000 or greater at 25° C., wherein (1?x)Tc(A)+x Tc(B)?300° C., where Tc(A) is the Curie temperature of the material A and Tc(B) is the Curie temperature of the material B.
    Type: Grant
    Filed: December 16, 2011
    Date of Patent: March 12, 2013
    Assignee: Seiko Epson Corporation
    Inventors: Yasuaki Hamada, Takeshi Kijima
  • Publication number: 20120086758
    Abstract: A piezoelectric element includes a first electrode, a piezoelectric film disposed on the first electrode, and a second electrode disposed on the piezoelectric film. The piezoelectric film is composed of piezoelectric material that is lead free and formed by mixing 100(1?x) % of material A having a spontaneous polarization of 0.5 C/m2 or greater at 25° C. and 100 x % of material B having piezoelectric characteristics and a dielectric constant of 1000 or greater at 25° C., wherein (1?x)Tc(A)+x Tc(B)?300° C., where Tc(A) is the Curie temperature of the material A and Tc(B) is the Curie temperature of the material B.
    Type: Application
    Filed: December 16, 2011
    Publication date: April 12, 2012
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Yasuaki HAMADA, Takeshi KIJIMA
  • Patent number: 8102100
    Abstract: A piezoelectric element includes a first electrode, a piezoelectric film disposed on the first electrode, and a second electrode disposed on the piezoelectric film. The piezoelectric film is composed of piezoelectric material that is lead free and formed by mixing 100(1?x)% of material A having a spontaneous polarization of 0.5 C/m2 or greater at 25° C. and 100 x % of material B having piezoelectric characteristics and a dielectric constant of 1000 or greater at 25° C., wherein (1?x)Tc(A)+xTc(B)?300° C., where Tc(A) is the Curie temperature of the material A and Tc(B) is the Curie temperature of the material B.
    Type: Grant
    Filed: March 30, 2009
    Date of Patent: January 24, 2012
    Assignee: Seiko Epson Corporation
    Inventors: Yasuaki Hamada, Takeshi Kijima
  • Patent number: 8075795
    Abstract: A piezoelectric body includes a perovskite type compound that is expressed by a compositional formula being Pb (Zrx Ti1-x)1-y My O3, where M is at least one of Ta and Nb, x is in a range of 0.51?x?0.57, and y is in a range of 0.05?y<0.2, wherein the perovskite type compound contains at least one of SiO2 and GeO2 as an additive, and the additive is added in an amount of 0.5 mol % or higher but 5 mol % or lower with respect to the amount of perovskite type compound.
    Type: Grant
    Filed: March 12, 2009
    Date of Patent: December 13, 2011
    Assignee: Seiko Epson Corporation
    Inventors: Yasuaki Hamada, Akio Konishi, Takeshi Kijima
  • Publication number: 20110217454
    Abstract: A method for manufacturing a piezoelectric film includes: forming a piezoelectric precursor film including Bi, Fe, Mn, Ba, and Ti; and obtaining a piezoelectric film preferentially oriented with the (110) plane by crystallizing the piezoelectric precursor film.
    Type: Application
    Filed: March 1, 2011
    Publication date: September 8, 2011
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Yasuaki HAMADA