Patents by Inventor Hiromu Miyazawa

Hiromu Miyazawa 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 ELEMENT, LIQUID-EJECTING HEAD, AND LIQUID-EJECTING APPARATUS
    Publication number: 20110273516
    Abstract: A piezoelectric element includes a piezoelectric layer and electrodes provided to the piezoelectric layer. The piezoelectric layer consists of a complex oxide containing bismuth, cerium, iron and cobalt and the molar ratio of cobalt to the total of iron and cobalt is 0.125 or more and 0.875 or less.
    Type: Application
    Filed: May 4, 2011
    Publication date: November 10, 2011
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Hiromu MIYAZAWA
  • LIQUID EJECTING HEAD, LIQUID EJECTING APPARATUS, AND PIEZOELECTRIC ELEMENT
    Publication number: 20110273519
    Abstract: A liquid ejecting head includes a pressure-generating chamber in fluid communication with a nozzle opening and a piezoelectric element having a piezoelectric layer and electrodes provided to the piezoelectric layer. The piezoelectric layer is composed of a complex oxide having a perovskite structure containing bismuth and cerium in the A site of the perovskite structure and at least one metallic element selected from the group consisting of iron, cobalt, and chromium in the B site of the perovskite structure, and the molar ratio of the metallic element or elements in the B site, the bismuth, and the cerium is 1:(1?x):(3x/4).
    Type: Application
    Filed: May 6, 2011
    Publication date: November 10, 2011
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Hiromu MIYAZAWA
  • LIQUID EJECTION HEAD
    Publication number: 20110221831
    Abstract: A liquid ejection head, comprises a pressure generation chamber communicating with a nozzle opening and a piezoelectric element having a piezoelectric layer and an electrodes. The piezoelectric layer is a perovskite type complex oxide containing bismuth, iron, and cerium. The piezoelectric layer contains the cerium in a proportion of 0.01 mol % or more and 0.13 mol % or lower based on the total amount of the bismuth and the cerium.
    Type: Application
    Filed: March 11, 2011
    Publication date: September 15, 2011
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Takayuki Yonemura, Hiromu Miyazawa
  • LIQUID EJECTION HEAD AND LIQUID EJECTION APPARATUS
    Publication number: 20110169896
    Abstract: A liquid ejection head comprising a flow-channel-containing substrate having pressure generating chambers communicating a nozzle opening and a piezoelectric element including a first electrode, a piezoelectric layer formed above the first electrode, and a second electrode formed above the piezoelectric layer. The piezoelectric layer includes an active portion which is substantially driven, a non-active portion which is not substantially driven, and a low dielectric material layer which has a dielectric constant lower than that of a center portion of the active portion and which is in the active portion side of the boundary between the active portion and the non-active portion.
    Type: Application
    Filed: January 11, 2011
    Publication date: July 14, 2011
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Hiromu Miyazawa, Hiroshi Ito, Jiro Kato
  • LIQUID EJECTING HEAD AND LIQUID EJECTING APPARATUS
    Publication number: 20110148991
    Abstract: A liquid ejecting head includes a flow channel forming substrate having a pressure generation chamber communicating with a nozzle opening and arranged in parallel along a lateral direction. A piezoelectric element is provided on one surface of the flow channel forming substrate in correspondence to the pressure generation chamber, and has a first electrode, a piezoelectric layer provided on the first electrode and a second electrode provided on the piezoelectric layer. In a direction intersecting with the arrangement direction of the pressure generation chamber, in boundaries between an active section that is a substantial driving section and an inactive section that is not a substantial driving section of the piezoelectric layer of the first electrode, an opening group is provided including at least one opening in the active section and the inactive section.
    Type: Application
    Filed: December 21, 2010
    Publication date: June 23, 2011
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Hiromu MIYAZAWA, Hiroshi ITO, Jiro KATO, Toshihiro Shimizu
  • PIEZOELECTRIC ELEMENT, LIQUID JET HEAD AND PRINTER
    Publication number: 20110148992
    Abstract: A piezoelectric element includes: a base substrate; a lower electrode formed above the base substrate; a piezoelectric layer that is formed above the lower electrode, and formed from a perovskite type oxide; and an upper electrode formed above the piezoelectric layer, wherein the piezoelectric layer is oriented to (100) crystal orientation in the pseudo-cubic crystal expression, and a crystal of the perovskite type oxide in a direction parallel to a lower surface of the piezoelectric layer has a lattice constant greater than a lattice constant of the crystal of the perovskite type oxide in a direction orthogonal to the lower surface of the piezoelectric layer.
    Type: Application
    Filed: February 25, 2011
    Publication date: June 23, 2011
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Hiromu MIYAZAWA, Taku AOYAMA, Jiro KATO, Koji OHASHI
  • LIQUID EJECTING HEAD AND LIQUID EJECTING APPARATUS
    Publication number: 20110148990
    Abstract: A liquid ejecting head includes a flow channel forming substrate having pressure generation chambers communicating with a nozzle opening and arranged in parallel along a lateral direction. A piezoelectric element is provided on one surface of the flow channel forming substrate in correspondence to the pressure generation chamber, and has a first electrode, a piezoelectric layer provided on the first electrode and a second electrode provided on the piezoelectric layer. In a direction intersecting with the arrangement direction of the pressure generation chambers, in boundaries between an active section that is a substantial driving section and an inactive section that is not a substantial driving section of the piezoelectric layer, the first electrode includes a taper section of which a width is gradually decreased toward the boundary from the active section side.
    Type: Application
    Filed: December 21, 2010
    Publication date: June 23, 2011
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Hiromu MIYAZAWA, Hiroshi ITO, Jiro KATO, Eiju HIRAI, Toshihiro SHIMIZU
  • LIQUID-EJECTING HEAD, LIQUID-EJECTING APPARATUS, PIEZOELECTRIC ELEMENT, AND PIEZOELECTRIC MATERIAL
    Publication number: 20110102517
    Abstract: A liquid-ejecting head includes a pressure-generating chamber communicating with a nozzle opening, and a piezoelectric element. The piezoelectric layer contains a perovskite complex oxide containing Bi, La, Fe, and Mn and is ferroelectric.
    Type: Application
    Filed: October 28, 2010
    Publication date: May 5, 2011
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Takayuki YONEMURA, Hiromu MIYAZAWA
  • LIQUID-EJECTING HEAD, LIQUID-EJECTING APPARATUS, PIEZOELECTRIC ELEMENT, AND PIEZOELECTRIC MATERIAL
    Publication number: 20110102518
    Abstract: A liquid-ejecting head includes a pressure-generating chamber communicating with a nozzle opening, and a piezoelectric element. The piezoelectric element has piezoelectric layer contains a perovskite complex oxide containing Bi, La, Fe, and Mn and can undergo electric-field-induced phase transition.
    Type: Application
    Filed: October 28, 2010
    Publication date: May 5, 2011
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Takayuki YONEMURA, Hiromu MIYAZAWA
  • DROPLET-EJECTING HEAD, DROPLET-EJECTING APPARATUS, AND PIEZOELECTRIC ELEMENT
    Publication number: 20110074890
    Abstract: A droplet-ejecting head including a substrate including a pressure chamber communicating with a nozzle hole and also a piezoelectric element that includes a lower electrode, a piezoelectric layer which is formed above the lower electrode, and an upper electrode formed above the piezoelectric element and that causes a change in pressure in a liquid contained in the pressure chamber. The piezoelectric layer includes a first piezoelectric sub-layer located on the lower electrode and a second piezoelectric sub-layer located between the first piezoelectric sub-layer and the upper electrode. The first piezoelectric sub-layer has a polarization axis predominantly directed in an in-plane direction of the first piezoelectric sub-layer. The second piezoelectric sub-layer is predominantly (100)-oriented in the pseudocubic coordinate system.
    Type: Application
    Filed: September 28, 2010
    Publication date: March 31, 2011
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Hiromu MIYAZAWA, Koichi MOROZUMI
  • Piezoelectric device, its manufacturing method, liquid ejection head, and printer
    Patent number: 7874653
    Abstract: A piezoelectric device includes a substrate composed of a (110) single crystal silicon, a driver IC formed in the substrate, and a piezoelectric device that is formed above the substrate and is driven by the driver IC, wherein the driver IC has an analog switch including a transistor, the transistor having a channel direction in <001> orientation of the substrate.
    Type: Grant
    Filed: February 26, 2009
    Date of Patent: January 25, 2011
    Assignee: Seiko Epson Corporation
    Inventors: Hiromu Miyazawa, Toshihito Takagi
  • LIQUID-EJECTING HEAD, LIQUID-EJECTING APPARATUS, AND PIEZOELECTRIC ELEMENT
    Publication number: 20110012963
    Abstract: A liquid-ejecting head includes a pressure-generating chamber that communicates with a nozzle opening and a piezoelectric element. The piezoelectric element includes a first electrode; a piezoelectric body layer formed on the first electrode; and a second electrode formed on the piezoelectric body layer on a side opposite the first electrode. In the liquid-ejecting head, the piezoelectric body layer has a perovskite structure and an insulating property, and an A-site and an oxygen site of the perovskite structure respectively include a vacancy formed by losing an A-site metal and a vacancy formed by losing an oxygen atom, each of the vacancies including a hydrogen atom.
    Type: Application
    Filed: July 7, 2010
    Publication date: January 20, 2011
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Hiromu MIYAZAWA, Ichiro ASAOKA
  • METHOD FOR PRODUCING LIQUID EJECTING HEAD, LIQUID EJECTING HEAD, AND LIQUID EJECTING DEVICE
    Publication number: 20100214370
    Abstract: A liquid ejecting head has a piezoelectric element with a first electrode, a piezoelectric layer, and a second electrode. The liquid ejecting head causes pressure changes in a pressure generating chamber communicating with a nozzle opening. The piezoelectric layer has a perovskite structure and is preferentially orientated in a (100) plane. A method for producing the liquid ejecting head includes polarizing the piezoelectric layer by applying an electric field having energy higher than energy required for converting the polarization direction in the <111> direction to the <110> direction and lower than energy required for converting the polarization direction in the <111> direction to the <001> direction when the electric field to be applied to the piezoelectric layer is in the <001> direction vertical to a plane on which the second electrode is provided.
    Type: Application
    Filed: February 16, 2010
    Publication date: August 26, 2010
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Hiromu MIYAZAWA
  • LIQUID-EJECTING HEAD, LIQUID-EJECTING APPARATUS AND ACTUATOR DEVICE
    Publication number: 20100091075
    Abstract: A liquid-ejecting head including a pressure-generating chamber communicating with an nozzle, and a piezoelectric element having a first electrode, a piezoelectric layer arranged above the first electrode, and a second electrode arranged above the piezoelectric layer. An internal electric field in the piezoelectric layer is biased toward the first electrode or the second electrode and no voltage is applied to the first electrode or the second electrode.
    Type: Application
    Filed: October 9, 2009
    Publication date: April 15, 2010
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Hiromu MIYAZAWA, Hiroshi ITO, Koichi MOROZUMI, Jiro KATO
  • LIQUID EJECTING HEAD, LIQUID EJECTING APPARATUS, AND ACTUATOR DEVICE
    Publication number: 20100085403
    Abstract: A liquid ejecting head including a pressure-generating chamber which communicates with a nozzle opening, and a piezoelectric element including a first electrode, a piezoelectric layer formed above the first electrode and having a perovskite structure represented by the general formula ABO3, and a second electrode formed above the piezoelectric layer, wherein the piezoelectric layer, lead, zirconium, and titanium are present at A sites of the perovskite structure, and lead, zirconium, and titanium are present at B sites of the perovskite structure.
    Type: Application
    Filed: October 5, 2009
    Publication date: April 8, 2010
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Hiromu MIYAZAWA, Jiro KATO
  • LIQUID EJECTING HEAD, LIQUID EJECTING APPARATUS AND ACTUATOR DEVICE
    Publication number: 20100073435
    Abstract: A liquid ejecting head including a fluid channel forming substrate including a pressure generating chamber communicating with a nozzle opening that ejects a liquid droplet and a piezoelectric element. The piezoelectric element has a first electrode, a piezoelectric material layer that is provided on the first electrode and has a perovskite monoclinic structure, and a second electrode formed on the piezoelectric material layer opposite to the first electrode. An angle formed between a direction of an electric field generated between the first and second electrodes and an orientation of a polarization moment of the piezoelectric material layer is greater than an angle formed between the direction of the electric field at a time when the piezoelectric constant of the piezoelectric material layer reaches a maximum level and the orientation of the polarization moment.
    Type: Application
    Filed: September 18, 2009
    Publication date: March 25, 2010
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Hiromu MIYAZAWA, Hiroshi ITO, Koichi MOROZUMI, Jiro KATO
  • Liquid jet head and its manufacturing method
    Patent number: 7648229
    Abstract: A liquid jet head includes: a substrate; a pressure generation chamber provided in the substrate; an elastic plate provided above the substrate; a capacitor structure section provided above the elastic plate, the capacitor structure section including a lower electrode layer, a piezoelectric layer and an upper electrode layer; a porous layer provided above the capacitor structure section; a seal layer provided on the porous layer; and a void section formed between the capacitor structure section and the porous layer.
    Type: Grant
    Filed: July 31, 2007
    Date of Patent: January 19, 2010
    Assignee: Seiko Epson Corporation
    Inventors: Hiromu Miyazawa, Masao Nakayama
  • Piezoelectric material and piezoelectric device
    Patent number: 7586234
    Abstract: A piezoelectric material is expressed by a general formula (1) as follows: (Bi1?xBax)(Fe1?xTix)O3 . . . (1), where x is greater than 0, but smaller than 1 (0<x<1).
    Type: Grant
    Filed: April 10, 2007
    Date of Patent: September 8, 2009
    Assignee: Seiko Epson Corporation
    Inventors: Hiromu Miyazawa, Mayumi Hamada
  • PIEZOELECTRIC DEVICE, ITS MANUFACTURING METHOD, LIQUID EJECTION HEAD, AND PRINTER
    Publication number: 20090219348
    Abstract: A piezoelectric device includes a substrate composed of a (110) single crystal silicon, a driver IC formed in the substrate, and a piezoelectric device that is formed above the substrate and is driven by the driver IC, wherein the driver IC has an analog switch including a transistor, the transistor having a channel direction in <001> orientation of the substrate.
    Type: Application
    Filed: February 26, 2009
    Publication date: September 3, 2009
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Hiromu Miyazawa, Toshihito Takagi
  • Ferroelectric film, method of manufacturing ferroelectric film, ferroelectric capacitor, and ferroelectric memory
    Patent number: 7569400
    Abstract: A ferroelectric film having a ferroelectric shown by a general formula (Pb1-dBid)(B1-aXa)O3, B including at least one of Zr and Ti, X including at least one of Nb and Ta, “a” being in a range of “0.05?a?0.4”, and “d” being in a range of “0<d<1”.
    Type: Grant
    Filed: December 22, 2005
    Date of Patent: August 4, 2009
    Assignee: Seiko Epson Corporation
    Inventors: Takeshi Kijima, Yasuaki Hamada, Tomokazu Kobayashi, Hiromu Miyazawa