Patents by Inventor Kenji Shimao

Kenji Shimao 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: 20210135650
    Abstract: A piezoelectric device includes a container and an AT-cut crystal element. The AT-cut crystal element has at least one side surface intersecting with a Z?-axis of the crystallographic axis of the crystal constituted of three surfaces. The first surface is a surface equivalent to a surface formed by rotating the principal surface by 4°±3.5° with an X-axis of the crystal as a rotation axis. The second surface is a surface equivalent to a surface formed by rotating the principal surface by ?57°±5° with the X-axis. The third surface is a surface equivalent to a surface formed by rotating the principal surface by ?42°±5° with the X-axis. When two corner portions on a side of a second side opposed to the first side of the AT-cut crystal element are viewed in plan view, each of the two corner portions have an approximately right angle.
    Type: Application
    Filed: October 27, 2020
    Publication date: May 6, 2021
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: KENJI SHIMAO, Tetsuya WATANABE, Koji TOSHIKAWA, Hirokazu IWATA
  • Patent number: 10659005
    Abstract: An AT-cut crystal element is provided. The AT-cut crystal element includes side surfaces intersecting with a Z?-axis of a crystallographic axis of a crystal. At least one side surface of the side surfaces is constituted of three surfaces of a first surface to a third surface. Besides, a crystal resonator including the AT-cut crystal element, and a crystal unit including the crystal resonator are provided.
    Type: Grant
    Filed: March 31, 2016
    Date of Patent: May 19, 2020
    Assignee: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Takayuki Kuwahara, Kenji Shimao, Hirokazu Iwata
  • Patent number: 10333489
    Abstract: A crystal unit includes an AT-cut crystal element and a container. The AT-cut crystal element has an approximately rectangular planar shape. The AT-cut crystal element includes a first inclined portion, second inclined portions, and a first secured portion. The first inclined portion is inclined such that the crystal element decreases in thickness from a proximity of the first side to the first side. The second inclined portions are disposed on respective both ends of the first side, the second inclined portions being formed integrally with the first inclined portion. The second inclined portions are inclined gentler than the first inclined portion. The first secured portion and a second secured portion are formed integrally with the second inclined portion. The first secured portion and the second secured portion each project out from the first side to outside the crystal element to be used for securing with the securing members.
    Type: Grant
    Filed: September 1, 2016
    Date of Patent: June 25, 2019
    Assignee: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Kenji Shimao, Yoshiharu Sato, Hirokazu Iwata
  • Patent number: 10263597
    Abstract: A crystal unit includes an AT-cut crystal element, excitation electrodes, extraction electrodes. The AT-cut crystal element has an approximately rectangular planar shape. The excitation electrodes are disposed on front and back of principal surfaces of the AT-cut crystal element. The extraction electrodes are extended from the excitation electrodes to a side of one side of the AT-cut crystal element via a side surface of the AT-cut crystal element. Assuming that an extraction angle of the extraction electrode from the principal surface to the side surface is defined as an angle ? with respect to an X-axis of a crystallographic axis of a crystal, the angle ? is equal to or greater than 59 degrees and equal to or less than 87 degrees.
    Type: Grant
    Filed: September 1, 2016
    Date of Patent: April 16, 2019
    Assignee: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Yoshiharu Sato, Kenji Shimao, Hirokazu Iwata
  • Publication number: 20170070206
    Abstract: A crystal unit includes an AT-cut crystal element, excitation electrodes, extraction electrodes. The AT-cut crystal element has an approximately rectangular planar shape. The excitation electrodes are disposed on front and back of principal surfaces of the AT-cut crystal element. The extraction electrodes are extended from the excitation electrodes to a side of one side of the AT-cut crystal element via a side surface of the AT-cut crystal element. Assuming that an extraction angle of the extraction electrode from the principal surface to the side surface is defined as an angle ? with respect to an X-axis of a crystallographic axis of a crystal, the angle ? is equal to or greater than 59 degrees and equal to or less than 87 degrees.
    Type: Application
    Filed: September 1, 2016
    Publication date: March 9, 2017
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Yoshiharu SATO, Kenji SHIMAO, Hirokazu IWATA
  • Publication number: 20170070207
    Abstract: A crystal unit includes an AT-cut crystal element and a container. The AT-cut crystal element has an approximately rectangular planar shape. The AT-cut crystal element includes a first inclined portion, second inclined portions, and a first secured portion. The first inclined portion is inclined such that the crystal element decreases in thickness from a proximity of the first side to the first side. The second inclined portions are disposed on respective both ends of the first side, the second inclined portions being formed integrally with the first inclined portion. The second inclined portions are inclined gentler than the first inclined portion. The first secured portion and a second secured portion are formed integrally with the second inclined portion. The first secured portion and the second secured portion each project out from the first side to outside the crystal element to be used for securing with the securing members.
    Type: Application
    Filed: September 1, 2016
    Publication date: March 9, 2017
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Kenji SHIMAO, Yoshiharu SATO, Hirokazu IWATA
  • Publication number: 20160294356
    Abstract: An AT-cut crystal element is provided. The AT-cut crystal element includes side surfaces intersecting with a Z?-axis of a crystallographic axis of a crystal. At least one side surface of the side surfaces is constituted of three surfaces of a first surface to a third surface. Besides, a crystal resonator including the AT-cut crystal element, and a crystal unit including the crystal resonator are provided.
    Type: Application
    Filed: March 31, 2016
    Publication date: October 6, 2016
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Takayuki KUWAHARA, Kenji SHIMAO, Hirokazu IWATA
  • Patent number: 9018826
    Abstract: A mesa-type quartz-crystal vibrating piece includes a vibrator in a quadrangular shape with both main surfaces, a pair of excitation electrodes on both the main surfaces, a thin portion outside of the quadrangular shape, and a pair of extraction electrodes. The thin portion has a thickness thinner than a thickness of the vibrator. The pair of extraction electrodes are extracted from the excitation electrodes to a predetermined direction. A center of a first length in the predetermined direction of the excitation electrode is decentered from a center of a second length in the predetermined direction. The second length includes a length of the vibrator and a length of the thin portion. The center of the first length is decentered toward an opposite side of the extraction electrode by 25 ?m to 65 ?m.
    Type: Grant
    Filed: August 14, 2012
    Date of Patent: April 28, 2015
    Assignee: Nihon Dempa Kogyo Co., Ltd.
    Inventors: Hiroyuki Sasaki, Kenji Shimao, Manabu Ishikawa
  • Patent number: 8580126
    Abstract: An exemplary method for a producing a piezoelectric vibrating piece having at least one mesa step includes forming a metal film on a main surface of a piezoelectric wafer. A through-groove is formed through the thickness of the wafer to form a plan profile of a desired piezoelectric substrate. A film of photoresist is formed on the surface of the metal film. A resist is applied, exposed, and formed into a resist pattern that defines a first mesa step along at least a portion of the plan profile. In regions not protected by the metal film, the piezoelectric substrate is etched to a defined depth to form a mesa step. The denuded edge surface of the metal film is edge-etched. A second mesa step, inboard of the first mesa step, can be formed by repeating the edge-etching and substrate-etching steps using the metal film as an etch protective film.
    Type: Grant
    Filed: February 18, 2011
    Date of Patent: November 12, 2013
    Assignee: Nihon Dempa Kogyo Co., Ltd.
    Inventors: Hiroyuki Sasaki, Kenji Shimao, Manabu Ishikawa
  • Patent number: 8541928
    Abstract: Quartz-crystal devices are disclosed, of which the CI value is reduced by adjusting the shortest distance between an edge of electrically conductive adhesive and an edge of the excitation electrode. The device has a quartz-crystal plate having long-edges and short-edges. Excitation electrodes are on first and second surfaces of the plate. Conductive pads are electrically connected to respective excitation electrodes and extend to the short-edge of the quartz-crystal plate. A package having a pair of external mounting terminals and respective connecting electrodes are situated on opposing sides of the mounting terminals for making electrical connections to the mounting terminals. An electrically conductive adhesive bonds the connecting terminals and respective conductive pads together, and the quartz-crystal plate onto the package. The shortest distance between an edge of the adhesive and an edge of the excitation electrode is 10%-15% the length of the quartz-crystal plate in the long-edge direction.
    Type: Grant
    Filed: March 13, 2012
    Date of Patent: September 24, 2013
    Assignee: Nihon Dempa Kogyo Co., Ltd.
    Inventors: Kenji Shimao, Takehiro Takahashi, Hiroyuki Sasaki, Manabu Ishikawa, Shinobu Yoshida
  • Patent number: 8525394
    Abstract: To provide an AT-cut quartz-crystal vibrating piece in which size of the vibrating unit is adjusted to appropriate value, so that the unnecessary vibration is inhibited and degradation of its characteristics is prevented. A mesa-type AT-cut quartz-crystal vibrating piece for vibrating at 38.400 MHz comprising a rectangular excitation unit (31) and a peripheral region (32) formed on the periphery of the excitation unit and having a thickness less than the thickness of the excitation unit, is represented by the following equation: Mx/Gx=0.09×n?0.06 (n: natural number) . . . (1). Length of a crystallographic x-axis direction of the excitation unit is defined as Mx (mm) and length of the crystallographic x-axis direction of the peripheral region and excitation unit is defined as Gx (mm).
    Type: Grant
    Filed: September 1, 2011
    Date of Patent: September 3, 2013
    Assignee: Nihon Dempa Kogyo Co., Ltd.
    Inventors: Manabu Ishikawa, Kenji Shimao, Hiroyuki Sasaki
  • Patent number: 8519601
    Abstract: A crystal device and an inspection method for inspecting the crystal device are provided. The crystal device includes: a crystal plate; excitation electrodes formed on the crystal plate; extraction electrodes extending from the excitation electrodes; electrode pads electrically connected with the extraction electrodes; a package including mounting terminals formed on a mounting surface and connection terminals formed on a bottom surface, which is on the other side of the mounting surface, and electrically connected with the mounting terminals; and an electrically-conductive adhesive agent bonding and fixing the connection terminals to the electrode pads. An bonding status inspection region, on which no metal film is formed, is formed in the crystal plate, and the bonding status inspection region is surrounded by or adjacent to the electrode pads. In addition, the bonding status inspection region occupies not more than 25% of the area of the electrode pads.
    Type: Grant
    Filed: March 22, 2012
    Date of Patent: August 27, 2013
    Assignee: Nihon Dempa Kogyo Co., Ltd.
    Inventors: Kenji Shimao, Manabu Ishikawa, Hiroyuki Sasaki
  • Patent number: 8415858
    Abstract: Piezoelectric vibrating pieces are disclosed having selectively roughened surfaces. An exemplary piece is made of a piezoelectric material configured as a piezoelectric substrate. The piece also includes at least one excitation electrode and at least one extraction electrode. The substrate has opposing main surfaces initially having low surface roughness. At least one main surface is formed in a mesa or reverse mesa manner, wherein the central region has a different thickness than the peripheral region. The central region has relatively low surface roughness (irregular unevenness), while the peripheral region has relatively high surface roughness. The excitation electrode is formed on the central region (mesa or reverse mesa) while the extraction electrode (connected to the excitation electrode) is formed on the peripheral region.
    Type: Grant
    Filed: February 18, 2011
    Date of Patent: April 9, 2013
    Assignee: Nihon Dempa Kogyo Co., Ltd.
    Inventors: Manabu Ishikawa, Kenji Shimao, Hiroyuki Sasaki, Mitoshi Umeki, Kenichi Kikuchi
  • Patent number: 8405286
    Abstract: The present disclosure provides a mesa-type AT-cut quartz-crystal vibrating piece, in which amount of the vibrating unit is adjusted to appropriate amount, in order to inhibit unnecessary vibration and to prevent degradation. The mesa-type AT-cut quartz-crystal vibrating piece (30) for vibrating piece vibrates at 38.400 MHz comprises a rectangular excitation unit (31), a peripheral region (32) formed in periphery of the excitation unit and thinner than the excitation unit. The thickness difference h (?m) between one principal surface of the excitation unit and the adjacent peripheral region is obtained by the following equation: h=(0.2×Mx)?143 The length of the x-axis direction of the crystallographic X-axis is Mx (?m).
    Type: Grant
    Filed: August 4, 2011
    Date of Patent: March 26, 2013
    Assignee: Nihon Dempa Kogyo Co., Ltd.
    Inventors: Kenji Shimao, Manabu Ishikawa, Hiroyuki Sasaki
  • Patent number: 8390176
    Abstract: An object of the invention is to provide a method of manufacturing a stacked crystal resonator whereby a large number of stacked crystal resonators formed on a wafer can be easily broken away from the wafer, and the risk of damage to the outside surfaces and the like of the stacked crystal resonators is reduced. There is formed a framed crystal plate connected to a first wafer by a first support section, a cover connected to a second wafer by a second support section, and a base connected to a third wafer by a third support section, and a thickness of at least one of the first support section through third support section is thinner than a thickness the connected wafer.
    Type: Grant
    Filed: August 25, 2010
    Date of Patent: March 5, 2013
    Assignee: Nihon Dempa Kogyo Co., Ltd.
    Inventor: Kenji Shimao
  • Publication number: 20130043771
    Abstract: A mesa-type quartz-crystal vibrating piece includes a vibrator in a quadrangular shape with both main surfaces, a pair of excitation electrodes on both the main surfaces, a thin portion outside of the quadrangular shape, and a pair of extraction electrodes. The thin portion has a thickness thinner than a thickness of the vibrator. The pair of extraction electrodes are extracted from the excitation electrodes to a predetermined direction. A center of a first length in the predetermined direction of the excitation electrode is decentered from a center of a second length in the predetermined direction. The second length includes a length of the vibrator and a length of the thin portion. The center of the first length is decentered toward an opposite side of the extraction electrode by 25 ?m to 65 ?m.
    Type: Application
    Filed: August 14, 2012
    Publication date: February 21, 2013
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: HIROYUKI SASAKI, KENJI SHIMAO, MANABU ISHIKAWA
  • Publication number: 20120242193
    Abstract: Quartz-crystal devices are disclosed, of which the CI value is reduced by adjusting the shortest distance between an edge of electrically conductive adhesive and an edge of the excitation electrode. The device has a quartz-crystal plate having long-edges and short-edges. Excitation electrodes are on first and second surfaces of the plate. Conductive pads are electrically connected to respective excitation electrodes and extend to the short-edge of the quartz-crystal plate. A package having a pair of external mounting terminals and respective connecting electrodes are situated on opposing sides of the mounting terminals for making electrical connections to the mounting terminals. An electrically conductive adhesive bonds the connecting terminals and respective conductive pads together, and the quartz-crystal plate onto the package. The shortest distance between an edge of the adhesive and an edge of the excitation electrode is 10%-15% the length of the quartz-crystal plate in the long-edge direction.
    Type: Application
    Filed: March 13, 2012
    Publication date: September 27, 2012
    Inventors: Kenji SHIMAO, Takehiro TAKAHASHI, Hiroyuki SASAKI, Manabu ISHIKAWA, Shinobu YOSHIDA
  • Publication number: 20120242195
    Abstract: A crystal device and an inspection method for inspecting the crystal device are provided. The crystal device includes: a crystal plate; excitation electrodes formed on the crystal plate; extraction electrodes extending from the excitation electrodes; electrode pads electrically connected with the extraction electrodes; a package including mounting terminals formed on a mounting surface and connection terminals formed on a bottom surface, which is on the other side of the mounting surface, and electrically connected with the mounting terminals; and an electrically-conductive adhesive agent bonding and fixing the connection terminals to the electrode pads. An bonding status inspection region, on which no metal film is formed, is formed in the crystal plate, and the bonding status inspection region is surrounded by or adjacent to the electrode pads. In addition, the bonding status inspection region occupies not more than 25% of the area of the electrode pads.
    Type: Application
    Filed: March 22, 2012
    Publication date: September 27, 2012
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: KENJI SHIMAO, MANABU ISHIKAWA, HIROYUKI SASAKI
  • Publication number: 20120056514
    Abstract: To provide an AT-cut quartz-crystal vibrating piece in which size of the vibrating unit is adjusted to appropriate value, so that the unnecessary vibration is inhibited and degradation of its characteristics is prevented. A mesa-type AT-cut quartz-crystal vibrating piece for vibrating at 38.400 MHz comprising a rectangular excitation unit (31) and a peripheral region (32) formed on the periphery of the excitation unit and having a thickness less than than the thickness of the excitation unit, is represented by the following equation: Mx/Gx=0.09×n?0.06 (n: natural number)??(1) Length of a crystallographic x-axis direction of the excitation unit is defined as Mx (mm) and length of the crystallographic x-axis direction of the peripheral region and excitation unit is defined as Gx (mm).
    Type: Application
    Filed: September 1, 2011
    Publication date: March 8, 2012
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Manabu Ishikawa, Kenji Shimao, Hiroyuki Sasaki
  • Publication number: 20120032563
    Abstract: The present disclosure provides a mesa-type AT-cut quartz-crystal vibrating piece, in which amount of the vibrating unit is adjusted to appropriate amount, in order to inhibit unnecessary vibration and to prevent degradation. The mesa-type AT-cut quartz-crystal vibrating piece (30) for vibrating piece vibrates at 38.400 MHz comprises a rectangular excitation unit (31), a peripheral region (32) formed in periphery of the excitation unit and thinner than the excitation unit. The thickness difference h (?m) between one principal surface of the excitation unit and the adjacent peripheral region is obtained by the following equation: h=(0.2×Mx)?143 The length of the x-axis direction of the crystallographic X-axis is Mx (?m).
    Type: Application
    Filed: August 4, 2011
    Publication date: February 9, 2012
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Kenji Shimao, Manabu Ishikawa, Hiroyuki Sasaki