Patents by Inventor Isao Ikeda

Isao Ikeda 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).

  • Patent number: 10787393
    Abstract: The present invention provides a silicon nitride sintered body including silicon nitride crystal grains and a grain boundary phase, wherein the silicon nitride crystal grains are covered with the grain boundary phase and width of the grain boundary phase is 0.2 nm or more. It is preferable that the width of the grain boundary phase is 0.2 nm to 5 nm. Additionally, it is preferable that the silicon nitride sintered body includes 15% by mass or less of the grain boundary phase. According to the above-described configuration, it is possible to provide a high-temperature-resistant silicon nitride sintered body in which degradation of the grain boundary phase under high temperature environment is suppressed. This silicon nitride sintered body is suitable for constituent material of a high-temperature-resistant member, use environment of which is 300° C. or higher.
    Type: Grant
    Filed: March 28, 2016
    Date of Patent: September 29, 2020
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.
    Inventors: Isao Ikeda, Kai Funaki, Yutaka Abe
  • Patent number: 10744592
    Abstract: The present invention provides a welding tool member for friction stir welding comprising a silicon nitride sintered body, wherein the silicon nitride sintered body includes an additive component other than silicon nitride in a content of 15% by mass or less, and the additive component includes three or more elements selected from Y, Al, Mg, Si, Ti, Hf, Mo and C. It is preferable that the content of the additive component is 3% by mass or more and 12.5% by mass or less. It is also preferable that the additive component includes four or more elements selected from Y, Al, Mg, Si, Ti, Hf, Mo and C. Due to above structure, there can be provided a welding tool member for friction stir welding having a high durability.
    Type: Grant
    Filed: August 28, 2015
    Date of Patent: August 18, 2020
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.
    Inventors: Isao Ikeda, Kai Funaki, Yutaka Abe
  • Publication number: 20200195226
    Abstract: A piezoelectric resonator unit includes a piezoelectric substrate, first and second excitation electrodes, first and second connecting electrodes, and first and second exterior members. The first excitation electrode and first connecting electrode are disposed on a first main surface of the piezoelectric substrate and are electrically connected to each other. Similarly, the second excitation electrode and the second connecting electrode are disposed on a second main surface of the piezoelectric substrate and are electrically connected to each other. First and second exterior members bonded to the substrate with sealing members interposed. The first exterior member includes a first terminal portion formed in a shape that externally exposes at least part of the first connecting electrode. A first outer electrode covers the first terminal portion and the exposed portion of the first connecting electrode protruding from the first exterior member.
    Type: Application
    Filed: February 25, 2020
    Publication date: June 18, 2020
    Inventors: Motoyoshi Sakai, Kazuyuki Noto, Jun Konishi, Isao Ikeda
  • Publication number: 20200014366
    Abstract: A quartz crystal resonator is provided that includes a body portion with first and second main surfaces facing each other and, in plan view has a pair of long sides extending in a first direction and a pair of short sides extending in a second intersecting direction. Moreover, first and second excitation electrodes are disposed on the first and second main surfaces respectively; a frame surrounds the body portion at both ends and is separated from the both ends; and first and second coupling portions extend from the short sides in the first direction with widths of the short sides. At least one of the first and second coupling portions has a portion whose thickness in a third direction is smaller than a thickness in the third direction of a region of the body portion where the first excitation electrode and the second excitation electrode face each other.
    Type: Application
    Filed: September 20, 2019
    Publication date: January 9, 2020
    Inventors: Isao Ikeda, Motonori Matsushita
  • Publication number: 20200014359
    Abstract: A method of forming a quartz crystal resonator is provided with the resonator including a body portion with first and second main surfaces facing each other and, in plan view having a pair of long sides extending in a first direction and a pair of short sides extending in a second intersecting direction. Moreover, first and second excitation electrodes are formed on the respective main surfaces; a frame surrounds the body portion at both ends and is separated from the both ends; and first and second coupling portions extend from the short sides and with widths of the short sides. At least one of the first and second coupling portions is formed with a thickness in a third direction is smaller than a thickness in the third direction of a region of the body portion where the first excitation electrode and the second excitation electrode face each other.
    Type: Application
    Filed: September 20, 2019
    Publication date: January 9, 2020
    Inventors: Isao Ikeda, Motonori Matsushita
  • Patent number: 10511282
    Abstract: A crystal-oscillating device is disclosed with a reduction in size and a favorable Q value. The crystal-oscillating device includes a first packaging material; a crystal resonator mounted on the first packaging material; joining members that join the first packaging material to the crystal resonator; a first sealing frame for joining the second and third packaging materials, the first packaging material, and the second packaging material; and a second sealing frame for joining the second packaging material and the third packaging material to each other. Preferable, the second packaging material is formed in a frame shape to surround an outer peripheral edge of the crystal resonator, and the second packaging material and a crystal substrate of the crystal resonator are formed from the same crystal substrate.
    Type: Grant
    Filed: October 10, 2016
    Date of Patent: December 17, 2019
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Isao Ikeda, Jinya Furui
  • Publication number: 20190210149
    Abstract: The friction stir welding tool member according to the present invention is made of a ceramic member in which a shoulder portion and a probe portion are integrally formed, wherein a root portion of the probe portion and an end portion of the shoulder portion have a curved surface shape; and the friction stir welding tool member has a ratio (R1/D) of 0.02 or more and 0.20 or less when a curvature radius of the end portion of the shoulder portion is defined as R1 (mm) and an outer diameter of the shoulder portion is defined as D (mm). In addition, the ceramic member is preferably made of a silicon nitride sintered body having a Vickers hardness of 1400 HV1 or more. According to the above-described configuration, a friction stir welding tool member having excellent durability can be provided.
    Type: Application
    Filed: August 4, 2017
    Publication date: July 11, 2019
    Applicants: OSAKA UNIVERSITY, TOSHIBA MATERIALS CO., LTD.
    Inventors: Hidetoshi FUJII, Yoshiaki MORISADA, Kai FUNAKI, Isao IKEDA, Yutaka ABE, Masahiro KATO
  • Publication number: 20190168337
    Abstract: The friction stir welding tool member according to the present invention is made of a silicon nitride sintered body, wherein the silicon nitride sintered body contains 15% by mass or less of additive components except silicon nitride in such a manner that the additive components include at least one element selected from lanthanoid elements and at least one element selected from Mg, Ti, Hf, and Mo. In addition, it is preferable that the additive components further include at least one element selected from Al, Si, and C. According to the above-described configuration, a friction stir welding tool member having an excellent durability can be provided.
    Type: Application
    Filed: August 4, 2017
    Publication date: June 6, 2019
    Applicants: OSAKA UNIVERSITY, TOSHIBA MATERIALS CO., LTD.
    Inventors: Hidetoshi FUJII, Yoshiaki MORISADA, Kai FUNAKI, Isao IKEDA, Yutaka ABE, Masahiro KATO
  • Publication number: 20180323768
    Abstract: A quartz crystal unit that includes a quartz crystal resonator with a quartz crystal blank on which a pair of excitation electrodes are formed, a frame body that surrounds an outer periphery of the blank, and a coupling member that couples the frame body to the blank. Moreover, a package member is joined to an entire periphery of the frame body on at least one side of the excitation electrodes; and an extension electrode is provided that is electrically connected to one of the excitation electrodes. A recess is formed in a junction region of at least one of the frame body and the package member. In the junction region, the extension electrode is disposed in the recess in such a way that the extension electrode has a thickness that does not exceed a depth of the recess.
    Type: Application
    Filed: July 11, 2018
    Publication date: November 8, 2018
    Inventors: ISAO IKEDA, Motonori Matsushita
  • Publication number: 20180134626
    Abstract: The present invention provides a silicon nitride sintered body including silicon nitride crystal grains and a grain boundary phase, wherein the silicon nitride crystal grains are covered with the grain boundary phase and width of the grain boundary phase is 0.2 nm or more. It is preferable that the width of the grain boundary phase is 0.2 nm to 5 nm. Additionally, it is preferable that the silicon nitride sintered body includes 15% by mass or less of the grain boundary phase. According to the above-described configuration, it is possible to provide a high-temperature-resistant silicon nitride sintered body in which degradation of the grain boundary phase under high temperature environment is suppressed. This silicon nitride sintered body is suitable for constituent material of a high-temperature-resistant member, use environment of which is 300° C. or higher.
    Type: Application
    Filed: March 28, 2016
    Publication date: May 17, 2018
    Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.
    Inventors: Isao IKEDA, Kai FUNAKI, Yutaka ABE
  • Publication number: 20170297141
    Abstract: The present invention provides a welding tool member for friction stir welding comprising a silicon nitride sintered body, wherein the silicon nitride sintered body includes an additive component other than silicon nitride in a content of 15% by mass or less, and the additive component includes three or more elements selected from Y, Al, Mg, Si, Ti, Hf, Mo and C. It is preferable that the content of the additive component is 3% by mass or more and 12.5% by mass or less. It is also preferable that the additive component includes four or more elements selected from Y, Al, Mg, Si, Ti, Hf, Mo and C. Due to above structure, there can be provided a welding tool member for friction stir welding having a high durability.
    Type: Application
    Filed: August 28, 2015
    Publication date: October 19, 2017
    Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.
    Inventors: Isao IKEDA, Kai FUNAKI, Yutaka ABE
  • Patent number: 7288116
    Abstract: This invention relates to enable a person to walk smoothly even if a length of a remained thigh of the lost leg is short or even if the leg is cut at the hip joint and has no thigh. The hucklebone supporting type artificial leg comprising the crotch support (1), the shaft part (21) arranged vertically at the lower surface of the crotch support (1) and having substantially the same length as that of the lower leg and a foot (22) fixed to the lower end of the shaft part (21), wherein the crotch support (1) is formed into a substantial L-shape as seen in its top plan view, one front end (2) is arranged at a front part so as to be applied to a substantial front half part of the crotch part when installed and at the same time, the other side end part (3) is arranged at the rear surface of the lost lower leg and applied to both the hucklebone and the hip part corresponding to the lost leg when installed.
    Type: Grant
    Filed: May 23, 2005
    Date of Patent: October 30, 2007
    Inventor: Isao Ikeda
  • Publication number: 20050278038
    Abstract: This invention relates to enable a person to walk smoothly even if a length of a remained thigh of the lost leg is short or even if the leg is cut at the hip joint and has no thigh. The hucklebone supporting type artificial leg comprising the crotch support (1), the shaft part (21) arranged vertically at the lower surface of the crotch support (1) and having substantially the same length as that of the lower leg and a foot (22) fixed to the lower end of the shaft part (21), wherein the crotch support (1) is formed into a substantial L-shape as seen in its top plan view, one front end (2) is arranged at a front part so as to be applied to a substantial front half part of the crotch part when installed and at the same time, the other side end part (3) is arranged at the rear surface of the lost lower leg and applied to both the hucklebone and the hip part corresponding to the lost leg when installed.
    Type: Application
    Filed: May 23, 2005
    Publication date: December 15, 2005
    Inventor: Isao Ikeda
  • Publication number: 20050102039
    Abstract: This invention enables a smooth walking action to be carried out even in the case that a length of the thigh portion left in the damaged or lost lower leg is short or in the case that the lower leg is cut from the crotch articulation part and the thigh is lost.
    Type: Application
    Filed: November 9, 2004
    Publication date: May 12, 2005
    Inventor: Isao Ikeda
  • Patent number: 6485830
    Abstract: In material for ceramic ball that has a spherical portion of approximate sphere at both ends thereof and a belt-like portion at a center thereof over an entire circumferential direction, a difference between a diagonal diameter of the belt-like portion and a polar diameter of the spherical portion is 100 &mgr;m or less. A height of the belt-like portion from the spherical portion is preferable to be 1 mm or less. A width of the belt-like portion is preferable to be 5 mm or less. The material for ceramic ball can be used for material for bearing balls for instance. When applying in such a usage, the material for ceramic ball essentially consists of silicon nitride, Vickers hardness thereof being preferable to be 1400 or more. In the material for ceramic ball of the present invention, a difference between a diagonal diameter of a belt-like portion and a polar diameter of a spherical portion is set at 100 &mgr;m or less.
    Type: Grant
    Filed: September 27, 2000
    Date of Patent: November 26, 2002
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hiroshi Komorita, Minoru Takao, Isao Ikeda, Hiroki Tonai
  • Patent number: 6475940
    Abstract: Wear resistant member for electronic equipment comprises a zirconium oxide sintered body of which specific resistance is in the range from 1 to 105 &OHgr;·m. A conductivity enhancer of which specific resistance is 10−5 &OHgr;·m or less is compounded to a zirconium oxide sintered body to materialize specific resistance from 1 to 105 &OHgr;·m. For a conductivity enhancer, carbides and nitrides of various kinds of metals can be used. Wear resistant member can be used as a bearing ball, being applied in a rotational driver of electronic equipment such as a magnetic recording device and an optical disk device. Deficiency due to static electricity of electronic equipment is cancelled due to specific resistance that a zirconium oxide sintered body has.
    Type: Grant
    Filed: May 16, 2001
    Date of Patent: November 5, 2002
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yukihiro Takenami, Isao Ikeda, Minoru Takao, Hiroki Tonai, Yoshiyuki Fukuda, Hisao Yabe, Michiyasu Komatsu
  • Patent number: 6366181
    Abstract: A group-delay-characteristics adjusting method allows group-delay characteristics of piezoelectric resonators to be easily adjusted without affecting the electrical characteristics thereof. Piezoelectric resonators are arranged on an insulating substrate and are connected in a ladder arrangement, thereby defining a piezoelectric filter. Silicon sheets, each of which has a Young modulus that is about 100 MPa or smaller, are prepared to adjust the group-delay characteristics of the piezoelectric resonators. Then, characteristics of the piezoelectric resonators are measured. The silicon sheets having a size that is appropriate to achieve the required group-delay characteristics are selected, and adhered onto the individual piezoelectric resonators.
    Type: Grant
    Filed: April 25, 2000
    Date of Patent: April 2, 2002
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Isao Ikeda
  • Publication number: 20020013211
    Abstract: Wear resistant member for electronic equipment comprises a zirconium oxide sintered body of which specific resistance is in the range from 1 to 105 &OHgr;·m. A conductivity enhancer of which specific resistance is 10−5 &OHgr;·m or less is compounded to a zirconium oxide sintered body to materialize specific resistance from 1 to 105 &OHgr;·m. For a conductivity enhancer, carbides and nitrides of various kinds of metals can be used. Wear resistant member can be used as a bearing ball, being applied in a rotational driver of electronic equipment such as a magnetic recording device and an optical disk device. Deficiency due to static electricity of electronic equipment is cancelled due to specific resistance that a zirconium oxide sintered body has.
    Type: Application
    Filed: May 16, 2001
    Publication date: January 31, 2002
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yukihiro Takenami, Isao Ikeda, Minoru Takao, Hiroki Tonai, Yoshiyuki Fukuda, Hisao Yabe, Michiyasu Komatsu
  • Patent number: 6083604
    Abstract: The present invention relates to a bonded assembly characterized in that a board having a convexed portion on a jointing surface thereof and a board having, on a jointing surface thereof, a concaved portion or a through hole to be engaged with the convexed portion are jointed with adhesives. Also, the present invention relates to a bonded assembly characterized in that an adhesive is coated on the portion other than the convexed portion of the board so that the coating thickness is smaller than the height of the convexed portion, and then the board is jointed to another board having a concaved portion or a through hole, after making alignment of the boards. Further, the present invention relates to a rivet having means for fitting to and temporarily fixing to an inserting through hole, and a method of jointing boards which comprises a step for inserting, fitting and temporarily fixing the rivet having the means for temporarily fixing to the inserting through hole on the board.
    Type: Grant
    Filed: October 19, 1995
    Date of Patent: July 4, 2000
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kosuke Haraga, Naoki Yagi, Yoshinobu Nakashima, Yuzi Ganryu, Tsutomu Sasaki, Atsushi Takimoto, Yosiro Komazawa, Asao Okuda, Shoji Takagi, Akifumi Matsukawa, Hideaki Urata, Yasushi Kawashima, Kazumi Masuo, Kenji Honma, Isao Ikeda
  • Patent number: 5883458
    Abstract: A terminal for a piezoelectric device has a first contact portion and a second contact portion which are preferably formed as separate metallic elements. Each contact portion has a protrusion disposed thereon. A lubricant is located between the first contact portion and the second contact portion. The lubricant contains a hydrophilic group tending to form a hydrogen bond with a metal element and a lipophilic group extending in a straight chain from any such hydrogen bond and having a length at least several times that of the hydrophilic group. The lipophilic group has a molecular structure which urges away from the metallic surfaces of the contact portions.
    Type: Grant
    Filed: October 14, 1997
    Date of Patent: March 16, 1999
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Manabu Sumita, Sigemasa Kusabiraki, Isao Ikeda