Patents by Inventor Tsuyoshi Kashiwada

Tsuyoshi Kashiwada 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: 8917478
    Abstract: A bearing device has two or more bearings each having an inner ring and an outer ring disposed on the same axis. A ring-shaped holder is disposed between the inner ring and the outer ring and has circumferentially spaced-apart rolling element pockets with a concave grease pocket between each two adjacent rolling element pockets. Rolling elements are disposed in a rollable manner in respective ones of the rolling element pockets and a grease is stored in the grease pockets, the grease serving as a lubricant of the rolling element. The grease consists of at least a base oil comprised of aromatic carbon and a thickener, the content of the aromatic hydrocarbon being 70 weight % or more of the grease.
    Type: Grant
    Filed: September 30, 2013
    Date of Patent: December 23, 2014
    Assignee: Seiko Instruments Inc.
    Inventors: Kenji Suzuki, Tsuyoshi Kashiwada, Robert Gordon Smith, Virat Sornsiri
  • Publication number: 20140126085
    Abstract: A bearing device has two or more bearings each having an inner ring and an outer ring disposed on the same axis. A plurality of rolling elements are arranged in a ring-shaped region between the inner ring and the outer ring with a gap in a circumferential direction, and a plurality of rolling element pockets hold the rolling elements in a rollable manner at regular intervals from one another. A holder having a grease pocket of concave shape is placed between the rolling element pockets and stores grease serving as a lubricant of the rolling elements. The grease consists of at least a base oil comprised of aromatic carbon and a thickener, the content of the aromatic hydrocarbon being 70 weight % or more of the grease.
    Type: Application
    Filed: September 30, 2013
    Publication date: May 8, 2014
    Applicant: SEIKO INSTRUMENTS INC.
    Inventors: Kenji SUZUKI, Tsuyoshi Kashiwada, Robert Gordon Smith, Virat Sornsiri
  • Publication number: 20020164096
    Abstract: A problem of the invention resides in that in a hydrodynamic bearing apparatus for rotatably supporting a rotor by a hydrodynamic bearing, wear of the apparatus caused by sliding contact of dynamic pressure bearing faces in starting and stopping thereof is prevented to thereby promote durability, working of a dynamic pressure generating groove is facilitated and the bearing faces are prevented from being adsorbed to each other.
    Type: Application
    Filed: July 3, 2002
    Publication date: November 7, 2002
    Applicant: SEIKO INSTRUMENTS INC.
    Inventors: Tsuyoshi Kashiwada, Katsushige Konno, Kaoru Kaneko, Tadashi Kiyokawa, Hajime Kiyokawa
  • Patent number: 6447167
    Abstract: In a hydrodynamic bearing apparatus for rotatably supporting a rotor by a hydrodynamic bearing, wear of the apparatus caused by sliding contact of dynamic pressure bearing faces in starting and stopping thereof is prevented to thereby promote durability, working of a dynamic pressure generating groove is facilitated and the bearing faces are prevented from being adsorbed to each other. By providing a low friction metal layer having water repellency at dynamic pressure bearing portions of a hydrodynamic bearing apparatus, friction can be reduced, wear or dust formation can effectively be restrained and the bearing faces can be prevented from being adsorbed to each other by dew condensation.
    Type: Grant
    Filed: November 7, 2000
    Date of Patent: September 10, 2002
    Assignees: Seiko Instruments Inc., Kiyokawa Plating Industry Co., Ltd.
    Inventors: Tsuyoshi Kashiwada, Katsushige Konno, Kaoru Kaneko, Tadashi Kiyokawa, Hajime Kiyokawa
  • Patent number: 6400485
    Abstract: To provide an air-dynamic bearing apparatus having a radial dynamic bearing and thrust dynamic bearings by a small number of parts by using a material which is easy to fabricate and a polygon scanner motor using thereof, a rotor 26 made of a metal is supported by a small diameter portion 21A provided at a front end of a stator 21 made of a metal as a shaft portion by using an attaching hole 26A and a thrust plate 8 is fixed to an end portion of the small diameter portion 21A to thereby constitute bearing portions, low friction metal plating layers M1 through M3 are provided to respective bearing faces of the bearing portions, thereby, a radial dynamic bearing 51, a first thrust dynamic bearing 52 and a second thrust dynamic bearing 53 are formed.
    Type: Grant
    Filed: April 20, 2001
    Date of Patent: June 4, 2002
    Assignee: Seiko Instruments Inc.
    Inventors: Tsuyoshi Kashiwada, Kaoru Kaneko, Hirotada Shimaguchi
  • Publication number: 20010035998
    Abstract: To provide an air-dynamic bearing apparatus having a radial dynamic bearing and thrust dynamic bearings by a small number of parts by using a material which is easy to fabricate and a polygon scanner motor using thereof, a rotor 26 made of a metal is supported by a small diameter portion 21A provided at a front end of a stator 21 made of a metal as a shaft portion by using an attaching hole 26A and a thrust plate 8 is fixed to an end portion of the small diameter portion 21A to thereby constitute bearing portions, low friction metal plating layers M1 through M3 are provided to respective bearing faces of the bearing portions, thereby, a radial dynamic bearing 51, a first thrust dynamic bearing 52 and a second thrust dynamic bearing 53 are formed.
    Type: Application
    Filed: April 20, 2001
    Publication date: November 1, 2001
    Inventors: Tsuyoshi Kashiwada, Kaoru Kaneko, Hirotada Shimaguchi