Patents by Inventor Tomohiro Yoneda

Tomohiro Yoneda 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: 20190379255
    Abstract: A motor includes a shaft along a central axis, an inner ring fixed on an outer circumferential surface of the shaft, a tubular sleeve extending axially around the shaft, an outer ring fixed to an inner circumferential surface of the sleeve via an adhesive agent, a cap annularly expanding around the shaft and covering an axially upper side of the inner and outer rings, and a bearing portion including dynamic pressure grooves in at least one of an outer circumferential surface of the inner ring and the inner circumferential surface of the sleeve. In the bearing portion, a stationary portion and a rotating portion face each other across a gap where lubricating oil is present. At least one interface of the lubricating oil is in a radial gap between the inner and outer rings. The cap includes a recess recessed axially downward over an entire circumference. At least a portion of an outer circumferential surface of the recess portion is fixed by press-fitting to an inner circumferential surface of the sleeve.
    Type: Application
    Filed: June 5, 2019
    Publication date: December 12, 2019
    Inventors: Daisuke MORO, Tomohiro YONEDA, Hiroshi KOBAYASHI, Masayuki MAEDA
  • Patent number: 10460767
    Abstract: A base member is structured to define a portion of a casing in which a gas with a density lower than that of air is to be sealed and to support a motor to be housed in the casing. The base member includes a base body made of a cast material, an information mark, and an insulating coating layer. The information mark includes casting information and is located on a portion of a surface of the base body. The insulating coating layer is defined on the surface of the base body and covers the information mark.
    Type: Grant
    Filed: October 1, 2018
    Date of Patent: October 29, 2019
    Assignee: NIDEC CORPORATION
    Inventors: Tomohiro Yoneda, Takaharu Funatsu, Akitsugu Miwa, Masakazu Matsuyama, Junzo Fujinawa, Tadahiro Kuramoto
  • Patent number: 10460768
    Abstract: A base member includes a recessed portion extending in radial directions and recessed upward from a lower surface of the base member, and a hole extending through the recessed portion in the vertical direction. The recessed portion includes a recessed portion loop-shaped surface defining a loop-shaped surface in the radial direction. A connector is located on a lower side of the recessed portion to cover the hole portion. An adhesive is located between the connector and the recessed portion.
    Type: Grant
    Filed: August 17, 2018
    Date of Patent: October 29, 2019
    Assignees: NIDEC CORPORATION, WEST DIGITAL TECHNOLOGIES, INC.
    Inventors: Masahiro Akagi, Takeshi Ohiro, Tomohiro Yoneda, Akihiro Yudate, Takayuki Ishino, Sho Nakamura, Jiro Kaneko, Takako Hayakawa, Kimihiko Sudo, Yuta Onobu
  • Publication number: 20190287573
    Abstract: A base unit includes a support to support a motor, a bottom plate, and a wall. The bottom plate extends radially outward from the support. The wall extends upward from an outer periphery of the bottom plate, and includes a rectangular opening in planar view. Surfaces of the bottom plate and the wall include a cover surface covered with an electrodeposition coating film and an exposed surface in which a material of the base unit is exposed from the electrodeposition coating film. At least an upper end surface of the wall and a partial region of an inside wall surface of the wall continuous with the upper end surface are each the exposed surface.
    Type: Application
    Filed: March 7, 2019
    Publication date: September 19, 2019
    Inventors: Tomonori TERASAKI, Tomohiro YONEDA, Junzo FUJINAWA, Hirokazu WATANABE, Tadahiro KURAMOTO
  • Patent number: 10407775
    Abstract: A base plate is arranged to define a portion of a housing of a hard disk drive, and includes a base body defined by casting, and an electrodeposition coating film arranged to cover a surface of the base body. The surface of the base body includes a coated surface covered with the electrodeposition coating film, and a flat worked surface exposed from the electrodeposition coating film. The worked surface may include a gate position to which a gate has been connected at the time of the casting. At least a portion of the worked surface is covered with an impregnant.
    Type: Grant
    Filed: January 25, 2018
    Date of Patent: September 10, 2019
    Assignee: NIDEC CORPORATION
    Inventors: Kunio Sakurada, Tomohiro Yoneda
  • Patent number: 10347301
    Abstract: A base member includes a recessed portion extending in radial directions and recessed upward from a lower surface of the base member and a hole extending through the recessed portion in the vertical direction. The recessed portion includes a recessed portion loop-shaped surface defining a loop-shaped surface in the radial direction. A connector is located on a lower side of the recessed portion to cover the hole portion. An adhesive is located between the connector and the recessed portion.
    Type: Grant
    Filed: August 17, 2018
    Date of Patent: July 9, 2019
    Assignee: NIDEC CORPORATION
    Inventors: Masahiro Akagi, Takeshi Ohiro, Tomohiro Yoneda, Akihiro Yudate, Takayuki Ishino, Sho Nakamura
  • Publication number: 20190139579
    Abstract: A base member is structured to define a portion of a casing in which a gas with a density lower than that of air is to be sealed and to support a motor to be housed in the casing. The base member includes a base body made of a cast material, an information mark, and an insulating coating layer. The information mark includes casting information and is located on a portion of a surface of the base body. The insulating coating layer is defined on the surface of the base body and covers the information mark.
    Type: Application
    Filed: October 1, 2018
    Publication date: May 9, 2019
    Inventors: Tomohiro YONEDA, Takaharu FUNATSU, Akitsugu MIWA, Masakazu MATSUYAMA, Junzo FUJINAWA, Tadahiro KURAMOTO
  • Publication number: 20190093234
    Abstract: A base plate is arranged to define a portion of a housing of a hard disk drive, and includes a base body defined by casting, and an electrodeposition coating film arranged to cover a surface of the base body. The surface of the base body includes a coated surface covered with the electrodeposition coating film, and a flat worked surface exposed from the electrodeposition coating film. The worked surface may include a gate position to which a gate has been connected at the time of the casting. At least a portion of the worked surface is covered with an impregnant.
    Type: Application
    Filed: January 25, 2018
    Publication date: March 28, 2019
    Inventors: Kunio Sakurada, Tomohiro Yoneda
  • Publication number: 20190013049
    Abstract: A base member includes a recessed portion extending in radial directions and recessed upward from a lower surface of the base member, and a hole extending through the recessed portion in the vertical direction. The recessed portion includes a recessed portion loop-shaped surface defining a loop-shaped surface in the radial direction. A connector is located on a lower side of the recessed portion to cover the hole portion. An adhesive is located between the connector and the recessed portion.
    Type: Application
    Filed: August 17, 2018
    Publication date: January 10, 2019
    Inventors: Masahiro AKAGI, Takeshi OHIRO, Tomohiro YONEDA, Akihiro YUDATE, Takayuki ISHINO, Sho NAKAMURA
  • Publication number: 20180374514
    Abstract: A base member includes a recessed portion extending in radial directions and recessed upward from a lower surface of the base member and a hole extending through the recessed portion in the vertical direction. The recessed portion includes a recessed portion loop-shaped surface defining a loop-shaped surface in the radial direction. A connector is located on a lower side of the recessed portion to cover the hole portion. An adhesive is located between the connector and the recessed portion.
    Type: Application
    Filed: August 17, 2018
    Publication date: December 27, 2018
    Inventors: Masahiro AKAGI, Takeshi OHIRO, Tomohiro YONEDA, Akihiro YUDATE, Takayuki ISHINO, Sho NAKAMURA
  • Patent number: 10120011
    Abstract: A test unit according to the present invention includes: a first contact probe contacting with an electrode provided on a front surface of one of contact targets, and contacting with an electrode of the other contact target; a second contact probe contacting with an electrode provided on a back surface of the one of contact targets and contacting with an electrode of a substrate; a first probe holder including a suction holder that sucks and holds the one of contact targets, and accommodating and holding therein the first contact probes; a second probe holder accommodating and holding therein the second contact probes; and a base portion, which is layered over the first probe holder and holds the other contact target at a side thereof layered over the first probe holder; and a gap is formed between the other contact target and the first probe holder.
    Type: Grant
    Filed: February 12, 2015
    Date of Patent: November 6, 2018
    Assignee: NHK Spring Co., Ltd.
    Inventors: Kohei Hironaka, Takashi Nidaira, Tomohiro Yoneda
  • Patent number: 10102876
    Abstract: In a spindle motor, a cup portion of a base member includes a cylindrical portion coaxial or substantially coaxial with a central axis extending in a vertical direction and a bottom plate portion defined integrally with the cylindrical portion, and located to close a lower portion of the cylindrical portion. The bearing mechanism is inside of the cup portion and an outer circumferential surface of the bearing mechanism and an inner circumferential surface of the cylindrical portion include a first adhesive layer located therebetween. The base member includes a communicating hole that passes through the bottom plate portion in an axial direction. The communicating hole includes a second adhesive layer located therein.
    Type: Grant
    Filed: December 1, 2017
    Date of Patent: October 16, 2018
    Assignee: NIDEC CORPORATION
    Inventors: Tomohiro Yoneda, Takeshi Ohiro, Takayuki Ishino
  • Patent number: 10068607
    Abstract: A base portion of a motor includes an inner bottom plate portion, a recessed portion and groove portions recessed upward from a lower surface of the inner bottom plate portion, and at least one through hole passing through the inner bottom plate portion in an axial direction. The groove portions extend from the recessed portion toward land portions of a circuit board on a lower surface of the base portion. Conducting wires are drawn out from coils above the base portion to a draw-out surface through the at least one through hole, and are passed through communicating openings and the groove portions to be soldered to the land portions. Each of the at least one through hole is covered with the sealant. Drawing the conducting wires out of the recessed portion through the groove portions prevents the sealant in the recessed portion from overflowing toward the land portions.
    Type: Grant
    Filed: November 6, 2015
    Date of Patent: September 4, 2018
    Assignee: NIDEC CORPORATION
    Inventors: Masahiro Akagi, Tomohiro Yoneda, Tadahiro Kuramoto, Hiroshi Kobayashi, Masayuki Maeda, Daisuke Moro
  • Patent number: 10068622
    Abstract: A base member includes a recessed portion arranged to extend in radial directions and recessed upward from a lower surface of the base member, the radial directions being directions perpendicular to a vertical direction; and a hole portion arranged to pass through the recessed portion in the vertical direction. The recessed portion includes a recessed portion loop-shaped surface being a loop-shaped surface perpendicular to the vertical direction. A connector is arranged on a lower side of the recessed portion to cover the hole portion. An adhesive is arranged between the connector and the recessed portion.
    Type: Grant
    Filed: October 13, 2017
    Date of Patent: September 4, 2018
    Assignee: NIDEC CORPORATION
    Inventors: Masahiro Akagi, Takeshi Ohiro, Tomohiro Yoneda, Akihiro Yudate, Takayuki Ishino, Sho Nakamura
  • Patent number: 9935528
    Abstract: A base portion of a spindle motor includes a base portion through hole passing therethrough from an upper surface to a lower surface thereof. Coils include a lead wire drawn out from above the upper surface downwardly from the lower surface through the base portion through hole. A circuit board includes a land portion to which the lead wire is connected. The spindle motor includes an insulation sheet portion configured to cover at least a portion of the base portion through hole and with which the lead wire is arranged to be in contact. A thickness of the insulation sheet portion is greater than a thickness of the land portion.
    Type: Grant
    Filed: May 21, 2015
    Date of Patent: April 3, 2018
    Assignee: NIDEC CORPORATION
    Inventors: Tomohiro Yoneda, Hiroshi Kobayashi, Masanobu Taki
  • Publication number: 20180090166
    Abstract: In a spindle motor, a cup portion of a base member includes a cylindrical portion coaxial or substantially coaxial with a central axis extending in a vertical direction and a bottom plate portion defined integrally with the cylindrical portion, and located to close a lower portion of the cylindrical portion. The bearing mechanism is inside of the cup portion and an outer circumferential surface of the bearing mechanism and an inner circumferential surface of the cylindrical portion include a first adhesive layer located therebetween. The base member includes a communicating hole that passes through the bottom plate portion in an axial direction. The communicating hole includes a second adhesive layer located therein.
    Type: Application
    Filed: December 1, 2017
    Publication date: March 29, 2018
    Inventors: Tomohiro YONEDA, Takeshi OHIRO, Takayuki ISHINO
  • Patent number: 9911456
    Abstract: A cup portion of a base member includes a cylindrical portion and a bottom plate portion. The cylindrical portion is arranged to be coaxial or substantially coaxial with a central axis extending in a vertical direction. The bottom plate portion is defined integrally with the cylindrical portion, and is arranged to close a lower portion of the cylindrical portion. A bearing mechanism is arranged inside of the cup portion. An outer circumferential surface of the bearing mechanism and an inner circumferential surface of the cylindrical portion have an adhesive layer arranged therebetween. In one preferred embodiment of the present invention, a communicating hole passing through the cylindrical portion in a direction that crosses an axial direction is defined in the vicinity of a junction of the cylindrical portion and the bottom plate portion. In another preferred embodiment of the present invention, the base member includes a communicating hole passing through the bottom plate portion in the axial direction.
    Type: Grant
    Filed: February 22, 2017
    Date of Patent: March 6, 2018
    Assignee: NIDEC CORPORATION
    Inventors: Tomohiro Yoneda, Takeshi Ohiro, Takayuki Ishino
  • Publication number: 20180053534
    Abstract: A base member includes a recessed portion arranged to extend in radial directions and recessed upward from a lower surface of the base member, the radial directions being directions perpendicular to a vertical direction; and a hole portion arranged to pass through the recessed portion in the vertical direction. The recessed portion includes a recessed portion loop-shaped surface being a loop-shaped surface perpendicular to the vertical direction. A connector is arranged on a lower side of the recessed portion to cover the hole portion. An adhesive is arranged between the connector and the recessed portion.
    Type: Application
    Filed: October 13, 2017
    Publication date: February 22, 2018
    Inventors: Masahiro AKAGI, Takeshi OHIRO, Tomohiro YONEDA, Akihiro YUDATE, Takayuki ISHINO, Sho NAKAMURA
  • Patent number: 9886984
    Abstract: A base member includes a recessed portion arranged to extend in radial directions and recessed upward from a lower surface of the base member, the radial directions being directions perpendicular to a vertical direction or directions parallel to these directions; and a hole portion arranged to pass through the recessed portion in the vertical direction. The recessed portion includes a recessed portion loop-shaped surface being a loop-shaped surface perpendicular to the vertical direction. A connector is arranged on a lower side of the recessed portion to cover the hole portion. An adhesive is arranged between the connector and the recessed portion.
    Type: Grant
    Filed: December 13, 2016
    Date of Patent: February 6, 2018
    Assignee: NIDEC CORPORATION
    Inventors: Masahiro Akagi, Takeshi Ohiro, Tomohiro Yoneda, Akihiro Yudate, Takayuki Ishino, Sho Nakamura
  • Patent number: 9822787
    Abstract: A dynamic pressure bearing apparatus includes a bearing portion, a shaft, a radial dynamic pressure bearing portion, and a seal gap. An annular member arranged in an annular shape, fixed to the shaft axially between the seal portion and the attachment surface, and arranged to extend radially outward beyond an opening of the seal gap. A minute horizontal gap extending radially is defined between an upper surface of the bearing portion and a lower surface of the annular member. The seal gap is arranged to be in communication with an exterior space through the horizontal gap.
    Type: Grant
    Filed: February 24, 2016
    Date of Patent: November 21, 2017
    Assignee: NIDEC CORPORATION
    Inventors: Tomotsugu Sugiyama, Teiichi Hirono, Shinichiro Noda, Akihiro Kimura, Yoshiharu Ikegami, Tomohiro Hasegawa, Masafumi Fujimoto, Tomohiro Yoneda