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).
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Publication number: 20180053534Abstract: 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: ApplicationFiled: October 13, 2017Publication date: February 22, 2018Inventors: Masahiro AKAGI, Takeshi OHIRO, Tomohiro YONEDA, Akihiro YUDATE, Takayuki ISHINO, Sho NAKAMURA
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Patent number: 9886984Abstract: 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: GrantFiled: December 13, 2016Date of Patent: February 6, 2018Assignee: NIDEC CORPORATIONInventors: Masahiro Akagi, Takeshi Ohiro, Tomohiro Yoneda, Akihiro Yudate, Takayuki Ishino, Sho Nakamura
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Patent number: 9822787Abstract: 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: GrantFiled: February 24, 2016Date of Patent: November 21, 2017Assignee: NIDEC CORPORATIONInventors: Tomotsugu Sugiyama, Teiichi Hirono, Shinichiro Noda, Akihiro Kimura, Yoshiharu Ikegami, Tomohiro Hasegawa, Masafumi Fujimoto, Tomohiro Yoneda
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Patent number: 9812163Abstract: A motor includes a bearing mechanism including a shaft disposed along a center axis extending in a lengthwise direction, a sealing member disposed on a lower side of the bearing mechanism, a stationary portion including a base constituting a part of the housing, and a rotary portion rotating relative to the stationary portion about the center axis via the bearing mechanism. The base has a through hole defined therein so as to have a center aligned with the center axis and pass through the base in an axial direction. The bearing mechanism is fixed to the base in a first fixing region defined between an inner circumferential portion of the base and an outer circumferential portion of the bearing mechanism. The sealing member is fixed to the base in a second fixing region defined between the inner circumferential portion of the base and an outer circumferential portion of the sealing member. At least one of the first fixing region and the second fixing region includes a sealing region.Type: GrantFiled: June 8, 2016Date of Patent: November 7, 2017Assignee: NIDEC CORPORATIONInventors: Tomohiro Yoneda, Hiroshi Kobayashi, Masanobu Taki
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Publication number: 20170249968Abstract: 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: ApplicationFiled: February 22, 2017Publication date: August 31, 2017Inventors: Tomohiro YONEDA, Takeshi OHIRO, Takayuki ISHINO
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Patent number: 9742239Abstract: A base portion made of a metal includes an upper surface, a lower surface, and a base portion through hole. An insulation sheet portion is located on the lower surface, and covers at least a portion of the base portion through hole. A lead wire is in contact with the insulation sheet portion. A spindle motor includes a first sealant located in the base portion through hole, and a second sealant which covers at least a portion of the base portion through hole. The first sealant has a coefficient of linear expansion greater than a coefficient of linear expansion of the base portion and smaller than a coefficient of linear expansion of the second sealant.Type: GrantFiled: May 21, 2015Date of Patent: August 22, 2017Assignee: NIDEC CORPORATIONInventors: Tomohiro Yoneda, Hiroshi Kobayashi, Masanobu Taki
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Publication number: 20170186467Abstract: 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: ApplicationFiled: December 13, 2016Publication date: June 29, 2017Inventors: Masahiro AKAGI, Takeshi OHIRO, Tomohiro YONEDA, Akihiro YUDATE, Takayuki ISHINO, Sho NAKAMURA
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Publication number: 20170025146Abstract: A motor includes a bearing mechanism including a shaft disposed along a center axis extending in a lengthwise direction, a sealing member disposed on a lower side of the bearing mechanism, a stationary portion including a base constituting a part of the housing, and a rotary portion rotating relative to the stationary portion about the center axis via the bearing mechanism. The base has a through hole defined therein so as to have a center aligned with the center axis and pass through the base in an axial direction. The bearing mechanism is fixed to the base in a first fixing region defined between an inner circumferential portion of the base and an outer circumferential portion of the bearing mechanism. The sealing member is fixed to the base in a second fixing region defined between the inner circumferential portion of the base and an outer circumferential portion of the sealing member. At least one of the first fixing region and the second fixing region includes a sealing region.Type: ApplicationFiled: June 8, 2016Publication date: January 26, 2017Inventors: Tomohiro YONEDA, Hiroshi KOBAYASHI, Masanobu TAKI
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Publication number: 20170010315Abstract: 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: ApplicationFiled: February 12, 2015Publication date: January 12, 2017Inventors: Kohei HIRONAKA, Takashi NIDAIRA, Tomohiro YONEDA
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Publication number: 20160254022Abstract: A base portion of a motor includes an annular 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 are arranged to extend from the recessed portion toward land portions of a circuit board arranged on a lower surface of the base portion. A draw-out surface of the recessed portion has a lower opening of each of the at least one through hole defined therein. A wall surface of the recessed portion includes communicating openings each of which is in communication with one end of a separate one of the groove portions. Conducting wires are drawn out from coils arranged above the base portion to the draw-out surface through the at least one through hole, and are passed through the communicating openings and the groove portions to be soldered to the land portions. The recessed portion has a sealant arranged therein.Type: ApplicationFiled: November 6, 2015Publication date: September 1, 2016Inventors: Masahiro AKAGI, Tomohiro YONEDA, Tadahiro KURAMOTO, Hiroshi KOBAYASHI, Masayuki MAEDA, Daisuke MORO
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Publication number: 20160169242Abstract: 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: ApplicationFiled: February 24, 2016Publication date: June 16, 2016Applicant: NIDEC CORPORATIONInventors: Tomotsugu Sugiyama, Teiichi Hirono, Shinichiro Noda, Akihiro Kimura, Yoshiharu Ikegami, Tomohiro Hasegawa, Masafumi Fujimoto, Tomohiro Yoneda
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Publication number: 20160164365Abstract: A base portion made of a metal includes an upper surface, a lower surface, and a base portion through hole. An insulation sheet portion is located on the lower surface, and covers at least a portion of the base portion through hole. A lead wire is in contact with the insulation sheet portion. A spindle motor includes a first sealant located in the base portion through hole, and a second sealant which covers at least a portion of the base portion through hole. The first sealant has a coefficient of linear expansion greater than a coefficient of linear expansion of the base portion and smaller than a coefficient of linear expansion of the second sealant.Type: ApplicationFiled: May 21, 2015Publication date: June 9, 2016Inventors: Tomohiro YONEDA, Hiroshi KOBAYASHI, Masanobu TAKI
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Publication number: 20160164364Abstract: 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: ApplicationFiled: May 21, 2015Publication date: June 9, 2016Inventors: Tomohiro YONEDA, Hiroshi KOBAYASHI, Masanobu TAKI
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Patent number: 9341189Abstract: A fan includes a motor and an impeller. The motor includes a stationary portion and a rotating portion rotatably supported by the stationary portion. The stationary portion includes a stator and a bearing portion arranged inside of the stator. The rotating portion includes a rotor magnet arranged radially outside the stator; a shaft inserted in the bearing portion, and having an upper portion fixed to the impeller directly or through one or more members; and a thrust portion arranged axially opposite the bearing portion, and including an annular surface arranged around the shaft.Type: GrantFiled: June 14, 2012Date of Patent: May 17, 2016Assignee: NIDEC CORPORATIONInventors: Teiichi Hirono, Shinichiro Noda, Yoshiharu Ikegami, Tomohiro Hasegawa, Tomohiro Yoneda, Shunji Matsumoto, Seungsin Yoo, Kouta Kabune
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Patent number: 9303653Abstract: A dynamic pressure bearing apparatus includes a bearing portion; a shaft; a substantially annular bushing; a radial dynamic pressure bearing portion; and a seal gap. A minute horizontal gap extending radially is defined between an upper surface of the bearing portion and a lower surface of the bushing. The seal gap is arranged to be in communication with an exterior space through the horizontal gap.Type: GrantFiled: October 14, 2014Date of Patent: April 5, 2016Assignee: NIDEC CORPORATIONInventors: Tomotsugu Sugiyama, Teiichi Hirono, Shinichiro Noda, Akihiro Kimura, Yoshiharu Ikegami, Tomohiro Hasegawa, Masafumi Fujimoto, Tomohiro Yoneda
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Patent number: 9190880Abstract: A spindle motor includes a base portion and a bearing mechanism. A fixing region, which includes a first region at which the base portion and the bearing mechanism are fixed to each other and a second region at which a seal gap is defined between the base portion and the bearing mechanism, is located between an inner circumferential portion of the base portion which defines a through hole and an outer circumferential portion of the bearing mechanism. The inner circumferential portion of the base portion has, at least in the second region, a degree of surface roughness greater than a degree of surface roughness of the outer circumferential portion of the bearing mechanism. The seal gap gradually decreases in radial width with increasing height, and includes an adhesive along an entire circumference of the seal gap.Type: GrantFiled: April 20, 2015Date of Patent: November 17, 2015Assignee: Nidec CorporationInventors: Takatoki Sugi, Tomohiro Yoneda, Hiroshi Kobayashi, Masanobu Taki
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Publication number: 20150228300Abstract: A spindle motor includes a base portion and a bearing mechanism. A fixing region, which includes a first region at which the base portion and the bearing mechanism are fixed to each other and a second region at which a seal gap is defined between the base portion and the bearing mechanism, is located between an inner circumferential portion of the base portion which defines a through hole and an outer circumferential portion of the bearing mechanism. The inner circumferential portion of the base portion has, at least in the second region, a degree of surface roughness greater than a degree of surface roughness of the outer circumferential portion of the bearing mechanism. The seal gap gradually decreases in radial width with increasing height, and includes an adhesive along an entire circumference of the seal gap.Type: ApplicationFiled: April 20, 2015Publication date: August 13, 2015Inventors: Takatoki SUGI, Tomohiro YONEDA, Hiroshi KOBAYASHI, Masanobu TAKI
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Publication number: 20150179212Abstract: A spindle motor includes a shaft extending in an axial direction, and a base portion configured to define a portion of a housing, and including a through hole in which the shaft is inserted. The shaft includes a non-through hole portion, a first connection channel, and a second connection channel extending from the non-through hole portion in a radial direction. An upper portion of the hole portion includes a screw hole portion including a screw thread. A minimum diameter of the screw thread is greater than an inside diameter of the hole portion. A sealing member is located between the screw hole portion and the first connection channel.Type: ApplicationFiled: March 2, 2015Publication date: June 25, 2015Inventors: Takatoki SUGI, Tomohiro YONEDA, Hiroshi KOBAYASHI, Takumi SHIMOMURA
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Patent number: 9058833Abstract: A spindle motor includes a shaft extending in an axial direction, and a base portion configured to define a portion of a housing, and including a through hole in which the shaft is inserted. The shaft includes a non-through hole portion, a first connection channel, and a second connection channel extending from the non-through hole portion in a radial direction. An upper portion of the hole portion includes a screw hole portion including a screw thread. A minimum diameter of the screw thread is greater than an inside diameter of the hole portion. A sealing member is located between the screw hole portion and the first connection channel.Type: GrantFiled: March 2, 2015Date of Patent: June 16, 2015Assignee: Nidec CorporationInventors: Takatoki Sugi, Tomohiro Yoneda, Hiroshi Kobayashi, Takumi Shimomura
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Patent number: 9051938Abstract: A fan includes a motor and an impeller. The motor includes a stationary portion and a rotating portion rotatably supported by the stationary portion. The stationary portion includes a stator and a bearing portion arranged inside of the stator. The rotating portion includes a rotor magnet arranged radially outside the stator; a shaft inserted in the bearing portion, and having an upper portion fixed to the impeller directly or through one or more members; and a thrust portion arranged axially opposite the bearing portion, and including an annular surface arranged around the shaft.Type: GrantFiled: July 2, 2012Date of Patent: June 9, 2015Assignee: NIDEC CORPORATIONInventors: Teiichi Hirono, Shinichiro Noda, Yoshiharu Ikegami, Tomohiro Hasegawa, Tomohiro Yoneda, Shunji Matsumoto, Seungsin Yoo, Kouta Kabune, Kiyoto Ida, Naoki Matsuba, Tatsuya Akase, Takehito Tamaoka, Kazuhiko Fukushima