Patents by Inventor Kazuhiko Fukushima
Kazuhiko Fukushima 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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Patent number: 11926492Abstract: A linear transport apparatus includes a transport cart, a first roller that rotates about a first rotation shaft extending from the transport cart along a first direction, a second roller that rotates about a second rotation shaft extending from the transport cart and forming an acute angle with the first rotation shaft, and a rail sandwiched between the first and second rollers to extend along a track on which the transport cart moves. The rail includes a first contact portion coming contact with the first roller and restricting movement of the transport cart in a second direction perpendicular to a direction in which the rail extends and the first direction, and a second contact portion that comes into contact with the second roller and is parallel to the second rotation shaft, and the rail includes a portion in which curvature of the track moves is different from another portion.Type: GrantFiled: June 17, 2021Date of Patent: March 12, 2024Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Takuma Nakamura, Shin Sakai, Masaoki Iwase, Kazuhiko Fukushima
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Patent number: 11831216Abstract: A linear motor system includes: a mover including permanent magnets arranged in a traveling direction in a plane parallel to a plane formed by the traveling direction and a vertical direction; and a stator including an armature including an iron core in which projections around which windings are wound are arranged in the traveling direction, the armature being disposed to face the permanent magnets of the mover. The mover includes a mover body including a first main roller engaged with a first traveling surface disposed on the stator, a placing table on which a conveyance object is placed, and a sub-roller engaged with a second traveling surface disposed on an upper surface of the stator. The first main roller supports a magnetic attraction force generated between the stator and the mover, and the sub-roller supports a force in a direction opposite the magnetic attraction force acting on the mover.Type: GrantFiled: August 27, 2019Date of Patent: November 28, 2023Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Fumihiko Nakagome, Masaoki Iwase, Kazuhiko Fukushima, Hiroshi Wakayama, Takahiko Murakami
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Publication number: 20230322275Abstract: A linear transport apparatus includes a transport cart, a first roller that rotates about a first rotation shaft extending from the transport cart along a first direction, a second roller that rotates about a second rotation shaft extending from the transport cart and forming an acute angle with the first rotation shaft, and a rail sandwiched between the first and second rollers to extend along a track on which the transport cart moves. The rail includes a first contact portion coming contact with the first roller and restricting movement of the transport cart in a second direction perpendicular to a direction in which the rail extends and the first direction, and a second contact portion that comes into contact with the second roller and is parallel to the second rotation shaft, and the rail includes a portion in which curvature of the track moves is different from another portion.Type: ApplicationFiled: June 17, 2021Publication date: October 12, 2023Applicant: Mitsubishi Electric CorporationInventors: Takuma NAKAMURA, Shin SAKAI, Masaoki IWASE, Kazuhiko FUKUSHIMA
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Patent number: 11766774Abstract: There is provided a planar member having a flat portion that makes contact with the inner circumferential surface of an endless track at a position at a traveling subject side with respect to a virtual straight line that connects a vertex, at the traveling subject side, in the outer circumferential surface of a first pulley and a vertex, at the traveling subject side, in the outer circumferential surface of a second pulley.Type: GrantFiled: January 23, 2017Date of Patent: September 26, 2023Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Daisuke Mizuno, Yoshihiro Morimoto, Kazuhiko Fukushima, Naoya Kadota, Kazuyuki Tsumagari
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Patent number: 11682933Abstract: A motor includes a rotor rotatable about a center axis that extends vertically, a stator opposing the rotor in a radial direction, and a base portion opposing a lower surface of the stator in an axial direction. The base portion includes a lower lid portion extending in a direction orthogonal or substantially orthogonal to the center axis, a protruding portion protruding in the axial direction from an upper surface at a center of the lower lid portion, and a stator holding portion adjacent to the protruding portion in the axial direction and contactable with an inner circumferential surface of the stator. The protruding portion includes a first ventilation portion opening downward at the center of the lower lid portion and a second ventilation portion to cause the protruding portion to communicate with the first ventilation portion.Type: GrantFiled: October 31, 2019Date of Patent: June 20, 2023Assignee: NIDEC CORPORATIONInventor: Kazuhiko Fukushima
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Publication number: 20220416637Abstract: A linear motor system includes: a mover including permanent magnets arranged in a traveling direction in a plane parallel to a plane formed by the traveling direction and a vertical direction; and a stator including an armature including an iron core in which projections around which windings are wound are arranged in the traveling direction, the armature being disposed to face the permanent magnets of the mover. The mover includes a mover body including a first main roller engaged with a first traveling surface disposed on the stator, a placing table on which a conveyance object is placed, and a sub-roller engaged with a second traveling surface disposed on an upper surface of the stator. The first main roller supports a magnetic attraction force generated between the stator and the mover, and the sub-roller supports a force in a direction opposite the magnetic attraction force acting on the mover.Type: ApplicationFiled: August 27, 2019Publication date: December 29, 2022Applicant: Mitsubishi Electric CorporationInventors: Fumihiko NAKAGOME, Masaoki IWASE, Kazuhiko FUKUSHIMA, Hiroshi WAKAYAMA, Takahiko MURAKAMI
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Publication number: 20220374206Abstract: A semiconductor device and a method of verifying random number data capable of preventing erroneous judgement of data having periodicity as a random number and verifying randomness of random number data with high accuracy are provided. The semiconductor device includes a random number generator for generating random number data as serial data, and a health test circuit for verifying randomness of the random number data. The health test circuit handles the random number data as a data string of n-bit data by dividing the random number data by n bits (n is an integer larger than or equal to two). and verifies randomness based on the n-bit data.Type: ApplicationFiled: April 18, 2022Publication date: November 24, 2022Inventors: Kazuhiko FUKUSHIMA, Kazuo ASAMI
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Patent number: 11353377Abstract: In a wedge looseness diagnosis which is performed by striking wedges of a rotary electric machine, a variation of a wave form of a strike sound is reduced with respect to a variation of an amount of looseness of the wedges, and it is difficult that a slight difference of the amount of the looseness of the wedges is discriminated, so that the wedges are struck by a strike portion in a state where the wedges are pressed by a pressure portion which presses the wedges, and a strike sound at a high frequency is reduced, whereby an amount of a variation of magnitude of the strike sound is enlarged with respect to a valuation of the amount of the looseness of the wedges, and the amount of the looseness of the wedges is judged in accordance with the strike sound which is obtained by a strike sound measuring portion.Type: GrantFiled: January 23, 2017Date of Patent: June 7, 2022Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Yoshihiro Morimoto, Daisuke Mizuno, Kazuhiko Fukushima, Kohei Nakamura, Wataru Nagaya
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Patent number: 11136988Abstract: A gas dynamic bearing includes a shaft extending along a central axis extending vertically, and a sleeve with a hole opening at least at one end of the sleeve in an axial direction, at least a portion of the shaft housed inside the hole. The sleeve includes dynamic pressure grooves in an inner peripheral surface of the hole. The shaft includes a core portion, and a protective portion that is disposed on an outer peripheral surface of the core portion and that includes at least a portion facing the inner peripheral surface of the hole in a radial direction. The protective portion includes a first protective portion and a second protective portion. The first protective portion is at least above or below the second protective portion in the axial direction, and includes at least a portion with a thickness in the radial direction more than a thickness of the second protective portion in the radial direction.Type: GrantFiled: February 11, 2020Date of Patent: October 5, 2021Assignee: NIDEC CORPORATIONInventors: Kazuhiko Fukushima, Takehito Tamaoka
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Patent number: 11021272Abstract: A control moment gyroscope includes: an inner gimbal; a rotor that is held by the inner gimbal to be rotatable around a spin axis; a spin motor that is disposed on the inner gimbal, and that rotates the rotor around the spin axis; a stator that holds the inner gimbal to be rotatable around a gimbal axis that is perpendicular to the spin axis; gimbal bearings that are disposed between the inner gimbal and the stator to face each other from opposite sides of a plane that is perpendicular to the gimbal axis and that includes the spin axis, to be in contact with the plane in question, or to include the plane in question; and a torque module that is disposed on the stator, and that rotates the inner gimbal around the gimbal axis.Type: GrantFiled: July 25, 2016Date of Patent: June 1, 2021Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Munetaka Kashiwa, Kazuhiko Fukushima
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Patent number: 10962018Abstract: A gas dynamic pressure bearing includes a shaft centered on a central axis extending in an up-down direction, and a sleeve that faces at least a portion of the shaft in a radial direction. The portion in which the sleeve and the shaft face each other in the radial direction includes a first dynamic pressure portion at each of both ends in the axial direction, and a second dynamic pressure portion between the first dynamic pressure portions. In the first dynamic pressure portion, one of the sleeve and the shaft includes dynamic pressure grooves arranged in a circumferential direction. A sum of center angles of groove widths of the dynamic pressure grooves in a cross-section cut along a plane orthogonal to the central axis is about 144° or more and about 216° or less.Type: GrantFiled: February 11, 2020Date of Patent: March 30, 2021Assignee: NIDEC CORPORATIONInventors: Kazuhiko Fukushima, Takehito Tamaoka
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Patent number: 10962017Abstract: A centrifugal fan includes a motor, a support body, a rotating body, and a housing. The motor includes a rotor hub that rotates around a central axis extending up and down. The support body is fixed to the rotor hub and rotates together with the rotor hub. The rotating body is different from the support body in material. The rotating body is a continuous porous body. The housing accommodates the rotating body, the support body, and the motor. The housing includes an air inlet open in an axial direction and at least one air outlet open in a radial direction. A radially inner surface of the rotating body opposes a radially outer surface of the rotor hub with a gap interposed therebetween.Type: GrantFiled: February 5, 2019Date of Patent: March 30, 2021Assignee: NIDEC CORPORATIONInventors: Tomoyuki Tsukamoto, Kazuhiko Fukushima
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Patent number: 10836003Abstract: Provided is an insertion guide that performs accurate rotation correction between a shaft and a hole and phase correction between the shaft and hole. The shaft includes: a first guide portion at a distal end of the shaft having a diameter smaller than a diameter of the hole; a second guide portion, provided on a base end side of a first narrow cylindrical portion, and having a diameter smaller than the diameter of the hole and larger than a diameter of the first narrow cylindrical portion; and a third guide portion, provided at the distal end of the shaft, and is a recessed portion to be engaged with a protruding portion formed in the hole. The shaft being inclined with respect to the hole, is brought into contact with the hole at two points or less before the third guide portion is brought into contact with the protruding portion.Type: GrantFiled: December 19, 2016Date of Patent: November 17, 2020Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Masaki Haruna, Kazuhiko Fukushima, Ieyoung Kim, Satoru Sofuku, Toshitaka Nakaoji, Yasushi Horiuchi, Yusuke Saruta, Junji Takaki, Noboru Kawaguchi, Yutaka Ezaki
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Publication number: 20200309139Abstract: A gas dynamic pressure bearing includes a shaft centered on a central axis extending in an up-down direction, and a sleeve that faces at least a portion of the shaft in a radial direction. The portion in which the sleeve and the shaft face each other in the radial direction includes a first dynamic pressure portion at each of both ends in the axial direction, and a second dynamic pressure portion between the first dynamic pressure portions. In the first dynamic pressure portion, one of the sleeve and the shaft includes dynamic pressure grooves arranged in a circumferential direction. A sum of center angles of groove widths of the dynamic pressure grooves in a cross-section cut along a plane orthogonal to the central axis is about 144° or more and about 216° or less.Type: ApplicationFiled: February 11, 2020Publication date: October 1, 2020Inventors: Kazuhiko FUKUSHIMA, Takehito TAMAOKA
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Publication number: 20200309191Abstract: A rotating-side magnet has a tubular shape extending in an axial direction and has different magnetic poles in the axial direction. A fixed-side magnet has a tubular shape extending in the axial direction, opposes the rotating-side magnet with a gap in the radial direction, and has magnetic poles radially different from the magnetic poles of the rotating-side magnet. Fixed-side auxiliary members each of which is made of a ferromagnetic material are provided at both axial ends of the fixed-side magnet.Type: ApplicationFiled: February 11, 2020Publication date: October 1, 2020Inventors: Kazuhiko FUKUSHIMA, Takehito TAMAOKA
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Publication number: 20200309140Abstract: A gas dynamic bearing includes a shaft extending along a central axis extending vertically, and a sleeve with a hole opening at least at one end of the sleeve in an axial direction, at least a portion of the shaft housed inside the hole. The sleeve includes dynamic pressure grooves in an inner peripheral surface of the hole. The shaft includes a core portion, and a protective portion that is disposed on an outer peripheral surface of the core portion and that includes at least a portion facing the inner peripheral surface of the hole in a radial direction. The protective portion includes a first protective portion and a second protective portion. The first protective portion is at least above or below the second protective portion in the axial direction, and includes at least a portion with a thickness in the radial direction more than a thickness of the second protective portion in the radial direction.Type: ApplicationFiled: February 11, 2020Publication date: October 1, 2020Inventors: Kazuhiko FUKUSHIMA, Takehito TAMAOKA
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Patent number: 10744651Abstract: A mirror replacement device includes a gripping mechanism to grip a segment mirror, a fine drive mechanism to change a position and a posture of the gripping mechanism, a lift mechanism for the segment mirror, a first detector to detect a relative position and a relative posture between a comparison object and a target object, a second detector to detect a bend of the fine drive mechanism, and a mirror replacement controller to replace the segment mirror based on detection signals output from the above-mentioned detectors. The controller determines whether the first detector can successfully perform a measurement. When it is determined that the measurement can be successfully performed, the control is performed based on the detection signal output from the first detector. When it is determined that the measurement cannot be successfully performed, the control is performed based on the detection signal output from the second detector.Type: GrantFiled: February 15, 2016Date of Patent: August 18, 2020Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Masaki Haruna, Kazuhiko Fukushima, Ieyoung Kim, Satoru Sofuku, Toshitaka Nakaoji, Yasushi Horiuchi, Yusuke Saruta, Junji Takaki, Noboru Kawaguchi, Yutaka Ezaki
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Publication number: 20200177035Abstract: A motor includes a rotor rotatable about a center axis that extends vertically, a stator opposing the rotor in a radial direction, and a base portion opposing a lower surface of the stator in an axial direction. The base portion includes a lower lid portion extending in a direction orthogonal or substantially orthogonal to the center axis, a protruding portion protruding in the axial direction from an upper surface at a center of the lower lid portion, and a stator holding portion adjacent to the protruding portion in the axial direction and contactable with an inner circumferential surface of the stator. The protruding portion includes a first ventilation portion opening downward at the center of the lower lid portion and a second ventilation portion to cause the protruding portion to communicate with the first ventilation portion.Type: ApplicationFiled: October 31, 2019Publication date: June 4, 2020Inventor: Kazuhiko FUKUSHIMA
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Patent number: 10605782Abstract: A wedge tapping device for a rotating electrical machine to be inserted through a gap between a rotor and a stator to tap a wedge. The wedge tapping device includes: a tapping portion configured to tap the wedge and having a tapping force measuring portion configured to measure a tapping force of the tapping; an energy supplying portion configured to apply tapping energy to the tapping portion; an absorbing portion configured to suppress energy to be applied to the tapping portion; and a tapping arm, on which the tapping portion is disposed, and which has a longitudinal direction in a direction perpendicular to a direction in which the tapping portion performs tapping. The tapping arm is disposed so that the longitudinal direction is parallel to a rotation axis when the tapping is performed in the gap.Type: GrantFiled: January 23, 2017Date of Patent: March 31, 2020Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Yoshihiro Morimoto, Daisuke Mizuno, Kazuhiko Fukushima, Kohei Nakamura
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Patent number: 10559998Abstract: A motor includes a stationary unit and a rotary unit. The stationary unit includes a stator, a base portion having at least one hole extending in the up-down direction, and a flexible wiring substrate. The flexible wiring substrate reaches a position higher than a lower surface of the base portion through at least one hole and is arranged to supply electric power to the stator. The flexible wiring substrate includes a connection portion arranged higher than the lower surface of the base portion and connected to the stator. The connection portion includes a solder portion arranged on a lower surface thereof to cover a portion of a lead wire extending from a coil of the stator. At least a portion of the solder portion is positioned within the hole.Type: GrantFiled: October 13, 2017Date of Patent: February 11, 2020Assignee: NIDEC CORPORATIONInventors: Yoichi Sekii, Takehito Tamaoka, Kazuhiro Sato, Kazuhiko Fukushima, Hiroyuki Abe