Patents by Inventor Kazumasa Ito
Kazumasa Ito 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: 20210075273Abstract: A stator includes a core back portion, a plurality of teeth extending inward in a radial direction of the stator from the core back portion, a first system coil portion and a second system coil portion wound on each of the teeth, and a magnetic interference reduction member provided between the first system coil portion and the second system coil portion to reduce magnetic interference between the first system coil portion and the second system coil portion. Further, the first system coil portion and the second system coil portion are connected to mutually different power supply sources, that is, the first system coil portion and the second system coil portion are each connected to a first system power supply source or a second system power supply source.Type: ApplicationFiled: March 20, 2019Publication date: March 11, 2021Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Hiroko IKEDA, Shinichi YAMAGUCHI, Yuji TAKIZAWA, Yu HIROTANI, Kazumasa ITO
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Patent number: 10910892Abstract: In the rotary electric machine according to the present invention, a plurality of core sheets include linked core sheets that include linking portions that protrude circumferentially from flange portions so as to link together tip portions of adjacent tooth portions, at least one sheet of the linked core sheets is formed such that a tooth tip portion shape is mirror-asymmetrical relative to a tooth central axis that passes through a circumferential center of the tooth portions, and a stator core is configured by laminating the linked core sheets such that circumferential positions of the linking portions are offset.Type: GrantFiled: April 22, 2015Date of Patent: February 2, 2021Assignee: Mitsubishi Electric CorporationInventors: Yu Hirotani, Kazumasa Ito, Yuji Takizawa, Satoru Akutsu, Hiroshi Aida, Shusuke Hori
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Patent number: 10903724Abstract: The present invention provides a rotation angle detector capable of detecting a rotation angle of a rotor in the same manner as at normal time even when abnormality such as disconnection or a short circuit occurs, and capable of reducing the number of terminals. When one spatial order cycle of the output winding is an electrical angle of 360°, a phase difference between a first output winding and a second output winding and a phase difference between the second output winding and a third output winding are set at an electrical angle ?, and ??180°×n (n is an integer).Type: GrantFiled: December 28, 2015Date of Patent: January 26, 2021Assignee: Mitsubishi Electric CorporationInventors: Hiroko Ikeda, Yusuke Morita, Kazumasa Ito, Yu Hirotani, Kodai Okazaki, Satoru Akutsu, Yuji Takizawa
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Patent number: 10855121Abstract: Provided is a rotary electric machine capable of reducing an amount of leakage magnetic flux passing through connecting portions. A cutout portion is formed in the connecting portion so as to be located on a side closer to a magnetic air gap portion. The connecting portion has a slot portion-side thin connecting portion formed so as to be closer to a slot portion than the cutout portion. A slot projecting portion projecting from the slot portion toward the magnetic air gap portion with respect to the slot portion-side thin connecting portion is formed in a portion of the connecting portion that is shifted in the circumferential direction from a portion of the connecting portion in which the slot portion-side thin connecting portion is formed. The slot projecting portion is arranged on each of circumferential sides of the cutout portion.Type: GrantFiled: December 26, 2016Date of Patent: December 1, 2020Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Yu Hirotani, Kazumasa Ito, Hiroko Ikeda, Kodai Okazaki, Shinichi Yamaguchi
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Publication number: 20200363233Abstract: A redundant resolver is configured of a stator and a rotor that form a pair, wherein the rotor is a rotor with a shaft angle multiplier of Nx having Nx (Nx is a natural number) salient poles, the stator is such that n teeth T1 to Tn, where n is a natural number, are disposed sequentially in a circumferential direction, configuring M systems by being divided into M in the circumferential direction, and having an angle of 360/M degrees when angles of the teeth configuring one system are totaled, a one-phase excitation winding and a two-phase output winding are wound around each of the teeth T1 to Tn, excitation signals of the same frequency are applied by differing excitation circuits to the respective excitation windings, an output order per system is Nout (Nout is a natural number), and an abnormality is detected based on output signals of the M systems.Type: ApplicationFiled: December 21, 2017Publication date: November 19, 2020Applicant: Mitsubishi Electric CorporationInventors: Hiroko IKEDA, Yuji TAKIZAWA, Kazumasa ITO, Shinichi YAMAGUCHI, Toshihiro MATSUNAGA, Yosuke SUGINO
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Patent number: 10835187Abstract: A physiological information display device includes: a display on which a numerical value corresponding to physiological information of a subject is displayed; a memory that stores a program; and a processor that executes the program to change a number of significant digits of the numerical value that is to be displayed on the display. In the device, the numerical value contains a first digit and a second digit, the first digit is always displayed in a first size and in a first area of the display, the number of significant digits is changed depending on whether the second digit is displayed in a second size and in a second area of the display or is not displayed, the second size being smaller than the first size, and a position and size of the first area are not changed even when the second digit is displayed.Type: GrantFiled: June 14, 2019Date of Patent: November 17, 2020Assignee: Nihon Kohden CorporationInventors: Yoshinori Ueda, Kazumasa Ito, Hideki Fujisaki
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Patent number: 10833549Abstract: In the armature winding of a rotary electric machine, in a series coil portion group, the numbers of turns of conducting wire in the coil portions that have an electrical angular phase difference of ?k that satisfies ?1<?k?m are different than the numbers of turns of conducting wire in the ?1 and ?m coil portions, and are also different than the numbers of turns of conducting wire in the coil portions that are adjacent to the ?k coil portions on two sides in a circumferential direction of the stator core, and phases of the ?k coil portions are also different than phases of each of the coil portions that are adjacent to the ?k coil portions on the two sides in the circumferential direction.Type: GrantFiled: February 26, 2016Date of Patent: November 10, 2020Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Kodai Okazaki, Masatsugu Nakano, Kazumasa Ito, Yu Hirotani, Hiroko Ikeda, Koji Kawamura
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Patent number: 10778077Abstract: A synchronous linear motor, including: a stator including projecting poles including magnetic bodies; and a movable element arranged opposed to the projecting poles through a space. The movable element includes a core with a magnetic body, coils, and permanent magnets arrayed along a moving direction. The core includes core backs and teeth projecting from the core backs toward the projecting poles. The coils are at least wound around the teeth on both end sides in the moving direction. The permanent magnets are arranged at center portions of the teeth along a projecting direction of the teeth. A polarity of a magnetic pole of the permanent magnet is the same as a polarity of an opposed magnetic pole in an adjacent permanent magnet. The number of different shapes of the permanent magnets or the number of different magnetic characteristics of the permanent magnets is two or more.Type: GrantFiled: January 26, 2017Date of Patent: September 15, 2020Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Kenta Motoyoshi, Ariff Zaini, Kazumasa Ito, Toshinori Tanaka, Shinichi Yamaguchi
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Patent number: 10734856Abstract: In a rotary electric machine, a conductive member surrounds a shaft and a plurality of permanent magnets provided on an outer peripheral portion of the shaft as a whole, and a holding member surrounds the shaft, the plurality of permanent magnets, and the conductive member as a whole. A conductivity of the conductive member is higher than a conductivity of the permanent magnet. The conductive member includes first and second opposing portions that oppose each other via a gap in a circumferential direction. An inter-opposing portion region existing between the first and second opposing portions is positioned within a circumferential direction range of an inter-magnet region existing between permanent magnets that are adjacent to each other in the circumferential direction.Type: GrantFiled: July 29, 2016Date of Patent: August 4, 2020Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Takahiro Mizuta, Moriyuki Hazeyama, Kazumasa Ito, Shinichi Yamaguchi, Masatsugu Nakano, Yoshiharu Takashima, Yoshiki Okada, Masafumi Ogawa
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Patent number: 10722154Abstract: A medical photometer includes a processor and a memory that stores an instruction readable by a computer. When the instruction is executed by the processor, the medical photometer acquires a first light attenuation of a first light beam that is transmitted through or reflected from a tissue of a living body, and that has a first wavelength, based on a first intensity signal corresponding to an intensity of the first light beam, acquires a second light attenuation of a second light beam that is transmitted through or reflected from the tissue, and that has a second wavelength, based on a second intensity signal corresponding to an intensity of the second light beam, calculates a tissue thickness based on a ratio of the first light attenuation and the second light attenuation, and detects an artifact of the living body based on a temporal variation of the tissue thickness.Type: GrantFiled: October 25, 2017Date of Patent: July 28, 2020Assignee: NIHON KOHDEN CORPORATIONInventors: Yoshinori Ueda, Teiji Ukawa, Kazumasa Ito, Hideki Fujisaki
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Patent number: 10722153Abstract: A medical photometer includes a processor and a memory that stores an instruction readable by a computer. When the instruction is executed by the processor, the medical photometer acquires an intensity of one of a first intensity signal and a second intensity signal, the first intensity signal corresponding to an intensity of a first light beam that has a first wavelength and that is transmitted through or reflected from a tissue of a living body, and a second intensity signal corresponding to an intensity of a second light beam that has a second wavelength and that is transmitted through or reflected from the tissue of the living body acquires an intensity ratio of the first intensity signal and the second intensity signal, and detects an artifact of the living body based on the acquired intensity and the acquired intensity ratio.Type: GrantFiled: October 25, 2017Date of Patent: July 28, 2020Assignee: Nihon Kohden CorporationInventors: Yoshinori Ueda, Teiji Ukawa, Kazumasa Ito, Hideki Fujisaki
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Patent number: 10702196Abstract: A pulse photometer includes a light emitter, a light detector, a first signal separator that separates a first signal component and a first noise component, a second signal separator that separates a second signal component and a second noise component, a first determining section, a second determining section, and a concentration calculating section that calculates a concentration of a light absorption material in blood of the subject based on a fundamental frequency of the first signal component or a fundamental frequency of the second signal component.Type: GrantFiled: November 21, 2017Date of Patent: July 7, 2020Assignee: NIHON KOHDEN CORPORATIONInventors: Yoshinori Ueda, Teiji Ukawa, Kazumasa Ito, Hideki Fujisaki
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Publication number: 20200143970Abstract: To obtain an electromagnetic actuator capable of improving a thrust force of a movable element. Provided is an electromagnetic actuator, including: a stator, which has a first surface at one end in an axial direction and a second surface at another end in the axial direction, and is made of a soft magnetic material having a tubular space formed in the axial direction; and a movable element, which is disposed in the tubular space, and is configured to move along the axial direction, wherein the stator includes: a coil; a core portion; and a protrusion portion, wherein the movable element includes a movable element core made of a soft magnetic material and a permanent magnet, and wherein at least one of a radially inner side and a radially outer side of the permanent magnet is covered by a movable element core.Type: ApplicationFiled: January 2, 2020Publication date: May 7, 2020Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Shoji ISHIKAWA, Toru OGAWA, Kazumasa ITO, Ryuichi TAKIGUCHI
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Patent number: 10627258Abstract: In a related-art resolver, a front and a back of a stator core cannot be distinguished, and it is difficult to mass-produce the resolver while matching directions of shear drops and burrs. Thus, assembly accuracy of the resolver is degraded. Further, productivity and assembling ability are degraded because electromagnetic steel sheets are laminated by rotary lamination. The present invention provides a resolver including: a resolver stator including: a stator core formed of electromagnetic steel sheets, which have teeth, and are laminated without rotary lamination; a one-phase excitation winding; and two-phase output windings; and a resolver rotor arranged to be opposed to the resolver stator, in which the stator core has marks which enable distinction of a rolling direction of the stator core and distinction of a front and a back of the stator core.Type: GrantFiled: August 21, 2014Date of Patent: April 21, 2020Assignee: Mitsubishi Electric CorporationInventors: Yusuke Morita, Atsushi Yamamoto, Masahiko Fujita, Naohiro Motoishi, Kazumasa Ito, Masatsugu Nakano
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Patent number: 10561375Abstract: A pulse photometer includes: a first variation acquirer acquiring a first variation corresponding to a light attenuation variation of a first light beam due to pulsation of blood in a subject based on a first intensity signal corresponding to an intensity of the first light beam transmitted through or reflected from a body of the subject and having a first wavelength; a second variation acquirer acquiring a second variation; a third variation acquirer acquiring a third variation; a concentration calculator calculating a blood light absorber concentration based on the first variation and the second variation; an estimated value calculator calculating an estimated value of the third variation based on the first variation and the second variation; and an evaluator evaluating reliability of a calculated value of the blood light absorber concentration based on the third variation and the estimated value.Type: GrantFiled: August 26, 2016Date of Patent: February 18, 2020Assignee: NIHON KOHDEN CORPORATIONInventors: Yoshinori Ueda, Teiji Ukawa, Kazumasa Ito, Hideki Fujisaki
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Publication number: 20200029913Abstract: A physiological information measurement device includes one or more processor configured to calculate a first time-averaged value of physiological information of a subject based for a first time period and calculate a second time-averaged value of the physiological information for a second time period that is different from the first time period, and a display configured to display a first graph curve indicating a temporal change of the first time-averaged value and a second graph curve indicating a temporal change of the second time-averaged value.Type: ApplicationFiled: July 18, 2019Publication date: January 30, 2020Applicant: NIHON KOHDEN CORPORATIONInventors: Yoshinori UEDA, Kazumasa ITO, Hideki FUJISAKI
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Patent number: 10524704Abstract: A pulse photometer includes: a first variation acquirer acquiring a first variation corresponding to a light attenuation variation of a first light beam due to pulsation of blood in a subject, based on a first intensity signal corresponding to an intensity of the first light beam that is transmitted through or reflected from a body of the subject, and that has a first wavelength; a second variation acquirer acquiring a second variation; and a concentration calculator calculating a blood light absorber concentration, based on the first and second variations, the second variation containing a first offset which is based on an inverse of the light attenuation variation of the first light beam.Type: GrantFiled: March 3, 2016Date of Patent: January 7, 2020Assignee: NIHON KOHDEN CORPORATIONInventors: Yoshinori Ueda, Teiji Ukawa, Kazumasa Ito, Hideki Fujisaki
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Publication number: 20190388038Abstract: A physiological information display device includes: a display on which a numerical value corresponding to physiological information of a subject is displayed; a memory that stores a program; and a processor that executes the program to change a number of significant digits of the numerical value that is to be displayed on the display. In the device, the numerical value contains a first digit and a second digit, the first digit is always displayed in a first size and in a first area of the display, the number of significant digits is changed depending on whether the second digit is displayed in a second size and in a second area of the display or is not displayed, the second size being smaller than the first size, and a position and size of the first area are not changed even when the second digit is displayed.Type: ApplicationFiled: June 14, 2019Publication date: December 26, 2019Applicant: Nihon Kohden CorporationInventors: Yoshinori UEDA, Kazumasa ITO, Hideki FUJISAKI
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Publication number: 20190363663Abstract: In the present electric driving apparatus, coils that constitute a first armature winding and coils that constitute a second armature winding are arranged so as to alternate in a circumferential direction, and a control portion is configured so as to perform single-system driving when one of a first system and a second system fails, the single-system driving stopping driving of an inverter of the system that has failed, and controlling driving of the inverter of the system that has not failed to supply inverter phase currents to an armature winding of the system that has not failed such that the inverter phase currents are set to a second upper limit value that is greater than a first upper limit value.Type: ApplicationFiled: January 26, 2017Publication date: November 28, 2019Applicant: Mitsubishi Electric CorporationInventors: Yu HIROTANI, Kazumasa ITO, Yusuke MORITA, Yuji TAKIZAWA, Satoru AKUTSU, Masafumi OKAZAKI
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Patent number: 10485480Abstract: A probe which is to be attached to a finger of a subject to acquire physiological parameter of the subject includes a light emitter that emits a light beam toward the finger, a light detector that outputs a signal corresponding to a light beam that is transmitted through or reflected from the finger, a first holding face that has a portion which is faced with a nail of the finger and another portion which is faced with a side face of the finger, and a second holding face that has a portion which is faced with a pad of the finger and another portion which is faced with the side face of the finger. In a state where the probe is attached to the finger, the first holding face and the second holding face are placed to be continuous to each other.Type: GrantFiled: July 12, 2016Date of Patent: November 26, 2019Assignee: NIHON KOHDEN CORPORATIONInventors: Yoshinori Ueda, Teiji Ukawa, Kazumasa Ito, Hideki Fujisaki