Patents by Inventor Akitoshi Mizutani

Akitoshi Mizutani 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: 10115889
    Abstract: A method for manufacturing semiconductor devices is provided. The method includes bonding a semiconductor element to a first surface of a planar lead frame, clamping a partial area of the lead frame to hold the lead frame and the semiconductor element in molding dies, and covering at least a part of the lead frame and the semiconductor element with a resin member by resin molding which fills the molding dies with resin. A thin-walled portion having a relative small thickness is previously formed on a shortest virtual line connecting a clamp area of the lead frame to an area where the semiconductor element is bonded.
    Type: Grant
    Filed: May 24, 2017
    Date of Patent: October 30, 2018
    Assignees: DENSO CORPORATION, TDK-MICRONAS GMBH
    Inventors: Toshiyuki Koumori, Yoshiyuki Kono, Tomoyuki Takiguchi, Yoshinori Inuzuka, Akitoshi Mizutani, Seiji Nishimoto, Camillo Pilla
  • Publication number: 20180245953
    Abstract: A magnetic field detection device includes an IC package, a terminal, a resin mold member. The IC package includes a magnetism detection element, a lead frame located on a first side of the magnetism detection element, and a resin member covering the magnetism detection element and the lead frame. The resin mold member includes a base portion and a head portion. The head portion includes a thickest portion. An outer wall surface of the thickest portion located on a second side of the magnetism detection element is a detection reference surface. An element corresponding surface that is an outer wall surface of the IC package located on the second side is exposed to an outside of resin mold member or covered with a detection side thin portion thinner than a thickness from the element corresponding surface to the detection side reference surface.
    Type: Application
    Filed: August 8, 2016
    Publication date: August 30, 2018
    Inventors: Seiji NISHIMOTO, Tomoyuki TAKIGUCHI, Yoshiyuki KONO, Akitoshi MIZUTANI
  • Publication number: 20170345998
    Abstract: A method for manufacturing semiconductor devices is provided. The method includes bonding a semiconductor element to a first surface of a planar lead frame, clamping a partial area of the lead frame to hold the lead frame and the semiconductor element in molding dies, and covering at least a part of the lead frame and the semiconductor element with a resin member by resin molding which fills the molding dies with resin. A thin-walled portion having a relative small thickness is previously formed on a shortest virtual line connecting a clamp area of the lead frame to an area where the semiconductor element is bonded.
    Type: Application
    Filed: May 24, 2017
    Publication date: November 30, 2017
    Inventors: Toshiyuki KOUMORI, Yoshiyuki KONO, Tomoyuki TAKIGUCHI, Yoshinori INUZUKA, Akitoshi MIZUTANI, Seiji NISHIMOTO, Camillo PILLA
  • Publication number: 20170292856
    Abstract: The present disclosure provides a rotational angle detecting device. An IC substrate has a flat surface extending along a rotational axis of a throttle valve. Yokes forms, together with the magnets, a closed magnetic circuit. A first Hall element outputs a first signal according to the magnetic flux density in a first direction along the flat surface. A second Hall element outputs a second signal according to the magnetic flux density in a second direction intersecting the flat surface. The first and second Hall elements are positioned within a region that is surrounded by the magnets and the yoke and that is between an edge surface and an edge surface.
    Type: Application
    Filed: February 24, 2017
    Publication date: October 12, 2017
    Applicant: DENSO CORPORATION
    Inventors: Tomoyuki TAKIGUCHI, Yoshiyuki KONO, Akitoshi MIZUTANI
  • Patent number: 9709422
    Abstract: A rotation angle and stroke amount detection device includes a sensor unit, a rotation angle calculation unit, and a stroke amount calculation unit. The sensor unit includes sin and cos sensors which are magnetic sensing elements that detect changes in a magnetic field caused by rotation or linear displacement of a detection target. The sensor unit outputs sin and cos signals based on detection values of the sin and cos sensors. The rotation angle calculation unit calculates a rotation angle of the detection target based on the sin and cos signals output by the sensor unit. The stroke amount calculation unit calculates a stroke amount of the detection target based on the same signals as those used by the rotation angle calculation unit, i.e., the sin and cos signals. Accordingly, the configuration of the sensor unit may be simplified and the physical size of the device may be reduced.
    Type: Grant
    Filed: October 30, 2015
    Date of Patent: July 18, 2017
    Assignee: DENSO CORPORATION
    Inventors: Seiji Nishimoto, Akitoshi Mizutani
  • Patent number: 9677912
    Abstract: A rotation angle detection device includes: a magnetic field generation portion that generates a magnetic field; and a first magnetism detection element and a second magnetism detection element disposed to have an angle of 90° therebetween in a rotation direction of the detection target and to rotate relative to the magnetism generation portion. The first magnetism detection element outputs a first output signal, and the second magnetism detection element outputs a second output signal. An amplitude shift correction circuit matches amplitudes of the first output signal and the second output signal which differ in phase by 90° from each other. A rotation angle computation circuit connected to the amplitude shift correction circuit computes and outputs a rotation angle of a detection target based on the first output signal and the second output signal having matched amplitudes.
    Type: Grant
    Filed: February 4, 2016
    Date of Patent: June 13, 2017
    Assignee: DENSO CORPORATION
    Inventor: Akitoshi Mizutani
  • Patent number: 9605977
    Abstract: A first opposing surface of a first yoke has a constant radius of curvature and has a center of curvature that lies on a center of rotation. At least two rotation direction end portions of a second opposing surface of the second yoke are formed such that toward either end in the rotation direction, the two end portions are increasingly spaced away from a reference curved surface in a direction away from the first opposing surface. The first and second opposing surfaces face each other to define a gap thereinbetween. Accordingly, the gap between the yokes is wider at its end portions than at its center, and increases in magnetic flux density flowing through a Hall element is curtailed at the end portions of the gap. Further, it is not necessary for the first yoke to protrude outward when widening the end portions of the gap.
    Type: Grant
    Filed: October 26, 2015
    Date of Patent: March 28, 2017
    Assignee: DENSO CORPORATION
    Inventors: Hitomi Honda, Akitoshi Mizutani, Yoshiyuki Kono
  • Patent number: 9488461
    Abstract: A rotation angle detection device includes a magnetic field generation section, a yoke, and a magnetism detection section. The magnetic field generation section has a first end portion and a second end portion. The yoke has such a tube shape that the magnetic field generation section and a rotation axis of a rotating body are located therein. The yoke has a gap at a part in a circumferential direction in a cross section perpendicular to the rotation axis. The magnetism detection section is disposed in the gap and outputs an electrical signal in accordance with a magnetic field strength in the gap. The magnetic field generation section is disposed in such a manner that a magnetic force line passing through the magnetic field generation section passes through the rotation axis regardless of the rotation angle of the rotating body and the rotation axis passes through the first end portion.
    Type: Grant
    Filed: May 29, 2013
    Date of Patent: November 8, 2016
    Assignee: DENSO CORPORATION
    Inventors: Hitomi Honda, Akitoshi Mizutani, Yoshiyuki Kono
  • Patent number: 9470554
    Abstract: A position detector includes a Hall element that detects a magnetic flux density and a temperature detection element that detects the temperature of the Hall element. In a rotation angle calculation process, a temperature correction value a is calculated by substituting a detection temperature t of the temperature detection element and a reference maximum voltage V0 at a reference temperature t0 for a=V0×k (t?t0). Next, a correction maximum voltage Vt is calculated by substituting the temperature correction value a for a temperature characteristic formula of Vt=V0+a. Further, a rotation angle ? of a magnet relative to the Hall element is calculated by substituting an output voltage VH of the Hall element and the correction maximum voltage Vt for ?=sin?1 (VH/Vt). Since the correction maximum voltage Vt is corrected according to the temperature, the rotation angle is accurately detected.
    Type: Grant
    Filed: July 29, 2013
    Date of Patent: October 18, 2016
    Assignee: DENSO CORPORATION
    Inventors: Takamitsu Kubota, Akitoshi Mizutani, Yoshiyuki Kono
  • Publication number: 20160231139
    Abstract: A rotation angle detection device includes: a magnetic field generation portion that generates a magnetic field; and a first magnetism detection element and a second magnetism detection element disposed to have an angle of 90° therebetween in a rotation direction of the detection target and to rotate relative to the magnetism generation portion. The first magnetism detection element outputs a first output signal, and the second magnetism detection element outputs a second output signal. An amplitude shift correction circuit matches amplitudes of the first output signal and the second output signal which differ in phase by 90° from each other. A rotation angle computation circuit connected to the amplitude shift correction circuit computes and outputs a rotation angle of a detection target based on the first output signal and the second output signal having matched amplitudes.
    Type: Application
    Filed: February 4, 2016
    Publication date: August 11, 2016
    Inventor: Akitoshi MIZUTANI
  • Publication number: 20160123767
    Abstract: A first opposing surface of a first yoke has a constant radius of curvature and has a center of curvature that lies on a center of rotation. At least two rotation direction end portions of a second opposing surface of the second yoke are formed such that toward either end in the rotation direction, the two end portions are increasingly spaced away from a reference curved surface in a direction away from the first opposing surface. The first and second opposing surfaces face each other to define a gap thereinbetween. Accordingly, the gap between the yokes is wider at its end portions than at its center, and increases in magnetic flux density flowing through a Hall element is curtailed at the end portions of the gap. Further, it is not necessary for the first yoke to protrude outward when widening the end portions of the gap.
    Type: Application
    Filed: October 26, 2015
    Publication date: May 5, 2016
    Inventors: Hitomi HONDA, Akitoshi MIZUTANI, Yoshiyuki KONO
  • Publication number: 20160123769
    Abstract: A rotation angle and stroke amount detection device includes a sensor unit, a rotation angle calculation unit, and a stroke amount calculation unit. The sensor unit includes sin and cos sensors which are magnetic sensing elements that detect changes in a magnetic field caused by rotation or linear displacement of a detection target. The sensor unit outputs sin and cos signals based on detection values of the sin and cos sensors. The rotation angle calculation unit calculates a rotation angle of the detection target based on the sin and cos signals output by the sensor unit. The stroke amount calculation unit calculates a stroke amount of the detection target based on the same signals as those used by the rotation angle calculation unit, i.e., the sin and cos signals. Accordingly, the configuration of the sensor unit may be simplified and the physical size of the device may be reduced.
    Type: Application
    Filed: October 30, 2015
    Publication date: May 5, 2016
    Inventors: Seiji NISHIMOTO, Akitoshi MIZUTANI
  • Patent number: 9322888
    Abstract: A position detection apparatus includes a magnetic generator, a magnetic detector, a storage, and a rotation angle calculator. The rotation angle calculator calculates a relative rotation angle of the magnetic generator with respect to the magnetic detector based on a voltage output from the magnetic detector and a relational expression of ?=sin?1((VH?c)/V0)?b. In the relational expression, the relative rotation angle is defined as ?, the voltage output from the magnetic detector is defined as VH, a true maximum value of the voltage output from the magnetic detector is defined as V0, a first true correction value is defined as b, and a second true correction value is defined as c.
    Type: Grant
    Filed: July 3, 2013
    Date of Patent: April 26, 2016
    Assignee: DENSO CORPORATION
    Inventors: Takamitsu Kubota, Akitoshi Mizutani, Yoshiyuki Kono
  • Patent number: 9267817
    Abstract: A rotation angle detection device has a first yoke, an inside surface of which is formed of a first concave curved surface and a second concave curved surface, and a second yoke, an inside surface of which is formed of a third concave curved surface and a fourth concave curved surface. Each concave curved surface does not extend in a second direction but extends toward a first flat surface or a second flat surface in an inclined manner. The first flat surface and the second flat surface face each other sandwiching a Hall element therebetween and are parallel to each other. The magnetic flux, which leaks from the first yoke into an inside space and reaches the second yoke, flows in the second direction over a wider area around the Hall element.
    Type: Grant
    Filed: August 14, 2013
    Date of Patent: February 23, 2016
    Assignee: DENSO CORPORATION
    Inventors: Hitomi Honda, Akitoshi Mizutani, Yoshiyuki Kono
  • Patent number: 9163956
    Abstract: In a rotation angle detecting device, a signal from a first magnetism detecting element is outputted to a signal output part of a first IC package. A first signal output terminal outputs the signal from the first magnetism detecting element to outside. A signal from a second magnetism detecting element is outputted to a signal output part of a second IC package. A second signal output terminal outputs the signal from the second magnetism detecting element to outside. At least one of a power supply terminal and a ground terminal is located between the first and second signal output terminals. A rotary drive unit includes the device, a motor that rotates a detection object, and a motor power source wire. The ground terminal and a motor power source terminal are adjacent to each other.
    Type: Grant
    Filed: September 13, 2013
    Date of Patent: October 20, 2015
    Assignee: DENSO CORPORATION
    Inventors: Takehito Mizunuma, Tomoyuki Takiguchi, Akitoshi Mizutani, Yoshiyuki Kono
  • Patent number: 9035645
    Abstract: A first and a second magnet are provided on a movable member so as to oppose to each other across a virtual plane. Each magnet is magnetized in a direction perpendicular to the movable member, so that the same magnetic poles of the magnets are opposed to each other. A hall IC is provided at a position more remote from the movable member than the magnets so as to be movable on the virtual plane relative to the movable member. A Y-parallel area is formed in a space equally distanced from the first and the second magnets, in which magnetic fields of the first and the second magnet rebel against each other, so that directions of the magnetic fields are so made to be in parallel to a stroke direction of the movable member. Robustness for a position gap between the magnets and the hall IC is improved.
    Type: Grant
    Filed: October 30, 2012
    Date of Patent: May 19, 2015
    Assignee: DENSO CORPORATION
    Inventors: Akitoshi Mizutani, Naoaki Kouno
  • Patent number: 8957670
    Abstract: A stroke amount detection device includes a yoke, a magnetic flux generation section, and a magnetism detection section. The yoke has a protruding section that protrudes to outside the yoke. The magnetic flux generation section is located in the yoke. The magnetism detection section is disposed between the magnetic flux generation section and the protruding section. The magnetism detection section is disposed at a fixed position with respect to the magnetic flux generation section. The magnetism detection section outputs a signal in accordance with a magnetic flux density generated due to a relative movement of the yoke with respect to the magnetism detection section.
    Type: Grant
    Filed: April 4, 2013
    Date of Patent: February 17, 2015
    Assignee: Denso Corporation
    Inventors: Akitoshi Mizutani, Hitomi Honda, Yoshiyuki Kono
  • Patent number: 8909486
    Abstract: A flow measuring device includes a flow rate detecting part, an analog/digital conversion part, and a signal processing part. The flow rate detecting part detects a flow rate of air flowing through the passage, and outputs a flow voltage signal, which is a voltage in accordance with the flow rate. The analog/digital conversion part converts the flow voltage signal from the flow rate detecting part into digital data, which is flow digital data. The signal processing part performs calculation processing upon the flow digital data, which includes averaging of a predetermined number of consecutive pieces of the flow digital data, and outputs the averaged flow digital data as a flow rate signal. The predetermined number is equal to or larger than two.
    Type: Grant
    Filed: October 25, 2011
    Date of Patent: December 9, 2014
    Assignee: Denso Corporation
    Inventors: Yasushi Kohno, Takao Ban, Akitoshi Mizutani
  • Patent number: 8901686
    Abstract: A mounting structure for mounting a chip type electric element on a flexible board includes: the flexible board having a first land, on which a first lead terminal of another electric element is soldered; and the chip type electric element having a long side. A whole of the long side of the chip type electric element faces a long side of the first land. A length of the long side of the first land is defined as IA, and a distance between one long side of the first land and one long side of the chip type electric element is defined as IB, the one long side of the first land facing the chip type electric element but opposite to the one long side of the chip type electric element. The length of IA is equal to or larger than the distance of IB.
    Type: Grant
    Filed: November 23, 2011
    Date of Patent: December 2, 2014
    Assignee: Denso Corporation
    Inventors: Satoru Hiramoto, Koichiro Matsumoto, Yoshiyuki Kono, Akitoshi Mizutani
  • Patent number: 8874387
    Abstract: An air flow measurement device measures a flow amount of air. A flow sensor is configured to output a voltage value corresponding to a given flow amount of the air. A temperature sensor is configured to output temperature of the air. A correction coefficient memory portion is configured to store a correction coefficient for correcting the voltage value of the flow sensor to a corrected voltage value associated with the given flow amount based on a predetermined standard temperature. A relationship between the voltage value of the flow sensor and the flow amount of the air changes based on temperature of the air. A correction portion is configured to correct the output voltage value of the flow sensor to the corrected voltage value using the correction coefficient.
    Type: Grant
    Filed: May 28, 2009
    Date of Patent: October 28, 2014
    Assignee: Denso Corporation
    Inventors: Akitoshi Mizutani, Takao Ban