Patents Assigned to Mitsumi Electric Co., Ltd.
  • Patent number: 10788660
    Abstract: An optical scanning device includes an optical scanner including a mirror that includes a light reflection surface, a driving source that causes the mirror to rotate around a rotation axis passing through the center of the light reflection surface in response to a driving signal, and a piezoelectric sensor that outputs a sensor signal corresponding to a rotational angle of the mirror around the rotation axis; and an impedance conversion circuit that receives the sensor signal from the piezoelectric sensor, performs impedance conversion on the received sensor signal, and outputs the impedance-converted sensor signal.
    Type: Grant
    Filed: August 29, 2018
    Date of Patent: September 29, 2020
    Assignee: MITSUMI ELECTRIC CO., LTD.
    Inventors: Yoichi Sakaue, Takahiko Nishiyama
  • Publication number: 20200296337
    Abstract: A control device for a laser scanning display apparatus includes a laser device, a current source that generates an electric current supplied to the laser device, and a controller that controls the current source to set a current value of the electric current supplied to the laser device. During a period for scanning a non-display area where no image is displayed, the controller sets the current value at a first drive current value that is less than a threshold current value at which the laser device starts oscillating; and during a period for scanning a portion with a luminance level of zero in a display area where an image is displayed, the controller sets the current value at a second drive current value that is greater than or equal to the first drive current value and less than the threshold current value.
    Type: Application
    Filed: March 4, 2020
    Publication date: September 17, 2020
    Applicant: MITSUMI ELECTRIC CO., LTD.
    Inventors: Toyoki TANAKA, Etsuji HAYAKAWA
  • Patent number: 10775639
    Abstract: A lens driving device including: a fixing part disposed in such a manner that the fixing part is separated from the movable part in the direction of the optical axis; and suspension wires that extend along the direction of the optical axis and support the movable part with respect to the fixing part in such a manner that the movable part is displaceable in the direction orthogonal to the direction of the optical axis, a first end of each suspension wire being fixed to the fixing part, a second end of each suspension wire being fixed to the movable part, in which the fixing part includes a base member and a wire connecting member, the wire connecting member including a main body part and a wire connecting part exposed from the base member, the first end of each suspension wire being fixed to the wire connecting part.
    Type: Grant
    Filed: July 31, 2018
    Date of Patent: September 15, 2020
    Assignee: MITSUMI ELECTRIC CO., LTD.
    Inventors: Yukihiro Takimoto, Keiichi Sato, Ichiro Hayashi
  • Publication number: 20200284620
    Abstract: An optical module includes a fixed substrate, and a sensor substrate secured to the fixed substrate and having a through-hole formed therein. A light emitting device is secured to the fixed substrate at a position in the through-hole. A light receiving device is provided in the sensor substrate. A dummy light receiving device is formed between the light receiving device and the through-hole, around the through-hole, and in the sensor substrate. The light receiving device and the dummy light receiving device are made of an impurity diffusion layer having a same conductive type as a conductive type of a surface layer of the sensor substrate. The dummy light receiving device is deeper than the light receiving device.
    Type: Application
    Filed: March 3, 2020
    Publication date: September 10, 2020
    Applicant: MITSUMI ELECTRIC CO., LTD.
    Inventors: Tomomitsu OHARA, Kazuki TSUTSUMI, Shinji KIMURA, Syuhei SUZUKI, Yusuke OHBA
  • Patent number: 10770796
    Abstract: An antenna device mounted to an automobile includes an antenna component and an amplifier board provided with an amplifier to amplify signals received by the antenna component. The antenna component includes a metal plate and a resonance point adjusting coil having a first end connected to the metal plate, the resonance point adjusting coil being connected to an input terminal of the amplifier board at the first end via the metal plate. The impedance of the antenna component is adjustable by the mount angle of the resonance point adjusting coil to the antenna component.
    Type: Grant
    Filed: September 24, 2018
    Date of Patent: September 8, 2020
    Assignee: MITSUMI ELECTRIC CO., LTD.
    Inventor: Ryutaro Miura
  • Publication number: 20200280264
    Abstract: Disclosed is a switching power supply device including: a transformer for voltage conversion; a main switching element connected in series to a primary coil; a primary side control circuit that performs on/off control of the main switching element; a synchronous rectification MOS transistor connected in series to a secondary coil; and a secondary side control circuit that performs on/off control of the MOS transistor, wherein the secondary side control circuit includes: an off-timing detection circuit that compares a drain voltage of the MOS transistor with a predetermined threshold voltage, and detects a timing to turn off the MOS transistor; and a threshold voltage setting circuit that sets the threshold voltage, and the threshold voltage setting circuit sets the threshold voltage based on a conduction period of the secondary coil or a period obtained by adding the conduction period to a conduction period of the primary coil.
    Type: Application
    Filed: February 19, 2020
    Publication date: September 3, 2020
    Applicant: MITSUMI ELECTRIC CO., LTD.
    Inventors: Minoru KADO, Takumi HYUGAJI, Takeshi SATO
  • Publication number: 20200271731
    Abstract: An electronic device includes a deformation amount detecting unit configured to detect a deformation amount of a secondary battery connected to the electronic device; a total charge/discharge amount detecting unit configured to detect a total charge/discharge amount of the secondary battery; a storage unit configured to store reference data representing a relationship between the deformation amount and the total charge/discharge amount; a state determining unit configured to determine a state of the secondary battery, based on the deformation amount detected by the deformation amount detecting unit, the total charge/discharge amount detected by the total charge/discharge amount detecting unit, and the reference data; and a notification control unit configured to perform a notification based on a result of the state of the secondary battery.
    Type: Application
    Filed: February 5, 2020
    Publication date: August 27, 2020
    Applicant: MITSUMI ELECTRIC CO., LTD.
    Inventor: Takayuki SUGAYA
  • Publication number: 20200271921
    Abstract: A light scanning apparatus includes a light source configured to output laser light, and a mirror configured to reflect the laser light from the light source. The light scanning apparatus includes a mirror driving unit configured to resonantly drive the mirror in a first direction and non-resonantly drive the mirror in a second direction, the second direction being perpendicular to the first direction. The light scanning apparatus includes a first sensor configured to output a signal in accordance with a first deflection angle at which the mirror is oriented with respect to the first direction. The light scanning apparatus includes a second sensor configured to output a signal in accordance with a second deflection angle at which the mirror is oriented with respect to the second direction.
    Type: Application
    Filed: February 5, 2020
    Publication date: August 27, 2020
    Applicant: MITSUMI ELECTRIC CO., LTD.
    Inventor: Yuji KIMURA
  • Patent number: 10746957
    Abstract: A lens driving device according to the present invention is a lens driving device that includes an auto-focus coil and an auto-focus magnet and that moves a movable auto-focus unit including the auto-focus coil in the direction of an optical axis relative to a fixed auto-focus unit including the auto-focus magnet by using a driving force of a voice coil motor constituted of the auto-focus coil and the auto-focus magnet. The fixed auto-focus unit includes a case formed of a non-magnetic material and having a rectangular shape in plan view and a base on which the case is fixed. The auto-focus magnet has the shape of a flat plate disposed on a side face of the case, and at least one of the four side faces of the case is a non-magnet-disposed face, on which the auto-focus magnet is not disposed.
    Type: Grant
    Filed: April 5, 2016
    Date of Patent: August 18, 2020
    Assignee: MITSUMI ELECTRIC CO., LTD.
    Inventors: Tomohiko Osaka, Norikazu Kudo
  • Patent number: 10750062
    Abstract: Provided are a lens driving device, a camera module, and a camera-mounted device for which the miniaturization and weight reduction can be achieved and the reliability can also be improved. The lens driving device includes auto-focusing and shake-correcting driving parts utilizing a voice coil motor. An autofocus fixing part includes a Hall element configured to detect a position of an autofocus movable part in the optical-axis direction, and the autofocus movable part includes a position-detecting magnet arranged near the Hall element. Both of an auto-focusing magnet part and the position-detecting magnet are radially magnetized.
    Type: Grant
    Filed: June 19, 2018
    Date of Patent: August 18, 2020
    Assignee: MITSUMI ELECTRIC CO., LTD.
    Inventors: Tomohiko Osaka, Takashi Ishizawa
  • Patent number: 10749358
    Abstract: A rechargeable battery protection integrated circuit that protects a rechargeable battery, by turning off a switching circuit inserted in series in a current path between a negative electrode of the rechargeable battery and a negative terminal that is coupled to ground of a load or a charger, includes a power source terminal that electrically connects to a positive electrode of the rechargeable battery, a ground terminal that electrically connects to the negative electrode of the rechargeable battery, a monitor terminal that electrically connects to the negative terminal via a resistor, to monitor a potential of the negative terminal, and a clamp circuit. The clamp circuit monitors a voltage of the power source terminal and a voltage of the monitor terminal, and limits the voltage of the monitor terminal to a voltage lower than or equal to the voltage of the power source terminal.
    Type: Grant
    Filed: September 21, 2018
    Date of Patent: August 18, 2020
    Assignee: MITSUMI ELECTRIC CO., LTD.
    Inventor: Kohei Shibata
  • Publication number: 20200260011
    Abstract: Provided are a lens driving device, a camera module and a camera-mounted device which can perform translational deviation correction in addition to angular deviation correction. The lens driving device is provided with: an image-capturing unit which captures a subject image formed by a lens unit; a driving unit for translational deviation correction which performs translational deviation correction by shaking the lens unit within a plane perpendicular to an optical axis, on the basis of a detection signal from a translational deviation detecting unit that detects a translational deviation; and a driving unit for angular deviation correction which performs angular deviation correction by integrally tilting the image-capturing unit and the driving unit for translational deviation correction, on the basis of a detection signal from an angular deviation detecting unit that detects an angular deviation.
    Type: Application
    Filed: November 14, 2016
    Publication date: August 13, 2020
    Applicant: MITSUMI ELECTRIC CO., LTD.
    Inventors: Shun SASAKI, Toshiyuki TAKAHASHI, Satoshi AJIKI
  • Patent number: 10739176
    Abstract: A disclosed flow rate sensor has a heat element and a plurality of temperature detectors, and in a state in which the heat element generates heat, a flow rate of a fluid flowing on the temperature detectors is detected, based on temperature detection results of each of the temperature detectors. The flow rate sensor includes a semiconductor substrate having a frame shape with an opening, a diaphragm part provided on the semiconductor substrate, and the heat element and the plurality of temperature detectors provided on the diaphragm part. The diaphragm part has a thin film structure part that covers the opening, and in a plan view, the plurality of temperature detectors are arranged in a periphery of the heat element.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: August 11, 2020
    Assignee: MITSUMI ELECTRIC CO., LTD.
    Inventors: Yoshihiro Haseko, Yota Yamamoto
  • Publication number: 20200251824
    Abstract: An antenna device includes an antenna unit that receives radio waves of a plurality of first frequency bands and outputs received signals, and a first band pass filter that transmits, out of the received signals that are output, received signals of at least two second frequency bands out of the first frequency bands.
    Type: Application
    Filed: January 28, 2020
    Publication date: August 6, 2020
    Applicant: MITSUMI ELECTRIC CO., LTD.
    Inventors: Daiki MONMA, Kozo SHIMIZU, Takahiro OSHIMA, Kazunari SAITO
  • Publication number: 20200239297
    Abstract: The present invention is to provide an optical scanner module. An optical scanner apparatus scans laser light by oscillating a mirror with a piezoelectric element. A package that mounts the optical scanner apparatus and electrically is connected to a substrate via a connector. A package cover that is fixed to the package and seals the optical scanner apparatus so that the optical scanner apparatus is not visually recognized from an outside. The package and the package cover are bonded by a heat curing adhesive agent. A vent for releasing gas in a space where the optical scanner apparatus is sealed is formed in the package cover, and the vent is blocked by ultraviolet curing resin.
    Type: Application
    Filed: April 15, 2020
    Publication date: July 30, 2020
    Applicant: MITSUMI ELECTRIC CO., LTD.
    Inventors: Tsukasa YAMADA, Takahiro WAKASUGI, Shinobu KASAHARA
  • Publication number: 20200241314
    Abstract: A lens drive device comprises: a fixing part disposed away from the movable part; a cover for covering the movable part in the direction of an optical axis; and suspension wires for supporting the movable part relative to the fixing part, one ends of the suspension wires being secured to the fixing part and the other ends being secured to the movable part. The movable part is configured so as to be provided with: a damper material disposed so as to come in contact with the suspension wires; a stopper protrusion provided near a portion of the light-receiving-side surface where the other ends of the suspension wires are secured, the tip end of the stopper protrusion facing the inner surface of the cover in the direction of the optical axis; and a flow-stopper part stopping a flow of the damper flowing.
    Type: Application
    Filed: July 30, 2018
    Publication date: July 30, 2020
    Applicant: MITSUMI ELECTRIC CO., LTD.
    Inventors: Yukihiro TAKIMOTO, Keiichi SATO, Ichiro HAYASHI
  • Patent number: 10725313
    Abstract: The lens driving device is provided with a driving unit for OIS, using a driving force of a first voice coil motor to enable an OIS movable unit to swing in a plane orthogonal to the optical axis direction with respect to an OIS fixed unit; a driving unit for AF, using the driving force of a second voice coil motor to enable an AF movable unit to move along the optical axis direction with respect to an AF fixed unit; a supporting unit for OIS, formed of a first elastomeric material, and having a first biaxial hinge structure moveably supporting the OIS movable unit in the plane orthogonal to the optical axis direction; and a supporting unit for AF, formed of a second elastomeric material, and having a second biaxial hinge structure moveably supporting the AF movable unit along the optical axis direction.
    Type: Grant
    Filed: November 20, 2015
    Date of Patent: July 28, 2020
    Assignee: MITSUMI ELECTRIC CO., LTD.
    Inventor: Masayoshi Sugawara
  • Patent number: 10725109
    Abstract: A battery monitoring circuit for a portable device driven by a secondary battery that supplies an electric current via a wiring pattern formed on a substrate. The battery monitoring circuit includes: a current measuring circuit that measures a current value of a current that flows in the wiring pattern by monitoring an amount of voltage drop that occurs in a specific section of the wiring pattern; a converter that converts the current value into a digital measured current value; a first storage part that stores data for compensating a variation in a resistance value of the wiring pattern depending on an individual particularity of the substrate; and a calculating part configured to correct the digital measured current value by using the data to calculate a corrected current value and to calculate a remaining capacity or to monitor a state of the secondary battery based on the corrected current value.
    Type: Grant
    Filed: October 30, 2017
    Date of Patent: July 28, 2020
    Assignee: MITSUMI ELECTRIC CO., LTD.
    Inventors: Hitoshi Hagimori, Yasuhiro Kinoshita
  • Patent number: 10720847
    Abstract: A semiconductor device for a switching power supply includes first and second external terminals, ON and OFF timing generation circuits, and a drive pulse generation circuit. To the first and second external terminals, a feedback voltage and a voltage induced in an auxiliary winding are input, respectively. The ON and OFF timing generation circuits respectively generate timing signals turning on and off a switching element based on the voltages. The drive pulse generation circuit generates a pulse signal based on these signals. The ON timing generation circuit includes: a bottom detection circuit detecting a lowest point of the voltage of the second external terminal; and a timer circuit, and operates in a PWM mode and a quasi-resonant mode in response to a timing of an output of the timer circuit being before a timing of an output of the bottom detection circuit and the reverse case, respectively.
    Type: Grant
    Filed: October 2, 2019
    Date of Patent: July 21, 2020
    Assignee: MITSUMI ELECTRIC CO., LTD.
    Inventors: Hiroki Matsuda, Satoshi Arima, Yukio Murata
  • Patent number: 10721406
    Abstract: A lens drive apparatus has: a magnet and a coil configured to displace the lens holder in a direction of an optical axis and a direction orthogonal to the optical axis in collaboration with each other. The coil includes first and second coils. The magnet includes first and second magnets. The first coil is disposed on an outer periphery of the lens holder. The first magnet, the second magnet, the second coil and a Hall device are each disposed to be spaced from the outer periphery of the lens holder at respective positions different from each other in the direction of the optical axis. Inner surfaces of the magnets at a side of the lens holder and outer surfaces of the magnets at an opposite side of the inner surfaces have reverse polarities, the inner surfaces have reverse polarities, and the outer surfaces have reverse polarities.
    Type: Grant
    Filed: April 24, 2019
    Date of Patent: July 21, 2020
    Assignee: MITSUMI ELECTRIC CO., LTD.
    Inventors: Akihiro Moriya, Masayoshi Sugawara