Patents by Inventor Hiroki Kikuchi

Hiroki Kikuchi 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).

  • Publication number: 20200241336
    Abstract: A complex (10) includes a liquid crystal component (13) and a support (11, 12) of the liquid crystal component (13), in which a lubricating interface derivation region (16) is formed between the liquid crystal component (13) and the support (11, 12). An optical element includes a pair of substrates (11, 12) having electrodes (18, 19) on at least one substrate (11), and a liquid crystal component (13) with which a space between the pair of substrates (11, 12) is filled, in which a lubricating interface derivation region (16) is formed between the pair of substrates (11, 12) and the liquid crystal component (13). It is preferable that the lubricating interface deriving agent (14) is present in the lubricating interface derivation region.
    Type: Application
    Filed: August 26, 2016
    Publication date: July 30, 2020
    Applicants: Kyoto University, KYUSHU UNIVERSITY, NATIONAL UNIVERSITY CORPORATION, Sharp Kabushiki Kaisha, DIC Corporation
    Inventors: Jun Yamamoto, Masumi Yamashita, Waki Sakatsuji, Yoichi Takanishi, Shogo Kato, Hirotsugu Kikuchi, Yasushi Okumura, Hiroki Higuchi, Rijeesh Kizhakidathazhath, Takahito Kanzaki, Yudai Kawashima, Gimpei Machida, Hiroya Nishikawa, Koichi Miyachi, Kiyoshi Minoura, Isa Nishiyama
  • Publication number: 20200169160
    Abstract: A power control device for controlling driving of an LLC resonant converter including a first switching element to one end of which an input voltage is applied, a second switching element of which one end is connected to the other end of the first switching element, and a primary winding and a resonant capacitor connected in series between a first connection node at which the first and second switching elements are connected together and the other end of the second switching element includes an on-timing controller that detects variation of a switching voltage detection signal based on a switching voltage appearing at the first connection node rising up to the input voltage and falling down to 0 V and that, based on the result of the detection, generates a high-side on-signal for turning on the first switching element and a low-side on-signal for turning on the second switching element.
    Type: Application
    Filed: November 5, 2019
    Publication date: May 28, 2020
    Inventors: Hiroki KIKUCHI, Hiroyuki Hatano
  • Patent number: 10651181
    Abstract: The method for producing a pillar-shaped semiconductor device includes a step of forming a tubular SiO2 layer that surrounds side surfaces of a P+ layer 38a and N+ layers 38b and 8c formed on a Si pillar 6b by epitaxial crystal growth, forming an AlO layer 51 on a periphery of the SiO2 layer, forming a tubular contact hole by etching the tubular SiO2 layer using the AlO layer 51 as a mask, and filling the contact hole with W layers 52c, 52d, and 52e to form tubular W layers 52c, 52d, and 52e (including a buffer conductor layer) that have an equal width when viewed in plan and are in contact with side surfaces of the tops of the P+ layer 38a and the N+ layers 38b and 8c.
    Type: Grant
    Filed: April 2, 2019
    Date of Patent: May 12, 2020
    Assignee: UNISANTIS ELECTRONICS SINGAPORE PTE. LTD.
    Inventors: Fujio Masuoka, Nozomu Harada, Hiroki Nakamura, Phillipe Matagne, Yoshiaki Kikuchi
  • Patent number: 10566910
    Abstract: A synchronous rectification controller includes: a drain terminal connected to a drain of a synchronous rectification transistor; a first comparator configured to compare a drain voltage of the drain terminal with a first threshold voltage; a second comparator configured to compare the drain voltage of the drain terminal with a second threshold voltage; a flip-flop to which an ON signal output from the first comparator and an OFF signal output from the second comparator are input; a driver configured to output a gate signal to the synchronous rectification transistor based on an output signal of the flip-flop; and a threshold adjusting part configured to adjust the second threshold voltage based on the drain voltage.
    Type: Grant
    Filed: January 14, 2019
    Date of Patent: February 18, 2020
    Assignee: ROHM CO., LTD.
    Inventor: Hiroki Kikuchi
  • Patent number: 10554038
    Abstract: An isolated synchronous rectification type DC/DC converter, includes: a transformer including primary and secondary windings; a switching transistor connected to the primary winding; a synchronous rectifying transistor installed between the secondary winding and a ground line on the secondary side; a photocoupler including a light emitting device and a light receiving device; a feedback circuit driving the light emitting device such that an output voltage of the DC/DC converter approaches a target voltage; a primary side controller connected to the light receiving device and switching the switching transistor depending on feedback signal from the photocoupler; a synchronous rectification controller controlling the rectifying transistor; and a protection circuit including a temperature detection element, one end of the detection element connected to a drain of the rectifying transistor, the protection circuit configured to detect an overheated state of the rectifying transistor depending on a first signal gene
    Type: Grant
    Filed: June 12, 2017
    Date of Patent: February 4, 2020
    Assignee: ROHM CO., LTD.
    Inventor: Hiroki Kikuchi
  • Patent number: 10483863
    Abstract: A secondary controller drives a light emitting element of a photocoupler such that a detection voltage VOUTS corresponding to an output voltage VOUT generated in an output capacitor C approximates to a reference voltage VREF. A primary controller controls a switching transistor M according to a feedback signal VFB. A protection circuit is activated and drives the light emitting element of the photocoupler when detecting an abnormal state. An auxiliary power supply circuit includes a power supply capacitor C provided separately from the output capacitor C and supplies a power supply voltage VCC to the protection circuit and an anode of the light emitting element of the photocoupler.
    Type: Grant
    Filed: August 10, 2018
    Date of Patent: November 19, 2019
    Assignee: ROHM CO., LTD.
    Inventor: Hiroki Kikuchi
  • Publication number: 20190344879
    Abstract: An aircraft includes an airframe, a hollow member, and a plasma actuator. The hollow member has a body and an internal flow passage. The body extends from front of the airframe to rear of the airframe and has a hollow shape. The internal flow passage extends in the body from the front to the rear. The body has an introduction port configured to introduce a fluid into the internal flow passage, and a blow hole provided more toward the rear than the introduction port, and penetrating the body from an inner circumferential surface of the body to an outer circumferential surface of the body. The plasma actuator is provided at the outer circumferential surface of the body, and disposed on one or more sides, in a circumferential direction of the body, of the blow hole.
    Type: Application
    Filed: April 2, 2019
    Publication date: November 14, 2019
    Inventors: Kohei NAKANO, Takayuki OGURI, Yukinobu TOMONAGA, Akitoshi SAKAGUCHI, Maki KIKUCHI, Hiroki KATO
  • Publication number: 20190329870
    Abstract: A wing structure for an aircraft includes a stationary wing, a flap extendable so as to form an air flow path between the flap and the stationary wing, and at least one plasma actuator. The plasma actuator is configured to induce, while the flap is extended, air flow for suppressing or reducing separation of air on an upper surface of the flap including air flowing from a lower surface of the stationary wing to the upper surface of the flap via the flow path.
    Type: Application
    Filed: April 1, 2019
    Publication date: October 31, 2019
    Applicant: SUBARU CORPORATION
    Inventors: Hiroki KATO, Nobuyuki NAKAZATO, Kentaro YOSHIDA, Maki KIKUCHI, Tomofumi IWAMOTO
  • Publication number: 20190322358
    Abstract: A wing structure a wing structure for an aircraft includes a stationary wing, a movable wing and at least one plasma actuator. The movable wing is configured to have a slot between the movable wing and the stationary wing. The at least one plasma actuator is configured to control air flow through the slot.
    Type: Application
    Filed: April 3, 2019
    Publication date: October 24, 2019
    Applicant: SUBARU CORPORATION
    Inventors: Hiroki KATO, Maki KIKUCHI, Kentaro YOSHIDA, Nobuyuki NAKAZATO, Tomofumi IWAMOTO
  • Publication number: 20190300159
    Abstract: A flow control system includes a movable wing attachable to a wing of an aircraft, and a plasma actuator mountable on a surface of the movable wing. The flow control system is configured to control air flow around the wing by having the changing of the steering angle of the movable wing work in conjunction with the operation of the plasma actuator.
    Type: Application
    Filed: December 18, 2018
    Publication date: October 3, 2019
    Applicant: SUBARU CORPORATION
    Inventors: Maki KIKUCHI, Hiroki KATO, Mitsuru KONO, Kentaro YOSHIDA, Nobuyuki NAKAZATO
  • Patent number: 10416588
    Abstract: A charging member includes an electro-conductive substrate, an elastic layer, and a surface layer provided in this order. The elastic layer has, on an outer surface thereof, concave portions that are independent of each other, and hold insulating particles. The insulating particle is exposed to the surface of the elastic layer. A site in which an outer edge of the projection image derived from each of the insulating particles and an outer edge of a projection image derived from each of the concave portions are separated, exists. The charging member has convex portions derived from the insulating particles exposed to the surface of the elastic layer, and concave portions derived from the concave portions of the elastic layer. The surface layer has a volume resistivity of 1.0×1015 ?cm or more.
    Type: Grant
    Filed: October 20, 2017
    Date of Patent: September 17, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Hiroki Masu, Kazuhiro Yamauchi, Yuichi Kikuchi, Masaki Tsunoda, Takumi Furukawa
  • Patent number: 10403449
    Abstract: A direct-current circuit includes: a breaker that is inserted into the direct-current line and becomes a path for direct current when in a steady state; a resonance circuit connected in parallel with the breaker and superimposing resonance current on the direct current; and a first disconnector and a second disconnector connected to first and second connection points of the breaker and the resonance circuit, respectively, and forming a path for the direct current together with the breaker. The resonance circuit includes a series circuit that includes a capacitor and a reactor and generates the resonance current, a charging resistor for charging the capacitor with a direct-current potential of the direct-current line, a high-speed switch connected in series with the series circuit on the capacitor side and superimposing the resonance current on the direct current, and an arrester connected in parallel with the capacitor and the high-speed switch.
    Type: Grant
    Filed: June 10, 2015
    Date of Patent: September 3, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Shiken Ka, Hiroki Ito, Kunio Kikuchi, Makoto Miyashita, Kazuyori Tahata, Sho Tokoyoda, Kenji Kamei
  • Patent number: 10389255
    Abstract: A secondary-side module comprises: a synchronous rectification controller that controls a synchronous rectification transistor; and a shunt regulator that generates a current that corresponds to the difference between an output voltage VOUT of a DC/DC converter and the target value of the output voltage, which are housed in a single package. The multiple pins to be connected to the shunt regulator are all laid out along a first side of the package.
    Type: Grant
    Filed: March 3, 2016
    Date of Patent: August 20, 2019
    Assignee: ROHM CO., LTD.
    Inventors: Hiroki Kikuchi, Ryo Shimizu
  • Publication number: 20190254108
    Abstract: A network entity (5) sends, to a mobility management entity (6) or a subscriber server (9), a request message in order to configure the mobility management entity (6) to report a second identifier to be used by a radio access network node (2) for identifying a radio terminal (1). Further, the network entity (5) receives the second identifier from the mobility management entity (6) directly or through the subscriber server (9) and communicates with the radio access network node (2) by using the second identifier. It is thus, for example, possible to allow an MEC server (or an MEC application hosted on the MEC server) and the radio access network (RAN) node to directly exchange therebetween control messages regarding a specific radio terminal.
    Type: Application
    Filed: July 31, 2017
    Publication date: August 15, 2019
    Applicant: NEC CORPORATION
    Inventors: Takanori IWAI, Nobuhiko ITOH, Ling XU, Kenki TAKAGI, Toshiyuki TAMURA, Tomoaki HOKAO, Naoaki SUZUKI, Hisashi FUTAKI, Sadafuku HAYASHI, Kazuki EGUCHI, Kouichi KIMURA, Hiroki AOKI, Hideki BESSHO, Yoshinori WATANABE, Tooru KIKUCHI
  • Patent number: 10381940
    Abstract: A rectifier IC seals, in a single package, a first transistor chip which integrates a first transistor, a second transistor chip which integrates a second transistor and a controller chip which detects a first node voltage and a second node voltage of each of the transistors so as to perform on/off control on the transistors, and the rectifier IC functions as a secondary-side rectification means of an isolated switching power supply.
    Type: Grant
    Filed: January 3, 2018
    Date of Patent: August 13, 2019
    Assignee: Rohm Co., Ltd.
    Inventor: Hiroki Kikuchi
  • Publication number: 20190237367
    Abstract: The method for producing a pillar-shaped semiconductor device includes a step of forming a tubular SiO2 layer that surrounds side surfaces of a P+ layer 38a and N+ layers 38b and 8c formed on a Si pillar 6b by epitaxial crystal growth, forming an AlO layer 51 on a periphery of the SiO2 layer, forming a tubular contact hole by etching the tubular SiO2 layer using the AlO layer 51 as a mask, and filling the contact hole with W layers 52c, 52d, and 52e to form tubular W layers 52c, 52d, and 52e (including a buffer conductor layer) that have an equal width when viewed in plan and are in contact with side surfaces of the tops of the P+ layer 38a and the N+ layers 38b and 8c.
    Type: Application
    Filed: April 2, 2019
    Publication date: August 1, 2019
    Inventors: Fujio MASUOKA, Nozomu HARADA, Hiroki NAKAMURA, Phillipe MATAGNE, Yoshiaki KIKUCHI
  • Publication number: 20190222132
    Abstract: There is provided an isolated synchronous rectifying DC/DC converter that includes a drain terminal connected to a drain of a synchronous rectification transistor, a source terminal connected to a source of the synchronous rectification transistor; a comparator configured to compare a drain voltage of the drain terminal with a predetermined threshold voltage which set is based on a potential of the source terminal, a first flip-flop to which an OFF signal output from the comparator is input, a driver configured to output a gate signal to the synchronous rectification transistor based on an output signal of the first flip-flop, and a first abnormality detection circuit including an abnormality detection comparator configured to compare a voltage of the source terminal with a detection threshold voltage, and configured to output a first abnormality detection signal based on an output of the abnormality detection comparator.
    Type: Application
    Filed: November 13, 2018
    Publication date: July 18, 2019
    Inventor: Hiroki KIKUCHI
  • Publication number: 20190222134
    Abstract: A synchronous rectification controller includes: a drain terminal connected to a drain of a synchronous rectification transistor; a first comparator configured to compare a drain voltage of the drain terminal with a first threshold voltage; a second comparator configured to compare the drain voltage of the drain terminal with a second threshold voltage; a flip-flop to which an ON signal output from the first comparator and an OFF signal output from the second comparator are input; a driver configured to output a gate signal to the synchronous rectification transistor based on an output signal of the flip-flop; and a threshold adjusting part configured to adjust the second threshold voltage based on the drain voltage.
    Type: Application
    Filed: January 14, 2019
    Publication date: July 18, 2019
    Inventor: Hiroki KIKUCHI
  • Patent number: 10348212
    Abstract: A synchronous rectification controller includes a first gate pin coupled to a gate of a first synchronous rectification transistor, a first drain pin coupled to a drain of the first synchronous rectification transistor, a second gate pin coupled to a gate of a second synchronous rectification transistor, a second drain pin coupled to a drain of the second synchronous rectification transistor, a source pin coupled to a ground, a multiplexer selecting a voltage applied to the first drain pin in a first state, and selecting a voltage applied to the second drain pin in a second state, a pulse generator generating a pulse signal based on an output voltage of the multiplexer, a driving circuit switching the first synchronous rectification transistor according to the pulse signal in the first state, and switching the second synchronous rectification transistor according to the pulse signal in the second state.
    Type: Grant
    Filed: December 15, 2017
    Date of Patent: July 9, 2019
    Assignee: ROHM CO., LTD.
    Inventor: Hiroki Kikuchi
  • Patent number: 10344212
    Abstract: One aspect is contemplated for providing a device having a liquid crystal material exhibiting a dielectric constant of 1000 or more at a temperature at which a specific liquid crystal phase is developed, and a unit configured to apply voltage to the liquid crystal material at the temperature at which the specific liquid crystal phase is developed.
    Type: Grant
    Filed: February 15, 2017
    Date of Patent: July 9, 2019
    Assignees: KYUSHU UNIVERSITY, NATIONAL UNIVERSITY CORPORATION, JNC CORPORATION, JNC PETROCHEMICAL CORPORATION
    Inventors: Hirotsugu Kikuchi, Yasushi Okumura, Hiroki Higuchi, Hiroya Nishikawa, Kazuya Shiroshita, Shinichi Yamamoto, Koki Sago, Yasuhiro Haseba