Patents by Inventor Kenichi Mizugaki

Kenichi Mizugaki 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: 10923793
    Abstract: An object of the present invention is to improve an antenna for IoT services intended for things that constitute an internal space. There is provided an antenna device including an antenna and a dielectric body. In an internal space which is constituted by plural faces including a first face which is an electrically conductive body, the antenna device is adapted to have a shape to be fit inside a hole in the first face. The antenna device is installed, not protruding from the hole to an outer space. The antenna and the dielectric body are placed in series between the internal space and the outer space.
    Type: Grant
    Filed: February 15, 2019
    Date of Patent: February 16, 2021
    Assignee: HITACHI, LTD.
    Inventors: Masami Oonishi, Kenichi Mizugaki, Ryosuke Fujiwara, Rintaro Katayama
  • Publication number: 20210013616
    Abstract: An antenna device includes a conductive manhole cover for partitioning an internal space of a manhole and an external space, a wireless device installed in the internal space, and a base station that is installed in the external space and transfers a radio wave with respect to the wireless device. When a notch portion is formed on the edge of the manhole cover and the manhole cover is attached to an opening of the manhole, a slot-shaped void is formed. By using this void as a slot antenna, radio waves from the wireless device can be re-emitted to the external space. With such a configuration, it is not necessary to specially prepare a slot antenna, and a low-cost antenna device can be realized.
    Type: Application
    Filed: June 23, 2020
    Publication date: January 14, 2021
    Inventors: Masami OONISHI, Kenichi MIZUGAKI, Rintaro KATAYAMA, Ryosuke FUJIWARA
  • Publication number: 20200272516
    Abstract: A processor 204 of a sensor device performs measurement processing by one or a plurality of sensors 203 and transmission processing of sensor data generated by the measurement processing. The sensor device includes a processing routine table 211 that stores a processing routine configured to include, corresponding to an identifier for identifying processing performed by a processor, a type of the processing, an execution trigger of the processing, and trigger information that prescribes a trigger for transmitting the sensor data. The processor controls processing in a processing routine of the processing routine table, based on trigger information, so that the sensor data subjected to measurement processing is immediately transmitted, or temporarily stored in a buffer 212 and transmitted after a predetermined time.
    Type: Application
    Filed: February 13, 2020
    Publication date: August 27, 2020
    Inventors: Rintaro KATAYAMA, Ryosuke FUJIWARA, Kenichi MIZUGAKI
  • Publication number: 20190368893
    Abstract: A management server 103 holds a parameter of a sensor device 101 and change management information related to a change in the parameter, and transmits the changed parameter and the change management information to the sensor device. The sensor device 101 holds the parameter and the change management information transmitted from the management server, and transmits the change management information to the management server together with measurement data. The management server collates the received change management information and preliminarily-held change management information to determine the change in the parameter on the basis of a result of the collation.
    Type: Application
    Filed: May 10, 2019
    Publication date: December 5, 2019
    Inventors: Rintaro KATAYAMA, Kenichi MIZUGAKI, Ryosuke FUJIWARA
  • Publication number: 20190296866
    Abstract: An object of the present invention is to prevent wrong registration due to an operation error and an input error in installation work of a sensor device. A terminal acquires a first identifier which the sensor device has and further, acquires positional information using a positioning device. The terminal transmits the first identifier and the positional information respectively acquired to a management server. The sensor device transmits a second identifier held by itself to the management server. The management server correlates the second identifier and the positional information when the management server judges that the first identifier and the second identifier are located in predetermined relation, registers them in a storage, and the management server notifies the sensor device of a result of the judgment.
    Type: Application
    Filed: February 11, 2019
    Publication date: September 26, 2019
    Inventors: Rintaro Katayama, Kenichi Mizugaki, Ryosuke Fujiwara
  • Publication number: 20190267695
    Abstract: An object of the present invention is to improve an antenna for IoT services intended for things that constitute an internal space. There is provided an antenna device including an antenna and a dielectric body. In an internal space which is constituted by plural faces including a first face which is an electrically conductive body, the antenna device is adapted to have a shape to be fit inside a hole in the first face. The antenna device is installed, not protruding from the hole to an outer space. The antenna and the dielectric body are placed in series between the internal space and the outer space.
    Type: Application
    Filed: February 15, 2019
    Publication date: August 29, 2019
    Inventors: Masami OONISHI, Kenichi MIZUGAKI, Ryosuke FUJIWARA, Rintaro KATAYAMA
  • Patent number: 9325368
    Abstract: A period is defined to execute the sequences (processes) of communication data acquisition, measuring communication quality, communication quality data acquisition, and channel change. Processing is controlled to execute each process within a time limit set for each process and execute all processes in one cycle. This avoids that a delayed sequence influences and delays other sequences and can suppress delays. If processing fails to finish a sequence, it will resume the same sequence in the next cycle. For communication stations sharing timeslots, there are provided offset periods differing in length before the start of carrier sense in the timeslots for these stations. Consequently, even under a condition in which packet collision may occur, the collision of packets can be avoided by detecting a packet sent to another station by carrier sense. Moreover, by controlling sending priority of packets in the send queue of the gateway, sending delay can be avoided.
    Type: Grant
    Filed: February 4, 2013
    Date of Patent: April 26, 2016
    Assignee: Hitachi, Ltd.
    Inventors: Yasutaka Serizawa, Takashi Yano, Masayuki Miyazaki, Kenichi Mizugaki
  • Publication number: 20140293855
    Abstract: In an ad-hoc wireless communication system, when there occurs a disparity in the remaining amounts of the batteries of wireless routers, it is impossible for each wireless router to change a communication route by itself. As proposed herein, in an invented multi-hop wireless network for communication via a plurality of routers, a wireless router operating intermittently changes its intermittent operation interval depending on its circumstances by its own judgment.
    Type: Application
    Filed: May 21, 2012
    Publication date: October 2, 2014
    Inventors: Yasutaka Serizawa, Kenichi Mizugaki, Masayuki Miyazaki
  • Patent number: 8755296
    Abstract: A wireless communication device includes a sensor processing unit that generates sensor data including a measurement result acquired by a sensor; a communication measurement unit that generates communication quality data including a communication state for transmitting a packet; a compression determination unit that determines compression rates of first sensor data and first communication quality data according to the contents of the first sensor data including the transmitted sensor data and the generated sensor data or the contents of the first communication quality data including the transmitted sensor data and the generated communication quality data; a compression unit that compresses the first sensor data and the first communication quality data according to the determined compression rates; and a wireless communication unit that transmits a packet including the compressed first sensor data and the compressed first communication quality data to another wireless communication device or the access point.
    Type: Grant
    Filed: December 1, 2011
    Date of Patent: June 17, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Masayuki Miyazaki, Kenichi Mizugaki, Masaru Kokubo, Hideyuki Nagaishi, Nobuhisa Kobayashi
  • Publication number: 20130235905
    Abstract: A period is defined to execute the sequences (processes) of communication data acquisition, measuring communication quality, communication quality data acquisition, and channel change. Processing is controlled to execute each process within a time limit set for each process and execute all processes in one cycle. This avoids that a delayed sequence influences and delays other sequences and can suppress delays. If processing fails to finish a sequence, it will resume the same sequence in the next cycle. For communication stations sharing timeslots, there are provided offset periods differing in length before the start of carrier sense in the timeslots for these stations. Consequently, even under a condition in which packet collision may occur, the collision of packets can be avoided by detecting a packet sent to another station by carrier sense. Moreover, by controlling sending priority of packets in the send queue of the gateway, sending delay can be avoided.
    Type: Application
    Filed: February 4, 2013
    Publication date: September 12, 2013
    Applicant: Hitachi,Ltd.
    Inventors: YASUTAKA SERIZAWA, Takashi Yano, Masayuki Miyazaki, Kenichi Mizugaki
  • Publication number: 20120155301
    Abstract: A wireless communication device includes a sensor processing unit that generates sensor data including a measurement result acquired by a sensor; a communication measurement unit that generates communication quality data including a communication state for transmitting a packet; a compression determination unit that determines compression rates of first sensor data and first communication quality data according to the contents of the first sensor data including the transmitted sensor data and the generated sensor data or the contents of the first communication quality data including the transmitted sensor data and the generated communication quality data; a compression unit that compresses the first sensor data and the first communication quality data according to the determined compression rates; and a wireless communication unit that transmits a packet including the compressed first sensor data and the compressed first communication quality data to another wireless communication device or the access point.
    Type: Application
    Filed: December 1, 2011
    Publication date: June 21, 2012
    Applicant: Hitachi, Ltd.
    Inventors: Masayuki MIYAZAKI, Kenichi Mizugaki, Masaru Kokubo, Hideyuki Nagaishi, Nobuhisa Kobayashi
  • Publication number: 20110310748
    Abstract: A wireless communication system provides high reliability wireless communications even when large scale interference affecting the entire system has occurred in ad hoc wireless communication systems. The node, access point, and intermediate nodes are each equipped with multiple wireless standards, and notify a wireless communication control device called a coordinator that sets the network communication paths with communication path information obtained by measuring the state of communication paths in the vicinity of their own respective nodes. The coordinator that now knows the communication status, issues instructions for setting plural routes using multiple wireless standards between the node and the access points as well as which wireless standard to use to implement communications between each intermediate zone, and each intermediate node conveys the measurement data while complying with those instructions.
    Type: Application
    Filed: June 16, 2011
    Publication date: December 22, 2011
    Inventors: Kenichi MIZUGAKI, Masaru Kokubo, Masayuki Miyazaki
  • Patent number: 8073465
    Abstract: In a system for measuring a time difference of arrival of signals for positioning, an accurate time difference is measured by a receiver which is reduced in power consumption, size, and cost. The system comprises a node (under measurement) for transmitting a positioning signal, a reference station for transmitting a reference signal, and a plurality of access points for receiving the positioning signal and reference signal, and a server connected to the plurality of access points through a network. Each of the plurality of access points measures a time difference between the reception of the positioning signal and the reception of the reference signal, and a frequency deviation from the reference station, using a clock signal and a signal for shifting the clock signal, and the server calculates the position of the node based on the measured time difference and frequency deviation.
    Type: Grant
    Filed: December 14, 2010
    Date of Patent: December 6, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Tatsuo Nakagawa, Masayuki Miyazaki, Kenichi Mizugaki, Ryosuke Fujiwara
  • Publication number: 20110092223
    Abstract: In a system for measuring a time difference of arrival of signals for positioning, an accurate time difference is measured by a receiver which is reduced in power consumption, size, and cost. The system comprises a node (under measurement) for transmitting a positioning signal, a reference station for transmitting a reference signal, and a plurality of access points for receiving the positioning signal and reference signal, and a server connected to the plurality of access points through a network. Each of the plurality of access points measures a time difference between the reception of the positioning signal and the reception of the reference signal, and a frequency deviation from the reference station, using a clock signal and a signal for shifting the clock signal, and the server calculates the position of the node based on the measured time difference and frequency deviation.
    Type: Application
    Filed: December 14, 2010
    Publication date: April 21, 2011
    Inventors: Tatsuo Nakagawa, Masayuki Miyazaki, Kenichi Mizugaki, Ryosuke Fujiwara
  • Patent number: 7912481
    Abstract: An invention for estimating the first path of an arrival signal by a method and device with a simple structure and lower power consumption. In this method, the nominal pulse repetition frequency or its integer multiple are A/D converted at a frequency less than the multiplicative inverse of the pulse width, the AD conversion timing is offset by time resolution ?t and the receive signal measured, data stored in a RAM, and the first path output time is estimated based on sequentially rearranging of the stored waveform data.
    Type: Grant
    Filed: June 25, 2007
    Date of Patent: March 22, 2011
    Assignee: Hitachi Ltd.
    Inventors: Ryosuke Fujiwara, Kenichi Mizugaki, Masayuki Miyazaki
  • Patent number: 7881684
    Abstract: In a system for measuring a time difference of arrival of signals for positioning, an accurate time difference is measured by a receiver which is reduced in power consumption, size, and cost. The system comprises a node (under measurement) for transmitting a positioning signal, a reference station for transmitting a reference signal, and a plurality of access points for receiving the positioning signal and reference signal, and a server connected to the plurality of access points through a network. Each of the plurality of access points measures a time difference between the reception of the positioning signal and the reception of the reference signal, and a frequency deviation from the reference station, using a clock signal and a signal for shifting the clock signal, and the server calculates the position of the node based on the measured time difference and frequency deviation.
    Type: Grant
    Filed: February 17, 2006
    Date of Patent: February 1, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Tatsuo Nakagawa, Masayuki Miyazaki, Kenichi Mizugaki, Ryosuke Fujiwara
  • Patent number: 7808397
    Abstract: A sensor transmits and receives wireless signals at intervals. A sensor unit, a processor 130, a wireless transmitter circuit, and a wireless receiver circuit are activated in sequence only for a fixed time when the electric power generated by a generator circuit and charged in a capacitor reaches a preset level. Sensing information detected by the sensor unit is processed by the processor circuit and, information on the number of receivable bytes is added to the processing results in the wireless receiver circuit. This added information is sent as sensor information to the wireless host from the wireless transmitting circuit, and the wireless receiver circuit that activated after the wireless transmitter circuit was activated, receives a control information signal from the wireless host. This received information is processed in the processor circuit.
    Type: Grant
    Filed: July 3, 2007
    Date of Patent: October 5, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Hiroshi Arita, Masaru Kokubo, Kenichi Mizugaki
  • Patent number: 7672362
    Abstract: A communications apparatus which ensures a predetermined communication quality even when an external environment changes dynamically, and enhances a throughput for overall system, thereby achieving favorable transmission efficiency. A communications apparatus having a receiver and a transmitter and carries out sending/receiving by use of a pulse train is provided with a communication environment measuring section to measure a communication status based on an output from the receiver. The transmitter is configured such that it transmits a transmission signal, in which the transmission rate of data to be transmitted and the pulse energy have been controlled in association with each other, according to a result of the measurement.
    Type: Grant
    Filed: December 6, 2004
    Date of Patent: March 2, 2010
    Assignee: Renesas Technology Corp.
    Inventors: Ryosuke Fujiwara, Kenichi Mizugaki
  • Patent number: 7627329
    Abstract: To provide a method of measuring a position of a node by using a radio communication system which comprises the node to send a position measuring signal, and a plurality of base stations to receive radio signals from the node, the method including: the base stations watching signals from the node through a predetermined channel; at least one of the base stations sending a reference signal after receiving of the position measuring signal; at least two of the base stations measuring the reception timing of the position measuring signal and the reception timing of the reference signal; and calculating the position of the node by using the reception timing of the position measuring signal and the reference signal measured by the base stations which have received the reference signal, and position information of the base station which has received the position measuring signal.
    Type: Grant
    Filed: October 27, 2004
    Date of Patent: December 1, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Kenichi Mizugaki, Toshiyuki Odaka, Shoichi Masui
  • Publication number: 20080232297
    Abstract: A node location system for detecting a node by receiving two or more access points. The node location system includes a node, a reference station, multiple access points, a server, and a network. After receiving a location signal, the reference station sends a reference signal, and the access points receive a position measurement signal and a reference signal, and detects a specified pattern from the received location signal and reference signal, and measures the time from detecting the specified pattern from the location signal until detecting the time from the reference signal, and sends the signal-receive-time information including that measured time to the server, and the server calculates the difference between the time the reference station received the location signal and the time that the access points received the location signal, and then calculates the node position based on this calculated differential.
    Type: Application
    Filed: February 5, 2008
    Publication date: September 25, 2008
    Inventors: Kenichi Mizugaki, Ryosuke Fujiwara