Patents by Inventor Takeo Fujii
Takeo Fujii 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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Patent number: 10651027Abstract: A light-emitting device includes: a substrate having a groove extending in a first direction and a first surface and a second surface respectively arranged to sandwich the groove in a second direction; a first electrode provided on the first surface; a second electrode provided on the second surface; a graphite thin film provided on the first electrode and the second electrode and extending from the first electrode to the second electrode along the second direction in such a way as to be astride the groove; a third electrode provided on the graphite thin film in such a way as to be opposite the first electrode via the graphite thin film; and a fourth electrode provided on the graphite thin film in such a way as to be opposite the second electrode via the graphite thin film.Type: GrantFiled: July 10, 2019Date of Patent: May 12, 2020Assignee: HAMAMATSU PHOTONICS K.K.Inventors: Takaaki Nagata, Takeo Fujii, Motohiro Suyama
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Patent number: 10580952Abstract: A light-emitting device according to one embodiment includes: a substrate; a graphite thin film disposed on the substrate; and an electrode provided on a second surface of the graphite thin film on an edge portion of the graphite thin film, the second surface of the graphite thin film being opposite from a first surface of the graphite thin film, the first surface of the graphite thin film opposed to the substrate. A plurality of protrusions for supporting the graphite thin film is formed on a surface of the substrate opposed to the graphite thin film, at least over an entire region where the substrate and a portion of the graphite thin film other than the edge portion overlap each other when viewed along a thickness direction of the substrate.Type: GrantFiled: October 17, 2018Date of Patent: March 3, 2020Assignees: KEIO UNIVERSITY, HAMAMATSU PHOTONICS K.K.Inventors: Hideyuki Maki, Motohiro Suyama, Takaaki Nagata, Takeo Fujii
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Publication number: 20200020519Abstract: A light-emitting device includes: a substrate having a groove extending in a first direction and a first surface and a second surface respectively arranged to sandwich the groove in a second direction; a first electrode provided on the first surface; a second electrode provided on the second surface; a graphite thin film provided on the first electrode and the second electrode and extending from the first electrode to the second electrode along the second direction in such a way as to be astride the groove; a third electrode provided on the graphite thin film in such a way as to be opposite the first electrode via the graphite thin film; and a fourth electrode provided on the graphite thin film in such a way as to be opposite the second electrode via the graphite thin film.Type: ApplicationFiled: July 10, 2019Publication date: January 16, 2020Applicant: HAMAMATSU PHOTONICS K.K.Inventors: Takaaki NAGATA, Takeo FUJII, Motohiro SUYAMA
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Patent number: 10288036Abstract: The stability of power generation efficiency against variation of fluid speed and direction can be improved. The disclosed rotor 1 for a wind or water power machine includes a hub 10, supported by a main shaft, and blades 20, each having a root end 21 connected to the hub. In a projection plane perpendicular to a rotational center axis O of the rotor, a leading edge 31 of the blade has leading edge bulge portions 36 and 37 protruding forward in the rotor rotational direction only at two different locations in the rotor radial direction.Type: GrantFiled: November 24, 2015Date of Patent: May 14, 2019Assignee: TERAL INC.Inventors: Hao Liu, Takeo Fujii, Ryosuke Yoshimura
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Publication number: 20190123254Abstract: A light-emitting device according to one embodiment includes: a substrate; a graphite thin film disposed on the substrate; and an electrode provided on a second surface of the graphite thin film on an edge portion of the graphite thin film, the second surface of the graphite thin film being opposite from a first surface of the graphite thin film, the first surface of the graphite thin film opposed to the substrate. A plurality of protrusions for supporting the graphite thin film is formed on a surface of the substrate opposed to the graphite thin film, at least over an entire region where the substrate and a portion of the graphite thin film other than the edge portion overlap each other when viewed along a thickness direction of the substrate.Type: ApplicationFiled: October 17, 2018Publication date: April 25, 2019Applicants: KEIO UNIVERSITY, HAMAMATSU PHOTONICS K.K.Inventors: Hideyuki MAKI, Motohiro SUYAMA, Takaaki NAGATA, Takeo FUJII
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Patent number: 9938957Abstract: A rotor for a wind/water power machine that can reduce fluid resistance. A rotor provided with a hub and blades. A projected plane perpendicular to a rotational center axis line of the rotor, front edges of the blades protrude, in at least one part, forward in the rotational direction of the rotor relative to a first line segment; front edge protruding tips thereof are disposed in positions separated outward in the radial direction of the rotor from the outer peripheral edge of the hub by a length 0.4 to 0.6 times the length of the blade; and portions of the front edges of the blades that extend from the ends on the inside in the radial direction of the rotor to the front edge protruding tips are curved or bent convexly, in at least one part, rearward in the rotational direction of the rotor relative to a second line segment.Type: GrantFiled: May 28, 2014Date of Patent: April 10, 2018Assignee: TERAL INC.Inventors: Hao Liu, Takeo Fujii
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Publication number: 20170089322Abstract: The stability of power generation efficiency against variation of fluid speed and direction can be improved. The disclosed rotor 1 for a wind or water power machine includes a hub 10, supported by a main shaft, and blades 20, each having a root end 21 connected to the hub. In a projection plane perpendicular to a rotational center axis O of the rotor, a leading edge 31 of the blade has leading edge bulge portions 36 and 37 protruding forward in the rotor rotational direction only at two different locations in the rotor radial direction.Type: ApplicationFiled: November 24, 2015Publication date: March 30, 2017Applicant: TERAL INC.Inventors: Hao LIU, Takeo FUJII, Ryosuke YOSHIMURA
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Patent number: 9282468Abstract: A communication device, a communication method and a communication system that enable an increase in channel capacity at cell edges of a plurality of cells. Data transmission is implemented by transmission stations, which are base stations of adjacent cells, by MIMO transmission. A relay station receives radio waves that are transmitted by both the transmission station and the transmission station, and acquires data transmitted by the transmission station and data transmitted by the transmission station. The relay station transmits data to reception stations in adjacent cells according to multi-user MIMO transmission. The data transmitted by the transmission station is received by the reception station via the relay station, and the data transmitted by the transmission station is received by the reception station via the relay station. The present invention can be used in cellular systems.Type: GrantFiled: October 18, 2011Date of Patent: March 8, 2016Assignee: THE UNIVERSITY OF ELECTRO-COMMUNICATIONSInventors: Takeo Fujii, Kensuke Fujii
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Publication number: 20150285217Abstract: A rotor for a wind/water power machine that can reduce fluid resistance. A rotor provided with a hub and blades. A projected plane perpendicular to a rotational center axis line of the rotor, front edges of the blades protrude, in at least one part, forward in the rotational direction of the rotor relative to a first line segment; front edge protruding tips thereof are disposed in positions separated outward in the radial direction of the rotor from the outer peripheral edge of the hub by a length 0.4 to 0.6 times the length of the blade; and portions of the front edges of the blades that extend from the ends on the inside in the radial direction of the rotor to the front edge protruding tips are curved or bent convexly, in at least one part, rearward in the rotational direction of the rotor relative to a second line segment.Type: ApplicationFiled: May 28, 2014Publication date: October 8, 2015Inventors: Hao Liu, Takeo Fujii
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Patent number: 8699362Abstract: In cooperative sensing in which a plurality of cognitive radio apparatus collaboratively exchange sensing information on a status of frequency band usage as a secondary system, the sensing information is efficiently exchanged in the secondary system without influencing communication of the primary system. In a radio communication system according to this invention, a first radio communication device includes means for observing a surrounding radio communication environment, means for converting information obtained by the observation into a parameter used for radio communication, and means for performing transmission by using the parameter, and a second radio communication device includes means for receiving a signal transmitted from the first radio communication device and means for extracting, from the received signal, information on the surrounding radio communication environment that is observed on a transmission side.Type: GrantFiled: December 12, 2008Date of Patent: April 15, 2014Assignees: NEC Corporation, The University of Electro-CommunicationsInventors: Masayuki Ariyoshi, Kazushi Muraoka, Takeo Fujii, Mai Ohta
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Publication number: 20130208654Abstract: A communication device, a communication method and a communication system that enable an increase in channel capacity at cell edges of a plurality of cells. Data transmission is implemented by transmission stations, which are base stations of adjacent cells, by MIMO transmission. A relay station receives radio waves that are transmitted by both the transmission station and the transmission station, and acquires data transmitted by the transmission station and data transmitted by the transmission station. The relay station transmits data to reception stations in adjacent cells according to multi-user MIMO transmission. The data transmitted by the transmission station is received by the reception station via the relay station, and the data transmitted by the transmission station is received by the reception station via the relay station. The present invention can be used in cellular systems.Type: ApplicationFiled: October 18, 2011Publication date: August 15, 2013Applicant: THE UNIVERSITY OF ELECTRO-COMMUNICATIONSInventors: Takeo Fujii, Kensuke Fujii
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Patent number: 8509696Abstract: Provided is a radio communication system including a plurality of cognitive radio apparatuses each including at least: a transmission/reception element; and a detection element for detecting a radio wave transmitted from a radio apparatus of another radio communication system, in which the radio communication system further includes a control section for determining a frequency band on which each cognitive radio apparatus of a radio apparatus group including the plurality of cognitive radio apparatuses is to detect the radio wave.Type: GrantFiled: December 12, 2008Date of Patent: August 13, 2013Assignees: NEC Corporation, The University of Electro-CommunicationsInventors: Kazushi Muraoka, Masayuki Ariyoshi, Takeo Fujii
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Patent number: 8472378Abstract: After checking a status of frequency band usage of a primary system by preliminary sensing, a master node transmits to slave nodes a sensing request containing a target frequency band for cooperative sensing. The slave nodes perform spectrum sensing according to specified parameters and send, as responses, results thereof to the master node. The master node collectively receives these results, comprehensively determines the sensing results of the slave nodes, and makes a final determination on whether or not the target frequency band is available.Type: GrantFiled: December 12, 2008Date of Patent: June 25, 2013Assignees: NEC Corporation, The University of Electro-CommunicationsInventors: Masayuki Ariyoshi, Kazushi Muraoka, Takeo Fujii
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Publication number: 20130105874Abstract: A semiconductor device includes a gate electrode provided on a channel region in a semiconductor material layer having one type through a second insulating film; a capacitor electrode portion integrally formed with the gate electrode on the gate electrode; and a first electrode laterally surrounding the capacitor electrode portion through a first insulating film.Type: ApplicationFiled: December 28, 2011Publication date: May 2, 2013Applicant: ELPIDA MEMORY, INC.Inventors: Takeo FUJII, Masao TAGUCHI
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Patent number: 8165059Abstract: The degradation of the communication characteristics and the throughput of the entire network can be improved. The failures of sending and receiving are reduced and the transmission time is reduced. In a multi-hop communication method how the source terminal 11 transmits and receives the packets with destination terminal 12 through at least one relay terminal 13, the relay terminal 13 and/or the destination terminal 12 includes a table TBL of use channel candidates that is issued by the source terminal 11, and the relay terminal 13 and/or the destination terminal 12 selects a use channel for sending the data packets from the channel candidates registered in the table and sends the data packets.Type: GrantFiled: January 30, 2007Date of Patent: April 24, 2012Assignee: The University of Electro-CommunicationsInventors: Takeo Fujii, Hiromasa Uchiyama
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Publication number: 20110228683Abstract: In cooperative sensing in which a plurality of cognitive radio apparatus collaboratively exchange sensing information on a status of frequency band usage as a secondary system, the sensing information is efficiently exchanged in the secondary system without influencing communication of the primary system. In a radio communication system according to this invention, a first radio communication device includes means for observing a surrounding radio communication environment, means for converting information obtained by the observation into a parameter used for radio communication, and means for performing transmission by using the parameter, and a second radio communication device includes means for receiving a signal transmitted from the first radio communication device and means for extracting, from the received signal, information on the surrounding radio communication environment that is observed on a transmission side.Type: ApplicationFiled: December 12, 2008Publication date: September 22, 2011Inventors: Masayuki Ariyoshi, Kazushi Muraoka, Takeo Fujii, Mai Ohta
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Patent number: 7957334Abstract: This invention provides a communication system, a repeater terminal in the communication system and a communication method for improving the characteristics in a multi-hop communication by a diversity gain and reduces the power consumption by wasteful retransmission in packet transmission at a wireless terminal. When a transmitter terminal S sends a packet first time, repeater terminals R1-R13 perform a data transmission by retransmission at all the terminals which received the packet. When a transmitter terminal S sends a packet second time, a repeater terminal determines its own contribution based on the hop numbers of the repeating in the packet transmission and the return ACK (or NACK) repeating. The repeater terminal with a high contribution autonomously determines to be in “repeater mode” and the repeater terminal with a low contribution autonomously determines to be in “sleep mode”.Type: GrantFiled: January 20, 2006Date of Patent: June 7, 2011Assignee: The University of Electro-CommunicationsInventors: Takeo Fujii, Erina Kojima
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Publication number: 20100279725Abstract: Provided is a radio communication system including a plurality of cognitive radio apparatuses each including at least: a transmission/reception element; and a detection element for detecting a radio wave transmitted from a radio apparatus of another radio communication system, in which the radio communication system further includes a control section for determining a frequency band on which each cognitive radio apparatus of a radio apparatus group including the plurality of cognitive radio apparatuses is to detect the radio wave.Type: ApplicationFiled: December 12, 2008Publication date: November 4, 2010Applicants: NEC CORPORATION, THE UNIVERSITY OF ELECTRO-COMMUNICATIONSInventors: Kazushi Muraoka, Masayuki Ariyoshi, Takeo Fujii
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Patent number: D803781Type: GrantFiled: February 9, 2016Date of Patent: November 28, 2017Assignee: TERAL INC.Inventor: Takeo Fujii
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Patent number: D803782Type: GrantFiled: February 9, 2016Date of Patent: November 28, 2017Assignee: TERAL INC.Inventor: Takeo Fujii