Patents by Inventor Tomoaki Yoshida
Tomoaki Yoshida 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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Publication number: 20200275815Abstract: An autonomous vacuum cleaner that can reduce the footprint in a standby state is provided. An autonomous vacuum cleaner (1) includes a vacuum cleaner body (2) and a charging station (6). The charging station (6) has a hook (64) that latches a latched member (16) provided to a rear side of the vacuum cleaner body (2), and a lift driver (61) that raises and lowers the hook (64), and is configured to be capable of storing the vacuum cleaner body (2) in a standing state where the vacuum cleaner body (2) is hoisted and the rear side is oriented upward.Type: ApplicationFiled: September 13, 2017Publication date: September 3, 2020Inventors: Takayuki FURUTA, Masahiro TOMONO, Hideaki YAMATO, Tomoaki YOSHIDA, Masaharu SHIMIZU, Yu OKUMURA, Kengo TODA, Takashi KODACHI, Kiyoshi IRIE, Yoshitaka HARA, Kazuki OGIHARA
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Publication number: 20200245837Abstract: An autonomous vacuum cleaner is provided which can accurately acquire surrounding information related to target objects in the surroundings. An autonomous vacuum cleaner (1) includes: a vacuum cleaner body (2); a front sensor (31) configured to detect a target object at a far distance from the vacuum cleaner body (2); and a contact sensor (32) configured to detect a target object at a near distance from the vacuum cleaner body (2). A controller (5) is configured including a surrounding information generator (45) configured to generate surrounding information related to target objects around the vacuum cleaner body (2), on the basis of far information detected by the front sensor (31) and near information detected by the contact sensor (32).Type: ApplicationFiled: October 13, 2017Publication date: August 6, 2020Inventors: Takayuki FURUTA, Masahiro TOMONO, Hideaki YAMATO, Tomoaki YOSHIDA, Masaharu SHIMIZU, Yu OKUMURA, Kengo TODA, Takashi KODACHI, Kiyoshi IRIE, Yoshitaka HARA, Kazuki OGIHARA
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Publication number: 20200089249Abstract: Provided is a self-propelled vacuum configured so that depending on an obstacle, the self-propelled vacuum can move over the obstacle without performing avoidance operation to shorten cleaning time. A self-propelled vacuum 1 includes a vacuum body 2, a suction unit 5 for sucking dust and the like on a floor surface F, a traveling drive unit 4 configured to drive wheels 21, a front sensor 51 configured to sense an obstacle S in the front in a traveling direction, and a vehicle height adjustment unit 6 configured to move the wheels 21 up and down to adjust the vehicle height of the vacuum body 2. In a case where the traveling drive unit 4 is driven and the front sensor 51 senses the obstacle S during self-propelling, the vehicle height adjustment unit 6 increases the vehicle height to a predetermined height, and thereafter, the self-propelled vacuum 1 moves over the obstacle S while the vehicle height is being adjusted such that a distance to the obstacle S is held within a predetermined range.Type: ApplicationFiled: June 7, 2017Publication date: March 19, 2020Inventors: Takayuki FURUTA, Masahiro TOMONO, Hideaki YAMATO, Tomoaki YOSHIDA, Masaharu SHIMIZU, Yu OKUMURA, Kengo TODA, Takashi KODACHI, Kiyoshi IRIE, Yoshitaka HARA, Kazuki OGIHARA
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Patent number: 10361807Abstract: An OLT configures combinations of wavelength pairs used for upstream and downstream signals, in a wavelength multiplexing optical communication system which performs single-core bidirectional transmission of a plurality of upstream and downstream signals, in such a way that the maximum value of the chromatic dispersion delay amount calculated from each wavelength pair is less than the maximum value of the chromatic dispersion delay amounts calculated when the combinations of wavelength pairs used for upstream and downstream signals are both allocated from the short wave side.Type: GrantFiled: January 6, 2016Date of Patent: July 23, 2019Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Katsuhisa Taguchi, Tomoaki Yoshida, Kota Asaka, Shunji Kimura
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Patent number: 10230485Abstract: In a case where a wavelength to be assigned to a subscriber-side device, to which a downstream wavelength has been assigned, is to be changed from the currently used (Source) downstream wavelength to a different changeover target (Target) downstream wavelength, a downstream wavelength changeover instruction message that indicates the change target wavelength is generated. In a case where a wavelength to be assigned to the subscriber-side device, to which an upstream wavelength has been assigned, is to be changed from the currently used (Source) upstream wavelength to a different changeover target (Target) upstream wavelength, an upstream wavelength changeover instruction message that indicates the change target wavelength is generated. The downstream wavelength changeover instruction message and the upstream wavelength changeover instruction message are respectively independently generated, and only the wavelength for which the wavelength changeover instruction message was generated is changed.Type: GrantFiled: April 20, 2016Date of Patent: March 12, 2019Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tomoaki Yoshida, Kota Asaka, Shunji Kimura
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Patent number: 10211944Abstract: A station-side device performs transmission and reception of an optical signal to and from a subscriber-side device, and includes a communication control unit configured to perform optical signal communication using a plurality of wavelengths by wavelength division multiplexing and time division multiplexing; and a registration unit configured to set an acceptance period in at least one wavelength among the plurality of wavelengths, to perform a new registration of a subscriber-side device in response to a registration request of the subscriber-side device received within the acceptance period, and not to set the acceptance period in at least one other wavelength among the plurality of wavelengths.Type: GrantFiled: May 24, 2016Date of Patent: February 19, 2019Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tomoaki Yoshida, Shigeru Kuwano
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Patent number: 10211945Abstract: A station-side device of the present invention includes: a wavelength change instruction unit that issues, to a subscriber-side device, a wavelength change instruction to change a transfer-source wavelength assigned to the subscriber-side device to a transfer-target wavelength different from the transfer-source wavelength; a transfer-source port that transmits and receives an optical signal of the transfer-source wavelength; a transfer-target port that transmits and receives an optical signal of the transfer-target wavelength; a transfer-source port monitoring unit that detects a connection between the transfer-source port and the subscriber-side device; a transfer-target port monitoring unit that detects a connection between the transfer-target port and the subscriber-side device; a transfer-source timer that counts, at the transfer-source port, an elapsed time from a predetermined starting time in response to the wavelength change instruction, and ends the counting of the elapsed time in a case where changeType: GrantFiled: April 20, 2016Date of Patent: February 19, 2019Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventor: Tomoaki Yoshida
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Publication number: 20180351685Abstract: An OLT configures combinations of wavelength pairs used for upstream and downstream signals, in a wavelength multiplexing optical communication system which performs single-core bidirectional transmission of a plurality of upstream and downstream signals, in such a way that the maximum value of the chromatic dispersion delay amount calculated from each wavelength pair is less than the maximum value of the chromatic dispersion delay amounts calculated when the combinations of wavelength pairs used for upstream and downstream signals are both allocated from the short wave side.Type: ApplicationFiled: January 6, 2016Publication date: December 6, 2018Inventors: Katsuhisa Taguchi, Tomoaki Yoshida, Kota Asaka, Shunji Kimura
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Patent number: 10009137Abstract: An optical communication system of the present invention switches a communication wavelength from a current communication wavelength to a auxiliary communication wavelength when an abnormality occurs in a communication wavelength between a station-side device and any one of a plurality of subscriber devices. Further, this optical communication system switches a communication wavelength used for communication between the subscriber device and the station-side device that perform communication using the auxiliary communication wavelength from the auxiliary communication wavelength back to the current communication wavelength when communication is recovered from an abnormality in the current communication wavelength.Type: GrantFiled: July 23, 2015Date of Patent: June 26, 2018Assignee: Nippon Telegraph And Telephone CorporationInventors: Tomoaki Yoshida, Shin Kaneko, Shunji Kimura
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Publication number: 20180145788Abstract: A station-side device performs transmission and reception of an optical signal to and from a subscriber-side device, and includes a communication control unit configured to perform optical signal communication using a plurality of wavelengths by wavelength division multiplexing and time division multiplexing; and a registration unit configured to set an acceptance period in at least one wavelength among the plurality of wavelengths, to perform a new registration of a subscriber-side device in response to a registration request of the subscriber-side device received within the acceptance period, and not to set the acceptance period in at least one other wavelength among the plurality of wavelengths.Type: ApplicationFiled: May 24, 2016Publication date: May 24, 2018Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tomoaki YOSHIDA, Shigeru KUWANO
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Publication number: 20180131461Abstract: In a case where a wavelength to be assigned to a subscriber-side device, to which a downstream wavelength has been assigned, is to be changed from the currently used (Source) downstream wavelength to a different changeover target (Target) downstream wavelength, a downstream wavelength changeover instruction message that indicates the change target wavelength is generated. In a case where a wavelength to be assigned to the subscriber-side device, to which an upstream wavelength has been assigned, is to be changed from the currently used (Source) upstream wavelength to a different changeover target (Target) upstream wavelength, an upstream wavelength changeover instruction message that indicates the change target wavelength is generated. The downstream wavelength changeover instruction message and the upstream wavelength changeover instruction message are respectively independently generated, and only the wavelength for which the wavelength changeover instruction message was generated is changed.Type: ApplicationFiled: April 20, 2016Publication date: May 10, 2018Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tomoaki YOSHIDA, Kota ASAKA, Shunji KIMURA
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Publication number: 20180131462Abstract: A station-side device of the present invention includes: a wavelength change instruction unit that issues, to a subscriber-side device, a wavelength change instruction to change a transfer-source wavelength assigned to the subscriber-side device to a transfer-target wavelength different from the transfer-source wavelength; a transfer-source port that transmits and receives an optical signal of the transfer-source wavelength; a transfer-target port that transmits and receives an optical signal of the transfer-target wavelength; a transfer-source port monitoring unit that detects a connection between the transfer-source port and the subscriber-side device; a transfer-target port monitoring unit that detects a connection between the transfer-target port and the subscriber-side device; a transfer-source timer that counts, at the transfer-source port, an elapsed time from a predetermined starting time in response to the wavelength change instruction, and ends the counting of the elapsed time in a case where changeType: ApplicationFiled: April 20, 2016Publication date: May 10, 2018Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventor: Tomoaki YOSHIDA
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Patent number: 9871614Abstract: A transmission start time correction method of a WDM/TDM-PON system includes: a completion instruction procedure in which a station-side subscriber accommodation apparatus issues an instruction using a downstream signal for instructing a subscriber apparatus to perform wavelength switching, the downstream signal including a transmission start time of an upstream signal indicating completion of the wavelength switching of the subscriber apparatus, the upstream signal being transmitted by the subscriber apparatus after the wavelength switching; an instruction completion transmission procedure in which the subscriber apparatus transmits the upstream signal indicating the completion of the wavelength switching at a wavelength after switching at the instructed transmission start time after the wavelength switching is completed in accordance with the instruction; and a transmission start time correction procedure in which the station-side subscriber accommodation apparatus measures a reception time of the upstreamType: GrantFiled: July 17, 2015Date of Patent: January 16, 2018Assignee: Nippon Telegraph And Telephone CorporationInventors: Tomoaki Yoshida, Shin Kaneko, Shunji Kimura
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Patent number: 9816835Abstract: An event information memory stores an occurrence time of an event so as to cause the occurrence time of the event to correspond to each of monitoring targets in which the events occurred (or are scheduled to occur) among a plurality of the monitoring targets. Based on position information for displaying each of a plurality of monitoring targets on a general view, a controller instructs control to draw an event display image on the general view so as to cause the event display image to correspond to the monitoring target in which the event occurred (or scheduled to occur), the monitoring target being stored in the event information memory. The event display image includes: a circular portion indicating a predetermined time in a circumferential direction, an indicator indicating a current hour or minute, and an event occurrence time display portion caused to correspond to the occurrence time of the event.Type: GrantFiled: June 10, 2016Date of Patent: November 14, 2017Assignee: JVC KENWOOD CORPORATIONInventors: Katsunori Tagami, Tomoaki Yoshida, Tomonori Nagahama, Yoshihiko Imano, Takeshi Nishiumi, Ichiro Shishido
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Patent number: 9780867Abstract: In an optical communication abnormality-recovery system and method, when an abnormality occurs in transmission and reception of one wavelength of an optical line terminal of a PON system, an optical network unit that is performing communication at a certain wavelength switches the wavelength for performing the communication to another backup wavelength that is instructed in advance. The optical line terminal also performs switching so that the communication is performed using the same backup wavelength as in the optical network unit.Type: GrantFiled: October 21, 2014Date of Patent: October 3, 2017Assignee: Nippon Telegraph and Telephone CorporationInventors: Tomoaki Yoshida, Shin Kaneko, Shunji Kimura
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Patent number: 9768908Abstract: A protection method wherein an ONU switches a reception wavelength to a backup wavelength so as to be logically connected to a backup OSU designated in advance for each ONU when the ONU detects a failure in an OSU to which the ONU is originally assigned, while the ONU keeps on holding its own connection information with the OLT. In the OLT, a backup OSU for the ONU which is originally assigned to the failed OSU is notified of the information on the ONU when the OLT detects a failure in an OSU. In this way, the ONUs which are originally assigned to the failed OSU resumes communication in a short period.Type: GrantFiled: October 22, 2014Date of Patent: September 19, 2017Assignee: Nippon Telegraph and Telephone CorporationInventors: Shin Kaneko, Tomoaki Yoshida, Shunji Kimura
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Patent number: 9749079Abstract: An ONU requests a bandwidth of an uplink signal, and in accordance with this, an OLT calculates a time when the OLT transmits the uplink signal and a transmission duration time and performs an instruction, and a DBA cycle in which the ONU transmits the uplink signal in accordance with the instruction and a dynamic wavelength allocation cycle in which the OLT instructs wavelength switching, and the ONU switches the wavelength and belongs to a different LC are separated. While the ONU switches the wavelength, the DBA cycles can be performed plural times in the ONU whose wavelength is not switched, the switching of the wavelength is confirmed after the wavelength has been switched, and then DBA operation is performed at the switched wavelength.Type: GrantFiled: December 6, 2013Date of Patent: August 29, 2017Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tomoaki Yoshida, Shinya Tamaki, Shin Kaneko
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Publication number: 20170207875Abstract: An optical communication system of the present invention switches a communication wavelength from a current communication wavelength to a auxiliary communication wavelength when an abnormality occurs in a communication wavelength between a station-side device and any one of a plurality of subscriber devices. Further, this optical communication system switches a communication wavelength used for communication between the subscriber device and the station-side device that perform communication using the auxiliary communication wavelength from the auxiliary communication wavelength back to the current communication wavelength when communication is recovered from an abnormality in the current communication wavelength.Type: ApplicationFiled: July 23, 2015Publication date: July 20, 2017Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tomoaki YOSHIDA, Shin KANEKO, Shunji KIMURA
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Patent number: 9705626Abstract: An ONU requests a bandwidth of an uplink signal, and in accordance with this, an OLT calculates a time when the OLT transmits the uplink signal and a transmission duration time and performs an instruction, and a DBA cycle in which the ONU transmits the uplink signal in accordance with the instruction and a dynamic wavelength allocation cycle in which the OLT instructs wavelength switching, and the ONU switches the wavelength and belongs to a different LC are separated. While the ONU switches the wavelength, the DBA cycles can be performed plural times in the ONU whose wavelength is not switched, the switching of the wavelength is confirmed after the wavelength has been switched, and then DBA operation is performed at the switched wavelength.Type: GrantFiled: December 6, 2013Date of Patent: July 11, 2017Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tomoaki Yoshida, Shinya Tamaki, Shin Kaneko
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Publication number: 20170170923Abstract: A transmission start time correction method of a WDM/TDM-PON system includes: a completion instruction procedure in which a station-side subscriber accommodation apparatus issues an instruction using a downstream signal for instructing a subscriber apparatus to perform wavelength switching, the downstream signal including a transmission start time of an upstream signal indicating completion of the wavelength switching of the subscriber apparatus, the upstream signal being transmitted by the subscriber apparatus after the wavelength switching; an instruction completion transmission procedure in which the subscriber apparatus transmits the upstream signal indicating the completion of the wavelength switching at a wavelength after switching at the instructed transmission start time after the wavelength switching is completed in accordance with the instruction; and a transmission start time correction procedure in which the station-side subscriber accommodation apparatus measures a reception time of the upstreamType: ApplicationFiled: July 17, 2015Publication date: June 15, 2017Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tomoaki YOSHIDA, Shin KANEKO, Shunji KIMURA