Patents by Inventor Hideki Maeda
Hideki Maeda 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: 20170366288Abstract: A framer in a transmission device that allocates time slots of an optical channel to a logical path, divides client signals received via the logical path to the time slots allocated to the logical path, and transmits the client signals by a plurality of optical suhcarriers using optical wavelengths correlated with the time slots includes: a time slot allocating unit configured to perform a process of reducing a transmission band of the logical path when some of the optical wavelengths are unavailable and changing the time slots allocated to the logical path depending on the reduced transmission band to avoid using the time slots corresponding to the unavailable optical wavelengths.Type: ApplicationFiled: November 26, 2015Publication date: December 21, 2017Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Masahiro YOKOTA, Takafumi HAMANO, Takashi KOTANIGAWA, Kaoru ARAI, Kei KITAMURA, Hideki MAEDA, Yoshiaki YAMADA, Takuya OHARA, Kengo SHINTAKU
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Publication number: 20170324472Abstract: A framer in a transmission device allocates plural optical channel time slots to a plurality of logical prioritized paths. It allocates received client signals to the allocated time slots, and transmits the client signals by a plurality of optical subcarriers that use a plurality of optical wavelengths corresponding to the plurality of time slots. The framer includes: a time slot allocation unit that, in a case where an optical wavelength corresponding to a time slot allocated to a logical path having a high transmission priority is not used, allocates at least one of the plurality of time slots to the logical path having the high transmission priority while the time slot corresponding to the unused optical wavelength is avoided, to change the time slot allocated to the logical path having the high transmission priority.Type: ApplicationFiled: November 27, 2015Publication date: November 9, 2017Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kei KITAMURA, Takafumi HAMANO, Takashi KOTANIGAWA, Kaoru ARAI, Masahiro YOKOTA, Hideki MAEDA, Yoshiaki YAMADA, Takuya OHARA, Kengo SHINTAKU
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Publication number: 20170324496Abstract: In the optical transport system a transport frame generator divides a transport frame accommodating plural client signals into plural transmission signals. Subcarrier transmission units convert the signals into optical signals using different optical carriers and transmit the converted optical signals. Subcarrier reception units receive the transmitted optical signals and convert the optical signals into reception signals. A transport frame termination unit combines the reception signals to restore the transport frame. A time-demultiplexing processor time-demultiplexes the restored transport frame to be separated into the client signals. A time slot control unit determines a new time slot allocation when time-multiplexing the client signals in the transport frame and stops supply of electric power to a subcarrier transmission unit and a subcarrier reception unit that transmit and receive an optical signal to which the client signals are not allocated.Type: ApplicationFiled: November 26, 2015Publication date: November 9, 2017Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Yoshiaki YAMADA, Kengo SHINTAKU, Takuya OHARA, Kei KITAMURA, Takashi KOTANIGAWA, Takafumi HAMANO, Kaoru ARAI, Masahiro YOKOTA, Hideki MAEDA
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Publication number: 20170257169Abstract: There is provided a tray which is connected to a plurality of transmitters that multicarrier-transmit a plurality of parallel signals by optical subcarriers. The framer selects time slots to be allocated to a path to be accommodated such that the number of optical subcarriers corresponding to the time slots satisfies a predetermined condition on the basis of empty time slots which are specified by path accommodation information indicating a correspondence between paths allocated to a client signal and time slots in a signal frame and the optical subcarriers corresponding to the empty time slots indicated by time slot information indicating a correspondence between the time slots and the optical subcarriers, and sets the selected time slot in the path accommodation information. The framer sets a client signal to the time slots on the basis of the path accommodation information.Type: ApplicationFiled: November 27, 2015Publication date: September 7, 2017Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kei KITAMURA, Takashi KOTANIGAWA, Takafumi HAMANO, Kaoru ARAI, Masahiro YOKOTA, Hideki MAEDA, Yoshiaki YAMADA, Takuya OHARA, Kengo SHINTAKU
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Publication number: 20140340846Abstract: An electronic apparatus includes: a casing with an air inlet and an air outlet; a plurality of walls that each extend in a direction in which the air inlet is opened, the plurality of walls forming a serpentine ventilation path inside the casing; and an air blower that forms a flow of cooling air, the cooling air flowing from the air inlet to the air outlet through the ventilation path.Type: ApplicationFiled: April 25, 2014Publication date: November 20, 2014Applicant: FUJITSU LIMITEDInventors: RYO KURITA, Hideki Maeda
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Patent number: 8797750Abstract: A first metal sheet and a second metal sheet are arranged opposite a printed circuit board including a second connector that fits into a first connector that is arranged at one end of a cable. A hole section through which the first connector passes is arranged in each of the first metal sheet and the second metal sheet. The first connector fits into the second connector by passing through each of the hole sections of the first metal sheet and the second metal sheet. The first metal sheet and the second metal sheet support a connector case of the first connector, thus improving the load bearing characteristics of the cable connection.Type: GrantFiled: April 12, 2012Date of Patent: August 5, 2014Assignee: Fujitsu LimitedInventors: Hideki Maeda, Akira Shimasaki
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Patent number: 8264850Abstract: An electronic device package includes an electronic device including a plurality of input/output terminals, a wiring board which places the electronic device on a first surface and includes wiring connected to the input/output terminals of the electronic device, and a first connection terminal formed on a second surface of the wiring board and connected to the wiring, wherein the first connection terminal has an uneven contact surface formed to receive solder material placed thereon.Type: GrantFiled: March 30, 2009Date of Patent: September 11, 2012Assignee: Fujitsu LimitedInventors: Tsuyoshi So, Hideki Maeda, Osamu Aizawa, Hideo Kubo
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Publication number: 20120216992Abstract: A dew-condensation detecting apparatus includes a dew-condensation detector provided in a middle of a cold-liquid supply passage. The cold-liquid supply passage supplies a cooling liquid to electronic equipment. The dew-condensation detector detects dew condensation by detecting water droplets due to the dew condensation. A heating part heats the cooling liquid which has exited from the dew-condensation detector.Type: ApplicationFiled: December 20, 2011Publication date: August 30, 2012Applicant: Fujitsu LimitedInventors: Tsuyoshi SO, Hideo KUBO, Yoshinori UZUKA, Hideki MAEDA
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Publication number: 20120195012Abstract: A first metal sheet and a second metal sheet are arranged opposite a printed circuit board including a second connector that fits into a first connector that is arranged at one end of a cable. A hole section through which the first connector passes is arranged in each of the first metal sheet and the second metal sheet. The first connector fits into the second connector by passing through each of the hole sections of the first metal sheet and the second metal sheet. The first metal sheet and the second metal sheet support a connector case of the first connector, thus improving the load bearing characteristics of the cable connection.Type: ApplicationFiled: April 12, 2012Publication date: August 2, 2012Applicant: FUJITSU LIMITEDInventors: Hideki MAEDA, Akira SHIMASAKI
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Patent number: 7792430Abstract: The present invention provides an automatic power restoring method capable of reliably detecting continuity by the dissolution of a line fault, to restore the optical power, even in a structure including an optical amplification medium on an optical transmission path and an optical communication system using the method. To this end, in an optical communication system to which the automatic power restoring method of the invention is applied, a pilot signal having a low transmission rate, a wavelength of which is set based on loss wavelength characteristics obtained by combining loss wavelength characteristics of an optical fiber used for the optical transmission path and loss wavelength characteristics of the optical amplification medium on the optical transmission path, is transmitted and received between an optical transmitting station and an optical receiving station when a line fault occurs, and a detection of continuity is thus performed.Type: GrantFiled: April 21, 2008Date of Patent: September 7, 2010Assignees: Fujitsu Limited, Nippon Telegraph & Telephone CorporationInventors: Hiroyuki Deguchi, Shinichirou Harasawa, Hideki Maeda, Akira Naka, Gentaro Funatsu
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Patent number: 7664392Abstract: The present invention provides an automatic power restoring method capable of reliably detecting continuity by the dissolution of a line fault, to restore the optical power, even in a structure including an optical amplification medium on an optical transmission path and an optical communication system using the method. To this end, in an optical communication system to which the automatic power restoring method of the invention is applied, a pilot signal having a low transmission rate, a wavelength of which is set based on loss wavelength characteristics obtained by combining loss wavelength characteristics of an optical fiber used for the optical transmission path and loss wavelength characteristics of the optical amplification medium on the optical transmission path, is transmitted and received between an optical transmitting station and an optical receiving station when a line fault occurs, and a detection of continuity is thus performed.Type: GrantFiled: April 21, 2008Date of Patent: February 16, 2010Assignees: Fujitsu Limited, Nippon Telegraph and Telephone CorporationInventors: Hiroyuki Deguchi, Shinichirou Harasawa, Hideki Maeda, Akira Naka, Gentaro Funatsu
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Publication number: 20090242258Abstract: An electronic device package includes an electronic device including a plurality of input/output terminals, a wiring board which places the electronic device on a first surface and includes wiring connected to the input/output terminals of the electronic device, and a first connection terminal formed on a second surface of the wiring board and connected to the wiring, wherein the first connection terminal has an uneven contact surface formed to receive solder material placed thereon.Type: ApplicationFiled: March 30, 2009Publication date: October 1, 2009Applicant: FUJITSU LIMITEDInventors: Tsuyoshi So, Hideki Maeda, Osamu Aizawa, Hideo Kubo
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Publication number: 20090175616Abstract: The present invention provides an automatic power restoring method capable of reliably detecting continuity by the dissolution of a line fault, to restore the optical power, even in a structure including an optical amplification medium on an optical transmission path and an optical communication system using the method. To this end, in an optical communication system to which the automatic power restoring method of the invention is applied, a pilot signal having a low transmission rate, a wavelength of which is set based on loss wavelength characteristics obtained by combining loss wavelength characteristics of an optical fiber used for the optical transmission path and loss wavelength characteristics of the optical amplification medium on the optical transmission path, is transmitted and received between an optical transmitting station and an optical receiving station when a line fault occurs, and a detection of continuity is thus performed.Type: ApplicationFiled: April 21, 2008Publication date: July 9, 2009Applicants: Fujitsu Limited, Nippon Telegraph and Telephone CorporationInventors: Hiroyuki Deguchi, Shinichirou Harasawa, Hideki Maeda, Akira Naka, Gentaro Funatsu
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Publication number: 20080317461Abstract: The present invention provides an automatic power restoring method capable of reliably detecting continuity by the dissolution of a line fault, to restore the optical power, even in a structure including an optical amplification medium on an optical transmission path and an optical communication system using the method. To this end, in an optical communication system to which the automatic power restoring method of the invention is applied, a pilot signal having a low transmission rate, a wavelength of which is set based on loss wavelength characteristics obtained by combining loss wavelength characteristics of an optical fiber used for the optical transmission path and loss wavelength characteristics of the optical amplification medium on the optical transmission path, is transmitted and received between an optical transmitting station and an optical receiving station when a line fault occurs, and a detection of continuity is thus performed.Type: ApplicationFiled: April 21, 2008Publication date: December 25, 2008Applicants: Fujitsu Limited, Nippon Telegraph and Telephone CorporationInventors: Hiroyuki Deguchi, Shinichirou Harasawa, Hideki Maeda, Akira Naka, Gentaro Funatsu
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Patent number: 7437069Abstract: The present invention provides an automatic power restoring method capable of reliably detecting continuity by the dissolution of a line fault, to restore the optical power, even in a structure including an optical amplification medium on an optical transmission path and an optical communication system using the method. To this end, in an optical communication system to which the automatic power restoring method of the invention is applied, a pilot signal having a low transmission rate, a wavelength of which is set based on loss wavelength characteristics obtained by combining loss wavelength characteristics of an optical fiber used for the optical transmission path and loss wavelength characteristics of the optical amplification medium on the optical transmission path, is transmitted and received between an optical transmitting station and an optical receiving station when a line fault occurs, and a detection of continuity is thus performed.Type: GrantFiled: March 5, 2004Date of Patent: October 14, 2008Assignee: Fujitsu LimitedInventors: Hiroyuki Deguchi, Shinichirou Harasawa, Hideki Maeda, Akira Naka, Gentaro Funatsu
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Patent number: 7420666Abstract: In a method for performing OTDR measurement in an optical transmission system including a first terminal station and a second terminal station, OTDR signal light is transmitted from an OTDR provided in the first terminal station to the second terminal station, in which the OTDR signal light is Raman amplified by using main signal light of the optical transmission system as pump light.Type: GrantFiled: April 5, 2007Date of Patent: September 2, 2008Assignees: Fujitsu Limited, Nippon Telegraph and Telephone CorporationInventors: Takayuki Maehara, Shinichirou Harasawa, Gentaro Funatsu, Hideki Maeda, Akira Naka
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Patent number: 7302967Abstract: A reverse flow preventing device arranged in a flow path of fluid formed by a fan and an electronic apparatus equipped with the same. The reverse flow preventing device has a frame, a plurality of support shafts arranged about the center of the frame and mounted on the frame, and a plurality of pivotable plate members supported by the support shafts. The plate members can move between the first position (reverse flow preventing position) in which they lie in a substantially single plane and the second position (normal operating position) in which they move. The support shafts and the plate members are arranged substantially concentrically or radially.Type: GrantFiled: January 31, 2006Date of Patent: December 4, 2007Assignee: Fujitsu LimitedInventors: Hideki Maeda, Hikaru Inoue, Akira Shimasaki
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Patent number: 7292540Abstract: A network monitoring and controlling apparatus for monitoring and controlling a transmission network formed by a plurality of transmission apparatus includes: a path information storing unit for storing path information; a quality information periodic collection unit for periodically collecting quality information; a quality deterioration detecting unit for determining whether or not quality of the path is deteriorated; a path via point searching unit searching the path information storing unit and obtaining information on a path via points of the path deteriorated in quality; a path via point quality information collection unit for collecting quality information of channels corresponding to the path via points; and a quality deterioration point identifying unit for determining whether or not a deteriorated path via point is present.Type: GrantFiled: February 24, 2004Date of Patent: November 6, 2007Assignee: Fujitsu LimitedInventors: Toshiyuki Yada, Osamu Kobayashi, Yoshiyasu Sutou, Satoshi Kumano, Hideki Maeda, Tomoko Saruwatari, Takashi Yoshitake
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Publication number: 20070183785Abstract: In a method for performing OTDR measurement in an optical transmission system including a first terminal station and a second terminal station, OTDR signal light is transmitted from an OTDR provided in the first terminal station to the second terminal station, in which the OTDR signal light is Raman amplified by using main signal light of the optical transmission system as pump light.Type: ApplicationFiled: April 5, 2007Publication date: August 9, 2007Applicants: FUJITSU LIMITED, NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Takayuki Maehara, Shinichirou Harasawa, Gentaro Funatsu, Hideki Maeda, Akira Naka
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Patent number: 7222174Abstract: A monitoring control network system has at least two monitoring control devices each having at least one monitored device as a slave configuring a network, and monitoring and controlling the slave monitored device, at least one operation terminal monitoring and controlling the corresponding slave monitored device through the monitoring control device, and at least one monitoring target management server including a storage unit storing monitoring target information representing a couple of information for specifying each of the monitored devices and information for specifying each of the monitoring control devices monitoring and controlling the monitored devices, and a notifying unit accepting an acquisition request of the specifying information of the monitoring control device from the operation terminal, and notifying the operation terminal of the specifying information of the monitoring control device with the designated monitored device set as a monitoring target.Type: GrantFiled: March 5, 2003Date of Patent: May 22, 2007Assignee: Fujitsu LimitedInventors: Satoshi Kumano, Hideki Maeda