Patents by Inventor Wataru Kawasaki
Wataru Kawasaki 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: 20240118636Abstract: An electrophotographic photoreceptor includes a conductive substrate, an undercoat layer disposed on the conductive substrate, having a volume resistivity of 5.0×107 [?m] or more and 5.0×109 [?m] or less, and having a thickness of 20 ?m or more and 40 ?m or less, a charge generation layer disposed on the undercoat layer, and a charge transport layer disposed on the charge generation layer, having a volume resistivity of 1.0×1013 [?m] or more and 5.0×1014 [?m] or less, and having a thickness of 15 ?m or more and 40 ?m or less.Type: ApplicationFiled: January 20, 2023Publication date: April 11, 2024Applicant: FUJIFILM Business Innovation Corp.Inventors: Yuki OYAMADA, Wataru Yamada, Masahiro Iwasaki, Keisuke Kusano, Akihiro Kawasaki
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Publication number: 20240118653Abstract: An image forming apparatus includes an electrophotographic photoreceptor that includes a conductive substrate and a photosensitive layer disposed on the conductive substrate, the electrophotographic photoreceptor having an outermost surface layer that contains a binder resin, a charge-transporting material, and a fluorine-containing resin particle, the fluorine-containing resin particle containing 0 or more and 30 or less carboxy groups per 106 carbon atoms, a charging device that charges the electrophotographic photoreceptor, an electrostatic latent image forming device that forms an electrostatic latent image on the electrophotographic photoreceptor that is charged, a developing device that houses a developer containing a toner and that develops, with the developer, the electrostatic latent image formed on the electrophotographic photoreceptor into a toner image, a transfer device that transfers the toner image onto a transfer-receiving medium, and an optical discharging device that, after the toner image iType: ApplicationFiled: March 9, 2023Publication date: April 11, 2024Applicant: FUJIFILM Business Innovation Corp.Inventors: Keisuke Kusano, Wataru Yamada, Masahiro Iwasaki, Akihiro Kawasaki, Yuki Oyamada
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Patent number: 9755777Abstract: An optical transmitter includes a dummy optical source, a polarized wave beam coupler, and an auto gain control (AGC)-system amplifier. The dummy optical source outputs, out of an optical signal in which an optical path signal and an optical packet signal are mixed, a dummy signal having a wavelength identical to that of the optical packet signal. The polarized wave beam coupler multiplexes the dummy signal with the optical signal so that the dummy signal is orthogonal to the optical signal so as to output an output signal. The AGC-system amplifier inputs the output signal, and amplifies the output signal with a predetermined amplification factor corresponding to a power difference between input power and output power of an optical amplifier.Type: GrantFiled: June 24, 2015Date of Patent: September 5, 2017Assignee: FUJITSU LIMITEDInventors: Koji Bato, Tomoyuki Sakata, Tatsuro Kishida, Koji Matsunaga, Tatsuya Toyozumi, Yuichiro Sakane, Wataru Kawasaki
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Patent number: 9720641Abstract: A music distribution server according to an embodiment provides a service in which users can easily enjoy digital contents. The server may include an information storage unit storing various tables and data bases, a playback transmission unit transmitting, in response to playback requests, music data to a terminal device in a streaming method, and a purchase transmission unit transmitting, in response to a purchase request, the music data to the terminal device in a downloading method, a ticket possession status update unit updating a possession status of virtual tickets used for playback of the music data possessed by users, a ticket providing unit providing the virtual tickets to users, a comment management unit managing users' comments on music pieces, a recommendation management unit managing recommendation of music pieces by one user to other users, and a ticket offer management unit offering the virtual tickets from one user to other users.Type: GrantFiled: September 13, 2013Date of Patent: August 1, 2017Inventors: Takayasu Satake, Wataru Kawasaki, Mamoru Yamashiki
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Patent number: 9450698Abstract: The optical transmission device includes an N×N optical switch, an optical packet receiver and an optical packet generation unit. The N×N optical switch transmits data in which a plurality of optical signals each having a different wavelength is multiplexed. The optical packet receiver detects change in the number of wavelengths of optical signals constituting the data. The optical packet generation unit generates, when the change is detected by the optical packet receiver, data to be transmitted by the N×N optical switch, using optical signals for the number of wavelengths after the change.Type: GrantFiled: June 3, 2014Date of Patent: September 20, 2016Assignee: FUJITSU LIMITEDInventors: Koji Matsunaga, Tatsuya Toyozumi, Yasuo Tanaka, Yuichiro Sakane, Koji Bato, Wataru Kawasaki, Tatsuhiko Saito
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Patent number: 9270382Abstract: An optical communication apparatus includes a variable resistor unit, a measurement unit, and a control unit. The variable resistor unit is arranged at a pre-stage of an electrical/optical conversion unit, which converts an electrical signal obtained by converting an input packet to an optical signal having a waveform corresponding to a potential difference between a positive phase component and a negative phase component of the electrical signal by using the potential difference. The variable resistor unit provides a resistor that varies a midpoint of potential of the positive phase component or the negative phase component. The measurement unit measures a ratio of a presence period, which is a period where the input packet is present, to a sum of the presence period and a non-presence period. The control unit controls a value of the resistor provided to the positive phase component or the negative phase component based on the ratio.Type: GrantFiled: June 3, 2014Date of Patent: February 23, 2016Assignee: FUJITSU LIMITEDInventors: Yuichiro Sakane, Koji Matsunaga, Yasuo Tanaka, Tatsuya Toyozumi, Koji Bato, Wataru Kawasaki, Tatsuhiko Saito
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Publication number: 20160020866Abstract: An optical transmitter includes a dummy optical source, a polarized wave beam coupler, and an auto gain control (AGC)-system amplifier. The dummy optical source outputs, out of an optical signal in which an optical path signal and an optical packet signal are mixed, a dummy signal having a wavelength identical to that of the optical packet signal. The polarized wave beam coupler multiplexes the dummy signal with the optical signal so that the dummy signal is orthogonal to the optical signal so as to output an output signal. The AGC-system amplifier inputs the output signal, and amplifies the output signal with a predetermined amplification factor corresponding to a power difference between input power and output power of an optical amplifier.Type: ApplicationFiled: June 24, 2015Publication date: January 21, 2016Applicants: FUJITSU LIMITED, FUJITSU TELECOM NETWORKS LIMITEDInventors: Koji BATO, TOMOYUKI SAKATA, Tatsuro Kishida, Koji Matsunaga, Tatsuya Toyozumi, Yuichiro Sakane, Wataru Kawasaki
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Publication number: 20150363158Abstract: A music distribution server according to an embodiment provides a service in which users can easily enjoy digital contents. The server may include an information storage unit storing various tables and data bases, a playback transmission unit transmitting, in response to playback requests, music data to a terminal device in a streaming method, and a purchase transmission unit transmitting, in response to a purchase request, the music data to the terminal device in a downloading method, a ticket possession status update unit updating a possession status of virtual tickets used for playback of the music data possessed by users, a ticket providing unit providing the virtual tickets to users, a comment management unit managing users' comments on music pieces, a recommendation management unit managing recommendation of music pieces by one user to other users, and a ticket offer management unit offering the virtual tickets from one user to other users.Type: ApplicationFiled: September 13, 2013Publication date: December 17, 2015Inventors: Takayasu SATAKE, Wataru KAWASAKI, Mamoru YAMASHIKI
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Patent number: 9112637Abstract: An optical transmission device that receives a wavelength division multiplexed optical signal obtained by dividing an optical packet signal and performing wavelength multiplexing and that transmits via an optical switch the received wavelength division multiplexed optical signal includes an optical power level measurement unit configured to measure respective optical power levels of respective optical signals of wavelengths included in the wavelength division multiplexed optical signal, and a routing information determinator configured to determine routing information of the wavelength division multiplexed optical signal on the basis of the measured optical power levels.Type: GrantFiled: October 11, 2013Date of Patent: August 18, 2015Assignees: FUJITSU LIMITED, FUJITSU TELECOM NETWORKS LIMITEDInventors: Yuichiro Sakane, Koji Bato, Tatsuya Toyozumi, Koji Matsunaga, Wataru Kawasaki, Tatsuhiko Saito
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Publication number: 20140355980Abstract: An optical communication apparatus includes a variable resistor unit, a measurement unit, and a control unit. The variable resistor unit is arranged at a pre-stage of an electrical/optical conversion unit, which converts an electrical signal obtained by converting an input packet to an optical signal having a waveform corresponding to a potential difference between a positive phase component and a negative phase component of the electrical signal by using the potential difference. The variable resistor unit provides a resistor that varies a midpoint of potential of the positive phase component or the negative phase component. The measurement unit measures a ratio of a presence period, which is a period where the input packet is present, to a sum of the presence period and a non-presence period. The control unit controls a value of the resistor provided to the positive phase component or the negative phase component based on the ratio.Type: ApplicationFiled: June 3, 2014Publication date: December 4, 2014Applicants: FUJITSU LIMITED, FUJITSU TELECOM NETWORKS LIMITEDInventors: Yuichiro Sakane, Koji Matsunaga, Yasuo Tanaka, Tatsuya Toyozumi, Koji Bato, Wataru Kawasaki, Tatsuhiko Saito
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Publication number: 20140355978Abstract: An optical transmission system includes a transmission side optical transmission apparatus having a transmitting unit configured to transmit optical signals of a predetermined number of differing wavelengths, and a processor configured to apply to the optical signals transmitted from the transmitting unit, a predetermined offset related to a tilt; and a reception side optical transmission apparatus having a receiving unit configured to receive the optical signals transmitted from the transmitting unit, a measuring unit configured to measure an optical signal count of the optical signals receivable by the receiving unit, and a notifying unit configured to give notification of the optical signal count measured by the measuring unit. The processor adjusts the offset in an increasing direction when the optical signal count notified by the notifying unit increases, and adjusts the offset in a decreasing direction when the optical signal count notified by the notifying unit decreases.Type: ApplicationFiled: May 27, 2014Publication date: December 4, 2014Applicants: FUJITSU LIMITED, FUJITSU TELECOM NETWORKS LIMITEDInventors: TOMOYUKI SAKATA, Koji BATO, Tatsuro Kishida, Wataru Kawasaki, Tatsuhiko Saito
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Publication number: 20140355976Abstract: The optical transmission device includes an N×N optical switch, an optical packet receiver and an optical packet generation unit. The N×N optical switch transmits data in which a plurality of optical signals each having a different wavelength is multiplexed. The optical packet receiver detects change in the number of wavelengths of optical signals constituting the data. The optical packet generation unit generates, when the change is detected by the optical packet receiver, data to be transmitted by the N×N optical switch, using optical signals for the number of wavelengths after the change.Type: ApplicationFiled: June 3, 2014Publication date: December 4, 2014Applicants: FUJITSU LIMITED, FUJITSU TELECOM NETWORKS LIMITEDInventors: Koji Matsunaga, Tatsuya Toyozumi, Yasuo Tanaka, Yuichiro Sakane, Koji Bato, Wataru Kawasaki, Tatsuhiko Saito
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Patent number: 8897638Abstract: An optical packet switching apparatus includes an optical packet switching apparatus, an optical transmitting apparatus, and an optical packet receiving apparatus. The optical packet transmitting apparatus includes a packet generator for generating a packet signal by adding the routing information to a received client signal, a BIP adding unit for adding BIP to the generated packet signal, and an electrical-to-optical converter for converting the packet signal, to which the BIP has been added, into an optical packet signal so as to be sent out. The optical packet receiving apparatus includes an electrical-to-optical converter for converting the received optical packet signal into an electrical packet signal, and a BIP comparison unit for detecting the error occurrence in the packet signal, based on the BIP added to the packet signal.Type: GrantFiled: April 24, 2012Date of Patent: November 25, 2014Assignee: Fujitsu Telecom Networks LimitedInventors: Koshi Kitajima, Satoshi Fukutomi, Wataru Kawasaki
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Patent number: 8891966Abstract: An optical packet switching device causes branching of an optical packet that is input to an optical switch and detects a synchronization pattern having a predetermined number of bits from the branched optical packet. Then, the optical packet switching device calculates a synchronization point indicating a location of the synchronization pattern with respect to a detection timing and controls, in accordance with the calculated synchronization point, a delay amount of a delay element that delays an optical packet ON signal that is output to the optical switch.Type: GrantFiled: April 17, 2012Date of Patent: November 18, 2014Assignees: Fujitsu Limited, Fujitsu Telecom Networks LimitedInventors: Tatsuya Toyozumi, Koji Matsunaga, Yasuo Tanaka, Hironobu Fukuura, Wataru Kawasaki, Shota Mori
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Patent number: 8755374Abstract: An optical packet switch device includes an optical switch control section and an optical switch section. The optical switch control section includes a synchronization pattern detecting unit which detects a frame synchronization pattern from a parallel data signal and detects a delay bit number showing that the frame synchronization pattern is stored at a position shifted by how many bits from the first bit of the parallel data signal, a header analysis unit which analyzes a header and detects an optical packet length and route information of an optical packet signal, and an output competition determining unit which determines passing/discarding of the optical packet signals competing with each other based on the optical packet length and the route information detected by the header analysis unit and delay bit number information detected by the synchronization pattern detecting unit.Type: GrantFiled: December 27, 2011Date of Patent: June 17, 2014Assignee: Fujitsu Telecom Networks LimitedInventors: Shota Mori, Wataru Kawasaki
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Patent number: 8718470Abstract: An optical packet switching apparatus includes an optical coupler for branching off a received optical packet signal, an optical switch unit for switching the route of one of the branched-off optical packet signals so as to be outputted, and an optical switch control unit for controlling the optical switch unit. The optical switch control unit includes an optical-to-electrical conversion unit for converting the other of the branched-off optical packet signals into an electrical packet signal, a serial/parallel conversion unit capacitively coupled to the optical-to-electrical conversion unit, a packet density detector for detecting the packet density of the received packet signal, and a DC offset adjustment unit for adjusting the DC offset voltage of the packet signal, inputted to the serial/parallel conversion unit, according to the packet density information detected by the packet density detector.Type: GrantFiled: June 20, 2012Date of Patent: May 6, 2014Assignee: Fujitsu Telecom Networks LimitedInventor: Wataru Kawasaki
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Publication number: 20140112661Abstract: An optical transmission device that receives a wavelength division multiplexed optical signal obtained by dividing an optical packet signal and performing wavelength multiplexing and that transmits via an optical switch the received wavelength division multiplexed optical signal includes an optical power level measurement unit configured to measure respective optical power levels of respective optical signals of wavelengths included in the wavelength division multiplexed optical signal, and a routing information determinator configured to determine routing information of the wavelength division multiplexed optical signal on the basis of the measured optical power levels.Type: ApplicationFiled: October 11, 2013Publication date: April 24, 2014Applicants: FUJITSU TELECOM NETWORKS LIMITED, FUJITSU LIMITEDInventors: Yuichiro Sakane, Koji BATO, Tatsuya Toyozumi, KOJI MATSUNAGA, WATARU KAWASAKI, TATSUHIKO SAITO
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Patent number: 8630541Abstract: Provided is a wavelength division multiplexing transmission apparatus that enables operation control of transponders each carrying an FBTL optical module from the monitoring control unit by the same operation control as one for the transponders each carrying an NB optical module with four wavelengths assigned. For that purpose, the wavelength division multiplexing transmission apparatus includes the transponders for converting optical signals from wideband wavelengths to narrowband wavelengths, and a monitoring control unit for controlling the transponders by instructions from an operator.Type: GrantFiled: December 18, 2008Date of Patent: January 14, 2014Assignee: Fujitsu Telecom Networks LimitedInventor: Wataru Kawasaki
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Patent number: 8542996Abstract: An optical packet switching apparatus includes an optical coupler, an optical switch unit, and an optical switch control unit. The optical switch control unit includes an optical-to-electrical converter, a serial/parallel converter, an arrangement detector, a rearrangement unit, a frame synchronization unit, a route detector, a control signal generator, and an adjustment unit for adjusting the timing with which to output an optical switch control signal to the optical switch unit, based on arrangement information on a frame synchronization pattern fed from the arrangement detector.Type: GrantFiled: March 7, 2011Date of Patent: September 24, 2013Assignee: Fujitsu Telecom Networks LimitedInventors: Wataru Kawasaki, Shota Mori
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Publication number: 20120328284Abstract: An optical packet switching apparatus includes an optical coupler for branching off a received optical packet signal, an optical switch unit for switching the route of one of the branched-off optical packet signals so as to be outputted, and an optical switch control unit for controlling the optical switch unit. The optical switch control unit includes an optical-to-electrical conversion unit for converting the other of the branched-off optical packet signals into an electrical packet signal, a serial/parallel conversion unit capacitively coupled to the optical-to-electrical conversion unit, a packet density detector for detecting the packet density of the received packet signal, and a DC offset adjustment unit for adjusting the DC offset voltage of the packet signal, inputted to the serial/parallel conversion unit, according to the packet density information detected by the packet density detector.Type: ApplicationFiled: June 20, 2012Publication date: December 27, 2012Inventor: Wataru Kawasaki