Patents by Inventor Takashi Nishitani
Takashi Nishitani 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: 11075085Abstract: A wafer polishing method of applying mirror polishing to a surface of a wafer using a wafer polishing apparatus provided with a multi-zone pressurizing polishing head having a wafer pressing surface divided into a plurality of pressure zones and capable of performing pressurizing control independently for each pressure zone is provided with a measurement step of measuring a nanotopography map on the wafer surface; and a polishing step of performing the polishing by setting the polishing pressure of the polishing head against the wafer for each pressure zone based on a result of the measurement of the nanotopography map.Type: GrantFiled: November 4, 2016Date of Patent: July 27, 2021Assignee: SUMCO CORPORATIONInventors: Takashi Nishitani, Ryuichi Tanimoto
-
Patent number: 10924373Abstract: An optical line terminal (OLT) for an optical network configured to communicate with optical network units (ONUs) in a PON-type optical network, the OLT including: a processing circuitry, for each ONUs, to manage a transmission delay time in transmission to the ONU to manage an acceptable waiting time of uplink data of the ONU; to obtain an uplink transmission start time and data amount of the optical network unit, based on uplink assignment information; and to generate uplink transmission grant information, which is made up of a time point and time length of uplink transmission to the ONU, wherein the processing circuitry determines the uplink transmission grant information on transmission to the ONU, based on a transmission delay time of the ONU, on the uplink transmission start time and data amount of the ONU, and on the acceptable waiting time of uplink data of the ONU.Type: GrantFiled: July 25, 2016Date of Patent: February 16, 2021Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Yukio Hirano, Kenichi Nakura, Takashi Nishitani
-
Patent number: 10819436Abstract: A base station apparatus includes a ground station device and a plurality of ground antenna devices coupled to the ground station device via an optical transmission path. The ground station device performs electrical-optical conversion on an analog electrical signal to be transmitted to a mobile station and a reference clock signal to generate optical signals, performs wavelength division multiplexing on the obtained optical signals to generate a multiplexed optical signal, and outputs the multiplexed optical signal to the optical transmission path.Type: GrantFiled: May 23, 2017Date of Patent: October 27, 2020Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Hiroshi Nishimoto, Eisuke Haraguchi, Takashi Nishitani
-
Publication number: 20200258735Abstract: A wafer polishing method according to the present invention is provided with: a first polishing step (step S1) of polishing a wafer using a polishing head of an independent pressurizing system having a retainer ring capable of performing pressing operation independently of a wafer pressurizing mechanism; and a second polishing step (step S3) of polishing the wafer that has been polished in the first polishing step using a polishing head of a fixed pressurizing system having a retainer ring fixed to the wafer pressurizing mechanism.Type: ApplicationFiled: November 4, 2016Publication date: August 13, 2020Applicant: SUMCO CORPORATIONInventors: Takashi NISHITANI, Ryuichi TANIMOTO, Ryoya TERAKAWA
-
Publication number: 20200112372Abstract: A base station apparatus includes a ground station device and a plurality of ground antenna devices coupled to the ground station device via an optical transmission path. The ground station device performs electrical-optical conversion on an analog electrical signal to be transmitted to a mobile station and a reference clock signal to generate optical signals, performs wavelength division multiplexing on the obtained optical signals to generate a multiplexed optical signal, and outputs the multiplexed optical signal to the optical transmission path.Type: ApplicationFiled: May 23, 2017Publication date: April 9, 2020Applicant: Mitsubishi Electric CorporationInventors: Hiroshi NISHIMOTO, Eisuke HARAGUCHI, Takashi NISHITANI
-
Patent number: 10525392Abstract: A filtration material of the present invention comprises a bulky fiber sheet layer having a thickness of 0.5 mm or more, and a triboelectrically-charged nonwoven fabric layer in which two or more types of fibers different in constituent resin are mixed, wherein constituent fibers of the triboelectrically-charged nonwoven fabric layer penetrate into the bulky fiber sheet layer. A three-layer filtration material of the present invention comprises bulky fiber sheet layers having a thickness of 0.5 mm or more, and a triboelectrically-charged nonwoven fabric layer, which is located between the bulky fiber sheet layers, wherein the constituent fibers of the triboelectrically-charged nonwoven fabric layer penetrate into the bulky fiber sheet layers, and both bulky fiber sheet layers contain fibers having a limiting oxygen index of 20 or more, and have a mass per unit area 0.5 times or more than that of the triboelectrically-charged nonwoven fabric layer.Type: GrantFiled: July 22, 2015Date of Patent: January 7, 2020Assignee: JAPAN VILENE COMPANY, LTD.Inventors: Satoru Kobori, Naoki Matsuda, Takashi Nishitani
-
Publication number: 20190333775Abstract: A wafer polishing method of applying mirror polishing to a surface of a wafer using a wafer polishing apparatus provided with a multi-zone pressurizing polishing head having a wafer pressing surface divided into a plurality of pressure zones and capable of performing pressurizing control independently for each pressure zone is provided with a measurement step of measuring a nanotopography map on the wafer surface; and a polishing step of performing the polishing by setting the polishing pressure of the polishing head against the wafer for each pressure zone based on a result of the measurement of the nanotopography map.Type: ApplicationFiled: November 4, 2016Publication date: October 31, 2019Applicant: SUMCO CORPORATIONInventors: Takashi NISHITANI, Ryuichi TANIMOTO
-
Publication number: 20190319866Abstract: An optical line terminal (OLT) for an optical network configured to communicate with optical network units (ONUs) in a PON-type optical network, the OLT including: a processing circuitry, for each ONUs, to manage a transmission delay time in transmission to the ONU to manage an acceptable waiting time of uplink data of the ONU; to obtain an uplink transmission start time and data amount of the optical network unit, based on uplink assignment information; and to generate uplink transmission grant information, which is made up of a time point and time length of uplink transmission to the ONU, wherein the processing circuitry determines the uplink transmission grant information on transmission to the ONU, based on a transmission delay time of the ONU, on the uplink transmission start time and data amount of the ONU, and on the acceptable waiting time of uplink data of the ONU.Type: ApplicationFiled: July 25, 2016Publication date: October 17, 2019Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Yukio HIRANO, Kenichi NAKURA, Takashi NISHITANI
-
Patent number: 9906403Abstract: An ONU receiving an optical signal from an OLT including PON controllers includes: an optical receiver to convert, into an electric signal, an optical signal having a single optical wavelength set out of plural optical wavelengths; and a control frame extractor to extract and hold wavelength correspondence information indicating correspondence between MAC addresses of the PON controllers received from the OLT and the optical wavelengths.Type: GrantFiled: August 26, 2014Date of Patent: February 27, 2018Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Hiroaki Mukai, Takashi Nishitani
-
Publication number: 20170279665Abstract: An ONU receiving an optical signal from an OLT including PON controllers includes: an optical receiver to convert, into an electric signal, an optical signal having a single optical wavelength set out of plural optical wavelengths; and a control frame extractor to extract and hold wavelength correspondence information indicating correspondence between MAC addresses of the PON controllers received from the OLT and the optical wavelengths.Type: ApplicationFiled: August 26, 2014Publication date: September 28, 2017Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Hiroaki MUKAI, Takashi NISHITANI
-
Patent number: 9768862Abstract: An ONU communicates with an OLT that can transmit optical signals having different wavelengths simultaneously and receive optical signals having different wavelengths simultaneously. The ONU includes: an optical transceiver that receives any one of the optical signals that the OLT can transmit and transmits any one of the optical signals that the OLT can receive; a communication failure detection unit that detects a communication failure between the OLT and the ONU; and a wavelength selection unit that, when the communication failure detection unit detects a communication failure, changes a setting of a downstream wavelength to be received by the optical transceiver and an upstream wavelength to be transmitted by the optical transceiver.Type: GrantFiled: November 1, 2013Date of Patent: September 19, 2017Assignee: Mitsubishi Electric CorporationInventors: Hiroaki Mukai, Takashi Nishitani
-
Publication number: 20170216750Abstract: A filtration material of the present invention comprises a bulky fiber sheet layer having a thickness of 0.5 mm or more, and a triboelectrically-charged nonwoven fabric layer in which two or more types of fibers different in constituent resin are mixed, wherein constituent fibers of the triboelectrically-charged nonwoven fabric layer penetrate into the bulky fiber sheet layer. A three-layer filtration material of the present invention comprises bulky fiber sheet layers having a thickness of 0.5 mm or more, and a triboelectrically-charged nonwoven fabric layer, which is located between the bulky fiber sheet layers, wherein the constituent fibers of the triboelectrically-charged nonwoven fabric layer penetrate into the bulky fiber sheet layers, and both bulky fiber sheet layers contain fibers having a limiting oxygen index of 20 or more, and have a mass per unit area 0.5 times or more than that of the triboelectrically-charged nonwoven fabric layer.Type: ApplicationFiled: July 22, 2015Publication date: August 3, 2017Applicant: Japan Vilene Company, Ltd.Inventors: Satoru KOBORI, Naoki MATSUDA, Takashi NISHITANI
-
Patent number: 9698899Abstract: An ONU communicates with an OLT that can transmit optical signals having different wavelengths simultaneously and receive optical signals having different wavelengths simultaneously. The ONU includes: an optical transceiver that receives any one of the optical signals that the OLT can transmit and transmits any one of the optical signals that the OLT can receive; a communication failure detection unit that detects a communication failure between the OLT and the ONU; and a wavelength selection unit that, when the communication failure detection unit detects a communication failure, changes a setting of a downstream wavelength to be received by the optical transceiver and an upstream wavelength to be transmitted by the optical transceiver.Type: GrantFiled: November 1, 2013Date of Patent: July 4, 2017Assignee: Mitsubishi Electric CorporationInventors: Hiroaki Mukai, Takashi Nishitani
-
Publication number: 20160261337Abstract: An ONU communicates with an OLT that can transmit optical signals having different wavelengths simultaneously and receive optical signals having different wavelengths simultaneously. The ONU includes: an optical transceiver that receives any one of the optical signals that the OLT can transmit and transmits any one of the optical signals that the OLT can receive; a communication failure detection unit that detects a communication failure between the OLT and the ONU; and a wavelength selection unit that, when the communication failure detection unit detects a communication failure, changes a setting of a downstream wavelength to be received by the optical transceiver and an upstream wavelength to be transmitted by the optical transceiver.Type: ApplicationFiled: November 1, 2013Publication date: September 8, 2016Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Hiroaki MUKAI, Takashi NISHITANI
-
Publication number: 20160080208Abstract: Included are a report-frame analysis unit that extracts a requested bandwidth from a report frame; an upload-bandwidth calculation unit that calculates the upload bandwidth; a residual-time calculation unit that acquires the residual time of each LLID before an allowable delay time; a priority calculation unit that acquires a priority of a data request corresponding to the report frame on the basis of the residual time; a report-request registration unit that generates a report request requesting allocation of an upload bandwidth for a report frame and that decides the priority of the report request; an allocation-order reading unit that decides the allocation order for the data request and the report request on the basis of the priority; and a gate-frame creation unit that decides a transmission-permitted time slot for each LLID on the basis of the allocation order and the upload bandwidth and that creates a gate frame.Type: ApplicationFiled: April 28, 2014Publication date: March 17, 2016Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Yuta TAKEMOTO, Takashi NISHITANI
-
Patent number: 8879912Abstract: A bandwidth control method used in a case where, for example, a first communication device (OLT) allocates a bandwidth for signal transmission to each of a plurality of second communication devices (ONUs) connected to the OLT in a communication system having the OLT and the ONUs includes a sleep controlling of shifting devices among the ONUs that satisfy a predetermined condition into a power saving state, a control-target selecting of selecting control target devices among the ONUs based on a result of performing the sleep controlling, and a bandwidth determining of determining a bandwidth to be allocated to the selected control target devices.Type: GrantFiled: January 28, 2010Date of Patent: November 4, 2014Assignee: Mitsubishi Electric CorporationInventors: Seiji Kozaki, Takashi Nishitani, Masaki Tanaka
-
Patent number: 8767745Abstract: A communication device operating as a master unit includes: a MAC layer termination functioning unit for extracting, from a receiving signal, queue length information scheduled to be transmitted from an ONU, and controlling transmission of a grant to the ONU; a traffic monitor for measuring an amount of uplink traffic of each ONU; and a bandwidth allocation functioning unit for determining a bandwidth to be allocated to each ONU based on the queue length information extracted by the MAC layer termination functioning unit, the amount of traffic measured by the traffic monitor, and a bandwidth that can be allocated in one cycle of bandwidth update, and issuing a grant according to the determination. The bandwidth allocation functioning unit updates a bandwidth to be allocated periodically.Type: GrantFiled: February 23, 2009Date of Patent: July 1, 2014Assignee: Mitsubishi Electric CorporationInventors: Takashi Nishitani, Hiroaki Mukai, Masaki Tanaka
-
Patent number: 8562895Abstract: A process of manufacturing inorganic nanofibers, without using an organic polymer, using a highly reactive metal alkoxide such as titanium alkoxide or zirconium alkoxide, in particular, a process in which inorganic nanofibers can be stably produced over a long period, is provided. It is a process of manufacturing inorganic nanofibers by electrospinning using a sol solution containing an inorganic component as a main component, characterized in that the sol solution contains a metal alkoxide having a high reactivity and a salt catalyst, and that the salt catalyst is an amine compound having an N—N bond, an N—O bond, an N—C?N bond, or an N—C?S bond.Type: GrantFiled: December 23, 2009Date of Patent: October 22, 2013Assignees: Shinshu University, Japan Vilene Company, Ltd.Inventors: Yasushi Murakami, Hisanao Usami, Tomohiro Nishikawa, Takashi Tarao, Rie Watanabe, Masaaki Kawabe, Takashi Nishitani
-
Publication number: 20130236170Abstract: The present invention provides a communication apparatus on a subscriber side that, in a point to multi-point communication system, transmits upstream data transmitted from a lower-level device to a station-side device based on a data transmission start time and a transmission duration time notified from the station-side device. The communication apparatus includes a logical-link control unit that determines number of links to be used, which is number of logical links to be used for an upstream data transmission in a next bandwidth update cycle, based on an accumulated data amount in an upstream buffer unit that accumulates upstream data to be transmitted to the station-side device.Type: ApplicationFiled: November 24, 2010Publication date: September 12, 2013Applicant: Mitsubishi Electric CorporationInventors: Takashi Nishitani, Akihiro Tsuji
-
Publication number: 20120301145Abstract: A bandwidth control method used in a case where, for example, a first communication device (OLT) allocates a bandwidth for signal transmission to each of a plurality of second communication devices (ONUs) connected to the OLT in a communication system having the OLT and the ONUs includes a sleep controlling of shifting devices among the ONUs that satisfy a predetermined condition into a power saving state, a control-target selecting of selecting control target devices among the ONUs based on a result of performing the sleep controlling, and a bandwidth determining of determining a bandwidth to be allocated to the selected control target devices.Type: ApplicationFiled: January 28, 2010Publication date: November 29, 2012Applicant: Mitsubishi Electric CorporationInventors: Seiji Kozaki, Takashi Nishitani, Masaki Tanaka