Patents by Inventor Takeru Chiba

Takeru Chiba 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: 11365631
    Abstract: A turbine rotor blade according to at least one embodiment to be connected to a rotational shaft so as to be rotatable around an axis includes a hub having a hub surface inclined with respect to the axis in a cross-section along the axis; and a plurality of rotor blades disposed on the hub surface. In a throat portion where a blade-to-blade distance between two adjacent rotor blades is smallest, a value (Lt/r) obtained by dividing the blade-to-blade Lt at a given radial position by a distance r from the axis to the radial position is maximum at a position where a dimensionless span length is in a range of 0.2 to 0.65, assuming that the dimensionless span length is 0 at a position of a root end portion on a hub side and is 1 at a position of a tip end portion opposite to the hub side.
    Type: Grant
    Filed: November 29, 2018
    Date of Patent: June 21, 2022
    Assignee: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.
    Inventors: Takeru Chiba, Toru Hoshi
  • Patent number: 11321208
    Abstract: A distributed storage system, which receives a write request from a client, includes a plurality of computers which receive power supply from a plurality of power supply units. A first computer, among the plurality of computers, which is a computer that receives the write request from the client, is configured to: cache updated data which is at least apart of data accompanying the write request; select n second computers which are n computers (n is a natural number) among computers each receiving power from a power supply unit different from a power supply unit of the first computer as transfer destinations of the updated data; and transfer the updated data to the selected n second computers, respectively. At least one of the n second computers, when caching the updated data from the first computer, is configured to return a result to the first computer.
    Type: Grant
    Filed: September 6, 2017
    Date of Patent: May 3, 2022
    Assignee: HITACHI, LTD.
    Inventors: Hiroto Ebara, Mitsuo Hayasaka, Takeru Chiba
  • Patent number: 11301137
    Abstract: An object is to construct a storage system with a configuration with a high degree of freedom while ensuring a certain fault tolerance. The storage system includes a plurality of nodes that process an I/O processing request of data. The node has a storage device and a processor that performs the I/O processing on the storage device. The processor constitutes a data redundancy configuration in which data stored in different storage devices is combined as a data set. A management unit for managing the storage system performs a fault tolerance calculation of calculating fault tolerance information for a failure of each component by using component information that is information of a component including at least the and the storage device, and by using data redundancy configuration information related to the data redundancy configuration, and determines a data arrangement by applying the data redundancy configuration related to the calculated fault tolerance information.
    Type: Grant
    Filed: July 1, 2020
    Date of Patent: April 12, 2022
    Assignee: HITACHI, LTD.
    Inventors: Takeru Chiba, Masakuni Agetsuma, Takahiro Yamamoto, Hiroto Ebara
  • Publication number: 20220066336
    Abstract: The preset invention provides a method for producing a toner for electrostatic-image development comprising: a dispersing step of performing a dispersing treatment in which a cavitation effect is obtained on a color resin particle containing a binder resin, a colorant, a charge control agent, and a release agent in an aqueous dispersion median so as to obtain a dispersion of the color resin particle; and a heating step of performing a heat treatment on the dispersion of the color resin particle at a temperature of equal to or more than a glass transition temperature of the color resin particle and 95° C. or less for a heating time of 5 minutes or more and 10 hours or less.
    Type: Application
    Filed: December 26, 2019
    Publication date: March 3, 2022
    Applicant: ZEON CORPORATION
    Inventors: Kojiro Akazaki, Takeru Chiba, Takashi Iga
  • Publication number: 20220027070
    Abstract: Provided is a storage system and a storage management method, aiming at reducing data movement amount necessary for using an expanded capacity in a distributed RAID. When only A (A is a positive integer) physical storage drives are added, a storage controller selects virtual parcels that are mapped to different physical storage drives among N physical storage drives and are included in different virtual chunks, changes an arrangement of the selected virtual parcels to the added A physical storage drives, and constitutes a new chunk based on unallocated virtual parcels selected from different physical storage drives among the (N+A) physical storage drives.
    Type: Application
    Filed: October 7, 2021
    Publication date: January 27, 2022
    Applicant: HITACHI, LTD.
    Inventors: Hiroki FUJII, Yoshinori OHIRA, Takeru CHIBA, Yoshiaki DEGUCHI
  • Publication number: 20220027239
    Abstract: Provided is a storage system that performs inter-node movement of parity and reconfiguration of a stripe when a node configuration is changed. The storage system includes a plurality of nodes and a management unit, in which the nodes are targets for data write and read requests, form a stripe by a plurality of data stored in different nodes and parity generated based on the plurality of data, and store the parity of the stripe to which the data under the write request belongs in a node different from the plurality of nodes that store the plurality of data so as to perform redundancy; and the management unit transmits, to the node, an arrangement change request to perform the inter-node movement of the parity and the reconfiguration of the stripe when the node configuration is changed.
    Type: Application
    Filed: October 8, 2021
    Publication date: January 27, 2022
    Inventors: Takahiro YAMAMOTO, Hiroto EBARA, Takeru CHIBA, Masakuni AGETSUMA
  • Publication number: 20210382788
    Abstract: A storage system including a storage controller and a plurality of storage drives generates parity data from data. Data and parity data configure a stripe. A plurality of stripes configure a parity group allocated with a plurality of storage drives to store the parity group. A first parity group allows the number of storage drives allocated to the parity group to be equal to the number of data pieces configuring each stripe. A second parity group allows the number of storage drives allocated to the parity group to be larger than the number of data pieces configuring each stripe and allows data for each stripe to be distributed and stored in different combinations of storage drives. When the first parity group is converted to the second parity group, a storage drive is added so that it is allocated to the parity group. Data is moved to ensure a free area.
    Type: Application
    Filed: March 15, 2021
    Publication date: December 9, 2021
    Inventors: Takeru CHIBA, Hiroki FUJII, Yoshiaki DEGUCHI
  • Patent number: 11169879
    Abstract: Provided is a storage system that performs inter-node movement of parity and reconfiguration of a stripe when a node configuration is changed. The storage system includes a plurality of nodes and a management unit, in which the nodes are targets for data write and read requests, form a stripe by a plurality of data stored in different nodes and parity generated based on the plurality of data, and store the parity of the stripe to which the data under the write request belongs in a node different from the plurality of nodes that store the plurality of data so as to perform redundancy; and the management unit transmits, to the node, an arrangement change request to perform the inter-node movement of the parity and the reconfiguration of the stripe when the node configuration is changed.
    Type: Grant
    Filed: August 28, 2019
    Date of Patent: November 9, 2021
    Assignee: HITACHI, LTD.
    Inventors: Takahiro Yamamoto, Hiroto Ebara, Takeru Chiba, Masakuni Agetsuma
  • Patent number: 11150820
    Abstract: Provided is a storage system and a storage management method, aiming at reducing data movement amount necessary for using an expanded capacity in a distributed RAID. When only A (A is a positive integer) physical storage drives are added, a storage controller selects virtual parcels that are mapped to different physical storage drives among N physical storage drives and are included in different virtual chunks, changes an arrangement of the selected virtual parcels to the added A physical storage drives, and constitutes a new chunk based on unallocated virtual parcels selected from different physical storage drives among the (N+A) physical storage drives.
    Type: Grant
    Filed: September 16, 2020
    Date of Patent: October 19, 2021
    Assignee: HITACHI, LTD.
    Inventors: Hiroki Fujii, Yoshinori Ohira, Takeru Chiba, Yoshiaki Deguchi
  • Patent number: 11151045
    Abstract: Provided is a distributed storage system which can reduce a load on a network between storage apparatuses when an access request is received and improve responsiveness. In the distributed storage system, the storage device includes a data area and a cache area; a node becomes an owner node when receiving a transfer of charge of an LU from another node in a non-storage state where LU data is not stored in a data area; the processor of the owner node receives a read request for an LU that is in charge, obtains data of a target area based on data of the storage device of another node when the data of the target area is not stored in the data area or the cache area of the owner node, and transmits the data to a request source and stores it in a cache area.
    Type: Grant
    Filed: September 19, 2019
    Date of Patent: October 19, 2021
    Assignee: HITACHI, LTD.
    Inventors: Yoshinori Ohira, Masakuni Agetsuma, Takeru Chiba, Takahiro Yamamoto, Hiroto Ebara, Hideo Saito
  • Patent number: 11137940
    Abstract: A capacity control module which manages a physical storage area provided by each of storage devices in a cluster by dividing the physical storage area into a physical storage area having a predetermined size, in a plurality of storage nodes configuring a storage system, and, a storage control module which receives an I/O request from a higher-level device are provided, two storage control modules, which are arranged in different storage nodes and configure a redundancy configuration, are managed as a storage control module pair, the capacity control module preferentially allocates each of the physical storage areas in the vicinity of an arrangement destination of each of the storage control modules configuring the storage control module pair, to the storage control module pair, and storage data is read from or is written on the physical storage area, according to a command applied from the storage control module.
    Type: Grant
    Filed: April 8, 2019
    Date of Patent: October 5, 2021
    Assignee: Hitachi, Ltd.
    Inventors: Shintaro Ito, Yuko Matsui, Masakuni Agetsuma, Hideo Saito, Takeru Chiba, Takahiro Yamamoto
  • Patent number: 11112973
    Abstract: A computer system includes a host unit that issues a request of an I/O processing to a volume VOL, a local pool control unit that is in charge of management of a local pool based on a storage area of a drive of one node, and a global pool control unit that is in charge of management of a global pool based on a plurality of local pools, wherein the global pool control unit controls transmission of target data of the I/O processing performed by the host unit based on a commonality relationship among a first node that is formed with the host unit performing the I/O processing, a second node that is formed with the global pool control unit, and a third node that is formed with the local pool control unit managing the local pool.
    Type: Grant
    Filed: September 3, 2019
    Date of Patent: September 7, 2021
    Assignee: HITACHI, LTD.
    Inventors: Hiroto Ebara, Yoshinori Ohira, Hideo Saito, Masakuni Agetsuma, Takeru Chiba, Takahiro Yamamoto
  • Publication number: 20210270182
    Abstract: A variable geometry turbocharger (100) includes a bearing housing (10) including a bearing-housing side support portion (40) configured to support a radially outer portion (38) of a nozzle mount (16) from a side opposite to a scroll flow passage (4) in an axial direction of a turbine rotor (2), and wherein at least one of the following condition (a) or (b) is satisfied: (a) the bearing-housing side support portion (40) includes at least one bearing-housing side recess portion (46) formed so as to be recessed in the axial direction so as not to be in contact with the radially outer portion (38); (b) the radially outer portion (38) of the nozzle mount (16) includes at least one nozzle-mount side recess portion (62) formed so as to be recessed in the axial direction so as not to be in contact with the bearing-housing side support portion (40).
    Type: Application
    Filed: May 5, 2021
    Publication date: September 2, 2021
    Applicant: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.
    Inventors: Keigo SAKAMOTO, Yosuke DAMMOTO, Eigo KATOU, Yoji AKIYAMA, Nariaki SEIKE, Toyotaka YOSHIDA, Takeru CHIBA
  • Publication number: 20210247934
    Abstract: In a storage system including a plurality of nodes that provide a storage area and a drive that physically stores data, a parity group is configured with a plurality of data including user data stored in the storage area and redundant data for protecting the user data, a plurality of data in the parity group are stored in a storage area within one predetermined range across a plurality of nodes, and processing for dividing the predetermined range or processing for merging a plurality of predetermined ranges is performed based on a state of the predetermined range.
    Type: Application
    Filed: September 11, 2020
    Publication date: August 12, 2021
    Applicant: Hitachi, Ltd.
    Inventors: Takahiro Yamamoto, Hiroto Ebara, Takeru Chiba, Yoshinori Ohira, Masakuni Agetsuma, Mikio Fukuoka
  • Publication number: 20210181958
    Abstract: Provided is a storage system and a storage management method, aiming at reducing data movement amount necessary for using an expanded capacity in a distributed RAID. When only A (A is a positive integer) physical storage drives are added, a storage controller selects virtual parcels that are mapped to different physical storage drives among N physical storage drives and are included in different virtual chunks, changes an arrangement of the selected virtual parcels to the added A physical storage drives, and constitutes a new chunk based on unallocated virtual parcels selected from different physical storage drives among the (N+A) physical storage drives.
    Type: Application
    Filed: September 16, 2020
    Publication date: June 17, 2021
    Applicant: HITACHI, LTD.
    Inventors: Hiroki FUJII, Yoshinori OHIRA, Takeru CHIBA, Yoshiaki DEGUCHI
  • Publication number: 20210172320
    Abstract: A turbine rotor blade according to at least one embodiment to be connected to a rotational shaft so as to be rotatable around an axis includes a hub having a hub surface inclined with respect to the axis in a cross-section along the axis; and a plurality of rotor blades disposed on the hub surface. In a throat portion where a blade-to-blade distance between two adjacent rotor blades is smallest, a value (Lt/r) obtained by dividing the blade-to-blade Lt at a given radial position by a distance r from the axis to the radial position is maximum at a position where a dimensionless span length is in a range of 0.2 to 0.65, assuming that the dimensionless span length is 0 at a position of a root end portion on a hub side and is 1 at a position of a tip end portion opposite to the hub side.
    Type: Application
    Filed: November 29, 2018
    Publication date: June 10, 2021
    Applicant: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.
    Inventors: Takeru CHIBA, Toru HOSHI
  • Patent number: 11028767
    Abstract: A variable geometry turbocharger (100) includes a bearing housing (10) including a bearing-housing side support portion (40) configured to support a radially outer portion (38) of a nozzle mount (16) from a side opposite to a scroll flow passage (4) in an axial direction of a turbine rotor (2), and wherein at least one of the following condition (a) or (b) is satisfied: (a) the bearing-housing side support portion (40) includes at least one bearing-housing side recess portion (46) formed so as to be recessed in the axial direction so as not to be in contact with the radially outer portion (38); (b) the radially outer portion (38) of the nozzle mount (16) includes at least one nozzle-mount side recess portion (62) formed so as to be recessed in the axial direction so as not to be in contact with the bearing-housing side support portion (40).
    Type: Grant
    Filed: March 28, 2016
    Date of Patent: June 8, 2021
    Assignee: MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.
    Inventors: Keigo Sakamoto, Yosuke Dammoto, Eigo Katou, Yoji Akiyama, Nariaki Seike, Toyotaka Yoshida, Takeru Chiba
  • Patent number: 10983720
    Abstract: A storage system is configured to include a plurality of storage nodes, and includes a selection unit which selects a storage node required for setting a data protection level after conversion from among the plurality of storage nodes on the basis of information related to the conversion of the data protection level. The storage node selected by the selection unit manages data using the data protection level after conversion.
    Type: Grant
    Filed: September 12, 2019
    Date of Patent: April 20, 2021
    Assignee: HITACHI, LTD.
    Inventors: Masakuni Agetsuma, Takahiro Yamamoto, Hideo Saito, Takaki Nakamura, Takeru Chiba, Hiroto Ebara
  • Patent number: 10901336
    Abstract: Provided is a positively-chargeable toner for developing electrostatic images excellent in printing durability, charge stability, and conveyance amount stability. The toner comprises colored resin particles comprising a binder resin and a colorant, and an external additive, wherein the external additive comprises spherical silica particles with a number average particle diameter of 70 to 200 nm. wherein the external additive has a particle size distribution in which a percentage of a number of particles having a particle diameter of 50 nm or more is 75% or more, which is calculated based on a SEM image.
    Type: Grant
    Filed: February 28, 2018
    Date of Patent: January 26, 2021
    Assignee: ZEON CORPORATION
    Inventors: Sakyo Yagyu, Takeru Chiba
  • Patent number: 10901335
    Abstract: A toner for developing electrostatic images, comprising colored resin particles that contain a binder resin, a colorant and a charge control agent, and external additives, wherein the external additives contain at least an external additive A and an external additive B; wherein the external additive A is metal oxide particles charged to the same polarity as a polarity of the colored resin particles, with a specific charge amount per unit surface area and a specific number average particle diameter; wherein the external additive B is resin particles charged to the opposite polarity to the polarity of the colored resin particles, with a specific number average particle diameter; and wherein a content of the external additive A and a content of the external additive B are in specific ranges.
    Type: Grant
    Filed: September 26, 2018
    Date of Patent: January 26, 2021
    Assignee: ZEON CORPORATION
    Inventor: Takeru Chiba