Patents by Inventor Akio Tatsumi
Akio Tatsumi 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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Patent number: 8792204Abstract: A base plate of a disk drive apparatus includes a motor base disposed around a central axis and a base body portion extending radially outward of the motor base. The motor base is made of a metallic material of a first type. The base body portion is made of a metallic material of a second type. Thus, the axial thickness of a portion of the base plate close to the central axis can be significantly reduced and a reduction in the stiffness of the portion can be prevented. Further, the motor base includes a flange portion and a plastic deforming portion. The flange portion and the plastic deforming portion are respectively in contact with at least a portion of both axial end surfaces of an inner end portion of the base body portion. Thus, extraction of the motor base in the axial direction is prevented.Type: GrantFiled: March 7, 2013Date of Patent: July 29, 2014Assignee: Nidec CorporationInventors: Akio Tatsumi, Takashi Fujiwara, Takayuki Ishino, Kiyofumi Inoue, Akihiro Yudate
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Publication number: 20130335859Abstract: A base plate of a disk drive apparatus includes a motor base disposed around a central axis and a base body portion extending radially outward of the motor base. The motor base is made of a metallic material of a first type. The base body portion is made of a metallic material of a second type. Thus, the axial thickness of a portion of the base plate close to the central axis can be significantly reduced and a reduction in the stiffness of the portion can be prevented. Further, the motor base includes a flange portion and a plastic deforming portion. The flange portion and the plastic deforming portion are respectively in contact with at least a portion of both axial end surfaces of an inner end portion of the base body portion. Thus, extraction of the motor base in the axial direction is prevented.Type: ApplicationFiled: March 7, 2013Publication date: December 19, 2013Applicant: NIDEC CORPORATIONInventors: Akio TATSUMI, Takashi FUJIWARA, Takayuki ISHINO, Kiyofumi INOUE, Akihiro YUDATE
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Patent number: 8567067Abstract: A method of manufacturing a bearing mechanism of a motor includes steps a)-e). In step a), a bearing assembly is assembled. In step b), an upper seal gap between an upper thrust portion and an upper hub annular portion is arranged to face downward to increase the width of a gap between an outer tubular portion and a flange portion, or a lower seal gap between the outer tubular portion and a lower hub annular portion is arranged to face downward to increase the width of a gap between the upper thrust portion and the flange portion. In step c), pressure in all gaps is reduced. In step d), lubricating oil is injected into the upper or lower seal gap which faces upward, and a predetermined time or longer is allowed to pass. In step e), pressure is returned to atmospheric pressure.Type: GrantFiled: January 19, 2012Date of Patent: October 29, 2013Assignee: Nidec CorporationInventors: Katsuki Yamaguchi, Shigeki Horiki, Yoshitsugu Hideshima, Akio Tatsumi, Akinobu Sumiji, Takehito Tamaoka, Kazushi Miura, Mitsuhiro Takemoto
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Publication number: 20120327534Abstract: A method of manufacturing a bearing mechanism of a motor includes steps a)-e). In step a), a bearing assembly is assembled. In step b), an upper seal gap between an upper thrust portion and an upper hub annular portion is arranged to face downward to increase the width of a gap between an outer tubular portion and a flange portion, or a lower seal gap between the outer tubular portion and a lower hub annular portion is arranged to face downward to increase the width of a gap between the upper thrust portion and the flange portion. In step c), pressure in all gaps is reduced. In step d), lubricating oil is injected into the upper or lower seal gap which faces upward, and a predetermined time or longer is allowed to pass. In step e), pressure is returned to atmospheric pressure.Type: ApplicationFiled: January 19, 2012Publication date: December 27, 2012Applicant: NIDEC CORPORATIONInventors: Katsuki YAMAGUCHI, Shigeki HORIKI, Yoshitsugu HIDESHIMA, Akio TATSUMI, Akinobu SUMIJI, Takehito TAMAOKA, Kazushi MIURA, Mitsuhiro TAKEMOTO
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Patent number: 7660918Abstract: In an information processing system including host computers and disk devices, each of an execution-node host and a standby-node host includes an I/O request unit and an access-right change command unit. The I/O request unit issues an I/O request. The access-right change command unit transmits an access-right change command. The access-right change command results from causing I/O-enable/disable information and the host identification information to correspond to each other. The disk device includes an access control table, an access control unit, and an access-right change unit. The access control table stores information of the access-right change commands from the hosts. The access control unit judges the execution enablement/disablement for the I/O requests from the host identification information and the access control table.Type: GrantFiled: February 12, 2009Date of Patent: February 9, 2010Assignee: Hitachi, Ltd.Inventors: Yusuke Ohashi, Toru Horie, Akio Tatsumi
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Publication number: 20090157915Abstract: In an information processing system including host computers and disk devices, each of an execution-node host and a standby-node host includes an I/O request unit and an access-right change command unit. The I/O request unit issues an I/O request. The access-right change command unit transmits an access-right change command. The access-right change command results from causing I/O-enable/disable information and the host identification information to correspond to each other. The disk device includes an access control table, an access control unit, and an access-right change unit. The access control table stores information of the access-right change commands from the hosts. The access control unit judges the execution enablement/disablement for the I/O requests from the host identification information and the access control table.Type: ApplicationFiled: February 12, 2009Publication date: June 18, 2009Inventors: Yusuke OHASHI, Toru Horie, Akio Tatsumi
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Publication number: 20070061613Abstract: A restart method for restarting an operating system in a computer in which a failure has occurred, the restart method includes the steps of, upon occurrence of a failure in an active computer in which an operating system (OS) is in operation, ordering disconnection of an OS storing storage device from the active computer by using a processor, ordering connection of the OS storing storage device to a stand-by computer by using the processor, restarting the operating system in the OS storing storage device by using the stand-by computer, and outputting dump information to a dump information storing storage device, by using the active computer, in parallel with restart of the operating system conducted by the stand-by computer.Type: ApplicationFiled: November 16, 2005Publication date: March 15, 2007Inventors: Yusuke Ohashi, Akio Tatsumi
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Publication number: 20050091419Abstract: In an information processing system including host computers and disk devices, each of an execution-node host and a standby-node host includes an I/O request unit and an access-right change command unit. The I/O request unit issues an I/O request. The access-right change command unit transmits an access-right change command. The access-right change command results from causing I/O-enable/disable information and the host identification information to correspond to each other. The disk device includes an access control table, an access control unit, and an access-right change unit. The access control table stores information of the access-right change commands from the hosts. The access control unit judges the execution enablement/disablement for the I/O requests from the host identification information and the access control table.Type: ApplicationFiled: March 23, 2004Publication date: April 28, 2005Inventors: Yusuke Ohashi, Toru Horie, Akio Tatsumi
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Publication number: 20050060388Abstract: This invention relates to modifying hardware and program configuration of a computer. In one embodiment, a computer configuration modification method comprises, upon reception of a configuration modification request for the hardware configuration and program configuration of the computer to be modified, transmitting the information regarding the hardware configuration to be modified to a hardware contract renewal notification destination in order to modify the fee to be paid for the modified hardware, and transmitting the information regarding the hardware configuration to be modified and the information regarding the program configuration to be modified to a program contract renewal notification destination in order to modify the fee to be paid for the modified program.Type: ApplicationFiled: August 25, 2003Publication date: March 17, 2005Applicant: Hitachi, Ltd.Inventors: Akio Tatsumi, Hiroyuki Kumazaki, Yuuichirou Kuma
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Publication number: 20040172628Abstract: A distributing node initiates an install control program in receiving nodes, and then broadcasts or multicasts program data to the receiving nodes. Thereby, the installation of the program into the nodes is carried out in shorter time. In this event, the distributing node and the receiving nodes buffer the program data in units of data block sizes of storage devices associated therewith. The distributing node executes in parallel the processing for storing data read from the storage device in a buffer, and the processing for reading the data from the buffer and broadcasting or multicasting the read data to the receiving node. The receiving node executes in parallel the processing for storing the data received from the distributing node in a buffer, and the processing for reading the program data from the buffer and storing the program data in the storage device thereof.Type: ApplicationFiled: March 9, 2004Publication date: September 2, 2004Applicant: HITACHI, LTD.Inventors: Hiromitsu Aramaki, Hiroyuki Takatsu, Akio Tatsumi
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Patent number: 6721612Abstract: A distributing node initiates an install control program in receiving nodes, and then broadcasts or multicasts program data to the receiving nodes. Thereby, the installation of the program into the nodes is carried out in shorter time. In this event, the distributing node and the receiving nodes buffer the program data in units of data block sizes of storage devices associated therewith. The distributing node executes in parallel the processing for storing data read from the storage device in a buffer, and the processing for reading the data from the buffer and broadcasting or multicasting the read data to the receiving node. The receiving node executes in parallel the processing for storing the data received from the distributing node in a buffer, and the processing for reading the program data from the buffer and storing the program data in the storage device thereof.Type: GrantFiled: February 26, 2001Date of Patent: April 13, 2004Assignee: Hitachi, Ltd.Inventors: Hiromitsu Aramaki, Hiroyuki Takatsu, Akio Tatsumi
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Publication number: 20010025200Abstract: A distributing node initiates an install control program in receiving nodes, and then broadcasts or multicasts program data to the receiving nodes. Thereby, the installation of the program into the nodes is carried out in shorter time. In this event, the distributing node and the receiving nodes buffer the program data in units of data block sizes of storage devices associated therewith. The distributing node executes in parallel the processing for storing data read from the storage device in a buffer, and the processing for reading the data from the buffer and broadcasting or multicasting the read data to the receiving node. The receiving node executes in parallel the processing for storing the data received from the distributing node in a buffer, and the processing for reading the program data from the buffer and storing the program data in the storage device thereof.Type: ApplicationFiled: February 26, 2001Publication date: September 27, 2001Inventors: Hiromitsu Aramaki, Hiroyuki Takatsu, Akio Tatsumi