Patents by Inventor Kazuo Ota

Kazuo Ota 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: 11118628
    Abstract: A fluid dynamic bearing device prevents an oleophobic agent from wetting and spreading to a tapered seal portion, including lubricating oil C filled in a condition in which the oil is separated sandwiching a separator portion 240 holding a gas layer arranged between two conical bearing members 201, and two primary tapered seal portions 230 each connecting to one of both ends along an axial direction of the separator portion 240, wherein width in a radial direction of the two primary tapered seal portion 230 decreases as each approaches toward the two conical bearing members 201, a gas-liquid interface of the lubricating oil C is located each of the two primary tapered seal portions 230, an oleophobic agent blocking portion 250 is arranged at each of both ends in an axial direction of the separator portion 240, a separator central portion 244 is arranged between the oleophobic agent blocking portions 250 of the separator portions 240, and an oleophobic coating is formed at least at the separator central portio
    Type: Grant
    Filed: November 3, 2020
    Date of Patent: September 14, 2021
    Assignee: MINEBEA MITSUMI INC.
    Inventors: Hideaki Showa, Daigo Nakajima, Kazuo Ota
  • Publication number: 20210140481
    Abstract: A fluid dynamic bearing device prevents an oleophobic agent from wetting and spreading to a tapered seal portion, including lubricating oil C filled in a condition in which the oil is separated sandwiching a separator portion 240 holding a gas layer arranged between two conical bearing members 201, and two primary tapered seal portions 230 each connecting to one of both ends along an axial direction of the separator portion 240, wherein width in a radial direction of the two primary tapered seal portion 230 decreases as each approaches toward the two conical bearing members 201, a gas-liquid interface of the lubricating oil C is located each of the two primary tapered seal portions 230, an oleophobic agent blocking portion 250 is arranged at each of both ends in an axial direction of the separator portion 240, a separator central portion 244 is arranged between the oleophobic agent blocking portions 250 of the separator portions 240, and an oleophobic coating is formed at least at the separator central portio
    Type: Application
    Filed: November 3, 2020
    Publication date: May 13, 2021
    Inventors: Hideaki SHOWA, Daigo NAKAJIMA, Kazuo OTA
  • Patent number: 10393171
    Abstract: A fluid dynamic pressure bearing includes a conical bearing member having a conical bearing surface forming a first gap between a member constituting the rotor. A second gap connected to one end of the first gap and provided over the entire periphery of the shaft is formed between the conical bearing member and the shaft. A tapered seal portion is formed between the conical bearing member and the rotor. The conical bearing member is provided with a circulation hole that communicates the second gap and the tapered seal portion. The circulation hole communicates to another end of the first gap through a part of the tapered seal portion, so that the circulation hole and the other end of the first gap are spaced apart.
    Type: Grant
    Filed: March 13, 2018
    Date of Patent: August 27, 2019
    Assignee: MINEBEA MITSUMI INC.
    Inventors: Hideaki Showa, Daigo Nakajima, Kazuo Ota
  • Publication number: 20180266482
    Abstract: A fluid dynamic pressure bearing includes a conical bearing member having a conical bearing surface forming a first gap between a member constituting the rotor. A second gap connected to one end of the first gap and provided over the entire periphery of the shaft is formed between the conical bearing member and the shaft. A tapered seal portion is formed between the conical bearing member and the rotor. The conical bearing member is provided with a circulation hole that communicates the second gap and the tapered seal portion. The circulation hole communicates to another end of the first gap through a part of the tapered seal portion, so that the circulation hole and the other end of the first gap are spaced apart.
    Type: Application
    Filed: March 13, 2018
    Publication date: September 20, 2018
    Inventors: Hideaki SHOWA, Daigo NAKAJIMA, Kazuo OTA
  • Patent number: 9418238
    Abstract: A searchable encryption resistant to frequency analysis. A conversion rule management device generates a conversion rule table associating a search keyword with a conversion keyword group. Based on the conversion rule table, a data registration device generates registration data associating encrypted data with an encrypted keyword, and registers the registration data in a server device. An information processing device obtains from the conversion rule table a conversion keyword group associated with a specified search keyword, generates an encrypted keyword group, and requests a data search by specifying the encrypted keyword group. Using as a search key an encrypted keyword included in the encrypted keyword group, the server device searches for encrypted data associated with the search key, and returns searched encrypted data. The information processing device decrypts the searched encrypted data, and outputs as a search result search data obtained by decryption.
    Type: Grant
    Filed: February 20, 2012
    Date of Patent: August 16, 2016
    Assignees: Mitsubishi Electric Corporation, The University of Electro-Communications
    Inventors: Takashi Ito, Mitsuhiro Hattori, Nori Matsuda, Kazuo Ota, Yusuke Sakai
  • Patent number: 8652381
    Abstract: A resin transfer molding (RTM) molding device is designed to mold a fiber-reinforced plastic (FRP) molded body by injecting a resin composition into a mold and by impregnating the molded body therewith. The resin composition is a chain curing polymer (CCP). A CCP accommodating layer is disposed adjacent to an outer side of the molded body. The layer contains the CCP. The layer is provided with a Vf limit value, the value defined by the curing characteristics of the CCP and the characteristics of dissipation of heat from the CCP to the exterior. An element for separating the molded body is disposed between the body and the layer.
    Type: Grant
    Filed: June 26, 2013
    Date of Patent: February 18, 2014
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Noriya Hayashi, Hiroshi Mizuno, Koichi Hasegawa, Kazuo Ota
  • Patent number: 8647095
    Abstract: A resin transfer molding (RTM) molding device is designed to mold a fiber-reinforced plastic (FRP) molded body by injecting a resin composition into a mold and by impregnating the molded body therewith. The resin composition is a chain curing polymer (CCP). A CCP accommodating layer is disposed adjacent to an outer side of the molded body. The layer contains the CCP. The layer is provided with a Vf limit value, the value defined by the curing characteristics of the CCP and the characteristics of dissipation of heat from the CCP to the exterior. An element for separating the molded body is disposed between the body and the layer.
    Type: Grant
    Filed: June 26, 2013
    Date of Patent: February 11, 2014
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Noriya Hayashi, Hiroshi Mizuno, Koichi Hasegawa, Kazuo Ota
  • Publication number: 20130332729
    Abstract: A searchable encryption resistant to frequency analysis. A conversion rule management device generates a conversion rule table associating a search keyword with a conversion keyword group. Based on the conversion rule table, a data registration device generates registration data associating encrypted data with an encrypted keyword, and registers the registration data in a server device. An information processing device obtains from the conversion rule table a conversion keyword group associated with a specified search keyword, generates an encrypted keyword group, and requests a data search by specifying the encrypted keyword group. Using as a search key an encrypted keyword included in the encrypted keyword group, the server device searches for encrypted data associated with the search key, and returns searched encrypted data. The information processing device decrypts the searched encrypted data, and outputs as a search result search data obtained by decryption.
    Type: Application
    Filed: February 20, 2012
    Publication date: December 12, 2013
    Applicants: THE UNIVERSITY OF ELECTRO-COMMUNICATIONS, Mitsubishi Electric Corporation
    Inventors: Takashi Ito, Mitsuhiro Hattori, Nori Matsuda, Kazuo Ota, Yusuke Sakai
  • Publication number: 20130287877
    Abstract: A resin transfer molding (RTM) molding device is designed to mold a fiber-reinforced plastic (FRP) molded body by injecting a resin composition into a mold and by impregnating the molded body therewith. The resin composition is a chain curing polymer (CCP). A CCP accommodating layer is disposed adjacent to an outer side of the molded body. The layer contains the CCP. The layer is provided with a Vf limit value, the value defined by the curing characteristics of the CCP and the characteristics of dissipation of heat from the CCP to the exterior. An element for separating the molded body is disposed between the body and the layer.
    Type: Application
    Filed: June 26, 2013
    Publication date: October 31, 2013
    Inventors: Noriya HAYASHI, Hiroshi MIZUNO, Koichi HASEGAWA, Kazuo OTA
  • Publication number: 20130285293
    Abstract: A resin transfer molding (RTM) molding device is designed to mold a fiber-reinforced plastic (FRP) molded body by injecting a resin composition into a mold and by impregnating the molded body therewith. The resin composition is a chain curing polymer (CCP). A CCP accommodating layer is disposed adjacent to an outer side of the molded body. The layer contains the CCP. The layer is provided with a Vf limit value, the value defined by the curing characteristics of the CCP and the characteristics of dissipation of heat from the CCP to the exterior. An element for separating the molded body is disposed between the body and the layer.
    Type: Application
    Filed: June 26, 2013
    Publication date: October 31, 2013
    Inventors: Noriya HAYASHI, Hiroshi MIZUNO, Koichi HASEGAWA, Kazuo OTA
  • Patent number: 8506278
    Abstract: A resin transfer molding (RTM) molding device is designed to mold a fiber-reinforced plastic (FRP) molded body by injecting a resin composition into a mold and by impregnating the molded body therewith. The resin composition is a chain curing polymer (CCP). A CCP accommodating layer is disposed adjacent to an outer side of the molded body. The layer contains the CCP. The layer is provided with a Vf limit value, the value defined by the curing characteristics of the CCP and the characteristics of dissipation of heat from the CCP to the exterior. An element for separating the molded body is disposed between the body and the layer.
    Type: Grant
    Filed: August 8, 2007
    Date of Patent: August 13, 2013
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Noriya Hayashi, Hiroshi Mizuno, Koichi Hasegawa, Kazuo Ota
  • Patent number: 8501070
    Abstract: A resin transfer molding (RTM) molding device is designed to mold a fiber-reinforced plastic (FRP) molded body by injecting a resin composition into a mold and by impregnating the molded body therewith. The resin composition is a chain curing polymer (CCP). A CCP accommodating layer is disposed adjacent to an outer side of the molded body. The layer contains the CCP. The layer is provided with a Vf limit value, the value defined by the curing characteristics of the CCP and the characteristics of dissipation of heat from the CCP to the exterior. An element for separating the molded body is disposed between the body and the layer.
    Type: Grant
    Filed: July 7, 2011
    Date of Patent: August 6, 2013
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Noriya Hayashi, Hiroshi Mizuno, Koichi Hasegawa, Kazuo Ota
  • Patent number: 8144256
    Abstract: A repeater unit includes an input circuit having an input terminal that can be connected to output of an upstream repeater unit through a signal cable for inputting a video signal from the input terminal; an output circuit having an output terminal that can be connected to input of a downstream repeater unit through a signal cable for outputting a video signal to the output terminal; and a selection circuit that can be connected to a video signal output device for outputting a video signal and outputs the video signal input from the video signal output device to the output circuit. The input circuit and the output circuit have termination resistors matched with each other. When the repeater units are daisy-chained, termination matching is conducted.
    Type: Grant
    Filed: October 4, 2006
    Date of Patent: March 27, 2012
    Assignee: Panasonic Corporation
    Inventor: Kazuo Ota
  • Publication number: 20110260376
    Abstract: The present invention relates to an RTM molding device designed to mold a FRP molded body by injecting a resin composition into a mold and by impregnating the molded body therewith. The resin composition is a CCP. A CCP accommodating layer is disposed adjacent to the outer side of the molded body. The layer contains the CCP. The layer is provided with a Vf limit value, the value defined by the curing characteristics of the CCP and the characteristics of dissipation of heat from the CCP into the exterior. A means for separating the molded body is disposed between the body and the layer.
    Type: Application
    Filed: July 7, 2011
    Publication date: October 27, 2011
    Inventors: Noriya HAYASHI, Hiroshi Mizuno, Koichi Hasegawa, Kazuo Ota
  • Patent number: 7785525
    Abstract: Provided is an RTM molding method enabling to yield an FRP molded body formed so as to be increased in the fiber volume content and to thereby be made more excellent in strength and lightweightness. The resin composition is a chain-curing resin composition, and after the initiation of the curing of the resin composition, the highest temperature at the curing head of the resin composition, undergoing chain curing, within 10 seconds after the initiation of the curing is increased to be higher by 50° C. or more than the temperature of the resin composition at after the impregnation and before the curing, and thus, the resin composition is chain-cured with a Vf of 41% or more.
    Type: Grant
    Filed: July 27, 2006
    Date of Patent: August 31, 2010
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Noriya Hayashi, Hiroshi Mizuno, Koichi Hasegawa, Kazuo Ota
  • Publication number: 20090184437
    Abstract: The present invention relates to an RTM molding device designed to mold a FRP molded body by injecting a resin composition into a mold and by impregnating the molded body therewith. The resin composition is a CCP. A CCP accommodating layer is disposed adjacent to the outer side of the molded body. The layer contains the CCP. The layer is provided with a Vf limit value, the value defined by the curing characteristics of the CCP and the characteristics of dissipation of heat from the CCP into the exterior. A means for separating the molded body is disposed between the body and the layer.
    Type: Application
    Filed: August 8, 2007
    Publication date: July 23, 2009
    Inventors: Noriya Hayashi, Hiroshi Mizuno, Koichi Hasegawa, Kazuo Ota
  • Publication number: 20090102978
    Abstract: A repeater unit includes an input circuit having an input terminal that can be connected to output of an upstream repeater unit through a signal cable for inputting a video signal from the input terminal; an output circuit having an output terminal that can be connected to input of a downstream repeater unit through a signal cable for outputting a video signal to the output terminal; and a selection circuit that can be connected to a video signal output device for outputting a video signal and outputs the video signal input from the video signal output device to the output circuit. The input circuit and the output circuit have termination resistors matched with each other. When the repeater units are daisy-chained, termination matching is conducted.
    Type: Application
    Filed: October 4, 2006
    Publication date: April 23, 2009
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventor: Kazuo Ota
  • Publication number: 20090051067
    Abstract: Provided is an RTM molding method enabling to yield an FRP molded body formed so as to be increased in the fiber volume content and to thereby be made more excellent in strength and lightweightness. The resin composition is a chain-curing resin composition, and after the initiation of the curing of the resin composition, the highest temperature at the curing head of the resin composition, undergoing chain curing, within 10 seconds after the initiation of the curing is increased to be higher by 50° C. or more than the temperature of the resin composition at after the impregnation and before the curing, and thus, the resin composition is chain-cured with a Vf of 41% or more.
    Type: Application
    Filed: July 27, 2006
    Publication date: February 26, 2009
    Inventors: Noriya Hayashi, Hiroshi Mizuno, Koichi Hasegawa, Kazuo Ota
  • Patent number: 7098940
    Abstract: Herein disclosed is a surveillance system, comprising: a camera unit for transforming an image into an image signal and outputting the image signal, and a display unit having a screen and operative to transform into an image the image signal outputted by the camera unit to display the image on the screen. The camera unit is operative to automatically chase an object as a chasing target to have the display unit display the object as the chasing target. The display unit includes marker displaying means for displaying a marker on the screen; and chasing target determining means for determining the object spaced apart from the marker at a predetermined distance as the chasing target among the images displayed on the screen.
    Type: Grant
    Filed: June 21, 2001
    Date of Patent: August 29, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazuya Suzuki, Toshikazu Saito, Kazuo Ota
  • Publication number: 20030202123
    Abstract: A synchronous signal superimposing apparatus and a synchronous signal superimposing method are disclosed which do not require a high power supply voltage, and do not bring about the deterioration in the frequency property of a termination system caused by frequency properties of a coupling capacitor and a driver, and do not require the mechanism for changing the setting of a termination circuit through a switching operation and the like, correspondingly to a camera side. In this apparatus, a constant current driver for responding to an external synchronous signal and a capacitor for stopping a direct current component in an output signal from this constant current driver are placed correspondingly to each of a plurality of cables connected to image pickup units.
    Type: Application
    Filed: April 24, 2003
    Publication date: October 30, 2003
    Inventors: Kazuo Ota, Takuya Yamauchi