Patents by Inventor Jun Nitta

Jun Nitta 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).

  • Publication number: 20220241838
    Abstract: The present invention has as its technical problem to provide a punching method able to stably secure a stretch-flangeability equal to or greater than the case of using a punch having a flat blade at its bottom surface. The punching method of the present invention is a method of punching a metal sheet using a punching and shearing device provided with a punch having an upper blade having a horizontal part with respect to the cutting line in part and having parts other than the horizontal part comprised of inclined parts and a die having a lower blade wherein the upper blade used for the punching process has a shape where the inclined parts first contact the metal sheet at the time of a punching process.
    Type: Application
    Filed: July 10, 2020
    Publication date: August 4, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Jun NITTA, Takashi YASUTOMI, Ryo TABATA
  • Publication number: 20220231250
    Abstract: According to one embodiment, a display device includes a lower electrode, a second insulating layer including an opening overlapping the lower electrode, an organic layer including a light-emitting layer and a functional layer, disposed in the opening and covering the lower electrode and an upper electrode covering the organic layer. The functional layer includes a first region located between the lower electrode and the light-emitting layer and a second region including an end surface located directly above the second insulating layer. A dopant concentration of a guest material in the second region is lower than the dopant concentration of the guest material in the first region.
    Type: Application
    Filed: January 13, 2022
    Publication date: July 21, 2022
    Applicant: Japan Display Inc.
    Inventors: Hayata AOKI, Masumi NISHIMURA, Jun NITTA
  • Publication number: 20220199937
    Abstract: According to one embodiment, a display device includes first and second lower electrodes, a second insulating layer arranged between the first and second lower electrodes, and having first and second openings overlapping the first and second lower electrodes, a partition arranged on the second insulating layer, a first organic layer arranged in the first opening and covering the first lower electrode, and a first upper electrode covering the first organic layer. The partition has a first layer formed of a metal material and a second layer protruding from a first side surface of the first layer toward the first opening. The first upper electrode is in contact with the first side surface.
    Type: Application
    Filed: December 8, 2021
    Publication date: June 23, 2022
    Applicant: Japan Display Inc.
    Inventor: Jun NITTA
  • Publication number: 20220140061
    Abstract: According to one embodiment, a display device includes a bank covering an edge and a side surface of a pixel electrode and having an opening exposing a part of an upper surface of the pixel electrode, a hole transport layer arranged in the opening and disposed over the pixels, a metal line disposed with the hole transport layer sandwiched on a top area of the bank, a light emitting layer disposed between a plurality of the banks adjacent to each other and disposed in the opening in each of the pixels, wherein the light emitting layer comprises a first light emitting layer in the first pixel, a second light emitting layer in the second pixel, and a third light emitting layer in the third pixel, and the metal line is in contact with the third light emitting layer.
    Type: Application
    Filed: November 5, 2021
    Publication date: May 5, 2022
    Applicant: Japan Display Inc.
    Inventor: Jun NITTA
  • Patent number: 11192161
    Abstract: There is provided a hole widening method including a preparing process of preparing a forming tool which has a diameter-increasing portion increasing in diameter from a front end side toward a rear end side and a line-shaped projection formed to protrude outward from a surface of the diameter-increasing portion, and a workpiece in which a pilot hole is formed; and a hole widening process of successively widening the pilot hole by pushing the forming tool into the pilot hole such that the line-shaped projection of the forming tool comes into point contact with a part of a circumferential edge portion of the pilot hole in the workpiece two times or more, and forming a stretched flange.
    Type: Grant
    Filed: September 2, 2016
    Date of Patent: December 7, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Jun Nitta, Shigeru Yonemura, Satoshi Shirakami, Takashi Yasutomi
  • Patent number: 11016011
    Abstract: In a breaking prediction method of predicting a breaking portion of a component, which is obtained by forming a metal sheet, by using a finite element method, the breaking portion is easily and reliably extracted.
    Type: Grant
    Filed: May 18, 2016
    Date of Patent: May 25, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Jun Nitta, Shigeru Yonemura, Satoshi Shirakami, Takashi Yasutomi
  • Patent number: 10695814
    Abstract: A method for manufacturing a press-formed product includes: a first step of preparing a long material having a bending portion; and a second step of decreasing curvature of the bending portion while restricting both ends of the long material in a longitudinal direction.
    Type: Grant
    Filed: March 3, 2015
    Date of Patent: June 30, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Jun Nitta, Tohru Yoshida, Hiroshi Yoshida, Nobuo Yoshikawa, Shigeru Yonemura
  • Patent number: 10467361
    Abstract: A stretch flange crack prediction method of predicting initiation of stretch flange cracks that occurs in a flange end section during stretch flange forming of a deformable sheet, includes: a measurement value acquisition process of acquiring, for each of a plurality of sheet-shaped test pieces, a fracture strain measurement value, a normal strain gradient measurement value, and a circumferential strain gradient measurement value; a CAE analysis process of acquiring a maximum major strain maximum element having a highest maximum major strain, a normal strain gradient of the maximum major strain maximum element, and a circumferential strain gradient of the maximum major strain maximum element; a fracture determination threshold acquisition process of acquiring a fracture determination threshold by converting the fracture strain measurement value; and a prediction process of predicting that stretch flange cracks will be initiated, when the maximum major strain is equal to or higher than the fracture determinati
    Type: Grant
    Filed: July 2, 2015
    Date of Patent: November 5, 2019
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Satoshi Shirakami, Hiroshi Yoshida, Takashi Miyagi, Jun Nitta, Tohru Yoshida
  • Patent number: 10444732
    Abstract: A blank shape determining method includes: a process of making a forming analysis of forming a reference blank into a reference formed product and a acquiring sheet thickness distribution and a plastic strain distribution; a process of acquiring a forming failure evaluation index for the reference blank; a process of estimating a region, which includes an end edge portion at which the forming failure evaluation index exceeds a predetermined threshold, within the reference blank as a forming failure region; a process of generating a plurality of corrected blanks; a process of making a forming analysis of forming the corrected blanks into corrected formed products and acquiring a sheet thickness distribution and a plastic strain distribution; a process of acquiring the forming failure evaluation index for the corrected formed product; and a process of determining a shape of the corrected blank having a smallest maximum value of the forming failure evaluation index as a shape of a blank provided for press formin
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: October 15, 2019
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Shigeru Yonemura, Tohru Yoshida, Jun Nitta, Toshiyuki Niwa
  • Publication number: 20190212236
    Abstract: A fracture determination device is provided which can predict fracture in an ultra-hard steel material.
    Type: Application
    Filed: October 5, 2017
    Publication date: July 11, 2019
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Takahiro AITOH, Jun NITTA, Yoshiyuki KASEDA
  • Patent number: 10220427
    Abstract: [Object] To provide a press-molding apparatus capable of appropriately thickening a vertical wall portion while preventing the occurrence of buckling. [Solution] Provided is a press-molding apparatus configured to mold a press-molded product by performing press working on a work, the press-molding apparatus including: a support member that supports the work with a first thickness having a hat-shaped cross-section or a U-shaped cross-section; a punch member that moves relative to the support member to execute press working so as to reduce a height of a vertical wall portion of the work and thicken the vertical wall portion to a second thickness; and a pad member that faces the support member with the vertical wall portion to be thickened placed therebetween, the pad member being biased by a biasing member and having its distance to the support member kept equal to or smaller than the second thickness during the press working.
    Type: Grant
    Filed: December 5, 2014
    Date of Patent: March 5, 2019
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Nobuo Yoshikawa, Hiroshi Yoshida, Jun Nitta, Tohru Yoshida
  • Publication number: 20180200772
    Abstract: There is provided a hole widening method including a preparing process of preparing a forming tool which has a diameter-increasing portion increasing in diameter from a front end side toward a rear end side and a line-shaped projection formed to protrude outward from a surface of the diameter-increasing portion, and a workpiece in which a pilot hole is formed; and a hole widening process of successively widening the pilot hole by pushing the forming tool into the pilot hole such that the line-shaped projection of the forming tool comes into point contact with a part of a circumferential edge portion of the pilot hole in the workpiece two times or more, and forming a stretched flange.
    Type: Application
    Filed: September 2, 2016
    Publication date: July 19, 2018
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Jun NITTA, Shigeru YONEMURA, Satoshi SHIRAKAMI, Takashi YASUTOMI
  • Publication number: 20180136100
    Abstract: In a breaking prediction method of predicting a breaking portion of a component, which is obtained by forming a metal sheet, by using a finite element method, the breaking portion is easily and reliably extracted.
    Type: Application
    Filed: May 18, 2016
    Publication date: May 17, 2018
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Jun NITTA, Shigeru YONEMURA, Satoshi SHIRAKAMI, Takashi YASUTOMI
  • Publication number: 20180107772
    Abstract: A stretch flange crack prediction method of predicting initiation of stretch flange cracks that occurs in a flange end section during stretch flange forming of a deformable sheet, includes: a measurement value acquisition process of acquiring, for each of a plurality of sheet-shaped test pieces, a fracture strain measurement value, a normal strain gradient measurement value, and a circumferential strain gradient measurement value; a CAE analysis process of acquiring a maximum major strain maximum element having a highest maximum major strain, a normal strain gradient of the maximum major strain maximum element, and a circumferential strain gradient of the maximum major strain maximum element; a fracture determination threshold acquisition process of acquiring a fracture determination threshold by converting the fracture strain measurement value; and a prediction process of predicting that stretch flange cracks will be initiated, when the maximum major strain is equal to or higher than the fracture determinati
    Type: Application
    Filed: July 2, 2015
    Publication date: April 19, 2018
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Satoshi SHIRAKAMI, Hiroshi YOSHIDA, Takashi MIYAGI, Jun NITTA, Tohru YOSHIDA
  • Publication number: 20180032057
    Abstract: A blank shape determining method includes: a process of making a forming analysis of forming a reference blank into a reference formed product and a acquiring sheet thickness distribution and a plastic strain distribution; a process of acquiring a forming failure evaluation index for the reference blank; a process of estimating a region, which includes an end edge portion at which the forming failure evaluation index exceeds a predetermined threshold, within the reference blank as a forming failure region; a process of generating a plurality of corrected blanks; a process of making a forming analysis of forming the corrected blanks into corrected formed products and acquiring a sheet thickness distribution and a plastic strain distribution; a process of acquiring the forming failure evaluation index for the corrected formed product; and a process of determining a shape of the corrected blank having a smallest maximum value of the forming failure evaluation index as a shape of a blank provided for press formin
    Type: Application
    Filed: March 24, 2016
    Publication date: February 1, 2018
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Shigeru YONEMURA, Tohru YOSHIDA, Jun NITTA, Toshiyuki NIWA
  • Publication number: 20160325330
    Abstract: A method for manufacturing a press-formed product includes: a first step of preparing a long material having a bending portion; and a second step of decreasing curvature of the bending portion while restricting both ends of the long material in a longitudinal direction.
    Type: Application
    Filed: March 3, 2015
    Publication date: November 10, 2016
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Jun NITTA, Tohru YOSHIDA, Hiroshi YOSHIDA, Nobuo YOSHIKAWA, Shigeru YONEMURA
  • Publication number: 20160263637
    Abstract: [Object] To provide a press-molding apparatus capable of appropriately thickening a vertical wall portion while preventing the occurrence of buckling. [Solution] Provided is a press-molding apparatus configured to mold a press-molded product by performing press working on a work, the press-molding apparatus including: a support member that supports the work with a first thickness having a hat-shaped cross-section or a U-shaped cross-section; a punch member that moves relative to the support member to execute press working so as to reduce a height of a vertical wall portion of the work and thicken the vertical wall portion to a second thickness; and a pad member that faces the support member with the vertical wall portion to be thickened placed therebetween, the pad member being biased by a biasing member and having its distance to the support member kept equal to or smaller than the second thickness during the press working.
    Type: Application
    Filed: December 5, 2014
    Publication date: September 15, 2016
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Nobuo YOSHIKAWA, Hiroshi YOSHIDA, Jun NITTA, Tohru YOSHIDA
  • Patent number: 9408991
    Abstract: A pump unit can achieve significant size reduction while maintaining the performance thereof. Micropumps are arranged in a lattice pattern with rows and columns, and a discharge port of at least a micropump arranged in the most downstream row is directly connected to an integrated discharge port. The pump unit further includes: a discharge direct-connection mechanism for connecting respective discharge ports of a plurality of micropumps in a middle row directly to the integrated discharge port; an intake direct-connection mechanism for connecting respective intake ports of the micropumps directly to a fluid to be supplied first; a series-connection mechanism for connecting a discharge port of a micropump in an upstream row directly to an intake port of a micropump in a downstream row; and a controller for controlling the discharge direct-connection mechanism, the intake direct-connection mechanism, and the series-connection mechanism.
    Type: Grant
    Filed: January 9, 2012
    Date of Patent: August 9, 2016
    Assignee: Metran Co. Ltd.
    Inventors: Kazufuku Nitta, Jun Nitta
  • Patent number: 8589121
    Abstract: When discretizing an analysis target part into plural elements and performing analysis, sheet thickness reduction rate or maximum principal strain at an equivalent position including a same element is compared by either a manner of combining two adjacent elements after the analysis or a manner of changing an element discretization size with two types and performing the analysis, and the element where the difference is large is extracted as a fracture risk portion. With this structure, a fracture risk portion can be extracted reliably when a fracture is predicted by a finite element method.
    Type: Grant
    Filed: April 14, 2008
    Date of Patent: November 19, 2013
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Akihiro Uenishi, Takashi Ariga, Shigeru Yonemura, Jun Nitta, Tohru Yoshida
  • Publication number: 20120304993
    Abstract: A pump unit can achieve significant size reduction while maintaining the performance thereof. Micropumps are arranged in a lattice pattern with rows and columns, and a discharge port of at least a micropump arranged in the most downstream row is directly connected to an integrated discharge port. The pump unit further includes: a discharge direct-connection mechanism for connecting respective discharge ports of a plurality of micropumps in a middle row directly to the integrated discharge port; an intake direct-connection mechanism for connecting respective intake ports of the micropumps directly to a fluid to be supplied first; a series-connection mechanism for connecting a discharge port of a micropump in an upstream row directly to an intake port of a micropump in a downstream row; and a controller for controlling the discharge direct-connection mechanism, the intake direct-connection mechanism, and the series-connection mechanism.
    Type: Application
    Filed: January 9, 2012
    Publication date: December 6, 2012
    Inventors: Kazufuku NITTA, Jun Nitta