Patents by Inventor Kiyofumi Sakurai

Kiyofumi Sakurai 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: 20240029797
    Abstract: A semiconductor storage device includes a first semiconductor substrate, a second semiconductor substrate, a first memory cell and a second memory cell provided between the first semiconductor substrate and the second semiconductor substrate, a first word line electrically connected to the first memory cell, a second word line electrically connected to the second memory cell, a first transistor that is provided on the first semiconductor substrate and electrically connected between the first word line and a first wiring through which a voltage is applied to the first word line, and a second transistor that is provided on the semiconductor substrate and electrically connected between the second word line and a second wiring through which a voltage is applied to the second word line.
    Type: Application
    Filed: October 3, 2023
    Publication date: January 25, 2024
    Inventors: Hiroyuki TAKENAKA, Akihiko CHIBA, Teppei HIGASHITSUJI, Kiyofumi SAKURAI, Hiroaki NAKASA, Youichi MAGOME
  • Patent number: 11810620
    Abstract: A semiconductor storage device includes a first semiconductor substrate, a second semiconductor substrate, a first memory cell and a second memory cell provided between the first semiconductor substrate and the second semiconductor substrate, a first word line electrically connected to the first memory cell, a second word line electrically connected to the second memory cell, a first transistor that is provided on the first semiconductor substrate and electrically connected between the first word line and a first wiring through which a voltage is applied to the first word line, and a second transistor that is provided on the semiconductor substrate and electrically connected between the second word line and a second wiring through which a voltage is applied to the second word line.
    Type: Grant
    Filed: August 26, 2021
    Date of Patent: November 7, 2023
    Assignee: Kioxia Corporation
    Inventors: Hiroyuki Takenaka, Akihiko Chiba, Teppei Higashitsuji, Kiyofumi Sakurai, Hiroaki Nakasa, Youichi Magome
  • Patent number: 11587626
    Abstract: A semiconductor storage device of an embodiment includes a wiring layer M1 and a wiring layer M2. The wiring layer M1 includes a signal line through which a data signal is transferred, and a plurality of dummy patterns formed of a material same as a material of the signal line. The wiring layer M2 includes a voltage supply line through which voltage Vdd is supplied and another voltage supply line through which voltage Vss is supplied. Each of the dummy patterns is electrically connected with any one of the voltage supply lines. In a dummy pattern disposed adjacent to the signal line, a surface facing the signal line is constituted by a first surface positioned at a first distance to the signal line and a second surface positioned at a second distance to the signal line, the second distance being different from the first distance.
    Type: Grant
    Filed: June 2, 2021
    Date of Patent: February 21, 2023
    Assignee: Kioxia Corporation
    Inventors: Toru Ozawa, Kouji Nakao, Yoichi Mizuta, Kiyofumi Sakurai, Youichi Magome, Yoshiaki Takahashi
  • Publication number: 20220246196
    Abstract: A semiconductor storage device includes a first semiconductor substrate, a second semiconductor substrate, a first memory cell and a second memory cell provided between the first semiconductor substrate and the second semiconductor substrate, a first word line electrically connected to the first memory cell, a second word line electrically connected to the second memory cell, a first transistor that is provided on the first semiconductor substrate and electrically connected between the first word line and a first wiring through which a voltage is applied to the first word line, and a second transistor that is provided on the semiconductor substrate and electrically connected between the second word line and a second wiring through which a voltage is applied to the second word line.
    Type: Application
    Filed: August 26, 2021
    Publication date: August 4, 2022
    Inventors: Hiroyuki TAKENAKA, Akihiko CHIBA, Teppei HIGASHITSUJI, Kiyofumi SAKURAI, Hiroaki NAKASA, Youichi MAGOME
  • Publication number: 20220093186
    Abstract: A semiconductor storage device of an embodiment includes a wiring layer M1 and a wiring layer M2. The wiring layer M1 includes a signal line through which a data signal is transferred, and a plurality of dummy patterns formed of a material same as a material of the signal line. The wiring layer M2 includes a voltage supply line through which voltage Vdd is supplied and another voltage supply line through which voltage Vss is supplied. Each of the dummy patterns is electrically connected with any one of the voltage supply lines. In a dummy pattern disposed adjacent to the signal line, a surface facing the signal line is constituted by a first surface positioned at a first distance to the signal line and a second surface positioned at a second distance to the signal line, the second distance being different from the first distance.
    Type: Application
    Filed: June 2, 2021
    Publication date: March 24, 2022
    Applicant: Kioxia Corporation
    Inventors: Toru OZAWA, Kouji NAKAO, Yoichi MIZUTA, Kiyofumi SAKURAI, Youichi MAGOME, Yoshiaki TAKAHASHI
  • Patent number: 10861865
    Abstract: A semiconductor storage device includes first high-potential wirings, second high-potential wirings, a first low-potential wiring, a second low-potential wiring, a first branch wiring, and a second branch wiring formed in a wiring layer between a memory cell array and a semiconductor substrate and each extending in a first direction. The first branch wiring is electrically connected to the first low-potential wiring, and is adjacent to the first low-potential wiring on one side in a second direction perpendicular to the first direction of the first low-potential wiring. The second branch wiring is electrically connected to the second low-potential wiring, and is adjacent to the second low-potential wiring on the other side in the second direction of the second low-potential wiring. A first via is provided to contact the first branch wiring, and a second via is provided to contact the second branch wiring.
    Type: Grant
    Filed: September 5, 2019
    Date of Patent: December 8, 2020
    Assignee: Toshiba Memory Corporation
    Inventors: Yoshiaki Takahashi, Takahiro Tsurudo, Kiyofumi Sakurai
  • Publication number: 20200295024
    Abstract: A semiconductor storage device includes first high-potential wirings, second high-potential wirings, a first low-potential wiring, a second low-potential wiring, a first branch wiring, and a second branch wiring formed in a wiring layer between a memory cell array and a semiconductor substrate and each extending in a first direction. The first branch wiring is electrically connected to the first low-potential wiring, and is adjacent to the first low-potential wiring on one side in a second direction perpendicular to the first direction of the first low-potential wiring. The second branch wiring is electrically connected to the second low-potential wiring, and is adjacent to the second low-potential wiring on the other side in the second direction of the second low-potential wiring. A first via is provided to contact the first branch wiring, and a second via is provided to contact the second branch wiring.
    Type: Application
    Filed: September 5, 2019
    Publication date: September 17, 2020
    Applicant: Toshiba Memory Corporation
    Inventors: Yoshiaki TAKAHASHI, Takahiro TSURUDO, Kiyofumi SAKURAI
  • Patent number: 8942039
    Abstract: This nonvolatile semiconductor memory device comprises: a memory cell array configured having a plurality of blocks arranged therein, each of the blocks configured as an arrangement of NAND cell units, each of the NAND cell units configured having a plurality of electrically rewritable memory cells and a select transistor connected in series; and a row decoder configured to select anyone of the blocks of the memory cell array and supply to any one of said blocks a voltage required in various kinds of operations. The row decoder comprises: a plurality of first transfer transistors each disposed in a first region and connected to any one of the memory cells; and a plurality of second transfer transistors each disposed in a second region and connected to the select transistor, the second region being a residual region of the first region.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: January 27, 2015
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kiyofumi Sakurai, Takuya Futatsuyama
  • Publication number: 20140063953
    Abstract: This nonvolatile semiconductor memory device comprises: a memory cell array configured having a plurality of blocks arranged therein, each of the blocks configured as an arrangement of NAND cell units, each of the NAND cell units configured having a plurality of electrically rewritable memory cells and a select transistor connected in series; and a row decoder configured to select anyone of the blocks of the memory cell array and supply to any one of said blocks a voltage required in various kinds of operations. The row decoder comprises: a plurality of first transfer transistors each disposed in a first region and connected to any one of the memory cells; and a plurality of second transfer transistors each disposed in a second region and connected to the select transistor, the second region being a residual region of the first region.
    Type: Application
    Filed: March 15, 2013
    Publication date: March 6, 2014
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Kiyofumi SAKURAI, Takuya Futatsuyama
  • Patent number: 8233325
    Abstract: A method of controlling a programming of a flash memory with memory blocks. The method includes checking whether a selected block among the memory blocks belongs to a first group or a second group. The method further includes executing the programming from a least bit address when the selected block belongs to the first group. The method also includes executing the programming from a most bit address when the selected block belongs to the second group.
    Type: Grant
    Filed: May 16, 2011
    Date of Patent: July 31, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kiyofumi Sakurai, Takuya Futatsuyama
  • Publication number: 20110216593
    Abstract: A method of controlling a programming of a flash memory with memory blocks. The method includes checking whether a selected block among the memory blocks belongs to a first group or a second group. The method further includes executing the programming from a least bit address when the selected block belongs to the first group. The method also includes executing the programming from a most bit address when the selected block belongs to the second group.
    Type: Application
    Filed: May 16, 2011
    Publication date: September 8, 2011
    Inventors: KIYOFUMI SAKURAI, Takuya Futatsuyama
  • Patent number: 7952930
    Abstract: A NAND flash memory according to examples of the invention includes a memory cell array comprised of first, second, and third NAND blocks disposed in order in a first direction and first and second transfer transistor blocks disposed in order in the first direction at one end in a second direction intersecting with the first direction of the memory cell array. An address allocation to the word lines in the first NAND block is inverted against an address allocation to the word lines in the third NAND block.
    Type: Grant
    Filed: July 2, 2009
    Date of Patent: May 31, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kiyofumi Sakurai, Takuya Futatsuyama
  • Publication number: 20100014350
    Abstract: A NAND flash memory according to examples of the invention includes a memory cell array comprised of first, second, and third NAND blocks disposed in order in a first direction and first and second transfer transistor blocks disposed in order in the first direction at one end in a second direction intersecting with the first direction of the memory cell array. An address allocation to the word lines in the first NAND block is inverted against an address allocation to the word lines in the third NAND block.
    Type: Application
    Filed: July 2, 2009
    Publication date: January 21, 2010
    Inventors: Kiyofumi SAKURAI, Takuya Futatsuyama
  • Patent number: 7650584
    Abstract: An ASIC includes a first-wire extended in a first-direction and a second-wire extended in a parallel direction to the first-wire and both are placed on a first-wire layer; and a third-wire placed on a second-wire layer above the first-wire layer and is extended above the wire and above the second-wire in a second-direction which intersects the first-direction and passing through a first via-hole is connected to the first-wire, and a fourth-wire separated from the third-wire extended in a parallel direction above the first-wire and above the second-wire and a fifth-wire separated from both the third-wire and the fourth-wire and extended in a parallel direction in a smallest space and passing through a second via-hole is connected to the second-wire, wherein, one end of the fifth-wire is extended to the center between the second-wire and the first-wire from above the second-wire.
    Type: Grant
    Filed: August 14, 2007
    Date of Patent: January 19, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hitoshi Shiga, Kiyofumi Sakurai, Kenji Mima
  • Publication number: 20080074929
    Abstract: An ASIC includes a first-wire extended in a first-direction and a second-wire extended in a parallel direction to the first-wire and both are placed on a first-wire layer; and a third-wire placed on a second-wire layer above the first-wire layer and is extended above the wire and above the second-wire in a second-direction which intersects the first-direction and passing through a first via-hole is connected to the first-wire, and a fourth-wire separated from the third-wire extended in a parallel direction above the first-wire and above the second-wire and a fifth-wire separated from both the third-wire and the fourth-wire and extended in a parallel direction in a smallest space and passing through a second via-hole is connected to the second-wire, wherein, one end of the fifth-wire is extended to the center between the second-wire and the first-wire from above the second-wire.
    Type: Application
    Filed: August 14, 2007
    Publication date: March 27, 2008
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Hitoshi SHIGA, Kiyofumi Sakurai, Kenji Mima
  • Patent number: 7274617
    Abstract: A non-volatile semiconductor memory includes: a cell array including a plurality of memory cells arranged in a matrix; a plurality of bit lines extending in a column direction of the matrix; a sense amplifier configured to amplify data read out from the memory cells via the bit lines; a shield power supply providing a voltage to shield the bit lines; and a bit line selection circuit, configured to connect even bit lines to the shield power supply when odd bit lines are connected to the sense amplifier, and to connect the odd bit lines to the shield power supply when the even bit lines are connected to the sense amplifier.
    Type: Grant
    Filed: November 22, 2005
    Date of Patent: September 25, 2007
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kiyofumi Sakurai, Hiroshi Maejima
  • Publication number: 20060133139
    Abstract: A non-volatile semiconductor memory includes: a cell array including a plurality of memory cells arranged in a matrix; a plurality of bit lines extending in a column direction of the matrix; a sense amplifier configured to amplify data read out from the memory cells via the bit lines; a shield power supply providing a voltage to shield the bit lines; and a bit line selection circuit, configured to connect even bit lines to the shield power supply when odd bit lines are connected to the sense amplifier, and to connect the odd bit lines to the shield power supply when the even bit lines are connected to the sense amplifier.
    Type: Application
    Filed: November 22, 2005
    Publication date: June 22, 2006
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kiyofumi Sakurai, Hiroshi Maejima
  • Patent number: 6104233
    Abstract: A p-well region (16) is formed in the main surface area of an n-type semiconductor substrate (11). A potential (V.sub.BB) which is lower than an externally input potential is applied to the p-well region (16). In the surface area of the p-well region (16), a first impurity diffused layer (12) of n-type to which the externally input potential (Vin) is applied and a second impurity diffused layer (13) of n-type to which a reference potential is applied are formed. The first impurity diffused layer (12) serves as the drain region of a first MOS transistor (Q9) of n-channel formed in the p-well region (16) and the second impurity diffused layer (13) serves as the drain region of a second MOS transistor (Q10) of n-channel which is also formed in the p-well region (16). The first and second MOS transistors (Q9 and Q10) constitute the input section of an input circuit.
    Type: Grant
    Filed: January 10, 1994
    Date of Patent: August 15, 2000
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Syuso Fujii, Mitsuru Shimizu, Kiyofumi Sakurai
  • Patent number: 5712827
    Abstract: In a dynamic type memory, a memory cell array is divided into a plurality of sub arrays on a memory chip. Each of the sub arrays is provided with a data line formed in parallel with word lines. Data buffer and multiplexer circuits and I/O pads are arranged on one side of the memory chip in parallel with bit lines. This arrangement allows a data path to be shortened and enables data to be transferred at high speed.
    Type: Grant
    Filed: September 19, 1995
    Date of Patent: January 27, 1998
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masaki Ogihara, Satoru Takase, Kiyofumi Sakurai
  • Patent number: RE37427
    Abstract: In a dynamic type memory, a memory cell array is divided into a plurality of sub arrays on a memory chip. Each of the sub arrays is provided with a data line formed in parallel with word lines. Data buffer and multiplexer circuits and I/O pads are arranged on one side of the memory chip in parallel with bit lines. This arrangement allows a data path to be shortened and enables data to be transferred at high speed.
    Type: Grant
    Filed: January 27, 2000
    Date of Patent: October 30, 2001
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masaki Ogihara, Satoru Takase, Kiyofumi Sakurai