公开(公告)号：US11955985B2

公开(公告)日：2024-04-09

申请号：US17782766

申请日：2019-12-10

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Tadashi Minotani ,  Kenichi Matsunaga

IPC: H03M1/00 ,  H03M1/34

CPC classification number: H03M1/34

Abstract: An AD converter includes: an integration unit that uses an input voltage as an initial value and repeats an operation of integrating one or both of two types of unit voltages with the input voltage, thereby generating an integrated voltage; a switching threshold voltage unit that includes two types of threshold voltages causing the operation of integrating to be terminated; a comparator that compares the integrated voltage with the threshold voltages; an integration determination unit that, before the operation of integrating is started, causes the comparator to compare the input voltage with a rough adjustment threshold voltage corresponding to a larger one of the unit voltages; a unit voltage switching control unit that, when the rough adjustment threshold voltage is larger than the input voltage, controls the integration unit to generate the integrated voltage by using the two types of unit voltages; and a single unit voltage control unit that, when the rough adjustment threshold voltage is smaller than the input voltage, controls the integration unit to generate the integrated voltage by using only a smaller one of the unit voltages.

公开(公告)号：US20230420316A1

公开(公告)日：2023-12-28

申请号：US18252963

申请日：2020-11-19

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Tadashi Minotani

IPC: H01L23/14 ,  H01L23/498 ,  H01L23/00 ,  H01L25/065

CPC classification number: H01L23/142 ,  H01L23/49816 ,  H01L24/16 ,  H01L25/0655 ,  H01L2224/16225 ,  H01L2924/15174 ,  H01L2924/15311

Abstract: An integrated electronic component includes a lower chip having electrode pads, a molded resin, a rewiring layer, and an upper chip having electrode pads. The rewiring layer has electrode pads that are formed on the lower surface of an insulator and are connected to the electrode pads, electrode pads that are formed on the upper surface of the insulator and are connected to the electrode pads, and interlayer connection conductors that are formed in the insulator and connect the electrode pads and the electrode pads. The electrode pads and the electrode pads are disposed to face each other.

公开(公告)号：US11770127B2

公开(公告)日：2023-09-26

申请号：US17608106

申请日：2019-05-21

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Tadashi Minotani ,  Kenichi Matsunaga

IPC: H03M1/10 ,  H03M1/56

CPC classification number: H03M1/1023 ,  H03M1/10 ,  H03M1/56

Abstract: A self-calibration-function-equipped AD converter that does not require a measurement device for calibration includes: a control unit including a calibration control unit configured to control an operation of calibrating the self-calibration-function-equipped AD converter, and a conversion control unit configured to control an operation of converting an input voltage to be subjected to conversion into a digital signal; a reference voltage unit configured to output a reference voltage; and an integration/conversion unit including an integrating unit configured to generate an integration voltage obtained by integrating two or more types of unit voltages, a comparator that has two inputs and is configured to compare the integration voltage and the input voltage or the reference voltage, and a crossbar switch configured to switch a connection depending on whether the integration voltage is to be input to one input of the comparator and the input voltage or the reference voltage is to be input to another input, or the input voltage or the reference voltage is to be input to the one input of the comparator and the integration voltage is to be input to the other input.

公开(公告)号：US20230081045A1

公开(公告)日：2023-03-16

申请号：US17797918

申请日：2020-02-07

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Eri Matsunaga ,  Tadashi Minotani ,  Masayuki Tsuda

IPC: G01L5/24

Abstract: A bolt tightening torque management structure for a bolt for fastening a component includes: the bolt including a plurality of projections of different heights on a bearing surface of a head; a non-conductive film that is formed on the surface of the component, has a shaft hole through which a shaft of the bolt extends, and has a predetermined size; and a conductive film that has the shaft hole and a plurality of grooves, through which the projections extend, is formed on the non-conductive film, and has the same planar shape as the non-conductive film. The projections other than the projection having the smallest height are configured to be in contact with the surface of the component when the tightening torque of the bolt is appropriate. The base of each projection has a width dimensioned to close the corresponding groove.

公开(公告)号：US11454607B2

公开(公告)日：2022-09-27

申请号：US17285431

申请日：2019-11-01

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Tadashi Minotani ,  Eri Matsunaga ,  Masahito Nakamura ,  Masayuki Tsuda

IPC: G01N27/02 ,  G01N27/90

Abstract: A crack detection device includes: a sensor unit that has a three-layer structure of conductor-insulator-conductor and is attached to a structure; a frequency characteristics acquisition unit that sweeps a predetermined frequency range to acquire a plurality of frequencies at which the impedance of the sensor unit is maximum or minimum; a crack presence/absence determination unit that determines the presence or absence of a crack based on a nonuniformity of the plurality of frequencies; a crack position table in which a relationship between crack positions and frequency shift directions is recorded; and a crack position detection unit that, when the crack presence/absence determination unit determines that there is a crack, takes a difference between two frequencies acquired by the frequency characteristics acquisition unit to determine a sign, and then refers to the crack position table in accordance with the sign to detect a crack position.

公开(公告)号：US20220228996A1

公开(公告)日：2022-07-21

申请号：US17614660

申请日：2019-05-30

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Eri Matsunaga ,  Tadashi Minotani ,  Masahito Nakamura ,  Masayuki Tsuda ,  Takashi Sawada

IPC: G01N22/00 ,  G01N27/22 ,  G01L5/24

Abstract: A looseness detection structure includes: a structure (transducer) T which is formed on a surface of a cable; a screw which tightens and fixes the cable in contact with the structure T; and a terminal (detection unit) which transmits a transmission signal to the structure T, receives a reception signal returning after propagating through the structure T, and detects the loosening of the screw based on a change in the reception signal.

公开(公告)号：US11368162B2

公开(公告)日：2022-06-21

申请号：US17292685

申请日：2019-10-29

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Tadashi Minotani ,  Kenichi Matsunaga

IPC: H03M1/10

Abstract: An AD converter is provided with a control unit including a calibration control unit that controls an operation for calibrating the control unit and a conversion control unit that controls an operation for converting a target input voltage into a digital signal; a reference voltage unit that outputs a reference voltage; and an integrating converter unit including an integrating unit that generates an integrated voltage by integrating a predetermined unit voltage, a comparator that has two inputs and compares the integrated voltage and an input voltage or a reference voltage Vref, and a crossbar switch that switches connections between the case where the integrated voltage is inputted to one of the inputs of the comparator and the input voltage or the reference voltage Vref is inputted to the other input and the case where the input voltage or the reference voltage Vref is inputted to one of the inputs of the comparator and the integrated voltage is inputted to the other input.

公开(公告)号：US20250015773A1

公开(公告)日：2025-01-09

申请号：US18711734

申请日：2021-11-22

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Tadashi Minotani

IPC: H03F3/68

Abstract: In a multi-stage amplifier, a plurality of amplifier circuits are connected in series, and the amplifier circuit has a 0 dB frequency at which magnitude of a normalized transfer function normalized at a low frequency gain becomes 1 at a frequency other than a direct current.

公开(公告)号：US20240275396A1

公开(公告)日：2024-08-15

申请号：US18563115

申请日：2021-06-16

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Tadashi Minotani ,  Kenichi Matsunaga

IPC: H03M1/10

CPC classification number: H03M1/1014

Abstract: An A/D converter includes: a first reference voltage unit that generates a temperature-compensated reference voltage; a second reference voltage unit that generates a second reference voltage calibrated with the reference voltage; an integration unit that generates an integrated voltage obtained by integrating unit voltages using any one of the reference voltage, the second reference voltage, and a ground voltage as an initial value during calibration; a comparator that compares the integrated voltage with a threshold voltage and outputs a determination signal; a calibration control unit that measures an integration time until the integrated voltage exceeds the threshold voltage from the initial value during calibration and calibrates the unit voltages and an offset voltage of the comparator; and a conversion control unit that converts an input voltage into a digital value using a conversion integration time which is the integration time when the input voltage is an initial value and the second reference voltage during conversion.

公开(公告)号：US11976993B2

公开(公告)日：2024-05-07

申请号：US17774670

申请日：2019-11-08

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Eri Matsunaga ,  Tadashi Minotani ,  Masahito Nakamura ,  Masayuki Tsuda

IPC: G01L5/24 ,  G01L1/20 ,  G01L1/22

CPC classification number: G01L5/243 ,  G01L1/20 ,  G01L1/2231 ,  G01L5/24

Abstract: A loosening detection structure used to detect loosening of a bolt includes a material that is disposed between a fixing subject steel plate and a head portion of a metal bolt for fixing the steel plate and either attached to a seating surface of the head portion of the bolt or attached to a washer disposed between the steel plate and the head portion of the bolt, and that has electrical characteristics that vary in response to variation in a force for fastening the bolt to the steel plate.