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公开(公告)号：US11331693B2
公开(公告)日：2022-05-17
申请号：US16361605
申请日：2019-03-22
Applicant: Hitachi, Ltd.
Inventor： Hiroaki Hasegawa , Kengo Imagawa , Shuntaro Machida , Taiichi Takezaki
Abstract: Capacitors, each of which is electrically connected to a capacitor which is the cell of the CMUT mounted in a chip and is used as a DC block capacitor for protecting an amplifying circuit, are formed as many as plural aligned channels in the chip. The capacitor is an electrostatic capacitance element which is not vibrated acoustically.
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公开(公告)号：US11660076B2
公开(公告)日：2023-05-30
申请号：US16596917
申请日：2019-10-09
Applicant: Hitachi, Ltd.
Inventor： Shinya Kajiyama , Kengo Imagawa , Yoshihiro Hayashi
CPC classification number: A61B8/54 , A61B8/44 , G01S7/52077
Abstract: A switch circuit connected to a transducer, a reception circuit connected to the switch circuit, a first switch element connected to a reception terminal provided between the switch circuit and the reception circuit, a first resistance element connected to a control terminal of the switch circuit, a second resistance element provided inside the reception circuit, and a second switch element provided inside the reception circuit are provided.
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公开(公告)号：US11191527B2
公开(公告)日：2021-12-07
申请号：US16361858
申请日：2019-03-22
Applicant: Hitachi, Ltd.
Inventor： Yutaka Igarashi , Shinya Kajiyama , Yohei Nakamura , Kengo Imagawa , Kazuhiro Amino , Takayuki Iwashita
Abstract: Provided is a probe which transmits an ultrasonic wave to a diagnostic site and receives a reception signal which is a reflected wave. The probe includes: a plurality of transducers; a plurality of low-noise amplifying circuits respectively corresponding to the plurality of transducers; and a single differential converter which converts a control signal rising with the elapse of time to a first bias signal rising with the elapse of time and a second bias signal falling with the elapse of time to control the plurality of low-noise amplifying circuits, and the low-noise amplifying circuit includes an attenuator which attenuates: an electric signal from the transducer; a first amplifying circuit which sets the first bias signal as a bias and amplifies an output signal of the attenuator to be gradually increased with the elapse of time; a second amplifying circuit which sets the second bias signal as a bias and amplifies the output signal of the attenuator to be gradually reduced with the elapse of time; and a subtractor which subtracts an output of the first amplifying circuit and an output of the second amplifying circuit.
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Patent Agency Ranking
公开(公告)号：US10799213B2
公开(公告)日：2020-10-13
申请号：US15102542
申请日：2014-11-28
Applicant: Hitachi, Ltd.
Inventor： Takuma Nishimoto , Yutaka Igarashi , Toru Yazaki , Kengo Imagawa , Yusaku Katsube
Abstract: Provided are an ultrasound probe, an element circuit thereof, and an ultrasound diagnostic device, whereby high image quality is possible and reduced size and lower cost are made possible. Provided is an ultrasound probe, comprising: a 2-D array transducer wherein a plurality of transducers are arrayed two-dimensionally; and a 2-D array IC in which are formed, upon an IC substrate, drive circuits which are disposed upon each of the transducers of the 2-D array transducer to drive each of the transducers at different timings with a prescribed delay quantity, and common current sources which supply drive current to the transducers of the 2-D array transducer. The number n of the common current sources which are formed upon the IC substrate is fewer than the number N of the drive circuits which are formed upon the IC substrate.
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公开(公告)号：US10448923B2
公开(公告)日：2019-10-22
申请号：US15315696
申请日：2014-06-06
Applicant: HITACHI, LTD.
Inventor： Takuma Nishimoto , Yutaka Igarashi , Yusaku Katsube , Kengo Imagawa
Abstract: Amplification of a signal by a small circuit size and reduction of a power are achieved.A current controlling current source unit 53 changes an outputting current based on a transition time setting signal tp. A current controlling current source unit 54 changes a drawing current based on a transition time setting signal tn. An amplitude control unit 55 changes a power source voltage supplied to the current controlling current source unit 53 and changes amplitude of a voltage generated by a current outputted from the current controlling current source unit 53, based on amplitude setting signal ap. An amplitude control unit 56 changes a power source voltage supplied to the current controlling current source unit 54 and changes amplitude of a voltage generated by the current drawn by the current controlling current source unit 54, based on amplitude setting signal an. The buffer unit 57 drives a load in accordance with the current outputted from the current controlling current source unit 53 and the current drawn from the current controlling current source unit 54.
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公开(公告)号：US11921241B2
公开(公告)日：2024-03-05
申请号：US17184730
申请日：2021-02-25
Applicant: Hitachi, Ltd.
Inventor： Yutaka Igarashi , Shinya Kajiyama , Kengo Imagawa
CPC classification number: G01S7/52033 , G01S7/52046 , G01S15/8925 , G01S7/5208
Abstract: An ultrasonic probe including: a plurality of transducers; a plurality of low-noise amplifier circuits individually corresponding to the plurality of transducers, the plurality of low-noise amplifier circuits having a variable resistor feedback unit making a resistance value variable by an electrical signal inputted to a control terminal; and a control circuit; wherein the control circuit has a dummy circuit generating a bias voltage of a feedback unit of the low-noise amplifier circuit, and an adding circuit outputting an added signal of a bias voltage by the dummy circuit and a control signal increasing or decreasing with a lapse of time; and the plurality of low-noise amplifier circuits input an output of the adding circuit to the control terminal of the variable resistor feedback unit to perform variable control on a gain of the low-noise amplifier circuit.
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公开(公告)号：US11357476B2
公开(公告)日：2022-06-14
申请号：US16361406
申请日：2019-03-22
Applicant: Hitachi, Ltd.
Inventor： Yutaka Igarashi , Shinya Kajiyama , Yohei Nakamura , Kengo Imagawa , Kazuhiro Amino , Takayuki Iwashita
IPC: A61B8/00 , B06B1/02 , B06B3/00 , H03F3/45 , A61B8/08 , G01S7/52 , A61B8/13 , A61B8/06 , G01S15/89
Abstract: Provided is a probe which transmits an ultrasonic wave to a diagnostic site and receives a reception signal which is a reflected wave. The probe includes: a plurality of transducers; a plurality of low-noise amplifying circuits respectively corresponding to the plurality of transducers; and a single differential converter which converts a control signal rising with the elapse of time to a first bias signal rising with the elapse of time and a second bias signal falling with the elapse of time to control the plurality of low-noise amplifying circuits, and the low-noise amplifying circuit includes: an attenuator which attenuates an electric signal from the transducer; a first amplifying circuit which sets the first bias signal as a bias and amplifies an output signal of the attenuator to be gradually increased with the elapse of time; a second amplifying circuit which sets the second bias signal as a bias and amplifies the output signal of the attenuator to be gradually reduced with the elapse of time; and a subtractor which subtracts an output of the first amplifying circuit and an output of the second amplifying circuit.
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公开(公告)号：US11284859B2
公开(公告)日：2022-03-29
申请号：US16361406
申请日：2019-03-22
Applicant: Hitachi, Ltd.
Inventor： Yutaka Igarashi , Shinya Kajiyama , Yohei Nakamura , Kengo Imagawa , Kazuhiro Amino , Takayuki Iwashita
IPC: A61B8/00 , B06B1/02 , B06B3/00 , H03F3/45 , A61B8/08 , G01S7/52 , A61B8/13 , A61B8/06 , G01S15/89
Abstract: Provided is a probe which transmits an ultrasonic wave to a diagnostic site and receives a reception signal which is a reflected wave. The probe includes: a plurality of transducers; a plurality of low-noise amplifying circuits respectively corresponding to the plurality of transducers; and a single differential converter which converts a control signal rising with the elapse of time to a first bias signal rising with the elapse of time and a second bias signal falling with the elapse of time to control the plurality of low-noise amplifying circuits, and the low-noise amplifying circuit includes: an attenuator which attenuates an electric signal from the transducer; a first amplifying circuit which sets the first bias signal as a bias and amplifies an output signal of the attenuator to be gradually increased with the elapse of time; a second amplifying circuit which sets the second bias signal as a bias and amplifies the output signal of the attenuator to be gradually reduced with the elapse of time; and a subtractor which subtracts an output of the first amplifying circuit and an output of the second amplifying circuit.
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