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公开(公告)号：US20200077979A1
公开(公告)日：2020-03-12
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
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：US20200022677A1
公开(公告)日：2020-01-23
申请号：US16361528
申请日：2019-03-22
Applicant: Hitachi, Ltd.
Inventor： Shinta TAKANO , Kazuhiro AMINO , Hiroshi KAKITA
Abstract: A plurality of transmission and reception circuits are connected to a plurality of vibration elements. The transmission and reception circuit includes a basic delay circuit and a fine delay circuit. The basic delay circuit delays a transmission signal and a reception signal for sub beamforming. The fine delay circuit is configured to be capable of performing delay finer than that of the basic delay circuit. A quantized delay error is compensated for by the fine delay circuit at the time of transmission.
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公开(公告)号：US20200289092A1
公开(公告)日：2020-09-17
申请号：US16646766
申请日：2018-09-26
Applicant: Hitachi, Ltd.
Inventor： Toru YAZAKI , Kazuhiro AMINO
Abstract: An ultrasonic imaging apparatus includes a plurality of transducers that transmit ultrasonic waves and a transmission unit that supplies drive signals to the plurality of transducers. An amplitude control voltage generation unit and a transmission circuit unit are connected to a common voltage power supply. An amplitude control voltage generation unit receives an output voltage of the voltage power supply and an attenuation degree setting signal instructing an attenuation degree of the drive signal for each of the transducers for weighting of the drive signal, and generates an amplitude control voltage corresponding to a voltage obtained by attenuating the output voltage by the attenuation degree. The output voltage of the voltage power supply is reduced to a voltage corresponding to the amplitude control voltage, and a drive signal having a predetermined waveform is generated whose amplitude is the voltage after the reduction for each of the transducers.
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公开(公告)号：US20190328369A1
公开(公告)日：2019-10-31
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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