Patents by Inventor Satoshi Hanazawa

Satoshi Hanazawa 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).

  • Patent number: 10219783
    Abstract: A transmission circuit for ultrasonic diagnosis includes a delay processing circuit that delays a transmission signal pattern and an operational circuit that calculates a delay time. A transmission timing for supplying the transmission signal pattern to a plurality of piezo electric elements corresponding to a plurality of channels is approximated by a multi-dimensional polynomial with locations of the plurality of piezo electric elements being variables so that the transmission timing becomes linear or arc-like. Coefficients in the multi-dimensional polynomial are supplied to the transmission circuit for ultrasonic diagnosis. The delay time in the delay processing circuit is determined by a first coefficient. The operational circuit calculates the delay time based on a second coefficient.
    Type: Grant
    Filed: February 23, 2016
    Date of Patent: March 5, 2019
    Assignee: ABLIC INC.
    Inventors: Hiroyasu Yoshizawa, Satoshi Hanazawa, Tatsuya Odawara, Na Li
  • Publication number: 20170150946
    Abstract: A transmission circuit for ultrasonic diagnosis includes a delay processing circuit that delays a transmission signal pattern and an operational circuit that calculates a delay time. A transmission timing for supplying the transmission signal pattern to a plurality of piezo electric elements corresponding to a plurality of channels is approximated by a multi-dimensional polynomial with locations of the plurality of piezo electric elements being variables so that the transmission timing becomes linear or arc-like. Coefficients in the multi-dimensional polynomial are supplied to the transmission circuit for ultrasonic diagnosis. The delay time in the delay processing circuit is determined by a first coefficient. The operational circuit calculates the delay time based on a second coefficient.
    Type: Application
    Filed: February 23, 2016
    Publication date: June 1, 2017
    Inventors: Hiroyasu YOSHIZAWA, Satoshi HANAZAWA, Tatsuya ODAWARA, Na LI
  • Patent number: 9337823
    Abstract: Provided is a switching circuit capable of transmitting a signal with large amplitude and large current while suppressing deterioration when a small-amplitude signal is transmitted. The switching circuit 100 includes a first terminal a, a second terminal b, a first switch 1, a second switch 2, a first separation switch 3a, and a second separation switch 3b. The first switch 1 connects the first terminal a and the second terminal b according to a control signal. The second switch 2 has a first node n1 and a second node n2, and connects between the nodes in synchronization with the first switch 1. The first separation switch 3a transmits a signal of the first node n1 to the second node n2 when an electric potential of the first node n1 is higher than that of the second node n2 by more than a predetermined electric potential.
    Type: Grant
    Filed: July 8, 2015
    Date of Patent: May 10, 2016
    Assignee: Hitachi, Ltd.
    Inventors: Na Li, Hiroyasu Yoshizawa, Satoshi Hanazawa, Shunsuke Kubota, Yoshihiro Hayashi
  • Patent number: 9331675
    Abstract: Provided is a transmission drive circuit which can reduce distortions of a transmission signal and transmission noise, and is isolable from a signal line. A transmission drive circuit 700 includes a drive transistor 10 and an isolation diode 31 connected between a node n1 coupled to a signal line SL commonly used to propagate a transmission signal and a reception signal and a power source line HVP, and further includes an isolation diode 32 and a drive transistor 20 connected between the node n1 and a voltage line HVM. Furthermore, the transmission drive circuit 700 includes a switch 41 connected between a node n2 between the drive transistor 10 and the isolation diode 31, and a node n4 of a ground voltage Vs, and a switch 43 connected between a node n3 between the drive transistor 20 and the isolation diode 32, and a node n4.
    Type: Grant
    Filed: July 29, 2015
    Date of Patent: May 3, 2016
    Assignee: Hitachi, Ltd.
    Inventors: Hiroyasu Yoshizawa, Satoshi Hanazawa, Nao Miyamoto
  • Publication number: 20160036418
    Abstract: Provided is a transmission drive circuit which can reduce distortions of a transmission signal and transmission noise, and is isolable from a signal line. A transmission drive circuit 700 includes a drive transistor 10 and an isolation diode 31 connected between a node n1 coupled to a signal line SL commonly used to propagate a transmission signal and a reception signal and a power source line HVP, and further includes an isolation diode 32 and a drive transistor 20 connected between the node n1 and a voltage line HVM. Furthermore, the transmission drive circuit 700 includes a switch 41 connected between a node n2 between the drive transistor 10 and the isolation diode 31, and a node n4 of a ground voltage Vs, and a switch 43 connected between a node n3 between the drive transistor 20 and the isolation diode 32, and a node n4.
    Type: Application
    Filed: July 29, 2015
    Publication date: February 4, 2016
    Inventors: Hiroyasu YOSHIZAWA, Satoshi HANAZAWA, Nao MIYAMOTO
  • Publication number: 20160020760
    Abstract: Provided is a switching circuit capable of transmitting a signal with large amplitude and large current while suppressing deterioration when a small-amplitude signal is transmitted. The switching circuit 100 includes a first terminal a, a second terminal b, a first switch 1, a second switch 2, a first separation switch 3a, and a second separation switch 3b. The first switch 1 connects the first terminal a and the second terminal b according to a control signal. The second switch 2 has a first node n1 and a second node n2, and connects between the nodes in synchronization with the first switch 1. The first separation switch 3a transmits a signal of the first node n1 to the second node n2 when an electric potential of the first node n1 is higher than that of the second node n2 by more than a predetermined electric potential.
    Type: Application
    Filed: July 8, 2015
    Publication date: January 21, 2016
    Inventors: Na LI, Hiroyasu YOSHIZAWA, Satoshi HANAZAWA, Shunsuke KUBOTA, Yoshihiro HAYASHI
  • Patent number: 8598939
    Abstract: A T/R switch applicable to an ultrasonograph and capable of transmitting a signal reflected from a living body over a wide band with low noise without causing erroneous operation of the switch or element destruction even when the potential of a transmission signal or reflected signal changes includes: a common source terminal commonly and serially coupling the source terminals of two MOS transistors; a common gate terminal commonly coupling the gate terminals of the two MOS transistors; a main switch, the drain terminals of which are connected to input/output terminals; and a floating voltage circuit which is connected to the common gate terminal and common source terminal, makes the common gate terminal potential follow, in phase, variation in the common source terminal potential, and sends a signal to turn the switch on or off to the common gate terminal.
    Type: Grant
    Filed: January 15, 2012
    Date of Patent: December 3, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Tetsuhiro Shimizu, Satoshi Hanazawa, Toshio Shinomiya, Hiroyasu Yoshizawa
  • Publication number: 20120249210
    Abstract: A T/R switch applicable to an ultrasonograph and capable of transmitting a signal reflected from a living body over a wide band with low noise without causing erroneous operation of the switch or element destruction even when the potential of a transmission signal or reflected signal changes includes: a common source terminal commonly and serially coupling the source terminals of two MOS transistors; a common gate terminal commonly coupling the gate terminals of the two MOS transistors; a main switch, the drain terminals of which are connected to input/output terminals; and a floating voltage circuit which is connected to the common gate terminal and common source terminal, makes the common gate terminal potential follow, in phase, variation in the common source terminal potential, and sends a signal to turn the switch on or off to the common gate terminal.
    Type: Application
    Filed: January 15, 2012
    Publication date: October 4, 2012
    Inventors: Tetsuhiro SHIMIZU, Satoshi HANAZAWA, Toshio SHINOMIYA, Hiroyasu YOSHIZAWA
  • Patent number: 8143924
    Abstract: There is provided a circuit whose output is free from high impedance to improve wrong transmission and waveform overshoot, realizing a semiconductor integrated circuit device in which plural channels is integrated with transmitter circuit as unit channel, in the transmitter circuit used in a medical ultrasound system and drives a transducer by voltage pulses having plural positive and negative electric potentials including ground potential. The transmitter circuit includes a conventional pulse generating circuit supplied with positive and negative voltage largest in absolute value, a P-channel analog switching pulse generating circuit supplied with positive voltage being the second largest therein, an N-channel analog switching pulse generating circuit supplied with negative voltage being the second largest, and an N-channel analog switching ground level damping circuit supplied with ground potential. The circuits are connected to output terminal.
    Type: Grant
    Filed: January 11, 2010
    Date of Patent: March 27, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Satoshi Hanazawa, Toshio Shinomiya, Hiroyasu Yoshizawa
  • Patent number: 7973573
    Abstract: A semiconductor integrated circuit having a plurality of ultrasound pulsers corresponding to a plurality of respective channels, and integrally formed on a small area. The ultrasound pulsers each include a MOSFET gate drive circuit in which an input voltage pulse is converted into a current pulse, and the current pulse is converted again into a voltage pulse on the basis of a high potential side voltage +HV, and a low potential side voltage ?HV, applied to a transducer drive circuit, and in which a voltage level shift in the input voltage pulse is attained, and a voltage pulse swing is generated by the MOSFET gate drive circuit on the basis of the high potential side voltage +HV, and the low potential side voltage ?HV. The MOSFET gate drive circuit is DC-coupled with the transducer drive circuit.
    Type: Grant
    Filed: February 4, 2010
    Date of Patent: July 5, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Satoshi Hanazawa, Hiroyasu Yoshizawa
  • Publication number: 20100214006
    Abstract: There is provided a circuit whose output is free from high impedance to improve wrong transmission and waveform overshoot, realizing a semiconductor integrated circuit device in which plural channels is integrated with transmitter circuit as unit channel, in the transmitter circuit used in a medical ultrasound system and drives a transducer by voltage pulses having plural positive and negative electric potentials including ground potential. The transmitter circuit includes a conventional pulse generating circuit supplied with positive and negative voltage largest in absolute value, a P-channel analog switching pulse generating circuit supplied with positive voltage being the second largest therein, an N-channel analog switching pulse generating circuit supplied with negative voltage being the second largest, and an N-channel analog switching ground level damping circuit supplied with ground potential. The circuits are connected to output terminal.
    Type: Application
    Filed: January 11, 2010
    Publication date: August 26, 2010
    Inventors: Satoshi HANAZAWA, Toshio Shinomiya, Hiroyasu Yoshizawa
  • Publication number: 20100137720
    Abstract: With an ultrasound pulser suitable for application to a medical ultrasound system, and so forth, a high voltage power supply of a transducer drive circuitry, on both high potential and low potential sides, is rendered variable in a range of 0 V on the order of ±200 V, thereby implementing a semiconductor integrated circuit wherein a plurality of the ultrasound pulsers corresponding to a plurality of channels, respectively, are integrally formed on a small area.
    Type: Application
    Filed: February 4, 2010
    Publication date: June 3, 2010
    Inventors: Satoshi HANAZAWA, Hiroyasu Yoshizawa
  • Patent number: 7692456
    Abstract: A semiconductor integrated circuit having a plurality of ultrasound pulsers corresponding to a plurality of respective channels, and integrally formed on a small area. The ultrasound pulsers each include a MOSFET gate drive circuit in which an input voltage pulse is converted into a current pulse, and the current pulse is converted again into a voltage pulse on the basis of a high potential side voltage +HV, and a low potential side voltage ?HV, applied to a transducer drive circuit, and in which a voltage level shift in the input voltage pulse is attained, and a voltage pulse swing is generated by the MOSFET gate drive circuit on the basis of the high potential side voltage +HV, and the low potential side voltage ?HV. The MOSFET gate drive circuit is DC-coupled with the transducer drive circuit.
    Type: Grant
    Filed: December 17, 2007
    Date of Patent: April 6, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Satoshi Hanazawa, Hiroyasu Yoshizawa
  • Patent number: 7518112
    Abstract: A radiation detection circuit having a multi-channel input used for radiation measurement and capable of canceling cross-talk noise generated from a logic circuit for controlling a channel and enabling low noise radiation measurement easily and precisely. The radiation detection circuit also generates an inverted signal for each of input/output signals needed for controlling its logic and cancels a noise charge generated by coupled capacity between a bonding wire (analog input side in IC package) for connecting its output to another radiation detection circuit and a bonding wire of each of input/output signals of the logic control circuit by generating an inverted noise charge with coupled capacity between the inverted signal and its output when in logic controlling, thereby suppressing the cross-talk noise generated by each of its input/output signals.
    Type: Grant
    Filed: January 23, 2007
    Date of Patent: April 14, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Takashi Matsumoto, Satoshi Hanazawa, Toshihiko Moriwaki, Masakazu Ishibashi, Naruaki Kiriki
  • Publication number: 20080238532
    Abstract: With an ultrasound pulser suitable for application to a medical ultrasound system, and so forth, a high voltage power supply of a transducer drive circuitry, on both high potential and low potential sides, is rendered variable in a range of 0 V on the order of ±200 V, thereby implementing a semiconductor integrated circuit wherein a plurality of the ultrasound pulsers corresponding to a plurality of channels, respectively, are integrally formed on a small area.
    Type: Application
    Filed: December 17, 2007
    Publication date: October 2, 2008
    Inventors: Satoshi Hanazawa, Hiroyasu Yoshizawa
  • Patent number: 7372330
    Abstract: A variable gain amplifier of such configuration that can yield continuously and log-linearly variable gains in relation to control voltage and, at the same time, that does not use an attenuator, an element which otherwise would entail cause of increased noise. The amplifier includes a plurality of gm amplifiers connected in parallel with input signal, exponential multipliers connected respectively to the gm amplifiers, a control section to vary the multiplication coefficient of the exponential multipliers according to the external gain control signal, and an I-V converter circuit to aggregate current output after multiplication and convert the aggregated current output to voltage. A continuously variable gain characteristic can be obtained without the use of an attenuator but by varying multiplication coefficient according to control voltage.
    Type: Grant
    Filed: July 12, 2006
    Date of Patent: May 13, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Hiroyasu Yoshizawa, Satoshi Hanazawa
  • Publication number: 20070228279
    Abstract: A radiation detection circuit having a multi-channel input used for radiation measurement and capable of canceling cross-talk noise generated from a logic circuit for controlling a channel and enabling low noise radiation measurement easily and precisely. The radiation detection circuit also generates an inverted signal for each of input/output signals needed for controlling its logic and cancels a noise charge generated by coupled capacity between a bonding wire (analog input side in IC package) for connecting its output to another radiation detection circuit and a bonding wire of each of input/output signals of the logic control circuit by generating an inverted noise charge with coupled capacity between the inverted signal and its output when in logic controlling, thereby suppressing the cross-talk noise generated by each of its input/output signals.
    Type: Application
    Filed: January 23, 2007
    Publication date: October 4, 2007
    Inventors: Takashi Matsumoto, Satoshi Hanazawa, Toshihiko Moriwaki, Masakazu Ishibashi, Naruaki Kiriki
  • Publication number: 20070075774
    Abstract: A variable gain amplifier of such configuration that can yield continuously and log-linearly variable gains in relation to control voltage and, at the same time, that does not use an attenuator, an element which otherwise would entail cause of increased noise. The amplifier includes a plurality of gm amplifiers connected in parallel with input signal, exponential multipliers connected respectively to the gm amplifiers, a control section to vary the multiplication coefficient of the exponential multipliers according to the external gain control signal, and an I-V converter circuit to aggregate current output after multiplication and convert the aggregated current output to voltage. A continuously variable gain characteristic can be obtained without the use of an attenuator but by varying multiplication coefficient according to control voltage.
    Type: Application
    Filed: July 12, 2006
    Publication date: April 5, 2007
    Inventors: Hiroyasu Yoshizawa, Satoshi Hanazawa