Patents by Inventor Toru Araki

Toru Araki 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: 6516069
    Abstract: A large-time-constant microphone filter which contains resistance and capacitance as its constituent and can be formed in the same semiconductor chip as a microphone unit is achieved, which results in downsizing and cost reduction of the microphone unit. A transistor of a current mirror circuit is used as a resistance of a microphone filter, utilizing a differential resistance produced by a channel length modulation effect of the transistor or an Early effect. When variations in the drain-source voltage of the transistor occur, the drain-source current of the transistor slightly varies in linear characteristics and the transistor serves a high value of resistance. Being a current mirror circuit, the microphone filter is resistant to characteristic variations due to temperature changes and can be formed in a semiconductor chip without a significant increase in chip area.
    Type: Grant
    Filed: July 5, 2000
    Date of Patent: February 4, 2003
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takanobu Takeuchi, Toru Araki
  • Publication number: 20030016054
    Abstract: A high-potential side power device driving circuit has a clock signal generation circuit generating the so-called internal clock signal by outputting a pulse in a constant cycle for driving NMOS transistors and an iterative pulse generation circuit monitoring the state of an external input signal in synchronization with an output signal of the clock signal generation circuit, receiving a pulsing input signal generated with reference to a ground potential and generating pulsing ON and OFF signals. Thus provided is a level shifting circuit capable of preventing a power device from a malfunction also when a dv/dt transient signal is supplied with time difference.
    Type: Application
    Filed: July 17, 2002
    Publication date: January 23, 2003
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Kazuaki Okamoto, Toru Araki
  • Publication number: 20030001630
    Abstract: As devices are often different in the characteristics from one another, semiconductor chips based on the devices have discrepancies in the performance.
    Type: Application
    Filed: May 7, 2002
    Publication date: January 2, 2003
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Hiroshi Sakata, Toru Araki
  • Patent number: 6194678
    Abstract: A pressure switch with improved sealing of an airtight chamber, and improved electrical characteristics reducing chattering, increasing response rate, and minimizing the pressure necessary for activation. The pressure switch includes an upper substrate with a diaphragm readily deformed by an applied stress, a lower substrate overlapped with the upper substrate to form the airtight chamber, a contact electrically switched in response to the deformation of the diaphragm, and a sealing member continuously surrounding the airtight chamber, disposed between the first and second substrate, and hermetically sealing the airtight chamber.
    Type: Grant
    Filed: May 9, 2000
    Date of Patent: February 27, 2001
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Eiji Yoshikawa, Masahiro Tsugai, Toru Araki
  • Patent number: 6050146
    Abstract: To obtain a pressure detection apparatus capable of changing output characteristics in a large area and changing a received pressure range without largely changing the apparatus in design.
    Type: Grant
    Filed: June 16, 1997
    Date of Patent: April 18, 2000
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hiroshi Nakamura, Seiki Kodama, Toru Araki, Susumu Nagano
  • Patent number: 5822369
    Abstract: A sensor device includes a voltage-to-pulse-number converter having a timing controller. When power is supplied to the converter from a power circuit through a power line, a timer circuit inhibits itself from performing a control operation until operations of a sensor and an amplifier become stable. After a predetermined period of time has passed, the inhibition of the controls is canceled. Then, an analog-to-digital (A-D) conversion of an output of the amplifier by the A-D converter is performed. Subsequently, a counter counts down from a value obtained from the A-D conversion. When the output of the counter becomes 0, the operation of the counter is stopped. Clock signals used for the operation of the counter are input to the pulse output circuit which is enabled only when the counter operates. Thereby, the timing controller outputs to an event counter a pulse signal having a number of pulses proportional to an output of the sensor. The sensor device obtains high precision data.
    Type: Grant
    Filed: August 28, 1995
    Date of Patent: October 13, 1998
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Toru Araki
  • Patent number: 5808429
    Abstract: A method of controlling operation of a DC motor including the steps of detecting the level of acceleration caused by the rotation of the output shaft of the DC motor; determining the square root of the detected level of acceleration; and supplying the DC motor with a driving voltage which is determined in accordance with the difference between the square root of the acceleration and a voltage command.
    Type: Grant
    Filed: April 6, 1993
    Date of Patent: September 15, 1998
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Toru Araki
  • Patent number: 5612488
    Abstract: A semiconductor acceleration system for detecting acceleration by outputting an electrical signal includes a diagnostic circuit for detecting failures in an output amplifier of the system. The system includes strain gauge resistors on a semiconductor substrate and connected in a bridge circuit. The output terminals of the bridge circuit are connected to an output amplifier. The diagnostic circuit includes two constant current sources producing different constant current flows and respectively connected to the two output terminals of the bridge circuit. When a switch is closed connecting the constant current sources to ground so that the constant currents flow through two of the strain gauge resistors, the output signal of the amplifier is observed. The output signal with the switch open and closed discloses the existence of a fault in the output amplifier circuit and the location of that fault.
    Type: Grant
    Filed: July 26, 1995
    Date of Patent: March 18, 1997
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Masahiro Yamamoto, Toru Araki
  • Patent number: 5606128
    Abstract: A semiconductor acceleration detecting device provided with a pedestal electrically and mechanically connected to an electrode mounted on a base with an electrically conductive adhesive, a semiconductor chip electrically and mechanically connected to the pedestal with an electrically conductive adhesive like a cantilever, and a strain gauge for detecting deformation of the semiconductor chip due to an applied acceleration. Current used for detecting detachment flows from the electrode into a wire connected to a grounding terminal through the pedestal and the semiconductor chip. Moreover, a detachment between the base and the pedestal or between the pedestal and the semiconductor chip is sensed by detecting whether the current flows normally. Thereby, erroneous acceleration of the object can be prevented from being measured.
    Type: Grant
    Filed: December 26, 1995
    Date of Patent: February 25, 1997
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Toru Araki
  • Patent number: 5559408
    Abstract: A method of controlling operation of a DC motor including the steps of detecting the level of acceleration caused by the rotation of the output shaft of the DC motor; determining the square root of the detected level of acceleration; and supplying the DC motor with a driving voltage which is determined in accordance with the difference between the square root of the acceleration and a voltage command.
    Type: Grant
    Filed: November 21, 1995
    Date of Patent: September 24, 1996
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Toru Araki
  • Patent number: 5493909
    Abstract: The present invention is directed to a method of and an apparatus for detecting an angular velocity and a rotation angle of a rotary member. In the present invention, first and second accelerations at first and second points of the rotary member are detected, respectively. The first and second accelerations are added, while the first acceleration is subtracted from the second acceleration. From the added and subtracted values, then, an angular velocity and a rotary angle of the rotary member are calculated.
    Type: Grant
    Filed: April 1, 1994
    Date of Patent: February 27, 1996
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Toru Araki
  • Patent number: 5473253
    Abstract: A semiconductor sensor apparatus includes a resistor connected between an output terminal and a power source terminal or a ground terminal of the semiconductor sensor apparatus while an output voltage corresponding to a physical parameter measured by the apparatus is generated. An output voltage limiting circuit in the semiconductor apparatus, during normal operation, limits the output voltage to values between an upper limit and a lower limit. When at least one of the power source terminal, the output terminal, and a ground terminal is open, the limiting circuit causes the output voltage to fall outside of the predetermined range. Thus, the disconnection of any of the power source terminal, the output terminal, and the ground terminal can be detected from the output voltage.
    Type: Grant
    Filed: January 7, 1994
    Date of Patent: December 5, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Toru Araki
  • Patent number: 5418442
    Abstract: The present invention is directed to a method of and an apparatus for detecting an angular velocity and a rotation angle of a rotary member and for controlling a motor disposed to drive the rotary member. In the present invention, first and second accelerations at first and second points of the rotary member are detected, respectively. The first and second accelerations are added. From the added value an angular velocity of the rotary member is calculated. A signal is generated representing the angular velocity and compared with predetermined control instructions. A control input is generated based upon this comparison, and the motor is controlled based upon the control input.
    Type: Grant
    Filed: April 1, 1994
    Date of Patent: May 23, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Toru Araki
  • Patent number: 5408885
    Abstract: A pressure detecting circuit compensating for temperature dependency of a zero point output voltage of a semiconductor pressure sensor. A differential amplifier circuit in a signal processing circuit of the semiconductor pressure sensor includes two transistors. Emitter currents in the two transistors are different in accordance with the temperature dependency of the zero point output voltage of a bridge circuit of a pressure detector. As a result, a difference will arise between the base-emitter voltages of the two transistors. The temperature dependency of the zero point output voltage of the bridge circuit is compensated for by the temperature dependency of the voltage differences of the base-emitter voltages.
    Type: Grant
    Filed: April 6, 1993
    Date of Patent: April 25, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Toru Araki
  • Patent number: 5396795
    Abstract: The semiconductor flow rate detector comprises a semiconductor chip having sensor elements on its surface, leads connected to connecting terminals of the semiconductor chip, and a resin base covering junctions between the leads and the connecting terminals of the semiconductor chip and integrally holding them.
    Type: Grant
    Filed: November 24, 1992
    Date of Patent: March 14, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Toru Araki
  • Patent number: 5384549
    Abstract: An amplifier circuit having a stabilized power supply circuit as a power source is arranged to ensure that, when the output is short-circuited to a power supply line, the amplifier circuit and the stabilized power supply circuit are protected, the output from the stabilized power supply circuit is stably maintained and the short-circuit failure can be distinguished from use of the amplifier circuit. A first transistor forming a common-emitter circuit constitutes an output section of the amplifier circuit. A second transistor having the same polarity as that of the first transistor has its collector and base connected to each other and to the base of the first transistor. The emitters of the first and second transistors are connected to each other. The emitter of a third transistor forming an emitter-follower circuit is connected to the point of connection between the collector and the base of the second transistor. A current limiter circuit is connected to the collector of the third transistor.
    Type: Grant
    Filed: November 30, 1993
    Date of Patent: January 24, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Toru Araki
  • Patent number: 5209120
    Abstract: A semiconductor pressure-detecting apparatus includes a semiconductor chip having a diaphragm and a frame molded within a resin with the diaphragm exposed. A reference pressure chamber may be provided between the diaphragm and the frame. Since the diaphragm is exposed, a medium, the pressure of which is to be measured, easily contacts the diaphragm. Therefore, if the stem is connected to a case containing the medium, a high pressure can be measured.
    Type: Grant
    Filed: October 2, 1991
    Date of Patent: May 11, 1993
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Toru Araki