Patents by Inventor Takehiro Yamamoto

Takehiro Yamamoto 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).

  • Publication number: 20160218718
    Abstract: A semiconductor circuit device includes an oscillation circuit, an output circuit that outputs a signal output from the oscillation circuit, a temperature sensing element, a characteristic adjustment circuit that adjusts characteristics of the oscillation circuit on the basis of a signal output from the temperature sensing element, a first wiring via which power is supplied to the output circuit, and a second wiring via which a reference voltage is supplied to the output circuit in which at least one of the first wiring and the second wiring overlaps the temperature sensing element in a plan view.
    Type: Application
    Filed: January 12, 2016
    Publication date: July 28, 2016
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Takehiro YAMAMOTO
  • Publication number: 20160218719
    Abstract: A semiconductor circuit device includes an oscillation circuit, an output circuit that receives a signal output from an oscillation circuit and outputs an oscillation signal, a temperature sensing element, a characteristic adjustment circuit that adjusts characteristics of the oscillation circuit on the basis of a signal output from the temperature sensing element, and a first connection terminal that is electrically connected to the output circuit and via which the oscillation signal is output, in which a distance between the output circuit and the first connection terminal is shorter than a distance between the temperature sensing element and the first connection terminal in a plan view.
    Type: Application
    Filed: January 12, 2016
    Publication date: July 28, 2016
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Takehiro YAMAMOTO
  • Patent number: 9312812
    Abstract: An oscillation circuit includes a terminal XO which is connected to one end of a resonator, a terminal XI which is connected to the other end of the resonator, an oscillation unit which is electrically connected to the terminal XO and the terminal XI, a control voltage generation circuit, and a switch. The oscillation unit includes a variable capacitive element having one end which is connected to the terminal XO or the terminal XI. The switch controls electrical connection between the other end of the variable capacitive element and an output terminal of the control voltage generation circuit.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: April 12, 2016
    Assignee: Seiko Epson Corporation
    Inventors: Yosuke Itasaka, Masayuki Ishikawa, Takehiro Yamamoto, Akihiro Fukuzawa
  • Patent number: 9312809
    Abstract: An oscillator circuit includes a circuit for oscillation, a temperature compensated circuit, an output circuit, and an amplitude control circuit. The output circuit outputs an oscillation signal as a signal output from the circuit for oscillation is input. The amplitude control circuit includes an amplitude control portion which controls amplitude of the oscillation signal output by the output circuit, and a heat generation portion into which a DC current is input and which generates heat. The heat generation portion controls the input DC current based on operation states of the circuit for oscillation and the amplitude control portion.
    Type: Grant
    Filed: December 19, 2014
    Date of Patent: April 12, 2016
    Assignee: Seiko Epson Corporation
    Inventor: Takehiro Yamamoto
  • Patent number: 9246469
    Abstract: A manufacturing method of an oscillator is a manufacturing method of an oscillator which includes a vibrator and a semiconductor circuit device including an oscillation part connected to the vibrator and a control part to switch an operation mode between a normal mode in which the oscillation part performs an oscillation operation and an inspection mode in which characteristics of the vibrator are inspected, and the manufacturing method includes preparing the semiconductor circuit device in which the operation mode is set to the inspection mode, connecting the semiconductor circuit device and the vibrator electrically, and inspecting the characteristics of the vibrator which is in a state electrically connected to the semiconductor circuit device.
    Type: Grant
    Filed: November 10, 2014
    Date of Patent: January 26, 2016
    Assignee: Seiko Epson Corporation
    Inventors: Masayuki Ishikawa, Yosuke Itasaka, Takehiro Yamamoto, Akihiro Fukuzawa
  • Patent number: 9112512
    Abstract: A circuit device includes a current supply circuit adapted to supply an oscillation current, an oscillation circuit having an oscillation transistor for a resonator, and adapted to drive the resonator using the oscillation transistor based on an oscillation current from the current supply circuit, and a control section adapted to control the current supply circuit. If the oscillation circuit is set to an overdrive mode, the oscillation circuit drives the resonator with a higher drive power than the drive power in a normal mode.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: August 18, 2015
    Assignee: Seiko Epson Corporation
    Inventors: Masayuki Ishikawa, Takehiro Yamamoto
  • Patent number: 9106237
    Abstract: An oscillation circuit is connected to a resonator element (crystal resonator) and oscillates a resonator element to output an oscillation signal. The oscillation circuit includes an amplification element (inverter), and a set of variable capacitive elements having at least two variable capacitive elements, which are connected to an oscillation loop from an output to an input of the amplification element and the capacitance values thereof are controlled with potential differences between reference voltages and a variable control voltage. In each variable capacitive element of a set of variable capacitive elements, the common control voltage is applied to one terminal, and the reference voltage which differs between the variable capacitive elements is input to the other terminal.
    Type: Grant
    Filed: September 24, 2013
    Date of Patent: August 11, 2015
    Assignee: Seiko Epson Corporation
    Inventors: Masayuki Ishikawa, Takehiro Yamamoto, Yosuke Itasaka
  • Publication number: 20150180410
    Abstract: An oscillator circuit includes a circuit for oscillation, a temperature compensated circuit, an output circuit, and an amplitude control circuit. The output circuit outputs an oscillation signal as a signal output from the circuit for oscillation is input. The amplitude control circuit includes an amplitude control portion which controls amplitude of the oscillation signal output by the output circuit, and a heat generation portion into which a DC current is input and which generates heat. The heat generation portion controls the input DC current based on operation states of the circuit for oscillation and the amplitude control portion.
    Type: Application
    Filed: December 19, 2014
    Publication date: June 25, 2015
    Inventor: Takehiro YAMAMOTO
  • Patent number: 9065383
    Abstract: An oscillation circuit includes a first variable capacitance part which includes a first variable capacitance element whose capacitance is controlled on the basis of a potential difference between a first control voltage and a first reference voltage, and is connected to the oscillation circuit, a second variable capacitance part which includes a second variable capacitance element whose capacitance is controlled on the basis of a potential difference between a first control voltage and a second reference voltage, and is connected to the oscillation circuit.
    Type: Grant
    Filed: September 23, 2013
    Date of Patent: June 23, 2015
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Masayuki Ishikawa, Takehiro Yamamoto, Yosuke Itasaka
  • Publication number: 20150130547
    Abstract: A manufacturing method of an oscillator is a manufacturing method of an oscillator which includes a vibrator and a semiconductor circuit device including an oscillation part connected to the vibrator and a control part to switch an operation mode between a normal mode in which the oscillation part performs an oscillation operation and an inspection mode in which characteristics of the vibrator are inspected, and the manufacturing method includes preparing the semiconductor circuit device in which the operation mode is set to the inspection mode, connecting the semiconductor circuit device and the vibrator electrically, and inspecting the characteristics of the vibrator which is in a state electrically connected to the semiconductor circuit device.
    Type: Application
    Filed: November 10, 2014
    Publication date: May 14, 2015
    Inventors: Masayuki ISHIKAWA, Yosuke ITASAKA, Takehiro YAMAMOTO, Akihiro FUKUZAWA
  • Publication number: 20150123740
    Abstract: A semiconductor circuit device includes: a semiconductor substrate; and a first circuit block including an analog circuit as a component, a second circuit block including a digital circuit as a component, a connection pad, and a connection wire electrically connecting the connection pad with the first circuit block, all of which are arranged on the semiconductor substrate. The connection wire is provided so as not to overlap the second circuit block in a plan view.
    Type: Application
    Filed: November 6, 2014
    Publication date: May 7, 2015
    Inventors: Yosuke ITASAKA, Masayuki ISHIKAWA, Takehiro YAMAMOTO
  • Publication number: 20150116043
    Abstract: An oscillation circuit includes a terminal XO which is connected to one end of a resonator, a terminal XI which is connected to the other end of the resonator, an oscillation unit which is electrically connected to the terminal XO and the terminal XI, a control voltage generation circuit, and a switch. The oscillation unit includes a variable capacitive element having one end which is connected to the terminal XO or the terminal XI. The switch controls electrical connection between the other end of the variable capacitive element and an output terminal of the control voltage generation circuit.
    Type: Application
    Filed: October 29, 2014
    Publication date: April 30, 2015
    Inventors: Yosuke ITASAKA, Masayuki ISHIKAWA, Takehiro YAMAMOTO, Akihiro FUKUZAWA
  • Publication number: 20150116048
    Abstract: An oscillation circuit includes: an oscillation unit which includes a first terminal and a second terminal connected to a vibrator; a third terminal to which a ground potential is supplied; a fourth terminal which is electrically connected to the second terminal, and to which at least one of an AC voltage for driving the vibrator and a voltage for operating the oscillation unit is applied; and a first switching unit which switches modes of electrical connection between the first terminal and the third terminal.
    Type: Application
    Filed: October 28, 2014
    Publication date: April 30, 2015
    Inventors: Takehiro YAMAMOTO, Masayuki ISHIKAWA, Yosuke ITASAKA
  • Publication number: 20150116044
    Abstract: An oscillation circuit includes: an oscillation unit which includes a first terminal and a second terminal connected to a resonator, a third terminal, a fourth terminal to which at least one of a power supply potential and a signal for inspecting the resonator is applied, a first switching unit which switches modes of electrical connection between the first terminal and the third terminal, and a second switching unit which switches modes of electrical connection between the second terminal and the fourth terminal.
    Type: Application
    Filed: October 29, 2014
    Publication date: April 30, 2015
    Inventors: Yosuke ITASAKA, Masayuki ISHIKAWA, Takehiro YAMAMOTO, Akihiro FUKUZAWA
  • Publication number: 20140335420
    Abstract: There is provided a negative-electrode material for rechargeable batteries with a nonaqueous electrolyte which have a high charge/discharge capacity and excellent rate characteristics. The negative-electrode material for rechargeable batteries with a nonaqueous electrolyte comprises: carbon material having a carbon atom content of not less than 98.0% in terms of mass and a lattice spacing (d002) of not more than 3.370 angstroms in the C-axis direction; and a boron compound represented by general formula HxBOy wherein x represents a real number of 0 to 1.0; and y represents a real number of 1.5 to 3.0, wherein the boron compound is bonded to a portion of the carbon atoms of the carbon material.
    Type: Application
    Filed: November 20, 2012
    Publication date: November 13, 2014
    Inventors: Takehiro Yamamoto, Yohei Yagishita, Ryo Kurokawa, Jae-Seong Yeo, Jin Miyawaki, Isao Mochida, Seong-Ho Yoon
  • Publication number: 20140091865
    Abstract: An oscillation circuit is connected to a resonator element (crystal resonator) and oscillates a resonator element to output an oscillation signal. The oscillation circuit includes an amplification element (inverter), and a set of variable capacitive elements having at least two variable capacitive elements, which are connected to an oscillation loop from an output to an input of the amplification element and the capacitance values thereof are controlled with potential differences between reference voltages and a variable control voltage. In each variable capacitive element of a set of variable capacitive elements, the common control voltage is applied to one terminal, and the reference voltage which differs between the variable capacitive elements is input to the other terminal.
    Type: Application
    Filed: September 24, 2013
    Publication date: April 3, 2014
    Applicant: Seiko Epson Corporation
    Inventors: Masayuki ISHIKAWA, Takehiro YAMAMOTO, Yosuke ITASAKA
  • Publication number: 20140091868
    Abstract: An oscillation circuit includes a first variable capacitance part which includes a first variable capacitance element whose capacitance is controlled on the basis of a potential difference between a first control voltage and a first reference voltage, and is connected to the oscillation circuit, a second variable capacitance part which includes a second variable capacitance element whose capacitance is controlled on the basis of a potential difference between a first control voltage and a second reference voltage, and is connected to the oscillation circuit.
    Type: Application
    Filed: September 23, 2013
    Publication date: April 3, 2014
    Applicant: Seiko Epson Corporation
    Inventors: Masayuki Ishikawa, Takehiro Yamamoto, Yosuke Itasaka
  • Publication number: 20130257550
    Abstract: A circuit device includes a current supply circuit adapted to supply an oscillation current, an oscillation circuit having an oscillation transistor for a resonator, and adapted to drive the resonator using the oscillation transistor based on an oscillation current from the current supply circuit, and a control section adapted to control the current supply circuit. If the oscillation circuit is set to an overdrive mode, the oscillation circuit drives the resonator with a higher drive power than the drive power in a normal mode.
    Type: Application
    Filed: March 15, 2013
    Publication date: October 3, 2013
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Masayuki ISHIKAWA, Takehiro YAMAMOTO
  • Patent number: 8496534
    Abstract: In FIG. 2, a diameter Dd of drilling edges of a drill is selected smaller than a valley diameter d1 of a male thread of a tap portion, and an inner diameter D1 of a female thread is defined by the valley diameter d1 of the male thread. Therefore, a predetermined radial gap is formed between the male thread 30 formed by the tap portion and the drill. When a tap with the drill is reversely rotated to be pulled out from the female thread after cutting the female thread, the tap released from the restriction may deflectively displace in the diameter direction upon pulling out the male thread of the tap portion from the female thread. However, the drill hardly contacts with the female thread, so that the occurrence of the defective product due to the contact is suppressed.
    Type: Grant
    Filed: February 21, 2007
    Date of Patent: July 30, 2013
    Assignee: OSG Corporation
    Inventors: Jiro Osawa, Takehiro Yamamoto, Takayuki Nakajima
  • Patent number: 8427244
    Abstract: An oscillation circuit includes: an oscillator that includes a vibrator and outputs an oscillation signal; an F/V converter that converts the oscillation signal into a voltage corresponding to a frequency of the oscillation signal; and a memory circuit that stores frequency correcting information for correcting the frequency of the oscillation signal.
    Type: Grant
    Filed: February 28, 2011
    Date of Patent: April 23, 2013
    Assignee: Seiko Epson Corporation
    Inventors: Masayuki Ishikawa, Kenasku Isohata, Takehiro Yamamoto