Patents Assigned to Nihon Dempa Kogyo Co., Ltd.
  • Publication number: 20210135650
    Abstract: A piezoelectric device includes a container and an AT-cut crystal element. The AT-cut crystal element has at least one side surface intersecting with a Z?-axis of the crystallographic axis of the crystal constituted of three surfaces. The first surface is a surface equivalent to a surface formed by rotating the principal surface by 4°±3.5° with an X-axis of the crystal as a rotation axis. The second surface is a surface equivalent to a surface formed by rotating the principal surface by ?57°±5° with the X-axis. The third surface is a surface equivalent to a surface formed by rotating the principal surface by ?42°±5° with the X-axis. When two corner portions on a side of a second side opposed to the first side of the AT-cut crystal element are viewed in plan view, each of the two corner portions have an approximately right angle.
    Type: Application
    Filed: October 27, 2020
    Publication date: May 6, 2021
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: KENJI SHIMAO, Tetsuya WATANABE, Koji TOSHIKAWA, Hirokazu IWATA
  • Patent number: 10992260
    Abstract: In an oscillator device that outputs a frequency signal based on an oscillation frequency of a crystal resonator and a frequency setting value, a frequency difference detector that obtains a difference value corresponding to a frequency difference between the output frequency of the oscillator device and an external clock signal and a temperature detector are disposed. An aging coefficient and a temperature characteristic coefficient are obtained based on a secular change of the difference value obtained in the frequency difference detector and a secular change of the detected temperature during a period where the external clock signal is obtained. Furthermore, a frequency correction value is calculated using the aging coefficient and the temperature characteristic coefficient during a holdover period, and the frequency correction value is added to the frequency setting value.
    Type: Grant
    Filed: March 25, 2019
    Date of Patent: April 27, 2021
    Assignee: NIHON DEMPA KOGYO CO., LTD.
    Inventor: Tsukasa Kobata
  • Publication number: 20210104655
    Abstract: To standardize a voltage regulator configured to regulate a voltage for regulating a temperature of a heat regulation mechanism without the heat regulation mechanism of a sensing sensor in a sensing device that includes the heat regulation mechanism to regulate a temperature of a piezoelectric resonator corresponding to a voltage and uses the sensing sensor to cause the sensing object to adsorb to and desorb from the piezoelectric resonator by increase and decrease of the temperature. A drive voltage is regulated to regulate an amplification factor of a heat regulation voltage input to a drive voltage regulator 73 that regulates the temperature of the heat regulation mechanism corresponding to the type of a sensing sensor 2 connected to a device main body 3.
    Type: Application
    Filed: March 25, 2019
    Publication date: April 8, 2021
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Yuki YANAGISAWA, Hiroyuki KUKITA
  • Publication number: 20210105000
    Abstract: A substantially rectangular pedestal for mounting a blank is provided, wherein angled portions at four corners of the main body of the pedestal is formed in a shape that is cut out obliquely.
    Type: Application
    Filed: September 15, 2020
    Publication date: April 8, 2021
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventor: Takafumi SAITOH
  • Publication number: 20210100119
    Abstract: A pedestal on which a beveled blank is mounted is provided with a recess portion and an edge portion. The recess portion is provided in a central part of a surface of a pedestal body of the pedestal. The edge portion is adjacent to the recess portion to which the blank is fixed. The recess portion has a length in the short side direction of the pedestal body longer than that of the short side of the blank.
    Type: Application
    Filed: September 24, 2020
    Publication date: April 1, 2021
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventor: Tomonori ABE
  • Patent number: 10931235
    Abstract: A sensing sensor includes an oscillator circuit, a base, a connection portion, and a temperature changing unit. The oscillator circuit oscillates the piezoelectric resonator. The base includes a base main body in which a depressed portion is provided and a lid portion at one side, supports the piezoelectric resonator at another side, and is for taking the oscillation frequency to an outside of the sensing sensor. The depressed portion houses the oscillator circuit. The lid portion covers the depressed portion. The connection portion is disposed at the one side of the base and connected to a cooling mechanism for cooling the base from the one side. The temperature changing unit is interposed between the piezoelectric resonator and the base, so as to cool and heat the piezoelectric resonator and transfer a heat radiated for cooling the piezoelectric resonator from the other side of the base to the one side.
    Type: Grant
    Filed: February 26, 2020
    Date of Patent: February 23, 2021
    Assignee: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Yuki Yanagisawa, Hiroyuki Kukita, Shohei Nakagawa
  • Publication number: 20210036657
    Abstract: In an oscillator device that outputs a frequency signal based on an oscillation frequency of a crystal resonator and a frequency setting value, a frequency difference detector that obtains a difference value corresponding to a frequency difference between the output frequency of the oscillator device and an external clock signal and a temperature detector are disposed. An aging coefficient and a temperature characteristic coefficient are obtained based on a secular change of the difference value obtained in the frequency difference detector and a secular change of the detected temperature during a period where the external clock signal is obtained. Furthermore, a frequency correction value is calculated using the aging coefficient and the temperature characteristic coefficient during a holdover period, and the frequency correction value is added to the frequency setting value.
    Type: Application
    Filed: March 25, 2019
    Publication date: February 4, 2021
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventor: Tsukasa KOBATA
  • Publication number: 20200408724
    Abstract: To provide a technique for expanding a measurement dynamic range and performing a stable detection in a sensing sensor using a crystal resonator. A spacer is disposed between an oscillator circuit that oscillates a crystal resonator and a base body that cools an oscillator circuit to a cryogenic temperature, and an oscillator circuit board includes a heater resistor that heats the oscillator circuit. Therefore, the temperature of the oscillator circuit that does not fall below a functional limit temperature and is a low temperature as much as possible can be provided. A negative resistance of the oscillator circuit can be increased, the measurement dynamic range can be expanded, and the crystal resonator can be stably oscillated.
    Type: Application
    Filed: March 6, 2019
    Publication date: December 31, 2020
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Hiroyuki KUKITA, Tsuyoshi SHIOBARA
  • Patent number: 10873315
    Abstract: A piezoelectric vibrating piece includes a piezoelectric substrate and excitation electrodes. The excitation electrode includes a main thickness portion and an inclined portion, the main thickness portion has a constant thickness, the inclined portion is formed on a peripheral area of the main thickness portion, the inclined portion gradually decrease in thickness from a part contacting the main thickness portion toward an outermost periphery of the excitation electrode. The inclined portion has a width as an inclination width in a length of 0.84 times or more and 1.37 times or less of a first flexural wavelength and 2.29 times or more and 3.71 times or less of a second flexural wavelength, the first flexural wavelength is a wavelength of a flexure vibration at a fundamental wave of the thickness-shear vibration, the second flexural wavelength is a wavelength of a flexure vibration at a third harmonic of the thickness-shear vibration.
    Type: Grant
    Filed: January 11, 2018
    Date of Patent: December 22, 2020
    Assignee: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Shigetaka Kaga, Kazuhiro Hirota
  • Patent number: 10868548
    Abstract: A PLL device includes a voltage control oscillation unit, an analog/digital converter, a quadrature demodulation unit, a comparison signal output unit, a phase difference detection unit, a loop filter, and a digital/analog converter. The quadrature demodulation unit quadrature-demodulates the digital feedback signal to obtain an in-phase component (I component) and a quadrature-phase component (Q component). The comparison signal has a set frequency of the output signal when the feedback signal is the output signal and has a frequency obtained by dividing the set frequency by the dividing number when the feedback signal is the frequency division signal. The phase difference detection unit obtains a phase difference between the digital feedback signal and the digital comparison signal based on the I component and the Q component of the digital feedback signal and the I component and an Q component of a comparison signal.
    Type: Grant
    Filed: April 22, 2020
    Date of Patent: December 15, 2020
    Assignee: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Tsukasa Kobata, Kazuo Akaike
  • Patent number: 10859686
    Abstract: An outer case for an ultrasonic probe that houses a module of the ultrasonic probe is provided. The outer case includes a grip case gripped by a user and a head case that engages with the grip case. The grip case has a first engaging portion where one or a plurality of convex portions are disposed. The head case has a second engaging portion where one or a plurality of depressed portions are disposed at positions where the one or plurality of depressed portions engage with the one or plurality of convex portions. The convex portion and the depressed portion are engaged to be locked.
    Type: Grant
    Filed: September 20, 2018
    Date of Patent: December 8, 2020
    Assignee: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Yasunobu Hasegawa, Kazuhiko Komiyama
  • Publication number: 20200378924
    Abstract: A sensing device that senses a substance to be sensed as a gas by causing a piezoelectric resonator to adsorb the substance to be sensed, includes: a substrate, a thermoelectric element unit, a support plate, and a base portion. A sensing module unit in which a substrate, a thermoelectric element unit, and a support plate are integrated is removably disposed to a base portion that performs at least one of heat supply and heat dissipation to the thermoelectric element unit.
    Type: Application
    Filed: May 26, 2020
    Publication date: December 3, 2020
    Applicants: NIHON DEMPA KOGYO CO., LTD., JAPAN AEROSPACE EXPLORATION AGENCY
    Inventors: Hiroyuki KUKITA, Tsuyoshi SHIOBARA, Yuki YANAGISAWA, Shohei NAKAGAWA, Eiji MIYAZAKI, Yuta TSUCHIYA
  • Patent number: 10840882
    Abstract: A crystal unit includes an AT-cut crystal element that has a planar shape in a rectangular shape and a part as a thick portion. The crystal element includes a first end portion, a depressed portion, the thick portion, and a second end portion in this order from a side of one short side in viewing a cross section taken along a longitudinal direction near a center of the short side. The depressed portion is a depressed portion disposed from the thick portion toward the first end portion side, depressed with a predetermined angle ?a and subsequently bulged, and connected to the first end portion.
    Type: Grant
    Filed: April 23, 2019
    Date of Patent: November 17, 2020
    Assignee: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Koji Toshikawa, Shinobu Yoshida, Hirokazu Iwata, Tetsuya Watanabe, Kazuhiro Hirota, Yoshiro Teshima
  • Publication number: 20200343895
    Abstract: A PLL device includes a voltage control oscillation unit, an analog/digital converter, a quadrature demodulation unit, a comparison signal output unit, a phase difference detection unit, a loop filter, and a digital/analog converter. The quadrature demodulation unit quadrature-demodulates the digital feedback signal to obtain an in-phase component (I component) and a quadrature-phase component (Q component). The comparison signal has a set frequency of the output signal when the feedback signal is the output signal and has a frequency obtained by dividing the set frequency by the dividing number when the feedback signal is the frequency division signal. The phase difference detection unit obtains a phase difference between the digital feedback signal and the digital comparison signal based on the I component and the Q component of the digital feedback signal and the I component and an Q component of a comparison signal.
    Type: Application
    Filed: April 22, 2020
    Publication date: October 29, 2020
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Tsukasa KOBATA, Kazuo AKAIKE
  • Patent number: 10819307
    Abstract: A crystal unit includes an AT-cut crystal element that has a planar shape in a rectangular shape and a part as a thick portion. The crystal element includes a first end portion, a first depressed portion, the thick portion, a second depressed portion, and a second end portion in an order from a side of one short side in viewing a cross section taken along a longitudinal direction near a center of the short side. The first depressed portion is a depressed portion disposed from the thick portion toward the first end portion side, depressed with a predetermined angle ?a and subsequently bulged, and connected to the first end portion. The second depressed portion is a depressed portion disposed from the thick portion toward the second end portion side, depressed with a predetermined angle ?b and subsequently bulged, and connected to the second end portion.
    Type: Grant
    Filed: August 8, 2018
    Date of Patent: October 27, 2020
    Assignee: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Yoshiharu Sato, Tetsuya Watanabe, Hirokazu Iwata, Shinobu Yoshida
  • Publication number: 20200336128
    Abstract: A quartz crystal device includes a package and a pedestal. The package includes a base plate on which a metal pattern is provided. A crystal element is mounted to the pedestal. The pedestal is adhered to the metal pattern with a conductive adhesive. The pedestal includes a main body, two connection portions, two clearance portions, a mounting portion, and arm portions. The two connection portions are provided along long sides of the main body. The two clearance portions are provided along the long sides. The arm portions are provided on four corners of the main body to connect the mounting portion to the connection portions. The connection portion of the pedestal and the metal pattern are adhered with the conductive adhesive dividedly applied to a plurality of positions on the metal pattern of the base plate and subsequently integrated.
    Type: Application
    Filed: March 26, 2020
    Publication date: October 22, 2020
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Tomonori ABE, Takafumi SAITOH
  • Patent number: 10804876
    Abstract: A piezoelectric vibrating piece includes a piezoelectric substrate, a first excitation electrode, and a second excitation electrode. The piezoelectric substrate is formed into a flat plate shape and vibrates in a thickness-shear vibration mode. The first excitation electrode is formed on one principal surface of the piezoelectric substrate. The second excitation electrode is formed on another principal surface of the piezoelectric substrate. The first excitation electrode is formed to entirely have an identical thickness. The second excitation electrode has a main thickness portion and an inclined portion. The main thickness portion has a constant thickness. The inclined portion is formed in a peripheral area of the main thickness portion and gradually decreases in thickness from a portion in contact with the main thickness portion to an outermost periphery of the second excitation electrode. The main thickness portion has a thickness larger than the thickness of the first excitation electrode.
    Type: Grant
    Filed: December 4, 2017
    Date of Patent: October 13, 2020
    Assignee: NIHON DEMPA KOGYO CO., LTD.
    Inventor: Shigetaka Kaga
  • Patent number: 10797216
    Abstract: A piezoelectric device includes a piezoelectric vibrating piece, a container, and a lid. The piezoelectric vibrating piece is bevel processed and has a bevel surface at one end of the piezoelectric vibrating piece. Thea container holds the piezoelectric vibrating piece with the bevel surface at the one end of the piezoelectric vibrating piece. The container has a connection pad at a holding region of the container and a pillow portion at a region corresponding to the other end of the piezoelectric vibrating piece. The lid member seals the container. The connection pad is buried in the container at the holding region in a state of a flat surface with a surface of the container and in a state where the surface of the connection pad is exposed. The piezoelectric vibrating piece is spanned between the surface of the connection pad and a top surface of the pillow portion.
    Type: Grant
    Filed: January 5, 2018
    Date of Patent: October 6, 2020
    Assignee: NIHON DEMPA KOGYO CO., LTD.
    Inventor: Shuichi Mizusawa
  • Publication number: 20200287522
    Abstract: A surface acoustic wave filter includes a longitudinal mode resonator type first filter portion, a longitudinal mode resonator type second filter portion, an input terminal, and an output terminal. Assuming a wavelength of a frequency propagating through the first filter portion is defined as ?, a distance between a center of a width of an electrode finger closest to the output side IDT electrode and a center of a width of an electrode finger closest to the input side IDT electrode is equal to or more than 0.57?. The electrode finger closest to the output side IDT electrode is closest among electrode fingers that constitute the input side IDT electrode and are arranged in the propagation direction, and the electrode finger closest to the input side IDT electrode is closest among electrode fingers that constitute the output side IDT electrode and are arranged in the propagation direction.
    Type: Application
    Filed: March 4, 2020
    Publication date: September 10, 2020
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventor: RYUJI KAJIHARA
  • Patent number: 10771038
    Abstract: A crystal unit includes an AT-cut crystal element that has a planar shape in a rectangular shape and a part as a thick portion. The crystal element includes a first end portion, a first depressed portion, the thick portion, a second depressed portion, and a second end portion in this order from a side of one short side, in viewing a cross section taken along a longitudinal direction near a center of the short side. The first depressed portion is a depressed portion disposed from the thick portion toward the first end portion side, depressed with a predetermined angle ?a and subsequently bulged, and connected to the first end portion. The second depressed portion is a depressed portion disposed from the thick portion toward the second end portion side, depressed with a predetermined angle ?b and subsequently bulged, and connected to the second end portion.
    Type: Grant
    Filed: April 23, 2019
    Date of Patent: September 8, 2020
    Assignee: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Koji Toshikawa, Shinobu Yoshida, Hirokazu Iwata