Quartz Patents (Class 310/361)
  • Patent number: 10938375
    Abstract: A resonator that includes a rectangular vibrating portion having first and second pairs of sides that provides contour vibration. A frame surrounds a periphery of the vibrating portion and a first holding unit between the frame and one of the first sides and includes a first arm substantially in parallel to the vibrating portion, multiple second arms connecting the first arm with the vibrating portion, and a third arm connecting the first arm with the frame. A first connection line is on the first arm; a first terminal is on the frame; three or more electrodes are on the vibrating portion; and multiple first extended lines are on the second arms and connect first and second electrodes with the first connection line. The first extended lines are connected to the first connection line, which is electrically connected to the first terminal.
    Type: Grant
    Filed: August 30, 2017
    Date of Patent: March 2, 2021
    Assignee: MURATA MANUFACTURING CO, LTD.
    Inventors: Daisuke Nakamura, Toshio Nishimura, Ville Kaajakari
  • Patent number: 10892734
    Abstract: A resonator element includes a first electrode that is installed on a resonance portion of one of main surfaces positioned on the front and rear surfaces of a substrate, and a second electrode that is installed on the resonance portion of the other of the main surfaces, an outer shape of the substrate includes a first side surface and a second side surface, are arranged in a second direction intersecting the first direction, the first side surface and the second side surface respectively include an inclined surface, the first electrode includes a first lead electrode installed on the inclined surface of the first side surface, a second electrode includes the second lead electrode installed on the inclined surface of the second side surface, and an angle formed between the inclined surface and the main surface is equal to or greater than 52° and equal to or less than 62°.
    Type: Grant
    Filed: February 19, 2019
    Date of Patent: January 12, 2021
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Atsushi Matsuo
  • 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
  • Patent number: 10659005
    Abstract: An AT-cut crystal element is provided. The AT-cut crystal element includes side surfaces intersecting with a Z?-axis of a crystallographic axis of a crystal. At least one side surface of the side surfaces is constituted of three surfaces of a first surface to a third surface. Besides, a crystal resonator including the AT-cut crystal element, and a crystal unit including the crystal resonator are provided.
    Type: Grant
    Filed: March 31, 2016
    Date of Patent: May 19, 2020
    Assignee: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Takayuki Kuwahara, Kenji Shimao, Hirokazu Iwata
  • Patent number: 10523179
    Abstract: Example implementations of a bulk acoustic wave resonator with an optimized outer perimeter are disclosed. In an example aspect, a resonator includes a truncated-ellipsoid-shaped active region. The active region includes an outer electrode disposed as a first layer of the active region. The active layer also includes a piezoelectric layer disposed as a second layer of the active region with the piezoelectric layer disposed interior to the outer electrode. The active layer further includes an inner electrode disposed as a third layer of the active region with the inner electrode disposed interior to the piezoelectric layer.
    Type: Grant
    Filed: September 18, 2017
    Date of Patent: December 31, 2019
    Assignee: SnapTrack, Inc.
    Inventors: Oscar Menendez-Nadal, Thomas Bain Pollard, Brian Hal Fisher, Janardan Nath
  • Patent number: 9985604
    Abstract: A rectangular quartz crystal blank having long sides substantially parallel to a Z? axis of the quartz crystal blank, and short sides substantially parallel to an X axis of the quartz crystal blank. The quartz crystal blank includes a first center region, a second region and a third region that are adjacent to the first region along a long-side direction, and a fourth region and a fifth region that are adjacent to the first region along a short-side direction. A thickness of the second region and a thickness of the third region are smaller than a thickness of the first region, and/or a thickness of the fourth region and a thickness of the fifth region are smaller than the thickness of the first region, and 13.84?W/T?14.33, where W is a length of a short side and T is a thickness.
    Type: Grant
    Filed: November 29, 2017
    Date of Patent: May 29, 2018
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Hiroyuki Yamamoto, Hiroshi Ibaragi, Ryuichi Kawai
  • Patent number: 9960751
    Abstract: A piezoelectric vibrator includes a piezoelectric substrate including a first surface, a second surface that is opposites to the first surface, and a connection part that connects the first surface and the second surface to each other, and a pair of excitation electrodes disposed respectively on the first surface and the second surface. The connection part includes a plurality of protruding parts disposed in an area between the excitation electrode and an outer edge of the piezoelectric substrate. Top parts of the protruding parts are arranged so that the closer to the outer edge the top part is, the closer to the second surface the top part is, and lower parts of the protruding parts adapted to connect the adjacent protruding parts to each other are arranged so that the closer to the outer edge the lower part is, the closer to the second surface the lower part is.
    Type: Grant
    Filed: October 19, 2016
    Date of Patent: May 1, 2018
    Assignee: Seiko Epson Corporation
    Inventor: Toshihiro Ii
  • Patent number: 9762206
    Abstract: Embodiments of the invention provide a quartz crystal vibrator including an AT-cut quartz crystal piece having a long side in an X axis direction and including first and second crystal planes formed on at least one side surface thereof in a Y? axis direction, and an electrode layer formed on the AT-cut quartz crystal piece.
    Type: Grant
    Filed: February 6, 2015
    Date of Patent: September 12, 2017
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Seung Mo Lim, Ho Phil Jung, In Young Kang, Je Hong Kyoung, Sung Wook Kim, Jong Pil Lee
  • Patent number: 9726557
    Abstract: A strain sensor having an active area that includes a magnetoelastic resonator and spring configured so that the spring undergoes a greater amount of strain than the resonator when the sensor is under load. The sensor is anchored at opposite ends of the active area to a substrate for which strain is to be measured. An interrogating coil is used for wireless sensor readout. A biasing magnet may be included to provide a desired sensor response for the particular application of the sensor. The strain sensor may be implemented as a differential strain sensor that includes a second, strain-independent reference resonator.
    Type: Grant
    Filed: November 3, 2014
    Date of Patent: August 8, 2017
    Assignee: The Regents of the University of Michigan
    Inventors: Yogesh Gianchandani, Venkatram Pepakayala, Scott Green
  • Patent number: 9722572
    Abstract: Embodiments of the invention provide a quartz vibrator, including a long side in a Y? axis direction, a side in the Y? axis direction including a first crystal face and a second crystal face formed thereon, and another side including an AT-cut quartz piece including a first crystal face and a second crystal face formed thereon and electrode layers formed on the AT-cut quartz piece.
    Type: Grant
    Filed: October 7, 2014
    Date of Patent: August 1, 2017
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Seung Mo Lim, Ho Phil Jung, Won Han, Dong Joon Oh, Sung Wook Kim, Tae Joon Park
  • Patent number: 9577574
    Abstract: A resonator includes: a resonator element including a quartz crystal substrate that includes a first area performing a thickness-shear vibration and a second area with a thickness thinner than the first area and located around the first area; and a base substrate to which the second area of the resonator element on one edge side thereof is attached via a bonding material. The quartz crystal substrate has a major surface that is a surface including an X-axis and a Z?-axis, and has a thickness in a direction along a Y?-axis. The resonator satisfies the relation: 1.5×??Xp where Xp is the maximum length of an area of the second area where the bonding material is bonded along the X-axis in a plan view and ? is the wavelength of a flexural vibration occurring in the quartz crystal substrate.
    Type: Grant
    Filed: February 8, 2016
    Date of Patent: February 21, 2017
    Assignee: Seiko Epson Corporation
    Inventors: Kenji Komine, Go Yamashita, Takumi Suzuki, Wataru Ikegami
  • Patent number: 9431955
    Abstract: An integrated circuit device includes a pair of serially-connected crystal resonators arranged as a first crystal resonator, which is configured to preferentially support a fundamental resonance mode in response to an input signal, and a second crystal resonator, which is configured to preferentially support a third or higher overtone resonance mode in response to a signal generated at an output terminal of the first crystal resonator. A negative impedance converter (NIC) is also provided, which has an input terminal electrically connected to an input terminal of the first crystal resonator and an output terminal electrically connected to one of the output terminal of the first crystal resonator and the output terminal of the second crystal resonator. The NIC may be a CMOS-based NIC that is devoid of inductive reactance from a passive inductor.
    Type: Grant
    Filed: December 31, 2015
    Date of Patent: August 30, 2016
    Assignee: INTEGRATED DEVICE TECHNOLOGY, iNC.
    Inventors: James Bryan Northcutt, Eugene Stanley Trefethen, Harry LeRoy Sutter, Stephen Amar Tibbitts, Charles Michael Rice, Bruce Edward Clark
  • Patent number: 9344058
    Abstract: A resonator element includes a base portion and a pair of vibrating arms that are provided integrally with the base portion, are aligned in an X-axis direction, and extend in a Y-axis direction from the base portion. Each of the vibrating arms includes an arm portion and a wide hammerhead that is located on the free end side of the arm portion and has a greater length in the X-axis direction than the arm portion. Assuming that the length of the vibrating arm in the Y-axis direction is L and the length of the hammerhead in the Y-axis direction is H, the relationship of 1.2%<H/L<30.0% is satisfied. Assuming that the length of the arm portion in the X-axis direction is W1 and the length of the hammerhead in the X-axis direction is W2, the relationship of 1.5?W2/W1?10.0 is satisfied.
    Type: Grant
    Filed: March 10, 2014
    Date of Patent: May 17, 2016
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Akinori Yamada
  • Patent number: 9337803
    Abstract: A piezoelectric device includes a vibrator, a piezoelectric drive unit, and a first piezoelectric detector. The vibrator includes a first surface, a first groove formed along a first axis direction, and a second groove formed to be parallel to the first groove. The piezoelectric drive unit includes a first electrode pair provided in the first groove and opposed to each other in a second axis direction orthogonal to the first axis direction and parallel to the first surface, and a first piezoelectric body provided between the first electrode pair, and is capable of vibrating the vibrator. The first piezoelectric detector includes a second electrode pair provided in the second groove and opposed to each other in the second axis direction, and a second piezoelectric body provided between the second electrode pair, and is capable of detecting a vibration of the vibrator.
    Type: Grant
    Filed: June 2, 2014
    Date of Patent: May 10, 2016
    Assignee: Sony Corporation
    Inventors: Kazuo Takahashi, Satoshi Mitani, Hidetoshi Kabasawa
  • Patent number: 9203135
    Abstract: In a method for manufacturing a quartz crystal resonator, the method comprising the steps of: forming a quartz crystal tuning fork resonator having a quartz crystal tuning fork base, and first and second quartz crystal tuning fork tines; forming at least one groove in at least one of opposite main surfaces of each of the first and second quartz crystal tuning fork tines so that a width of the at least one groove is greater than a distance in the width direction of the at least one groove measured from an outer edge of the at least one groove to an outer edge of the corresponding one of the first and second quartz crystal tuning fork tines; and forming a metal film on at least one of the opposite main surfaces of the first and second quartz crystal tuning fork tines so that an oscillation frequency of the quartz crystal tuning fork resonator is lower than 32.768 kHz.
    Type: Grant
    Filed: October 11, 2013
    Date of Patent: December 1, 2015
    Assignee: PIEDEK TECHNICAL LABORATORY
    Inventor: Hirofumi Kawashima
  • Patent number: 9102067
    Abstract: A sensor element includes a piezoelectric substrate made of a trigonal single crystal and an electrode arranged on the piezoelectric substrate. The substrate surface of the piezoelectric substrate includes an electrical axis of crystal axes. An angle ? formed by the substrate surface and a plane including the electrical axis and an optical axis of the crystal axes is 0°<?<20°.
    Type: Grant
    Filed: November 6, 2012
    Date of Patent: August 11, 2015
    Assignee: Seiko Epson Corporation
    Inventor: Hiroki Kawai
  • Publication number: 20150145378
    Abstract: Embodiments of the invention provide a quartz vibrator and a method for manufacturing the same. The quartz vibrator includes a quartz substrate vibrating depending on an electrical signal, first and second electrodes formed on both surfaces of the quartz substrate, and a first protective layer including an opening corresponding to a trimming region of the first electrode and formed on the first electrode.
    Type: Application
    Filed: March 13, 2014
    Publication date: May 28, 2015
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventor: Je Hong KYOUNG
  • Publication number: 20150054386
    Abstract: A piezoelectric resonating element includes a piezoelectric substrate that includes a rectangular vibrating section and a thick section integrally formed with the vibrating section, excitation electrodes, and lead electrodes. The thick section includes a first thick section and a second thick section of which one end is formed continuous to the first thick section. The first thick section includes a first inclined section of which the thickness changes and a first thick section main body of a quadrangle column shape, and at least one slit is provided in the first thick section.
    Type: Application
    Filed: October 10, 2014
    Publication date: February 26, 2015
    Inventor: Osamu ISHII
  • Patent number: 8898874
    Abstract: To fabricate a plurality of piezoelectric vibrating pieces while firmly preventing a defect, a crack, or a breakage from being brought about at a wafer in the midst of fabrication, there is provided a method of fabricating a piezoelectric vibrating piece which is a method of fabricating a plurality of piezoelectric vibrating pieces from a wafer S, the method including a film forming step of respectively forming metal films M on both faces of the wafer, a patterning step of removing a region of the metal film on an inner side of an outer peripheral end of the wafer by a constant distance H, thereafter, patterning the metal film M to outer shapes of the plurality of piezoelectric vibrating pieces, an outer shape forming step of forming outer shapes of the plurality of piezoelectric vibrating pieces at the wafer a size of which is reduced by an amount of the constant distance by selectively removing the wafer by wet etching by constituting a mask by the patterned metal film, and a removing step of removing the m
    Type: Grant
    Filed: February 17, 2009
    Date of Patent: December 2, 2014
    Assignee: SII Crystal Technology Inc.
    Inventors: Mitsuo Tomiyama, Takashi Kobayashi, Kazuyoshi Sugama
  • Publication number: 20140300252
    Abstract: A piezoelectric resonating element includes a piezoelectric substrate having a rectangular vibrating portion and a thick-walled portion, excitation electrodes and, and lead electrodes. The thick-walled portion includes a fourth thick-walled portion, a third thick-walled portion, a first thick-walled portion, and a second thick-walled portion. The third thick-walled portion includes a third slope portion and a third thick-walled body, and at least one slit is formed in the third thick-walled portion.
    Type: Application
    Filed: June 23, 2014
    Publication date: October 9, 2014
    Inventors: Osamu ISHII, Shiro MURAKAMI
  • Publication number: 20140266485
    Abstract: A resonator includes a resonator element, which includes a quartz crystal substrate formed of crystal, and a package in which the resonator element is housed. The quartz crystal substrate includes a base portion and two vibrating arms that are aligned in the X-axis direction of the crystal and extend from the base portion in the +Y?-axis direction (or the ?Y?-axis direction) of the quartz crystal. The principal surface of the base portion on the ?Z?-axis side (+Z?-axis side when the vibrating arms extend in the ?Y?-axis direction) in the quartz crystal is fixed to the package.
    Type: Application
    Filed: March 10, 2014
    Publication date: September 18, 2014
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Akinori YAMADA
  • Publication number: 20140217856
    Abstract: A piezoelectric resonator element includes a piezoelectric substrate formed of an AT-cut quartz crystal substrate in which the thickness direction thereof is a direction parallel to the Y? axis; and excitation electrodes disposed so as to face vibrating regions on both front and rear principal surfaces of the piezoelectric substrate. The piezoelectric substrate includes a rectangular excitation portion in which sides parallel to the X axis are long sides thereof, and sides parallel to the Z? axis are short sides thereof; and a peripheral portion having a smaller thickness than the excitation portion and formed around the excitation portion. Each of side surfaces of the excitation portion extending in a direction parallel to the X axis is present in one plane, and each of side surfaces of the excitation portion extending in a direction parallel to the Z? axis has a step.
    Type: Application
    Filed: April 11, 2014
    Publication date: August 7, 2014
    Applicant: Seiko Epson Corporation
    Inventors: Toshihiro II, Kenji KOMINE, Matsutaro NAITO
  • Publication number: 20140203689
    Abstract: A resonator element has a piezoelectric substrate including a vibration section and a thick section having a thickness which is thicker than that of the vibration section, and a pair of excitation electrodes provided on a surface and aback surface of the vibration section. In addition, the thick section has a second thick section provided along a second outer edge of the vibration section. The second thick section has an outer edge section intersecting with both axes of an X axis and a Z? axis in an end portion opposite to the fixing section in a plan view of the resonator element.
    Type: Application
    Filed: January 15, 2014
    Publication date: July 24, 2014
    Applicant: Seiko Epson Corporation
    Inventor: Naohisa Obata
  • Patent number: 8779652
    Abstract: AT-cut quartz-crystal vibrating pieces and corresponding quartz-crystal devices are disclosed each having a vibrating portion surrounded by a frame portion across a through-slot configured to provide a wide vibrating portion. An exemplary vibrating piece has a quartz-crystal vibrating portion that vibrates when electrically energized, a frame portion surrounding the vibrating portion, and a through-slot defined between the vibrating portion and the frame portion. The through-slot includes a first through-slot extending in the X-axis direction along +Z?-edge of the vibrating portion, and a second through-slot extending in the X-axis direction along the ?Z?-edge of the vibrating portion. The first through-slot has a different width than the second through-slot.
    Type: Grant
    Filed: December 22, 2011
    Date of Patent: July 15, 2014
    Assignee: Nihon Dempa Kogyo Co., Ltd.
    Inventors: Shuichi Mizusawa, Takehiro Takahashi, Kunio Morita, Masakazu Harada
  • Patent number: 8773005
    Abstract: Quartz-crystal vibrating devices are disclosed, including vibrating and frame portions separated by a through-slot. An edge surface of the slot has a protrusion preventing unwanted formation of artifact “electrodes.” The vibrating portion and frame are made of AT-cut quartz as a unit. A joining portion couples the frame and vibrating portion together across the through-slot. A package base has two external electrodes. A third frame region has first and second plane surfaces. The protrusion projects toward the vibrating portion and has first and/or second sloped surfaces. First and second extraction electrodes extend from respective excitation electrodes via respective joining portions to respective external electrodes. The extraction electrodes pass across the first plane surface and first sloped surface or across the second plane surface and second slanted surface.
    Type: Grant
    Filed: December 28, 2011
    Date of Patent: July 8, 2014
    Assignee: Nihon Dempa Kogyo Co., Ltd.
    Inventors: Shuichi Mizusawa, Takehiro Takahashi
  • Patent number: 8723396
    Abstract: A SAW device has an IDT which is provided on the principal surface of a quartz crystal sustrate having Euler angles (?1.5°???1.5°, 117°???142°, ?) and excites a SAW in a stopband upper end mode. Inter-electrode-finger grooves 8 are recessed between the electrode fingers of the IDT. When the Euler angle ? is 42.79°?|?|?49.57°, the thickness H of the electrode fingers of the IDT is set to be within 0.055 ?m?H?0.335 ?m, preferably, 0.080 ?m?H?0.335 ?m. When the Euler angle ? is |?|?90°×n (where n=0, 1, 2, 3), and the thickness H of the electrode fingers is set to 0.05 ?m?H?0.20 ?m.
    Type: Grant
    Filed: September 1, 2011
    Date of Patent: May 13, 2014
    Assignee: Seiko Epson Corporation
    Inventors: Kunihito Yamanaka, Takuya Owaki, Naohisa Obata
  • Patent number: 8723395
    Abstract: A SAW device has an IDT which is provided on the principal surface of a quartz crystal substrate having Euler angles (?1.5°???1.5°, 117°???142°, 42.79?|?|?49.57°) and excites a SAW in a stopband upper end mode, and a pair of reflectors which are arranged on both sides of the IDT. Inter-electrode-finger grooves are recessed between the electrode fingers of the IDT, and inter-conductor-strip grooves are recessed between the conductor strips of the reflectors. A first direction (X? axis) perpendicular to the electrode fingers and the conductor strips intersects the electrical axis (X axis) of the quartz crystal substrate at an angle ?. At least a part of the IDT and the reflectors are arranged in a second direction intersecting the first direction at an angle ? of 1.0°???2.75°. An excellent frequency-temperature characteristic and a high Q value in an operation temperature range are realized simultaneously.
    Type: Grant
    Filed: September 1, 2011
    Date of Patent: May 13, 2014
    Assignee: Seiko Epson Corporation
    Inventor: Kunihito Yamanaka
  • Patent number: 8653722
    Abstract: The present disclosure provides a manufacturing method of a quartz-crystal device, in which its lid and base is manufactured with smaller thermal expansion coefficient between AT-cut quartz-crystal wafer.
    Type: Grant
    Filed: August 1, 2011
    Date of Patent: February 18, 2014
    Assignee: Nihon Dempa Kogyo Co., Ltd.
    Inventor: Shuichi Mizusawa
  • Publication number: 20140029179
    Abstract: A resonator element includes a base section, a pair of vibrating arms projecting from the base section in a +Y-axis direction, and arranged in an X-axis direction intersecting with the Y-axis direction with a distance in a plan view, and a support arm disposed between the pair of vibrating arms and projecting from the base section in the +Y-axis direction. The base section includes a first shrunk-width portion disposed on an opposite side to the side on which the support arm projects taking the center of the base section as a boundary, and within a range of the distance, and having a length in the X-axis direction gradually decreasing with a distance from the support arm in a plan view.
    Type: Application
    Filed: July 23, 2013
    Publication date: January 30, 2014
    Applicant: Seiko Epson Corporation
    Inventor: Akinori YAMADA
  • Patent number: 8525394
    Abstract: To provide an AT-cut quartz-crystal vibrating piece in which size of the vibrating unit is adjusted to appropriate value, so that the unnecessary vibration is inhibited and degradation of its characteristics is prevented. A mesa-type AT-cut quartz-crystal vibrating piece for vibrating at 38.400 MHz comprising a rectangular excitation unit (31) and a peripheral region (32) formed on the periphery of the excitation unit and having a thickness less than the thickness of the excitation unit, is represented by the following equation: Mx/Gx=0.09×n?0.06 (n: natural number) . . . (1). Length of a crystallographic x-axis direction of the excitation unit is defined as Mx (mm) and length of the crystallographic x-axis direction of the peripheral region and excitation unit is defined as Gx (mm).
    Type: Grant
    Filed: September 1, 2011
    Date of Patent: September 3, 2013
    Assignee: Nihon Dempa Kogyo Co., Ltd.
    Inventors: Manabu Ishikawa, Kenji Shimao, Hiroyuki Sasaki
  • Patent number: 8525607
    Abstract: A crystal oscillator having a plurality of quartz crystals that are manufactured so that the directional orientation of the acceleration sensitivity vector is essentially the same for each crystal. This enables convenient mounting of the crystals to a circuit assembly with consistent alignment of the acceleration vectors. The crystals are aligned with the acceleration vectors in an essentially anti-parallel relationship and can be coupled to the oscillator circuit in either a series or parallel arrangement. Mounting the crystals in this manner substantially cancels the acceleration sensitivity of the composite resonator and oscillator, rendering it less sensitive to vibrational forces and shock events.
    Type: Grant
    Filed: May 17, 2012
    Date of Patent: September 3, 2013
    Assignee: Greenray Industries, Inc.
    Inventors: Steven Fry, Wayne Bolton, John Esterline
  • Publication number: 20130193807
    Abstract: An AT-cut quartz crystal vibrating piece with an excitation unit is in a rectangular shape. The quartz crystal vibrating piece includes a framing body, a connecting portion, a pair of excitation electrodes, and a pair of extraction electrodes. The excitation unit has a long side that is rotated at 61° or 119° with respect to the crystallographic axis X. The framing body has a long side that extends in 61° or 119° direction with respect to the crystallographic axis X. The connecting portion extends in 61° or 119° direction with respect to the crystallographic axis X. The connecting portion is perpendicular to a short side of the excitation unit and a short side of the framing body.
    Type: Application
    Filed: December 20, 2012
    Publication date: August 1, 2013
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventor: NIHON DEMPA KOGYO CO., LTD.
  • Patent number: 8405286
    Abstract: The present disclosure provides a mesa-type AT-cut quartz-crystal vibrating piece, in which amount of the vibrating unit is adjusted to appropriate amount, in order to inhibit unnecessary vibration and to prevent degradation. The mesa-type AT-cut quartz-crystal vibrating piece (30) for vibrating piece vibrates at 38.400 MHz comprises a rectangular excitation unit (31), a peripheral region (32) formed in periphery of the excitation unit and thinner than the excitation unit. The thickness difference h (?m) between one principal surface of the excitation unit and the adjacent peripheral region is obtained by the following equation: h=(0.2×Mx)?143 The length of the x-axis direction of the crystallographic X-axis is Mx (?m).
    Type: Grant
    Filed: August 4, 2011
    Date of Patent: March 26, 2013
    Assignee: Nihon Dempa Kogyo Co., Ltd.
    Inventors: Kenji Shimao, Manabu Ishikawa, Hiroyuki Sasaki
  • Patent number: 8350449
    Abstract: The quartz crystal device of a first aspect comprises a quartz crystal element having an vibrating portion which vibrates when a voltage is applied and a frame portion which surrounds the periphery of the vibrating portion, the quartz crystal element being formed of an AT-cut quartz crystal material specified by the X-axis, the Y?-axis and the Z?-axis; a base which is bonded to one main surface of the frame portion, the base being formed of a Z-cut quartz crystal material specified by the X-axis, the Y-axis and the Z-axis; and a lid which is bonded to other main surface of the frame portion, the frame portion being formed of the Z-cut quartz crystal material. The Z?-axis of the quartz crystal element is coincident with the X-axis or the Y-axis of the base and the lid.
    Type: Grant
    Filed: March 25, 2011
    Date of Patent: January 8, 2013
    Assignee: Nihon Dempa Kogyo Co., Ltd.
    Inventors: Takehiro Takahashi, Shuichi Mizusawa
  • Patent number: 8319404
    Abstract: In an exemplary method for making crystal vibrating devices, four wafers are provided: a crystal wafer, a base wafer, a first-lid wafer, and a second-lid wafer. The crystal wafer defines multiple crystal vibrating pieces including respective frames and respective electrodes formed on both main surfaces thereof. The base wafer defines multiple base plates bondable to one main surface of respective frames. The first-lid wafer defines multiple first lids bondable to the other main surface of the respective frames. Each first lid defines a void registrable with respective electrodes. The second-lid wafer is sized similarly to and bondable to the first-lid wafer so as to sealably close the voids. In a first bonding step the crystal wafer is bonded to the base wafer and first-lid wafer. In a subsequent adjustment step the thickness of at least one electrode per each crystal vibrating piece is adjusted to adjust the vibrational frequency of the respective vibrating portion.
    Type: Grant
    Filed: March 29, 2011
    Date of Patent: November 27, 2012
    Assignee: Nihon Dempa Kogyo, Co., Ltd.
    Inventor: Takehiro Takahashi
  • Patent number: 8305154
    Abstract: The present invention is a piezoelectric crystal oscillator using parametric amplification to enhance the Q. Parametric amplification is accomplished by driving the same region of the crystal as used for the oscillator with an overtone of the crystal resonator.
    Type: Grant
    Filed: November 24, 2010
    Date of Patent: November 6, 2012
    Assignee: HRL Laboratories, LLC
    Inventors: Randall Kubena, Yook-Kong Yong
  • Patent number: 8299689
    Abstract: A quartz crystal resonator element includes an AT-cut quartz crystal substrate, the substrate having edges parallel to each of a Z? axis obtained by rotating a Z? axis in a range of ?120° to +60° about a Y? axis and an X? axis perpendicular to the Z? axis when an angle formed by rotating a +Z? axis in a direction of a +X axis about the Y? axis is a positive rotation angle; a thin section that forms a resonating section; and a thick section adjacent to the resonating section, the thin section and the thick section being formed on the quartz crystal substrate by wet etching. The thin section is formed either on a main surface of the substrate corresponding to a +Y?-axis side or on a main surface of the substrate corresponding to a ?Y?-axis side.
    Type: Grant
    Filed: August 24, 2011
    Date of Patent: October 30, 2012
    Assignee: Seiko Epson Corporation
    Inventor: Ryoichi Yasuike
  • Patent number: 8247955
    Abstract: An electroacoustic component includes a substrate that includes a quartz single crystal. The quartz single crystal has a first Euler angle ?: ?5°???5°, a second Euler angle ?, and a third Euler angle ?. A contiguous region of the quartz single crystal has the following vertices Pi(?i, ?i): (23°, 20°), (60°, 17°), (110°, 30°), (105°, 42°), (60°, 30°), (23°, 25°).
    Type: Grant
    Filed: October 12, 2007
    Date of Patent: August 21, 2012
    Assignee: EPCOS AG
    Inventors: Ulrike Roesler, Evelyn Riha, Werner Ruile
  • Patent number: 8247948
    Abstract: A oscillator include: a vibrator that vibrates in a thickness shear vibration mode; a first adsorption film formed in a first region in a first surface of the vibrator; a second adsorption film formed in a second region in a second surface of the vibrator opposing to the first surface; and a substrate with a surface on which the vibrator is erected, wherein the vibrator contacts the substrate in a third surface that is different from the first surface and the second surface.
    Type: Grant
    Filed: April 28, 2010
    Date of Patent: August 21, 2012
    Assignee: Seiko Epson Corporation
    Inventor: Takayuki Kondo
  • Patent number: 8242666
    Abstract: A contour resonator is provided with a vibrating body formed from a flat plate in a square shape, excitation electrodes formed on both front and back surfaces of the vibrating body and regulating a resonance frequency, and temperature characteristic adjustment films formed on surfaces of the excitation electrodes and adjusting a temperature characteristic.
    Type: Grant
    Filed: February 18, 2008
    Date of Patent: August 14, 2012
    Assignee: Seiko Epson Corporation
    Inventor: Akinori Yamada
  • Patent number: 8188800
    Abstract: A crystal oscillator having a plurality of quartz crystals that are manufactured so that the directional orientation of the acceleration sensitivity vector is essentially the same for each crystal. This enables convenient mounting of the crystals to a circuit assembly with consistent alignment of the acceleration vectors. The crystals are aligned with the acceleration vectors in an essentially anti-parallel relationship and can be coupled to the oscillator circuit in either a series or parallel arrangement. Mounting the crystals in this manner substantially cancels the acceleration sensitivity of the composite resonator and oscillator, rendering it less sensitive to vibrational forces and shock events.
    Type: Grant
    Filed: November 5, 2009
    Date of Patent: May 29, 2012
    Assignee: Greenray Industries, Inc.
    Inventors: Steven Fry, Wayne Bolton, John Esterline
  • Patent number: 8164235
    Abstract: A piezoelectric resonator includes a pair of driving electrodes and a pair of lead electrodes that are formed facing each other on the frontside and backside of a piezoelectric plate that operates in a thickness-shear vibration mode. The front and back driving electrodes are formed such that they each have one or more pairs of parallel sides and have the same shape, and their centers face each other. The parallel sides of one of the front and back driving electrodes are formed parallel with either the X-axis or the Z?-axis of the piezoelectric plate, but the parallel sides of the other driving electrodes are formed without being parallel with the X-axis and Z?-axis thereof.
    Type: Grant
    Filed: July 30, 2008
    Date of Patent: April 24, 2012
    Assignee: Daishinku Corporation
    Inventor: Shinichi Koyama
  • Patent number: 8143768
    Abstract: Novel configurations for a miniature vibrating beam mechanical resonator provide low energy transfer to a supporting structure and low sensitivity to mounting misalignment. A symmetric suspended portion includes two vibrating beams that vibrate normal to a quiescent plane of the resonator, 180 degrees out of phase relative to one another. The vibrating beams are attached, at least at one end, to a torsional coupling element that is joined to a mounting pad along a non-translating suspension boundary. Counterbalances are attached to the vibrating beams, and the resonator is configured such that dynamic forces and moments coupled to each torsional coupling element from the vibrating beams are balanced along each nominal non-translating suspension boundary proximate to the symmetry axis and along the symmetry axis proximate to each nominal non-translating suspension boundary. Each non-translating suspension boundary is a torsional axis for a twisting deformation of the first torsional coupling element.
    Type: Grant
    Filed: May 20, 2010
    Date of Patent: March 27, 2012
    Inventor: Richard A. Hanson
  • Publication number: 20120032563
    Abstract: The present disclosure provides a mesa-type AT-cut quartz-crystal vibrating piece, in which amount of the vibrating unit is adjusted to appropriate amount, in order to inhibit unnecessary vibration and to prevent degradation. The mesa-type AT-cut quartz-crystal vibrating piece (30) for vibrating piece vibrates at 38.400 MHz comprises a rectangular excitation unit (31), a peripheral region (32) formed in periphery of the excitation unit and thinner than the excitation unit. The thickness difference h (?m) between one principal surface of the excitation unit and the adjacent peripheral region is obtained by the following equation: h=(0.2×Mx)?143 The length of the x-axis direction of the crystallographic X-axis is Mx (?m).
    Type: Application
    Filed: August 4, 2011
    Publication date: February 9, 2012
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Kenji Shimao, Manabu Ishikawa, Hiroyuki Sasaki
  • Patent number: 8089201
    Abstract: A contour resonator reducing fluctuation of resonance frequency due to variety of a film thickness of an excitation electrode is provided. A counter resonator includes a quartz substrate and excitation electrodes respectively formed on front and back surfaces of the quartz substrate. There is a range where a frequency sensitivity with respect to an electrode film thickness is smaller than that in related art when a ratio Fe/Fb between a contour vibration frequency Fe of the excitation electrodes and a contour vibration frequency Fb of the substrate is larger than 0.69. That is, fluctuation of the contour vibration frequency with respect to variety of the electrode film thickness can be made small substantially.
    Type: Grant
    Filed: January 10, 2008
    Date of Patent: January 3, 2012
    Assignee: Seiko Epson Corporation
    Inventor: Akinori Yamada
  • Patent number: 8084926
    Abstract: An AT cut quartz crystal resonator element includes a quartz crystal element piece having an exciting part formed from an AT cut quartz crystal plate in a rectangular shape having an X-axis direction of a quartz crystal set to a long side, and an exciting electrode formed on each of front and back main surfaces of the exciting part, in which each side surface in the longitudinal direction of the exciting part is composed of two faces, an m-face of a quartz crystal and a crystal face other than the m-face.
    Type: Grant
    Filed: November 24, 2010
    Date of Patent: December 27, 2011
    Assignee: Seiko Epson Corporation
    Inventors: Matsutaro Naito, Yoshiyuki Aoshima, Kenji Komine
  • Publication number: 20110304406
    Abstract: A quartz crystal resonator element includes an AT-cut quartz crystal substrate, the substrate having edges parallel to each of a Z? axis obtained by rotating a Z? axis in a range of ?120° to +60° about a Y? axis and an X? axis perpendicular to the Z? axis when an angle formed by rotating a +Z? axis in a direction of a +X axis about the Y? axis is a positive rotation angle; a thin section that forms a resonating section; and a thick section adjacent to the resonating section, the thin section and the thick section being formed on the quartz crystal substrate by wet etching. The thin section is formed either on a main surface of the substrate corresponding to a +Y?-axis side or on a main surface of the substrate corresponding to a ?Y?-axis side.
    Type: Application
    Filed: August 24, 2011
    Publication date: December 15, 2011
    Applicant: EPSON TOYOCOM CORPORATION
    Inventor: Ryoichi YASUIKE
  • Publication number: 20110248606
    Abstract: A resonator element includes: a laminate formed by laminating a plurality of piezoelectric substrates in which thickness-shear vibration occurs.
    Type: Application
    Filed: April 6, 2011
    Publication date: October 13, 2011
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Akinori YAMADA
  • Patent number: 8035463
    Abstract: A Lamb-wave resonator includes: a piezoelectric substrate; an interdigital transducer electrode formed on a main surface of the piezoelectric substrate, the interdigital transducer electrode including a plurality of electrode finger elements being interdigitated, and a bus bar electrode coupling the plurality of electrode finger elements; and a pair of reflectors disposed on opposite sides of the interdigital transducer electrode in a propagation direction of a Lamb wave. A thickness t of the piezoelectric substrate is in a range expressed by 0<t/??3 where a wavelength of the Lamb wave to be excited is represented as ?. If a width of the bus bar electrode is Wb, a distance from the electrode finger elements to the bus bar electrode is Wg, in an orthogonal coordinate with an x axis indicating the distance Wg and a y axis indicating the width Wb, both the distance Wg and the width Wb are in one of a first range and a second range.
    Type: Grant
    Filed: March 2, 2009
    Date of Patent: October 11, 2011
    Assignee: Seiko Epson Corporation
    Inventor: Satoru Tanaka
  • Patent number: 8026652
    Abstract: A quartz crystal resonator element includes an AT-cut quartz crystal substrate, the substrate having edges parallel to each of a Z? axis obtained by rotating a Z? axis in a range of ?120° to +60° about a Y? axis and an X? axis perpendicular to the Z? axis when an angle formed by rotating a +Z? axis in a direction of a +X axis about the Y? axis is a positive rotation angle; a thin section that forms a resonating section; and a thick section adjacent to the resonating section, the thin section and the thick section being formed on the quartz crystal substrate by wet etching. The thin section is formed either on a main surface of the substrate corresponding to a +Y?-axis side or on a main surface of the substrate corresponding to a ?Y?-axis side.
    Type: Grant
    Filed: December 29, 2008
    Date of Patent: September 27, 2011
    Assignee: Epson Toyocom Corporation
    Inventor: Ryoichi Yasuike