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| Number | Title | Issue Date |
| 7893784 | Composite resonance circuit and oscillation circuit using the circuit There is provided a resonance circuit using piezoelectric vibrator such as a quartz resonator, a coil, a capacitor, or an element equivalent to them in combination. When two resonance circuits having different resonance frequencies are combined, it is possible to co... | 02/22/2011 |
| 7570126 | Tuning-fork type piezoelectric vibrating piece and oscillator A tuning fork type piezoelectric vibrating piece, comprising: a base unit having a base electrode for an external connection; a fork shaped arm unit extending from the base unit; a groove portion at least on a surface or a rear surface of the arm unit; a groove elec... | 08/04/2009 |
| 7362193 | Oscillator and an integrated circuit A balanced crystal oscillator circuit comprising: a piezoelectric element Xtal (207; 215; 222,221; 313); a first oscillator subcircuit (202; 210; 218; 302) incorporating a transistor (204;212;220;304); and a second oscillator subcircuit (201;... | 04/22/2008 |
| 7123111 | Micro-electromechanical systems A micro-electromechanical system (MEMS) comprises a substrate incorporating an oscillatory ring, forcing electrodes for driving the ring into resonance, and sensing electrodes providing an electrical output signal dependent on oscillation of the ring as a result of ... | 10/17/2006 |
| 7038359 | Piezoelectric resonator and the method for making the same The present invention provides a method for making high-frequency piezoelectric resonators so that constants of the resonator can be measured precisely. A cavity is formed at a central section of an AT-cut crystal substrate. Two grooves are formed at predetermined d... | 05/02/2006 |
| 6943484 | Tunable piezoelectric micro-mechanical resonator One aspect of the invention relates to a composite member for a resonator having an active piezoelectric element and a passive piezoelectric element. The active piezoelectric element causes the resonator to vibrate and detects the frequency of the vibration. The pas... | 09/13/2005 |
| 5787004 | Method for computer-assisted iterative determination of the transient response of a quartz resonator circuit In the method, following an operating point determination of the quartz resonator circuit, a substitution of the equivalent circuit diagram of the quartz resonator by an independent current source is implemented with the initial, previously determined amp... | 07/28/1998 |
| 5561400 | Oscillator unit An electrical circuit for reliably starting the oscillation of an oscillator comprising a cylindrical piezoelectric body on which an exciting electrode, a feedback electrode which causes an oscillation, and an electrode for detecting an angular rate are m... | 10/01/1996 |
| 5420548 | Quartz crystal oscillator angular velocity detector circuits An angular velocity detector circuit composed of: an oscillator circuit including an inverting amplifier connected between a driving electrode of a quartz crystal and an electrode for detecting an electric field generated in the quartz crystal by a Coriol... | 05/30/1995 |
| 5361045 | High-stability resonators of solid elastic material and oscillators using them A preferred embodiment of a resonator embodying the invention comprises entially a resonating plate, an action electrode and a detection electrode, and a supporting base. The electrodes are placed facing symmetrical narrow edges of the plate, opposite vi... | 11/01/1994 |
| 5319324 | Method of direct bonding of crystals and crystal devices A method of directly bonding a crystal to a crystal includes the steps of mirror-polishing the surfaces of the crystals and then rinsing them with a cleaning material and then affecting a baking operation and then bonding them together and thereafter anne... | 06/07/1994 |
| 5200714 | Crystal oscillator with quartz vibrator having temperature detecting faculty, quartz vibrator for use therein, and method of measuring temperature using quartz vibrator A crystal oscillator for generating an output oscillation whose frequency is maintained constant independently of the variation of temperature including a first quartz vibrator arranged in a heating unit which includes a thermostat and vibrating at a fund... | 04/06/1993 |
| 5149197 | Piezo electric resonator temperature sensor The temperature of a quartz crystal oscillator is determined by comparison of a pair of inharmonically related overtone oxcillations of the same vibrational type, e.g. a thickness shear mode, and of the same overtone order. The use of inharmonically relat... | 09/22/1992 |
| 5132643 | Crystal resonator with plural electrodes for use in a crystal oscillating device of a temperature compensation type A crystal resonator with plural electrodes comprises a crystal piece, first, second and third pairs of electrodes. The crystal piece causes shear vibration. The first electrode pair is provided in the center of the crystal piece and coupled to a variable ... | 07/21/1992 |
| 4628285 | 3-terminal oscillating element and oscillator employing the same A 3-terminal oscillating element has a square plate-like piezoelectric body, first and second electrodes provided on one surface of the piezoelectric body and a common electrode provided on the other surface of the piezoelectric body. The piezoelectric bo... | 12/09/1986 |
| 4481488 | Trapped energy resonator for oscillator and multiple resonator applications A trapped energy piezoelectric resonator for oscillator and multiple resonator applications has a piezoelectric substrate with electrodes disposed on each of its major surfaces. These electrodes are further comprised of a plurality of electrically interco... | 11/06/1984 |
| 4376919 | Circuitry for switching effective electrode area on a crystal in a crystal oscillator to vary the oscillation frequency An oscillator comprises plural electrodes formed on a piezoelectric vibrator, and the oscillation frequency is controlled by varying the duty factor of the pulses for switching an effective electrode area of the plural electrodes. The frequency-temperatur... | 03/15/1983 |
| 4336510 | Oscillator with a feedback circuit employing a pre-polarized ceramic piezoelectric oscillating unit A feedback circuit for use in an oscillator has a piezoelectric oscillating unit constituted by a square plate-like piezoelectric body, first and second electrodes provided on one surface of the piezoelectric body and a common electrode provided on the ot... | 06/22/1982 |
| 4178566 | Quartz crystal tuning fork vibrator for a crystal oscillator An oscillator circuit including a flexural quartz crystal vibrator of the tuning fork type having an electromechanical coupling factor within the range of 2.5% to 3.5%. The vibrator is comprised of a quartz crystal element including a base portion and a p... | 12/11/1979 |
| 4144747 | Simultaneously resonated, multi-mode crystal force transducer The invention is a single crystal force transducer in which the crystal is simultaneously resonated in two different modes having substantially the same frequency-temperature characteristics and different frequency-force characteristics. The difference in... | 03/20/1979 |
| 4109456 | Ceramic capacitor A ceramic capacitor operatively connected to a piezoelectric oscillator for compensating for the temperature dependence of the oscillator frequency is provided for thereby optimizing the accuracy of an electronic timepiece.... | 08/29/1978 |
| 4044317 | Crystal controlled square wave oscillator A crystal controlled square wave oscillator requiring a minimum number of components, exhibiting high frequency stability, and operating at substantially a 50% duty cycle. A quartz crystal dual monolithic resonator is provided having a pair of signal elec... | 08/23/1977 |
| 4028640 | Piezo-electric tuning fork oscillation circuit A piezo-electric tuning fork oscillation circuit including a piezo-electric tuning fork and amplifier units, such as ordinary audio frequency signal amplifier circuits employing transistors, between which amplifier units, a phase correction circuit compri... | 06/07/1977 |
