Class / Patent application number | Description | Number of patent applications / Date published |
310320000 | Piezoelectric slab having different resonant frequencies at different areas | 12 |
20090072663 | SINGLE-RESONATOR DUAL-FREQUENCY LATERAL-EXTENSION MODE PIEZOELECTRIC OSCILLATORS, AND OPERATING METHODS THEREOF - Oscillators include a resonator having first and second electrodes and configured to resonate at a first frequency at which the first and second electrodes carry in-phase signals and at a second frequency at which the first and second electrodes carry out-of-phase signals. A driver circuit is configured to selectively sustain either the in-phase signals on the first and second electrodes or the out-of-phase signals on the first and second electrodes so that the resonator selectively resonates at either the first frequency or the second frequency, respectively. Related oscillator operating methods are also disclosed. | 03-19-2009 |
20100052476 | PIEZOELECTRIC FILTER AND METHOD FOR MANUFACTURING THE SAME - A piezoelectric filter of the present invention is provided with first and second piezoelectric vibrators, each having a substrate, a lower load film formed on the substrate, a lower electrode formed on the lower load film, a piezoelectric element formed on the lower electrode, an upper electrode formed on the piezoelectric element and an upper load film formed on the upper electrode, and the piezoelectric filter is configured by electrically connecting the first and second piezoelectric vibrators to each other, and the piezoelectric element of the first piezoelectric vibrator and the piezoelectric element of the second piezoelectric vibrator correspond to respectively different areas of the same piezoelectric element; thus, the resonance frequencies of the first and second piezoelectric vibrators are adjusted by the respective lower load films and upper load films of the first piezoelectric vibrator and the second piezoelectric vibrator so that the resonance frequencies of the first and second piezoelectric vibrators are made different from each other. | 03-04-2010 |
20100141090 | ACOUSTIC SENSOR WITH PIEZO-ARRANGEMENT FILM - Provided is an acoustic sensor for measuring a sound wave propagating through a gas such as air or a fluid such as water and an elastic wave propagating through a solid medium, and more particularly, an acoustic sensor with a piezo-arrangement film capable of detecting frequencies in a broad band or amplifying a signal at a specific frequency by comparting a waveguide into an upper waveguide and a lower waveguide by means of a compartment diaphragm and arranging piezoelectric sensors on the compartment diaphragm in several forms. The acoustic sensor can be utilized as a resonant acoustic sensor in which the piezoelectric sensors are arranged on the compartment diaphragm in the same form so that a signal at a specific frequency overlaps for high sensibility or a broadband acoustic sensor in which the piezoelectric sensors are arranged in a different form to detect frequencies in a broad band. The sensor for measuring an acoustic wave includes a waveguide including a vibrating membrane for receiving the acoustic wave, an emitting membrane for emitting the acoustic wave, and a propagation medium filled therein for propagating the acoustic wave received by the vibrating membrane; a compartment diaphragm for computing the waveguide into an upper waveguide and a lower waveguide; an omni-directional endpoint processing unit formed at an end of the waveguide for absorbing the acoustic wave received by the vibrating membrane; and a plurality of piezoelectric sensors formed on the compartment diaphragm for detecting the acoustic wave. | 06-10-2010 |
20100164325 | Elastic wave device and electronic component - To provide an elastic wave device that is small sized and in which a frequency fluctuation due to a change with time hardly occurs, and an electronic component using the above elastic wave device. A trapping energy mode portion | 07-01-2010 |
20100171390 | Elastic wave device and electronic component - To provide an elastic wave device that is small sized and in which a frequency fluctuation due to a change with time hardly occurs, and an electronic component using the above elastic wave device. A trapping energy mode portion | 07-08-2010 |
20100327695 | Multi-frequency acoustic array - An apparatus comprises a substrate and transducers disposed over the substrate, each of the transducers comprising a different resonance frequency. A transducer device comprises circuitry configured to transmit signals, or to receive signals, or both. The transducer device also comprises a transducer block comprising a plurality of piezoelectric ultrasonic transducers (PMUT), wherein each of the PMUTs; and an interconnect configured to provide signals from the transducer block to the circuitry and to provide signals from the circuitry to the transducer block. | 12-30-2010 |
20110006638 | MULTIDOMAIN ACOUSTIC WAVE DEVICES - A multidomain plate acoustic wave device is provided having one or more single piezoelectric crystalline plates with differently polarized ferroelectric domains, where the domains have diverse directions of their axes of polarization. The device may consist of a multidomain plate acoustic wave transducer, a multidomain plate acoustic wave delay line, a multidomain plate acoustic wave rf filter, and any combination thereof. The differently polarized ferroelectric domains may comprise a collection of inversely or differently poled ferroelectric domains within a single piezoelectric medium. The medium may be any crystalline or ceramic plate with non-zero piezoelectric properties, in which the domains are created and embedded. In varying embodiments, the device includes electrodes oriented to generate an external rf field in various, respective directions, including in a direction normal to a basal plane of the device, or in a direction parallel to a length or a width of the device. | 01-13-2011 |
20120194034 | PIEZOELECTRIC DEVICE - A piezoelectric device includes first and second piezoelectric resonators each including a piezoelectric thin film, an upper electrode provided on one main surface of the piezoelectric thin film, and a lower electrode provided on another main surface of the piezoelectric thin film. In the piezoelectric resonators, portions in which the upper and lower electrodes are superposed on each other with the piezoelectric thin film therebetween define piezoelectric vibrating portions that are acoustically isolated from a substrate. The first and second piezoelectric resonators are connected in series or parallel between an input terminal and an output terminal such that polarization directions of corresponding portions of the piezoelectric thin film are opposite to each other when seen from the input terminal. The first piezoelectric resonator and the second piezoelectric resonator are arranged to have different resonant frequencies of a transverse vibration mode. | 08-02-2012 |
20130200752 | METHODS AND APPARATUS FOR MECHANICAL RESONATING STRUCTURES - Mechanical resonating structures and related methods are described. The mechanical resonating structures may provide improved efficiency over conventional resonating structures. Some of the structures have lengths and widths and are designed to vibrate in a direction approximately parallel to either the length or width. They may have boundaries bounding the length and width dimensions, which may substantially align with nodes or anti-nodes of vibration. | 08-08-2013 |
20140175944 | CRYSTAL RESONATOR - A crystal resonator includes a mesa-type crystal element, a pair of excitation electrodes, and a deformed portion. The mesa-type crystal element has a principal surface portion and a peripheral edge portion. The peripheral edge portion surrounds the principal surface portion and has a smaller thickness than the principal surface portion. The pair of excitation electrodes are formed at the principal surface portion on one surface side and the principal surface portion on an other surface side of the crystal element, respectively. The deformed portion is configured to reduce a vibration different from a main vibration and confine energy to the principal surface portion. | 06-26-2014 |
20160052018 | PIEZOELECTRIC DEVICE AND ELECTRONIC DEVICE INCLUDING THE SAME - Provided is a piezoelectric device including at least two piezoelectric plates configured to include at two contact points, wherein the at least two piezoelectric plates include at least two resonant frequencies. The piezoelectric device in a wearable device operates as at least any one of a piezoelectric sound device and a piezoelectric vibration device. | 02-25-2016 |
20160052019 | PIEZOELECTRIC DEVICE AND ELECTRONIC DEVICE INCLUDING THE SAME - Provided is a piezoelectric device including a first piezoelectric plate, and at least one second piezoelectric plate configured to contact at least one area of the first piezoelectric plate, wherein the first and second piezoelectric plates have different resonant frequencies. | 02-25-2016 |