摘要:
Disclosed herein is an energy trap type piezo-resonator (11) utilizing a thickness shear vibration mode, which is prepared by forming electrodes (13, 14) on both major surfaces of a piezoelectric substrate (12) and providing dynamic damper parts (17, 18) being held between grooves (15a, 15b; 16a, 16b) for preventing leakage of vibration from a vibrating part opposing the electrodes (13, 14) to each other to end portions of the piezoelectric substrate.
摘要:
A piezoelectric resonator which achieves a compact oscillator with high performance having high thermal resistance and a narrow tolerance includes an element body having an excitation layer and a non-excitation layer. One vibration electrode is provided on the surface of the excitation layer and another vibration electrode is provided between the excitation layer and the non-excitation layer. The two vibration electrodes extend from opposing ends of the excitation layer toward the approximate central portion thereof so as to oppose each other at the approximate central portion of the excitation layer. On end-surfaces of the element body, end-surface electrodes are connected to the vibration electrodes, respectively.
摘要:
An energy-trapping piezoelectric resonator vibrates in a third-order wave of a thickness-extension vibration mode. The piezoelectric resonator includes a piezoelectric substrate polarized along its thickness. A ratio of the width W to the thickness T of the substrate is determined to be about 0.88.+-.5%, 1.06.+-.4%, 1.32.+-.5%, 1.80.+-.3%, 2.30.+-.3%, 2.69.+-.3%, 3.16.+-.2%, or 3.64.+-.2%. First and second electrodes are respectively disposed on the obverse and reverse surfaces of the substrate to cover the entire width and opposedly face each other at the central portion of the substrate in the longitudinal direction so as to form a resonance portion between the first and second electrodes. It is thus possible to obtain a piezoelectric resonator which does not require a large extra area of the substrate around the resonance portion and which exhibits good resonance characteristics by effectively suppressing unwanted spurious responses in a range between and near the resonant frequency and the anti-resonant frequency.
摘要:
Disclosed herein is a vibrating unit comprising vibration cancel means which is coupled to a vibration source through a vibration transfer part. The vibration cancel means receives vibration from the vibration source and resonates in a bending mode, to cancel vibration as propagated by a dynamic vibration absorbing phenomenon.
摘要:
A ladder type filter constructed by laminating serial resonators and parallel resonators, which are respectively constituted by a tuning fork type piezoelectric resonator having a piezoelectric substrate provided with first to third slits extending inward from one edge thereof to form a tuning fork-shaped vibrating portion between the second and third silts, and vibrating electrodes for vibrating the tuning fork-shaped vibrating portion of the piezoelectric substrate. The resonators are laminated with layers having a cavity formed therein interposed in between the resonators. Each layer is constructed so as to ensure that a cavity is provided on both sides of each resonator for allowing the vibration of the tuning fork-shaped vibrating portions. The laminated resonators are integrated to form a ladder type filter which is small in size and can be constructed as an electronic component capable of surface mounting.
摘要:
Disclosed is a piezoelectric resonator device. This piezoelectric resonator device comprises a piezoelectric substrate having an almost rectangular plane shape. The piezoelectric substrate is provided with a slit extending to the inside from one edge of the piezoelectric substrate, for forming a tuning fork portion, and a pair of slits for separating the tuning fork portion, spaced apart from the slit forming the tuning fork portion by a predetermined distance on both sides of the slit forming the tuning fork portion, and approximately parallel with the slit forming the tuning fork portion. Vibrating electrodes are formed on both major surfaces of the piezoelectric substrate at a piezoelectric vibrating portion, between the slits separating the tuning fork portion from non-vibrating portions of the substrate.
摘要:
An energy-trapping-type thickness extensional piezoelectric resonator using a thickness extensional vibration mode having first and second resonance electrodes formed on portions of the top surface and the bottom surface of a piezoelectric substrate that is polarized in the thickness direction thereof, respectively, in which a portion where the first and second resonance electrodes oppose each other is formed as an energy-trapping-type vibration section, wherein, in order to suppress frequency changes of the thickness extensional vibration mode due to temperature, which is a main response using resonance characteristics, a suppression response having a frequency-temperature-change tendency for suppressing frequency changes of the main response due to temperature is brought into close proximity with the main response.
摘要:
An energy-trapping-type thickness extensional piezoelectric resonator using a thickness extensional vibration mode having first and second resonance electrodes formed on portions of the top surface and the bottom surface of a piezoelectric substrate that is polarized in the thickness direction thereof, respectively, in which a portion where the first and second resonance electrodes oppose each other is formed as an energy-trapping-type vibration section, wherein, in order to suppress frequency changes of the thickness extensional vibration mode due to temperature, which is a main response using resonance characteristics, a suppression response having a frequency-temperature-change tendency for suppressing frequency changes of the main response due to temperature is brought into close proximity with the main response.
摘要:
A longitudinally-coupled multi-mode piezoelectric bulk wave filter using the piezoelectric longitudinal effect includes a plurality of excitation electrodes extending substantially parallel to each other, a laminated piezoelectric body including a plurality of piezoelectric layers arranged between the excitation electrodes and polarized in a predetermined direction, an input electrode and output electrode disposed on a first side surface of the laminated piezoelectric body, and a ground electrode disposed on a second side surface of the laminated piezoelectric body. When an input signal is applied between the input electrode and the ground electrode, vibration modes of different orders of harmonic waves are excited and coupled so that an output signal is output between the output terminal and the ground terminal. Let T represent the dimension of the width between the opposed first and second side surfaces of the laminated piezoelectric body and D represent the distance between the adjacent excitation electrodes, and T/D is equal to or smaller than about 0.9. As a result, a longitudinally-coupled multi-mode piezoelectric bulk wave filter presenting a large out-of-band attenuation is provided.
摘要:
In a longitudinally coupled multi-mode piezoelectric bulk wave filter, a laminated piezoelectric body obtained by overlapping a plurality of excitation electrodes with piezoelectric layers therebetween and piezoelectric portions aligned with the laminated piezoelectric body are integrated. The thickness of each of the piezoelectric portions is greater than the thickness of the laminated piezoelectric body. The input electrode, the output electrode, and the ground electrode are connected to the respective excitation electrodes of the piezoelectric body. When an input signal is applied between the input electrode and the ground electrode, harmonics, with a plurality of different orders of vibrations, using the piezoelectric longitudinal effect are efficiently generated and are combined to produce the filter characteristic.