113 results about "Piezoelectric mems" patented technology

A microphone including a casing having a front wall, a back wall, and a side wall joining the front wall to the back wall, a transducer mounted to the front wall, the transducer including a substrate and a transducing element, the transducing element having a transducer acoustic compliance dependent on the transducing element dimensions, a back cavity cooperatively defined between the back wall, the side wall, and the transducer, the back cavity having a back cavity acoustic compliance. The transducing element is dimensioned such that the transducing element length matches a predetermined resonant frequency and the transducing element width, thickness, and elasticity produces a transducer acoustic compliance within a given range of the back cavity acoustic compliance.

A monolithic integration of phase change material (PCM) switches with a MEMS resonator is provided to implement switching and reconfiguration functionalities. MEMS resonator includes a piezoelectric material to control terminal connections to the electrodes. The PCM is operable between an ON state and an OFF state by application of heat, which causes the phase change material to change from an amorphous state to a crystalline state or from a crystalline state to an amorphous state, the amorphous state and the crystalline state each associated with one of the ON state and the OFF state. A method of fabricating the MEMS resonator with phase change material is provided. A reconfigurable filter system using the MEMS resonators is also provided.

In a MEMS type variable capacity having a piezoelectric driving mechanism, a movable head having movable electrodes are arranged thereon, stationary electrodes is positioned to face the movable electrodes, and a piezoelectric driving beam structure is joined to the movable head and have one end fixed to the substrate. The movable electrode and the stationary electrode form a variable capacity. In the variable capacity, the distance and capacitance between the movable electrode and the stationary electrode of the variable capacity can be maintained constant so as to realize a reproducibility and a reliable controllability.

This disclosure provides implementations of electromechanical systems piezoelectric resonator transformers, devices, apparatus, systems, and related processes. In one aspect, a transformer includes a piezoelectric layer; a first conductive layer arranged over a first surface of the piezoelectric layer including a first set of electrodes and a second set of electrodes interdigitated with the first set. The transformer includes a second conductive layer arranged over a second surface including at least a third set of electrodes. In some implementations, the transformer includes a first port capable of receiving an input signal and to which the first set of electrodes are coupled, and a second port capable of being coupled to a load and of outputting an output signal, the second set of electrodes being coupled to the second port. Generally, a ratio of the number of electrodes of the second set to the first set characterizes a transformation ratio.

A piezoelectric drive type MEMS element includes: a first substrate including, in a portion thereof, a movable part which is driven by a piezoelectric drive section to be displaced in a convex shape, a movable electrode being provided on a surface of the movable part; and a second substrate which is bonded to the first substrate and supports a fixed electrode facing the movable electrode via a prescribed gap, wherein the piezoelectric drive section includes a piezoelectric film provided on a region of the first substrate which forms the movable part as a portion of the movable part, and a pair of electrodes disposed so as to sandwich the piezoelectric film.

A piezoelectric MEMS switch includes: a base substrate; a diaphragm arranged to oppose the base substrate via a gap; a first piezoelectric drive section constituted by layering a first lower electrode, a first piezoelectric body and a first upper electrode on a first surface of the diaphragm, the first surface being across the diaphragm from the gap; a second piezoelectric drive section constituted by layering a second lower electrode, a second piezoelectric body and a second upper electrode on a second surface of the diaphragm, the second surface facing the gap; a fixed electrode provided on a gap side of the base substrate; and a movable electrode which is fixed to a second piezoelectric drive section side of the diaphragm and opposes the fixed electrode in such a manner that the movable electrode makes contact with and separates from the fixed electrode according to displacement of the diaphragm.

The invention provides a piezoelectric MEMS (Micro Electro Mechanical System) microphone. The piezoelectric MEMS microphone comprises a substrate with a cavity and a piezoelectric vibrating diaphragmarranged on the substrate, wherein the substrate comprises an annular base and a supporting column arranged on the inner side of the annular base at intervals, the piezoelectric vibrating diaphragm comprises a plurality of diaphragms arranged in the circumferential direction of the supporting column at intervals, each diaphragm comprises a fixed end connected with the supporting column and a freeend suspended above the cavity, and the width of each diaphragm is gradually increased from the fixed end to the free end. According to the piezoelectric MEMS microphone, under the action of sound pressure, the free end vibrates, the short fixed end is driven by the wide free end, and the diaphragm close to the fixed end deforms greatly to generate more charges, so that the sensitivity can be further improved.

A microelectromechanical resonator can include a suspended frame-shaped beam anchored at four corners thereof to a surrounding substrate along with a suspended resonator plate tethered on four sides thereof to corresponding sides of the frame-shaped beam. A pair of drive electrodes are provided on first and third diametrically opposite corners of the frame-shaped beam and a pair of sense electrodes are provided on second and fourth diametrically opposite corners of the frame-shaped beam. The resonator may also include a ground electrode on the frame-shaped beam and a piezoelectric layer sandwiched between each of the drive and sense electrodes and the ground electrode.

The invention discloses a numerical simulation analysis method for basic characteristics of a piezoelectric MEMS loudspeaker. The method comprises the following steps: 1) establishing a simulation geometric model of the MEMS loudspeaker; 2) setting physical fields and boundary conditions, including respectively setting material models, piezoelectric constitutive relations, dampers, constraint conditions, impedance boundaries, voltage loads and the like in 'solid mechanics', 'electric fields', 'pressure acoustics, frequency domains' and 'thermo-viscous acoustics, frequency domains' physical fields; 3) defining material parameters; and 4) setting the type and the size of the grid, and dividing the grid; 5) solving and calculating: respectively solving the finite element model by adopting frequency domain and characteristic frequency researches; and (6) result post-processing: obtaining a sound pressure level frequency response curve, a sound pressure and sound pressure level distributiondiagram, a change relation of capacitance values along with frequency, the magnitude and distribution diagram of stress/strain/displacement/speed/acceleration on a vibration part, and the resonance frequency and vibration mode of the MEMS loudspeaker through post-processing.

A self-poling piezoelectric based MEMS device is configured for piezoelectric actuation in response to application of a device operating voltage. The MEMS device comprises a beam, a first electrode disposed on the beam, a layer of piezoelectric material having a self-poling thickness disposed overlying a portion of the first electrode, and a second electrode overlying the layer of piezoelectric material. The layer of piezoelectric material is self-poled in response to application of the device operating voltage across the first and second electrodes. In addition, the self-poled piezoelectric material has a poling direction established according to a polarity orientation of the device operating voltage as applied across the first and second electrodes.

A cooling system and method for using the cooling system are described. The cooling system includes a plurality of individual piezoelectric cooling elements spatially arranged in an array extending in at least two dimensions, a communications interface and driving circuitry. The communications interface is associated with the individual piezoelectric cooling elements such that selected individual piezoelectric cooling elements within the array can be activated based at least in part on heat energy generated in the vicinity of the selected individual piezoelectric cooling elements. The driving circuitry is associated with the individual piezoelectric cooling elements and is configured to drive the selected individual piezoelectric cooling elements.

The invention provides a piezoelectric MEMS microphone. The piezoelectric MEMS microphone comprises: a substrate with a back cavity; and a piezoelectric vibrating diaphragm which is arranged right opposite to the back cavity and comprises a supporting part arranged above the back cavity, wherein the piezoelectric vibrating diaphragm is divided into at least two vibrating areas by the supporting part, the piezoelectric vibrating diaphragm further comprises at least one diaphragm arranged in each vibrating area, each diaphragm comprises a fixed end connected with the substrate or the supportingpart, a free end parallel to the fixed end and arranged oppositely, and a main body part connected with the fixed end and the free end, and the free end and the main body part are both suspended abovethe back cavity, and the width of the main body part is gradually reduced from the fixed end to the free end. Compared with the prior art, the piezoelectric MEMS microphone has the advantages that the resonant frequency is high, the sound pressure utilization area is large, and the sensitivity of the microphone is further improved.

Co-fabricating of vertical piezoelectric MEMS actuators that achieve large positive and negative displacements through operating electric fields in excess of the coercive field includes forming a large negative displacement vertical piezoelectric MEMS actuator, forming a bottom structural dielectric layer above a substrate layer; forming a bottom electrode layer above the structural dielectric layer; forming an active piezoelectric layer above the bottom electrode layer; forming a top electrode layer above the active piezoelectric layer; forming a top structural layer above the top electrode layer, wherein the x-y neutral plane of the negative displacement vertical piezoelectric MEMS actuator is above the mid-plane of the active piezoelectric layer, wherein the negative displacement vertical piezoelectric MEMS actuator is partially released from the substrate to allow free motion of the actuator; and combining the large negative displacement vertical piezoelectric MEMS actuator and a large positive displacement vertical piezoelectric MEMS actuator on the same the substrate.

The invention provides a piezoelectric MEMS acceleration sensor and a preparation method thereof. The piezoelectric MEMS acceleration sensor comprises a cover plate, a detecting structure layer and abottom substrate which are successively connected. The middle part of the detecting structure layer is provided with a sensitive mass block and an L-shaped fixed supporting beam. An upper limit position column and a low limit position column are respectively arranged at that center of the upper and lower sides of the detection structure layer, and are respectively match with a cover plate and a base substrate. Furthermore a two-time silicon-silicon binding method is utilized, thereby forming the piezoelectric MEMS acceleration sensor with a closed inner part. When the whole device is subjectedto non-overload acceleration, the piezoelectric ceramic thin film is deformed and a voltage signal is generated on the surface of the device. When subjected to overload acceleration, limited by the limit structure of the outer frame, the sensitive mass only damps the gap distance of the displacement sensor system, thus playing the role of omni-directional overload protection.

A MEMS resonator is provided with a high quality factor and lower motional impedance. The MEMS resonator includes a silicon layer having opposing surfaces, a piezoelectric layer above one of the surfaces of the silicon layer, and a pair of electrodes disposed on opposing surfaces of the piezoelectric layer, respectively. Moreover, the piezoelectric layer has a crystallographic axis that extends at an angle relative to the vertical axis of the MEMS resonator.

A piezoelectric Micro Electro Mechanical System (MEMS) switch includes a substrate, first and second fixed signal lines symmetrically formed in a spaced-apart relation to each other on the substrate to have a predetermined gap therebetween, a piezoelectric actuator disposed in alignment with the first and the second fixed signal lines in the predetermined gap, and having a first end supported on the substrate to allow the piezoelectric actuator to be movable up and down, and a movable signal line having a first end connected to one of the first and the second fixed signal lines, and a second end configured to be in contact with, or separate from the other of the first and second fixed signal lines, the movable signal line at least one side thereof being connected to an upper surface of the piezoelectric actuator.