83 results about "PMUT" patented technology

There is described a micromachined ultrasonic transducers (MUTS) and a method of fabrication. The membranes of the transducers are fusion bonded to cavities to form cells. The membranes are formed on a wafer of sacrificial material. This permits handling for fusions bonding. The sacrificial material is then removed to leave the membrane. Membranes of silicon, silicon nitride, etc. can be formed on the sacrificial material. Also described are cMUTs, pMUTs and mMUTs.

A curved sensor device, such as an ultrasonic transducer array, is fabricated from a flat micromachined sensor (such as cMUT or pMUT) array constructed using micromachined electromechanical systems (MEMS) techniques. The device comprises: a support structure comprising a spine having a profile that is generally curved and a multiplicity of teeth extending from one side of the curved spine; and a multiplicity of sensors built on the support structure. The spine can be bent forward or backward and attached to a curved front face of a support member, thereby causing the sensors to adopt a curved array.

Methods are provided for creating a metal or other electrically-conductive member extending from an air-backed cavity of a piezoelectric ultrasonic transducer (pMUT) apparatus defining such an air-backed cavity, through a substrate layer disposed adjacent to the transducer device of the pMUT device, and into electrically-conductive engagement with a first electrode of the pMUT device, such that the electrically-conductive member provides an electrically-conductive engagement between the first electrode and a conformal electrically-conductive layer deposited in the air-backed cavity of the pMUT device. Associated apparatuses are also provided.

An apparatus may include a one- or two-dimensional array of micromechanical ultrasonic transducer (PMUT) elements positioned below, beside, with, on, or above a backplane of a visual display. The backplane may be a thin-film transistor (TFT) backplane. The array of PMUT elements may be a piezoelectric micromechanical ultrasonic transducer (PMUT) array or a capacitive micromechanical ultrasonic transducer (CMUT) array. The PMUT array may be configurable to operate in modes corresponding to multiple frequency ranges. When operating in the low-frequency mode, the apparatus may be capable of gesture detection. A high-frequency mode may include a fingerprint sensor mode or a stylus detection mode.

An ultrasonic imaging apparatus having a Micro-machined Ultrasonic Transducer (MUT), such as a Piezoelectric MUT (PMUT) or Capacitive MUT (CMUT), with a transmitting mode and a receiving mode for generating and sensing acoustic pressure in imaging applications. During transmission in a PMUT the inverse piezoelectric effect on the piezo layer causes transverse stress, which causes a bending moment in the PMUT structure leading to out-of-plane deflection. Different applied signs of voltage generates different signs of stress inside the piezo that in turn cause oscillating motion generating an acoustic pressure wave. During signal reception, incident pressure waves deflect the PMUT creating transverse stress, resulting in a charge determined through measuring voltage between electrodes. The apparatus is particularly well-suited for use in health care, such as measuring fat/muscle thickness, blood-flow, and blood pressure.

A piezoelectric micro-machined ultrasonic transducer (PMUT) comprising: a semiconductor body having a first cavity and a membrane, which is suspended over the first cavity and faces a front side of the semiconductor body; and a piezoelectric transducer assembly extending at least in part on the membrane, which may be actuated for generating a deflection of the membrane. A second cavity extends buried in a peripheral region of the membrane and delimits a central region of the membrane. Moreover, the peripheral portion has a stiffness lower than the stiffness of the central portion.

A piezoelectric micromachined ultrasound transducer (PMUT) is disclosed. The PMUT consists of a flexural membrane that is piezoelectrically actuated. These membranes are formed on a first substrate that is bonded to a second substrate. The two substrates are separated by an air gap to allow the PMUT to vibrate. Several methods for joining the two substrates are described.

The invention relates to an enhanced ultrasonic imaging probe using a flexural-mode piezoelectric transducer and discloses a method for generating an enhanced receiving signal by the piezoelectric ultrasonic transducer. The method comprises the following steps of: supplying the piezoelectric ultrasonic transducer, wherein the piezoelectric ultrasonic transducer comprises a piezoelectric element which can work under a flexural mode; receiving an acoustic signal by the piezoelectric element; applying DC (Direct Current) bias voltage to the piezoelectric element before receiving the acoustic signal and/or while receiving the acoustic signal; and generating the enhanced receiving signal by the piezoelectric element, and using the enhanced receiving signal as a result of receiving the acoustic signal by the piezoelectric element. The invention also discloses an imaging probe based on a pMUT (Piezoelectric Micro-processing Ultrasonic Transducer) using the method.

The invention discloses an optoacoustic/ultrasonic dual mode endoscope based on piezoelectric micromachined ultrasonic transducer arrays. The optoacoustic/ultrasonic dual mode endoscope includes a piezoelectric micromachined ultrasonic transducer (PMUT) array probe (2), a PMUT array element (1), an integrated circuit (3), a plane lens (4), a condenser lens (6), an optical fiber coupling collimator (7), a single-mode fiber (8), an optical fiber FC/APC connector (9), an optical fiber (10), a signal line (11) and an housing (12). The optoacoustic/ultrasonic dual mode endoscope is characterized in that, the piezoelectric micromachined ultrasonic transducers are adopted, the transducers and the integrated circuit are good in compatibility during manufacturing process, and the transducers are easy to form an array; transducer arrays are adopted, the endoscope does not need to rotate, the imaging speed is raised, real time imaging is achieved; and the multiple transducer arrays can effectively raise the signal to noise ratio of a signal, deep imaging through focusing and scanning is achieved. The optoacousitc/ultrasonic dual mode endoscope can be widely applied to fields of medical endoscopes and industrial flaw detection, and particularly has great application value in in-vivo scar tissue identification, assessment of damage of ablation of tissue, atherosclerotic degree assessment and the like.

Piezoelectric Micromachined Ultrasound Transducer (pMUT) arrays for ultrasonic imaging, and related apparatuses, systems, and methods are disclosed. In one embodiment, an ultrasonic imaging assembly comprises a substrate and a plurality of array elements arranged on the substrate in an array. Each array element comprises at least one pMUT disposed on the substrate each having a geometry configured to accept a predetermined fundamental mode vibration. The plurality of array elements are configured to transmit and receive at least one ultrasound beam based on the predetermined fundamental mode vibration. By sizing the pMUTs to correspond to a desired fundamental mode vibration, the pMUT array has improved sensitivity, and can be produced relatively cheaply compared to conventional dicing methods.

The invention provides a flexible micro piezoelectric ultrasonic transducer, a flexible micro piezoelectric ultrasonic transducer array and formation methods of the flexible micro piezoelectric ultrasonic transducer and the flexible micro piezoelectric ultrasonic transducer array. The flexible micro piezoelectric ultrasonic transducer is provided with a flexible substrate and has high flexibility.The flexible micro piezoelectric ultrasonic transducer of the invention includes a flexible substrate and PMUT structures; a first cavity is defined in the top of the flexible substrate; the depth ofthe first cavity is less than or equal to the thickness of the flexible substrate; the PMUT structures are located on the flexible substrate; and the PMUT structure comprises at least a lower electrode, a piezoelectric layer, and an upper electrode.

The invention provides combined stiffness-variable thin film pMUTs and a preparation method thereof. A combined stiffness-variable thin film structure is composed of circular thin film and annular thin film which surrounds the circular thin film in the circumferential direction and is concentric with the circular thin film; according to different working condition demands, the thickness of the circular thin film and the thickness of the annular thin film are adjusted separately to achieve combined stiffness-variable thin film; the overall structure of the combined stiffness-variable thin filmpMUTs sequentially comprises an upper electrode, a vibration thin film piezoelectric driving layer, a lower electrode, a vibration thin film structural layer, a thin film supporting structure and a base structure from top to bottom; when the combined stiffness-variable thin film pMUTs are used in a mode of emitting ultrasonic waves, the circular thin film and the annular thin film are excited according to a certain phase difference, the coupling effect among the circular thin film, a fluid medium and the annular thin film is achieved, and the unit ultrasonic wave emitting power is greatly increased; when the combined stiffness-variable thin film pMUTs are used for receiving the ultrasonic waves, the ultrasonic wide bandwidth receiving performance is achieved through the resonance frequencydeviation of the circular thin film and the annular thin film in the fluid medium. The combined stiffness-variable thin film pMUTs have the high emitting power and wide bandwidth receiving performance.

A diaphragm for a piezoelectric micromachined ultrasonic transducer (PMUT) is presented having resonance frequency and bandwidth characteristics which are decoupled from one another into independent variables. Portions of at least the piezoelectric material layer and backside electrode layer are removed in a selected pattern to form structures, such as ribs, in the diaphragm which retains stiffness while reducing overall mass. The patterned structure can be formed by additive, or subtractive, fabrication processes.

Wide bandwidth piezoelectric micromachined ultrasonic transducers (pMUTs), pMUT arrays and systems having wide bandwidth pMUT arrays are described herein. For example, a piezoelectric micromachined ultrasonic transducer (pMUT) includes a piezoelectric membrane disposed on a substrate. A reference electrode is coupled to the membrane. First and second drive/sense electrodes are coupled to the membrane to drive or sense a first and second mode of vibration in the membrane.

The invention discloses an SOC PMUT suitable for high-density system integration, an array chip and a manufacturing method. The SOC PMUT suitable for high-density system integration realizes vertical stacking and monolithic integration of an SOC PMUT array and a CMOS auxiliary circuit thereof through direct bonding of an active wafer and a multi-channel metal wire structure in the vertical direction, and extends to a packaging layer through a TSV, so that the SOC PMUT does not need to be communicated with a CMOS through pressure welding blocks on the periphery of the array, the bottleneck of traditional ultrasonic transducer metal interconnection is relieved, the chip area occupied by the ultrasonic transducer metal interconnection is greatly reduced, meanwhile, the length of metal wiring is reduced, and the bad influence of the electrical parasitic effect caused by the length on the performance of an ultrasonic transducer array is reduced.

The invention discloses a piezoelectric emission capacitor sensing high-performance MUT unit and a preparation method thereof. An ultrasonic transmitting working mode of the PMUT unit and an ultrasonic receiving working mode of the CMUT unit are combined with each other. The MUT unit is composed of a piezoelectric driving annular thin film and a circular capacitance sensing thin film stacked on the upper surface of the annular thin film. In the ultrasonic transmitting working mode, the annular thin film is driven based on the inverse piezoelectric effect, meanwhile, the circular thin film stacked on the annular thin film is driven to generate piston type vibration, and therefore the ultrasonic emission directivity and ultrasonic output are improved. In the ultrasonic receiving working mode, the annular thin film and the circular thin film are simultaneously subjected to an incident ultrasonic action to generate deflection. Due to the superposition of the deflection of the circular thinfilm and the annular thin film, the stroke variation between the capacitor upper polar plate and the capacitor lower polar plate is increased, so that the unit ultrasonic receiving sensitivity is improved; and meanwhile, the unit can work in a collapse mode by adopting lower bias voltage in an ultrasonic receiving mode, so that the ultrasonic receiving sensitivity of the unit is further improved.