Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
  • A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
  • A61B8/4483—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device characterised by features of the ultrasound transducer
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
  • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
  • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
  • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
  • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
  • B06B1/0207—Driving circuits
  • B06B1/0215—Driving circuits for generating pulses, e.g. bursts of oscillations, envelopes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
  • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
  • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
  • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
  • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
  • B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
  • B06B1/0622—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements on one surface
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
  • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
  • H04R31/006—Interconnection of transducer parts
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K1/00—Printed circuits
  • H05K1/02—Details
  • H05K1/11—Printed elements for providing electric connections to or between printed circuits
  • H05K1/111—Pads for surface mounting, e.g. lay-out
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K1/00—Printed circuits
  • H05K1/02—Details
  • H05K1/11—Printed elements for providing electric connections to or between printed circuits
  • H05K1/111—Pads for surface mounting, e.g. lay-out
  • H05K1/112—Pads for surface mounting, e.g. lay-out directly combined with via connections
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K1/00—Printed circuits
  • H05K1/18—Printed circuits structurally associated with non-printed electric components
  • H05K1/189—Printed circuits structurally associated with non-printed electric components characterised by the use of flexible or folded printed circuits
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10N30/00—Piezoelectric or electrostrictive devices
  • H10N30/01—Manufacture or treatment
  • H10N30/06—Forming electrodes or interconnections, e.g. leads or terminals
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10N30/00—Piezoelectric or electrostrictive devices
  • H10N30/01—Manufacture or treatment
  • H10N30/07—Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base
  • H10N30/071—Mounting of piezoelectric or electrostrictive parts together with semiconductor elements, or other circuit elements, on a common substrate
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10N30/00—Piezoelectric or electrostrictive devices
  • H10N30/01—Manufacture or treatment
  • H10N30/08—Shaping or machining of piezoelectric or electrostrictive bodies
  • H10N30/085—Shaping or machining of piezoelectric or electrostrictive bodies by machining
  • H10N30/088—Shaping or machining of piezoelectric or electrostrictive bodies by machining by cutting or dicing
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10N30/00—Piezoelectric or electrostrictive devices
  • H10N30/80—Constructional details
  • H10N30/87—Electrodes or interconnections, e.g. leads or terminals
  • H10N30/875—Further connection or lead arrangements, e.g. flexible wiring boards, terminal pins
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
  • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
  • B06B2201/00—Indexing scheme associated with B06B1/0207 for details covered by B06B1/0207 but not provided for in any of its subgroups
  • B06B2201/20—Application to multi-element transducer
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
  • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
  • H04R17/005—Piezoelectric transducers; Electrostrictive transducers using a piezoelectric polymer
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
  • H05K2201/01—Dielectrics
  • H05K2201/0137—Materials
  • H05K2201/0154—Polyimide
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
  • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
  • H05K2201/10007—Types of components
  • H05K2201/10151—Sensor

Definitions

• the present application pertains to ultrasound systems, and more particularly to ultrasound systems including a flex circuit for attachment to ultrasound transducer elements in an acoustic stack.
• Ultrasonic transducers generally include piezoelectric transducer elements, which are electrically connected to circuitry such as driving or receiving circuitry for driving the transmission of an ultrasound signal (e.g., an ultrasound pulse) and/or for receiving a reflected ultrasound signal (e.g., an echo signal).
• the transducer elements are coupled to a flex circuit, which provides signal lines for transmitting signals between the transducer elements and the driving circuitry, receiving circuitry, processing circuitry or the like.
• Such circuitry is typically included in electronic equipment that is positioned external to the ultrasound probe, such as an equipment cart or a handheld computing device.
• the flex circuit thus couples the transducer elements to the processing, driving and/or receiving circuitry.
• an electrical pulse is applied to electrodes of the transducer elements, which causes a mechanical change in dimension of the transducer elements and generates an acoustic wave that is transmitted toward a target structure of interest, e.g., an organ or other physiological feature within a patient's body.
• the transmitted acoustic wave is then reflected from the target structure of interest and is received at the surface of the transducer elements, which in response generate a voltage that is detectable as a receive signal by the associated processing and/or receiving circuitry.
• Ultrasonic transducers may include transducer elements that are arranged as phased arrays having one or more rows of transducer elements that are electrically and acoustically isolated from one another. Such arrays may include 64 or more individual transducer elements.
• An acoustic stack may be formed, including such transducer elements, as a layered structure including a backing layer, a flex circuit, the transducer elements (e.g., piezoelectric ceramic elements), and an acoustic matching layer.
• the flex circuit typically includes conductive traces formed on one side of an insulating layer. The conductive traces are then coupled to respective transducer elements.
• An important feature of an ultrasound array, and of the design of such an array, is the reliability of the signal pulse path to and from the
• the signals provided to and from the connected transducer elements may not produce reliable information from which an ultrasound image can accurately be formed.
• the point at which the conductive traces of the flex circuit are coupled to respective transducer elements is thus a critical coupling point, as all driving signals to be provided from the driving circuitry to the transducer elements are provided through the individual conductive traces. Similarly, received echo signals may be provided from the transducer elements to the receiving and/or processing circuitry through the individual conductive traces coupled to the transducer elements.
• the present disclosure addresses a desire for better signal path continuity through a flex circuit in an ultrasound transducer.
• Improving signal path continuity through the flex circuit results in more reliable signal communication between the processing, driving and/or receiving circuitry and the transducer elements.
• Redundant connection points may be provided by including conductive pads on both sides of an insulating layer of the flex circuit.
• the conductive pads on one side of the insulating layer are coupled to respective conductive traces formed on the same side of the insulating layer.
• conductive pads are formed on an opposite side of the insulating layer, and corresponding conductive pads on opposite sides of the insulating layer are aligned with one another and coupled to one another by conductive vias formed through the insulating layer.
• an ultrasound transducer that includes a plurality of transducer elements and a flex circuit.
• the flex circuit includes an insulating layer having a first surface and a second surface opposite the first surface.
• a plurality of first conductive pads is formed on the first surface of the insulating layer, and each first conductive pad is electrically coupled to a respective transducer element.
• a plurality of second conductive pads is formed on the second surface of the insulating layer, and each of the second conductive pads is electrically coupled to a respective first conductive pad and the respective transducer element.
• an ultrasound transducer in another embodiment, includes a flex circuit.
• the flex circuit includes an insulating layer having a first surface and a second surface opposite the first surface, a plurality of conductive traces on the first surface of the insulating layer that are each electrically coupled to respective first conductive pads on the first surface of the insulating layer, and a plurality of second conductive pads on the second surface of the insulating layer.
• the flex circuit further includes a plurality of conductive vias, each of which extend through a respective first conductive pad, the insulating layer, and a respective second conductive pad. Each of the conductive vias electrically couple respective first and second conductive pads to each another.
• the ultrasound transducer may further include a plurality of transducer elements, with each of the transducer elements being electrically coupled to a respective first conductive pad and a respective second conductive pad.
• a method in yet another embodiment, includes forming a plurality of conductive traces on a first surface of an insulating layer; forming a plurality of first conductive pads on the first surface of the insulating layer, each of the first conductive traces being electrically coupled to a respective first conductive pad; forming a plurality of second conductive pads on a second surface of the insulating layer, the second surface being opposite the first surface; and electrically coupling each of the first conductive pads to a respective second conductive pad.
• Figure 1 is a perspective view of a flex circuit for an acoustic stack in an ultrasound transducer, in accordance with one or more embodiments of the present disclosure.
• Figure 2 is perspective view of another flex circuit for an acoustic stack in an ultrasound transducer, in accordance with one or more
• FIG. 3A is a front view illustrating an ultrasound transducer acoustic stack including a flex circuit in accordance with one or more
• Figure 3B is a side view of the acoustic stack shown in Figure 3A, in accordance with one or more embodiments of the present disclosure.
• a flex circuit for an ultrasound transducer may include conductive pads formed on each of two opposite sides of an insulating layer of the flex circuit.
• the conductive pads on a first side of the insulating layer are respectively electrically coupled to corresponding conductive pads on a second side of the insulating layer by a conductive via formed through the corresponding conductive pads and the insulating layer.
• the conductive pads on one of the first side or the second side of the insulating layer are electrically coupled to respective conductive traces on the flex circuit.
• the flex circuit may be coupled to an acoustic stack such that each transducer element in the acoustic stack is electrically coupled to at least two conductive pads, i.e., conductive pads on opposite sides of the insulating layer that are electrically coupled to each other by a conductive via.
• the flex circuit thus provides at least two points of contact, provided by each of the conductive pads coupled to one another through the conductive via, through which a signal transmitted along a conductive trace (e.g., a driving signal for driving a connected transducer element to transmit an ultrasound pulse or an echo signal received by a connected transducer element) may be provided to or received from a transducer element.
• Figure 1 is a perspective view of at least one embodiment of a flex circuit 10 for an acoustic stack in an ultrasound transducer.
• the flex circuit 10 includes an insulating layer 12, conductive traces 14, and conductive pads 16.
• the insulating layer 12 is made of any suitable flexible insulating material, such as polyimide.
• Conductive traces 14 are formed on a first surface 1 1 (e.g., a front surface) of the insulating layer 12.
• the conductive traces 14 may be made of any conductive material and may be formed using any suitable process, such as by deposition of the conductive material on the insulating layer 12 using one or more masks or deposition patterns.
• the conductive traces 14 include copper.
• Each of the conductive traces 14 formed on the first surface 1 1 of the insulating layer 12 is coupled to a respective conductive pad 16a on the first surface 1 1.
• the conductive pads 16a may be formed in a same process, and of a same material, as the conductive traces 14.
• each of the conductive pads 16a on the first surface 1 1 of the insulating layer 12 is aligned with, and electrically coupled to, a respective conductive pad 16b that is formed on a second surface 13 (e.g., a back surface) of the insulating layer 12.
• the conductive pads 16a, 16b are electrically coupled to one another by a conductive through-hole or via 18.
• the via 18 is formed through the aligned, corresponding conductive pads 16a on the first surface 1 1 and conductive pads 16b on the second surface 13.
• a through-hole may be formed, for example, by drilling, punching or the like through the aligned conductive pads 16a, 16b on the first and second surfaces 1 1 , 13 of the insulating layer 12, and the through-hole may then be plated with a conductive material, such as copper. As such, the vias 18 electrically couple respective conductive pads 16a, 16b through the insulating layer 12.
• a signal provided through a trace 14 on the first surface 1 1 of the insulating layer 12 is provided to a conductive pad 16a on the first surface 1 1 , as well as to a corresponding conductive pad 16b on the second surface 13, through the via 18.
• the flex circuit 10 thus provides redundant points of electrical contact when attached to an acoustic stack. That is, the flex circuit 10 may be attached to the acoustic stack such that corresponding conductive pads 16a, 16b formed on each side of the insulating layer 12 are each in contact with a respective transducer element in the acoustic stack. Additionally, since the corresponding conductive pads 16a, 16b are electrically coupled to one another by the conductive via 18, a signal provided through a trace 14 on the first surface 1 1 of the insulating layer 12 will be transmitted to the respective transducer element by the corresponding conductive pads on both surfaces 1 1 , 13 of the insulating layer 12. Accordingly, transmission of a signal (e.g.
• a driving signal) to a transducer element in an acoustic stack may be facilitated even in the event, for example, that one of the corresponding conductive pads 16a, 16b has a faulty connection with the transducer element or is in any way deteriorated in its ability to carry an electrical signal.
• the flex circuit 10 may be diced into individual conductive paths using, for example, a dicing saw.
• the flex circuit 10 may be diced so that each of the conductive paths includes a respective conductive trace 14 and corresponding conductive pads 16a, 16b formed on respective surfaces of the insulating layer 12.
• the flex circuit 10 may be cut, for example, along dicing lines 22, 24, as shown in Figure 1 .
• FIG. 2 is a perspective view of a flex circuit 100 in accordance with one or more alternative embodiments of the present disclosure.
• the flex circuit 100 of Figure 2 is similar in structure and in function to the flex circuit 10 of Figure 1 , except for the differences that will be discussed below.
• the features shared by the flex circuits 10 and 100 will not be described here again in the interest of brevity.
• conductive pads on the second surface 13 of the insulating layer 12 are formed from a single conductive bus 1 16.
• the conductive bus 1 16 may be formed, for example, of copper using a deposition technique.
• the conductive bus 1 16 may be a prefabricated piece of conductive material that is bonded to the second surface 13 of the insulating layer 12 using, for example, an adhesive.
• the conductive bus 1 16 has a height (h) of about 5 millimeters.
• the conductive bus 1 16 is formed on or bonded to an opposite surface of the insulating layer 12 (e.g., the second surface 13, as shown) as the conductive pads 16a.
• conductive vias 18 are formed through the conductive pads 16a on the first surface 1 1 of the insulating layer 12, thereby electrically coupling the conductive pads 16a to corresponding regions of the conductive bus 1 16 on the second surface 13 of the insulating layer 12.
• the flex circuit 100 may then be diced into individual conductive paths using a dicing saw and cutting, for example, along dicing lines 122, 124.
• the flex circuit 100 After dicing through the conductive bus 1 16 and the insulating layer 12, as shown at dicing lines 122, 124, the flex circuit 100 includes individual conductive paths made up of the traces 14 formed on the first surface 1 1 of the insulating layer, as well as conductive pads 16a on the first surface 1 1 and corresponding conductive regions of the conductive bus 1 16 on the second surface 13 (i.e. , portions of the conductive bus 1 16 after dicing) that are coupled to respective conductive pads 16a through the conductive vias 18.
• FIG. 3A is a front view illustrating an ultrasound transducer acoustic stack 200 including a flex circuit in accordance with one or more embodiments of the present disclosure
• Figure 3B is a side view of the acoustic stack 200 shown in Figure 3A.
• the acoustic stack 200 includes a plurality of transducer elements 32, an acoustic matching layer 34, and a flex circuit 10.
• the flex circuit 10 is attached to a lower surface of the transducer elements 32, and the acoustic matching layer 34 is attached to an upper surface of the transducer elements 32.
• the flex circuit 10, transducer elements 32, and acoustic matching layer 34 may be attached to one another to form the acoustic stack 200 using an adhesive material, such as an epoxy.
• an adhesive material such as an epoxy.
• the transducer elements 32 are made of a piezoelectric material, such as a piezoelectric ceramic material.
• the transducer elements 32 may include electrodes (e.g. , signal electrodes and/or ground electrodes) which are electrically coupled to the conductive pads 16a, 16b formed on the first and second surfaces 1 1 , 13, respectively, of the insulating layer 12.
• the transducer elements 32 may be electrically coupled to respective
• each transducer element 32 is electrically coupled to two conductive pads 16a, 16b, one on each surface 1 1 , 13 of the insulating layer 12, thereby establishing redundant points of contact for transmitting a signal from the associated conductive trace 14 to the transducer element 32.
• the acoustic block 200 shown in Figures 3A and 3B may be formed by a variety of fabrication processes.
• the transducer elements 32 may be provided initially as a single block of
• the conductive pads 16a on the first surface 1 1 of the insulating layer 12 and/or the conductive pads 16b on the second surface 13 of the insulating layer 13 may initially be provided as a block of conductive material ⁇ e.g., the conductive bus 1 16 shown in Figure 2) electrically coupled to the respective traces 14 on the insulating layer 12.
• Through-holes may be formed e.g., by drilling, punching or the like, through the conductive bus 1 16 on the second surface 13 at locations that will be included in the conductive pads 16b, once formed.
• the through-holes are formed to extend through the conductive bus 1 16, the insulating layer 12, and the conductive pads 16a on the first surface 1 1 of the insulating layer 12.
• the through-holes may then be plated or otherwise coated with a conductive material, such as copper, to form the conductive vias 18 which electrically couple the conductive pads 16a to associated regions of the conductive bus 1 16 that, after dicing, will become conductive pads 16b on the second surface 13 of the insulating layer 12.
• the piezoelectric block may be attached to the flex circuit 10 such that the conductive pads 16a on the first surface 1 1 and the conductive bus 1 16 on the second surface 13 are in contact with the piezoelectric block.
• the piezoelectric block and the flex circuit 10 may then be diced into individual transducer elements 32 and corresponding conductive pads 16a, 16b using a dicing saw. As such, a plurality of individual transducer elements 32 may be formed, with each transducer element 32 being electrically coupled to a pair of associated conductive pads 16a, 16b of the flex circuit 10.
• Each of the conductive pads 16a is electrically coupled to a corresponding trace 14 formed on the first surface 1 1 of the insulating layer 12, and each conductive pad 16a is further coupled by a conductive via 18 to a respective conductive pad 16b on the second surface 13 of the insulating layer 12. Accordingly, a redundant electrical connection is formed between the flex circuit 10 and the transducer elements 32, as each trace 14 of the flex circuit 10 is coupled to a conductive pad 16a on the first surface 1 1 of the insulating layer 12, as well as to a conductive pad 16b on the second surface 13 of the insulating layer 12.
• gaps formed between transducer elements 32 and/or between adjacent conductive pads 16a, 16b of the flex circuit 10 may be filled with an adhesive material, such as an epoxy filling 40.
• the acoustic matching layer 34 may then be attached to an upper surface of the transducer elements 32 and/or epoxy filling 40 using any suitable adhesive, such as an epoxy.
• the conductive pads 16a on the first surface 1 1 of the insulating layer 12 do not necessarily have the same dimensions as the corresponding conductive pads 16b on the second surface 13 of the insulating layer 12.
• the conductive pads 16b may be formed by dicing through the conductive bus 1 16, while the conductive pads 16a may be already formed of suitable dimensions, along with the traces 14.
• the conductive pads 16b formed after dicing the flex circuit 10 may have a larger area dimension than the pre-formed conductive pads 16a.
• the transducer elements 32 may be initially provided as a single block of piezoelectric material, while the flex circuit 10 may have been previously cut into a plurality of traces 14 and associated conductive pads 16a, 16b with conductive vias 18 formed through
• the pre-cut flex circuit 10 may be attached to the piezoelectric block such that each associated pair of conductive pads 16a, 16b contacts the piezoelectric block at regions that will later be cut into individual transducer elements 32.
• the piezoelectric block is then diced into individual transducer elements 32, for example, using a dicing saw.
• the acoustic stack 10 may be formed from transducer elements 32 that have already been diced, and from the flex circuit 10 that has also already been diced to form a plurality of traces 14 and associated conductive pads 16a, 16b with conductive vias 18 formed through corresponding conductive pads 16a, 16b.
• the transducer elements 32 may be directly attached or otherwise electrically coupled to respective conductive pads 16a, 16b on the first and second surfaces 1 1 , 13, respectively, of the insulating layer 12.
• the epoxy filling 40 may be applied, and the acoustic matching layer 34 may be attached to the transducer elements 32 as described herein.

Landscapes

• Engineering & Computer Science (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Health & Medical Sciences (AREA)
• Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Life Sciences & Earth Sciences (AREA)
• Signal Processing (AREA)
• Acoustics & Sound (AREA)
• Medical Informatics (AREA)
• General Health & Medical Sciences (AREA)
• Heart & Thoracic Surgery (AREA)
• Radiology & Medical Imaging (AREA)
• Molecular Biology (AREA)
• Surgery (AREA)
• Animal Behavior & Ethology (AREA)
• Biomedical Technology (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Pathology (AREA)
• Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
• Biophysics (AREA)
• Gynecology & Obstetrics (AREA)
• Ultra Sonic Daignosis Equipment (AREA)
• Transducers For Ultrasonic Waves (AREA)

Priority Applications (7)

Applications Claiming Priority (2)

Publications (1)

Family

ID=61558909

Family Applications (1)

Country Status (9)

Families Citing this family (3)

Citations (7)

Family Cites Families (9)

• 2017
  • 2017-09-08 KR KR1020197009990A patent/KR102397119B1/ko not_active Expired - Fee Related
  • 2017-09-08 JP JP2019513798A patent/JP7049323B2/ja not_active Expired - Fee Related
  • 2017-09-08 WO PCT/US2017/050768 patent/WO2018049222A1/en not_active Ceased
  • 2017-09-08 CN CN201780068758.0A patent/CN109952768B/zh not_active Expired - Fee Related
  • 2017-09-08 EP EP17849652.7A patent/EP3510794A4/en not_active Withdrawn
  • 2017-09-08 CA CA3035915A patent/CA3035915A1/en active Pending
  • 2017-09-08 RU RU2019110260A patent/RU2751578C2/ru active
  • 2017-09-08 AU AU2017323625A patent/AU2017323625B2/en not_active Ceased
  • 2017-09-08 US US15/699,771 patent/US10973494B2/en not_active Expired - Fee Related

Patent Citations (7)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events