US20160165358A1 - Mems microphone package - Google Patents
Mems microphone package Download PDFInfo
- Publication number
- US20160165358A1 US20160165358A1 US14/586,086 US201414586086A US2016165358A1 US 20160165358 A1 US20160165358 A1 US 20160165358A1 US 201414586086 A US201414586086 A US 201414586086A US 2016165358 A1 US2016165358 A1 US 2016165358A1
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- hole
- electrically conductive
- conductive layer
- mems microphone
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- 239000000758 substrate Substances 0.000 claims abstract description 121
- 230000002093 peripheral effect Effects 0.000 claims description 11
- 239000010409 thin film Substances 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
- H04R1/021—Casings; Cabinets ; Supports therefor; Mountings therein incorporating only one transducer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B7/00—Microstructural systems; Auxiliary parts of microstructural devices or systems
- B81B7/0032—Packages or encapsulation
- B81B7/0061—Packages or encapsulation suitable for fluid transfer from the MEMS out of the package or vice versa, e.g. transfer of liquid, gas, sound
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B7/00—Microstructural systems; Auxiliary parts of microstructural devices or systems
- B81B7/0032—Packages or encapsulation
- B81B7/0064—Packages or encapsulation for protecting against electromagnetic or electrostatic interferences
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B7/00—Microstructural systems; Auxiliary parts of microstructural devices or systems
- B81B7/0032—Packages or encapsulation
- B81B7/007—Interconnections between the MEMS and external electrical signals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B2201/00—Specific applications of microelectromechanical systems
- B81B2201/02—Sensors
- B81B2201/0257—Microphones or microspeakers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/481—Disposition
- H01L2224/48135—Connecting between different semiconductor or solid-state bodies, i.e. chip-to-chip
- H01L2224/48137—Connecting between different semiconductor or solid-state bodies, i.e. chip-to-chip the bodies being arranged next to each other, e.g. on a common substrate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/481—Disposition
- H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/48225—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
- H01L2224/48227—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation connecting the wire to a bond pad of the item
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
- H04R1/04—Structural association of microphone with electric circuitry therefor
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
- H04R1/342—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R19/00—Electrostatic transducers
- H04R19/005—Electrostatic transducers using semiconductor materials
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/003—Mems transducers or their use
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2410/00—Microphones
- H04R2410/03—Reduction of intrinsic noise in microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
Definitions
- the disclosure relates to an MEMS microphone package.
- MEMS microelectromechanical system
- the package of the MEMS microphone comprises a substrate, an MEMS microphone, an integrated circuit (IC) chip and a cover. Both the MEMS microphone and the IC chip are electrically coupled to the substrate, and the cover is disposed on the substrate. Thus, the MEMS microphone and the IC chip are disposed within a chamber formed by the substrate and the cover.
- IC integrated circuit
- An aspect of the disclosure provides an MEMS microphone package, comprising a substrate, at least one MEMS microphone, at least one IC chip and an electrically conductive cover.
- the substrate comprises at least one first hole, an upper surface, a bottom surface, a side surface, at least one first electrically conductive layer and at least one second electrically conductive layer.
- the side surface has two sides connected to the upper surface and the bottom surface, respectively, and the two sides are opposite to each other.
- the at least one first electrically conductive layer is disposed on the upper surface.
- the at least one second electrically conductive layer is disposed on the bottom surface.
- the at least one MEMS microphone is electrically coupled to the substrate.
- the at least one IC chip is electrically coupled to the substrate.
- the electrically conductive cover comprises at least one second hole.
- the electrically conductive cover is bonded to the substrate to form a chamber for accommodating the MEMS microphone and the IC chip.
- the at least one first hole and the at least one second hole together form at least one
- an MEMS microphone package comprising a substrate, at least one MEMS microphone, at least one IC chip and an electrically conductive cover.
- the substrate comprises at least one first hole, an upper surface, a bottom surface, a side surface, at least one first electrically conductive layer and at least one second electrically conductive layer.
- the side surface has two sides connected to the upper surface and the bottom surface, respectively, and the two sides are opposite to each other.
- the at least one first electrically conductive layer is disposed on the upper surface.
- the at least one second electrically conductive layer is disposed on the bottom surface.
- the at least one MEMS microphone is electrically coupled to the substrate.
- the at least one IC chip is electrically coupled to the substrate.
- the electrically conductive cover comprises at least one second hole.
- the electrically conductive cover is bonded to the substrate to form a chamber for accommodating the MEMS microphone and the IC chip, the at least one first hole and the at least one second hole together form at least one acoustic hole, and one part of a boundary of the at least one first hole is disposed on the upper surface and is not on a same plane with one part of a boundary of the at least one second hole.
- an MEMS microphone package comprising a substrate, at least one MEMS microphone, at least one IC chip and an electrically conductive cover.
- the substrate comprises at least one first hole, an upper surface, a bottom surface, a side surface, at least one first electrically conductive layer, at least one second electrically conductive layer and at least one third electrically conductive layer.
- the side surface has two sides connected to the upper surface and the bottom surface, respectively, and the two sides are opposite to each other.
- the at least one first electrically conductive layer is disposed on the upper surface.
- the at least one second electrically conductive layer is disposed on the bottom surface.
- the at least one MEMS microphone electrically is coupled to the substrate.
- the at least one IC chip is electrically coupled to the substrate.
- the electrically conductive cover comprises at least one second hole.
- the electrically conductive cover is bonded to the substrate to form a chamber for accommodating the MEMS microphone and the IC chip, and the at least one first hole and the at least one second hole together form at least one acoustic hole.
- the at least one third electrically conductive layer is disposed on at least one surface of the first hole, the at least one third electrically conductive layer is electrically coupled to the electrically conductive cover, and the at least one third electrically conductive layer is electrically coupled to an electrical ground layer such that the electrically conductive cover and the at least one third electrically conductive layer together form a shield for preventing electromagnetic interference.
- FIG. 1A is a schematic perspective view of an MEMS microphone package according to a first embodiment of the disclosure
- FIG. 1B is a top view of FIG. 1A ;
- FIG. 1C is a cross-sectional view of the MEMS microphone package of FIG. 1A disposed on a printed circuit board;
- FIG. 1D is a schematic perspective view of an MEMS microphone package according to a second embodiment of the disclosure.
- FIG. 2A is a schematic perspective view of an electrically conductive cover of FIG. 1A ;
- FIG. 2B is a schematic perspective view of an electrically conductive cover according to the second embodiment of the disclosure.
- FIG. 2C is a schematic perspective view of an electrically conductive cover according to a third embodiment of the disclosure.
- FIG. 3A is a schematic perspective view of a substrate of FIG. 1A ;
- FIG. 3B is a schematic perspective view of a substrate according to a fourth embodiment of the disclosure.
- FIG. 3C is a schematic perspective view of a substrate according to a fifth embodiment of the disclosure.
- FIG. 3D is a schematic perspective view of a substrate according to a sixth embodiment of the disclosure.
- FIG. 4A is a schematic perspective view of an MEMS microphone package according to a seventh embodiment of the disclosure.
- FIG. 4B is an exploded view of FIG. 4A ;
- FIG. 4C is an exploded view of an MEMS microphone package according to an eighth embodiment of the disclosure.
- FIG. 5 is a schematic perspective view of an MEMS microphone package according to a ninth embodiment of the disclosure.
- FIG. 6 is a schematic perspective view of an MEMS microphone package according to a tenth embodiment of the disclosure.
- FIG. 7 is a schematic perspective view of an MEMS microphone package according to an eleventh embodiment of the disclosure.
- boundaries of first holes 111 a , 111 b , 111 c , 111 d of substrates 11 a , 11 b , 11 c , 11 d are formed by connecting the sidelines (i.e., segments) on surfaces of the substrates. In other words, the ranges of the first holes are enclosed by the sidelines of the surfaces of the substrates (i.e., thick lines in FIG. 3A through FIG. 3D ).
- boundaries of second holes 141 a , 141 b , 141 c of electrically conductive covers 14 a , 14 b , 14 c are formed by connecting the sidelines of electrically conductive covers 14 a , 14 b , 14 c . That is, the ranges of the second holes are enclosed by sidelines of the electrically conductive cover (i.e., thick lines in FIG. 2A through FIG. 2C ).
- FIG. 1A is a schematic perspective view of an MEMS microphone package according to a first embodiment of the disclosure
- FIG. 1B is a top view of FIG. 1A
- FIG. 1C is a cross-sectional view of the MEMS microphone package of FIG. 1A disposed on a printed circuit board.
- the MEMS microphone package 1 a comprises a substrate 11 a , an MEMS microphone 12 , at least one IC chip 13 and an electrically conductive cover 14 a.
- the substrate 11 a comprises at least one first hole 111 a and a surface 1111 a which is one of the surfaces of the first hole 111 a .
- the MEMS microphone 12 is electrically coupled to the substrate 11 a .
- the embodiment of the disclosure is not limited to the quantity of the MEMS microphone 12 . In other embodiments, the quantity of the MEMS microphones 12 is more than one.
- the IC chip 13 is electrically coupled to the substrate 11 a .
- the quantity of the IC chip 13 is, but not limited to, one. In other embodiments, for example, the quantity of the IC chips 13 is more than one.
- the electrically conductive cover 14 a comprises at least one second hole 141 a .
- the electrically conductive cover 14 a is bonded to the substrate 11 a to form a chamber 15 for accommodating the MEMS microphone 12 and the IC chip 13 .
- the first hole 111 a and the second hole 141 a form an acoustic hole 16 a together. It is shown in FIG. 1A that one part of the boundary of the first hole 111 a and one part of the boundary of the second hole 141 a are not formed on a same plane.
- the part of the boundary of the first hole 111 a and the part of the boundary of the second hole 141 a are disposed on different planes of different objects (i.e., on the electrically conductive cover 14 a and the surface of the substrate 11 a ), respectively.
- the plane of the electrically conductive cover 14 a on which the second hole 141 a is disposed is not parallel to the surface of the substrate 11 a on which the first hole 111 a is disposed.
- the acoustic hole 16 a formed by the first hole 111 a and the second hole 141 a communicates with the chamber 15 such that the MEMS microphone 12 within the chamber 15 is capable of receiving external acoustic waves generated outside the MEMS microphone package 1 a .
- the quantity of the acoustic hole 16 a in this embodiment is one, and the acoustic hole 16 a is disposed on a side of the MEMS microphone package 1 a .
- the MEMS microphone package 1 a has enhanced directional function when receiving sound.
- FIG. 1A through FIG. 1D is a schematic perspective view of an MEMS microphone package according to an embodiment of the disclosure.
- the quantity of the acoustic hole 16 a of the MEMS microphone package 1 a is one, but the disclosure is not limited to the quantity of the acoustic hole.
- the quantity of the acoustic holes 16 a is two.
- the acoustic holes 16 a of the MEMS microphone package 1 a are located at two different sides of the MEMS microphone package 1 a .
- the MEMS microphone package 1 a has enhanced directional function when receiving acoustic waves along two different directions.
- the quantity of the MEMS microphone 12 can be adjusted with respect to that of the acoustic hole 16 a .
- the quantity of the acoustic holes 16 a is two, and the quantity of the MEMS microphone 12 can be one or two.
- the MEMS microphones 12 can be disposed in proximity to the acoustic holes 16 a , respectively.
- the function of sound receiving of the MEMS microphones 12 is enhanced.
- FIG. 2A is a schematic perspective view of an electrically conductive cover of FIG. 1A .
- the electrically conductive cover 14 a comprises a top portion 142 a , a side portion and a brim portion 144 a .
- the side portion 143 a surrounds and is connected to the top portion 142 a such that the top portion 142 a and the side portion 143 a forms a space 145 a .
- the brim portion 144 a surrounds and is connected to the side portion 143 a .
- the second hole 141 a extends from an exterior of the brim portion 144 a toward the side portion 143 a . In other words, a boundary of the second hole 141 a is disposed on the brim portion 144 a and the side portion 143 a.
- the above-mentioned configuration of the electrically conductive cover 14 a i.e., the electrically conductive cover 14 a comprising the top portion 142 a , the side portion 143 a and the brim portion 144 a , and the second hole 141 a being disposed on the brim portion 144 a and the side portion 143 a ) shown in FIG. 2A is one of the embodiments of the disclosure. Shapes of the electrically conductive covers 14 a and locations of the second holes 141 a can be adjusted herein without departing from the spirit and the scope of the disclosure. For example, Please refer to FIG. 2B and FIG. 2C , FIG.
- FIG. 2B is a schematic perspective view of an electrically conductive cover according to the second embodiment of the disclosure
- FIG. 2C is a schematic perspective view of an electrically conductive cover according to a third embodiment of the disclosure.
- the differences between the first through the third embodiments are that: the electrically conductive cover in the first embodiment is shown in FIG. 2A ; the electrically conductive cover in the second embodiment is shown in FIG. 2B ; the electrically conductive cover in the third embodiment is shown in FIG. 2C .
- the electrically conductive cover 14 b also comprises a top portion 142 b , a side portion 143 b and a brim portion 144 b .
- the second hole 141 b extends from an exterior of the brim portion 144 b toward a side edge of the side portion 143 b . In other words, the boundary of the second hole 141 b is only disposed on the brim portion 144 b.
- the electrically conductive cover 14 c does not comprise the brim portion 144 b above mentioned in FIG. 2B . That is to say, the electrically conductive cover 14 c only comprises a top portion 142 c and a side portion 143 c . Moreover, the second hole 141 c extends inward from an exterior of the side portion 143 c and is separated from the top portion 142 c by a constant distance. In other words, the boundary of the second hole 141 c is only disposed on the side portion 143 c.
- the substrate 11 a of FIG. 1A further comprises an upper surface 112 a , a bottom surface 113 a , a side surface 114 a , a first electrically conductive layer 115 a , a second electrically conductive layer 116 a and a third electrically conductive layer 117 a .
- the upper surface 112 a and the bottom surface 113 a are connected to two sides of the side surface 114 a that are opposite to each other.
- the first hole 111 a is formed inward from the side surface 114 a of the substrate 11 a and extends through the upper surface 112 a and the bottom surface 113 a of the substrate 11 a .
- side edges L 1 -L 8 of the surface 1111 a of the first hole 111 a are connected to the upper surface 112 a , the bottom surface 113 a and the side surface 114 a , respectively (i.e., the side edges L 1 -L 3 are connected to the upper surface 112 a , the side edges L 4 -L 5 are connected to the side surface 114 a , the side edges L 6 -L 8 are connected to the bottom surface 113 a ).
- the boundary of the first hole 111 a are disposed on the upper surface 112 a , the bottom surface 113 a and the side surface 114 a such that the first hole 111 a is formed to be a through hole on edge (namely, a peripheral through hole).
- the cross-section of the first hole 111 a parallel to the upper surface 112 a is, but not limited to, rectangular. In other embodiments, for example, the cross-section of the first hole 111 a parallel to the upper surface 112 a is semicircle or other shapes that extends through the side edges.
- the first electrically conductive layer 115 a is disposed on the upper surface 112 a .
- the second electrically conductive layer 116 a is disposed on the bottom surface 113 a .
- the third electrically conductive layer 117 a is disposed on a surface 1111 a of the first hole 111 a . Also, two sides of the third electrically conductive layer 117 a are connected to the first electrically conductive layer 115 a and the second electrically conductive layer 116 a to form an electrical interconnection.
- the electrically conductive cover 14 a is electrically coupled to the first electrically conductive layer 115 a
- the second electrically conductive layer 116 a is electrically coupled to one of electrically conductive pads 182 on a printed circuit board 18 outside the MEMS microphone package 1 a
- the electrically conductive pad 182 is electrically coupled to a fourth electrically conductive layer 181 inside the printed circuit board 18 .
- the electrically conductive cover 14 a is electrically coupled to the fourth electrically conductive layer 181 in the printed circuit board 18 outside the MEMS microphone package 1 a via the first electrically conductive layer 115 , the second electrically conductive layer 116 a and the third electrically conductive layer 117 a , the function of electrical ground can be achieved, which allows the electrically conductive cover 14 a being capable of preventing the electromagnetic interference.
- the fourth electrically conductive layer 181 which is used for electrical grounding, is separated from the substrate 11 a , i.e., a separation design. That is, in this embodiment, the substrate 11 a does not comprise the fourth electrically conductive layer 181 therein. In other words, the substrate 11 a only comprises two electrically conducting layers disposed on the upper surface 112 a and the bottom surface 113 a of the substrate 11 a , respectively, which further reduces material cost and fabrication cost of the substrate 11 a.
- the first hole 111 a since the first hole 111 a comprises the third electrically conductive layer 117 a on its surface 1111 a , the first hole 111 a not only is capable of receiving sounds but also has a function of electrical via. Thus, the quantity of the via on the substrate 11 a can be reduced to one such that the total area of the substrate 11 a is further reduced.
- the MEMS microphone package 1 a is not only having better quality of sound receiving but also having thinner package profile.
- the dimension of the acoustic hole 16 a is reduced according to the thinner substrate. The smaller dimension of the acoustic hole 16 a decreases the quality of sound receiving of the MEMS microphone 12 .
- the acoustic hole 16 a is formed by both the first hole 111 a of the substrate 11 a and the second hole 141 a of the electrically conductive cover 14 a .
- the thickness of the MEMS microphone package 1 a is designed to be reduced, the dimension of the acoustic hole 16 a is originally maintained rather than being reduced according to the thinned substrate 11 a .
- the MEMS microphone package 1 a not only maintains the quality of sound receiving but also has the thinner profile of package.
- FIG. 3A is a schematic perspective view of a substrate according to a fourth embodiment of the disclosure
- FIG. 3C is a schematic perspective view of a substrate according to a fifth embodiment of the disclosure
- FIG. 3D is a schematic perspective view of a substrate according to a sixth embodiment of the disclosure.
- the first hole 111 b of the substrate 11 b in the fourth embodiment is also formed (i.e., recessed) toward the side surface 114 b of the substrate 11 b , but the first hole 111 b only extends through the upper surface 112 b of the substrate 11 b without extending through the bottom surface 113 b of the substrate 11 b .
- the first hole 111 b forms a peripheral blind hole.
- the cross-section of the first hole 111 b parallel to the upper surface 112 a is, but not limited to, rectangular.
- the cross-section of the first hole 111 b parallel to the upper surface 112 a is semicircle or other shapes.
- the peripheral blind hole can also be formed by attaching a thin film to the bottom of the through hole to form the peripheral blind hole.
- the first hole 111 b forms a peripheral blind hole, and this blind hole only extends through the upper surface 112 b of the substrate 11 b without extending through the bottom surface 113 b of the substrate 11 b .
- the first electrically conductive layer 115 b and the second electrically conductive layer 116 b are disposed on the upper surface 112 b and the bottom surface 113 b , respectively, and the first electrically conductive layer 115 b can be electrically coupled to the second electrically conductive layer 116 b via an electrical via (not shown) on the substrate.
- the difference between the fifth embodiment (as shown in FIG. 3C ) and the first embodiment (as shown in FIG. 3A ) is that: in the fifth embodiment, the first hole 111 c of the substrate 11 c is not in contact with the side surface 114 c and the bottom surface 113 c of the substrate 11 c , and the first hole 111 c only extends through the upper surface 112 c of the substrate 11 c . That is to say, the boundary of the first hole 111 c is only disposed on the upper surface 112 c of the substrate 11 c , and therefore the first hole 111 c forms a blind hole.
- the first hole 111 c forms a blind hole that only extends through the upper surface 112 c of the substrate 11 c .
- the first electrically conductive layer 115 c and the second electrically conductive layer 116 c are disposed on the upper surface 112 c and the bottom surface 113 c , respectively.
- the first electrically conductive layer 115 c and the second electrically conductive layer 116 c can be electrically coupled to each other via an electrical via (not shown) on the substrate.
- the difference between the sixth embodiment (as shown in FIG. 3D ) and the first embodiment (as shown in FIG. 3A ) is that: in the sixth embodiment, the first hole 111 d of the substrate 11 d extends through both the upper surface 112 d and the bottom surface 113 d of the substrate 11 d , but the first hole 111 d is not in contact with the side surface 114 d of the substrate 11 d . That is to say, the boundary of the first hole 111 d is disposed on both the upper surface 112 d and the bottom surface 113 d of the substrate 11 d , and therefore the first hole 111 d forms a through hole that extends through the upper surface 112 d and the bottom surface 113 d of the substrate 11 d .
- the substrate 11 d in this embodiment is similar to the substrate 11 a shown in FIG. 3A , the first electrically conductive layer 115 d , the second electrically conductive layer 116 d and the third electrically conductive layer 117 d are disposed on the upper surface 112 d , the bottom surface 113 d and the surface of the first hole 111 d , respectively. It is noted that a thin film (not shown) can be attached to the bottom of the first hole 111 d (as shown in FIG. 3D ) to form the blind hole together.
- the electrically conductive covers 14 a - 14 c have three different kinds of embodiments shown in FIG. 2A through FIG. 2C
- the substrates 11 a - 11 d have four different embodiments shown in FIG. 3A through FIG. 3D .
- the MEMS microphone package in this disclosure can combine one kind of the electrically conductive covers 14 a - 14 c among FIG. 2A through FIG. 2C with one kind of the substrate 11 a - 11 d shown in FIG. 3A through FIG. 3D . Consequently, the MEMS microphone package of the disclosure has at least twelve different kinds of embodiments.
- FIG. 4A through FIG. 7 A schematic perspective view of an MEMS microphone package according to a seventh embodiment of the disclosure is shown in FIG. 4A and an exploded view of the MEMS microphone package in FIG. 4A is shown in FIG. 4B .
- An exploded view of an MEMS microphone package according to an eighth embodiment of the disclosure is shown in FIG. 4C .
- FIG. 5 a schematic perspective view of an MEMS microphone package according to a ninth embodiment of the disclosure is shown.
- FIG. 6 a schematic perspective view of an MEMS microphone package according to a tenth embodiment of the disclosure is shown
- FIG. 7 a schematic perspective view of an MEMS microphone package according to an eleventh embodiment of the disclosure is shown.
- the MEMS microphone package 1 b in the seventh embodiment is selected from the electrically conductive cover 14 b shown in FIG. 2B and the substrate 11 c shown in FIG. 3C .
- the acoustic hole 16 b of the MEMS microphone package 1 b is formed by the second hole 141 b disposed on the brim portion 144 b and the first hole 111 c which is a blind hole.
- the MEMS microphone package 1 b in this embodiment comprises a substrate 11 c and an electrically conductive cover 14 b .
- An MEMS microphone (not shown) and at least one IC chip (not shown) are disposed between the substrate 11 c and the electrically conductive cover 14 b , which is similar to the embodiment shown in FIG. 1 .
- the substrate 11 c comprises at least one first hole 111 c .
- the first hole 111 c of the substrate 11 c is not in contact with the side surface 114 c and the bottom surface 113 c of the substrate 11 c , and the first hole 111 c only extends through the upper surface 112 c of the substrate 11 c .
- the boundary of the first hole 111 c is only disposed on the upper surface 112 c of the substrate 11 c , such that the first hole 111 c forms a blind hole.
- the electrically conductive cover 14 b comprises a top portion 142 b , a side portion 143 b , a brim portion 144 b and a second hole 141 b .
- the second hole 141 b extends inward from an exterior of the brim portion 144 b towards a side edge 147 b of the side portion 143 b .
- the boundary of the second hole 141 b in this embodiment is only disposed on the brim portion 144 b .
- the electrically conductive cover 14 b is bonded to the substrate 11 c to form a chamber 15 b for accommodating the MEMS microphone (not shown) and the IC chip (not shown).
- the first hole 111 c and the second hole 141 b form an acoustic hole 16 b .
- the acoustic hole 16 b communicates with the chamber 15 such that the MEMS microphone within the chamber 15 b is capable of receiving acoustic waves outside the MEMS microphone package 1 b .
- the quantity of the acoustic hole 16 b in this embodiment is one, and the acoustic hole 16 b is located at one side of the MEMS microphone package 1 b to enhance the directional function.
- the MEMS microphone package 1 b in the eighth embodiment of the disclosure is selected form the electrically conductive cover 14 b shown in FIG. 2B and the substrate 11 c shown in FIG. 3C , which is the same as the MEMS microphone package 1 b of the seventh embodiment shown in FIG. 4B .
- the difference between the seventh and eighth embodiments is that the MEMS microphone package 1 b in the eighth embodiment shown in FIG. 4C further comprises a third electrically conductive layer 117 c .
- the third electrically conductive layer 117 c is disposed on the surface 1111 c of the first hole 111 c .
- the surface 1111 c of the first hole 111 c comprises a side surface 11111 c and a bottom surface 11112 c .
- the third electrically conductive layer 117 c can be electrically coupled to the electrically conductive cover 14 b through the first electrically conductive layer 115 c , and the third electrically conductive layer 117 c is electrically coupled to an electrical ground layer.
- the electrical ground layer is the fourth electrically conductive layer 181 shown in FIG. 1C or an electrical conductive layer (not shown) inside the substrate 11 c .
- the electrically conductive cover 14 b and the third electrically conductive layer 117 c form a shield together to prevent the electromagnetic interference.
- the third electrically conductive layer 117 c is disposed on all of the side surface 11111 c and the bottom surface 11112 c of the first hole 111 c such that the electrically conductive cover 14 b and the third electrically conductive layer 117 c form a shield together so as to prevent the MEMS microphone 12 and the IC chip 13 of the MEMS microphone package 1 b from the electromagnetic interference.
- the third electrically conductive layer 117 c in this embodiment enhances the whole protection of the MEMS microphone package 1 b against the electromagnetic interference.
- the MEMS microphone package 1 c in the ninth embodiment is selected from the electrically conductive cover 14 a shown in FIG. 2A and the substrate 11 c shown in FIG. 3C .
- the acoustic hole 16 c of the MEMS microphone package 1 c is formed by the second hole 141 a and the first hole 111 c .
- the boundary of second hole 141 a is disposed on both the side portion 143 a and the brim portion 144 a and the first hole 111 c is a blind hole.
- one part of the boundary of the at least one first hole 111 c is not coplanar with one part of the boundary of the at least one second hole 141 a .
- the part of the boundary of the at least one first hole 111 c and the part of the boundary of the at least one second hole 141 a are formed on different planes of different objects (a plane of the electrically conductive cover 14 a and a plane of the substrate 11 a ), respectively. Also, the plane of the electrically conductive cover 14 a on which the second hole 141 a is disposed and the plane of the substrate 11 a on which the first hole 111 c is disposed are not parallel to each other.
- the MEMS microphone package 1 d in the tenth embodiment is selected from the electrically conductive cover 14 a shown in FIG. 2A and the substrate 11 b shown in FIG. 3B .
- the acoustic hole 16 d of the MEMS microphone package 1 d is formed by the second hole 141 a and the first hole 111 b .
- the boundary of second hole 141 a is disposed on both the side portion 143 a and the brim portion. 144 a and the first hole 111 b is a peripheral blind hole.
- one part of the boundary of the at least one first hole 111 b is not coplanar with one part of the boundary of the at least one second hole 141 a .
- the part of the boundary of the at least one first hole 111 b and the part of the boundary of the at least one second hole 141 a are formed on a plane of the electrically conductive cover 14 a and a plane of the substrate 11 b , respectively.
- the part of the boundary of the at least one first hole 111 b and the part of the boundary of the at least one second hole 141 a are formed on different surfaces of different objects, respectively
- the MEMS microphone package 1 e of the eleventh embodiment is selected from the electrically conductive cover 14 b shown in FIG. 2B and the substrate 11 b shown in FIG. 3B .
- the acoustic hole 16 e of the MEMS microphone package 1 e is formed by the second hole 141 b and the first hole 111 b .
- the boundary of the second hole 141 b is disposed only on the brim portion 144 b and the first hole 111 b is a peripheral blind hole.
- one part of the boundary of the at least one first hole 111 b is not coplanar with one part of the boundary of the at least one second hole 141 b .
- the part of the boundary of the at least one first hole 111 b and the part of the boundary of the at least one second hole 141 b are formed on a plane of the electrically conductive cover 14 b and a plane of the substrate 11 b , respectively.
- the part of the boundary of the at least one first hole 111 b and the part of the boundary of the at least one second hole 141 b are formed on different surfaces of different objects, respectively.
- acoustic holes of MEMS microphone packages are disposed on the substrate or the cover.
- the boundaries of the acoustic holes of the MEMS microphone package are on the same plane.
- the position of the MEMS microphone package in the portable electronic device needs to be changed.
- the MEMS microphone package when the boundary of the first hole of the substrate is disposed on the upper surface of the substrate (as shown in FIG. 3A through FIG. 3D ) and the boundary of the second hole of the electrically conductive cover are disposed on the different planes, the MEMS microphone package (as shown in FIG. 1A and FIG. 5 through FIG. 7 ) has more flexibility of the MEMS microphone package assembly. Specifically, when the MEMS microphone package (as shown in FIG. 1A and FIG. 5 through FIG. 7 ) is assembled in the portable electronic device, the MEMS microphone package (as shown in FIG. 1A and FIG. 5 through FIG.
- the acoustic holes e.g., the first hole on the upper surface of the substrate
- the MEMS microphone package (as shown in FIG. 1A ) faces a sound inlet on a surface of the casing of the portable electronic device.
- another gasket can be adopted to make another part of acoustic holes (e.g., the second hole on the electrically conductive cover) of the MEMS microphone package to face another sound inlet on another surface of the casing of the portable electronic device.
- the flexibility of the MEMS microphone package assembly in the portable electronic device is increased.
- the acoustic hole of the MEMS microphone package is formed by both the first hole of the substrate and the second hole of the electrically conductive cover. That is, both the quality of directional sound receiving and the low profile of the MEMS microphone package can be maintained without considering the limitation of thickness of the substrate.
Abstract
Description
- This non-provisional application claims priority under 35 U.S.C. §119(a) on Patent Application No(s). 103142466 filed in Taiwan, R.O.C. on Dec. 5, 2014, the entire contents of which are hereby incorporated by reference.
- The disclosure relates to an MEMS microphone package.
- In recent years, handsets, e.g. smartphones, have adopted more than one microelectromechanical system (MEMS) microphone sensors inside for eliminating background noises during communication, and therefore the demand of the MEMS microphone packages are increased rapidly. So far, there are only few major suppliers of the MEMS microphone in the global market, and these MEMS microphone sensors are one of the most important products in the MEMS markets in the future.
- Generally speaking, the package of the MEMS microphone comprises a substrate, an MEMS microphone, an integrated circuit (IC) chip and a cover. Both the MEMS microphone and the IC chip are electrically coupled to the substrate, and the cover is disposed on the substrate. Thus, the MEMS microphone and the IC chip are disposed within a chamber formed by the substrate and the cover.
- Since current electronic products have been developed to be miniaturized, the thickness of the MEMS microphone package is also reduced accordingly. Therefore, manufacturers try to develop the MEMS microphone packages with not only better sound quality but also smaller thickness.
- An aspect of the disclosure provides an MEMS microphone package, comprising a substrate, at least one MEMS microphone, at least one IC chip and an electrically conductive cover. The substrate comprises at least one first hole, an upper surface, a bottom surface, a side surface, at least one first electrically conductive layer and at least one second electrically conductive layer. The side surface has two sides connected to the upper surface and the bottom surface, respectively, and the two sides are opposite to each other. The at least one first electrically conductive layer is disposed on the upper surface. The at least one second electrically conductive layer is disposed on the bottom surface. The at least one MEMS microphone is electrically coupled to the substrate. The at least one IC chip is electrically coupled to the substrate. The electrically conductive cover comprises at least one second hole. The electrically conductive cover is bonded to the substrate to form a chamber for accommodating the MEMS microphone and the IC chip. The at least one first hole and the at least one second hole together form at least one acoustic hole.
- Another aspect of the disclosure provides an MEMS microphone package, comprising a substrate, at least one MEMS microphone, at least one IC chip and an electrically conductive cover. The substrate comprises at least one first hole, an upper surface, a bottom surface, a side surface, at least one first electrically conductive layer and at least one second electrically conductive layer. The side surface has two sides connected to the upper surface and the bottom surface, respectively, and the two sides are opposite to each other. The at least one first electrically conductive layer is disposed on the upper surface. The at least one second electrically conductive layer is disposed on the bottom surface. The at least one MEMS microphone is electrically coupled to the substrate. The at least one IC chip is electrically coupled to the substrate. The electrically conductive cover comprises at least one second hole. The electrically conductive cover is bonded to the substrate to form a chamber for accommodating the MEMS microphone and the IC chip, the at least one first hole and the at least one second hole together form at least one acoustic hole, and one part of a boundary of the at least one first hole is disposed on the upper surface and is not on a same plane with one part of a boundary of the at least one second hole.
- Yet another aspect of the disclosure provides an MEMS microphone package, comprising a substrate, at least one MEMS microphone, at least one IC chip and an electrically conductive cover. The substrate comprises at least one first hole, an upper surface, a bottom surface, a side surface, at least one first electrically conductive layer, at least one second electrically conductive layer and at least one third electrically conductive layer. The side surface has two sides connected to the upper surface and the bottom surface, respectively, and the two sides are opposite to each other. The at least one first electrically conductive layer is disposed on the upper surface. The at least one second electrically conductive layer is disposed on the bottom surface. The at least one MEMS microphone electrically is coupled to the substrate. The at least one IC chip is electrically coupled to the substrate. The electrically conductive cover comprises at least one second hole. The electrically conductive cover is bonded to the substrate to form a chamber for accommodating the MEMS microphone and the IC chip, and the at least one first hole and the at least one second hole together form at least one acoustic hole. The at least one third electrically conductive layer is disposed on at least one surface of the first hole, the at least one third electrically conductive layer is electrically coupled to the electrically conductive cover, and the at least one third electrically conductive layer is electrically coupled to an electrical ground layer such that the electrically conductive cover and the at least one third electrically conductive layer together form a shield for preventing electromagnetic interference.
- The present disclosure will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only and thus are not limitative of the present disclosure and wherein:
-
FIG. 1A is a schematic perspective view of an MEMS microphone package according to a first embodiment of the disclosure; -
FIG. 1B is a top view ofFIG. 1A ; -
FIG. 1C is a cross-sectional view of the MEMS microphone package ofFIG. 1A disposed on a printed circuit board; -
FIG. 1D is a schematic perspective view of an MEMS microphone package according to a second embodiment of the disclosure; -
FIG. 2A is a schematic perspective view of an electrically conductive cover ofFIG. 1A ; -
FIG. 2B is a schematic perspective view of an electrically conductive cover according to the second embodiment of the disclosure; -
FIG. 2C is a schematic perspective view of an electrically conductive cover according to a third embodiment of the disclosure; -
FIG. 3A is a schematic perspective view of a substrate ofFIG. 1A ; -
FIG. 3B is a schematic perspective view of a substrate according to a fourth embodiment of the disclosure; -
FIG. 3C is a schematic perspective view of a substrate according to a fifth embodiment of the disclosure; -
FIG. 3D is a schematic perspective view of a substrate according to a sixth embodiment of the disclosure; -
FIG. 4A is a schematic perspective view of an MEMS microphone package according to a seventh embodiment of the disclosure; -
FIG. 4B is an exploded view ofFIG. 4A ; -
FIG. 4C is an exploded view of an MEMS microphone package according to an eighth embodiment of the disclosure; -
FIG. 5 is a schematic perspective view of an MEMS microphone package according to a ninth embodiment of the disclosure; -
FIG. 6 is a schematic perspective view of an MEMS microphone package according to a tenth embodiment of the disclosure; and -
FIG. 7 is a schematic perspective view of an MEMS microphone package according to an eleventh embodiment of the disclosure. - In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. It will be apparent, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are schematically shown in order to simplify the drawing.
- In the following embodiments of the disclosure, boundaries of
first holes substrates FIG. 3A throughFIG. 3D ). Similarly, boundaries ofsecond holes FIG. 2A throughFIG. 2C ). - Please refer to
FIG. 1A throughFIG. 1C ,FIG. 1A is a schematic perspective view of an MEMS microphone package according to a first embodiment of the disclosure,FIG. 1B is a top view ofFIG. 1A , andFIG. 1C is a cross-sectional view of the MEMS microphone package ofFIG. 1A disposed on a printed circuit board. In this embodiment, the MEMS microphone package 1 a comprises asubstrate 11 a, anMEMS microphone 12, at least oneIC chip 13 and an electricallyconductive cover 14 a. - The
substrate 11 a comprises at least onefirst hole 111 a and asurface 1111 a which is one of the surfaces of thefirst hole 111 a. TheMEMS microphone 12 is electrically coupled to thesubstrate 11 a. However, the embodiment of the disclosure is not limited to the quantity of theMEMS microphone 12. In other embodiments, the quantity of theMEMS microphones 12 is more than one. - In this embodiment, the
IC chip 13 is electrically coupled to thesubstrate 11 a. The quantity of theIC chip 13 is, but not limited to, one. In other embodiments, for example, the quantity of the IC chips 13 is more than one. - The electrically
conductive cover 14 a comprises at least onesecond hole 141 a. The electricallyconductive cover 14 a is bonded to thesubstrate 11 a to form achamber 15 for accommodating theMEMS microphone 12 and theIC chip 13. Thefirst hole 111 a and thesecond hole 141 a form anacoustic hole 16 a together. It is shown inFIG. 1A that one part of the boundary of thefirst hole 111 a and one part of the boundary of thesecond hole 141 a are not formed on a same plane. In details, the part of the boundary of thefirst hole 111 a and the part of the boundary of thesecond hole 141 a are disposed on different planes of different objects (i.e., on the electricallyconductive cover 14 a and the surface of thesubstrate 11 a), respectively. Also, the plane of the electricallyconductive cover 14 a on which thesecond hole 141 a is disposed is not parallel to the surface of thesubstrate 11 a on which thefirst hole 111 a is disposed. In addition, theacoustic hole 16 a formed by thefirst hole 111 a and thesecond hole 141 a communicates with thechamber 15 such that theMEMS microphone 12 within thechamber 15 is capable of receiving external acoustic waves generated outside the MEMS microphone package 1 a. In addition, the quantity of theacoustic hole 16 a in this embodiment is one, and theacoustic hole 16 a is disposed on a side of the MEMS microphone package 1 a. Thus, the MEMS microphone package 1 a has enhanced directional function when receiving sound. - Please refer to
FIG. 1A throughFIG. 1D , which is a schematic perspective view of an MEMS microphone package according to an embodiment of the disclosure. In the above-mentioned first embodiment, the quantity of theacoustic hole 16 a of the MEMS microphone package 1 a is one, but the disclosure is not limited to the quantity of the acoustic hole. Referring toFIG. 1D , in this embodiment, the quantity of theacoustic holes 16 a is two. Theacoustic holes 16 a of the MEMS microphone package 1 a are located at two different sides of the MEMS microphone package 1 a. Thus, the MEMS microphone package 1 a has enhanced directional function when receiving acoustic waves along two different directions. - Furthermore, the quantity of the
MEMS microphone 12 can be adjusted with respect to that of theacoustic hole 16 a. In this embodiment, the quantity of theacoustic holes 16 a is two, and the quantity of theMEMS microphone 12 can be one or two. When the quantity of theMEMS microphones 12 is two, theMEMS microphones 12 can be disposed in proximity to theacoustic holes 16 a, respectively. Thus, the function of sound receiving of theMEMS microphones 12 is enhanced. - The configuration of the electrically
conductive cover 14 a inFIG. 1A is described as follows withFIG. 2A , which is a schematic perspective view of an electrically conductive cover ofFIG. 1A . - As shown in
FIG. 2A , the electricallyconductive cover 14 a comprises atop portion 142 a, a side portion and abrim portion 144 a. Theside portion 143 a surrounds and is connected to thetop portion 142 a such that thetop portion 142 a and theside portion 143 a forms aspace 145 a. Thebrim portion 144 a surrounds and is connected to theside portion 143 a. Thesecond hole 141 a extends from an exterior of thebrim portion 144 a toward theside portion 143 a. In other words, a boundary of thesecond hole 141 a is disposed on thebrim portion 144 a and theside portion 143 a. - It is noted that the above-mentioned configuration of the electrically
conductive cover 14 a (i.e., the electricallyconductive cover 14 a comprising thetop portion 142 a, theside portion 143 a and thebrim portion 144 a, and thesecond hole 141 a being disposed on thebrim portion 144 a and theside portion 143 a) shown inFIG. 2A is one of the embodiments of the disclosure. Shapes of the electrically conductive covers 14 a and locations of thesecond holes 141 a can be adjusted herein without departing from the spirit and the scope of the disclosure. For example, Please refer toFIG. 2B andFIG. 2C ,FIG. 2B is a schematic perspective view of an electrically conductive cover according to the second embodiment of the disclosure, andFIG. 2C is a schematic perspective view of an electrically conductive cover according to a third embodiment of the disclosure. The differences between the first through the third embodiments are that: the electrically conductive cover in the first embodiment is shown inFIG. 2A ; the electrically conductive cover in the second embodiment is shown inFIG. 2B ; the electrically conductive cover in the third embodiment is shown inFIG. 2C . - In the second embodiment, as shown in
FIG. 2B , the electricallyconductive cover 14 b also comprises atop portion 142 b, aside portion 143 b and abrim portion 144 b. Thesecond hole 141 b extends from an exterior of thebrim portion 144 b toward a side edge of theside portion 143 b. In other words, the boundary of thesecond hole 141 b is only disposed on thebrim portion 144 b. - In the third embodiment, as shown in
FIG. 2C , the electricallyconductive cover 14 c does not comprise thebrim portion 144 b above mentioned inFIG. 2B . That is to say, the electricallyconductive cover 14 c only comprises atop portion 142 c and aside portion 143 c. Moreover, thesecond hole 141 c extends inward from an exterior of theside portion 143 c and is separated from thetop portion 142 c by a constant distance. In other words, the boundary of thesecond hole 141 c is only disposed on theside portion 143 c. - The configuration of the
substrate 11 a ofFIG. 1A according to the first embodiment is described as follows withFIG. 3A . As shown inFIG. 1A ,FIG. 1C andFIG. 3A , thesubstrate 11 a further comprises anupper surface 112 a, abottom surface 113 a, aside surface 114 a, a first electricallyconductive layer 115 a, a second electricallyconductive layer 116 a and a third electricallyconductive layer 117 a. Theupper surface 112 a and thebottom surface 113 a are connected to two sides of theside surface 114 a that are opposite to each other. Thefirst hole 111 a is formed inward from theside surface 114 a of thesubstrate 11 a and extends through theupper surface 112 a and thebottom surface 113 a of thesubstrate 11 a. In other words, side edges L1-L8 of thesurface 1111 a of thefirst hole 111 a are connected to theupper surface 112 a, thebottom surface 113 a and theside surface 114 a, respectively (i.e., the side edges L1-L3 are connected to theupper surface 112 a, the side edges L4-L5 are connected to theside surface 114 a, the side edges L6-L8 are connected to thebottom surface 113 a). Hence, the boundary of thefirst hole 111 a are disposed on theupper surface 112 a, thebottom surface 113 a and theside surface 114 a such that thefirst hole 111 a is formed to be a through hole on edge (namely, a peripheral through hole). In this embodiment, the cross-section of thefirst hole 111 a parallel to theupper surface 112 a is, but not limited to, rectangular. In other embodiments, for example, the cross-section of thefirst hole 111 a parallel to theupper surface 112 a is semicircle or other shapes that extends through the side edges. - The first electrically
conductive layer 115 a is disposed on theupper surface 112 a. The second electricallyconductive layer 116 a is disposed on thebottom surface 113 a. The third electricallyconductive layer 117 a is disposed on asurface 1111 a of thefirst hole 111 a. Also, two sides of the third electricallyconductive layer 117 a are connected to the first electricallyconductive layer 115 a and the second electricallyconductive layer 116 a to form an electrical interconnection. - As shown in
FIG. 1A andFIG. 1C , the electricallyconductive cover 14 a is electrically coupled to the first electricallyconductive layer 115 a, and the second electricallyconductive layer 116 a is electrically coupled to one of electricallyconductive pads 182 on a printedcircuit board 18 outside the MEMS microphone package 1 a. The electricallyconductive pad 182 is electrically coupled to a fourth electricallyconductive layer 181 inside the printedcircuit board 18. Since the electricallyconductive cover 14 a is electrically coupled to the fourth electricallyconductive layer 181 in the printedcircuit board 18 outside the MEMS microphone package 1 a via the first electrically conductive layer 115, the second electricallyconductive layer 116 a and the third electricallyconductive layer 117 a, the function of electrical ground can be achieved, which allows the electricallyconductive cover 14 a being capable of preventing the electromagnetic interference. - In this embodiment, the fourth electrically
conductive layer 181, which is used for electrical grounding, is separated from thesubstrate 11 a, i.e., a separation design. That is, in this embodiment, thesubstrate 11 a does not comprise the fourth electricallyconductive layer 181 therein. In other words, thesubstrate 11 a only comprises two electrically conducting layers disposed on theupper surface 112 a and thebottom surface 113 a of thesubstrate 11 a, respectively, which further reduces material cost and fabrication cost of thesubstrate 11 a. - Moreover, as shown in
FIG. 1A andFIG. 3A , since thefirst hole 111 a comprises the third electricallyconductive layer 117 a on itssurface 1111 a, thefirst hole 111 a not only is capable of receiving sounds but also has a function of electrical via. Thus, the quantity of the via on thesubstrate 11 a can be reduced to one such that the total area of thesubstrate 11 a is further reduced. - In addition, since the
acoustic hole 16 a of the MEMS microphone package 1 a in this embodiment is formed by both thefirst hole 111 a of thesubstrate 11 a and thesecond hole 141 a of the electricallyconductive cover 14 a, the MEMS microphone package 1 a is not only having better quality of sound receiving but also having thinner package profile. Traditionally, when theacoustic hole 16 a is only disposed on thesubstrate 11 a with thinner package profile, the dimension of theacoustic hole 16 a is reduced according to the thinner substrate. The smaller dimension of theacoustic hole 16 a decreases the quality of sound receiving of theMEMS microphone 12. Accordingly, when the thickness of the MEMS microphone package 1 a is reduced and theacoustic hole 16 a is only disposed on thesubstrate 11 a, the quality of sound receiving of theMEMS microphone 12 has to be sacrificed. However, in embodiments of this disclosure, theacoustic hole 16 a is formed by both thefirst hole 111 a of thesubstrate 11 a and thesecond hole 141 a of the electricallyconductive cover 14 a. Thus, when the thickness of the MEMS microphone package 1 a is designed to be reduced, the dimension of theacoustic hole 16 a is originally maintained rather than being reduced according to the thinnedsubstrate 11 a. In short, the MEMS microphone package 1 a not only maintains the quality of sound receiving but also has the thinner profile of package. - It is noted that the
first hole 111 a of thesubstrate 11 a shown inFIG. 3A forms a through hole on edge, but it is only one of the embodiments of the disclosure. Types of thefirst hole 111 a can be adjusted herein without departing from the spirit and the scope of the disclosure. For example, referring toFIG. 3B throughFIG. 3D ,FIG. 3B is a schematic perspective view of a substrate according to a fourth embodiment of the disclosure,FIG. 3C is a schematic perspective view of a substrate according to a fifth embodiment of the disclosure, andFIG. 3D is a schematic perspective view of a substrate according to a sixth embodiment of the disclosure. The differences between the first embodiments and the other embodiments mentioned above are described as follows. - The difference between the fourth embodiment (as shown in
FIG. 3B ) and the first embodiment (as shown inFIG. 3A ) is that: thefirst hole 111 b of thesubstrate 11 b in the fourth embodiment is also formed (i.e., recessed) toward theside surface 114 b of thesubstrate 11 b, but thefirst hole 111 b only extends through theupper surface 112 b of thesubstrate 11 b without extending through thebottom surface 113 b of thesubstrate 11 b. Thus, thefirst hole 111 b forms a peripheral blind hole. In this embodiment, the cross-section of thefirst hole 111 b parallel to theupper surface 112 a is, but not limited to, rectangular. In other embodiments, for example, the cross-section of thefirst hole 111 b parallel to theupper surface 112 a is semicircle or other shapes. It is noted that the peripheral blind hole can also be formed by attaching a thin film to the bottom of the through hole to form the peripheral blind hole. - Moreover, in this embodiment, the
first hole 111 b forms a peripheral blind hole, and this blind hole only extends through theupper surface 112 b of thesubstrate 11 b without extending through thebottom surface 113 b of thesubstrate 11 b. In this embodiment, the first electricallyconductive layer 115 b and the second electricallyconductive layer 116 b are disposed on theupper surface 112 b and thebottom surface 113 b, respectively, and the first electricallyconductive layer 115 b can be electrically coupled to the second electricallyconductive layer 116 b via an electrical via (not shown) on the substrate. - The difference between the fifth embodiment (as shown in
FIG. 3C ) and the first embodiment (as shown inFIG. 3A ) is that: in the fifth embodiment, thefirst hole 111 c of thesubstrate 11 c is not in contact with theside surface 114 c and thebottom surface 113 c of thesubstrate 11 c, and thefirst hole 111 c only extends through theupper surface 112 c of thesubstrate 11 c. That is to say, the boundary of thefirst hole 111 c is only disposed on theupper surface 112 c of thesubstrate 11 c, and therefore thefirst hole 111 c forms a blind hole. - It is noted that, the
first hole 111 c forms a blind hole that only extends through theupper surface 112 c of thesubstrate 11 c. In this embodiment, the first electricallyconductive layer 115 c and the second electricallyconductive layer 116 c are disposed on theupper surface 112 c and thebottom surface 113 c, respectively. The first electricallyconductive layer 115 c and the second electricallyconductive layer 116 c can be electrically coupled to each other via an electrical via (not shown) on the substrate. - The difference between the sixth embodiment (as shown in
FIG. 3D ) and the first embodiment (as shown inFIG. 3A ) is that: in the sixth embodiment, thefirst hole 111 d of thesubstrate 11 d extends through both theupper surface 112 d and thebottom surface 113 d of thesubstrate 11 d, but thefirst hole 111 d is not in contact with theside surface 114 d of thesubstrate 11 d. That is to say, the boundary of thefirst hole 111 d is disposed on both theupper surface 112 d and thebottom surface 113 d of thesubstrate 11 d, and therefore thefirst hole 111 d forms a through hole that extends through theupper surface 112 d and thebottom surface 113 d of thesubstrate 11 d. Thesubstrate 11 d in this embodiment is similar to thesubstrate 11 a shown inFIG. 3A , the first electricallyconductive layer 115 d, the second electricallyconductive layer 116 d and the third electricallyconductive layer 117 d are disposed on theupper surface 112 d, thebottom surface 113 d and the surface of thefirst hole 111 d, respectively. It is noted that a thin film (not shown) can be attached to the bottom of thefirst hole 111 d (as shown inFIG. 3D ) to form the blind hole together. - According to the above-mentioned description, the electrically conductive covers 14 a-14 c have three different kinds of embodiments shown in
FIG. 2A throughFIG. 2C , and the substrates 11 a-11 d have four different embodiments shown inFIG. 3A throughFIG. 3D . Accordingly, the MEMS microphone package in this disclosure can combine one kind of the electrically conductive covers 14 a-14 c amongFIG. 2A throughFIG. 2C with one kind of the substrate 11 a-11 d shown inFIG. 3A throughFIG. 3D . Consequently, the MEMS microphone package of the disclosure has at least twelve different kinds of embodiments. - The following introduces four of the foregoing twelve embodiments. Please refer to
FIG. 4A throughFIG. 7 . A schematic perspective view of an MEMS microphone package according to a seventh embodiment of the disclosure is shown inFIG. 4A and an exploded view of the MEMS microphone package inFIG. 4A is shown inFIG. 4B . An exploded view of an MEMS microphone package according to an eighth embodiment of the disclosure is shown inFIG. 4C . InFIG. 5 , a schematic perspective view of an MEMS microphone package according to a ninth embodiment of the disclosure is shown. InFIG. 6 a schematic perspective view of an MEMS microphone package according to a tenth embodiment of the disclosure is shown, and inFIG. 7 , a schematic perspective view of an MEMS microphone package according to an eleventh embodiment of the disclosure is shown. - As shown in
FIG. 4A andFIG. 4B , theMEMS microphone package 1 b in the seventh embodiment is selected from the electricallyconductive cover 14 b shown inFIG. 2B and thesubstrate 11 c shown inFIG. 3C . In this embodiment, theacoustic hole 16 b of theMEMS microphone package 1 b is formed by thesecond hole 141 b disposed on thebrim portion 144 b and thefirst hole 111 c which is a blind hole. - The
MEMS microphone package 1 b in this embodiment comprises asubstrate 11 c and an electricallyconductive cover 14 b. An MEMS microphone (not shown) and at least one IC chip (not shown) are disposed between thesubstrate 11 c and the electricallyconductive cover 14 b, which is similar to the embodiment shown inFIG. 1 . - The
substrate 11 c comprises at least onefirst hole 111 c. Thefirst hole 111 c of thesubstrate 11 c is not in contact with theside surface 114 c and thebottom surface 113 c of thesubstrate 11 c, and thefirst hole 111 c only extends through theupper surface 112 c of thesubstrate 11 c. In other words, the boundary of thefirst hole 111 c is only disposed on theupper surface 112 c of thesubstrate 11 c, such that thefirst hole 111 c forms a blind hole. - The electrically
conductive cover 14 b comprises atop portion 142 b, aside portion 143 b, abrim portion 144 b and asecond hole 141 b. Thesecond hole 141 b extends inward from an exterior of thebrim portion 144 b towards aside edge 147 b of theside portion 143 b. In other words, the boundary of thesecond hole 141 b in this embodiment is only disposed on thebrim portion 144 b. The electricallyconductive cover 14 b is bonded to thesubstrate 11 c to form a chamber 15 b for accommodating the MEMS microphone (not shown) and the IC chip (not shown). Also, thefirst hole 111 c and thesecond hole 141 b form anacoustic hole 16 b. Theacoustic hole 16 b communicates with thechamber 15 such that the MEMS microphone within the chamber 15 b is capable of receiving acoustic waves outside theMEMS microphone package 1 b. In addition, the quantity of theacoustic hole 16 b in this embodiment is one, and theacoustic hole 16 b is located at one side of theMEMS microphone package 1 b to enhance the directional function. - As shown in
FIG. 4C , theMEMS microphone package 1 b in the eighth embodiment of the disclosure is selected form the electricallyconductive cover 14 b shown inFIG. 2B and thesubstrate 11 c shown inFIG. 3C , which is the same as theMEMS microphone package 1 b of the seventh embodiment shown inFIG. 4B . The difference between the seventh and eighth embodiments is that theMEMS microphone package 1 b in the eighth embodiment shown inFIG. 4C further comprises a third electricallyconductive layer 117 c. The third electricallyconductive layer 117 c is disposed on thesurface 1111 c of thefirst hole 111 c. Thesurface 1111 c of thefirst hole 111 c comprises aside surface 11111 c and abottom surface 11112 c. The third electricallyconductive layer 117 c can be electrically coupled to the electricallyconductive cover 14 b through the first electricallyconductive layer 115 c, and the third electricallyconductive layer 117 c is electrically coupled to an electrical ground layer. For example, the electrical ground layer is the fourth electricallyconductive layer 181 shown inFIG. 1C or an electrical conductive layer (not shown) inside thesubstrate 11 c. Thus, the electricallyconductive cover 14 b and the third electricallyconductive layer 117 c form a shield together to prevent the electromagnetic interference. In other embodiments (not shown), the third electricallyconductive layer 117 c is disposed on all of theside surface 11111 c and thebottom surface 11112 c of thefirst hole 111 c such that the electricallyconductive cover 14 b and the third electricallyconductive layer 117 c form a shield together so as to prevent theMEMS microphone 12 and theIC chip 13 of theMEMS microphone package 1 b from the electromagnetic interference. Specifically, the third electricallyconductive layer 117 c in this embodiment enhances the whole protection of theMEMS microphone package 1 b against the electromagnetic interference. - As shown in
FIG. 5 , theMEMS microphone package 1 c in the ninth embodiment is selected from the electricallyconductive cover 14 a shown inFIG. 2A and thesubstrate 11 c shown inFIG. 3C . In this embodiment, theacoustic hole 16 c of theMEMS microphone package 1 c is formed by thesecond hole 141 a and thefirst hole 111 c. In this embodiment, it is noted that the boundary ofsecond hole 141 a is disposed on both theside portion 143 a and thebrim portion 144 a and thefirst hole 111 c is a blind hole. In this embodiment, one part of the boundary of the at least onefirst hole 111 c is not coplanar with one part of the boundary of the at least onesecond hole 141 a. Specifically, the part of the boundary of the at least onefirst hole 111 c and the part of the boundary of the at least onesecond hole 141 a are formed on different planes of different objects (a plane of the electricallyconductive cover 14 a and a plane of thesubstrate 11 a), respectively. Also, the plane of the electricallyconductive cover 14 a on which thesecond hole 141 a is disposed and the plane of thesubstrate 11 a on which thefirst hole 111 c is disposed are not parallel to each other. - As shown in
FIG. 6 , theMEMS microphone package 1 d in the tenth embodiment is selected from the electricallyconductive cover 14 a shown inFIG. 2A and thesubstrate 11 b shown inFIG. 3B . In this embodiment, theacoustic hole 16 d of theMEMS microphone package 1 d is formed by thesecond hole 141 a and thefirst hole 111 b. In this embodiment, the boundary ofsecond hole 141 a is disposed on both theside portion 143 a and the brim portion. 144 a and thefirst hole 111 b is a peripheral blind hole. In this embodiment, one part of the boundary of the at least onefirst hole 111 b is not coplanar with one part of the boundary of the at least onesecond hole 141 a. Specifically, the part of the boundary of the at least onefirst hole 111 b and the part of the boundary of the at least onesecond hole 141 a are formed on a plane of the electricallyconductive cover 14 a and a plane of thesubstrate 11 b, respectively. In detail, the part of the boundary of the at least onefirst hole 111 b and the part of the boundary of the at least onesecond hole 141 a are formed on different surfaces of different objects, respectively - As shown in
FIG. 7 , the MEMS microphone package 1 e of the eleventh embodiment is selected from the electricallyconductive cover 14 b shown inFIG. 2B and thesubstrate 11 b shown inFIG. 3B . In this embodiment, theacoustic hole 16 e of the MEMS microphone package 1 e is formed by thesecond hole 141 b and thefirst hole 111 b. In this embodiment, the boundary of thesecond hole 141 b is disposed only on thebrim portion 144 b and thefirst hole 111 b is a peripheral blind hole. In this embodiment, one part of the boundary of the at least onefirst hole 111 b is not coplanar with one part of the boundary of the at least onesecond hole 141 b. Specifically, the part of the boundary of the at least onefirst hole 111 b and the part of the boundary of the at least onesecond hole 141 b are formed on a plane of the electricallyconductive cover 14 b and a plane of thesubstrate 11 b, respectively. In detail, the part of the boundary of the at least onefirst hole 111 b and the part of the boundary of the at least onesecond hole 141 b are formed on different surfaces of different objects, respectively. - In the current technology, acoustic holes of MEMS microphone packages are disposed on the substrate or the cover. In other words, in the current technology, the boundaries of the acoustic holes of the MEMS microphone package are on the same plane. When the MEMS microphone package is assembled in a portable electronic device (not shown), such as cellular phones or tablet computers, the acoustic hole of the MEMS microphone package needs to face a sound inlet disposed on a surface of a casing of the portable electronic device so as to enhance its quality of sound receiving. Moreover, in the current technology, when the acoustic hole of the MEMS microphone package needs to face another sound inlet disposed on another surface of the casing of the portable electronic device, the position of the MEMS microphone package in the portable electronic device needs to be changed. Thus, it is harder for the current MEMS microphone package to face different sound inlets disposed on different surfaces of a casing of the portable electronic device without changing the position of the MEMS microphone package, which means it diminishes the flexibility of the MEMS microphone package assembly.
- However, in the MEMS microphone package according to the embodiments of the disclosure (as shown in
FIG. 1A andFIG. 5 throughFIG. 7 ), when the boundary of the first hole of the substrate is disposed on the upper surface of the substrate (as shown inFIG. 3A throughFIG. 3D ) and the boundary of the second hole of the electrically conductive cover are disposed on the different planes, the MEMS microphone package (as shown inFIG. 1A andFIG. 5 throughFIG. 7 ) has more flexibility of the MEMS microphone package assembly. Specifically, when the MEMS microphone package (as shown inFIG. 1A andFIG. 5 throughFIG. 7 ) is assembled in the portable electronic device, the MEMS microphone package (as shown inFIG. 1A andFIG. 5 throughFIG. 7 ) can adopt a gasket to make one part of the acoustic holes (e.g., the first hole on the upper surface of the substrate) of the MEMS microphone package (as shown inFIG. 1A ) faces a sound inlet on a surface of the casing of the portable electronic device. Moreover, under the condition that the assembly position of the MEMS microphone package in the portable electronic device is not changed, another gasket can be adopted to make another part of acoustic holes (e.g., the second hole on the electrically conductive cover) of the MEMS microphone package to face another sound inlet on another surface of the casing of the portable electronic device. Hence, due to the non-coplanar boundary of the acoustic holes of the MEMS microphone package according to the embodiments of the disclosure, the flexibility of the MEMS microphone package assembly in the portable electronic device is increased. - To sum up, in the MEMS microphone package according to the embodiments of the disclosure, the acoustic hole of the MEMS microphone package is formed by both the first hole of the substrate and the second hole of the electrically conductive cover. That is, both the quality of directional sound receiving and the low profile of the MEMS microphone package can be maintained without considering the limitation of thickness of the substrate.
Claims (39)
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TW103142466A | 2014-12-05 | ||
TW103142466 | 2014-12-05 | ||
TW103142466A TWI539831B (en) | 2014-12-05 | 2014-12-05 | Mems microphone package |
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US9369788B1 US9369788B1 (en) | 2016-06-14 |
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Also Published As
Publication number | Publication date |
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TWI539831B (en) | 2016-06-21 |
CN105792083A (en) | 2016-07-20 |
CN105792083B (en) | 2019-01-18 |
US9369788B1 (en) | 2016-06-14 |
TW201622437A (en) | 2016-06-16 |
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