US20200092655A1 - Speaker and mems actuator thereof - Google Patents
Speaker and mems actuator thereof Download PDFInfo
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- US20200092655A1 US20200092655A1 US16/297,725 US201916297725A US2020092655A1 US 20200092655 A1 US20200092655 A1 US 20200092655A1 US 201916297725 A US201916297725 A US 201916297725A US 2020092655 A1 US2020092655 A1 US 2020092655A1
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- 238000010168 coupling process Methods 0.000 claims abstract description 28
- 238000005859 coupling reaction Methods 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims description 88
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005389 semiconductor device fabrication Methods 0.000 description 1
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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
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
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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
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B3/00—Devices comprising flexible or deformable elements, e.g. comprising elastic tongues or membranes
- B81B3/0018—Structures acting upon the moving or flexible element for transforming energy into mechanical movement or vice versa, i.e. actuators, sensors, generators
- B81B3/0021—Transducers for transforming electrical into mechanical energy or vice versa
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B3/00—Devices comprising flexible or deformable elements, e.g. comprising elastic tongues or membranes
- B81B3/0035—Constitution or structural means for controlling the movement of the flexible or deformable elements
- B81B3/0037—For increasing stroke, i.e. achieve large displacement of actuated parts
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- H01L41/094—
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- H01L41/18—
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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
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/16—Mounting or tensioning of diaphragms or cones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/16—Mounting or tensioning of diaphragms or cones
- H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
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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
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
-
- 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
- H10N30/20—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators
- H10N30/204—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators using bending displacement, e.g. unimorph, bimorph or multimorph cantilever or membrane benders
- H10N30/2041—Beam type
- H10N30/2042—Cantilevers, i.e. having one fixed end
-
- 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
- H10N30/20—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators
- H10N30/204—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators using bending displacement, e.g. unimorph, bimorph or multimorph cantilever or membrane benders
- H10N30/2041—Beam type
- H10N30/2042—Cantilevers, i.e. having one fixed end
- H10N30/2044—Cantilevers, i.e. having one fixed end having multiple segments mechanically connected in series, e.g. zig-zag type
-
- 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
- H10N30/85—Piezoelectric or electrostrictive active materials
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- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B2201/00—Specific applications of microelectromechanical systems
- B81B2201/03—Microengines and actuators
- B81B2201/032—Bimorph and unimorph actuators, e.g. piezo and thermo
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B2203/00—Basic microelectromechanical structures
- B81B2203/01—Suspended structures, i.e. structures allowing a movement
- B81B2203/0127—Diaphragms, i.e. structures separating two media that can control the passage from one medium to another; Membranes, i.e. diaphragms with filtering function
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B2203/00—Basic microelectromechanical structures
- B81B2203/05—Type of movement
- B81B2203/053—Translation according to an axis perpendicular to the substrate
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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
- 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
- H04R2400/00—Loudspeakers
- H04R2400/11—Aspects regarding the frame of loudspeaker transducers
Definitions
- the present disclosure relates to a speaker, and more particularly, to a speaker equipped with a microelectromechanical system (MEMS) actuator.
- MEMS microelectromechanical system
- Speakers include a variety of different sizes to satisfy with actual demands.
- the wireless in-ear earphone allows the user to wear headphones to enjoy music in more situations, such as during exercises.
- Wireless in-ear headphones not only need to be small in their sizes, but also need to consume low power to meet the needs of long-term continuous use. How to output high sound quality in a small, low-power speaker is one of the product trends developed by speaker manufacturers.
- a speaker in one or more embodiments, includes a diaphragm and a MEMS actuator.
- the MEMS actuator includes a coupling member attached to the diaphragm and at least one closed cantilever ring that is surrounded around and connected to the coupling member by plural first bridge members, wherein the closed cantilever ring is configured to be electrically-biased to cause an axial movement of the coupling member and the diaphragm.
- a MEMS actuator is a flat-sheet component including a coupling member and a first closed cantilever ring that is surrounded around and connected to the coupling member by plural first bridge members, wherein the first closed cantilever ring has plural discontinuous first piezoelectric material sections, the plural discontinuous first piezoelectric material sections are configured to be electrically-biased to bend towards a normal direction of the flat-sheet component.
- the first closed cantilever ring is a circular closed cantilever ring.
- the flat-sheet component further includes plural outer bridge members to be connected to an outer support member.
- the outer support member includes an electrode member that is electrically connected to the plural discontinuous first piezoelectric material sections via the plural outer bridge members.
- the first closed cantilever ring has plural discontinuous second piezoelectric material sections that are electrically connected to the plural discontinuous first piezoelectric material sections.
- the flat-sheet component further includes plural second bridge members to be connected to a second closed cantilever ring.
- the second closed cantilever ring has plural discontinuous second piezoelectric material sections that are radially misaligned with the plural discontinuous first piezoelectric material sections of the first closed cantilever ring.
- the plural discontinuous second piezoelectric material sections of the second closed cantilever ring and the plural discontinuous first piezoelectric material sections of the first closed cantilever ring are electrically connected to each other and made from different materials.
- the plural discontinuous second piezoelectric material sections of the second closed cantilever ring and the plural discontinuous first piezoelectric material sections of the first closed cantilever ring are electrically connected to each other and applied with electrical biases of different polarities.
- the second closed cantilever ring has plural discontinuous second piezoelectric material sections, each first piezoelectric material section and each second piezoelectric material section, which are immediately-adjacent to a corresponding one of the second bridge members, are configured to be electrically-biased to bend towards opposite directions.
- the second closed cantilever ring has plural discontinuous second piezoelectric material sections, each first piezoelectric material section and each second piezoelectric material section, which are immediately-adjacent to a corresponding one of the second bridge members, are configured to be electrically-biased to bend towards opposite directions in the normal direction of the flat-sheet component.
- a first group of the first piezoelectric material sections immediately-adjacent to the first bridge members and a second group of the first piezoelectric material sections immediately-adjacent to the second bridge members are configured to be electrically-biased to bend towards opposite directions.
- first bridge members and the second bridge members are radially misaligned with each other.
- the first bridge members are spaced from each other with a uniform gap, or the second bridge members are spaced from each other with a uniform gap.
- the speaker and MEMS actuator disclosed herein utilizes its piezoelectric material section and closed cantilever rings arranged around the coupling member so as to generate a stable and greater axial deformation to move the diaphragm, thereby outputting high quality sounds.
- FIG. 1 illustrates a top view of a MEMS actuator according to one embodiment of the present disclosure
- FIG. 2 illustrates a top view of a MEMS actuator according to another embodiment of the present disclosure
- FIG. 3 illustrates a top view of a MEMS actuator according to another embodiment of the present disclosure
- FIG. 4 illustrates a side view of the MEMS actuator of FIG. 2 or FIG. 3 in operation
- FIG. 5 illustrates a side view of the MEMS actuator of FIG. 3 in operation
- FIG. 6 illustrates a top view of a MEMS actuator according to still another embodiment of the present disclosure
- FIG. 7 illustrates a top view of a MEMS actuator according to still another embodiment of the present disclosure.
- FIG. 8 illustrates a speaker equipped with MEMS actuator in operation according to an embodiment of the present disclosure.
- FIG. 1 illustrates a top view of a MEMS actuator 100 a according to one embodiment of the present disclosure.
- the MEMS actuator 100 a is a flat-sheet component including a coupling member 101 , a closed cantilever ring 102 and a closed cantilever ring 104 etc.
- the closed cantilever ring 102 is surrounded around the coupling member 101 and connected to the coupling member 103 by plural bridge members 103 .
- the closed cantilever ring 104 is surrounded around and connected to the closed cantilever ring 102 by plural bridge members 105 .
- the bridge members 107 may serve as outer bridge members for the closed cantilever ring 104 to be connected to an outer support member.
- the microelectromechanical system (MEMS) actuator is an actuator using modified semiconductor device fabrication technologies to integrate electronics and mechanical parts so as to reduce its power consumption and size.
- the closed cantilever ring 102 and the closed cantilever ring 104 may be circular closed cantilever rings, but not being limited thereto.
- the closed cantilever ring may be oval or polygonal closed cantilever ring.
- the plural bridge members 103 and bridge members 105 may be radially misaligned with each other to cause the MEMS actuator 100 a to have a more stable vibration with a larger axial deformation distance, and corresponding pairs of the plural bridge members 103 and bridge members 107 may be radially aligned with each other according to actual demands.
- the closed cantilever ring 102 and/or the closed cantilever ring 104 may have a uniform width, but not being limited thereto.
- the closed cantilever ring 102 has plural discontinuous piezoelectric material sections 102 a .
- the plural discontinuous piezoelectric material sections 102 a are configured to be electrically-biased to bend towards a normal direction of the flat-sheet component.
- each piezoelectric material section 102 a extend towards two opposite directions from a corresponding bridge member 105 in the closed cantilever ring 102 , but not being limited thereto.
- the closed cantilever ring 104 may have plural discontinuous piezoelectric material sections 104 a , and those piezoelectric material sections ( 102 a , 104 a ) may be radially misaligned with each other. Those piezoelectric material sections 104 a are configured to be electrically-biased to bend towards a normal direction of the flat-sheet MEMS actuator 100 a . When those piezoelectric material sections ( 102 a , 104 a ) are both configured to be electrically-biased to bend towards a normal direction of the MEMS actuator 100 a , such that a maximum deformation along the normal direction of the MEMS actuator 100 a will be prolonged. In this embodiment, each piezoelectric material section 104 a extends towards two opposite directions from a corresponding bridge member 107 in the closed cantilever ring 104 , but not being limited thereto.
- An outer support member of the MEMS actuator 100 a may further include an electrode member 108 that is electrically connected to the plural discontinuous piezoelectric material sections via the plural outer bridge members, e.g., 103 , 105 and 107 so as to supply power while operating the MEMS actuator.
- FIG. 2 illustrates a top view of a MEMS actuator according to another embodiment of the present disclosure.
- the MEMS actuator 100 b is a flat-sheet component, which is different from the MEMS actuator 100 a in the arrangement of piezoelectric material sections in the closed cantilever ring 104 .
- FIG. 4 illustrates a side view of the MEMS actuator of FIG. 2 in operation.
- the closed cantilever ring 104 has plural discontinuous piezoelectric material sections 104 b , and each pair of piezoelectric material sections ( 102 a , 104 b ), which are immediately-adjacent to a corresponding one of the second bridge members 105 , are configured to be electrically-biased to bend towards opposite directions.
- each piezoelectric material section 102 a has its two opposite ends bent towards a direction 120 a relative to the bridge member 105 to form an arc-shaped member
- the piezoelectric material section 104 b has its two opposite ends bent towards a direction 120 b relative to the bridge member 105 to form another arc-shaped member.
- the directions ( 120 a , 120 b ) are two opposite directions along the normal direction 120 of the flat-sheet actuator (referring also to FIG. 8 ).
- each piezoelectric material section 104 b extends towards two opposite directions from a corresponding bridge member 105 in the closed cantilever ring 104 , but not being limited thereto.
- FIG. 3 illustrating a top view of a MEMS actuator according to another embodiment of the present disclosure.
- the MEMS actuator 100 c is a flat-sheet component, which is different from the MEMS actuator 100 b in the arrangement of piezoelectric material sections in the closed cantilever rings ( 102 , 104 ).
- FIGS. 4, 5 both illustrate side views of the MEMS actuator of FIG. 3 in operation.
- the MEMS actuator 100 c is different from the MEMS actuator 100 b in that the closed cantilever ring 102 further includes plural discontinuous piezoelectric material sections 102 b , and the closed cantilever ring 104 further includes plural discontinuous piezoelectric material sections 104 a .
- those piezoelectric material sections 102 a are electrically connected with those piezoelectric material sections 102 b in the closed cantilever ring 102
- those piezoelectric material sections 104 a are electrically connected with those piezoelectric material sections 104 b in the closed cantilever ring 104 , but not being limited thereto.
- each pair of piezoelectric material sections ( 102 a , 104 b ), which are immediately-adjacent to a corresponding bridge member 105 , are configured to be electrically-biased to bend towards opposite directions.
- the piezoelectric material section 102 a has its two opposite ends bent towards a direction 120 a relative to the bridge member 105 to form an arc-shaped member while the piezoelectric material section 104 b has its two opposite ends bent towards a direction 120 b relative to the bridge member 105 to form another arc-shaped member.
- Each piezoelectric material section 102 b immediately-adjacent to a corresponding bridge member 103 and each piezoelectric material section 102 a immediately-adjacent to a corresponding bridge member 105 are configured to be electrically-biased to bend towards opposite directions.
- the piezoelectric material section 102 b has its two opposite ends bent towards a direction 120 b relative to the bridge member 103 to form an arc-shaped member while the piezoelectric material section 102 a has its two opposite ends bent towards a direction 120 a relative to the bridge member 105 to form another arc-shaped member.
- Each piezoelectric material section 102 b immediately-adjacent to a corresponding bridge member 103 and each piezoelectric material section 104 a immediately-adjacent to a corresponding bridge member 107 are configured to be electrically-biased to bend towards opposite directions.
- the piezoelectric material section 102 b has its two opposite ends bent towards a direction 120 b relative to the bridge member 103 to form an arc-shaped member while the piezoelectric material section 104 a has its two opposite ends bent towards a direction 120 a relative to bridge member 107 to form another arc-shaped member.
- the directions ( 120 a , 120 b ) are two opposite directions along the normal direction 120 of the flat-sheet actuator (referring also to FIG. 8 ).
- the MEMS actuator 100 c has such piezoelectric material section arrangement so as to generate a greater deformation than the MEMS actuator 100 b along the normal direction 120 .
- each piezoelectric material section 102 b extends towards two opposite directions from a corresponding bridge member 103 in the closed cantilever ring 102 , but not being limited thereto.
- Piezoelectric material sections electrically-biased to bend towards opposite directions may be realized by chosen different piezoelectric materials or applied with electrical biases of different polarities.
- the piezoelectric material section 102 a and the piezoelectric material section 104 b may be made from different piezoelectric materials, and are bent towards opposite directions while being applied with electrical biases of the same polarity.
- the piezoelectric material section 102 a and the piezoelectric material section 104 b may be made from the same piezoelectric materials, and are bent towards opposite directions while being applied with electrical biases of different polarities.
- the piezoelectric material sections 102 a and the piezoelectric material sections 104 b may be electrically connected with other, but not being limited thereto.
- FIG. 6 illustrates a top view of a MEMS actuator 100 d according to still another embodiment of the present disclosure.
- the MEMS actuator 100 d is a flat-sheet component, which is different from the previously-discussed MEMS actuators in the quantity of the closed cantilever ring.
- the MEMS actuator 100 d includes a coupling member 101 , a closed cantilever ring 102 , a closed cantilever ring 104 and a closed cantilever ring 106 etc.
- the closed cantilever ring 102 is surrounded around and connected to the coupling member 101 by the bridge members 103 .
- the closed cantilever ring 104 is surrounded around and connected to the closed cantilever ring 102 by the bridge members 105 .
- the closed cantilever ring 106 is surrounded around and connected to the closed cantilever ring 104 by the bridge members 107 .
- the closed cantilever ring 106 is connected to an outer support member by outer bridge members 109 .
- the closed cantilever rings 102 , 104 and 106 are spaced from each other by a uniform gap.
- those bridge members 103 are radially misaligned with those bridge members 105 while corresponding pairs of those bridge members ( 103 , 107 ) are radially aligned with each other, but not being limited thereto.
- those bridge members 105 are radially misaligned with those bridge members 107 while corresponding pairs of those bridge members ( 105 , 109 ) are radially aligned with each other, but not being limited thereto.
- those bridge members 103 are spaced from each other by a uniform gap
- those bridge members 105 are spaced from each other by a uniform gap
- those bridge members 107 are spaced from each other by a uniform gap
- those bridge members 109 are spaced from each other by a uniform gap, but not being limited thereto.
- FIG. 7 illustrates a top view of a MEMS actuator 100 e according to still another embodiment of the present disclosure.
- the MEMS actuator 100 e is a flat-sheet component, which is different from the previously-discussed MEMS actuators in the quantity of the bridge member.
- the MEMS actuator 100 e includes a coupling member 101 , a closed cantilever ring 102 and a closed cantilever ring 104 etc.
- the closed cantilever ring 102 is surrounded around and connected to the coupling member 101 by four bridge members 103 .
- the closed cantilever ring 104 is surrounded around and connected to the closed cantilever ring 102 by four bridge members 105 .
- the MEMS actuator 100 e is equipped with more bridge members between adjacent closed cantilever rings. More bridge members are beneficial to the operation stability for an overall actuator architecture.
- plural closed cantilever rings are surrounded around the coupling member as multiple concentric structures, e.g., those closed cantilever rings share a common center (i.e., a center of the coupling member), but not being limited thereto.
- FIG. 8 illustrates a speaker 200 equipped with MEMS actuator in operation according to an embodiment of the present disclosure.
- the speaker 200 includes a diaphragm 150 and a MEMS actuator, e.g., the MEMS actuator ( 100 a , 100 b , 100 c , 100 d or 100 e ).
- the coupling member 101 of the MEMS actuator may be connected to the diaphragm 150 directly or by an interface member 140 .
- the closed cantilever rings ( 102 , 104 ) are equipped with piezoelectric material sections, which are configured to be electrically-biased to generate an axial movement of the coupling member 101 and the diaphragm 150 along the normal direction 120 of the flat-sheet actuator.
- the speaker and MEMS actuator disclosed herein utilizes its piezoelectric material section and closed cantilever rings arranged around the coupling member so as to generate a stable and greater axial deformation to move the diaphragm, thereby outputting high quality sounds.
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Abstract
Description
- This application claims priority to Taiwan Application Serial Number 107132515, filed Sep. 14, 2018 which is herein incorporated by reference.
- The present disclosure relates to a speaker, and more particularly, to a speaker equipped with a microelectromechanical system (MEMS) actuator.
- Listening to music has become an indispensable part of modern life to regulate tension and monotony. Therefore, the sound quality of music produced by the speakers (such as speakers, headphones, etc.) of general consumer products and the experience of using the speaker to listening to music will affect consumption. As consumer demands for sound quality are also higher and higher, the requirements for speakers of general consumer products are increasingly taken care so as to improve the sound quality and the consumer experience.
- Speakers include a variety of different sizes to satisfy with actual demands. The wireless in-ear earphone allows the user to wear headphones to enjoy music in more situations, such as during exercises. Wireless in-ear headphones not only need to be small in their sizes, but also need to consume low power to meet the needs of long-term continuous use. How to output high sound quality in a small, low-power speaker is one of the product trends developed by speaker manufacturers.
- In one or more embodiments, a speaker includes a diaphragm and a MEMS actuator. The MEMS actuator includes a coupling member attached to the diaphragm and at least one closed cantilever ring that is surrounded around and connected to the coupling member by plural first bridge members, wherein the closed cantilever ring is configured to be electrically-biased to cause an axial movement of the coupling member and the diaphragm.
- In one or more embodiments, a MEMS actuator is a flat-sheet component including a coupling member and a first closed cantilever ring that is surrounded around and connected to the coupling member by plural first bridge members, wherein the first closed cantilever ring has plural discontinuous first piezoelectric material sections, the plural discontinuous first piezoelectric material sections are configured to be electrically-biased to bend towards a normal direction of the flat-sheet component.
- In one or more embodiments, the first closed cantilever ring is a circular closed cantilever ring.
- In one or more embodiments, the flat-sheet component further includes plural outer bridge members to be connected to an outer support member.
- In one or more embodiments, the outer support member includes an electrode member that is electrically connected to the plural discontinuous first piezoelectric material sections via the plural outer bridge members.
- In one or more embodiments, the first closed cantilever ring has plural discontinuous second piezoelectric material sections that are electrically connected to the plural discontinuous first piezoelectric material sections.
- In one or more embodiments, the flat-sheet component further includes plural second bridge members to be connected to a second closed cantilever ring.
- In one or more embodiments, the second closed cantilever ring has plural discontinuous second piezoelectric material sections that are radially misaligned with the plural discontinuous first piezoelectric material sections of the first closed cantilever ring.
- In one or more embodiments, the plural discontinuous second piezoelectric material sections of the second closed cantilever ring and the plural discontinuous first piezoelectric material sections of the first closed cantilever ring are electrically connected to each other and made from different materials.
- In one or more embodiments, the plural discontinuous second piezoelectric material sections of the second closed cantilever ring and the plural discontinuous first piezoelectric material sections of the first closed cantilever ring are electrically connected to each other and applied with electrical biases of different polarities.
- In one or more embodiments, the second closed cantilever ring has plural discontinuous second piezoelectric material sections, each first piezoelectric material section and each second piezoelectric material section, which are immediately-adjacent to a corresponding one of the second bridge members, are configured to be electrically-biased to bend towards opposite directions.
- In one or more embodiments, the second closed cantilever ring has plural discontinuous second piezoelectric material sections, each first piezoelectric material section and each second piezoelectric material section, which are immediately-adjacent to a corresponding one of the second bridge members, are configured to be electrically-biased to bend towards opposite directions in the normal direction of the flat-sheet component.
- In one or more embodiments, a first group of the first piezoelectric material sections immediately-adjacent to the first bridge members and a second group of the first piezoelectric material sections immediately-adjacent to the second bridge members are configured to be electrically-biased to bend towards opposite directions.
- In one or more embodiments, the first bridge members and the second bridge members are radially misaligned with each other.
- In one or more embodiments, the first bridge members are spaced from each other with a uniform gap, or the second bridge members are spaced from each other with a uniform gap.
- In sum, the speaker and MEMS actuator disclosed herein utilizes its piezoelectric material section and closed cantilever rings arranged around the coupling member so as to generate a stable and greater axial deformation to move the diaphragm, thereby outputting high quality sounds.
- It is to be understood that both the foregoing general description and the following detailed description are by examples, and are intended to provide further explanation of the invention as claimed.
- The invention can be more fully understood by reading the following detailed description of the embodiment, with reference made to the accompanying drawings as follows:
-
FIG. 1 illustrates a top view of a MEMS actuator according to one embodiment of the present disclosure; -
FIG. 2 illustrates a top view of a MEMS actuator according to another embodiment of the present disclosure; -
FIG. 3 illustrates a top view of a MEMS actuator according to another embodiment of the present disclosure; -
FIG. 4 illustrates a side view of the MEMS actuator ofFIG. 2 orFIG. 3 in operation; -
FIG. 5 illustrates a side view of the MEMS actuator ofFIG. 3 in operation; -
FIG. 6 illustrates a top view of a MEMS actuator according to still another embodiment of the present disclosure; -
FIG. 7 illustrates a top view of a MEMS actuator according to still another embodiment of the present disclosure; and -
FIG. 8 illustrates a speaker equipped with MEMS actuator in operation according to an embodiment of the present disclosure. - Reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.
- Reference is made to
FIG. 1 which illustrates a top view of aMEMS actuator 100 a according to one embodiment of the present disclosure. TheMEMS actuator 100 a is a flat-sheet component including acoupling member 101, a closedcantilever ring 102 and a closedcantilever ring 104 etc. The closedcantilever ring 102 is surrounded around thecoupling member 101 and connected to thecoupling member 103 byplural bridge members 103. The closedcantilever ring 104 is surrounded around and connected to the closedcantilever ring 102 byplural bridge members 105. Thebridge members 107 may serve as outer bridge members for the closedcantilever ring 104 to be connected to an outer support member. The microelectromechanical system (MEMS) actuator is an actuator using modified semiconductor device fabrication technologies to integrate electronics and mechanical parts so as to reduce its power consumption and size. - In this embodiment, the closed
cantilever ring 102 and the closedcantilever ring 104 may be circular closed cantilever rings, but not being limited thereto. For example, the closed cantilever ring may be oval or polygonal closed cantilever ring. - In this embodiment, the
plural bridge members 103 andbridge members 105 may be radially misaligned with each other to cause theMEMS actuator 100 a to have a more stable vibration with a larger axial deformation distance, and corresponding pairs of theplural bridge members 103 andbridge members 107 may be radially aligned with each other according to actual demands. - In this embodiment, the closed
cantilever ring 102 and/or the closedcantilever ring 104 may have a uniform width, but not being limited thereto. - The closed
cantilever ring 102 has plural discontinuouspiezoelectric material sections 102 a. The plural discontinuouspiezoelectric material sections 102 a are configured to be electrically-biased to bend towards a normal direction of the flat-sheet component. In this embodiment, eachpiezoelectric material section 102 a extend towards two opposite directions from acorresponding bridge member 105 in the closedcantilever ring 102, but not being limited thereto. - The closed
cantilever ring 104 may have plural discontinuouspiezoelectric material sections 104 a, and those piezoelectric material sections (102 a, 104 a) may be radially misaligned with each other. Thosepiezoelectric material sections 104 a are configured to be electrically-biased to bend towards a normal direction of the flat-sheet MEMS actuator 100 a. When those piezoelectric material sections (102 a, 104 a) are both configured to be electrically-biased to bend towards a normal direction of theMEMS actuator 100 a, such that a maximum deformation along the normal direction of theMEMS actuator 100 a will be prolonged. In this embodiment, eachpiezoelectric material section 104 a extends towards two opposite directions from acorresponding bridge member 107 in the closedcantilever ring 104, but not being limited thereto. - An outer support member of the MEMS
actuator 100 a may further include anelectrode member 108 that is electrically connected to the plural discontinuous piezoelectric material sections via the plural outer bridge members, e.g., 103, 105 and 107 so as to supply power while operating the MEMS actuator. - Reference is made to
FIG. 2 , which illustrates a top view of a MEMS actuator according to another embodiment of the present disclosure. TheMEMS actuator 100 b is a flat-sheet component, which is different from theMEMS actuator 100 a in the arrangement of piezoelectric material sections in the closedcantilever ring 104. - Reference is made to
FIGS. 2 and 4 , andFIG. 4 illustrates a side view of the MEMS actuator ofFIG. 2 in operation. Theclosed cantilever ring 104 has plural discontinuouspiezoelectric material sections 104 b, and each pair of piezoelectric material sections (102 a, 104 b), which are immediately-adjacent to a corresponding one of thesecond bridge members 105, are configured to be electrically-biased to bend towards opposite directions. For example, eachpiezoelectric material section 102 a has its two opposite ends bent towards adirection 120 a relative to thebridge member 105 to form an arc-shaped member, and thepiezoelectric material section 104 b has its two opposite ends bent towards adirection 120 b relative to thebridge member 105 to form another arc-shaped member. The directions (120 a, 120 b) are two opposite directions along thenormal direction 120 of the flat-sheet actuator (referring also toFIG. 8 ). In this embodiment, eachpiezoelectric material section 104 b extends towards two opposite directions from a correspondingbridge member 105 in theclosed cantilever ring 104, but not being limited thereto. - Reference is made to
FIG. 3 , which illustrating a top view of a MEMS actuator according to another embodiment of the present disclosure. The MEMS actuator 100 c is a flat-sheet component, which is different from theMEMS actuator 100 b in the arrangement of piezoelectric material sections in the closed cantilever rings (102, 104). - Reference is made to
FIGS. 3-5 .FIGS. 4, 5 both illustrate side views of the MEMS actuator ofFIG. 3 in operation. The MEMS actuator 100 c is different from theMEMS actuator 100 b in that theclosed cantilever ring 102 further includes plural discontinuouspiezoelectric material sections 102 b, and theclosed cantilever ring 104 further includes plural discontinuouspiezoelectric material sections 104 a. In this embodiment, thosepiezoelectric material sections 102 a are electrically connected with thosepiezoelectric material sections 102 b in theclosed cantilever ring 102, and thosepiezoelectric material sections 104 a are electrically connected with thosepiezoelectric material sections 104 b in theclosed cantilever ring 104, but not being limited thereto. - In this embodiment, each pair of piezoelectric material sections (102 a, 104 b), which are immediately-adjacent to a
corresponding bridge member 105, are configured to be electrically-biased to bend towards opposite directions. For example, thepiezoelectric material section 102 a has its two opposite ends bent towards adirection 120 a relative to thebridge member 105 to form an arc-shaped member while thepiezoelectric material section 104 b has its two opposite ends bent towards adirection 120 b relative to thebridge member 105 to form another arc-shaped member. Eachpiezoelectric material section 102 b immediately-adjacent to acorresponding bridge member 103 and eachpiezoelectric material section 102 a immediately-adjacent to acorresponding bridge member 105 are configured to be electrically-biased to bend towards opposite directions. For example, thepiezoelectric material section 102 b has its two opposite ends bent towards adirection 120 b relative to thebridge member 103 to form an arc-shaped member while thepiezoelectric material section 102 a has its two opposite ends bent towards adirection 120 a relative to thebridge member 105 to form another arc-shaped member. Eachpiezoelectric material section 102 b immediately-adjacent to acorresponding bridge member 103 and eachpiezoelectric material section 104 a immediately-adjacent to acorresponding bridge member 107 are configured to be electrically-biased to bend towards opposite directions. For example, thepiezoelectric material section 102 b has its two opposite ends bent towards adirection 120 b relative to thebridge member 103 to form an arc-shaped member while thepiezoelectric material section 104 a has its two opposite ends bent towards adirection 120 a relative to bridgemember 107 to form another arc-shaped member. The directions (120 a, 120 b) are two opposite directions along thenormal direction 120 of the flat-sheet actuator (referring also toFIG. 8 ). The MEMS actuator 100 c has such piezoelectric material section arrangement so as to generate a greater deformation than theMEMS actuator 100 b along thenormal direction 120. In this embodiment, eachpiezoelectric material section 102 b extends towards two opposite directions from a correspondingbridge member 103 in theclosed cantilever ring 102, but not being limited thereto. - Piezoelectric material sections electrically-biased to bend towards opposite directions may be realized by chosen different piezoelectric materials or applied with electrical biases of different polarities. For example, the
piezoelectric material section 102 a and thepiezoelectric material section 104 b may be made from different piezoelectric materials, and are bent towards opposite directions while being applied with electrical biases of the same polarity. Instead, thepiezoelectric material section 102 a and thepiezoelectric material section 104 b may be made from the same piezoelectric materials, and are bent towards opposite directions while being applied with electrical biases of different polarities. Thepiezoelectric material sections 102 a and thepiezoelectric material sections 104 b may be electrically connected with other, but not being limited thereto. - Reference is made to
FIG. 6 , which illustrates a top view of aMEMS actuator 100 d according to still another embodiment of the present disclosure. The MEMS actuator 100 d is a flat-sheet component, which is different from the previously-discussed MEMS actuators in the quantity of the closed cantilever ring. - The MEMS actuator 100 d includes a
coupling member 101, aclosed cantilever ring 102, aclosed cantilever ring 104 and aclosed cantilever ring 106 etc. Theclosed cantilever ring 102 is surrounded around and connected to thecoupling member 101 by thebridge members 103. Theclosed cantilever ring 104 is surrounded around and connected to theclosed cantilever ring 102 by thebridge members 105. Theclosed cantilever ring 106 is surrounded around and connected to theclosed cantilever ring 104 by thebridge members 107. Theclosed cantilever ring 106 is connected to an outer support member byouter bridge members 109. The closed cantilever rings 102, 104 and 106 are spaced from each other by a uniform gap. - In the above-discussed embodiments, those
bridge members 103 are radially misaligned with thosebridge members 105 while corresponding pairs of those bridge members (103, 107) are radially aligned with each other, but not being limited thereto. Thosebridge members 105 are radially misaligned with thosebridge members 107 while corresponding pairs of those bridge members (105, 109) are radially aligned with each other, but not being limited thereto. - In the above-discussed embodiments, those
bridge members 103 are spaced from each other by a uniform gap, thosebridge members 105 are spaced from each other by a uniform gap, thosebridge members 107 are spaced from each other by a uniform gap, and thosebridge members 109 are spaced from each other by a uniform gap, but not being limited thereto. - Reference is made to
FIG. 7 , which illustrates a top view of a MEMS actuator 100 e according to still another embodiment of the present disclosure. The MEMS actuator 100 e is a flat-sheet component, which is different from the previously-discussed MEMS actuators in the quantity of the bridge member. - The MEMS actuator 100 e includes a
coupling member 101, aclosed cantilever ring 102 and aclosed cantilever ring 104 etc. Theclosed cantilever ring 102 is surrounded around and connected to thecoupling member 101 by fourbridge members 103. Theclosed cantilever ring 104 is surrounded around and connected to theclosed cantilever ring 102 by fourbridge members 105. Compared with the previously-discussed MEMS actuators, the MEMS actuator 100 e is equipped with more bridge members between adjacent closed cantilever rings. More bridge members are beneficial to the operation stability for an overall actuator architecture. - In the above-discussed embodiments, plural closed cantilever rings are surrounded around the coupling member as multiple concentric structures, e.g., those closed cantilever rings share a common center (i.e., a center of the coupling member), but not being limited thereto.
- Reference is made to
FIG. 8 illustrates aspeaker 200 equipped with MEMS actuator in operation according to an embodiment of the present disclosure. Thespeaker 200 includes adiaphragm 150 and a MEMS actuator, e.g., the MEMS actuator (100 a, 100 b, 100 c, 100 d or 100 e). Thecoupling member 101 of the MEMS actuator may be connected to thediaphragm 150 directly or by aninterface member 140. As discussed in previous embodiments, the closed cantilever rings (102, 104) are equipped with piezoelectric material sections, which are configured to be electrically-biased to generate an axial movement of thecoupling member 101 and thediaphragm 150 along thenormal direction 120 of the flat-sheet actuator. - In sum, the speaker and MEMS actuator disclosed herein utilizes its piezoelectric material section and closed cantilever rings arranged around the coupling member so as to generate a stable and greater axial deformation to move the diaphragm, thereby outputting high quality sounds.
- Although the present invention has been described in considerable detail with reference to certain embodiments thereof, other embodiments are possible. Therefore, the spirit and scope of the appended claims should not be limited to the description of the embodiments contained herein.
- It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims.
Claims (15)
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TW107132515A TWI684367B (en) | 2018-09-14 | 2018-09-14 | Speaker and microelectromechanical actuator thereof |
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US10609491B1 (en) | 2020-03-31 |
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CN109618268B (en) | 2021-03-16 |
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