EP4584974A1 - Mikrofluidisches interaktionselement zur erzeugung und/oder erfassung eines volumenstroms eines fluids sowie eine akustische vorrichtung mit einem solchen mikrofluidischen interaktionselement - Google Patents
Mikrofluidisches interaktionselement zur erzeugung und/oder erfassung eines volumenstroms eines fluids sowie eine akustische vorrichtung mit einem solchen mikrofluidischen interaktionselementInfo
- Publication number
- EP4584974A1 EP4584974A1 EP23744706.5A EP23744706A EP4584974A1 EP 4584974 A1 EP4584974 A1 EP 4584974A1 EP 23744706 A EP23744706 A EP 23744706A EP 4584974 A1 EP4584974 A1 EP 4584974A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- microfluidic
- displacement
- cavity
- interaction element
- microfluidic interaction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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
Definitions
- Microfluidic interaction element for generating and/or detecting a volume flow of a fluid and an acoustic device with such a microfluidic interaction element
- the invention relates to a microfluidic interaction element for generating and/or detecting a volume flow of a fluid, which can be used in particular in a loudspeaker and/or a microphone.
- MEMS speakers and microphones have significant advantages over conventional electrodynamic speakers and microphones, e.g. B. in terms of lower latency, lower energy consumption, smaller size or the basic soldering capability.
- they currently still have deficits in terms of achievable sound levels.
- a correspondingly large volume of air must be displaced.
- the displaced volume can be maximized either by larger deflections of a moving displacement element, such as a membrane or a bending beam, and/or by increasing the area of the displacement element. Larger deflections are difficult to achieve for micromechanical components, on the one hand because of the lack of resilience of the materials/structures and, on the other hand, because of low force generation densities.
- Another disadvantage is that the bending beams used for actuation are not very mechanically robust and the slight variation in their manufacturing tolerances means that they do not move in phase, which reduces the achievable sound levels.
- the invention relates to a microfluidic interaction element for generating and/or detecting a volume flow of a fluid
- the microfluidic interaction element has a substrate with a cavity, the cavity having at least one vertically arranged, rigid wall element which is connected to a ceiling and a floor of the cavity is, and wherein furthermore a movable displacement element with vertical surfaces is arranged within the cavity in such a way that the direction of movement of the displacement element is essentially perpendicular to a main extension plane of the wall element, wherein the displacement element laterally encloses the respective wall element with its vertical surfaces in such a way that through the Wall element each has a first subspace and a second subspace formed within the displacement element, wherein the microfluidic interaction element each has a first breakthrough from the first subspace to an upper side of the substrate and a second breakthrough from the second subspace to a bottom.
- the microfluidic interaction element enables a very high conversion efficiency from electrical to acoustic energy in order to achieve correspondingly high sound pressure levels in that the displacement element can be set in motion by an actuator element. Further advantages are that the interaction element can be soldered because no magnet is integrated, has a low latency due to its low mass and can also be built very small. In addition, the interaction element is very robust and that, due to the corresponding one-piece design of the displacement element, all vertical surfaces of the displacement element can be moved in phase, which makes higher sound levels achievable.
- the microfluidic interaction element can be designed, for example, as a so-called MEMS element.
- a MEMS element is a micro-electro-mechanical system that combines or integrates electronic and mechanical components in a very small space.
- the displacement element By moving the displacement element horizontally towards a rigid wall element, a partial volume on this side is compressed, while the partial volume on the other side of the rigid wall is thinned, since the displacement element there moves away from the wall element. Fluid can flow out of the compressed partial volume into the environment through a fluid opening on a substrate surface, while fluid from the environment flows into the diluted partial volume through a further fluid opening on the opposite substrate surface.
- the MEMS element results in a net volume flow of the ambient fluid in a direction perpendicular to the main extension plane of the substrate. If the displacement element moves in the opposite direction, the flow direction of the fluid is reversed. In other words, an acoustic sound wave with positive and negative pressure half-waves can be generated in a fluid using the interaction element.
- the main extension plane of the wall element can also be slightly oblique with respect to the direction of movement of the displacement element.
- the term fluid refers to liquids and gases.
- the gas can, for example, be ordinary air, which is moved by means of the interaction element and whereby a volume flow is correspondingly generated. Volume flow therefore means a movement of the fluid. If implemented appropriately, this volume flow can generate a sound pressure level as an oscillating movement, which can be perceived by the human ear, for example.
- the term substrate can be understood to mean, for example, a silicon substrate which is used as a wafer substrate.
- the substrate is processed accordingly to create the microfluidic interaction element to produce.
- a recess is thus processed in the substrate, which forms the cavity with the corresponding openings between the cavity and the outside of the substrate.
- the recess in turn defines the interaction volume of the interaction element and is delimited from the environment by the substrate.
- One embodiment of the invention provides that the displacement element is connected to the substrate via a particularly resilient suspension.
- the advantage here is that the mobility of the displacement element can be ensured by the suspension. Due to the resilient design, the effort required to move the displacement element can also be reduced, since it returns independently to the original position in the event of a deflection.
- Suspension is to be understood as a component through which the displacement element is fixed to the substrate.
- One embodiment of the invention provides that the suspension is connected to a wall of the cavity.
- the advantage here is that this represents a simple and robust way to suspend the displacement element laterally in the cavity. It is conceivable here that the suspension is arranged either on the walls transverse to the direction of movement of the displacement element and/or on the walls in the direction of movement of the displacement element.
- the suspension is laterally enclosed by the displacement element.
- the advantage here is that it is a simple way to implement vertical suspension. Such a suspension is particularly particularly robust.
- the suspension is integrated vertically into the displacement element.
- Integrated here means that the suspension forms part of the displacement element.
- the microfluidic interaction element has an actuator area with an actuator element which is designed to drive the displacement element along the direction of movement, the actuator element being designed in particular as an electrostatic drive and / or as a piezoelectric drive.
- an externally driven volume flow of the fluid as an external sound pressure level sets the interaction element or, more precisely, the displacement element in motion. This can then be detected with the reverse actuator principle by the actuator element as a sensor element. A volume flow of a fluid can therefore also be recorded accordingly.
- the first breakthrough and/or the second breakthrough are each less than 200 pm, in particular less than 100 pm, wide and more than 100 pm, in particular more than 500 pm, long.
- the advantage here is that there is a low fluid resistance between the subspaces and the environment of the interaction element, which enables a simple volume flow of the fluid. This is important for the acoustic performance of the interaction element and in turn enables high sound pressure levels.
- a movable displacement element 50 with vertical surfaces 51 is arranged within the cavity 30 in such a way that the direction of movement x of the displacement element 50 is essentially perpendicular to the main extension planes of the wall elements 40.
- the respective wall elements 40 each have a transverse segment on both end faces 45 perpendicular to the main extension plane of the wall element 40.
- the microfluidic interaction element 10 each has a first breakthrough 61 from the first subspace 41 to an upper side 21 of the substrate 20 and a second breakthrough 62 from the second subspace 42 to one Underside 22 of the substrate 20, which is shown more clearly in particular in Fig. lb.
- the first breakthrough 61 and/or the second breakthrough 62 can each be less than 200 pm, in particular less than 100 pm, wide and more than 100 pm, in particular more than 500 pm, long.
- the displacement element 50 is connected to the substrate 20 via a particularly resilient suspension 70.
- the suspension 70 is connected to the walls 33 of the cavity 30, the suspension 70 being designed as a crossbar, which is aligned transversely to the direction of movement x of the displacement element 50 and is arranged on two sides of the displacement element 50 and is connected centrally to the displacement element 50.
- the microfluidic interaction element 10 has actuator regions 80, each with an actuator element, which drive the displacement element 50 along the movement direction x.
- the actuator elements can be designed, for example, as an electrostatic drive and/or as a piezoelectric drive.
- the actuator element can be arranged on the suspension 70.
- the interaction element 10 from FIG. la is again shown, but this time in a lateral cross section, which is taken along the sectional plane A shown in FIG. la.
- the substrate 20 is shown with the cavity 30, in which the rigid wall elements 40 and the displacement element 50, which is movable in the direction of movement x, are arranged with its vertical surfaces 51.
- the first partial spaces 41 and second partial spaces 42 formed by the corresponding design and arrangement of the wall elements 40 and the displacement element 50 can be seen, which lead the first openings 61 to the top 21 of the substrate 20 or the second openings 62 to the bottom 22 of the substrate 20 have.
- the vertical distance h between the displacement element 50 and the bottom 32 of the cavity 30 and/or between the displacement element 50 and the ceiling 31 of the cavity 30 is here smaller than 5pm, in particular smaller than 2pm.
- FIG. 4 shows a fourth exemplary embodiment of a microfluidic interaction element according to the invention in a sectional view as a top view.
- a microfluidic interaction element 310 is shown, which in turn differs from the interaction element 10 from FIG. la in the design of the suspension 370.
- the suspension 370 like the suspension 270 in FIG Displacement element 50 is integrated.
- the actuator region 80 with the actuator element is arranged directly on the displacement element 50, for example as a piezoelectric layer.
- An acoustic device 500 is shown, which can be designed, for example, as a loudspeaker and/or microphone.
- the acoustic device 500 has a plurality of microfluidic interaction elements 10, 110, 210, 310, 410, which are arranged next to one another in a plane.
- the loudspeaker can generate corresponding sound pressure levels.
- the interaction elements 10, 110, 210, 310, 410 can differ from each other in their lateral dimension and, for example, form a matrix arrangement.
- the interaction elements 10, 110, 210, 310, 410 can then be controlled by common or separately designed control lines (not shown in the picture).
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Micromachines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022209187.6A DE102022209187A1 (de) | 2022-09-05 | 2022-09-05 | Mikrofluidisches Interaktionselement zur Erzeugung und/oder Erfassung eines Volumenstroms eines Fluids sowie eine akustische Vorrichtung mit einem solchen mikrofluidischen Interaktionselement |
| PCT/EP2023/069478 WO2024051991A1 (de) | 2022-09-05 | 2023-07-13 | Mikrofluidisches interaktionselement zur erzeugung und/oder erfassung eines volumenstroms eines fluids sowie eine akustische vorrichtung mit einem solchen mikrofluidischen interaktionselement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4584974A1 true EP4584974A1 (de) | 2025-07-16 |
Family
ID=87429451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23744706.5A Pending EP4584974A1 (de) | 2022-09-05 | 2023-07-13 | Mikrofluidisches interaktionselement zur erzeugung und/oder erfassung eines volumenstroms eines fluids sowie eine akustische vorrichtung mit einem solchen mikrofluidischen interaktionselement |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4584974A1 (de) |
| CN (1) | CN119836792A (de) |
| DE (1) | DE102022209187A1 (de) |
| WO (1) | WO2024051991A1 (de) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102024203209A1 (de) * | 2024-04-09 | 2025-10-09 | Robert Bosch Gesellschaft mit beschränkter Haftung | Mikroelektromechanische Vorrichtung zur Wechselwirkung mit einem Fluid |
| DE102024204001A1 (de) * | 2024-04-29 | 2025-10-30 | Robert Bosch Gesellschaft mit beschränkter Haftung | Mikroelektromechanisches Bauelement und mikroelektromechanischer Lautsprecher |
| DE102024204997A1 (de) * | 2024-05-29 | 2025-12-04 | Robert Bosch Gesellschaft mit beschränkter Haftung | Mikroelektromechanisches Bauelement |
| GB2644267A (en) | 2024-08-19 | 2026-04-01 | Anglo American Technical & Sustainability Services Ltd | A method of and system for monitoring a mining operation |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005043674A (ja) * | 2003-07-22 | 2005-02-17 | Moritex Corp | くし型静電アクチュエータ及びくし型静電アクチュエータを用いた光制御装置 |
| KR100696913B1 (ko) * | 2005-03-11 | 2007-03-20 | 삼성전기주식회사 | 정전구동기를 구비한 잉크젯 헤드 및 그 제조방법 |
| DE102010029936A1 (de) | 2010-06-10 | 2011-12-15 | Robert Bosch Gmbh | Bauelement mit einer mikromechanischen Mikrofonsruktur |
| FR2963192B1 (fr) * | 2010-07-22 | 2013-07-19 | Commissariat Energie Atomique | Générateur d'impulsions de pression de type mems |
| DE102015210919A1 (de) | 2015-06-15 | 2016-12-15 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | MEMS-Wandler zum Interagieren mit einem Volumenstrom eines Fluids und Verfahren zum Herstellen desselben |
| DE102017206766A1 (de) * | 2017-04-21 | 2018-10-25 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Mems-wandler zum interagieren mit einem volumenstrom eines fluids und verfahren zum herstellen desselben |
| WO2022006817A1 (zh) | 2020-07-09 | 2022-01-13 | 诺思(天津)微系统有限责任公司 | Mems扬声器及其制造方法 |
| CN113163311B (zh) | 2021-04-12 | 2023-02-17 | 诺思(天津)微系统有限责任公司 | Mems扬声器和电子设备 |
-
2022
- 2022-09-05 DE DE102022209187.6A patent/DE102022209187A1/de active Pending
-
2023
- 2023-07-13 CN CN202380063802.4A patent/CN119836792A/zh active Pending
- 2023-07-13 WO PCT/EP2023/069478 patent/WO2024051991A1/de not_active Ceased
- 2023-07-13 EP EP23744706.5A patent/EP4584974A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024051991A1 (de) | 2024-03-14 |
| DE102022209187A1 (de) | 2024-03-07 |
| CN119836792A (zh) | 2025-04-15 |
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