Abstract: The invention discloses a sounding unit and a sounding device, which relate to the technical field of sounding devices and solve the problem of low service life of the sounding unit. The sounding unit includes a vibrating plate, on which at least two first dividing grooves and at least two second dividing grooves are opened, the first dividing grooves and the second dividing grooves are arranged alternately in the surrounding direction, and the first dividing grooves The two ends of the two adjacent second dividing grooves respectively form overlaps in the direction of enclosing and arranging, and the overlapping part between the first dividing groove and the second dividing groove is a cantilever structure; the first dividing groove includes The center of the vibrating plate is recessed to form an inner recess, and the inner recess is located at the end of the second dividing groove, so as to increase the width of the cantilever structure at the end of the second dividing groove. The sound generating device includes the sound generating unit mentioned in the above solution.
Claims Translate1. A sounding unit, comprising a vibrating plate, is characterized in that:The vibrating plate is provided with at least two first dividing grooves and at least two second dividing grooves, at least two of the first dividing grooves are arranged to form a first ring, and at least two of the second The dividing grooves are arranged around to form a second ring body, and the first ring body is located inside or outside the second ring body;The first dividing grooves and the second dividing grooves are arranged alternately in the enclosing direction, and the two ends of the first dividing grooves are respectively connected to the adjacent two second dividing grooves in the enclosing and arranging direction. Forming an overlap, the overlapping part between the first dividing groove and the second dividing groove is a cantilever structure;The first dividing groove includes an inner recess formed inward toward the center of the vibration plate, and the inner recess is located at the end of the second dividing groove to increase the cantilever structure at the end of the second dividing groove. Width at the bottom position.2. The sounding unit according to claim 1, wherein the concave portion is an arc-shaped concave structure, the end of the second dividing groove is offset toward the arc-shaped concave structure, and the The ends of the second dividing grooves are provided with chamfers.3. The sound unit according to claim 2, characterized in that, the end of the first dividing groove is offset toward a side away from the second dividing groove, so as to increase the cantilever structure in the first dividing groove. Width at the ends of the split slot.4 . The sounding unit according to claim 3 , wherein the first dividing groove further comprises an arc-shaped transition portion between the inner concave portion and the end of the first dividing groove.5 . The sound generating unit according to claim 2 , wherein the first dividing groove further comprises a protrusion protruding toward a space between two adjacent second dividing grooves. 6 .6. The sound unit according to claim 1, characterized in that, the first ring body is located inside the second ring body;The first dividing groove and the second dividing groove jointly form a dividing pattern, and the dividing pattern is a symmetrical figure.7. The sound unit according to claim 1, characterized in that there are four first division grooves, four second division grooves, and four second division grooves are arranged around to form a square ring.8. The sound generating unit according to claim 1, further comprising an electrode plate and a dielectric layer, and a gap is formed between the electrode plate and the vibration plate through the dielectric layer;The first dividing groove and the second dividing groove divide the vibrating plate into a diaphragm, a cantilever structure and a fixed part;The thickness of the electrode plate is a, the thickness of the diaphragm is b, and a>1.5b.9. The sounding unit according to claim 8, characterized in that, the electrode plate is provided with a plurality of insulating bosses distributed in an array;The electrode plate is provided with a plurality of through holes, and the shape of the pattern formed by the plurality of through holes is consistent with the shape of the diaphragm, and the through holes are located in the first ring body and the second ring body inside.10. A sounding device, characterized by comprising the sounding unit according to any one of claims 1 to 9.Description Translatetechnical fieldThe invention relates to the technical field of sounding equipment, in particular to a sounding unit and a sounding device.Background techniqueA loudspeaker is a transducer device that converts electrical signals into acoustic signals. Loudspeakers are the basis for making audio equipment, acoustic active noise reduction equipment, etc. Therefore, the performance of loudspeakers has a key impact on the production of acoustic equipment. MEMS speakers (MicroElectroMechanicalSystem), that is, micro-electromechanical system speakers, have the advantages of good consistency, low power consumption, small size, and low price compared with traditional voice coil speakers.At present, the commonly used MEMS loudspeakers realize analog sound by pushing the air through the movement of the diaphragm. Usually, the MEMS loudspeaker includes a vibrating plate, and the vibrating plate is provided with a plurality of dividing grooves arranged around it, and two adjacent dividing grooves overlap each other. A cantilever is formed, and the dividing groove divides the vibrating plate into successively connected diaphragm, cantilever and fixed part. With this structure, the diaphragm can perform reciprocating motion under the elastic action of the cantilever to simulate sounding. However, when the diaphragm moves up and down, it will drive The cantilever is bent and deformed relative to the fixed part. At this time, the connection position between the cantilever and the fixed part is in a stress concentration position, which is prone to breakage or plastic deformation, resulting in failure and affecting the service life of the speaker.Contents of the inventionThe object of the present invention is to provide a sounding unit and a sounding device, so as to increase the strength of the cantilever in the sounding unit and increase the service life of the sounding unit.In order to achieve the above object, in the first aspect, the present invention provides a sound unit, including a vibrating plate, at least two first dividing grooves and at least two second dividing grooves are opened on the vibrating plate, and at least two first dividing grooves surround arranged to form a first ring body, at least two second dividing grooves are arranged around and arranged to form a second ring body, and the first ring body is located inside or outside the second ring body;The first dividing grooves and the second dividing grooves are arranged alternately in the enclosing direction, and the two ends of the first dividing grooves respectively overlap with two adjacent second dividing grooves in the direction of surrounding arrangement, and the first dividing grooves The overlapping part with the second dividing groove is a cantilever structure;The first division groove includes an inner recess formed inward toward the center of the vibrating plate, and the inner recess is located at the end of the second division groove, so as to increase the width of the cantilever structure at the end of the second division groove.In the case of adopting the above technical solution, the sound unit includes a vibrating plate, and at least two first dividing grooves and at least two second dividing grooves are opened on the vibrating plate, and the first dividing grooves and the second dividing grooves alternate in the enclosing direction It is set that the two ends of the first dividing groove overlap with two adjacent second dividing grooves in the direction of surrounding arrangement, and the overlapping part between the first dividing groove and the second dividing groove is a cantilever structure, The first division groove includes an inner recess formed inward toward the center of the vibrating plate, and the inner recess is located at the end of the second division groove; with this structure, the first division groove and the first division groove can be increased by setting the inner recess on the first division groove. The distance between the ends of the second dividing groove can further increase the width of the cantilever structure at the end of the second dividing groove, thereby improving the strength of the connection between the cantilever structure and the fixed part on the vibrating plate, and improving the use of the sound unit life.In some possible implementation manners, the concave portion is an arc-shaped concave structure, the end of the second dividing groove is offset toward the arc-shaped concave structure, and the end of the second dividing groove is provided with a chamfer. With such arrangement, the shape of the cantilever structure is optimized, and the strength of the cantilever structure is further improved.In some possible implementation manners, the end of the first dividing groove is offset toward a side away from the second dividing groove, so as to increase the width of the cantilever structure at the end of the first dividing groove. With such arrangement, the strength of the connection between the cantilever structure and the diaphragm on the vibrating plate is improved, and the service life of the sounding unit is improved.In some possible implementation manners, the first dividing groove further includes an arc-shaped transition portion between the inner recess and the end of the first dividing groove. Such an arrangement can further improve the strength of the cantilever structure.In some possible implementation manners, the first dividing groove further includes a protrusion protruding between two adjacent second dividing grooves. With such arrangement, the shape of the cantilever structure is optimized, the strength of the cantilever structure is further improved, and the area of the diaphragm can be increased at the same time.In some possible implementation manners, the first ring body is located inside the second ring body;The first dividing groove and the second dividing groove together form a dividing pattern, and the dividing pattern is a symmetrical figure. Such setting can make the force on the diaphragm more uniform, make the vibration more stable and controllable, and ensure that the sounding unit has good acoustic performance.In some possible implementation manners, there are four first dividing grooves, four second dividing grooves, and the four second dividing grooves are arranged around to form a square ring. With this arrangement, the layout position and number of the first dividing groove and the second dividing groove are optimized, so as to ensure that the sounding unit has good acoustic performance and improve the service life of the sounding unit.In some possible implementations, it also includes an electrode plate and a dielectric layer, and a gap is formed between the electrode plate and the vibrating plate through the dielectric layer;The first dividing groove and the second dividing groove divide the vibrating plate into a diaphragm, a cantilever structure and a fixed part;The thickness of the electrode plate is a, the thickness of the diaphragm is b, and a>1.5b. With such arrangement, the vibrating membrane can reciprocate under the elastic action of the cantilever structure to realize sounding. When the thickness of the electrode plate is greater than 1.5 times the thickness of the vibrating membrane, the sounding effect of the sounding unit can be improved.In some possible implementations, the electrode plate is provided with a plurality of insulating bosses distributed in an array; the electrode plate is provided with a plurality of through holes, and the shape of the pattern formed by the plurality of through holes is consistent with the shape of the diaphragm. Located inside the first ring body and the second ring body. Such an arrangement can make it easier to separate the diaphragm from the electrode plate, and improve the sound-generating effect of the diaphragm.In a second aspect, the present invention also provides a sounding device, including the sounding unit mentioned in the above solution.In the case of adopting the above technical solution, since the sounding device includes the sounding unit mentioned in the above solution, the strength of the cantilever in the sounding unit can be improved, and the service life of the sounding unit can be improved.Description of drawingsThe accompanying drawings described here are used to provide a further understanding of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute improper limitations to the present invention. In the attached picture:Fig. 1 is the schematic diagram of sound unit in the present invention;Fig. 2 is a schematic diagram one of a vibrating plate in the present invention;Fig. 3 is the second schematic diagram of the vibrating plate in the present invention;Fig. 4 is the schematic diagram three of vibrating plate in the present invention;Fig. 5 is the sectional view of sound unit in the present invention;Fig. 6 is the front view of electrode plate among the present invention;Fig. 7 is a top view of the electrode plate in the present invention.Reference signs:1-base, 2-electrode plate, 21-through hole, 22-insulation boss, 3-dielectric layer, 4-vibration plate, 41-fixed part, 42-cantilever structure, 43-diaphragm, 44-first division Groove, 441-protruding part, 442-inner concave part, 443-arc transition part, 45-second dividing groove.Detailed waysIn order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.It should be noted that when an element is referred to as being “fixed” or “disposed on” another element, it may be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined. "Several" means one or more than one, unless otherwise clearly and specifically defined.In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right" etc. are based on those shown in the accompanying drawings. Orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connection, or integral connection; can be mechanical connection or electrical connection; can be direct connection or indirect connection through an intermediary, and can be the internal communication of two elements or the interaction relationship between two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.Please refer to Fig. 1 to Fig. 7, in the first aspect, the embodiment of the present invention provides a sounding unit, including a vibrating plate 4, on which there are at least two first dividing grooves 44 and at least two second dividing grooves 45 , at least two first dividing grooves 44 are surrounded and arranged to form a first ring body, at least two second dividing grooves 45 are surrounded and arranged to form a second ring body, and the first ring body is located inside the second ring body Or the outside; the first dividing groove 44 and the second dividing groove 45 are arranged alternately in the enclosing direction, and the two ends of the first dividing groove 44 are respectively formed with the adjacent two second dividing grooves 45 in the direction of enclosing arrangement Overlapping, the overlapping part between the first dividing groove 44 and the second dividing groove 45 is a cantilever structure 42; the first dividing groove 44 includes an inner concave part 442 concavely formed toward the center of the vibrating plate 4, and the inner concave part 442 is located in the second The end position of the second dividing groove 45 is divided to increase the width of the cantilever structure 42 at the end position of the second dividing groove 45 . Exemplarily, the sound unit in this embodiment can be a MEMS speaker, MEMS speaker (MicroElectroMechanicalSystem), that is, a micro-electromechanical system speaker, which has good consistency, low power consumption, small size, and low price compared to traditional voice coil speakers. and other advantages.Under the situation of adopting above-mentioned technical scheme, sound unit comprises vibrating plate 4, offers at least two first dividing grooves 44 and at least two second dividing grooves 45 on vibrating plate 4, the first dividing groove 44 and the second dividing groove 45 Arranged alternately in the enclosing direction, the two ends of the first dividing groove 44 respectively overlap with two adjacent second dividing grooves 45 in the direction of surrounding arrangement, the first dividing groove 44 and the second dividing groove 45 The overlapping part is the cantilever structure 42, and the first dividing groove 44 includes an inner concave part 442 formed inward toward the center of the vibrating plate 4, and the inner concave part 442 is located at the end position of the second dividing groove 45; with this structure, through Setting the inner recess 442 on the first dividing groove 44 can increase the distance between the ends of the first dividing groove 44 and the second dividing groove 45, thereby increasing the width of the cantilever structure 42 at the end of the second dividing groove 45, Therefore, the strength of the connection between the cantilever structure 42 and the fixed part 41 on the vibrating plate 4 is improved, and the service life of the sounding unit is improved.It should be understood that the first dividing groove 44 and the second dividing groove 45 divide the vibrating plate 4 into the diaphragm 43 located in the surrounding area of the first dividing groove 44 and the second dividing groove 45 , and the diaphragm 43 located in the first dividing groove 44 and the second dividing groove 45 . The fixed part 41 outside the surrounding area of the two divided grooves 45 and the cantilever structure 42 connecting the diaphragm 43 and the fixed part 41, that is, the first divided groove 44 and the second divided groove 45 are arranged in two directions perpendicular to the surface of the vibrating plate 4. Both sides are open, so that the vibrating membrane 43 separated from the fixing part 41 is divided on the vibrating plate 4 .Exemplarily, as shown in FIG. 1 , the sounding unit further includes a base 1, an electrode plate 2 and a dielectric layer 3, the base 1, the electrode plate 2, the dielectric layer 3 and the vibration plate 4 are stacked in sequence, and the electrode plate 2 and the base 1 An air back cavity is formed between them, and the diaphragm 43 can reciprocate under the elastic action of the cantilever structure 42 to push air to realize simulated sound generation.As shown in Figures 1 to 4, further, the inner recess 442 is an arc-shaped concave structure, the end of the second dividing groove 45 is offset toward the arc-shaped concave structure, and the end of the second dividing groove 45 is provided with Chamfer. Exemplarily, the first end of the cantilever structure 42 is connected to the fixed portion 41 located at the end of the second dividing groove 45, the second end of the cantilever structure 42 is connected to the diaphragm 43 located at the end of the first dividing groove 44, and the cantilever structure The width of 42 gradually decreases from the first end to the second end. Exemplarily, the end of the first dividing groove 44 may also be chamfered. With this structure, the side of the end of the cantilever structure 42 connected to the fixed part 41 is a smooth and transitional arc structure, which is not easy to break when subjected to stress concentration, so that the strength of the cantilever structure 42 can be improved, and the vibrating plate can be improved. 4 and the service life of the sound unit.As shown in FIGS. 1 to 4 , further, the end of the first dividing groove 44 is offset toward a side away from the second dividing groove 45 to increase the width of the cantilever structure 42 at the end of the first dividing groove 44 . Exemplarily, the cantilever structure 42 further includes a narrow arm portion between the first end and the second end, the width of the cantilever structure 42 gradually decreases from the first end to the narrow arm portion, and gradually increases from the narrow arm portion to the second end. big. With this structure, when the vibrating membrane 43 moves up and down to drive the cantilever structure 42 to bend and deform relative to the fixed part 41, the connection position between the cantilever structure 42 and the vibrating membrane 43 is also in a stress concentration position, that is, the cantilever structure 42 is close to the first dividing groove 44 The part of the end is also under the environment of stress concentration. At this time, when the end of the first dividing groove 44 deviates toward the side away from the second dividing groove 45, the cantilever structure 42 can be increased at the end of the second dividing groove 45. The width of the central part can be increased, thereby improving the connection strength between the cantilever structure 42 and the diaphragm 43, thereby increasing the service life of the sounding unit.As shown in FIGS. 1 to 4 , further, the first dividing groove 44 further includes an arc-shaped transition portion 443 between the inner concave portion 442 and the end of the first dividing groove 44 . Exemplarily, the convex portion of the arc-shaped transition portion 443 faces to the side of the second dividing groove 45 . With this structure, the side of the cantilever structure 42 close to the first dividing groove 44 is an arc-shaped structure with a smooth transition, which is not easy to break when subjected to stress concentration, so that the strength of the cantilever structure 42 can be improved, and the vibrating plate can be improved. 4 and the service life of the sound unit.As shown in FIGS. 1 to 4 , further, the first dividing groove 44 further includes a protruding portion 441 protruding between two adjacent second dividing grooves 45 . Exemplarily, one first dividing groove 44 is provided with two inner recesses 442 , two arc-shaped transition portions 443 and one protrusion 441 , and the protrusion 441 is disposed between the two inner recesses 442 . With this structure, the vibrating plate 4 is divided by the protruding portion 441, the shape of the cantilever structure 42 can be further optimized, and the strength of the cantilever structure 42 can be improved; when the vibrating plate 4 is the structure shown in FIG. 2 and FIG. A split groove 44 forms the first ring body and is located inside the second ring body formed by a plurality of second split grooves 45. At this time, the protruding portion 441 is provided to increase the sound pressure level and sound generation of the diaphragm 43 by the area of the diaphragm 43. Effect.In some embodiments, the number of the first dividing grooves 44 can be two, three, four, five, etc., and the number of the second dividing grooves 45 can be two, three, four, five, etc., As shown in Figures 1 to 3, the number of the first dividing groove 44 and the second dividing groove 45 is four, as shown in Figure 4, the number of the first dividing groove 44 and the second dividing groove 45 is five . Exemplarily, the first ring body formed by surrounding and arranging a plurality of first division grooves 44 may be located inside or outside the second ring body formed by surrounding and arranging a plurality of second division grooves 45, as shown in Fig. 1 and Fig. 2 and 4, the first ring is located inside the second ring, and as shown in Figure 3, the first ring is located outside the second ring.As shown in FIG. 1 , FIG. 2 and FIG. 4 , further, the first ring body is located inside the second ring body; the first division groove 44 and the second division groove 45 together form a division pattern, and the division pattern is a symmetrical figure. Exemplarily, the division pattern can be an axisymmetric pattern or a rotationally symmetrical pattern. With this structure, under the premise of ensuring that the size of the vibrating plate 4 and the distance between the cantilever structure 42 and the edge of the vibrating plate 4 are consistent, relatively In the structure where the first ring body is located outside the second ring body, when the first ring body is located inside the second ring body, the area of the diaphragm 43 on the vibrating plate 4 is relatively large, which can increase the sound pressure level of the diaphragm 43 and sound effect; when the division pattern is a symmetrical figure, the force on the diaphragm 43 can be more uniform, and the vibration can be more stable and controllable, thereby ensuring that the sound unit has good acoustic performance.As shown in Figure 1, Figure 2 and Figure 4, further, there are four first dividing grooves 44, four second dividing grooves 45, and four second dividing grooves 45 are arranged around to form a square ring body. By adopting this structure, the arrangement position and arrangement quantity of the first dividing groove 44 and the second dividing groove 45 are optimized, so as to ensure that the sounding unit has good acoustic performance and improve the service life of the sounding unit.As shown in Figures 1 and 5, further, it also includes an electrode plate 2 and a dielectric layer 3, and a gap is formed between the electrode plate 2 and the vibrating plate 4 through the dielectric layer 3; the first dividing groove 44 and the second dividing groove 45 will The vibration plate 4 is divided into a diaphragm 43 , a cantilever structure 42 and a fixed part 41 ; the thickness of the electrode plate 2 is a, the thickness of the diaphragm 43 is b, and a>1.5b. Exemplarily, the base 1 has an opening, and the structure between the side of the diaphragm 43 facing the electrode plate 2 and the bottom of the opening forms an air back cavity, and the position of the electrode plate 2 corresponding to the air back cavity is provided with an array of through holes 21, Air damping is formed between the air flowing into the electrode plate 2 and the vibration through the through hole 21 . Exemplarily, the diameter of the through holes 21 may be 2 μm-20 μm, and the number of the through holes 21 may be 4-5000. With this structure, the electrode plate 2 and the vibration plate 4 form a plate capacitance, so that the diaphragm 43 can vibrate under the action of the electric field formed by the electrode plate 2 and the vibration plate 4; when the thickness of the electrode plate 2 is greater than 1.5 times the vibration When the film 43 is thicker, the sounding effect of the sounding unit can be improved.As shown in Figures 6 and 7, further, the electrode plate 2 is provided with a plurality of insulating bosses 22 distributed in an array; the electrode plate 2 is provided with a plurality of through holes 21, and the pattern shape formed by the plurality of through holes 21 Consistent with the shape of the diaphragm 43 , the through hole 21 is located inside the first ring body and the second ring body. With this structure, when the vibrating membrane 43 reciprocates to produce sound, the electrode plate 2 and the vibrating membrane 43 can be isolated by the insulating boss 22, so as to avoid the large intermolecular force between the vibrating membrane 43 and the electrode plate 2. The vibration of the diaphragm 43, so that the separation of the diaphragm 43 and the electrode plate 2 is easier, and the sound effect of the diaphragm 43 is improved; when the pattern shape formed by a plurality of through holes 21 is consistent with the shape of the diaphragm 43, the electrode plate can be The air pressure distribution between 2 and the vibrating plate 4 is more uniform, which further improves the sounding effect of the vibrating membrane 43.In a second aspect, the present invention also provides a sounding device, including the sounding unit mentioned in the above embodiment. Among them, the number of sounding units is multiple, and they are distributed in an array or in a linear shape, and each sounding unit can individually control the audio frequency and volume, and the digital control of the sound can be realized by matching multiple sounding units. The distribution structure of each sounding unit is not limited to array distribution or linear distribution, and other distribution structures can also be used.Under the situation of adopting above-mentioned technical scheme, sound unit comprises vibrating plate 4, offers at least two first dividing grooves 44 and at least two second dividing grooves 45 on vibrating plate 4, the first dividing groove 44 and the second dividing groove 45 Arranged alternately in the enclosing direction, the two ends of the first dividing groove 44 respectively overlap with two adjacent second dividing grooves 45 in the direction of surrounding arrangement, the first dividing groove 44 and the second dividing groove 45 The overlapping part is the cantilever structure 42, and the first dividing groove 44 includes an inner concave part 442 formed inward toward the center of the vibrating plate 4, and the inner concave part 442 is located at the end position of the second dividing groove 45; with this structure, through Setting the inner recess 442 on the first dividing groove 44 can increase the distance between the ends of the first dividing groove 44 and the second dividing groove 45, thereby increasing the width of the cantilever structure 42 at the end of the second dividing groove 45, Therefore, the strength of the connection between the cantilever structure 42 and the fixed part 41 on the vibrating plate 4 is improved, and the service life of the sounding unit is improved.In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in an appropriate manner.The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.
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