In-ear loudspeaker

Abstract

The utility model belongs to the technical field of loudspeakers, and discloses an in-ear loudspeaker, which comprises a shell and a vibrating diaphragm, the shell is provided with an inner cavity and a sound outlet, and the sound outlet is positioned on one side of the inner cavity; the vibrating diaphragm comprises a diaphragm and a dangling edge, the diaphragm is connected with the inner wall of the shell on one side, far away from the sound outlet, of the inner cavity, one end, close to the sound outlet, of the diaphragm can move relative to the other end, the dangling edge is connected between the outer wall of the diaphragm and the inner wall of the inner cavity, the dangling edge and the diaphragm are matched to divide the inner cavity into a front cavity and a rear cavity which are not communicated with each other, and the front cavity is communicated with the sound outlet; wherein the diaphragm is configured as an electrostrictive element or a magnetostrictive element. By arranging the diaphragm and the dangling edge, the vibrating diaphragm is a vibrating body and a voice diaphragm, so that the structure of the loudspeaker is greatly simplified, the production cost is reduced, the effective vibration quality is reduced, and the sound pressure level is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a loudspeaker technical field especially relates to an ear -inserting type loudspeaker. BACKGROUND

[0002] At present on the market, the loudspeaker (ie ear -inserting type loudspeaker) for earphone includes two kinds of sounding structure of moving coil type and moving iron type, and the ear -inserting type loudspeaker of moving coil type is actuated to sound through the voice coil in the working air gap, and the ear -inserting type loudspeaker of moving iron type is actuated to sound through the interaction between the armature and the magnet. However, the two kinds of ear -inserting type loudspeaker need to set up complex electromagnetic structure to drive the diaphragm vibration, not only the structure is complex, and the processing cost is high, and the effective vibration mass (the total mass of each component participating in vibration in the process of loudspeaker vibration) of loudspeaker is very big, and the sound pressure has obvious inhibitory effect, resulting in that the loudspeaker sounding effect is not ideal. SUMMARY

[0003] The utility model discloses an ear -inserting type loudspeaker, simple structure, low in production cost, and high sound pressure level and high audio fidelity.

[0004] To achieve this purpose, the utility model adopts the following technical scheme: an ear -inserting type loudspeaker, including shell and diaphragm, the shell is equipped with inner chamber and sound outlet, the sound outlet is located one side of the inner chamber, the diaphragm includes the diaphragm and the overhanging edge, the diaphragm is connected with the inner wall of the shell away from the sound outlet side of the inner chamber, and the diaphragm can be moved relative to the other end of the sound outlet side, the overhanging edge is connected between the outer wall of the diaphragm and the inner wall of the inner chamber, and the overhanging edge and the diaphragm cooperate to divide the inner chamber into front cavity and rear cavity that are not connected, and the front cavity and the sound outlet are communicated, wherein the diaphragm is configured as an electrostrictive element or a magnetostrictive element.

[0005] As preferred, two said diaphragms are arranged oppositely, and two said rear cavities are formed at two sides of the two said diaphragms opposite to each other, and the front cavity is formed between the two said diaphragms.

[0006] As preferred, a plurality of said inner chambers are provided, and the plurality of said inner chambers are separated from each other and arranged in a matrix type, one or two said diaphragms are provided in each said inner chamber, and the front cavities in the plurality of said inner chambers are communicated with the same said sound outlet.

[0007] As preferred, a plurality of said inner chambers are provided, and the plurality of said inner chambers are arranged at intervals in the height direction of the diaphragm, and the adjacent two said inner chambers are separated from each other by a first partition plate, one or two said diaphragms are provided in each said inner chamber, and the front cavities in the plurality of said inner chambers are communicated with the same said sound outlet.

[0008] As preferred, the inner cavities are provided in plurality, the plurality of inner cavities are arranged in the width direction of the diaphragm and are separated by second partitions, and one or two diaphragms are arranged in each of the inner cavities, and the front cavities in the plurality of inner cavities are communicated with the same sound outlet.

[0009] As preferred, the second partitions are provided with through grooves, and the front cavities in the adjacent two inner cavities are communicated through the through grooves.

[0010] As preferred, the electrostrictive element comprises a substrate and an electrostrictive body which is stretchable and is correspondingly attached to the surface of the substrate.

[0011] As preferred, the electrostrictive body is provided in plurality, and the plurality of electrostrictive bodies are symmetrically attached to the two sides of the substrate.

[0012] As preferred, the suspension edge is connected with the substrate.

[0013] As preferred, the back cavity is provided with a tuning hole which penetrates the shell in the thickness direction of the shell.

[0014] The diaphragm can vibrate under the action of the transformed electric field or magnetic field, the vibrating diaphragm interacts with the air in the front cavity and the back cavity and radiates sound pressure through the sound outlet. By setting the diaphragm and the suspension edge integrally formed, the diaphragm is both a vibrating body and a sound film, thereby the traditional electromagnetic driving structure is omitted, the structure of the loudspeaker is greatly simplified, the production cost is reduced, the effective vibrating mass is reduced, the sound pressure level is improved. And the back cavity does not need to reserve the mounting space of the traditional electromagnetic driving structure, the volume of the front cavity can be expanded, the vibrating amplitude of the diaphragm is ensured, the mechanical stability of the diaphragm is improved, the audio fidelity is improved, and the sound effect of the loudspeaker is optimized. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is the perspective view of the in-ear loudspeaker of the utility model;

[0016] Figure 2 is the installation schematic view of the diaphragm of the utility model;

[0017] Figure 3 is the sectional view of the in-ear loudspeaker of the first embodiment of the utility model;

[0018] Figure 4 is the sectional view of the in-ear loudspeaker of the second embodiment of the utility model;

[0019] Figure 5 is the half sectional view of the in-ear loudspeaker of the third embodiment of the utility model;

[0020] Figure 6is a sectional view of the in-ear loudspeaker of the fourth embodiment of the utility model;

[0021] Figure 7 is a front view of the in-ear loudspeaker of the fifth embodiment of the utility model.

[0022] In the figure: 100, shell;110, sound outlet;120, front cavity;130, rear cavity;131, tuning hole;140, first baffle;150, second baffle;151, through slot;200, diaphragm;210, membrane;211, base plate;212, electrostrictive body;220, suspension edge. DETAILED DESCRIPTION

[0023] The utility model will be further explained in detail in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model and are not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all the structures.

[0024] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated;It can be mechanically connected, or it can be electrically connected;It can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0025] In the utility model, unless otherwise explicitly specified and limited, the first feature is "on" or "below" the second feature, which can include direct contact between the first and second features, or indirect contact between the first and second features through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0026] In the description of the embodiment, the terms "up", "down", "right", etc. The orientation or position relationship shown in the drawing is only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0027] Referring to Figures 1 to 3 As shown in the drawings, the in-ear speaker provided by the embodiment of the present application comprises a shell 100 and a diaphragm 200. The shell 100 is provided with an inner cavity and a sound outlet 110. The sound outlet 110 is located at one side of the inner cavity and protrudes from the end surface of the shell 100.

[0028] The diaphragm 200 is matched with the cross-sectional shape of the inner cavity. The diaphragm 200 comprises a membrane 210 and a suspension edge 220. The membrane 210 is connected with the inner wall of the shell 100 at the side of the inner cavity away from the sound outlet 110. The end of the membrane 210 close to the sound outlet 110 can move relative to the other end. That is, except for the part connected with the inner wall of the inner cavity, the rest of the side wall of the membrane 210 is not rigidly constrained. The suspension edge 220 is connected between the outer wall of the membrane 210 and the inner wall of the inner cavity. The suspension edge 220 and the membrane 210 cooperate to divide the inner cavity into a front cavity 120 and a rear cavity 130 which are not connected with each other. The front cavity 120 is connected with the sound outlet 110. The membrane 210 is configured as an electrostrictive element or a magnetostrictive element.

[0029] It should be noted that the electrostrictive element is an element capable of rapidly stretching and deforming under the excitation of alternating current, thereby generating mechanical vibration with the same frequency as the alternating electric field (or generating alternating current when vibrating). The main materials thereof include electrostrictive polymers such as polyvinyl fluoride (PVDF), polyacrylonitrile (PAN) and the like, or electrostrictive ceramics, i.e. piezoelectric ceramics such as lead zirconium titanate (PZT) and lead magnesium niobate titanate (PMN-PT) and the like. The magnetostrictive element is an element capable of rapidly stretching and deforming under the excitation of an external alternating magnetic field, thereby generating mechanical vibration with the same frequency as the alternating magnetic field (or generating an alternating magnetic field when vibrating). The main materials thereof include metallic magnetostrictive materials or ferrite magnetostrictive materials. Since the electrostrictive element or the magnetostrictive element is mature in technology, there are various mature products to choose from, which will not be described here.

[0030] It can be understood that the diaphragm 200 can generate vibration under the action of the alternating electric field or the alternating magnetic field. The vibrating diaphragm 200 interacts with the air in the front cavity 120 and the rear cavity 130 and radiates sound pressure through the sound outlet 110. By providing the diaphragm 200 which is integrally formed with the membrane 210 and the suspension edge 220, the diaphragm 200 is both a vibrating body and a sound film, thereby eliminating the traditional electromagnetic driving structure, greatly simplifying the speaker structure, reducing the production cost, and at the same time reducing the effective vibrating mass and improving the sound pressure level. Moreover, the rear cavity 130 does not need to reserve the mounting space of the traditional electromagnetic driving structure, and the volume of the front cavity 120 can be expanded, so as to ensure that the diaphragm 200 obtains sufficient vibration amplitude, improve the mechanical stability of the diaphragm 200, improve the audio fidelity, and optimize the sound effect of the in-ear speaker.

[0031] It should be added that the length of the diaphragm 200 and the length of the sound outlet 110 have an impact on the sound pressure level of the in-ear speaker. Designers can use software simulation to obtain the length of the diaphragm 200 and the length of the sound outlet 110 corresponding to the target sound pressure level. There is no specific limitation on the length of the diaphragm 200 and the length of the sound outlet 110 here, as long as the sound pressure level of the in-ear speaker meets the design requirements.

[0032] Furthermore, the rear cavity 130 is provided with a tuning hole 131 . The tuning hole 131 is located on a side of the rear cavity 130 away from the sound outlet 110 . The tuning hole 131 passes through the housing 100 along the wall thickness direction of the housing 100 .

[0033] During vibration, the diaphragm 200 interacts with the air in the front cavity 120 and the air in the rear cavity 130. The tuning holes 131 allow air to flow freely in the rear cavity 130 of the speaker, preventing pressure buildup in the rear cavity 130. This improves the air pressure in the rear cavity 130, adjusts the low-frequency response, and enhances the clarity and transparency of the sound.

[0034] Reference Figure 2 and Figure 3 As shown, it can be understood that the electrostrictive element includes a substrate 211 and a stretchable electrostrictive body 212, which is bonded to the surface of the substrate 211. In this embodiment, the electrostrictive body 212 is described using piezoelectric ceramics as an example. However, piezoelectric ceramics can be replaced with other electrostrictive elements. The structure of the magnetostrictive element is essentially the same as that of the electrostrictive element, and other details are specifically explained here to avoid misunderstanding.

[0035] The piezoelectric ceramic is mounted on substrate 211, which provides stable support and fixation for the piezoelectric ceramic, preventing fatigue fracture during expansion and contraction, and improving the stability and durability of the piezoelectric ceramic. Furthermore, substrate 211 serves as a connection and support, facilitating the integration of the electrostrictive element into the inner cavity.

[0036] Furthermore, a plurality of electrostrictive bodies 212 are provided, and the plurality of electrostrictive bodies 212 are symmetrically attached to both sides of the substrate 211. The surface of the diaphragm 200 on the side of the substrate 211 facing the front cavity 120 forms a sound pressure radiation surface for radiating sound pressure.

[0037] Symmetrically arranging the electrostrictive body 212 (i.e., piezoelectric ceramics) and attaching them to the substrate 211 can ensure that the vibrations generated by the piezoelectric ceramics are uniform and stable when an electric field is applied, thereby improving the stability and response speed of the diaphragm 200, ensuring that the vibrations can be more effectively converted into sound output, and less likely to cause distortion or noise, thereby ensuring the stability and clarity of the sound.

[0038] Further, the suspension edge 220 is connected to the substrate 211 at the center of the piezoelectric ceramic arranged symmetrically.

[0039] The piezoelectric ceramic is arranged symmetrically, and the suspension edge 220 is connected to the substrate 211 at the center of the piezoelectric ceramic, which can optimize the stress distribution of the diaphragm 200, balance the electric field or mechanical stress received by the diaphragm 200, improve the structural rationality of the diaphragm 200, and prolong the service life of the diaphragm 200 and the whole in-ear speaker.

[0040] It should be noted that the diaphragm 200 composed of the diaphragm 210 (i.e., the electrostrictive element or magnetostrictive element) and the suspension edge 220 can be connected and formed by traditional welding and bonding technology, or can be integrally formed by MEMS (Micro-Electro-Mechanical System) technology, thereby improving the production efficiency of the diaphragm 200 and being suitable for mass production and low-cost production. In addition, the housing 100 and the diaphragm 200 can be integrated and manufactured by using the MEMS technology and process, thereby effectively improving the integrity and structural compactness of the in-ear speaker.

[0041] Referring to FIG. 1, Figure 4 It can be understood that two diaphragms 200 are arranged in the inner cavity, the two diaphragms 200 are oppositely arranged, two rear cavities 130 are respectively formed on the opposite sides of the two diaphragms 200, and a front cavity 120 is formed between the two diaphragms 200, or in other words, the two diaphragms 200 share the same front cavity 120.

[0042] By arranging two diaphragms 200, the two diaphragms 200 can move oppositely (i.e., the two diaphragms 200 move simultaneously and protrude towards the front cavity 120) or move reversely (i.e., the two diaphragms 200 move simultaneously and protrude towards the rear cavity 130) under the excitation of the audio signal, so that the sound pressures radiated by the sound pressure radiation surfaces of the two diaphragms 200 overlap, thereby ensuring the sound quality in the low and medium frequency bands.

[0043] In some embodiments, the diaphragm 200 has a rectangular shape, and at this time, the housing 100 has a rectangular shape matched with the diaphragm 200.

[0044] The diaphragm 200 is designed to have a rectangular shape, so that the user can directly use the existing mold of the moving-iron in-ear speaker to produce the housing 100, and the housing 100 can be directly installed in the existing in-ear earphone, thereby reducing the design and mold cost of the in-ear speaker.

[0045] In other embodiments, since the diaphragm 200 of the present application integrates the vibration body and the diaphragm of the traditional in-ear speaker, it is not necessary to arrange components such as the yoke, the coil, the magnet, and the ejector pin, and the diaphragm 200 can also be designed to have a semicircular shape or a trapezoidal shape, so as to adapt to different sound requirements and effectively improve the practicability of the in-ear speaker.

[0046] Referring to Figure 5 It can be understood that the inner cavities in the shell 100 are provided in plurality, the plurality of inner cavities are separated from each other and arranged in a matrix type, and one or two diaphragms 200 are respectively arranged in each inner cavity (the arrangement of one diaphragm 200 or the arrangement of two diaphragms 200 is described above and will not be repeated here). The front cavities 120 in the plurality of inner cavities are in communication with the same sound outlet 110.

[0047] It should be noted that, since the two adjacent inner cavities are separated from each other by the first partition plate 140, that is, the diaphragms 200 in the two adjacent inner cavities do not affect each other, at this time, the diaphragms 200 in the two adjacent inner cavities can be parallel to each other or perpendicular to each other, thereby optimizing the structural layout in the shell 100 and improving the space utilization inside the shell 100.

[0048] Regarding the inner cavities and the one or two diaphragms 200 inside as a sound generating unit, a plurality of sound generating units can be arranged in the same shell 100, and the plurality of sound generating units can be arranged in a matrix type. For example, the sound generating units can be arranged in the form of 2x2, 2x3, 3x3, etc. (that is, the plurality of sound generating units can form a planar array in the form of 2x2, 2x3, 3x3, etc.), thereby greatly improving the sound pressure level of the in-ear speaker. The diaphragms 200 in the plurality of inner cavities independently generate sound, and the sound pressures in the plurality of inner cavities are superimposed at the same sound outlet 110, thereby improving the volume, sound quality and sound richness of the in-ear speaker, and greatly improving the comprehensive quality of sound generation of the in-ear speaker.

[0049] Referring to Figure 6 It can be understood that the inner cavities in the shell 100 are provided in plurality, the plurality of inner cavities are separated from each other and arranged in a matrix type, and one or two diaphragms 200 are respectively arranged in each inner cavity (the arrangement of one diaphragm 200 or the arrangement of two diaphragms 200 is described above and will not be repeated here). The front cavities 120 in the plurality of inner cavities are in communication with the same sound outlet 110.

[0050] The plurality of inner cavities are arranged in the height direction of the diaphragm 200, without changing the width size of the shell 100, thereby adapting to the limited installation space in the earphone, improving the installation flexibility of the in-ear speaker under the premise of improving the sound generation quality of the in-ear speaker.

[0051] Further, the increased sound generating units can utilize the original front cavity 120 and rear cavity 130, so that the height size of the shell of the plurality of sound generating units is close to or equal to the height of the shell of a single sound generating unit, thereby increasing the number of sound generating units without changing the three-dimensional size of the shell, improving the sound pressure level, and enabling the in-ear speaker to be adaptively installed in the existing earphone.

[0052] It should be noted that when the sound emitting units are stacked along the height direction of the diaphragm 200 or the matrix type sound emitting units are stacked, a certain height (usually more than 0.1mm) should be reserved for the front cavity 120 and the rear cavity 130 to avoid the diaphragm 200 from hitting the cavity wall of the front cavity 120 or the rear cavity 130 when vibrating, thereby affecting the sound emitting effect.

[0053] Referring to Figure 7 As shown in the figure, it can be understood that a plurality of inner cavities are provided, the plurality of inner cavities are arranged at intervals in the width direction of the diaphragm 200, and the adjacent two inner cavities are separated from each other by the second partition plate 150, and one or two diaphragms 200 are respectively arranged in each inner cavity, in other words, the plurality of sound emitting units are linearly stacked in the width direction of the diaphragm 200. The front cavity 120 in the plurality of inner cavities is in communication with the same sound outlet 110.

[0054] The plurality of inner cavities are arranged at intervals in the width direction of the diaphragm 200, so that the shell 100 is flattened, thereby adapting to the limited installation space in the earphone, improving the installation flexibility of the in-ear loudspeaker under the premise of improving the sound emitting quality of the in-ear loudspeaker.

[0055] Further, the second partition plate 150 is provided with a through slot 151, and the front cavities 120 in the adjacent two inner cavities are in communication through the through slot 151, in other words, the diaphragms 200 in the adjacent two inner cavities share the same front cavity 120.

[0056] By arranging the through slot 151 to communicate the front cavities 120 of different inner cavities, the internal structure of the shell 100 is simplified, the design and manufacture of the shell 100 and the second partition plate 150 are facilitated, and the material cost of the in-ear loudspeaker is reduced.

[0057] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. An in-ear speaker, characterized by, The application relates to a loudspeaker, which comprises: a shell (100) provided with an inner cavity and a sound outlet (110) located on one side of the inner cavity; a diaphragm (200) comprising a membrane (210) and a suspension edge (220), wherein the membrane (210) is connected to the inner wall of the shell (100) on the side of the inner cavity away from the sound outlet (110), and one end of the membrane (210) close to the sound outlet (110) can move relative to the other end; the suspension edge (220) is connected between the outer wall of the membrane (210) and the inner wall of the inner cavity; the suspension edge (220) and the membrane (210) cooperate to divide the inner cavity into a front cavity (120) and a rear cavity (130) which are not connected to each other; and the front cavity (120) and the sound outlet (110) are communicated. The membrane (210) is configured as an electrostrictive element or a magnetostrictive element.

2. The in-ear speaker of claim 1, wherein, The inner cavity is provided with two diaphragms (200), the two diaphragms (200) are arranged oppositely, and two rear cavities (130) are formed on the two sides of the two diaphragms (200) respectively; and the front cavity (120) is formed between the two diaphragms (200).

3. The in-ear speaker of claim 1 or 2, wherein, The inner cavity is provided with a plurality of inner cavities which are separated from each other and arranged in a matrix type, one or two diaphragms (200) are arranged in each inner cavity, and the front cavities (120) in the plurality of inner cavities are communicated with the same sound outlet (110).

4. The in-ear speaker of claim 1 or 2, wherein, The inner cavity is provided with a plurality of inner cavities which are arranged at intervals in the height direction of the diaphragm (200) and are separated from each other by first partition plates (140), one or two diaphragms (200) are arranged in each inner cavity, and the front cavities (120) in the plurality of inner cavities are communicated with the same sound outlet (110).

5. The in-ear speaker of any of claims 1 or 2, wherein, The inner cavity is provided with a plurality of inner cavities which are arranged at intervals in the width direction of the diaphragm (200) and are separated from each other by second partition plates (150), one or two diaphragms (200) are arranged in each inner cavity, and the front cavities (120) in the plurality of inner cavities are communicated with the same sound outlet (110).

6. The in-ear speaker of claim 5, wherein, The second partition plate (150) is provided with a through groove (151), and the front cavities (120) in the adjacent two inner cavities are communicated through the through groove (151).

7. The in-ear speaker of any of claims 1 or 2, wherein, The electrostrictive element comprises a substrate (211) and an electrostrictive body (212) which can be stretched and contracted, and the electrostrictive body (212) is correspondingly attached to the surface of the substrate (211).

8. The in-ear speaker of claim 7, wherein, The electrostrictive body (212) is provided with a plurality of electrostrictive bodies (212) which are symmetrically attached to the two sides of the substrate (211).

9. The in-ear speaker of claim 8, wherein, The suspension edge (220) is connected to the substrate (211).

10. The in-ear speaker of claim 1 or 2, wherein, The rear cavity (130) is provided with a tuning hole (131) which penetrates the shell (100) in the thickness direction of the shell (100).

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