Electroacoustic transducer

Abstract

The utility model discloses an electro-acoustic transducer, which comprises a hollow disc body, the hollow disc body is a disc-shaped main body with a hollow inside, and a resonant cavity is formed at the hollow part. The planar center region of the hollow disk body defines a geometric center axis. The side surface of the hollow disc body is provided with a side-out sound raising hole, and the side-out sound raising hole defines a lateral propagation axis which is substantially orthogonal to the geometric center axis. And the hole height of the side-outlet raising hole is the same as the thickness of the resonant cavity. By means of the structural design, the application range of the electroacoustic transducer is widened.

Description

Technical Field

[0001] The utility model relates to the field of electroacoustic transducing devices, and particularly to an electroacoustic transducer applied to earphones. Background Art

[0002] Acoustic transducers play an important role in converting electrical signals into sound signals and have become an indispensable part of modern multimedia devices. They can be found in, for example, free-field sound devices such as integrated or standalone speakers, or pressure-field sound devices such as wearable earphones. As portable multimedia devices continue to seek to reduce their form factors, reducing the size of the sound-generating components while maintaining / improving their output capabilities to ensure sound quality has become a challenge.

[0003] With the development of technology, the application of acoustic transducers is becoming increasingly widespread. For example, in the case of TWS (True Wireless Stereo) earphones, people require them to have more and more functions and a battery life of more than one level. Thus, it is necessary to set multiple chips and batteries in the earphones, which will compress the internal usable space of the acoustic transducers.

[0004] Please refer to Figure 1 , which is an exploded schematic view of an acoustic transducer 100 in the prior art. The acoustic transducer 100 is, for example, an earphone. The sound-emitting direction, central axis, and the sound-emitting hole direction of the earphone housing of its sound-emitting unit 1 are the same (coaxial or parallel, such as direction D). Thus, the sound-emitting unit 1 will greatly occupy the space inside the earphone housing. The number and volume of chips, passive components, and batteries that can be arranged inside the earphone housing are limited, which is not conducive to the development of the aforementioned acoustic transducer 100 that needs to have multiple functions and a long battery life. Summary of the Utility Model

[0005] The utility model provides an electroacoustic transducer, which includes a hollow disk body, which is a disk-shaped main body with a hollow interior, and a resonance cavity is formed at the hollow part. A geometric central axis is defined in the central area of a plane of the hollow disk body. A side sound-emitting hole is provided on the side surface of the hollow disk body, and the side sound-emitting hole defines a lateral propagation axis that is substantially orthogonal to the geometric central axis. The hole height of the side sound-emitting hole is the same as at least a part of the thickness of the resonance cavity.

[0006] According to a feasible implementation, the hollow disk body includes a pair of parallel plate-like members.

[0007] According to a feasible implementation, a central sound-transmitting port is provided in the central area of at least one of the pair of plate-like members. The central sound-transmitting port defines a path for entering and exiting the resonance cavity inside the hollow disk body. This path defines a forward propagation axis that is substantially coaxial with the geometric central axis of the hollow disk body.

[0008] According to a feasible implementation, at least one of a pair of plate-like members is an active sound generating member.

[0009] According to a feasible implementation, the active sound generating member includes a resonance plate and a piezoelectric member attached to the resonance plate.

[0010] According to a feasible implementation, the piezoelectric member is located within a resonance cavity.

[0011] According to a feasible implementation, the outer diameter of the resonance plate is larger than the outer diameter of the piezoelectric member. The piezoelectric member and the resonance plate are coupled concentrically with each other.

[0012] According to a feasible implementation, both the piezoelectric member and the resonance plate have a rectangular planar profile. A side sound outlet hole is formed on a short side of the rectangular planar profile of the resonance plate.

[0013] According to a feasible implementation, the piezoelectric member and the resonance plate have a substantially circular planar profile. A side sound outlet hole is formed on a chord corresponding to a central angle of the circular planar profile of the resonance plate. The range of the central angle is from 12 degrees to 41 degrees.

[0014] According to a feasible implementation, the planar profile of the resonance plate defines a radius passing through the geometric central axis. The side sound outlet hole is formed on a chord length corresponding to the radius, and the chord distance corresponding to the chord length defines a lateral propagation axis. The ratio of the chord distance to the radius ranges from 70% to 79.5%.

[0015] According to a feasible implementation, the ratio of the opening area of the side sound outlet hole to that of a central sound transmission port ranges from 4.9% to 15.3%.

[0016] According to a feasible implementation, the central sound transmission ports are respectively formed in the central regions of a pair of plate-like members. An annular opening is formed between the two central sound transmission ports, and the annular opening defines a path for entering and exiting the resonance cavity within the hollow disc body.

[0017] According to a feasible implementation, the electroacoustic transducer further includes a peripheral enclosure structure, which is joined to the outer edge portions of the two resonance plates, thereby defining a resonance cavity located between the pair of plate-like members.

[0018] According to a feasible implementation, the resonance plate includes a flat central well portion, a base portion disposed opposite to the central well portion, an annular lip portion rising from the central well portion, and an edge portion surrounding the periphery of the annular lip portion.

[0019] According to a feasible implementation, the electroacoustic transducer further includes an annular gasket disposed between the pair of plate-like members, and the annular gasket jointly forms the resonance cavity. At least a part of the outer surface of the annular gasket forms the peripheral enclosure structure of the hollow disc body.

[0020] According to a feasible implementation, the electroacoustic transducer further includes a hollow encapsulation body for accommodating the hollow disk body, and the hollow encapsulation body is configured to suspend the hollow disk body therein. A side sound outlet hole is provided on the side surface of the hollow encapsulation body and is in the same direction as the lateral propagation axis of the hollow disk body.

[0021] The present utility model also provides an electroacoustic transducer, which includes a hollow disk body. The hollow disk body is a disk-shaped main body with a hollow interior, and a resonance cavity is formed at the hollow part. At least one central sound transmission port is provided in the central area of the disk-shaped main body. The central sound transmission port defines a path for entering and exiting the resonance cavity inside the hollow disk body. The path defines a forward propagation axis that is substantially orthogonal to the hollow disk body. A side sound outlet hole is also provided on the side surface of the hollow disk body, and the side sound outlet hole defines a lateral propagation axis that is substantially orthogonal to the forward propagation axis.

[0022] According to another feasible implementation, the hole height of the side sound outlet hole is the same as at least a part of the thickness of the resonance cavity.

[0023] According to another feasible implementation, the hollow disk body includes a pair of parallel plate-like members.

[0024] According to another feasible implementation, at least one of the pair of plate-like members is an active sound generating member.

[0025] According to another feasible implementation, the active sound generating member includes a resonance plate and a piezoelectric member attached to the resonance plate.

[0026] According to another feasible implementation, the piezoelectric member is located inside the resonance cavity.

[0027] According to another feasible implementation, the outer diameter of the resonance plate is larger than the outer diameter of the piezoelectric member, and the piezoelectric member and the resonance plate are coupled concentrically with each other.

[0028] According to another feasible implementation, both the piezoelectric member and the resonance plate have a rectangular planar profile, and the side sound outlet hole is provided on the short side of the rectangular planar profile of the resonance plate.

[0029] According to another feasible implementation, the piezoelectric member and the resonance plate have a substantially circular planar profile. The side sound outlet hole is provided on a chord corresponding to a central angle of the circular planar profile of the resonance plate. The range of the central angle is from 12 degrees to 41 degrees.

[0030] According to another feasible implementation, the planar profile of the resonance plate defines a radius passing through the geometric central axis. The side sound outlet hole is formed on the chord length corresponding to the radius, and the chord distance corresponding to the chord length defines the lateral propagation axis. The ratio of the chord distance to the radius ranges from 70% to 79.5%.

[0031] According to another feasible implementation, the ratio of the opening area of the side sound outlet hole to the opening area of the central sound transmission port ranges from 4.9% to 15.3%.

[0032] According to another feasible embodiment, the central sound transmission openings are respectively formed in the central regions of a pair of plate-like members, and an annular opening is formed between the two central sound transmission openings, and the annular opening defines a path for entering and exiting the resonance cavity inside the hollow disk.

[0033] According to another feasible embodiment, the electroacoustic transducer further includes a peripheral enclosure structure, which is joined to the outer edge portions of the two resonance plates, thereby defining a resonance cavity located between the pair of plate-like members.

[0034] According to another feasible embodiment, the resonance plate includes a flat central well portion, a base portion disposed opposite to the central well portion, an annular lip portion raised from the central well portion, and an edge portion surrounding the periphery of the annular lip portion.

[0035] According to another feasible embodiment, the electroacoustic transducer further includes an annular gasket disposed between the pair of plate-like members, and the annular gasket together forms a resonance cavity, and the outer surface of the annular gasket at least partially forms the peripheral enclosure structure of the hollow disk.

[0036] According to another feasible embodiment, the electroacoustic transducer further includes a hollow encapsulation body for accommodating the hollow disk, the hollow encapsulation body is configured to suspend the hollow disk therein, and a side sound outlet hole is formed on the side surface of the hollow encapsulation body in the same direction as the lateral propagation axis of the hollow disk.

[0037] The present utility model further provides an electroacoustic transducer, which includes a hollow disk and a hollow encapsulation body. The hollow disk is a disk-shaped main body with a hollow interior, and a resonance cavity is formed at the hollow portion. At least one central sound transmission opening is formed in the central region of the disk-shaped main body. The central sound transmission opening defines a path for entering and exiting the resonance cavity inside the hollow disk. The path defines a forward propagation axis that is substantially orthogonal to the hollow disk. The hollow encapsulation body is configured to substantially suspend the hollow disk therein, and the side surface of the hollow encapsulation body has a side sound outlet hole disposed in a direction substantially orthogonal to the forward propagation axis of the hollow disk.

[0038] According to yet another feasible embodiment, a side sound outlet hole is further provided on the side surface of the hollow disk, and the side sound outlet hole defines a lateral propagation axis that is substantially orthogonal to the forward propagation axis.

[0039] According to yet another feasible embodiment, the hole height of the side sound outlet hole is the same as at least a part of the thickness of the resonance cavity.

[0040] According to yet another feasible embodiment, the hollow disk includes a pair of parallel plate-like members.

[0041] According to yet another feasible embodiment, at least one of the pair of plate-like members is an active sound generating member.

[0042] According to another feasible implementation, the active sound generating component includes a resonance plate and a piezoelectric component attached to the resonance plate.

[0043] According to another feasible implementation, the piezoelectric component is located within the resonance cavity.

[0044] According to another feasible implementation, the outer diameter of the resonance plate is larger than the outer diameter of the piezoelectric component. The piezoelectric component and the resonance plate are coupled concentrically with each other.

[0045] According to another feasible implementation, both the piezoelectric component and the resonance plate have a rectangular planar profile. The side sound outlet hole is opened on a short side of the rectangular planar profile of the resonance plate.

[0046] According to another feasible implementation, the piezoelectric component and the resonance plate have a substantially circular planar profile. The side sound outlet hole is opened on a chord corresponding to a central angle of the circular planar profile of the resonance plate. The range of the central angle is from 12 degrees to 41 degrees.

[0047] According to another feasible implementation, the planar profile of the resonance plate defines a radius passing through the geometric central axis. The side sound outlet hole is formed on a chord length corresponding to the radius, and the chord distance corresponding to the chord length defines the lateral propagation axis. The ratio of the chord distance to the radius ranges from 70% to 79.5%.

[0048] According to another feasible implementation, the ratio of the opening area of the side sound outlet hole to that of the central sound transmission port ranges from 4.9% to 15.3%.

[0049] According to another feasible implementation, the central sound transmission ports are respectively opened in a central area of each of a pair of plate-like components. An annular opening is formed between the two central sound transmission ports, and the annular opening defines a path for entering and exiting the resonance cavity within the hollow disk body.

[0050] According to another feasible implementation, the electroacoustic transducer further includes a peripheral enclosure structure, which is joined to the outer edge portions of the two resonance plates, thereby defining the resonance cavity located between the pair of plate-like components.

[0051] According to another feasible implementation, the resonance plate includes a flat central well portion, a base portion disposed opposite to the central well portion, an annular lip portion rising from the central well portion, and an edge portion surrounding the periphery of the annular lip portion.

[0052] According to another feasible implementation, the electroacoustic transducer further includes an annular gasket disposed between the pair of plate-like components, and the annular gasket together forms the resonance cavity. At least a part of the outer surface of the annular gasket forms the peripheral enclosure structure of the hollow disk body.

[0053] According to an embodiment of the present utility model, the hollow disk body of the electroacoustic transducer has side sound-emitting holes for lateral sound emission, and the lateral propagation axis of the side sound-emitting holes is orthogonal to the geometric central axis. With this structure, the available space inside the electroacoustic transducer is increased, and multiple chips or / and large-sized batteries can be arranged to meet the requirements of the electroacoustic transducer for small size, multiple functions, and long battery life.

[0054] To further understand the features and technical content of the utility model, please refer to the following detailed description of the utility model and the accompanying drawings. However, the provided drawings are only for reference and illustration and are not used to limit the utility model. Brief Description of the Drawings

[0055] Figure 1 Is an exploded schematic view of an acoustic transducer in the prior art.

[0056] Figure 2 Is an external view schematic diagram of an electroacoustic transducer according to an embodiment of the present utility model.

[0057] Figure 3A Is an external view schematic diagram of an electroacoustic transducer according to an embodiment of the present utility model.

[0058] Figure 3B Is Figure 3A A partial cross-sectional schematic diagram of the illustrated embodiment, showing the resonance cavity structure.

[0059] Figure 4A Is an external view schematic diagram of an electroacoustic transducer according to an embodiment of the present utility model.

[0060] Figure 4B Is Figure 4A A partial cross-sectional schematic diagram of the illustrated embodiment, showing the resonance cavity structure.

[0061] Figure 5A Is an external view schematic diagram of an electroacoustic transducer according to an embodiment of the present utility model.

[0062] Figure 5B Is Figure 5A A partial cross-sectional schematic diagram of the illustrated embodiment, showing the resonance cavity structure.

[0063] Figure 6 Is a schematic diagram showing the performance of the ratio of the chord center distance to the radius of the electroacoustic transducer of the present utility model in terms of sound pressure and frequency.

[0064] Figure 7 Is a schematic diagram showing the performance of the ratio of the opening area of the side sound-emitting holes to the central sound-transmitting port of the electroacoustic transducer of the present utility model in terms of sound pressure and frequency.

[0065] Figure 8A Is an external view schematic diagram of an electroacoustic transducer according to an embodiment of the present utility model.

[0066] Figure 8B is Figure 8A a schematic cross-sectional view of the illustrated embodiment.

[0067] Figure 9A is a schematic external view of an electro-acoustic transducer according to an embodiment of the present utility model.

[0068] Figure 9B is Figure 9A a partial cross-sectional view of the illustrated embodiment.

[0069] Figure 10A is a schematic cross-sectional view of a resonance plate of an electro-acoustic transducer according to an embodiment of the present utility model.

[0070] Figure 10B is a top view of an electro-acoustic transducer according to an embodiment of the present utility model.

[0071] Figures 10C to 10E are respectively schematic cross-sectional views of an electro-acoustic transducer according to an embodiment of the present utility model.

[0072] Figure 11 is a cross-sectional view of an electro-acoustic transducer according to an embodiment of the present utility model.

[0073] Figure 12 is a cross-sectional view of an electro-acoustic transducer according to an embodiment of the present utility model. Specific embodiments

[0074] Please refer to Figure 2 , which is a schematic external view of an electro-acoustic transducer Z1 according to an embodiment of the present utility model. The electro-acoustic transducer Z1 includes a hollow disk body 11, which is a disk-shaped main body with a hollow interior, and a resonance cavity C is formed at the hollow part. A geometric central axis L1 is defined in the central region of one plane of the hollow disk body 11. A side sound outlet hole 111 is provided on the side surface of the hollow disk body 11, and the side sound outlet hole 111 defines a lateral propagation axis L2 that is substantially orthogonal to the geometric central axis L1. The hole height H of the side sound outlet hole 111 is the same as a part of the thickness of the resonance cavity C. In other words, according to some embodiments, the hole height H of the side sound outlet hole 111 is the same as the thickness at any place of the resonance cavity C.

[0075] Please refer to Figure 3A and Figure 3B , Figure 3A which is a schematic external view of an electro-acoustic transducer Z2 according to an embodiment of the present utility model. Figure 3B is Figure 3APartial schematic diagram of the illustrated embodiment, showing the resonance cavity structure. In this embodiment, the hollow disk body 11 includes a pair of parallel plate-like members 113, 114. In other words, the two plate-like members are combined relative to each other to form the hollow disk body 11, and the hollow disk body 11 has a side sound outlet hole 111. In some embodiments, the plate-like members 113, 114 are made of ceramics.

[0076] Please refer to Figure 4A and Figure 4B , Figure 4A is a schematic view of the appearance of the electro-acoustic transducer Z3 according to an embodiment of the present invention. Figure 4B is Figure 4A Partial schematic diagram of the illustrated embodiment, showing the resonance cavity structure. In this embodiment, a central sound transmission port 112 is provided in the central region of the pair of plate-like members. The central sound transmission port 112 defines a path for entering and exiting the resonance cavity C inside the hollow disk body 11, and the path defines a forward propagation axis L3 that is substantially coaxial with the geometric central axis L1 of the hollow disk body 11. In other words, the lateral propagation axis L2 is perpendicular to the aforementioned path. In some embodiments, the aforementioned pair of plate-like members are, for example, a pair of resonance plates.

[0077] It should be particularly noted that the central sound transmission port 112 can be provided in one of the aforementioned pair of plate-like members (plate-like member 113 or plate-like member 114) and communicated with the resonance cavity C. In some embodiments, the central sound transmission ports 112 are respectively provided on the two plate-like members (that is, both the plate-like member 113 and the plate-like member 114 are provided with central sound transmission ports 112) (see the following description for details).

[0078] Please refer to Figures 5A to 7 , Figure 5A is a schematic view of the appearance of the electro-acoustic transducer Z4 according to an embodiment of the present invention. Figure 5B is Figure 5A Partial schematic diagram of the illustrated embodiment, showing the resonance cavity structure. Figure 6 is a schematic diagram showing the ratio of the chordal distance to the radius of the electro-acoustic transducer of the present invention in terms of the performance of sound pressure and frequency. Figure 7 is a schematic diagram showing the ratio of the opening area of the side sound outlet hole 111 to the central sound transmission port 112 of the electro-acoustic transducer of the present invention in terms of the performance of sound pressure and frequency.

[0079] In Figure 5A and Figure 5B In the illustrated embodiment, at least one of the aforementioned pair of plate-like members (plate-like member 113 or plate-like member 114) is an active sound generating member. According to some embodiments, the active sound generating member may include a piezoelectric member 1131 attached to the plate-like member 113. With Figure 5A and Figure 5BFor example, the electroacoustic transducer Z4 is shown as having a pair of active sound generating members (i.e., the plate-like member 113 and the plate-like member 114). One plate-like member 113 (resonance plate) of the active sound generating members serves as an acoustic resonance membrane, which can be driven by a corresponding piezoelectric member (piezoelectric member 1131) after a voltage is applied, thereby forming a unimorph structure for generating sound output. According to some embodiments, a piezoelectric member 1131 and 1141 can be respectively provided on the two plate-like members (see Figure 8B ). The piezoelectric members 1131 and 1141 are respectively provided on the surfaces of the plate-like member 113 and the plate-like member 114, thereby forming a bimorph structure to enhance the sound driving performance. The surface of the plate-like member can be the outer surface of the plate-like members 113 and 114, or the inner surface of the plate-like members 113 and 114. That is to say, when the piezoelectric member is provided on the inner surface of the plate-like member, the piezoelectric member is located in the resonance cavity C. The present invention does not limit the setting position of the piezoelectric member.

[0080] Take Figure 5A as an example. The outer diameter of the plate-like member 113 is larger than the outer diameter of the piezoelectric member 1131, and the piezoelectric member 1131 and the plate-like member 113 are coupled concentrically with each other. As Figure 5A shown, the piezoelectric member 1131 and the plate-like member 113 have a substantially circular planar profile. The side sound outlet hole 111 is opened on the chord corresponding to the central angle α of the circular planar profile of the corresponding plate-like member 113. In some embodiments, the range of the central angle α is from 12 degrees to 41 degrees.

[0081] According to some other embodiments, the planar profile of the resonance plate defines a radius D3 passing through the geometric central axis L1. The side sound outlet hole 111 is formed on the chord length D1 corresponding to the radius D3. That is to say, the side sound outlet hole 111 is opened on a chord length D1 of the substantially circular planar profile. The connection line between the chord length D1 where the side sound outlet hole 111 is located and the center of the circle is the chord center distance D2. The extending direction of the chord center distance D2 defines the lateral propagation axis. In other words, the extending direction of the chord center distance D2 is the same as the extending direction of the lateral propagation axis. The ratio range of the chord center distance D2 to the radius D3 is from 70% to 79.5%. As Figure 6 shown, in the high-frequency part, the ratio of the chord center distance D2 to the radius D3 has little influence on the sound pressure level. In the low-frequency and mid-frequency bands, the longer the chord center distance D2, the greater the output sound pressure. In the mid-low frequency, mid-high frequency and ultra-high frequency bands, the longer the chord center distance D2, the lower the sound pressure level. In some embodiments, the ratio range of the chord length D1 to the diameter is from 60% to 70%.

[0082] According to some other embodiments, the ratio range of the opening area of the side sound outlet hole 111 to the opening area of the central sound transmission port 112 is from 4.9% to 15.3%. As Figure 7As shown, as the ratio of the side sound-emitting holes 111 to the central sound-transmitting port 112 decreases, the structural resonance peak will shift towards higher frequencies. Therefore, overall, the high-frequency performance will be improved.

[0083] Please refer to Figure 8A and Figure 8B , Figure 8A which is a schematic external view of an electroacoustic transducer Z5 according to an embodiment of the present invention. Figure 8B is Figure 8A a schematic cross-sectional view of the illustrated embodiment. The electroacoustic transducer includes a circular hollow disk body 11, and a central sound-transmitting port 112 is formed in its central region. The illustrated hollow disk body 11 includes a pair of plate-like members 113, 114, which are arranged in parallel and kept separated from each other (for example, separated by an annular gasket 115, as described in detail below), thereby defining a resonance cavity C therebetween. Each of the plate-like members 113, 114 is provided with a central sound-transmitting port 112. Therefore, an annular opening through which the resonance cavity C can communicate is formed between the central sound-transmitting ports 112 of the pair of plate-like members 113, 114 respectively.

[0084] According to this embodiment, the electroacoustic transducer Z5 further includes a peripheral enclosure structure 115, which is joined to the outer edge portions of the pair of plate-like members 113, 114, thereby defining the resonance cavity C. The peripheral enclosure structure 115 is, for example, the aforementioned annular gasket.

[0085] According to this embodiment, each of the plate-like members 113, 114 has an active sound-generating member. For example, each of the plate-like members 113, 114 has a piezoelectric member 1131, 1141 (for example, a piezoelectric layer, which is arranged outside the resonance cavity C) attached thereto. One (or more) conductive wirings 116 passing through both the aforementioned piezoelectric members 1131, 1141 and the plate-like members 113, 114 are provided for transmitting electrical signals. The conductive wiring 116 may include a planar signal conduction structure that is beneficial for reducing the form factor and device reliability. For example, the conductive wiring 116 may be a conductive wiring pattern provided by a suitable method such as electroplating or physical vapor deposition (PVD) technology, or integrated on a flexible printed circuit (FPC) member.

[0086] In the current illustration, electrical contacts 117 are arranged between the conductive wiring 116 and the electroacoustic transducer Z5 components to achieve signal connection. A conductive layer 118 is provided on the flat surfaces of the piezoelectric members 1131, 1141. A protective layer 119, such as a passivation layer, may be further formed on the aforementioned conductive layer 118.

[0087] Please refer to Figure 9A and Figure 9B , Figure 9A which is a schematic external view of an electroacoustic transducer Z6 according to an embodiment of the present invention. Figure 9B isFigure 9A Partial cross-sectional schematic diagram of the illustrated embodiment, showing the structure of the resonance cavity C. In this embodiment, the plate-like members 113 and 114 are, for example, resonance plates. Both the piezoelectric member 1131 and the resonance plate have a rectangular planar profile, and the side sound outlet 111 is formed on the short side E1 of the rectangular planar profile of the resonance plate. According to some other embodiments, the side sound outlet 111 is formed on the long side E2 of the rectangular planar profile of the resonance plate.

[0088] It should be particularly noted that the resonance plate has a rectangular planar profile, and the central sound transmission port 112 can be formed on one of the resonance plates (the plate-like member 113 or the plate-like member 114), or both resonance plates are provided with the central sound transmission port 112. In some embodiments, neither of the two resonance plates is provided with the central sound transmission port 112. There are at least the following three ways of combining the two resonance plates: combining with the short side E3 without the side sound outlet 111 and the two long sides E2 and E4, combining with the two opposite short sides E1 and E3, and combining with the short side E3 without the side sound outlet 111. The present invention is not limited thereto. The piezoelectric member can be one (the piezoelectric member 1131) or two (the piezoelectric members 1131 and 1141), which are respectively located on the inner surface or the outer surface of the resonance plate. The piezoelectric member 1131 (the piezoelectric member 1141) may also have a central opening or no central opening. Thus, combining the above structural features, the rectangular electro-acoustic transducer has 54 combined states, and the present invention does not limit which kind of rectangular electro-acoustic transducer it is.

[0089] Please refer to Figures 10A to 10E , Figure 10A is a cross-sectional schematic diagram of a resonance plate of an electro-acoustic transducer according to an embodiment of the present invention. Figure 10B is a top view of an electro-acoustic transducer according to an embodiment of the present invention. Figures 10C to 10E are respectively cross-sectional schematic diagrams of electro-acoustic transducers Z7 to Z10 according to an embodiment of the present invention. According to Figure 10A the embodiment, the resonance plate includes a flat central well portion 113a, a base portion 113b disposed opposite to the central well portion, a ring-shaped lip portion 113c rising from the central well portion, and an edge portion 113d surrounding the periphery of the ring-shaped lip portion. Figures 10C to 10E respectively illustrate the states of combination of a resonance plate (including a flat central well portion 113a, a base portion 113b disposed opposite to the central well portion 113a, a ring-shaped lip portion 113c rising from the central well portion 113a, and an edge portion 113d surrounding the periphery of the ring-shaped lip portion) and another resonance plate. The other resonance plate can be a flat plate or also have a flat central well portion 114a, a base portion 114b disposed opposite to the central well portion 114a, a ring-shaped lip portion 114c rising from the central well portion 114a, and an edge portion 114d surrounding the periphery of the ring-shaped lip portion 114c. Figure 10C The illustrated embodiment andFigure 10E The difference between the illustrated embodiments lies in whether the piezoelectric member 1131 is disposed on a single resonance plate or two resonance plates are respectively provided with piezoelectric members 1131 and 1141.

[0090] It should be particularly noted that the aforementioned piezoelectric member (piezoelectric member 1131 or piezoelectric member 1141) can be a disk or an annulus. The shape of each resonance plate can be a disk or an annulus. For example, the hollow disk 11 includes two disk resonance plates, or includes two annular resonance plates, or includes a disk resonance plate and an annular resonance plate. Also, the piezoelectric member can be one or two, located on the inner surface or the outer surface of the resonance plate respectively. Thus, there are a total of 18 combinations of states for the electro-acoustic transducer.

[0091] Please refer to Figure 11 and Figure 12 , which are cross-sectional views of the electro-acoustic transducers 200 and 300 of an embodiment of the present invention respectively. According to Figure 11 the illustrated embodiment, the electro-acoustic transducer 200 further includes a hollow encapsulation body 21 for accommodating the hollow disk 11. The hollow encapsulation body 21 is configured to suspend the hollow disk 11 therein. The side surface of the hollow encapsulation body 21 has side sound-emitting holes 211 disposed in a direction substantially orthogonal to the forward propagation axis L3 of the hollow disk 11. The aforementioned suspension includes being configured and suspended within the hollow encapsulation body 21. The hollow disk 11 can be in contact or non-contact with the hollow encapsulation body 21. By reducing the contact with the hollow encapsulation body 21, the influence of the hollow encapsulation body 21 on the vibration and sound emission of the hollow disk 11 is reduced. The aforementioned hollow encapsulation body 21 can be the housing of a headphone or the housing of a speaker, and the present invention is not limited thereto. Also according to Figure 12 the illustrated embodiment, the difference from Figure 11 the illustrated embodiment is that the side surface of the hollow disk 11 is further provided with side sound-emitting holes 111, which define a lateral propagation axis L2 substantially orthogonal to the forward propagation axis L3.

[0092] According to an embodiment of the present invention, the hollow disk of the electro-acoustic transducer has side sound-emitting holes for lateral sound emission, and the lateral propagation axis of the side sound-emitting holes is orthogonal to the geometric central axis. With this structure, the available space inside the electro-acoustic transducer is increased, and multiple chips or / and large-sized batteries can be provided to meet the requirements of small size, multiple functions, and long battery life of the electro-acoustic transducer.

[0093] Also according to some embodiments of the present invention, the side surface of the hollow encapsulation body has side sound-emitting holes disposed in a direction substantially orthogonal to the forward propagation axis of the hollow disk. In some other embodiments, the side surface of the hollow disk is further provided with side sound-emitting holes, which define a lateral propagation axis substantially orthogonal to the forward propagation axis. These embodiments also have the aforementioned technical effects.

[0094] The content disclosed above is only the preferred and feasible embodiment of the utility model, and does not limit the protection scope of the claims of the utility model. Therefore, all equivalent technical changes made by using the content of the description and drawings of the utility model are included in the protection scope of the claims of the utility model.

Claims

1. An electroacoustic transducer, characterized in that: The electroacoustic transducer comprises: A hollow disc body, which is a disc-shaped body with a hollow interior, and a resonance cavity is formed at the hollow part; Wherein, a planar center area of ​​the hollow disk defines a geometric center axis; Wherein, a side sound outlet hole is provided on the side of the hollow disk, and the side sound outlet hole defines a lateral propagation axis substantially orthogonal to the geometric center axis; and Wherein, a hole height of the side sound outlet hole is the same as a thickness of at least a portion of the resonance cavity.

2. The electroacoustic transducer according to claim 1, characterized in that: The hollow disk body includes a pair of plate-shaped components arranged in parallel.

3. The electroacoustic transducer according to claim 2, characterized in that: A central sound transmission port is provided in a central region of at least one of the pair of plate-like components, wherein the central sound transmission port defines a path entering and exiting the resonance cavity in the hollow disk body, wherein the path defines a forward propagation axis that is substantially coaxial with the geometric center axis of the hollow disk body.

4. The electroacoustic transducer according to claim 2, characterized in that: At least one of the pair of plate-shaped components is an active sound-generating component.

5. The electroacoustic transducer according to claim 4, characterized in that: The active sound generating member includes a resonance plate and a piezoelectric member attached to the resonance plate.

6. The electroacoustic transducer according to claim 5, characterized in that: The piezoelectric member is located in the resonance cavity.

7. The electroacoustic transducer according to claim 5, characterized in that: The resonance plate has an outer diameter greater than an outer diameter of the piezoelectric member, wherein the piezoelectric member and the resonance plate are concentrically coupled to each other.

8. The electroacoustic transducer according to claim 7, characterized in that: The piezoelectric component and the resonance plate both have a rectangular plane profile, wherein the side-outlet sound-speaker hole is opened at a short side of the rectangular plane profile of the resonance plate.

9. The electroacoustic transducer according to claim 7, characterized in that: The piezoelectric member and the resonant plate have a substantially circular planar profile; The side sound-emitting hole is arranged on a chord corresponding to a central angle of a circular plane contour of the resonance plate; and The center angle ranges from 12 degrees to 41 degrees.

10. The electroacoustic transducer according to claim 7, characterized in that: The planar profile of the resonant plate defines a radius passing through the geometric central axis; Wherein, the side-outlet sound-speaker hole is formed on a chord length corresponding to the radius, and the chord-center distance corresponding to the chord length defines the lateral propagation axis; The ratio of the chord-center distance to the radius ranges from 70% to 79.5%.

11. The electroacoustic transducer according to claim 3, characterized in that: The ratio of an opening area of ​​the side sound outlet to that of the central sound outlet is in a range of 4.9% to 15.3%.

12. The electroacoustic transducer according to claim 3, characterized in that: The central sound-transmitting ports are respectively opened in the central areas of the pair of plate-like components, wherein an annular opening is formed between the two central sound-transmitting ports, and the annular opening defines a path in and out of the resonance cavity in the hollow disk body.

13. The electroacoustic transducer according to claim 5, characterized in that: The electroacoustic transducer further comprises a peripheral enclosure structure joined to the outer edge portions of the two resonance plates, thereby defining the resonance cavity located between the pair of plate-like components.

14. The electroacoustic transducer according to claim 13, characterized in that: The resonance plate includes a flat central well portion, a base portion disposed opposite to the central well portion, an annular lip portion raised from the central well portion, and an edge portion surrounding the periphery of the annular lip portion.

15. The electroacoustic transducer according to claim 13, characterized in that: The electroacoustic transducer further comprises an annular gasket arranged between the pair of plate-like members, the annular gaskets jointly forming the resonance cavity, wherein an outer surface of the annular gasket at least partially forms the peripheral enclosure structure of the hollow disk.

16. The electroacoustic transducer according to claim 1, characterized in that: The electroacoustic transducer also includes a hollow packaging body for accommodating the hollow disk, wherein the hollow packaging body is configured to suspend the hollow disk therein, wherein a side sound outlet hole is opened on the side surface of the hollow packaging body in the same direction as the lateral propagation axis of the hollow disk.

17. An electroacoustic transducer, characterized in that: The electroacoustic transducer comprises: A hollow disc body, which is a disc-shaped body with a hollow interior, forming a resonance cavity at a hollow portion, wherein at least one central sound transmission port is opened in the central area of ​​the disc-shaped body; Wherein, the central sound-transmitting port defines a path in and out of the resonance cavity in the hollow disk body; wherein the path defines a forward propagation axis substantially orthogonal to the hollow disk; and Wherein, a side sound outlet hole is further provided on the side surface of the hollow disk, and the side sound outlet hole defines a side propagation axis which is substantially orthogonal to the forward propagation axis.

18. The electroacoustic transducer according to claim 17, characterized in that: The hole height of the side-outlet sound-emitting hole is the same as the thickness of at least a portion of the resonance cavity.

19. The electroacoustic transducer according to claim 17, characterized in that: The hollow disk body includes a pair of plate-shaped components arranged in parallel.

20. The electroacoustic transducer according to claim 19, characterized in that: At least one of the pair of plate-shaped components is an active sound-generating component.

21. The electroacoustic transducer according to claim 20, characterized in that: The active sound generating member includes a resonance plate and a piezoelectric member attached to the resonance plate.

22. The electroacoustic transducer according to claim 21, characterized in that: The piezoelectric member is located in the resonance cavity.

23. The electroacoustic transducer according to claim 21, characterized in that: The resonance plate has an outer diameter greater than an outer diameter of the piezoelectric member, wherein the piezoelectric member and the resonance plate are concentrically coupled to each other.

24. The electroacoustic transducer according to claim 23, characterized in that: The piezoelectric component and the resonance plate both have a rectangular plane profile, wherein the side-outlet sound-speaker hole is opened at a short side of the rectangular plane profile of the resonance plate.

25. The electroacoustic transducer according to claim 23, characterized in that: The piezoelectric member and the resonant plate have a substantially circular planar profile; The side sound-emitting hole is arranged on a chord corresponding to a central angle of a circular plane contour of the resonance plate; and The center angle ranges from 12 degrees to 41 degrees.

26. The electroacoustic transducer according to claim 23, characterized in that: The planar profile of the resonant plate defines a radius passing through the geometric central axis; Wherein, the side-outlet sound-speaker hole is formed on a chord length corresponding to the radius, and the chord-center distance corresponding to the chord length defines the lateral propagation axis; The ratio of the chord-center distance to the radius ranges from 70% to 79.5%.

27. The electroacoustic transducer according to claim 17, characterized in that: The ratio of an opening area of ​​the side sound outlet to that of the central sound outlet is in a range of 4.9% to 15.3%.

28. The electroacoustic transducer according to claim 19, characterized in that: The central sound-transmitting ports are respectively opened in a central area of ​​each of the pair of plate-like components, wherein an annular opening is formed between the two central sound-transmitting ports, and the annular opening defines a path in and out of the resonance cavity in the hollow disk body.

29. The electroacoustic transducer according to claim 21, characterized in that: The electroacoustic transducer further comprises a peripheral enclosure structure joined to the outer edge portions of the two resonance plates, thereby defining the resonance cavity located between the pair of plate-like components.

30. The electroacoustic transducer according to claim 29, characterized in that: The resonance plate includes a flat central well portion, a base portion disposed opposite to the central well portion, an annular lip portion raised from the central well portion, and an edge portion surrounding the periphery of the annular lip portion.

31. The electroacoustic transducer according to claim 29, characterized in that: The electroacoustic transducer further comprises an annular gasket arranged between the pair of plate-like members, the annular gaskets jointly forming the resonance cavity, wherein an outer surface of the annular gasket at least partially forms the peripheral enclosure structure of the hollow disk.

32. The electroacoustic transducer according to claim 17, characterized in that: The electroacoustic transducer also includes a hollow packaging body for accommodating the hollow disk, wherein the hollow packaging body is configured to suspend the hollow disk therein, wherein a side sound outlet hole is opened on the side surface of the hollow packaging body in the same direction as the lateral propagation axis of the hollow disk.

33. An electroacoustic transducer, characterized in that: The electroacoustic transducer comprises: A hollow disc body, which is a disc-shaped body with a hollow interior, forming a resonance cavity at a hollow portion; Wherein, at least one central sound transmission port is provided in the central area of ​​the disc-shaped body; wherein the central sound-transmitting port defines a path in and out of the resonance cavity in the hollow disk; and wherein the path defines a forward propagation axis substantially orthogonal to the hollow disk; Wherein, a side sound outlet hole is further provided on the side of the hollow disk, and the side sound outlet hole defines a side propagation axis substantially orthogonal to the forward propagation axis; and A hollow packaging body is configured to substantially suspend the hollow disk body therein, and the side surface of the hollow packaging body has a sound outlet hole arranged in a direction substantially orthogonal to the forward propagation axis of the hollow disk body.

34. The electroacoustic transducer according to claim 33, characterized in that: The hole height of the side-outlet sound-emitting hole is the same as the thickness of at least a portion of the resonance cavity.

35. The electroacoustic transducer according to claim 33, characterized in that: The hollow disk body includes a pair of plate-shaped components arranged in parallel.

36. The electroacoustic transducer according to claim 35, characterized in that: At least one of the pair of plate-shaped components is an active sound-generating component.

37. The electroacoustic transducer according to claim 36, characterized in that: The active sound generating member includes a resonance plate and a piezoelectric member attached to the resonance plate.

38. The electroacoustic transducer according to claim 37, characterized in that: The piezoelectric member is located in the resonance cavity.

39. The electroacoustic transducer according to claim 37, characterized in that: The resonance plate has an outer diameter greater than an outer diameter of the piezoelectric member, wherein the piezoelectric member and the resonance plate are concentrically coupled to each other.

40. The electroacoustic transducer according to claim 39, characterized in that: The piezoelectric component and the resonance plate both have a rectangular plane profile, wherein the side-outlet sound-speaker hole is opened at a short side of the rectangular plane profile of the resonance plate.

41. The electroacoustic transducer according to claim 39, characterized in that: The piezoelectric member and the resonant plate have a substantially circular planar profile; The side sound-emitting hole is arranged on a chord corresponding to a central angle of a circular plane contour of the resonance plate; and The center angle ranges from 12 degrees to 41 degrees.

42. The electroacoustic transducer according to claim 39, characterized in that: The planar profile of the resonant plate defines a radius passing through the geometric central axis; Wherein, the side-outlet sound-speaker hole is formed on a chord length corresponding to the radius, and the chord-center distance corresponding to the chord length defines a lateral propagation axis; The ratio of the chord-center distance to the radius ranges from 70% to 79.5%.

43. The electroacoustic transducer according to claim 33, characterized in that: The ratio of an opening area of ​​the side sound outlet to that of the central sound outlet is in a range of 4.9% to 15.3%.

44. The electroacoustic transducer according to claim 35, characterized in that: The central sound-transmitting ports are respectively opened in a central area of ​​each of the pair of plate-like components, wherein an annular opening is formed between the two central sound-transmitting ports, and the annular opening defines a path in and out of the resonance cavity in the hollow disk body.

45. The electroacoustic transducer according to claim 37, characterized in that: The electroacoustic transducer further comprises a peripheral enclosure structure joined to the outer edge portions of the two resonance plates, thereby defining the resonance cavity located between the pair of plate-like components.

46. ​​The electroacoustic transducer according to claim 45, characterized in that The resonance plate includes a flat central well portion, a base portion disposed opposite to the central well portion, an annular lip portion raised from the central well portion, and an edge portion surrounding the periphery of the annular lip portion.

47. The electroacoustic transducer according to claim 45, characterized in that The electroacoustic transducer further comprises an annular gasket arranged between the pair of plate-like members, the annular gaskets jointly forming the resonance cavity, wherein an outer surface of the annular gasket at least partially forms the peripheral enclosure structure of the hollow disk.

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