Speaker

Abstract

The present invention provides a speaker, comprising a box body, a speaker and a thermal sound generating film. An installation cavity is formed in the box body, and the box body is provided with a first sound outlet hole communicating the installation cavity with the outside; the speaker is arranged in the installation cavity to radiate sound outward through the first sound outlet hole; the thermal sound generating film is arranged on the box body. The technical solution of this application can improve the sound frequency response characteristics of the speaker.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent audio devices, and particularly relates to a speaker. Background Art

[0002] With the development of technology, portable intelligent speakers have gradually gained popularity among people. However, due to the small size of portable speakers, the types and sizes of the speakers installed therein are limited, and generally they can only emit sounds in the mid-low audio frequency range. The sound frequency response characteristics of the speakers are poor and cannot meet the needs of users. Summary of the Invention

[0003] The main object of the present invention is to provide a speaker, aiming to improve the sound frequency response characteristics of the speaker.

[0004] To achieve the above object, a speaker proposed by the present invention includes:

[0005] A box body, an installation cavity is formed in the box body, and a first sound outlet hole communicating the installation cavity and the outside is opened on the box body;

[0006] A speaker, the speaker is arranged in the installation cavity to radiate sound outward through the first sound outlet hole; and

[0007] A thermal sound generating film, the thermal sound generating film is arranged on the box body.

[0008] In an embodiment of the speaker of the present invention, a second sound outlet hole communicating the installation cavity and the outside is opened on the side wall of the box body, and the thermal sound generating film is attached to the side wall of the installation cavity and is arranged opposite to the second sound outlet hole.

[0009] In an embodiment of the speaker of the present invention, the box body includes:

[0010] An outer shell, the installation cavity is formed inside the outer shell, and the first sound outlet hole and the second sound outlet hole are opened on the side wall of the outer shell; and

[0011] An inner shell, the inner shell is arranged in the installation cavity, the thermal sound generating film is clamped between the outer side wall of the inner shell and the inner side wall of the outer shell, and the bottom wall of the inner shell is spaced from the bottom wall of the outer shell to form a sound projection cavity below the inner shell, and the first sound outlet hole communicates with the sound projection cavity;

[0012] A receiving cavity is formed inside the inner shell, an installation hole communicating the receiving cavity and the sound projection cavity is opened on the bottom wall of the inner shell, the speaker is installed in the installation hole and the sound projection end of the speaker faces the sound projection cavity.

[0013] In an embodiment of the speaker of the present invention, the housing includes a cylinder, a top cover, and a bottom cover. The top cover and the bottom cover respectively cover the two open ends of the cylinder to enclose and form the installation cavity. The bottom cover includes a bottom plate and a surrounding edge. The surrounding edge is arranged around the circumference of the bottom plate, and the first sound outlet hole is provided on the surrounding edge.

[0014] In an embodiment of the speaker of the present invention, the top wall of the inner housing is spaced from the top cover to enclose and form a receiving cavity. The electronic control component of the speaker is installed in the receiving cavity, and the thermal sound generating film and the speaker are respectively electrically connected to the electronic control component.

[0015] In an embodiment of the speaker of the present invention, a limiting groove is provided on the inner side wall of the housing, and the second sound outlet hole is provided on the bottom wall of the limiting groove. The thermal sound generating film is limited in the limiting groove.

[0016] In an embodiment of the speaker of the present invention, a vibration groove is provided on the inner side wall of the housing. The thermal sound generating film covers the opening of the vibration groove and is spaced from the bottom wall of the vibration groove. The second sound outlet hole is provided on the bottom wall of the vibration groove.

[0017] In an embodiment of the speaker of the present invention, the aperture range of the second sound outlet hole is 0.6 mm to 2 mm;

[0018] And / or, the thermal sound generating film is arranged around the circumference of the box body. A plurality of the second sound outlet holes are provided on the box body. The plurality of second sound outlet holes are spaced at intervals along the circumference of the box body and are all arranged opposite to the thermal sound generating film.

[0019] In an embodiment of the speaker of the present invention, the sound frequency f emitted by the thermal sound generating film satisfies 0 < f ≤ 40 kHz.

[0020] In an embodiment of the speaker of the present invention, the thickness d of the thermal sound generating film satisfies d ≤ 1 mm.

[0021] In the technical solution of the present invention, by providing a thermal sound generating film and a speaker in the speaker, the speaker can emit sounds in the middle and low frequency bands. When the thermal sound generating film generates heat, it can heat the air around the thermal sound generating film, causing the air to vibrate and generate sound. The sound frequency band it emits can reach the high frequency band, so that the speaker has good sound frequency response characteristics and can emit sounds in the middle, low, and high frequency bands, improving the user experience. Moreover, the thermal sound generating film only needs to be attached to any structural surface in the installation cavity, without occupying too much space, and can avoid increasing the volume of the speaker. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on the structures shown in these drawings.

[0023] Figure 1 Structural diagram of a speaker according to an embodiment of the present invention;

[0024] Figure 2 For Figure 1 Exploded view of the speaker in

[0025] Figure 3 For Figure 1 Cross-sectional view of the speaker in

[0026] Figure 4 For Figure 3 Enlarged view of part A in

[0027] Figure 5 For Figure 1 Cross-sectional view of the speaker from another perspective in

[0028] Figure 6 For Figure 5 Enlarged view of part B in

[0029] Figure 7 For Figure 2 Cross-sectional view of the cylinder in

[0030] Figure 8 For Figure 2 Structural diagram of the upper housing in

[0031] Explanation of the reference numerals in the drawings:

[0032]

[0033]

[0034] The realization of the objectives, functional features, and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0036] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.

[0037] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0039] The present invention provides a speaker 100.

[0040] With reference to Figures 1 to 6 , in some embodiments of the speaker 100 of the present invention, the speaker 100 includes:

[0041] A cabinet 10, an installation cavity 111 is formed inside the cabinet 10, and a first sound outlet hole 115 communicating the installation cavity 111 with the outside is opened on the cabinet 10;

[0042] A speaker 20, the speaker 20 is arranged in the installation cavity 111 to radiate sound outward through the first sound outlet hole 115; and

[0043] A thermal sound generating film 30, the thermal sound generating film 30 is arranged on the cabinet 10.

[0044] In this embodiment, the speaker 100 includes a cabinet 10 as an installation base. An installation cavity 111 is formed inside the cabinet 10 for installing components such as a speaker 20 and a circuit board 41. Commonly, a first sound outlet hole 115 is formed on the cabinet 10. The first sound outlet hole 115 is used to communicate the outside with the installation cavity 111 to radiate the sound generated when the speaker 20 works to the outside. For the portable smart speaker 100, since the cabinet 10 of the speaker 100 is relatively small, the model and size of the speaker 20 installed therein are limited, and generally only medium and low frequency sounds can be emitted. The sound frequency response characteristic of the speaker 100 is poor and cannot meet the user's needs. However, for the speaker 100 proposed in this application, a thermal sound membrane 30 is further provided. Its sound generation principle is to apply electricity to the thermal sound membrane 30 to make the thermal sound membrane 30 generate heat, so as to heat the air around the thermal sound membrane 30 and make the air vibrate to generate sound. The sound frequency that the thermal sound membrane 30 can emit can reach the frequency range of high notes. Only by controlling the current or voltage value supplied to the thermal sound membrane 30 to make it reach different temperatures to heat the surrounding air, the air can vibrate at different frequencies to emit different frequency sounds. And by generating sound through the thermoacoustic effect, the heat of each position of the thermal sound membrane 30 is uniform, and the air vibration frequency on the periphery of the thermal sound membrane 30 is consistent, so that the speaker 100 has a better sound effect.

[0045] The thermal sound membrane 30 can be attached to any structural surface of the cabinet 10, including but not limited to the outer wall of the cabinet 10, the cavity wall of the installation cavity 111, or the structural surface of any component in the installation cavity 111. It can be understood that only attaching the thermal sound membrane 30 to the surface of the cabinet 10 or the component will not occupy too much additional space, and thus will not cause the volume of the speaker 100 to increase due to the setting of the thermal sound membrane 30. The shape of the thermal sound membrane 30 can be determined according to the shape of the structural surface to which it is attached. At the same time, the thermal sound membrane 30 does not vibrate itself during the working process, and only relies on the thermoacoustic effect to drive the surrounding air to vibrate, which can avoid the occurrence of resonance phenomenon, thus avoiding affecting the sound generation effect of the speaker 100 and also avoiding the vibration of the structure to which the thermal sound membrane 30 is attached. When powered on, the thermal sound membrane 30 generates heat evenly as a whole to heat the surrounding air to make the air vibrate and generate sound. It can be understood that the heat generation of all regions of the thermal sound membrane 30 is the same, driving the air to vibrate to generate the same sound pressure amplitude and the same phase. In addition, the heat transfer of the thermal sound membrane 30 to the medium occurs simultaneously on both the front and back sides of the film, and the generated sound waves are also the same on both sides. Only by passing different electrical signals into the thermal sound membrane 30 to make it generate heat at different temperatures can the air vibrate to generate audio within the entire audible range, and the thermal sound membrane 30 has the characteristics of being light, malleable, flexible, transparent, etc.

[0046] It should also be noted that the thermoacoustic membrane 30 can be a carbon nanotube membrane, in which the carbon nanotubes are preferentially oriented in the same direction. Of course, the thermoacoustic membrane 30 can also include multiple layers of carbon nanotube membranes, and the arrangement directions of the carbon nanotubes in adjacent carbon nanotube membranes form an included angle β, where 0° ≤ β ≤ 90°, and adjacent two layers of carbon nanotube membranes are tightly bonded by van der Waals forces. When the thermoacoustic membrane 30 includes a single-layer carbon nanotube membrane, it has good light transmittance, and its light transmittance is 67% - 95%. When the thermoacoustic membrane 30 includes multiple layers of carbon nanotube membranes, it has good mechanical strength and toughness. The thermoacoustic membrane 30 is not limited to the carbon nanotube membrane, and it can also be other thin films that can generate sound using the thermoacoustic principle, such as graphene membranes, etc.

[0047] Therefore, it can be understood that in the technical solution of the present invention, by arranging the thermoacoustic membrane 30 and the speaker 20 in the speaker 100, the speaker 20 can emit sounds in the mid-low frequency band. When the thermoacoustic membrane 30 generates heat, it can heat the air around the thermoacoustic membrane 30, causing the air to vibrate and generate sound, and the sound frequency band it emits can reach the high frequency band. Thus, the speaker 100 has good sound frequency response characteristics and can emit sounds in the mid, low, and high frequency bands, improving the user experience. Moreover, the thermoacoustic membrane 30 only needs to be attached to any structural surface in the installation cavity 111, which can avoid increasing the volume of the speaker 100.

[0048] In some embodiments, the electronic control component 40 includes a circuit board 41 and a battery 42. Both the circuit board 41 and the thermoacoustic membrane 30 are electrically connected to the battery 42, which can be connected by connectors such as wires or flexible circuit boards, or can also be connected by contacts or probes when in contact. At this time, the circuit board 41 controls the electric energy intensity output by the battery 42 to the thermoacoustic membrane 30 according to the acquired information, thereby controlling the heat generation amount of the thermoacoustic membrane 30 and controlling the sound frequency of the air vibration to generate sound. As shown in the embodiments below, the battery 42 and the thermoacoustic membrane 30 are located in different spaces, and a second wire passing hole 125 can be opened between the battery 42 and the thermoacoustic membrane 30 for passing through connectors such as wires or flexible circuit boards to connect the battery 42 and the thermoacoustic membrane 30.

[0049] It can be understood that two electrodes are provided on the thermoacoustic membrane 30, and both electrodes are connected to the electronic control component 40 to form a circuit. Preferably, the two electrodes are located at two ends of the thermoacoustic membrane 30 that are far away from each other, so that the current can flow to all positions of the thermoacoustic membrane 30, so that the heat generation of all regions of the thermoacoustic membrane 30 is the same, and the sound pressure amplitudes and phases generated by driving the air vibration are the same. In some embodiments, the thermoacoustic membrane 30 is arranged in a ring shape. At this time, the two electrodes can be located at both ends of the diameter of the ring structure respectively.

[0050] In some embodiments, two metal contacts 31 are provided on the thermoacoustic film 30 to form two electrodes of the thermoacoustic film 30, which are respectively electrically connected to the electronic control component 40 of the speaker 100. The electronic control component 40 receives an external signal to provide an electrical signal to the thermoacoustic film 30 through the metal contacts 31. The setting of the metal contacts 31 can reduce the resistance of the thermoacoustic film 30, reduce the electrical energy provided to the thermoacoustic film 30, and thus reduce energy consumption.

[0051] Further, in some embodiments, a plurality of first sound outlet holes 115 are provided, and the plurality of first sound outlet holes 115 are arranged at intervals along the circumferential direction of the speaker 100 on the surrounding edge 1142.

[0052] In this embodiment, the setting of the plurality of first sound outlet holes 115 can cause the sound emitted by the speaker 20 to radiate in all directions, so that the user can hear the sound with better sound effects no matter which direction of the speaker 100.

[0053] Please refer to Figures 3 to 6 , in some embodiments of the speaker 100 of the present invention, a second sound outlet hole 116 communicating the installation cavity 111 and the outside is provided on the side wall of the box body 10, and the thermoacoustic film 30 is attached to the side wall of the installation cavity 111 and is disposed opposite to the second sound outlet hole 116.

[0054] In this embodiment, the thermoacoustic film 30 is attached to the inner side wall of the installation cavity 111, a second sound outlet hole 116 communicating the outside and the installation cavity 111 is provided on the side wall of the box body 10, and the second sound outlet hole 116 is disposed opposite to the thermoacoustic film 30. It can be understood that since the sound generation principle of the thermoacoustic film 30 is the conversion of "electricity-thermal-sound", the thermoacoustic film 30 will emit a certain amount of heat while generating sound. In this embodiment, the second sound outlet hole 116 is disposed opposite to the thermoacoustic film 30, which can directly transmit the sound generated by the vibration of the air around the thermoacoustic film 30 to the outside, and is also beneficial to enhancing the heat dissipation effect, so that the thermoacoustic film 30 can quickly dissipate heat after receiving the electrical signal to heat and cause the surrounding air to vibrate and generate sound, so as to generate heat corresponding to the electrical signal according to the subsequent received electrical signal, so that it can quickly respond to the changing electrical signal, cause the surrounding air to vibrate at the corresponding frequency and generate sound, and avoid the influence of the heat generated earlier on the subsequent sound generation due to untimely heat dissipation.

[0055] Please refer to Figure 1 and Figure 2 , in an embodiment of the speaker 100 of the present invention, a plurality of second sound outlet holes 116 are provided, and the plurality of second sound outlet holes 116 are arranged in an array on the side wall of the box body 10 and are all disposed opposite to the thermoacoustic film 30.

[0056] It can be understood that the thermoacoustic membrane 30 utilizes the thermoacoustic conversion principle. By applying an electrical signal to the thermoacoustic membrane 30, the thermoacoustic membrane 30 generates heat to heat the air around the thermoacoustic membrane 30, causing the air to vibrate and produce sound. When the thermoacoustic membrane 30 generates heat, the entire thermoacoustic membrane 30 generates heat to cause the air in the entire area of the thermoacoustic membrane 30 to vibrate and produce sound. The setting of multiple second sound outlets 116 can enable the sound generated by the thermoacoustic membrane 30 to be evenly transmitted outward, and can improve the heat dissipation efficiency of the thermoacoustic membrane 30, so that the thermoacoustic membrane 30 can dissipate heat in a timely manner and quickly respond to changes in the electrical signal.

[0057] Please refer to Figure 2 and Figure 3 In some embodiments of the speaker 100 of the present invention, the cabinet 10 includes:

[0058] A housing 11, an installation cavity 111 is formed inside the housing 11, and a first sound outlet 115 and a second sound outlet 116 are formed on the side wall of the housing 11; and

[0059] An inner housing 12, the inner housing 12 is arranged in the installation cavity 111, the thermoacoustic membrane 30 is clamped between the outer side wall of the inner housing 12 and the inner side wall of the housing 11, and the bottom wall of the inner housing 12 is spaced from the bottom wall of the housing 11 to form a sound cavity 13 below the inner housing 12, and the first sound outlet 115 communicates with the sound cavity 13;

[0060] A receiving cavity 121 is formed inside the inner housing 12, and an installation hole 122 communicating the receiving cavity 121 and the sound cavity 13 is formed on the bottom wall of the inner housing 12. The speaker 20 is installed in the installation hole 122 and the sound emitting end of the speaker 20 faces the sound cavity 13.

[0061] In this embodiment, the cabinet 10 includes an inner housing 12 and a housing 11. An installation cavity 111 is formed inside the housing 11. The inner housing 12 is installed in the installation cavity 111. The housing 11 is provided with the aforementioned second sound outlet 116. The thermoacoustic membrane 30 is clamped between the housing 11 and the inner housing 12 and covers the second sound outlet 116. With such a setting, the thermoacoustic membrane 30 is clamped by the housing 11 and the inner housing 12 to further fix the thermoacoustic membrane 30 and prevent the thermoacoustic membrane 30 from vibrating, resulting in a resonance effect.

[0062] Furthermore, a receiving cavity 121 is formed in the inner shell 12, and the bottom wall of the inner shell 12 is spaced from the bottom wall of the outer shell 11 to form a sound cavity 13. The speaker 20 is installed in the mounting hole 122 on the bottom wall of the inner shell 12 with the sound-emitting end facing the sound cavity 13, so that the sound emitted by the speaker 20 is radiated outward through the sound cavity 13 and the first sound outlet hole 115 of the outer shell 11. With this arrangement, the thermal sound-generating film 30 and the speaker 20 are accommodated in different spaces, which can avoid the mutual influence when the speaker 20 and the thermal sound-generating film 30 generate sound. It can be understood that in a traditional speaker 100, when the speaker 20 is powered on to make the diaphragm vibrate and generate sound, the pressure in the inner cavity of the speaker 100 will change with the vibration of the diaphragm. If the thermal sound-generating film 30 and the speaker 20 are housed in the same space, it is easy to cause the thermal sound-generating film 30 to vibrate due to the change in the pressure in the inner cavity of the speaker 100, affecting the sound-generating effect of the thermal sound-generating film 30. And the speaker 20 is installed at the mounting hole 122 on the bottom wall of the receiving cavity 121, so that a closed space is formed in the receiving cavity 121 as the rear cavity of the speaker 20, forming an effect similar to that of a closed speaker 100. When the speaker 20 is powered on to make the diaphragm vibrate and generate sound, the pressure change in the receiving cavity 121 can drive the vibration to quickly reset to respond to the continuously changing electrical signal. For example, when the diaphragm moves towards the receiving cavity 121, the pressure in the receiving cavity 121 increases, thereby generating a repulsive force on the diaphragm, driving the diaphragm to quickly reset to respond to the subsequent electrical signal and vibrate according to the subsequent electrical signal, improving the instantaneous characteristics of the speaker 20.

[0063] Please refer to Figure 2 In an embodiment of the speaker 100 of the present invention, the outer shell 11 includes a cylindrical body 112, a top cover 113 and a bottom cover 114. The top cover 113 and the bottom cover 114 respectively cover the two open ends of the cylindrical body 112 to enclose and form the mounting cavity 111. The bottom cover 114 includes a bottom plate 1141 and a surrounding edge 1142. The surrounding edge 1142 is arranged around the circumference of the bottom plate 1141, and the first sound outlet hole 115 is formed in the surrounding edge 1142.

[0064] In this embodiment, the aforementioned sound cavity 13 is formed between the bottom cover 114 of the outer shell 11 and the bottom wall of the inner shell 12. The speaker 20 is installed at the mounting hole 122 on the bottom wall of the inner shell 12, and the sound-emitting end of the speaker 20 faces the sound cavity 13. At the same time, the first sound outlet hole 115 communicating the sound cavity 13 and the outside is formed in the surrounding edge 1142 of the bottom cover 114 of the outer shell 11. With this arrangement, the sound-emitting positions of the speaker 20 and the thermal sound-generating film 30 are different, which can avoid the interference between the sound generated by the speaker 20 and the sound generated by the thermal sound-generating film 30. And the first sound outlet hole 115 is arranged on the surrounding edge 1142 of the bottom cover 114, which also avoids the first sound outlet hole 115 being directly formed on the bottom wall of the box body 10, resulting in the first sound outlet hole 115 being blocked when the speaker 100 is placed, affecting the sound-emitting effect of the speaker 20.

[0065] Please refer to Figure 3 and Figure 5 In an embodiment of the speaker 100 of the present invention, the top wall of the inner shell 12 is spaced from the top cover 113 to enclose a receiving cavity 14. The electronic control component 40 of the speaker 100 is installed in the receiving cavity 14. The thermal sound generating film 30 and the speaker 20 are respectively electrically connected to the electronic control component 40 through wires passing through the cavity wall of the receiving cavity 14.

[0066] In this embodiment, the top wall of the inner shell 12 is spaced from the top cover 113 to form a receiving cavity 14 for installing devices such as the electronic control component 40 and the circuit board 41 of the speaker 100. Both the thermal sound generating film 30 and the speaker 20 are electrically connected to the electronic control component 40 through wires to receive electrical signals and emit sounds of corresponding frequencies. The electronic control component 40 includes a battery 42 and a circuit board 41. The battery 42 and the circuit board 41 are electrically connected. Both the thermal sound generating film 30 and the speaker 20 are electrically connected to the circuit board 41 to receive electrical signals through the circuit board 41 and emit sounds of corresponding audio frequencies according to the received electrical signals.

[0067] Please refer to Figure 1 and Figure 2 In some embodiments, a key 60 is provided on the top cover 113 of the outer shell 11. The key 60 is electrically connected to the electronic control component 40. The user can control the speaker 100 through the key 60 to select the working state of the speaker 100, such as controlling the volume, switching audio, or pausing playback, etc.

[0068] Please refer to Figure 5 In some embodiments of the speaker 100 of the present invention, the top wall of the inner shell 12 is recessed into the accommodating cavity 121 to form a mounting groove 123. The battery 42 is limited in the mounting groove 123. A first wire passing hole 124 communicating with the accommodating cavity 121 is formed in the bottom wall of the mounting groove 123 for passing the wire between the battery 42 and the speaker 20.

[0069] One of the side walls of the mounting groove 123 forms a part of the side wall of the inner shell 12 and is provided with a second wire passing hole 125 communicating with the mounting cavity 111 for passing the wire between the battery 42 and the thermal sound generating film 30.

[0070] With such a setting, the battery 42 is limited by the installation groove 123, improving the position stability of the battery 42 installed in the box body 10. Further, a first wire passing hole 124 communicating with the accommodation cavity 121 is formed in the bottom wall of the installation groove 123 for passing a wire to connect the speaker 20 and the circuit board 41. The battery 42 covers the first wire passing hole 124 to keep the accommodation cavity 121 closed, so that the speaker 20 has better transient characteristics. In some embodiments, one side wall of the installation groove 123 forms the side wall of the inner shell 12, and a second wire passing hole 125 communicating with the installation cavity 111 is formed in this side wall for passing a wire to connect the thermal sounding film 30 and the battery 42. Further, in some embodiments, the side wall provided with the second wire passing hole 125 and the inner side wall of the outer shell 11 are spaced apart to form an avoidance space for passing a wire, avoiding the wire being squeezed and damaged, and improving the installation convenience.

[0071] Please refer to Figure 1 and Figure 2 , in some embodiments, the speaker 100 further includes a power button 50. The power button 50 passes through the side wall of the outer shell 11 and is electrically connected to the circuit board 41. At this time, the top wall of the inner shell 12 partially covers the accommodation cavity 121 and partially covers the upper part of the avoidance space. A third wire passing hole 126 is formed in the top wall located above the avoidance space for passing a wire between the power button 50 and the circuit board 41.

[0072] Please refer to Figure 2 , in some embodiments of the speaker 100 of the present invention, the inner shell 12 includes an upper shell 127 and a lower shell 128 arranged in sequence along the height direction of the speaker 100. The upper shell 127 and the lower shell 128 are covered with each other to form the accommodation cavity 121.

[0073] In this embodiment, the inner shell 12 is set in the combined form of the upper shell 127 and the lower shell 128, which is convenient for the disassembly and assembly of devices such as the speaker 20 and the electronic control component 40 in the accommodation cavity 121. Further, in some embodiments, a limiting step is provided on the side wall of the opening of the upper shell 127 facing the lower shell 128, and the lower shell 128 is inserted into the upper shell 127 and abuts against the limiting step to improve the connection stability between the upper shell 127 and the lower shell 128.

[0074] Combined with reference to Figure 4 and Figure 7 , in some embodiments of the speaker 100 of the present invention, a limiting groove 117 is formed in the inner side wall of the outer shell 11, and the second sound outlet hole 116 is formed in the bottom wall of the limiting groove 117. The thermal sounding film 30 is limited in the limiting groove 117.

[0075] In the technical solution of the foregoing embodiment, the thermoacoustic film 30 is disposed between the inner shell 12 and the outer shell 11 of the box body 10 to be separated from the speaker 20 in two spaces, so as to avoid the mutual influence of the sounds emitted by the speaker 20 and the thermoacoustic film 30. In this embodiment, a limiting groove 117 is formed in the inner side wall of the outer shell 11, and the thermoacoustic film 30 is limited in the limiting groove 117 to improve the structural and positional stability of the thermoacoustic film 30 fixed in the box body 10; at the same time, the inner side wall of the outer shell 11 and the outer side wall of the inner shell 12 can be made to fit together to avoid a gap between the outer shell 11 and the inner shell 12 due to the arrangement of the thermoacoustic film 30, thereby increasing the volume of the speaker 100.

[0076] In some embodiments, a part of the thermoacoustic film 30 protrudes from the limiting groove 117 to ensure that the inner shell 12 abuts against the thermoacoustic film 30, restricting the vibration of the thermoacoustic film 30 and avoiding resonance.

[0077] With reference to Figure 4 and Figure 7 , in some embodiments of the speaker 100 of the present invention, a vibration groove 118 is formed in the inner side wall of the outer shell 11, the thermoacoustic film 30 covers the mouth of the vibration groove 118, and the second sound outlet hole 116 is formed in the bottom wall of the vibration groove 118.

[0078] It can be understood that when the thermoacoustic film 30 is clamped between the outer side wall of the inner shell 12 and the inner side wall of the outer shell 11, the air around the thermoacoustic film 30 is only the air in the second sound outlet hole 116, so that the air in the second sound outlet hole 116 vibrates and generates sound. In this embodiment, the vibration groove 118 is provided on the inner side wall of the outer shell 11 so that each position of the thermoacoustic film 30 is in contact with air, driving the air in the vibration groove 118 to vibrate and generate sound, so as to further improve the electroacoustic conversion efficiency of the thermoacoustic film 30 and improve the sound output effect of the thermoacoustic film 30.

[0079] In some embodiments of the speaker 100 of the present invention, the aperture range of the second sound outlet hole 116 is 0.6 mm to 2 mm.

[0080] In this embodiment, the aperture range of the second sound outlet hole 116 is defined as between 0.6 mm and 2 mm. The aperture value can be, but is not limited to, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, or 2 mm. Within this range, the sound generated by the thermal sound generating film 30 driving the surrounding air to vibrate can be better transmitted outward, ensuring the sound effect of the thermal sound generating film 30. If the aperture of the second sound outlet hole 116 is less than 0.6 mm, the too small aperture of the second sound outlet hole 116 will reduce the sound volume of the speaker 20, and it is also easy to cause the sound generated by the thermal sound generating film 30 to be too sharp and harsh. Moreover, it will reduce the heat dissipation effect of the second sound outlet hole 116, resulting in the thermal sound generating film 30 not being able to dissipate heat well, affecting the response of the thermal sound generating film 30 to subsequent electrical signals. If the aperture of the second sound outlet hole 116 is greater than 2 mm, it is easy for external impurities to enter the installation cavity 111 and cause damage to the thermal sound generating film 30. If dust and other sundries adhere to the thermal sound generating film 30, it will also affect the heat conduction efficiency of the thermal sound generating film 30, affecting its heating of the surrounding air, resulting in the air being unable to vibrate and generate sound at a frequency corresponding to the electrical signal input to the thermal sound generating film 30, affecting the electroacoustic conversion efficiency.

[0081] Please refer to Figure 1 and Figure 2 , in some embodiments of the speaker 100 of the present invention, the thermal sound generating film 30 is arranged to surround the circumference of the box body 10. The box body 10 is provided with a plurality of the second sound outlet holes 116, and the plurality of the second sound outlet holes 116 are arranged at intervals along the circumference of the box body 10 and are all arranged opposite to the thermal sound generating film 30.

[0082] In this embodiment, the thermal sound generating film 30 is arranged to surround the circumference of the box body 10, and a plurality of second sound outlet holes 116 are opened on the box body 10. The plurality of second sound outlet holes 116 are arranged in an array along the circumference of the box body 10 and are all arranged opposite to the thermal sound generating film 30. With such an arrangement, the thermal sound generating film 30 can radiate sound in all directions, so that users can hear better-quality sound no matter which direction they are in with respect to the speaker 100.

[0083] In an embodiment of the speaker 100 of the present invention, the frequency range of the sound generated by the thermal sound generating film 30 is 0 - 40 kHz.

[0084] In this embodiment, the sound range emitted by the thermoacoustic membrane 30 is within 0 to 40 kHz. Although the audible frequency range for the human body is only from 20 Hz to 20 kHz, the sounds in daily life are composed of a fundamental frequency and overtones, that is, the sound itself includes both audible and inaudible sounds for humans. If only the thermoacoustic membrane 30 is made to emit sounds within the audible frequency range for the human body without including sounds of other frequencies, the waveform of the sound will change, resulting in audio distortion and poor audio restoration. However, in this application, the sound range that the thermoacoustic membrane 30 can emit is between 0 and 40 kHz, which can enable the thermoacoustic membrane 30 to have a high audio restoration degree, making the sound it emits closer to the original sound, so as to provide a better auditory experience for users. The heating temperature range of the thermoacoustic membrane 30 after receiving an electrical signal is between 0 and 80 °C, which can make the sound frequency emitted by the thermoacoustic membrane 30 between 0 and 40 kHz, and also prevent the thermoacoustic membrane 30 from having too high a temperature and affecting other components in the installation cavity 111.

[0085] In some embodiments, the thermoacoustic membrane 30 receives an alternating current audio electrical signal. Under the action of the audio electrical signal, the thermoacoustic membrane 30 can rapidly heat up and cool down, and quickly exchange heat with the surrounding air. The density of the surrounding air also changes accordingly, and then sound waves are emitted through air vibration. Define the current received by the thermoacoustic membrane 30 as I, satisfying -1.5 A ≤ I ≤ 1.5 A, so that the sound frequency emitted by the thermoacoustic membrane 30 is between 0 and 40 kHz, realizing the conversion of "electricity - heat - sound".

[0086] In some embodiments of the speaker 100 of the present invention, define the thickness of the thermoacoustic membrane 30 as d, and satisfy 0 < d ≤ 1 mm.

[0087] With such a setting, the thermoacoustic membrane 30 can have good heat dissipation ability and good toughness, reducing the risk of damage. Among them, the thickness of the thermoacoustic membrane 30 can be, but is not limited to, 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm or 1 mm. If the thickness of the thermoacoustic membrane 30 is greater than 1 mm, due to the excessive thickness of the thermoacoustic membrane 30, the heat dissipation is slow when heat accumulates, which is likely to affect the response efficiency of the thermoacoustic membrane 30 to continuously changing electrical signals.

[0088] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A speaker, characterized in that, Comprising: A box body, the box body includes an outer shell and an inner shell, an installation cavity is formed inside the outer shell, and a first sound outlet hole and a second sound outlet hole communicating the installation cavity and the outside are formed on the side wall of the outer shell; The inner shell is arranged in the installation cavity, the bottom wall of the inner shell is spaced from the bottom wall of the outer shell to form a sound amplification cavity below the inner shell, and the first sound outlet hole communicates with the sound amplification cavity; a containing cavity is formed inside the inner shell, and an installation hole communicating the containing cavity and the sound amplification cavity is formed on the bottom wall of the inner shell; A loudspeaker, the loudspeaker is installed in the installation hole and the sound emitting end of the loudspeaker is arranged towards the sound amplification cavity to radiate sound outwards through the first sound outlet hole; And A thermoacoustic film, the thermoacoustic film is arranged on the box body, the thermoacoustic film is clamped between the outer side wall of the inner shell and the inner side wall of the outer shell, and is arranged opposite to the second sound outlet hole, and the sound frequency band generated when the thermoacoustic film works reaches the high audio frequency band.

2. The speaker according to claim 1, characterized in that, The outer shell includes a cylinder body, a top cover and a bottom cover, the top cover and the bottom cover respectively cover the two end openings of the cylinder body to enclose and form the installation cavity, the bottom cover includes a bottom plate and a surrounding edge, the surrounding edge is arranged around the circumference of the bottom plate, and the first sound outlet hole is formed on the surrounding edge.

3. The speaker according to claim 2, characterized in that, The top wall of the inner shell is spaced from the top cover to enclose and form a receiving cavity, and the electronic control component of the speaker is installed in the receiving cavity, and the thermoacoustic film and the loudspeaker are respectively electrically connected to the electronic control component.

4. The speaker according to claim 1, wherein, A limiting groove is formed on the inner side wall of the outer shell, the second sound outlet hole is formed on the groove bottom wall of the limiting groove, and the thermoacoustic film is limited in the limiting groove.

5. The speaker according to claim 1, wherein, A vibration groove is formed on the inner side wall of the outer shell, the thermoacoustic film covers the notch of the vibration groove and is spaced from the groove bottom wall of the vibration groove, and the second sound outlet hole is formed on the groove bottom wall of the vibration groove.

6. The speaker according to claim 1, characterized in that, The aperture range of the second sound outlet hole is 0.6mm to 2mm; And / or, the thermoacoustic film is arranged around the circumference of the box body, the box body is provided with a plurality of the second sound outlet holes, the plurality of the second sound outlet holes are arranged at intervals along the circumference of the box body, and are all arranged opposite to the thermoacoustic film.

7. The speaker according to claim 1, wherein, The sound frequency f emitted by the thermoacoustic film satisfies 0 < f ≤ 40kHz.

8. The speaker according to any one of claims 1 to 7, characterized in that, The thickness d of the thermoacoustic film satisfies d ≤ 1mm.

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