A sound box

Abstract

The embodiment of the application provides a kind of sound box, the shell of sound box includes two kinds of cavities, first cavity is installed with first loudspeaker, second cavity is installed with second loudspeaker.The first cavity is resonant design, cooperates with the first loudspeaker, both reduce cavity volume and expand low frequency, the first loudspeaker's damping parameter is greater than 3 and greater than second loudspeaker.R=(m*S S ) / D, R is damping parameter, m is the vibrating mass of loudspeaker, S S is the compliance of loudspeaker, D is the aperture of loudspeaker.The second cavity is lightweight design, cooperates with the second loudspeaker, expands high frequency.The organic combination of two kinds of cavities greatly expands the frequency band of sound box, so that small sound box can also emit shocking sound, and can make the volume of large sound box significantly reduced.

Description

Technical Field

[0001] This application relates to the field of acoustic technology, and more particularly to a speaker. Background Technology

[0002] When a speaker is working, it primarily produces sound through its internal speaker unit, which mainly consists of a permanent magnet, a voice coil, and a diaphragm. The principle behind sound production in a speaker unit is based on electromagnetic induction. When an audio current passes through the voice coil, it generates a magnetic field. This magnetic field interacts with the magnetic field of the permanent magnet, causing the voice coil to vibrate axially. The vibration of the voice coil drives the diaphragm to vibrate, thereby creating changes in the density of the surrounding air and forming sound waves. These sound waves travel through the air to the ear and are perceived as sound.

[0003] In speaker applications, to enable speakers to simultaneously deliver high, mid, and low frequencies, a multi-speaker solution is commonly used, with each speaker responsible for a specific frequency range. However, for small speakers, due to their smaller size, the size and number of speaker units are reduced. This leads to traditional small speakers often employing a two-way speaker design, with one speaker handling the high frequencies and the other handling the low and mid frequencies. Consequently, both speaker units tend to have lightweight vibration systems to meet the requirements of small size and convenient use. However, while this lightweight vibration system works well for mid-to-high frequencies, it results in a higher resonant frequency for low frequencies, leading to less than ideal efficiency in low-frequency applications.

[0004] Furthermore, traditional large speaker enclosures have multiple chambers, resulting in a significant overall size. If better low-frequency response is required, an additional, very large subwoofer is often needed, a common configuration. This leads to bulky and cumbersome speaker systems that are difficult to move, waste space, and sometimes obstruct visual view. Moreover, in the market for portable speakers, there is an urgent need for technology that can miniaturize large speaker enclosures while maintaining good sound quality. Summary of the Invention

[0005] To address one of the aforementioned technical deficiencies, this application provides a speaker.

[0006] The present invention adopts the following technical solution:

[0007] A speaker, comprising:

[0008] A housing having a first cavity and a second cavity;

[0009] A first loudspeaker is disposed in the first cavity, and the first cavity is a resonant cavity;

[0010] A second speaker is disposed in the second cavity;

[0011] The slowness parameter of the first speaker is greater than that of the second speaker, and the slowness parameter of the first speaker is greater than 3;

[0012] Where R = (m*S) S ) / D, R is the slack parameter, m is the vibrating mass of the loudspeaker, S S D represents the compliance of the loudspeaker, and D represents the diameter of the loudspeaker.

[0013] Optionally, the ratio of the volume of the first cavity to the volume of the second cavity is (6-9):(4-1).

[0014] Optionally, the lag parameter of the second speaker is less than 1.

[0015] Optionally, the paper components, plastic dust caps, and diaphragm materials in the first speaker are replaced with high-density materials such as stainless steel, and the diaphragm thickness of the first speaker is increased.

[0016] Optionally, the first loudspeaker has a high-density metal voice coil skeleton, which is directly connected to the metal diaphragm of the first loudspeaker to increase weight and improve heat conduction and dissipation.

[0017] Optionally, the diaphragm shape of the first loudspeaker is changed from a conical or dome-shaped shape to a flat structure to reduce the thickness of the first loudspeaker.

[0018] Alternatively, the voice coil of the first loudspeaker can be weighted by increasing its diameter, number of turns, and wire diameter.

[0019] Optionally, the speaker includes a passive radiator and an amplitude limiting mechanism;

[0020] The housing is provided with an opening that connects to the first cavity, and the passive radiator is disposed in the opening;

[0021] The amplitude limiting mechanism is disposed on the housing and is located on the side of the passive radiator.

[0022] Optionally, the slowness parameter of the passive radiator is greater than the slowness parameter of the second loudspeaker, and the slowness parameter of the passive radiator is greater than 3.

[0023] Optionally, the loudspeaker has a weight ratio parameter, wherein the weight ratio parameter of the first loudspeaker is greater than the weight ratio parameter of the second loudspeaker, and the weight ratio parameter of the first loudspeaker is greater than 1.

[0024] Where Q = m / (S) m *L), Q is the weight parameter, m is the vibrating mass of the loudspeaker, Sm Let L be the vibrating area of ​​the loudspeaker, L be the stroke, and L be one-tenth of the diameter of the loudspeaker's vibrating surface.

[0025] Optionally, the speaker is used in a car;

[0026] The first cavity of the speaker is located below the car door, and the second cavity of the speaker is located on or near the A-pillar of the car.

[0027] By adopting the above technical solution, this application has the following beneficial effects:

[0028] The speaker enclosure provided in this application includes two cavities: a first cavity housing a first speaker, and a second cavity housing a second speaker. The volume ratio of the first cavity to the second cavity is (6-9):(4-1). The first cavity is a resonant design, which, in conjunction with the first speaker, reduces the cavity volume while extending the low-frequency response. The slowness parameter of the first speaker is greater than 3 and also greater than that of the second speaker. Wherein, R = (m*S) S ) / D, R is the slack parameter, m is the vibrating mass of the loudspeaker, S S D represents the compliance of the speaker, and D represents the speaker's diameter. The second cavity features a lightweight design and works in conjunction with the second speaker to extend the high frequencies. The organic combination of the two cavities significantly expands the speaker's frequency band, allowing even small speakers to produce powerful sound while also significantly reducing the size of large speakers. Attached Figure Description

[0029] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0030] Figure 1 This is a schematic diagram of the structure of a speaker provided in an embodiment of this application;

[0031] Figure 2 This is a schematic diagram of a second structure of a speaker provided in an embodiment of this application;

[0032] Figure 3 This is a schematic diagram of a third structure of a speaker provided in an embodiment of this application.

[0033] In the diagram: 1. Housing; 101. First cavity; 102. Second cavity; 2. First speaker unit; 3. Second speaker unit; 301. Magnet; 302. Voice coil; 303. Centering support; 304. Diaphragm; 305. Dust cover; 306. Surround; 307. T-shaped iron; 4. Passive radiator. Detailed Implementation

[0034] To make the technical solutions and advantages of the embodiments of this application clearer, the exemplary embodiments of this application will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0035] In the description of this application and its embodiments, it should be understood that the terms "top", "bottom", "height", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0036] In this application and its embodiments, unless otherwise expressly specified and limited, the terms "set," "install," "connect," "link," "fix," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] In this application and its embodiments, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] Related technologies have developed small speaker enclosures, which, in order to minimize size, often consist of only one cavity containing a single speaker. Since this speaker needs to handle high, mid, and low frequencies, its vibration system must be designed for lightweight operation. The lighter the vibration system, the higher the electroacoustic conversion efficiency and the wider the high-frequency bandwidth.

[0039] Taking a closed-back speaker as an example, the low-frequency resonant frequency of the speaker is affected by the vibrating mass and overall compliance of the speaker unit. According to electroacoustic theory, the low-frequency cutoff frequency of a closed-back speaker is close to its resonant frequency. Although the working principle of bass-reflex speakers or other types of speakers is different from that of closed-back speakers, their low-frequency cutoff frequencies are still close to this resonant frequency.

[0040] Small speaker enclosures have a small internal volume, resulting in high air elasticity and low overall compliance. As mentioned earlier, the vibrating mass of the speaker unit is designed for lightweight construction, further reducing the product of vibrating mass and compliance. According to the law of resonance, small speakers tend to have a higher low-frequency resonant frequency, leading to insufficient low-frequency response. Therefore, when listening to traditional small speakers, the sound often feels less impactful, lacking the earth-shaking low-frequency effect of concerts and movie theaters.

[0041] To achieve good sound quality, traditional speaker enclosures require a sufficiently wide frequency response, typically designed with three chambers: high-frequency, mid-frequency, and low-frequency. The high-frequency chamber houses the high-frequency speaker unit, which has a very light vibrating mass, resulting in a wide high-frequency bandwidth and excellent high-frequency sound. The low-frequency chamber houses the low-frequency speaker unit, and to ensure electroacoustic conversion efficiency, its vibrating mass is also designed to be lightweight. To achieve a low lower frequency limit, its compliance must be high, and the chamber volume itself must also be large to ensure high overall compliance. The mid-frequency chamber and mid-frequency speaker unit fall somewhere in between.

[0042] However, for small speakers, due to their small size, the size and number of speaker units are reduced accordingly. This leads to traditional small speakers often employing a two-way speaker design, with one speaker handling the tweeter and the other handling the woofer and midrange. At high frequencies, the tweeter typically has a smaller diameter and a lighter diaphragm to vibrate quickly and produce high-frequency sound. At low frequencies, the woofer usually needs a larger diameter and a heavier diaphragm to move more air and produce low-frequency sound. The convenience and size requirements of small speakers make it easier to make the tweeter lighter, but making the woofer more difficult is more challenging, resulting in the poor low-frequency performance of current small speakers.

[0043] Traditional speaker enclosures have multiple chambers, resulting in a large overall size. If better low-frequency response is required, a very large subwoofer is often added, a common configuration. This leads to bulky and cumbersome speaker systems that are difficult to move, waste space, and sometimes obstruct visual views.

[0044] like Figure 1As shown, this embodiment of the present disclosure provides a speaker, which includes a housing 1, a first speaker 2 and a second speaker 3. The housing 1 has a first cavity 102 and a second cavity 101. The first speaker 2 is disposed in the first cavity 102, which is a resonant cavity, and the second speaker 3 is disposed in the second cavity 101.

[0045] In some possible implementations, the ratio of the volume of the first cavity 102 to the volume of the second cavity 101 is (6-9):(4-1).

[0046] In this embodiment, regardless of the original number of cavities in a traditional speaker, the internal space is redistributed into two types of cavities. The following description uses the first cavity 102 and the second cavity 101 as examples. The first cavity 102 is a resonant design, and the second cavity 101 is a lightweight design. There can be multiple first cavities 102 and multiple second cavities 101, but at least one of each. The resonant cavity is used to reproduce low and ultra-low frequencies, while the lightweight cavity is used to reproduce mid and high frequencies. The speaker provided in this embodiment differs fundamentally from traditional speaker designs: traditional speakers, if divided into two cavities, are always lightweight designs, with one cavity used to reproduce high frequencies and the other to reproduce mid and low frequencies. For example, in this embodiment, the second cavity 101, according to a lightweight design, can be divided into three cavities: high-frequency, mid-frequency, and low-frequency. The first cavity 102, according to a resonant design, can have two cavities, one operating at 80 Hz and the other at 30 Hz. Figure 3 As shown, the housing 1 contains a first cavity 102 and two second cavities 101. The first cavity 102 houses a first speaker 2, and the two second cavities 101 house a second speaker 3a and a second speaker 3b, respectively. The second speaker 3a is responsible for high frequencies, the second speaker 3b is responsible for mid frequencies, and the first speaker 2 is responsible for low frequencies. The volumes of the cavities corresponding to the second speaker 3a, the second speaker 3b, and the first speaker 2 increase sequentially.

[0047] It should be noted that the first cavity 102 is a resonant cavity design. The first speaker 2 inside it also reduces the resonance quality factor and widens the frequency band by strengthening the magnetic field and increasing the voice coil, so that the frequencies of the first speaker 2 and the second speaker 3 can be connected.

[0048] In some alternative embodiments, the first cavity 102 is a resonant cavity, and the second cavity 101 is a lightweight cavity. The purpose of the lightweight cavity is to make the mass of the vibration system inside the second cavity 101 as light as possible to improve the high-frequency effect, while also meeting the overall lightweight requirement. The purpose of the resonant cavity is to reduce the resonant frequency inside the first cavity 102, so that the low frequency is emitted at the resonant frequency, thereby improving the low-frequency sound effect.

[0049] The elasticity within the speaker enclosure includes air elasticity, surround elasticity, and the elasticity of the centering support. If the surround elasticity and the centering support elasticity remain constant, when the air elasticity increases, the total elasticity within the entire second cavity 101 increases, meaning the total compliance decreases. Total compliance is calculated by adding the elasticities K of the surround, the centering support, and the air within the speaker enclosure, and then taking the reciprocal. According to the formula for resonant frequency...

[0050] Thus obtain

[0051] Where k represents the total elasticity, m represents the mass of the speaker's vibration system, and S is the total compliance. In traditional small speakers using a two-way crossover enclosure, due to the small volume and approximately equal cavity proportions, the elasticity k of the air inside the enclosure is large, resulting in a small total compliance S. When pursuing lightweight design, the product of the vibration system mass m and the total compliance S is even smaller. Consequently, the low-frequency resonant frequency f0 of the small speaker is too high, leading to insufficient low frequencies, which is convenient for high-frequency use. Furthermore, the sound decays rapidly beyond the resonant frequency. Since more air needs to be propelled for low-frequency sound production, this application increases the volume of the first cavity 102 and decreases the volume of the second cavity 101. This allows for more air to be propelled in the first cavity 102 for low-frequency sound production, while simultaneously increasing the elasticity k of the air in the second cavity 102 and decreasing the total compliance S, better meeting the requirements for lightweight high-frequency use.

[0052] In a speaker enclosure, the air inside can be considered an air spring. When the speaker diaphragm vibrates, it compresses or stretches the air inside the enclosure. According to the ideal gas law PV = nRT, where P is pressure, V is volume, n is the amount of substance, R is the universal gas constant, and T is temperature. From an elasticity perspective, elasticity can be simply understood as the ability of an object to deform under stress and return to its original shape after the force is removed. For the air inside the speaker enclosure, elasticity can be measured using the bulk modulus of elasticity. The negative sign indicates that the volume decreases when the pressure increases. Therefore, when the volume V decreases, at the same rate of volume change... When the volume of the second cavity 101 decreases, the elastic modulus K increases, meaning the elasticity of the air increases. This decreases the elasticity K value of the air within the second cavity 101, reducing the overall compliance S. Consequently, when the mass of the vibration system (i.e., the diaphragm mass) is reduced, the high-frequency performance within the second cavity 101 is better. Conversely, when the volume of the first cavity 102 increases, the elasticity K value of the air within the first cavity 102 decreases, increasing the overall compliance S. This results in better low-frequency performance in the first cavity 102.

[0053] In this embodiment, the vibration system of the second speaker 3 is designed with lightweight principles in mind, aiming to maximize the efficiency of the second speaker 3 and broaden the high-frequency band. Since bass is not required, the vibration system can be designed to be lighter, resulting in higher efficiency, a wider high-frequency band, and better treble quality. The first speaker 2, however, operates on a different principle, taking the opposite approach. It intentionally increases the mass of its vibration system, no longer relying on lightweighting to improve efficiency, but instead combining this with overall compliance, using resonance to improve electroacoustic conversion efficiency. While maintaining high efficiency, it significantly reduces the low-frequency resonance frequency, resulting in better bass quality as well.

[0054] For example, if the vibrating mass of the first speaker 2 is increased to 6 times its original value, and the volume of the first cavity 102 is increased to 0.7 times its original value, the product of the two is 4.2 times the original value. Taking the square root, it is approximately equal to 2 times. Taking the reciprocal, this means that the resonant frequency can be reduced to half its original value. A high-quality traditional small speaker can achieve a low-frequency resonant frequency of 100 Hz. If the new technology can reduce it to half its original value, it becomes 50 Hz. This significantly expands the low-frequency range, allowing even a small speaker to produce a powerful sound.

[0055] Excessive vibration mass in the design may lead to problems such as low-frequency lag. However, practice has shown that this can be solved. For example, the low-frequency lag problem can be solved by strengthening the magnetic field design of the speaker unit, controlling the resonance peak amplitude through software and hardware, and delaying the signal of the second speaker 3 through circuitry.

[0056] In some possible implementations, the loudspeakers have a lag parameter, wherein the lag parameter of the first loudspeaker 2 is greater than the lag parameter of the second loudspeaker 3, and the lag parameter of the first loudspeaker 2 is greater than 3. Wherein, R = (m*S) S ) / D, R is the slack parameter, m is the vibrating mass of the loudspeaker, S S D represents the compliance of the loudspeaker, and D represents the diameter of the loudspeaker.

[0057] Compared with traditional loudspeakers, the first loudspeaker 2 in this embodiment provides a resonant cavity, the vibrating mass of the first loudspeaker 2 inside the cavity is very large, the compliance of the loudspeaker unit itself is very large, and the low-frequency sound output of the first loudspeaker 2 is excellent.

[0058] In summary, the speaker housing 1 provided in this application includes two cavities: a first cavity 102 housing a first speaker 2, and a second cavity 101 housing a second speaker 3. The volume ratio of the first cavity 102 to the second cavity 101 is (6-9):(4-1). The first cavity 102 is a resonant design, which, in conjunction with the first speaker 2, reduces the cavity volume and expands the low-frequency response. The latency parameter of the first speaker 2 is greater than 3 and also greater than that of the second speaker 3. Wherein, R = (m*S) S) / D, R is the slack parameter, m is the vibrating mass of the loudspeaker, S S D represents the compliance of the speaker, and D represents the diameter of the speaker. The second cavity 101 is a lightweight design, working in conjunction with the second speaker 3 to extend the high frequencies. The organic combination of the two cavities significantly expands the speaker's frequency band, allowing even small speakers to produce powerful sound while also significantly reducing the size of large speakers.

[0059] The larger the diameter D of the loudspeaker unit, the larger the vibrating mass m of the loudspeaker unit, and the larger the compliance S of the loudspeaker unit itself. S The larger the value, the greater the compliance. Therefore, the term "the vibrating mass of the first loudspeaker 2 is very large, and the compliance of the loudspeaker unit itself is very large" in the above text is a relative concept and must be applied to a loudspeaker unit of a specific diameter. Therefore, in the embodiments of this application, a lag parameter R = (m*S) is defined. S ) / D. As shown in the table below, the slack parameter R of the first loudspeaker 2 inside the resonant cavity. A A ratio R much greater than that of traditional speaker units B The slowness parameter R of a traditional loudspeaker unit B It is less than 1, or even much less than 1. After reviewing a large amount of publicly available data, the ratio R of traditional loudspeaker units has not yet been found. B It is equal to or greater than 1, but most are much less than 1. According to the law of resonance, when R... A For R B When the volume is doubled, the benefit of a √2-fold decrease in the low-frequency resonant frequency of the loudspeaker is obtained, or the benefit of halving the equivalent volume is obtained.

[0060] Comparison table of the slowness parameter R of different brands of speakers

[0061]

[0062]

[0063]

[0064]

[0065] As can be seen from the data in the table above, compared with other traditional brands, the first speaker 2 of the speaker provided in this embodiment has a significantly larger latency parameter, with the parameter ratio even reaching 2 to more than 20 times. According to the formula... It can be seen that the low-frequency resonant frequency of the first speaker 2 of the speaker in this application is significantly lower, and the low-frequency sound output is excellent, which meets the high-frequency and low-frequency requirements when using a small speaker.

[0066] It's worth noting that some traditional small speakers also employ a two-way speaker design, meaning two speaker units. However, these typically consist of one unit handling the high frequencies and the other handling the mid and low frequencies. Therefore, both speaker units tend to prioritize lightweight vibration systems, essentially remaining traditional technology. Changing the speaker from one unit to two increases the overall size, making it impossible to manufacture a product within a specified volume. Traditionally, larger speakers can achieve excellent low-frequency performance. This is because the larger cabinet volume results in greater overall compliance, allowing for very low low-frequency resonance even with a lightweight vibrating mass. The technical solution provided in this application, however, enables a small speaker to produce powerful sound.

[0067] In some possible embodiments, the damping parameter of the second speaker 3 is less than 1. The second speaker 3 is a lightweight cavity, the purpose of which is to make the mass of the vibration system inside the second cavity 101 as light as possible to improve high-frequency performance, while also meeting the overall lightweight requirement. The second speaker 3, together with the first speaker 2, allows a small speaker enclosure to handle both high and low frequencies, improving the user experience.

[0068] In some possible embodiments, the ratio of the latency parameter of the first speaker 2 to the latency parameter of the second speaker 3 is greater than A. For example, A is 5 to 15. When R... A For R B When the frequency is 5 to 15 times lower, the low-frequency resonant frequency of the speaker decreases by √5 to 15 times, resulting in better low-frequency sound output from the first speaker 2 and improving the user experience.

[0069] To increase the damping parameters of the first loudspeaker 2, its vibrating mass can be increased. For example, the voice coil diameter, number of turns, and wire diameter can be increased to make the voice coil heavier. Alternatively, the lightweight voice coil skeleton of the first loudspeaker 2 can be replaced with a high-density metal voice coil skeleton, increasing both weight and heat dissipation. The metal voice coil skeleton can be directly connected to the diaphragm of the first loudspeaker 2, thereby increasing the heat dissipation performance of the speaker enclosure. The paper or plastic dust cap and diaphragm of the first loudspeaker 2 can also be made heavier; for example, by replacing the material with high-density materials such as stainless steel, which can significantly increase the diaphragm thickness. Finally, the shape of the diaphragm and dust cap of the first loudspeaker 2 can be changed from conical or dome-shaped to a planar sheet, thereby reducing the thickness of the loudspeaker unit. Due to the increased mass and significantly increased thickness, the rigidity also increases significantly, eliminating the need for conical, arc-shaped, or sandwich structures to increase strength. This results in a reduction in the volume of the loudspeaker unit, further shrinking the size of the speaker enclosure. The planar magnetic diaphragm is preferably made of stainless steel. The heat generated by the voice coil can be directly transferred to the stainless steel. The stainless steel is also very thick, so it has good heat conduction and heat dissipation properties, which solves the problem of heat dissipation inside the speaker cabinet.

[0070] It should be noted that the speaker enclosure 1 of this application is not limited to a traditional cubic enclosure; it can be other carrier shapes. For example, the enclosure can be the shell 1 of a car, such as a car door or even the entire car body. The first cavity 102 can be located below the car door, while the second cavity 101 can be located near the A-pillar of the vehicle.

[0071] In some possible implementations, such as Figure 3 As shown, the speaker includes a passive radiator 4 and an amplitude limiting mechanism. The housing 1 has an opening that communicates with the first cavity 102. The passive radiator 4 is disposed in the opening, and the amplitude limiting mechanism is disposed on the housing 1, with the amplitude limiting mechanism located on the side of the passive radiator 4.

[0072] In this embodiment, the first cavity 102 is a resonant cavity. When it is designed as a bass-reflex speaker, a passive radiator with increased vibrating mass is used instead of a bass reflex tube, which can significantly reduce the cavity space.

[0073] The speaker enclosure of this application is equipped with a passive radiator 4, which significantly increases its vibrating mass. Due to its own vibrating mass and compliance, the first loudspeaker 2 has a low-frequency resonant frequency. The compliance of the air inside the enclosure drives the corresponding passive radiator mass to vibrate, forming another low-frequency resonant frequency. Overall, it becomes a fourth-order filter, making the low frequencies purer.

[0074] On one or both sides of the passive radiator 4, an amplitude limiting mechanical device is added to prevent abnormal sound from being generated when the amplitude is too high due to the high resonance quality factor. The amplitude limiting component can be made of damping materials such as rubber, silicone, cotton cloth, or felt to eliminate collision sound.

[0075] The speaker enclosure of this application incorporates a passive radiator 4, which enhances bass performance through the air spring effect. Used in conjunction with the first speaker 2, it provides a superior sound quality experience. The passive radiator 4 itself lacks a voice coil and drive magnet; it enhances bass through the air spring effect, utilizing air vibrations caused by the radiation from the active unit. This design allows the passive radiator 4 to resonate at different frequencies, thereby optimizing the bass performance of the speaker system.

[0076] In some possible implementations, the damping parameter of the passive radiator 4 is greater than that of the second speaker 3, and the damping parameter of the passive radiator 4 is greater than 3. The passive radiator 4 of this application is similar to the first speaker 2, also requiring increased vibrating mass and greater compliance. Experiments have shown that when the damping parameter of the passive radiator 4 is greater than 3, the bass performance of the speaker system is further optimized, improving the user experience.

[0077] In some possible implementations, the loudspeakers have a weight ratio parameter, wherein the weight ratio parameter of the first loudspeaker 2 is greater than that of the second loudspeaker 3, and the weight ratio parameter of the first loudspeaker 2 is greater than 1, where Q = m / (S m *L), Q is the weight parameter, m is the vibrating mass of the loudspeaker, S m Let L be the vibrating area of ​​the loudspeaker, and L be the stroke, which is one-tenth of the diameter of the loudspeaker's vibrating surface. Preferably, the weight ratio parameter of the second loudspeaker 3 is 0.05 to 0.35, and the ratio of the weight ratio parameter of the first loudspeaker 2 to that of the second loudspeaker 3 is 7 to 15. The table below shows a comparison of the weight ratio parameter Q of loudspeakers from different brands.

[0078] Comparison table of gravity parameters Q of different brands of loudspeakers

[0079]

[0080]

[0081]

[0082]

[0083] As can be seen from the data in the table above, compared with other traditional brands, the first speaker 2 of the speaker provided in this embodiment has a significantly larger weight ratio parameter, with its ratio to the second speaker 3 reaching 7 to 15 times. Experiments have shown that the weight ratio parameter of the first speaker 2 of this application is greater than 1, resulting in a significant low-frequency effect.

[0084] The first loudspeaker 2 provided in this embodiment deviates from convention by replacing its diaphragm with a metal sheet, such as stainless steel, which has a density of 7.8 g / cm³, 3-4 times that of paper or plastic. This results in a significantly heavier vibrating mass, moving away from relying primarily on reducing vibrating mass to improve efficiency based on Newton's law of acceleration. Instead, efficiency is primarily improved through mechanical resonance. Mechanical resonance, also known as coherence, is a powerful force achieved with minimal effort. For example, in daily life, trains cannot maintain a constant speed when crossing bridges to avoid resonance and potential damage. Similarly, tall buildings are equipped with dampers to prevent excessive swaying and damage when resonating with wind or other vibration sources. The loudspeaker unit is integrated with the subwoofer enclosure, utilizing the total elasticity of the enclosure and the loudspeaker unit, along with the total vibrating mass of the loudspeaker unit including the diaphragm, to resonate, effectively improving the electroacoustic conversion efficiency at the resonant frequency. The total elasticity includes the air inside the enclosure, the surround of the loudspeaker unit, and the spring. Aluminum sheets have a density of 2.7 g / cm³, making them thicker than stainless steel for the same area. While this increases the thickness of the speaker unit, it also provides better heat dissipation than stainless steel, making them suitable for applications where size requirements are not critical but heat dissipation is important.

[0085] So, what is a suitable mass for a vibration system? Research and analysis are as follows. We know that the larger the diameter of the speaker unit, the more air it pushes, meaning a larger exhaust volume. Simultaneously, a larger diameter speaker unit has a heavier vibrating mass. We define the aforementioned weight ratio parameter Q, which is essentially the ratio of mass to exhaust volume, that is, the ratio of the vibrating mass of the speaker unit to the volume of air it pushes. The volume of air pushed is the product of the vibrating area and the vibration amplitude of the speaker unit. Referring to the comparison table of weight ratio parameters Q for different brands of speakers, it is clear that the weight ratio parameter of traditional speaker units is very small, typically around 0.1 to 0.3 (unit: grams per cubic centimeter). In the embodiments of this application, a thicker metal sheet is used as the diaphragm, resulting in a weight ratio parameter greater than 0.5, even 1 to 3. Under the same exhaust volume conditions, to maintain a constant low-frequency cutoff, a heavier vibrating mass allows for greater overall elasticity, resulting in less air inside the speaker enclosure and effectively reducing the volume of the subwoofer enclosure. Of course, the gravity parameter cannot be too large, there is a limit. If it is too large, the resonance time will be too long and it will be difficult to stop. Subjectively, there will be a feeling of sound delay when listening, which will become unacceptable if it reaches a certain level.

[0086] It should be noted that the first speaker 2 of this application forms an acoustic filter through resonance, filtering out unwanted frequencies and outputting the desired frequencies with high efficiency, bringing a purer sound quality to the subwoofer.

[0087] In this embodiment, the first speaker 2 can use a stainless steel sheet as the diaphragm, which easily achieves the required weight and occupies a small volume, effectively reducing the thickness of the speaker unit. Furthermore, since the metal itself has high hardness, it can be made directly into a flat surface, eliminating the need for conical or arc-shaped designs, thus reducing the volume of the speaker unit and indirectly reducing the volume of the speaker enclosure.

[0088] To solve the heat dissipation problem of the speaker, the voice coil frame of the first speaker 2 is directly connected to the metal plate. The heat generated when the voice coil is working is transferred to the metal plate. Because the metal plate is relatively thick, it has good thermal conductivity and heat dissipation. The heat generated by the first speaker 2 is directly dissipated into the air by the surface of the metal plate. The advantages are that the power handling capacity of the first speaker 2 unit is significantly increased, and the overall heat dissipation of the speaker is improved.

[0089] This application achieves beneficial effects such as reducing speaker size and extending the low-frequency limit by changing the design of the speaker and cavity. The technical solution provided in this application can be used not only in bass-reflex speakers but also in traditional sealed speakers, although the speaker size will be slightly larger.

[0090] Figure 2 A schematic diagram of a speaker enclosure is provided. It includes a housing 1 and a first cavity 102 and a second cavity 101 disposed within the housing 1. A first speaker 3 is housed in the first cavity 102, and a second speaker 2 is housed in the second cavity 101. Both the first speaker 3 and the second speaker 2 include a T-shaped iron 307, a voice coil 302, a magnet 301, a centering support 303, a diaphragm 304, a dust cover 305, and a surround 306. Furthermore, the first cavity 102 occupies 70% to 90% of the internal space of the housing 1, while the second cavity 101 occupies 10% to 30% of the internal space of the housing 1. T-shaped iron 307 is fixedly installed in the first cavity 102 and the second cavity 101. Voice coil 302 is sleeved on the outer side of the top part of T-shaped iron 307. Magnet 301 is installed on T-shaped iron 307 and located on the outer side of the upper end of T-shaped iron 307. T-shaped iron 307 is provided with a frame. Centering support 303 is connected between voice coil 302 and frame. Diaphragm 304 is connected to the top of voice coil 302. Boom 306 is connected between the top of diaphragm 304 and frame. Dust cover 305 is provided on the outer side of diaphragm 304.

[0091] The diaphragm 304 of the second speaker 2 can be conical, and the dust cover 305 of the second speaker 2 is arc-shaped. Both the diaphragm 304 and dust cover 305 of the first speaker 3 are flat. The flat design of the diaphragm 304 and dust cover 305 makes it easier to increase the weight of the diaphragm 304. Due to the increased weight, the thickness is significantly increased, thus greatly increasing the rigidity. It eliminates the need for conical, arc-shaped, or sandwich structures to increase strength, resulting in a reduction in the volume of the second speaker 2 and further minimizing the size of the speaker enclosure.

[0092] The diaphragm 304 of the first loudspeaker 3 is made of metal. Stainless steel is preferred. When using a stainless steel diaphragm 304, the heat generated by the voice coil 302 can be directly transferred to the stainless steel. Stainless steel or other metal materials can provide better heat conduction than soft diaphragms such as plastic. Since the stainless steel diaphragm 304 is thicker, the heat conduction time is increased, which can also solve the problem of heat dissipation inside the speaker enclosure.

[0093] The foregoing disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0094] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0095] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A speaker, characterized in that, include: A housing having a first cavity and a second cavity; A first loudspeaker is disposed in the first cavity, and the first cavity is a resonant cavity; A second speaker is disposed in the second cavity; The ratio of the slowness parameter of the first speaker to the slowness parameter of the second speaker is greater than A, where A is 5 to 15, and the slowness parameter of the first speaker is greater than 3. Where R=(m*S) S ) / D, R is the slack parameter, m is the vibrating mass of the loudspeaker, S S Where D is the compliance of the loudspeaker, and D is the diameter of the loudspeaker. The weight ratio parameter of the first speaker is greater than that of the second speaker, and the weight ratio parameter of the first speaker is greater than 1. Where Q=m / (S) m *L), Q is the weight parameter, m is the vibrating mass of the loudspeaker, S m Where is the vibrating area of ​​the loudspeaker, L is the stroke, and is one-tenth of the diameter of the loudspeaker's vibrating surface; The diaphragm shape of the first loudspeaker is changed from a conical or dome shape to a flat structure to reduce the thickness of the first loudspeaker.

2. The speaker according to claim 1, characterized in that, The ratio of the volume of the first cavity to the volume of the second cavity is (6-9):(4-1).

3. The speaker according to claim 1, characterized in that, The slowness parameter of the second speaker is less than 1.

4. The speaker according to claim 1, characterized in that, The paper components, plastic dust cap, and diaphragm material inside the first speaker have all been replaced with stainless steel, and the diaphragm thickness of the first speaker has been increased.

5. The speaker according to claim 1, characterized in that, The first loudspeaker has a metal voice coil skeleton, which is directly connected to the metal diaphragm of the first loudspeaker to increase weight and improve heat conduction and dissipation.

6. The speaker according to claim 1, characterized in that, The voice coil of the first loudspeaker is weighted up by increasing its diameter, number of turns, and wire diameter.

7. The speaker according to claim 1, characterized in that, Including passive radiators and amplitude limiting mechanisms; The housing is provided with an opening that connects to the first cavity, and the passive radiator is disposed in the opening; The amplitude limiting mechanism is disposed on the housing and is located on the side of the passive radiator.

8. The speaker according to claim 7, characterized in that, The slowness parameter of the passive radiator is greater than that of the second loudspeaker, and the slowness parameter of the passive radiator is greater than 3.

9. The speaker according to any one of claims 1-8, characterized in that, The speaker is for use in automobiles; The first cavity of the speaker is located below the car door, and the second cavity of the speaker is located on the A-pillar of the car.

10. The speaker according to any one of claims 1-8, characterized in that, The number of the first cavity is one or more; The number of the second cavity is one or more.

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