Sound box

Abstract

The embodiment of the invention provides a sound box, the shell of the sound box comprises two cavities, the first cavity is internally provided with a first loudspeaker, and the second cavity is internally provided with a second loudspeaker. The first cavity is designed in a resonant mode and is matched with the first loudspeaker, the size of the cavity is reduced, the low frequency is expanded, and the slowness parameter of the first loudspeaker is larger than 3 and larger than that of the second loudspeaker. Wherein R = (m * SS) / D, R is a slowness parameter, m is the vibration quality of the loudspeaker, SS is the compliance of the loudspeaker, and D is the aperture of the loudspeaker. And the second cavity is designed to be lightweight and is matched with the second loudspeaker to expand high frequency. The two cavities are organically combined, so that the frequency band of the loudspeaker box is greatly expanded, a small loudspeaker box can give out shocking sound, and the size of a large loudspeaker box can be remarkably reduced.

Description

Technical Field

[0001] The present application relates to the field of acoustic technology, and in particular to a sound box. Background Art

[0002] When the speaker is working, it mainly produces sound through the internal speaker unit, which is mainly composed of a permanent magnet, a voice coil and a diaphragm. The principle of the speaker unit's sound production is based on the phenomenon of electromagnetic induction. When the audio current passes through the voice coil, a magnetic field is generated, which 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, causing the surrounding air to change in density and form sound waves. The sound waves are transmitted through the air to the human ear and are perceived by the human ear as sound.

[0003] In the use of speakers, in order to make the speakers have high, medium and low sounds at the same time, a multi-speaker solution is generally adopted, that is, each speaker is responsible for the corresponding sound. However, for small speakers, due to the small size of the speakers, the size and number of the existing speaker units are reduced accordingly, resulting in traditional small speakers often using a two-way speaker, that is, two speaker units. One speaker is responsible for the treble, and the other speaker is responsible for the bass and mid-range. Therefore, both speaker units tend to lightweight the vibration system to meet the needs of small and convenient use. However, the lightweight vibration system works well when it is applied to medium and high frequencies. When it is applied to low frequencies, it will cause the resonance frequency of the low frequencies to be higher, resulting in less than ideal efficiency in the use of low frequencies.

[0004] Furthermore, traditional large speakers have many cavities and the overall size of the speakers is already large. If you need better low frequencies, you need to add a very large subwoofer, which is a common configuration. This makes the speaker system large and bloated, inconvenient to carry, wastes space, and sometimes causes visual obstruction. In addition, in the market for portable speakers, there is an urgent need for a technology that can miniaturize large speakers while maintaining good sound quality. Summary of the invention

[0005] In order to solve one of the above-mentioned technical defects, an embodiment of the present application provides a speaker.

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

[0007] A sound box, comprising:

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

[0009] a first speaker, wherein the first speaker is disposed in the first cavity, and the first cavity is a resonant cavity;

[0010] a second speaker, wherein the second speaker is disposed in the second cavity;

[0011] The slowness parameter of the first speaker is greater than the slowness parameter 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 slowness parameter, m is the vibration mass of the speaker, S S is the compliance of the speaker, and D is the diameter of the speaker.

[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, a slowness parameter of the second speaker is less than 1.

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

[0016] Optionally, the first speaker has a high-density metal voice coil frame, and the high-density metal voice coil frame is directly connected to the metal diaphragm of the first speaker to increase the weight and improve the thermal conductivity and heat dissipation effect.

[0017] Optionally, the shape of the diaphragm of the first speaker is changed from a cone shape, a dome shape, etc. to a flat structure to reduce the thickness of the first speaker.

[0018] Optionally, the voice coil of the first speaker is weighted by increasing the diameter, number of turns and wire diameter of the voice coil of the first speaker.

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

[0020] The housing is provided with an opening communicating with the first cavity, and the passive radiator is arranged in the opening;

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

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

[0023] Optionally, the speaker has a weight-ratio parameter, the weight-ratio parameter of the first speaker is greater than the weight-ratio parameter of the second speaker, and the weight-ratio parameter of the first speaker is greater than 1;

[0024] Where Q = m / (S m *L), Q is the weight parameter, m is the vibration mass of the speaker, Sm is the vibration area of ​​the loudspeaker, and L is the travel distance, which is one tenth of the diameter of the loudspeaker's vibration surface.

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

[0026] The first cavity of the sound box is located under the door of the car, and the second cavity of the sound box is located at the A-pillar of the car or a position close to the A-pillar of the car.

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

[0028] The shell of the speaker provided in the embodiment of the present application includes two cavities, a first speaker is installed in the first cavity, and a second speaker is installed in the second cavity. The ratio of the volume of the first cavity to the volume of the second cavity is (6-9): (4-1). The first cavity is a resonant design, which cooperates with the first speaker to reduce the volume of the cavity and expand the low frequency. The slowness parameter of the first speaker is greater than 3 and greater than that of the second speaker. Among them, R = (m*S S ) / D, R is the slowness parameter, m is the vibration mass of the speaker, S S is the compliance of the speaker, and D is the caliber of the speaker. The second cavity is lightweight and works with the second speaker to expand the high frequency. The organic combination of the two cavities greatly expands the frequency band of the speaker, allowing a small speaker to produce a shocking sound while significantly reducing the size of the large speaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0030] Figure 1 A schematic diagram of the structure of a speaker provided in an embodiment of the present application;

[0031] Figure 2 A second structural schematic diagram of the speaker provided in the embodiment of the present application;

[0032] Figure 3 A third structural schematic diagram of the speaker provided in an embodiment of the present application.

[0033] In the figure: 1. shell; 101. first cavity; 102. second cavity; 2. first speaker unit; 3. second speaker unit; 301. magnet; 302. voice coil; 303. centering support plate; 304. diaphragm; 305. dust cover; 306. folding ring; 307. T-shaped iron; 4. passive radiator. DETAILED DESCRIPTION

[0034] In order to make the technical solutions and advantages in the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than an exhaustive list of all the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0035] In the description of the present application and its embodiments, it should be understood that the orientation or positional relationship indicated by the terms "top", "bottom", "height", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0036] In the present application and its embodiments, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0037] In the present application and its embodiments, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] The related art provides a small speaker, which usually has only one cavity in order to miniaturize the volume. Since the speaker needs to take into account the high pitch, mid-range and bass, its vibration system must be designed to be lightweight. The lighter the vibration system, the higher the electroacoustic conversion efficiency and the wider the high-frequency band.

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

[0040] The volume inside a small speaker is small, so the elasticity of the air inside the box is very large, and the total compliance is very small. As mentioned above, the vibration mass of the speaker unit is designed to be lightweight, so the product of the vibration mass and compliance is even smaller. According to the formula of the resonance law, the low-frequency resonance frequency of a small speaker is high, which leads to insufficient low frequency of the small speaker. Therefore, when we listen to traditional small speakers, we always feel that the sound is not shocking enough, and there is no earth-shaking low-frequency effect like concerts and movie theaters.

[0041] In order to obtain good sound quality, traditional speakers need to be designed with a wide enough frequency response. They are usually designed with three cavities: high frequency, mid-frequency, and low frequency. The high frequency speaker unit is installed in the high frequency cavity. The vibration mass is very light, so the high frequency band is very wide and the high frequency sound is very good. The low frequency speaker unit is installed in the low frequency cavity. To ensure the efficiency of electroacoustic conversion, its vibration mass is also lightweight. To obtain a lower lower limit frequency, its compliance must be increased, and the volume of the cavity itself must also be increased to ensure a large total compliance. The mid-frequency cavity and mid-frequency speaker unit are in between.

[0042] However, for small speakers, due to the small size of the speakers, the size and number of existing speaker units are reduced, resulting in traditional small speakers often using a two-way speaker, i.e., two speaker units, one speaker is responsible for high pitch, and the other speaker is responsible for low pitch and mid-range. At high frequencies, high-frequency speakers usually have a smaller caliber and a lighter diaphragm so that they can vibrate quickly to produce high-frequency sounds, while at low frequencies, low-frequency speakers usually have a larger caliber and a heavier diaphragm so that they can push more air to produce low-frequency sounds. The convenience and volume requirements of small speakers make it easier to handle high-frequency speakers, while it is more troublesome to handle low-frequency speakers, resulting in poor effects of current small speakers in low-frequency use.

[0043] Because traditional speakers have many cavities, the overall size of the speakers is already very large. If you need better low frequencies, you need to add a very large subwoofer. This configuration is very common. This makes the speaker system large and bloated, inconvenient to carry, wastes space, and sometimes causes visual obstruction.

[0044] like Figure 1As shown, a sound box is provided in an embodiment of the present disclosure, which includes a shell 1, a first speaker 2 and a second speaker 3, the shell 1 has a first cavity 102 and a second cavity 101, the first speaker 2 is arranged in the first cavity 102, the first cavity 102 is a resonance cavity, and the second speaker 3 is arranged 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 the embodiment of the present application, no matter how many cavities there are originally in the internal space of the traditional speaker, the internal space is redistributed and divided into two types of cavities. The first cavity 102 and the second cavity 101 are used as examples below. 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 second cavities 101, but at least one of each. The cavity with a resonant design is used to reproduce low frequencies and ultra-low frequencies, and the cavity with a lightweight design is used to reproduce mid-range frequencies and high frequencies. The audio provided by the embodiment of the present application is essentially different from the traditional speaker design: if the traditional speaker is divided into two cavities, they are all lightweight designs, either one cavity is used to reproduce treble, and the other cavity is used to reproduce mid-range and bass. For example: In the embodiment of the present application, the second cavity 101 can be divided into three cavities of treble, mid-range, and bass according to the lightweight design. The first cavity 102 can be set with two cavities according to the resonant design, one cavity works at 80 Hz, and the other cavity works at 30 Hz, such as Figure 3 As shown, a first cavity 102 and two second cavities 101 are provided in the housing 1. The first cavity 102 is provided with a first speaker 2. The two second cavities 101 are provided with a second speaker 3a and a second speaker 3b respectively. The second speaker 3a is responsible for high pitch, the second speaker 3b is responsible for mid-range, and the first speaker 2 is responsible for low pitch. The cavity volumes corresponding to the second speaker 3a, the second speaker 3b and the first speaker 2 increase in sequence.

[0047] It should be noted that the first cavity 102 is a resonantly designed cavity, and the first speaker 2 therein also reduces the resonance quality factor and widens the frequency band by strengthening the magnetic field and increasing the size of the voice coil, so that the frequencies of the first speaker 2 and the second speaker 3 are connected.

[0048] In some optional 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 in the second cavity 101 as light as possible to improve the high-frequency effect, while also meeting the overall lightweight requirements. The purpose of the resonant cavity is to reduce the resonant frequency in the first cavity 102, so that the low frequency is emitted at the resonant frequency, thereby improving the effect of low-frequency sound generation.

[0049] The elasticity in the sound box cavity includes the elasticity of air, the elasticity of the folding ring and the elasticity of the centering support. If the elasticity of the folding ring and the elasticity of the centering support remain unchanged, when the air elasticity increases, the total elasticity in the entire second cavity 101 increases, that is, the total compliance decreases. The total compliance is obtained by adding the elasticity K of the folding ring, the shaping support and the air in the sound box and then taking the inverse. According to the formula of the resonant frequency,

[0050] Thus we get

[0051] Among them, k represents the total elasticity, m represents the mass of the speaker vibration system, and S is the total compliance. In the traditional small speaker using a two-way speaker, due to the small volume inside the small speaker and the approximate ratio of the cavity partition in the small speaker, the elasticity k value of the air inside the small speaker is large, and the corresponding total compliance S is small. When pursuing lightweight, the product of the vibration system mass m and the total compliance S is smaller, so the low-frequency resonance frequency f of the small speaker is obtained according to the resonance frequency 0 The volume of the first cavity 102 of the small speaker is increased, and the volume of the second cavity 101 is reduced, so that the first cavity 102 can meet the requirements of more air for low-frequency sound generation, and at the same time, the elasticity K value of the air in the second cavity 102 can be increased, and the total compliance S can be reduced, which can better meet the requirements of lightweight high-frequency use.

[0052] In a speaker, the air inside the box can be regarded as an air spring. When the speaker diaphragm vibrates, it compresses or stretches the air inside the box. According to the ideal gas state equation PV=nRT, P is pressure, V is volume, n is the amount of substance, R is the universal gas constant, and T is temperature. From the perspective of elasticity, elasticity can be simply understood as the ability of an object to deform when subjected to force and to return to its original shape after the force disappears. For the air in the speaker box, elasticity can be measured by the bulk modulus. Bulk modulus The negative sign indicates that the volume decreases when the pressure increases, so when the volume V decreases, at the same rate of volume change Under this condition, the elastic modulus K will increase, that is, the elasticity of the air will increase. The volume of the space in the second cavity 101 decreases, which increases the elasticity K value of the air in the second cavity 101 and reduces the total compliance S, thereby reducing the mass of the vibration system, that is, the mass of the diaphragm, and the high-frequency effect in the second cavity 101 will be better. The volume of the space in the first cavity 102 increases, which reduces the elasticity K value of the air in the first cavity 102 and increases the total compliance S, thereby making the low-frequency effect of the first cavity 102 better.

[0053] In the embodiment of the present application, the vibration system of the second speaker 3 is designed according to the principle of lightweight design, and the efficiency of the second speaker 3 is improved as much as possible and the high-frequency band is widened. Since there is no need to take into account the bass, the vibration system can be designed to be lighter, so the efficiency will be higher, the high frequency will be wider, and the sound quality of the treble will become better. The working principle of the first speaker 2 is different. It goes the other way and deliberately increases the mass of the vibration system. It no longer relies on lightweight to improve efficiency, but cooperates with the total compliance and relies on resonance to improve the electroacoustic conversion efficiency. While maintaining high efficiency, it greatly reduces the low-frequency resonance frequency, making the sound quality of the bass better.

[0054] For example, if the vibration mass of the first speaker 2 is increased to 6 times, and the volume of the first cavity 102 is 0.7 times, the product of the two is 4.2 times, and the square root is approximately equal to 2. Taking the reciprocal means that the resonance frequency can be reduced to 1 / 2 of the original. The low-frequency resonance frequency of a high-quality traditional small speaker can reach 100 Hz. If the new technology can reduce it to 1 / 2, it will become 50 Hz, which greatly expands the low frequency and the small speaker can also produce a shocking sound.

[0055] A design with too large a vibrating mass may cause problems such as low-frequency lag. Practice has proved 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 a circuit.

[0056] In some possible implementations, the speaker has a slowness parameter, the slowness parameter of the first speaker 2 is greater than the slowness parameter of the second speaker 3, and the slowness parameter of the first speaker 2 is greater than 3. S ) / D, R is the slowness parameter, m is the vibration mass of the speaker, S S is the compliance of the speaker, and D is the diameter of the speaker.

[0057] Compared with traditional speakers, the first speaker 2 of the embodiment of the present application provides a resonant cavity. The vibration mass of the first speaker 2 in the cavity is very large, the compliance of the speaker unit itself is very large, and the low-frequency sound of the first speaker 2 is excellent.

[0058] In summary, the shell 1 of the speaker provided in the embodiment of the present application includes two cavities. The first speaker 2 is installed in the first cavity 102, and the second speaker 3 is installed in the second cavity 101. The ratio of the volume of the first cavity 102 to the volume of the second cavity 101 is (6-9): (4-1). The first cavity 102 is a resonant design, which cooperates with the first speaker 2 to reduce the cavity volume and expand the low frequency. The slowness parameter of the first speaker 2 is greater than 3 and greater than the second speaker 3. Among them, R=(m*SS ) / D, R is the slowness parameter, m is the vibration mass of the speaker, S S is the compliance of the speaker, and D is the caliber of the speaker. The second cavity 101 is lightweight in design and cooperates with the second speaker 3 to expand high frequencies. The organic combination of the two cavities greatly expands the frequency band of the speaker, allowing a small speaker to produce a shocking sound and significantly reducing the size of the large speaker.

[0059] The larger the diameter D of the speaker unit, the larger the vibration mass m of the speaker unit, and the compliance S of the speaker unit itself S Therefore, the term "the vibration mass of the first speaker 2 is very large, and the compliance of the speaker unit itself is very large" is a relative concept, which should be specific to a speaker unit of a specific caliber. Therefore, in the embodiment of the present application, a slowness parameter R = (m*S S ) / D. As shown in the following table, the slowness parameter R of the first speaker 2 in the resonant cavity A Much larger than the ratio of traditional speaker units B The slowness parameter R of the traditional speaker unit B is less than 1, or even much less than 1. After consulting a large amount of public data, we have not found the ratio R of traditional speaker units. B is equal to or greater than 1, and 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 the speaker's low-frequency resonance frequency being reduced by a factor of 2, or the equivalent volume being halved, is obtained.

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

[0061]

[0062]

[0063]

[0064]

[0065] It can be seen from the data in the above table that, compared with other traditional brands, the first speaker 2 of the speaker provided by the embodiment of the present disclosure has a significantly larger slowness parameter, and the parameter ratio is even 2 to 20 times. It can be seen that the low-frequency resonance frequency of the first speaker 2 of the speaker of the present application is significantly lower, and the low-frequency sound is excellent, which meets the high-frequency and low-frequency requirements when using a small speaker.

[0066] It is worth mentioning that some traditional small speakers also use a two-way speaker, that is, a two-speaker unit solution, but one speaker unit is responsible for the treble, and the other speaker unit is responsible for the midrange and bass. Therefore, both speaker units tend to lightweight the vibration system, which is still a traditional technology in essence. After the speaker is changed from one speaker to two speakers, the entire volume will increase, and it is impossible to make a product within the specified volume. Traditional larger speakers can do very well in low frequencies. This is because the box volume is large, so the total compliance is large, even if the vibration mass is very light, the low-frequency resonance frequency can be made very low. The technical solution provided in the embodiment of the present application enables a small-volume speaker to produce a shocking sound.

[0067] In some possible embodiments, the slowness parameter of the second speaker 3 is less than 1. The second speaker 3 is a lightweight cavity. The purpose of the lightweight cavity is to make the mass of the vibration system in the second cavity 101 as light as possible to improve the high-frequency effect, while also meeting the overall lightweight requirements. The second speaker 3 and the first speaker 2 can cooperate to make a small speaker box take into account both high and low frequencies, thereby improving the user experience.

[0068] In some possible embodiments, the ratio of the slowness parameter of the first speaker 2 to the slowness parameter of the second speaker 3 is greater than A. For example, A is 5 to 15. A For R B When the frequency square root of the low-frequency resonance frequency of the loudspeaker is reduced by 5 to 15 times, the first loudspeaker 2 has a good low-frequency sound, thereby improving the user experience.

[0069] In order to increase the slowness parameter of the first speaker 2, the vibration mass of the first speaker 2 can be increased. For example, the voice coil can be increased by increasing the voice coil diameter, number of turns and wire diameter of the first speaker 2. For another example, the lightweight voice coil skeleton of the first speaker 2 is replaced with a high-density metal voice coil skeleton, which increases the weight and strengthens the heat conduction and heat dissipation. The metal voice coil skeleton can be directly connected to the diaphragm of the first speaker 2, thereby increasing the heat dissipation performance of the speaker box. The paper, plastic and other dust caps and diaphragms of the first speaker 2 can also be weighted. For example, their materials can be replaced with high-density materials such as metal stainless steel, and the thickness of the diaphragm can be significantly increased. Finally, the shape of the diaphragm and dust cap of the first speaker 2 can also be changed from a cone, a dome and other shapes to a flat sheet, thereby reducing the thickness of the speaker unit. Due to the heavy mass and the greatly increased thickness, the rigidity is also greatly increased, and it is no longer necessary to make a cone, an arc, a sandwich and other structures to increase the strength, which leads to a reduction in the volume of the speaker unit, further reducing the volume of the speaker box. Stainless steel is the preferred material for the flat diaphragm. The heat generated by the voice coil can be directly transferred to the stainless steel. The stainless steel is very thick, so it has good thermal conductivity and heat dissipation effects, which incidentally solves the problem of heat difficulty in the speaker.

[0070] It should be noted that the housing 1 of the speaker of the present application is not limited to a cubic box in the traditional sense, and it can be other carrier shapes. For example, the box can be a housing 1 of a car, such as a door or even the entire car body. The first cavity 102 can be arranged under the door, and the second cavity 101 can be arranged 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. An opening connected to the first cavity 102 is provided on the shell 1, the passive radiator 4 is arranged in the opening, the amplitude limiting mechanism is arranged on the shell 1, and the amplitude limiting mechanism is located on the side of the passive radiator 4.

[0072] In the embodiment of the present application, the first cavity 102 is a resonant cavity. When a bass reflex speaker is used in the design, a passive radiator with increased vibration mass is used instead of the bass reflex tube, which can significantly reduce the cavity space.

[0073] The speaker of the present application is equipped with a passive radiator 4, and its vibration mass is also greatly increased accordingly. The first speaker 2 has a low-frequency resonance frequency due to its own vibration mass and compliance, and the compliance of the air in the box drives the corresponding passive radiator mass to vibrate, forming another low-frequency resonance frequency, which generally becomes a fourth-order filter, making the low frequency purer.

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

[0075] The speaker of the present application adds a passive radiator 4, which enhances the bass effect through the air spring effect, and is used in conjunction with the first speaker 2 to provide a better sound quality experience. The passive radiator 4 itself does not have a voice coil and a driving magnet. It enhances the bass effect through the air spring effect, that is, using the air vibration caused by the radiation of the active unit. This design enables the passive radiator 4 to resonate at different frequencies, thereby optimizing the bass performance of the speaker system.

[0076] In some possible implementations, the slowness parameter of the passive radiator 4 is greater than the slowness parameter of the second speaker 3, and the slowness parameter of the passive radiator 4 is greater than 3. The passive radiator 4 of the present application is similar to the first speaker 2, and also needs to increase the vibration mass and have greater compliance. Experiments have shown that when the slowness parameter of the passive radiator 4 is greater than 3, the bass performance of the speaker system is further optimized, and the user experience is improved.

[0077] In some possible implementations, the speaker has a weight-rate parameter, the weight-rate parameter of the first speaker 2 is greater than the weight-rate parameter of the second speaker 3, and the weight-rate parameter of the first speaker 2 is greater than 1, wherein Q=m / (S m *L), Q is the weight parameter, m is the vibration mass of the speaker, S m is the vibration area of ​​the speaker, L is the movement stroke, which is one tenth of the diameter of the speaker vibration surface. Preferably, the gravity parameter of the second speaker 3 is 0.05-0.35, and the ratio of the gravity parameter of the first speaker 2 to the gravity parameter of the second speaker 3 is 7-15. The following table shows a comparison table of gravity parameters Q of speakers of different brands.

[0078] Comparison table of the weight parameter Q of speakers of different brands

[0079]

[0080]

[0081]

[0082]

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

[0084] The first speaker 2 provided in the embodiment of the present application is unconventional. The diaphragm of the first speaker 2 is replaced with a metal sheet with a much higher density and thicker thickness than the traditional diaphragm, such as a stainless steel sheet, with a density of 7.8 g / cm3, which is 3 to 4 times that of paper or plastic, so that the vibration mass is designed to be very heavy. It is no longer mainly based on Newton's law of acceleration to improve efficiency by reducing the vibration mass, but mainly through the method of mechanical resonance to improve efficiency. Mechanical resonance, also known as resonance, is a kind of power that uses small to achieve great. For example, in daily life, when a train passes through a bridge on a river, it cannot maintain a uniform speed to avoid resonance and damage to the bridge. For example, dampers are set in tall buildings to prevent excessive shaking and damage when the building resonates with wind or other vibration sources. The speaker unit is combined with the subwoofer box in which it is located, and the total elasticity of the box and the speaker unit and the total vibration mass of the speaker unit including the diaphragm are used to resonate the two, thereby effectively improving the electroacoustic conversion efficiency at the resonant frequency. The total elasticity includes the air in the box, the folding ring of the speaker unit and the elastic wave. The density of aluminum sheet is 2.7 g / cubic centimeter, which is thicker than stainless steel in the same area. Although it increases the thickness of the speaker unit, it brings better heat dissipation effect than stainless steel on the other hand. It can be used in occasions with low volume requirements but high heat dissipation requirements.

[0085] So how much mass is appropriate for the vibration system? After research, the analysis is as follows. We know that the larger the caliber of the speaker unit, the more air it pushes, that is, the larger the exhaust volume. At the same time, the larger the caliber of the speaker unit, the heavier its vibration mass. We define the above-mentioned gravity parameter Q, which is essentially the ratio of mass to exhaust volume, that is, the ratio of the vibration mass of the speaker unit to the volume of air pushed. The volume of air pushed is the product of the vibration area of ​​the speaker unit and the vibration amplitude. Referring to the above-mentioned gravity parameter Q comparison table of speakers of different brands, it can be clearly seen that the gravity parameter of the traditional speaker unit is very small, usually around 0.1 to 0.3 (unit: g / cubic centimeter, the same below). In the embodiment of the present application, a thicker metal sheet is used as the diaphragm, and the gravity parameter is greater than 0.5, or even 1 to 3. Under the same exhaust volume conditions, in order to keep the low-frequency cutoff frequency unchanged, the heavier the vibration mass, the greater the total elasticity can be, and the less air can be in the speaker box, thereby effectively reducing the volume of the subwoofer. Of course, the gravity parameter cannot be too large. It also has a limit. If it is too large, the resonance time will be too long and difficult to stop. Subjectively, the sound will be delayed, which will become unacceptable when it reaches a certain level.

[0086] It should be noted that the first speaker 2 of the present application forms an acoustic filter through resonance, filters out unwanted frequencies, and outputs required frequencies with high efficiency, thereby bringing purer sound quality to the subwoofer.

[0087] In the embodiment of the present application, the first speaker 2 can use a stainless steel sheet as the diaphragm, which can easily reach the required weight and occupy a very small volume, which can effectively reduce the thickness of the speaker unit. At the same time, since the metal itself is very hard, it can be made directly into a flat surface without being made into a cone, arc, etc., which reduces the volume of the speaker unit and indirectly reduces the volume of the sound box.

[0088] In order to solve the heat dissipation problem of the speaker, the voice coil frame of the first speaker 2 is directly connected to the metal sheet. The heat generated when the voice coil is working is transferred to the metal sheet. Since the metal sheet is relatively thick and 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 sheet. The advantage is 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] By changing the design of the speaker and cavity of the speaker, this case achieves the beneficial effects of reducing the volume of the speaker and extending the low-frequency limit of the speaker. The technical solution provided by this application can be used not only on the bass reflex speaker, but also on the traditional closed speaker, but the volume of the speaker is slightly larger.

[0090] Figure 2 A structural schematic diagram of a sound box is provided. The sound box includes a housing 1, a first cavity 102 and a second cavity 101 arranged inside the housing 1, a first speaker 3 is arranged inside the first cavity 102, a second speaker 2 is arranged inside the second cavity 101, and the first speaker 3 and the second speaker 2 both 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 folding ring 306. In addition, 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. The T-shaped iron 307 is fixedly installed in the first cavity 102 and the second cavity 101, the voice coil 302 is sleeved on the outside of the top end of the T-shaped iron 307, the magnet 301 is installed on the T-shaped iron 307 and is located on the outside of the upper end of the T-shaped iron 307, a basin is provided on the T-shaped iron 307, a centering support plate 303 is connected between the voice coil 302 and the basin, the top of the voice coil 302 is connected to the diaphragm 304, the folding ring 306 is connected between the top of the diaphragm 304 and the basin, and the dust cover 305 is arranged on the outside of the 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. The diaphragm 304 and the dust cover 305 of the first speaker 3 are both flat. The design of the flat diaphragm 304 and the dust cover 305 can make it easier to increase the weight of the diaphragm 304. Due to the heavy weight, the thickness is greatly increased, and the rigidity is also greatly increased. It is no longer necessary to make it into a conical, arc-shaped, sandwich structure to increase the strength, so that the volume of the second speaker 2 is reduced, and the volume of the sound box is further reduced.

[0092] The material of the diaphragm 304 of the first speaker 3 is metal. Stainless steel is preferred. When the diaphragm 304 made of stainless steel is used, 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 thickness of the stainless steel diaphragm 304 is relatively thick, the time for heat conduction is increased, and the problem of heat being difficult to dissipate in the speaker can also be solved.

[0093] The disclosure above provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0094] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0095] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A sound box, characterized in that: include: A housing having a first cavity and a second cavity; a first speaker, wherein the first speaker is disposed in the first cavity, and the first cavity is a resonant cavity; a second speaker, wherein the second speaker is disposed in the second cavity; The slowness parameter of the first speaker is greater than the slowness parameter of the second speaker, and the slowness parameter of the first speaker is greater than 3; Where R = (m*S S ) / D, R is the slowness parameter, m is the vibration mass of the speaker, S S is the compliance of the speaker, and D is the diameter of the speaker.

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 parts, plastic dust caps, diaphragm materials and other components in the first speaker are replaced with high-density materials such as metal stainless steel, and the diaphragm thickness of the first speaker is increased.

5. The speaker according to claim 1, characterized in that: The first speaker has a high-density metal voice coil frame, and the high-density metal voice coil frame is directly connected to the metal diaphragm of the first speaker to increase the weight and improve the heat conduction and heat dissipation effects.

6. The speaker according to claim 1, characterized in that: The shape of the diaphragm of the first speaker is changed from a cone shape, a dome shape, etc. to a flat structure to reduce the thickness of the first speaker.

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

8. The speaker according to claim 1, characterized in that: Includes passive radiators and amplitude limiting mechanisms; The housing is provided with an opening communicating with the first cavity, and the passive radiator is arranged in the opening; The amplitude limiting mechanism is arranged on the housing, and the amplitude limiting mechanism is located at the side of the passive radiator.

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

10. The speaker according to any one of claims 1 to 9, characterized in that: The weight rate parameter of the first speaker is greater than the weight rate parameter of the second speaker, and the weight rate parameter of the first speaker is greater than 1; Where Q = m / (S m *L), Q is the weight parameter, m is the vibration mass of the speaker, S m is the vibration area of ​​the loudspeaker, and L is the travel distance, which is one tenth of the diameter of the loudspeaker's vibration surface.

11. The speaker according to any one of claims 1 to 9, characterized in that: The speaker is used in a car; The first cavity of the sound box is located under the door of the car, and the second cavity of the sound box is located at the A-pillar of the car or a position close to the A-pillar of the car.

12. The speaker according to any one of claims 1 to 9, characterized in that: The number of the first cavities is one or more; The number of the second cavity is one or more.

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