Passive radiator and sound box

Abstract

The invention discloses a passive radiator and a sound box, and relates to the technical field of acoustics, the passive radiator comprises a diaphragm, a first damper, a second damper and a counterweight, the counterweight is connected with the first damper and the second damper, the distance between the first damper and the second damper is a first distance, and the distance between the second damper and the diaphragm is a second distance. The distance between the first damper or the second damper and the vibrating diaphragm is a second distance; the ratio of the first distance to the length of the diaphragm is greater than or equal to a first preset threshold value, and / or the ratio of the second distance to the length of the diaphragm is greater than or equal to a second preset threshold value; wherein the polarization frequencies corresponding to the first preset threshold value and the second preset threshold value are both greater than a preset resonant frequency, and the preset resonant frequency is the resonant frequency of a loudspeaker cooperatively working with the passive radiator. According to the invention, the polarization frequency of the passive radiator is increased, so that the phenomenon that the passive radiator is induced to be polarized while the resonance of the loudspeaker is avoided or reduced.

Description

Technical Field

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

[0002] A passive radiator is an acoustic component used in a speaker system that does not contain a drive circuit or voice coil and therefore does not require an external power source to operate. Currently, many sound-generating devices, such as speakers, are equipped with passive radiators to improve bass effects.

[0003] The working principle of a passive radiator is to use the movement of the active unit inside the sound box (i.e., the speaker unit with a voice coil) to drive the air inside the box, thereby causing the diaphragm of the passive radiator to vibrate and radiate sound. However, due to the overall physical properties of the passive radiator, the passive radiator may rotate to a certain extent while the piston vibrates, resulting in inconsistent amplitudes on the opposite sides of the diaphragm (referred to as polarization in this article). Usually, the polarization frequency of the passive radiator is close to the resonant frequency of the speaker in the sound box. At this time, due to the large excitation of the speaker, the polarization of the passive radiator may be induced while the speaker resonates, causing problems such as loss of sound quality and damage to the speaker. Summary of the invention

[0004] The main purpose of the present application is to provide a passive radiator and a sound box, aiming to solve the technical problem that the polarization frequency of the passive radiator is close to the resonance frequency of the speaker in the sound box, which causes the resonance of the speaker and induces the polarization of the passive radiator.

[0005] To achieve the above-mentioned purpose, the present application provides a passive radiator, the passive radiator comprising a diaphragm, a first spring wave, a second spring wave and a counterweight, the counterweight being connected to the first spring wave and the second spring wave respectively, the distance between the first spring wave and the second spring wave being a first distance, the distance between the first spring wave and the diaphragm or the distance between the second spring wave and the diaphragm being a second distance;

[0006] The ratio of the first distance to the length of the central part of the diaphragm is greater than or equal to a first preset threshold, and / or the ratio of the second distance to the length of the central part of the diaphragm is greater than or equal to a second preset threshold;

[0007] The polarization frequencies corresponding to the first preset threshold and the second preset threshold are both greater than a preset resonance frequency, and the preset resonance frequency is the resonance frequency of a loudspeaker working in cooperation with the passive radiator.

[0008] In one embodiment, the counterweight includes a first mass unit and a second mass unit, the first mass unit is connected to the first elastic wave, the second mass unit is connected to the second elastic wave, and the first mass unit and the second mass unit are symmetrically arranged along the center of the diaphragm.

[0009] In one embodiment, cross sections of the first mass unit and the second mass unit are both rectangular.

[0010] In one embodiment, the counterweight further includes a third mass unit and a fourth mass unit, the fourth mass unit is in contact with or connected to the diaphragm, the third mass unit connects the first mass unit and the fourth mass unit, and the third mass unit connects the second mass unit and the fourth mass unit.

[0011] In one embodiment, the fourth mass unit is disposed perpendicular to the diaphragm.

[0012] In one embodiment, a cross-sectional shape of the fourth mass unit is rectangular or hyperbolic.

[0013] In one embodiment, a cavity for placing a weight is formed in the middle of the diaphragm, and the weight is placed inside the cavity.

[0014] In one embodiment, the first preset threshold is 3 / 4, and / or the second preset threshold is 0.4.

[0015] In one embodiment, the length of the diaphragm is the maximum horizontal dimension of the central portion of the diaphragm.

[0016] In addition, to achieve the above-mentioned purpose, the present application also provides a sound box, which includes a speaker and the passive radiator as described above.

[0017] One or more technical solutions proposed in this application have at least the following technical effects:

[0018] The passive radiator includes a diaphragm, a first elastic wave, a second elastic wave and a weight, wherein the weight is connected to the first elastic wave and the second elastic wave respectively, the distance between the first elastic wave and the second elastic wave is a first distance, the distance between the first elastic wave and the diaphragm or the distance between the second elastic wave and the diaphragm is a second distance; the ratio between the first distance and the length of the central part of the diaphragm is greater than or equal to a first preset threshold, and / or the ratio between the second distance and the length of the central part of the diaphragm is greater than or equal to a second preset threshold; wherein the polarization frequencies corresponding to the first preset threshold and the second preset threshold are both greater than a preset resonant frequency, and the preset resonant frequency is the resonant frequency of the loudspeaker working in conjunction with the passive radiator. Considering that the polarization of the passive radiator is controlled by the moment of momentum theorem, that is, dL / dt=T, and L=Iω, M'=I=∫r1 2 dm,K′=∫r2 2 dk, Among them, L is the angular momentum of the passive radiator, T is the total torque acting on the passive radiator, t is time, dm is the mass of the counterweight of the microelement, r1 is the distance between the counterweight of the microelement and the rotation axis of the diaphragm, dk is the spring coefficient of the diaphragm or elastic wave of the microelement, r2 is the distance between the diaphragm or elastic wave of the microelement and the rotation axis of the diaphragm, fs' represents the polarization frequency. It can be obtained that when the mass distribution of the passive radiator is approximately unchanged, increasing the elastic moment of the passive diaphragm or elastic wave (that is, the distance between the diaphragm or elastic wave and the rotation axis of the diaphragm) can effectively increase the polarization frequency of the passive radiator while reducing the polarization amplitude. Based on this, in an embodiment of the present application, in the passive radiator, a ratio of a first distance between the first elastic wave and the second elastic wave to the length of the diaphragm is set to be greater than or equal to a first preset threshold, and / or a ratio of a second distance from the first elastic wave to the second elastic wave to the diaphragm to the length of the diaphragm is set to be greater than or equal to a second preset threshold, and the polarization frequencies corresponding to the first preset threshold and the second preset threshold are both greater than the resonant frequency of the speaker. In this way, when the first distance is greater than or equal to the first preset threshold and / or the second distance is greater than or equal to the second preset threshold, the elastic moment of the elastic wave is larger, thereby further increasing the polarization frequency of the passive radiator, so that the polarization frequency of the passive radiator is higher and away from the resonant frequency of the speaker in the sound box, thereby reducing or avoiding the phenomenon of inducing polarization of the passive radiator while the speaker resonates. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Figure 1 This is a schematic diagram of the use scenario of the passive radiator;

[0022] Figure 2 It is a schematic diagram of the structure of a traditional passive radiator;

[0023] Figure 3 This is a schematic diagram of the passive radiator structure involved in one embodiment of the present application;

[0024] Figure 4 This is another structural schematic diagram of a passive radiator involved in one embodiment of the present application;

[0025] Figure 5 It is a top view of a passive radiator involved in one embodiment of the present application. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In addition, the descriptions involving "first", "second", etc. in this application are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0029] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0030] Reference Figure 1 As shown, passive radiators are usually used with speakers such as woofers, see Figure 2 As shown, the passive radiator is usually composed of a diaphragm 10 (also called a passive diaphragm), a first spring wave 201, a second spring wave 202, and a weight 30 (also called a mass block). Generally speaking, the resonance frequency of the passive radiator is lower than the resonance frequency of the woofer, and the polarization frequency of the passive radiator is equivalent to the resonance frequency. When the polarization frequency of the passive radiator is close to the resonance frequency of the woofer, the polarization of the passive radiator may be induced due to the large excitation of the woofer, resulting in sound quality loss and reliability problems.

[0031] Since passive radiators are usually used with woofers, and generally speaking, the resonant frequency of passive radiators is lower than the resonant frequency of woofers, and the frequency of the polarization mode of passive radiators (also called polarization frequency) is higher than the resonant frequency of the piston motion of passive radiators, the polarization frequency of passive radiators usually appears near the resonant frequency of woofers. When the speaker system works near the resonant frequency of the woofer, the volume velocity provided by the woofer reaches a maximum, and the passive radiator is driven to work with a large and unbalanced excitation, which will induce the polarization mode of the passive radiator, causing sound quality loss and reliability problems.

[0032] Based on this, the main solution of the present application is: the passive radiator includes a diaphragm, a first elastic wave, a second elastic wave and a counterweight, the counterweight is respectively connected to the first elastic wave and the second elastic wave, the distance between the first elastic wave and the second elastic wave is a first distance, the distance between the first elastic wave and the diaphragm or the distance between the second elastic wave and the diaphragm is a second distance; the ratio of the first distance to the length of the center part of the diaphragm is greater than or equal to a first preset threshold, and / or the ratio of the second distance to the length of the center part of the diaphragm is greater than or equal to a second preset threshold; wherein the polarization frequencies corresponding to the first preset threshold and the second preset threshold are both greater than a preset resonance frequency, and the preset resonance frequency is the resonance frequency of the speaker working in conjunction with the passive radiator.

[0033] The present application sets a ratio between a first distance between a first elastic wave and a second elastic wave and the length of a diaphragm in a passive radiator that is greater than or equal to a first preset threshold, and / or sets a ratio between a second distance from the first elastic wave to the second elastic wave to the diaphragm and the length of the diaphragm that is greater than or equal to a second preset threshold, and the polarization frequencies corresponding to the first preset threshold and the second preset threshold are both greater than the resonant frequency of the loudspeaker. In this way, when the first distance is greater than or equal to the first preset threshold and / or the second distance is greater than or equal to the second preset threshold, the elastic moment of the elastic wave is larger, thereby further increasing the polarization frequency of the passive radiator, so that the polarization frequency of the passive radiator is higher and away from the resonant frequency of the loudspeaker in the sound box, thereby reducing or avoiding the phenomenon of inducing polarization of the passive radiator while the loudspeaker resonates.

[0034] Based on this, the present application proposes a first embodiment of a passive radiator, referring to Figure 3 to Figure 4 As shown, the passive radiator includes a diaphragm 10, a first spring wave 201, a second spring wave 202 and a weight 30. The weight 30 is connected to the first spring wave 201 and the second spring wave 202 respectively. The distance between the first spring wave 201 and the second spring wave 202 is a first distance. The distance between the first spring wave 201 or the second spring wave 202 and the diaphragm 10 is a second distance.

[0035] The passive radiator can be applied to sound-generating equipment, such as a speaker. As an important component of low-frequency sound effects in sound-generating equipment, it is similar to the vibration system of a loudspeaker, but does not have a magnetic circuit system. It usually relies on the vibration of the loudspeaker in the sound-generating equipment to be forced to vibrate and produce sound.

[0036] It should be noted that the weight 30 and the diaphragm 10 may be connected but not in contact (connected through an intermediary, such as snap-on), or may be in contact but not in contact (such as attached to the diaphragm surface through a magnetic component), or may be in contact and connected (such as adhesively bonded), and this embodiment does not impose any specific restrictions on this. The contact surface refers to the surface where the weight 30 contacts the diaphragm 10, and the connection surface specifically refers to the surface where the weight 30 is parallel to the surface of the diaphragm 10.

[0037] The diaphragm 10 is used to vibrate in response to air pressure to enhance the low-frequency performance of the speaker. The cross-sectional shape of the diaphragm 10 may be, but is not limited to, square, rectangular, circular, and elliptical.

[0038] Reference Figure 3 As shown, the first distance a1 between the first spring wave 201 and the second spring wave 202 may specifically be the spacing distance between the first spring wave 201 and the second spring wave 202 .

[0039] The second distance may be the distance from the first elastic wave 201 to the diaphragm 10, or the distance from the second elastic wave 202 to the diaphragm 10. When the first elastic wave 201 and the second elastic wave 202 are symmetrically distributed along the center of the diaphragm 10, the distance from the first elastic wave 201 to the diaphragm 10 is equal to the distance from the second elastic wave 202 to the diaphragm 10. When the distances from the first elastic wave 201 and the second elastic wave 202 to the diaphragm 10 are different, the second distance is preferably the minimum value of the distance from the first elastic wave 201 to the diaphragm 10 and the distance from the second elastic wave 202 to the diaphragm 10. Exemplarily, the second distance is the distance from the first elastic wave 201 to the diaphragm 10 for the description and explanation of the various embodiments of the present application.

[0040] The distance from the first elastic wave 201 to the diaphragm 10 may specifically be the distance between the first elastic wave 201 and any two points on the diaphragm 10 that are relatively arranged. Figure 4 As shown, the second distance is the shortest distance between the first elastic wave 201 and the diaphragm 10 .

[0041] The diaphragm can usually be divided into two main parts: the edge part (also called the periphery or surround) and the center part (or dome area). The edge part refers to the area where the diaphragm is connected to the frame, which is usually made of a soft and elastic material so that the diaphragm can move freely when vibrating. The center part is the central area of ​​the diaphragm, which is usually harder and thinner than the edge part to provide better high-frequency response and reduce distortion. Based on this, refer to Figure 3 to Figure 4 As shown, the length b of the central portion of the diaphragm 10 is the maximum horizontal dimension of the central portion of the diaphragm 10 .

[0042] The ratio of the first distance to the length of the central part of the diaphragm 10 is greater than or equal to a first preset threshold, and / or the ratio of the second distance to the length of the central part of the diaphragm 10 is greater than or equal to a second preset threshold; wherein the polarization frequencies corresponding to the first preset threshold and the second preset threshold are both greater than a preset resonance frequency, and the preset resonance frequency is the resonance frequency of a speaker working in conjunction with the passive radiator.

[0043] The polarization frequency corresponding to the first preset threshold refers to the polarization frequency of the passive radiator when the ratio between the first distance in the passive radiator and the length of the central part of the diaphragm 10 is the first preset threshold; similarly, the polarization frequency corresponding to the second preset threshold refers to the polarization frequency of the passive radiator when the ratio between the second distance in the passive radiator and the length of the central part of the diaphragm 10 is the second preset threshold.

[0044] The resonant frequency of a speaker, also called the resonance frequency or natural frequency, refers to the frequency at which the speaker system (including the diaphragm, voice coil, suspension system, etc.) naturally vibrates without an external driving force due to its own physical properties (such as mass, elasticity, damping, etc.). At this frequency point, the speaker system can most effectively convert electrical signals into sound waves and can theoretically produce the maximum sound pressure level.

[0045] It should be noted that the polarization frequency can be specifically the frequency at which the passive radiator generates a polarization mode, or the frequency at which the average polarization amplitude of the passive radiator is greater than a preset threshold value, and the polarization amplitude can be specifically the absolute value difference between the amplitude at each position on the diaphragm and the average amplitude, and the average amplitude is the average value of the amplitude at each point on the diaphragm. Relevant personnel can set the preset threshold value based on actual needs. For example, when the sound quality requirement is high, a smaller value can be set, and when the sound quality requirement is low, a larger value can be set. This embodiment does not impose specific restrictions on this.

[0046] The loudspeaker that works in conjunction with the passive radiator may specifically be a loudspeaker with which the passive radiator vibrates synchronously.

[0047] The ratio between the first distance and the length of the central part of the diaphragm 10 can be specifically the first distance divided by the length of the central part of the diaphragm 10, or the length of the central part of the diaphragm 10 divided by the first distance. Similarly, the ratio between the second distance and the length of the central part of the diaphragm 10 can be specifically the second distance divided by the length of the central part of the diaphragm 10, or the length of the central part of the diaphragm 10 divided by the second distance.

[0048] When the ratio of the first distance to the length of the central portion of the diaphragm 10 is the first distance divided by the length of the central portion of the diaphragm 10 , in a preferred embodiment, the first preset threshold is 3 / 4.

[0049] The ratio of the second distance to the length of the central part of the diaphragm 10 is the second distance divided by the length of the central part of the diaphragm 10. In a preferred embodiment, the second preset threshold is 0.4.

[0050] In this embodiment, a passive radiator is provided including a diaphragm, a first elastic wave, a second elastic wave and a weight, the weight being connected to the first elastic wave and the second elastic wave respectively, the distance between the first elastic wave and the second elastic wave being a first distance, the distance between the first elastic wave and the diaphragm or the distance between the second elastic wave and the diaphragm being a second distance; the ratio between the first distance and the length of the central part of the diaphragm being greater than or equal to a first preset threshold, and / or the ratio between the second distance and the length of the central part of the diaphragm being greater than or equal to a second preset threshold; wherein the polarization frequencies corresponding to the first preset threshold and the second preset threshold are both greater than a preset resonant frequency, and the preset resonant frequency is the resonant frequency of the loudspeaker working in conjunction with the passive radiator. Considering that the polarization of the passive radiator is controlled by the moment of momentum theorem, that is, dL / dt=T, and L=Iω, M'=I=∫r1 2 dm,K′=∫r2 2 dk, Among them, L is the angular momentum of the passive radiator, T is the total torque acting on the passive radiator, t is time, dm is the mass of the counterweight of the microelement, r1 is the distance between the counterweight of the microelement and the rotation axis of the diaphragm, dk is the spring coefficient of the diaphragm or elastic wave of the microelement, r2 is the distance between the diaphragm or elastic wave of the microelement and the rotation axis of the diaphragm, fs' represents the polarization frequency. It can be obtained that when the mass distribution of the passive radiator is approximately unchanged, increasing the elastic moment of the passive diaphragm or elastic wave (that is, the distance between the diaphragm or elastic wave and the rotation axis of the diaphragm) can effectively increase the polarization frequency of the passive radiator while reducing the polarization amplitude. Based on this, in this embodiment, in the passive radiator, the ratio of the first distance between the first elastic wave and the second elastic wave to the length of the diaphragm is set to be greater than or equal to the first preset threshold, and / or the ratio of the second distance from the first elastic wave to the second elastic wave to the diaphragm to the length of the diaphragm is set to be greater than or equal to the second preset threshold, and the polarization frequencies corresponding to the first preset threshold and the second preset threshold are both greater than the resonant frequency of the speaker. In this way, when the first distance is greater than or equal to the first preset threshold and / or the second distance is greater than or equal to the second preset threshold, the elastic moment of the elastic wave is larger, thereby further increasing the polarization frequency of the passive radiator, so that the polarization frequency of the passive radiator is higher and far away from the resonant frequency of the speaker in the sound box, thereby reducing or avoiding the phenomenon of inducing polarization of the passive radiator while the speaker resonates.

[0051] Further, based on the first embodiment of the passive radiator, a second embodiment of the passive radiator is proposed. In the second embodiment of the passive radiator, the same or similar contents as those in the first embodiment can be referred to the above description and will not be described in detail later. On this basis, the counterweight includes a first mass unit and a second mass unit, the first mass unit is connected to the first elastic wave, the second mass unit is connected to the second elastic wave, and the first mass unit and the second mass unit are symmetrically arranged along the center of the diaphragm.

[0052] Based on this, by setting the ratio of the first distance to the length of the central part of the diaphragm 10 to be greater than or equal to the first preset threshold, and by setting the ratio of the second distance to the length of the central part of the diaphragm 10 to be greater than or equal to the second preset threshold, the distance between the first elastic wave 201 and the second elastic wave 202 and the rotation axis of the diaphragm 10 can be reduced, and the distance between the first elastic wave 201 and the second elastic wave 202 and the rotation axis of the diaphragm 10 can be reduced, so that the polarization frequency of the diaphragm can be increased, so as to reduce or avoid the phenomenon that the diaphragm is induced to generate polarization when the diaphragm 10 vibrates and the speaker resonates.

[0053] The rotation axis of the diaphragm refers to two straight lines that pass through the geometric center of the passive radiator and are parallel to the long and short sides of the diaphragm respectively. When vibrating, the diaphragm rotates periodically around this axis.

[0054] When the speaker is working, the electrical signal generates a magnetic field through the voice coil, which interacts with the magnetic field generated by the permanent magnet, causing the voice coil and the connected diaphragm to vibrate. This vibration is usually a complex three-dimensional movement, including forward and backward piston vibration along the vibration direction and circular vibration along the two diaphragm rotation axes. This vibration of the diaphragm pushes the air to generate sound waves, thereby producing sound.

[0055] In a preferred embodiment, the ratio of the first distance to the length of the central part of the diaphragm 10 is greater than or equal to a first preset threshold and the ratio of the second distance to the length of the central part of the diaphragm 10 is greater than or equal to a second preset threshold, so as to minimize or reduce the phenomenon that the resonance of the speaker induces polarization of the passive radiator.

[0056] In a possible implementation manner, cross sections of the first mass unit and the second mass unit are both rectangular.

[0057] The first mass unit at least includes a portion of the weight object 30 that contacts the first elastic wave 201 , and the second mass unit at least includes a portion of the weight object 30 that contacts or connects to the second elastic wave 202 .

[0058] Reference Figure 3 to Figure 4As shown, the cross-sections of the first mass unit and the second mass unit are both rectangular, and specifically, the cross-sections of the first mass unit and the second mass unit are both rectangular along the vibration direction of the diaphragm 10. The vibration direction of the diaphragm refers to a straight line passing through the geometric center of the passive radiator and perpendicular to the diaphragm, and the diaphragm performs periodic reciprocating piston vibration along this direction when vibrating.

[0059] In a possible implementation, the counterweight further includes a third mass unit and a fourth mass unit, the fourth mass unit is in contact with or connected to the diaphragm, the third mass unit connects the first mass unit and the fourth mass unit, and the third mass unit connects the second mass unit and the fourth mass unit.

[0060] The fourth mass unit and the diaphragm 10 may be only connected but not in contact (connected through an intermediary, such as snap-on), or only in contact but not connected (such as attached to the diaphragm surface through a magnetic component), or both in contact and connected (such as bonding), and this embodiment does not impose any specific restrictions on this.

[0061] The fourth mass unit at least includes the portion of the weight 30 that contacts or connects to the diaphragm 10 . The third mass unit connects the first mass unit, the second mass unit and the fourth mass unit. The fourth mass unit contacts neither the diaphragm 10 nor the first and second elastic waves 201 and 202 .

[0062] In a possible implementation manner, the fourth mass unit is arranged perpendicular to the diaphragm.

[0063] The fourth mass unit is arranged at the center position of the diaphragm 10, so that the counterweight is concentrated near the rotation axis of the diaphragm, which can reduce the distance between the fourth mass unit and the rotation axis of the diaphragm 10. In this way, the distance between the counterweight and the rotation axis of the diaphragm can be shortened, thereby reducing the rotational inertia of the passive radiator and further increasing the polarization frequency of the passive radiator.

[0064] In a possible implementation manner, a cross-sectional shape of the fourth mass unit is rectangular or hyperbolic.

[0065] It should be noted that the cross section of the fourth mass unit is rectangular or hyperbolic, and specifically, the cross section along the vibration direction of the diaphragm 10 is rectangular or hyperbolic. Further, the rectangle in this embodiment includes a rectangle with an arc portion, such as a rectangle with four corner points being arcs.

[0066] Furthermore, the cross-section of the fourth mass unit includes but is not limited to a rectangle and a hyperbola, and relevant personnel can also design the fourth mass unit in other shapes.

[0067] Further, based on the first and second embodiments of the passive radiator, a third embodiment of the passive radiator is proposed. In the third embodiment of the passive radiator, the same or similar contents as those of the first and second embodiments can be referred to the above introduction and will not be described in detail later. On this basis, a cavity for placing a counterweight is formed in the middle position of the diaphragm, and the counterweight is placed inside the cavity.

[0068] The diaphragm 10 may include a diaphragm body and a fixing portion arranged around the diaphragm surface and extending toward the center of the diaphragm, so that the fixing portion and the diaphragm body may form a receiving space (i.e., a chamber), and the weight is arranged in the receiving space. The weight is placed inside the receiving space, so that the vibration area involved in the sound generation is significantly increased, and the vibration structure is also significantly stronger.

[0069] Furthermore, the connection part is an elastic connection part, and the fixing part, the diaphragm body and the elastic connection part can be an integrally formed rubber part to ensure that the weight 30 can be well fixed at the set position on the diaphragm 10 without loosening, etc., thereby ensuring the vibration consistency of the weight 30 and the diaphragm 10. The weight 30 can preferably be a metal weight.

[0070] Furthermore, the mass of the counterweight 30 is adjustable. For example, the counterweight 30 can be implemented by inserting multiple nuts on a screw rod. When the mass of the counterweight needs to be increased, a few more nuts are inserted on the screw rod; and when the mass of the counterweight needs to be reduced, a few nuts can be removed. The mass of the counterweight 30 can be flexibly changed. If the mass of the counterweight 30 increases, the vibration speed of the diaphragm 10 will slow down, thereby reducing the operating frequency of the passive radiator accordingly. Conversely, if the mass of the counterweight 30 decreases, the vibration speed of the diaphragm 10 will increase, thereby increasing the operating frequency of the passive radiator accordingly. In this way, the operating frequency of the passive radiator can be flexibly changed.

[0071] In a possible implementation manner, the first elastic wave 201 and the second elastic wave 202 are both folded and extended back and forth to form a spring shape with alternating crests and troughs.

[0072] Reference Figures 2 to 4 As shown, the first damper 201 and the second damper 202 are both folded and extended back and forth in a direction perpendicular to the rotation axis of the diaphragm 10, and are in a spring shape with alternating crests and troughs. When vibrating, the first damper 201 and the second damper 202 are displaced under the action of an external force. Since the first damper 201 and the second damper 202 are in a spring shape, the contact surface of the supporting point is small compared to the traditional circular damper, and the resistance of the first damper 201 and the second damper 202 becomes smaller, so that the voice coil can obtain the maximum stroke with the minimum power.

[0073] Furthermore, the first elastic wave 201 and the second elastic wave 202 can be molded plastic elastic wave bodies, and the materials of the first elastic wave 201 and the second elastic wave 202 can be paper, cloth, rubber, chemical fiber, hardware and other moldable materials. This embodiment does not make specific restrictions on this.

[0074] In a possible implementation manner, the number of the first spring waves 201 and the second spring waves 202 is at least two, and they are evenly distributed along the center of the diaphragm 10 .

[0075] For example, refer to Figure 5 As shown, Figure 5 2 is a top view of a passive radiator. The number of the first spring waves 201 and the number of the second spring waves 202 are both two and are evenly distributed along the center of the diaphragm 10 .

[0076] Generally speaking, the number of the first wave damper 201 and the number of the second wave damper 202 are both one. The number of the first wave damper 201 and the second wave damper 202 can be selected according to the actual structure of the passive radiator, so as to be applicable to passive radiators with different structures.

[0077] Furthermore, when there are multiple first elastic waves 201 and / or multiple second elastic waves 202, the distance between two adjacent first elastic waves 201 or the distance between two adjacent second elastic waves 202 is determined to be a third distance, and the ratio of the third distance to the width of the central part of the diaphragm 10 is greater than or equal to a third preset threshold.

[0078] Similar to the first preset threshold and the second preset threshold, the polarization frequency corresponding to the third preset threshold is greater than the preset resonance frequency, and the preset resonance frequency is the resonance frequency of the speaker working in cooperation with the passive radiator.

[0079] The ratio between the third distance and the width of the central portion of the diaphragm 10 may specifically be the third distance divided by the width of the central portion of the diaphragm 10 , or the width of the central portion of the diaphragm 10 divided by the third distance.

[0080] When the ratio of the third distance to the width of the central portion of the diaphragm 10 is the third distance divided by the width of the central portion of the diaphragm 10 , in a preferred embodiment, the third preset threshold is 3 / 4.

[0081] Furthermore, the width b of the central portion of the diaphragm 10 is the maximum vertical dimension of the central portion of the diaphragm 10 .

[0082] In addition, a damping member may be provided on the surface of the diaphragm 10. The damping member is made of an elastic material, such as rubber or silicone, and has a relatively high density to increase the overall mass of the diaphragm 10. The damping member may be a plane or a curved surface, in a block or strip shape, and is not limited here. It only needs to be symmetrically arranged relative to the center of the diaphragm 10, that is, the damping member is rotated 180 degrees with the center of the diaphragm 10 as the origin so that it coincides with the original shape, so that the diaphragm 10 will not vibrate in a direction that deviates from its axis, that is, there will be no distortion such as flipping to one side, thereby improving the sound effect. The connection method between the damping member and the diaphragm 10 is also not limited, and may be bonding, etc.

[0083] Furthermore, to achieve the above objectives, the present application also provides a sound box, which includes a speaker and the passive radiator described in any of the above embodiments.

[0084] The speaker (also called an active speaker to contrast the meaning of "passive" in a passive radiator) may be a speaker unit, including but not limited to a woofer, and this embodiment does not impose any specific limitation on this.

[0085] The speaker unit is a basic sound-generating unit, which is used to convert an electrical signal into an acoustic signal. Specifically, the speaker unit can be a dynamic unit or a moving iron unit. For ease of explanation, a dynamic unit is taken as an example in this embodiment. The dynamic unit includes a vibration component and a magnetic circuit component. The vibration component includes a diaphragm and a voice coil, and the diaphragm is fixedly connected to the voice coil. The magnetic circuit component system includes a magnetic yoke and a center magnet and a side magnet arranged on the surface of one side of the magnetic yoke. A magnetic gap is formed between the center magnet and the side magnet, and one end of the voice coil is inserted into the magnetic gap. When the voice coil is energized, the voice coil will vibrate under the action of the magnetic circuit system. At the same time, the voice coil drives the diaphragm to vibrate together to achieve the sound of the diaphragm. For example, in a specific embodiment, the speaker unit includes a diaphragm, a voice coil, a magnetic circuit system, a support system and a frame. Among them, the diaphragm, also known as the sound basin, is the part of the speaker unit that is directly responsible for vibrating and pushing the air to generate sound waves; the voice coil is located behind the diaphragm, and is a coil. When the audio electrical signal passes through it, a magnetic field is generated. The voice coil moves in the magnetic field, driving the diaphragm to vibrate; the magnetic circuit system includes permanent magnets and magnetic conductive plates (magnetic yokes) for generating magnetic fields; the support system includes folding rings and spiders for supporting the diaphragm and limiting its vibration range, while ensuring that the diaphragm can vibrate freely; the frame, also known as the basin frame, is used to fix the diaphragm, voice coil and support system, and is usually also used to connect the speaker unit to an external circuit.

[0086] The speaker box also includes a shell. An active speaker notch and a passive radiator notch are provided on the surface of the shell; the active speaker is provided in the active speaker notch of the shell, and is used to emit medium and high frequency sounds through electroacoustic conversion; the passive radiator is provided in the passive radiator notch of the shell, and is used to emit low frequency sounds by responding to air pressure, and the active speaker and the passive radiator are not in contact.

[0087] Furthermore, the active speaker can be placed at the installation position at the center of the bottom of the shell, and the passive radiator can be placed at the installation position at the center of the top of the shell, and the center points of the two are on the same vertical line. The working method is: when the active speaker vibrates and does work, it will push the air flow in the shell to move, and the direction of movement of the air flow is directly upward toward the position of the passive radiator.

[0088] Furthermore, a plurality of air guide components are provided near the location of the passive radiator, so as to form a guide structure for the air flow when it flows upward; in one embodiment, the air guide component implemented preferably adopts an arc-shaped air guide tube connected to the shell wall portion, and the lower end of the air guide tube is directly fixedly connected to the shell wall portion. The connection method can adopt the technical means commonly used in the prior art, such as bonding, clamping, etc., and each air guide tube forms a contact surface for the air flow on the side facing the active speaker, so that the non-central air flow around the active speaker is guided to the direction of the passive radiator along the contact surface formed by the air guide tube when moving upward, so that these non-central air flows and the central air flow directly act on the passive radiator together, which changes the previous movement of the air flow in a scattered state, so that the passive radiator is pushed by the majority of the guiding air flow to make a sound, which is beneficial to maximizing its working performance, can effectively utilize the speaker to do work, and also improves the working performance.

[0089] Furthermore, the implemented air guide tubes are distributed around the upper part of the shell, the lower end of each tube is connected to the shell wall, and the upper end of each tube is designed to be non-contact with the passive radiator, and a certain gap is left between each upper end and the passive radiator. In fact, these air guide tubes are distributed in an array inside the box. If the shell is a regular cylindrical structure, the air guide tubes are distributed in a ring array inside the shell;

[0090] Furthermore, the contact surface of the air guide tube for air flow facing the active speaker is preferably set as an arc-shaped surface, and the arc-shaped surface is upwardly tilted from the connection with the shell wall toward the location of the passive radiator to facilitate the guidance and convergence of the surrounding non-central air flow.

[0091] Furthermore, if the speaker is a cylindrical structure, technicians may also consider using the air guide tube implemented in Example 1 or implementing guide strips of other shapes during the specific implementation. In the area where the guide tube is implemented, every two adjacent rectangular guide tubes are tightly fitted or separated by a certain gap, which can also achieve a certain guiding effect.

[0092] Furthermore, if the speaker is a non-cylindrical structure, such as a rectangular structure, the technicians may also consider implementing rectangular guide pipes with a rectangular cross-section during the specific implementation. In the area where the guide pipes are implemented, every two adjacent rectangular guide pipes are close together, which can also achieve the guiding effect of local air flow. Of course, the specific arrangement and installation method of the guide pipes are related to the shape of the speaker and need to be assembled in combination with actual production.

[0093] Furthermore, if the speaker is a non-cylindrical structure, such as a rectangular parallelepiped speaker, technicians may also consider implementing rectangular guide tubes with a rectangular cross-section during the specific implementation. In the area where the guide tubes are implemented, there is a certain gap between every two adjacent rectangular guide tubes, which can also achieve a certain guiding effect.

[0094] In a preferred embodiment, when the speaker is in use, the active speaker is fed with an electrical signal, causing the diaphragm to vibrate, and emitting medium and high frequency sounds through electroacoustic conversion. At the same time, when the active speaker is working, it compresses the air in the shell of the speaker, converts the heat energy and kinetic energy generated by the electroacoustic conversion into sound energy through the diaphragm of the passive radiator on the shell, and emits low frequency sounds.

[0095] In addition, the speaker may also include a processing device (such as a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) or a program loaded from a storage device into a random access memory (RAM). In the RAM, various programs and data required for the operation of the passive radiator are also stored. The processing device, ROM, and RAM are connected to each other through a bus. The input / output (I / O) interface is also connected to the bus. Generally, the following systems can be connected to the I / O interface: input devices such as touch screens, touch pads, image sensors, microphones, accelerometers, gyroscopes, etc.; output devices such as liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices such as tapes, hard disks, etc.; and communication devices. The communication device can allow the passive radiator to communicate wirelessly or wired with other devices to exchange data. Although the above shows a speaker with various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems may be implemented or have alternatively.

[0096] The speaker provided in the embodiment of the present application can solve the technical problem that the polarization frequency of the passive radiator is close to the resonance frequency of the speaker in the speaker box, which causes the resonance of the speaker and induces the polarization of the passive radiator. Compared with the prior art, the beneficial effects of the speaker provided in the present application are the same as the beneficial effects of the passive radiator provided in the above embodiment, and the other technical features of the passive radiator are the same as those disclosed in the previous embodiment, which will not be repeated here.

[0097] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0098] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0099] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0100] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0101] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software sensor, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, including a number of instructions for a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0102] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A passive radiator, characterized in that: The passive radiator includes a diaphragm, a first spring wave, a second spring wave and a weight, wherein the weight is connected to the first spring wave and the second spring wave respectively, the distance between the first spring wave and the second spring wave is a first distance, and the distance between the first spring wave and the diaphragm or the distance between the second spring wave and the diaphragm is a second distance; The ratio of the first distance to the length of the central part of the diaphragm is greater than or equal to a first preset threshold, and / or the ratio of the second distance to the length of the central part of the diaphragm is greater than or equal to a second preset threshold; The polarization frequencies corresponding to the first preset threshold and the second preset threshold are both greater than a preset resonance frequency, and the preset resonance frequency is the resonance frequency of a loudspeaker working in cooperation with the passive radiator.

2. The passive radiator according to claim 1, characterized in that The counterweight includes a first mass unit and a second mass unit, the first mass unit is connected to the first elastic wave, the second mass unit is connected to the second elastic wave, and the first mass unit and the second mass unit are symmetrically arranged along the center of the diaphragm.

3. The passive radiator according to claim 2, characterized in that The cross sections of the first mass unit and the second mass unit are both rectangular.

4. The passive radiator according to claim 2, characterized in that The counterweight further includes a third mass unit and a fourth mass unit, the fourth mass unit is in contact with or connected to the diaphragm, the third mass unit connects the first mass unit and the fourth mass unit, and the third mass unit connects the second mass unit and the fourth mass unit.

5. The passive radiator according to claim 4, characterized in that The fourth mass unit is arranged perpendicular to the diaphragm.

6. The passive radiator according to claim 5, characterized in that The cross-sectional shape of the fourth mass unit is rectangular or hyperbolic.

7. The passive radiator according to any one of claims 1 to 6, characterized in that: A cavity for placing a weight is formed in the middle of the diaphragm, and the weight is placed inside the cavity.

8. The passive radiator according to any one of claims 1 to 6, characterized in that: The first preset threshold is 3 / 4.

9. The passive radiator according to any one of claims 1 to 6, characterized in that: The second preset threshold is 0.

4.

10. A sound box, characterized in that: The sound box comprises a speaker and a passive radiator as claimed in any one of claims 1 to 9.

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