Loudspeaker module

Abstract

The invention discloses a loudspeaker module, and relates to the technical field of acoustic-electric conversion, and the loudspeaker module comprises a loudspeaker single body, a housing, and a front sound cavity formed by a sound outlet hole formed in the housing. The shell comprises a retaining wall opposite to the sound outlet hole, and the loudspeaker single body comprises a vibrating diaphragm; the ratio of the distance between the vibrating diaphragm and the retaining wall to the width of the front sound cavity belongs to a preset cancellation range; wherein the preset cancellation range comprises a target value, the cavity resonance frequency corresponding to the target value is the same as the destructive interference frequency, the cavity resonance frequency is the frequency at which the loudspeaker module generates a cavity resonance phenomenon, and the destructive interference frequency is the frequency at which the loudspeaker module generates a destructive interference phenomenon. According to the invention, the smoothness of the frequency response curve of the loudspeaker module is improved.

Description

Technical Field

[0001] The present application relates to the technical field of sound-to-electricity conversion, and in particular to a speaker module. Background Art

[0002] With the progress of society and the rapid development of science and technology, portable electronic products have gradually emerged and are popular for their convenience, comprehensive functions, and ability to meet people's needs for Internet access, communication, and entertainment, such as mobile phones and iPads (tablet computers). As an important acoustic component in portable electronic products, speaker modules are widely in demand. As people's requirements for portable electronic products increase, the acoustic performance of speaker modules is also attracting more and more attention.

[0003] The frequency response of a speaker is expected to be a straight curve to achieve a balanced audio experience. However, in existing speakers, especially for side-emitting speaker modules, cavity resonance and destructive interference are inevitable. Cavity resonance usually appears as a peak on the frequency response curve, while destructive interference usually appears as a valley on the frequency response curve, which will cause a series of valleys and peaks in the frequency response of the speaker module, and the smoothness of the frequency response curve is low.

[0004] Therefore, how to improve the smoothness of the frequency response curve of the speaker module is a technical problem that needs to be solved urgently in the technical field.

[0005] Application Contents

[0006] The main purpose of the present application is to provide a speaker module, method and readable storage medium, aiming to solve the technical problem of how to improve the smoothness of the frequency response curve of the speaker module.

[0007] To achieve the above-mentioned object, the present application provides a speaker module, the speaker module comprising a speaker unit, a shell, and a front sound cavity formed by a sound outlet hole opened on the shell;

[0008] The housing includes a baffle wall arranged opposite to the sound outlet, and the speaker unit includes a diaphragm;

[0009] The ratio of the distance between the diaphragm and the baffle wall to the width of the front acoustic cavity falls within a preset cancellation range;

[0010] Among them, the preset cancellation range includes a target value, the cavity resonance frequency corresponding to the target value is the same as the destructive interference frequency, the cavity resonance frequency is the frequency at which the speaker module produces the cavity resonance phenomenon, and the destructive interference frequency is the frequency at which the speaker module produces the destructive interference phenomenon.

[0011] In one embodiment, the target value is 4.

[0012] In one embodiment, the preset cancellation range is 3.2 to 4.8.

[0013] In one embodiment, the housing includes a module upper shell and a module lower shell, and the speaker unit is disposed in a cavity formed by the module upper shell and the module lower shell.

[0014] In one embodiment, the module upper shell is a bottomless cavity formed by four side walls and a top wall, a sound outlet hole is provided on one side wall, and the side wall opposite to the side wall with the sound outlet hole is a retaining wall.

[0015] In one embodiment, the width of the front sound cavity is the distance between two target side walls in the module upper shell, wherein the target side walls are two side walls of the four side walls of the module upper shell that are oppositely arranged and neither of which has a sound outlet hole.

[0016] In one embodiment, the shell further includes a module middle shell, and slots are provided at the bottom and top of the module middle shell, the module lower shell is snapped onto the bottom of the module middle shell through the slots, and the module upper shell is snapped onto the top of the module middle shell through the slots.

[0017] In one embodiment, the joint positions of the module upper shell and the module middle shell, and the joint positions of the module lower shell and the module middle shell are sealed by ultrasonic welding, gluing or crimping.

[0018] In one embodiment, the cross-section of the front acoustic cavity is rectangular, trapezoidal, elliptical or semi-racetrack.

[0019] In one embodiment, the speaker module is a side-sound speaker module.

[0020] One or more technical solutions proposed in this application have at least the following technical effects:

[0021] The speaker module includes a speaker unit, a shell, and a front sound cavity formed by a sound outlet hole opened on the shell; the shell includes a baffle wall arranged opposite to the sound outlet hole, and the speaker unit includes a diaphragm; the ratio between the distance from the diaphragm to the baffle wall and the width of the front sound cavity belongs to a preset cancellation range; wherein the preset cancellation range includes a target value, the cavity resonance frequency corresponding to the target value is the same as the destructive interference frequency, the cavity resonance frequency is the frequency at which the speaker module generates a cavity resonance phenomenon, and the destructive interference frequency is the frequency at which the speaker module generates a destructive interference phenomenon. In this way, in the embodiment of the present application, a preset cancellation range including a target value is set, and when the ratio between the distance from the diaphragm to the baffle wall and the width of the front sound cavity is the target value, the speaker module generates a cavity resonance phenomenon and a destructive interference phenomenon at the same frequency. That is, it can be understood that, within the preset cancellation range, the frequency at which the speaker module produces cavity resonance is consistent with or close to the frequency at which it produces destructive interference, so that the speaker module frequency response produces valleys and peaks at similar or identical frequencies. This can weaken or eliminate the valleys and peaks of the frequency response curve, thereby setting the ratio of the distance from the diaphragm to the baffle wall to the width of the front sound cavity within this preset cancellation range, thereby improving the smoothness of the speaker module frequency response curve. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or 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.

[0024] Figure 1 This is a schematic cross-sectional view of the structure of the speaker module of the present application;

[0025] Figure 2 A top view of a speaker module according to an embodiment of the present application;

[0026] Figure 3 A front view of a speaker module according to an embodiment of the present application;

[0027] Figure 4 A side view of a speaker module according to an embodiment of the present application;

[0028] Figure 5 Another side view of the speaker module according to an embodiment of the present application;

[0029] Figure 6 Another side view of the speaker module according to an embodiment of the present application;

[0030] Figure 7 Another front view of a speaker module according to an embodiment of the present application;

[0031] Figure 8 Another front view of a speaker module according to an embodiment of the present application;

[0032] Fig. 9 Another top view of a speaker module according to an embodiment of the present application;

[0033] Fig.10 This is the frequency response curve of a traditional speaker module;

[0034] Fig.11 Schematic diagram comparing the frequency response curve of the speaker module of the present application with the frequency response curve of a traditional speaker module. DETAILED DESCRIPTION

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] The frequency response of the speaker when working in the mid-high frequency is expected to be a straight curve to achieve a balanced audio experience. Traditional side-sound speaker modules will experience front cavity resonance and front cavity standing waves when working at high frequencies, resulting in an uneven frequency response with a series of valleys and peaks on the curve.

[0040] Based on this, the main solution of the present application is: the speaker module includes a speaker unit, a shell and a front sound cavity formed by a sound outlet hole opened on the shell; the shell includes a baffle wall arranged opposite to the sound outlet hole, and the speaker unit includes a diaphragm; the ratio of the distance from the diaphragm to the baffle wall to the width of the front sound cavity belongs to a preset cancellation range; wherein, the preset cancellation range includes a target value, the cavity resonance frequency corresponding to the target value is the same as the destructive interference frequency, the cavity resonance frequency is the frequency at which the speaker module generates a cavity resonance phenomenon, and the destructive interference frequency is the frequency at which the speaker module generates a destructive interference phenomenon.

[0041] The present application sets a preset cancellation range including a target value, and when the ratio between the distance from the diaphragm to the baffle wall and the width of the front sound cavity is the target value, the speaker module simultaneously generates a cavity resonance phenomenon and a destructive interference phenomenon at the same frequency. That is, it can be understood that within the preset cancellation range, the frequency at which the speaker module generates the cavity resonance phenomenon is consistent with or close to the frequency at which the destructive interference phenomenon is generated, so that the frequency response of the speaker module generates valleys and peaks at similar or identical frequencies, which can weaken or eliminate the valleys and peaks of the frequency response curve, thereby setting the ratio between the distance from the diaphragm to the baffle wall and the width of the front sound cavity within the preset cancellation range, thereby improving the smoothness of the frequency response curve of the speaker module.

[0042] The present application proposes a first embodiment of a speaker module, referring to Figures 1 to 9 As shown, the speaker module includes a speaker unit 10, a shell 20 and a front sound cavity 30 formed by a sound outlet hole 202 opened on the shell; the shell 20 includes a retaining wall 201 arranged opposite to the sound outlet hole 202, and the speaker unit 10 includes a diaphragm 101;

[0043] It should be noted that Figures 1 to 9 The diaphragm 101 shown is in a rectangular shape, but the shape of the diaphragm 101 includes but is not limited to a rectangle, and may also be an ellipse or a racetrack shape, and this embodiment does not impose any specific limitation on this.

[0044] The speaker module can be used for devices with sound outlets. The devices include but are not limited to mobile terminals such as mobile phones, laptops, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), etc., and fixed terminals such as digital TVs, desktop computers, etc., which are not specifically limited in this embodiment.

[0045] It should be noted that the sound generated by the vibration of the speaker unit 10 is transmitted from the sound outlet 202 to the external environment of the speaker module via the front sound cavity 30. Further, the number of the speaker units 10 can be one or more, and this embodiment does not impose any specific limitation on this.

[0046] The loudspeaker unit 10 is a basic sound-generating unit, which is used to convert an electrical signal into an acoustic signal. Specifically, the loudspeaker unit may 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 a 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, thereby realizing the sound of the diaphragm. For example, in a specific embodiment, the loudspeaker unit 10 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.

[0047] It is understandable that the housing 20 may be a three-dimensional structure composed of multiple sides, one of which is open, and the speaker unit 10 is accommodated in the space surrounded by the housing 20, and the speaker unit 10 divides the accommodation space into a front sound cavity and a rear cavity. Specifically, the diaphragm 101 of the speaker unit 10 divides the accommodation space into a front sound cavity and a rear cavity.

[0048] Furthermore, in order to ensure the sealing of the speaker module and the whole machine after assembly, a sealing ring can be pasted around the sound outlet 202.

[0049] The ratio of the distance between the diaphragm 101 and the retaining wall 201 to the width of the front acoustic cavity 30 belongs to a preset cancellation range; wherein, the preset cancellation range includes a target value, the cavity resonance frequency corresponding to the target value is the same as the destructive interference frequency, the cavity resonance frequency is the frequency at which the speaker module generates a cavity resonance phenomenon, and the destructive interference frequency is the frequency at which the speaker module generates a destructive interference phenomenon.

[0050] The distance between the diaphragm 101 and the retaining wall 201 may specifically be the distance between the center of the diaphragm 101 and the retaining wall 201 .

[0051] It can be understood that the ratio between the distance between the diaphragm 101 and the baffle 201 and the width of the front acoustic cavity 30 can be specifically the distance between the diaphragm 101 and the baffle 201 divided by the width of the front acoustic cavity 30, or the width of the front acoustic cavity 30 divided by the distance between the diaphragm 101 and the baffle 201. Exemplarily, the description and explanation of each embodiment of the present application is based on the distance between the diaphragm 101 and the baffle 201 divided by the width of the front acoustic cavity 30.

[0052] Reference Figure 2 As shown, the width of the front sound cavity 30 may specifically be the distance between two sides of the shell 20 which are arranged perpendicular to the vibration direction of the diaphragm 101 and have no sound outlet holes.

[0053] Destructive interference refers to the phenomenon that when two columns or sound waves meet at a certain point in space, if their phases differ by 180 degrees (i.e. half a wavelength, or π radians), they will cancel each other out, causing the vibration amplitude at that point to weaken or completely cancel out, which is manifested as a valley in the frequency response. This phenomenon usually occurs in side-firing speakers. When the sound waves radiate from the diaphragm, part of the sound waves radiate directly from the sound outlet, while the other part of the sound waves hit the retaining wall and reflect. When the reflected sound cavity resonance wave meets the original sound wave, if their phases are opposite, the sound waves will cancel each other out at a specific frequency.

[0054] Cavity resonance refers to the phenomenon that when the speaker diaphragm vibrates at a specific frequency, the sound wave forms a standing wave in the cavity due to the matching of the size and shape of the cavity (such as the front acoustic cavity or rear cavity of the speaker), resulting in resonance. This phenomenon will increase the radiation efficiency of the speaker at certain frequencies, which will appear as a peak on the frequency response curve.

[0055] When the ratio of the distance between the diaphragm 101 and the baffle wall 201 to the width of the front acoustic cavity is this target ratio, the destructive interference frequency corresponding to the speaker module is the same as the cavity resonance frequency, so that the speaker produces valleys and peaks at the same frequency at the same time, thereby offsetting the valleys and peaks to optimize the smoothness of the frequency response curve.

[0056] The preset cancellation range includes a target value. Specifically, the preset cancellation range may be a symmetrical interval range centered on the target value. For example, if the target value is T, the preset cancellation range may be T minus A to T plus A, etc., where A is a value greater than or equal to zero.

[0057] In this embodiment, a speaker module is provided, which includes a speaker unit, a shell, and a front sound cavity formed by a sound outlet hole opened on the shell; the shell includes a baffle wall arranged opposite to the sound outlet hole, and the speaker unit includes a diaphragm; the ratio between the distance from the diaphragm to the baffle wall and the width of the front sound cavity belongs to a preset cancellation range; wherein the preset cancellation range includes a target value, the cavity resonance frequency corresponding to the target value is the same as the destructive interference frequency, the cavity resonance frequency is the frequency at which the speaker module generates a cavity resonance phenomenon, and the destructive interference frequency is the frequency at which the speaker module generates a destructive interference phenomenon. Thus, in this embodiment, a preset cancellation range including a target value is provided, and when the ratio between the distance from the diaphragm to the baffle wall and the width of the front sound cavity is the target value, the speaker module generates a cavity resonance phenomenon and a destructive interference phenomenon at the same frequency. That is, it can be understood that, within the preset cancellation range, the frequency at which the speaker module produces cavity resonance is consistent with or close to the frequency at which it produces destructive interference, so that the speaker module frequency response produces valleys and peaks at similar or identical frequencies. This can weaken or eliminate the valleys and peaks of the frequency response curve, thereby setting the ratio of the distance from the diaphragm to the baffle wall to the width of the front sound cavity within this preset cancellation range, thereby improving the smoothness of the speaker module frequency response curve.

[0058] Further, based on the first embodiment of the speaker module, a second embodiment of the speaker module is proposed. In the second embodiment of the speaker module, the same or similar contents as those in the first embodiment can be referred to the above introduction and will not be described in detail later. On this basis, the speaker module is a side-sound speaker module, and the target value is 4.

[0059] A side-outlet speaker module refers to a module in which sound is radiated from the side of the speaker unit, and specifically, the direction of the sound is perpendicular to the direction of vibration of the diaphragm.

[0060] In the side-sound speaker module, when the speaker unit pushes the air, the sound waves emitted will propagate in all directions. In the scenario of the side-sound speaker module, the sound waves will propagate to the left, radiating from the side sound channel, and will also propagate to the right, reflecting when it touches the hard boundary of the retaining wall, and propagating to the left again. When the sound wave propagating to the left and the reflected wave reflected from the retaining wall are in anti-phase, the sound waves will cancel each other out, which appears as a valley in the frequency response. At this time, the sound path is twice the distance from the center of the diaphragm to the retaining wall, 2a, and the sound path is equal to half the wavelength c0 / 2f, that is, the destructive interference frequency is fdip=c0 / 4a, where c0 represents the speed of sound, a represents the distance from the center of the diaphragm to the retaining wall, and fdip represents the destructive interference frequency.

[0061] The width of the front acoustic cavity of the side-sound speaker module will affect the frequency of the standing wave in the front acoustic cavity. When the width of the front acoustic cavity of the side-sound speaker module is close to the wavelength of the sound wave, the radiation efficiency of the speaker will increase, which will appear as a peak in the frequency response. At this time, the width b of the front acoustic cavity is equal to the wavelength c0 / f, that is, the cavity resonance frequency is fpeak=c0 / b, where fpeak represents the cavity resonance frequency and b represents the width of the front acoustic cavity.

[0062] Assuming fpeak is equal to fdip, then 4a is equal to b, that is, b divided by a is equal to 4, based on which 4 is set as the target value. That is, in a preferred embodiment, referring to Figure 1 As shown, the speaker module is set to satisfy b equals 4a.

[0063] Furthermore, a preset cancellation range may be set with 4 as the center. For example, in a specific implementation, the preset cancellation range may be set to 3.2 to 4.8, that is, 4a divided by b is 0.8 to 1.2.

[0064] Further, based on the first and second embodiments of the speaker module, a third embodiment of the speaker module is proposed. In the third embodiment of the speaker module, the same or similar contents as those of the first and second embodiments can be referred to the above description and will not be described in detail later. On this basis, the housing includes an upper module shell and a lower module shell, and the speaker unit is disposed in a cavity formed by the upper module shell and the lower module shell.

[0065] The side sound outlet of this embodiment is formed by the cooperation between the upper shell of the module and the lower shell of the module, and during implementation, it can also be set on any one of the shells.

[0066] Furthermore, in a possible implementation, the module upper shell is a bottomless cavity formed by four side walls and a top wall, a sound hole is provided on one side wall, and the side wall opposite to the side wall with the sound hole is a retaining wall.

[0067] It should be noted that, for the side-sound speaker module, the top wall can specifically be the edge of the shell that is arranged parallel to the vibration direction of the diaphragm and above the diaphragm, and the four side walls can be the four edges of the shell that are arranged perpendicular to the vibration direction of the diaphragm.

[0068] In a possible implementation, the width of the front sound cavity is the distance between two target side walls in the module upper shell, wherein the target side walls are two side walls of the four side walls of the module upper shell that are arranged opposite to each other and neither of which has a sound outlet hole.

[0069] It should be noted that the target side walls are two side walls that are arranged opposite to and perpendicular to the vibration direction of the diaphragm and have no sound outlet holes.

[0070] In a possible implementation, the cross-section of the front acoustic cavity is rectangular, trapezoidal, elliptical or semi-racetrack.

[0071] Reference Figures 5 to 9 As shown, the cross-section of the front acoustic cavity can be rectangular, trapezoidal, elliptical or half-racetrack. By setting the cross-section of the front acoustic cavity to be trapezoidal, elliptical or half-racetrack, that is, by using a gradual hard boundary of the baffle wall, the distance a from the diaphragm to the baffle wall is no longer a constant value, thereby reducing the depth of the valley caused by the standing wave, and the width b of the front acoustic cavity is no longer a constant value, thereby reducing the depth of the peak caused by the standing wave.

[0072] It should be noted that when the cross-section of the front acoustic cavity is trapezoidal, elliptical or semi-racetrack, the distance between the diaphragm and the baffle wall and the width of the front acoustic cavity may be a gradually changing value, that is, it is not a fixed value. At this time, the distance a between the diaphragm and the baffle wall or the width b of the front acoustic cavity can be calculated by integration.

[0073] For example, refer to Figure 10 to Figure 11 As shown, Figure 10 to Figure 11 The horizontal axis represents the frequency in Hertz, and the vertical axis represents the sound pressure level in decibels. Fig.10 This is the normal frequency response curve of the speaker. Fig.11 For the purpose of this application ( Fig.11 The frequency response curve of the speaker module proposed in this patent) is compared with the conventional frequency response curve, through Fig.10 and Fig.11 It can be seen that the speaker module proposed in this application has a smoother frequency response curve.

[0074] Furthermore, based on the first embodiment, the second embodiment and the third embodiment of the speaker module, a fourth embodiment of the speaker module is proposed. In the fourth embodiment of the speaker module, the same or similar contents as those of the first embodiment, the second embodiment and the third embodiment can be referred to the above description and will not be described in detail later. On this basis, the shell further includes a module middle shell, and slots are provided at the bottom and the top of the module middle shell. The module lower shell is snapped to the bottom of the module middle shell through the slots, and the module upper shell is snapped to the top of the module middle shell through the slots.

[0075] In a possible implementation, the joint positions of the module upper shell and the module middle shell, and the joint positions of the module lower shell and the module middle shell are sealed by ultrasonic welding, gluing or crimping.

[0076] It should be noted that the shell also includes a module middle shell, which is a cavity formed by four side walls, the cavity is a square, and the two ends of the cavity are not closed in the longitudinal direction; in order to firmly snap the module lower shell to the bottom of the module middle shell, a recessed slot is provided at the bottom of the module middle shell, and the module lower shell is snapped to the bottom of the module middle shell through the slot; a recessed slot is provided at the top of the module middle shell, and the module upper shell is snapped to the top of the module middle shell through the slot. The above-mentioned module upper shell can be snapped to the top of the module middle shell by sealing methods such as ultrasonic welding, gluing, or crimping, and the module lower shell can also be snapped to the bottom of the module by sealing methods such as ultrasonic welding, gluing, or crimping.

[0077] Furthermore, a stepped fixing rib protruding from the inner wall of the module shell is provided in the middle of the module shell, which is used to fix the speaker unit in the middle of the module shell. The horizontal direction of the fixing rib is used to clamp the diaphragm folding ring part of the speaker unit upward, and the vertical direction of the fixing rib is used to fix the speaker unit. The fixing rib is integrally formed with the module shell.

[0078] Among them, the space between the speaker unit, the lower shell of the module, the middle shell of the module and the fixed ribs forms a rear sound cavity, and the front sound cavity is formed between the speaker unit, the fixed ribs and the bottom edge of the upper shell of the module. The fixed ribs separate the front sound cavity and the rear sound cavity. At the same time, the top end of the fixed ribs in the vertical direction is connected to the bottom edge of the upper shell of the module, and the cavity and the rear sound cavity are separated by the bottom edge of the upper shell of the module.

[0079] Furthermore, a cover plate can be provided on the top edge of the module upper shell to form a cavity (referred to as the target cavity) with the module upper shell. The cover plate can be fastened to the top of the module upper shell by sealing methods such as ultrasonic welding, gluing or crimping to complete the sealing of the top of the cavity.

[0080] The cover plate can be a thin plate with a certain strength. Using a metal sheet or alloy sheet with a certain strength as the cover plate, such as a steel sheet, an iron sheet, a copper sheet, etc., can ensure the strength while reducing the thickness of the cover plate. In addition, the cover plate can also be made of PET (Polyethylene Terephthalate) or other resin materials.

[0081] In order to connect the target cavity with the rear acoustic cavity, a conducting hole is opened at the position where the rear acoustic cavity and the target cavity meet at the bottom edge of the upper shell of the module, so as to connect the target cavity with the rear acoustic cavity to form a large rear acoustic cavity.

[0082] Since the speaker unit and the lower shell of the module are snapped onto the middle shell of the module in a sealed manner, the top of the target cavity is also sealed, so the large rear sound cavity formed by the connection between the target cavity and the rear sound cavity is sealed. Therefore, the sealed large rear sound cavity is separated from the front sound cavity.

[0083] It should be noted that since most of the components of the speaker module are made of plastic, it is difficult to perform secondary processing after the module shell is assembled. In addition, the speaker module itself has a small space, which will also increase the difficulty of secondary processing after the module shell is assembled. Therefore, the through hole is assembled during the assembly of the module shell, that is, holes are pre-opened at predetermined positions of the module middle shell and the module upper shell, and then when the module middle shell and the module upper shell are assembled, the openings of the module middle shell and the module upper shell are bonded and sealed to form a through hole.

[0084] In addition, in order to weaken the resonance of the front sound cavity sound outlet channel, a leakage hole can be opened at the position of the front sound cavity sound outlet channel relative to the upper shell of the module. The number and position of the leakage holes can be adjusted according to actual needs. By opening the leakage hole in the front sound cavity sound outlet channel, the resonance of the front sound cavity sound outlet channel can be weakened, and the Q value (quality factor value) of the resonance peak of the frequency response curve in the front sound cavity sound outlet channel can be effectively reduced. The high-frequency cutoff frequency of the frequency response curve can also be improved to a certain extent, the effective bandwidth of the product can be increased, and the distortion of the speaker can be improved. The distortion is manifested in the peak of the high-frequency cutoff frequency corresponding to the THD (Total Harmonic Distortion) curve. The present invention can effectively reduce the peak of the high-frequency cutoff frequency on the THD curve.

[0085] When assembling the product, in order to prevent the leakage hole from being blocked by other parts of the product, such as a mobile phone casing and other parts, an avoidance structure is provided on the outer side of the top wall of the module upper shell at the position corresponding to the leakage hole. In a specific embodiment, the avoidance structure is a groove, and the depth of the groove is less than the thickness of the top wall of the module upper shell. The avoidance structure can be set to different shapes according to different products.

[0086] Furthermore, a damping net may be laid on top of the avoidance structure. The shape of the damping net is the same as that of the avoidance structure. By laying the damping net, the peak value of the harmonic distortion curve caused by the resonance of the front sound cavity outlet channel can be more effectively reduced.

[0087] A sound outlet hole is also provided near the front sound cavity in the module shell, and the front sound cavity is connected to the sound outlet hole for exporting the sound signal emitted by the speaker module. By adding a cover plate on the top of the upper shell of the module, a cavity is formed in the upper shell of the module, and then the cavity is connected with the rear sound cavity, thereby increasing the volume of the rear sound cavity, improving the acoustic performance of the side-sound speaker module, and avoiding the influence of the local glue reduction method on the appearance of the speaker module, and to a certain extent, forming a filter effect on the sound emitted by the speaker module, which can smooth the sound quality curve and make the sound more pleasant.

[0088] The speaker module provided in the embodiment of the present application can solve the technical problem of how to improve the smoothness of the frequency response curve of the speaker module. Compared with the prior art, the beneficial effects of the speaker module provided in the present application are the same as the beneficial effects of the speaker module provided in the above embodiment, and the other technical features in the speaker module are the same as the features disclosed in the method of the previous embodiment, which will not be repeated here.

[0089] 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.

[0090] 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.

[0091] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program sensor according to various embodiments of the present application. In this regard, each box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0092] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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 speaker module, characterized in that: The speaker module comprises a speaker unit, a shell and a front sound cavity formed by a sound outlet hole opened on the shell; The housing includes a baffle wall arranged opposite to the sound outlet, and the speaker unit includes a diaphragm; The ratio of the distance between the diaphragm and the baffle wall to the width of the front acoustic cavity falls within a preset cancellation range; Among them, the preset cancellation range includes a target value, the cavity resonance frequency corresponding to the target value is the same as the destructive interference frequency, the cavity resonance frequency is the frequency at which the speaker module produces the cavity resonance phenomenon, and the destructive interference frequency is the frequency at which the speaker module produces the destructive interference phenomenon.

2. The speaker module according to claim 1, wherein: The target value is 4.

3. The speaker module according to claim 2, characterized in that: The preset cancellation range is 3.2 to 4.

8.

4. The speaker module according to claim 1, wherein: The housing comprises a module upper shell and a module lower shell, and the speaker unit is arranged in a cavity formed by the module upper shell and the module lower shell.

5. The speaker module according to claim 4, characterized in that: The module upper shell is a bottomless cavity formed by four side walls and a top wall, and a sound outlet hole is opened on one side wall, and the side wall opposite to the side wall with the sound outlet hole is a retaining wall.

6. The speaker module according to claim 5, characterized in that: The width of the front sound cavity is the distance between two target side walls in the upper shell of the module, wherein the target side walls are two side walls of the four side walls of the upper shell of the module that are arranged opposite to each other and neither of which has a sound outlet hole.

7. The speaker module according to claim 4, characterized in that: The shell body also includes a module middle shell, and slots are provided at the bottom and top of the module middle shell. The module lower shell is snapped onto the bottom of the module middle shell through the slots, and the module upper shell is snapped onto the top of the module middle shell through the slots.

8. The speaker module according to claim 7, wherein: The joint positions of the module upper shell and the module middle shell as well as the module lower shell and the module middle shell are sealed by ultrasonic welding, gluing or crimping.

9. The loudspeaker module according to any one of claims 1 to 8, characterized in that: The cross-section of the front acoustic cavity is rectangular, trapezoidal, elliptical or half-racetrack.

10. The loudspeaker module according to any one of claims 1 to 8, characterized in that: The speaker module is a side-sound speaker module.

Images