Voice module and smart head-mounted device

Abstract

The present invention discloses a sound generator module, comprising a module shell and a sound generator unit located in the module shell, wherein the diaphragm of the sound generator unit divides the space in the sound generator module into a front sound cavity and a rear sound cavity, and the sound generator module is provided with a main sound outlet hole connected to the front sound cavity, the main sound outlet hole is arranged on the side of the front sound cavity and on one side of the short axis of the sound generator unit; the distance from the center position of the sound generator unit to the opposite side wall of the main sound outlet hole is not less than 8.5 mm; the sound generator module is provided with an acoustic component for resonant sound absorption, and the acoustic component is provided with a connecting hole on the opposite side wall of the main sound outlet hole, and the acoustic component is connected with the front sound cavity through the connecting hole. By using the above-mentioned sound generator module as a sound generating device, the standing wave valley point that affects the flatness of the sensitivity curve is eliminated, and the mid-high frequency sound quality is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electroacoustic transducer, and more specifically, relates to a sound generator module and an intelligent head-mounted device. Background Art

[0002] In recent years, smart head-mounted devices such as VR and AR have developed rapidly. As an important sound-producing component, the structure of the speaker module has been continuously improved to meet the requirements of smart head-mounted devices with high-fidelity sound quality performance that can realistically reproduce various sound effects.

[0003] The sound generator module is an energy conversion device used to complete the conversion between electrical signals and acoustic signals. In the existing sound generator modules, especially for the modules with side sound outlets, the sound outlet channel of the front sound cavity is generally longer. Taking smart glasses as an example, in order to save product space, the sound generator module is usually set in the temple of the glasses. The front sound cavity and the rear sound cavity formed by the temple shell have a narrow sound outlet channel. This narrow sound outlet channel will cause many standing wave resonance peaks and valleys, especially affecting the flatness of the frequency response curve in the mid-high frequency band, reducing the mid-high frequency sound quality. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a sound generator module and an intelligent head-mounted device, which can eliminate the standing wave valley points of the sensitivity curve and improve the mid- and high-frequency sound quality.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] In the first aspect, an embodiment of the present invention provides a sound generator module, comprising a module shell and a sound generator unit located in the module shell, the diaphragm of the sound generator unit divides the space in the sound generator module into a front sound cavity and a rear sound cavity, the sound generator module is provided with a main sound outlet hole connected to the front sound cavity, the main sound outlet hole is arranged on the side of the front sound cavity and on one side of the short axis of the sound generator unit; the distance from the center position of the sound generator unit to the opposite side wall of the main sound outlet hole is not less than 8.5 mm; an acoustic component for resonant sound absorption is provided in the sound generator module, the acoustic component is provided with a connecting hole on the opposite side wall of the main sound outlet hole, and the acoustic component is connected with the front sound cavity through the connecting hole.

[0007] In a possible implementation, the resonance frequency of the acoustic component is located within a frequency band corresponding to a standing wave trough of the sound generator module.

[0008] In a possible implementation, there are multiple acoustic components, and any one of the acoustic components is individually connected to the front acoustic cavity through its own connecting hole.

[0009] In a possible implementation, the number of the acoustic components is three, and the resonance frequency of one of the acoustic components is the frequency corresponding to the lowest sensitivity point of the standing wave valley.

[0010] In a possible implementation, at least a portion of the module housing is the entire housing of the smart head mounted device.

[0011] In a possible implementation, the acoustic component is a folded pipe, one end of the folded pipe is closed and the other end serves as a connecting hole to communicate with the front acoustic cavity.

[0012] Preferably, each of the folded pipes is formed by partitions that are arranged at equal intervals and spaced apart from each other.

[0013] In a possible implementation, the number of the folded pipes is at least two, and the equivalent lengths of any two folded pipes are different.

[0014] Preferably, the number of the folded pipes is at least three, and the resonance frequencies of at least three of the folded pipes are distributed with equal bandwidth.

[0015] In a possible implementation, the acoustic component is a Helmholtz resonator, and an opening end of the Helmholtz resonator serves as a communicating hole and is communicated with the front acoustic cavity.

[0016] Preferably, the number of the Helmholtz resonators is at least three, and the resonance frequencies of at least three of the Helmholtz resonators are distributed with equal bandwidth.

[0017] In a second aspect, an embodiment of the present invention provides a smart head-mounted device, which includes the above-mentioned sound generator module.

[0018] In a possible implementation, the smart head mounted device includes a complete housing, and the complete housing forms at least a partial structure of the module housing of the sound generator module.

[0019] The advantages and beneficial effects of the present invention are:

[0020] The sound generator module of the embodiment of the present invention is a side sound module, the main sound outlet is arranged on the side of the front sound cavity and on one side of the short axis of the sound generator unit, and the distance from the center position of the sound generator unit of the module to the opposite side wall of the main sound outlet is not less than 8.5mm, so that the front sound cavity has a narrow and long sound outlet channel, and this narrow and long sound outlet channel will cause an obvious standing wave resonance valley below 10kHz. In order to reduce this standing wave valley caused by standing wave interference, the present invention arranges an acoustic component that can resonate and absorb sound in the sound generator module, and the acoustic component is provided with a connecting hole on the opposite side wall of the main sound outlet, and is connected to the front sound cavity through the connecting hole, so that the resonant sound absorption characteristics of the acoustic component can be utilized to resonate and absorb sound at the frequency of generating standing waves, reduce the reflection of the opposite side wall of the main sound outlet in the front sound cavity, avoid standing wave interference between the reflected sound wave and the emitted sound wave, destroy the generation of standing waves, and then eliminate the standing wave valley points that affect the flatness of the sensitivity curve, and improve the mid- and high-frequency sound quality.

[0021] The smart head-mounted device of the embodiment of the present invention, by using the above-mentioned sound generator module as a sound-generating device, can eliminate the standing wave valley points that affect the flatness of the sensitivity curve and improve the mid- and high-frequency sound quality.

[0022] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0023] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 A schematic diagram of the structure of a sound generator module installed in a smart head-mounted device provided in an embodiment of the present invention;

[0026] Figure 2 A schematic cross-sectional view of a sound generator module provided with a folded pipe according to an embodiment of the present invention;

[0027] Figure 3 A schematic cross-sectional view of a front sound cavity structure of a sound generator module provided with a folded pipe with the top removed provided in an embodiment of the present invention;

[0028] Figure 4 A schematic top view of a front sound cavity structure of a sound generator module provided with a folded pipe with the top removed provided in an embodiment of the present invention;

[0029] Figure 5 A frequency response comparison curve diagram before and after the folded pipe is set provided in an embodiment of the present invention;

[0030] Figure 6 A schematic cross-sectional view of a front acoustic cavity structure with the top removed of a sound generator module with a Helmholtz resonator provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described below are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0035] Example

[0036] like Figure 1-4As shown, the sound generator module provided by the invention includes a module housing and a sound generator unit 10 located in the module housing. The module housing includes a module upper shell 1 and a module lower shell 2, and the sound generator unit 20 is installed and fixed in the module housing. Among them, the sound generator unit 20 includes a vibration system and a magnetic circuit system. The vibration system includes a diaphragm 101 and a voice coil combined with the lower side of the diaphragm 101. The magnetic circuit system is provided with a magnetic gap corresponding to the voice coil. The voice coil moves up and down in the magnetic gap according to the input audio electrical signal. The diaphragm 101 vibrates with the up and down movement of the voice coil, instigating the air to make a sound, thereby completing the energy conversion between electricity and sound.

[0037] Here, the module housing includes the upper module housing 1 and the lower module housing 2. In actual applications, the module housing may also be other structures, such as a combination of more shells, or an integral molding. In some embodiments, at least part of the module housing may also be the entire housing of the smart wearable device. That is to say, the sound generator module of this embodiment 1 may not have a module housing, or may only have a part of the module housing. When applied to a smart wearable device, the module housing may be formed by the entire housing of the smart wearable device.

[0038] The sound generator unit 10 of the present application is a long strip structure, which is rectangular or runway-shaped, including a long axis side and a short axis side. For the sound generator unit of the runway-shaped structure, the long axis side corresponds to the straight side, and the short axis side corresponds to the position of the curved side. The diaphragm 101 of the sound generator unit 10 divides the space in the sound generator module into a front sound cavity 11 and a rear sound cavity 12. Since the sound generator unit 10 is a long strip structure, the corresponding front sound cavity 11 is a long and narrow cavity. Figure 1 and Figure 3 As shown, the sound generator module of the present application is provided with a main sound outlet 3 connected to the front sound cavity 11, and the main sound outlet 3 is provided on the side of the front sound cavity 11 and on one side of the short axis of the sound generator unit. For such a sound generator module with a narrow and long front sound cavity and sound emitted from the short axis side of the front sound cavity, the narrow and long front sound cavity will cause numerous standing wave resonance peaks and valleys, affecting the listening experience. Among them, the first standing wave valley introduced by the first-order standing wave resonance of the front cavity has the lowest frequency, which especially affects the flatness of the sensitivity curve and reduces the listening experience.

[0039] The standing wave valley in the sound generator module mainly comes from the interference cancellation of the reflected wave from the side wall of the front sound cavity and the emitted wave from the sound output direction. When the wavelength λ of the frequency of the sound wave radiated by the sound generator unit is twice the length of the front sound cavity, the distance from the center of the unit to the opposite side wall of the sound outlet of the front sound cavity is λ / 4. The sound wave propagating in this direction is reflected by the wall and returns to the center of the unit for a distance of λ / 2. The phase is exactly opposite to the phase of the radiated sound wave at this time, causing coherent cancellation, thereby reducing the volume velocity at the sound outlet position, and then reducing the radiation efficiency to form a standing wave valley. This standing wave valley has not attracted much attention in conventional miniature sound generator modules because the frequency of the standing wave valley is related to the length of the front sound cavity. The shorter the front sound cavity, the higher the frequency. In the miniature sound generator module, the standing wave valley is located above 15kHz, which is beyond the hearing range of the human ear and has little effect on the user's auditory experience. However, for the sound generator module installed in the smart head-mounted device, due to its long and narrow front acoustic cavity and the corresponding large λ value, the standing wave trough will shift to the low frequency and appear below 10KHz, usually at 3-6kHz, seriously affecting the user's mid- and high-frequency sound quality.

[0040] It has been verified that for a side-sound speaker module with a main sound outlet located on the short axis side, when the distance between the center of the speaker unit and the second side wall 14 is about 8.5 mm, a standing wave phenomenon will appear at 10 KHz. When the distance between the center of the speaker unit and the second side wall 14 is greater than 8.5 mm, a standing wave trough will appear within 10 KHz, which will seriously affect the user's listening experience. The value of 8.5 mm in this embodiment is obtained based on a large number of statistical experimental verifications, and this value is related to the sound wave frequency band that can be perceived by the human ear.

[0041] In order to address the problem that the main sound outlet is located on one side of the short axis of the sound outlet unit, which makes the sound outlet module with a narrow front sound cavity prone to standing wave interference, the sound outlet module of this embodiment is provided with a resonant sound-absorbing acoustic component, and the acoustic component is provided with a connecting hole on the wall surface opposite to the main sound outlet, and the acoustic component is connected with the front sound cavity 11 through the connecting hole.

[0042] Specifically, the sound generator module has a first side wall 13 with a main sound outlet 3, and a second side wall 14 opposite to the first side wall 13. The acoustic component is arranged on the side of the second side wall 14, and is provided with a connecting hole penetrating the second side wall 14. At this time, when the sound waves emitted by the sound generator unit 10 are radiated to the side of the second side wall 14, the resonance sound absorption of the acoustic component reduces the reflection of the main sound outlet in the front sound cavity on the side wall surface, avoids the interference of the reflected sound waves with the emitted sound waves, avoids the generation of standing waves, and further eliminates the standing wave valleys that affect the flatness of the mid- and high-frequency bands of the frequency response curve, thereby improving the sensitivity of the mid- and high-frequency bands.

[0043] The acoustic component resonates at a specific frequency. Preferably, the resonant frequency of the acoustic component is located within a frequency band corresponding to the standing wave valley of the sound generator module.

[0044] Figure 5 A frequency response comparison curve diagram before and after the folded pipe is set is provided in an embodiment of the present invention, wherein the black curve is the frequency response curve adjusted by the folded pipe, and the gray curve is the frequency response curve without the folded pipe adjustment. By comparison, it can be seen that the sensitivity of the unadjusted frequency response curve is significantly reduced at around 4KHz, and a standing wave valley appears, while the frequency response curve adjusted by the folded pipe is smoother in the mid-high frequency band. Specifically, the fluctuation amplitude of the frequency response curve at the position where the standing wave appears in the mid-high frequency band of the unadjusted frequency response curve exceeds 30dB, while the fluctuation amplitude of the frequency response curve corresponding to the original standing wave position after adjustment of the acoustic component is about 10dB. The present application defines the standing wave valley as the curve segment between the point where the frequency response curve starts to decline and stops rising at the lowest point of the curve, that is, the curve segment between the resonance peak vertex on the left side of the lowest point of the standing wave valley and the resonance peak vertex on the right side of the lowest point of the standing wave valley. The frequency band between the point where the frequency response curve corresponding to the standing wave valley starts to decline and the point where it stops rising is the frequency band corresponding to the standing wave valley (or the frequency band where the standing wave valley is located). When the resonance frequency of the acoustic component is within the frequency band where the standing wave trough is located, the sensitivity of the frequency band where the standing wave trough is located will be significantly improved.

[0045] In order to further improve the sensitivity of the frequency band of the standing wave trough, the present application has multiple acoustic components, and each acoustic component is individually connected to the front sound cavity through its own connecting hole, thereby forming multiple independent acoustic components with specific resonant frequencies. The resonant sound absorption structure has a higher sound absorption efficiency only when it resonates, and a single acoustic component only has one narrow resonance peak. According to the bandwidth range of the standing wave trough, arranging the resonance frequencies of multiple folded pipes with equal bandwidth can significantly improve the trimming effect of the frequency response curve and make the frequency response curve smoother. The number of acoustic components in this embodiment is three, and the resonance frequencies of the three acoustic components are all within the frequency band where the standing wave trough is located, and the three resonance frequencies are distributed with equal bandwidths. The three resonance frequencies with equal bandwidth distribution significantly improve the sensitivity of the corresponding frequency band of the standing wave trough, making the frequency response curve at the mid- and high-frequency range smoother. Figure 6 As shown in the figure, the positions indicated by the three arrows are the resonance peaks formed by the three acoustic components. Due to the existence of the three resonance peaks, the frequency response curve corresponding to the standing wave valley is pulled up, making the frequency response curve of the mid-high frequency band smooth, thereby improving the listening experience of the user. Among them, the specific frequency band of the standing wave valley corresponding to the resonance frequency of the acoustic components with equal bandwidth distribution of the three resonance frequencies can be obtained through simulation calculation, based on the ability to effectively fill the standing wave valley.

[0046] The number of folded pipes is not limited to three, and may be one or two. When the number of acoustic components is one, the resonant frequency of the acoustic component is the frequency in the middle region of the standing wave valley frequency band. When the number of acoustic components is two, the frequency of the standing wave valley corresponding to the resonant frequencies of the two acoustic components needs to be obtained through simulation and calculation, so as to effectively fill the standing wave valley.

[0047] As an implementation scheme, the acoustic component of the present application is a folded pipe, one end of the folded pipe is closed and the other end serves as a connecting hole to communicate with the front acoustic cavity 11.

[0048] exist Figure 3 , Figure 4 In the illustrated embodiment, the acoustic component is a folded pipe, which is disposed on one side of the second side wall 14 and close to the other short axis side of the sound-generating device 10 , and the folded pipe is provided with a connecting hole penetrating the second side wall 14 .

[0049] Taking the folded pipe 41 as an example, the folded pipe 41 of the present application is formed by partitions 411 arranged at equal intervals, and the folded pipe 41 extends from the closed end to the second side wall 14, and penetrates the second side wall 14 to form a connecting hole 410 connected to the front sound cavity. Compared with a straight pipe or other forms of folded pipes, this folded pipe 41 formed by partitions 411 can make more full use of the internal space of the sound generator module.

[0050] The number of folded pipes is at least two, and the equivalence between any two folded long pipes is different. The number of folded pipes is at least three, and the resonant frequencies of at least three of the folded pipes are distributed with equal bandwidth. This embodiment also includes a folded pipe 42 and a folded pipe 43, which are also formed by partitions arranged at equal intervals. The folded pipe 42 is formed by a plurality of partitions 421, and the folded pipe 43 is formed by a plurality of partitions 431. The folded pipe 42 and the folded pipe 43 are respectively provided with a connecting hole 421 and a connecting hole 431 connected to the front sound cavity 11, thereby forming an independent acoustic component. Among them, the spacing between the partitions of the folded pipe 41, the folded pipe 42 and the folded pipe 43 can be the same or different.

[0051] When the number of acoustic components is three, the resonant frequency of one of the acoustic components is the frequency corresponding to the lowest sensitivity point of the standing wave valley. The lowest sensitivity point of the standing wave valley refers to the lowest point of the frequency response curve corresponding to the frequency band where the standing wave valley is located. The resonant frequency of the folded duct 42 in this embodiment is the same as the resonant frequency of the lowest point of the standing wave valley. Since the frequency where the lowest sensitivity point of the standing wave valley is located is the frequency that needs to be focused on, the resonant frequency of the folded duct 42 is the same as the frequency of the lowest sensitivity point of the standing wave valley, which can solve the standing wave problem more specifically.

[0052] The equivalent length of the folded pipe determines its resonant frequency, and the equivalent length of the folded pipe is the sum of the lengths of each section of the pipe. Since the resonant frequencies of different folded pipes are different, the equivalent lengths of different folded pipes are usually different. Optionally, the equivalent lengths of the folded pipe 41, folded pipe 42 and folded pipe 43 of the present application are arithmetically distributed, and the resonant frequencies of the three folded pipes are distributed in an equiband width within the frequency band where the standing wave trough is located, and evenly cover the standing wave trough. At this time, the spacing between the partitions in the three folded pipes is equal.

[0053] It should be understood that the folded pipe can also be in a form of non-partition isolation, and any pipe extending from the closed end to the second side wall 14 in a winding manner can be understood as a folded pipe. In addition, the folded pipe can be a structure with equal cross-section or unequal cross-section, or, for a folded pipe formed by multiple partitions, the spacing between the multiple partitions can also be different, as long as the resonant frequency of the folded pipe is within the frequency band where the standing wave trough is located. Under the premise that the resonant frequency of the folded pipe is within the frequency band where the standing wave trough is located and the bandwidth distribution is equal, the three folded pipes can be folded pipes of the same form or folded pipes of different forms.

[0054] In this embodiment, the three folded pipes are all arranged on the upper side of the diaphragm 101 and occupy the physical space on the upper side of the diaphragm 101 in the sound generator module. Alternatively, any folded pipe may also occupy the physical space on the upper side and the lower side of the diaphragm 101 in the sound generator module at the same time, such as the connecting hole of the folded pipe is located on the upper side of the diaphragm 101, and the closed end occupies the physical space on the lower side of the diaphragm 101 in the sound generator module.

[0055] In another embodiment of the present application, the acoustic component is a Helmholtz resonator, and the opening end of the Helmholtz resonator is connected to the front acoustic cavity 11 as a connecting hole. Figure 6 As shown, taking the Helmholtz resonator 51 as an example, the Helmholtz resonator 51 includes a cavity 511 and a communication hole 510 , and the cavity 511 and the communication hole 510 together define the resonance frequency of the Helmholtz resonator 51 .

[0056] Among them, the number of Helmholtz resonators can be one or more. When the number of Helmholtz resonators is one, the resonant frequency of the Helmholtz resonator corresponds to the frequency band in the middle area of ​​the frequency band where the standing wave trough is located. When the number of Helmholtz resonators is multiple, the resonant frequencies of the multiple Helmholtz resonators are all located in the frequency band where the standing wave trough is located, and are distributed with equal bandwidth.

[0057] In this embodiment, the number of the Helmholtz resonators is at least three, and the resonance frequencies of the at least three Helmholtz resonators are distributed in equal bandwidths. Figure 6The Helmholtz resonator shown includes a Helmholtz resonator 51, a Helmholtz resonator 52 and a Helmholtz resonator 53, wherein the three resonators are connected to the front sound cavity through a connecting hole 510, a connecting hole 520 and a connecting hole 530 respectively, and the cavity volumes of the cavity 511, the cavity 521 and the cavity 531 of the present application are different. Among them, the connecting hole 510, the connecting hole 520 and the connecting hole 530 can be structures with the same cross-sectional dimensions, or can be structures with different cross-sectional dimensions, as long as the resonant frequencies of the three resonators are distributed with equal bandwidth.

[0058] In this embodiment, the three Helmholtz resonators can be arranged on the upper side of the diaphragm 101 and occupy the physical space on the upper side of the diaphragm 101 in the sound generator module. Alternatively, any Helmholtz resonator can occupy the physical space on the upper side and the lower side of the diaphragm 101 at the same time, such as the connecting hole of the Helmholtz resonator can be located on the upper side of the diaphragm 101, the cavity can occupy the space on the upper side and the lower side of the diaphragm 101, or only occupy the physical space on the lower side of the diaphragm 101 in the sound generator module.

[0059] It should be noted that the types of acoustic components of the present application may be different. For example, when two acoustic components are provided, one of them is a folded pipe and the other is a Helmholtz resonator. Such a solution is also within the protection scope of the present application.

[0060] In addition, the equal bandwidth distribution mentioned in the present application is not an arithmetic distribution in the strict sense of the frequency value, and there can be errors within a reasonable range as long as the distribution is basically equal bandwidth.

[0061] Figure 1 This is a partial structural diagram of a smart head-mounted device. The main sound outlet 3 of the smart head-mounted device is arranged close to the human ear 6, so that the human ear can directly receive the sound waves radiated from the front sound cavity of the sound generator module. The smart head-mounted device also includes a rear cavity sound leakage hole connected to the rear sound cavity of the sound generator module. The main sound outlet and the rear cavity sound leakage hole form a dipole, which can form far-field sound elimination and protect user privacy.

[0062] The smart head mounted device comprises a whole housing, which forms at least a partial structure of a module housing of a sound generator module.

[0063] It should be noted that the module housing of the sound generator module of the present application can be the complete housing of the smart head-mounted device, that is, the sound generator unit is directly assembled into the smart head-mounted device, and the complete housing of the smart head-mounted device serves as the module housing of the sound generator device. Alternatively, a part of the module housing of the sound generator module is the complete housing of the smart head-mounted device, for example, the upper module housing 1 of the sound generator module can be the complete housing of the smart head-mounted device, or the lower module housing 2 of the sound generator module is the complete housing of the smart head-mounted device.

[0064] Figure 2-4 , Figure 6 The accompanying drawings are only for schematic purposes. The module housing in the accompanying drawings is the housing of the smart head-mounted device. It should be understood that the module housing of the sound generator module can be a component different from the housing of the whole device, that is, after the sound generator unit is assembled into the module housing, the sound generator module is assembled into the housing of the whole device as a whole. At this time, the main sound outlet of the sound generator module is arranged correspondingly to the sound outlet on the housing of the whole device, and the sound waves of the sound cavity in front of the sound generator module are guided out. This solution is also within the protection scope of this application.

[0065] The above is only a specific embodiment of the present invention. Under the above teachings of the present invention, those skilled in the art can make other improvements or modifications on the basis of the above embodiments. Those skilled in the art should understand that the above specific description is only to better explain the purpose of the present invention. Those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. In this way, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A sound generator module, comprising a module housing and a sound generator unit located in the module housing, wherein a diaphragm of the sound generator unit divides the space in the sound generator module into a front sound cavity and a rear sound cavity, wherein: The sound generator module is provided with a main sound outlet hole connected to the front sound cavity, and the main sound outlet hole is provided on the side of the front sound cavity and on one side of the short axis of the sound generator unit; The distance from the center of the sound generator unit to the opposite side wall of the main sound outlet is not less than 8.5 mm; An acoustic component for resonant sound absorption is provided in the sound generator module, the acoustic component is arranged in a physical space on the upper side of the diaphragm or the lower side of the diaphragm or the upper and lower sides of the diaphragm, the acoustic component is provided with a connecting hole on the wall surface opposite to the main sound outlet, the acoustic component is connected with the front sound cavity through the connecting hole, and the resonant frequency of the acoustic component is located in the frequency band corresponding to the standing wave valley of the sound generator module to fill the standing wave valley; There are a plurality of acoustic components, and any of the acoustic components is individually connected to the front acoustic cavity through its own connecting hole. The resonance frequencies of the plurality of acoustic components are arranged with equal bandwidth.

2. The sound generator module according to claim 1, characterized in that: The number of the acoustic components is three, and the resonance frequency of one of the acoustic components is the frequency corresponding to the lowest sensitivity point of the standing wave valley.

3. The sound generator module according to claim 1, characterized in that: At least part of the module housing is the entire housing of the smart head-mounted device.

4. The sound generator module according to any one of claims 1 to 3, characterized in that: The acoustic component is a folded pipe, one end of which is closed and the other end of which serves as a connecting hole and is connected to the front acoustic cavity.

5. The sound generator module according to claim 4, characterized in that: Each of the folded pipes is formed by partitions arranged at equal intervals and spaced apart from each other.

6. The sound generator module according to claim 4, characterized in that: The number of the folded pipes is at least two, and the equivalent lengths of any two folded pipes are different.

7. The sound generator module according to claim 4, characterized in that: The number of the folded pipes is at least three, and the resonance frequencies of at least three of the folded pipes are distributed in equal bandwidths.

8. The sound generator module according to any one of claims 1 to 3, characterized in that: The acoustic component is a Helmholtz resonator, and the opening end of the Helmholtz resonator is connected to the front acoustic cavity as a communication hole.

9. The sound generator module according to claim 8, characterized in that: The number of the Helmholtz resonators is at least three, and the resonance frequencies of at least three of the Helmholtz resonators are distributed in equal bandwidths.

10. A smart head mounted device, characterized in that: The smart head mounted device comprises the sound generator module according to any one of claims 1 to 9.

11. The smart head mounted device according to claim 10, characterized in that: The smart head mounted device comprises a whole housing, and the whole housing forms at least a partial structure of the module housing of the sound generator module.

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