Intelligent head-mounted equipment
阅读说明：本技术 智能头戴设备 (Intelligent head-mounted equipment ) 是由 王海荣 郭翔 朱本超 于 2021-07-07 设计创作，主要内容包括：本发明公开一种智能头戴设备,该智能头戴设备包括设备壳体和安装于设备壳体内的扬声器模组,设备壳体上设有前出声孔和后出声孔,扬声器模组包括模组壳体和扬声器单体,模组壳体内设有安装空间,模组壳体上设有出声孔和泄声孔,出声孔与前出声孔对接连通,泄声孔与后出声孔对接连通,扬声器单体设在安装空间内,扬声器单体包括能够振动发声的振膜,振膜第一侧至出声孔路径上的有效容积形成前声腔,振膜第二侧至泄声孔路径上的有效容积形成后声腔；其中,前声腔的体积V1与后声腔的体积V2满足关系式：0.42≤V1/V2≤2.5。本发明旨在提供一种有效改善产品的漏音,并拓宽高频截止频率的智能头戴设备。(The invention discloses intelligent head-mounted equipment, which comprises an equipment shell and a loudspeaker module arranged in the equipment shell, wherein the equipment shell is provided with a front sound outlet hole and a rear sound outlet hole; wherein, the volume V1 of the front sound cavity and the volume V2 of the rear sound cavity satisfy the relation: V1/V2 is more than or equal to 0.42 and less than or equal to 2.5. The invention aims to provide the intelligent head-mounted equipment which can effectively improve the sound leakage of a product and broaden the high-frequency cut-off frequency.)
1. The utility model provides an intelligence head-mounted apparatus, include the equipment casing with install in speaker module in the equipment casing, go out the phonate hole and go out the phonate hole after with on the equipment casing, the distance between back phonate hole and the earhole of wearer is greater than distance between preceding phonate hole and the earhole of wearer, its characterized in that, the speaker module includes:
the module shell is internally provided with an installation space, the module shell is provided with a sound outlet hole and a sound release hole, the sound outlet hole is in butt joint communication with the front sound outlet hole, and the sound release hole is in butt joint communication with the rear sound outlet hole; and
the loudspeaker single body is arranged in the installation space and comprises a vibrating diaphragm capable of vibrating and sounding, a front sound cavity is formed from an effective volume on a path from a first side of the vibrating diaphragm to the sound outlet hole, and a rear sound cavity is formed from a second side of the vibrating diaphragm to an effective volume on a path from the second side of the vibrating diaphragm to the sound outlet hole;
wherein the volume V1 of the front acoustic chamber and the volume V2 of the rear acoustic chamber satisfy the relation: V1/V2 is more than or equal to 0.42 and less than or equal to 2.5.
2. The smart headset of claim 1, wherein the volume of the front acoustic cavity, V1, satisfies the relationship: v1 is more than or equal to 0.18cc and less than or equal to 0.48 cc.
3. The smart headset of claim 1, wherein the distance between the front sound outlet and the rear sound outlet is less than 50mm, the distance between the rear sound outlet and the ear canal of the wearer is a first distance, the distance between the front sound outlet and the ear canal of the wearer is a second distance, and the difference between the first distance and the second distance is greater than 5 mm.
4. The smart headset of claim 3, wherein the front sound outlet aperture and the rear sound outlet aperture are configured to form an acoustic dipole effect when the smart wearable device sounds.
5. The smart headset of claim 1, wherein the volume of the front acoustic chamber V1 and the volume of the rear acoustic chamber V2 satisfy the relationship: V1/V2 is 1.
6. The intelligent headset of any one of claims 1 to 5, wherein the module housing comprises an upper shell and a lower shell, the upper shell comprises a horizontally arranged bottom plate and a side plate arranged around the bottom plate and extending towards the lower shell, the lower shell is hermetically connected with the side plate, and the sound outlet are respectively arranged on two opposite side walls of the side plate.
7. The intelligent headset of claim 6, wherein the speaker module further comprises a first auxiliary housing, the first auxiliary housing is disposed in the installation space and defines a first auxiliary cavity with an inner wall of the front acoustic cavity, and the first auxiliary cavity is communicated with the front acoustic cavity through a first ventilation micro-hole.
8. The intelligent headset of claim 6, wherein the speaker module further comprises a second auxiliary housing, the second auxiliary housing is disposed in the mounting space and defines a second auxiliary cavity with an inner wall of the rear acoustic cavity, and the second auxiliary cavity is communicated with the rear acoustic cavity through a second ventilation micro-hole.
9. The intelligent headset of claim 6, wherein the vibration system and the magnetic circuit system of the speaker unit jointly define a first inner cavity, the housing of the speaker unit jointly defines a second inner cavity together with the side plate and the lower housing, respectively, and the first inner cavity and the second inner cavity are communicated to jointly form the rear acoustic cavity.
10. The intelligent headset of claim 6, wherein the base plate comprises a body and a metal sheet, the body is a plastic part, and the plastic part and the metal sheet are integrally injection-molded.
11. The intelligent headset of any one of claims 1 to 5, wherein the speaker module further comprises a sound absorbing member disposed in the front acoustic cavity and/or the rear acoustic cavity to adjust a volume ratio of the front acoustic cavity to the rear acoustic cavity.
Technical Field
The invention relates to the technical field of electroacoustic equipment, in particular to intelligent head-mounted equipment.
Background
Along with the development of scientific technology, intelligent wearing equipment has brought very big facility for people's life, and the intelligence head-mounted equipment that is as intelligent wearing equipment also more and more popular, and intelligent head-mounted equipment can be regarded as a miniature intelligent equipment, and it has corresponding collection, processing or the function of demonstration data. The user can install programs provided by software service providers such as software and games in the intelligent head-mounted equipment, can also complete functions of adding schedules, map navigation, interacting with friends, taking pictures and videos, developing video calls with friends and the like through voice or action control, and can realize wireless network access through a mobile communication network.
In the correlation technique, the speaker module on the intelligent head-mounted device usually sets up open back sound chamber to satisfy consumer's listening experience. However, the open type rear sound cavity can cause serious sound leakage to the outside, so that the protection of personal privacy is not facilitated, and the use effect of a user is influenced.
Disclosure of Invention
The invention mainly aims to provide intelligent head-mounted equipment, and aims to provide intelligent head-mounted equipment which effectively improves the noise leakage of products and widens the high-frequency cut-off frequency.
In order to achieve the above object, the intelligent head-mounted device provided by the present invention includes a device housing and a speaker module installed in the device housing, wherein the device housing is provided with a front sound outlet and a rear sound outlet, a distance between the rear sound outlet and an ear hole of a wearer is greater than a distance between the front sound outlet and the ear hole of the wearer, and the speaker module includes:
the module shell is internally provided with an installation space, the module shell is provided with a sound outlet hole and a sound release hole, the sound outlet hole is in butt joint communication with the front sound outlet hole, and the sound release hole is in butt joint communication with the rear sound outlet hole; and
the loudspeaker single body is arranged in the installation space and comprises a vibrating diaphragm capable of vibrating and sounding, a front sound cavity is formed from an effective volume on a path from a first side of the vibrating diaphragm to the sound outlet hole, and a rear sound cavity is formed from a second side of the vibrating diaphragm to an effective volume on a path from the second side of the vibrating diaphragm to the sound outlet hole;
wherein the volume V1 of the front acoustic chamber and the volume V2 of the rear acoustic chamber satisfy the relation: V1/V2 is more than or equal to 0.42 and less than or equal to 2.5.
In one embodiment, the volume V1 of the front acoustic chamber satisfies the relationship: v1 is more than or equal to 0.18cc and less than or equal to 0.48 cc.
In an embodiment, a distance between the front sound outlet and the rear sound outlet is less than 50mm, a distance between the rear sound outlet and the ear hole of the wearer is a first distance, a distance between the front sound outlet and the ear hole of the wearer is a second distance, and a difference between the first distance and the second distance is greater than 5 mm.
In an embodiment, the front sound outlet and the rear sound outlet are configured to form an acoustic dipole effect when the smart wearable device sounds.
In one embodiment, the volume of the front acoustic chamber V1 and the volume of the rear acoustic chamber V2 satisfy the relationship: V1/V2 is 1.
In an embodiment, the module housing includes an upper housing and a lower housing, the upper housing includes a horizontally disposed bottom plate and a side plate disposed around the bottom plate and extending toward the lower housing, the lower housing is hermetically connected to the side plate, and the sound outlet are respectively disposed on two opposite side walls of the side plate.
In an embodiment, the speaker module further includes a first auxiliary housing, the first auxiliary housing is disposed in the installation space, and defines a first auxiliary cavity with an inner wall of the front acoustic cavity, and the first auxiliary cavity is communicated with the front acoustic cavity through a first ventilation micro-hole.
In an embodiment, the speaker module further includes a second auxiliary housing, the second auxiliary housing is disposed in the installation space, and defines a second auxiliary cavity with the inner wall of the rear acoustic cavity, and the second auxiliary cavity is communicated with the rear acoustic cavity through a second ventilation micro-hole.
In an embodiment, the vibration system and the magnetic circuit system of the speaker unit jointly define a first inner cavity, the shell of the speaker unit, the side plate and the lower shell respectively jointly define a second inner cavity, and the first inner cavity and the second inner cavity are communicated to jointly form the rear sound cavity.
In one embodiment, the bottom plate comprises a body and a metal sheet, the body is a plastic part, and the plastic part and the metal sheet are integrally injection-molded.
In an embodiment, the speaker module further includes a sound absorbing member, and the sound absorbing member is disposed in the front acoustic cavity and/or the rear acoustic cavity to adjust a volume ratio of the front acoustic cavity to the rear acoustic cavity.
According to the technical scheme, the distance between the rear sound outlet and the ear hole of the wearer on the equipment shell is limited to be larger than the distance between the front sound outlet and the ear hole of the wearer, so that the sound outlet on the module shell of the loudspeaker module arranged in the equipment shell is in butt joint communication with the front sound outlet, the sound leakage hole is in butt joint communication with the rear sound outlet, the loudspeaker monomer is arranged in the installation space of the module shell, the effective volume from the first side of the vibrating diaphragm of the loudspeaker monomer to the path of the sound outlet forms a front sound cavity, the effective volume from the second side of the vibrating diaphragm to the path of the sound leakage hole forms a rear sound cavity, and the volume V1 of the front sound cavity and the volume V2 of the rear sound cavity are controlled to meet the relational expression: V1/V2 is not less than 0.42 and not more than 2.5, so when the vibrating diaphragm vibrates to produce sound, the amplitude of the signals sent to the front sound cavity and the amplitude of the signals sent to the rear sound cavity are consistent, and the phases of the signals are opposite, for a user using the intelligent head-mounted equipment, the sound waves belong to spherical waves, based on the front sound outlet close to the loudspeaker module, the intensity of the sound waves generated by the loudspeaker module is high, the mutual cancellation effect between the sound waves sent by the front sound outlet and the rear sound outlet is relatively unobvious, and the sound heard by the user is not completely cancelled, so that the auditory sensibility can be improved; as for the rear sound outlet far away from the speaker module, the phase angle of the far end of the sound wave is large, so that the sound wave offset effect is obvious, and the sound is gradually weakened from the sound hole at one end close to the speaker module to the sound hole at one end far away from the speaker module, so that a user can obtain more balanced sound quality; meanwhile, for other people far away from the user, the sound wave offset effect of the rear sound outlet is more obvious, so that the sound heard by other people far away from the user is smaller, and the individual privacy of the user is effectively protected.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an intelligent head-mounted device according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a speaker module according to an embodiment of the present invention;
FIG. 3 is a graph comparing FR curves of different volume ratios of the front acoustic cavity and the rear acoustic cavity in the intelligent head-mounted device according to the present invention;
fig. 4 is a graph comparing FR curves (side 30cm leakage) of different volume ratios of the front acoustic cavity and the rear acoustic cavity in the smart headset of the present invention.
The reference numbers illustrate:
reference numerals
Name (R)
Reference numerals
Name (R)
100
Intelligent head-mounted equipment
2112
Side plate
1
Equipment casing
2113
Sound outlet
11
Front sound outlet
2114
Sound release hole
12
Rear sound outlet
212
Lower casing
2
Loudspeaker module
22
Loudspeaker monomer
21
Module shell
221
Vibrating diaphragm
21a
Installation space
23
Front acoustic cavity
211
Upper casing
24
Rear acoustic cavity
2111
Base plate
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
Also, the meaning of "and/or" and/or "appearing throughout is meant to encompass three scenarios, exemplified by" A and/or B "including scenario A, or scenario B, or scenarios where both A and B are satisfied.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Along with the development of scientific technology, intelligent wearing equipment has brought very big facility for people's life, and the intelligence head-mounted equipment that is as intelligent wearing equipment also more and more popular, and intelligent head-mounted equipment can be regarded as a miniature intelligent equipment, and it has corresponding collection, processing or the function of demonstration data. The user can install programs provided by software service providers such as software and games in the intelligent head-mounted equipment, can also complete functions of adding schedules, map navigation, interacting with friends, taking pictures and videos, developing video calls with friends and the like through voice or action control, and can realize wireless network access through a mobile communication network.
It can be understood that the speaker module in the smart headset (e.g. the emerging smart headset electronic products such as AR/VR/XR/MR) is indispensable as an audio device. In current intelligent audio equipment, the speaker module that conventional (like the cell-phone) used generally is the design of closing the chamber, but closes the chamber speaker module and exists resonant frequency height, low frequency sensitivity low, leak the sound and heavily wait the problem. Because use scene and audio equipment design difference, for example be applied to intelligent audio equipment in fields such as AR/VR XR MR, experience for satisfying consumer's listening sense, the speaker module need design great back cavity so that obtain higher low frequency sensitivity, but great back cavity needs more casing or complete machine structure to satisfy. Based on the use characteristics of light weight and small size of a wearable product, a larger rear cavity designed on the whole machine violates the design direction of the whole machine and the requirements of a user.
In the related art, a speaker module on an intelligent head-mounted device is usually provided with an open rear cavity (the rear cavity of the module is open and is communicated with outside air) to realize optimal use of audio performance. The design of sound dipole is all adopted in order to reduce the far field of sound to leak to intelligent head-mounted apparatus, but adopts the dipole effect design, and the intelligent head-mounted apparatus of the open back chamber simultaneously can have following shortcoming: the leakage of external sound is serious, the personal privacy is not effectively protected, and the use effect of a user is influenced; due to the acoustic dipole effect and the difference of the front and rear acoustic cavity structures, the high-frequency cut-off frequency of the rear acoustic cavity moves forward, the integral bandwidth of the FR is narrowed, the auditory sensibility of consumers is reduced, and meanwhile, the debugging difficulty is increased for the sound debugging of the whole machine. It is important to reduce the noise leakage and widen the FR bandwidth of the product.
Based on the above-mentioned concepts and problems, the present invention proposes an intelligent headset 100. It is understood that the smart headset 100 may be AR/VR/XR/MR, etc., and is not limited thereto. The present invention is described by taking smart glasses as an example.
Referring to fig. 1 and fig. 2 in combination, in the embodiment of the present invention, the smart headset 100 includes a device housing 1 and a speaker module 2 installed in the device housing 1, the device housing 1 is provided with a front sound outlet 11 and a rear sound outlet 12, a distance between the rear sound outlet 12 and an ear hole of a wearer is greater than a distance between the front sound outlet 11 and the ear hole of the wearer, the speaker module 2 includes a module housing 21 and a speaker unit 22, wherein an installation space 21a is provided in the module housing 21, the module housing 21 is provided with a sound outlet 2113 and a sound outlet 2114, the sound outlet 2113 is in butt-joint communication with the front sound outlet 11, the sound outlet 2114 is in butt-joint communication with the rear sound outlet 12, the speaker unit 22 is disposed in the installation space 21a, the speaker unit 22 includes a vibrating diaphragm 221 capable of vibrating and generating sound, an effective volume on a path from a first side of the vibrating diaphragm 221 to the sound outlet 2113 forms a front sound cavity 23, the effective volume on the path from the second side of the diaphragm 221 to the sound outlet 2114 forms the rear acoustic chamber 24; wherein, the volume V1 of the front sound cavity 23 and the volume V2 of the rear sound cavity 24 satisfy the relation: V1/V2 is more than or equal to 0.42 and less than or equal to 2.5.
In this embodiment, an installation cavity is formed in the device housing 1 of the smart headset 100, and the speaker module 2 is installed in the installation cavity of the device housing 1. The device shell 1 is also provided with a front sound outlet 11 and a rear sound outlet 12, namely the front sound outlet 11 and the rear sound outlet 12 are communicated with the installation cavity. It can be understood that the smart headset 100 is exemplified by glasses, and when the smart headset 100 is worn by a wearer, a distance between the rear sound outlet 12 and an ear hole of the wearer on the device housing 1 is greater than a distance between the front sound outlet 11 and the ear hole of the wearer.
As shown in fig. 1 and 2, in the present embodiment, the speaker module 2 includes a module case 21 and a speaker unit 22, the module case 21 is provided with a mounting space 21a, and a sound outlet hole 2113 and a sound leakage hole 2114 communicating with the mounting space 21a, and the mounting space 21a is used for mounting, fixing and supporting the speaker unit 22. It can be understood that, when the speaker module 2 is installed in the installation cavity of the device housing 1, the sound outlet 2113 of the module housing 21 is in butt joint communication with the front sound outlet 11, and the sound outlet 2114 of the module housing 21 is in butt joint communication with the rear sound outlet 12, so that when the diaphragm 221 of the speaker unit 22 vibrates to produce sound, the sound can be transmitted to the outside through the sound outlet 2113, the front sound outlet 11, the sound outlet 2114 and the rear sound outlet 12.
It can be understood that when the speaker unit 22 is installed in the installation space 21a of the module housing 21, the effective volume on the path from the first side of the diaphragm 221 to the sound outlet 2113 forms the front sound cavity 23, and the effective volume on the path from the second side of the diaphragm 221 to the sound outlet 2114 forms the rear sound cavity 24. Thus, when the diaphragm 221 vibrates to generate sound, the sound can be transmitted to the outside through the front sound cavity 23, the sound outlet 2113 and the front sound outlet 11 in sequence, and the sound can be transmitted to the outside through the rear sound cavity 24, the sound outlet 2114 and the rear sound outlet 12 in sequence.
In the present embodiment, the relationship is satisfied by setting and defining the volume V1 of the front sound chamber 23 and the volume V2 of the rear sound chamber 24: V1/V2 is more than or equal to 0.42 and less than or equal to 2.5, so that when the diaphragm 221 vibrates to produce sound, the signals are respectively sent to the front sound cavity 23 and the rear sound cavity 24, wherein the amplitudes of the signals are consistent, and the phases of the signals are opposite. Because the sound waves belong to spherical waves, for a wearer using the intelligent head-mounted device 100, the sound waves are close to the front sound outlet 11 of the speaker module 2, the intensity of the sound waves generated by the speaker module 2 is high, the mutual cancellation effect between the sound waves emitted by the front sound outlet 11 and the sound waves emitted by the rear sound outlet 12 is relatively unobvious, and the sound heard by the wearer is not completely cancelled, so that the auditory sensibility can be improved; for the rear sound outlet 12 far away from the speaker module 2, the phase angle of the far end of the sound wave is large, so that the sound wave cancellation effect is obvious, and the sound is gradually weakened from one end close to the speaker module 2 to one end far away from the speaker module 2, so that a user can obtain more balanced sound quality; meanwhile, for other people far away from the wearer, the sound wave cancellation effect of the rear sound outlet hole 12 is more obvious, so that the sound heard by other people far away from the wearer is smaller, and the individual privacy of the user is effectively protected. Alternatively, the ratio of the volume V1 of the front acoustic chamber 23 to the volume V2 of the rear acoustic chamber 24 may be selected to be 0.42, 0.83, 1, 1.2, 1.5, 1.8, 2, 2.3, 2.5, etc., and is not limited herein.
The intelligent head-mounted device 100 of the present invention, by limiting the distance between the rear sound outlet 12 and the ear hole of the wearer on the device housing 1 to be greater than the distance between the front sound outlet 11 and the ear hole of the wearer, enables the sound outlet 2113 on the module housing 21 of the speaker module 2 disposed in the device housing 1 to be in butt-joint communication with the front sound outlet 11, and the sound outlet 2113 to be in butt-joint communication with the rear sound outlet 12, thereby disposing the speaker unit 22 in the mounting space 21a of the module housing 21, enabling the effective volume on the path from the first side of the diaphragm 221 to the sound outlet 2113 of the speaker unit 22 to form the front sound cavity 23, and the effective volume on the path from the second side of the diaphragm 221 to the sound outlet 2114 to form the rear sound cavity 24, thereby controlling the volume V1 of the front sound cavity 23 and the volume V2 of the rear sound cavity 24 to satisfy the relationship: V1/V2 is not less than 0.42 and not more than 2.5, so when the diaphragm 221 vibrates to produce sound, the signal amplitudes of the sound waves emitted to the front sound cavity 23 and the back sound cavity 24 are consistent, and the phases of the signals are opposite, for a wearer using the intelligent head-mounted device 100, the sound waves belong to spherical waves, based on the front sound outlet 11 close to the loudspeaker module 2, the intensity of the sound waves generated by the loudspeaker module 2 is large, the mutual cancellation effect is relatively unobvious, and the sound heard by the wearer is not completely cancelled, so that the auditory perception can be improved; as for the rear sound outlet 12 far away from the speaker module 2, the phase angle of the far end of the sound wave is large, so that the sound wave cancellation effect is obvious, and the sound is gradually weakened from the sound hole at the end close to the speaker module 2 to the sound hole at the end far away from the speaker module 2, so that a wearer can obtain more balanced sound quality; meanwhile, for other people far away from the wearer, the sound wave cancellation effect of the rear sound outlet hole 12 is more obvious, so that the sound heard by other people far away from the wearer is smaller, and the individual privacy of the user is effectively protected.
In this embodiment, as shown in fig. 1, the device case 1 of the smart headset 100 may be a temple case, and the smart headset 100 further includes a frame for fixing a lens. It can be understood that the frame is movably connected with the temple shell, and the temple shell can be folded relative to the frame, so that the temple shell is convenient to store. In general, the smart headset 100 has two lenses and two temple housings symmetrically disposed, and the two lenses are fixed by a frame. At this time, the front sound outlet 11 and the rear sound outlet 12 are symmetrically provided on the two temple housings.
In an embodiment, the front sound outlet 11 and the rear sound outlet 12 are configured to form an acoustic dipole effect when the smart wearable device sounds.
It can be understood that, intelligent head-mounted device 100 sets up speaker module 2 through the installation cavity in equipment housing 1, has realized the open coupling of speaker module 2 with the person's of wearing earhole, compares the airtight coupling form of pleasant formula, and convenient comfortable and the structure simplification is worn to open coupling, and the appearance is pleasing to the eye to the person of wearing can the external dynamic of real-time perception, has improved the security when this intelligent head-mounted device 100 uses.
However, the disadvantage of this open coupling is also obvious, and since the sound source is diffused outwards, people around the wearer can also hear the sound emitted by the speaker module 2 of the smart headset 100, which is not favorable for protecting the personal privacy of the wearer on one hand, and can cause interference to others on the other hand.
The present invention opens the front sound hole 11 at the position communicating with the front sound cavity 23 of the speaker module 2, and opens the rear sound hole 12 at the position communicating with the rear sound cavity 24 of the speaker module 2, because the front sound cavity 23 and the rear sound cavity 24 are respectively located at the two sides of the diaphragm of the speaker module 2, for example, when the diaphragm 221 vibrates towards the front sound cavity 23, the air of the front sound cavity 23 is compressed, and the air of the rear sound cavity 24 is just expanded, therefore, the sound source of the front sound cavity 23, i.e. the front sound hole 11, is opposite in phase to the sound source of the rear sound cavity 24, i.e. the rear sound hole 12, forming a positive and negative sound pressure phase, which is equivalent to forming a sound dipole effect, so-called sound dipole is two sound sources which are very close, and their vibration amplitudes are the same, but the phases are opposite, the synthesized sound source formed by such two point sound sources is called a sound dipole, and the intelligent head device 100 of the present invention utilizes the inverse potential drop leakage principle of the sound dipole, the sound emitted by the two sound sources of the front sound outlet 11 and the rear sound outlet 12 is mutually offset at a distance, so that the purpose of leakage reduction is achieved.
It will be understood that the conditions for the front sound outlet 11 and the rear sound outlet 12 to form the acoustic dipole effect are as follows: the distance between the front sound outlet hole 11 and the rear sound outlet hole 12 is far smaller than the distance between the front sound outlet hole 11 and the rear sound outlet hole 12 and the ear holes of the people around the wearer, so that the distance between the front sound outlet hole 11 and the rear sound outlet hole 12 can be ignored for the ear holes of the people around the wearer, that is, the distances between the two sound sources of the front sound outlet hole 11 and the rear sound outlet hole 12 and the ear holes of the people around the wearer are approximately equal, therefore, the two sound sources with opposite phases offset each other when reaching the ear holes of the people around the wearer, and the purpose of leakage reduction is achieved.
For the wearer, the sound waves in the opposite phase from the rear sound outlet 12 have a function of attenuating the loudness of sound received by the ears of the wearer, that is, the sound waves emitted from the rear sound outlet 12 partially cancel the sound waves emitted from the front sound outlet 11, thereby affecting the listening effect of the wearer; in order to reduce the effect of this attenuation, the present inventors have found that the distance from the rear sound outlet 12 to the human ear needs to be greater than the distance from the front sound outlet 11 to the human ear, that is, the distance between the rear sound outlet 12 and the ear hole of the wearer is greater than the distance between the front sound outlet 11 and the ear hole of the wearer.
In one embodiment, the volume V1 of the front acoustic cavity 23 satisfies the relationship: v1 is more than or equal to 0.18cc and less than or equal to 0.48 cc.
In the present embodiment, the volume ratio of the front acoustic cavity 23 to the rear acoustic cavity 24 is adjusted (i.e., the volume size of the front acoustic cavity 23/the rear acoustic cavity 24 is changed), and the volume size of the front acoustic cavity 23 is defined at the same time, so as to improve the sound leakage of the smart headset 100 and widen the high-frequency cut-off frequency.
The intelligent head-mounted device 100 uses VR glasses as an example, generally, the size of the product in the width direction is less than or equal to 10mm, the size of the product in the length direction is less than or equal to 26mm, and the amplitude X of the loudspeaker module 2 in the conventional VR glasses is used for pursuing the design requirements of portability and glasses legsmaxTypically between 0.4 and 0.65mm (X)maxToo large, which will cause the thickness of the product to be thickened and affect the weight and wearing comfort of the intelligent head-wearing device 100), so as to infer that the volume of the front acoustic cavity 23 is less than or equal to 0.48 cc; on the other hand, the size of the product in the width direction is more than or equal to 7mm, and the product in the length directionThe size is more than or equal to 15mm, so that the volume of the front sound cavity 23 is more than or equal to 0.18cc, and the volume (namely V1) of the front sound cavity 23 is limited to be more than or equal to 0.18cc and less than or equal to V1 and less than or equal to 0.48cc (the range fluctuates according to the size difference of the product size). Regarding the rear acoustic cavity 24, generally, the rear acoustic cavity 24 of the speaker module 2 is composed of the rear cavity of the speaker unit 22 itself and the cavity composed of the module housing 21, for the speaker unit 22 with the limited size of 15 × 7, the size of the rear acoustic cavity 24 inside the speaker module 2 is 0.2cc, so the rear acoustic cavity 24 should be greater than or equal to 0.2cc, and the volume ratio of the front acoustic cavity 23 to the rear acoustic cavity 24 (i.e., the volume of the front acoustic cavity 23 is marked as V1, and the volume of the rear acoustic cavity 24 is marked as V2) is not less than 0.42V 1/V2 not more than 2.5 (the volume of the rear acoustic cavity 24 is in a large relation with the overall size, and the specific limitation of the maximum value of the rear acoustic cavity 24 is not made herein, generally, the environmental noise standard 40dB identified in the industry is a critical point, and is artificially acceptable below 40dB, based on the practical simulation of the present invention, before 1, it is less than 40dB, and when the lower limit value of V1/V2 is 0.42), the sound leakage amount is small.
In one embodiment, the volume V1 of the front acoustic chamber 23 and the volume V2 of the rear acoustic chamber 24 satisfy the relationship: V1/V2 is 1. Specifically, when the volume ratio V1/V2 is 1, the sound leakage amount is optimum, and the high-frequency cutoff frequency can be effectively widened.
In one embodiment, the distance between the front sound outlet 11 and the rear sound outlet 12 is less than 50mm, the distance between the rear sound outlet 12 and the ear hole of the wearer is a first distance, the distance between the front sound outlet 11 and the ear hole of the wearer is a second distance, and the difference between the first distance and the second distance is greater than 5 mm.
It will be appreciated that it is desirable for the wearer to have as small a sound leakage as possible, i.e. to have an acoustic dipole effect between the rear sound outlet 12 and the front sound outlet 11, which requires that the distance between the rear sound outlet 12 and the front sound outlet 11 is not too great, and that the sound leakage cancellation effect is best when the distance between the rear sound outlet 12 and the front sound outlet 11 is less than 50mm, as is the case in practical use of the spectacles. Optionally, the distance between the front sound outlet 11 and the rear sound outlet 12 is less than 30 mm.
Meanwhile, it is found that the distance between the rear sound outlet 12 and the ear hole of the wearer is a first distance, the distance between the front sound outlet 11 and the ear hole of the wearer is a second distance, and when the difference between the first distance and the second distance is greater than 5mm, the two sound sources of the front sound outlet 11 and the rear sound outlet 12 do not satisfy the condition of forming the acoustic dipole effect with respect to the ear hole of the wearer, so that the influence on the wearer can be reduced. That is, for the people around the wearer, the two sound sources of the front sound outlet 11 and the rear sound outlet 12 form an acoustic dipole effect to reduce the sound leakage; the two sound sources of the front sound outlet 11 and the rear sound outlet 12 cannot form an acoustic dipole effect for the wearer, so as not to affect the listening effect of the wearer.
In one embodiment, the module case 21 includes an upper case 211 and a lower case 212, the upper case 211 includes a bottom plate 2111 horizontally disposed and a side plate 2112 disposed around the bottom plate 2111 and extending toward the lower case 212, the lower case 212 is hermetically connected to the side plate 2112, and the sound outlet hole 2113 and the sound discharge hole 2114 are respectively disposed on two opposite side walls of the side plate 2112.
It is understood that the upper case 211 and the lower case 212 of the module housing 21 may be detachably connected, so that the speaker unit 22 can be easily disassembled. As shown in fig. 2, the upper case 211 includes a bottom plate 2111 disposed horizontally and a side plate 2112 disposed around the bottom plate 2111 and extending toward the lower case 212, the lower case 212 is hermetically connected to the side plate 2112, and the sound outlet hole 2113 and the sound discharge hole 2114 are respectively disposed on two opposite side walls of the side plate 2112.
In the present embodiment, a side of the diaphragm 221 of the speaker unit 22 facing the bottom plate 2111 of the upper case 211 is a first side, and a side of the diaphragm 221 of the speaker unit 22 facing the lower case 212 is a second side. The diaphragm 221, the bottom plate 2111 and a part of the side plate 2112 enclose to form a front sound cavity 23 communicated with the sound outlet 2113, and the diaphragm 221, the lower shell 212 and a part of the side plate 2112 enclose to form a rear sound cavity 24 communicated with the sound outlet 2114. It will be understood that the periphery of the speaker unit 22 is connected to the side plate 2112 of the module case 21 so that the diaphragm 221 divides the mounting space 21a into the front and rear acoustic chambers 23 and 24 which face away from each other.
In one embodiment, the bottom plate 2111 includes a body and a metal plate, the body is a plastic member, and the plastic member and the metal plate are integrally injection molded. It can be understood that, by arranging the bottom plate 2111 as a body and a metal sheet, and then using the plastic part of the body and the metal sheet for integral injection molding, the sheet structure of the metal sheet can be used to increase the volume of the front acoustic cavity 23, and the volume V1 of the front acoustic cavity 23 and the volume V2 of the rear acoustic cavity 24 are effectively adjusted and controlled to satisfy the relation: V1/V2 is more than or equal to 0.42 and less than or equal to 2.5, so that the leakage sound of the intelligent head-mounted equipment 100 is improved, and the high-frequency cut-off frequency is widened.
In one embodiment, the vibration system and the magnetic circuit system of the speaker unit 22 together define a first inner cavity, the housing of the speaker unit 22 together with the side plate 2112 and the lower shell 212 respectively define a second inner cavity, and the first inner cavity and the second inner cavity are communicated to form the rear acoustic cavity 24.
It can be understood that, by communicating the first inner cavity formed in the speaker unit 22 with the second inner cavity formed by enclosing the housing of the speaker unit 22 with the side plate 2112 and the lower shell 212 of the device case 1, and jointly forming the rear sound cavity 24, the volume of the first inner cavity defined by the vibration system and the magnetic circuit system of the speaker unit 22 can be changed, so as to cause the change of the volume difference between the front sound cavity 23 and the rear sound cavity 24, or by arranging the speaker modules 2, the volume of the second inner cavity formed by enclosing the housing of the speaker unit 22 with the side plate 2112 and the lower shell 212 of the device case 1 can be changed, so as to cause the change of the volume difference between the front sound cavity 23 and the rear sound cavity 24.
In an embodiment, the speaker module 2 further includes a first auxiliary housing, the first auxiliary housing is disposed in the installation space 21a and defines a first auxiliary cavity with an inner wall of the front acoustic cavity 23, and the first auxiliary cavity is communicated with the front acoustic cavity 23 through the first ventilation micro-hole.
It can be understood that, by providing the first auxiliary housing in the front acoustic cavity 23, the first auxiliary housing and the inner wall of the front acoustic cavity 23 define a first auxiliary cavity, and communicate the first auxiliary cavity and the front acoustic cavity 23 through the first ventilation micro-hole, so as to adjust the volume V1 of the front acoustic cavity 23 by using the first auxiliary housing, so as to control the volume V1 of the front acoustic cavity 23 and the volume V2 of the rear acoustic cavity 24 to satisfy the relation: V1/V2 is more than or equal to 0.42 and less than or equal to 2.5, so that the leakage sound of the intelligent head-mounted equipment 100 is improved, and the high-frequency cut-off frequency is widened.
In an embodiment, the speaker module 2 further includes a second auxiliary housing, the second auxiliary housing is disposed in the mounting space 21a and defines a second auxiliary cavity with the inner wall of the rear acoustic cavity 24, and the second auxiliary cavity is communicated with the rear acoustic cavity 24 through a second ventilation micro-hole.
It can be understood that, by providing the second auxiliary housing in the rear acoustic cavity 24, the second auxiliary housing and the inner wall of the rear acoustic cavity 24 define a second auxiliary cavity, and communicate the second auxiliary cavity and the rear acoustic cavity 24 through the second ventilation micro-hole, so as to adjust the volume V2 of the rear acoustic cavity 24 by using the second auxiliary housing, so as to control the volume V1 of the front acoustic cavity 23 and the volume V2 of the rear acoustic cavity 24 to satisfy the following relation: V1/V2 is more than or equal to 0.42 and less than or equal to 2.5, so that the leakage sound of the intelligent head-mounted equipment 100 is improved, and the high-frequency cut-off frequency is widened.
In one embodiment, the speaker module 2 further includes a sound absorbing member disposed in the front acoustic chamber 23 and/or the rear acoustic chamber 24 to adjust a volume ratio of the front acoustic chamber 23 to the rear acoustic chamber 24.
It is understood that the sound absorbing member is disposed in the front sound cavity 23 and/or the rear sound cavity 24 by disposing the sound absorbing member so that the volume ratio of the front sound cavity 23 to the rear sound cavity 24 is adjusted so that the volume V1 of the front sound cavity 23 and the volume V2 of the rear sound cavity 24 satisfy the relation: V1/V2 is more than or equal to 0.42 and less than or equal to 2.5, so that the leakage sound of the intelligent head-mounted equipment 100 is improved, and the high-frequency cut-off frequency is widened. Optionally, the sound absorbing member is provided in the front acoustic cavity 23; alternatively, the sound absorbing member is disposed in the rear acoustic cavity 24; alternatively, the sound absorbing member is provided in the front and rear sound cavities 23 and 24, which is not limited herein.
In one embodiment, the lower shell 212 is provided with a convex hull structure protruding toward the direction close to the speaker unit 22, so that the volume ratio of the front sound cavity 23 to the rear sound cavity 24 can be adjusted by the convex hull structure, so that the volume V1 of the front sound cavity 23 and the volume V2 of the rear sound cavity 24 satisfy the following relation: V1/V2 is more than or equal to 0.42 and less than or equal to 2.5, so that the leakage sound of the intelligent head-mounted equipment 100 is improved, and the high-frequency cut-off frequency is widened. To better verify the effect of the volume ratio between the front cavity 23 and the rear cavity 24 on the sound leakage and the bandwidth, as shown in fig. 3 and 4, the ratio between the volume V1 of the front cavity 23 and the volume V2 of the rear cavity 24 was set to 0.42, 0.83, and 1, respectively, and the ratio was tested to find that two resonance peaks appear at high frequency, so that the bandwidth of the high frequency is narrowed. It was found that the first resonant peak at high frequency is the result of the high frequency resonance of the rear cavity 24 and the second resonant peak is the result of the high frequency resonance of the front cavity 23. Further, the following detailed verification is made in connection with the practice, as shown in fig. 3 and 4.
The speaker module 2, especially the open speaker module 2 applied to the smart headset 100, is limited by the design requirements of the whole device, has smaller general size, and generally designs the amplitude X to obtain high sensitivitymaxIs relatively large. X of general designmaxNot less than 0.4mm, the volume of the front acoustic cavity 23 corresponding to the speaker module 2 needs not less than 0.18cc, and the general conventional design is that the volume of the rear acoustic cavity 24 of the speaker module 2 is larger than the volume of the front acoustic cavity 23 of the speaker module 2 (for example, the volume of the front acoustic cavity 23 is 0.2cc, and the volume of the rear acoustic cavity 24 is 0.48cc), because the intelligent head-mounted device 100 adopts the acoustic dipole design, the Fh of the speaker module 2 of the open rear acoustic cavity 24 moves forward, and the sound leakage is relatively large.
In the invention, by reducing the volume of the rear sound cavity 24 of the loudspeaker module 2 (the volume of the front sound cavity 23 is 0.2cc, and the volume of the rear sound cavity 24 is 0.21cc), the volume of the front sound cavity 23 is close to that of the rear sound cavity 23, namely, the ratio of the volume V1 of the front sound cavity 23 to the volume V2 of the rear sound cavity 24 is V1/V2 is about 1, and through finite element simulation, the Fh of the rear sound cavity 24 can be moved backwards to be close to the front sound cavity 23, so that the frequency band is widened, the sound debugging of the whole machine is facilitated, meanwhile, the sound leakage of a product is effectively reduced, and the sound leakage test is reduced by 5dB compared with the conventional scheme. Actual verification is performed and the results of the verification (as shown in fig. 3 and 4) confirm the simulation conclusions.
Based on the above thought, whether the volume of the front acoustic cavity 23 continues to be increased or not is effective, and practical simulation verifies that when the volume V1 of the front acoustic cavity 23 is increased to 0.4cc, the volume V2 of the rear acoustic cavity 24 is unchanged, and the volume ratio V1/V2 of the front acoustic cavity 23 to the rear acoustic cavity 24 is about 0.83 (between 0.4 and 1), it is found through finite element simulation and practical verification that the high-frequency cutoff frequency can be effectively widened compared with the conventional scheme, and the sound leakage is reduced compared with the conventional scheme. As can be seen from fig. 3 and 4, the conventional design (i.e., 0.42V 1/V2) has the most severe leakage when the FR curves are similar. After 800Hz, the frequency band and the sound leakage of the normal conversation of people are smaller than those of the conventional scheme design, so that the privacy of a user can be effectively improved; fh is higher than the conventional design, and convenience is brought to tone quality adjustment by using Smart PA and the like.
In summary, it is verified that when the volume V1 of the front acoustic chamber 23 is limited to 0.18cc or less and V1 or less and 0.48cc or less, and the volume ratio V1/V2 of the front acoustic chamber 23 to the rear acoustic chamber 24 is 1, the sound leakage amount is minimized and the high-frequency cutoff frequency is maximized. Generally, the difference of FR curves is more than or equal to 3dB, so that people can recognize the FR curves and feel the obvious change of sound. The invention can reduce 5dB, thereby effectively improving personal privacy.
In other embodiments, the volume ratio between the front acoustic chamber 23 and the rear acoustic chamber 24 can be adjusted by changing the area of the rear sound outlet 12, the length of the duct of the rear sound outlet 12, and the like. The volume ratio between the front acoustic chamber 23 and the rear acoustic chamber 24 can also be adjusted by performing the arrangement of the speaker modules 2, such as the design of the array of the speaker modules 2, which is not particularly limited by the present invention.
It can be understood that, open speaker module 2 design among the intelligent head-mounted device 100 because the influence of sound dipole effect, through the size of adjusting preceding sound chamber 23 and back sound chamber 24 volume, can effectively improve lou sound, improves the privacy that the consumer used to widen the cut-off frequency of high frequency, be favorable to the tone quality regulation of complete machine.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
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