Electronic device with speaker module

Abstract

The application discloses an electronic device, which comprises a shell, a cavity and a first output port, the first output port being in communication with the cavity and the outside of the shell; and a speaker module arranged in the cavity. The speaker module comprises a first front cavity in communication with the first output port, a second front cavity in acoustic connection with the internal space of the shell, a rear cavity, a transducer arranged between the first front cavity and the rear cavity, and a first passive radiator arranged between the second front cavity and the rear cavity. The passive radiator can radiate low-frequency sound to the internal space of the shell through the second front cavity and the internal port or the second passive radiator. The low-frequency sound is re-radiated to the external environment through the surface of the shell and possible leakage points in the shell, so that the low-frequency effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electro-acoustic transducer, in particular to an electronic device with a loudspeaker module. BACKGROUND

[0002] In a conventional loudspeaker module for a portable device (such as a mobile phone, a tablet / PAD, etc.), the back cavity of the module is usually sealed to prevent sound from being radiated from the back side of the loudspeaker module to the internal space of the portable device. However, due to the limitation of the basic principle of the portable device, it is difficult to achieve high efficiency and good extended low frequency response in a very small housing.

[0003] Therefore, it is desirable to provide an improved loudspeaker module for a portable electronic device. SUMMARY

[0004] The present application provides an electronic device, comprising: a housing, a chamber and a first output port being provided in the housing, the first output port communicating the chamber with the outside of the housing; and a loudspeaker module disposed in the chamber, the loudspeaker module comprising a first front cavity, a second front cavity, a back cavity, a transducer disposed between the first front cavity and the back cavity, and a first passive radiator disposed between the second front cavity and the back cavity, wherein the second front cavity is acoustically connected with the outside of the housing or an internal space of the housing, so that the first passive radiator is capable of radiating low frequency sound to the outside of the housing or the internal space of the housing through the second front cavity.

[0005] Preferably, the housing further comprises a second output port communicating the second front cavity with the outside of the housing, so that the first passive radiator is capable of radiating the low frequency sound to the outside of the housing through the second front cavity and the second output port.

[0006] Preferably, the loudspeaker module further comprises an internal port connecting the second front cavity and the internal space, so that the first passive radiator is capable of radiating the low frequency sound to the internal space of the housing through the second front cavity and the internal port.

[0007] Preferably, the housing further comprises an extension channel connected with the internal port, so that the first passive radiator is capable of radiating the low frequency sound to the internal space of the housing through the second front cavity, the internal port and the extension channel.

[0008] Preferably, the extension channel is formed by a hollow tube / conduit / pipeline.

[0009] Preferably, the speaker module further comprises a second passive radiator disposed between the second front cavity and the internal space of the housing, so that the low frequency sound is radiated to the internal space of the housing through the first passive radiator, the second front cavity and the second passive radiator.

[0010] Preferably, the first passive radiator and the second passive radiator are both vibratable diaphragms, and the first passive radiator and the second passive radiator are respectively disposed on opposite sides of the second front cavity.

[0011] Preferably, the electronic device is portable.

[0012] Preferably, the electronic device is a mobile phone or a tablet computer or PAD.

[0013] Preferably, the first passive radiator is a vibratable diaphragm.

[0014] The present application also provides a speaker module, comprising a first front cavity, a second front cavity, a rear cavity, a transducer disposed between the first front cavity and the rear cavity, and a first passive radiator disposed between the second front cavity and the rear cavity.

[0015] Preferably, the second front cavity is not sealed on a first side of the speaker module.

[0016] Preferably, the second front cavity is not sealed on a second side of the speaker module, the second side being opposite to the first side of the speaker module.

[0017] Preferably, the speaker module further comprises a second passive radiator, wherein the first passive radiator and the second passive radiator are both vibratable diaphragms, and the first passive radiator and the second passive radiator are respectively disposed on opposite sides of the second front cavity.

[0018] Preferably, the first passive radiator is a vibratable diaphragm.

[0019] The present application has the following beneficial effects: the first passive radiator can directly radiate low frequency sound to the internal space of the housing through the second front cavity and the internal port. Then, the low frequency sound is re-radiated to the outside of the housing through the surface of the housing and possible leakage points in the housing. The low frequency output will be excessively attenuated by the housing. The internal port is connected with the second front cavity. This newly added port-cavity combination forms a resonator, which has the following acoustic functions: expanding the output of the speaker module to the internal air space of the housing, compensating for the low frequency acoustic attenuation caused by the housing; at low frequencies, the acoustic inductance of the port coupled to the passive radiator makes the physical mass of the passive radiator slightly lower, which has advantages in mechanical design; due to the gain of the resonator, the displacement requirement of the passive radiator is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly explain the technical solutions of the embodiments of the present disclosure, the following will briefly introduce the drawings used to describe the embodiments. Obviously, the drawings in the following description only relate to some of the embodiments of the present disclosure. Those skilled in the art can obtain other drawings without creative effort based on these drawings.

[0021] Figure 1 The structure schematic diagram of the electronic device of the first embodiment of the present application;

[0022] Figure 2 The structure schematic diagram of the electronic device of the first embodiment of the present application; Figure 1 The structure schematic diagram of the speaker module in the electronic device shown in the figure;

[0023] Figure 3 The structure schematic diagram of the electronic device of the second embodiment of the present application;

[0024] Figure 4 The structure schematic diagram of the electronic device of the second embodiment of the present application; Figure 3 The structure schematic diagram of the speaker module in the electronic device shown in the figure;

[0025] Figure 5 The structure schematic diagram of the electronic device of the third embodiment according to the present application;

[0026] Figure 6 The structure schematic diagram of the speaker module in the electronic device of the fourth embodiment of the present application. DETAILED DESCRIPTION

[0027] The present application will be further described below with reference to the drawings. It should be noted that similar structures or functions of elements are denoted by similar reference numerals throughout the drawings. The embodiments described herein are not intended to be an exhaustive or complete description of various other embodiments or to be a limitation on the scope or the scope of some other embodiments obvious to those skilled in the art in view of the embodiments described in the present application. In addition, one illustrated embodiment does not necessarily have all the aspects or advantages shown.

[0028] Figure 1 The electronic device 10 shown in the first embodiment of the present application is shown in the figure. In the present application, the electronic device 10 is preferably a portable device, such as a mobile phone, a PAD, etc. The electronic device 10 includes a housing 20 and a speaker module 40 disposed in the housing 20.

[0029] The housing 20 is provided with a chamber 22, a first output port 24 and a second output port 26 connected to the outside of the housing 20. The speaker module 40 is housed in the chamber 22.

[0030] As shown in the figure, the speaker module 40 includes a speaker 42 and a sound guide 44. The sound guide 44 is disposed in the chamber 22 and is connected to the speaker 42. The sound guide 44 is provided with a first sound guide hole 44a and a second sound guide hole 44b. The first sound guide hole 44a and the second sound guide hole 44b are connected to the first output port 24 and the second output port 26, respectively. Figure 2As shown, the speaker module 40 includes a first front cavity 42 that is in communication with the outside of the housing 20 through the first output port 24, a second front cavity 44 that is in communication with the outside of the housing 20 through the second output port 26, a back cavity 46, a transducer 48 disposed between the first front cavity 42 and the back cavity 46, and a first passive radiator 50 disposed between the second front cavity 44 and the back cavity 46. Specifically, the first output port 24 and the second output port 26 are located at the front side of the speaker module 40 and are connected to the front side of the first front cavity 42 and the second front cavity 44, respectively. In this embodiment, the first output port 24 is a high frequency output port and the second output port 26 is a low frequency output port. The back side of the first front cavity 42 and the second front cavity 44 is sealed. In this embodiment, the front side and the back side of the first front cavity 42 and the second front cavity 44 are arranged along the longitudinal direction of the housing 20. The front cavity and the back cavity are arranged along the depth direction of the housing 20, which is perpendicular to the longitudinal direction of the housing 20.

[0031] In this embodiment, the transducer 48 includes a diaphragm 482 that is vibratable for converting an input electrical signal into a corresponding acoustic output signal. The first passive radiator 50 can be a diaphragm suspended between the second front cavity 44 and the back cavity 46. In operation, the vibratable diaphragm 482 driven by electrical power vibrates and excites the first front cavity 42 and the back cavity 46, thereby causing passive vibration of the first passive radiator 50. In this way, the first passive radiator 50 is able to directly radiate low frequency sound to the outside of the housing 20 through the second front cavity 44 and the second output port 26. This approach has been proven to produce good results.

[0032] Figure 3 An electronic device 10 according to a second embodiment of the present application is shown. Figure 4 An electronic device is shown. Figure 3 A speaker module of an electronic device is shown. In this embodiment, the housing 20 is provided with only one first output port 24, and there is no second output port 26 at the front side of the speaker module 40 as in the first embodiment. The speaker module 40 is provided with an internal port 28 that connects the second front cavity 44 with the internal space 29 of the housing 20 around the chamber 22. Preferably, the internal port 28 is located at the back side of the second front cavity 44. That is, the back side of the second front cavity 44 is not sealed.

[0033] In this embodiment, the first passive radiator 50 is able to directly radiate low frequency sound to the internal space 29 of the housing 20 through the second front cavity 44 and the internal port 28. Then, the low frequency sound is re-radiated to the outside of the housing 20 through the surface of the housing 20 and possible leak points in the housing 20. The low frequency output will be excessively attenuated by the housing 20. The internal port 28 is provided to connect the second front cavity 44. This newly added port-cavity combination forms a resonator with the following acoustic functions:

[0034] The output of the speaker module 40 is extended to the internal air space of the housing 20, compensating for the low frequency acoustic attenuation caused by the housing 20;

[0035] At low frequencies, the acoustic inductance coupled to the port of the first passive radiator 50 makes the physical mass of the first passive radiator 50 slightly lower, which has advantages in mechanical design;

[0036] The displacement requirement of the first passive radiator 50 is reduced due to the gain of the resonator;

[0037] The resonator attenuates higher frequencies propagating to the housing 20, which yields the following benefits: the high frequency sound pressure of the internal space of the housing 20 is reduced, thus the acoustic feedback to the speaker module 40 is reduced, and since the frequency response of the sound radiated through the housing is highly irregular at high frequencies due to mechanical resonances (amplitude response and polarity patterns), this acoustic filtering of higher frequencies is beneficial to form a smoother overall response.

[0038] In the present embodiment, the acoustic arrangement enables the housing 20 of the electronic device 10 to be used as a radiating surface for low frequencies radiated through the back side of the speaker module 40, while the high frequency content is radiated through the first output port 24 connected to the front side of the speaker module 40. The sound radiated from the back side of the speaker module 40 is shaped by using at least two acoustic resonators, such that at least one resonator uses the first passive radiator 50 to achieve the required low frequency resonance characteristics, which are much larger than the acoustic output of a sealed box at a given speaker driver displacement, while eliminating the need for a separate acoustic port in the outer cover for low frequencies. The performance of the present embodiment is also not degraded if there is sound leakage from the internal space / cavity of the housing 20 to the outside (the frequency response will change, but the leakage actually increases the output at the lowest frequencies).

[0039] Figure 5 is an electronic device 10 of a third embodiment of the present invention. In the present embodiment, the internal port 28 is connected with the extension channel 30, which is disposed within the internal space 29. The first passive radiator 50 can radiate low frequency sound to the internal space 29 of the housing 20 through the second front cavity 44, the internal port 28 and the extension channel 30. Then, the low frequency sound is re-radiated to the outside of the housing 20 through the surface of the housing 20 and possible leakage points in the housing 20. The first passive radiator 50, the second front cavity 44, the internal port 28 and the extension channel 30 act as multiple acoustic resonators for improving the low frequency sound radiated to the inside of the portable device. The extension channel 30 can be formed by a hollow tube / pipe / conduit.

[0040] While the above embodiments show only one passive radiator and one internal port, it is a simple extension of the principle to use multiple passive radiators and / or internal ports 28. Where mechanical design constraints permit, the lengths of the multiple ports can be chosen so that the longitudinal resonances are not at the same frequency, reducing the colouration of the sound, and the positions of the internal ports within the enclosure 20 can be chosen to reduce the excitation of standing waves within the enclosure 20. The internal ports 28 can take various shapes, such as folded or spiral configurations, to keep the size of the speaker module sufficiently compact.

[0041] Figure 6 A speaker module for an electronic device is schematically illustrated for a further embodiment of the present application. In this embodiment, a second passive radiator 52 is provided in place of the internal port 28 of the above embodiments to make it easier to tune to the desired frequency and to avoid the non-linearities associated with port flow. On the other hand, at higher tuning frequencies it is more practical to use a port / conduit as the higher tuning frequency will allow a practical port size (short and wide enough), whereas for the first resonator, which requires a lower tuning frequency, it is more practical to use only a passive radiator.

[0042] The above second and third embodiments have the following main advantages:

[0043] Increased low frequency output with reduced displacement compared to a speaker module sealed at its back;

[0044] No additional output port is required to output low frequencies;

[0045] Low frequency vibrations can be used to enhance haptic effects;

[0046] Given the reduced displacement of the low frequency sound output compared to a speaker module sealed at its back, the high frequency modulation distortion due to the diaphragm movement is also reduced.

[0047] The combined effect of the increased low frequency output and the significantly reduced displacement means that much greater acoustic output can be achieved from the embodiments of the present disclosure than from conventional sealed speaker modules in portable devices.

[0048] While the present application has been described with reference to one or more embodiments, the above description of the embodiments is not intended to limit or restrict the application. The scope of the application is set out in the following claims. Various modifications can be made to the embodiments described above without departing from the spirit or scope of the application. The embodiments described above should not be interpreted as limiting the scope of the present application, which is defined by the following claims.

Claims

1. An electronic device, comprising: It comprises: a housing having a cavity and a first output port that communicates the cavity with an exterior of the housing; and a speaker module disposed in the cavity, the speaker module including a first front cavity, a second front cavity, a back cavity, a transducer disposed between the first front cavity and the back cavity, and a first passive radiator disposed between the second front cavity and the back cavity, wherein the speaker module further includes an internal port that connects the second front cavity with an interior space of the housing, and the housing further includes an extended passage that is connected with the internal port to enable the first passive radiator to radiate low frequency sound to the interior space of the housing through the second front cavity, the internal port, and the extended passage. The extended passage is formed by a hollow tube / conduit / pipeline. The electronic device is portable.

2. The electronic device of claim 1, wherein, The electronic device is a mobile phone or a tablet computer or PAD.

3. The electronic device of claim 1, wherein, The first passive radiator is a vibratable diaphragm.

4. The electronic device of claim 1, wherein, ​ 5. The electronic device of claim 1, wherein, ​

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