Patent Description:
With the rapid development of an electronic industry, functions of smart phones are becoming increasingly powerful. Stereo is a development direction of the smart phones. A stereo effect in a specific scenario can be achieved by respectively configuring speakers at the bottom and at the top of the smart phone.

As the functions of the smart phones are becoming increasingly powerful, an increasing number of components need to be integrated into motherboards. However, an area of a motherboard is limited. Therefore, layout space for the components is becoming increasingly limited. In a current solution for achieving the stereo, there are two solutions for placing speakers at the top. (<NUM>) A single speaker is placed. A disadvantage of this solution is as follows. Because a rear cavity is open, a battery cover vibrates violently, bringing obvious vibration sense. Accordingly, user experience is affected. (<NUM>) A speaker assembly is placed. A disadvantage of this solution is as follows. If a reserved volume for a rear cavity is excessively small, performance of the speaker assembly in a low frequency will be excessively poor and a sound effect will be poor. If the reserved volume for the rear cavity is excessively large, valuable stacking space will be occupied, and an effective layout area of the motherboard will be reduced.

<CIT> discloses a mobile terminal, including a housing, a substrate, a middle frame, a speaker sound box and a screen assembly. The substrate includes a first surface, a second surface, and a positioning member; and the middle frame is disposed around the periphery of substrate. The middle frame and the substrate together form the middle frame structure of the mobile terminal. The middle frame is provided with an outer wall, which is disposed on the relatively short side of the substrate and is located on the side of the through hole. The outer wall is approximately perpendicular to the substrate. The outer wall is disposed relative to the positioning member, and the outer wall and the positioning member are located on opposite sides of the through hole. The outer wall is used to fix the installation position of the speaker sound box together with the positioning member, so that the speaker sound box can be disposed near the outer wall. Thus, the speaker sound box can be located on the end side of the entire mobile terminal (such as the top or bottom end of the mobile terminal).

<CIT> discloses a mobile terminal including a housing and a speaker assembly disposed in an inner cavity of the housing. The speaker assembly includes a speaker unit and a hollow accommodating cavity. The speaker unit is disposed in the accommodating cavity, the accommodating cavity is divided into a front cavity and a rear cavity, and the front sound cavity is communicated with the sound hole of the housing. The middle frame is located on the side of the mobile terminal, the rear cover is located on the side of the mobile terminal away from the screen, and the middle frame, the screen and the rear cover together form a closed structure of the mobile terminal. The speaker assembly, the rear cover and the support assembly are disposed on the side of the middle frame deviating from the screen, and the speaker assembly is located in the inner cavity of the housing formed by the rear cover and the middle frame. A gap of relatively uniform thickness may be formed between the inner walls of the housing.

<CIT> discloses a terminal including a housing, a first circuit board, a second circuit board, a speaker and an enclosing part. The first circuit board and the second circuit board opposite and have a spacing, and the second circuit board is provided with a through hole. The speaker is embedded in the through hole and electrically connected with the first circuit board, a front sound cavity is disposed between the sound surface of the speaker and the housing, and the front sound cavity is communicated with the sound outlet. The enclosure part is disposed between the first circuit board and the second circuit board around the speaker, and the first circuit board, the enclosure part and the second circuit board are enclosed to form a rear sound cavity.

Embodiments of this application are intended to provide an electronic device, which can resolve a problem that, in the prior art, reduction of space occupied by a speaker, improvement of sound quality of the speaker, and prevention of a bad phenomenon of vibration of a battery cover cannot be implemented simultaneously.

To resolve the foregoing technical problem, this application is implemented as follows.

An embodiment of this application provides an electronic device, including: a display module, a middle frame, a sound-emitting assembly, a first circuit board, a first structural member, and a back shell.

The middle frame is provided with an accommodating groove. The display module is disposed in the accommodating groove. The sound-emitting assembly, the first circuit board, the first structural member, and the back shell are disposed on a side, away from the display module, of the middle frame. The sound-emitting assembly, the first circuit board, and the first structural member are located in an installation cavity formed by the back shell and the middle frame.

The sound-emitting assembly includes a housing and a sound-emitting component. The housing is provided with a first cavity, and the sound-emitting component is located in the first cavity and divides the first cavity into a front cavity and a rear cavity. The housing is further provided with a first sound guide hole and a second sound guide hole. The first sound guide hole communicates with the front cavity, and the second sound guide hole communicates with the rear cavity.

The first structural member and the first circuit board form first space by enclosure. Either of the first structural member or the first circuit board is provided with a third sound guide hole. The rear cavity communicates with the first space through the second sound guide hole and the third sound guide hole.

There is a first gap between the first structural member and the back shell, and there is a second gap between the housing and the back shell.

Alternatively, there is a third gap between the display module and the middle frame. The third gap forms a sound guide channel, and the sound guide channel communicates with the first sound guide hole.

Alternatively, the electronic device further includes a first sealing member. The middle frame is connected to the housing through the first sealing member in a sealing manner.

Alternatively, the electronic device further includes a second sealing member. Either of the first structural member or the first circuit board provided with the third sound guide hole is connected to the housing through the second sealing member in a sealing manner.

Alternatively, the first structural member is provided with a leakage hole. The leakage hole communicates with the first space, and a damping mesh is disposed in the leakage hole.

Alternatively, the first structural member is connected to the first circuit board through an adapter board.

Alternatively, the electronic device further includes a second structural member and a flexible printed circuit board. The second structural member is disposed between the first structural member and the back shell. A connecting component is disposed on a contact surface, in contact with the housing, of the second structural member. The sound-emitting component is electrically connected to the connecting component. The connecting component is electrically connected to the second structural member. The second structural member is electrically connected to the first circuit board through the flexible printed circuit board.

Alternatively, a connecting component is disposed on a contact surface, in contact with the first circuit board, of the housing. The sound-emitting component is electrically connected to the connecting component, and the connecting component is electrically connected to the first circuit board.

Alternatively, the housing includes a first housing part and a second housing part connected to each other. The first housing part and the second housing part are in a shape of hollow cuboids. A thickness, in a thickness direction of the display module, of the first housing part, is greater than that, in the thickness direction of the display module, of the second housing part. The first sound guide hole is disposed in the first housing part, and the second sound guide hole is disposed in the second housing part.

Alternatively, the second housing part is located between the middle frame and the first circuit board. The second sound guide hole is disposed in a contact surface, in contact with the first circuit board, of the second housing part. The third sound guide hole is disposed in the first circuit board and opposite to the second sound guide hole.

Alternatively, the second housing part is located between the back shell and the first structural member. The second sound guide hole is disposed in a contact surface, in contact with the first structural member, of the second housing part. The third sound guide hole is disposed in the first structural member and opposite to the second sound guide hole.

In the embodiments of this application, an original frame board, a motherboard, and other components of the electronic device are used to form a closed sound cavity, reducing space occupied by a speaker and increasing a volume of the sound cavity. Therefore, performance of the speaker can be effectively increased, the sound quality can be improved, and the bad phenomenon of vibration of a battery cover caused by the speaker is prevented.

Apparently, the described embodiments are some rather than all of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by a person of ordinary skill in the art without creative efforts fall within the protection scope of this application.

Terms "first" and "second" in the specification and claims of this application are used to distinguish between similar objects, and do not need to be used to describe a specific order or sequence. It should be understood that, data used in such a way are interchangeable in proper circumstances, so that the embodiments of this application can be implemented in an order other than the order illustrated or described herein. Objects classified by "first", "second", and the like are usually of a same type, and the number of objects is not limited. For example, there may be one or more first objects. In addition, in the specification and the claims, "and/or" represents at least one of connected objects, and a character "/" generally represents an "or" relationship between associated objects.

With reference to the accompanying drawings, an electronic device provided in the embodiments of this application will be described in detail by using specific examples and application scenarios thereof.

<FIG> is a schematic diagram of an electronic device according to an embodiment of this application is provided. As shown in <FIG>, this embodiment of this application provides an electronic device. A sound-emitting component is placed at the top of the electronic device <NUM>. The sound-emitting component implements sound transmission on speaker through a third gap <NUM> of the electronic device <NUM>. In this embodiment of this application, by using an internal component of the electronic device <NUM> to form a cavity with a volume as a sound cavity of a speaker assembly, so that the volume of the placed speaker assembly may be reduced. Therefore, a stereo effect can be achieved without occupying excessively space or causing vibration of a battery cover. The electronic device <NUM> may be specifically a mobile phone, a tablet computer, or the like.

Refer to <FIG>, <FIG> is an exploded view of an electronic device according to an embodiment of this application, <FIG> is a schematic diagram of an installation position of a sound-emitting assembly according to an embodiment of this application, <FIG> is an exploded view of assemblies forming first space according to an embodiment of this application, <FIG> is a perspective view of a sound-emitting assembly according to an embodiment of this application, and <FIG> is a sectional view of a sound-emitting assembly according to an embodiment of this application. As shown in <FIG>, specifically, the electronic device <NUM> in the embodiments of this application may include a display module <NUM>, a middle frame <NUM>, a sound-emitting assembly <NUM>, a first circuit board <NUM>, a first structural member <NUM>, and a back shell <NUM>. The display module <NUM> is fixedly connected to a front surface of the middle frame <NUM>. More specifically, an accommodating groove is disposed in the middle frame <NUM>, and the display module <NUM> is disposed in the accommodating groove. The sound-emitting assembly <NUM>, the first circuit board <NUM>, the first structural member <NUM>, and the back shell <NUM> are all disposed on a side, away from the display module <NUM>, of the middle frame <NUM>. In addition, the back shell <NUM> and the middle frame <NUM> form an installation cavity by enclosure. The sound-emitting assembly <NUM>, the first circuit board <NUM>, and the first structural member <NUM> are all located in the installation cavity. Alternatively, the sound-emitting assembly <NUM> may include a housing <NUM> and a sound-emitting component <NUM>. A first cavity is formed in the housing <NUM>. The sound-emitting component <NUM> is located in the first cavity, and the sound-emitting component <NUM> divides the first cavity into two independent cavities, namely a front cavity <NUM> and a rear cavity <NUM>. In addition, a first sound guide hole <NUM> and a second sound guide hole <NUM> are further disposed in the housing <NUM>. The first sound guide hole <NUM> is connected to the front cavity <NUM>, and the second sound guide hole <NUM> is connected to the rear cavity <NUM>. To form a larger sound cavity, in the installation cavity formed by the middle frame <NUM> and the back shell <NUM>, the first structural member <NUM> and the first circuit board <NUM> form first space <NUM> by enclosure. Either of the first structural member <NUM> or the first circuit <NUM> is provided with a third sound guide hole <NUM>. The rear cavity <NUM> is connected to the third sound guide hole <NUM> through the second sound guide hole <NUM>. Therefore, the rear cavity <NUM> and the first space <NUM> form a sound cavity of the sound-emitting component <NUM>, to obtain a better sound effect. The third sound guide hole <NUM> may be disposed in either of the first structural member <NUM> or the first circuit board <NUM>, that is closer to the second sound guide hole <NUM>. For example, in an embodiment of this application, the first circuit board <NUM> is closer to the second sound guide hole <NUM>. Therefore, the third sound guide hole <NUM> is disposed in the first circuit board <NUM>. There is a first gap between the first structural member <NUM> and the back shell <NUM>, and there is a second gap between the housing <NUM> and the back shell <NUM>. Through isolation of the first gap and the second gap, the sound-emitting component <NUM> can work, without causing violent vibration of the back shell <NUM> and thereby affecting user experience.

In an embodiment of this application, the sound-emitting component <NUM> may be a speaker, the display module <NUM> may include a screen, the first structural member <NUM> is an internal structural member of the electronic device, specifically, may be another component such as a cover plate or a circuit board, and the back shell <NUM> may be a structural member such as a battery cover.

Alternatively, in an embodiment of this application, there is a third gap <NUM> between the display module <NUM> and the middle frame <NUM>, and the third gap <NUM> is formed as a sound guide channel. The sound guide channel is connected to the first sound guide hole <NUM>. Therefore, the sound-emitting component <NUM> can transmit sound to an outside of the electronic device <NUM> through the sound guide channel, thereby playing sound on speaker.

Accordingly, in the embodiments of this application, internal space of the electronic device <NUM> is reasonably utilized, and original components of the electronic device <NUM> are used to form the first space <NUM>, so that the original rear cavity <NUM> of the sound-emitting assembly <NUM> is connected to the first space <NUM>. Consequently, the sound-emitting assembly <NUM> may be designed to be smaller, but a volume of a sound cavity of the sound-emitting assembly <NUM> may still be increased by using the first space <NUM>. Therefore, performance is more excellent and a stereo effect is better, and there will be no great performance difference between a speaker at the top and a speaker at the bottom. In addition, because the first space <NUM> is not in contact with the back shell <NUM> fastened on a back of the middle frame <NUM>, a sound wave will hardly be transmitted to the back shell <NUM> when the speaker works, and a problem that violent vibration of the back shell <NUM> will not be caused and user experience is affected will not be generated.

In an embodiment of this application, alternatively, to ensure leakproofness between the sound-emitting assembly <NUM> and the back of the middle frame <NUM>, a first sealing member (not shown) is disposed between the housing <NUM> of the sound-emitting assembly <NUM> and a press-fit surface of the middle frame <NUM>. Therefore, under a press-fit force exerted by the sound-emitting assembly <NUM>, the first sealing member can provide a good sealing effect. For example, the first sealing member may be a sealing ring.

In an embodiment of this application, alternatively, to ensure leakproofness between the sound-emitting assembly <NUM>, and either of the first circuit board <NUM> or the first structural member <NUM> provided with the third sound guide hole, the electronic device <NUM> further includes a second sealing member <NUM>. Either of the first circuit board <NUM> or the first structural member <NUM> provided with the third sound guide hole is connected to the housing <NUM> through the second sealing member <NUM> in a sealing manner. Therefore, a good sealing effect can be provided by the first sealing member <NUM>. For example, the second sealing member may also be a sealing ring.

As shown in <FIG> and <FIG>, in an embodiment of this application, the housing <NUM> includes a first housing part <NUM> and a second housing part <NUM> are connected to each other. Both the first housing part <NUM> and the second housing part <NUM> are hollow cuboids, and may be designed as an integral structure. A thickness, in a thickness direction of the display module <NUM>, of the first housing part <NUM>, is greater than that, in the thickness direction of the display module <NUM>, of the second housing part <NUM>. That is, an internal cavity of the first housing part <NUM> is larger than that of the second housing part <NUM>. Therefore, as shown in <FIG>, a cross-sectional shape of the housing <NUM> is like a shape of a kitchen knife (that is, one vertex corner of a square or rectangle has a region extending outward), and the sound-emitting component <NUM> may be disposed in the first housing part <NUM>. That is, the first sound guide hole <NUM> is disposed in the first housing part <NUM>, and the second sound guide hole <NUM> is disposed in the second housing part <NUM>. As shown in <FIG>, in an alternative implementation, the second housing part <NUM> is located between the first circuit board <NUM> and the middle frame <NUM>. Because the thickness, in the thickness direction of the display module <NUM>, of the second housing part <NUM> is less than that, in the thickness direction of the display module <NUM>, of the first housing part <NUM>, the first circuit board <NUM> and the first structural member <NUM> can extend to a lower region of the second housing part <NUM>. Therefore, a stacking thickness of an internal assembly of the electronic device <NUM> is reduced, helping to reduce a thickness of the whole electronic device. In this case, the second sound guide hole <NUM> is disposed in a contact surface, in contact with the first circuit board <NUM>, of the second housing part <NUM>, while the third sound guide hole <NUM> is disposed in the first circuit board <NUM> and opposite to the second sound guide hole <NUM>, and the second sealing member <NUM> is disposed between the second housing part <NUM> and the first circuit board <NUM>.

In another alternative implementation, the second housing part <NUM> is located between the back shell <NUM> and the first structural member. That is, the sound-emitting assembly <NUM> is turned over by <NUM>°. In this case, only a position at which the first sound guide hole <NUM> is provided is moved to a symmetrical surface. Because the thickness, in the thickness direction of the display module <NUM>, of the second housing part <NUM> is less than that, in the thickness direction of the display module <NUM>, of the first housing part <NUM>, the first circuit board <NUM> and the first structural member <NUM> can extend to an upper region of the second housing part <NUM>. In this case, the second sound guide hole <NUM> is disposed in a contact surface, in contact with the first structural member <NUM>, of the second housing part <NUM>, while the third sound guide hole <NUM> is disposed in the first structural member <NUM> and opposite to the second sound guide hole <NUM>, and the second sealing member <NUM> is disposed between the second housing part <NUM> and the first structural member <NUM>.

In an embodiment of this application, alternatively, the first structural member <NUM> is also provided with a leakage hole (not marked in the figure). The leakage hole is connected to the first space <NUM>, and a damping mesh is disposed in the leakage hole. The damping mesh is attached in the leakage hole or at least one of two ends of the leakage hole. The leakage hole and the damping mesh are configured to adjust air pressure balance of the first space <NUM>, to prevent noise caused by an excessive air pressure.

Still refer to <FIG>, in this embodiment of this application, alternatively, the electronic device <NUM> further includes a second structural member <NUM>. The second structural member <NUM> is disposed on a surface, away from the middle frame <NUM>, of the first structural member <NUM>, that is, between the first structural member <NUM> and the back shell <NUM>. To implement electrical connection between the sound-emitting assembly <NUM> and the first circuit board <NUM>, a connecting component is disposed on a contact surface, in contact with the housing <NUM> of the sound-emitting assembly <NUM>, on the second structural member <NUM>. The sound-emitting assembly <NUM> further includes a lead wire. One end of the lead wire is electrically connected to the sound-emitting component <NUM>. The other end of the lead wire leads out to an outer surface of the housing <NUM> and is connected to the connecting component on the second structural member <NUM>. The connecting component is electrically connected to the second structural member <NUM>. The second structural member <NUM> is electrically connected to the first circuit board <NUM> through a flexible printed circuit board.

Still refer to <FIG>, in another alternative implementation, one end of the lead wire of the sound-emitting assembly <NUM> is electrically connected to the sound-emitting component <NUM>, and the other end of the lead wire leads out from the second sound guide hole <NUM> connected to a rear cavity hole and connected to a connecting component on a periphery of the second sound guide hole <NUM> connected to a rear cavity hole. That is, the connecting component is disposed on a surface, in contact with a motherboard, of the second housing part <NUM> of the housing <NUM>. The other end of the lead wire is connected to the connecting component, and the first circuit board <NUM> is electrically connected to the connecting component. Therefore, electrical connection between the sound-emitting assembly <NUM> and the first circuit board <NUM> is implemented. Alternatively, the connecting component may be a spring plate. A pin is formed at a connection position, corresponding to the spring plate, of the first circuit board <NUM>. Connection is implemented through press-fit contact between the spring plate and the pin.

As an increasing number of components are integrated into the first circuit board <NUM>, but an area of the first circuit board <NUM> is limited, space for a component layout is increasingly limited. To resolve the foregoing problem, alternatively, in an embodiment of this application, the first structural member <NUM> and the first circuit board <NUM> are connected through an adapter board <NUM>. Therefore, a component on the first structural member <NUM> is electrically connected to a component on the first circuit board <NUM>, and an effective layout area of the first circuit board <NUM> is increased, so that so that more components can be placed, and more functions can be achieved.

<FIG> is a schematic diagram of a back of a middle frame according to an embodiment of this application. As shown in <FIG>, the back of the middle frame <NUM> is divided into three regions, that is, a top region <NUM>, a middle region <NUM>, and a bottom region <NUM>. A speaker <NUM> and a cover plate assembly <NUM> are both disposed in the top region <NUM> of the middle frame <NUM>. To achieve a stereo effect, a speaker module <NUM> is disposed at the bottom region <NUM> of an electronic device <NUM>. The speaker module <NUM> implements sound transmission on speaker through a speaker sound-emitting hole <NUM> at the bottom of the electronic device <NUM>. A speaker assembly occupies large space. However, because the speaker module <NUM> is disposed at the bottom of the electronic device <NUM>, the large space has less influence. In this embodiment of this application, a sound-emitting assembly <NUM> is disposed at a top region <NUM>. Because an original first structural member <NUM> and first circuit board <NUM> of the electronic device <NUM> are used to form closed first space <NUM>, a rear cavity <NUM> of the sound-emitting assembly <NUM> may be connected to the first space <NUM>, thereby increasing a volume of the cavity. Therefore, a shape of the sound-emitting assembly <NUM> may be made smaller, so that the sound-emitting assembly <NUM> occupies less space at the top region <NUM>. Further, space in the middle region <NUM> may be increased properly. The middle region <NUM> is used to place a battery <NUM>. Therefore, a capacity of the battery <NUM> may be increased to some extent, thereby improving battery life of the electronic device <NUM>. In addition, the sound-emitting assembly <NUM> at the top region <NUM> matches with the speaker module <NUM> at the bottom region <NUM> to produce a stereo effect.

<FIG> is a frequency response curve graph according to an embodiment of this application. As shown in <FIG>, a curve <NUM> is a frequency response curve in the prior art, and a curve <NUM> is a frequency response curve after the solution in this embodiment of this application is used. It can be seen that, compared with the prior art, the solution in this embodiment of this application significantly increases a low-frequency response, that is, sound quality of an electronic device <NUM> is better, and user experience is improved.

In a word, in the embodiments of this application, an original frame board, a motherboard, and other components of the electronic device are used to form a closed sound cavity, reducing space occupied by a speaker and increasing a volume of the sound cavity. Therefore, performance of the speaker can be effectively increased, the sound quality can be improved, and a bad phenomenon of vibration of a battery cover caused by the speaker is prevented.

It should be noted that, in this specification, the terms "include", "comprise", or their any other variant is intended to cover a non-exclusive inclusion, so that a process, a method, an article, or an apparatus that includes a list of elements not only includes those elements but also includes other elements which are not expressly listed, or further includes elements inherent to such process, method, article, or apparatus. In the absence of more restrictions, an element defined by the statement "including a. " does not preclude the presence of other identical elements in the process, method, article, or apparatus that includes the element. In addition, it should be noted that a scope of the method and the apparatus in the implementations of this application is not limited to: performing a function in a sequence shown or discussed, and may further include: performing a function in a basically simultaneous manner or in a reverse sequence based on an involved function. For example, the described method may be performed in a different order, and various steps may be added, omitted, or combined. In addition, features described with reference to some examples may be combined in other examples.

Claim 1:
An electronic device (<NUM>), comprising: a display module (<NUM>), a middle frame (<NUM>), a sound-emitting assembly (<NUM>), a first circuit board (<NUM>), a first structural member (<NUM>), and a back shell (<NUM>), wherein
the middle frame (<NUM>) is provided with an accommodating groove, the display module (<NUM>) is disposed in the accommodating groove, the sound-emitting assembly (<NUM>), the first circuit board (<NUM>), the first structural member (<NUM>), and the back shell (<NUM>) are disposed on a side, away from the display module (<NUM>), of the middle frame (<NUM>), and the sound-emitting assembly (<NUM>), the first circuit board (<NUM>), and the first structural member (<NUM>) are located in an installation cavity formed by the back shell (<NUM>) and the middle frame (<NUM>); and
the sound-emitting assembly (<NUM>) comprises a housing (<NUM>) and a sound-emitting component (<NUM>), the housing (<NUM>) is provided with a first cavity, the sound-emitting component (<NUM>) is located in the first cavity and divides the first cavity into a front cavity (<NUM>) and a rear cavity (<NUM>), and the housing (<NUM>) is further provided with a first sound guide hole (<NUM>) and a second sound guide hole (<NUM>), the first sound guide hole (<NUM>) communicates with the front cavity (<NUM>), and the second sound guide hole (<NUM>) communicates with the rear cavity (<NUM>);
characterized in that the first structural member (<NUM>) and the first circuit board (<NUM>) form first space (<NUM>) by enclosure, either of the first structural member (<NUM>) or the first circuit board (<NUM>) is provided with a third sound guide hole (<NUM>), and the rear cavity communicates with the first space (<NUM>) through the second sound guide hole (<NUM>) and the third sound guide hole (<NUM>),
wherein there is a first gap between the first structural member (<NUM>) and the back shell (<NUM>), and a second gap between the housing (<NUM>) and the back shell (<NUM>).