Patent Description:
Mobile terminals (such as mobile phones) have become an indispensable part in people's lives. The current mobile terminals have many functions, and a call function is one of basic functions of the mobile terminals. A receiver is a basic component for implementing the call function, and the receiver is installed in an inner cavity of the mobile terminal. The receiver includes a coil and a diaphragm fastened to the coil. During the working process, when subjected to the Lorentz force in a magnetic field, the coil drives the diaphragm to vibrate. Vibration of the diaphragm pushes the air to vibrate, which in turn produces sound.

Generally, the receiver is disposed on the top of the inner cavity of the mobile terminal, and a front side of the diaphragm of the receiver faces towards a receiver front cavity of the mobile terminal, and a back side faces towards a receiver rear cavity. The receiver front cavity and the receiver rear cavity are sealed and isolated. During vibration of the diaphragm, the front side of the diaphragm may push air from the receiver front cavity into a sound hole of the mobile terminal to transmit sound. The back side of the diaphragm also pushes air in the receiver rear cavity. A low-frequency effect of the receiver is improved through vibration of the air in the receiver rear cavity, and the low-frequency effect of the receiver imposes a relatively great impact on hearing sense for the receiver. Therefore, absence of low frequency may result in harsh and hard sound emitted by the receiver.

As is known, a larger equivalent sound capacity of the receiver rear cavity indicates a better low-frequency effect of the receiver, and the equivalent sound capacity of the receiver rear cavity is affected by a volume of the receiver rear cavity. However, the current mobile terminals are generally becoming increasingly light and thin, resulting in an increasingly small volume of the receiver rear cavity and further leading to an increasingly small equivalent sound capacity of the receiver rear cavity. Obviously, this undoubtedly affects low-frequency performance of the receiver of the mobile terminal.

<CIT> relates to a speaker base of mobile terminal. In the mobile terminal provided by the invention, as the speaker and the speaker base are arranged in the cavity formed by surrounding of the mother board and the host machine back cover of the mobile terminal, the structure of the mobile terminal is compact.

<CIT> relates to a loudspeaker sound outlet structure for a mobile terminal. Compared to existing technology, at the same time that the thickness of a product is further reduced, the present invention may also ensure that sound quality is not affected; furthermore, the internal space of the product is fully utilized, and the cost is also reduced.

<CIT> relates to a mobile phone with a sound amplification effect, so that the sound amplification effect and quality of the mobile phone are improved, particularly the bass part of the sound.

This disclosure discloses a mobile terminal, as defined in the appended set of claims, so as to resolve the problem of a relatively poor low-frequency effect of a receiver of a current mobile terminal.

The technical solution used in this disclosure can achieve the following beneficial effects:
In the mobile terminal disclosed in this disclosure, the housing is provided with a second sound hole, where the second sound hole can communicate with the receiver rear cavity and an external environment, so as to increase air flow in the receiver rear cavity, thereby improving an equivalent sound capacity of the receiver rear cavity and achieving a purpose of optimizing the low-frequency effect.

The accompany drawings described herein are intended to provide a further understanding of this disclosure and constitute a part of this disclosure. The example embodiments of this disclosure and descriptions thereof are intended to explain this disclosure, and do not constitute any improper limitation on this disclosure. In the drawings:.

Description of reference signs:
<NUM>-housing, <NUM>-inner cavity, <NUM>-receiver front cavity, <NUM>-receiver rear cavity, <NUM>-middle frame, <NUM>-first screen cover, <NUM>-first receiver decoration cover, <NUM>-battery cover, <NUM>-second sound hole, <NUM>-second screen cover, <NUM>-second receiver decoration cover, <NUM>-second sound hole, <NUM>-main board upper cover, <NUM>-receiver, <NUM>-dust screen, <NUM>-elastic pad, <NUM>-seal ring, and <NUM>'-seal ring.

To make the purpose, technical solutions, and advantages of this disclosure clearer, the following clearly and completely describes the technical solutions of this disclosure with reference to specific embodiments and the accompanying drawings in this disclosure. Apparently, scope of the invention is defined by the scope of the appended claims.

The technical solutions disclosed in this embodiment of this disclosure are described in detail below with reference to the accompanying drawings.

Referring to <FIG>, an embodiment of this disclosure discloses a mobile terminal, and the mobile terminal disclosed includes a housing <NUM> and a receiver <NUM>.

The housing <NUM> is a peripheral housing of the mobile terminal. The housing <NUM> has an inner cavity <NUM>, and the inner cavity <NUM> is configured to provide an installation space for other components of the mobile terminal. The receiver <NUM> is provided in the inner cavity <NUM> of the housing <NUM>. Usually, the receiver <NUM> is secured in the inner cavity <NUM> of the housing <NUM> by using a connection structure or a connection element.

The inner cavity <NUM> includes a receiver front cavity <NUM> and a receiver rear cavity <NUM>, where the receiver front cavity <NUM> and the receiver rear cavity <NUM> are isolated from each other. The receiver front cavity <NUM> and the receiver rear cavity <NUM> are respectively located on front and rear sides of the receiver <NUM> in a vibration direction of a diaphragm of the receiver <NUM>. The receiver front cavity <NUM> and the receiver rear cavity <NUM> are sealed and isolated by using other components installed in the inner cavity <NUM>.

It should be noted that the receiver front cavity <NUM> is a cavity facing towards a front side of the receiver <NUM> (a side surface on which the diaphragm is disposed), and the receiver rear cavity <NUM> is a cavity facing towards a back side of the receiver <NUM>. Certainly, vibration of the diaphragm of the receiver causes vibration of air in the receiver front cavity <NUM> and the receiver rear cavity <NUM>.

The housing <NUM> is provided with a first sound hole, and the first sound hole communicates with the receiver front cavity <NUM> and an external environment. The housing <NUM> is further provided with a second sound hole, and the second sound hole communicates with the receiver rear cavity <NUM> and the external environment.

At present, mobile terminals are becoming increasingly light and thin, and the receiver rear cavity <NUM> has an increasingly small volume, leading to a smaller equivalent sound capacity of the receiver rear cavity <NUM> and further resulting in a poor low-frequency effect of the receiver <NUM>. In the mobile terminal disclosed in this embodiment of this disclosure, the housing <NUM> is provided with the second sound hole, and the second sound hole can communicate with the receiver rear cavity <NUM> and the external environment, so as to increase air flow in the receiver rear cavity <NUM>, thereby improving an equivalent sound capacity of the receiver rear cavity <NUM> and achieving a purpose of optimizing the low-frequency effect.

Instead of using a method in which the equivalent sound capacity is improved by increasing the volume of the receiver back cavity <NUM>, the mobile terminal disclosed in this embodiment of this disclosure improves the equivalent sound capacity by increasing the air flow in the receiver rear cavity <NUM>, thereby ensuring that a relatively small volume remains for the receiver rear cavity <NUM>. This is good for designing lighter and thinner mobile terminals under the premise that the low-frequency effect is not affected.

Certainly, during the actual working process, sound generated by the receiver <NUM> is transmitted through the first sound hole, and may also be transmitted through the second sound hole. Obviously, as a result, both sides of the mobile terminal have sound outlets, thereby undoubtedly facilitating use by the user.

In order to improve a flow effect of air driven in the receiver rear cavity <NUM>, in an optional solution, the second sound hole may be provided at a part of the housing <NUM> opposite to the back side of the receiver <NUM>. In this case, vibration of the diaphragm of the receiver <NUM> helps the air in the receiver rear cavity <NUM> flow out of the second sound hole. Specifically, a quantity of the second sound holes may be at least two, and the at least two second sound holes are evenly distributed, further optimizing the air flow effect.

During the actual working process, the first sound hole and the second sound hole need to communicate with the receiver front cavity <NUM> and the receiver rear cavity <NUM>, respectively, and the receiver front cavity <NUM> and the receiver rear cavity <NUM> are located in the mobile terminal. In order to avoid affecting other components inside the inner cavity <NUM>, the first sound hole and the second sound hole each are provided with a dust-proof component. Specifically, the dust-proof component may be a dust screen or a waterproof breathable film.

As mentioned above, the receiver front cavity <NUM> and the receiver rear cavity <NUM> are formed in a plurality of manners. The housing <NUM> includes a middle frame <NUM> and a first screen cover <NUM> that is disposed at the top of the middle frame <NUM>. A main board upper cover <NUM> is installed in the inner cavity <NUM>, and the main board upper cover <NUM> is used for installation of a main board of the mobile terminal, and certainly may be also used for installation of other components for the mobile terminal. The receiver <NUM> is installed on the main board upper cover <NUM>. The receiver <NUM>, the main board upper cover <NUM>, the middle frame <NUM>, and the first screen cover <NUM> form an enclosed receiver front cavity <NUM>, and the first screen cover <NUM> is provided with the first sound hole. The foregoing structure can make full use of the existing components of the mobile terminal to form the receiver front cavity <NUM>.

The first screen cover <NUM> is usually a glass cover. In order to improve a decorative effect, the first screen cover <NUM> may include a first receiver decoration cover <NUM>, and the first receiver decoration cover <NUM> is provided with the first sound hole. The first sound hole is provided in the first receiver decoration cover <NUM>, better ensuring appearance performance of the mobile terminal.

On the basis of the housing <NUM> with the above structure, the housing <NUM> further includes a battery cover <NUM>, where the battery cover <NUM>, the middle frame <NUM>, the main board upper cover <NUM>, and the receiver <NUM> form an enclosed receiver rear cavity <NUM>, and the battery cover <NUM> is provided with a second sound hole <NUM>.

Certainly, for the mobile terminals with different structures, the receiver rear cavity <NUM> is formed by different components. The housing <NUM> further includes a second screen cover <NUM>. The second screen cover <NUM>, the middle frame <NUM>, the main board upper cover <NUM>, and the receiver <NUM> form the enclosed receiver rear cavity <NUM>, and the second screen cover <NUM> is provided with a second sound hole <NUM>. In this case, the mobile terminal is usually a dual-screen mobile terminal, and disposition of the foregoing second sound hole <NUM> can be better adapted to double-side operation of calling for a device.

Similarly, the second screen cover <NUM> may include a second receiver decoration cover <NUM>, and the second receiver decoration cover <NUM> is provided with the second sound hole <NUM>.

For a purpose of waterproofing, a dust screen <NUM> may be provided between the battery cover <NUM> or the second screen cover <NUM> and the receiver <NUM>, and the dust screen <NUM> may cover the second sound hole <NUM> or the second sound hole <NUM>.

The receiver <NUM> is a component in the related art, the front side of the receiver has better waterproof performance, and the rear side has poorer waterproof performance. Therefore, a better waterproof element needs to be provided for the rear side of the receiver <NUM>. On this basis, in an optional solution, the waterproof breathable film may be disposed between the battery cover <NUM> or the second screen cover <NUM> and the receiver <NUM>. The waterproof breathable film, is not water permeable but air permeable, so as to ensure that the air flow during the sound generation process is not affected. The dust screen <NUM> and the waterproof breathable film can be directly bonded to the battery cover <NUM> or the second screen cover <NUM> by using glue.

The mobile terminal disclosed in the embodiments of this disclosure may further include an elastic pad <NUM>, where the elastic pad <NUM> is disposed on an edge of the rear side of the receiver <NUM> and is fixedly connected to the dust screen <NUM> or the waterproof and breathable film. The dust screen <NUM> or the waterproof breathable film and the elastic pad <NUM> are secured between the battery cover <NUM> or the second screen cover <NUM> and the receiver <NUM>. The elastic pad <NUM> has good elasticity, and the elastic pad <NUM> is compressed after the mobile terminal is assembled, so as to indirectly implement more stable installation of the dust screen <NUM>.

During specific implementation, the elastic pad <NUM> and the dust screen <NUM> or the waterproof breathable film may be glued to form a whole, and the formed whole is sandwiched between the battery cover <NUM> or the second screen cover <NUM> and the receiver <NUM>. Certainly, one side of the whole formed by the elastic pad <NUM> and the dust screen <NUM> or the waterproof breathable film may be fixedly glued to the receiver <NUM> in advance, and the other side is pressed against the battery cover <NUM> or the second screen cover <NUM>. Alternatively, one side of the whole formed by the elastic pad <NUM> and the dust screen <NUM> or the waterproof breathable film may be fixedly glued to the battery cover <NUM> or the second screen cover <NUM>, and the other side is pressed against the receiver <NUM>.

As shown in <FIG>, the mobile terminal further includes a sealing ring <NUM> (or a sealing ring <NUM>'). The sealing ring <NUM> is disposed in the receiver rear cavity <NUM> and encircles the receiver <NUM>. Encircling the receiver <NUM> with the sealing ring <NUM> reduces space in the receiver rear cavity <NUM>, so that the air is all discharged from the receiver rear cavity <NUM> during vibration of the diaphragm. This solution can also reduce a difference between sound transmitted through the first sound hole and sound transmitted through the second sound hole, to obtain the same hearing sense on both sides of the mobile terminal. Certainly, disposition of the sealing ring <NUM> can further implement functions of sealing and protecting the receiver <NUM>, preventing the receiver <NUM> from being affected by water and dust that enter the receiver rear cavity <NUM> from a joint between the middle frame <NUM> and the battery cover <NUM>.

In a specific implementation, both the elastic pad <NUM> and the sealing ring <NUM> may be foam elements, the elastic pad <NUM> does not need to be used for sealing, and the sealing ring <NUM> provides the sealing function. The elastic pad <NUM> is mainly used for installing the dust screen <NUM> or the waterproof breathable film, and disposition of the elastic pad <NUM> does not block space between the dust screen <NUM> or the waterproof breathable film and the elastic pad <NUM> from communicating with the second sound hole.

The mobile terminal disclosed in this embodiment of this disclosure may be a mobile phone, a tablet computer, a wearable device, or the like, and a specific type of the mobile terminal is not limited in this embodiment of this disclosure.

Claim 1:
A mobile terminal, comprising a housing (<NUM>) having an inner cavity (<NUM>) and a receiver (<NUM>) provided in the inner cavity (<NUM>), wherein the inner cavity (<NUM>) comprises a receiver front cavity (<NUM>) and a receiver rear cavity (<NUM>) that are isolated from each other; the receiver front cavity (<NUM>) and the receiver rear cavity (<NUM>) are respectively located on front and rear sides of the receiver (<NUM>) in a vibration direction of a diaphragm of the receiver (<NUM>); the housing (<NUM>) is provided with a first sound hole communicating with the receiver front cavity (<NUM>); and the housing (<NUM>) is provided with a second sound hole communicating with the receiver rear cavity (<NUM>);
characterized in that the mobile terminal further comprises a sealing ring (<NUM>), wherein the sealing ring (<NUM>) is disposed in the receiver rear cavity (<NUM>) and encircles the receiver (<NUM>),
wherein the housing (<NUM>) comprises a middle frame (<NUM>) and a first screen cover (<NUM>) disposed at the top of the middle frame (<NUM>); a main board upper cover (<NUM>) is installed in the inner cavity (<NUM>); the receiver (<NUM>) is installed on the main board upper cover (<NUM>); the receiver (<NUM>), the main board upper cover (<NUM>), the middle frame (<NUM>), and the first screen cover (<NUM>) form an enclosed receiver front cavity (<NUM>); and the first screen cover (<NUM>) is provided with the first sound hole;
wherein the housing (<NUM>) further comprises a battery cover (<NUM>) or a second screen cover (<NUM>) installed at the bottom of the middle frame (<NUM>); the battery cover (<NUM>) or the second screen cover (<NUM>), the middle frame (<NUM>), the main board upper cover (<NUM>) and the receiver (<NUM>) form an enclosed receiver rear cavity (<NUM>); and the battery cover (<NUM>) or the second screen cover (<NUM>) is provided with the second sound hole;
wherein a surface of the sealing ring (<NUM>) is in contact with the housing (<NUM>) in the vibration direction of the diaphragm, and an orthogonal projection of the sealing ring (<NUM>) on to a same plane parallel to the vibration direction of the diaphragm overlaps with an orthographic projection of the receiver (<NUM>) onto the same plane.