Patent Description:
This application pertains to the field of audio device technologies, and in particular, to a mobile terminal.

A terminal device such as a mobile phone, a tablet computer, or a notebook computer is equipped with a speaker. The speaker includes a box and a sound generation unit disposed in the box. When the speaker is applied to the terminal device, the box of the speaker communicates with an external environment through a sound hole.

In the conventional technology, the speaker communicates with internal space of the terminal device. Therefore, when a housing of the terminal device is pressed and a size of the internal space of the terminal device changes, atmospheric pressure in front space and rear space of a diaphragm in the box of the speaker changes correspondingly. In this case, vibration frequency of air in the sound generation unit is disturbed. Consequently, the diaphragm moves up and down to generate noise, and may touch a magnetic part in the sound generation unit and be damaged. In addition, there is relatively obvious sibilance and a relatively obvious metal sound when the speaker generates a sound. <CIT> discloses a speaker box for improving high-frequency acoustic performance.

Embodiments of this application are intended to provide a mobile terminal, to resolve a technical problem, in the conventional technology, that when a housing of the mobile terminal is pressed and a size of internal space changes, there is relatively obvious sibilance and a relatively obvious metal sound when a speaker in the mobile terminal generates a sound.

To achieve the foregoing objective, a technical solution is proposed according to claim <NUM> : A mobile terminal is provided. The mobile terminal includes a housing and a speaker disposed in the housing. The speaker includes a box and a sound generation unit configured to generate a sound. The box includes a first cover body and a second cover body and a cover plate, that is located on the first cover body. The sound generation unit is disposed in the first cover body, and a first cavity is formed between the sound generation unit and an inner bottom wall of the first cover body. A sound hole that communicates with an external environment of the housing is disposed on a side of the first cavity. A second cavity is formed between the sound generation unit and an inner top wall of the second cover body. The sound generation unit includes a diaphragm configured to generate sound through vibration, and two opposite surfaces of the diaphragm respectively correspond to the first cavity and the second cavity, wherein one of the two opposite surfaces of the diaphragm faces the second cavity. A resonant cavity is formed in the first cover body, the resonant cavity communicates with the first cavity, and a through hole is disposed on a side that is of the resonant cavity and that faces the second cavity. The cover plate covers the through hole, and a microhole that communicates with the second cavity is disposed on the cover plate.

In the mobile terminal provided in this embodiment of this application, the speaker is disposed in the housing of the mobile terminal, the first cavity is formed between the sound generation unit in the speaker and the first cover body of the box, the second cavity is formed between the sound generation unit and the second cover body of the box, the sound generated by the sound generation unit is output to the external environment through the sound hole, the first cavity communicates with the second cavity through the resonant cavity, the cover plate on which the microhole is disposed is disposed at the through hole of the resonant cavity, and the resonant cavity communicates with the second cavity through the microhole. In this way, balance of atmospheric pressure can be maintained for the first cavity and the second cavity of the box through the resonant cavity, so that the diaphragm in the sound generation unit vibrates normally. The second cavity communicates with the resonant cavity through the microhole, and a relatively small volume of airflow can pass through the microhole. Therefore, circulation of airflow in the second cavity is reduced. In this way, when the box is pressed or returns to a normal state from a pressed state, the airflow enters and exits the second cavity through the microhole, and therefore atmospheric pressure in the second cavity does not change significantly. The first cavity communicates with the external environment through the sound hole, and therefore atmospheric pressure in the first cavity also does not change significantly. Therefore, when the diaphragm in the sound generation unit vibrates, an amplitude of the diaphragm can be kept within a proper range. In this way, the diaphragm does not collide with a magnetic part in the sound generation unit during vibration, and therefore sibilance and a metal sound that exist when the speaker generates a sound, especially when a high-frequency sound is generated, are effectively suppressed, thereby improving quality of the high-frequency sound generated by the speaker.

Optionally, an enclosure frame is disposed in the first cover body, the sound generation unit is built into the enclosure frame, a first region is formed at intervals between an inner sidewall of the first cover body and an outer sidewall of the enclosure frame, a block-shaped object is disposed in the first region, and the resonant cavity is disposed in the block-shaped object. The first region is formed at intervals between an inner wall of the first cover body and an outer wall of the enclosure frame, and the resonant cavity is disposed in the block object in the first region, so that assembly space in the box is fully used, and the resonant cavity is independently disposed with respect to the first cavity and the second cavity.

Optionally, the box further includes a porous object, and the porous object is disposed on the cover plate and covers the microhole. The porous object is disposed on the cover plate, and the porous object covers the microhole, so that a combination of the porous object and the microhole is used to further limit a volume of airflow that enters and exits the second cavity, so as to further stabilize the atmospheric pressure in the second cavity.

Optionally, the porous object is attached to a side that is of the cover plate and that faces or faces away from the resonant cavity.

Optionally, a concave cavity is disposed on a side that is of the cover plate and that faces or faces away from the resonant cavity, the porous object is built into the concave cavity, and the microhole is disposed at a bottom of the concave cavity. The concave cavity is disposed on the cover plate, and the porous object is built into the concave cavity, to improve connection stability between the multihole object and the cover plate, and to facilitate fast removal and replacement of the porous object with respect to the cover plate.

Optionally, a gap is formed between an outer edge of the porous object and a cavity wall of the concave cavity.

Optionally, the porous object is a mesh, and the mesh is made of a nonwoven fabric; or the mesh is formed by stacking a nonwoven fabric and degreased gauze. The porous object is specifically set as a mesh. In this way, because of relatively good permeability of the mesh and the fact that holes on the mesh are relatively evenly and finely distributed, the mesh cooperates with the microhole, to precisely adjust the volume of airflow that enters and exits the second cavity.

Optionally, the box further includes a PET film, the PET film covers a side that is of the cover plate and that face away from the resonant cavity, and a first ventilation region that communicates with the second cavity is formed between the PET film and the cover plate.

Optionally, the box further includes a PET film, the PET film covers a side that is of the cover plate and that faces from the resonant cavity, and a second ventilation region that communicates with the resonant cavity is formed between the PET film and the cover plate.

Optionally, the box further includes a PET film, the PET film covers a side that is of the cover plate and that faces or faces away from the resonant cavity, and several ventilation holes are disposed on the PET film.

Optionally, a connection channel is disposed on a cavity wall of the first cavity, the connection channel penetrates through the enclosure frame and the block object, and communicates with the resonant cavity, and a cross-sectional area of the connection channel is greater than an opening area of the microhole. It is set that the cross-sectional area of the connection channel is greater than the opening area of the microhole, so that a speed at which the airflow enters the resonant cavity from the first cavity is greater than a speed at which the airflow enters the second cavity from the resonant cavity, to reduce a speed at which the airflow is exchanged between the first cavity and the second cavity.

Optionally, the cross-sectional area of the connection channel is <NUM> to <NUM> times the opening area of the microhole. In this way, the speed at which the airflow is exchanged between the first cavity and the second cavity is precisely controlled.

Optionally, an aperture of the microhole ranges from <NUM> to <NUM>. In this way, the volume of airflow that enters and exits the second cavity is effectively controlled.

To describe technical solutions in embodiments of this application or the conventional technology more clearly, the following briefly introduces the accompanying drawings required for describing embodiments or the conventional technology. It is clear that the accompanying drawings in the following descriptions show some embodiments of this application, and a person of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.

The embodiments of this application are described below in detail. Examples of the embodiments are shown in the accompanying drawings, and same or similar reference numerals represent same or similar elements or elements with same or similar functions. The embodiments described below with reference to <FIG> are examples, are intended to explain this application, and should not be understood as a limitation on this application.

In the descriptions of this application, it should be understood that directions or positional relationships indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", and "outside" are directions or positional relationships shown based on the accompanying drawings, are merely used for facilitating description of this application and for description simplicity, and do not indicate or imply that an indicated apparatus or element needs to have a specific direction or needs to be constructed and operated in a specific direction. Therefore, this should not be understood as a limitation on this application.

In addition, the terms "first" and "second" are merely intended for a purpose of description, and shall not be understood as an indication or implication of relative importance or implicit indication of the number of indicated technical features. Therefore, a feature limited by "first " or "second" may explicitly indicate or implicitly include one or more such features. In the descriptions of this application, unless otherwise expressly and specifically limited, "a plurality of" means two or more.

In this application, unless otherwise expressly specified and limited, terms such as "mounting", "connected", "connection", and "fastening" should be understood in a broad sense. For example, there may be a fixed connection, a detachable connection, or an integrated connection; there may be a mechanical connection or an electrical connection; or there may be a direct connection, an indirect connection established by using an intermediate medium, or a connection inside two elements or an interaction relationship between two elements. A person of ordinary skill in the art may understand specific meanings of the foregoing terms in this application based on a specific situation.

For ease of understanding, technical terms in this application are first explained and described below.

A speaker is an energy conversion device that converts an electrical signal into a sound signal. The speaker electrically drives a voice coil in the speaker to vibrate, and drives a diaphragm to vibrate, so that air around the speaker resonates and generates a sound.

PET (Polyethylene-terephthalate) is a thermoplastic polyester including polyethylene terephthalate. PET is a polycondensate of terephthalic acid and ethylene glycol, and is commonly known as polyester resin in the industry.

A nonwoven fabric is made of an orientated or random fiber, and has advantages such as moisture-proof, breathable, flexible, lightweight, non-combustible, and easy to decompose.

Degreased gauze refers to pure cotton gauze obtained after degreasing treatment.

<FIG> is a schematic diagram of a structure of a sound generation apparatus <NUM> in the conventional technology. It is shown in <FIG> that an air discharge hole <NUM> is disposed on a housing of the sound generation apparatus <NUM>. When the sound generation apparatus <NUM> is assembled into an external terminal device, the air discharge hole <NUM> of the sound generation apparatus communicates with internal space of the terminal device.

As shown in <FIG>, an embodiment of this application provides a mobile terminal <NUM>. The mobile terminal <NUM> includes a housing <NUM> and a speaker <NUM> disposed in the housing <NUM>. The mobile terminal <NUM> includes but is not limited to a mobile phone, a tablet computer, a notebook computer, an ultra-mobile personal computer (ultra-mobile personal computer, UMPC), a netbook, a personal digital assistant (personal digital assistant, PDA), or the like. In particular, the mobile terminal <NUM> has a relatively high waterproof sealing property. A specific type of the mobile terminal <NUM> is not limited in this embodiment of this application.

Referring to <FIG> and <FIG>, the speaker <NUM> includes a box <NUM> and a sound generation unit <NUM> configured to generate a sound. The box <NUM> includes a first cover body <NUM> and a second cover body <NUM> and a cover plate <NUM> that are located on the first cover body <NUM>. The sound generation unit <NUM> is disposed in the first cover body <NUM>, and a first cavity <NUM> is formed between the sound generation unit <NUM> and an inner bottom wall of the first cover body <NUM>. A sound hole <NUM> that communicates with an external environment of the housing <NUM> is disposed in the first cavity <NUM>. A notch <NUM> is disposed at a position that is of the housing <NUM> of the mobile terminal <NUM> and that corresponds to the sound hole <NUM> of the speaker <NUM>, so that a sound generated by the speaker <NUM> is conducted to the external environment. A second cavity <NUM> is formed between the sound generation unit <NUM> and an inner top wall of the second cover body <NUM>.

In this embodiment of this application, the sound generation unit <NUM> may be a dome sound generation unit, a reed sound generation unit, a cone sound generation unit, or the like. Referring to <FIG>, basic components of the sound generation unit <NUM> may include a frame <NUM>, a voice coil <NUM> disposed in the frame <NUM>, and a diaphragm <NUM> that surrounds a periphery of the voice coil <NUM> and that is exposed to the frame <NUM>. A washer <NUM> and a magnetic part <NUM> are disposed on the diaphragm and respectively below the diaphragm <NUM>, and an iron core <NUM> is disposed below the magnetic part <NUM>. Referring to <FIG>, a flexible circuit board <NUM> configured to be electrically connected to a related electrical device in the mobile terminal <NUM> is further led out from the speaker <NUM>.

Referring to <FIG>, two opposite surfaces of the diaphragm <NUM> in the sound generation unit <NUM> respectively correspond to the first cavity <NUM> and the second cavity <NUM>. A resonant cavity <NUM> is formed in the first cover body <NUM>, the resonant cavity <NUM> communicates with the first cavity <NUM>, and a through hole <NUM> is disposed on a side that is of the resonant cavity <NUM> and that faces the second cavity <NUM>. The cover plate <NUM> covers the through hole <NUM>, and a microhole <NUM> that communicates with the second cavity <NUM> is disposed on the cover plate <NUM>. In this embodiment, a surface that is of the diaphragm <NUM> and that faces away from the magnetic part <NUM> is disposed to correspond to the second cavity <NUM> , and a surface that is of the diaphragm <NUM> and that faces the magnetic part <NUM> is disposed to correspond to the first cavity <NUM>.

More specifically, in this embodiment of this application, the second cavity <NUM> of the speaker <NUM> does not communicate with internal space of the housing <NUM> of the mobile terminal <NUM>, which is different from the design, in the conventional technology, in which the air discharge hole <NUM> that communicates with an inside of the terminal device is disposed on the housing of the sound generation apparatus <NUM> (as shown in <FIG>). As shown in <FIG>, the resonant cavity <NUM> communicates with the second cavity <NUM> through the microhole <NUM>.

As shown in <FIG>, the speaker <NUM> provided in this embodiment of this application is further described below. In the speaker <NUM> provided in this embodiment of this application, the sound generation unit <NUM> of the speaker <NUM> is disposed in the box <NUM>, the first cavity <NUM> is formed between the sound generation unit <NUM> and the first cover body <NUM> of the box <NUM>, the second cavity <NUM> is formed between the sound generation unit <NUM> and the second cover body <NUM> of the box <NUM>, the sound generated by the sound generation unit <NUM> is output to the external environment through the sound hole <NUM>, the first cavity <NUM> communicates with the second cavity <NUM> through the resonant cavity <NUM>, the cover plate <NUM> on which the microhole <NUM> is disposed is disposed at the through hole <NUM> of the resonant cavity <NUM>, and the resonant cavity <NUM> communicates with the second cavity <NUM> through the microhole <NUM>. In this way, balance of atmospheric pressure can be maintained for the first cavity <NUM> and the second cavity <NUM> of the speaker <NUM> through the resonant cavity <NUM>, so that the diaphragm <NUM> in the sound generation unit <NUM> vibrates normally. The second cavity <NUM> communicates with the resonant cavity <NUM> through the microhole <NUM>, and a relatively small volume of airflow can pass through the microhole <NUM>. Therefore, circulation of airflow in the second cavity <NUM> is reduced. In this way, when the box <NUM> is pressed or returns to a normal state from a pressed state, the airflow enters and exits the second cavity <NUM> through the microhole <NUM>, and therefore atmospheric pressure in the second cavity <NUM> does not change significantly. The first cavity <NUM> communicates with the external environment through the sound hole <NUM>, and therefore atmospheric pressure in the first cavity <NUM> also does not change significantly. Therefore, when the diaphragm <NUM> in the sound generation unit <NUM> vibrates, an amplitude of the diaphragm <NUM> can be kept within a proper range. In this way, the diaphragm <NUM> does not collide with the magnetic part <NUM> in the sound generation unit <NUM> during vibration, and therefore sibilance and a metal sound that exist when the speaker <NUM> generates a sound, especially when a high-frequency sound is generated, are effectively suppressed, thereby improving quality of the high-frequency sound generated by the speaker <NUM>.

The through hole <NUM> is disposed on one side of the resonant cavity <NUM>, and the microhole <NUM> is formed on the cover plate <NUM> that covers the through hole <NUM>. In this way, when an aperture size of the microhole <NUM> needs to be adjusted, the cover plate <NUM> may be removed and replaced with a cover plate <NUM> that includes a microhole <NUM> with a corresponding aperture, to flexibly adjust an aperture of the microhole <NUM>.

Optionally, the cover plate <NUM> may be built into the through hole <NUM>, to improve convenience of removing and replacing the cover plate <NUM> with respect to the second cavity <NUM>, or may be bonded to an outer edge of the through hole <NUM> in a manner such as gluing or hot-melt bonding, to improve assembly stability of the cover plate <NUM> with respect to the second cavity <NUM>.

Optionally, the microhole <NUM> may be an irregularly shaped hole such as a round hole, an elliptical hole, or a rectangular hole. A specific hole type of the microhole <NUM> may be determined based on a volume of to-be-exchanged airflow designed for the second cavity <NUM>.

In some other embodiments of this application, as shown in <FIG>, an enclosure frame <NUM> is disposed in the first cover body <NUM>, the sound generation unit <NUM> is built into the enclosure frame <NUM>, a first region <NUM> is formed at intervals between an inner wall of the first cover body <NUM> and an outer wall of the enclosure frame <NUM>, a block-shaped object <NUM> is disposed in the first region <NUM>, the resonant cavity <NUM> is disposed in the block-shaped object <NUM>, and a connection channel <NUM> penetrates through the enclosure frame <NUM> and the block-shaped object <NUM>, and communicates with the resonant cavity <NUM>.

Specifically, space between the sound generation unit <NUM> and the enclosure frame <NUM> may be sealed through gluing. In this way, the first cavity <NUM> and the second cavity <NUM> are isolated and sealed, and glue is used as a buffer between the sound generation unit <NUM> and the enclosure frame <NUM>, to eliminate excessive vibration caused due to mutual collision between the sound generation unit <NUM> and the enclosure frame <NUM>, so as to improve a sound generation effect of the sound generation unit <NUM>.

The first region <NUM> is formed at intervals between the inner wall of the first cover body <NUM> and the outer wall of the enclosure frame <NUM>, and the resonant cavity <NUM> is disposed in the block-shaped object <NUM> in the first region <NUM>, so that assembly space in the box <NUM> is fully used, and the resonant cavity <NUM> is independently disposed with respect to the first cavity <NUM> and the second cavity <NUM>.

Optionally, the block-shaped object <NUM> may be integrally formed with the first cover body <NUM>, to reduce manufacturing costs of the box <NUM>. Alternatively, the block-shaped object <NUM> may be independently manufactured and formed, and then built into or bonded to the first region <NUM>. In this way, the block-shaped object <NUM> and the first cover body <NUM> may not need to be made of a same material. For example, the first cover body <NUM> may be made of a plastic part, and the block-shaped object <NUM> may be made of a metal part. In addition, the block-shaped object may be in a square shape or an irregular shape. A shape of the block-shaped object may be determined based on a size and a shape of assembly space available in the first region <NUM>.

In some other embodiments of this application, as shown in <FIG>, <FIG>, and <FIG>, the box <NUM> further includes a porous object <NUM>, and the porous object <NUM> is disposed on the cover plate <NUM> and covers the microhole <NUM>.

Specifically, the porous object <NUM> is disposed on the cover plate <NUM>, and the porous object <NUM> covers the microhole <NUM>, so that a combination of the porous object <NUM> and the microhole <NUM> is used to further limit a volume of airflow that enters and exits the second cavity <NUM>, so as to further stabilize the atmospheric pressure in the second cavity <NUM>.

Optionally, the porous object <NUM> may be removably disposed on the cover plate <NUM> by using double-sided adhesive or the like. In this way, porous objects <NUM> with different thicknesses may be used through replacement, to further precisely adjust the volume of airflow that enters and exits the second cavity <NUM>, so as to precisely adjust and control the atmospheric pressure in the second cavity <NUM>.

In some other embodiments of this application, the porous object <NUM> is attached to a side that is of the cover plate <NUM> and that faces or faces away from the resonant cavity <NUM>.

Specifically, the porous object <NUM> may be mounted on the side that is of the cover plate <NUM> and that faces or faces away from the resonant cavity <NUM> based on a size of assembly space on the side that is of the cover plate <NUM> and that faces or faces away from the resonant cavity <NUM>.

In some other embodiments of this application, as shown in <FIG>, a concave cavity <NUM> is disposed on a side that is of the cover plate <NUM> and that faces or faces away from the resonant cavity <NUM>, the porous object <NUM> is built into the concave cavity <NUM>, and the microhole <NUM> is disposed at a bottom of the concave cavity <NUM>.

Specifically, the concave cavity <NUM> is disposed on the cover plate <NUM>, and the porous object <NUM> is built into the concave cavity <NUM>, to improve connection stability between the porous object <NUM> and the cover plate <NUM>, and to facilitate fast removal and replacement of the porous object <NUM> with respect to the cover plate <NUM>.

Optionally, the porous object <NUM> is bonded to the concave cavity <NUM>, to improve assembly stability of the porous object <NUM> in the concave cavity <NUM>. In addition, an outer edge of the porous object <NUM> may be connected to a cavity wall of the concave cavity <NUM> or an edge at the bottom of the concave cavity <NUM> through gluing or by attaching double-sided adhesive, so that when the airflow flows into the porous object <NUM> through the microhole <NUM>, the airflow does not flow out from a gap between the porous object <NUM> and the cavity wall of the concave cavity <NUM>, and most of the airflow flows into the second cavity <NUM> or the resonant cavity <NUM> through the porous object <NUM>. In this way, utilization of the porous object <NUM> is improved, and a function of blocking the airflow by the porous object <NUM> is fully used.

In some other embodiments of this application, a gap is formed between the outer edge of the multihole object <NUM> and the cavity wall of the concave cavity <NUM>.

Specifically, a gap is formed between the outer edge of the porous object <NUM> and the cavity wall of the concave cavity <NUM>. In this way, it may be convenient to pull the porous object <NUM> out of the concave cavity <NUM>, so that the porous object <NUM> can be quickly removed from the concave cavity <NUM>, and assembly convenience of the porous object <NUM> with respect to the concave cavity <NUM> is improved.

In some other embodiments of this application, the porous object <NUM> is a mesh <NUM>, and the mesh <NUM> may be made of a nonwoven fabric <NUM>.

Specifically, the porous object <NUM> is specifically set as the mesh <NUM>. In this way, because of relatively good permeability of the mesh <NUM> and the fact that holes on the mesh <NUM> are relatively evenly and finely distributed, the mesh <NUM> cooperates with the microhole <NUM>, to precisely adjust the volume of airflow that enters and exits the second cavity <NUM> and to improve smoothness and evenness of the airflow that enters and exits the second cavity <NUM>. In addition, the mesh <NUM> is easy to obtain and is manufactured at low costs. Therefore, overall manufacturing costs of the speaker <NUM> are reduced.

The nonwoven fabric <NUM> has advantages of breathable, flexible, lightweight, and non-toxic. Therefore, the nonwoven fabric <NUM> can effectively control the volume of airflow that enters and exits the second cavity <NUM>, and improve environmental friendliness of the speaker <NUM> in terms of material selection.

In some other embodiments of this application, as shown in <FIG>, the mesh <NUM> may be formed by stacking a nonwoven fabric <NUM> and a degreased gauze layer <NUM>. In this way, in addition to the foregoing advantages, the mesh <NUM> can further effectively prevent a fine impurity in the air from entering and exiting the second cavity <NUM>, to prevent the fine impurity from flowing freely between the first cavity <NUM> and the second cavity <NUM>, so as to prevent the fine impurity from affecting vibration of the diaphragm <NUM>. Therefore, quality of a sound generated by the speaker <NUM> is improved.

Optionally, the porous object <NUM> may alternatively be made of a material such as a sponge in consideration of costs and the like.

In some other embodiments of this application, as shown in <FIG>, <FIG>, and <FIG>, in a manner of replacing the porous object <NUM>, the box <NUM> further includes a PET film. The PET film <NUM> covers a side that is of the cover plate <NUM> and that faces the resonant cavity <NUM>, and a second ventilation region <NUM> (as shown in <FIG>) that communicates with the resonant cavity <NUM> is formed between the PET film <NUM> and the cover plate <NUM>. Alternatively, the PET film <NUM> covers a side that is of the cover plate <NUM> and that faces away from the resonant cavity <NUM>, and a first ventlation region <NUM> (as shown in <FIG>) that communicates with the second cavity <NUM> is formed between the PET film <NUM> and the cover plate <NUM>.

Specifically, as shown in <FIG>, <FIG>, and <FIG>, in this embodiment, the PET film <NUM> is used to replace the porous object <NUM>, and the PET film <NUM> covers the cover plate <NUM>. In this way, the airflow that enters and exits the second cavity <NUM> through the microhole <NUM> may be blocked by the PET film <NUM> and enter the resonant cavity <NUM> through the first breather region <NUM> or enter the second cavity <NUM> through the second breather region <NUM>. The volume of airflow that enters and exits the second cavity <NUM> may be effectively adjusted by controlling a size of region space of the first breather region <NUM> or the second breather region <NUM>.

Therefore, costs of adjusting the volume of airflow that enters and exits the second cavity <NUM> are reduced. The PET film <NUM> has high impact resistance performance and a non-toxic property, and therefore the PET film <NUM> can be used stably in the speaker <NUM> for a long time, and improve environmental friendliness of the speaker <NUM> in terms of material selection.

Optionally, as shown in <FIG>, as an alternative to canceling the design of the first breather region <NUM> or the second breather region <NUM>, several breather holes <NUM> may be directly disposed on the PET film <NUM>, so that the PET film <NUM> is breathable, and the airflow that enters and exits the second cavity <NUM> may directly flow into the second cavity <NUM> or the resonant cavity <NUM> through the breather holes <NUM> after passing through the microhole <NUM>. In this way, a breathable structure of the PET film <NUM> can be simplified, to reduce overall manufacturing costs of the speaker <NUM>.

In some other embodiments of this application, as shown in <FIG>, the connection channel <NUM> is disposed on an inner wall of the enclosure frame <NUM>, the connection channel <NUM> communicates with the resonant cavity <NUM>, and a cross-sectional area of the connection channel <NUM> is greater than an opening area of the microhole <NUM>. Specifically, the connection channel <NUM> may be disposed through mechanical processing, or may be formed during injection molding of the box <NUM>.

It is set that the cross-sectional area of the connection channel <NUM> is greater than the opening area of the microhole <NUM>, so that a speed at which the airflow enters the resonant cavity <NUM> from the first cavity <NUM> is greater than a speed at which the airflow enters the second cavity <NUM> from the resonant cavity <NUM>, to reduce a speed at which the airflow is exchanged between the first cavity <NUM> and the second cavity <NUM>.

In some other embodiments of this application, the cross-sectional area of the connection channel <NUM> is <NUM> to <NUM> times the opening area of the microhole <NUM>. Specifically, it is set that the cross-sectional area of the connection channel <NUM> is <NUM> to <NUM> times the opening area of the microhole <NUM>, to precisely control the speed at which the airflow is exchanged between the first cavity <NUM> and the second cavity <NUM>.

Optionally, the cross-sectional area of the connection channel <NUM> is <NUM> to <NUM> times the opening area of the microhole <NUM>. Specifically, it is set that the cross-sectional area of the connection channel <NUM> is <NUM> to <NUM> times the opening area of the microhole <NUM>, to precisely control the speed at which the airflow is exchanged between the first cavity <NUM> and the second cavity <NUM>, and to avoid a case in which the microhole <NUM> is manufactured with an excessively small size to meet a multiple relationship between the opening area of the microhole <NUM> and the cross-sectional area of the connection channel <NUM>. In this way, the volume of airflow that enters and exits the second cavity <NUM> is controlled, and difficulty in disposing the microhole <NUM> is reduced.

Claim 1:
A mobile terminal (<NUM>), comprising a housing (<NUM>) and a speaker (<NUM>) disposed in the housing (<NUM>), wherein the speaker (<NUM>) comprises a box (<NUM>) and a sound generation unit (<NUM>) configured to generate a sound;
the box (<NUM>) comprises a first cover body (<NUM>) and a second cover body (<NUM>) and a cover plate (<NUM>), that is located on the first cover body (<NUM>);
the sound generation unit (<NUM>) is disposed in the first cover body (<NUM>), a first cavity (<NUM>) is formed between the sound generation unit (<NUM>) and an inner bottom wall of the first cover body (<NUM>), and a sound hole (<NUM>) that communicates with an external environment of the housing (<NUM>) is disposed on a side of the first cavity (<NUM>);
a second cavity (<NUM>) is formed between the sound generation unit (<NUM>) and an inner top wall of the second cover body (<NUM>);
the sound generation unit (<NUM>) comprises a diaphragm (<NUM>) configured to generate sound through vibration, and two opposite surfaces of the diaphragm (<NUM>) respectively correspond to the first cavity (<NUM>) and the second cavity (<NUM>), wherein one of the two opposite surfaces of the diaphragm (<NUM>) faces the second cavity (<NUM>); and
a resonant cavity (<NUM>) is formed in the first cover body (<NUM>), the resonant cavity (<NUM>) communicates with the first cavity (<NUM>), a through hole (<NUM>) is disposed on a side that is of the resonant cavity (<NUM>) and that faces the second cavity (<NUM>), the cover plate (<NUM>) covers the through hole (<NUM>), and a microhole (<NUM>) that communicates with the second cavity (<NUM>) is disposed on the cover plate (<NUM>).