An acoustic output apparatus and an earphone, including: a first diaphragm, a driving component, a second diaphragm and a housing structure, where a space between the second and first diaphragms close to the driving component forms a first cavity with the housing structure; a space between the electroacoustic transducer and the second diaphragm forms a second cavity with the housing structure; and in a working state, the driving component drives the first diaphragm to vibrate so as to cause the second diaphragm to passively vibrate, and a volume of the second cavity is not greater than ⅕ of an equivalent volume of the electroacoustic transducer.

TECHNICAL FIELD

The present application relates to the technical field of sound generation devices, and in particular, to an acoustic output apparatus, an earphone and an ultra-linear multi-magnetic double-diaphragm loudspeaker.

BACKGROUND

With the development of the society, the application of acoustic output apparatuses such as earphones is becoming more and more widespread, and people's requirements for the sound quality and wearing comfort of the earphones are also increasing.

Open-type earphones in the related art have superior wearing comfort performance as the earphones do not extend into human ear canal.

SUMMARY

A main object of the present application is to provide an acoustic output apparatus, an earphone and an ultra-linear multi-magnetic double-diaphragm loudspeaker, aiming to improve a bass performance of the acoustic output apparatus and the earphone, and to ensure linearity of frequency response of the ultra-linear multi-magnetic double-diaphragm loudspeaker.

In order to achieve the above object, in a first aspect, the present application provides an acoustic output apparatus, including:an electroacoustic transducer including a first diaphragm and a driving component, where the first diaphragm is provided on a side of the driving component and is connected to the driving component;a second diaphragm provided at a side of the driving component away from the first diaphragm, the second diaphragm being spaced apart from the electroacoustic transducer; anda housing structure configured to carry the electroacoustic transducer and the second diaphragm, where a space between a side of the second diaphragm close to the driving component and a side of the first diaphragm close to the driving component forms a first cavity with the housing structure, and a space between a side of the electroacoustic transducer close to the second diaphragm and the second diaphragm forms a second cavity with the housing structure; where,in a working state, the driving component drives the first diaphragm to vibrate, the first diaphragm pushes an air spring sealed in the first cavity to vibrate and causes the second diaphragm to passively vibrate with the air spring, and a volume of the second cavity is not greater than ⅕ of an equivalent volume of the electroacoustic transducer.

In a second aspect, the present application further provides an earphone, including an acoustic output apparatus, where the acoustic output apparatus includes:an electroacoustic transducer including a first diaphragm and a driving component, where the first diaphragm is provided on one side of the driving component and is connected to the driving component;a second diaphragm provided on one side of the driving component away from the first diaphragm, the second diaphragm being spaced apart from the electroacoustic transducer; anda housing structure configured to carry the electroacoustic transducer and the second diaphragm, where a space between a side of the second diaphragm close to the driving component and a side of the first diaphragm close to the driving component forms a first cavity with the housing structure, and a space between a side of the electroacoustic transducer close to the second diaphragm and the second diaphragm forms a second cavity with the housing structure; where,in a working state, the driving component drives the first diaphragm to vibrate, the first diaphragm pushes an air spring sealed in the first cavity to vibrate and causes the second diaphragm to passively vibrate with the air spring, and a volume of the second cavity is not greater than ⅕ of an equivalent volume of the electroacoustic transducer.

According to a third aspect, the present application provides an ultra-linear multi-magnetic double-diaphragm loudspeaker, including a support, where a second copper ring is provided inside the support, a first copper ring is provided on an upper surface of the support, a composite diaphragm is provided on one side of the first copper ring and a composite membrane is provided inside the support.

DESCRIPTION OF REFERENCE NUMERALS

DESCRIPTION OF EMBODIMENTS

To make the purposes, technical solutions, and advantages of the present application clearer, the following is a further detailed explanation of this application with reference to the accompanying drawings and specific embodiments.

The following will provide a clear and complete description of the technical solutions in the embodiments of the present application with reference toFIG.1toFIG.13. Obviously, the embodiments described are only some rather than all of embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort shall fall within the protection scope of the present application.

The embodiments of the present application provide an acoustic output apparatus and an earphone, and the earphone may include the acoustic output apparatus. When the acoustic output apparatus or the earphone is worn an ear of a human body, the acoustic output apparatus and the earphone may transmit an acoustic signal to the ear. The acoustic output apparatus and the earphone provided in the embodiments of the present application have excellent bass performance, and can solve the problem of insufficient bass of an earphone in the related art. This will be described thereinafter with reference to the accompanying drawings.

Referring toFIG.1,FIG.1is a schematic diagram of a first structure of an acoustic output apparatus100provided in an embodiment of the present application. The acoustic output apparatus100includes an electroacoustic transducer110, a second diaphragm120and a housing structure130.

The electroacoustic transducer110includes a first diaphragm111and a driving component112, where the first diaphragm111is provided on a first side of the driving component112and is connected to the driving component112. The second diaphragm120is provided on a second side of the driving component112opposite to the first side, and the second diaphragm120may be located on a side of the driving component112away from the first diaphragm111, so that the first diaphragm111, the driving component112and the second diaphragm120are stacked in a direction H1(a thickness direction of the acoustic output apparatus100) from the first side to the second side. Where the second diaphragm120is spaced apart from the electroacoustic transducer110, and there is no physical connection relationship between the second diaphragm120and the electroacoustic transducer110. The housing structure130is configured to carry the electroacoustic transducer110and the second diaphragm120, and a space between a side of the second diaphragm120close to the driving component112and a side of the first diaphragm111close to the driving component112forms a first cavity101with the housing structure130, and the first cavity101may be limited by the first diaphragm111, the second diaphragm120and the housing structure130so as to form a sealed cavity. Air sealed inside the first cavity101may form (or be similar to) an air spring under a vibration force. When the acoustic output apparatus100is in a working state, the driving component112may drive the first diaphragm111to vibrate, and the first diaphragm111may push the air spring sealed inside the first cavity101to vibrate and cause the second diaphragm120to passively vibrate with the air spring. Where a space between a side of the electroacoustic transducer110close to the second diaphragm120and the second diaphragm120forms a second cavity102with the housing structure130, and the second cavity102may be a sub-cavity of the first cavity101, and a volume of the second cavity102is not greater than (less than or equal to) ⅕ of an equivalent volume of the electroacoustic transducer110.

It should be understood that, the equivalent volume of the acoustic output apparatus100means that after the acoustic output apparatus100is placed into a box with a certain internal volume, if an acoustic compliance of the air in the box is exactly equal to that of the acoustic output apparatus100, then the internal volume of the box is the equivalent volume of the acoustic output apparatus100. Where the acoustic compliance can be converted into a force compliance or an equivalent compliance, by an area of a diaphragm of the electroacoustic transducer110, i.e., the first diaphragm111in the present application, and the force compliance can represent a looseness of a suspension system of a sound generation apparatus, such as the acoustic output apparatus100, or a compliance of a displacement after being subjected to a force. The force compliance=the acoustic compliance/S2, where S is the area of the first diaphragm111of the electroacoustic transducer110. In an acoustic output apparatus100or a sound generation apparatus with high compliance, the diaphragm has a large displacement after being subjected to the force, and a low resonance frequency in the case of the same diaphragm mass, and a unit of the compliance is meter per Newton (m/N).

The first diaphragm111in the embodiment of the present application is connected to the driving component112and receives a driving force of the driving component112, and the second diaphragm120is spaced from the driving component112and passively vibrates under the action of the air spring, so that the first diaphragm111, the driving component112, the air spring and the second diaphragm120in the present application can form a double-diaphragm vibration system. Under the action of the vibration of the two diaphragms, the acoustic output apparatus100in the present application can transmit a sound signal to exterior of the acoustic output apparatus100from a side of the first diaphragm111away from the driving component112and a side of the second diaphragm120away from the driving component112. At this time, a low-frequency resonance frequency of the acoustic output apparatus100is influenced by a mass and compliance of the air spring and a mass and compliance of the second diaphragm120.

When a volume of the second cavity102, which is formed by the second diaphragm120, a side of the electroacoustic transducer110close to the second diaphragm120, and the housing structure130, is not greater than ⅕ of an equivalent volume of the electroacoustic transducer110, the volume of the second cavity102is relatively small, the compliance of the air spring is relatively small, and then the elasticity of the air spring is relatively large, so that an energy of the first diaphragm111can be more transferred to the second diaphragm120, and the second diaphragm120may provide a lower low-frequency resonance frequency for the acoustic output apparatus100, and the acoustic output apparatus100may provide a low-frequency signal with a wider frequency spectrum. In this way, the acoustic output apparatus100has excellent bass performance.

In some embodiments, the volume of the second cavity102may be further not greater than ⅙, ⅛, 1/10, 1/15, etc. of the equivalent volume of the electroacoustic transducer110. At this time, the volume of the second cavity102is smaller, the frequency spectrum of the low-frequency signal outputted by the acoustic output apparatus100is wider, and the bass performance of the acoustic output apparatus100is better. The embodiment of the present application does not specifically limit the volume of the second cavity102.

In some embodiments, the driving component112includes a mounting frame1121, a magnetic circuit assembly1122and a voice coil1123, where the magnetic circuit assembly1122may be provided on the mounting frame1121, and the voice coil1123can cut magnetic induction lines of the magnetic circuit assembly1122. The first diaphragm111is fixedly connected to the voice coil1123, and the first diaphragm111can, for example, but is not limited to, be bonded to the voice coil1123through an adhesive. When an electrical signal passes through the voice coil1123, the voice coil1123interacts with the magnetic circuit assembly1122and drives the first diaphragm111to vibrate, and then the first diaphragm111may push the air spring of the first cavity101to vibrate and cause the second diaphragm120to passively vibrate with the air spring, the first diaphragm111may be an active diaphragm of the acoustic output apparatus100, and the second diaphragm120may be a passive diaphragm of the acoustic output apparatus100.

In some embodiments, the second diaphragm120may be fixedly connected to the housing structure130and spaced apart from the driving component112, and the second diaphragm120may, for example, but is not limited to, be bonded and fixed to the housing structure130through an adhesive. There is a gap between the second diaphragm120and a side of the driving component112away from the first diaphragm111, so that the second diaphragm120is a passive diaphragm of the acoustic output apparatus100.

In the acoustic output apparatus100of the embodiment of the present application, under the action of the electroacoustic transducer110, the second diaphragm120and the housing structure130, the first diaphragm111, the driving component112, the air spring in the first cavity101, and the second diaphragm120may form a double-diaphragm vibration sound generation system. Under the vibration of the two diaphragms, the acoustic output apparatus100has a small attenuation under a low-frequency sound signal, and the acoustic output apparatus100has an excellent low-frequency performance. Furthermore, when the volume of the second cavity102, which is formed by the second diaphragm120, the side of the electroacoustic transducer110close to the second diaphragm120and the housing structure130, is not greater than1/5of the equivalent volume of the electroacoustic transducer110, the volume of the second cavity102is relatively small, and the energy of the first diaphragm111can be more transferred to the second diaphragm120, and since the second diaphragm120has a certain area (the area of the second diaphragm120in the present application is much larger than a cross-sectional area of a sound guide tube in a sound guide solution using the sound guide tube in the related art), the second diaphragm120has a lower vibration amplitude, and may provide a lower low-frequency resonance frequency for the acoustic output apparatus100, and the acoustic output apparatus100may provide a low-frequency signal having a wider frequency spectrum, so that the acoustic output apparatus100may have better bass performance. Furthermore, since the first cavity101is a sealed space, compared with the solution using the sound guide tube, the acoustic output apparatus100in the present application does not have a frictional sound caused by compressing the air, which can further improve the sound quality of the acoustic output apparatus100. Furthermore, compared with a solution of providing two sets of independent electroacoustic transducers110in the related art, the second diaphragm120in the present application is a passive diaphragm and occupies a smaller space, so that the acoustic output apparatus100and the earphone10in the present application can realize a miniaturized design, and the earphone10is smaller and easier to wear.

In some embodiments, a projection portion where a first orthographic projection of the electroacoustic transducer110on a first reference plane parallel to the first diaphragm111overlaps with a second orthographic projection of the second diaphragm120on the first reference plane has a first area. Among the first and second orthographic projections, the one with the larger area has a second area, and a ratio of the first area to the second area may be 0.7-1 (the ratio may be equal to 0.7 or 1; and numerical ranges in the present application all include end values unless otherwise specified, which will not be repeated hereinafter), and the ratio of the first area to the second area may be greater than or equal to 0.7 and less than or equal to 1. Where, the ratio of the first area to the second area may be 0.8-1, or the ratio may be 0.9-1. Based on a volume formula, when the ratio of the first area to the second area is between 0.7 and 1, the second cavity102, which is formed by the space between the second diaphragm120and the side of the driving component112away from the first diaphragm111together with the housing structure130, has a small volume, and the acoustic output apparatus100has excellent bass performance.

Referring toFIG.2,FIG.2is a schematic diagram of a structure of the second cavity102of the acoustic output apparatus100provided in an embodiment of the present application. In some embodiments, along a direction Hl from a first side to a second side, a thickness DI of the second cavity102may be not greater than (less than or equal to) 3 mm, or the thickness DI of the second cavity102may be not greater than 2 mm, or the thickness DI of the second cavity102may be not greater than 1 mm. The thickness of the second cavity102may be a maximum distance from a side of the driving component112close to the second diaphragm120to the second diaphragm120along the direction Hl from the first side to the second side. Based on the volume formula, when the thickness of the second cavity102is not greater than 3 mm, the volume of the second cavity102is relatively small, and the acoustic output apparatus100may have excellent bass performance.

In some embodiments, the first diaphragm111and the voice coil1123may form a first vibration system, and the second diaphragm120may form a second vibration system. A resonance frequency of the second vibration system may be lower than a resonance frequency of the first vibration system, so that the acoustic output apparatus100has excellent bass performance under action of the two vibration systems. For example, in some embodiments, a ratio of the resonance frequency of the second vibration system to the resonance frequency of the first vibration system may be greater than 0 and not more than (less than or equal to) 0.7; or the ratio of the resonance frequency of the second vibration system to the resonance frequency of the first vibration system is greater than 0 but not more than 0.6; or the ratio of the resonance frequency of the second vibration system to the resonance frequency of the first vibration system is greater than 0 but not more than 0.5.

In some embodiments, the compliance of the second vibration system is greater than the compliance of the first vibration system, and a ratio of the compliance of the second vibration system to the compliance of the first vibration system is not less than (greater than or equal to) 1.5;or the ratio of the compliance of the second vibration system to the compliance of the first vibration system is not less than 2; or the ratio of the compliance of the second vibration system to the compliance of the first vibration system is not less than 3.

It can be understood that in the acoustic output apparatus100of the present application, it can be set that the ratio of the resonance frequency of the second vibration system to the resonance frequency of the first vibration system is not more than 0.7; or it can be set that the ratio of the compliance of the second vibration system to the compliance of the first vibration system is not less than 1.5; or it can be set that both the ratio of the resonance frequency of the second vibration system to the resonance frequency of the first vibration system is not more than 0.7 and the ratio of the compliance of the second vibration system to the compliance of the first vibration system is not less than 1.5. At this time, the second vibration system has relatively large compliance (i.e., relatively small elasticity) and relatively small mass, and the second vibration system can provide a lower low-frequency resonance frequency for the acoustic output apparatus100, thereby improving the bass performance of the acoustic output apparatus100.

In some embodiments, a mass of the second vibration system can be less than a mass of the first vibration system, and a ratio of the mass of the second vibration system to the mass of the first vibration system is not greater than 0.7 (greater than 0 and less than or equal to 0.7); or the ratio of the mass of the second vibration system to the mass of the first vibration system is not greater than 0.6; or the ratio of the mass of the second vibration system to the mass of the first vibration system is not greater than 0.5. At this time, the second vibration system with a smaller mass is more easily driven by the air spring so as to provide a low low-frequency resonance frequency for the apparatus.

In some embodiments, a mass of the second diaphragm120may be less than a mass of the first diaphragm111, that is, the second diaphragm120is lighter than the first diaphragm111, and the second diaphragm120has a smaller mass. At this time, the second diaphragm120is more easily driven by the air spring sealed inside the first cavity101, and the second diaphragm120may provide the acoustic output apparatus100with a lower low-frequency resonance frequency than the first vibration system, so as to further improve the bass performance of the acoustic output apparatus100.

In some embodiments, the compliance of the second diaphragm120may be greater than that of the first diaphragm111, the second diaphragm120is softer than the first diaphragm111, and the second diaphragm120may provide a low low-frequency resonance frequency for the acoustic output apparatus100.

It should be understood that, in the acoustic output apparatus100of the present application, it may be set that the mass of the second diaphragm120is less than the mass of the first diaphragm111, or it may be set that the compliance of the second diaphragm120is greater than the compliance of the first diaphragm111, or it may be set that both the mass of the second diaphragm120is less than the mass of the first diaphragm111and the compliance of the second diaphragm120is greater than the compliance of the first diaphragm111.

In some embodiments, an area of the second diaphragm120(for example, an area of an orthographic projection of the second diaphragm120on a reference plane parallel to the second diaphragm120) may be greater than or equal to an area of the first diaphragm111(for example, an area of an orthographic projection of the first diaphragm111on a reference plane parallel to the first diaphragm111), and a ratio of the area of the second diaphragm120to the area of the first diaphragm111may be not less than 1 (greater than or equal to 1); or the ratio of the area of the second diaphragm120to the area of the first diaphragm111may be not less than 1.3; or the ratio of the area of the second diaphragm120to the area of the first diaphragm111may be not less than 1.5. At this time, the second diaphragm120with a larger area may receive more vibration energy transferred by the air spring, and then the second diaphragm120may further provide the acoustic output apparatus100with a lower low-frequency resonance frequency than the first vibration system to a greater extent, thereby improving the bass performance of the acoustic output apparatus100.

It should be understood that, in the embodiments of the present application, one, two, or three factors of the mass, compliance, and area of the second diaphragm120may be improved, so as to further improve the bass performance of the acoustic output apparatus100. It should be noted that even if the area of the second diaphragm120is larger than that of the first diaphragm111, the mass of the second diaphragm120can be smaller than that of the first diaphragm111by designing such as the material and local thinning structure of the second diaphragm120.

The acoustic output apparatus100in the embodiments of the present application, by improving the factors such as the mass, compliance and area of the second diaphragm120, and the factors such as the resonance frequency, compliance and mass of the first and second vibration systems, the second diaphragm120may receive the vibration energy transferred by the first vibration system to a greater extent and have a low vibration amplitude, and the second diaphragm120may provide a lower low-frequency resonance frequency than the first vibration system to improve the bass performance of the acoustic output apparatus100, thereby reducing nonlinear distortion of the acoustic output apparatus100and the earphone10. Meanwhile, since the first cavity101, which is formed by the space between the side of the second diaphragm120close to the driving component112and the side of the first diaphragm111close to the driving component112and the housing structure130, is a sealed cavity, compared to the sound transmission through the sound guide tube in the related art, such double-diaphragm vibration system of the present application does not have the frictional sound caused by compressing the air, which can further improve the sound quality of the acoustic output apparatus100.

Based on the structure of the foregoing acoustic output apparatus100, referring toFIG.1again, the acoustic output apparatus100may further include a third cavity103.

The third cavity103is formed between a side of the first diaphragm111away from the driving component112and the housing structure130. For example, the housing structure130located on one side of the first diaphragm111away from the driving component112may enclose with the first diaphragm111to form the third cavity103. The housing structure130further includes at least one first sound output hole131, where the first sound output hole131may be provided on the housing structure130at one side of the first diaphragm111away from the driving component112, the first sound output hole131may penetrate the housing structure130along a thickness direction of the housing structure130, and the first sound output hole131may be communicated with the third cavity103so as to achieve acoustic coupling. In a working state, the driving component112may drive the first diaphragm111to vibrate and radiate a sound signal to the third cavity103, where the sound signal may be exported to exterior of the acoustic output apparatus100through the first sound output hole131.

In some embodiments, the housing structure130may be provided with one or more first sound output holes131. Referring toFIG.3,FIG.3is a schematic diagram of a three-dimensional structure of the acoustic output apparatus100provided in an embodiment of the present application. The housing structure130at the side of the first diaphragm111away from the driving component112may include a protrusion structure133and a first surface134, where the protrusion structure133may be connected to and protrude from the first surface134, and the protrusion structure133may be provided with a first end face135, one or more first sound output holes131may be formed on the first end face135. When one first sound output hole131is formed on the first end face135, the first sound output hole131may have a relatively large cross-sectional area, so as to facilitate exporting more sound signals to outside of the acoustic output apparatus100, and when a plurality of first sound output holes131are formed on the first end face135, the plurality of first sound output holes131may be evenly or unevenly spaced and provided on the first end face135.

It should be understood that, the one or more first sound output holes may be provided on the housing structure130that is provided directly opposite to the first diaphragm111, or provided on the housing structure130that is opposite to or not opposite to the first diaphragm111. It should be understood that, as shown inFIG.3, along a width direction H2of the protrusion structure133, when the acoustic output apparatus100or the earphone10is worn on a human body, a minimum distance between an edge of one side of the protrusion structure133or the first end face135(for example, when the acoustic output apparatus100or earphone10is worn on an ear of the human body, an edge of one side of the protrusion structure133or the first end face135closer to the ear) and the first surface134(along the thickness direction Hl of the acoustic output apparatus100) is smaller than a minimum distance between an edge of the other side thereof and the first surface134(along the thickness direction HI of the acoustic output apparatus100), so that the first end face135where the first sound output hole131is located may be an inclined surface (for example, the first end face135inFIG.3is an inclined surface with a lower left side and a higher right side), and a distance from the first sound output hole131to an external acoustic pore of the ear is relatively small, which can further improve the acoustic performance of the acoustic output apparatus100and the earphone10. It should be understood that, as shown inFIG.3, in the width direction H2of the protrusion structure133, when the acoustic output apparatus100or the earphone10is worn on a human body, the first surface134includes a first side edge close to the ear and a second side edge away from the ear. A minimum distance between a projection of the first end face135on the first surface134and the first side edge is smaller than a minimum distance between the projection and the second side edge, so that the first end face135deviates towards the ear (for example, inFIG.3, the first end face135deviates from a central axis of the first surface134extending along a length direction). At this time, the distance between the first sound output hole131and the external acoustic pore of the ear is short, which can further improve the acoustic performance of the acoustic output apparatus100and the earphone10.

It should be understood that the one or more first sound output holes131may be circular, elliptical, polygonal or other irregular shapes, and there is no limitation on this in the embodiments of the present application.

In some embodiments, reference may be made toFIG.4,FIG.4is a schematic diagram of a structure of the third cavity103of the acoustic output apparatus100provided in an embodiment of the present application. Part or entirety of an inner cavity face of the third cavity103may be a first curved face139. Here the first curved face139may be an integral curved face, or may be a plurality of curved faces spaced apart from each other. For example, the inner cavity face of the third cavity103may include a first face136, a second face137, and a third face138, where the first face136and the third face138are provided opposite to each other, and the second face137may be provided opposite to the first diaphragm111; and where the first face136and the second face137, as well as the second face137and the third face138may all be smoothly transitioned and connected by the first curved face139. At this time, the first curved face139may include two curved faces spaced apart from each other. Of course, in another embodiment, one or more of the first face136, the second face137and the third face138may be the first curved face139.

It can be understood that, an arc radius of the first curved face139may be not less than 1.5 mm, or not less than 2 mm, or not less than 2.5 mm, or not less than 3 mm. A radian of the first curved face139may be not less than 30°, or not less than 40°, or not less than 45°. The present application may perform the above-mentioned design on the arc radius or the radian of the first curved face139, or perform the above-mentioned design on both the arc radius and the radian of the first curved face139.

Based on the structure of the acoustic output apparatus100mentioned above, referring toFIGS.1to4again, the acoustic output apparatus100can further include a fourth cavity104.

A side of the second diaphragm120away from the electroacoustic transducer110forms the fourth cavity104with the housing structure130, for example, the housing structure130located at the side of the second diaphragm120away from the electroacoustic transducer110may enclose with the second diaphragm120to form the fourth cavity104. Where the housing structure130further includes at least one second sound output hole132, the second sound output hole132may be provided on the housing structure130at the side of the second diaphragm120away from the electroacoustic transducer110, the second sound output hole132may penetrate the housing structure130along a thickness direction of the housing structure130, and the second sound output hole132may be communicated with the fourth cavity104and achieve an acoustic coupling. In a working state, the driving component112drives the first diaphragm111to vibrate and pushes the air spring to vibrate, causing the second diaphragm120to passively vibrate and radiate a sound signal to the fourth cavity104, and the sound signal is exported to an exterior of the acoustic output apparatus100through the second sound output hole132.

It should be understood that, one or more second sound output holes132may be provided on the housing structure130. The one or more second sound output holes132may be provided on the housing structure130that is provided directly opposite, laterally opposite, or not opposite to the second diaphragm120. The one or more second sound output holes132may be circular, elliptical, polygonal, or other irregular shapes. The position and shape of the second sound output holes132are not limited in the embodiment of the present application.

In some embodiments, reference may be made toFIG.5,FIG.5is a schematic diagram of a structure of the fourth cavity104of the acoustic output apparatus100provided in an embodiment of the present application. Part or entirety of an inner cavity face of the fourth cavity104may be a second curved face143. Here, the second curved face143may be an integral curved face, or may be a plurality of curved faces spaced apart from each other. For example, the inner cavity face of the fourth cavity104may include a fourth face140, a fifth face141and a sixth face142, where the fourth face140and the sixth face142are provided opposite to each other, and the fifth face141may be provided opposite to the second diaphragm120; where the fourth face140and the fifth face141, as well as the fifth face141and the sixth face142may all be smoothly transitioned and connected by the second curved face143. At this time, the second curved face143may include two curved faces spaced apart from each other. Of course, in another embodiment, one or more of the fourth face140, fifth face141, and sixth face142may be the second curved face143.

It can be understood that, an arc radius of the second curved face143may be not less than 1.5 mm, or not less than 2 mm, or not less than 2.5 mm, or not less than 3 mm. A radian of the second curved face143may be not less than 30°, or not less than 40°, or not less than 45°. The present application may perform the above-mentioned design on the arc radius or the radian of the second curved face143, or perform the above-mentioned design on both the arc radius and the radian of the second curved face143.

The acoustic output apparatus100in the embodiments of the present application may include both the third cavity103and the fourth cavity104, and the third cavity103and the fourth cavity104can be a front cavity and a rear cavity of the acoustic output apparatus100, respectively. The acoustic output apparatus100radiates sound outwards through the two cavities and the sound output holes provided on the cavities, and thus the acoustic output apparatus100can have excellent sound generation performance. At the same time, when the inner cavity faces of the third cavity103and the fourth cavity104are in an curved structure, the volume of the third cavity103and the fourth cavity104can be reduced, and a propagation direction of the sound signal in the two cavities can be in arbitrary direction, thereby reducing the probability of generating standing wave energy, so that the acoustic output apparatus100can have excellent acoustic performance.

In order to further reduce an adverse effect caused by the standing wave, reference may be made toFIG.6,FIG.6is a schematic diagram of a second structure of the acoustic output apparatus100provided in an embodiment of the present application. The acoustic output apparatus100may not include the fourth cavity104, for example, the housing structure130may not include the housing structure located at a side of the second diaphragm120away from the electroacoustic transducer110. At this time, the sound generated by the second diaphragm120may directly propagate to an exterior of the acoustic output apparatus100, and a sound signal generated by the second diaphragm120is not easily to produce a reflection phenomenon during propagation process, thereby reducing the probability of generating standing wave energy.

Referring toFIG.7,FIG.7is a schematic diagram of a third structure of the acoustic output apparatus100provided in an embodiment of the present application. The acoustic output apparatus100can further include a protective structure150.

The protective structure150is provided at a side of the second diaphragm120away from the electroacoustic transducer110, the protective structure150can be connected to the housing structure130, and the protective structure150is configured to separate the second diaphragm120from an exterior of the acoustic output apparatus100and is capable of propagating a sound generated by the second diaphragm120to the exterior of the acoustic output apparatus100.

It should be understood that, the protective structure150may be a filter screen structure. For example, the protective structure150may be a metal screen cover or a plate-like structure formed with at least one hole structure.

The acoustic output apparatus100in the embodiments of the present application is provided with the protective structure150, and at this time, the acoustic output apparatus100does not form a fourth cavity104that is formed by a side of the second diaphragm120away from the electroacoustic transducer110and the housing structure130, and the protective structure150substantially does not block or reflect the sound generated by the second diaphragm120or produce other effect on it, and the protective structure150mainly plays a role in protecting the second diaphragm120, and a sound signal generated by the second diaphragm120is not easily to produce a standing wave phenomenon in a propagation process, and the second diaphragm120can directly radiate the sound signal to the exterior of the acoustic output apparatus100to achieve a good sound offset in a far field with a signal generated by the first sound output hole131, so that sound leakage of the acoustic output apparatus100and the headphone10can be reduced.

It should be noted that the acoustic output apparatus100in the present application may include the third cavity103and the fourth cavity104as shown inFIG.1toFIG.5, or may include the third cavity103but not include the fourth cavity104, as shown inFIG.6, or may include the third cavity103, not include the fourth cavity104but include the protective structure150, as shown inFIG.7. Of course, the acoustic output apparatus100in the embodiments of the present application may include the fourth cavity104but not include the third cavity103, or include neither the third cavity103nor the fourth cavity104, or include the protective structure150but not include the third cavity103. The embodiments of the present application do not limit a specific structure of the acoustic output apparatus100.

Reference may be made toFIG.8in combination withFIGS.1to7,FIG.8a schematic diagram of a fourth structure of an acoustic output apparatus provided in an embodiment of the present application. The second diaphragm120of the acoustic output apparatus100of the present application may include a diaphragm body121and a flat central sticker122.

The diaphragm body121includes a middle flat portion1211and a folded ring portion1212, which are sequentially connected, where the folded ring portion1212can protrude from the middle flat portion1211along a side away from the electroacoustic transducer110, the middle flat portion1211can be formed within an area enclosed by the folded ring portion1212, and the folded ring portion1212can be connected to the housing structure130so as to realize a fixed connection between the second diaphragm120and the housing structure130. The flat central sticker122is adhered to a surface of the middle flat portion1211, and the term “adhered” herein refers to that the flat central sticker122is stacked on one side of a surface of the middle flat portion1211and is connected to the surface. For example, the flat central sticker122can be, but is not limited to, adhered to a surface of the middle flat portion1211away from the electroacoustic transducer110. Where at least part of the flat central sticker122can be provided opposite to the middle flat portion1211, and an orthographic projection of at least part of the flat central sticker122on the diaphragm body121can overlap the middle flat portion1211.

In some embodiments, the middle flat portion1211may be provided with a first through hole123, and the first through hole123may penetrate the middle flat portion1211along a thickness direction of the middle flat portion1211, and the first through hole123is conducive to dissipation of heat generated during operation of the electroacoustic transducer110.

In some embodiments, the flat central sticker122may be provided with a second through hole124communicated with the first through hole123. For example, the second through hole124is provided on an area of the flat central sticker122opposite to the middle flat portion1211. The second through hole124may be directly provided opposite to and communicated with the first through hole123, the first through hole123may be communicated with the fourth cavity104through the second through hole124, and the first through hole123and the second through hole124are more conducive to dissipation of heat generated during operation of the electroacoustic transducer110. It should be noted that the second through hole124may also be partially staggered with and communicated with the first through hole123, and specific arrangement positions of the second through hole124and the first through hole123are not limited in the present application.

In some embodiments, the second diaphragm120may further include one or both of a first blocking member and a second blocking member, where the first blocking member includes a mesh structure and can be connected to the diaphragm body121, and the first blocking member can be matched with the first through hole123so as to cover the first through hole123. It can be understood that, the first blocking member may be provided within the first through hole123(including being provided at an opening of the first through hole123in the middle flat portion1211), or the first blocking member may be provided on a side of the middle flat portion1211away from the flat central sticker122and cover the first through hole123. The second blocking member includes a mesh structure, the second blocking member can be connected to the flat central sticker122, and the second blocking member can be matched with the second through hole124and cover the second through hole124. It can be understood that, the second blocking member may be provided in the second through hole124(including being provided at an opening of the second through hole124in the flat central sticker122), or the second blocking member may be provided on a side of the flat central sticker122away from the middle flat portion1211and cover the second through hole124.

It should be understood that, at least one of the first blocking member and the second blocking member may be a waterproof breathable film or a low breathable mesh structure. The waterproof breathable film may be prepared from any one of polytetrafluoroethylene, expanded polytetrafluoroethylene, polyurethane resin, thermoplastic polyurethane elastomer and the like.

The middle flat portion1211of the second diaphragm120in the present application is provided with the first through hole123, the flat central sticker122is provided with the second through hole124, and the second diaphragm120further includes the first blocking member covering the first through hole123and the second blocking member covering the second through hole124. On one hand, the above-mentioned structure of the second diaphragm120can achieve the purpose of waterproofing, and at the same time can dissipate heat generated in operation of the electroacoustic transducer110, and help the internal cavity of the acoustic output apparatus100to relieve pressure, so as to balance gas pressure of the first cavity101and the fourth cavity104.

It should be noted that, the first diaphragm111may also have a structure similar to the second diaphragm120. In this case, the acoustic output apparatus100may further dissipate the heat generated in operation of the electroacoustic transducer110, and the gas pressure of the third cavity103and the fourth cavity104may also be balanced. A specific structure of the first diaphragm111will not be described in detail here. It should be noted that, in the embodiments shown inFIG.1toFIG.7, the first diaphragm111may also include the diaphragm body121and the flat central sticker122.

Based on the acoustic output apparatus100, an embodiment in the present application further provides an earphone10, and the earphone10may be a wireless earphone structure, a wired earphone structure, an in-ear earphone structure, a semi-in-ear earphone structure, an earplug earphone structure, an open earphone structure, or the like. The embodiments in the present application do not limit a specific type of the earphone10.

Referring toFIG.9toFIG.12,FIG.9a schematic diagram of a structure of an earphone10provided in an embodiment of the present application,FIG.10is a schematic structural diagram of the earphone10shown inFIG.9in another direction,FIG.11is a schematic structural diagram of the earphone10shown inFIG.9in still another direction, andFIG.12is a schematic structural diagram of the earphone10shown inFIG.9in yet another direction. The earphone10may include the acoustic output apparatus100according to any one of the foregoing embodiments. The earphone10can further include a functional structure200, an ear hook structure300, and a transition structure400. The acoustic output apparatus100may also be referred to as a sound generation structure of the earphone10.

Reference may be made toFIG.13in combination withFIGS.9to12, andFIG.13is a schematic diagram of an application scenario of the earphone10shown inFIG.9. When the earphone10is worn on a human body, the functional structure200may be located on a rear side of an auricle of a human ear, and part of the functional structure200may be hidden between the rear side of the auricle and a human head, where the rear side of the auricle is a side of the auricle close to the human head. The ear hook structure300is connected to the functional structure200, and the ear hook structure300can be connected to a sound generation structure (i.e., the acoustic output apparatus100) through the transition structure400. The ear hook structure300can support the headphone10to be worn on the auricle, and can enable the transition structure400and the sound generation structure (the acoustic output apparatus100) to be located on a front side of the auricle, where the front side of the auricle is a side of the auricle away from the human head.

It should be understood that, the earphone10can further include a battery, a mainboard and other structure, and the battery and the mainboard may be provided in the functional structure200. Of course, the earphone10can further include other structure, such as but not limited to a Bluetooth antenna module, a USB charging module, etc. This is not limited in the embodiments in the present application.

According to the earphone10in the embodiments of the present application, the first diaphragm111, the driving component112, the air spring in the first cavity101, and the second diaphragm120of the acoustic output apparatus100may form a double-diaphragm vibration sound generation system. Under vibration of the two diaphragms, the attenuation of the acoustic output apparatus100under low-frequency sound signal is relatively small, and when a volume of the second cavity102, which is formed by the second diaphragm120, a side of the electroacoustic transducer110close to the second diaphragm120and the housing structure130, is not greater than ⅕ of an equivalent volume of the electroacoustic transducer110, the volume of the second cavity102is relatively small, and the second diaphragm120may provide a low low-frequency resonance frequency for the acoustic output apparatus100, and the acoustic output apparatus100may provide a low-frequency signal having a wide frequency spectrum, so that the acoustic output apparatus100may have excellent bass performance. Furthermore, since the second cavity102is a sealed space, compared with a solution of using a sound guide tube, the acoustic output apparatus100in the present application does not have a frictional sound caused by compressing the air, which can further improve the sound quality of the acoustic output apparatus100. Furthermore, compared with a solution of providing two sets of independent electroacoustic transducers110in the related art, the second diaphragm120in the present application is a passive diaphragm and occupies a relatively small space, so that the earphone10in the present application can achieve a miniaturized design, and the earphone10is smaller and easier to wear.

Embodiment

As shown inFIG.14toFIG.17, an embodiment of the present application provides an ultra-linear multi-magnetic double-diaphragm loudspeaker, including a first pin1, a second pin2provided on a side of an outer wall of the first pin1, where outer walls of both the first pin1and the second pin2are provided inside a support15, a second copper ring14is provided inside the support15, a second FPC13is provided on one side of interior of the support15, and a first FPC9is provided on the other side of interior of the support15. A first copper ring8is provided on an upper surface of the support15, and a composite diaphragm7is provided on a side of the first copper ring8. An interior of the support15is provided with a composite membrane11, which uses an ultra-linear structure. Ultra-linear loudspeaker refers to that the loudspeaker has a relatively excellent linear frequency response.

A first folded ring3is provided inside the first copper ring8, a magnet5is provided above the composite membrane11, and a first washer6is provided on a side of the magnet5, where the first washer6achieves a buffering effect.

A magnetic conduction plate4is provided above the magnet5, and the magnetic conduction plate4is provided below the first folded ring3, where the magnet5provides an adsorption effect. An outer wall of the support15is provided with upper and lower pairs of first copper rings18, and one side of an interior of the support15is provided with a first side magnet17, where the first side magnet17provides the effect of further adsorption and fixation.

The other side of the interior of the support15is provided with a second side magnet18, and a second washer16is provided both above the second side magnet18and above the first side magnet17, respectively. A second folded ring19is provided below the support15, and a left-right symmetrical voice coil12is provided above the composite membrane11.

The ultra-linear multi-magnetic double-diaphragm loudspeaker uses a square multi-magnetic circuit structure which includes a neodymium-iron-boron magnetic steel, where the magnetic steel is formed by sintering and cutting a rare earth material and has a magnetic field strength much higher than a ferrite magnetic steel; and further uses a composite material to prepare diaphragms (double diaphragms), where a purpose of using the composite diaphragm is to make the diaphragms have improved rigidity, reduced density and appropriate internal damping;where if the mobile phones use the ultra-linear loudspeaker, the sound produced by them will not be distorted when the mobile phones are using the loudspeakers.

The working principle of the ultra-linear multi-magnetic double-diaphragm loudspeaker is as follows: when the ultra-linear multi-magnetic double-diaphragm loudspeaker needs to be used, the first pin1and the second pin2are firstly used to perform convenient mounting, and then the magnetic conduction plate4and the magnet5are to pass through the loudspeaker so as to achieve an adsorption effect, and the apparatus uses a square multi-magnetic circuit structure of neodymium-iron-boron magnetic steel, which is formed by sintering and cutting a rare earth material and has a magnetic field strength much higher than a ferrite magnetic steel, and at the same time, the present apparatus uses a composite material to prepare diaphragms (double diaphragms), and a purpose of using the composite diaphragm is to make the diaphragms have improve rigidity, reduced density and appropriate internal damping.

It should be understood that, in the description of the embodiments in the present application, the orientations or position relationships indicated by the terms “center”, “longitudinal”, “transversal”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, etc. are based on the orientations or position relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the indicated apparatus or component must have a specific orientation or be constructed and operated in a specific orientation, and thus they cannot be understood as a limitation on the present application.

It should be noted that, in the description of the present application, terms such as “first”, “second”, and “third” are only used for distinguishing similar objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, the features defined by “first”, “second”, and “third” may explicitly or implicitly include one or more such features. In the description of the present application, “a plurality of” means two or more than two, unless otherwise specified.

In the present application, unless otherwise specified or limited, the terms “mount”, “connect”, “communicate”, and “fix” should be broadly understood, for example, it may be connection, detachable connection, or integrated; or it may be mechanical connection or electrical connection; or it may be direct connection or indirect connection through an intermediate medium;

or it may be inner communication of two elements or interaction relationships of two elements. For ordinary those skilled in the art, the specific meanings of the above terms in the present application can be understood based on specific circumstances.

In the present application, unless otherwise specified and limited, the wording that a first feature is “above” or “under” a second feature may include an embodiment in which the first feature is in direct contact with the second feature, and may also include an embodiment in which the first feature is not in direct contact with the second feature, but is contacted through another feature between them. Furthermore, the wording that the first feature is “on”, “above” or “on top of” the second feature may include an embodiment in which the first feature is directly or obliquely above the second feature, or just means that a horizontal height of the first feature is higher than that of the second feature. The wording that the first feature is “below”, “under” or “on bottom of” the second feature include an embodiment in which the first feature is directly or obliquely below the second feature, or just means that a horizontal height of the first feature is lower than that of the second feature.

In the present application, the description referring to terms “an embodiment”, “some embodiments”, “example”, “specific example”, or “some examples” means that the specific features, structures, materials, or features described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the specification of the present application, the schematic expressions of the above terms should not be understood as necessarily referring to the same embodiments or examples. Furthermore, the above-described specific features, structures, materials, or characteristics may be combined in an appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and recombine different embodiments or examples described in the specification.

The acoustic output apparatus and the earphone provided in the embodiments of the present application are described in detail in the above. The present application applies specific individual embodiments to illustrate principles and implementation methods of the present application, and the description of the foregoing embodiments is merely used to help understand the methods and core ideas of the present application. At the same time, those skilled in the art may make modifications to the specific embodiments and application scope based on the ideas of the present application. In summary, the contents of this specification should not be understood as a limitation of the present application.