Acoustic devices
The present disclosure provides an acoustic device. The acoustic device may include a housing, a transducer, and a diaphragm. The housing may be configured to form a cavity. The transducer may be arranged in the cavity and connected to the housing. The housing may produce a bone-conduction sound under an action of the transducer. The diaphragm may be connected between the transducer and the housing to divide the cavity into a first cavity and a second cavity. The housing may be provided with at least one pressure relief hole communicating with the first cavity and at least one sound modulation hole communicating with the second cavity. At least a portion of the at least one pressure relief hole and at least a portion of the at least one sound modulation hole may be arranged adjacently. The housing may be further provided with a sound outlet hole communicating with the second cavity. The diaphragm may produce an air-conduction sound transmitted outward through the sound outlet hole during a relative movement of the transducer and the housing.
1 . An acoustic device, comprising:
a housing configured to form a cavity;
a transducer arranged in the cavity and connected to the housing, wherein the housing produces a bone-conduction sound under an action of the transducer; and
a diaphragm connected between the transducer and the housing to divide the cavity into a first cavity and a second cavity,
wherein the housing is provided with:
at least one pressure relief hole communicating with the first cavity,
at least one sound modulation hole communicating with the second cavity, at least a portion of the at least one pressure relief hole being arranged adjacent to at least a portion of the at least one sound modulation hole, and
a sound outlet hole communicating with the second cavity, the diaphragm producing an air-conduction sound transmitted outward through the sound outlet hole during a relative movement of the transducer and the housing,
wherein
a containing region is arranged on an outer surface of the housing,
a bulge is formed inside the containing region,
outlet ends of the sound modulation hole and the pressure relief hole that are arranged adjacently are located on top of the bulge, and
the bulge and a side wall of the containing region are spaced to form a containing groove surrounding the bulge.
2 . The acoustic device of claim 1 , wherein
the at least one pressure relief hole includes a first pressure relief hole and a second pressure relief hole,
the first pressure relief hole is arranged away from the sound outlet hole relative to the second pressure relief hole, and
an area of an outlet end of the first pressure relief hole is larger than an area of an outlet end of the second pressure relief hole.
3 . The acoustic device of claim 2 , wherein
the at least one sound modulation hole includes a first sound modulation hole and a second sound modulation hole,
the first sound modulation hole is arranged away from the sound outlet hole relative to the second sound modulation hole,
an area of an outlet end of the first sound modulation hole is larger than an area of an outlet end of the second sound modulation hole,
the first pressure relief hole is arranged adjacent to the first sound modulation hole, and
the second pressure relief hole is arranged adjacent to the second sound modulation hole.
4 . The acoustic device of claim 2 , wherein
the at least one pressure relief hole further includes a third pressure relief hole,
the first pressure relief hole is arranged away from the sound outlet hole relative to the third pressure relief hole, and
the area of the outlet end of the second pressure relief hole is larger than an area of an outlet end of the third pressure relief hole.
5 . The acoustic device of claim 2 , wherein the sound outlet hole and the first pressure relief hole are arranged on two opposite sides of the transducer.
6 . The acoustic device of claim 1 , wherein a distance between the pressure relief hole and the sound modulation hole that are arranged adjacently is less than or equal to 2 mm.
7 . The acoustic device of claim 1 , wherein for the pressure relief hole and the sound modulation hole that are arranged adjacently, an area of an outlet end of the pressure relief hole is larger than an area of an outlet end of the sound modulation hole.
8 . The acoustic device of claim 1 , wherein the outlet ends of the pressure relief hole and the sound modulation hole that are arranged adjacently are covered with a first acoustic resistance mesh and a second acoustic resistance mesh, respectively, a porosity of the first acoustic resistance mesh is greater than a porosity of the second acoustic resistance mesh.
9 . The acoustic device of claim 8 , wherein
the acoustic device further includes a protective cover,
the protective cover covers periphery of the pressure relief hole and the sound modulation hole that are arranged adjacently, and
the first acoustic resistance mesh and the second acoustic resistance mesh are arranged on a side, close to the housing, of the protective cover.
10 . The acoustic device of claim 9 , wherein the protective cover includes a main cover plate covering the pressure relief hole and the sound modulation hole that are arranged adjacently, the first acoustic resistance mesh and the second acoustic resistance mesh being fixed to a side, facing the pressure relief hole and the sound modulation hole, of the main cover plate.
11 . The acoustic device of claim 10 , wherein
the protective cover includes an annular side plate,
the annular side plate is bent and connected to an edge of the main cover plate, and
the annular side plate is inserted into the containing groove and fixedly connected to the housing through an adhesive in the containing groove.
12 . The acoustic device of claim 11 , wherein
the acoustic device further includes a first annular film,
the first annular film surrounds the pressure relief hole and the sound modulation hole that are arranged adjacently, and
the first acoustic resistance mesh and the second acoustic resistance mesh are fixed to the top of the bulge through the first annular film.
13 . The acoustic device of claim 11 , wherein
the acoustic device further includes a second annular film,
the second annular film surrounds the pressure relief hole and the sound modulation hole that are arranged adjacently, and
the first acoustic resistance mesh and the second acoustic resistance mesh are fixed to the main cover plate through the second annular film.
14 . The acoustic device of claim 1 , wherein the acoustic device includes a baffle plate and an auxiliary device, wherein
the baffle plate is arranged in the second cavity and divides the second cavity into a first sub-cavity close to the first cavity and a second sub-cavity away from the first cavity,
the sound outlet hole is communicated with the first sub-cavity,
the auxiliary device includes at least one of a button or a microphone, and
a portion of the auxiliary device is arranged in the second sub-cavity.
15 . The acoustic device of claim 1 , wherein a frequency response curve of the bone-conduction sound has at least one resonant peak satisfying an equation:
| f 1− f 2|/ f 1≤50%
where f1 refers to a resonant frequency of a resonant peak of the bone-conduction sound when the diaphragm is connected to the transducer and the housing, and f2 refers to a resonant frequency of a resonant peak of the bone-conduction sound when the diaphragm is disconnected from either of the transducer and the housing.
16 . The acoustic device of claim 1 , wherein
the outlet ends of the pressure relief hole and the sound modulation hole that are arranged adjacently are covered with a first acoustic resistance mesh and a second acoustic resistance mesh, respectively,
the acoustic device further includes a protective cover, the protective cover covering periphery of the pressure relief hole and the sound modulation hole that are arranged adjacently, the first acoustic resistance mesh and the second acoustic resistance mesh being arranged on a side, close to the housing, of the protective cover, and
the protective cover includes a main cover plate covering the pressure relief hole and the sound modulation hole that are arranged adjacently, the first acoustic resistance mesh and the second acoustic resistance mesh being fixed to a side, facing the pressure relief hole and the sound modulation hole, of the main cover plate.
17 . The acoustic device of claim 16 , wherein
the acoustic device further includes a second annular film,
the second annular film surrounds the pressure relief hole and the sound modulation hole that are arranged adjacently, and
the first acoustic resistance mesh and the second acoustic resistance mesh are fixed to the main cover plate through the second annular film.
18 . The acoustic device of claim 1 , wherein
the acoustic device further includes a protective cover, the protective cover covering periphery of the pressure relief hole and the sound modulation hole that are arranged adjacently, and
the protective cover includes:
a main cover plate covering the pressure relief hole and the sound modulation hole that are arranged adjacently, and
an annular side plate, the annular side plate being bent and connected to an edge of the main cover plate, the annular side plate being inserted into the containing groove and fixedly connected to the housing through an adhesive in the containing groove.
19 . The acoustic device of claim 1 , wherein
the outlet ends of the pressure relief hole and the sound modulation hole that are arranged adjacently are covered with a first acoustic resistance mesh and a second acoustic resistance mesh, respectively,
the acoustic device further includes a first annular film, the first annular film surrounding the pressure relief hole and the sound modulation hole that are arranged adjacently, and
the first acoustic resistance mesh and the second acoustic resistance mesh are fixed to the top of the bulge through the first annular film.
20 . The acoustic device of claim 1 , wherein the at least a portion of the at least one pressure relief hole is arranged adjacent to the at least a portion of the at least one sound modulation hole, so that sound leakage output outside of the acoustic device through the pressure relief hole and the sound modulation hole that are arranged adjacently interferes and cancels each other.