Open earphones
The present disclosure provides an open earphone, including: a sound production component including: a transducer including a diaphragm configured to generate a sound; and a housing forming a cavity used to accommodate the transducer, wherein in a wearing state, the housing is provided with a sound guiding hole on an inner side surface toward an auricle of a user for guiding a sound generated by a front side of the diaphragm out of the housing and into an ear canal, and at least two pressure relief holes are provided on one or more other side surfaces of the housing, the at least two pressure relief holes including a first pressure relief hole away from the ear canal and a second pressure relief hole near the ear canal, and a sound pressure at the first pressure relief hole being greater than a sound pressure at the second pressure relief hole.
1 . An open earphone, comprising:
a sound production component including:
a transducer including a diaphragm configured to generate a sound under an action of an excitation signal; and
a housing, the housing forming a cavity used to accommodate the transducer, wherein
in a wearing state, the housing is provided with a sound guiding hole on an inner side surface toward an auricle of a user for guiding a sound generated by a front side of the diaphragm out of the housing and into an ear canal of the user, and
at least two pressure relief holes are provided on one or more other side surfaces of the housing, the at least two pressure relief holes including a first pressure relief hole away from the ear canal and a second pressure relief hole near the ear canal, and a sound pressure at the first pressure relief hole being greater than a sound pressure at the second pressure relief hole, wherein the at least two pressure relief holes are configured to guide sounds generated by a rear side of the diaphragm out of the housing.
2 . The open earphone of claim 1 , wherein the first pressure relief hole and the second pressure relief hole are respectively located on different side surfaces of the housing.
3 . The open earphone of claim 2 , wherein a ratio of an area of the first pressure relief hole to an area of the second pressure relief hole is in a range of 1 to 5.
4 . The open earphone of claim 2 , wherein a ratio of a long axis dimension to a short axis dimension of the first pressure relief hole is in a range of 1.3 to 8.
5 . The open earphone of claim 4 , wherein a ratio of a long axis dimension to a short axis dimension of the second pressure relief hole is in a range of 1 to 6.
6 . The open earphone of claim 2 , wherein a ratio of an area of the sound guiding hole to a total area of the first pressure relief hole and the second pressure relief hole is in a range of 0.1 to 0.99; and
the diaphragm divides the cavity into a front cavity and a rear cavity corresponding to the front side and a rear side of the diaphragm, respectively, wherein a ratio of a volume of the rear cavity to a volume of the front cavity is in a range of 0.1 to 10.
7 . The open earphone of claim 6 , wherein the diaphragm divides the cavity into a front cavity and a rear cavity corresponding to the front side and a rear side of the diaphragm, respectively, wherein a ratio of a resonance frequency of the front cavity to a resonance frequency of the rear cavity is in a range of 0.1 to 5.
8 . The open earphone of claim 2 , wherein a ratio of an area of the sound guiding hole to a total area of the first pressure relief hole and the second pressure relief hole is in a range of 1 to 10; and
the diaphragm divides the cavity into a front cavity and a rear cavity corresponding to the front side and the rear side of the diaphragm, respectively, wherein a ratio of a resonance frequency of the front cavity to a resonance frequency of the rear cavity is in a range of 0.5 to 10.
9 . The open earphone of claim 2 , wherein a ratio of an area of the sound guiding hole to a square of a depth of the sound guiding hole is in a range of 0.31 to 512.2.
10 . The open earphone of claim 2 , wherein a ratio of a long axis dimension to a short axis dimension of the sound guiding hole is in a range of 1 to 10.
11 . The open earphone of claim 2 , wherein in a range of 3.5 kHz to 4.5 kHz, a ratio of a sound pressure at the sound guiding hole to a total sound pressure at the first pressure relief hole and the second pressure relief hole is in a range of 0.4 to 0.6.
12 . The open earphone of claim 2 , wherein in a range of 3.5 kHz to 4.5 kHz, a ratio of a sound pressure at the sound guiding hole to the sound pressure at the first pressure relief hole is in a range of 0.9 to 1.1.
13 . The open earphone of claim 2 , wherein in a range 3.5 kHz to 4.5 kHz, a ratio of a sound pressure at the sound guiding hole to the sound pressure at the second pressure relief hole is in a range 0.9 to 1.1.
14 . The open earphone of claim 1 , wherein acoustic resistance nets are provided at the sound guiding hole and at the at least two pressure relief holes, respectively, wherein the acoustic resistance nets provided at the sound guiding hole or the at the at least two pressure relief holes include a gauze mesh or a steel mesh.
15 . The open earphone of claim 14 , wherein
an acoustic impedance rate of the gauze mesh is in a range of 2 MKS rayls to 50 MKS rayls; and
an acoustic impedance rate of the steel mesh is in a range of 0.1 MKS rayls to 10 MKS rayls.
16 . The open earphone of claim 14 , wherein a distance between an upper surface of the acoustic resistance net at the first pressure relief hole towards an exterior of the housing and an outer surface of the housing is in a range of 0.8 mm to 0.9 mm.
17 . The open earphone of claim 14 , wherein a distance between an upper surface of the acoustic resistance net at the second pressure relief hole towards an exterior of the housing and an outer surface of the housing is in a range of 0.7 mm to 0.8 mm.
18 . The open earphone of claim 14 , wherein thicknesses of the acoustic resistance nets at the at least two pressure relief holes are in a range of 40 μm to 150 μm.
19 . The open earphone of claim 14 , wherein the acoustic resistance net at the sound guiding hole includes a gauze mesh and an etched steel mesh.
20 . The open earphone of claim 14 , wherein an acoustic resistance net at the sound guiding hole and acoustic resistance nets at the at least two pressure relief holes have a same acoustic impedance rate.