Patent Description:
Nowadays, entertainments such as listening to music and watching movies have become one of the important ways to relax for people. And earphones are usually used in such entertainments.

An earphone having a vented tip is provided by U. Patent Publication NO. The vented tip for the in-the-ear headphones has a core portion to be mounted to a sound output tube of an in-the-ear earphone and a flange portion extending outward from and surrounding the core portion. The vented tip has a) an outer portion formed in the flange portion that is to be in contact with, and thereby form a seal with, a user's ear canal, and b) an inner portion spaced inwards from the outer portion to thereby not form the seal with the user's ear canal. The inner portion has a calibrated perforation or hole formed therein.

An earphone assembly with wingtips is provided by U. Patent Publication NO. The earphone assembly to be worn by a user's ear includes a housing, an audio output component positioned at least partially within the housing, a flex arm extending from a flex free end to a flex housing end held at a housing flex arm location with respect to the housing, and a wing extending from a first wing housing end to a second wing housing end. The flex arm extends along a portion of the wing; and a material of the flex arm is more rigid than a material of the wing.

An earphone is provided by Chinese Patent NO. The earphone includes a shell, the shell is provided with a sound emitting hole, the shell is detachable provided with an earphone rubber cover, the earphone rubber cover is provided with a sound emitting nozzle corresponding to the sound emitting hole, the sound emitting nozzle is obliquely installed relative to a main body of earphone rubber cover, and the earphone rubber cover includes an in-ear earphone rubber cover and a semi in-ear earphone rubber cover, and an in-ear depth of the earphone is adjusted by changing different types of the earphone rubber covers.

In order to explain the technical solutions in the embodiments of the present disclosure or the prior art more clearly, the drawings used in the description of the embodiments or the prior art are briefly introduced below. Obviously, the drawings in the following description are merely some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without paying creative labor.

In order to facilitate understanding of the present disclosure, the present disclosure will be described more fully with reference to the related drawings.

As illustrated in <FIG>, an earphone <NUM> is provided according to an embodiment of the present disclosure. The earphone <NUM> includes a housing <NUM>, a first eartip <NUM>, a second eartip <NUM>, and a speaker <NUM> (illustrated in <FIG>). The first eartip <NUM> and the second eartip <NUM> is configured to detachably cooperate with the housing <NUM> to change a configuration of the earphone <NUM>. The speaker <NUM> is received in the housing <NUM>.

As illustrated in <FIG> and <FIG>, the first eartip <NUM> is flexible and can be assembled to and detached from the housing <NUM>. When the first eartip <NUM> is assembled to the housing <NUM>, a distance between an end of the first eartip <NUM> away from the housing <NUM> and the housing <NUM> is L1. In some embodiments, the first eartip <NUM> is made of silicon.

As illustrated in <FIG> and <FIG>, the second eartip <NUM> is flexible, and can be assembled to and detached from the housing <NUM>. When the second eartip <NUM> is assembled on the housing <NUM>, a distance between an end of the second eartip <NUM> away from the housing <NUM> and the housing <NUM> is L2. L2 is greater than or equal to L1. Thus a distance that the first eartip <NUM> extends in the auditory meatus <NUM> is smaller than a distance that the second eartip <NUM> extends in the auditory meatus <NUM> when received in the auditory meatus <NUM>. In some embodiments, the second eartip <NUM> is made of silicon. When the second eartip <NUM> is assembled to the housing <NUM>, the inner cavity of the housing <NUM> can communicate with the outside, thus the housing <NUM> is easy to ventilate. In the description, terms "communicate(s) with" and "in communication with" may indicate that two cavities which respectively defined by two object are connected with each other. For example, a first cavity in a first vessel communicates with a second cavity in a second vessel by connecting the second vessel to the first vessel, such as a communicating vessel.

When the first eartip <NUM> is assembled to the housing <NUM>, the earphone <NUM> has a structure of a semi-in-ear earphone. As illustrated in <FIG>, when a user wears the earphone <NUM> with the first eartip <NUM>, the first eartip <NUM> is inserted into the auditory meatus <NUM>, and a depth that the earphone <NUM> extends in the auditory meatus <NUM> is relative small. When the second eartip <NUM> is assembled to the housing <NUM>, the earphone <NUM> has a structure of an in-ear earphone. As illustrated in <FIG>, when the user wears the earphone <NUM> with the second eartip <NUM>, the second eartip <NUM> inserts into the auditory meatus <NUM>, and a depth that the earphone <NUM> extends in the auditory meatus <NUM> is larger than that of the first eartip <NUM>.

According to the illustrated embodiment, the earphone <NUM> can switch between two configurations by equipping with the first eartip <NUM> and the second eartip <NUM>. The two configurations include a first configuration and a second configuration. In the first configuration, the first eartip <NUM> is detachably connected to the housing <NUM>, and the first eartip <NUM> is deformed and in contact with the auditory meatus <NUM> when received in the auditory meatus <NUM>. In the second configuration, the second eartip <NUM> is detachably connected to the housing <NUM>, and the second eartip <NUM> is deformed and in contact with the auditory meatus <NUM> when received in the auditory meatus <NUM>. A distance that the first eartip <NUM> extends in the auditory meatus is smaller than a distance that the second eartip <NUM> extends in the auditory meatus when received in the auditory meatus.

As illustrated in <FIG> and <FIG>, when the user wears the earphone <NUM> normally, the speaker <NUM>, the housing <NUM>, the auditory meatus <NUM>, and an eardrum <NUM> of the user cooperatively form a cavity, which is referred to a front cavity <NUM> of the earphone <NUM>. The acoustic characteristics of the front cavity <NUM> directly affect the acoustic performance of the earphone <NUM>. The acoustic characteristics of the front cavity <NUM> mainly include the volume and airtightness of front cavity <NUM>. The acoustic performance of the earphone <NUM> mainly includes a frequency response and a resonance frequency. The airtightness of the front cavity <NUM> of a semi-in-ear headphone and the airtightness of an in-ear headphone are significant different. Therefore, under same conditions, there is a significant difference in the acoustic performances of the semi-in-ear headphone and the in-ear headphone. By changing the airtightness of the front cavity <NUM>, that is, changing the airtightness in the auditory meatus, the acoustic performance of the earphone <NUM> can be changed.

In the earphone <NUM> of the present disclosure, the first eartip <NUM> and the second eartip <NUM> can be detachably assembled to the housing <NUM>, which can change the distance that the earphone <NUM> extends in the auditory meatus. So that the earphone <NUM> can switch between a semi-in-ear earphone and an in-ear earphone, and the acoustic characteristics of the front cavity <NUM> may be adjusted, thereby adjusting the acoustic performance of the earphone <NUM>.

When the first eartip <NUM> is mounted on the housing <NUM>, the earphone <NUM> works as a semi-in-ear earphone. When the user wears the earphone <NUM> with the first eartip <NUM>, the first eartip <NUM> is at least partially received in the auditory meatus <NUM>, which does not generate pressure on the auditory meatus <NUM>, and the first eartip <NUM> is not easy to detach from the auditory meatus <NUM>, and the user experience is better. When the first eartip <NUM> is received in the auditory meatus <NUM>, the first eartip <NUM> can cooperate well with the auditory meatus <NUM>, which may achieve a good sound insulation, and makes the airtightness of the front cavity <NUM> better, and improves the acoustic performance of the earphone <NUM>.

The earphone <NUM> defines a vent channel therein. The vent channel is configured to ventilate the housing <NUM> or the front cavity <NUM>. According to claim <NUM>, the vent channel is a vent hole defined in the housing <NUM>, and the vent hole is in communication with outside the housing <NUM>. In an embodiment, the vent channel may further comprise a notch defined in the housing <NUM> or defined in the second eartip <NUM>, and the notch may be in communication with an interior cavity of the housing <NUM> and outside the housing <NUM>. In a still another embodiment, the vent channel may comprise a gap defined between the housing <NUM> and the second eartip <NUM>, and the gap may be in communication with an interior cavity of the housing <NUM> and outside the housing <NUM>.

When the second eartip <NUM> is mounted on the housing <NUM>, the earphone <NUM> works as an in-ear earphone. When the user wears the earphone <NUM> with the second eartip <NUM>, the second eartip <NUM> is at least partially received in the auditory meatus <NUM>, and the gap or notch is in communication with the auditory meatus <NUM>, which does not generate pressure on the auditory meatus <NUM>, and the second eartip <NUM> is not easy to detach from the auditory meatus <NUM>, and the user experience is better. When the second eartip <NUM> is mounted on the housing <NUM>, the vent channel can reduce the airtightness of the front cavity <NUM>, thereby avoiding a pressure difference between the auditory meatus <NUM> and the outside world, and thereby avoiding an echo of the sound when speaking. Therefore an openness of the sound quality of the earphone <NUM> is improved. When the second eartip <NUM> is assembled to the housing <NUM>, the depth that the earphone <NUM> extends in the auditory meatus <NUM> is smaller than that of a common in-ear earphone. So that the problem of intrusive feeling when the user wears the earphone <NUM> can be weakened. The airtightness of the front cavity <NUM> that is defined by the earphone <NUM> equipped with the first eartip <NUM> is substantially approximate to the airtightness of the front cavity <NUM> that is defined by the earphone <NUM> equipped with the second eartip <NUM>. So that the earphone <NUM> may have similar acoustic characteristics in both conditions of the earphone <NUM> when equipped with the first eartip <NUM> and the second eartip <NUM>. The sound qualities in both the two conditions are not easily affected.

As illustrated in <FIG> and <FIG>, the housing <NUM> includes a rear case <NUM>, a front cover <NUM> connect to the rear case <NUM>, and a sound emitting nozzle <NUM> connected to the front cover <NUM>.

The front cover <NUM> includes an end surface <NUM> and a side surface <NUM> connected the end surface <NUM>. The end surface <NUM> is disposed at an end of the front cover <NUM>. The side surface <NUM> is connected to an outer periphery of the end surface <NUM> to form an outer surface of the housing. The side surface <NUM> is an exterior surface of the front cover <NUM>.

The front cover <NUM> caps at and seals the rear case <NUM>. The front cover <NUM> and the rear case <NUM> cooperatively form an accommodating space. The speaker <NUM> is disposed in the accommodating space. A sound emitting part of the speaker <NUM> faces the front cover <NUM>. The front cover <NUM> and the rear case <NUM> are made of plastic, synthetic resin, or metal, so that the housing <NUM> has a rigid structure and is not easy to be deformed. Therefore the electronic components in the housing <NUM> may be protected by the housing <NUM>. The end surface <NUM> is disposed on an end of the front cover <NUM> away from the rear case <NUM>.

The sound emitting nozzle <NUM> is connected to and protrudes from the end surface <NUM>. The sound emitting nozzle <NUM> is hollow for allowing sounds from the speaker <NUM> to transmit to outside. In some embodiments, the sound emitting nozzle <NUM> is substantially cylindrical. The sound emitting nozzle <NUM> defines a first sound channel <NUM> communicating with the accommodating space. The sound emitted by the speaker <NUM> may pass through the first sound channel <NUM> and transmit to outside.

In some embodiments, the housing <NUM> includes a first holding portion <NUM> connected to the sound emitting nozzle <NUM>. The first holding portion <NUM> is disposed on an end of the sound emitting nozzle <NUM> away from the end surface <NUM>. The first holding portion <NUM> protrudes from an exterior surface of the sound emitting nozzle <NUM>, and configured to engage with the first eartip <NUM> and the second eartip <NUM>.

In one embodiment, the first holding portion <NUM> is substantially cyclic annular and surrounds the sound emitting nozzle <NUM>. A diameter of the cross-sectional contour of the first holding portion <NUM> is larger than that of the sound emitting nozzle <NUM>. So that when the first eartip <NUM> or the second eartip <NUM> is mounted on the housing <NUM>, the first holding portion <NUM> can engage with the first eartip <NUM> or the second eartip <NUM>, thereby avoiding the first eartip <NUM> or the second eartip <NUM> to detach from the housing <NUM>. In another embodiment, the first holding portion <NUM> may include one or more protrude portions disposed on the exterior surface of the sound emitting nozzle <NUM>. In still another embodiment, the contour of a cross-section of the sound emitting nozzle <NUM> may also be a polygon such as a triangle, a quadrangle, or a pentagon, which is not specifically limited herein. In one embodiment, the front cover <NUM>, the sound emitting nozzle <NUM>, and the first holding portion <NUM> cooperatively form an integrative structure.

As illustrated in <FIG> and <FIG>, the first eartip <NUM> is mounted on and detached from the housing <NUM>. The first eartip <NUM> defines a second sound channel <NUM> therein. When the first eartip <NUM> is mounted on the housing <NUM>, the first sound channel <NUM> may communicate with the second sound channel <NUM>. So that the sound emitted by the speaker <NUM> can pass through the first sound channel <NUM> and the second sound channel <NUM> and transmit to outside.

The first eartip <NUM> is hollow, and includes a first interior wall <NUM> and a second holding portion <NUM>. The first interior wall <NUM> defines the second sound channel <NUM>. In the first configuration, the first eartip <NUM> encircles the sound emitting nozzle <NUM> via the first interior wall <NUM>. The second holding portion <NUM> is disposed on and protrudes from the first interior wall <NUM>. Thus the second holding portion <NUM> is disposed in the second sound channel <NUM>. The second holding portion <NUM> is configured to engage with the first holding portion <NUM> so that the first eartip <NUM> is assembled to the housing <NUM> to avoid the first eartip <NUM> detaching from the housing <NUM>. The second holding portion <NUM> is flexible and elastic. During the process of assembling the first eartip <NUM> to the housing <NUM>, as the first eartip <NUM> approaching the housing <NUM>, the second holding portion <NUM> is deformed and in contact with the first holding portion <NUM>. Because the first holding portion <NUM> is harder and the second holding portion <NUM> is more flexible, the second holding portion <NUM> is deformed to provide a channel for the first holding portion <NUM> by squeezing, by which the second holding portion <NUM> can move to a side of the first holding portion <NUM> that facing the front cover <NUM>. The first holding portion <NUM> and the second holding portion <NUM> are engaged with each other. An interference fit is formed between the second holding portion <NUM> and the surface of the sound emitting nozzle <NUM>, thereby preventing air from flowing between the second holding portion <NUM> and the surface of the sound emitting nozzle <NUM>. In an embodiment, the first eartip <NUM> may be made of a soft material such as rubber, resin, and silicon, and the first eartip <NUM> is an integrative structure.

As illustrated in <FIG>, the second eartip <NUM> is mounted on and detached from the housing <NUM>. The second eartip <NUM> defines a third sound channel <NUM> therein. When the second eartip <NUM> is mounted on the housing <NUM>, the first sound channel <NUM> communicates with the third sound channel <NUM>. So that the sound emitted by the speaker <NUM> can pass through the first sound channel <NUM> and the third sound channel <NUM> and transmit to outside.

The second eartip <NUM> is hollow, and includes a second interior wall <NUM> and a third holding portion <NUM>. The second interior wall <NUM> defines the third sound channel <NUM>. In the second configuration, the second eartip <NUM> encircles the sound emitting nozzle <NUM> via the second interior wall <NUM>. The third holding portion <NUM> is disposed on and protrudes from the second interior wall <NUM>. Thus the third holding portion <NUM> is disposed in the third sound channel <NUM>. The third holding portion <NUM> is configured to engage with the first holding portion <NUM> so that the second eartip <NUM> can be assembled to the housing <NUM> to avoid the second eartip <NUM> detaching from the housing <NUM>. The third holding portion <NUM> is disposed in the third sound channel <NUM> is flexible and is elastic. During the process of assembling the second eartip <NUM> to the housing <NUM>, as the second eartip <NUM> approaching the housing <NUM>, the third holding portion <NUM> is deformed and in contact with and the first holding portion <NUM>. Because the first holding portion <NUM> is harder and the third holding portion <NUM> is more flexible, the third holding portion <NUM> is deformed to provide a channel for the first holding portion <NUM> by squeezing, by which the third holding portion <NUM> can move to a side of the first holding portion <NUM> that facing the front cover <NUM>. The first holding portion <NUM> and the third holding portion <NUM> are engaged with each other. An interference fit is formed between the third holding portion <NUM> and the surface of the sound emitting nozzle <NUM>, thereby preventing air from flowing between the third holding portion <NUM> and the surface of the sound emitting nozzle <NUM>. In an embodiment, the second eartip <NUM> may be made of soft material such as rubber, resin, and silicon, and the second eartip <NUM> is an integrative structure.

As illustrated in <FIG>, the front cover <NUM> defines a vent hole <NUM> therein. The vent hole <NUM> extends to the end surface <NUM>, that is, the vent hole <NUM> penetrates the front cover <NUM> in a thickness direction of the front cover <NUM>. So that the air in the housing <NUM> can flow out. The vent hole <NUM> is adjacent to the sound emitting nozzle <NUM> but apart from the sound emitting nozzle <NUM> for a certain distance. When the first eartip <NUM> is mounted on the housing <NUM>, the first eartip <NUM> is stacked on the end surface <NUM> and in contact with the side surface <NUM> smoothly. Thus the vent hole <NUM> is covered by the first eartip <NUM>. The contour of the edge of the first eartip <NUM> coincides with the contour of the edge of the end surface <NUM>. The first eartip <NUM> and the housing <NUM> form an integral shape, and the first eartip <NUM> covers and seals the vent hole <NUM>. The distance between an end of the first eartip <NUM> away from the housing <NUM> and the end surface <NUM> is L1.

When the user wears the earphone <NUM> with the first eartip <NUM>, the first eartip <NUM> is inserted into the auditory meatus <NUM>. The depth that the first eartip <NUM> extends in the auditory meatus <NUM> is relatively small, and the rest of the earphone <NUM> is maintained outside the auditory meatus <NUM>. The first eartip <NUM> is closely fitted to the auditory meatus <NUM> and can be deformed according to the shape of the auditory meatus <NUM>. So that the seal between the earphone <NUM> and the auditory meatus <NUM> is better, and the airtightness of the front cavity <NUM> is better than a common semi-in-ear headphone. Therefore a sound insulation of the headphones <NUM> is better, and the low-frequency response of acoustic performance is better. For different people, the first eartip <NUM> may be designed in different sizes according to different sizes of the auditory meatus <NUM> of people, so that the earphone <NUM> of the present disclosure can be adapted to different people.

As illustrated in <FIG>, in an embodiment, an outside diameter of the first eartip <NUM> is smaller than that of the second eartip <NUM>. When the second eartip <NUM> is mounted on the housing <NUM>, an area surrounded by the contour of the edge of the second eartip <NUM> is smaller than an area surrounded by the contour of the edge of the end surface <NUM>. The second eartip <NUM> is apart from the end surface <NUM>. Thus the vent hole <NUM> is exposed, and there is a gap between the second eartip <NUM> and the end surface <NUM>. The distance between the end of the second eartip <NUM> away from the housing <NUM> and the end surface <NUM> is L2. L2 is greater than L1. Therefore, a distance that the first eartip <NUM> extends in the auditory meatus <NUM> is smaller than a distance that the second eartip <NUM> extends in the auditory meatus <NUM> when received in the auditory meatus.

When the user wears the earphone <NUM> with the second eartip <NUM>, the second eartip <NUM> is inserted into the auditory meatus <NUM>. A depth that the second eartip <NUM> extends in the auditory meatus <NUM> is relatively larger. The rest of the earphone <NUM> is maintained outside the auditory meatus <NUM>. The second eartip <NUM> can be closely fitted to the auditory meatus <NUM> and can be deformed according to the shape of the auditory meatus <NUM> to improve the comfort of the user. The vent hole <NUM> of the earphone <NUM> will not be covered by the second eartip <NUM>, so that the air in the housing <NUM> can flow out from the vent hole <NUM>, which can reduce the airtightness of the front cavity <NUM>, and can solve the problem of poor wearing experience caused by the difference in air pressure between the inside and outside the auditory meatus <NUM>, also makes the airtightness and acoustic characteristics of the earphone <NUM> that works as the in-ear structure closer to that of the earphone <NUM> works as the semi-in-ear earphone. Therefore, the sound qualities of the earphone <NUM> that works as the semi-in-ear and the in-ear are substantially the same. For different people, the second eartip <NUM> may be designed in different sizes according to different sizes of the auditory meatus <NUM> of people, so that the earphone <NUM> of the present disclosure can be adapted to different people.

In another embodiment, the sound emitting nozzle <NUM> protrudes from the end surface <NUM> of the front cover <NUM>. In a non claimed example, the vent hole <NUM> is defined in the wall of the sound emitting nozzle <NUM> and is located at an end of the sound emitting nozzle <NUM> adjacent to the end surface <NUM>. When the first eartip <NUM> is mounted on the housing <NUM>, the vent hole <NUM> is covered and sealed by the second holding portion <NUM>. Thus the airtightness of the front cavity <NUM> is better than that of a common semi-in-ear earphone, which may achieve a better sound insulation of the earphone <NUM>, and the low frequency response of acoustic performance is better. When the second eartip <NUM> is mounted on the housing <NUM>, the vent hole <NUM> is located by a side of the third holding portion <NUM> adjacent to the end surface <NUM>, so that the vent hole <NUM> is not sealed by the third holding portion <NUM>. That is, the vent hole <NUM> is not covered or sealed by the second eartip <NUM> and exposed, so that the air in the first sound channel <NUM> can flow out from the vent hole <NUM>, which can reduce the airtightness of the front cavity <NUM>, and can solve the problem of poor wearing experience caused by the difference in air pressure between the inside and outside the auditory meatus <NUM>, also makes the airtightness and acoustic characteristics of the earphone <NUM> that works as the in-ear structure closer to that of the earphone <NUM> works as the semi-in-ear earphone. Therefore, the sound qualities of the earphone <NUM> that works as the semi-in-ear and the in-ear are substantially the same.

As illustrated in <FIG>, in an embodiment, the vent channel comprises a gap defined by the second eartip <NUM> and the housing <NUM>. When the second eartip <NUM> is mounted on the housing <NUM>, the third holding portion <NUM> is engaged with the first holding portion <NUM>. There is a gap <NUM> between the third holding portions <NUM> and the sound emitting nozzle <NUM>. The gap <NUM> defines the vent channel of the earphone <NUM>. The airtightness between the second eartip <NUM> and the sound emitting nozzle <NUM> may be reduced via the gap <NUM>. So that the air in the housing <NUM> can pass through the first sound channel <NUM>, the third sound channel <NUM>, and the gap <NUM> in sequence and flow out, thereby reducing the airtightness of the front cavity <NUM>, and solving the problem of poor wearing experience caused by the difference in air pressure between the inside and outside the auditory meatus <NUM>, also makes the airtightness and acoustic characteristics of the earphone <NUM> that works as the in-ear structure closer to that of the earphone <NUM> works as the semi-in-ear earphone. Therefore, the sound qualities of the earphone <NUM> that works as the semi-in-ear and the in-ear are substantially the same.

In some embodiments, the vent channel comprises a notch defined in the second eartip <NUM>. As illustrated in <FIG>, the third holding portion <NUM> of the second eartip <NUM> defines a notch <NUM> therein. When the second eartip <NUM> is mounted on the housing <NUM>, the third holding portion <NUM> is engaged with the first holding portion <NUM>. The notch <NUM> in the third holding portion <NUM> defines the vent channel of the earphone <NUM>. So that the air in the housing <NUM> can pass through the first sound channel <NUM>, the third sound channel <NUM>, and the gap <NUM> in sequence and flow out, thereby reducing the airtightness of the front cavity <NUM>, and solving the problem of poor wearing experience caused by the difference in air pressure between the inside and outside the auditory meatus <NUM>, also makes the airtightness and acoustic characteristics of the earphone <NUM> that works as the in-ear structure closer to that of the earphone <NUM> works as the semi-in-ear earphone. Therefore, the sound qualities of the earphone <NUM> that works as the semi-in-ear and the in-ear are substantially the same.

In the earphone <NUM> provided by the present disclosure, the first eartip <NUM> and the second eartip <NUM> having different sizes and shapes can be detachably mounted on the housing <NUM>. The depth of the ear of the earphone <NUM> may be changed via the first eartip <NUM> and the second eartip <NUM>. So that the earphone <NUM> can be used as a semi-in-ear earphone or an in-ear earphone, which can adjust the acoustic characteristics of the front cavity <NUM>, thereby adjusting the acoustic performance of the headphones <NUM>. When the first eartip <NUM> is mounted on the housing <NUM>, the earphone <NUM> works as a semi-in-ear earphone. When the user wears the earphone <NUM> with the first eartip <NUM>, the first eartip <NUM> is inserted into the auditory meatus <NUM>, which does not generate pressure on the auditory meatus <NUM> and is not easy to detach from the auditory meatus <NUM>, and the user experience is better. When the first eartip <NUM> is received in the auditory meatus <NUM>, the first eartip <NUM> can cooperate well with the auditory meatus <NUM>, which may achieve a good sound insulation, and makes the airtightness of the front cavity <NUM> better, and improves the acoustic performance of the earphone <NUM>.

Claim 1:
An earphone (<NUM>), comprising:
a housing (<NUM>), defining an interior space therein, the housing (<NUM>) comprising a front cover (<NUM>) and a sound emitting nozzle (<NUM>) connected to the front cover (<NUM>); the front cover (<NUM>) comprising an end surface (<NUM>) disposed on an end thereof; the sound emitting nozzle (<NUM>) protruding from the end surface (<NUM>); the housing (<NUM>) defining a vent hole (<NUM>) in the front cover (<NUM>); the vent hole (<NUM>) penetrating the end surface (<NUM>);
a first eartip (<NUM>), configured to be mounted on the sound emitting nozzle (<NUM>); and
a second eartip (<NUM>), configured to be mounted on the sound emitting nozzle (<NUM>);
wherein one of the first eartip (<NUM>) and the second eartip is selectively mounted on the housing (<NUM>);
wherein,
when the second eartip (<NUM>) is mounted on the sound emitting nozzle (<NUM>), the earphone (<NUM>) works as an in-ear earphone, and there is a gap between the second eartip (<NUM>) and the end surface (<NUM>), such that the vent hole (<NUM>) in the end surface (<NUM>) is exposed and communicates with the interior space and the exterior of the housing (<NUM>); and
when the first eartip (<NUM>) is mounted on the housing (<NUM>), the earphone (<NUM>) works as a semi in-ear earphone, and the first eartip (<NUM>) is in contact with the end surface (<NUM>), thereby sealing the vent hole (<NUM>).