JP2017103581A - earphone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earphone which allows communication between a space in an external acoustic meatus and an external space of a housing with a simple structure to inhibit reduction of movability of an eardrum when worn.SOLUTION: An earphone includes: a driver unit 2 which generates acoustic waves according to an electric signal; a housing 1 for housing the driver unit; a sound guide tube 3 which allows communication between a front surface side space S1 of the driver unit and a space in an external acoustic meatus to which the sound waves are led; a first communication hole 12 which allows communication between the external space of the housing and a back surface side space S2 of the driver unit; a second communication hole 14 which allows communication between the back surface side space of the driver unit and a front surface side space of the driver unit; and an on-off valve 51 which opens or closes the second communication hole 14.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an earphone.

  There are various types of earphones, such as ear-hook type, headphone type, and separate type. One type of earphone is an earplug type earphone (hereinafter referred to as “canal type earphone”).

  The canal type earphone includes a driver unit that generates a sound wave according to an electric signal, a housing in which the driver unit is housed, a sound conduit that communicates a space on the front side of the driver unit with a space in the ear canal through which the sound wave is guided. And an earpiece attached to the sound conduit. A user of a canal-type earphone (hereinafter referred to as “user”) uses an earpiece inserted into the ear canal.

  The earpiece is in close contact with the inner wall of the user's ear canal. As a result, the space in the ear canal is sealed with the earpiece. Here, the space in the ear canal means a space formed by the inner wall of the user's ear canal, the eardrum, and the earphone when the earpiece and the inner wall of the user's ear canal are in close contact. Sound waves from the driver unit reach the user's tympanic membrane through a sealed space in the ear canal. For this reason, the canal type earphone achieves a high reproduction sound quality. Further, the sound insulation characteristics of the canal type earphone are superior to those of other types of earphones.

  When the canal-type earphone is worn on the user's ear (when worn), the user's earphone seals the space in the ear canal while pushing air in the ear canal toward the eardrum. Therefore, the pressure in the space inside the ear canal becomes higher than the pressure (atmospheric pressure) in the space outside the housing. As a result, a pressure difference occurs between the space inside and outside the user's eardrum, that is, the space in the ear canal and the space in the ear canal, and the mobility of the user's eardrum is reduced. The pressure difference in the space inside and outside the user's eardrum is adjusted by the ear canal and decreases with time. However, the pressure in the space in the ear canal and the pressure in the space in the ear canal are still higher than the pressure in the space outside the housing.

  On the other hand, when the canal-type earphone is unloaded from the user's ear (when unloaded), the space in the ear canal communicates with the space outside the housing. Therefore, the pressure in the space in the ear canal becomes equal to the atmospheric pressure. As a result, a pressure difference is generated in the space inside and outside the user's eardrum, and the mobility of the user's eardrum is reduced.

  When canal earphones are frequently attached and detached, the pressure difference due to the ear canal cannot be adjusted in time. That is, the state where the mobility of the user's eardrum is reduced, that is, the state where it is difficult to hear sound continues.

  In the past, in order to suppress a decrease in the mobility of the eardrum of the user, a vent pipe that connects the space inside the ear canal and the space outside the housing and an on-off valve that opens and closes the vent pipe have been formed. Earphones have been proposed (see, for example, Patent Document 1).

  The vent pipe is opened when the on-off valve is pushed down by the user's finger. When the vent pipe is opened, the space outside the housing communicates with the space inside the ear canal. As a result, no pressure difference occurs in the space inside and outside the user's eardrum. That is, the mobility of the user's eardrum does not decrease.

JP 2008-147710 A

  However, in the earphone described in Patent Document 1, a protrusion is provided on the outer peripheral surface of the housing, and a groove is formed inside the protrusion. This groove constitutes a vent pipe that communicates the space in the ear canal and the space outside the housing. Thus, the earphone described in Patent Document 1 requires a protrusion for forming a groove on the outer peripheral surface of the housing, and the structure of the earphone is complicated.

  The present invention has been made in order to solve the above-described problems of the prior art, and by connecting the space inside the ear canal and the space outside the housing with a simple structure, It aims at suppressing the fall of mobility.

  The earphone according to the present invention is a sound that communicates a driver unit that generates a sound wave according to an electric signal, a housing that houses the driver unit, a space on the front side of the driver unit, and a space in the ear canal that guides the sound wave. A conduit, a first communication hole that communicates the space outside the housing and the space on the back side of the driver unit, and a second communication hole that communicates the space on the back side of the driver unit and the space on the front side of the driver unit. And an on-off valve that opens and closes the second communication hole.

  According to the present invention, it is possible to suppress a decrease in the mobility of the eardrum during attachment / detachment.

It is right side sectional drawing which shows embodiment of the earphone concerning this invention. FIG. 2 is a right side cross-sectional view showing a state in which an opening / closing valve of an opening / closing mechanism provided in the earphone of FIG. 1 is opened. FIG. 3 is a right side cross-sectional view showing a state where an opening / closing valve of an opening / closing mechanism provided in the earphone of FIG. 1 is fixed at a closed position. FIG. 2 is a right side cross-sectional view showing a state where an opening / closing valve of an opening / closing mechanism provided in the earphone of FIG. 1 is fixed at an open position. FIG. 2 is a right side cross-sectional view schematically showing a state in which the earphone of FIG. 1 is attached to a user's ear. It is right side sectional drawing which shows another embodiment of the earphone concerning this invention. FIG. 5 is a right side cross-sectional view showing a state in which an opening / closing valve of an opening / closing mechanism included in the earphone of FIG. 4 is opened. It is right side sectional drawing which shows another embodiment of the earphone concerning this invention. FIG. 7 is a right side cross-sectional view showing a state where an opening / closing valve of an opening / closing mechanism included in the earphone of FIG. 6 is opened.

  Hereinafter, embodiments of an earphone according to the present invention will be described with reference to the drawings.

● Earphone (1) ●
First, the configuration of the earphone according to the present invention will be described.

FIG. 1 is a right side cross-sectional view showing an embodiment of an earphone according to the present invention.
The format of the earphone 100 is a canal type earphone. The earphone 100 includes a housing 1, a driver unit 2, a sound conduit 3, an earpiece 4, and an opening / closing mechanism 5.

  The housing 1 accommodates the driver unit 2 and supports the opening / closing mechanism 5. The housing 1 has an insertion hole through which the protruding portion 11, the first communication hole 12, the support hole 13, and the sound conduit 3 are inserted. The housing 1 is made of ABS resin or the like. The housing 1 is a hollow body.

  The protrusion 11 holds the driver unit 2 in the housing 1. The protruding portion 11 is formed such that a part of the inner peripheral surface of the housing 1 protrudes inside the housing 1 over the entire circumference. A groove, which will be described later, is formed on a part of the inner peripheral surface of the protruding portion 11.

  The first communication hole 12 communicates the space outside the housing 1 with the space inside the housing 1 and on the back side of the driver unit 2. The first communication hole 12 is formed on the outer peripheral surface of the housing 1.

  The support hole 13 supports the opening / closing mechanism 5. The support hole 13 is formed through a part of the outer peripheral surface of the housing 1. A groove 13 a described later is formed on the inner peripheral surface of the support hole 13.

  The driver unit 2 generates a sound wave according to an electric signal from a musical sound player to which the earphone 100 is connected. The driver unit 2 has a diaphragm 21. The driver unit 2 has a circular disc shape in plan view.

  The diaphragm 21 vibrates according to the electrical signal and generates a sound wave. The diaphragm 21 is made of synthetic resin or the like. The diaphragm 21 includes a dome-shaped center dome and a sub-dome having an arc-shaped cross section surrounding the outer periphery of the center dome.

  The space inside the housing 1 is divided into a space on the front side (left side of the paper) of the driver unit 2 (hereinafter referred to as “space S1”) and a back side (paper surface) of the driver unit 2 by the driver unit 2 housed in the housing 1. And a right side space (hereinafter referred to as “space S2”). As described above, the first communication hole 12 allows the space outside the housing 1 to communicate with the space S2.

  The groove formed in a part of the inner peripheral surface of the protrusion 11 described above faces the outer peripheral surface of the driver unit 2. A second communication hole 14 is formed in the housing 1 by the groove of the protruding portion 11 and the outer peripheral surface of the driver unit 2. The second communication hole 14 communicates the space S1 and the space S2.

  The sound conduit 3 guides the sound wave from the driver unit 2 to the ear canal of the user of the earphone 100 (hereinafter referred to as “user”). The sound conduit 3 is cylindrical. The sound conduit 3 is inserted into the insertion hole of the housing 1 and protrudes from the housing 1. The sound conduit 3 communicates a space in the ear canal described later and the space S1.

  The earpiece 4 is inserted into the user's ear canal. The earpiece 4 inserted into the user's ear canal is in close contact with the inner wall of the user's ear canal. The earpiece 4 is made of an elastic body such as rubber. The earpiece 4 has an umbrella shape. The earpiece 4 is formed with an insertion hole into which the sound conduit 3 is inserted. The earpiece 4 is attached to the outer peripheral surface of the sound conduit 3.

  The opening / closing mechanism 5 controls the communication state between the space S1 and the space S2. Here, the first communication hole 12 allows the space S2 and the space outside the housing 1 to communicate with each other. That is, the opening / closing mechanism 5 communicates the space S1 and the space outside the housing 1 through the space S2. The opening / closing mechanism 5 includes an opening / closing valve 51, a moving part 52, and a fixed part 53.

  The on-off valve 51 opens and closes the second communication hole 14. The on-off valve 51 is made of synthetic resin or the like. The on-off valve 51 has a plate shape that closes the opening end of the second communication hole 14 on the space S2 side. The on-off valve 51 is disposed in the space S2. One surface of the on-off valve 51 faces the opening end of the second communication hole 14 on the space S2 side. The other surface of the on-off valve 51 is connected to the moving unit 52.

  In a state in which the on-off valve 51 is in contact with the opening end of the second communication hole 14 on the space S2 side and the second communication hole 14 is closed (hereinafter referred to as “closed state”), the space S1 and the outside of the housing 1 are outside. There is no communication with space. In a state where the on-off valve 51 is separated from the opening end of the second communication hole 14 on the space S2 side and the second communication hole 14 is opened (hereinafter referred to as “open state”), the space S1 and the space outside the housing 1 are opened. And communicate.

  The moving part 52 moves the on-off valve 51 so that the closed state and the open state are switched. The moving part 52 is made of synthetic resin or the like. The moving part 52 is rod-shaped. The moving part 52 is formed with a protrusion 52a and a leaf spring part. Details of the protrusion 52a and the leaf spring portion will be described later. One end of the moving part 52 is connected (fixed) to the other surface of the on-off valve 51. The other end of the moving part 52 is inserted through the support hole 13 and exposed to the outside of the housing 1. That is, the moving part 52 is supported by the support hole 13.

FIG. 2 is a right side sectional view of the earphone 100 in an open state.
The figure shows that the first communication hole 12, the space S <b> 2, the second communication hole 14, the space S <b> 1, and the space in the sound conduit 3 communicate with each other by the movement of the moving part 52. That is, when the moving part 52 moves to the right in the drawing, the on-off valve 51 opens the second communication hole 14 away from the opening end of the second communication hole 14 on the space S2 side. As a result, the space S1 communicates with the space outside the housing 1 through the second communication hole 14 and the space S2.

FIG. 3 is a partially enlarged view of the earphone 100 in the closed state.
A leaf spring portion is formed in a cantilever shape on the moving portion 52. The leaf spring part can be elastically deformed so that the free end approaches the axial center side (inside) of the moving part 52. The protrusion 52a is formed on the free end side of the leaf spring part. That is, the protrusion 52 a can advance and retreat inside the moving part 52. The protrusion 52a and the groove 13a described above constitute a fixing portion 53 that fixes the position of the moving portion 52.

  In the closed state, the protrusion 52 a comes into contact with the inner peripheral surface of the housing 1. The movement of the on-off valve 51 in the direction exposed from the housing 1 (the right side of the drawing) is limited by the protrusion 52a. Therefore, the on-off valve 51 is in contact with the open end of the second communication hole 14 on the space S2 side, and is fixed at a position where the second communication hole 14 is closed (hereinafter referred to as “closed position”). That is, in a state where the protrusion 52a is in contact with the inner peripheral surface of the housing 1, the on-off valve 51 is fixed at the closed position, and the space S1 and the space outside the housing 1 are not communicated, that is, the closed state is maintained. Is done.

  In a closed state, when a predetermined force is applied to the opening / closing mechanism 5 in a direction in which the moving portion 52 is exposed from the housing 1 (rightward in the drawing) by a predetermined operation, the free end of the leaf spring portion is guided to the surface of the protrusion 52a. Then, it retracts inside the moving part 52 together with the protrusion 52a. At this time, the moving part 52 is movable in the support hole 13 in a state where the protrusion 52 a is in contact with the inner peripheral surface of the support hole 13.

FIG. 4 is a partially enlarged view of the earphone 100 in the opened state.
When the protrusion 52a reaches the groove 13a from a position where it comes into contact with the outer peripheral surface of the housing 1, the protrusion 52a returns to the state before retraction due to the restoring force of the leaf spring portion. That is, the protrusion 52a engages with the groove 13a. The movement of the on-off valve 51 in the direction of the second communication hole (leftward in the drawing) and the movement in the direction exposed from the housing 1 (rightward in the drawing) are limited by engagement. For this reason, the on-off valve 51 is fixed at a position (hereinafter referred to as “open position”) where the second communication hole 14 is opened apart from the opening end of the second communication hole 14 on the space S2 side. That is, in the state where the groove 13a and the protrusion 52a are engaged, the on-off valve 51 is fixed at the open position, and the state where the space S1 and the space outside the housing 1 communicate with each other, that is, the open state is maintained.

  The engagement between the groove 13a and the protrusion 52a and the contact between the protrusion 52a and the inner peripheral surface of the housing 1 are released when the user moves the moving part 52 by operating the moving part 52. In other words, the on-off valve 51 is fixed in the open position or the closed position until the moving unit 52 is operated. As a result, an open state or a closed state is maintained.

  The number of grooves 13a and protrusions 52a need not be the same. That is, for example, when the number of protrusions is 2 and the number of grooves is 1, in the earphone according to the present invention, the on-off valve 51 is fixed in the open position by one protrusion and fixed in the closed position by the other protrusion. . Further, for example, when the number of protrusions is 1 and the number of grooves is 2, the earphone according to the present invention has the on-off valve 51 fixed in the open position by one groove and fixed in the closed position by the other groove. .

● Operation of Earphone Next, the operation of the earphone 100 will be described.
Here, the case where the earphone 100 in the closed state in which the protrusion 52a is in contact with the inner peripheral surface of the housing 1 is mounted on the user's ear will be described as an example.

FIG. 5 is a right side cross-sectional view of the earphone 100 attached to the user's ear.
The figure shows a state in which the earpiece 4 is inserted into the user's ear canal. A part of the earpiece 4 is in close contact with the inner walls EC1 and EC2 of the user's ear canal. Here, the inner wall of the user's external auditory canal is shown using separate symbols EC1 and EC2 for convenience of the following description. At this time, the space inside the ear canal (hereinafter referred to as “space S3”) and the other space (hereinafter referred to as “space S4”) excluding the space S3 among the spaces outside the housing 1 can communicate with each other. . That is, the space S3 and the space S4 can communicate with each other through the first communication hole 12, the space S2, the second communication hole 14, the space S1, and the space in the sound conduit 3. Here, the space in the ear canal is a space defined by the inner walls EC1 and EC2 of the user's ear canal, the eardrum E of the user, and the earpiece 4, and communicates with the space S1 via the sound conduit 3. Say.

  When the earphone 100 is worn on the user's ear, the earpiece 4 is inserted into the user's ear canal while pushing the air inside the ear canal toward the eardrum E. Therefore, the earpiece 4 is in close contact with the inner walls EC1 and EC2 of the user's ear canal. Since the on-off valve 51 closes the second communication hole 14, the space S3 is sealed. As a result, the pressure in the space S3 becomes higher than the pressure (atmospheric pressure) in the space S4. While the closed state in which the protrusion 52a is in contact with the inner peripheral surface of the housing 1 is maintained, the pressure in the space S3 is maintained in a state higher than the pressure in the space S4.

  In the closed state, when the moving part 52 moves in the direction exposed from the housing 1 (rightward in the drawing) by the operation of the opening / closing mechanism 5, the opening / closing valve 51 is separated from the opening end of the second communication hole 14 on the space S2 side, The second communication hole 14 is opened. As an example of the operation of the opening / closing mechanism 5, there is an operation in which a portion of the moving unit 52 exposed to the outside of the housing 1 is pulled to the outside of the housing 1 by a user's finger. The moving part 52 moves to a position where the protrusion 52a engages with the groove 13a.

  In the open state, the space S3 and the space S4 communicate with each other through the space in the sound conduit 3, the space S1, the second communication hole 14, the space S2, and the first communication hole 12. That is, the sealed state of the space S3 is released. As a result, the pressure in the space S3 decreases to the pressure in the space S4 (atmospheric pressure) and becomes the same as the pressure in the space S4. While the open state in which the protrusion 52a is engaged with the groove 13a is maintained, the communication between the space S3 and the space S4 is maintained.

  In the open state, the sound of the space S4, that is, the sound from the outside, is used through the first communication hole 12, the space S2, the second communication hole 14, the space S1, the space in the sound conduit 3, and the space S3. Reaches the eardrum E of the person. That is, the user can hear a sound outside the housing 1 (for example, a conversation sound) in a state where the earphone 100 is attached to the user's ear. Therefore, the user does not have to remove the earphone 100 from the ear in order to hear the sound outside the housing 1.

  In the open state, when the moving part 52 moves in the direction opposite to the direction exposed from the housing 1 (leftward in the drawing) by the operation of the opening / closing mechanism 5, the opening / closing valve 51 is moved from the opening end of the second communication hole 14 on the space S2 side. In contact therewith, the second communication hole 14 is closed. As an example of the operation of the opening / closing mechanism 5, there is an operation in which the portion of the moving part 52 exposed to the outside of the housing 1 is pushed into the housing 1 with a user's finger. The moving part 52 moves to a position where the protrusion 52 a comes into contact with the inner peripheral surface of the housing 1.

  When the open / close valve 51 is closed from the open state to the closed state and the second communication hole 14 is closed, the space S3 is sealed with the pressure (atmospheric pressure) of the space S4.

Summary According to the embodiment described above, the earphone 100 includes the opening / closing mechanism 5 that allows the space S1 and the space S4 to communicate with each other. The opening / closing mechanism 5 can control the communication between the space S3 and the space S4 with a simple structure in which the opening / closing valve 51 is moved to open and close the second communication hole 14 when the moving unit 52 is operated. That is, according to the earphone 100 according to the present embodiment, it is possible to eliminate the pressure difference between the space S3 and the space S4 with a simple structure, and to suppress the decrease in the mobility of the user's eardrum E.

  Further, in the open earphone 100, the user can hear a sound (for example, conversation sound) outside the housing 1 in a state where the earphone 100 is attached to the user's ear. Therefore, the user does not have to remove the earphone 100 from the ear in order to hear the sound outside the housing 1.

  The embodiment described above is the case where the closed earphone 100 is put on the ear and then opened to eliminate the pressure difference between the pressure in the space S3 and the pressure in the space S4. Instead of this, for example, when the earphone 100 in an open state in which the space S3 and the space S4 are in communication is worn on the ear, there is no pressure difference between the pressure in the space S3 immediately after wearing and the pressure in the space S4. Therefore, the mobility of the eardrum E of the user's ear does not decrease even when the earphone 100 is worn.

● Earphone (2) ●
Next, another embodiment of the earphone according to the present invention will be described with a focus on differences from the above-described embodiment.

Configuration of Earphone The earphone according to the present embodiment is different from the above-described embodiment in that the opening / closing mechanism 5 includes an urging portion. Moreover, the earphone according to the present embodiment is different from the above-described embodiment in that the fixing unit 53 is not provided.

FIG. 6 is a right side cross-sectional view showing another embodiment of the earphone according to the present invention.
Earphone 200 has an opening / closing mechanism 5A. The opening / closing mechanism 5 </ b> A includes an opening / closing valve 51, a moving part 52, and an urging part 54.

  The urging unit 54 urges the opening / closing valve 51 in the direction in which the opening / closing valve 51 closes the second communication hole 14 (left direction in the drawing). The urging unit 54 is, for example, a coil spring through which the moving unit 52 is inserted. The urging unit 54 is disposed in the space S2. The on-off valve 51 is fixed at the closed position by the urging force of the urging unit 54. That is, the urging unit 54 corresponds to the fixing unit 53 in the embodiment described above.

● Operation of Earphone Next, the operation of the earphone 200 will be described.
Here, a case where the closed earphone 200 is attached to the user's ear will be described as an example.

  In the closed state, when the opening / closing mechanism 5 </ b> A is operated and the moving part 52 moves in the direction exposed from the housing 1, the opening / closing valve 51 opens the second communication hole 14 against the urging force from the urging part 54. As an example of the operation of the opening / closing mechanism 5A, there is an operation in which a portion of the moving portion 52 exposed to the outside of the housing 1 is pulled by a user's finger.

FIG. 7 is a right side cross-sectional view of the earphone 200 in the opened state.
The figure shows that the first communication hole 12, the space S <b> 2, the second communication hole 14, the space S <b> 1, and the space in the sound conduit 3 communicate with each other by the movement of the moving part 52. That is, when the moving portion 52 moves to the right in the drawing, the on-off valve 51 is separated from the opening end of the second communication hole 14 on the space S2 side, and the space outside the housing 1 and the space S1 are connected to the second communication hole 14. And the space S2.

  When the user's finger is released from the moving part 52 in the open state, the moving part 52 is moved (moved leftward in the drawing) by the urging force of the urging part 54, and the on-off valve 51 passes through the second communication hole 14. close up.

Summary According to the embodiment described above, the earphone 200 can fix the opening / closing valve 51 in the closed position by the biasing portion 54 as long as the opening / closing mechanism 5A is not operated.

  In the earphone according to the present embodiment, a fixing portion that fixes the on-off valve 51 that maintains the open state against the biasing force of the biasing portion 54 may be provided. For example, the fixing portion is configured by the groove 13a and the protrusion 52a in the above-described embodiment. By providing the fixing portion that maintains the open state, the open state can be maintained in the earphone that is normally maintained in the closed state by the biasing force of the biasing portion 54.

  The moving part of the earphone in the embodiment described above has a rod shape. However, the moving part of the earphone according to the present invention may be anything that moves the on-off valve 51, and may be linear or string-like.

  That is, for example, a linear or string-like member (hereinafter referred to as “string material”) inserted into the support hole 13 of the housing 1 may be used instead of the rod-shaped moving portion 52 in the above-described embodiment.

  As another example of the string member as the moving part, one end thereof is connected (fixed) to the surface of the opening / closing valve 51 on the space S2 side, and the other end is connected to the inner side of the connection cord film (not shown). It may be a string member connected to the figure. The connection cord has a core wire that guides an electrical signal to the driver unit 2 and a coating that protects the core wire. The connection cord is inserted into a bushing (not shown) provided outside the housing 1. The core wire is inserted into the inside of the tubular coating.

  Here, the coating is movable with respect to the bushing and the core wire. In other words, the bushing and the core wire are not affected by the movement of the coating. That is, the connection between the core wire and the driver unit 2 is maintained.

  As described above, the string material as the moving part is connected to the inside of the coating. The moving unit moves according to the movement of the coating. That is, in the closed state, when the coating is operated and the moving part moves, the on-off valve 51 opens the second communication hole 14. As an example of the operation of the coating, there is an operation in which the coating of the connection cord exposed to the outside of the housing 1 is pulled by a user's finger.

  In the open state, when the user's finger is separated from the coating of the connection cord, for example, the moving part moves to the second communication hole 14 side by the urging force of the urging part, and the on-off valve 51 moves through the second communication hole 14. close up.

  When the string member connected to the coating is used as the moving part, a support hole for supporting a part of the moving part in the housing is not required as in the embodiment described above.

● Earphone (3) ●
Next, still another embodiment of the earphone according to the present invention will be described with a focus on differences from the above-described embodiment.

● Configuration of Earphone The earphone according to the present embodiment is different from the embodiments described so far in that the opening / closing mechanism 5 has an operation unit. Further, the earphone according to the present embodiment is different from the embodiment shown in FIG. 1 in that the fixing unit 53 is not provided.

FIG. 8 is a right side cross-sectional view showing still another embodiment of the earphone according to the present invention.
Earphone 300 has an opening / closing mechanism 5B.

  The opening / closing mechanism 5 </ b> B includes an opening / closing valve 51, a moving unit 52, an urging unit 54, and an operation unit 55.

  The operation unit 55 moves the moving unit 52 in the right direction of the drawing by being operated by being held by the user's finger of the earphone 300. As a result, the second communication hole 14 is opened. The operation unit 55 is an elastic body, for example, a leaf spring. The operation part 55 includes a first spring part 55a and a second spring part 55b. The first spring part 55a and the second spring part 55b are arranged symmetrically (for example, vertically) with respect to the moving part 52.

One end of the first spring portion 55 a is joined to the upper part (upper side of the drawing) than the support hole 13 formed on the outer peripheral surface of the housing 1. The other end of the first spring part 55a is joined to the other end of the moving part 52 (the opening / closing valve 51 is fixed to one end of the moving part 52). The first spring portion 55a is attached between the surface of the housing 1 where the support hole 13 is formed and the other end of the moving portion 52 so as to protrude upward in the drawing. One end of the second spring portion 55 b is joined to the lower portion (lower side of the drawing) than the support hole 13 formed on the outer peripheral surface of the housing 1. The other end of the second spring part 55b is joined to the other end of the moving part 52 (the opening / closing valve 51 is fixed to one end of the moving part 52). The second spring portion 55b is attached between the surface of the housing 1 where the support hole 13 is formed and the other end of the moving portion 52 so as to protrude downward in the drawing.
● Earphone operation

FIG. 9 is a right side cross-sectional view of the earphone 300 in the opened state.
When the operation unit 55 is pressed with the finger of the user of the earphone 300 and pressed in the direction of the moving unit 52 (in the direction of the arrow in the figure), each of the first spring unit 55a and the second spring unit 55b Deforms so that both ends of the direction are separated. As a result, the moving unit 52 moves in the direction in which the on-off valve 51 opens the second communication hole 14 (rightward in the drawing) against the urging force of the urging unit 54.

  In the open state, when the finger of the user of the earphone 300 moves away from the operation unit 55 and the pressure on the operation unit 55 is released, the urging force of the urging unit 54 causes the moving unit 52 to cause the on-off valve 51 to be in the second communication. It moves in the direction of closing the hole 14 (left direction on the paper).

Summary According to the embodiment described above, the earphone 300 can move the on-off valve 51 by operating the operation unit 55 that moves the moving unit 52 fixed to the on-off valve 51. In other words, the earphone 300 can move the on-off valve 51 without causing the user to directly operate the moving unit 52.

  In the earphone of the present embodiment, there may be provided a fixing portion that fixes the on-off valve 51 that maintains the open state against the urging force of the urging portion 54 or the operation portion 55. For example, the fixing portion is configured by the groove 13a and the protrusion 52a in the above-described embodiment. By providing the fixing portion that maintains the open state, the open state can be maintained in the earphone that is normally maintained in the closed state by the urging force of the urging unit 54 and the operation unit 55.

DESCRIPTION OF SYMBOLS 1 Housing 11 Protruding part 12 1st communicating hole 13 Support hole 13a Groove 14 2nd communicating hole 2 Driver unit 21 Diaphragm 3 Sound conduit 4 Earpiece 5 Opening / closing mechanism 51 Opening / closing valve 52 Moving part 52a Protrusion 53 Fixing part 100 Earphone 54 Energizing Part 200 earphone 55 operation part 55a first spring part 55b second spring part 300 earphone E eardrum EC1 inner wall EC2 of the ear canal inner wall S1 space on the front side of the driver unit S2 space on the back side of the driver unit S3 space S4 on the outer ear canal Space outside the housing

Claims (10)

A driver unit that generates sound waves according to electrical signals;
A housing that houses the driver unit;
A sound conduit that communicates the space on the front side of the driver unit with the space in the ear canal through which the sound waves are guided;
A first communication hole for communicating a space outside the housing with a space on the back side of the driver unit;
A second communication hole for communicating the space on the back side of the driver unit with the space on the front side of the driver unit;
An on-off valve for opening and closing the second communication hole;
Having
Earphone characterized by that. A moving part connected to the on-off valve;
With
When the moving part moves, the on-off valve opens and closes the second communication hole.
The earphone according to claim 1. A part of the moving part is exposed to the outside of the housing;
The earphone according to claim 2. An urging portion that urges the on-off valve in a direction in which the on-off valve closes the second communication hole;
Comprising
The earphone according to claim 2. An operation unit for moving the moving unit;
Comprising
The earphone according to claim 2. A fixing part for fixing the position of the moving part;
Comprising
The earphone according to claim 2. The fixing part is
A protrusion formed on the moving part;
A groove formed in the housing;
With
The protrusion engages with the groove;
The earphone according to claim 6. The protrusion is capable of moving back and forth inside the moving part.
The earphone according to claim 7. When the protrusion is engaged with the groove, the on-off valve opens the second communication hole.
The earphone according to claim 7. When the protrusion is in contact with the inner peripheral surface of the housing, the on-off valve closes the second communication hole;
The earphone according to claim 7.

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