JP2020043547A - Earphone speaker - Google Patents

Abstract

To provide an earbud type earphone speaker capable of reducing harsh sounds.SOLUTION: A speaker for earphone 100 includes: a speaker body 120 having a diaphragm 121, which is located inside the cylindrical insertion portion 113 that is inserted into the human ear canal; and an annular protective member 130 for protecting the diaphragm 121, which forms a resonance space 132 which is located in front of the diaphragm 121 and has an opening 133 opening toward a sound path 131 through which the sounds emitted from the diaphragm 121 passes.SELECTED DRAWING: Figure 4

Description

  The present disclosure relates to a speaker used for an earphone of a type inserted into an ear canal.

  2. Description of the Related Art Conventionally, an earphone as described in Patent Document 1 has a structure in which a cylindrical port is provided in a housing for accommodating a small speaker, and an earpiece is attached to an outer periphery of the port. Further, the audio signal is supplied to the speaker from the outside via a cable, and the sound generated from the speaker passes through the sound path formed by the port and the earpiece and is transmitted into the outer ear.

JP 2013-157735 A

  Recently, attempts have been made to arrange a speaker used for an earphone in a port inserted into an ear canal. However, when such an earphone is attached to the external auditory canal, there is a problem that it is difficult to suppress the generation of unpleasant sounds in terms of audible sound quality because the distance between the diaphragm of the speaker and the eardrum is short.

  Therefore, an object of the present invention is to provide an earphone speaker that can suppress generation of harsh sound even when the speaker is arranged at a position close to the eardrum.

  In order to achieve the above object, a speaker for an earphone, which is one of the present invention, is disposed inside a cylindrical insertion portion to be inserted into a human ear canal, and a speaker main body having a diaphragm, A resonance space having an opening portion that is disposed on a front side of the diaphragm and that opens toward a sound path through which a sound generated by the diaphragm passes, and has a through hole that allows the sound to pass therethrough, An annular protection member for protecting the plate.

  ADVANTAGE OF THE INVENTION The speaker for earphones which concerns on this invention can utilize the resonance effect of Helmholtz by a protection member, and can suppress generation | occurrence | production of annoying sound. In addition, the protection member can prevent the diaphragm arranged at a position close to the exposed state from being touched by a finger or the like.

FIG. 2 is a perspective view illustrating an appearance of the earphone according to the embodiment. FIG. 2 is an exploded perspective view showing the earphone according to the embodiment. FIG. 2 is an exploded perspective view showing a speaker portion of the earphone according to the embodiment. It is a figure showing the section of the earphone concerning an embodiment. It is a perspective view which disassembles and shows the protection member of this Embodiment from the back. It is a top view which shows the base part by omitting the cover part of the protective member of this Embodiment. It is a top view which shows another example of a protection member by omitting a cover part. FIG. 11 is an exploded perspective view showing another example of the protection member having different positions of the openings. It is sectional drawing of the speaker main body part which mounted the protection member of another example. It is a perspective view which shows the protection member from which the position of an opening differs from another example disassembled. It is sectional drawing of the speaker main body part which mounted the protection member of another example.

  Hereinafter, an earphone according to one embodiment of the present invention will be specifically described with reference to the drawings. Each of the embodiments described below shows one specific example of the present invention. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, processes, order of processes, and the like shown in the following embodiments are merely examples, and do not limit the present invention. In addition, among the components in the following embodiments, components not described in the independent claims indicating the highest concept are described as arbitrary components.

  FIG. 1 is a perspective view showing the appearance of the earphone according to the embodiment. FIG. 2 is an exploded perspective view showing the earphone according to the embodiment. FIG. 3 is an exploded perspective view showing a speaker portion of the earphone according to the embodiment. FIG. 4 is a diagram illustrating a cross section of the earphone according to the embodiment. As shown in these drawings, the earphone 100 is an earphone that is inserted into and held in a human ear canal, and includes a housing 110, a speaker 129, and an earpiece 140. Further, in the case of the present embodiment, earphone 100 is a wireless earphone in which speakers 129 arranged on left and right ears are not connected by wires, and includes circuit board 151 having a communication function, and battery 152. I have.

  The housing 110 is a structural member that houses the speaker 129, the circuit board 151, the battery 152, and the like, and includes a housing main body 111 and a lid 112. The housing 110 includes a cylindrical insertion portion 113 that is inserted into a human ear canal. The distal end of the insertion portion 113 is provided with a flange portion 114 projecting outward to engage with the earpiece 140. In addition, the insertion part 113 does not need to be completely inserted into the human ear canal, and may be one in which only a part of the insertion part 113 is inserted. Further, the insertion portion 113 may be held in the external auditory canal via the earpiece 140.

  The earpiece 140 is a member that is detachably attached to and held by the insertion portion 113, and is directly inserted into a human ear canal to hold the earphone 120 in the ear canal. In addition, the earpiece 140 includes a sound path 139 that guides the sound emitted from the speaker body 120 into the external auditory canal. The sound path 139 is a space from the diaphragm 121 (described later) of the speaker 129 to the eardrum holding the earpiece 140 as shown in FIG. 4, and the sound generated from the diaphragm 121 passes to the eardrum. It shows the space to do. The earpiece 140 is formed of a resin or the like having flexibility and restoring property capable of covering a difference in a human ear canal.

  The speaker 129 is an electroacoustic transducer that converts an electric acoustic signal into a sound that can be heard by a person. In the case of the present embodiment, the speaker 129 includes a speaker main body 120 and a protection member 130.

  The speaker main body 120 is a small speaker that can be arranged inside the cylindrical insertion section 113. Although the size of the speaker main body 120 is not particularly limited, for example, in order to arrange the speaker main body 120 inside the insertion portion 113 having a size enough to be inserted into the human ear canal, a diameter of about 6 mm is used. That's it. In the case of the present embodiment, the speaker main body 120 is a device that generates a sound based on an audio signal from the circuit board 151, and as shown in FIG. 4, a diaphragm 121, a frame 123, a voice coil 124 , A magnetic circuit 125. In the earphone 100, the side from which the sound is emitted from the earphone 100 is defined as the front side, and the opposite direction is defined as the back side.

  The diaphragm 121 is a member that vibrates due to the vibration of the fixed voice coil 124 and converts an audio signal input to the voice coil 124 into sound. In the case of the present embodiment, diaphragm 121 has a shape in which the vicinity of the center when viewed from the front side swells toward the front side from the outer peripheral edge.

  A more flexible edge than the diaphragm 121 is attached to the outer periphery of the diaphragm 121. The edge allows the diaphragm 121 to vibrate, and when no signal is input to the voice coil 124, the edge keeps the diaphragm 121 neutral.

An outer peripheral ring is provided on the outer peripheral edge of the edge. By fixing the outer peripheral ring to the frame 123, the diaphragm 121 is supported by the frame 123 via the edge. In this specification, the term “diaphragm” refers to a portion inside the annular portion held by the housing. Therefore, in the case of the present embodiment, the frame 123 including the edge of the diaphragm 121 is a member serving as a structural basis of the speaker main body 120, and has a tubular shape. The frame 123 supports the diaphragm 121 at an end on the front side, and houses a voice coil 124 and a magnetic circuit 125 therein.

  The magnetic circuit 125 is a circuit that generates a steady magnetic flux in the magnetic gap, and is provided with a through-hole that is coaxial with the tube axis of the voice coil 124. The magnetic circuit 125 includes a plate 126, a magnet 127, and a yoke 128, as shown in FIG. In the present embodiment, the magnetic circuit 125 is of the external magnet type, but the magnetic circuit 125 may be of the internal magnet type.

  The plate 126 is a member made of a soft magnetic material having a circular plate shape and a through hole formed in the center. The plate 126 is fixed by an adhesive or the like with one surface thereof facing one end surface of the magnet 127.

  The magnet 127 is a permanent magnet having a circular ring shape and having a through hole formed in the center thereof, through which a part of the yoke 128 passes. The surface of the magnet 127 on the diaphragm 121 side is one of an N pole and an S pole, and the surface on the yoke 128 side is the other of the N pole and the S pole. A plate 126 is fixed to the surface of the magnet 127 on the diaphragm 121 side, and a yoke 128 is fixed to the back surface side. Specifically, the plate 126, the magnet 127, and the yoke 128 are fixed to each other with an adhesive. Note that the plate 126, the magnet 127, and the yoke 128 do not necessarily have to be fixed with an adhesive, but may be fixed with a fastening member such as a screw or a rivet.

  The yoke 128 is a member that forms a magnetic gap between the yoke 128 and the plate 126. The yoke 128 includes an annular bottom and a cylindrical center pole extending from the bottom to the plate 126 and communicating with the center hole of the bottom. ing. A magnetic gap is formed between the outer periphery of the center pole and the inner periphery of the plate 126.

  The voice coil 124 is a coil-shaped member formed by winding a metal wire in an annular (cylindrical) shape a plurality of times. Voice coil 124 has an input terminal to which an audio signal is input from circuit board 151. The voice coil 124 has one end inserted into the magnetic gap of the magnetic circuit 125 and the other end fixed to the diaphragm 121. Specifically, the voice coil 124 is fixed to a portion inside the outer peripheral edge of the diaphragm 121.

  The voice coil 124 may be wound around a bobbin, or may be fixed to the diaphragm 121 via the bobbin. Then, the diaphragm 121 vibrates according to the signal supplied to the voice coil 124, and sound is emitted from the diaphragm 121. Note that the sound emitted from the diaphragm 121 is guided to the eardrum via the sound path 139.

  The protection member 130 is an annular member that is disposed on the front side of the speaker body 120 and protects the diaphragm 121 of the speaker body 120. The through hole 131 provided at the center of the protection member 130 is a space through which the sound emitted from the diaphragm 121 of the speaker main body 120 passes through the sound path 139 formed by the earpiece 140 to the eardrum, and is a part of the sound path 139. Is formed. Further, inside the protection member 130, a resonance space 132 having an opening 133 opened at least at one position toward the sound path 139 is provided. In the present embodiment, the opening 133 opens toward the through hole 131. That is, the sound path 139 formed by the through-hole 131 and the resonance space 132 communicate with each other through the opening 133. With this configuration, the ratio between the opening area of the sound path 139 and the opening area of the through-hole 131 at the position of the opening 133 can be increased, so that a greater effect can be expected.

  The protection member 130 is attached to the front side of the frame 123 of the speaker main body 120 so as to sandwich the portion of the diaphragm 121 to which the outer peripheral ring is attached. The space between the protective member 130 and the diaphragm 121 also forms the sound path 139. That is, the sound path 139 is a space from the earpiece 140 to the eardrum, a space surrounded by the earpiece 140 on the front side of the protection member 130, a through hole 131 surrounded by the protection member 130, and a space between the protection member 130 and the diaphragm 121. Space. With this configuration, the opening 133 is not exposed to the front surface, and foreign matter is less likely to enter the resonance space 132 from the opening 133.

  FIG. 5 is an exploded perspective view of the protection member according to the present embodiment, as viewed from the back. FIG. 6 is a plan view showing the base part with the cover part of the protection member omitted. As shown in these figures, the protection member 130 of the present embodiment is provided so as to cover a base portion 134 having a groove forming the resonance space 132 and a groove provided in the base portion 134 and is provided on one surface. And a cover 135 in the form of a flat plate that is attached to the base 134 with the applied adhesive. And the protection member 130 is arrange | positioned with the base part 134 facing forward. That is, the groove of the base portion 134 is arranged facing the rear side, and as a result, the cover portion 135 is arranged to face the diaphragm 121.

  The resonance space 132 formed by the protection member 130 has a closed annular shape except for the opening 133 and is arranged so as to surround the through hole 131 forming the sound path. Further, in the case of the present embodiment, the resonance space 132 is in a state where the annular communication is blocked by the blocking wall 136. In addition, a protrusion 137 that protrudes from the opening 133 into the resonance space 132 is provided.

  The material forming the protection member 130 is not particularly limited, but in the case of the present embodiment, the protection member 130 is formed of resin. Further, by forming the base portion 134 separately from the cover portion 135, a groove for forming the resonance space 132 can be easily formed. Therefore, it is possible to easily create the shape of the resonance space 132 for realizing a desired Helmholtz resonance action.

  However, the resonance frequency of the resonance space 132 in the present embodiment is different from the resonance frequency calculated by a formula for calculating the resonance frequency of a general Helmholtz resonator. This is presumed to be due to the fact that the velocity of the air near the wall is limited by the viscosity of the air, causing a difference in the particle velocity of the air near the wall and near the center of the opening, and a pseudo reduction in the opening area. Is calculated by a correction formula for obtaining the resonance frequency of the resonance space 132 to be obtained.

  As described above, by arranging the protection member 130 having the resonance space 132 on the front surface of the speaker main body 120 disposed inside the insertion portion 113 inserted into the external auditory canal, utilizing the Helmholtz resonance effect. Thus, the peak sound pressure at an arbitrary resonance frequency can be attenuated. Therefore, generation of harsh sounds can be suppressed.

  Note that the present invention is not limited to the above embodiment. For example, another embodiment that is realized by arbitrarily combining the components described in this specification and excluding some of the components may be an embodiment of the present invention. In addition, the gist of the present invention with respect to the above-described embodiment, that is, modified examples obtained by performing various modifications conceivable by those skilled in the art without departing from the meaning indicated by the words described in the claims are also included in the present invention. It is.

  For example, as shown in FIG. 7, the protection member 130 may not include the blocking wall 136, and may form a resonance space 132 that communicates in a ring shape. In addition, the protrusion 133 may not be provided on the periphery of the opening 133. Further, the shape of the opening 133 is not limited to a rectangle.

  The position of the opening 133 provided in the protection member 130 is not limited to the position opening toward the through hole 191. For example, as shown in FIGS. 8 and 9, an opening 133 is formed in the cover 135 of the protection member 130, and the opening 133 opens toward the sound path 139 between the cover 135 and the diaphragm 121. It does not matter.

  As shown in FIGS. 10 and 11, an opening 133 is formed in the base portion 134 of the protection member 130 along the through hole 131, and the opening 133 is formed toward the sound path 139 and the ear canal formed by the earpiece 140. It may be open.

  As described above, by adjusting the position where the opening 133 is opened, it is possible to cope with a wider range of resonance frequencies in combination with the insertion portion 113 and the earpiece 140.

  Further, the resonance space 132 may have a spiral shape. This makes it possible to form a long (deep) resonance space 132 having a long (depth) length.

  Further, the protection member 130 may include a plurality of openings 133, and may include a plurality of resonance spaces 132 communicating with the respective openings 133.

  Further, the earphone 100 may be not only completely wireless, but also one in which the two speaker bodies 120 are connected by a wire, or one in which the speaker body 120 is connected to an output device that outputs an audio signal by a wire.

  In addition, although the speaker main body 120 including the frame 123 has been illustrated, the housing 110 may be used as a frame.

  Also. Although the protection member 130 has been described as being attached to the speaker body 120, the protection member 130 may be attached to the end of the insertion portion 113 of the housing 110, or the like.

  Further, the front surface of the protection member 130 is located at substantially the same position as the front end of the insertion portion 113, but the front end of the insertion portion 113 may protrude forward from the front surface of the protection member 130. In this case, the space on the front side of the protection member 130 and surrounded by the insertion portion 113 also forms the sound path 139. Alternatively, the front surface of the protection member 130 may protrude forward from the front end of the insertion portion 113.

  The form of the diaphragm 121 is not limited to the above. The diaphragm 121 may have, for example, a central portion that is recessed or flatter than an outer peripheral portion.

  Further, the cover 135 is not limited to the configuration in which the cover 135 is attached to the base portion 134 with an adhesive, but may be fixed with an adhesive.

  Further, the plate 126 and the yoke 128 are not limited to the configuration fixed to the magnet 127. The yoke 128 and the plate 126 may be housed and supported by the frame 123 while being attracted by the magnetic force of the magnet 127, for example.

  Further, the magnetic circuit of the speaker main body 120 is of the outer magnet type, but may be of the inner magnet type.

  INDUSTRIAL APPLICABILITY The present invention can be used for an earbud type earphone in which a speaker is arranged in an insertion section inserted into an ear canal.

REFERENCE SIGNS LIST 100 earphone 110 housing 111 housing main body 112 lid 113 insertion portion 114 flange 120 speaker main body 121 diaphragm 123 frame 124 voice coil 125 magnetic circuit 126 plate 127 magnet 128 yoke 130 protective member 131 through hole 132 resonance space 133 opening Portion 134 Base portion 135 Cover portion 136 Blocking wall 137 Projecting portion 140 Earpiece 151 Circuit board 152 Battery

Claims (9)

A speaker body having a diaphragm disposed inside a cylindrical insertion portion to be inserted into a human ear canal;
An annular protection member that is arranged on the front side of the diaphragm and forms a resonance space having an opening that opens toward a sound path through which sound emitted by the diaphragm passes, and protects the diaphragm,
An earphone speaker comprising: 2. The earphone speaker according to claim 1, wherein the resonance space formed by the protection member is a closed ring except for the opening, and is disposed so as to surround the sound path. 3. The earphone speaker according to claim 2, wherein the protection member has a blocking wall that blocks annular communication of the resonance space. The protection member includes a base portion having a groove that forms the resonance space, and a flat annular cover portion that is disposed so as to cover the groove and is attached to the base portion by an adhesive applied to one surface. An earphone speaker according to any one of claims 1 to 3. The protection member includes a through hole that forms the sound path, and the opening opens toward the through hole.
An earphone speaker according to any one of claims 1 to 4. The opening is open toward the sound path on the front side of the protection member,
An earphone speaker according to any one of claims 1 to 4. The opening was opened toward the sound path between the diaphragm and the protection member,
An earphone speaker according to any one of claims 1 to 4. A speaker according to any one of claims 1 to 7,
A housing having the insertion portion,
Earphone with. An earpiece attached to the insertion portion and having a sound path inside,
The earphone according to claim 8, comprising:

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