JP2011142502A - Compact loudspeaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact loudspeaker capable of eliminating the need for sealing between a diaphragm edge and the outer peripheral edge part of a baffle and preventing the water leakage of the compact loudspeaker itself that causes the infiltration of water into a portable electronic device. <P>SOLUTION: The diaphragm edge 12 whose cross section is L-shaped is formed at the outer peripheral edge part of a diaphragm 11, and the diaphragm edge 12 includes a flat part 12a and a rising part 12b rising from the outer peripheral edge of the flat part 12a. The flat part 12a is bonded and connected to the outer peripheral edge part 6a of a frame 6 and clamped between the outer peripheral edge part 6a of the frame 6 and the outer peripheral edge part 7c of the baffle 7 having a sound hole 8 for emitting sound and covering the diaphragm 11. The rising part 12b rises to a position higher than the outer peripheral edge part 7c of the baffle 7, leads water W which infiltrates between the flat part 12b and the outer peripheral edge part 7c of the baffle 7 only to the front surface side of the compact loudspeaker, and is sealed on the front surface side of the compact loudspeaker. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a small speaker used in a portable electronic device such as a cellular phone.

  A conventional small speaker will be described with reference to FIGS.

  FIG. 7 is a cross-sectional view of the left half of a conventional small speaker diaphragm. The diaphragm 1 shown in FIG. 7 is made of a thin film that does not allow air to pass through, for example, a resin film or the like, and vibrates the diaphragm 1 at the center of the back surface in order to generate sound by pushing the surrounding air by its own vibration. The upper end of the cylindrical voice coil 2 is adhesively bonded concentrically, and constitutes a vibration system 3 of a small speaker 4 to be described later with the voice coil 2, and the diaphragm 1 A flat diaphragm edge 1a is formed as a bonding margin for connecting 1 to a frame 6 of a small speaker 4 described later. The diaphragm edge 1a is on a horizontal plane (perpendicular to the cylinder axis of the voice coil 2).

  FIG. 8 is a cross-sectional view of the left half of a conventional small speaker, and FIG. 9 is an enlarged view of the main part of FIG. 8 and 9 includes the diaphragm 1 and the voice coil 2 shown in FIG. 7, that is, the vibration system 3, the magnetic circuit 5, the resin frame 6, and the metal plate baffle 7. Composed.

  The magnetic circuit 5 includes a bottomed cylindrical yoke 5a made of a magnetic material, a columnar magnet 5b made of a permanent magnet mounted and fixed on the center of the inner bottom surface of the yoke 5a, and an upper surface of the magnet 5b. A magnetic pole 5d is formed between the upper part of the peripheral side wall of the yoke 5a and the pole piece 5c.

  The frame 106 is formed integrally with the yoke 5a by insert molding or the like. The frame 106 is formed in a flange shape protruding outward from the upper peripheral side wall of the yoke 5a, and the magnetic circuit 5 is integrated at the center. The frame 6 is integrally formed with a flat outer peripheral edge 6a and a peripheral side wall 6b that rises perpendicularly from the outer peripheral edge of the outer peripheral edge 6a.

  The diaphragm 1 has a diaphragm edge 1a adhesively bonded to the outer peripheral edge 6a of the frame 6 by an adhesive, and is accommodated inside the peripheral side wall 6b of the frame 6, and the voice coil 2 is inserted and held in the magnetic gap 5d. Yes.

  The baffle 7 is formed in the shape of a low ceiling, and has a top plate portion 7a facing the frame 6, a peripheral side wall 7b extending downward from the outer peripheral edge of the top plate portion 7a, and a lower end of the peripheral side wall 7b. A flange-like flat outer peripheral edge portion 7c projecting outward is integrally formed. The baffle 7 is supported on the outer peripheral edge 6 a of the frame 6 by the outer peripheral edge 7 c of the baffle 7 and is fitted inside the peripheral side wall 6 b of the frame 6 to cover and protect the diaphragm 1.

  The diaphragm edge 1 is sandwiched between the outer peripheral edge 6 a of the frame 6 and the outer peripheral edge 7 c of the baffle 7.

  The top plate portion 7a of the baffle 7 on the front side of the diaphragm 1 is provided with a sound hole 8 for emitting sound to the front side of the small speaker 4, and the frame 6 on the back side of the diaphragm 1. Is provided with a back sound hole 9 for allowing air (sound) in the frame 6 shielded by the diaphragm 1 to escape to the back side of the small speaker 4.

  In this small speaker 4, an adhesive is applied to the outer peripheral edge 6 a of the frame 6 in which the magnetic circuit 5 is integrated, and the diaphragm edge 1 a of the diaphragm 1 to which the voice coil 2 is adhesively bonded is connected to the outer peripheral edge 6 a of the frame 6. After forming a speaker body in which the magnetic circuit 5 and the vibration system 3 are supported by the frame 6, a baffle 7 is fitted inside the peripheral side wall 6 b of the frame 6, and the diaphragm 1 is covered by the baffle 7. Assembled.

  Such a small speaker 4 is installed inside a sound hole provided in the casing of the mobile phone, for example, as a speaker for generating a ringtone of the mobile phone, and is mounted on a substrate accommodated in the casing of the mobile phone. A pair of external connection terminals integrally provided on the back side of the frame 6 from the constructed electronic circuit, and two voice coil lead wires that electrically connect the pair of external connection terminals and both ends of the winding of the voice coil 2 A current is passed through the voice coil 2 through the terminal.

  Thereby, the small speaker 4 reciprocates the voice coil 2 up and down by the interaction (Fleming's law) between the magnetic flux flowing in the magnetic gap 5d and the current flowing in the voice coil 2, and accordingly the diaphragm 1 Vibrates up and down, and a ring tone is emitted from the sound hole 8 on the front side of the small speaker 4 to the outside of the mobile phone through the sound hole provided in the casing of the mobile phone.

  By the way, when the mobile phone gets wet with rain or the like, water W enters the small speaker 4 from the sound hole provided in the casing of the mobile phone through the sound hole 8 on the front side of the small speaker 4.

  Thus, the water W that has entered the small speaker 4 is received on the surface of the diaphragm 1 because the diaphragm 1 does not have air permeability as shown by the arrows in FIGS. Along the surface of the plate 1, it reaches the outer peripheral edge of the diaphragm 1 and enters between the diaphragm edge 1 a and the outer peripheral edge 7 c of the baffle 7, and from there the peripheral side wall 6 b of the frame 6 and the outer peripheral edge of the baffle 7. It leaks to the front side of the small speaker 4 through the space between the portions 7c, and also leaks from the diaphragm edge 1a and the outer peripheral edge 6a of the frame 6 to the back side of the small speaker 4 through the back sound hole 9. . As a result, water W may enter the mobile phone and adversely affect electronic components in the mobile phone.

  Such a water leak of the small speaker 4 that causes the water W to enter the mobile phone is caused by the following.

  In the small speaker 4, when the diaphragm edge 1 a is adhesively bonded to the outer peripheral edge 6 a of the frame 6 using an adhesive, the diaphragm 1 is wrinkled, or the adhesive is applied to a place other than the diaphragm edge 1 a. If it adheres, the acoustic performance of the small speaker 4 will be reduced, or the acoustic performance of each small speaker 4 will vary, so the application position and amount of adhesive will be strictly controlled, and the adhesive will be uniform with high positional accuracy. Must be applied to. When the number of such adhesive bonding locations increases, the assembly productivity of the small speaker 4 decreases, so the diaphragm edge 1a is adhesively bonded to the outer peripheral edge 6a of the frame 6, and the diaphragm edge 1a. The outer peripheral edge 6a of the frame 6 is sealed with an adhesive, but is not adhesively bonded to the outer peripheral edge 7c of the baffle 7, and the diaphragm edge 1a and the outer peripheral edge 7c of the baffle 7 are not bonded. Is not sealed with an adhesive, and due to the demand for further miniaturization of the small speaker 4, the overlap margin (adhesion) between the diaphragm edge 1 a and the outer peripheral edge portion 7 c of the baffle 7 can be sufficiently secured. Furthermore, since it has become impossible to secure a sufficient bonding allowance between the diaphragm edge 1a and the outer peripheral edge 6a of the frame 6 at the same time, even if the gap between them is adhesively bonded using an adhesive, adhesion spots Etc. It lies in the fact that the seal is broken in.

  In order to solve such a problem, in the speaker device described in Patent Document 1, the peripheral edge (diaphragm edge 1a) of the diaphragm and the peripheral edge (outer peripheral edge 7c) of the protector (baffle 7) are bonded with an adhesive or the like. Adhesive bonding with double-sided tape, or an O-ring is provided between the peripheral edge of the diaphragm and the peripheral edge of the protector, and an adhesive, double-sided tape, or O-ring is provided between the peripheral edge of the diaphragm and the peripheral edge of the protector. By sealing with the speaker, water leakage of the speaker itself was prevented.

JP 2008-278146 A

  However, like the speaker device described in Patent Document 1, in the small speaker 4, when the gap between the diaphragm edge 1a and the outer peripheral edge portion 7c of the baffle 7 is sealed using an adhesive, a double-sided tape, or an O-ring, This causes a problem that assembly productivity of the small speaker 4 is lowered.

  Therefore, there is no need for a seal between the diaphragm edge 1a and the outer peripheral edge 7c of the baffle 7, and a small speaker that can prevent water leakage of the small speaker 4 itself that causes water W to enter the mobile phone. It is desired.

  Accordingly, the present invention has been made in view of the above-described problems, and eliminates the need for a seal between the diaphragm edge and the outer peripheral edge of the baffle, and makes it small in size that causes water to enter the portable electronic device. An object of the present invention is to provide a small speaker capable of preventing water leakage of the speaker itself.

  In order to achieve the above object, according to the present invention, a diaphragm edge having an L-shaped cross section is formed on the outer peripheral edge of a diaphragm having a voice coil bonded and bonded at the center, and a flat portion and an outer portion of the flat portion are formed on the diaphragm edge. A rising portion rising from a peripheral edge, and the flat portion is adhesively bonded to an outer peripheral edge portion of a frame in which a magnetic circuit is integrated at a central portion, and an outer peripheral edge portion of the frame and a sound hole for emitting sound are provided. Water that is sandwiched between the outer peripheral edge of the baffle that covers the diaphragm, the rising part rises to a position higher than the outer peripheral edge of the baffle, and has entered between the flat part and the outer peripheral edge of the baffle. Is guided only to the front side of the small speaker.

  In the present invention, it is preferable that an adhesive layered on the outer peripheral edge of the baffle is used to close the space between the rising part and the outer peripheral edge of the baffle on the front side of the small speaker. Furthermore, it is preferable that the adhesive is piled up to a height that wraps around the upper portion of the rising portion at a position higher than the outer peripheral edge of the baffle.

  According to the present invention, since sealing (leakage prevention) that can only be performed between the diaphragm edge (flat portion) and the outer peripheral edge of the baffle can be performed on the front side of the small speaker, Such a seal between the diaphragm edge (flat portion) and the outer peripheral edge of the baffle becomes unnecessary. On the front side of the small speaker, unlike the conventional seal between the diaphragm edge (flat portion) and the outer peripheral edge of the baffle, the small speaker does not affect the acoustic performance of the small speaker. Sealing can be performed easily and reliably without being influenced by downsizing of the device. As a result, there is provided a small speaker that eliminates the need for a seal between the diaphragm edge and the outer peripheral edge of the baffle and prevents water leakage of the small speaker itself that causes water to enter the portable electronic device. be able to.

  In addition, the seal on the front side of the small speaker can be ensured by using an adhesive that accumulates on the outer peripheral edge of the baffle and closing the gap between the flat part and the outer peripheral edge of the baffle on the front side of the small speaker. It is possible to prevent the water leakage of the small speaker itself. Furthermore, the adhesive can prevent water leakage of the small speaker itself more reliably by increasing the height so as to wrap up the upper portion of the flat portion located higher than the outer peripheral edge portion of the baffle.

It is sectional drawing of the left half part of the diaphragm for small speakers which shows Example 1 of this invention. It is sectional drawing of the left half part of the small speaker which shows Example 1 of this invention. FIG. 3 is an enlarged view of a main part of FIG. 2. It is sectional drawing of the left half part of the diaphragm for small speakers which shows Example 2 of this invention. It is sectional drawing of the left half part of the small speaker which shows Example 2 of this invention. It is a principal part enlarged view of FIG. It is sectional drawing of the left half part of the conventional diaphragm for small speakers. It is sectional drawing of the left half part of the conventional small speaker. It is a principal part enlarged view of FIG.

  Hereinafter, a small speaker of the present invention will be described with reference to an embodiment and drawings. In addition, the same code | symbol is attached | subjected to the same structure part as the conventional small speaker shown in FIGS. 7-9, and description is abbreviate | omitted.

  Example 1 which is one embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a cross-sectional view of the left half of the speaker diaphragm showing Embodiment 1 of the present invention. The diaphragm 11 shown in FIG. 1 is made of a thin film that does not allow air to pass through, for example, a resin film, and vibrates the diaphragm at the center of the back surface. The upper end of the voice coil 2 is concentrically adhesively bonded, and this voice coil 2 constitutes a vibration system 13 of a small speaker 14 to be described later. The outer peripheral edge of the diaphragm 11 has an L-shaped cross section. The diaphragm edge 12 is formed. The diaphragm edge 12 is provided with a flat portion 12a and a rising portion 12b rising from the outer peripheral edge of the flat portion 12a. The flat portion 12 a is on a horizontal plane (perpendicular to the cylinder axis of the voice coil 2), and the rising portion 12 b is on a cylindrical surface concentric with the voice coil 2. The rising portion 12b rises to a position higher than the outer peripheral edge portion 7c of the baffle 7 within a range not exceeding a peripheral side wall 6b of the frame 6 of the small speaker 14 described later.

  FIG. 2 is a cross-sectional view of the left half portion of the small speaker showing Embodiment 1 of the present invention, and FIG. 3 is an enlarged view of the main part of FIG. The small speaker 14 shown in FIGS. 2 and 3 includes the diaphragm 11 and the voice coil 2, that is, the vibration system 13 shown in FIG. 1.

  In the diaphragm 11, the flat portion 12 a of the diaphragm edge 12 is adhesively bonded to the outer peripheral edge portion 6 a of the frame 6 with an adhesive, and the surface of the outer peripheral edge portion 6 a of the frame 6 and the back surface of the outer peripheral edge portion 7 c of the baffle 7. A flat portion 12a of the diaphragm edge 12 is sandwiched therebetween, and a lower portion of the rising portion 12b of the diaphragm edge 12 is interposed between the inner peripheral surface of the peripheral side wall 6b of the frame 6 and the outer peripheral surface of the outer peripheral edge portion 7c of the baffle 7. Is sandwiched between the inner peripheral surface of the peripheral side wall 6 b of the frame 6 and the outer peripheral surface of the outer peripheral edge portion 7 c of the baffle 7 and into the gap 15 between the peripheral side wall 6 b of the frame 6 and the peripheral side wall 7 b of the baffle 7. The rising portion 12b is housed inside the peripheral side wall 6b of the frame 6 with the upper portion protruding.

  In this small speaker 14, an adhesive is applied to the outer peripheral edge 6 a of the frame 6 in which the magnetic circuit 5 is integrated, and the flat portion 12 a of the diaphragm edge 12 of the diaphragm 11 to which the voice coil 2 is adhesively bonded is connected to the frame 6. A speaker main body in which the magnetic circuit 5 and the vibration system 13 are supported by the frame 6 is formed by adhesively bonding to the outer peripheral edge portion 6a. A baffle 7 is fitted inside the peripheral side wall 6b of the frame 6, and the diaphragm 11 is attached to the baffle 7. After being covered by the adhesive, a waterproof adhesive (on the outer peripheral edge portion 7c of the baffle 7 from the gap 15 between the peripheral side wall 6b of the frame 6 and the peripheral side wall 7b of the baffle 7 which is open on the front side of the small speaker 14 is provided. For example, a rubber-based adhesive) 16 is filled, and on the front side of the small speaker 14, the gap between the rising portion 12 b of the diaphragm edge 12 and the outer peripheral edge portion 7 c of the baffle 7 is closed and sealed ( Further, the adhesive 16 is filled up to a height that wraps the upper part of the rising part 12b of the diaphragm edge 12 at a position higher than the outer peripheral edge part 7a of the baffle 7, and the rising part of the diaphragm edge 12 is filled. 12b and the peripheral side wall 6b of the frame 6 are simultaneously closed and sealed (leakage prevention) for assembly.

  Such a small speaker 14 is installed inside a sound hole provided in the casing of the mobile phone, for example, as a speaker that generates a ringtone of the mobile phone, and is mounted on a substrate accommodated in the casing of the mobile phone. A pair of external connection terminals integrally provided on the back side of the frame 6 from the constructed electronic circuit, and two voice coil lead wires that electrically connect the pair of external connection terminals and both ends of the winding of the voice coil 2 A current is passed through the voice coil 2 through the terminal.

  As a result, the small speaker 14 reciprocates up and down due to the interaction between the magnetic flux flowing in the magnetic gap 5d and the current flowing in the voice coil 2 (Fleming's law). Vibrates up and down, and a ring tone is emitted from the sound hole 8 on the front side of the small speaker 14 to the outside of the mobile phone through the sound hole provided in the casing of the mobile phone.

  By the way, when the mobile phone gets wet with rain or the like, water W enters the small speaker 14 from the sound hole provided in the casing of the mobile phone through the sound hole 8 on the front side of the small speaker 14.

  Thus, the water W that has entered the small speaker 14 is received on the surface of the diaphragm 11 because the diaphragm 11 does not have air permeability as shown by the arrows in FIG. 2 and FIG. Along the surface of the plate 11, it reaches the outer peripheral edge of the diaphragm 11 and enters between the flat portion 12 a of the diaphragm edge 12 and the outer peripheral edge 7 c of the baffle 7.

  Conventionally, since only the flat diaphragm edge 1a corresponding to the flat portion 12a of the diaphragm edge 12 of the present embodiment is provided, the water W between the diaphragm edge 1a and the outer peripheral edge portion 7c of the baffle 7 is provided. Leaks to the front side of the small speaker 4 through the space between the peripheral side wall 6b of the frame 6 and the outer peripheral edge 7c of the baffle 7, and further between the diaphragm edge 1a and the outer peripheral edge 6a of the frame 6. Leaks to the back side of the small speaker 4 through the back sound hole 9, and as a result, water W may enter the mobile phone and adversely affect electronic components in the mobile phone.

  However, in this embodiment, the diaphragm edge 12 is formed in an L-shaped cross section, and the rising portion 12b rising from the outer edge of the flat portion 12a of the diaphragm edge 12 is provided, so that the flat portion 12a of the diaphragm edge 12 is provided. Even if water W permeates between the outer peripheral edge portion 7c of the baffle 7 and the rising edge 12b of the diaphragm edge 12 receives the water W, the rising edge 12b of the diaphragm edge 12 and the outside of the baffle 7 The small speaker 14 is guided only to the front side of the small speaker 14 between the peripheral edge portion 7c, and between the flat portion 12a of the diaphragm edge 12 and the outer peripheral edge portion 6a of the frame 6, and further through the back sound hole 9, the back surface of the small speaker 14. The seal (leakage prevention) that can only be performed between the diaphragm edge 1a and the outer peripheral edge portion 7c of the baffle 7 can be performed on the front side of the small speaker 14. Since the seal between the outer peripheral edge portion of the diaphragm edge 1a and the baffle 7 as in the prior art is not required.

  Therefore, in this embodiment, on the front side of the small speaker 14, the adhesive 16 accumulated on the outer peripheral edge 7 c of the baffle 7 is placed between the rising edge 12 b of the diaphragm edge 12 and the outer peripheral edge 7 c of the baffle 7. Since the water W that has entered between the flat portion 12 a of the diaphragm edge 12 and the outer peripheral edge portion 7 c of the baffle 7 is prevented from leaking to the front side of the small speaker 14. be able to.

  Further, on the front side of the small speaker 14, the rising portion 12 b of the diaphragm edge 12 is formed by the adhesive 16 that is stacked to a height that wraps the upper portion of the rising portion 12 b of the diaphragm edge 12 that is higher than the outer peripheral edge portion 7 a of the baffle 7. And the peripheral side wall 6b of the frame 6 are simultaneously closed and sealed (leak prevention), so that the water W that has entered between the flat portion 12a of the diaphragm edge 12 and the outer peripheral edge portion 7c of the baffle 7 is small. It is possible to prevent leakage to the front side of the speaker 14 and leakage from there to the back side of the small speaker 14 via the rising portion 12b of the diaphragm edge 12 and the peripheral side wall 6b of the frame 6.

  Unlike the conventional seal between the diaphragm edge 1a and the outer peripheral edge 7c of the baffle 7, on the front side of the small speaker 14, the small speaker 14 is not affected without affecting the acoustic performance of the small speaker 14. Without being influenced by the downsizing of the speaker, the gap 15 between the peripheral side wall 6b of the frame 6 and the peripheral side wall 7b of the baffle 7 opened on the front side of the small speaker 14 is placed on the outer peripheral edge 7c of the baffle 7. Just by filling the adhesive 16, between the rising portion 12b of the diaphragm edge 12 and the outer peripheral edge portion 7c of the baffle 7, and between the rising portion 12b of the diaphragm edge 12 and the peripheral side wall 6b of the frame 6, Each can be closed and reliably sealed.

  As a result, in this embodiment, the seal between the flat portion 12a of the diaphragm edge 12 and the outer peripheral edge portion 7c of the baffle 7 is not required, and the small speaker 14 itself that causes water intrusion into the portable electronic device is eliminated. A small speaker 14 that can reliably prevent water leakage is realized.

  Next, Example 2 which is one embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same structure part as the small speaker 14 of Example 1 shown in FIGS. 1-3, and description is abbreviate | omitted.

  FIG. 4 is a cross-sectional view of the left half of the small speaker diaphragm showing the second embodiment of the present invention. The diaphragm 21 shown in FIG. 4 has the same structure as the diaphragm 11 shown in FIG. 1 except that a resin diaphragm ring 22 is provided on the back surface of the flat portion 12a of the diaphragm edge 12. . The diaphragm ring 22 is adhesively bonded to the back surface of the flat portion 12a of the diaphragm edge 12 using an adhesive.

  FIG. 5 is a cross-sectional view of the left half portion of the small speaker showing Embodiment 2 of the present invention, and FIG. 6 is an enlarged view of the main part of FIG. The small speaker 24 shown in FIGS. 5 and 6 includes the diaphragm 21 and the voice coil 2 shown in FIG. 4, that is, the vibration system 23, and the diaphragm 24 is flat on the outer peripheral edge 6 a of the frame 6. Except that the portion 12a is bonded and bonded by an adhesive via the diaphragm ring 22, it has the same structure as the small speaker 14 shown in FIGS. 2 and 3, and the small speaker 14 shown in FIGS. Have the same function.

  In this embodiment, since the diaphragm 21 is provided with the diaphragm ring 22, the flat portion 12 a of the diaphragm edge 12 is bonded to the outer peripheral edge portion 6 a of the frame 6 using an adhesive when the small speaker 24 is assembled. The coupling can be easily performed, and the assembly productivity can be increased as compared with the small speaker 14 shown in FIGS.

  As mentioned above, although Example 1 and 2 showed one embodiment of this invention, this invention is not limited to it, Various modifications can be implemented within the range which does not deviate from the summary. For example, the diaphragm has a one-piece structure, but after the central part and the peripheral part formed integrally with the diaphragm edge are separately formed, these are bonded and integrated using an adhesive. Other than the one-piece structure, such as a two-piece structure, or a three-piece structure in which the central part, the peripheral part, and the diaphragm edge are separately formed and then bonded together using an adhesive Good. The frame is made of a resin that is separate from the yoke, but it may be of a yoke-integrated type made of a magnetic material and integrally formed with the yoke.

2 Voice coil 5 Magnetic circuit 6 Frame 6a Outer peripheral edge 7 Baffle 7c Outer peripheral edge 8 Sound hole 11, 21 Speaker diaphragm 14, 24 Small speaker 12 Diaphragm edge 12a Flat part 12b Rising part 16 Adhesive (seal)
W Water

Claims (3)

  A diaphragm edge having an L-shaped cross section is formed on the outer peripheral edge of the diaphragm having a voice coil bonded and bonded to the center, and a flat part and a rising part rising from the outer peripheral edge of the flat part are provided on the diaphragm edge, The flat portion is adhesively bonded to the outer peripheral edge of a frame in which a magnetic circuit is integrated at the center, and the outer peripheral edge of the baffle that covers the diaphragm by providing a sound hole that emits sound and a sound hole. The rising portion rises to a position higher than the outer peripheral edge portion of the baffle and guides water that has entered between the flat portion and the outer peripheral edge portion of the baffle only to the front side of the small speaker. A small speaker characterized by   The small speaker according to claim 1, wherein an adhesive layered on an outer peripheral edge portion of the baffle is used to close a space between the rising portion and the outer peripheral edge portion of the baffle on the front side of the small speaker.   The small speaker according to claim 2, wherein the adhesive is piled up to a height that wraps around an upper portion of the rising portion at a position higher than an outer peripheral edge portion of the baffle.

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