JP6375233B2 - Speaker - Google Patents

Description

  The present invention relates to a speaker.

  Conventionally, a speaker applied to a portable electronic device such as a cellular phone is known (for example, see Patent Document 1). This type of speaker requires waterproofing for application to a portable electronic device, and includes a magnetic circuit, a diaphragm, a voice coil, a baffle, a frame, and a sheet-like adhesive. I have.

  The diaphragm is disposed on one side of the magnetic circuit. The voice coil is disposed in a magnetic gap of the magnetic circuit and is coupled to the diaphragm. The baffle has a sound hole that emits sound, and is disposed on the opposite side of the magnetic circuit with respect to the diaphragm so as to cover the diaphragm.

  The frame has an annular shape and is configured to hold the magnetic circuit, the diaphragm, and the baffle. The sheet-like adhesive is a double-sided tape, and is provided between the two along the outer peripheral edge portion in order to adhesively bond the outer peripheral edge portion of the baffle to the outer peripheral edge portion of the diaphragm. .

  In such a speaker, the outer peripheral edge of the baffle tends to be pressed against the sheet-like adhesive with an excessive force so as to be adhesively bonded to the outer peripheral edge of the diaphragm. In addition, the speaker may be held or used for a long time in a high temperature atmosphere in a state where the speaker is applied to a portable electronic device.

  When such a situation occurs, deformation of the sheet-like adhesive such as wrinkles, deflection, and / or misalignment occurs due to the pressing load by the baffle and / or thermal expansion due to high temperature, and the mutual adhesion occurs. There may be a slight gap between the outer peripheral edge of the baffle to be coupled and the outer peripheral edge of the diaphragm.

  Therefore, when water enters through the sound hole into the space formed between the baffle and the diaphragm, the outer peripheral edges of which are bonded to each other, the water enters the further interior of the speaker. May be allowed through the slight gap. That is, the waterproofness of the speaker may be impaired.

  In addition, when the sheet-like adhesive is deformed, such as wrinkles, bending, or / and misaligned, the sheet-like adhesive is interposed between the baffle and the diaphragm so that the sheet-like adhesive interferes with the diaphragm. There is also the possibility of protruding into the formed space. In this case, the acoustic performance of the speaker may be degraded.

JP 2008-278146 A

  The present invention has been made in view of such circumstances, and in a speaker in which an outer peripheral edge of a diaphragm and an outer peripheral edge of a baffle are bonded and bonded using a sheet-like adhesive, It is an object of the present invention to provide a speaker capable of suppressing deterioration of acoustic performance and waterproof performance due to deformation of a sheet-like adhesive during adhesive bonding.

A speaker according to one embodiment of the present invention includes:
A magnetic circuit;
A diaphragm disposed on one side of the magnetic circuit;
A voice coil disposed in the magnetic gap of the magnetic circuit and coupled to the diaphragm;
A baffle having a sound hole for emitting sound and disposed on the opposite side of the magnetic circuit with respect to the diaphragm so as to cover the diaphragm;
A frame for holding the magnetic circuit, the diaphragm and the baffle;
In order to adhesively bond the outer peripheral edge of the diaphragm and the outer peripheral edge of the baffle, a speaker comprising a sheet-like adhesive disposed between these outer peripheral edges,
The outer peripheral edge of the diaphragm is
A flat first adhesive surface that can be bonded to the sheet-like adhesive;
The outer peripheral edge of the baffle is
A second adhesive surface capable of adhering to the sheet-like adhesive;
After the sheet adhesive is bonded to the first adhesive surface, a part of the sheet adhesive is directed toward the first adhesive surface while the second adhesive surface is bonded to the sheet adhesive. And a boss portion protruding from the second adhesive surface so that the pressed state can be maintained.

  According to this configuration, in order to adhesively bond the outer peripheral edge portion of the baffle to the outer peripheral edge portion of the diaphragm, the sheet-like adhesive is first pressed by the boss portion, and then the pressed state is maintained. The second adhesive surface can be pressed against the sheet-like adhesive to be bonded. Therefore, at the time of this adhesive bonding, it is possible to prevent the sheet-like adhesive from being excessively deformed (bent or the like) or / and displaced so as to interfere with the diaphragm by being pressed by the second adhesion.

  When the outer peripheral edge of the baffle is coupled to the outer peripheral edge of the diaphragm, water that has entered the space between the baffle and the diaphragm enters the further interior of the speaker through the sound hole of the baffle. In order to prevent this, it is possible to sufficiently secure a close contact portion between the sheet-like adhesive and each of the first adhesive surface and the second adhesive surface facing the space. Therefore, it is possible to suppress a decrease in acoustic performance and waterproof performance of the speaker due to deformation and displacement of the sheet adhesive.

According to another aspect of the invention,
The boss portions are arranged at predetermined intervals in the circumferential direction of the outer peripheral edge portion of the baffle.

  According to the present invention, in a speaker in which the outer peripheral edge of the diaphragm and the outer peripheral edge of the baffle are bonded and bonded using a sheet-like adhesive, the deformation of the sheet-like adhesive at the time of adhesive bonding of these outer peripheral edges is reduced. The speaker which can suppress the fall of the acoustic performance and waterproof performance which originates can be provided.

It is sectional drawing which shows schematically the speaker which concerns on one Embodiment of this invention. FIG. 2 is a partially enlarged view of FIG. 1. It is sectional drawing which shows schematically the speaker which concerns on another embodiment of this invention. It is a top view of the speaker of FIG. It is a downward perspective view of the baffle in the speaker of FIG. It is sectional drawing which shows schematically a mode that the outer periphery part of the baffle in the speaker of FIG. 1 is adhesive-bonded to the outer periphery part of a diaphragm. It is sectional drawing which shows roughly the partial structure which concerns on the modification of the speaker of FIG.

  First, a schematic configuration of one embodiment of the present invention will be described.

  FIG. 1 is a cross-sectional view schematically showing a speaker 1 according to an embodiment of the present invention. FIG. 2 is a partially enlarged view of FIG. In FIG. 1, the direction of arrow X is the vertical direction of the speaker 1, and the direction of arrow Y is the horizontal direction of the speaker 1.

  The speaker 1 can be applied to a portable electronic device such as a cellular phone. The speaker 1 requires a waterproof measure for application to a portable electronic device. As shown in FIG. 1, a magnetic circuit 2, a diaphragm 3, a voice coil 4, a baffle 5, The frame 6 and the sheet-like adhesive 7 are provided.

  In this embodiment, the magnetic circuit 2 includes a bottomed cylindrical yoke 11 made of a magnetic material, a columnar magnet 12 made of a permanent magnet, and a plate-shaped pole piece 13 made of a magnetic material. . The magnet 12 is disposed in the radial direction in the yoke 11 and is fixed to the bottom surface of the yoke 11.

  The pole piece 13 is disposed in the yoke 11 and is fixed to the upper surface of the magnet 12 so as to cover the magnet 12. A magnetic gap 15 is formed between the pole piece 13 and the peripheral side wall portion 14 of the yoke 11 so as to have a predetermined interval in a direction orthogonal to the axial support direction of the yoke 11.

  The diaphragm 3 is disposed on one side (above) of the magnetic circuit 2. The diaphragm 3 is made of a thin film that does not allow air to pass therethrough, for example, a thin film made of synthetic resin, and is configured so that the surrounding air can be pushed and vibrated by the vibration of the diaphragm 3 to emit sound. .

  The diaphragm 3 has a central portion 17 and an outer peripheral portion 18 formed so as to surround the central portion 17. A flat outer peripheral edge portion 20 is provided on the peripheral edge of the outer peripheral portion 18. As shown in FIG. 2, the outer peripheral edge portion 20 includes a flat first bonding surface (upper surface) 21.

  The voice coil 4 is disposed in the magnetic gap 15 of the magnetic circuit 2 and is coupled to the diaphragm 3. In the present embodiment, the voice coil 4 is formed in a cylindrical shape extending along the pole piece 13 and the peripheral side wall portion 14 of the yoke 11.

  The baffle 5 has a sound hole 24 for emitting sound, and is disposed on the opposite side of the magnetic circuit 2 with respect to the diaphragm 3 so as to cover the diaphragm 3. In the present embodiment, the baffle 5 is disposed above the diaphragm 3 so that a space 25 is formed between the baffle 5 and the diaphragm 3.

  The baffle 5 includes a baffle body 27 and an annular projecting portion 28 projecting from the periphery of the baffle body 27 to the other (downward). An outer peripheral edge 30 is provided on the protruding end side of the protruding portion 28. As shown in FIG. 2, the outer peripheral edge portion 30 includes a second bonding surface (lower surface) 31.

  The frame 6 is configured to hold the magnetic circuit 2, the diaphragm 3 and the baffle 5. In the present embodiment, the frame 6 includes an annular frame body 33 that surrounds the magnetic circuit 2, and an annular peripheral side wall 34 that protrudes from the periphery of the frame body 33 to one side (upward). Yes.

  A support portion 35 is provided on the frame main body 33 on the inner peripheral side of the peripheral side wall portion 34. The frame 6 supports the outer peripheral edge portion 20 of the diaphragm 3 by the support portion 35 while positioning the diaphragm 3 and the baffle 5 disposed inside by the peripheral side wall portion 34. It can be done.

  In the present embodiment, the support portion 35 includes a metallic ring body 36 that can support the outer peripheral edge portion 20 of the diaphragm 3. The ring body 36 is formed in an annular shape along the inner periphery of the frame body 33 and the outer peripheral edge portion 20 of the diaphragm 3 positioned by the peripheral side wall portion 34.

  The ring body 36 is adhesively bonded to the frame body 33 on the lower surface thereof using an adhesive (for example, a modified silicone adhesive). The ring body 36 is adhesively bonded to the outer peripheral edge portion 20 of the diaphragm 3 on the upper surface thereof using an adhesive (for example, a polyester-based adhesive).

  In order to reduce the external dimensions of the speaker, instead of the frame 6, for example, as shown in FIGS. 3 and 4, a rectangular annular frame main body 33A corresponding to the external dimensions of the baffle 5, and the vibration It is also possible to employ a frame 6A including a peripheral side wall portion (receiving portion) 34A that protrudes only at four corners of the frame body 33A so as to support the plate 3 and the baffle 5.

  The sheet adhesive 7 is provided between the outer peripheral edge 20 of the diaphragm 3 and the outer peripheral edge 30 of the baffle 5 in order to adhesively bond them. In the present embodiment, the sheet-like adhesive 7 is made of a double-sided tape, and is formed in an annular shape along the outer peripheral edge 20 of the diaphragm 3 and the outer peripheral edge 30 of the baffle 5.

  The sheet adhesive 7 is bonded to the second bonding surface 31 on the baffle 5 side on one flat surface (upper surface), and the first surface on the diaphragm 3 side on the other flat surface (lower surface). The outer peripheral edge 20 of the diaphragm 3 and the outer peripheral edge 30 of the baffle 5 are adhesively bonded to each other by being bonded to the adhesive surface 21.

  As the sheet-like adhesive 7, for example, a conventional general double-sided tape having an acrylic adhesive material on both sides can be employed.

  And when the said speaker 1 is provided with the above-mentioned each part and is applied to a portable electronic device, it operates the said voice coil 4 so that the said diaphragm 3 may vibrate by the audio | voice signal given from the outside, Sound can be emitted from the diaphragm 3.

  Next, adhesive bonding between the outer peripheral edge 20 of the diaphragm 3 and the outer peripheral edge 30 of the baffle 5 will be described in more detail.

  FIG. 5 is a lower perspective view of the baffle 5. FIG. 6 is a cross-sectional view schematically showing how the outer peripheral edge 30 of the baffle 5 is adhesively bonded to the outer peripheral edge 20 of the diaphragm 3.

  As shown in FIGS. 2, 5, and 6, in the speaker 1, the outer peripheral edge 20 of the diaphragm 3 has a flat first adhesive surface 21 that can be bonded to the sheet-like adhesive 7. ing. In the present embodiment, the first adhesive surface 21 is bonded to the other flat surface of the sheet-like adhesive 7 while placing the sheet-like adhesive 7 thereon.

  The outer peripheral edge 30 of the baffle 5 has a second adhesive surface 31 that can be bonded to the sheet adhesive 7. The outer peripheral edge portion 30 of the baffle 5 further has a boss portion (projection) 41. In the present embodiment, the second adhesive surface 31 is formed so as to face the first adhesive surface 21 on the diaphragm 3 side.

  The second adhesive surface 31 is a flat surface that can be arranged substantially in parallel with the first adhesive surface 21. The second adhesive surface 31 is placed on the sheet adhesive 7 with the sheet adhesive 7 sandwiched between the first adhesive surface 21 and one of the sheet adhesives 7. It is glued to the flat surface.

  In addition, the boss 41 is bonded to the sheet adhesive while the second adhesive surface 31 is adhered to the sheet adhesive 7 after the sheet adhesive 7 is adhered to the first adhesive surface 21. It protrudes from the second adhesive surface 31 so that a state where a part of the agent 7 is pressed toward the first adhesive surface 21 can be maintained.

  In the present embodiment, a plurality (specifically, 14) of the boss portions 41 are provided, and the boss portions 41 are provided at predetermined intervals in the circumferential direction of the outer peripheral edge portion 30 (the second adhesive surface 31) of the baffle 5. (Intermittently). Specifically, the boss portions 41 are arranged adjacent to each other in the circumferential direction of the second adhesive surface 31 at substantially equal intervals.

  The boss 41 is further related to the radial direction of the outer peripheral edge 20 of the diaphragm 3 (the direction perpendicular to the vertical direction of the speaker 1 including the direction including the left-right direction of the speaker 1). With respect to the circumferential direction of 20, it is arranged so as to be in contact with the middle part of the first adhesive surface 21 on the diaphragm 3 side.

  That is, the boss 41 is formed around the boss 41 that presses the first bonding surface 21 when the outer peripheral edge 20 of the diaphragm 3 and the outer peripheral edge 30 of the baffle 5 are bonded. It arrange | positions in the middle part of the said 2nd adhesive surface 31 so that the contact | adherence part of the 2nd adhesive surface 31 and the said sheet-like adhesive 7 may be formed.

  In the present embodiment, the boss portion 41 is formed in a columnar shape that can protrude downward from the second adhesive surface 31 toward the outer peripheral edge portion 20 of the diaphragm 3. The shape of the boss portion 41 is not limited to the above-described columnar shape, and may be, for example, a conical or hemispherical shape that can be convex with the outer peripheral edge portion 20 side.

  The protruding width of the boss portion 41 is appropriately set so that the second adhesive surface 31 can be bonded to the sheet adhesive 7 together with the boss portion 41. The interval between the boss portions 41 adjacent to each other on the second adhesive surface 31 is appropriately set so that a close contact portion between the second adhesive surface 31 and the sheet adhesive 7 can be sufficiently secured between them. The

  In the present embodiment, the position of the outer peripheral surface of the sheet adhesive 7 is defined when the outer peripheral edge 20 of the diaphragm 3 and the outer peripheral edge 30 of the baffle 5 are bonded. Yes. Specifically, the peripheral side wall 43 of the baffle 5 is provided on the sheet adhesive 7 so as to contact the outer peripheral surface.

  In such a configuration, when the outer peripheral edge portion 30 of the baffle 5 is bonded and bonded to the outer peripheral edge portion 20 of the diaphragm 3, first, the baffle 5 is bonded to the first bonding surface 21 of the outer peripheral edge portion 20. The outer peripheral edge 30 of the baffle 5 is moved toward the sheet adhesive 7 (in the direction of arrow A in FIG. 6).

  Subsequently, the boss portion 41 of the outer peripheral edge portion 30 is brought into contact with the sheet-like adhesive 7 before the second adhesive surface 31, and a part of the sheet-like adhesive 7 is moved by the boss portion 41. Press toward the first adhesive surface 21. The second adhesive surface 31 is pressed against the sheet adhesive 7 while continuing this pressing.

  Accordingly, the second adhesive surface 31 can be bonded to the one surface of the sheet-like adhesive 7 in a state of being bonded to the first adhesive surface 21 by the other adhesive surface. Become. That is, the outer peripheral edge 30 of the baffle 5 can be adhesively bonded to the outer peripheral edge 20 of the diaphragm 3.

  Therefore, when the outer peripheral edge 30 is pressed against the sheet adhesive 7 in order to adhesively bond the outer peripheral edge 30 of the baffle 5 to the outer peripheral edge 20 of the diaphragm 3, It is possible to prevent the sheet-like adhesive 7 from being excessively deformed (such as bending) or / and displaced so as to interfere with the diaphragm 3.

  When the boss 41 presses a part of the sheet adhesive 7, the relatively small boss 41 is scattered on the second adhesive surface 31 (the outer peripheral edge 30). Since it is merely provided, the sheet-like adhesive 7 is not excessively deformed (flexed or the like) or / and displaced due to the pressing of the boss portion 41.

  Then, in order to prevent water from entering through the space 25 from the sound hole 24, a close contact portion between the sheet adhesive 7 and the first adhesive surface 21 and the second adhesive surface 31 is sufficiently provided. It can be secured. Therefore, it is possible to suppress a decrease in acoustic performance and waterproof performance of the speaker 1 due to deformation and displacement of the sheet adhesive 7.

  In the speaker 1, the speaker 1 is bonded and bonded to the case 52 of the portable electronic device using another sheet-like adhesive 51 when the speaker 1 is applied to a portable electronic device such as a mobile phone. Another boss portion may be provided on the flat surface (upper surface) 54 of the baffle 5.

  For example, as shown in FIG. 7, when the case 52 is adhesively bonded to the baffle 5, the other boss 55 is bonded to the flat surface 54 of the baffle 5. It protrudes from the said surface 54 so that the state which pressed a part of agent 51 can be hold | maintained.

  In this case, the case 52 has a flat back surface (lower surface) 57 that can be bonded to the other sheet-like adhesive 51 and another sound hole 58, and the sheet-like adhesive 51 is attached to the baffle 5. The speaker 1 can be installed inside the case 52 so as to be sandwiched between the front surface 54 and the back surface 57 of the case 52.

  Therefore, when the case 52 is pressed against the other sheet-like adhesive 51 in order to adhesively bond the back surface 57 of the case 52 to the front surface 54 of the baffle 5, the other sheet-like adhesive 51 is Excessive deformation (deflection) or / and displacement of the sound hole 58 can be prevented as much as possible. Therefore, it is possible to suppress a decrease in acoustic performance of the speaker 1.

DESCRIPTION OF SYMBOLS 1 Speaker 2 Magnetic circuit 3 Diaphragm 4 Voice coil 5 Baffle 6 Frame 7 Sheet-like adhesive 15 Magnetic gap 20 Outer peripheral part of diaphragm 21 First adhesive surface 24 Sound hole 30 Outer peripheral part of baffle 31 Second adhesive surface

Claims (2)

A magnetic circuit;
A diaphragm disposed on one side of the magnetic circuit;
A voice coil disposed in the magnetic gap of the magnetic circuit and coupled to the diaphragm;
A baffle having a sound hole for emitting sound and disposed on the opposite side of the magnetic circuit with respect to the diaphragm so as to cover the diaphragm;
A frame for holding the magnetic circuit, the diaphragm and the baffle;
In order to adhesively bond the outer peripheral edge of the diaphragm and the outer peripheral edge of the baffle, a speaker comprising a sheet-like adhesive disposed between these outer peripheral edges,
The outer peripheral edge of the diaphragm is
A flat first adhesive surface that can be bonded to the sheet-like adhesive;
The outer peripheral edge of the baffle is
A second adhesive surface capable of adhering to the sheet-like adhesive;
After the sheet adhesive is bonded to the first adhesive surface, a part of the sheet adhesive is directed toward the first adhesive surface while the second adhesive surface is bonded to the sheet adhesive. And a boss protruding from the second adhesive surface so that the pressed state can be maintained.   The speaker according to claim 1, wherein the boss portions are arranged at predetermined intervals in the circumferential direction of the outer peripheral edge portion of the baffle.

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