JP2005151210A - Speaker apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a "speaker apparatus" capable of promoting a low profile of the entire apparatus including a speaker body. <P>SOLUTION: The speaker apparatus is roughly configured of the speaker body 21, an installation base metal 22, and a fitting member 23. The speaker body 21 is provided with a magnetic circuit 24: a voice coil 26 wound on a bobbin 25; a diaphragm 27 and a damper 31 connected to the tail end of the bobbin 25; a frame 29 for supporting the periphery of the diaphragm 27; a cover 30 for supporting the periphery of the damper 31; and a dust proof cap 32 for closing the tail end of the bobbin 25. The fitting member 23 is screw-fastened to the rear wall 22a of the installation base metal 22 and the dust proof cap 32 is provided with an escape part 32a to avoid an interference with a screw-fastening fixed part. Moreover, the tail end of the magnetic circuit 24 is formed with a notch 24a to avoid an interference with the escape part 32a. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electrodynamic speaker device in which a speaker body is attached to an installation base material, and more particularly to a speaker device suitable for thinning.

  Conventionally, a magnetic circuit is arranged in the opening direction of a conical diaphragm, and the bobbin is surrounded in a skirt shape by this diaphragm, so that an electrodynamic speaker suitable for thinning with a reduced overall height is achieved. The main body is known (for example, refer to Patent Document 1).

  FIG. 4 is an explanatory view showing a conventional speaker device provided with such a speaker body. The speaker device shown in the figure includes a speaker main body 1, an installation base material (speaker box) 2 to which the speaker main body 1 is attached, and a speaker main body 1 that is screwed and fixed to a rear wall portion 2a of the installation base material 2. It is mainly comprised by the holding member 3 to hold | maintain. The speaker body 1 includes a magnetic circuit 4 having a magnetic gap G, a voice coil 6 wound around a bobbin 5 and disposed in the magnetic gap G, and a conical cone paper or the like. A diaphragm 7 bonded and fixed to the rear end portion, a frame 9 fixed to the magnetic circuit 4 and supporting the outer peripheral portion of the diaphragm 7 via an outer peripheral edge portion 8, and fixed to the side wall portion 9a of the frame 9 Cover 10, a damper 11 whose inner peripheral portion is connected to the rear end portion of bobbin 5 and whose outer peripheral portion on the fixed end side is attached to cover 10, and dust proof attached to the rear end portion of bobbin 5 A cap 12 is provided, and the diaphragm 7 surrounds the bobbin 5 at a predetermined taper angle, so that the overall height dimension is suppressed. The magnetic circuit 4 includes an annular magnet 13 magnetized along the axial direction, a yoke 14 having a pole piece portion 14a, and an outer peripheral surface of the pole piece portion 14a fixed to the bottom surface of the magnet 13. It is comprised by the top plate 15 which forms the magnetic gap G between them.

  The installation base material 2 is provided with a plurality of peripheral holding portions 2c around a storage space 2b in which the speaker main body 1 is arranged, and the outer peripheral portions of the frame 9 and the cover 10 are attached using mounting screws (not shown). The screws are collectively fixed to the peripheral edge holding portion 2c by screws. Further, a central holding portion 2d is provided on the rear wall portion 2a of the installation base material 2, and the central portion of the speaker body 1 is disposed in front of the central holding portion 2d. The attachment member 3 interposed between the rear wall portion 2a of the installation base material 2 and the speaker body 1 is fixed to the rear end portion of the cover 10 by an appropriate means. The mounting member 3 is provided with a female screw portion 3a mounted on the central holding portion 2d of the installation base material 2, and a fastening screw 16 penetrating the central holding portion 2d is screwed into the female screw portion 3a and fastened. Thus, the speaker main body 1 is fixed to the center holding portion 2d in a state where the cover 10 is pulled rearward through the attachment member 3. That is, since the speaker body 1 is positioned and fixed at the peripheral holding portion 2c at a plurality of positions on the outer peripheral portion, and is pulled and fixed to the central holding portion 2d via the mounting member 3 from the rear, a sufficiently large mounting strength is ensured. Therefore, the speaker main body 1 is firmly attached to the installation base material 2.

In the speaker device configured as described above, the speaker main body 1 vibrates through the bobbin 5 because the voice coil 6 vibrates due to electromagnetic force when a voice current is applied to the voice coil 6 via a lead wire (not shown). Then, the diaphragm 7 is driven and vibrates, so that a loud sound such as a radio sound or a reproduction sound of various recording media can be produced.
Japanese Patent Laid-Open No. 4-111597 (2nd page, FIG. 1)

  In the conventional speaker device described above, although the speaker main body 1 has a configuration suitable for thinning, the dust-proof cap 12 that vibrates following the diaphragm 7 has a screw fixing portion on the rear (female screw portion 3a or mounting). In order not to come into contact with the screw 16 or the like, a wide space must be secured between the dust cap 12 and the mounting member 3 facing each other. As a result, the depth dimension required behind the speaker main body 1 in the storage space 2b of the installation base material 2 becomes large, which is a factor that hinders the overall thinning of the speaker device.

  The present invention has been made in view of the actual situation of the prior art, and an object of the present invention is to provide a speaker device that can promote thinning of the entire device including the speaker body.

  The speaker device of the present invention avoids interference between the dust-proof cap facing the mounting member screwed and fixed to the wall portion of the installation base material and the screw-fixing portion that is a concern during vibration of the dust-proof cap. In order to prevent the escape portion from coming into contact with the magnetic circuit during vibration, a notch portion is provided in the magnetic circuit.

  In the speaker device of the present invention, even if the interval between the dustproof cap that vibrates together with the diaphragm and the mounting member that holds the speaker body is narrowed, the dustproof cap having the relief portion does not come into contact with the mounting member or the mounting screw. Since the notch is provided in the magnetic circuit so that the escape portion does not contact the magnetic circuit during vibration, it is not necessary to increase the distance between the dust-proof cap and the magnetic circuit. Therefore, the thinning of the entire speaker device including the installation base material can be promoted without impairing the thinning of the speaker body.

  The present invention includes a speaker body, an installation base material to which the speaker body is attached, and an attachment member that is fixed to the wall portion of the installation base material by screwing to hold the speaker body. A voice coil wound around a cylindrical bobbin, a magnetic circuit having a magnetic gap in which the voice coil is disposed, a diaphragm having an inner periphery connected to the bobbin and surrounding the bobbin, and the magnetic circuit The speaker device includes a frame that is fixed to the frame and supports the outer peripheral portion of the diaphragm via an outer peripheral edge portion, and a dust-proof cap that closes the end of the bobbin and faces the mounting member. The cap is provided with a relief portion for avoiding interference with the screw fixing portion, and the magnetic circuit is provided with a notch portion for avoiding interference with the relief portion.

  In a speaker device in which a screw fixing part consisting of a female thread part of the mounting member or a mounting screw exists at a position facing the dustproof cap of the speaker body, consider that the dustproof cap does not come into contact with the screw fixing part during vibration. However, in the speaker device having the above-described configuration, the dustproof cap is provided with a relief portion that can avoid interference with the screwing fixing portion, so that the dustproof cap, the mounting member, and the wall portion of the installation base material are separated from each other. It is not necessary to secure a wide space between them. Further, in this speaker device, since the magnetic circuit is provided with a cutout portion that can avoid interference with the escape portion, there is no fear that the dustproof cap will come into contact with the magnetic circuit during vibration. As a result, the speaker body can be placed close to the mounting member and the installation base material without impairing the thinning of the speaker body, so that the entire speaker device including the installation base material can be thinned.

  In the above configuration, it is preferable that the installation base material is provided with a plurality of peripheral edge holding portions facing the outer peripheral portion of the speaker body, and the outer peripheral portion of the frame is fixed to these peripheral edge holding portions. As a result, the loudspeaker body is not only fixed to the installation base material via the mounting member, but also a plurality of outer peripheral parts are fixed to the peripheral holding part. The speaker body can be attached to the installation base material with strength.

  Embodiments will be described with reference to the drawings. FIG. 1 is a sectional view of a speaker device according to an embodiment of the present invention, FIG. 2 is a front view of the speaker device, and FIG. 3 shows a movable range of a dust cap of the speaker device. It is explanatory drawing shown.

  The speaker apparatus shown in these drawings is fixed to the speaker main body 21, the installation base material (speaker box) 22 that houses and holds the speaker main body 21, and the rear wall portion 22 a of the installation base material 22 with screws. It is mainly comprised by the attachment member 23 which hold | maintains the speaker main body 21. FIG.

  The speaker body 21 includes a magnetic circuit 24 having a magnetic gap G, a voice coil 26 wound around a cylindrical bobbin 25 and disposed in the magnetic gap G, and a conical cone paper. Is bonded to the rear end of the bobbin 25, a frame 29 is fixed to the magnetic circuit 24 and supports the outer peripheral portion of the diaphragm 27 via an outer peripheral edge portion 28, and an outer peripheral portion of the frame 29. A cover 30 fixed to the inner periphery, a damper 31 whose inner peripheral portion is connected to the rear end portion of the bobbin 25 and whose outer peripheral portion on the fixed end side is attached to the cover 30, and a convex relief portion 32a. A dust cap 32 attached to a position where the rear end of the bobbin 25 is closed, and a damper 33 having an inner peripheral portion attached to the fixed end side attached to the magnetic circuit 24 and an outer peripheral portion connected to the diaphragm 27; And the diaphragm 27 has a predetermined Height of the whole for surrounding the bobbin 25 and the magnetic waterway 24 is suppressed by the path angle. The escape portion 32a provided in the central portion of the dust cap 32 is for avoiding interference with a screw fixing portion (a fastening portion between a female screw portion 23a and a mounting screw 37 described later) positioned behind the escape portion 32a. . Note that the cover 30 may be integrally formed with the mounting member 23, and the dustproof cap 32 may be integrally formed on the inner peripheral portion of the diaphragm 27.

  The magnetic circuit 24 includes a pole piece 34 having a tapered notch 24a at the inner edge of the rear end, an annular magnet 35 that is magnetized along the radial direction and fixed to the outer periphery of the pole piece 34, This is an internal magnet type constituted by a yoke 36 having a cylindrical portion 36 a surrounding the magnet 35 and integrated with the pole piece 34, and a magnetic gap G is formed between the magnet 35 and the cylindrical portion 36 a of the yoke 36. Is formed. However, the magnetic circuit 24 may be an external magnet type. The notch 24a provided at the rear end of the pole piece 34 is for avoiding interference with the escape portion 32a, and may be a curved concave surface without being limited to a tapered shape.

  The installation base material 22 is provided with a plurality of peripheral edge holding portions 22 c around the storage space 22 b in which the speaker main body 21 is disposed, at a position facing the outer peripheral portion of the frame 29. And each outer peripheral part of the cover 30 is screwed and fixed to the peripheral holding part 22c collectively. Further, a central holding portion 22d is provided on the rear wall portion 22a of the installation base material 22, and the central portion of the speaker body 21 is disposed in front of the central holding portion 22d. The mounting member 23 interposed between the rear wall portion 22a of the installation base material 22 and the speaker main body 21 has its outer peripheral portion fixed to the rear end portion of the cover 30 by appropriate means such as welding. The mounting member 23 is provided with a female screw portion 23a positioned on the central holding portion 22d of the installation base material 22. The mounting screw 37 penetrating the central holding portion 22d is screwed into the female screw portion 23a and fastened. Thus, the speaker main body 21 is fixed to the center holding portion 22d in a state where the cover 30 is pulled rearward through the mounting member 23. As a result, the speaker body 21 is positioned and fixed at the peripheral holding portion 22c at a plurality of positions on the outer peripheral portion, and is pulled and fixed to the central holding portion 22d via the mounting member 23 from the rear. The attachment strength can be ensured, and therefore the speaker body 21 is firmly attached to the installation base material 22.

  In the speaker device configured as described above, the speaker main body 21 causes the bobbin 25 to vibrate because the voice coil 26 vibrates due to electromagnetic force when a voice current is applied to the voice coil 26 via a lead wire (not shown). Accordingly, the diaphragm 27 is driven and vibrated, so that a loud sound such as a radio sound and a reproduction sound of various recording media can be produced.

  The speaker device according to the present embodiment takes into account that a screw fixing portion, which is a fastening portion between the female screw portion 23a and the mounting screw 37, protrudes from the rear wall portion 22a of the installation base material 22 toward the dustproof cap 32. Since the escape portion 32a for avoiding interference with the screw fixing portion is provided in the center of the dust cap 32 in advance, the dust cap 32, the mounting member 23, and the rear wall portion 22a of the installation base material 22 are provided. There is no need to secure a wide interval between the two. That is, in FIG. 3, the distance D <b> 1 between the dustproof cap 32 and the attachment member 23 when stationary may be set to a value slightly larger than the maximum amplitude of the dustproof cap 32. Further, the speaker main body 21 is provided with a tapered notch 24a in advance at the inner edge of the rear end of the pole piece 34 in consideration of the convex shape of the escape portion 32a protruding toward the magnetic circuit 24. Even if the distance D2 (see FIG. 3) between the dust-proof cap 32 and the magnetic circuit 24 at rest is not particularly wide, there is no concern that the dust-proof cap 32 will come into contact with the front pole piece 34 during vibration. Therefore, the speaker device can be disposed close to the rear wall portion 22a of the installation base material 22 without impairing the thinning of the speaker main body 21, thereby promoting the thinning of the entire device. Yes.

  Needless to say, the shape of the relief portion 32a of the dust-proof cap 32 can be appropriately selected according to the shape of the female screw portion 23a and the like. In addition, since the magnetic circuit 24 only needs to be provided with a notch 24a at a portion facing the relief 32a, the shape of the notch 24a is appropriately selected according to the shape of the relief 32a, the configuration of the magnetic circuit 24, and the like. Of course, it is possible. Further, the installation base material 22 is not limited to a box shape like a speaker box, but may be a simple plate-shaped mounting plate.

It is sectional drawing of the speaker apparatus based on the Example of this invention. It is a front view of the speaker device. It is explanatory drawing which shows the movable range of the dustproof cap of this speaker apparatus. It is explanatory drawing of the speaker apparatus which concerns on a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 21 Speaker main body 22 Installation base material 22a Back wall part 22c Peripheral holding part 22d Center holding part 23 Mounting member 23a Female thread part 24 Magnetic circuit 24a Notch part 25 Bobbin 26 Voice coil 27 Diaphragm 28 Outer peripheral edge part 29 Frame 30 Cover 31 Damper 32 Dust-proof cap 32a Escape part 34 Pole piece 35 Magnet 36 Yoke 37 Mounting screw G Magnetic gap

Claims (2)

A speaker body, an installation base material to which the speaker body is attached, and an attachment member that holds the speaker body by being screwed to a wall of the installation base material,
The speaker body includes a voice coil wound around a cylindrical bobbin, a magnetic circuit having a magnetic gap in which the voice coil is disposed, and a vibration whose inner periphery is connected to the bobbin and surrounds the bobbin. A plate, a frame that is fixed to the magnetic circuit and supports the outer peripheral portion of the diaphragm via an outer peripheral edge portion, and a dust cap that closes the end of the bobbin and faces the mounting member. In the speaker device,
The dust-proof cap is provided with a relief portion for avoiding interference with the screw fixing portion, and the magnetic circuit is provided with a notch portion for avoiding interference with the relief portion. Speaker device. 2. The apparatus according to claim 1, wherein the installation base material is provided with a plurality of peripheral holding portions facing the outer peripheral portion of the speaker body, and the outer peripheral portion of the frame is fixed to the peripheral holding portions. A speaker device.

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