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DESCRIPTION JP2005151210

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DESCRIPTION JP2005151210
PROBLEM TO BE SOLVED: To provide a "speaker device" capable of promoting thinning of the
entire device including a speaker main body. SOLUTION: The speaker device is roughly
constituted by a speaker main body 21, an installation base material 22 and an attaching
member 23, and the speaker main body 21 comprises a magnetic circuit 24 and a voice coil 26
wound around a bobbin 25. A diaphragm 27 and a damper 31 connected to the rear end of the
bobbin 25; a frame 29 for supporting the outer periphery of the diaphragm 27; a cover 30 for
supporting the outer periphery of the damper 31; And a dustproof cap 32 for closing the lid. The
mounting member 23 is screwed and fixed to the rear wall 22a of the installation base material
22, and the dustproof cap 32 is provided with a relief 32a for avoiding interference with the
screwing fixing portion. Further, a notch 24a is provided at the rear end of the magnetic circuit
24 to avoid interference with the relief 32a. [Selected figure] Figure 1
Speaker device
[0001]
The present invention relates to an electrodynamic speaker device in which a speaker main body
is attached to an installation base material, and more particularly to a speaker device suitable for
thinning.
[0002]
Conventionally, by arranging a magnetic circuit in the opening direction of a conical diaphragm
and surrounding the bobbin in a skirt shape with this diaphragm, an electrodynamic speaker
suitable for thinning with the overall height dimension suppressed. A main body is known (for
example, refer to patent documents 1).
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[0003]
FIG. 4 is an explanatory view showing a conventional speaker apparatus provided with such a
speaker main body.
The speaker device shown in the figure includes a speaker body 1, an installation base material
(speaker box) 2 to which the speaker body 1 is attached, and a speaker body 1 screwed to the
rear wall 2a of the installation base material 2. It is mainly comprised by the attachment member
3 to hold | maintain.
The speaker body 1 comprises 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 cone-shaped cone paper
etc. The diaphragm 7 adhesively fixed to the rear end of the frame, the frame 9 fixed to the
magnetic circuit 4 to support the outer peripheral portion of the diaphragm 7 via the outer
peripheral edge portion 8, and fixed to the side wall 9a of the frame 9 The cover 10, the damper
11 whose inner periphery is connected to the rear end of the bobbin 5 and the outer periphery at
the fixed end is attached to the cover 10, and the dustproof cover attached to the rear end of the
bobbin 5 Since the cap 12 is provided and the diaphragm 7 surrounds the bobbin 5 at a
predetermined taper angle, the overall height dimension is suppressed. Further, the magnetic
circuit 4 includes an annular magnet 13 magnetized in 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. And a top plate 15 forming a magnetic gap G therebetween.
[0004]
In the installation base material 2, a plurality of peripheral edge holding portions 2c are provided
around the storage space 2b in which the speaker main body 1 is disposed, and outer peripheries
of the frame 9 and the cover 10 are It collectively screw-fixes to the periphery holding part 2c.
Further, a central holding portion 2d is provided on the rear wall portion 2a of the installation
base material 2, and a central portion of the speaker main body 1 is disposed in front of the
central holding portion 2d. The outer peripheral portion of the mounting member 3 interposed
between the rear wall portion 2 a of the installation base material 2 and the speaker main 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
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installation base material 2, and the mounting screw 16 passing through the central holding
portion 2d is screwed into the female screw portion 3a for fastening As a result, the speaker
main body 1 is fixed to the central holding portion 2 d in a state where the cover 10 is pulled
rearward via the mounting member 3. That is, since the speaker body 1 is positioned and fixed to
the peripheral edge holding portion 2c at a plurality of locations on the outer peripheral portion,
and pulled and fixed to the central holding portion 2d from behind via the mounting member 3,
sufficiently large mounting strength is ensured The speaker body 1 is therefore rigidly attached
to the installation base material 2.
[0005]
In the speaker device configured as described above, the voice coil 6 is vibrated by the
electromagnetic force when the voice current is supplied to the voice coil 6 through the lead wire
(not shown) through the lead wire (not shown). The diaphragm 7 is driven to vibrate and can
perform radio sound, reproduction sound of various recording media, and the like. Japanese
Patent Application Laid-Open No. 4-111597 (page 2, FIG. 1)
[0006]
In the conventional speaker device described above, although the speaker main body 1 is
configured to be suitable for thinning, the screw cap fixing portion (female screw portion 3 a or
the attachment) that follows the diaphragm 7 and vibrates following the diaphragm 7 In order
not to abut on the screw 16 or the like, it is necessary to secure a wide space between the
dustproof cap 12 and the mounting member 3 facing each other. As a result, in the storage space
2b of the installation base material 2, the depth dimension required behind the speaker main
body 1 becomes large, which has been a factor that hinders the thinning of the entire speaker
device.
[0007]
The present invention has been made in view of the above-described circumstances of the prior
art, and an object thereof is to provide a speaker device capable of promoting thinning of the
entire device including the speaker main body.
[0008]
The speaker device according to the present invention avoids interference with the dustproof
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cap, which is concerned when the dustproof cap vibrates, to the dustproof cap facing the
mounting member screwed and fixed to the wall of the installation base material. In addition to
providing a relief for the magnetic circuit, a notch is provided in the magnetic circuit so that the
relief does not contact the magnetic circuit during vibration.
[0009]
In the speaker device according to the present invention, even if the distance between the
dustproof cap vibrating with the diaphragm and the mounting member for holding the speaker
body is narrowed, the dustproof cap having the relief portion does not contact the mounting
member or mounting screw. Since the magnetic circuit is provided with a notch so that the relief
portion does not abut on the magnetic circuit at the time of vibration, it is not necessary to widen
the distance between the dustproof cap and the magnetic circuit.
Therefore, the thickness reduction of the entire speaker device including the installation base
material can be promoted without impairing the thickness reduction of the speaker body.
[0010]
In the present invention, the speaker main body, an installation base material to which the
speaker main body is attached, and a mounting member which is screwed and fixed to a wall
portion of the installation base material and holds the speaker main 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 peripheral portion connected to the bobbin and
surrounding the bobbin, the magnetic circuit A speaker apparatus including: a frame fixed to the
frame for supporting the outer peripheral portion of the diaphragm via an outer peripheral edge;
and a dustproof cap closing the end of the bobbin and facing the mounting member The cap is
provided with a relief for avoiding interference with the screw fixing portion, and the magnetic
circuit is provided with a notch for avoiding interference with the relief.
[0011]
In the speaker device in which the screw fixing part consisting of the female screw of the
mounting member and the mounting screw exists at the position opposite to the dustproof cap of
the speaker main body, the dustproof cap at the time of vibration does not abut the screw fixing
part. Although the speaker apparatus having the above-described configuration has a relief
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portion capable of avoiding interference with the screwing fixing portion in the dustproof cap,
the dustproof cap, the mounting member, and the wall portion of the mounting base material
There is no need to secure a wide interval between them.
Further, in the speaker device, the magnetic circuit is provided with the notch portion capable of
avoiding the interference with the relief portion, so that there is no fear that the dustproof cap at
the time of vibration abuts on the magnetic circuit.
As a result, the speaker main body can be disposed close to the mounting member and the
installation base material without impairing the reduction in thickness of the speaker main body,
so that the entire speaker device including the installation base material can be thinned.
[0012]
In the above configuration, it is preferable that the installation base material be 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 be fixed to these peripheral edge holding
portions. As a result, not only the central portion of the speaker main body is screwed and fixed
to the installation base material via the mounting member, but also multiple places on the outer
peripheral portion are fixed to the peripheral edge holding portion. The speaker body can be
attached to the installation base material with strength.
[0013]
An embodiment will be described with reference to the drawings. FIG. 1 is a cross-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 is a movable range of a dustproof cap of the speaker device. FIG.
[0014]
The speaker device shown in these figures is screwed and fixed to the speaker main body 21, an
installation base material (speaker box) 22 for housing and holding the speaker main body 21,
and the rear wall 22 a of the installation base material 22. It is mainly comprised by the
attachment member 23 holding the speaker main body 21. As shown in FIG.
[0015]
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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 cone-shaped
cone paper etc. A diaphragm 27 adhesively fixed to the rear end of the bobbin 25; a frame 29
fixed to the magnetic circuit 24 to support the outer peripheral portion of the diaphragm 27 via
the outer peripheral edge 28; and the outer peripheral portion of the frame 29 And a damper 31
whose inner periphery is connected to the rear end of the bobbin 25 and whose outer periphery
at the fixed end is attached to the cover 30, and a convex relief 32a. A dustproof cap 32 attached
at a position closing the rear end of the bobbin 25; and a damper 33 having an inner periphery
fixed to the fixed end attached to the magnetic circuit 24 and an outer periphery connected to
the diaphragm 27 The diaphragm 27 has a predetermined pressure. Height of the whole for
surrounding the bobbin 25 and the magnetic waterway 24 is suppressed by the path angle.
The relief portion 32a provided at the central portion of the dustproof cap 32 is for avoiding
interference with a screwing fixing portion (a fastening portion between a female screw portion
23a described later and the mounting screw 37 described later) located behind the relief portion
32a. .
The cover 30 may be integrally formed with the mounting member 23, and the dustproof cap 32
can also be integrally formed on the inner peripheral portion of the diaphragm 27.
[0016]
The magnetic circuit 24 has a pole piece 34 having a tapered notch 24a at the rear end inner
edge, and an annular magnet 35 magnetized in the radial direction and fixed to the outer
periphery of the pole piece 34; It is an inner magnet type constituted by a yoke 36 having a
cylindrical portion 36a 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 36a of the yoke 36.
It is formed. However, the magnetic circuit 24 may be of 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 tapered concave or a curved concave.
[0017]
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A plurality of peripheral edge holding parts 22 c are provided in the installation base material 22
at positions facing the outer peripheral part of the frame 29 around the storage space 22 b in
which the speaker main body 21 is disposed. The outer peripheral portions of the cover 30 are
collectively screwed to the peripheral edge holding portion 22c. Further, a central holding
portion 22 d is provided on the rear wall portion 22 a of the installation base material 22, and
the central portion of the speaker main body 21 is disposed in front of the central holding
portion 22 d. The outer periphery of the mounting member 23 interposed between the rear wall
22 a of the installation base material 22 and the speaker body 21 is fixed to the rear end of the
cover 30 by an appropriate means such as welding. The mounting member 23 is provided with a
female screw portion 23a located on the central holding portion 22d of the installation base
material 22, and the mounting screw 37 penetrating the central holding portion 22d is screwed
to the female screw portion 23a and fastened. Thus, the speaker main body 21 is fixed to the
central holding portion 22 d in a state where the cover 30 is pulled rearward via the mounting
member 23. As a result, the speaker body 21 is positioned and fixed to the peripheral edge
holding portion 22c at a plurality of locations on the outer peripheral portion and pulled and
fixed to the central holding portion 22d from behind via the mounting member 23, so the
speaker body 21 is sufficiently large. The mounting strength can be secured, and hence the
speaker body 21 is firmly attached to the installation base material 22.
[0018]
In the speaker device configured as described above, when the voice current is supplied to the
voice coil 26 through the lead wire (not shown), the speaker body 21 vibrates the voice coil 26
by the electromagnetic force, so The diaphragm 27 is driven and vibrates through the diaphragm
27 so that radio sound and reproduction sound of various recording media can be amplified.
[0019]
In the speaker device according to the present embodiment, in consideration of the fact that the
screwing fixing portion which is a fastening portion between the female screw portion 23a and
the mounting screw 37 protrudes from the rear wall 22a of the installation base material 22
toward the dustproof cap 32. Since the relief portion 32a for avoiding interference with the
screw fixing portion is provided in the central portion of the dustproof cap 32 in advance, the
dustproof cap 32 and the mounting member 23 and the rear wall 22a of the installation base
material 22 are provided. There is no need to secure a wide interval between the
That is, in FIG. 3, the distance D1 between the dustproof cap 32 and the mounting member 23 in
the stationary state may be set to a value slightly larger than the maximum amplitude of the
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dustproof cap 32. Further, in the case of the speaker main body 21, in consideration of the
convex shape in which the relief portion 32a protrudes toward the magnetic circuit 24, a tapered
notch 24a is provided in advance at the rear end inner edge of the pole piece 34. Even if the
interval D2 (see FIG. 3) between the dustproof cap 32 at rest and the magnetic circuit 24 is not
particularly extended, there is no concern that the dustproof cap 32 in vibration abuts on the
front pole piece 34. Therefore, since the speaker body 21 can be disposed close to the rear wall
22 a of the installation base material 22 without impairing the thinning of the speaker body 21,
the thinning of the entire device is promoted. There is.
[0020]
Needless to say, the shape of the relief portion 32 a of the dustproof cap 32 can be appropriately
selected according to the shape of the female screw portion 23 a and the like. Further, since the
notch 24a may be provided in the magnetic circuit 24 at a portion facing the relief 32a, the
shape of the notch 24a may be appropriately selected according to the shape of the relief 32a,
the configuration of the magnetic circuit 24, etc. It is also natural that it is possible. Further, the
installation base material 22 is not limited to a box-like one like a speaker box, but may be a
simple plate-like mounting plate.
[0021]
It is a sectional view of a speaker device concerning an example of the present invention. It is a
front view of this speaker apparatus. 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 sign
[0022]
Reference Signs List 21 speaker main body 22 installation base material 22a back wall 22c
peripheral edge holding portion 22d center retaining portion 23 attachment member 23a female
screw portion 24 magnetic circuit 24a notch 25 bobbin 26 voice coil 27 diaphragm 28 outer
peripheral edge 29 frame 30 cover 31 damper 32 Dustproof cap 32a Relief part 34 Pole piece
35 Magnet 36 Yoke 37 Mounting screw G Magnetic gap
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