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JP2005151318

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2005151318
PROBLEM TO BE SOLVED: To provide a "speaker" in which the amount of maximum amplitude
allowed for a diaphragm is increased without adversely affecting the operation characteristics in
the high frequency range and thinning. SOLUTION: A speaker 21 supports a magnetic circuit 22,
a voice coil 24 wound around a bobbin 23, a diaphragm 25 adhesively fixed to a base end of the
bobbin 23, and an inner peripheral portion of the diaphragm 25. , A frame 27 for supporting the
outer peripheral portion of the diaphragm 25 through the outer peripheral edge portion 26, a
cover 28 for supporting the outer peripheral portion of the damper 29, and a dustproof cap 30
crowned to the bobbin 23 A flat annular flat portion 25 a is provided around the entire inner
periphery of the diaphragm 25. The outer diameter of the annular flat portion 25a is set to be
substantially the same as the outer diameter of the end face 33b of the magnetic circuit 22 on
the side facing the annular flat portion 25a, and the inner peripheral portion of the damper 29
on the annular flat portion 25a. The outer periphery of the dustproof cap 30 is adhesively fixed.
[Selected figure] Figure 1
スピーカ
[0001]
The present invention relates to an electrodynamic speaker, and more particularly to a speaker
that can be easily thinned and is suitable for use in vehicles and the like.
[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 is obtained. It is known (for
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example, refer to patent documents 1).
[0003]
FIG. 3 is a cross-sectional view showing such a conventional electrodynamic speaker.
The speaker 1 shown in the figure includes a magnetic circuit 2 having a magnetic gap G, a voice
coil 4 wound around a bobbin 3 and disposed in the magnetic gap G, and a cone-shaped cone
paper or the like, and has an inner circumferential portion. The diaphragm 5 bonded and fixed to
the base end of the bobbin 3, the frame 7 fixed to the magnetic circuit 2 and supporting the
outer peripheral portion of the diaphragm 5 via the outer peripheral edge 6, and the outer
peripheral portion of the frame 7 A fixed cover 8, a damper 9 whose inner periphery is
connected to the base end of the bobbin 3 and whose outer periphery on the fixed end is
attached to the cover 8, and a dustproof cap 10 which is crowned on the bobbin 3 , And the
diaphragm 5 surrounds the bobbin 3 in a skirt shape, so that the overall height dimension is
suppressed.
The magnetic circuit 2 also includes a pole piece 11, an annular magnet 12 magnetized in the
radial direction and fixed to the outer peripheral portion of the pole piece 11, and a cylindrical
portion 13 a surrounding the magnet 12. It is an internal magnet type constituted by the yoke 13
on which the pole piece 11 is mounted and fixed, and a magnetic gap G is formed between the
magnet 12 and the cylindrical portion 13 a of the yoke 13.
[0004]
In the speaker 1 configured as described above, when a voice current is supplied to the voice coil
4 through a lead wire (not shown), the voice coil 4 is vibrated by the electromagnetic force. It is
driven to vibrate, and it is possible to perform radio sound such as radio sound and reproduction
sound of various recording media. JP-A-8-237794 (page 3-4, FIG. 4)
[0005]
In the conventional speaker 1 described above, the maximum amplitude allowed for the
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diaphragm 5 at the time of driving because a part of the diaphragm 5 surrounding the bobbin 3
in a skirt shape is close to the illustrated upper end face of the magnetic circuit 2. There is a
problem that the amount A is small, and as a result, the volume can not be set too high. When the
diaphragm 5 is vibrated with an amplitude larger than the maximum amplitude amount A, the
diaphragm 5 abuts on the upper end surface of the magnetic circuit 2 (yoke 13) in the figure,
thereby increasing the risk of damage or breakage. Further, in FIG. 3, when the outer peripheral
edge portion 6 is disposed upward in the drawing to increase the taper angle of the diaphragm 5,
the maximum amplitude amount A can be increased, but when the taper angle becomes large
This is not preferable because the operating characteristics of the plate 5 deteriorate.
[0006]
The present invention has been made in view of the circumstances of the prior art as described
above, and its object is to increase the maximum amount of amplitude allowed for the diaphragm
without adversely affecting the operation characteristics in the high frequency range and
thinning. It is to provide a speaker that
[0007]
In the loudspeaker according to the present invention, a flat annular flat portion is provided on
the entire inner periphery of the diaphragm connected to the bobbin, and the outer diameter of
the annular flat portion is opposed to the annular flat portion. The distance between the annular
flat portion and the end face of the magnetic circuit is made to be the maximum amount of
amplitude allowed for the diaphragm by setting it equal to or more than the outer diameter of
the end face of the circuit.
When such a configuration is adopted, the diaphragm does not interfere with the magnetic
circuit outside the annular flat portion in the radial direction, and therefore, the maximum
allowable for the diaphragm without adversely affecting the operation characteristics and
thinning in the high frequency range. A speaker with increased amplitude can be realized.
[0008]
The speaker according to the present invention is provided with an annular flat portion on the
inner peripheral portion of the diaphragm, and the diaphragm does not interfere with the
magnetic circuit outside the annular flat portion in the radial direction. The maximum amount of
amplitude allowed for the diaphragm can be increased without adversely affecting thinning, and
the volume is not undesirably constrained.
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[0009]
In the present invention, a voice coil wound around a bobbin, a magnetic circuit having a
magnetic gap in which the voice coil is disposed, a diaphragm connecting an inner peripheral
portion to the bobbin and surrounding the bobbin, the magnetism A frame fixed to a circuit and
supporting an outer peripheral portion of the diaphragm via an outer peripheral edge, and a
damper disposed on the opposite side of the magnetic circuit to the diaphragm and supporting
an inner peripheral portion of the diaphragm A speaker in which the diaphragm is driven by
energizing the voice coil, a flat annular flat portion is provided on the entire inner periphery of
the diaphragm, and the outside of the annular flat portion is provided. The diameter is set to be
equal to or larger than the outer diameter of the end face of the magnetic circuit on the side
facing the annular flat portion.
[0010]
In the speaker thus configured, there is no possibility that the diaphragm interferes with the
magnetic circuit outside the annular flat portion in the radial direction, so the distance between
the annular flat portion and the end face of the magnetic circuit facing this is the diaphragm The
maximum amount of amplitude allowed for
Therefore, the maximum amount of amplitude allowed for the diaphragm can be increased
without impairing the thinning of the speaker, and the volume need not be undesirably restricted.
Further, since it is not necessary to increase the taper angle of the diaphragm in order to secure
the maximum amount of amplitude, the operating characteristics of the diaphragm in the high
frequency range are not degraded.
[0011]
In the above configuration, by providing a dustproof cap for closing the open end of the bobbin
and bonding and fixing the bottom surface of the outer periphery of the dustproof cap to the
annular flat portion of the diaphragm, the adhesion area of the dustproof cap can be increased
without difficulty. It is preferable because
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[0012]
Further, in the above configuration, by bonding and fixing the inner peripheral portion of the
damper to the annular flat portion, the damper can be surface-bonded to the diaphragm, so that
the bonding strength can be enhanced and the bonding operation can be facilitated.
[0013]
An embodiment will be described with reference to the drawings. FIG. 1 is a cross-sectional view
of a loudspeaker according to this embodiment, and FIG. 2 is an explanatory view showing an
arrow P portion in FIG.
[0014]
The speaker 21 shown in FIG. 1 includes a magnetic circuit 22 having a magnetic gap G, a voice
coil 24 wound around a bobbin 23 and disposed in the magnetic gap G, and a cone-shaped cone
paper or the like. A diaphragm 25 adhesively fixed to the end, a frame 27 fixed to the magnetic
circuit 22 to support the outer peripheral portion of the diaphragm 25 via the outer peripheral
edge portion 26, a cover fixed to the outer peripheral portion of the frame 27 28, a damper 29
whose inner periphery is connected to the base end of the bobbin 23 and whose outer periphery
at the fixed end is attached to the cover 28, and a dustproof cap 30 which is crowned on the
bobbin 23 Since the diaphragm 25 surrounds the bobbin 23 and the magnetic circuit 22 in a
skirt shape, the overall height dimension is suppressed.
A flat annular flat portion 25a is provided all around the inner circumferential portion of the
diaphragm 25, and the inner circumferential portion of the damper 29 and the outer
circumferential portion of the dustproof cap 30 are adhesive on the annular flat portion 25a. It is
fixed using 34 (see FIG. 2).
In the present embodiment, the respective members are surface-bonded in a state where the
inner peripheral portion of the damper 29 is sandwiched between the annular flat portion 25 a
and the dustproof cap 30.
The outer diameter d1 of the annular flat portion 25a is set to be equal to the outer diameter d2
of the end face 33b of the later-described cylindrical portion 33a of the magnetic circuit 22. The
magnetic circuit 22 includes a pole piece 31, an annular magnet 32 magnetized in the radial
direction and fixed to the outer periphery of the pole piece 31, and a cylindrical portion 33 a
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surrounding the magnet 32. It is an internal magnet type constituted by the yoke 33 on which
the piece 31 is mounted and fixed, and a magnetic gap G is formed between the magnet 32 and
the cylindrical portion 33 a of the yoke 33. However, the magnetic circuit 22 may be an external
magnet type.
[0015]
The voice coil 24 is vibrated by the electromagnetic force when the voice current is supplied to
the voice coil 24 through the lead wire (not shown), and thus the speaker body 21 configured as
described above has the diaphragm 25 through the bobbin 23. Is driven to vibrate, and it is
possible to perform radio sound such as radio sound and reproduction sound of various
recording media.
[0016]
In the speaker 21 according to the present embodiment, the outer diameter d1 of the annular flat
portion 25a provided on the inner peripheral portion of the diaphragm 25 is the outer diameter
d2 of the end face 33b of the magnetic circuit 22 facing the annular flat portion 25a. Even if the
diaphragm 25 is driven by the voice coil 24 and vibrates largely, the inclined portion on the
radially outer side of the annular flat portion 25a of the diaphragm 25 does not have to be in
contact with the magnetic circuit 22 even if driven by the voice coil 24. .
That is, in this speaker 21, since the distance B between the annular flat portion 25a and the end
face 33b of the magnetic circuit 22 opposed to this is the maximum amplitude amount allowed
for the diaphragm 25, the overall thickness of the device can be reduced The amount of
maximum amplitude can be increased without loss of power, and the volume need not be
undesirably constrained. Further, since it is not necessary to increase the taper angle of the
diaphragm 25 in order to secure the maximum amount of amplitude, the operation characteristic
(following ability) of the diaphragm 25 in the high frequency range is not deteriorated. Moreover,
when the annular flat portion 25a is provided on the inner circumferential portion of the
diaphragm 25, the inner circumferential portion of the damper 29 and the outer circumferential
portion of the dustproof cap 30 can be mounted on the annular flat portion 25a and fixed by
adhesion. Therefore, the bonding area of the damper 29 and the dustproof cap 30 can be
increased without difficulty, and there is also an advantage that the assemblability and reliability
are improved.
[0017]
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The annular flat portion 25a of the diaphragm 25 may be set larger in diameter than the end
face 33b of the magnetic circuit 22, but if the annular flat portion 25a is too large, the operating
characteristics of the diaphragm 25 in the high frequency range may be set. It is preferable that
the outer diameter of the annular flat portion 25a be equal to or slightly larger than the outer
diameter of the end face 33b because an adverse effect may be exerted.
[0018]
It is a sectional view of a speaker concerning an example of the present invention.
FIG. 2 is an enlarged view of a portion indicated by an arrow P in FIG.
Explanation of sign
[0019]
Reference Signs List 21 speaker 22 magnetic circuit 23 bobbin 24 voice coil 25 diaphragm 25a
annular flat portion 26 outer peripheral edge portion 27 frame 28 cover 29 damper 30
dustproof cap 31 pole piece 32 magnet 33 yoke 33 b end face 34 adhesive G magnetic gap
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