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JP2000350275

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2000350275
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
dynamic type speaker in which an amplifier is integrated, and more particularly to an amplifier
integrated type speaker suitable as a woofer for low frequency range reproduction.
[0002]
2. Description of the Related Art In car-mounted speakers and the like, a speaker incorporating
an amplifier has been proposed in order to save space in the entire sound device. FIG. 3 is a
cross-sectional view showing a conventional example of such an amplifier integrated speaker.
The speaker comprises a frame 1 made of resin or nonmagnetic material and having a magnetic
circuit storage portion 1a at the center rear end, and a diaphragm 2 made of cone paper or the
like and defining a mortar-like space on the front side. A magnetic circuit housing portion of the
frame 1 comprising a damper 3 for supporting the inner peripheral portion of the diaphragm 2
while allowing vibration, a voice coil 5 wound around the outer peripheral surface of a cylindrical
bobbin 4, a yoke and a magnet A magnetic circuit 6 housed and held in 1a and an amplifier 7
mounted on the rear of the frame 1 with various electronic components 9 mounted on the circuit
board 8 are schematically shown. The diaphragm 2 is supported by the damper 3 in a state
where the inner peripheral portion thereof is joined to the bobbin 4 and the outer peripheral
portion is supported by the frame 1 via the deformation joint portion 10 It is easy to vibrate
linearly in the vertical direction). Further, a voice coil 5 is disposed in a gap G formed in the
magnetic circuit 6, and the voice coil 5 and the amplifier 7 are connected via a lead (not shown).
The amplifier 7 is connected to an external power supply through the connector 11.
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[0003]
Since the voice coil 5 vibrates under the action of the electromagnetic force when a
predetermined voice current is supplied to the voice coil 5 through the connector 11 and the
amplifier 7, the amplifier-integrated speaker thus schematically configured as described above
The diaphragm 2 vibrates via the bobbin 4 so that radio sound or CD reproduction sound can be
amplified.
[0004]
The above-described conventional amplifier-integrated speaker has a thickness of the entire
speaker by disposing the amplifier 7 using the space around the magnetic circuit housing portion
1a projecting to the rear. Although it is considered not to increase, there is a problem that it is
difficult to achieve the desired size reduction and thickness reduction because the arrangement
space for the magnetic circuit 6 and the amplifier 7 has to be secured behind the diaphragm 2.
In particular, in the case of an on-vehicle speaker built into the door of a vehicle, water droplets
will flow into the back side during rainy weather, car wash, etc. In addition, therefore, the
thickness of the entire speaker was increased to deteriorate the space factor. Further, if the
amplifier 7 is covered with the shield plate, the heat generated from the various electronic
components 9 is easily accumulated inside the speaker at the time of energization, and the heat
radiation property is deteriorated, and the shield plate is required to be hermetically sealed. The
work was also cumbersome.
[0005]
Further, in the above-described conventional amplifier-integrated speaker, since it is difficult to
connect the terminal portion of the circuit board 8 and the voice coil 5 at a close distance, the
long lead wire derived from the amplifier 7 is bypassed to make the voice coil 5 It is connected
with the leader line of Therefore, in the case of a multi-channel speaker or the like having a large
number of voice coils 5, the number of the lead wires increases and the detour path also
becomes complicated, so connection work between each terminal portion of the circuit board 8
and each voice coil 5 is complicated. And there is also a problem that miswiring tends to occur.
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[0006]
SUMMARY OF THE INVENTION In the present invention, a magnetic circuit and an amplifier are
arranged using a space in front of a diaphragm. In such an amplifier-integrated speaker, since
various electronic parts of the amplifier are disposed on the front side of the speaker, it is not
necessary to take special waterproofing measures, and the heat radiation effect is enhanced, and
most of the speakers are behind the diaphragm. Since no component space is required, it
becomes easy to achieve a reduction in size and thickness of the entire speaker. Furthermore,
since the lead wire connecting the amplifier and the voice coil is short and there is no need to
make a complicated bypass, connection work with the amplifier can be performed accurately and
easily even when the number of voice coils is large.
[0007]
SUMMARY OF THE INVENTION In a loudspeaker according to the present invention, a voice coil,
a magnetic circuit having a gap in which the voice coil is disposed, a cone-shaped diaphragm
connected to the voice coil, and a circuit board A speaker comprising: an electronic component
mounted thereon; an amplifier connected to the voice coil via a lead wire; and the diaphragm
driven by energizing the voice coil via the amplifier; The circuit and the amplifier are disposed in
the front side space of the diaphragm.
[0008]
That is, if the magnetic circuit and the amplifier are disposed using the mortar-shaped space
formed on the front side of the cone-shaped diaphragm, there is no need to secure a wide
component space behind the diaphragm, so the entire speaker Can significantly reduce the
thickness dimension of the
At that time, in the case of a low frequency speaker (woofer), even if the front of the diaphragm is
partially covered with a magnetic circuit or an amplifier, almost no influence is exerted on the
sound quality. Further, since the amplifier is disposed on the front side of the speaker, which is
an open surface, the heat radiation effect is enhanced, and it is not necessary to cover the
amplifier with a shield plate or the like even when incorporated in the door of a vehicle.
[0009]
Further, in the above configuration, it is preferable that the magnetic circuit and the amplifier be
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supported by a common holding body, and the holding body be fixed to the frame.
[0010]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an
embodiment of the present invention will be described. FIG. 1 is a front view showing an
amplifier-integrated speaker for a bass according to an embodiment of the present invention, and
FIG. It is sectional drawing which follows.
[0011]
The low frequency speaker shown in FIGS. 1 and 2 is formed in a conical shape, so-called cone
shape, from a paper material or a synthetic resin, and a diaphragm 20 defining a mortar shaped
space on the front side, resin, nonmagnetic metal The first frame (supporter) 21 made of material
and disposed in front of the diaphragm 20, the voice coil 23 wound around the outer peripheral
surface of the cylindrical bobbin 22, yokes 24a and 24b, and a magnet 24c. A magnetic circuit
24 housed and held in the magnetic circuit housing portion 21 a of the first frame 21 and a first
one having an inner peripheral portion joined to the rear end side end face of the yoke 24 b and
an outer peripheral portion joined to the diaphragm 20. A damper 25 is mounted on the first
frame 21 so as to cover the magnetic circuit 24 by mounting various electronic components 28
on the circuit board 27, and is disposed behind the diaphragm 20 by its outer peripheral portion.
First frame A second frame 29 supporting the 21, is schematically constituted by a second
damper 30 which is an inner circumferential portion outer peripheral portion is bonded to the
bobbin 22 is joined to the second frame 29.
The voice coil 23 is disposed in the gap G of the magnetic circuit 24.
In the figure, reference numeral 31 denotes a connector attached to the second frame 29,
reference numeral 32 denotes a lead wire connecting the connector 31 and the circuit board 27,
and reference numeral 33 denotes a connection between the circuit board 27 and the voice coil
23. A lead wire 34 is a U-shaped modified joint held in the first and second frames 21 and 29.
The lead wire 33 derived from the circuit board 27 is connected to the lead wire of the voice coil
23 in a state supported by the diaphragm 20, and the amplifier 26 is externally connected via the
lead wire 32 and the connector 31. Connected to the power supply.
[0012]
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The inner peripheral portion of the diaphragm 20 is supported by the first and second dampers
25 and 30, and the outer peripheral portion of the diaphragm 20 is supported by the first and
second frames 21 and 29 via the deformation joint portion 34. It is done. Therefore, the
diaphragm 20 easily vibrates linearly in the front-rear direction (vertical direction in FIG. 2). A
bottomed cylindrical magnetic circuit housing 21a is formed at the center of the first frame 21 to
open rearward, and the diaphragm 20 is exposed around the magnetic circuit housing 21a. A
large opening 21b is provided. The first frame 21 is formed with four arm portions 21c and a
connecting portion 21d for connecting the magnetic circuit housing portion 21a and the outer
peripheral portion, and the arm portion 21c supports the circuit board 27 of the amplifier 26.
There is. The arm portion 21c and the connecting portion 21d are curved so that the inner
peripheral side has the same shape as the diaphragm 20, and the electronic component 28 of the
circuit board 27 is in the concave space formed by these curved portions. It is supposed to be
housed. That is, unlike the conventional product, the magnetic circuit 24 and the amplifier 26 of
the speaker are supported by the first frame 21 in front of the diaphragm 20, and the magnetic
circuit 24 and the amplifier 26 are almost entirely the diaphragm. 20 housed in a mortar-like
space on the front side.
[0013]
In the above-described amplifier-integrated speaker, when a predetermined audio current is
supplied to the voice coil 23 through the connector 31, the amplifier 26, the lead wire 33, and
the like, the voice coil 23 vibrates by the action of the electromagnetic force. The diaphragm 20
vibrates through the bobbin 22 so that radio sound or CD reproduction sound can be amplified.
At this time, the sound emitted from the diaphragm 20 passes through the opening 21b of the
first frame 21 and is emitted forward, but this speaker is for low-pitched sound and the opening
21b is sufficiently wide, so the sound quality There is no concern that the volume will be lost.
[0014]
As described above, in the present embodiment, since the amplifier 26 is disposed on the front
side of the speaker which is an open surface, excellent heat radiation effect can be expected, and
the amplifier 26 can be shielded even when incorporated in a vehicle door or the like. There is no
need to take special waterproofing measures such as covering with a plate, etc., and it is easy to
simplify installation and improve the space factor. Moreover, it is only necessary to secure an
arrangement space for the second frame 29 behind the diaphragm 20, and the magnetic circuit
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24 and the amplifier 26 are formed in the mortar-shaped space formed on the front side of the
cone-shaped diaphragm 20. It can be said that it is an advantageous configuration in promoting
the downsizing and thinning of the entire speaker. Further, since the speaker is disposed close to
the circuit board 27 so that the circuit board 27 directly faces the diaphragm 20, the lead wire of
the voice coil 23 is not greatly diverted from the lead wire 33 led from the circuit board 27. The
connection work with the amplifier 26 can be performed accurately and easily even if the
number of voice coils 23 is large.
[0015]
The present invention is carried out in the mode as described above, and exhibits the effects as
described below.
[0016]
Since the magnetic circuit and the amplifier are disposed in front of the diaphragm, it is not
necessary to take special waterproof measures such as a shield plate for the amplifier, and the
heat radiation effect is also enhanced.
In addition, since almost no component space is required behind the diaphragm, it is easy to
make the entire speaker thinner. Furthermore, since the lead wire connecting the amplifier and
the voice coil is short and there is no need to make a complicated bypass, connection work with
the amplifier can be performed accurately and easily even when the number of voice coils is
large. .
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