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JPH0795690

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DESCRIPTION JPH0795690
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker unit to which an acoustic signal (audio signal) is supplied to reproduce sound.
[0002]
2. Description of the Related Art As a cone type speaker unit for reproducing music or the like,
there is one configured as shown in FIG. In FIG. 1, 11 indicates an outer peripheral side center
plate, 12 a bottom plate, 13 a magnet, and 14 an inner peripheral side center plate. The outer
peripheral side center plate 11, the bottom plate 12, the magnets 13 and the inner peripheral
center plate 14 The magnetic circuit is configured by the above, and the magnet 13 is disposed
on the inner peripheral side. A through hole is formed in the central portion of the magnet 13 on
the inner peripheral side, the bottom plate 12 and the inner peripheral center plate 14. In this
magnetic circuit, a predetermined gap is formed between the innermost peripheral portion 11a
of the outer peripheral side center plate 11 and the outermost peripheral portion 14a of the
inner peripheral side center plate 14, and a voice coil 24 described later is formed in this gap. Is
placed. Then, the frame 15 is attached on the outer peripheral side center plate 11, and the edge
portion 22 of the diaphragm 20 is supported by the pressing member 16 at the annular
outermost peripheral portion of the frame 15.
[0003]
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The diaphragm 20 is composed of a circular cone 21, an edge 22 of the outer periphery thereof,
a center cap 23 and a coil bobbin 24 at the center, and a voice coil 25 is wound around the coil
bobbin 24. Then, the coil bobbin 24 on which the voice coil 25 is wound is inserted into the gap
formed between the innermost peripheral portion 11 a of the outer peripheral side center plate
11 and the outermost peripheral portion 14 a of the inner peripheral side center plate 14. . At
this time, the dampers 26 and 27 are attached to the upper and lower coil bobbins 24 of the
voice coil 25, the upper damper 26 is connected to the frame 15, and the lower damper 27 is
connected to the outer peripheral side center plate 11, The coil bobbin 24 is swingably
supported by the dampers 26 and 27 of FIG. Such a damper having dampers disposed above and
below the voice coil is referred to as a double damper structure. Such a double damper structure
is applied to a speaker unit using a relatively large diaphragm, and even if a large diaphragm is
used, the central axis of the coil bobbin is less likely to deviate from the central axis of the
speaker unit, and the coil bobbin is fixed. Have the effect of being maintained in
[0004]
According to the speaker unit configured as described above, the coil bobbin 24 vibrates
according to the drive signal (audio signal) supplied to the voice coil 25, the cone 21 vibrates by
the coil bobbin 24, and is supplied to the voice coil 25. The sound based on the voice signal is
reproduced.
[0005]
By the way, although the speaker unit of such a double damper structure has an effect that the
support state of the coil bobbin is maintained in a constant state and is good, a plurality of
diaphragms to which the coil bobbin is attached are used. There is a disadvantage that the
diaphragm is hard to vibrate because it is firmly supported at the place.
That is, the loudspeaker of the double damper structure has higher stiffness and higher minimum
resonance frequency than the loudspeaker of the same size of the single damper structure, and
the frequency characteristics of the loudspeaker deteriorate, and the upper damper There is a
possibility that a divided vibration may occur in which the vibration state of the portion 26 and
the vibration state of the portion of the lower side damper 27 are different, and when such
divided vibration occurs, the vibration characteristics of the diaphragm deteriorate. , The sound
to be reproduced is distorted.
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[0006]
In view of these points, the present invention has an object to provide a speaker unit in which
good characteristics are secured even with a double damper structure.
[0007]
According to the present invention, for example, as shown in FIG. 1, a frame 15, a diaphragm 20
having an edge 22 supported by the frame 15, and a coil bobbin 24 attached to the diaphragm
20. And a magnetic circuit 11 to 14 configured around the voice coil 25. By supplying a
predetermined signal to the voice coil 25, sound corresponding to the signal is reproduced. In the
speaker unit to be mounted, the dampers 26, 27 for supporting the coil bobbin 24 on the side of
the frame 15 or the magnetic circuits 11 to 14 are provided at two places, the upper part and the
lower part of the winding part of the voice coil 25, The edge 22 connecting the frame 15 is
formed of a soft material.
[0008]
In addition, rubber is used as the edge 22 in this case.
[0009]
Furthermore, in each case, a relatively hard adhesive is used to connect the upper damper 26 and
the coil bobbin 24 close to the diaphragm, and a relatively soft adhesive is used to connect the
lower damper 27 and the coil bobbin 24. The adhesive of the present invention is used.
[0010]
According to the present invention, since the edge 22 of the diaphragm is formed of a soft
material, the vibration state of the diaphragm is not restricted by the edge 22 and the minimum
resonance frequency of the speaker is lowered even in the double damper structure. Can.
[0011]
In this case, by using rubber as the edge 22, it is possible to easily form an edge of a soft
material.
[0012]
Also, a relatively hard adhesive is used to connect the upper damper 26 and the coil bobbin 24
close to the diaphragm, and a relatively soft adhesive is used to connect the lower damper 27
and the coil bobbin 24. By doing this, it is possible to prevent the occurrence of divided vibration
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on the coil bobbin side, the vibration state on the coil bobbin side becomes good, and a speaker
with a good double damper structure without distortion can be obtained.
[0013]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present
invention will be described below.
The present embodiment is applied to the speaker unit having the configuration shown in FIG. 1
described in the conventional example, and will be described with reference to FIG.
[0014]
The speaker unit of this example is a speaker unit having a double damper structure in which the
dampers 26 and 27 are disposed above and below the top plate 11 as shown in FIG.
The edge 22 is attached around the cone 21 constituting the diaphragm 20. In the case of this
example, rubber rubber is used as the edge 22.
Then, the periphery of the cone 21 is connected to the frame 15 through the edge 22 made of
rubber rubber.
[0015]
As a rubber rubber which comprises this edge 22, SBR, NBR, IIR (butyl rubber) etc. are used, for
example.
As a characteristic of this rubber rubber, a relatively soft rubber having a softness of 70 degrees
or less is used.
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[0016]
Further, in this example, the connection between the coil bobbin 24 and the upper and lower
dampers 26 and 27 is performed by an adhesive, and as the adhesive for connecting the upper
damper 26 and the coil bobbin 24, a hard adhesive having relatively high hardness is used. Use
For example, an epoxy resin adhesive is used.
[0017]
Then, as an adhesive for connecting the lower damper 27 and the coil bobbin 24, a soft adhesive
having a relatively low hardness is used.
For example, a soft epoxy resin adhesive is used.
[0018]
The adhesive used to bond the upper damper 26 and the adhesive used to bond the lower
damper 27 use the same epoxy resin adhesive, and in each case the main agent The mixing ratio
with the curing agent may be changed.
For example, when using an epoxy resin-based adhesive called EP-001 manufactured by
Cemedine and using it for adhesion of the upper damper 26, the mixing ratio of the main agent
and the curing agent is set to 1: 1. In the case of using for bonding of the lower damper 27, the
mixing ratio of the main agent and the curing agent may be 1: 0.6 to lower the hardness.
[0019]
The other parts are configured in the same manner as the conventional double damper speaker
unit.
[0020]
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According to the speaker unit of this example configured in this way, it operates as a speaker
with good characteristics.
That is, since the edge 22 of the diaphragm is formed of relatively soft rubber rubber, the
support state around the diaphragm becomes good, and the vibration state of the diaphragm is
not regulated by the edge 22, and the two places of the coil bobbin 24 are Although the double
damper structure is connected to the dampers 26 and 27, the lowest resonance frequency as the
speaker unit can be lowered, and the frequency characteristic of the speaker unit becomes good.
[0021]
Also, a relatively hard adhesive is used to connect the upper damper 26 and the coil bobbin 24
close to the diaphragm, and a relatively soft adhesive is used to connect the lower damper 27
and the coil bobbin 24. By doing this, it is possible to prevent the occurrence of divided vibration
on the coil bobbin side, the vibration state on the coil bobbin side becomes good, and a speaker
with a good double damper structure without distortion can be obtained.
[0022]
In the above-described embodiment, rubber rubber is used as the edge of the diaphragm, but it
may be made of other soft material that can obtain similar characteristics.
Moreover, the adhesive used for connection of a coil bobbin and a damper is not limited to what
was shown in the above-mentioned Example, if it is the thing of the same hardness.
[0023]
According to the present invention, since the edge of the diaphragm is made of a soft material,
the vibration state of the diaphragm is not restricted by the edge, and the minimum resonance
frequency of the speaker is lowered even in the double damper structure. And the frequency
characteristics of the double damper speaker can be improved.
[0024]
In this case, by using rubber as the edge, an edge of a soft material can be easily formed, and a
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speaker with good characteristics can be easily manufactured.
[0025]
Also, by using a relatively hard adhesive to connect the upper damper and the coil bobbin close
to the diaphragm, and using a relatively soft adhesive to connect the lower damper and the coil
bobbin, It is possible to prevent the occurrence of split vibration on the coil bobbin side and the
like, and the vibration state on the coil bobbin side is also good, and a speaker having a good
double damper structure without distortion is obtained.
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