JPH06253381

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DESCRIPTION JPH06253381
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
box type speaker for use in an audio apparatus or the like.
[0002]
2. Description of the Related Art FIG. 8 is a cross-sectional view and a perspective view of a
conventional speaker unit, and FIG. 9 is a cross-sectional view showing a structure of a
conventional box-type speaker. In the conventional speaker unit, as shown in FIG. 8, the inner
end of a metal frame 81 is fixed to a yoke 83 constituting a magnetic circuit, a diaphragm 82 and
an edge 84 are attached to a flange portion 85 of the frame 81. It has a structure that is fixed by
bonding.
[0003]
Then, as shown in FIG. 9, the speaker unit is inserted from the opening of the speaker box 91,
and the flange portion 85 of the frame 81 is fixed to the speaker box 91 with a screw 92 to
complete a box type speaker.
[0004]
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Since the diaphragm 82 is weak in mechanical strength, as shown in FIG. 8A, the outer periphery
of the diaphragm 82 is connected to the edge 84 of the flange portion 85 of the frame 81 made
of metal. Fixing it contributes to supporting the entire diaphragm 82 so that the diaphragm 82
reproduces sound efficiently.
Further, as shown in FIG. 9, the magnetic circuit unit 86 is attached to and supported by the
speaker box 91 via a metal frame 81.
[0005]
However, as shown in FIG. 8 (b), although the frame 81 is formed using a considerable metallic
material so as to cover the entire diaphragm 82 from the back, it has a speaker function that
reproduces sound from electrical signals Not as contributing.
[0006]
Incidentally, even in the case of a car-mounted box type speaker, it is desirable that the car be
lightweight even in order to reduce the fuel consumption of the vehicle.
In addition, in a box type speaker other than for car use, it is desirable to reduce the number of
parts from the viewpoint of cost reduction and weight reduction. Furthermore, in recent years,
material saving is strongly desired not only from the economical point of view of cost reduction
but also from the point of view of effective utilization of limited resources.
[0007]
When such a situation is taken into consideration, although the frame of the conventional
speaker unit as described above uses a large amount of metal material to support the heavy
magnetic circuit portion, it directly contributes to the reproduction of sound. Since it does not,
improvement is desired.
[0008]
The technical problem of the present invention focuses on such problems, and improves the
structure of the box type speaker to save the metal material and realize cost reduction, weight
reduction and material saving. It is.
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[0009]
FIG. 1 is a cross-sectional view, a perspective view and a partially broken perspective view
showing a first embodiment of a box type loudspeaker according to the present invention.
The box type speaker according to claim 1 incorporates the speaker unit 1 having a structure
without a frame on the back of the diaphragm 3 as shown in FIG. 1 in the speaker box 2, and the
edge 4 of the diaphragm 3 of the speaker unit 1 It is attached to the edge of the opening of the
speaker box 2, and the magnetic circuit portion 5 side of the speaker unit 1 is fixed to the inner
wall of the speaker box 2.
[0010]
The box-type speaker according to claim 2 has a structure in which the magnetic circuit unit 5 of
the speaker unit 1 is fixed to the inner wall of the speaker box 2 via a support as illustrated in
FIGS. 3 to 5. ing.
[0011]
In the box type speaker according to claim 1, the magnetic circuit portion 5 side of the speaker
unit 1 is fixed to the inner wall of the speaker box 2, and the edge 4 of the diaphragm 3 of the
speaker unit 1 is the same as that of the speaker box 2. Since it is fixed to the edge of the
opening, the speaker box 2 supports the outer peripheral side of the diaphragm 3 of the speaker
unit 1 instead of the conventional speaker frame.
Further, the heavy magnetic circuit portion is directly supported on the inner surface of the
speaker box.
[0012]
Therefore, according to the present invention, the speaker frame for supporting the diaphragm
and the magnetic circuit unit of the speaker unit becomes unnecessary, and the cost reduction by
the reduction of the metal material and the fuel consumption reduction by the weight reduction
are realized.
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[0013]
In the box-type speaker according to claim 2, the magnetic circuit portion 5 of the speaker unit 1
is fixed to the inner wall of the speaker box 2 with the support base in between, so the depth of
the speaker box is wider than the depth of the speaker unit The resonant space (back cavity) can
be expanded to provide better sound reproduction.
[0014]
Next, how the box-type loudspeaker according to the present invention is embodied in practice
will be described by way of examples.
FIG. 1 is a cross-sectional view, a perspective view and a partially broken perspective view for
explaining a first embodiment of the present invention, and FIG. 2 is a cross-sectional view and a
perspective view of a speaker unit having no speaker frame according to the present invention. .
[0015]
As shown in FIG. 2, the support plate 23 is for supporting the damper 22 so that the voice coil 26
for driving the diaphragm 21 vibrates stably, and in the structure without the damper 22, the
support plate 23 is also unnecessary.
Further, it goes without saying that a frame which supports the diaphragm 21 by covering the
back surface of the diaphragm 21 as in the prior art is also unnecessary.
Then, the magnetic circuit unit 5 including the magnet 24 and the yoke 25 is fixed to the speaker
box 2 by adhesion, screwing, or the like.
[0016]
As described above, the speaker unit 1 having no frame at the back of the diaphragm is fixed in
the speaker box 2 shown in FIG. That is, the magnetic circuit unit 5 of the speaker unit 1 is fixed
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to the inner wall of the speaker box 2, and the edge 4 of the diaphragm 3 of the speaker unit 1 is
fixed to the edge of the opening of the speaker box 2.
[0017]
As described above, since the magnetic circuit unit 5 and the edge 4 of the diaphragm 3 are
separately fixed to the speaker box 2, the diaphragm 3 is supported by the speaker box 2. Since
there is no frame that inhibits air vibration between the back surface and the back cavity of the
speaker, a faithful reproduced sound can be obtained.
[0018]
Since the edge 4 of the diaphragm 3 protrudes further than the front surface of the speaker box
2, it is preferable to attach a protective member 6 higher than the edge 4 around the edge 4 so
as not to crush the edge 4 due to contact or the like. .
[0019]
Since the heavy magnetic circuit portion is directly attached and fixed to the inner surface of the
speaker box, the entire load of the speaker unit does not concentrate on the opening edge of the
speaker box as in the prior art.
As a material of the speaker box 2, it is preferable to use a resin if it is for use in a car.
When the speaker box 2 is formed of resin, at present, since the box type as shown in FIG. 1 can
not be formed at one time, for example, those divided at the side are integrally joined by
vibration welding or the like.
[0020]
FIG. 3 is a cross-sectional view for explaining a second embodiment of the present invention. In
the structure of the first embodiment, the depth of the speaker box is determined by the depth of
the speaker unit, so there is a limit to widening the resonance space of the speaker box.
Therefore, in this embodiment, a separate support base 33 is bonded and fixed to the inner wall
of the speaker box 32, and the magnetic circuit side of the speaker unit 31 is bonded and fixed to
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the support base 33.
[0021]
With such a structure, it is possible to increase the depth of the speaker box 32 by increasing the
height of the support base 33. As a result, the resonance space of the speaker box 32 becomes
wider, and the sound quality can be improved. FIGS. 3 (b) to 3 (e) are perspective views showing
various embodiments of the support base 33. As shown in FIG. 3 (b), the support base 33 is
joined to the magnetic circuit portion of the speaker unit as much as possible. It is preferable that
the surface is wide.
[0022]
However, if it is desired to reduce the weight or the material used, it is also possible to reduce the
diameter as shown in (c) in the figure or to provide a cavity as in (d) in the figure. When the
speaker unit 32 is made of wood or the like, the materials can be effectively utilized by making
each cylindrical structure as shown in FIG.
[0023]
FIG. 4 is a cross-sectional view for explaining the third embodiment of the present invention, and
shows another means for securing a wide resonance space of the speaker box. In the case where
the speaker box is formed of resin, since the shape can be relatively freely formed, as shown in
the figure, the support can be integrally molded with the speaker box.
[0024]
That is, the support base 33 in FIG. 3 (a) is integrally molded inside the speaker box as shown in
FIG. 4 (a). Alternatively, as shown in FIG. 4B, the thickness of the speaker box is constant, and the
back wall of the speaker box is formed to be convex toward the inside. With such a structure, it is
possible to increase the depth of the speaker box and widen the resonance space by increasing
the heights of the convex portions 33a and 33b integrally formed with the speaker box.
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[0025]
FIG. 5 is a cross-sectional view for explaining a fourth embodiment of the present invention. In
order to bond and fix the magnetic circuit part side of the speaker unit, it is necessary to pay
attention to the bonding position, bonding time and the like, and the operation is complicated. On
the other hand, as shown in FIG. 2, screw holes 28 are opened in the back of the magnetic circuit
portion of the speaker unit, and the speaker unit is screwed and fixed to the speaker box as
shown in FIG.
[0026]
With such a structure, the fixing position of the speaker unit is determined by the position of the
screw hole, and bonding time and the like are not necessary, and the fixing operation becomes
easy. When using a separate support base 33, as shown in FIG. 5C, the support base 33 is
sandwiched and screwed.
[0027]
FIG. 6 is a front view and a side view for explaining a fifth embodiment of the present invention.
As shown in FIG. 6A, a member having a protrusion 61 on the outer surface and a member
having a recess 63 in the vertical direction and an inner groove 62 continuous with the recess 63
as shown in FIG. Form a bayonet bond. Now, after the projection 61 is inserted into the groove
63 and the member 64 is turned to the right, the projection 61 slides into the inner groove 62
and is locked to each other as shown in FIG.
[0028]
If one of such bayonet couplings is provided on the magnetic circuit side of the speaker unit and
the other is fixed in advance to the inner wall of the speaker box, no tool is required for the fixing
operation of the speaker unit, and the operation is easy. Become. When the speaker box is
formed of resin, it is also possible to integrally form the bayonet coupling projections and
grooves with the speaker box.
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[0029]
FIG. 7 is a cross-sectional view for explaining a sixth embodiment of the present invention. In the
case of the present invention, since the speaker frame is not present, when the external pressure
is applied to the speaker box to deform it, the diaphragm 21 of the speaker unit may be
damaged. However, as in this embodiment, by providing the support 71 between the front and
the back in the speaker box 32, the speaker box is prevented from being deformed by the
external pressure and the diaphragm 21 of the speaker unit is prevented from being damaged.
can do. Further, since the strength of the speaker box is enhanced by the support 71, it is
possible to reduce the thickness of the speaker box and save materials.
[0030]
According to the box type speaker of the present invention, the magnetic circuit side of the
speaker unit is fixed to the inner wall of the speaker box, and the edge of the diaphragm is fixed
to the opening edge of the speaker box. Unlike the prior art, in the speaker unit, a frame for
supporting the diaphragm through the edge or for supporting the magnetic circuit unit on the
speaker box or the like is unnecessary.
[0031]
As a result, in the box type speaker, by saving the metal material used for the frame of the
speaker unit, it has become possible to realize cost saving and weight saving and fuel saving and
material saving of the vehicle.
[0032]
According to the second aspect of the present invention, by fixing the magnetic circuit side of the
speaker unit to the inner wall of the speaker box by sandwiching the support, the resonance
space is expanded, so that better sound reproduction can be performed. It becomes possible.
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