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DESCRIPTION JPH11168796

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DESCRIPTION JPH11168796
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used in various audio equipment.
[0002]
2. Description of the Related Art A conventional loudspeaker will be described with reference to
the loudspeaker of elongated structure shown in FIGS.
[0003]
FIG. 4 is a top view of a conventional elongated speaker, FIG. 5 is a side sectional view in the
same major axis direction, and FIG. 6 is a side sectional view in the same minor axis direction.
[0004]
As shown in the figure, reference numeral 1e is a slender diaphragm that generates air vibration,
and the outer peripheral part of the diaphragm 1e is held by the frame 11e via an edge 3e.
[0005]
A voice coil bobbin 6e is fixed to an intermediate portion of the diaphragm 1e, and the coil
bobbin 6e is vibratably supported by a frame 11e via a damper 4.
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[0006]
On the other hand, a magnetic circuit 26 comprising an upper plate 8e, a magnet 9e and a lower
plate 10e is provided in the central recess of the frame 11e, and a wire coil for voice coil wound
around a voice coil bobbin 6e in the magnetic gap of the magnetic circuit 26. The voice coil
bobbin 6e is moved in a piston by the drive current flowing therethrough, and the diaphragm 1e
coupled to the voice coil bobbin 6e vibrates to emit a sound wave.
[0007]
FIG. 7 is a force / displacement characteristic diagram of the damper 4.
[0008]
However, in the above-mentioned speaker, 1.
Since the damper 4 is made of a cloth material, it is heavy and causes a decrease in sound
pressure, and surface resonance is easily generated at the time of the amplitude of the
diaphragm 1 e. And cause deterioration of sound pressure.
2.
The damper 4 needs to be reduced in radius of curvature and width so as to be contained inside
the frame 11e. As a result, the stiffness of the vibration system is increased, the minimum
frequency f0 is increased, and reproduction of the low frequency range becomes difficult.
Had the task of
[0009]
The present invention solves the above-mentioned problems, and it is difficult to cause split
resonance even though it has a slender structure, and flat frequency characteristics are obtained,
and the sound quality is made possible to reproduce the bass region by suppressing the lowest
resonance frequency f0 low. It provides an excellent speaker.
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[0010]
SUMMARY OF THE INVENTION In order to solve the above problems, the speaker of the present
invention has an outer periphery coupled to at least a voice coil embedded in a magnetic gap of a
magnetic circuit and a frame coupled to the magnetic circuit. The diaphragm comprises: a
diaphragm coupled to the voice coil; and a damper formed of a plurality of corrugated or Sshaped resin wires coupled to the voice coil and the frame to support the voice coil. While
reducing the difference in variation due to upward and downward force acting on the damper to
reduce non-linear distortion at the time of large amplitude to improve the sound quality, the
weight reduction of the damper can be achieved, and the sound pressure can be increased.
Various characteristics can be improved.
[0011]
According to a first aspect of the present invention, an outer periphery is coupled to at least a
voice coil embedded in a magnetic gap of a magnetic circuit, and a frame coupled to the magnetic
circuit, and an inner periphery is connected to the frame. It is composed of a diaphragm coupled
to a voice coil, a damper formed of a plurality of corrugated or S-shaped resin wires coupled to
the voice coil and the frame to support the voice coil. The difference in variation due to the
upward force and downward force is reduced to reduce non-linear distortion at the time of large
amplitude to improve the sound quality, to reduce the weight of the damper, to increase the
sound pressure, and to achieve surface resonance by adoption of resin wire. Of the speaker, the
peak dip of the frequency in the middle and high frequency range of the speaker, the stiffness of
the vibration system is reduced and the resonance frequency (f0) of the speaker is lowered. It is
those that can be achieved.
[0012]
According to the second aspect of the present invention, the resin wire according to the first
aspect is punched out of the resin film to form a damper, and the characteristics of the resin wire
can be determined by the thickness and the punching width of the resin film. Desired properties
can be obtained very efficiently.
[0013]
In the invention according to claim 3, ends of at least a plurality of resin wires are connected at
either the connection with the voice coil or the connection with the frame, and a contact area at
the connection is secured. It is intended to improve the adhesive strength.
[0014]
Hereinafter, an embodiment of a speaker according to the present invention will be described
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with reference to FIGS. 1 to 3.
[0015]
(First Embodiment) FIG. 1 is a side sectional view of a speaker according to an embodiment of the
present invention, and FIG. 2 (a) is a top view of a damper which is the same as the main part,
FIG. Is a half sectional side view of the same, and FIG. 3 is a characteristic view of force and
displacement.
[0016]
According to the figure, reference numeral 1 denotes a diaphragm having an edge 2 on the nonaxisymmetric outer periphery having a major axis and a minor axis, the outer periphery of the
edge 2 is adhesively fixed to the frame 9, and the diaphragm 1 is a frame 9 is held.
[0017]
A magnetic circuit 10 is disposed on the bottom of the frame 9 in the frame consisting of an
upper plate 7a, a magnet 8 and a lower plate 7b. A damper 6 made of a corrugated resin wire is
suspended on the bottom of the frame 9 by adhesion. It is fixed.
[0018]
A voice coil 3 is coupled to the diaphragm 1, and a voice coil winding 4 is wound around a
portion inserted into the magnetic gap, and is coupled to a central portion of the wave-shaped
damper 6 There is.
[0019]
More specifically, the resin wire damper 6 radially extends from the joint portion 6a with the
voice coil 3 to form a joint portion 6b with the frame 9, and the resin wire portion 6c is
integrated by the joint portions 6a and 6b. The bonding area between the voice coil 3 and the
frame 9 is increased by the connecting portions 6a and 6b to improve the bonding strength.
[0020]
In the above embodiment, although the damper 6 has a wave shape, it may have an S shape, and
in any shape, the displacement of the movement of the damper 6 with respect to the vertical
movement of the voice coil 3 does not differ from the vertical movement. The weight reduction
can be achieved by using a resin wire.
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[0021]
Further, the damper 6 can be obtained extremely easily by punching after forming the resin film
into a predetermined shape of S-shape or waveform and with good productivity, and by setting
the thickness of the resin film used and the punching width appropriately Adjustments can also
be made freely.
[0022]
In addition, it is desirable for the joint 6b to have a larger contact area than the joint 6a, and for
the joint 6a, the sound pressure of the speaker is increased if the joint 6a is kept at the minimum
for obtaining the adhesive strength with the voice coil 3. In order to keep the shape of the
damper 6 in shape, it is preferable that the size of the joint 6 b be as large as possible without
affecting the characteristics of the damper 6.
[0023]
FIG. 3 shows the force-displacement characteristics of the damper 6 in the above embodiment,
and it has been confirmed that the linearity is improved as compared with the conventional one
of FIG.
[0024]
As described above, the loudspeaker according to the present invention comprises the damper
made of a plurality of corrugated or S-shaped resin wires, and reduces the difference in variation
due to the upward and downward forces acting on the damper. While reducing non-linear
distortion at the time of large amplitude and improving sound quality, it is possible to reduce the
weight of the damper and to provide a speaker with various characteristics improved such as
increasing sound pressure.
[0025]
Brief description of the drawings
[0026]
1 is a side sectional view of an embodiment of the speaker of the present invention
[0027]
Fig. 2 (a) Top view of the damper which is the main part
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[0028]
Fig. 3 Force-displacement characteristics of the same damper
[0029]
Fig. 4 Top view of the conventional speaker
[0030]
Fig. 5 Side cross-sectional view of same major axis direction
[0031]
Fig. 6 Side cross-sectional view of same minor axis direction
[0032]
Fig. 7 Force-displacement characteristic of the damper
[0033]
Explanation of sign
[0034]
1 diaphragm 3 voice coil 6 damper 9 frame 10 magnetic circuit
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