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DESCRIPTION JPS5927698

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DESCRIPTION JPS5927698
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudspeaker in which the centering property of a damper for supporting a coil bobbin is
improved (and the nonlinearity of signal-sound pressure characteristics is reduced). [Background
Art and Problems Thereof] Usually, the speaker is connected to the frame 1 as shown in the
longitudinal sectional view shown in FIG. The yoke 4 provided with the pole piece 3 is attached,
and the voice coil 6 wound around one end of the coil bobbin 5 is inserted into the gap between
the pole piece 3 and the yoke 40, and the coil bobbin 5 is supported by the damper 7 on the
frame 1. The inner peripheral side 8 of the tumbler 1 is connected to the coil bobbin 5 and the
outer peripheral side 9 is connected to the frame 1, and between the inner peripheral side 8 and
the outer peripheral side 90, concentric corrugations 10 as shown in FIG. Is provided. Further,
the outer peripheral side of the cone 1217 whose inner peripheral side is attached to the other
end of the coil bobbin 5 is fixed to the frame 1 by the edge 13. When the speaker is configured
as described above, the damper 7 supporting the coil hobin 5 is coupled in a l plane
perpendicular to the axis of the coil hobin 5 '. It can not be said that it is good. Therefore, if the
rigidity of the damper 7 is increased by increasing the thickness of the damper 10 or by
impregnating a large amount of resin or the like into the substrate in order to improve the center
retention, the coil bobbin 5 reciprocates in the axial direction. Movement is constrained, which
reduces the efficiency of the speaker. Also, as shown in the operation explanatory view of the
damper 7 shown in FIG. 3, when the damper 1 is in the stationary state (actual ls), the state of
moving forward (dotted line) and the state of moving backward (dotted line) are compared. Then,
points A and B of the damper T are offset as indicated by arrows with respect to the
reciprocating motion of the coil bobbin 5, and the shape of the damper 7 is changed. Therefore,
cL) in which the center holding state of the coil bobbin 5 is changed by the damper 7 in the
above-mentioned customer condition, the structure of the damper 7 causes problems such as the
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5M causing the linearity of the signal-sound pressure characteristic of the speaker to be
impaired. There is a point. SUMMARY OF THE INVENTION The present invention has been made
in view of the above-mentioned point, and the damper which supports the coil bobbin has good
maintainability of the center, reduces non-linearity of the signal-sound pressure characteristic
and has the lowest resonance frequency. It provides a speaker that can be taken low. SUMMARY
OF THE INVENTION In order to achieve the above object, the present invention provides a
plurality of radial slits from the inner peripheral side to the outer peripheral side of the damper
to divide the damper, and the inner peripheral side of the damper divided into a plurality. Can be
coupled to the coil bobbin at different positions in the axial direction to improve the centering
property of the coil bobbin by the damper, reduce non-linearity of the signal-sound pressure
characteristic, and lower the lowest resonance and frequency. The
The present invention will be described below with reference to the drawings. FIG. 4 is a plan
view showing an example of a damper used in the speaker according to the present invention,
FIG. 5 is a cross-sectional view in which the inner peripheral side of the damper in FIG. The slits
from the outer circumference side to the outer circumference side 9-helical bobbin 50 are put
radially with respect to the 50 axis to divide the damper T into 12 equal parts. Other reference
numerals indicate the same parts as in FIG. In the speaker of the present invention, as shown in
FIG. 5, the inner peripheral side 8 of the damper 7 divided into a plurality by the slit 11 is joined
on the circumferential surface of the coil bobbin 50 at different positions in the axial direction.
ing. That is, since the damper 1 is coupled on the circumference of two planes perpendicular to
the axis of the coil bobbin 5, one damper 7 forms a double damper structure. For this reason,
even if an external force that tilts the axis of the coil bobbin 5 acts, it has a function of restoring
the coil bobbin 5 with a large moment, and the centering property of the fill bobbin 5 by the
damper T is improved. Further, since the slit 11 provided for dividing the damper 1 into a
plurality of wedges is opened in a wedge shape and the inner peripheral side 8 is connected to
the coil bobbin 5, the air resistance at the time of reciprocating movement of the damper 7 is
small. Becomes larger. Further, since the corrugations 10 are separated in the circumferential
direction by the radial slits 11, the reduction in compliance due to the expansion and contraction
in the circumferential direction of the fullgument 10 generated in the damper 7 when the fill
bobbin 5 reciprocates is the slits 11. Thus, the distortion due to the displacement of the damper
7 is reduced (and the lowest resonance frequency of the speaker can be lowered. FIG. 6 is a plan
view showing another example of the damper used for the speaker of the present invention, in
which the corrugation 10 between the slits 11 is made linear. If the fullgument 10 between the
slits 11 of the damper 1 is made linear as shown in FIG. 6, the expansion and contraction in the
circumferential direction of the corrugation 10σ is further eliminated. Therefore, the compliance
in the axial direction of the coil bobbin 5 in FIG. The number of slits 11 is not limited to 12 as
shown in the above embodiment, and may be appropriately set to n in consideration of the
rigidity of the damper γ and the minimum resonance frequency of the speaker, respectively. The
angle may be an equal angle to the ball. Further, the plane connecting the coil bobbin 5 and the
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inner circumferential side 8 is not limited to two planes, and may be, for example, three planes.
As described above, in the loudspeaker according to the present invention, the damper is divided
from the inner peripheral side to the outer peripheral side by a plurality of radial slins) K, and the
inner peripheral side of the divided damper is divided into coil bobbins Since the axial positions
are different and coupled and supported, the centering property of the coil bobbin is improved.
Further, the compliance in the circumferential direction of the damper and the compliance at the
time of reciprocation of the damper are increased to reduce distortion due to the displacement of
the damper, and there is an advantage that the minimum resonance frequency of the speaker can
be lowered.
[0002]
Brief description of the drawings
[0003]
1 is a longitudinal sectional view of a conventional speaker, FIG. 2 is a plan view of a damper
used for the speaker of FIG. 1, FIG. 3 is an operation explanatory view of the damper of FIG. 2,
and FIG. FIG. 5 is a plan view showing an example of a damper used for a speaker, FIG. 5 is a
sectional view of the example of the inner periphery of the damper of FIG. 4 coupled to a coil
bobbin, and FIG. 6 another example of the damper used for the speaker of the present invention.
It is a top view shown.
In the figure, 1 is a frame, 5 is a coil bobbin, T is a damper, 8 is an inner circumferential side, 9 is
an outer circumferential side, 10 is a corrugation, and 11 is a slit. Fig. 1 d Yeast, Fig. 4 Fig. 5 Fig.
6
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