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JPH1155779

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH1155779
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker apparatus suitable for application to a small speaker apparatus.
[0002]
2. Description of the Related Art Conventionally, a dynamic speaker device as shown in FIG. 4 has
been proposed as a small-sized speaker device. Referring to FIG. 4, in FIG. 4, 1 is made of a
magnetic material and has a cylindrical center pole 1a embedded in a disc-like central portion,
and concentrically surrounds the center pole 1a. The yoke which made the cross section reverse
T character shape and which made the magnet guide 1b in which the step was formed united
was made into an inside diameter is fitted and joined to magnet guide 1b of this yoke 1, and it is
ring shape in thickness direction A magnet 2 magnetized is provided, and a ring-shaped plate 3 is
provided on the upper surface of the magnet 2 by bonding with an adhesive or the like, and a
magnetic circuit is formed by the yoke 1, the magnet 2 and the plate 3.
[0003]
In this case, a voice coil is formed by forming a concentric magnetic gap 4 between the center
pole 1 a of the yoke 1 and the inner periphery of the plate 3 and winding the diaphragm 5 in the
magnetic gap 4. I will arrange 6a.
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[0004]
Further, a funnel-shaped frame 7 made of steel or the like is fixed on the plate 3.
An edge 8 is provided on an outer peripheral portion of the frame 7, and the outer peripheral
portion of the conical diaphragm 5 is held by the edge 8.
[0005]
On the other hand, the upper end portion of the voice coil bobbin 6 is attached to the inner
peripheral portion of the diaphragm 5, the voice coil 6a wound around the voice coil bobbin 6 is
inserted into the magnetic gap 4, and the diaphragm is used to Make 5 vibrate. A corrugated
concentric damper 9 is bonded between the upper end of the outer periphery of the voice coil
bobbin 6 and the bottom of the frame 7 with an adhesive or the like, and the damper 9 holds the
voice coil 6a in the magnetic gap 4 To do.
[0006]
A lead wire is drawn out from the voice coil 6a and connected to a terminal 11 provided on the
frame 7 through the tinsel wire 10, and an audio signal obtained at the terminal 11 is supplied to
the voice coil 6a. Further, a dustproof cap 12 is provided on the upper surface of the voice coil
bobbin 6.
[0007]
SUMMARY OF THE INVENTION In such a small speaker apparatus as shown in FIG. 4, there is
generally a disadvantage that the lowest resonance frequency is relatively high, and it is difficult
for bass to be emitted. In order to lower the lowest resonance frequency of the speaker device
with high sensitivity, it is necessary to make the edge 8 thinner. However, in the case of a small
speaker device, if the edge 8 is made thinner, the sound radiated from the front surface of the
cone type diaphragm 5 and this vibration Although the sound radiated from the back side of the
plate 5 is canceled and the lowest resonance frequency is lowered, there is a disadvantage that
the sound pressure of the speaker device is also lowered.
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[0008]
The present invention has been made in view of the above circumstances, and an object thereof
is to enable the low frequency reproduction band of a small speaker device to be favorably
expanded.
[0009]
SUMMARY OF THE INVENTION The speaker apparatus according to the present invention has
the inner peripheral portions of first and second diaphragms with different half apex angles fixed
to the outer periphery of a voice coil bobbin with a predetermined interval in the vibration
direction of the voice coil bobbin. It is a thing.
[0010]
According to the present invention, since the second diaphragm is provided outside the first
diaphragm, the effective mass of the vibration system becomes so heavy that the reproduction
band of the low frequency can be expanded by that amount, and the vibration system at this time
It is necessary to increase the allowable input of the voice coil, but the inner circumferences of
the first and second diaphragms are separated on the outer circumference of the voice coil
bobbin in the direction of vibration of this voice coil bobbin. Because the cross section of the joint
portion between the first and second diaphragms and the voice coil bobbin becomes triangular, it
becomes very strong against deformation, and against the rolling of the first and second
diaphragms. Become stronger.
[0011]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to FIG. 1, an
example of an embodiment of a loudspeaker system according to the invention will be described.
In FIG. 1, parts corresponding to FIG. 4 are given the same reference numerals.
[0012]
In FIG. 1, the yoke 1 is made of a magnetic material and has a cylindrical center pole 1a
embedded in a disk-like central portion, and a stepped portion is formed to surround the center
pole 1a concentrically. The magnet guide 1b is integrated into a cross-sectional reverse T-shape.
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[0013]
An inner diameter is fitted and joined to the magnet guide 1b of the yoke 1 to provide a ringshaped magnet 2 magnetized in the thickness direction, and the upper surface of the magnet 2 is
joined with an adhesive or the like to form a ring-shaped plate A magnetic circuit is formed by
the yoke 1, the magnet 2 and the plate 3.
[0014]
For example, a neodymium plastic magnet is used as the magnet 2.
The neodymium plastic magnet is stronger in magnetism than the ferrite magnet and can be
easily formed into any shape.
[0015]
In this case, a voice coil 6a is formed by forming a concentric magnetic gap 4 between the center
pole 1a of the yoke 1 and the inner periphery of the plate 3 and winding the diaphragm within
the magnetic gap 4 to vibrate the diaphragm. As if
[0016]
Further, a funnel-shaped frame 7 made of steel or the like is fixed on the plate 3.
The outer peripheral portion of the cone-shaped diaphragm 20 with the edge 8 is adhered and
fixed to the flange portion of the outer periphery of the frame 7 through the gasket 13.
[0017]
On the other hand, the inner periphery of the diaphragm 20 is fixed to the middle of the outer
periphery of the voice coil bobbin 6 with an adhesive or the like, and the voice coil 6a wound
around the lower end of the voice coil bobbin 6 is inserted into the magnetic gap 4. The
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diaphragm 20 is vibrated by the voice coil 6a.
In this case, the half apex angle of the diaphragm 20 is θ0.
[0018]
In this example, the inner peripheral portion of the cone-shaped diaphragm 21 is attached to the
upper end portion of the outer periphery of the voice coil bobbin 6 which is separated from the
middle portion of the voice coil bobbin 6 by a predetermined interval I0 in the vibration direction
Fix by
In this case, the half apex angle θ1 of the diaphragm 21 is larger than the half apex angle θ0 of
the diaphragm 20 (the depth of the cone is shallow).
[0019]
In this embodiment, the outer peripheral portion of the diaphragm 21 is adhered and fixed to the
middle portion of the diaphragm 20.
In this case, the cross section of the joint portion between the diaphragms 20 and 21 and the
voice coil bobbin 6 is triangular as shown in FIG. 1 and is very resistant to deformation.
[0020]
In this case, the effective mass of the vibration system is the original effective mass m0 plus the
effective mass m1 of the diaphragm 21 (m0 + m1).
[0021]
A corrugated concentric damper 9 is bonded with an adhesive or the like between the lower side
of the fixed portion of the inner peripheral portion of the diaphragm 20 at the middle portion of
the outer periphery of the voice coil bobbin 6 and the bottom outer peripheral portion of the
frame 7 The voice coil 6 a is held in the magnetic gap 4 in cooperation with the damper 9 and
the diaphragms 20 and 21.
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[0022]
A lead wire is drawn from the voice coil 6a and connected to a terminal 11 provided on the
frame 7 through a tinsel wire 10, and an audio signal obtained at the terminal 11 is supplied to
the voice coil 6a.
Further, a dustproof cap 12 is provided on the upper surface of the voice coil bobbin 6.
In this case, the dustproof cap 12 may be formed integrally with the diaphragm 21.
[0023]
In this example, since the diaphragm 21 is provided outside the original diaphragm 20 as
described above, the effective mass is obtained by adding the effective mass m1 of the
diaphragm 21 to the effective mass m0 of the original oscillation system (m0 + m1) The lower
the frequency band, the wider the reproduction band.
[0024]
Incidentally, the lowest resonance frequency f0 of the speaker device can be expressed by:
Here, S0 is the stiffness of the support system.
[0025]
From this equation, it can be understood that the reproduction band of the low frequency band is
expanded by the effective mass of the diaphragm 21.
[0026]
In this case, since the effective mass of the vibration system of the speaker device becomes large,
it is necessary to increase the allowable input of the voice coil 6a. However, even if the allowable
input is increased, of the two diaphragms 20 and 21. Since the periphery is fixed to the outer
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periphery of the voice coil bobbin 6 at a predetermined interval I0 in the vibration direction of
the voice coil bobbin 6, the cross section of the connecting portion between the equalizing
diaphragms 20 and 21 and the voice coil bobbin 6 is triangular. It is very resistant to
deformation and has the advantage that the diaphragms 20 and 21 do not roll.
[0027]
Therefore, according to the present embodiment, there is an advantage that the low frequency
reproduction band of the small speaker device can be expanded favorably.
[0028]
FIG. 2 shows another example of the present invention. In this example of FIG. 2, the half apex
angle .theta.2 of the diaphragm 21 of the example of FIG.
Others are the same as in FIG.
[0029]
It can be easily understood that the same function and effect as the example of FIG. 1 can be
obtained also in the example of FIG. 2.
[0030]
FIG. 3 shows still another example of the present invention.
The parts corresponding to FIG. 1 will be assigned the same reference numerals and explanations
thereof will be omitted.
In this example shown in FIG. 3, the diaphragm 21 is a diaphragm with an edge 8a, and the outer
periphery of the diaphragm 21 is fixed to the flange portion of the outer periphery of the frame 7
together with the outer periphery of the diaphragm 20 with an adhesive etc. The shapes of the
edges 8 and 8a of the diaphragms 20 and 21 are completely reversed.
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Others are the same as in FIG.
[0031]
It can be easily understood that the same function and effect as the example of FIG. 1 can be
obtained in the example of FIG. 3 as well. Further, in the example of FIG. 3, the shapes of the
edges 8 and 8a of the two edged diaphragms 20 and 21 are made to be completely reverse
shapes, so that the non-linear distortion due to the edges 8 and 8a is reduced. There is.
[0032]
Although one damper 9 is used in the above-described example, it is of course possible to use
two dampers as a double damper.
[0033]
Further, it goes without saying that the present invention is not limited to the above-described
example and that various other configurations can be adopted without departing from the scope
of the present invention.
[0034]
According to the present invention, there is an advantage that the low frequency reproduction
band of the small speaker device can be expanded well.
[0035]
Brief description of the drawings
[0036]
1 is a cross-sectional view showing an example of the speaker apparatus of the present invention.
[0037]
2 is a cross-sectional view showing another example of the speaker device of the present
invention.
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[0038]
3 is a cross-sectional view showing another example of the speaker apparatus of the present
invention.
[0039]
4 is a cross-sectional view showing an example of a conventional speaker device.
[0040]
Explanation of sign
[0041]
1 .. Yoke, 1a ..: Center pole, 2 ... Magnet, 3 ... plate, 4 ... Magnetic gap, 6 ... Voice coil bobbin, 6a ..
Voice coil, 7 .. Frame, 8, 8a .. Edge , 9. ... Damper, 20, 21 ... ... diaphragm
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