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JP2008278111

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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
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DESCRIPTION JP2008278111
The present invention provides a speaker whose sound pressure frequency characteristic is
weakened and the sound quality of the speaker is improved, and whose manufacturing cost is
low. A diaphragm 1 is used, which is formed in the shape of a rotating body and in which a voice
coil disposed in a magnetic gap is fixed to an inner peripheral portion 1a and an outer peripheral
portion 1b is fixed to a frame via an edge. Two tinsel cords for transmitting an audio signal to the
coil were fixed at mutually different positions 1c and 1c from the center of the diaphragm.
[Selected figure] Figure 1
スピーカ
[0001]
The present invention relates to a speaker, and more particularly to a diaphragm thereof.
[0002]
An example of a conventional speaker diaphragm will be described with reference to FIGS. 3 and
4.
FIG. 3 is a plan view showing an example of a diaphragm used in a conventional speaker, and
FIG. 4 is a partial cross-sectional view showing the same speaker. The diaphragm 4 shown in the
figure has a cone shape, and the voice coil 2 is fixed to the inner peripheral portion 4a by
adhesion.
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1
[0003]
The outer peripheral portion 4b of the diaphragm 4 is fixed to the frame via the edge described
in FIG. The winding of the voice coil 2 is disposed in the magnetic gap, and both ends of the
winding are connected to the tinsel wire fixing positions 4c, 4c by strip conductors 4d, 4d
attached to the back of the diaphragm 4. The tinsel wires 3, 3 soldered to the tinsel wire fixing
positions 4c, 4c are connected to the terminals of the terminal plate fixed to the frame through
the space.
[0004]
Thus, when an audio signal is transmitted to the winding of the voice coil 2 disposed in the
magnetic gap through the tinsel wires 3 and 3, the voice coil 2 vibrates up and down as shown
by the arrow in FIG. Sound is generated by vibrating the diaphragm 4.
[0005]
In the above-described diaphragm 4, the two tinsel wire fixing positions 4c and 4c are arranged
at equal distances from the center of the diaphragm.
Since the tinsel wire fixing positions 4c, 4c support the weight of the solder or tinsel wire, the
weight is larger than other parts, but since the positions are equidistant from the center of the
diaphragm, the division vibration is dispersed. There is no effect.
[0006]
Therefore, as shown by a dotted line in FIG. 4, a standing wave of divided vibration of the same
wavelength is generated in the circumferential direction. At the resonance frequency of this
divided vibration, a strong sound pressure peak occurs, and the frequency characteristic is not
flat, and the sound quality of the speaker is degraded.
[0007]
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2
An example of the speaker disclosed in Japanese Patent Laid-Open No. 10-126881 will be
described with reference to FIG. The diaphragm 9 of the speaker is asymmetric with respect to all
axes orthogonal to the central axis of the voice coil 2 fixed to the inner peripheral portion, and
mass balance is made so that the center of gravity is located at the center of the voice coil 2
Adjustment is made by impregnating the plate thickness or the diaphragm reinforcement.
[0008]
The outer peripheral portion of the diaphragm 9 is fixed to the frame 7 via the edge 10. The
winding of the voice coil 2 is disposed in the magnetic gap 6 of the magnetic circuit 5 fixed to the
frame 7, and both ends of the winding are connected to the tinsel wire fixing position by a strip
conductor (not shown) attached to the back of the diaphragm 9. It is done. An unshown notshown tinsel wire soldered to the tinsel wire fixing position is connected to the terminal of the
terminal board fixed to the frame through the space.
[0009]
A damper 8 whose inner periphery is adhered to the voice coil 2 and whose outer periphery is
fixed to the frame 7 keeps the position of the winding of the voice coil 2 in the magnetic gap 6. A
dust cap 11 fixed to the top of the voice coil 2 prevents dust from entering the magnetic gap 6.
[0010]
As described above, when the voice signal is transmitted to the winding of the voice coil 2
disposed in the magnetic gap 6 through the tinsel wire, the voice coil 2 vibrates up and down to
vibrate the diaphragm 9 to generate sound. Do.
[0011]
Since the diaphragm 9 of this speaker is asymmetric in shape and mass at positions equidistant
from the center of the voice coil 2, the wavelength of the standing wave of the divided vibration
is different in the circumferential direction, and the peak in the sound pressure frequency
characteristic is weakened. And the sound quality of the speaker is improved.
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However, since the diaphragm, the frame, and the like are not rotating bodies, a dedicated mold
is required, and furthermore, the material of the diaphragm is also nonuniform, and there is a
problem that the manufacturing cost increases.
[0012]
An example of the speaker disclosed in JP-A-2002-374594 will be described with reference to
FIG. The speaker diaphragm 12 shown in FIG. 6A is provided with convex portions 12a, 12a...
Which are radially arranged from the vicinity of the center and formed by ribs.
[0013]
The speaker diaphragm 13 shown in FIG. 6 (b) has ridge lines 13a, 13a... And groove lines 13b,
13b formed at equal intervals in the circumferential direction, and between the ridge lines 13s
and groove line 13b is a screw propeller shaped inclined portion 13c It has become.
[0014]
Since the speaker diaphragms shown in FIGS. 6A and 6B have different rigidity in the
circumferential direction, the wavelength of the standing wave of the divided vibration is
different in the circumferential direction, and the peak in the sound pressure frequency
characteristic is weakened. The sound quality of the speaker is improved.
However, since ribs and deformed portions are provided on the diaphragm, there has been a
problem that the cost of molding and molding increases. JP-A-10-126881, paragraph 0009 to
0010, FIG. 2 JP-A-2002-374594, paragraph 0002, paragraph 0012 to paragraph 0016, FIGS.
[0015]
The present invention has been made in view of the above-described point, and an object of the
present invention is to provide a speaker whose sound pressure frequency characteristic is
weakened and sound quality of the speaker is improved, and whose manufacturing cost is low. It
is in.
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4
[0016]
In the loudspeaker according to the present invention, a diaphragm is used, which is formed in
the shape of a rotating body and in which the voice coil disposed in the magnetic gap is fixed to
the inner circumferential portion and the outer circumferential portion is fixed to the frame via
an edge. The two tinsel cords for transmitting voice signals are fixed at mutually different
positions from the center of the diaphragm.
[0017]
According to the speaker of the present invention, since the positions for fixing the two tinsel
cords of the diaphragm are at different positions from the center, the weight balance of the
diaphragm becomes uneven in the radial direction, the split resonance is dispersed, and the
sound pressure The peak of becomes weak and the frequency characteristic approaches flat.
Moreover, this does not increase the cost.
[0018]
Hereinafter, the best mode for carrying out the present invention will be described according to
an embodiment.
FIG. 1 is a plan view showing a diaphragm used in a speaker according to an embodiment of the
present invention, and FIG. 2 is a partial cross-sectional view showing the same speaker.
[0019]
The diaphragm 1 shown in the figure has a cone shape, and the voice coil 2 is fixed to the inner
peripheral portion 1a by adhesion. The outer peripheral portion 1b of the diaphragm 1 is fixed to
the frame via the edge described in FIG. The winding of the voice coil 2 is disposed in the
magnetic gap, and both ends of the winding are connected to the tinsel wire fixing positions 1c,
1c by strip conductors 1d, 1d attached to the back of the diaphragm 1. The tinsel wires 3, 3
soldered to the tinsel wire fixing positions 1c, 1c are connected to the terminals of the terminal
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5
plate fixed to the frame through the space.
[0020]
Thus, when an audio signal is transmitted to the winding of the voice coil 2 disposed in the
magnetic gap through the tinsel wires 3 and 3, the voice coil 2 vibrates up and down as shown
by the arrows in FIG. Sound is generated by vibrating the diaphragm 1.
[0021]
In the above-described diaphragm 1, the two tinsel wire fixing positions 1c, 1c are arranged at
different distances from the center of the diaphragm.
Since the tinsel wire fixing positions 1c, 1c support the weight of the solder or tinsel wire, the
weight is larger than the other parts, but the division vibration is dispersed because the positions
are different distances from the center of the diaphragm. . Moreover, since the tinsel wire fixing
positions 1c, 1c have high rigidity, they tend to be nodes of standing waves.
[0022]
Therefore, as shown by dotted lines in FIG. 2, the divided vibration is a standing wave of different
wavelengths in the circumferential direction. At the resonance frequency of the divided vibration,
the divided vibration is weakened, the sound quality of the speaker is improved, and the
manufacturing cost is the same as that of the conventional speaker described in FIG. 3 and FIG.
[0023]
The embodiment is configured as described above, but the invention is not limited thereto. For
example, the shape of the diaphragm is not limited to a cone (conical shape), and may be a
trumpet shape with a high height.
[0024]
It is a top view which shows the diaphragm used for the speaker which is an Example of this
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invention.
It is a fragmentary sectional view showing the speaker. It is a top view which shows the example
of the diaphragm used for the conventional speaker. It is a fragmentary sectional view showing
the speaker. It is sectional drawing which shows the other example of the conventional speaker.
It is a top view which shows the other example of the diaphragm used for the conventional
speaker.
Explanation of sign
[0025]
Reference Signs List 1 diaphragm, 1a inner circumferential portion, 1b outer circumferential
portion, 1c tinsel wire fixing position, 1d strip conductor 2 voice coil 3 tinsel wire 4 diaphragm,
4a inner circumferential portion 4b outer circumferential portion, 4c tinsel thread fixing position,
4d strip conductor Reference Signs List 5 magnetic circuit 6 magnetic gap 7 frame 8 damper 9
diaphragm 10 edge 11 dust cap 12 diaphragm 12a convex portion 13 diaphragm 13a ridge line
13b groove line 13c inclined portion
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