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JPH0795686

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH0795686
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker unit to which an acoustic signal (audio signal) is supplied to reproduce sound.
[0002]
2. Description of the Related Art As a cone type speaker unit for reproducing music or the like,
there is one which is conventionally constructed as shown in FIG. In FIG. 7, 11 denotes an outer
peripheral side center plate, 12 a bottom plate, 13 a magnet, and 14 an inner peripheral side
center plate. The outer peripheral side center plate 11, the bottom plate 12, the magnets 13 and
the inner peripheral center plate 14 The magnetic circuit is configured by the above, and the
magnet 13 is disposed on the inner peripheral side. A through hole is formed in the central
portion of the magnet 13 on the inner peripheral side, the bottom plate 12 and the inner
peripheral center plate 14. In this magnetic circuit, a predetermined gap is formed between the
innermost peripheral portion 11a of the outer peripheral side center plate 11 and the outermost
peripheral portion 14a of the inner peripheral side center plate 14, and a voice coil 24 described
later is formed in this gap. Is placed. Then, the frame 15 is attached on the outer peripheral side
center plate 11, and the edge portion 22 of the diaphragm 20 is supported by the pressing
member 16 at the annular outermost peripheral portion of the frame 15.
[0003]
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The diaphragm 20 is composed of a circular cone 21, an edge 22 of the outer periphery thereof,
a center cap 23 and a coil bobbin 24 at the center, and a voice coil 25 is wound around the coil
bobbin 24. Then, the coil bobbin 24 on which the voice coil 25 is wound is inserted into the gap
formed between the innermost peripheral portion 11 a of the outer peripheral side center plate
11 and the outermost peripheral portion 14 a of the inner peripheral side center plate 14. . At
this time, the dampers 26 and 27 are attached to the upper and lower coil bobbins 24 of the
voice coil 25, the upper damper 26 is connected to the frame 15, and the lower damper 27 is
connected to the outer peripheral side center plate 11, The coil bobbin 24 is swingably
supported by the dampers 26 and 27 of FIG. Such a damper having dampers disposed above and
below the voice coil is referred to as a double damper structure. Such a double damper structure
is applied to a relatively large speaker unit.
[0004]
According to the speaker unit configured as described above, the coil bobbin 24 vibrates
according to the drive signal (audio signal) supplied to the voice coil 25, the cone 21 vibrates by
the coil bobbin 24, and is supplied to the voice coil 25. The sound based on the voice signal is
reproduced.
[0005]
By the way, on the cone 21 constituting the diaphragm used in the speaker unit having such a
configuration, a reinforcing projection usually called a rib is formed.
That is, for example, as shown in FIGS. 8 and 9, the ribs 21a, 21b, 21c,... 21m are formed
concentrically at regular intervals on the cone 21 so as to increase the strength of the
diaphragm. By forming the ribs 21a to 21m in this manner to increase the strength of the
diaphragm, the vibration state of the diaphragm is improved.
[0006]
However, when the ribs are provided as described above, the characteristics may be deteriorated
depending on the frequency band to be reproduced. That is, when reinforced with concentric
ribs, divided vibration often occurs in the diaphragm, and the flat frequency characteristic is lost.
For example, when driving a speaker with a large amplitude, divided vibration appears notably,
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and so-called sound collapse occurs.
[0007]
In addition, although the speaker unit of a double damper structure was demonstrated here, the
same problem arises also in the case of the cone-type speaker of one normal structure of
dampers.
[0008]
In view of these points, the present invention aims to provide a speaker unit that can obtain good
frequency characteristics using this type of diaphragm.
[0009]
According to the present invention, for example, as shown in FIG. 1, a frame 15, a diaphragm 20
having an edge 22 supported by the frame 15, and a coil bobbin 24 attached to the diaphragm
20. And a magnetic circuit 11 to 14 configured around the voice coil 25. By supplying a
predetermined signal to the voice coil 25, sound corresponding to the signal is reproduced. In the
speaker unit to be manufactured, a plurality of concentric ribs 31 to 39 are provided on the
diaphragm 20, and the width (or the interval of arranging the ribs) of the ribs 31 to 39 is
changed.
[0010]
Also, in this case, the interval at which the ribs are provided or the width of the ribs is changed so
that the strength gradually increases in the central direction of the diaphragm 20.
[0011]
According to the present invention, the strength of the diaphragm can be partially changed by
changing the widths of the plurality of concentrically arranged ribs 31 to 39 or the intervals at
which the ribs 31 to 39 are arranged. By arranging the ribs so as to suppress divided vibration
and the like, the frequency characteristics of the speaker can be improved.
[0012]
In this case, the inner circumferential side of the diaphragm 20 is strongly reinforced by
changing the spacing between the ribs or the width of the ribs so that the strength gradually
increases in the central direction of the diaphragm 20. At the time of large amplitude, etc., good
frequency characteristics can be obtained in which no split vibration occurs.
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[0013]
DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will
be described below with reference to FIGS.
In FIG. 1, parts corresponding to FIG. 7 described in the conventional example are given the same
reference numerals, and the detailed description thereof is omitted.
[0014]
FIG. 1 is a cross-sectional view showing the speaker unit of this embodiment. In this embodiment,
a plurality of ribs 31, 32, 33,... 39 are formed concentrically on the cone 21 constituting the
diaphragm 20. As shown in FIG.
In this case, the width of the ribs is made wider as it goes from the outermost rib 31 to the
innermost rib 39.
2 and 3, the width of the outermost rib 31 is d1, the width of the next rib 32 is d2, and the width
of the next rib 33 is d3... Assuming that the width of the rib 39 is d9, the following relationship is
maintained.
[0015]
D1> d2> d3> d4> d5> d6> d7> d8> d9
[0016]
For example, the width d9 of the innermost circumferential rib 39 is made 4.0 mm wider than
the width d1 of the outermost circumferential rib 31 by sequentially expanding the width by 0.5
mm from the width d1 of the outermost circumferential rib 31.
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Also, the width (see FIG. 3) of the groove 40 on the outer side of the outermost rib 31, the
grooves 41 to 48 between the ribs 31 to 39, and the inner groove 49 of the innermost rib 39 is
d0 Then, the widths d0 of the grooves 40 to 49 are all the same (for example, 0.5 mm).
[0017]
In addition, the cone | corn 21 of this example is formed based on a wood pulp.
[0018]
Further, as shown in FIG. 3, the cone 21 of the present example is inside the outer peripheral
portion 50 outside the groove portion 40 outside the outer peripheral rib 31 and the inner
groove portion 49 inside the inner peripheral rib 39. The inner circumferential portion 51 also
has substantially the same thickness as the ribs 31 to 39.
[0019]
Next, the configuration of the speaker unit of the present example using the diaphragm 20 using
the cone 21 configured in this way will be described. In the present example, as shown in FIG. ,
27 are disposed in the speaker unit of the double damper structure, and the through hole 11b is
provided in the outer peripheral side top plate 11 constituting the magnetic circuit, and the
through hole 15a is also provided at the corresponding position of the frame 15 in contact with
the top plate 11. And the two through holes 11b and 15a are continuous.
In this case, at the outlet of each of the through holes 11b and 15a, tapered portions 11c and
15b in which the diameter of the holes gradually widens are provided.
A plurality of the through holes 11b and 15a are arranged at predetermined intervals.
[0020]
Also, a through hole 12a is provided in the bottom plate 12 that constitutes the lower end of the
magnetic circuit.
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Also in the case of the through hole 12a, a tapered portion 12b in which the diameter of the hole
of the outlet gradually widens is provided.
In addition, a plurality of the through holes 12a are arranged at predetermined intervals.
[0021]
The other parts are configured in the same manner as the speaker unit shown in FIG. 7 as a
conventional example.
[0022]
According to the speaker unit of this example configured in this way, it operates as a speaker
with good characteristics.
That is, as shown in FIGS. 2 and 3 as the cone 21 constituting the diaphragm 20, the widths of
the plurality of concentrically arranged ribs 31 to 39 are sequentially changed, so that the
strength of the diaphragm 20 is centered. As it approaches, it becomes strong, it becomes
possible to suppress a division vibration etc. effectively, and the frequency characteristic as a
speaker improves.
In particular, good frequency characteristics can be obtained in which no divided vibration
occurs even at large amplitudes and the like.
[0023]
Here, the frequency characteristic of the speaker unit using the diaphragm 20 of the shape of
this example is the frequency characteristic of the conventional speaker unit using the
diaphragm in which the ribs having the same width shown in FIGS. 8 and 9 are arranged at equal
intervals. The state compared with is shown in FIG. In FIG. 4, the characteristic f1 shown by a
thick line is the frequency characteristic of the speaker unit using the diaphragm 20 of the shape
of this example, and the characteristic f2 shown by a thin line is the frequency characteristic of
the speaker unit using a conventional diaphragm. It is. As shown in FIG. 4, it can be seen that the
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speaker unit using the diaphragm 20 of this example has flatter frequency characteristics and
better characteristics.
[0024]
In the above embodiment, the widths of the ribs are sequentially changed to change the strength
of the diaphragm between the central portion and the peripheral portion, but other factors may
be changed to change the strength of the diaphragm. . For example, as shown in FIG. 5, a
plurality of ribs 61, 62... 68 of the same width d 10 are arranged concentrically, and the
distances d11, d12, d It is also possible to use a cone 60 in which the strength is gradually
increased toward the center.
[0025]
Alternatively, as shown in FIG. 6, as the ribs 71, 72, 73... 76, the width d 21 of the rib 71 on the
outer peripheral side is made the narrowest, The cone 70 is used in which the strength is
gradually increased toward the center by sequentially narrowing the distances d31, d32, d33.
You may.
[0026]
Further, although the above-described embodiment is applied to the speaker unit having the
double damper structure, it is of course possible to apply the present invention to a normal conetype speaker unit having one damper.
[0027]
According to the present invention, the strength of the diaphragm can be partially changed by
changing the widths of the plurality of concentrically arranged ribs or the intervals between the
respective ribs, so that the divided vibration can be obtained. By arranging the ribs so as to
suppress the noise etc., the frequency characteristic as the speaker is improved.
[0028]
In this case, the inner peripheral side of the diaphragm is strongly reinforced by changing the
distance between the ribs or the width of the ribs so that the strength gradually increases in the
central direction of the diaphragm. Favorable frequency characteristics that do not generate
divided vibration and the like at the time of amplitude and the like can be obtained.
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