JP2003125484

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DESCRIPTION JP2003125484
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device, and more particularly, to a speaker device in which an opening peripheral
portion of a diaphragm is attached to a flange portion of a frame via an edge damper.
[0002]
2. Description of the Related Art A conventional speaker device has, for example, a structure as
shown in FIG. 5 (see Japanese Patent Laid-Open No. 7-298391). In the figure, 1z is a
conventional speaker device, 2 is a lower plate, 2a is a center pole of the lower plate 2, 3 is a
ring-like spacer, and the center pole 2a is surrounded on the lower plate 2 It is provided in the
state. A ring-shaped upper plate 4 is fixed on the spacer 3 so as to surround the center pole 2a at
a suitable distance therefrom.
[0003]
A frame 5 is fixed to the upper spacer 3 and a voice coil 6 is positioned between the upper
spacer 3 and the center pole 2a at the center of the lower plate 2 and fixed to the lower portion
of the bobbin 7 . A damper 8 holds the bobbin 7 so as not to prevent its vertical movement, and
the outer peripheral edge is fixed to the inner peripheral edge of the frame 5 and the inner
peripheral edge is fixed to the bobbin 7. 9 is a trumpet-shaped diaphragm made of, for example,
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a thin resin, paper, etc. The inner peripheral edge is fixed to the upper part of the bobbin 7 and
the opening peripheral portion (outer peripheral edge) is the opening peripheral portion of the
frame 5 via the edge damper 10 It is fixed to the flange 5a of.
[0004]
The edge damper 10 is made of a generally ring-shaped rubber elastic body, and plays a role of
holding the opening peripheral portion of the diaphragm 9 so as not to prevent the vertical
movement of the diaphragm 9, and in the prior art, its sectional shape In this case, both ends of
the inverted U-shaped or semicircular bent portion 10c were bent outward to form attachment
portions 10a and 10b. 10a is an inner mounting portion, 10b is an outer mounting portion, and
an intermediate bent portion 10c between the mounting portions 10a and 10b serves as an
elastic portion that allows the diaphragm 9 to move up and down. In the edge damper 10, the
inner mounting portion 10a is bonded to the opening peripheral portion (outer peripheral edge)
of the diaphragm 9, and the outer mounting portion 10b is bonded to the flange portion 5a of
the frame 5.
[0005]
11 is a dust cap whose peripheral portion is fixed near the central portion of the diaphragm 9 to
protect the voice coil storage portion, 12 is a lead wire whose one end is connected to the voice
coil 6, and which crawls the surface of the diaphragm 9 An end of a portion which penetrates the
diaphragm 9 and protrudes from the diaphragm 9 to the back surface side is fixed to a terminal
plate 13 attached to the frame 5. A lead 14 is connected to the audio apparatus main body, and is
connected to a lead 12 connected to the voice coil 6 at the terminal board 13.
[0006]
By the way, in the audio apparatus, it is often required to improve the characteristics in the low
frequency range. That is, there are many cases where so-called good bass extension is required.
However, the improvement of the bass characteristics is limited by the outer diameter of the
diaphragm of the speaker, and the use of a small loudspeaker in the form of a diaphragm makes
it possible to use an audio device even though the frequency characteristic of the low frequency
range of the output of the audio device is excellent. The frequency characteristics in the low band
can not be enhanced.
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[0007]
Therefore, it can be said that it is necessary to use a speaker with a large outer diameter of the
diaphragm in order to improve the frequency characteristics in the low band. Therefore, in
general, it can be said that as the outer diameter of the diaphragm is increased, the speaker must
necessarily be increased. However, there are many cases where it is not possible to make the
speaker unnecessarily large. For example, in a car audio apparatus etc., a speaker is often
attached to the inside of a vehicle door, and it is not permitted to enlarge a speaker beyond the
restriction by a vehicle door.
[0008]
Notwithstanding, there were not a few drivers that required to improve the bass extension as
much as possible. Therefore, the inventor of the present application has made it possible to
increase the effective diaphragm outer diameter which determines the frequency characteristic
of the bass, even if the size of the speaker, more specifically, the outer diameter of the frame is
the same, in the conventional speaker device structure. We examined from the viewpoint of
whether we could
[0009]
And as a result of the examination, since the inventor of the present invention is attached to the
opening peripheral portion of the frame 5 outside the bent portion 10c of the edge damper 10 in
the conventional speaker device, the attachment portion 10b does not contribute to the extension
of the bass However, I noticed that it became an element to increase the outer diameter of the
frame 5. Therefore, the present invention was made to find out that the attachment portion
which does not contribute to the expansion of the bass does not become an element to increase
the outer diameter of the frame 5.
[0010]
That is, according to the present invention, in the speaker device, if the outer diameter of the
frame, that is, the size of the speaker device is the same, the frequency characteristic in the low
band is further enhanced or the frequency characteristic in the low band is the same. It is an
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object of the present invention to make it possible to make the speaker device smaller.
[0011]
According to a first aspect of the present invention, there is provided a speaker device according
to the first aspect, wherein adhesion of the edge damper to the flange portion of the frame is
closer to the central portion of the speaker device than the outermost periphery of the bent
portion of the edge damper. It is characterized by being able to
[0012]
Therefore, according to the speaker device of claim 1, the attachment portion to the frame of the
edge damper which can not contribute to the improvement of the frequency characteristic in the
low band is positioned approximately closer to the central portion of the speaker device itself
than the bent portion of the edge damper. Can be an element that increases the outer diameter of
the frame.
[0013]
As a result, the outer diameter of the frame, and hence the size of the speaker device, can
improve the frequency characteristics in the low band more.
Further, if the frequency characteristics in the low band are the same, the outer diameter of the
frame, and hence the speaker device, can be made smaller.
[0014]
In the speaker device according to the second aspect of the present invention, the side opposite
to the side of the edge damper bonded to the opening peripheral portion of the diaphragm is
provided with a protrusion projecting toward the central portion of the speaker device itself. It is
characterized in that it is adhered to the flange portion of the frame.
[0015]
Therefore, according to the speaker device of claim 2, the attachment of the edge damper to the
flange portion of the frame is performed by the projecting portion projecting in the direction of
the central portion of the speaker device itself, which contributes to the improvement of the
frequency characteristic in the low band. The protruding portion which is the mounting portion
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which can not be obtained can not be a factor to increase the outer diameter of the frame.
[0016]
As a result, the outer diameter of the frame, and hence the size of the speaker device, can
improve the frequency characteristics in the low band more.
Further, if the frequency characteristics in the low band are the same, the outer diameter of the
frame, and hence the speaker device, can be made smaller.
[0017]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention basically
adheres to a flange portion of a frame of an edge damper at a portion closer to the central
portion of the speaker device itself than the outermost peripheral edge of the bent portion of the
edge damper. For example, on the side opposite to the side bonded to the opening periphery of
the diaphragm of the edge damper, a protrusion projecting toward the center of the speaker
device itself is provided, and the edge damper is used in the protrusion It can be realized in the
form of bonding to the flange portion of the frame.
[0018]
The speaker apparatus according to the present invention can of course be applied to a single
speaker unit, but for a bass speaker unit, a speaker for high sound with a smaller outer diameter,
or a speaker for middle sound or high sound, etc. It goes without saying that the present
invention can also be applied to a speaker apparatus of a type in which one or more other
speaker units are provided.
[0019]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be
described in detail according to the illustrated embodiments.
FIG. 1 is a cross-sectional view showing the main part of a first embodiment 1a of the speaker
device of the present invention.
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In the drawing, 5 is a frame, 5a is a flange portion of the frame 5, 9 is a diaphragm, 20 is an edge
damper of the present speaker device, and its cross-sectional shape is formed by bending the
inner end of a semicircular bent portion 20c outward. A mounting protrusion 20f is integrally
formed with the mounting portion 20a and is formed integrally with the outer end portion 20b
and projecting inward (in the direction toward the center of the speaker device) from the outside
end 20b. And the mounting part of the
The mounting portion 20a is adhered to the outer peripheral edge of the diaphragm 9, the
mounting protrusion 20f is dropped into the step 5b provided on the flange 5a of the frame 5,
and the bottom surface thereof is adhesive 21 on the step 5b. It is glued through.
[0020]
In the present speaker device, the bonding portion between the edge damper 20 and (the flange
portion 5a of the frame 5) is positioned closer to the central portion of the speaker device itself
than the outermost peripheral edge of the bent portion 20c of the edge damper 20, and the
outermost peripheral edge It does not go out from the outside.
Therefore, the connecting portion between the edge damper 20 which can not contribute to the
improvement of the frequency characteristic in the low range and the frame 5 (the flange portion
5a thereof) can not be a factor to increase the outer diameter of the frame 5.
[0021]
Therefore, even if the outer diameter of the frame, and hence the size of the speaker device, is
the same, it is possible to further enhance the frequency characteristics in the low frequency
range.
Further, if the frequency characteristics in the low band are the same, the outer diameter of the
frame, and hence the speaker device, can be made smaller.
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[0022]
2A and 2B differ only in the sectional shape of the outer end of the edge damper and the
attachment of the outer end to the flange of the frame, and the vibration of the speaker device
manufactured under the same conditions in other points. It is a schematic structure sectional
view for comparing the example shown in Drawing 1 and a conventional example about the
substantial outside diameter of a board, (A) shows the example shown in Drawing 1, (B) shows a
conventional example. Here, the substantial outer diameter of the diaphragm refers not only to
the diaphragm but also to the portion vibrating with the diaphragm of the edge damper, that is,
the diameter of the outermost periphery of the bent portions 20c and 10c of the edge damper
shown in FIG.
[0023]
With the same magnetic circuit configuration, the frame outer diameter is both 230 mm, and the
bent portion of the edge damper has substantially the same curvature shape, as shown in FIG. 2
(A) and the prior art shown in FIG. 2 (B). In comparison with the case of 1 z, in the present
embodiment shown in FIG. 2 (A), the substantial outer diameter of the diaphragm can be made
221 mm, while in the conventional example shown in FIG. 2 (B) Could only be 214 mm. This
means that the substantial outer diameter of the diaphragm can be increased by about 7 mm.
[0024]
FIG. 3 is a frequency characteristic diagram showing frequency characteristics of Example 1a
shown in FIG. 2A and Conventional Example 1z shown in FIG. 2B. As is also apparent from this
figure, the present example 1a has better frequency characteristics in the low band than the prior
art example 1z. Specifically, it can be said that the lower band is wider by about 10 to 20 Hz in
this embodiment. It goes without saying that this difference is due to the difference in the
substantial outer diameter of the diaphragm.
[0025]
FIGS. 4A to 4C are cross-sectional views showing each of modified examples 1b to 1d of the
speaker device 1a shown in FIG. A modification 1b shown in FIG. 4A is not provided with the
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mounting projection 20b on the edge damper 20 as in the embodiment 1a shown in FIG. 1, but
the end of the modification is intensifying the degree of bending of the middle bent portion 20c.
20b is bonded to the flange portion 5a of the frame 5, and the bonded portion is prevented from
protruding outward from the outermost peripheral edge of the bent portion 20c. 21 is an
adhesive.
[0026]
In the modified example 1c shown in FIG. 4B, the end 20b of the edge damper 20 is bent so as to
form the groove 20d facing outward, and the frame 5 has an inward projecting portion fitted in
the groove 20d. In a shape having a shape 5d, the protruding portion 5d is inserted into the
groove 20d and adhered with an adhesive 21 so that the adhering portion does not protrude
outward from the outermost peripheral edge of the bent portion 20c. is there.
[0027]
In the modified example 1d shown in FIG. 4C, the end portion 20b of the edge damper 20 has a
cross-sectional shape having a groove 20e directed downward at the inside, and the frame 5 has
an upward projecting portion 5e fitted in the groove 20e. It is made to have a shape, and while
the protrusion 5e is fitted in the groove 20e, it is adhered with an adhesive 21 so that the
adhesion portion does not protrude outward from the outermost peripheral edge of the bent
portion 20c. .
[0028]
In any of the modifications 1b to 1d shown in FIGS. 4 (A) to 4 (C), the connection portion is the
frame 5 because the bonding portion is prevented from protruding outward from the outermost
peripheral edge of the bent portion 20c. It does not become an element to increase the outer
diameter of.
[0029]
Therefore, as in the embodiment 1a in FIG. 1, it is possible to further enhance the frequency
characteristics in the low frequency range even if the outer diameter of the frame 5, and hence
the size of the speaker device, is the same.
Also, if the frequency characteristics in the low band are the same, the outer diameter of the
frame, and hence the speaker device, can be made smaller.
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[0030]
According to the first aspect of the present invention, the mounting portion of the edge damper
which can not contribute to the improvement of the frequency characteristic in the low band is
located closer to the central portion of the speaker than the bent portion of the edge damper. Can
be an element that increases the outer diameter of the frame.
[0031]
As a result, the outer diameter of the frame, and hence the size of the speaker device, can
improve the frequency characteristics in the low band more.
Further, if the frequency characteristics in the low band are the same, the outer diameter of the
frame, and hence the speaker device, can be made smaller.
[0032]
According to the speaker device of claim 2, the attachment of the edge damper to the flange
portion of the frame is performed by the projecting portion protruding in the direction of the
central portion of the speaker device itself, so that it can not contribute to the improvement of
the frequency characteristic in the low region. The protruding part which is the mounting part of
the above does not become an element to increase the outer diameter of the frame.
[0033]
As a result, the outer diameter of the frame, and hence the size of the speaker device, can
improve the frequency characteristics in the low band more.
Further, if the frequency characteristics in the low band are the same, the outer diameter of the
frame, and hence the speaker device, can be made smaller.
[0034]
Brief description of the drawings
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[0035]
1 is a cross-sectional view showing the main part of one embodiment of the speaker apparatus of
the present invention.
[0036]
2A and 2B are schematic cross-sectional views for comparing the embodiment shown in FIG. 1
and the conventional example with respect to the substantial outside diameter of the diaphragm
of the speaker device, and FIG. An example is shown, and (B) shows a conventional example.
[0037]
3 is a frequency characteristic diagram showing the frequency characteristics of the present
embodiment shown in FIG. 2 (A) and the conventional example shown in FIG. 2 (B).
[0038]
4 (A) to 4 (C) are cross-sectional views showing the main parts of each modification of the
speaker device shown in FIG.
[0039]
5 is a cross-sectional view showing an essential part of one conventional example of the speaker
device.
[0040]
Explanation of sign
[0041]
1a to 1d: speaker device, 5: frame, 5a: flange portion of frame, 6: voice coil, 9: diaphragm, 20:
edge damper, 20a: diaphragm Side (inside) mounting portion, 20b: Frame side (outside)
mounting portion, 20c: bent portion, 20d: groove, 20e: groove, 20f: projecting portion.
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