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JP2005197916

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DESCRIPTION JP2005197916
The present invention relates to a speaker diaphragm used in electronic devices such as various
audio devices, and it is an object of the present invention to realize stabilization of frequency
characteristics. SOLUTION: The speaker diaphragm of the present invention is provided with
areas 27a and 27b different in internal loss of at least two or more types, and by using this
configuration, physical property values of the entire speaker diaphragm 27 can be obtained.
While maintaining it, unnecessary resonance of the diaphragm can be reduced and stable
frequency characteristics can be realized. [Selected figure] Figure 1
Speaker diaphragm, speaker using the speaker diaphragm, and electronic apparatus using the
speaker
[0001]
The present invention relates to a speaker diaphragm used for electronic devices such as audio
equipment, a speaker using the speaker diaphragm, and an electronic device using the speaker.
[0002]
A conventional speaker diaphragm will be described with reference to FIG.
As shown in FIG. 5, the diaphragm 7 for a speaker is formed by a papermaking method with a
diaphragm material whose beating degree is adjusted so that desired characteristics can be
achieved. The edge 9 is coupled to the outer peripheral portion of the speaker diaphragm 7.
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[0003]
In the internal state of the speaker diaphragm 7, fibers with a single degree of free distribution
are uniformly distributed, and the internal loss is uniform.
[0004]
As prior art document information related to the invention of this application, for example,
Patent Document 1 is known.
JP-A-61-123398
[0005]
The above-described speaker diaphragm 7 is formed using a hard material or a material having a
high degree of beating in terms of material physical property values in order to expand the
reproduction frequency band as a speaker, that is, to expand the high frequency band limit
frequency. Was.
[0006]
However, although high frequency band upper limit frequency expansion as a speaker can be
realized, when the diaphragm 7 for the speaker becomes hard, its internal loss decreases and
peaks and dips occur on the sound pressure frequency characteristic, resulting in characteristic
deterioration. Had the task of
[0007]
An object of the present invention is to solve the above-mentioned problems, and to provide an
excellent loudspeaker diaphragm capable of realizing stable frequency characteristics by
reducing peaks and dips on sound pressure frequency characteristics.
[0008]
In order to solve the above-mentioned subject, the present invention has the following
composition.
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[0009]
The invention according to claim 1 of the present invention is a speaker diaphragm formed by a
papermaking method, in which at least two or more areas having different internal losses are
provided, and a portion where unnecessary resonance is likely to occur. By arranging a material
having a high internal loss, unnecessary resonance can be reduced and stable frequency
characteristics can be realized.
[0010]
The invention according to claim 2 of the present invention is the speaker diaphragm according
to claim 1, wherein at least two areas having different internal losses are formed by varying the
degree of beating of a single material. This makes it possible to improve productivity and unify
the timbre, which are the features of a single material.
[0011]
The invention according to claim 3 of the present invention is one in which a speaker is
configured using any one of the diaphragms according to claim 1 or claim 2, and by using this
configuration, the speaker diaphragm can be obtained. Unwanted resonance can be reduced, and
a speaker with stable frequency characteristics can be realized.
[0012]
The invention according to claim 4 of the present invention is an electronic device provided with
the speaker according to claim 3 and means for amplifying an electric signal to be input to the
speaker. With this configuration, frequency characteristics of the electronic device can be
obtained. Stabilization can be realized.
[0013]
According to the fifth aspect of the present invention, the loudspeaker according to the third
aspect is installed in a movable space, and with this configuration, stabilization of the frequency
characteristic of the loudspeaker in the mobile object is realized. It can be done.
[0014]
As described above, the speaker diaphragm of the present invention is formed by the paper
making method, and the diaphragm is not necessary even in a state where the high frequency
band is expanded by providing at least two or more areas with different internal losses. The
resonance can be reduced and stable frequency characteristics can be realized.
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[0015]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
[0016]
An embodiment of the present invention will be described, in particular, a track-shaped slim
speaker in which unnecessary resonance of the speaker diaphragm is significantly generated.
[0017]
First Embodiment The first and second embodiments of the present invention will be described
below with reference to the first embodiment.
[0018]
FIG. 1 is a plan view of the diaphragm of the first embodiment of the present invention.
[0019]
As shown in FIG. 1, the speaker diaphragm 27 is formed by arranging two types of materials
different in internal loss in different areas 27a and 27b on the same surface by a papermaking
method.
[0020]
The edge 29 is coupled to the outer peripheral portion of the speaker diaphragm 27.
[0021]
Here, the area 27a is formed of a material having a high internal loss, and one area 27b is
formed of a material having a low internal loss.
[0022]
With this configuration, the physical property value of the entire speaker diaphragm 27 is
maintained by the effect of the material with a low internal loss in the area 27b, and the area of
the speaker diaphragm 27 where unnecessary resonance easily occurs is internally By arranging
the material with high loss, unnecessary resonance can be reduced and stable frequency
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characteristics can be realized.
[0023]
Further, the invention according to claim 2 of the present invention realizes the above-mentioned
material of the speaker diaphragm 27 with a single material, and the difference between the
internal losses of the areas 27a and 27b means the beating of the material The effect is obtained
by making the degree different.
[0024]
With this configuration, it is possible to improve productivity and unify the timbre, which are the
features of a single material.
[0025]
Furthermore, the material of the speaker diaphragm 27 is not limited to paper, as long as the
material can be used for paper-based papermaking.
That is, it is possible to control the physical properties widely by using a material obtained by
mixing paper and a reinforcing filler such as a resin and a metal-based material and further mica
and carbon.
[0026]
Second Embodiment The invention according to the third aspect of the present invention will be
described below with reference to a second embodiment.
[0027]
FIG. 2 shows a cross-sectional view of a loudspeaker according to a second embodiment of the
present invention.
[0028]
As shown in FIG. 2, the magnetized circuit 21 is configured by sandwiching the magnetized
magnet 21 by the upper plate 22 and the lower plate 23.
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[0029]
The inner periphery of the frame 26 is coupled to the upper plate 22 of the magnetic circuit 24,
and the diaphragm 27 of the present invention is adhered to the outer periphery of the frame 26
through the edge 29 and is driven to the diaphragm 27 for the speaker The voice coil 28 is
connected to make it.
[0030]
The voice coil 28 is coupled so as to fit in the magnetic gap 25 of the magnetic circuit 24.
[0031]
With this configuration, unnecessary resonance of the speaker diaphragm 27 can be reduced,
and a speaker with stable frequency characteristics can be realized.
[0032]
Third Embodiment The invention according to the fourth aspect of the present invention will be
described below with reference to the third embodiment.
[0033]
FIG. 3 is an external view of an audio mini-component system which is an electronic apparatus
according to a third embodiment of the present invention.
[0034]
As shown in FIG. 3, the speaker 40 of FIG. 2 is incorporated in the enclosure 41 to constitute a
speaker system.
A mini-component system 44 for audio, which is an electronic device, is constituted by the
speaker 40, an amplifier 42 which is an amplifying means of an electric signal inputted to the
speaker 40, and a player 43 which outputs a source inputted to the amplifier 42. It is.
[0035]
With this configuration, stabilization of the frequency characteristics of the electronic device can
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be realized.
[0036]
Fourth Embodiment The invention according to the fifth aspect of the present invention will be
described below with reference to a fourth embodiment.
[0037]
FIG. 4 shows a cross-sectional view of a main body 50 of an automobile according to a fourth
embodiment of the present invention.
[0038]
As shown in FIG. 4, the speaker 40 of the present invention is installed in the main body 50 of a
car which is a movable space.
[0039]
With this configuration, the comfort of the vehicle can be enhanced by the speaker 40 with
stable frequency characteristics.
[0040]
The speaker diaphragm according to the present invention can be applied to electronic devices
such as various acoustic devices that reduce unnecessary resonance and require stabilization of
frequency characteristics.
[0041]
Top view of the speaker diaphragm in the first embodiment of the present invention Cross
section of the speaker in the second embodiment of the present invention Front view of the
electronic device in the third embodiment of the present invention Cross section of the fourth
embodiment of the present invention Top view of conventional diaphragm
Explanation of sign
[0042]
21 magnet 22 upper plate 23 lower plate 24 magnetic circuit 25 magnetic gap 26 frame 27
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speaker diaphragm 27a area 27b area 28 voice coil 29 edge 40 speaker 41 enclosure 42
amplifier 43 player 44 mini component system 50 main unit
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