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JP2007110356

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DESCRIPTION JP2007110356
PROBLEM TO BE SOLVED: To provide a diaphragm for an electroacoustic transducer which can
obtain good acoustic characteristics even if it has a simple structure and is thinned without the
need to separately provide a contact terminal. A diaphragm and a contact terminal are integrated
to solve the problems of the limitation of the thickness dimension of a dome-shaped speaker and
the expansion of the space in the width direction by providing a contact terminal portion.
Furthermore, by using a flexible substrate as the material of the diaphragm, it is easy to use a
metal film or the like for the reinforcing portion and the contact terminal portion. [Selected
figure] Figure 1
Speaker diaphragm
[0001]
The present invention relates to a diaphragm used in various acoustic devices.
[0002]
Conventional diaphragms for electroacoustic transducers have been developed with the goal of
three characteristics of light weight, high strength and high internal loss in order to improve the
followability to the input of the vibration source.
[0003]
Generally, in the high frequency range, the rising and falling slopes are both steep, and the rising
and falling characteristics are required in order to follow the attached vibration source also with
respect to the operation of the diaphragm.
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[0004]
Similarly, in the low frequency range where the frequency is low, the rising and falling slopes are
both gentle gradients, and the rising and falling characteristics of the diaphragm are also
required.
[0005]
As the basic characteristics of the diaphragm, as the diameter of the diaphragm increases, the
distance from the vibration source to the end of the diaphragm increases, so the arrival time of
the vibration becomes longer, and the follow-up performance with a long wavelength bass is An
excellent diaphragm can be obtained.
On the other hand, if the diameter of the diaphragm is reduced, the distance from the vibration
source to the end of the diaphragm is short, so the arrival time of the vibration becomes short,
and the diaphragm is excellent in the followability with high sound of short wavelength.
[0006]
For the above reason, the indoor installation type acoustic speaker is provided with a plurality of
electroacoustic generators, and by changing the acoustic generator to be used depending on the
reproduction range, good followability is obtained in a wide frequency band.
[0007]
However, since the size of the device is limited with respect to the relatively small electroacoustic
generator mounted on headphones or mobile phones, the size of the electroacoustic transducer
to be incorporated is limited and the diameter of the diaphragm is reduced. , The reproduction
band in the low range becomes narrow.
[0008]
With regard to such a relatively small diaphragm for an electroacoustic generator, a domeshaped diaphragm is used in which the reproduction zone is widened by providing a center dome
on the inner periphery and a sub dome on the outer periphery. A diaphragm capable of having
the above has been filed and registered as patent 3049570 (hereinafter referred to as patent
document 1).
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[0009]
In Patent Document 1, the entire diaphragm is thinly formed with respect to a conventional
dome-shaped diaphragm using a resin-based material, and the center dome portion is reinforced
with a reinforcing film while maintaining the low-range reproduction limit of the sub dome. It is
possible to raise the rigidity of the center dome and raise the high frequency reproduction limit.
[0010]
Moreover, the rigidity of a center dome can be uniformly raised by using a reinforcement film.
[0011]
Furthermore, since a hot melt of the same quality as that of the diaphragm is used in pasting,
variations in sensitivity and frequency response due to temperature changes of the center dome
can be minimized, and a diaphragm with good acoustic characteristics can be produced by a high
productivity method. It becomes possible to obtain.
[0012]
Also, by using a different material for the center dome and the sub dome separately from the
dome-shaped diaphragm in which the center dome and the sub dome are made of homogeneous
materials as described in Patent Document 1 and whose thickness improves the acoustic
characteristics. A diaphragm having a wide reproduction band and good acoustic characteristics
is filed and registered as patent 3211566 (hereinafter referred to as patent document 2).
[0013]
In Patent Document 2 described above, it is possible to set low-range and high-range acoustic
characteristics without being limited by the material, by impregnating different materials into the
center dome and the sub-dome of the base material molded into a dome shape.
[0014]
In addition, mass production is supported by using screen printing at the time of manufacture,
and it is possible to easily obtain the target acoustic characteristics by changing the combination
of the center dome and the sub dome.
[0015]
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Furthermore, since the rigidity of the whole diaphragm can be changed by changing the material
of the base material, the acoustic characteristics of the whole diaphragm are set by the base
material, and the acoustic characteristics of each of the high band and the low band are set by
each dome portion This makes it possible to reproduce the acoustic characteristics according to
the application.
[0016]
Patent No. 3049570 Patent No. 3211566
[0017]
In recent years, with the miniaturization of portable electronic devices and the like mounted on
the small-sized electro-acoustic transducer and diaphragm described above, thinning has been
required, and due to its structure, the dome-shaped diaphragm is divided when it is thinned
There is a problem that vibration is likely to occur.
[0018]
In addition, when a flat metal diaphragm is used, high rigidity and fine sound quality can be
obtained because of high rigidity, but it is difficult to obtain a wide reproduction bandwidth with
bass.
[0019]
In addition, with respect to each diaphragm, it is necessary to separately provide a contact
terminal of a voice coil, and in the case of thinning, limitation by the terminal can be made.
[0020]
To solve the above problems, it is not necessary to separately provide a contact terminal in the
present invention, and it is possible to provide a diaphragm for an electroacoustic transducer
which can obtain good acoustic characteristics even with a simple structure and a thin structure.
The purpose is.
[0021]
In order to solve the above-mentioned problems, in claim 1, in the diaphragm for an
electroacoustic transducer which has a vibration source and generates sound by the vibration of
the vibration source, an electrical contact terminal is integrally provided on the diaphragm. It is
characterized.
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[0022]
A second aspect of the present invention is characterized in that in the first aspect, the feeding
terminal is a conductive thin film integrated with the surface of the diaphragm.
[0023]
A third aspect of the present invention is characterized in that in the first and second aspects, the
diaphragm is made of a flexible printed circuit board.
[0024]
A fourth aspect of the present invention is characterized in that in the first to third aspects, the
voice coil attached to the diaphragm is electrically connected to a contact terminal provided on
the diaphragm.
[0025]
A fifth aspect of the present invention is characterized in that, in the first to fourth aspects, the
diaphragm has a reinforcing portion.
[0026]
According to the first aspect of the present invention, it is possible to obtain a diaphragm which
can be easily thinned with a simple structure without providing a separate contact terminal.
[0027]
According to the second aspect of the present invention, by forming the contact terminal portion
integrated with the diaphragm with a conductive thin film, the influence of the contact terminal
on the acoustic characteristics of the diaphragm is minimized, and good acoustic characteristics
are obtained. You can get
[0028]
According to the third aspect of the present invention, by making the diaphragm a flexible
printed circuit board, it becomes easy to provide the contact terminal portion on the diaphragm,
and when forming the contact terminal by the conductive thin film, Terminals can be easily
integrated.
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[0029]
As described above, in the invention described in claim 3, the invention is characterized by using
a flexible printed circuit as a diaphragm.
Therefore, the weight of the entire diaphragm can be reduced as compared with the conventional
diaphragm using a metal material, and the output sound pressure level can be improved.
[0030]
Further, by reducing the thickness of the diaphragm, the resonance frequency can be made lower
than that of the conventional resin diaphragm, and it becomes possible to widen the reproduction
band in the bass.
[0031]
According to the invention of claim 4, by using the terminal of the diaphragm as the feed
terminal of the voice coil, it is not necessary to separately provide a terminal for sound, and the
number of parts can be reduced to reduce the cost.
[0032]
According to the invention of claim 5, by providing the reinforcing portion, the divided vibration
of the diaphragm can be suppressed, and by increasing the rigidity, the reproduction band in the
high sound range can be widely taken, and good acoustic characteristics can be obtained. Is
possible.
[0033]
As described in the effect of the invention relating to the third aspect, in the present invention,
not only the reduction of the number of parts by integrating the diaphragm and the contact
terminal but also the reduction of thickness regarding the whole parts By using it, effects of
facilitation of manufacture, weight reduction of the diaphragm, and expansion of the bass
reproduction band by lowering the resonance frequency are obtained.
[0034]
According to the fifth aspect of the present invention, in addition to these effects, it is possible to
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obtain the effects of suppressing the divided vibration by providing the reinforcing portion and
expanding the reproduction band with high sound by improving the rigidity.
[0035]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1
to 3.
[0036]
FIG. 1 shows a diaphragm used in this embodiment.
[0037]
In order to realize the simplification of the diaphragm structure and the weight reduction of the
diaphragm, the substrate 1 shown in the present embodiment is configured by a flexible printed
substrate made of a polyimide film having a thickness of about 25 μm to 50 μm, glass epoxy,
etc. By providing reinforcing portions 2 formed of a copper foil pattern radially, divisional
vibration due to the shape of the diaphragm is reduced.
[0038]
Further, by providing the terminal portion 3 using copper foil at the end of the substrate 1, the
electroacoustic transducer to be mounted can be easily thinned, and the cost can be reduced by
reducing the number of parts.
[0039]
Furthermore, the thickness of the diaphragm itself is reduced by making the shape of the
substrate 1 not a dome shape but a thin film shape, and the entire diaphragm is made thin and
lightweight.
[0040]
With such a configuration, the diaphragm of the present embodiment has an output sound
pressure level improved by about 4 dB as compared with a diaphragm made of a conventional
metal material.
[0041]
Further, by forming the reinforcing portion 2 with the copper foil pattern, the resonance
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frequency is lowered by about 30% compared to the conventional one while suppressing the
divided vibration.
[0042]
FIG. 2 shows side sectional views of a multi-functional electro-acoustic transducer A including the
diaphragm of the present invention, an electro-acoustic transducer B including a conventional
dome-shaped diaphragm, and a multi-functional electro-acoustic transducer C.
[0043]
The electroacoustic transducers and multifunctional electroacoustic transducers A to C shown in
FIG. 2 have a movable part comprising a coil 21 attached to a diaphragm 20, a magnetic circuit
part comprising a pole piece 22, a magnet 23, and a yoke 24. The coil 21 of the movable part
vibrates due to the mutual magnetic force acting between them, and the diaphragm 20 is
vibrated to generate sound.
[0044]
Comparing the conventional electro-acoustic transducer B and multi-functional electro-acoustic
transducer C using the dome-shaped diaphragm with the multi-functional electro-acoustic
transducer A provided with the diaphragm of this embodiment, the diaphragm has a dome shape
It can be seen that the thickness increases due to the provision of the contact terminals 25 and
the space in the width direction also becomes larger than that of the multi-function acoustic
transducer A.
[0045]
This is because when the contact terminal is provided in the converter main body, a portion for
supporting the terminal component is required, and in the present invention, the diaphragm 20
and the terminal component are integrated to eliminate the support portion. It is possible to
increase the area of the diaphragm 20 while reducing the dimension in the thickness direction.
[0046]
FIG. 3 is an exploded perspective view of a movable portion and a magnetic circuit portion of a
multifunctional electro-acoustic transducer using the diaphragm of this embodiment.
[0047]
By using the diaphragm shown in the above embodiment, it is not necessary to separately
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provide a terminal part, and the manufacturing cost can be reduced by reducing the number of
parts.
[0048]
As described above, it is not necessary to separately provide a contact terminal by using the
diaphragm shown in the above embodiment, and the vibration for the electroacoustic transducer
can obtain good acoustic characteristics even if the structure is simple and thin. Can provide a
board.
[0049]
A diaphragm for electroacoustic transducer used in an embodiment of the present invention A
multifunctional electroacoustic transducer using the multifunctional electroacoustic transducer
provided with the diaphragm of the present invention and a conventional dome-shaped speaker
and an electroacoustic transducer Sectional view of the transformer An exploded perspective
view of the movable part and the magnetic circuit part of the multifunctional electroacoustic
transducer provided with the diaphragm of the present invention
Explanation of sign
[0050]
Reference Signs List 1 substrate 2 reinforcing portion 3 terminal portion 20 diaphragm 21 voice
coil 22 pole piece 23 magnet 24 yoke 25 contact terminal portion
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