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JP2003023693

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DESCRIPTION JP2003023693
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudspeaker using a novel acoustic material and a loudspeaker to which the loudspeaker is
applied.
[0002]
Conventionally, most speakers of this type use a diaphragm made of paper pulp or a diaphragm
made of polypropylene.
[0003]
2. Description of the Related Art Therefore, in a conventional speaker using a diaphragm made of
this type of paper pulp, the diaphragm is often used in an environment exposed to the outside
air, so that the humidity resistance, Environmental resistance, such as temperature resistance and
gas resistance, is required.
Further, among such environmental characteristics, in the case of a speaker mounted on a vehicle
such as a car or a motorcycle, it has vibration resistance, impact resistance, dust resistance, etc.,
as well as ultraviolet resistance (UV resistance) characteristics, discoloration resistance There is
also a problem that weatherability including the above is particularly required.
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1
[0004]
Therefore, in the present invention, in order to solve the problems which such a conventional
speaker had, by using a diaphragm made of ultrafine-foamed polyethylene terephthalate resin
(PET), the speaker is weather resistant. In addition, as a speaker for vehicles, etc., the LED which
responds to the vibration of the diaphragm by combining it with a power generation mechanism
such as an LED and an induction coil disposed in front of the diaphragm. It is an object of the
present invention to provide a speaker capable of projecting the light of the above into the front
of the diaphragm and reflecting it, and emitting the reflected light from the entire surface of the
diaphragm to enhance the beauty and taste of the viewer.
[0005]
The characteristics of the conventional diaphragm are weak to the moisture resistance of a
paper-made diaphragm mainly made of paper pulp fibers, and the fading is strong in ordinary
environment, and the aging resistance is It has poor properties, has a hard outer surface like a
metal diaphragm, is high in Young's modulus, is susceptible to harmonic distortion due to split
vibration, and has poor processability such as adhesion, or polypropylene Although the density is
low, such as a rigid diaphragm made of synthetic resin like this, and a diaphragm made of
expanded polystyrene, it has various disadvantages in that it has poor rigidity and poor heat
resistance.
[0006]
On the other hand, the diaphragm made of ultrafine foamed polyethylene terephthalate resin
(PET) according to the present invention should be provided as a diaphragm of a speaker, and
has a large rigidity value (Young's modulus), a small density, and a moderate density. Fully
possess three required properties of vibration transmission loss, and furthermore, it has excellent
weather resistance such as high moisture resistance, heat resistance and fatigue resistance, and
excellent properties such as ease of processing. .
[0007]
That is, the diaphragm made of ultrafine-foamed polyethylene terephthalate resin (PET) of the
present invention has a bulkiness (bulky property) (divisional vibration resistance) larger than
that of the diaphragm made of the other material described above. Because the density is smaller
than others (0.25 to 0.35 g / cm3), harmonic distortion is extremely small and the weight as a
diaphragm is small (2.3 g: 16 cmφ), so the reproduced sound as a speaker The pressure
characteristic (sound pressure level) has an excellent characteristic which is not found in any
conventional diaphragm.
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2
[0008]
The diaphragm of the speaker made of ultrafine foamed polyethylene terephthalate resin (PET)
according to the second aspect of the present invention has a total reflectance of 99% or more as
its unique property, of which the diffuse reflectance is 96 It has a light reflectivity of up to 50%,
and it reflects almost equally from the blue of 400 nm to the red of 700 nm, so any color LED
etc. will effectively blink its weak light source with small energy The light is reflected, beautifully
captured visually, and appealed to the viewer with an aesthetic appearance.
[0009]
The configuration of the present invention for achieving the object will be described with
reference to FIGS. 1 to 3 and Tables 1 to 3 corresponding to the embodiments. The invention is a
speaker 1 equipped with a frusto-conical diaphragm 5 made of a material formed by ultrafine
foaming of polyethylene terephthalate resin (PET) with an average cell size of 30 microns or less,
preferably 10 microns or less. is there.
[0010]
Further, according to the second invention, the cylindrical support 11 is attached to the central
magnetic pole 2b 'of the magnetic circuit 2' of the speaker 1 'at its base, and the voice coil
bobbin 3a is attached to the center of the support 11 The induction coil 12 is wound with a gap
from the above, and a plurality of the LEDs 13 are attached to the LED holder 13a attached to the
tip of the support 11 radially toward the surface of the outer diaphragm 5 It is a speaker 1 'as
described in 1st invention.
[0011]
Since the speaker using the diaphragm made of ultra-fine foamed polyethylene terephthalate
resin (PET) according to the present invention has such a configuration, it may be used in the
same usage as the conventional speaker. , The rigidity value (Young's modulus) of the diaphragm
is large, the density is small, and the three major properties of moderate vibration loss are fully
satisfied, and furthermore, high moisture resistance, heat resistance, fatigue resistance,
processing It has excellent properties such as ease.
In addition, the moldability is also softened at a relatively easy-to-handle temperature of 177 °
C., so a molding die with a surface temperature of about 180 ° C. easily and accurately finished
dimensions in a short time And mass production that can be heat-molded.
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3
[0012]
The diaphragm made of ultrafine foamed polyethylene terephthalate resin (PET) according to the
present invention has a density which is larger than that of the diaphragm made of the abovementioned other material, even if the thickness (bulky property) (divisional vibration resistance)
is large. Is extremely small (0.25 to 0.35 g / cm 3), harmonic distortion is extremely small, and
the weight as a diaphragm is small (2.3 g: 16 cmφ), so the reproduced sound pressure
characteristics (sound pressure level) as a speaker Has excellent characteristics not found in any
conventional diaphragms.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION Accordingly, in the loudspeaker of the
present invention, a diaphragm made of ultrafine-foamed polyethylene terephthalate resin (PET)
attached thereto is used as it is in the same manner as a conventional diaphragm. As a result, it is
not only convenient that it is unnecessary to make any change in the speaker manufacturing
process, but also the quality can be improved in uniformity.
[0014]
According to the second aspect of the present invention, based on the speaker of the first aspect
of the present invention, the fluctuation of the magnetic field generated by the vibration of the
voice coil of the speaker of the first aspect of the present invention is inductively generated by
the induction coil. It is a speaker as an application product which inputs and adds as a light
emission mechanism, and makes an LED etc. blink in response to vibration of a voice coil,
Therefore, the speaker of the 2nd invention is the performance of the speaker of the 1st
invention The characteristic is, of course, maintained as it is, and is a speaker equipped with a
taste-inspiring function, which is not included in the speaker of the first invention, and stimulates
vision.
[0015]
Furthermore, since the speaker of the second invention has the construction as described above,
it is possible to mix and flow on the same assembly flow work conveyor as the first invention
speaker. Since storage and management of constituent materials can be facilitated, it is possible
not only to save space at the manufacturing site, but also to reduce manufacturing costs.
[0016]
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4
Embodiments of the present invention will be described below with reference to the drawings.
In the drawings, FIGS. 1 to 3 and Tables 1 to 3 are views showing an embodiment of the present
invention, and FIG. 1 is a cross-sectional view of the first invention speaker.
FIG. 2 is a cross-sectional view showing an embodiment in which an LED and a power generation
mechanism are combined with a speaker 1 'having the same configuration as the abovementioned speaker 1 in another embodiment shown as the second invention.
[0017]
In FIG. 1, 1 is a speaker, and 2 is a magnetic circuit in which an annular magnetic gap 2a of a
magnetic flux density of usually 9000 to 12000 gauss is formed by a magnet 7, and the outside
thereof is held and fixed by a frame 6. doing.
A voice coil 3 is attached to the frame 6 via a damper 4 so as to suspend the annular magnetic
gap 2a so as not to touch the domain wall.
The tip of the frusto-conical diaphragm 5 is adhesively fixed to the tip of the voice coil bobbin 3a.
The outer periphery of the frusto-conical diaphragm 5 is bonded to the inner periphery of the
edge 5 a, and the outer periphery of the edge 5 a is bonded to the outer edge of the frame 6.
[0018]
The frusto-conical diaphragm 5 of the speaker according to the present invention is made of
polyethylene terephthalate resin (PET) by superfine foaming having an average cell size of 30
microns or less (MCPET: manufactured by Furukawa Electric Co., Ltd.) The internal cross section
is 5.0 times the expansion ratio of the resin material as shown in the microphotograph shown in
FIG. 3, the average cell size is 30 microns or less, and the material of the other self-derived
diaphragm Since it contains a large amount of cavities compared to the above, as shown in Table
1, the density is 1⁄2 or less of that of the paper pulp diaphragm, and it is approx. Since the
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5
rigidity is high despite being 1/4, the reproduction sound pressure of the speaker of the present
invention is 1.5 dB higher on average than the others, and the second harmonic distortion is also
seen from the characteristic graph of Table 2. The third harmonic distortion is also small Kuna'
Te, the physical properties of the diaphragm, that is androgynous numerical values far superior
to conventional paper pulp manufactured diaphragm and polypropylene diaphragm is obvious.
[0019]
[Table 1]
[0020]
Table 2 is a characteristic graph of the speaker according to the present invention, wherein is a
sound pressure frequency characteristic at 0 ° on the central axis of the speaker, is a frequency
characteristic of second harmonic distortion, and is a third harmonic distortion. Is a graph of the
frequency characteristics of the impedance of the voice coil.
[0021]
Table 3 is a graph showing the total reflectance of light in the visible light region of the
diaphragm of the speaker of the present invention.
[0022]
That is, regarding the physical properties of the diaphragm used in the speaker of the present
invention having a diameter of 16 cm, as shown by the comparison values in Table 1, the
conventional paper pulp diaphragm does not have a high sound pressure of the speaker and tan
δ is Small, large distortion.
The appearance quality is poor.
In addition, PP diaphragms have disadvantages such as large tan δ and small distortion but
large weight and low speaker reproduction sound pressure.
[0023]
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On the other hand, although the diaphragm of the speaker of the present invention has a small
weight, a large thickness can be obtained, divisional vibration hardly occurs, and distortion is
small.
Even if the characteristic table of Table 2 is referred to, the specific physical properties appear in
the excellent properties of the diaphragm.
[0024]
In another embodiment shown in FIG. 2, a cylindrical support 11 is attached at its base to the
central magnetic pole 2b 'of the magnetic circuit 2' of the speaker 1 'having the same
configuration as that of the speaker 1 described above. The induction coil 12 is wound around
the middle part of the support 11 with a gap from the voice coil bobbin 3a '.
At the tip of the support 11, an LED holder 13a having a plurality of LEDs 13 mounted radially
toward the surface of the outer diaphragm 5 is attached. The outer wall of the LED holder 13a is
a diaphragm that emits light of the LEDs 13 Space is open so that it can be emitted efficiently to
5.
[0025]
When this happens, an audio signal is input to the speaker 1 ', the voice coil 3' vibrates in the
magnetic gap 2a ', the vibration is transmitted to the diaphragm 5', and the diaphragm 5 'is
vibrated. And radiate as voice.
At this time, the voice coil 3 'vibrates to generate a magnetic field by induction and magnetic flux
of the magnetic gap 2a' in the immediate vicinity.
In the induction magnetic field, an induction current induced by the vibration of the voice coil 3
'flows through the induction coil 12 which is wound around the voice coil bobbin 3a' with a gap.
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The voltage is 2 to 3 volts, and although the LED 13 emits light, it can be amplified and boosted
as required.
[0026]
Thus, the LED 13 can emit light of blue, red, yellow or the like in a flickering manner
corresponding to the strength of the vibration of the voice coil 3 'of the speaker 1'.
The LED 13 is disposed at a close distance toward the surface of the diaphragm 5 'of the speaker
1', and the diaphragm 5 'is made of polyethylene terephthalate resin (PET). Since it is a material
formed by foaming (MCPET: manufactured by Furukawa Electric Co., Ltd.), it is weak due to its
excellent reflection characteristic of about 99% or more of the total reflectance of light in the
visible light region as shown in the graph of Table 3. In the emission light of the LED 13 as well,
most incident light is totally reflected, and the diaphragm 5 'of the speaker blinks in response to
the level of the reproduced sound in a wide area to satisfy the sense of taste of the viewer .
[0027]
Although the embodiments considered to be representative of the present invention have been
described above, the present invention is not necessarily limited to only the structure of these
embodiments, and has the above-described constituent features according to the present
invention, and In order to achieve the object of the present invention, the present invention can
be appropriately modified and implemented within the scope having the effects described below.
[0028]
As is apparent from the above description, the diaphragm of the speaker according to the present
invention is made of a material formed of polyethylene terephthalate resin (PET) by ultrafine
foaming having an average cell size of 30 microns or less MCPET: manufactured by Furukawa
Electric Co., Ltd.), so the resin material has an expansion ratio of 5.0 times and an average cell
size of 30 microns or less, preferably 10 microns or less. Because it contains a lot of cavities in
comparison with other conventional diaphragm materials, its density is 1⁄2 or less that of paper
pulp diaphragms, and polypropylene resin diaphragms The sound reproduction efficiency is
improved because the reproduction sound pressure of the speaker is on average 2 dB higher
than that of the others, because the rigidity is high, which is extremely small, about 1⁄4 of that of
the speaker.
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8
[0029]
The second harmonic distortion and the third harmonic distortion are also reduced, and the
physical properties of the diaphragm are far superior to those of conventional pulp and paper
diaphragms and polypropylene diaphragms. It has a remarkable effect that can not be expected
from the conventional one having the
[0030]
Further, according to the strength of the vibration of the voice coil 3 'corresponding to the level
of the reproduced sound, the speaker 1' according to the present invention receives the output
voltage of the induction coil 12 for inductive power generation, LED 13 that emits light such as
red, yellow, etc. in a blinking manner is disposed at a close distance toward the surface of the
diaphragm 5 ', and an average bubble of polyethylene terephthalate resin (PET) of the diaphragm
5' A material (MC PET: manufactured by Furukawa Electric Co., Ltd.) with a size of 30 microns or
less, which is superfine foam, has excellent reflection characteristics of about 99% or more of the
total reflectance of light in the visible light range. Even with light, it totally reflects most of the
incident light, and the front surface of the diaphragm 5 'of the speaker emits reflected bright
light in a wide area, so it has the effect of satisfying the viewer's sense of taste
[0031]
Brief description of the drawings
[0032]
1 is a cross-sectional view showing an embodiment of the first invention.
[0033]
2 is a cross-sectional view showing an embodiment of the second invention.
[0034]
3 is a photomicrograph showing the internal cross section of the diaphragm of the speaker of the
present invention.
[0035]
Explanation of sign
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[0036]
1, 1 'speaker 2, 2' magnetic circuit 2a, 2a 'annular magnetic gap 2b' central magnetic pole 3, 3
'voice coil 3a, 3a' voice coil bobbin 4 damper 5, 5 'frustoconical diaphragm 5a, 5a 'Edge 6 Frame
7 Magnet 11 Support 12 Induction Coil 13 LED 13a LED Holder
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