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JP2007312269

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DESCRIPTION JP2007312269
The present invention provides a flat speaker in which sound quality such as directivity and
frequency characteristics is sufficiently improved. SOLUTION: A honeycomb core having a hollow
honeycomb structure made of organic fiber non-woven fabric, and a pair of glass provided so as
to sandwich the honeycomb core at both ends of the honeycomb core and seal the hollow portion
of the honeycomb core. A diaphragm for a flat speaker is configured from the woven base
material epoxy resin sheet. [Selected figure] Figure 2
Diaphragm for flat speaker and flat speaker using the same
[0001]
The present invention relates to a diaphragm for a flat speaker that vibrates a plate with a
magnetic coil, a piezoelectric vibrator, or the like to generate music and sound, and a flat speaker
using the diaphragm.
[0002]
Conventionally, NTX Corporation and others have long developed and put into practical use a
speaker that generates sound by vibrating a flat plate as a diaphragm (see, for example, JP-A1999-5122149).
Speakers of this type have the advantage of being lightweight, space-saving, and easy to install,
but in terms of sound quality such as tone range, frequency characteristics, and sound
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reproducibility, cone-shaped woofer, dome-shaped tweeter, and squawker The application was
extremely limited compared to the usual box type speaker mounted. JP-A-2004-64726 JP-A2002-78077
[0003]
An object of the present invention is to provide a flat speaker in which sound quality such as
directivity and frequency characteristics is sufficiently improved.
[0004]
In order to achieve the above object, according to the present invention, a honeycomb core of a
hollow honeycomb structure made of organic fiber non-woven fabric and sandwiching the
honeycomb core at both ends of the honeycomb core and sealing the hollow portion of the
honeycomb core And a pair of glass woven fabric-based epoxy resin sheets provided.
[0005]
The inventor conducted intensive studies to achieve the above object.
As a result, it has been found that by reducing the weight of the diaphragm of the abovedescribed flat speaker and making it excellent in rigidity, it is possible to obtain a flat speaker
excellent in sound quality such as directivity and frequency characteristics.
From this point of view, the present inventors set the core portion of the flat speaker as a
honeycomb core of a hollow honeycomb structure, and also constitute this honeycomb core from
an organic fiber non-woven fabric, and further using the glass woven fabric base epoxy resin
sheet as the honeycomb core. It has been found that, by embedding the hollow portion of the
above and sandwiching both ends thereof, it is possible to simultaneously achieve the reduction
in weight of the obtained diaphragm and the improvement in rigidity.
[0006]
Therefore, by configuring the flat speaker from the above-described diaphragm, it is possible to
improve the sound quality such as directivity and frequency characteristics of the flat speaker
due to the characteristics of light weight and high bending rigidity of the diaphragm.
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[0007]
Japanese Patent Application Laid-Open No. 2002-78077 discloses that a diaphragm of a flat
speaker has a hollow honeycomb structure.
However, in such a publication, there is no teaching as to the material composition of the sheet
for sealing the hollow honeycomb structure. Therefore, although the weight reduction due to the
hollow honeycomb structure can be achieved, the weight reduction and the rigidity improvement
can not be achieved by the material composition described above, and the orientation thereof is
compared with the flat speaker obtained in the present invention. And sound quality such as
frequency characteristics can not be sufficiently improved. JP 2002-78077 A
[0008]
In a flat speaker, an exciter converts an electric signal into vibration, and emits sound by
transmitting vibration to air through a flat panel (diaphragm). Therefore, when the rigidity of the
flat panel is small and soft, the panel can not follow the vibration of the exciter. That is, only the
periphery of the exciter vibrates, and most of the others can not obtain vibration at the required
frequency, resulting in extraneous noise or no required sound due to interference. In the case of
high-pitched sound (the frequency is high and the vibration is fast), the above-mentioned
phenomenon is particularly noticeable.
[0009]
From this point of view, when the panel is made of a hard material composition such as a
stainless steel plate in the panel, the rigidity of the panel can be increased, but the panel itself
becomes too heavy, and the exciter tries to vibrate the panel. Also, the panel can not follow the
vibration of the exciter because the inertial force of the panel becomes too large. As a result, even
if the same input signal is sent, only a low tone can be reproduced in a heavy panel composed of
such a stainless steel plate or the like.
[0010]
In addition, when a heavy panel such as a stainless steel plate is used, sufficient weight reduction
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can not be achieved even if the core portion constituting the panel is formed into a hollow
honeycomb structure, resulting in a speaker having poor efficiency.
[0011]
On the other hand, in the present invention, the honeycomb core of the panel (diaphragm) is
made of an organic fiber non-woven fabric, and the both end portions are sandwiched between
sheets made of lightweight and highly rigid material component of glass woven fabric base epoxy
resin. It is like that.
Therefore, in the present invention, since each component of the diaphragm is made of the
above-described material components, even when the diaphragm (panel) is vibrated by the
exciter, its rigidity and weight can be increased. As a result, sounds from bass to treble can be
reproduced under high directivity.
[0012]
As described above, according to the present invention, it is possible to provide a flat speaker in
which sound quality such as directivity and frequency characteristics is sufficiently improved.
[0013]
Hereinafter, other features and advantages of the present invention will be described in detail
based on the best mode for carrying out the invention.
[0014]
(Honeycomb Core) The diaphragm for a flat speaker of the present invention has a hollow
honeycomb structure honeycomb core made of an organic fiber non-woven fabric.
As the organic fiber non-woven fabric, an aramid non-woven fabric, a liquid crystal polymer nonwoven fabric or the like can be used.
For example, Metex (trade name) manufactured by DuPont can be used as the aramid non-woven
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fabric, and Beculus (trade name) manufactured by Kuraray Co., Ltd. can be used as the liquid
crystal polymer non-woven fabric.
[0015]
The hollow honeycomb structure can be formed by a known method. For example, a gas
generating agent is attached to the organic fiber non-woven fabric, a predetermined gas is
generated in the heating process in forming the diaphragm, and a hexagonal cavity caused by the
gas generation is formed in the non-woven fabric. can do. Examples of the gas generating agent
include sodium bicarbonate and the like.
[0016]
In addition, the cell size of the honeycomb core is not particularly limited, and when the
diaphragm including the honeycomb core is used as a flat speaker, it is appropriately adjusted to
have appropriate strength and weight. For example, when the thickness of the honeycomb core is
large, the cell size is increased, and when the thickness of the honeycomb core is small, the cell
size is decreased.
[0017]
Furthermore, since the thickness of the honeycomb core characterizes the thickness of the
diaphragm, the thickness is determined within a range that is appropriate for the diaphragm. For
example, in the present invention, the thickness of the honeycomb core can be 1.5 mm to 10
mm. This makes it possible to more effectively improve the directivity and frequency
characteristics of the diaphragm to be finally obtained.
[0018]
The thickness of the honeycomb core is preferably at least 15 times the thickness of the woven
glass substrate epoxy resin sheet described in detail below. When the thickness of the sheet is
too large relative to the thickness of the honeycomb core (the thickness of the honeycomb core is
not more than 15 times the thickness of the woven glass substrate epoxy resin sheet), the
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obtained diaphragm is a simple plate. It may be close to the form, and the characteristics of
weight reduction and high rigidity can not be sufficiently exhibited by providing the honeycomb
core in some cases. Therefore, it may not be possible to obtain a high-characteristic diaphragm
intended by the present invention.
[0019]
(Glass Woven Fabric Base Epoxy Resin Sheet) The diaphragm for a flat speaker of the present
invention has a pair of glass woven substrate epoxy resin sheets provided so as to sandwich a
honeycomb core of a hollow honeycomb structure made of organic fiber non-woven fabric. . This
glass woven fabric base epoxy resin sheet is formed so as to seal the hollow portion at both ends
of the honeycomb core. Specifically, the honeycomb core and the glass woven fabric base epoxy
resin sheet are formed by bonding by heating and pressing with a hot press or an autoclave-type
molding machine. Such adhesion is carried out along with the heat curing of the epoxy resin
constituting the sheet. In addition, when adhesion | attachment is inadequate, an adhesive agent
can be used suitably.
[0020]
The glass woven fabric base epoxy resin sheet can be formed, for example, by impregnating a
glass woven fabric with a thermosetting epoxy resin. The sheet obtained in this manner exhibits a
sufficiently high rigidity and can fully satisfy the effects of the present invention. However, the
sheet can also be formed in other ways. For example, it can also be obtained by sticking an epoxy
resin sheet on a glass fiber substrate.
[0021]
The glass woven fabric constituting the glass woven fabric base material needs to have
appropriate lightness and strength (rigidity), and the density thereof is 40 g / m <2> to 220 g /
m < 2> is preferable. Moreover, it is preferable that it is a plain weave structure. As such a glass
woven fabric, 106 type, 1080 type, 2116 type and 7628 type (all of which are IPC specifications)
used for building materials, printed wiring boards and the like can be used.
[0022]
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Moreover, as an epoxy resin which comprises the said glass woven fabric base material epoxy
resin sheet, it will not be specifically limited if adhesive strength is obtained after hardening, The
epoxy resin used for a general industrial product is used be able to. Specifically, epoxy resins
such as bisphenol A epoxy resin, bisphenol F epoxy resin, novolac epoxy resin, glycidyl ether
epoxy resin, alicyclic epoxy resin, and heterocyclic epoxy resin, and biphenyl skeleton are
included. Such polyfunctional epoxy resins can be used. These can be used alone or in
combination of two or more.
[0023]
Furthermore, in the case of imparting flame retardancy, an epoxy resin having a general flame
retardant mechanism such as a brominated epoxy resin or a phosphorus-modified epoxy resin
can also be used.
[0024]
In addition, when hardening the said epoxy resin, the hardening | curing agent for epoxy can be
used suitably.
As such curing agents for epoxy, general purpose ones can be used, and dicyandiamide, amine
curing system such as aromatic diamine, phenol novolac resin, cresol novolac resin, bisphenol A
novolac resin, triazine modified phenol novolac resin, etc. A phenol curing system etc. can be
used. These curing agents can be used alone or in combination of two or more.
[0025]
Moreover, in addition to the said hardening agent for epoxy, the hardening accelerator for epoxy
can also be used suitably. As such epoxy curing accelerators, general purpose ones can be used,
and imidazole compounds such as 2-ethyl-4-methylimidazole and 1-benzyl-2-methylimidazole,
boron trifluoride amine complex, triphenyl A phosphine etc. can be used. These curing
accelerators can be used alone or in combination of two or more.
[0026]
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In addition to the above-mentioned curing agent and / or curing accelerator, fillers of inorganic
or organic fine powder, pigments, anti-deterioration agents, etc. can be added to the abovementioned epoxy resin as appropriate. .
[0027]
Furthermore, it is preferable that the content rate of the said epoxy resin in the said glass woven
fabric base epoxy resin sheet is 35 weight%-70 weight%.
Also in this case, appropriate lightness and strength (rigidity) can be imparted to the sheet, and
the intended effects of the present invention can be sufficiently achieved.
[0028]
(Diagram for Flat Speaker) FIGS. 1 and 2 are configuration diagrams showing an example of the
flat speaker diaphragm of the present invention. FIG. 1 shows only the honeycomb core portion
from which the glass woven fabric base epoxy resin sheet has been removed, and FIG. 2 shows
the honeycomb core sandwiched between the resin sheets. Fig.2 (a) is a top view of the said
diaphragm, FIG.2 (b) is a side view of the said diaphragm.
[0029]
As shown in FIG. 1, in the diaphragm for a flat speaker of the present invention, the honeycomb
core 10 has a honeycomb structure in which hexagonal cells are densely packed, and as shown in
FIG. It can be seen that the hollow portions 10A of the honeycomb core 10 are sealed while
being sandwiched by the pair of glass woven fabric base epoxy resin sheets 20 respectively.
[0030]
When the thickness of the honeycomb core 10 is t1 and the thickness of the resin sheet 20 is t2,
as described above, it is preferable to satisfy the relationship of t1 ≧ 15t2.
[0031]
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EXAMPLES Hereinafter, the present invention will be specifically described based on examples,
but the present invention is not limited to these examples.
Further, "parts" in the following means "parts by weight".
[0032]
(Example 1) 70 parts of Epicoat 1001 (product name of Yuka Shell Co., Ltd.) of bisphenol A type
epoxy resin, 30 parts of cresol novolac epoxy resin YDCN-704P (product name of Toto Kasei Co.,
Ltd.), 3 parts of dicyandiamide propylene glycol Monomethyl ether was added to adjust the
varnish at a solid content of 65% by volume.
This resin was applied to a 7628 type (ICP grade) glass cloth with a resin content of 40% by
weight, dried, and semi-cured to prepare a prepreg for a glass woven fabric base epoxy resin
sheet.
[0033]
Next, a honeycomb core (made by Jamco, thickness 4 mm) obtained by impregnating nomex
paper with a phenol resin is prepared, and the prepreg is used to seal the hollow portion of the
honeycomb core at both ends of the honeycomb core. And press for 65 minutes at a temperature
of 160 ° C. and a pressure of 2 kgf / cm <2> to heat and cure the prepreg to obtain a glass
woven fabric base epoxy resin sheet, and this sheet and the honeycomb core I was glued.
[0034]
The thickness of the honeycomb core after pressing is 4 mm, the thickness of the glass woven
fabric base epoxy resin sheet formed from the prepreg is 0.19 mm, and the thickness of the
honeycomb core is the glass woven fabric base It was about 21 times the thickness of the epoxy
resin sheet.
[0035]
Next, the laminate obtained by press molding as described above is cut into 300 mm × 420 mm
to obtain a target diaphragm, and one NTX exciter is attached to the surface to transmit an audio
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signal. Function as a diaphragm of a flat speaker.
In order to drive the speaker thus obtained, TA-55 manufactured by BOSE was used as an
amplifier, and D-FJ787 manufactured by Sony Corporation was used as a CD player.
Moreover, the characteristic evaluation of the said flat speaker was taken as average evaluation
of several test persons.
[0036]
The main physical property values of the obtained flat speaker are shown in Table 1, and the
results of the characteristic evaluation of the flat speaker are shown in Table 2.
[0037]
(Example 2) Instead of the glass cloth of 7628 type (ICP grade) in the above prepreg, using 1080
type, the thickness of the honeycomb core is 1.5 mm, and the thickness of the woven glass
substrate epoxy resin sheet is 0.07 mm A diaphragm of the flat speaker was manufactured in the
same manner as in Example 1 except that the flat speaker was manufactured from the
diaphragm.
Further, in the same manner as in Example 1, the characteristics of the flat speaker were
evaluated. From the above values, the thickness of the honeycomb core was about 21 times the
thickness of the woven glass substrate epoxy resin sheet.
[0038]
The main physical property values of the obtained flat speaker are shown in Table 1, and the
results of the characteristic evaluation of the flat speaker are shown in Table 2.
[0039]
(Example 3) In place of the glass cloth of 1080 type (ICP grade) in the above prepreg, 2116 type
is used, and the thickness is set to 0.1 mm of the woven glass substrate epoxy resin sheet in the
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same manner as in Example 2. The diaphragm of the flat speaker was manufactured, and the flat
speaker was manufactured from this diaphragm.
Further, in the same manner as in Example 1, the characteristics of the flat speaker were
evaluated. From the above values, the thickness of the honeycomb core was about 15 times the
thickness of the woven glass substrate epoxy resin sheet.
[0040]
The main physical property values of the obtained flat speaker are shown in Table 1, and the
results of the characteristic evaluation of the flat speaker are shown in Table 2.
[0041]
(Example 4) A diaphragm of a flat speaker is manufactured in the same manner as in Example 2
except that the thickness of the honeycomb core is 10 mm and the thickness of the glass woven
substrate base epoxy resin sheet is 0.10 mm. The flat speaker was produced from this
diaphragm.
Further, in the same manner as in Example 1, the characteristics of the flat speaker were
evaluated. From the above values, the thickness of the honeycomb core was about 100 times the
thickness of the woven glass substrate epoxy resin sheet.
[0042]
The main physical property values of the obtained flat speaker are shown in Table 1, and the
results of the characteristic evaluation of the flat speaker are shown in Table 2.
[0043]
Comparative Example 1 The same procedure as in Example 1 was repeated except that glass
cloth 106 typr (28 g / m <2>) was used.
[0044]
Comparative Example 2 The same procedure as Example 1 was repeated except that glass cloth
7635 typr (233 g / m <2>) was used.
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[0045]
Comparative Example 3 The same procedure as in Example 2 was performed except that a glass
cloth 7628 type was used and the honeycomb core was 10 times as thick as the prepreg.
[0046]
Comparative Example 4 The same procedure as in Example 4 was repeated except that 7635
typr (233 b / m <2>) was used.
[0047]
[0048]
[0049]
As described above, as apparent from the examples and the comparative examples, it can be seen
that the flat speaker manufactured using the flat speaker diaphragm of the present invention is
excellent in efficiency, directivity and frequency characteristics.
Therefore, it can be seen that according to the present invention, it is possible to provide a flat
speaker in which sound quality such as directivity and frequency characteristics is sufficiently
improved.
[0050]
As mentioned above, although the present invention was explained in detail based on the abovementioned example, the present invention is not limited to the above-mentioned example, and
various modification and change are possible unless it deviates from the category of the present
invention.
[0051]
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It is a block diagram which shows an example of the diaphragm for flat speakers of this
invention.
Similarly, it is a block diagram which shows an example of the diaphragm for flat speakers of this
invention.
Explanation of sign
[0052]
10 honeycomb core 10A hollow portion of honeycomb core 20 glass woven fabric base epoxy
resin sheet t1 honeycomb core thickness t2 glass woven fabric base epoxy resin sheet thickness
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