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JPS5932292

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5932292
[0001]
The present invention relates to a loudspeaker, and more particularly to a flat loudspeaker
having a sandwich disc or a polygonal flat plate h, and an improved coupling between a
diaphragm and a voice coil bobbin. FIGS. 1 and 2 are cross-sectional views showing examples of
planar speakers using a conventional disk diaphragm. In each figure, 1 is a disk diaphragm, 2 is a
voice coil, 2 'is a voice coil bobbin, 3 is an edge, 4 is a centering spider, 5 is a drive cone, 6 is a
magnetic circuit, 7 is a frame supporting them, 8 is a frame The adhesive is used to bond the disc
diaphragm 1 and the voice coil bobbin 2 'or the drive cone 5). As described above, one of the
features of the flat speaker using the disk diaphragm 1 is that by driving the node circle of the
resonance mode of the disk diaphragm 1 (referred to as mode driving or node driving), the
higher order The reproduction band can be expanded to resonance. FIG. 1 shows a method of
driving a voice coil bobbin 2 'by bonding [2] directly to the nodal circle (node) portion of the
primary resonance mode of the disk diaphragm 1 (a direct driving force system 2) is a method
(referred to as a drive cone system) of driving by -C through a drive cone 5 between the disk
diaphragm 1 and the voice fill bobbin 2 '. In general, the resonance frequency fr of the disk
diaphragm 1 which drives the node circle is expressed by: Disc shake! 1 ′ ′ 11 plate 1 to
increase bending rigidity I) and to reduce σ for surface density I / i7, generally 6th h C C (5 f f
ザンII
チ ら L) L . Here, a and a 'are skins or faces, and l] is a core. For the surface materials
a and a ', generally, aluminum, plastics, foils such as i ′ ′ RP or' N plates are used, and for the
core material, aluminum, plastic, paper or the like is formed into a honeycomb shape, Foamed
plastic, light alloy Δ (gutter is used. Surface materials a and a 'and core materials h) (' j,-glued to
the crotch with adhesive C to form a panel to form a panel) as is well known. 1 and 2 both
contact of the disc diaphragm 1 and the voice coil bobbin 2 'or the drive cone 5 with the mold
indochi structure and the surface a' of the rear side of the lean ditch structure. + Ili 5 J "(: has
been done. Here, looking at the transmission of the driving force to the above-mentioned speaker
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1,;)), the driving force F generated by the signal current applied to the voice coil 2 is ↑ d in FIGS.
1 and 2. It is transmitted to the disc diaphragm 1 via the bin 2 ′ or the drive cone 5.
However, since the disc diaphragm 1 has a sanded inot structure as described above, the driving
force F is first transmitted to the surface a of the disc diaphragm 10, and further through the
adhesive C1 core material b and the adhesive C '° C. It is transmitted to the surface moon a. For
this reason, the driving force F causes a loss of 4 heads by the adhesives C and C 'and the core
material. That is, in the sandwich structure, the materials of the core material are often different
from the surface materials a and a ′, and therefore the propagation velocity of the vertical wave
(sound wave) between the surface material a-a ′ and the core material Sound wave) VC
difference))). In general, the core material has a slower sound velocity and a larger internal loss.
Furthermore, in order to increase the bending rigidity I), the thickness of the core is often
increased, so the phase difference between the surface material a 'and the surface material a
causes a difference in amplitude. For this reason, the disc diaphragm 1 does not vibrate
uniformly. As described above, the bonding between the disc diaphragm 1 and the voice coil
bobbin 2 'or the drive cone 5 is strong when the surface material a' and the voice coil bobbin 2
'or the drive cone 5 are bonded with the adhesive 8 when viewed locally. In the case of the entire
diaphragm, it is only a lossy flexible connection. This is particularly noticeable when a foamy plus
deck is used as the core material. For this reason, the flexural rigidity of the disk diaphragm 1
can also be small, and the resonant frequency fr is also low. In order to eliminate the above
drawbacks, the inventor of the present invention has proposed and already filed two bonding
methods described next. That is, according to the first method, as shown in FIG. 4, a plurality of
slits 9 penetrating the surface materials a and a 'and the core material are provided in the inside
of the disk diaphragm 10 node, while FIG. As shown in FIG. 2, the top portion of the voice coil
bobbin 2 'for transmitting the driving force F is provided with a projection (tongue) portion 10,
and this projection 10 is passed through the slit 9 provided in the disk moving plate 1 and
bonded with an adhesive 11. It is A cross-sectional view of a speaker to which this method is
applied is shown in FIG. Also, the second method is an improvement plan of the above-mentioned
first method, and it is noted that the circular through hole is easier to process L- than the
elongated slit 9, and as shown in FIG. A plurality of through holes 12 are provided inside the
plate 10 section U, and then a plurality of pipes 13 (or pins) made of light alloy or plastic are
passed through the vocal tract holes 12 and the disc diaphragm 1 And the voice coil bobbin 2 '. A
cross-sectional view of a speaker to which this method is applied is shown in FIG. By two joining
methods, the driving force can be uniformly transmitted to the entire disc diaphragm 1, and the
surface rigidity 3.3) is six, so the bending rigidity I) also has a large value / f As compared with
the conventional bonding force method shown in FIG.
However, these 11 methods have seven disadvantages that are described below. In the first
method, it is difficult to provide a plurality of thin slitting slits 9 in the disk diaphragm 1
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according to the first method. (B) The shape of the Bo-Isco-Ill bobbin 2 'is complicated (to make it
tail and reduce the thickness of the bobbin 2' for achieving a lighter M, the thickness of the
bobbin 2 'is less than 4). If it is inserted into and fitted into, it will tend to cause deformation
damage (λ. When the gap between the slit 9 of the disk diaphragm 1 and the protrusion 10 of
the voice coil bobbin 2 'is large, the adhesive 1171-multiplexes, and the row level decreases. B)
through the slits 9Gi of the disk diaphragm 1, the projection 10 of the voice coil bobbin 2
'protrudes, and the adhesive 11 is applied, which is not preferable in design. And the second
method-c b: t (i) the number of parts increases. (B) Like the first method, the design is good: l 1.
<Lx There was a defect such as The object of the present invention is to eliminate the abovementioned drawbacks of the prior art and increase the resonance frequency fr 4 by using the
disk diaphragm and the voice coil bobbin 01xγ (improvement of the characteristics and
moreover the structure is in the cylinder 4, production 1 ′ ′ ′ ?: Easy, and well-designed,
good speaker. As described above, the driving force F generated by the voice coil 2 is
simultaneously and uniformly transmitted to the whole (surface material a, a 'smooth and core b)
corresponding to the inside N of the disk diaphragm 10 In the present invention, in the present
invention, the surface of the radiation surface of the row wave is formed on the inside of the disc
diaphragm 10, N1 inside the disk diaphragm. A plurality of non-penetrating holes are provided,
and the holes are filled with an adhesive alone, or an adhesive with a mesh (reinforced moon), or
an adhesive mixed with carbon fibers, short fibers such as whiskers, hollow spheres, and the like.
It is characterized in that the voice coil bobbin is bonded and joined, and the voice coil bobbin
and the surface material and the core material of the lean germane structure are integrally
bonded. Hereinafter, an embodiment of a loudspeaker according to the present invention will be
described using the drawings. FIGS. 9 and 10 show the direct drive speaker shown in FIG. 1 in
which the present invention is applied 17 but the main portion (a perspective view showing the
configuration and a portion showing the details of the cross section It is an expanded sectional
view. This is due to the use of a high frequency speaker with a diameter of 28 rnn ·) of the disk
diaphragm 1). This disc diaphragm 1 has a sandwich structure in which the surface material a = a
′ is filled with aluminum alloy foil t = 127 ffn and the core material is a foamed acrylic resin
plate, and the thickness i of the disc diaphragm 1 2 FIL.
In the case of production, as shown in FIG. 9, first, provide a plurality of non-penetrating holes
14 (approximately 8 to 16 wedges are desirable) on the node N of the disk diaphragm 1. True! In
the previous example, as shown in FIG. 10, a hole 14 having a shell-shaped cross section is
provided using an insect pin (about 0.7 wL in diameter). Then, an epoxy-based adhesive 15 is
injected into the hole 14, and the adhesive 15 is further applied onto the interior N of the joint,
and then the voice coil bobbin 2 'is connected thereto to form a contact II m @ -f. As is apparent
from the above embodiment, according to the present invention, the drive caddy generated by
the voice coil 2 does not lose inside the disk diaphragm 10 node N without loss of rock January a
', core material l), Since the shear stress is less likely to be exerted because the whole of the nonsections r9 is uniformly bonded to the surface material a at the same time simultaneously, the
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bending rigidity is also shown in FIGS. 1 and 2 as in the prior art. A large value can be obtained
compared to that of the scheme-as a result the resonant frequency fr is lined up. Furthermore,
the voice coil bobbin 2 'is entirely VC bonded to the inside of the disc diaphragm 10 by the
adhesive 15), and this adhesive 15 has a wrinkle effect on human beings in the core material.
Since (anchor effect) is increased. V), the bonding strength between the disk diaphragm 1 and the
voice coil bobbin 2 'is improved and the allowable input of the entire speaker is also improved.
The frequency fluctuation is shown in FIG. 11 as a representation of these effects. In the figure, d
is the frequency characteristic of the high-tone speaker of the configuration shown in FIG. 1 of
the conventional system, and e is the frequency characteristic obtained by the configuration of
the present invention. The resonant frequency fr of the deaf person is increased by about 101%
compared to the former. Furthermore, when 30 to 60 pieces of short cut carbon fibers are mixed
in the adhesive 15, the resonance frequency E! Ifr increased by 5% to 15%, VC increased
tolerance by 30 to 50%. In the above description of the present invention, the case of the disk
moving plate has been described and clarified, but the present invention can be applied not only
to the disk (flat disk) diaphragm but also to a speaker having a flat diaphragm using a flat plate.
You can get the same effect. As described above, according to the present invention, in the planar
speaker having the diaphragm of sandwich structure, the resonance frequency fr can be
increased, and the adhesion between the diaphragm and the voice coil bobbin can be improved.
There is no increase in the number of parts, and it is easy to manufacture, and it is possible to
carry out this without having a single master of 7 generations.
[0002]
Brief description of the drawings
[0003]
1 and 2 are sectional views of a flat loudspeaker using a conventional disk diaphragm. 'l', R [Zero
1 shows Santoy l-Cyclic disassembly of the disk diaphragm 1 Fig. 4t Fig. 4t [Iris 8] shows a
modified example of the iIr from the flat type l) FIG. 9 is a perspective view showing a four-part
configuration of an embodiment of the speaker according to the present invention, FIG. 10 is a
partially enlarged sectional view showing the main (σ) details of the embodiment, FIG. The
figure is a high-tone speaker with a disc diaphragm, wood 1) (4 kJ-, I 1 l and the sound pressure
circle of the one according to the prior art) + 1 Flr?
FIG. 6 is a characteristic diagram showing comparison E of E. Explanation of symbols 1 · · · Disc
diaphragm 2 · · · · · · Boyce coil 2 '· · · voice coil bobbin 14 · · · hole 3 Figure O' η T4-Figure! T 5
Figure 7'l Figure 1? ! 0 figure 11 figure 4 liquid bowl (ni /-/ X) 60 1
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