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The present invention relates to a speaker sliding plate that is lightweight, has high bending
stiffness, and contains excessive mechanical loss. Loud ij in the speaker It is required that K,
which plays a good sound, be able to move in a viscose motion over a wide-dust band as much as
possible. Therefore, it is desirable that the light and hardness of the Krj% shaking plate is higher
and the bending rigidity is larger. P! In order to reduce the peak sharpness of the colliding
point t of the speaker * #) Internal loss of rcsi & ll * 方 It is preferable to have a moderately large
core. Each diaphragm with a laminated structure has been proposed with certainty, but as its
surface material, metal foils such as scissors, a / I / minium foil, etc., pares a, at fat films, high
elastic delicate 1 repregs A v-t was used. The performance of the laminated structure OS moving
plate is such as Daikichi (it is affected by what it is used for the surface material), so the warp
selection is 1 tatami. It is required to have light and appropriate internal loss at the same time as
the performance of such a skin material, the performance of the peristaltic root, and the size of
the rigidity such as the strength (elongation ratio and tensile strength) and the like. However,
among the above-described surface materials, the rigidity of the 4 to 1 paper and the resin film is
insufficient, and metal foils such as A / minium can satisfy U at the rigid surface, but the density
is high at 1% with fhO The peak at the co-superior point tends to be thick (it tends to be dull
because the internal loss is large and 1 compared to other skin materials). In addition, the highly
elastic and delicate prepreg V- is not satisfactory in processability in terms of wrinkles (and cost
is high), etc. The present invention applies. In view of the above point, the present invention
provides a speaker vibration & having a foam 111 fat as a core material and an S / -like material
as an aromatic llyamide fiber alt main component bonded to at least one side of the core. It is a
thing. FIG. 1 The (each shows a different embodiment of the speaker diaphragm of the present
invention. Fig. 2) shows a circular plate gjilII Eil plate, and the figure @ shows the two-sided
motion of a conical bowl & 1-. Each one is shown. In these figures, (1) a core material made of rj
urethane foam, and (2) a skin material made of an aromatic polyamide sheet stuck together with
a double-sided K 111 adhesive of the light a core material (1). is there. As described above, the
aromatic polyamide sheet used in the outer cover material 1 of the diaphragm according to the
present invention has mum such as poly (m-71 = renisoataramide) as a main component, to
which a small bonding molecule tube is added. It is obtained by making a paper with a paper
machine. And if heat-calendering processing is applied to this sheet, a fist giving high strength as
needed can be made.
Such an aromatic polyamide sheet [a binder is Nomex Aramened Paper, a trade name of
Deeboshi. Physical properties of the sheet-like material (hereinafter referred to as "Nomex sheet")
formed by the Nomex-alamidide paper ta. Aluminum foil and that of kraft pulp W & are as shown
in the following table. As clear from the above table, Nomex sheet has a large Young's modulus
but a high internal loss despite the large% thK% 1 Daikichi-so Iv11 l as a surface material (2)
compared to Aiv Mi foil or kraft pulp 9 or high heat resistance temperature 2200, tensile 9I! 1) It
has excellent properties such as bending, bending 1) toughness and dimensional stability, so that
molding and pasting 9 can be carried out very easily and it has an advantage such as φ which
does not change with time. ing. Next, a specific application example of the circular plate swing &
according to the present invention shown in FIG. 1 (IL) K will be described. First, WtFIO, 055 f //
d, thickness 9 Hty) urethane foam Th [11865 w in the form of Fj & was cut to obtain a core
material (1). Then, an inner surface of this core material (1) is formed into an inner shape with a
thickness of 140 μm and an area density of 0.012 f / d 0.012 f / d, and a surface material (21 trubber liquid W! The adhesive was diluted after application to a thin solution of 'gI. The circular
plate vibration and crane according to the present invention thus obtained is measured at its
resonance frequency 'using the eigenmode method as shown in FIG. In other words, 1) The Ospeaker) is placed opposite to the cone-shaped vibration & 牡), and the flat plate 1 is squeezed,
and its periphery is held by the flexible flux $ 1 1 SI 3)) Drive (S). According to this, the sound
pressure generated from this speaker 6) is upper note m1! Shake the moving plate). When the
primary resonance (which produces a primary nodal circle) frequency of the flat plate diaphragm
at this time is detected by the acceleration pickup 0 attached to the middle portion KXSI of the
flat plate diaphragm, the primary resonance station number fr is fr = 600H2. there were. The
radius of the flat plate diaphragm of the first circle is R, and it is expressed by the following
equation (1). The curvature of the Di diaphragm is rigid; Direction of the direction of @ @ degree
λ · Constant of the resonance mode (1st order of the circle and 1! aλ ′ ′ = 9.08) Next, for the
sake of comparison, the material and dimensions of the foamed urethane material of the core
material were completely the same as above, and 1 skin material was changed to aluminum foil
and Kura 7 Toba lVfV In order to make the flat diaphragm of the case t, and make the whole
surface area of these flats and vibrators the same as the surface density when using the previous
Nomex, the surface density rj 40 μm of aluminum foil, kraft bar That of the / I / 1 paper was
200 μm.
Resonant frequency of these planar peristaltic plates? Measured according to the method of W
(Iim 7-do method), it is tjf'r = 650 Hz with a diaphragm using A / & / M foil and Hfr = 400 Hz
with a diaphragm using Kura 7 Toba lVf 歇there were. From these results, the physical properties
of the upper e.sup. * For Inukakura% / h.sub.1 flat screen are calculated as follows. The
frequency characteristics of the speaker V * as shown in FIG. 6 and the frequency characteristics
of these are shown in FIG. 4 using three circular flat diaphragms like a blank period. ! ! In FIG. 3,
Cx) rr is the various flat diaphragms described above, and the @ diameter is 186 N at all.
(Magnetic circuit of external magnet type using 31H cage-like magnet, (4) is 7 rounds of circle
ill1 type stamped on the magnetic circuit wb (3), (5) magnetic gap of magnetic circuit (3) above A
conical K 111 body connected to a voice coil bobbin (6) disposed in the (1), and one end of its
inner shape is centrically connected to the above-mentioned circular flat & vibration & light). In
addition, it is a concentric position of about 68% of the diameter of the circular flat diaphragm
with this indiction bond position mu. (7) is a surface portion made of a flexible material which
flexibly connects the peripheral portion of the upper plate vibration plate) to the opening side of
the first frame (3). In the 4th tl AK ik-, the dormitory line used as a surface covering material, 1
nomex and-), and the break Il used a shaking motion using Kufu 7 top paper, an alternate long
and short dash line aA / minium foil It shows a large frequency response 1 repetition depending
on Nades Yoko. As is clear from the figure, the nubika tweezers according to the present
invention, which is 1 kQ in size, is a nome lx シ -si, and has a high-frequency extension compared
to that used in the Kraft Paris 1 paper tube. The peak of the high-frequency resonance is
considerably suppressed as compared to that using the alv-minium foil. Invention 42. As is
apparent from the description of the sliding plate for a speaker, as described above, since a skin
material containing aromatic polyamide short and delicate portions as a component is bonded to
a core material of glutinous foam 11 fat, Table J : Flattening can be achieved along with the
broadening of the frequency characteristics depending on the strength of the flexural rigidity of
the il material and the appropriate internal loss. In addition, due to the good mechanical
properties and dimensional stability of the skin material to be cut, it is possible to realize at low
cost a speaker diaphragm that is easy to form and has only a% Kjk change.
Brief description of the drawings
Fig. 1 (t) ff A cross-sectional view of a different embodiment of the speaker 1ii pivot according to
the present invention, @ 2 is a method for detecting the resonant frequency of the 壷 ll Ih plate tlayout for explaining FIG. 5 is a cross-sectional view of the speaker (t), and FIG. 4 is a
characteristic view of iIi (d) company company D) CX) [flat plate diaphragm, (114 d & material,
(21 rj skin material)]