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DESCRIPTION JPH01289398

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DESCRIPTION JPH01289398
[0001]
[Industrial field of application] The present invention relates to the anti-vibration measures of the
respective parts in this invention speaker system. [Prior Art] Essentially, sound waves emitted
from a speaker device. It should be radiated only from the vibration system, and it is preferable
to use a small unnecessary radiation sound small sword that contains a lot of resonance noise of
each part of the cabinet or interior bass reflex boat or the interior speaker unit. Therefore, in the
conventional speaker device, various means are adopted to cancel the resonance sound in the
above-mentioned respective parts, but the means are individually different and diverse.
[Problems to be Solved by the Invention] As described above, the anti-vibration measures light of
each part in the conventional speaker device is individually performed for each part, so that it
takes time to select the material to be used and its implementation. There is a problem. An object
of the present invention is to use a common anti-vibration material having high reciprocity and a
large internal loss as a constituent material of each part generating unnecessary radiation prior
to solving the above problems. [Means for Solving the Problems] In the speaker device of the
present invention, an Al-Ni alloy containing 4 to 10% by weight of Ni or an Al-E3i3j system
containing 8 to 20 'Xfi% of 81 is used. The whole configuration of each part of the speaker
device is made up of Zn. [Operation] The above-described vibration-proof aluminum alloy is used
as a constituent material of each part generating unnecessary radiation before in the speaker
device of the present invention, so the respective parts themselves are maintained at high side
and inside The losses can be increased to reduce the occurrence of unwanted radiation from
each. An embodiment of the present invention will be described below. That is, in FIG. 1 (a) (b), fli
is the same material as the vibration-resistant aluminum alloy (the cabinene of this invention eua)
composed of an Al-Ni-based or Al-Si-based). The baffle plate of (1b) is a backboard that forms the
rear surface, which is also made of the same material. +21 is a speaker unit for low-pitched
interior that is mounted airtight on the above baffle plate (1a). (3) is a speaker device for high-
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pitched sound, (41 is the above-mentioned baffle plate (jaJ K provided through-hole), (5) is an
interior bass reflex boat in which one end is inserted and bonded to this through-hole. It is
comprised with the same vibration-proof aluminum alloy as the said cabinet (1). Next, the
composition of the vibration-proof aluminum alloy used in the cabinet and bass reflex boat of the
present invention is shown by weight percentage. Examples (11 and 2) are Al--Si alloys, and
Examples (3) and (4) are Al--Ni alloys.
(Example 1) (Example 2) (Example 3) (Example 4) Sj 10% 8110% N 16% Ni 6% Fe O, 05% Pe Q,
05% Fe 0.05% Fe O 05% zro, os% Zr C 105% Zr O, 05% Zr O, 05% MM 0.1, M MM, 1% MM O, 1
relationship MM 0.1% Na Q, 002% 8 n 1 L 08% l 'R r an 0 .08% Al residue hi residue AJ
Remaining "MM" in the above each example is a metal, and its composition is La 35%, 0043%.
The cause and mechanism of damping ability of the vibration-damping aluminum alloy of the
present invention described above where IJal is 5%, Pr 4%, Sm 1%, Y and others 2% are the
boundary between second phase particles and matrix, grain boundary and Viscous flow at cell
grain boundaries and absorption of vibrational energy by micro defects in crystals such as
dislocations, pores and stacking faults are considered. (The above-mentioned damping ability Ql
indicates a scale for converting externally applied vibrational energy into thermal energy. E: At
the beginning of one cycle of micromotion, vibration energy ΔE of the vibration system is
represented by energy converted to thermal energy during one cycle of imaging. That is,
according to the embodiment of the present invention (11 (Al--Si alloy shown in 21), when si 'is
added to Al, 81 particles are precipitated in Al which is a matrix, and all eutectic crystals are
formed. The interface of the 81 particles, which is the second phase, absorbs the vibration and
improves the damping capacity ct I f. Also, Fe, Zr # V * T1 and rare earth elements work to refine
the crystal and increase the grain boundaries, and Na and Sr work to refine the sl particle. When
s, 1 is contained as in the above Example (2). This finely precipitates at the grain boundaries,
increases the agility of the two grain boundaries, and improves the damping ability. In the above
examples of the present invention (the preferred individual ranges of each component in rl (21
(weight percentages are as shown in Table 1 below, and more or less than the following It causes
such problems. No. L 7 cold 5 or 1 Example of the present invention (in the case of 11 (Al-E11
heavy metal of 21), the average particle diameter of the second phase particles (84 particles) is
10 μm or less in the crystal structure Preferably, by setting the thickness to 10 μm or less, the
interface of the second phase particles can be increased, and a large damping ability can be
obtained. Furthermore, the average particle diameter is preferably 7 μm or less, more preferably
5 μm or less.
Moreover, when Ni 2 is added to 1 M of the Al-Nj-based alloy according to the above-described
embodiment (31 (41 (41), Ni particles are precipitated in Al as a matrix to form a eutectic
structure. Then, the interface of the second phase, Al3N1 particles, absorbs the vibration to
increase the damping capacity Q-1 @. Also, fc'e * zrev + Ti and rare earth elements are used to
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refine the binding at to increase the grain boundaries and to equalize the damping ability Qif.
Furthermore, as in the above example (4). When Sn is contained, it finely precipitates at grain
boundaries to increase the total viscosity of the two grain boundaries and improve the damping
capacity Q-1. The preferred range (weight 5: percentage) of each component in the above
Example + 31 f 41 of the present invention is as shown in Table 2 below, and more or less may
result in the following R. In the above embodiment of the present invention (in the case of 31
(the Al-Ni alloy of 41, the particle diameter of the second phase (Al3N1 particles) is preferably 10
.mu.m or less in the crystal structure, preferably 10 .mu.m). By setting the following, the interface
of the second phase particles can be increased, and a large damping capacity can be obtained.
The average particle diameter is more preferably 7 μm or less, still more preferably 5 μm or
less. Next, the comparison of the Al-Ni alloy of the present invention, the Al-8i alloy with Al (ADO12), and zn-Al gold alloy (trade name: Cosmar 2) is shown in the following [Table 3]. J-11:
Whitening As is apparent from Table 3 above, the damping capacity Q is 1 larger than that of the
Al-Ni alloy of the present invention and Al-134 alloy, compared to AlJADC- + 2). Since the relative
modulus of elasticity is slightly inferior to the range which does not cause any problems, the
internal loss of the cabinet and bass reflex boat can be made much higher than that of the
conventional product without lowering the stiffness, and as a component material of the cabinet
and bass reflex boat. It turns out that it is very good. Recently, zn-Al alloy (trade name: Kosmar 2)
has attracted attention, but the damping ability of the Al-Ni alloy and the Al-8i alloy of the
present invention is greater. The specific elastic modulus B / p 6 (cd / 5 eo 2), which is
proportional to the propagation speed, is also larger in the Al-Ni alloy and the Aj'-81 alloy. The
low specific gravity makes it possible to provide a light and rigid cabinet and bass reflex boat.
The above-mentioned Zn-Al alloy has a problem in corrosion resistance as compared with A7 '(A,
DC-12), the Al-Si alloy of the present invention, and the Al-N1 alloy.
The concept of the cabinet in the present invention includes the illustrated backboard (1b), and it
goes without saying that the same Al-Ni alloy or Al-8i alloy can be used for this backboard. The
foregoing has described the invention in detail in the case where the sources of unwanted
radiation are a cabinet and a bass reflex boat, but will be described below with respect to other
sources. Just as FIG. 2 shows the anti-vibration aluminum described above as the constituent
material of the bank cover (7) which forms a cavity for filling the sound absorbing material (A)
on the back of the pole piece (6) in the speaker unit 2. An alloy is used to increase the internal
loss while giving high rigidity to the back cover, thereby suppressing the radiation of
unnecessary vibration from this part, and in the other figures, (8) is the tack / (91 is a mounting
screw for the above-mentioned bank cover, (ILI is a magnet, αB is a play), (L5 is a diaphragm
2α3 is a diaphragm, θ4J is a damper). The conventional back cover is made of synthetic resin
from aluminum. FIGS. 3 (a) and 3 (b) show the diaphragm a3 of the dome-shaped and hornshaped speaker units provided with a protective cover 09 from the external force that covers the
diaphragm a3. The protective cover is made of an alloy to increase its internal loss while making
the protective cover highly rigid, thereby suppressing the radiation of unwanted vibration from
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this part. This protective cover has a wire mesh shape as shown in FIG. As shown in FIG. 2, a
punched metal-like one 2 as shown in FIG. 3 may be an exci-band metal-like one, or as shown in
FIG. In the other figures (15a) is an adhesive for the peripheral portion of the protective cover
05. σe is a yoke, aη is a spacer, α is a support ring of the protective cover α9, fi9 is an
equalizer, and ■ is a back cover. The conventional protective cover is made of aluminum or
synthetic resin. FIG. 4 shows that the horn Qυ used for the horn-type speaker unit is made of the
above-mentioned vibration-proof aluminum alloy, and the internal loss is increased while
maintaining the rigidity of the horn itself. A radiation suppressing system, aluminum, synthetic
resin or wood was used on a conventional horn. FIG. 5 shows that the above-mentioned ring
made of anti-vibration aluminum alloy is fitted and adhered to the outer periphery of the pole
piece portion (6) of the magnetic circuit in the cone-shaped speaker unit through an adhesive
(22a). This ring is intended to absorb an AC magnetic field according to the voice signal
originally generated from the voice coil and to reduce the adverse effect due to this.
Conventionally, all aluminum is used, but in the case of the present invention, Since the vibrationproof aluminum alloy is used, the vibration-proof effect is particularly large, whereby the
vibration of the magnetic circuit is suppressed, and the unnecessary radiation sound radiated
through the 7 lam side is reduced.
Fig. 6 is a voice coil bobbin 2.4f in a cone-shaped speaker unit, which is made of the abovementioned vibration-proof aluminum alloy to make the voice coil bobbin highly rigid while
increasing its internal loss to radiate unnecessary vibration from this portion. The heat resistance
and moisture resistance are improved. In the conventional voice coil bobbin, paper, aluminum or
synthetic resin is used. FIG. 7 describes the weight ring @ inserted and adhered to the diaphragm
side end of the voice coil bobbin @ in the cone-shaped speaker unit as described above and made
of the following anti-vibration aluminum alloy to increase its internal loss. Along with
suppressing the radiation of unwanted vibration from this part. It is intended to improve heat
dissipation from the voice coil. Conventional weight rings are made of ethylene butadiene rubber
or aluminum. Fig. 8 shows equalization f-CI of one speaker unit. 1 and the frame αa of the other
speaker unit and a common baffle plate (1a) on which they are mounted? Composed of the
above-mentioned vibration-proof aluminum alloy. While keeping the whole of these as rigid as
possible. The internal loss is increased to suppress the radiation of unnecessary vibration from
these parts, and the molding operation and its installation are intended to simplify the operation.
The above mentioned equalizer may be an acoustic lens. The conventional frame was made of
aluminum and the equalizer was made of aluminum or iron. Fig. 9 shows cabinets. (11) The
radiation fins (mostly) polymerized and fixed to the backboard (1b in 11) are made of the abovementioned antivibration aluminum alloy, and their internal loss is increased to make the bank In
addition to suppressing the radiation of unnecessary vibration from this part including 9 The
conventional heat dissipating fins are made of aluminum. As described above, the speaker device
of the present invention generates unwanted radiation. The Al-Nj alloy according to the present
invention having high rigidity and large internal loss fc as a constituent material of each portion
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uses a vibration-proof aluminum alloy which is an Al-Bi alloy, so that a predetermined rigidity is
maintained. However, it is possible to increase the vibration isolation effect in each of the parts,
and to effectively suppress the generation of the unwanted radiation sound from each part of the
apparatus with a particularly common material.
[0002]
Brief description of the drawings
[0003]
1 (a) and 1 (b) are a vertical sectional view and a front view showing the speaker device
according to the present invention, FIG. 2 and FIG. 3 (a) (1)) H Vertical showing the main part of
the speaker unit according to the present invention Sectional view, Fig. 3 cl, Q2, 05, (14 is a plan
view of the protective cover of the invention. Fig. 4 is a sectional view of the horn of the
invention, and Fig. 5 is an attachment of the ring for absorbing AC magnetic field of the invention
6 is a vertical sectional view of the speaker unit showing the voice coil bobbin of the present
invention, FIG. 7 is a vertical sectional view of the speaker unit showing the mounting state of the
weight ring of the present invention, FIG. FIG. 8 is a vertical cross-sectional view of the speaker
device showing the formed state of the equalizer of the present invention and the frame, and FIG.
8 is a perspective view of the speaker device showing the attached state of the radiation fin of
the present invention. .
I6 in (11 is a cabinet, (1a) is a baffle plate. +21#″CCスピーカーユニツト5)はバスレフボ
ート。 (6) pole piece, (7) puncture cover, α2 frame, αJ diaphragm, (15 protection cover, a9
equalizer, on horn, @ ring, ■ voice coil, QQ voice A coil bobbin, (iii) is a weight ring, and (ii) is a
heat radiation fin. In the other figures, the same-reference symbols denote the same or
corresponding parts.
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