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JPS6016797

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DESCRIPTION JPS6016797
[0001]
Industrial Field of Application The present invention relates to a speaker using a diaphragm such
as a flat diaphragm and having an adhesive substance omitted in the middle of a driving force
transmission member to improve sound pressure frequency characteristics in a high frequency
range. Configuration of the conventional example and its problems A loudspeaker using a flat
diaphragm (hereinafter referred to as a flat loudspeaker) is (1) flat sound pressure frequency
without a front room effect as compared to a loudspeaker using a conventional cone paper
Characteristics can be realized. (2) The piston vibration region of the diaphragm is wide, and it is
possible to reduce the distortion in a wide band. (3) It is expected that the position of the sound
box when the several units of several gardens can be divided into the baffle is excellent in nine
phase characteristics on the same plane, and it has the characteristic of the box and will be the
mainstream of future speakers It is done. In order to realize a wide band with a flat plate speaker,
it is necessary to expand the piston vibration region to a high-order divided vibration frequency
by driving a node of the low-order divided vibration of the diaphragm. However, since it is
necessary to use a plurality of voice coils or to use a large diameter voice coil in order to drive
the divided vibration node, it is necessary to use a plurality or a large magnetic circuit, and While
the weight of the vibration system increases and the efficiency decreases, it has the problem of
becoming expensive. FIG. 1 shows the main part of a conventional speaker. In FIGS. 1a and 1b, 1
is a circular flat diaphragm, and the circular flat diaphragm 1 has a nodal circle 2 due to loworder divided vibration. A coil bobbin 3 is fixed to the joint circle 2 of the flat diaphragm 1, and
the voice coil 4 is wound around the coil bobbin 3. By driving the joint circle in this manner, the
piston vibration area can be expanded. However, if the coil bobbin 3 having the same diameter as
the diameter of the nodal circle 2 is used, the magnetic circuit is enlarged. In order to miniaturize
the magnetic circuit and to drive the joint circle 2, it has been proposed to use a drive cone 6
consisting of a truncated cone as shown in FIG. On the other hand, in the sound pressure
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frequency characteristics of the flat plate speaker, (1) a peak due to diaphragm resonance at a
high order exists within the use range of 41 inches. (2) When using the drive cone drive system,
there is a problem that there is a sharp peak due to resonance of the connection between the
drive cone and the voice coil. FIG. 2 shows an example of the sound pressure frequency
characteristics of a flat plate speaker using the drive cone drive system shown in FIG. 1C. A peak
due to f20 resonance near 11 KHz and a peak due to resonance of Al 1 with a drive cone (f5ol)
appear around 18 KH2.
SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional
drawbacks and reduces the peak in the high region by utilizing the damping effect of the
adhesive to realize the flattening of the sound pressure and the vibration in the high region. The
present invention provides a speaker capable of attenuating at an arbitrary frequency or more
and simplifying a network. The present invention relates to a speaker for transmitting a driving
force acting on a voice coil to a diaphragm via a driving force transmitting member. An adhesive
substance intervenes in the middle of the driving force transmission member, thereby reducing
the peak in the high region to flatten the sound pressure and making the vibration in the high
region at an arbitrary frequency or higher. The present invention is a path from a voice coil to a
diaphragm from a pressure-sensitive adhesive excellent in heat resistance and aging resistance
with an acrylic resin-based adhesive and a silicone resin-based adhesive. Way The large pressure
resistance on the diaphragm resonance is suppressed by using the large mechanical resistance to
the force in the shear direction, and it realizes the flattening of the sound pressure frequency
characteristic and also plays the role of a high cut filter. To provide a speaker that can Examples
of the present invention will be described below. (Example 1) In FIG. 3, 1 is a circular flat
diaphragm, an edge member for supporting this flat diaphragm 1, a drive cone comprising a five
circle M [trapezoidal cylinder, and this drive cone The large diameter end 5 is adhered to the
inside of the node of the flat diaphragm 1 with an adhesive. The small diameter end of the drive
cone 5 and the coil bobbin 3 are joined by an adhesive 7. 8 is a damper for supporting the coil
bobbin 3 and 4 is a voice coil. FIG. 4 shows the sound pressure frequency 4 '! Of the loudspeaker
of this embodiment. The sound pressure frequency 'tH'lB- of the conventional example shown in
FIG. 2C is shown, and according to this embodiment, the peak of the combined pressure in the
conventional example is completely eliminated, and vKHz near 1 The typical characteristics are
obtained. (Ex. 0 example 2) In FIG. 5, 3 'is a coil bobbin whose upper end is bent to the same
slope as the generatrix of drive cone 5, and the inclined surface of this coil bobbin 3' and the
small end side of drive cone 6 The adhesive material 7 is joined with the inclined surface of.
According to this embodiment, as in the first embodiment, the peak in the high region is removed
to obtain a flat sound pressure frequency N characteristic, and according to this embodiment,
there is an advantage that the assembly becomes particularly easy. It is a thing. That is, in the
present embodiment, the adhesive substance ? is applied to the inner wall of the inclined
surface at the upper end of the coil bobbin 3 'and the drive cone 5 is simply put on the central
axis of the coil bobbin 3' and the drive cone 5 Can be matched and joined.
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Further, according to the present embodiment, there is an advantage that the same drive cone 5
can be used even if the diameter of the coil bobbin 3 'is different. The pressure-sensitive adhesive
used in Examples 1 and 2 is a silicone pressure-sensitive adhesive (Shin-Etsu Silicone, product
number KR-100) to which benzoyl peroxide (having a weight ratio of 1 to 6) is added as an
additive. In addition to the liquid adhesive as described above, an adhesive tape may be used. 0
This viscosity /? (A t-tape may be a mixture of an acrylic pressure-sensitive adhesive
(manufactured by Nippon Carbide, product number PR-115D) and a cross-linking agent 1 'ff: 50?m kraft paper or the like. As a factor which determines the damping effect of the high region
peak by the adhesive in the said Example, (1) Viscosity (cohesive force) of adhesive itself. (?
adhesion area (3) thickness of adhesive layer, (4) adhesive force between adhesive and voice coil,
drive cone, and the like). Among these, (1) and (4) are mainly determined by the construction
age, and (2) and (3) are mainly determined by the geometrical shape. In FIG. 3, h is the
application width of the adhesive 7 for joining the coil bobbin 3 and the drive cone 6, dIIS +. Fig.
6 shows the pressure-frequency characteristics of the writing pressure when d is fixed and d is
fixed. Fig. 6 V (in which A is a dog when h is a dog and B is a case where h is small, and from Fig.
6 it is clear that the bonding strength improves and the band becomes wider as the bonding area
becomes a dog is there. FIG. 7 shows the sound pressure frequency characteristics when the
coating thickness df: h in FIG. 3 is made constant and is changed. In FIG. 7, c (when 4a is small, D
is when d is a dog, and it is clear that the tensile shear strength 1 increases and the zone
becomes wider as the thickness d of the adhesive layer decreases. . As is apparent from FIGS. 6
and 7, in the present invention, the damping effect of the high region by the adhesive is the
ability to change depending on the adhesive area of the adhesive and the thickness of the
adhesive layer. By setting the value to an appropriate value, even if the same adhesive is used,
the peak in the high region can be reduced to realize flattening, and the response in the high
region can be sharply attenuated above an arbitrary frequency. Of course, an adhesive may be
used which satisfies all of the desired specifications. If the bonding area by the adhesive is
extremely small or the thickness of the adhesive layer is large, the decrease in adhesion strength,
the lack of cohesion, etc. may lead to a decrease in reliability at the time of large input, variation
or the like. Therefore, it is desirable to make the adhesive area large and to make the adhesive
layer thin as long as the required characteristics are added to l.
The above embodiments are all examples of the speaker using the drive cone 6, but the present
invention can also be applied to a speaker in which the diaphragm is directly driven by the coil
bobbin without using the drive cone. Next, an embodiment in which the entire diaphragm is
directly driven by the coil bobbin will be described. (Third Embodiment) In FIG. 8, 1 is a circular
flat diaphragm 641, an edge member for supporting the diaphragm 1, and 3 'is a coil bobbin
having a large diameter. 1) ?3 ? ? ? is a small diameter coil bobbin, and is joined to the coil
bobbin 3 ? ? with an adhesive 7. Reference numeral 4 is a voice-on-plate 8u2 damper wound
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around a coil bobbin 3 ', and in this embodiment, the same effect as that of the above example
#lli can be obtained. The two practical examples 5 are all examples of speakers using a flat
diaphragm, but the invention is not limited to the flat diaphragm, but can be applied to a speaker
using a cone-shaped diaphragm or the like. As described above, according to the present
invention, in the speaker for transmitting 411% power acting on the voice coil to the diaphragm
through the driving force transmitting member, the adhesive substance is interposed in the
middle of the driving force transmitting member. According to the present invention, the
following effects can be obtained. (It is extremely effective for damping high peaks of 1110 dB or
more, and the sound pressure can be flattened. (2) The method is simple because the adhesive
need only be applied or injected in the same manner as the adhesive. (3) The amount of the
adhesive used is very small, so there is almost no increase in weight and no decrease in efficiency
occurs. (4) Characteristic tli control is easy because the thickness of the adhesive layer, the
adhesion area, and the material of the adhesive itself and the object to be adhered can be easily
changed. (6) A filter using electrical circuit elements can be eliminated or simplified. (6) From the
above (2), (3) e (5), etc., the speaker of the present invention is extremely cost-effective, and is
excellent in performance for models requiring low price.
[0002]
Brief description of the drawings
[0003]
Fig. 1 a (l-j: Two views of the main part of the conventional speaker, Fig. 1 is the same cross
sectional view, Fig. 1 C is a cross sectional view of the main part of another conventional speaker,
Fig. 2 Is a sound pressure frequency characteristic diagram of the conventional speaker, FIG. 3 is
a half sectional view of the main part of the speaker in one real #iLi example of the present
invention, and FIG. 4 is a sound pressure frequency characteristic of the speaker of the present
invention and the conventional speaker Fig.5 and Fig.5 are half sectional views of the main part
of another embodiment of the present invention, Fig.6 and Fig.7 respectively show t's 1frequency of plating with different application states of the adhesive in the speaker of the
present invention. FIG. 8 is a half sectional view of an essential part of another example of the
present invention.
1 и и и и и и и и и и и и и и и и и и и и и и и и и и и 3. 3 ', 3 to 3 years: coil bobbin, 4 и и и и и voice coil, 5 и и и-drive
cone, 6 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и Sex substance (adhesive), 8 иииииииииииииии Danno; ?0 Agent's
name Attorney Nakao Toshio Other 1 person i1 ? il Figure @ 2 @ Gyoumaki (Hzn Figure 3
Figure 4 Zhou) Skin 1X (sz) Fig.5 Fig.6 Fig.7
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