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JPS57173496

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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 JPS57173496
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram for explaining a circular flat
diaphragm and its node driving method, FIG. 2 is a characteristic of a conventional product by
the driving method of FIG. 1C, and FIG. Fig. 4 shows the basic structure of the speaker, Fig. 4
shows the characteristics of the loudspeaker of Example 1, Fig. 5 shows the structure of the
adhesive tape used in Example 3, and Fig. 6 shows 3 of Example 3. FIG. 7 shows the speaker
assembly method, FIG. 7 shows the structure of the pressure-sensitive adhesive tape used in
Example 4, FIG. 8 shows the structure of the pressure-sensitive adhesive tape used in Example 5,
FIG. It is a figure which shows the characteristic of 5 speakers. 1,. 31 ииииии Diaphragm, 2, 32.61 иии и
и и Voice coil bobbin, 3.33.63 и и и и и Drive cone, 34 и и и и и и и и и и и и и и ..... Damper, 36 ░ 62 .....
Adhesive tape, 37 .....
[Detailed description of the invention] The origin of the tree is related to the pee force configured
to transmit the driving force acting on the voice coil to the diaphragm through the viscous and
elastic bodies, and the purpose thereof By using an adhesive tape as a visco-elastic body, it is
possible to accurately determine the gap distance of the junction in the transmission path of the
driving force to the diaphragm of the voice coil, and to obtain a speaker with less variation in
characteristics. It is to be done. In recent years, with the progress of digital audio technology
such as PCiM Dicki and DAD, the speaker is required to reproduce even 5903 degrees highspaced. Loudspeakers using flat diaphragms (flat-plate speakers) have no distortion in the sound
pressure characteristics based on the shape of the cone compared to conventional cone-type
speakers, and the piston vibration band of the diaphragm is wide and the I is low. It is expected
to be the L style of the speaker from now on with the feature said to be possible. In the flat panel
speaker, as shown in FIGS. 1a and 1b, the bobbin 2 provided with the right phrase 3 is joined to
the diaphragm 1, and the node of the primary divided vibration indicated by the broken line of
the diaphragm 1 is driven. By this, the piston vibration @ area is expanded and a wide band is
realized. Also, as shown in FIG. 1C, use of the drive cone 4 is performed to reduce the size of the
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ridge 3 of the hone ball. However, in the case of using a drive cone, there is a defect that a sharp
sound pressure peak occurs due to the second resonance f 20 of the diaphragm and the
resonance f at the root of the drive cone as shown in FIG. The Even when the drive cone is not
used (node direct drive), the peak of f20 is generated, but the height is higher than when the
drive cone is used. There is a great demand for a speaker that achieves a wide band and flat
sound pressure characteristics. The inventors have already proposed that the above peak can be
removed by bonding the connection between the drive cone and the voice coil povin with a sticky
substance. However, in the conventional method, since the viscous liquid adhesive has to be filled
in a narrow gap of about 0.2 to 4 (in the case of a speaker for medium sound), the viscosity is
insufficient and the filling becomes insufficient. On the other hand, if the viscosity is too low, it
has the disadvantage of flowing out, and it is also difficult to accurately determine the gap
interval, so that there is a tendency for variations in the characteristics to occur, and there is also
concern in reliability. The present invention solves the above-mentioned drawbacks by
processing the adhesive into a tape shape, and contributes to the improvement of the
performance of the flat panel speaker and the stabilization of the quality.
FIG. 3a shows a schematic view of a loudspeaker according to the configuration of the present
invention, and FIG. 3b shows an enlarged view of the vicinity of the junction between the drive
cone and the voice coil. The drive cone 33 and the coil base 32 are fixed by an adhesive 5926,
and the diaphragm 31, the drive cone 33 and the edge 34, and the voice coil bobbin 32 and the
bumper 35 are also fixed by an adhesive. The drive cone 33 and the voice coil bobbin 32 are
joined by the adhesive tape 36 and the adhesive 37 as shown in FIG. The adhesive tape 36 is
composed of an adhesive layer 36-1 and a base 36-2, and the driving force applied to the voice
coil bobbin 32 31 is absorbed in the high region by the adhesive layer 36-1 Plays a role in
flattening the peak ? of the An example is given and described below. (Example 1) A heatresistant tape (base material polyimide, adhesive silicone system) commercially available as an
adhesive tape is cut into a width of 6 words, wound around a voice coil povin 32, and then a
drive cone 33 is provided. The tape was inserted and the back of the tape and the drive cone 33
were joined with a conventional adhesive. The characteristics of this loudspeaker are shown by
the solid line in FIG. As clearly shown in FIG. 4, the high-pass sound peak is lower by 6 to 7 dB
than the conventional product (curved by a broken line), and the adhesive tape has a great effect
on flattening. Is understood. Of course, the type of pressure-sensitive adhesive tape is not limited
to the one used in the wood example, and a generally used rubber-based pressure-sensitive
adhesive may be used. And considering that there is no characteristic deterioration due to the
temperature rL of the adhesive tape at the time of large input pulling and that there is no
decrease in reliability due to aging, it is # # more heat resistant and aging resistant than using
rubber pressure sensitive adhesive It is more desirable to use an excellent silicone-based or
crosslinked acrylic-based adhesive as a base. Example 2 A commercially available adhesive tape
is treated with a release agent or the like at the back of the tape so that the adhesive does not
adhere to the back of the tape at the time of winding. In consideration of adhesion, it is desirable
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to sand-tape the tape back direction in advance, which makes it possible to improve the adhesion
and eliminate the peeling of the adhesive layer, thereby improving the reliability. Also, instead of
sandblasting, a base material with unevenness from the beginning is used, or the back surface is
not subjected to release treatment 5947, or by using a method such as reverse primer treatment
to improve adhesion. It is obvious that the same effect can be obtained. It is also effective to
improve the adhesion of the voice coil of the part to which the adhesive tape is attached by
roughening or primer treatment.
(Example 3) As shown in FIG. 5, an adhesive 62 was applied to one side of a substrate 51 and a
white melt adhesive 53 was applied to the back as an adhesive tape. In assembly, as shown in
FIG. 6L, the adhesive surface is wound and attached to the voice coil povin 61, and then the drive
cone 63 is inserted as shown in FIG. 6, and as shown in FIG. The drive cone and the voice coil
bobbin are bonded by heat-pressing the folded portion with a heat plate 64. At this time, it is
easier to insert the folded portion of the drive cone 63 in advance if it is slightly opened outward.
In the wood example, it is possible to ensure adhesion without any unfilled portion of the
adhesive or vice versa when the back of the tape and the drive cone are adhered with a normal
liquid adhesive. It is advantageous in terms of parameterization and reliability. A double-sided
pressure-sensitive adhesive tape may be used instead of a pressure-sensitive adhesive tape
having a hot-melt adhesive on one side, or a microcapsule type adhesive may be used instead of
the hot-melt adhesive. (Example 4) As shown in FIG. 7, as a pressure-sensitive adhesive tape, a
non-woven fabric 1 having a thickness of 311,111 was coated and impregnated with a pressuresensitive adhesive, and an adhesive layer 72 was provided on one side. While the thickness of the
adhesive layer on the commercially available adhesive tape is about 20 to 40 ?m, the thicker the
adhesive layer for wood purpose, the greater the effect. However, if the thickness of the pressuresensitive adhesive layer is increased, the coercivity decreases, and it may flow when the
temperature is high. In the wood example, the thickness of the adhesive layer was increased, and
it was possible to obtain a great effect on peak reduction without flowing due to filling between
fibers. Needless to say, the base material of the tape is not limited to the non-woven fabric, and
may be, for example, a porous material 1) such as a urethane foam sheet. 715969. (Example 6)
As an adhesive tape, a laminate of a substrate 81 and an adhesive layer 82 as shown in FIG. 8
was used. The base material used was kraft paper with a thickness of 30 ?m, and a cross-linked
acrylic pressure-sensitive adhesive was used for the pressure-sensitive adhesive layer. Since
vibration absorption is performed by abrasion of the adhesive layer, the number of layers of the
adhesive layer is large. A commercially available adhesive tape may be wound multiple times on
a voice coil to increase the number of adhesive layers. However, since the commercially available
adhesive tape is subjected to the back surface release treatment as described in the abovementioned 0, the reliability of the adhesive tape is poor unless the adhesion on the back surface
is considered. Since the wood example uses a laminate of multiple adhesive layers with a base
interposed therebetween, the problems of commercially available adhesive tapes are avoided, and
the thickness of the adhesive layer of each layer is thin, so it is usually used. Even when wound
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like a tape, no sticking of the adhesive occurred and handling became easy.
Also, the effect on the reduction of the sound pressure peak was greater than in the case where
the conventional adhesive tape was wound in a single layer. FIG. 9 shows the characteristics
when the number of adhesive layers is 114, 2 and 3 layers 0). In FIG. 1, one layer B is two layers
C and three layers "'1597-"; Sound pressure @ wave number characteristic at 10 o'clock is shown.
Of course, the number of adhesive layers, the thickness 4 of each layer, and the substrate may be
determined so as to obtain desired characteristics, and are not limited to those used in the
examples. If the effects of the present invention are listed again, the sound pressure peak due to
high-frequency resonance of the speaker is reduced by joining the drive cone and the voice coil
bobbin through the adhesive tape. And, by using the tape, the width, thickness and the like of the
adhesive layer can be determined even, and the variation can be reduced. 2. The peak reducing
effect was able to be enhanced by using a tape with a thick adhesive layer thickness prepared by
impregnating a fibrous or porous substrate with an adhesive. 3. The peak reducing effect can be
enhanced by using a tape in which the substrate and the adhesive layer are laminated in multiple
layers, and the handling can be facilitated. 4.) By applying roughening treatment or primer
treatment 59811 to the back of the tape, it was possible to improve the adhesion of the back and
to improve the reliability. 6. By applying a hot melt adhesive, a microcapsule type adhesive to the
back of the tape, or using a double-sided adhesive tape, the adhesion between the back of the
tape and the drive cone could be ensured. Although the drive cone drive type flat plate speaker
has been mainly described above as an example, the method of the present invention is not
limited to the above, and the voice coil is doubled also for the direct drive type flat plate speaker,
and the adhesive tape It can be applied by the method of connecting through, and can also be
applied by the same method to a general cone and speaker.
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