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JPS60210099

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DESCRIPTION JPS60210099
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker in which the outer periphery of a diaphragm is bonded to the inner periphery of a voice
coil bobbin. [Background of the Invention] FIGS. 1 and 2 show a conventional speaker in which
the outer periphery of a diaphragm and the inner periphery of a voice coil bobbin are bonded. In
FIG. 1, the diaphragm 1 is inserted into the inside of the voice coil bobbin 2 and adhered to the
inner peripheral surface of the voice coil bobbin 2 by an adhesive 4. However, in this
configuration, it is difficult to position the diaphragm 1 and the voice coil bobbin 2 in bonding.
Further, since the contact area between the outer peripheral surface of the diaphragm 1 and the
inner peripheral surface of the voice coil bobbin 2 is small, it is necessary to increase the amount
of adhesive 4 to compensate for this. There was a drawback that caused the pressure level to
drop. Further, there is one shown in FIG. 2 as a configuration for facilitating positioning of the
diaphragm and the voice coil bobbin. As shown in FIG. 2 + a), the upper end of the voice coil
bobbin 2 is provided with a plurality of (here, three) incisions, and each of the incised portions is
bent toward the inside of the voice coil bobbin 2 FIG. 2 fA) in which 10 is provided is an example
of a configuration using FIG. 2 + cL 1 and is a cross-sectional view taken along the line X- 0-(α).
According to this configuration, bonding between the diaphragm 1 and the voice coil bobbin 2
and bonding position positioning are facilitated, but when bonding the diaphragm 1 and the
voice coil bobbin 2, the adhesive 4 comes from the cut portion of the voice coil bobbin 2. There
was a risk of flowing out. In addition, since the strength of the voice coil bobbin 2 is cut, the voice
coil bobbin 2 is weakened to easily cause resonance. SUMMARY OF THE INVENTION It is an
object of the present invention to provide a speaker using a bonding structure of a diaphragm
and a voice coil bobbin for eliminating the drawbacks in the prior art as described above.
[Summary of the Invention] In order to achieve the above object, in the speaker according to the
present invention, the side surface of the voice coil bobbin is provided with a plurality of small
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diameter projections or projecting holes which project from the outside to the inside. The
diaphragm is placed on and adhered to the outer periphery (structurally above the hole) of the
protruding hole. As a result, the bonding position of the diaphragm and the voice coil bobbin can
be easily set, and the strength of the voice coil bobbin can be maintained, and the leakage of the
adhesive can be eliminated. Embodiments of the present invention will be described below with
reference to the drawings. FIG. 6 (α 1, (Al is a speed-force showing one embodiment of the
present invention). FIG. 1 shows the embodiment shown in FIG. 6 (α).
Compared to the conventional example shown in FIG. 2, the structure of the bonding portion
between the diaphragm 1 and the voice coil bobbin 2 is different. In the same drawing, the
imaging plate 1 is supported by a plurality of (here, three) projections 20 projecting toward the
inside from the outside provided on the side surface of the voice coil bobbin 2 (adhesion position
alignment is used in combination) It is fixed. The projections 20 have a small diameter so as not
to weaken the strength of the voice coil bobbin 2 and have projections for supporting the outer
periphery of the diaphragm 1. According to this configuration, since the diaphragm 1 is
supported by the projections 20, the application of the adhesive 4 is facilitated, and since the
voice coil bobbin 2 has no cut portion as in the prior art, the strength of the voice coil bobbin 2 is
maintained. Also, there is no flow of the adhesive 4 to the outside of the voice coil bobbin 2. FIG.
6 (b) shows an enlarged sectional view of an essential part of the bonding portion between the
diaphragm 1 and the voice coil bobbin 2. FIG. 4 (α), IA) is a speaker showing another
embodiment of the present invention. When the embodiment shown in FIG. 4 (α) is compared
with the conventional example shown in FIG. 1 and FIG. 2, the structure of the bonding portion
between the diaphragm 1 and the voice coil bobbin 2 is different. In the figure, the diaphragm 1
is supported by the projections 20 of a plurality of (here, six) holes 61 having projections 20
from the outside to the inside provided on the side surface of the voice coil bobbin 2 and fixed by
the adhesive 4 There is. The hole 61 provided on the inner side surface of the voice coil bobbin 2
has a small diameter so as not to weaken the strength of the voice coil bobbin 20, and the
protrusion 20 is considered so as to be able to support the outer periphery of the diaphragm 1.
In practical use, it can be easily realized by using a needle or the like. According to this
configuration, the same effects can be obtained as to the effects described in the previous
embodiment, and by providing the holes 31, the air flow between the outside and the inside of
the voice coil bobbin 2 is good, There is also an effect of suppressing the temperature rise in the
space inside the voice coil bobbin 2 caused by the heat generated by the current flow in the voice
coil 6. FIG. 4 fil shows an enlarged cross-sectional view of an essential part of a bonded portion
of the diaphragm 1 and the voice coil bobbin 2. 5 and 6 show modifications of the projected hole
shown in FIG. 4 and are included in the present invention. (IIL) is a figure which shows an
external appearance, (h) is a figure which shows the principal part cross section. Although the
embodiment of the present invention has been described using a loudspeaker having a domeshaped diaphragm, the present invention is applied to all loudspeakers formed by bonding the
diaphragm to the inner periphery of a voice coil bobbin.
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According to the present invention, in the speaker in which the diaphragm is adhered to the
inside of the voice coil bobbin, positioning and bonding of the diaphragm and the voice coil
bobbin can be facilitated and the strength of the voice coil bobbin can be maintained. There is an
effect that it is possible to obtain characteristics without deterioration of sound pressure
frequency characteristics of the speaker and deterioration of efficiency.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a vibration system including a frame of one conventional
speaker, FIG. 2 (al is a cross-sectional view of a vibration system including a frame of another
conventional speaker, and FIG. Fig.5 +-) is a sectional view of a vibration system including a
frame showing one embodiment of the present invention, Fig.6 IA) is an enlarged sectional view
of an essential part of Fig. 3 (α), Fig. 4 (eL) 4 is a sectional view of an imaging system including a
frame showing another embodiment of the present invention, FIG. 4 (Al is an enlarged sectional
view of a main part of FIG. 4 (α), FIG. 5 (α) is one of the present invention Fig. 5 tb) is an
enlarged cross-sectional view of the main part, Fig. 6 (a) is an external view of the main part of
another modification of the present invention, and Fig. 6 + A) is an enlarged cross-sectional view
of the main part FIG.
DESCRIPTION OF SYMBOLS 1 ... Diaphragm 2 ... Voice coil bobbin 3 ... Voice coil 4 ... Adhesive
agent 5 ... Edge 6 ... Frame 10 ... Claw 20 ... Protrusion 60 ... Protrusion place 51 ··· hole first
country second solid (b) 犀 3 figure (cL) seat 6 (0-) 5 mouth
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