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JP2002101493

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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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2002101493
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
so-called dynamic speaker, and more particularly to a support structure of a diaphragm by its
frame.
[0002]
2. Description of the Related Art A dynamic speaker has been known as one type of speaker. As
disclosed in, for example, Japanese Patent Laid-Open No. 6-178390, this dynamic speaker
generally includes a diaphragm on which a voice coil is fixed and a frame for supporting the
outer peripheral edge of the diaphragm. It has become.
[0003]
As a supporting structure of the diaphragm by the above-mentioned frame, as disclosed in the
above-mentioned publication, there is known one in which the outer peripheral flat portion of the
diaphragm is adhered and fixed to the annular flat portion of the frame. There is.
[0004]
However, it is difficult to secure sufficient adhesive strength simply by simply bonding and fixing
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1
the outer peripheral flat portion of the diaphragm to the annular flat portion of the frame as
described above. There is a risk that the adhesive surface may peel off during use of the speaker,
causing the diaphragm to come off the frame.
In particular, when this speaker is mounted on an automobile or the like, it is used in an
environment where a large vibration or an impact load acts, so that the detachment of the
diaphragm is more likely to occur.
[0005]
The present invention has been made in view of such circumstances, and it is an object of the
present invention to provide a dynamic speaker capable of effectively reducing the possibility of
the diaphragm coming out of the frame. It is said that.
[0006]
SUMMARY OF THE INVENTION The present invention aims at achieving the above object by
devising the configuration of the outer peripheral flat portion of the diaphragm.
[0007]
That is, a loudspeaker according to the present invention comprises a diaphragm on which a
voice coil is fixed, and a frame for supporting the outer peripheral edge of the diaphragm,
wherein the frame is supported by the frame. Is carried out by adhesively fixing an outer
peripheral flat portion formed on the diaphragm to an annular flat portion formed on the frame,
and at least one through hole or at least one through hole is formed in the outer peripheral flat
portion of the diaphragm. It is characterized in that a notch is formed.
[0008]
As far as the above "voice coil", "diaphragm" and "frame" can be used as components of a
dynamic speaker, the specific constitution such as the material and shape thereof is not
particularly limited. .
The method of “fixing” the voice coil to the diaphragm is not particularly limited. For example,
a method of fixing by bonding, caulking, or the like can be employed.
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[0009]
There is no particular limitation on the method of "adhering and fixing" the flat portion of the
outer peripheral edge of the diaphragm to the annular flat portion of the frame, and after
applying an adhesive to the frame or the diaphragm as in the prior art. In the state where the
outer peripheral flat portion of the diaphragm is in contact with the annular flat portion of the
frame, each through hole or notch is formed from the side opposite to the frame with respect to
the diaphragm. It may be performed by supplying an adhesive, or these two methods may be
used in combination.
[0010]
The above-mentioned "through holes" and "notches" are formed so that the adhesive can
penetrate from one side to the other side of the diaphragm through the through holes or the
notches. There are no particular limitations on the size, shape, and the like of the film, and the
number and arrangement of the film are not particularly limited.
[0011]
As described above, according to the speaker of the present invention, the support of the
diaphragm by the frame is achieved by bonding and fixing the outer peripheral flat portion of the
diaphragm to the annular flat portion of the frame. Although it is configured to be carried out, at
least one through hole or notch is formed in the outer peripheral flat portion of the diaphragm,
so it is possible to vibrate the adhesive through the respective through holes or notches. Can
wrap around on both sides of the
And since an adhesive agent can be functioned not only as an adhesion means but also as a
locking tool by this (that is, an anchor effect can be acquired), it just adheres and fixes a
diaphragm to a flame | frame like before. In comparison with the above, the fixing strength of the
diaphragm with respect to the frame can be increased.
[0012]
Therefore, according to the present invention, in the dynamic speaker, the risk of the diaphragm
coming off the frame can be effectively reduced.
[0013]
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Even if the through hole or notch is single, the anchor effect is exhibited in the through hole or
the notched portion, so that the fixing strength of the diaphragm to the frame as compared with
the conventional dynamic speaker is achieved. However, if a plurality of through holes or notches
are formed at predetermined intervals circumferentially along the outer peripheral flat portion,
the fixing strength of the diaphragm to the frame can be further enhanced.
[0014]
In the above construction, when the annular flat portion of the frame is formed with the annular
flange portion projecting along the outer peripheral shape of the diaphragm, the flow of the
adhesive by the flange portion is performed in bonding. Therefore, even in the case where a
notch is formed in the outer peripheral flat portion of the diaphragm, the adhesive can be easily
wound around on both sides of the diaphragm.
[0015]
As described above, the specific method of bonding and fixing is not particularly limited, but in a
state where the flat outer peripheral portion of the diaphragm is in contact with the annular flat
portion of the frame, the diaphragm The adhesive work can be performed extremely efficiently if
the adhesive fixing is performed by supplying the adhesive to each through hole or notch from
the side opposite to the frame.
[0016]
In this case, the adhesive is supplied to the through holes or the notches by relatively moving the
adhesive supply nozzle circumferentially along the annular flat portion of the frame. At that time,
the adhesive supply from the adhesive supply nozzle may be intermittently performed for each
through hole or notch, or may be continuously performed for a plurality of through holes or
notches. You may
[0017]
By the way, as a construction of the speaker, one in which a cover which partially covers the
diaphragm is adhesively fixed to the frame is known, however, the diaphragm is formed by the
cover and the annular flat portion of the frame. If the configuration is carried out by
sandwiching, it is possible to use an adhesive that wraps around both sides of the diaphragm
through each through hole or notch also for adhesive fixing of the cover, thereby simplifying the
bonding process and the speaker. The manufacturing cost can be reduced.
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In this case, the specific configuration such as the material and shape of the above "cover" is not
particularly limited.
[0018]
DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
First, a first embodiment of the present invention will be described.
[0019]
FIG. 1 is a side sectional view showing the speaker 10 according to the present embodiment in
the state of being disposed upward, and FIG. 2 is a perspective sectional view showing the main
part of the speaker 10. As shown in FIG.
3 is a detail view of a portion III in FIG. 1, and FIG. 4 is a detail view in the IV direction of FIG.
[0020]
As shown in FIG. 1, the loudspeaker 10 according to the present embodiment is a dynamic
loudspeaker comprising a diaphragm 12, a frame 14, a voice coil 16 and a magnetic circuit unit
18.
The speaker 10 is a small speaker having an outer diameter of about 30 mm, and as its
application, for example, the speaker 10 is mounted on a substrate in a state accommodated in a
case not shown and mounted on an automobile etc. It is supposed to be used.
[0021]
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5
The diaphragm 12 is a diaphragm-like circular member having a plurality of concavities and
convexities formed concentrically, and is formed by subjecting a synthetic resin film to heat press
molding.
The outer peripheral flat portion 12a of the diaphragm 12 and the middle flat portion 12b near
the center are formed as an annular flat surface located on the same horizontal plane.
[0022]
The frame 14 is a steel member and has a bottomed cylindrical portion 14A located at the center
and an annular mounting portion 14B extending radially outward from the vicinity of the upper
end of the outer peripheral surface of the bottomed cylindrical portion 14A. And consists of
A plurality of through holes (not shown) are formed in the mounting portion 14B at
predetermined intervals in the circumferential direction.
An annular flat portion 14Ba located above the upper end surface 14Aa of the bottomed
cylindrical portion 14A and a flange portion 14Bb extending upward from the annular flat
portion 14Ba are formed on the outer peripheral edge of the mounting portion 14B. ing.
[0023]
The diaphragm 12 is adhesively fixed to the annular flat portion 14Ba of the mounting portion
14B of the frame 14 at the outer peripheral flat portion 12a.
This bonding and fixing is performed in a state where the diaphragm 12 and the frame 14 are
arranged to be concentric with each other with respect to the central axis Ax of the speaker 10.
The flange portion 14Bb of the frame 14 is formed in an annular shape along the outer
peripheral shape of the diaphragm 12, and functions as a positioning guide when arranging the
diaphragm 12 concentrically with the frame 14 There is.
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[0024]
An upper end portion 16 a of the voice coil 16 is adhesively fixed to the middle flat portion 12 b
of the diaphragm 12 in a state where the voice coil 16 is disposed concentrically with the
diaphragm 12. The number of turns of the coil wire constituting the voice coil 16 is set to an
even number of turns so that both the winding start line and the winding end line extend from
the upper end portion 16 a of the voice coil 16.
[0025]
The magnetic circuit unit 18 is composed of a bottomed cylindrical portion 14A of the frame 14,
a magnet 20, and a yoke 22 made of steel. The magnet 20 and the yoke 22 are both formed in a
disk shape, and are placed on the bottom surface of the bottomed cylindrical portion 14 a so as
to be concentric with each other in this order and adhesively fixed to the frame 14. The magnetic
circuit unit 18 is set such that the upper end surface 22a of the yoke 22 and the upper end
surface 14Aa of the bottomed cylindrical portion 14A have substantially the same height, and the
outer peripheral surface of the yoke 22 and the bottomed cylindrical portion 14a A cylindrical
(cylindrical) magnetic gap G is formed with the same width throughout the entire circumference
between the inner circumferential surface of The lower end portion 16 b of the voice coil 16 is
accommodated in the cylindrical magnetic gap G.
[0026]
As shown in FIGS. 2 to 4, in the outer peripheral flat portion 12a of the diaphragm 12, a plurality
of circular through holes 12c are formed at predetermined angular intervals (for example, at
intervals of 7.5.degree.) In the circumferential direction. It is done.
[0027]
The adhesive fixing of the diaphragm 12 to the frame 14 is carried out by applying an adhesive
24 on the upper surface of the annular flat portion 14Ba of the frame 14 with a predetermined
width over the entire circumference, and then outside the diaphragm 12 on the annular flat
portion 14Ba. This is carried out by placing the peripheral flat portion 12a and pressing the
outer peripheral flat portion 12a toward the annular flat portion 14Ba using a jig not shown.
[0028]
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Due to the pressure contact, the adhesive 24 spreads between the annular flat portion 14Ba of
the frame 14 and the outer peripheral flat portion 12a of the diaphragm 12, and a part thereof is
the inner periphery of the outer peripheral flat portion 12a of the diaphragm 12. Protrudes to
the side and outer side.
Then, the adhesive 24 protruding to the outer peripheral side is blocked by the flange portion
14Bb of the frame 14 and flows upward along the gap between the inner peripheral surface of
the flange portion 14Bb and the outer peripheral end face 12d of the diaphragm 12. It swells up.
Further, due to the pressure contact, the adhesive 24 wraps around the upper surface side of the
outer peripheral flat portion 12a of the diaphragm 12 via the respective through holes 12c, and
is larger than the respective through holes 12c at a plurality of locations on the upper surface of
the outer peripheral flat portion 12a. It swells like a dome at its outer diameter.
[0029]
As described above in detail, in the speaker 10 according to the present embodiment, the support
of the diaphragm 12 by the frame 14 adheres and fixes the outer peripheral flat portion 12a of
the diaphragm 12 to the annular flat portion 14Ba of the frame 14 The plurality of through holes
12 c are formed in the outer peripheral flat portion 12 a of the diaphragm 12, so that the
adhesive 24 is used as a diaphragm through the respective through holes 12 c. It can be turned
around on both sides of the twelve. Thus, the adhesive 24 can be made to function not only as a
bonding means but also as a fastener (i.e., an anchor effect can be obtained), so the diaphragm is
simply bonded and fixed to the frame as in the prior art. In comparison to the above, the fixing
strength of the diaphragm 12 with respect to the frame 14 can be greatly enhanced. Therefore,
according to the present embodiment, in the dynamic speaker, the possibility that the diaphragm
is detached from the frame can be effectively reduced.
[0030]
Further, in the present embodiment, the annular flat portion 14Ba of the frame 14 is formed with
the annular flange portion 14Bb projecting along the outer peripheral shape of the diaphragm
12. The adhesive 24 protruding to the outer peripheral side of the outer peripheral flat portion
12a is blocked by the flange portion 14Bb, and bulges upward along the gap between the inner
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8
peripheral surface of the flange portion 14Bb and the outer peripheral end face 12d of the
diaphragm 12. The adhesive 24 also wraps around the outer peripheral end face 12 d of the
diaphragm 12. By this wraparound, the adhesive strength of the diaphragm 12 to the frame 14
can be further enhanced. Next, a second embodiment of the present invention will be described.
[0031]
FIG. 5 is a perspective sectional view showing the bonding and fixing of the diaphragm 12 and
the frame 14 in the speaker 10 according to this embodiment, and FIGS. 6 and 7 show the main
part in detail. 3 and 4 are similar views.
[0032]
As shown in these figures, the speaker 10 according to this embodiment also has the same basic
configuration as that of the first embodiment, but the method of bonding and fixing the
diaphragm 12 to the frame 14 is the first embodiment. It is different from
[0033]
That is, in the present embodiment, with the outer peripheral flat portion 12a of the diaphragm
12 mounted on the annular flat portion 14Ba of the frame 14, the adhesive 24 is supplied to the
respective through holes 12c from the upper side thereof. Thus, the two members are adhered
and fixed.
[0034]
The adhesive 24 is supplied in such a manner that the adhesive supply nozzle 102 is moved
relative to the frame 14 in the circumferential direction with the adhesive supply nozzle 102
facing the annular flat portion 14Ba of the frame 14. It is carried out by discharging the adhesive
24 from the adhesive supply nozzle 102 while letting the adhesive 24 flow.
Thus, the adhesive 24 is annularly supplied to the upper surface of the outer peripheral flat
portion 12 a of the diaphragm 12.
At this time, in each of the through holes 12c, the adhesive 24 wraps around the lower surface
side of the diaphragm 12 through the through holes 12c, and penetrates along the annular flat
portion 14Ba of the frame 14 by capillary action, as shown in FIG. In addition, it spreads in a
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substantially circular shape around each through hole 12c.
[0035]
As described above in detail, also in the present embodiment, the adhesive 24 wraps around on
both sides of the diaphragm 12 through the plurality of through holes 12 c formed in the outer
peripheral flat portion 12 a of the diaphragm 12. Since the adhesive 24 is used, the adhesive 24
can be made to function not only as a bonding means but also as a fastener, whereby the same
effect as that of the first embodiment can be obtained.
[0036]
Particularly, in the present embodiment, with the outer peripheral flat portion 12a of the
diaphragm 12 in contact with the annular flat portion 14Ba of the frame 14, each through hole is
formed from the opposite side of the diaphragm 14 with respect to the diaphragm 14. Since the
adhesive fixing is performed by supplying the adhesive 24 to 12c, the bonding operation can be
performed extremely efficiently.
[0037]
Incidentally, instead of continuously supplying the adhesive 24 from the adhesive supply nozzle
102 to the plurality of through holes 12c as in the present embodiment, spotting is intermittently
performed for each of the through holes 12c. It may be supplied.
Next, modifications of the first and second embodiments will be described.
[0038]
FIG. 8 (a) is a plan view of the main part showing the diaphragm 12 according to the first
modification, and FIG. 8 (b) is a plan view of the main part showing the diaphragm 12 according
to the second modification. It is.
[0039]
As shown in FIG. 8 (a), in the first modification, a plurality of through holes 12c are formed in the
outer peripheral flat portion 12a of the diaphragm 12 as in the first and second embodiments.
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10
However, while the size of each through hole 12c is smaller than that of the first and second
embodiments, many through holes 12c are formed.
FIG. 9 is a plan view of relevant parts showing the speaker 10 provided with the diaphragm 12 of
the first modified example.
[0040]
In the figure (a), the adhesive fixing of the diaphragm 12 to the frame 14 is carried out by
pressing the diaphragm 12 against the frame 14 to which the adhesive 24 has been previously
applied as in the first embodiment. It is the configuration when it is performed.
In this case, the adhesive 24 wraps around the upper surface side of the outer peripheral flat
portion 12a of the diaphragm 12 through the plurality of through holes 12c formed in the outer
peripheral flat portion 12a of the diaphragm 12, and the outer peripheral flat portion 12a. It
bulges in the shape of a dome with an outer diameter larger than each of the through holes 12c
at a plurality of locations on the upper surface of the.
[0041]
FIG. 6B is a configuration in which the adhesive fixing of the diaphragm 12 to the frame 14 is
performed by supplying the adhesive 24 from the adhesive supply nozzle 102 as in the second
embodiment. .
In this case, the adhesive 24 annularly supplied to the upper surface of the outer peripheral flat
portion 12a of the diaphragm 12 wraps around the lower surface side of the diaphragm 12
through the through holes 12c in each through hole 12c, and the capillary phenomenon occurs.
As a result, it penetrates along the annular flat portion 14Ba of the frame 14 and spreads in a
substantially circular shape around each through hole 12c.
[0042]
As described above, also in the present modification, the adhesive 24 can be made to function
not only as a bonding means but also as a fastener, thereby obtaining the same function and
12-05-2019
11
effect as the first and second embodiments. be able to.
[0043]
Particularly, in the present modification, since a large number of small through holes 12c are
formed, a uniform anchor effect is achieved over the entire bonding surface of the annular flat
portion 14Ba of the frame 14 and the outer peripheral flat portion 12a of the diaphragm 12. The
adhesive strength can be further enhanced by this.
[0044]
On the other hand, as shown in FIG. 8B, in the second modification, the outer peripheral flat
portion 12a of the diaphragm 12 is replaced with the plurality of through holes 12c in the first
and second embodiments. A plurality of notches 12e are formed.
Each of the notches 12e is formed in a U-shape, and is arranged radially at predetermined
angular intervals (for example, 7.5 ° intervals) in the circumferential direction.
FIG. 10 is a plan view of relevant parts showing the speaker 10 provided with the diaphragm 12
of the second modified example.
[0045]
In the figure (a), the adhesive fixation of the diaphragm 12 to the frame 14 is carried out by
pressing the diaphragm 12 against the frame 14 to which the adhesive 24 has been applied in
advance as in the first embodiment. It is the configuration when it is performed. In this case, the
adhesive 24 wraps around the upper surface side of the outer peripheral flat portion 12a of the
diaphragm 12 through the plurality of notches 12e formed in the outer peripheral flat portion
12a of the diaphragm 12, and the outer peripheral flat portion 12a. It bulges in a U-shape with
an outer diameter larger than each notch 12e in several places of the upper surface of.
[0046]
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12
FIG. 6B shows the structure in which adhesion and fixation of the diaphragm 12 to the frame 14
are carried out by supplying the adhesive 24 from the adhesive supply nozzle 102 as in the
second embodiment. . In this case, the adhesive 24 annularly supplied to the upper surface of the
outer peripheral flat portion 12a of the diaphragm 12 wraps around the lower surface side of the
diaphragm 12 through the notches 12e at each notch 12e, thereby causing capillary
phenomenon. As a result, it penetrates along the annular flat portion 14Ba of the frame 14 and
spreads in a substantially U shape around each of the through holes 12c.
[0047]
As described above, also in the present modification, the adhesive 24 can be made to function
not only as a bonding means but also as a fastener, thereby obtaining the same function and
effect as those of the first and second embodiments. be able to.
[0048]
Particularly in the present modification, as the configuration of the diaphragm 12, the notch 12e
is formed in the outer peripheral flat portion 12a, but in the annular flat portion 14Ba of the
frame 14, the diaphragm Since the flange portion 14Bb projecting along the outer peripheral
shape of 12 is formed, in the speaker configuration of FIG. 10 (a), the flow of the adhesive 24 can
be blocked by the flange portion 14Bb at the time of bonding. Thus, the adhesive 24 can be
easily rolled around on both sides of the diaphragm 12.
Next, a third embodiment of the present invention will be described.
[0049]
FIG. 11 is a perspective sectional view showing the main part of the speaker 10 according to this
embodiment, and FIG. 12 is a view similar to FIG. 3 showing the main part in detail.
[0050]
As shown in these figures, the speaker 10 according to this embodiment has a structure in which
a cover 26 partially covering the diaphragm 12 is adhered and fixed to the frame 14 in addition
to the structure of the first embodiment. It has become.
[0051]
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13
The cover 26 is a synthetic resin member which annularly covers the upper space of the
diaphragm 12, and its outer peripheral flat portion 26a is formed in a stepped manner.
The adhesion fixing of the cover 26 to the frame 14 places the outer peripheral flat portion 26a
of the cover 26 on the outer peripheral flat portion 12a (see FIG. 2) of the diaphragm 12 bonded
to the annular flat portion 14Ba of the frame 14. The outer peripheral flat portion 26a is pressed
against the annular flat portion 14Ba using a jig (not shown).
[0052]
The adhesive 24 raised in a dome shape from the upper surface of the outer peripheral flat
portion 12a in each through hole 12c of the diaphragm 12 by the pressure contact is the outer
peripheral flat portion 26a of the cover 26 and the outer peripheral edge of the diaphragm 12. It
spreads in a substantially circular shape around each through hole 12 c between the flat portion
12 a and the flat portion 12 a.
[0053]
As described above in detail, in the present embodiment, on the upper surface side of the
diaphragm 12 through the respective through holes 12c, the same function and effect as the first
embodiment can be obtained. Since the rolled-up adhesive 24 is used also for adhesive fixing of
the cover 26, the bonding process can be simplified and the manufacturing cost of the speaker
can be reduced.
[0054]
Incidentally, instead of adding the cover 26 to the configuration of the first embodiment as in the
present embodiment, it is also possible to add it to the configuration of the second embodiment.
That is, the outer peripheral flat portion 26a of the cover 26 is mounted on the outer peripheral
flat portion 12a (see FIG. 5) of the diaphragm 12 to which the adhesive 24 is supplied from the
adhesive supply nozzle 102. It is also possible to press-contact toward annular flat part 14Ba
using a jig which is not illustrated.
12-05-2019
14
[0055]
Also in this case, the adhesive 24 applied annularly on the upper surface of the outer peripheral
flat portion 12a of the diaphragm 12 by the pressure contact is the outer peripheral flat portion
26a of the cover 26 and the diaphragm 12. Since it spreads widely on the inner peripheral side
and the outer peripheral side with the outer peripheral flat portion 12a, the same function and
effect as the present embodiment can be obtained.
[0056]
In each of the above-described embodiments and modifications, the case where the speaker 10 is
a small-sized speaker has been described. However, even in the case where the speaker 10 is a
larger-sized speaker, the same configuration as that of each of the embodiments and
modifications It is possible to obtain the same effect as these by adopting.
[0057]
Brief description of the drawings
[0058]
1 is a side sectional view showing the speaker according to the first embodiment of the present
invention disposed upward
[0059]
2 is a perspective sectional view showing the main part of the speaker according to the first
embodiment.
[0060]
Fig. 3 Details of part III in Fig. 1
[0061]
4 IV direction arrow detail view of FIG. 1
[0062]
FIG. 5 is a perspective sectional view of an essential part showing how a diaphragm and a frame
are adhered and fixed in a speaker according to a second embodiment of the present invention.
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15
[0063]
6 is a view similar to FIG. 3 showing in detail the main part of the speaker according to the
second embodiment.
[0064]
7 is a view similar to FIG. 4 showing in detail the main part of the speaker according to the
second embodiment.
[0065]
FIG. 8A is a plan view of an essential part showing a diaphragm according to a first modification
of the first and second embodiments and FIG. 8B is a plan view of an essential part showing a
diaphragm according to a second modification.
[0066]
FIG. 9 is a plan view of an essential part showing a speaker provided with the diaphragm of the
first modified example.
[0067]
FIG. 10 is a plan view of an essential part showing a speaker provided with the diaphragm of the
second modification example.
[0068]
11 is a perspective sectional view showing the main part of the speaker according to the third
embodiment of the present invention
[0069]
12 is a view similar to FIG. 3 showing in detail the main part of the speaker according to the third
embodiment.
[0070]
Explanation of sign
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[0071]
DESCRIPTION OF REFERENCE NUMERALS 10 speaker (dynamic speaker) 12 diaphragm 12a
outer peripheral flat portion 12a 12b middle flat portion 12a 12c through hole 12d outer
peripheral end face 12e notch 14 frame 14A bottomed cylindrical portion 14Aa upper end
surface 14B mounting portion 14Ba annular flat portion 12a14Bb flange portion 16 voice coil
16a upper end 16b lower end 18 magnetic circuit unit 20 magnet 22 yoke 24 adhesive 26 cover
26a outer peripheral flat portion 102 adhesive supply nozzle Ax central axis G cylindrical
magnetic gap
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