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JPH10341499

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Notice
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 JPH10341499
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker, and more particularly to a speaker in which a reinforcing ring is attached to the front of
a voice coil bobbin.
[0002]
2. Description of the Related Art FIG. 3 is a side cross-sectional view schematically showing a
conventional general speaker, in which 21 indicates a pole piece. The pole piece 21 is formed in
a cylindrical shape, and a magnet 22 is disposed on the outer periphery of the pole piece 21
concentrically with the pole piece 21. A substantially ring-shaped top plate 23 is disposed on the
front surface of the magnet 22, and the magnet 22 is held by the top plate 23 and a yoke plate
21a integrally formed with the rear pole piece 21 of the pole piece 21. There is. A frame 24 in
the form of a side surface of a substantially hollow inverted truncated cone having a large
opening 24c is disposed on the front surface of the top plate 23, and flange portions 24a and
24b having a substantially ring shape are formed on the front and rear ends of the frame 24. The
flange 24 b is attached to the front of the top plate 23. A voice coil 25 is disposed between the
pole piece 21 and the magnet 22, the top plate 23, and the lower part of the frame 24. The voice
coil 25 has a thickness t of about 0.075 to 0.10 mm. A bobbin 25a formed in a substantially
cylindrical shape using an aluminum foil, a resin film or the like, and a wire 25b made of a
copper wire wound around the outer periphery of the bobbin 25a. The voice coil 25 is supported
by the damper 26 so as to be able to vibrate in the front-rear direction, and the damper 26 is
formed with a plurality of corrugations 26 a concentrically. The damper outer peripheral portion
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26b is attached to the front surface of the flange portion 24b using an adhesive. One end of the
diaphragm 28 is attached to the front of the bobbin 25a, and the other end of the diaphragm 28
is attached to the flange 24a via the edge 27 so that the vibration of the voice coil 25 propagates
to the diaphragm 28. It has become. Further, a substantially hemispherical cap 29 a is crowned
on the base of the diaphragm 28. One end of a lead wire 29b is connected to the wire 25b, and
the lead wire 29b is connected to a terminal 29c mounted on the opening 24c of the frame 24
after passing through the side of the bobbin 25a. The speaker 20 is configured to include the
pole piece 21, the magnet 22, the voice coil 25, the diaphragm 28 and the like.
[0003]
In the speaker 20 configured as described above, since the vicinity of the wire 25b is excited in a
predetermined direction by the magnet 22, the drive current i from the main amplifier (not
shown) flows through the terminal 29c and the lead wire 29b. The voice coil 25 is driven to
vibrate at the same frequency as the change of the drive current i. Then, this vibration is
propagated to the diaphragm 28 via the bobbin 25 a, and the air on the front surface of the
diaphragm 28 is vibrated and the sound is transmitted to the front of the speaker 20.
[0004]
However, in the conventional speaker 20, when the driving power is large and the vibration of
the voice coil 25 is large, the circular shape in the horizontal cross section view of the bobbin
25a and the diaphragm 28 is easily deformed, which adversely affects acoustic characteristics
such as distortion characteristics. There was a problem that it was easy to occur. In order to cope
with this problem, a speaker having a reinforcing ring attached to the front of the bobbin 25a has
been proposed.
[0005]
FIG. 4 is an enlarged schematic side cross-sectional view showing the vicinity of the voice coil of
the conventional loudspeaker of this type, in which 25 is a voice coil, 25a is a bobbin constituting
the voice coil 25, 25b is a wire, and 28 is a The diaphragms are shown respectively. A ring main
body 31a formed in a substantially cylindrical shape using a high-strength material such as
aluminum or synthetic resin is closely disposed on the inner peripheral surface of the front part
of the bobbin 25a, and the front and rear end portions of the ring main body 31a The flanges
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31b and 31c substantially in the shape of a ring are extended, and the reinforcing ring 31 is
configured to include the ring main body 31a and the flanges 31b and 31c. The other
configuration is the same as that of the speaker 20 shown in FIG. 3, and thus the detailed
description thereof is omitted here. The speaker 30 is configured to include the voice coil 25, the
diaphragm 28, the reinforcing ring 31, and the like.
[0006]
In the case of the speaker 30 configured as above, after applying an adhesive to a predetermined
location on the outer periphery of the reinforcing ring 31, the reinforcing ring 31 is inserted
from the front side of the bobbin 25a until the flange portion 31b abuts on the front surface of
the bobbin 25a. When the contact surfaces are in close contact with each other, the reinforcing
ring 31 is attached and fixed to the front of the bobbin 25a. An adhesive is applied to the inner
surface of the cylindrical body 28b of the diaphragm 28 and inserted, and the cylindrical body
28b is formed on the bobbin 25a while adjusting the distance between the rear end of the
diaphragm body 28a and the front end of the bobbin 25a to be d. When closely attached, the
diaphragm 28 is attached to the bobbin 25a.
[0007]
FIG. 5 is an enlarged schematic side sectional view showing the vicinity of the voice coil of
another conventional speaker disclosed in Japanese Utility Model Application Laid-Open No. 634397, wherein 25 is a voice coil and 25 a is a voice coil 25. 25b represents a wire, and 28
represents a diaphragm. A ring main body 41a formed in a substantially cylindrical shape using a
high strength material such as aluminum or a synthetic resin is closely disposed on the inner
peripheral surface of the front portion of the bobbin 25a, and is disposed at the front and rear
end portions of the ring main body 41a. The flange portions 41b and 41c having a substantially
ring shape are extended respectively. An outer wall 41d extends rearward from the outer edge of
the flange 41b, and the inner surface of the outer wall 41d closely contacts the outer peripheral
surface of the bobbin 25a, and the rear surface of the flange 41b and the rear end 41e of the
outer wall 41d The distance is set to d. Further, on the outer periphery of the outer wall portion
41d, there is formed an inclined portion 41f having a shape along the front surface of the
diaphragm 28, starting from the rear end portion 41e. The reinforcing ring 41 is configured to
include the ring main body 41a, the flange portions 41b and 41c, the outer wall portion 41d, and
the inclined portion 41f. The other configuration is the same as that of the speaker 20 shown in
FIG. 3, and thus the detailed description thereof is omitted here. The speaker 40 is configured to
include the voice coil 25, the diaphragm 28, the reinforcing ring 41, and the like.
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[0008]
In the case of the speaker 40 configured as described above, after applying an adhesive to a
predetermined location on the outer periphery of the reinforcing ring 41, the reinforcing ring 41
is inserted from the front side of the bobbin 25a until the flange portion 41b abuts on the front
surface of the bobbin 25a. When the contact surfaces are in close contact with each other, the
reinforcing ring 41 can be attached and fixed to the front of the bobbin 25a. Further, an adhesive
is applied to a predetermined portion of the front surface of the diaphragm main body 28a of the
diaphragm 28 and the inner surface of the cylindrical body 28b and inserted before the
reinforcing ring 41 is inserted into the bobbin 25a. When the diaphragm main body 28a and the
cylindrical body 28b are brought into close contact with the inclined portion 41f and the bobbin
25a while adjusting so that the lower end portion of the diaphragm main body 28a matches, the
diaphragm 28 is attached to the bobbin 25a.
[0009]
In the above-described speaker 20, as described above, when the drive power is increased and
the drive amplitude of the voice coil 25 is increased, the root portions of the bobbin 25a and the
diaphragm 28 are provided. A large force acts, and the circular shape of the bobbin 25a and the
diaphragm 28 in a horizontal cross-sectional view is distorted, and the acoustic characteristics
are likely to be adversely affected.
[0010]
Further, in the speaker 30, the reinforcing ring 31 suppresses the deformation of the front
portion of the bobbin 25a.
However, since the diaphragm 28 itself is not reinforced, if the vibration stress is concentrated in
the vicinity of the rear end of the diaphragm 28, it is deformed and the acoustic characteristics
are likely to be adversely affected, or the diaphragm 28 is peeled off from the bobbin 25a to
deteriorate the performance. Easy to do.
[0011]
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Further, in the speaker 40, even if stress concentration occurs at the rear end portion of the
diaphragm main body 28a, the deformation is suppressed because the reinforcement is
performed by the inclined portion 41f. However, it is troublesome to accurately align the rear
end of the diaphragm body 28a with the rear end 41e of the reinforcing ring 41, and if the
alignment is not good, the diaphragm main body 28a is reinforced by the inclined portion 41f. It
will be inadequate.
[0012]
Further, in any of the above-described speakers 20, 30, 40, the lead wire 29b is in contact with
the voice coil 25 and the diaphragm 28 at substantially the same radius portion at one place, is
easily biased in weight, and distortion occurs in sound. There is a problem that there is a risk of
[0013]
The present invention has been made in view of the above problems, and the diaphragm can be
accurately and easily positioned and attached to the voice coil, and deformation, peeling, and
breakage of the diaphragm and the voice coil can be reliably prevented, and the lead It is an
object of the present invention to provide a speaker capable of improving acoustic characteristics
by balancing with a line.
[0014]
SUMMARY OF THE INVENTION In order to achieve the above object, a speaker according to the
present invention comprises a diaphragm, a voice coil, and a reinforcing ring attached to the
front of the voice coil bobbin. In the speaker, an inclined portion having a shape along the front
surface of the diaphragm is formed on the outer periphery of the reinforcing ring, and a
projection is formed at at least one position of the inclined portion, while a hole into which the
projection is inserted is It is characterized in that it is formed on the diaphragm.
[0015]
According to the speaker described above, the voice coil and the diaphragm are reliably
reinforced by the reinforcing ring, and deformation, peeling, and breakage of the voice coil and
the diaphragm can be prevented, and moreover, the lead wire is inserted. The voice coil and the
diaphragm are fixed to the lead wire by forming at least one protrusion set to a predetermined
length on the inclined portion on the side opposite to the location where the voice coil is placed.
It can always be supported in good balance.
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Further, by inserting the projection into the hole, the diaphragm can be accurately and easily
positioned with respect to the voice coil when the diaphragm is attached.
As a result of these, it is possible to improve the acoustic characteristics of the speaker and to
prevent deterioration thereof.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a loudspeaker according to
the present invention will be described below with reference to the drawings.
The same reference numerals are given to components having the same functions as those of the
conventional example. FIG. 1 is a side sectional view schematically showing the speaker
according to the embodiment. Moreover, FIG. 2 is a model drawing which expanded and showed
the voice coil vicinity of the speaker based on embodiment, (a) is side surface sectional drawing,
(b) is the AA sectional drawing in (a). . In the figure, 25 indicates a voice coil, 25a indicates a
bobbin constituting the voice coil 25, 25b indicates a wire, 12 indicates a diaphragm, and the
diaphragm 12 has a diaphragm main body 12a having a substantially hollow inverted truncated
cone side shape. A cylindrical body 12b extends from the rear end of the diaphragm main body
12a, and a hole 12c is formed in the rear end of the diaphragm main body 12a. The front end of
the diaphragm body 12a is attached to the inner edge of the edge 27 using an adhesive. On the
other hand, at the front of the bobbin 25a, a reinforcing ring 11 formed of a high strength
material such as aluminum or synthetic resin is disposed. A substantially cylindrical ring body
11a is closely disposed on the inner peripheral surface of the bobbin 25a, and substantially ringshaped flange portions 11b and 11c are extended at the front and rear end portions of the ring
body 11a, An outer wall portion 11d is extended in the rear direction at an outer edge portion of
the flange portion 11b. The inner surface of the outer wall portion 11d is in close contact with
the outer peripheral surface of the bobbin 25a, and the distance between the rear surface of the
flange portion 11b and the rear end portion 11e of the outer wall portion 11d is set to d. Further,
an inclined portion 11f starting from the rear end 11e and inclined along the front surface of the
diaphragm 12 is formed on the outer periphery of the outer wall portion 11d, and a
predetermined portion on the side opposite to the lead-out direction of the lead wire 29b is
formed. One projecting portion 11g having a length is cut out from the inclined portion 11f, and
extends in a direction perpendicular to the axial center of the bobbin 25a. The reinforcing ring
11 is configured to include the ring body 11a, the flanges 11b and 11c, the outer wall 11d, the
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inclined portion 11f, and the protrusion 11g. The other configuration is the same as that of the
conventional speaker 20 shown in FIG. 3, so the detailed description thereof is omitted here. The
speaker 10 is configured to include the reinforcing ring 11, the diaphragm 12, the voice coil 25
and the like.
[0017]
In the case of the speaker 10 configured in this manner, an adhesive is applied to predetermined
places on the front surface of the diaphragm main body 12a and the inner surface of the
cylindrical body 12b, and the diaphragm 12 is fitted on the outer periphery of the bobbin 25a. Is
applied from the front side of the bobbin 25a until the reinforcing ring 11 is in contact with the
front surface of the voice coil 25 until the flange 11b of the reinforcing ring 11 abuts on the
front surface of the voice coil 25. Fixed to the At the same time, the projection 11g is inserted
into the hole 12c, and the diaphragm main body 12a and the cylindrical body 12b are brought
into close contact with the inclined portion 11f and the bobbin 25a, respectively. Then, the
diaphragm 12 is fixed to a predetermined position of the voice coil 25 through the reinforcing
ring 11, and the lead wire is formed by the protrusion 11g if the lead-out direction of the lead
wire 29b is opposed to the arrangement portion of the protrusion 11g. It can be balanced in
weight with 29b.
[0018]
As is clear from the above description, in the speaker 10 according to the embodiment, the lead
wire 29b is present by positioning one protrusion 11g set to a predetermined length at a location
facing the lead wire 29b. However, the voice coil 25 and the diaphragm 12 can always be
supported in a well-balanced manner. Further, since the projection 11g is formed on the outer
wall rear end 11e of the reinforcement ring 11, the diaphragm 12 can be accurately and easily
inserted into the voice coil 25 and the reinforcement ring 11 by inserting the projection 11g into
the hole 12c. It can be positioned relative to it. Further, since the reinforcing ring 11 and the
diaphragm 12 are not separated, the voice coil bobbin 25a and the diaphragm 12 can be reliably
reinforced by the reinforcing ring 11, and deformation and peeling of the voice coil 25 and the
diaphragm 12 can be achieved. Destruction can be prevented. As a result of these, it is possible to
improve the acoustic characteristics of the speaker 10 and to prevent deterioration thereof.
[0019]
In the embodiment described above, the case where the number of the protrusion 11g and the
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hole 12c is one has been described. However, the present invention is not limited to this. For
example, as indicated by the dashed dotted line in FIG. , 11i and holes 12d, 12e.
[0020]
Brief description of the drawings
[0021]
1 is a side cross-sectional view schematically showing an embodiment of a speaker according to
the present invention.
[0022]
2 is an enlarged schematic view showing the vicinity of the voice coil of the speaker according to
the embodiment, (a) is a side cross-sectional view, (b) is a cross-sectional view taken along line
AA in (a).
[0023]
3 is a side sectional view schematically showing a conventional general speaker.
[0024]
4 is a schematic side cross-sectional view showing the vicinity of the voice coil of the speaker to
which the conventional reinforcing ring is attached.
[0025]
5 is a schematic side cross-sectional view showing the vicinity of the voice coil of the speaker to
which another conventional reinforcement ring is attached.
[0026]
Explanation of sign
[0027]
DESCRIPTION OF SYMBOLS 10 Speaker 11 Reinforcement ring 11f Inclination part 11g
Protrusion part 12 Diaphragm 12c Hole 25 Voice coil 25a Bobbin
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