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JPH09322291

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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 JPH09322291
[0001]
The present invention relates to a speaker in which a movable portion for vibrating a diaphragm
is elastically supported by a plurality of dampers. In particular, the distance between the dampers
can be shortened to reduce the thickness of the speaker, and The present invention relates to a
speaker that facilitates the assembly of the speaker.
[0002]
2. Description of the Related Art FIG. 3 is a longitudinal sectional view of a conventional dynamic
type speaker used for vehicles and the like. The frame of this speaker is composed of three parts
of horn frame 1, pedestal 2 and bottom cover 3. Horn frame 1 is fixed to the upper part of
pedestal 2 and bottom cover 3 is fixed to the lower part by screwing etc. . The diaphragm 4 is
formed of a paper material or the like in a so-called parabolic cone shape, and the outer
peripheral portion of the diaphragm 4 is joined to the opening edge 1 a which is the maximum
outer diameter of the horn frame 1 through the deformation joint 6 . The deformation joint 6 is
separate from the diaphragm 4, has a substantially arc-shaped cross section, and is
circumferentially formed along the opening edge 1 a of the horn frame 1.
[0003]
In addition, a cylindrical bobbin 9 is bonded to the back surface of the bottom 4 a of the
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diaphragm 4 by an adhesive or the like and extends in the direction of the bottom cover 3. On
the outer peripheral surface of the bobbin 9, cylindrically wound coils C1 and C2 are provided. A
damper 5a having a waveform deformation portion formed in multiples concentrically around
the center O-O axis is joined to the outer peripheral portion 9a at one end of the bobbin 9 on the
diaphragm 4 side, and the edge of the outer periphery of the damper 5a Is joined to the step 1 d
on the inner surface of the horn frame 1. A damper 5b having the same shape as that of the
damper 5a is joined to an outer peripheral portion 9b at one end of the bottom lid 3 side of the
bobbin 9, and an outer peripheral edge of the damper 5b is joined to the step 2b of the pedestal
2. . That is, the bobbin 9 is elastically supported via the dampers 5a and 5b having a two-stage
structure, and can be vibrated in the Y direction by the deformation of the dampers 5a and 5b.
[0004]
A through hole 2a having a circular cross section is formed at the center of the base 2, and a
cylindrical center pole 3a protruding into the through hole 2a is provided at the center of the
bottom lid 3, and the bobbin 9 is The through hole 2a and the center pole 3a are inserted in the
gap. A support yoke 7 made of a cylindrical high permeability material is fixed to the outer
peripheral surface of the center pole 3a, and two cylindrical magnets Ma and Mb are fixed to the
outer surface thereof. Further, on the inner surface of the pedestal 2, an opposing yoke 8 formed
of a cylindrical high magnetic permeability magnetic material is fixed.
[0005]
In this speaker, a magnetic drive unit M0 is configured by the support yoke 7, the magnets Ma
and Mb, and the facing yoke 8. The bobbin 9 is inserted in the gap between the magnets Ma and
Mb and the opposing yoke 8, and the coils C1 and C2 are located in the gaps G1 and G2 between
the magnets Ma and Mb and the opposing yoke 8. This speaker is suitable for the diaphragm 4
and the bobbin 9 having a large amplitude, such as for bass or high output. Since the bobbin 9 is
supported by the dampers 5a and 5b in two stages by the dampers 4a and 5b, the coils C1 and
C2 are stable even in the narrow gaps G1 and G2 even if the bobbin 4 with the diaphragm 4
vibrates in the Y axis direction with large amplitude. And can move. In this two-stage damper
system, the straightness of the vibration of the bobbin 9 and the diaphragm 4 is excellent, and
distortion of sound is less likely to occur.
[0006]
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However, in the structure shown in FIG. 3, the support yoke 7 and the magnets Ma and Mb are
fixed to the center side, the opposing yoke 8 is fixed to the outside, and the bobbin 9 and the
coils C1, C1 are interposed therebetween. Since C2 is inserted, the two-stage dampers 5a and 5b
need to be disposed at positions separated in the vertical direction in the drawing with the
pedestal 2 as the fixing portion interposed therebetween. Further, in the low sound use and high
output use, since the amplitude of the diaphragm 4 and the bobbin 9 in the Y-axis direction is
large, the moving distance of the dampers 5a and 5b moving following the bobbin 9 becomes
long, and this moving distance is secured. For this purpose, it is necessary to separate the
damper 5a from the upper end of the pedestal 2 in the figure and to separate the damper 5b
from the lower end of the pedestal 2 in the figure. For this reason, the dimension in the Y-axis
direction of the portion behind the diaphragm 4 of the speaker (downward in the drawing)
becomes larger, and for example, in the case of in-vehicle use, a large space is required to install
the speaker in the vehicle.
[0007]
Further, in the speaker shown in FIG. 3, since the two-stage dampers 5 a and 5 b are disposed on
both sides in the vertical direction in the drawing across the pedestal 2, the assembly work of
each component can be performed both on the front and rear The process is complicated. That is,
first, with the bobbin 9 to which the coils C1 and C2 are fixedly inserted, the through hole 2a of
the base 2 is inserted between the outer periphery 9b of the lower end of the bobbin 9 and the
step 2b of the base 2 from the direction of the bottom cover 3. Attach the damper 5b between
them. Next, the horn frame 1 is screwed to the pedestal 2, and the damper 5 a is attached
between the outer peripheral portion 9 a of the bobbin 9 and the step 1 d of the cone frame 1
from the direction of the diaphragm 4. After the attachment of the dampers 5a and 5b, the
bottom 4a of the diaphragm 4 is adhered to the tip of the bobbin 9, and the outer peripheral
portion of the diaphragm 4 is adhered to the step 1d through the deformation joint 6. Finally, the
bottom cover 3 to which the center pole 3a is fixed is attached to the base end of the pedestal 2.
As described above, since the dampers 5a and 5b are located on both sides of the pedestal 2, it is
necessary to perform the assembling operation from the front and the rear with respect to the
pedestal 2, and the assembling operation is very complicated.
[0008]
The present invention solves the above-mentioned conventional problems, and even when the
amplitude of the diaphragm and the movable part is large, the damper can stably support the
movable part by the damper, and the entire structure can be thinned, and further assembly work
is also possible. The purpose is to provide a speaker that is easy.
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[0009]
A speaker according to the present invention comprises a diaphragm attached to a frame, a
movable portion operating integrally with the diaphragm, and a magnetic drive portion for
vibrating the movable portion. In the magnetic drive unit, a coil is provided on the fixed unit side,
a magnet facing the movable unit side with the coil interposed therebetween, and a facing yoke
are provided, and the fixed unit is capable of vibrating the movable plate. It is characterized in
that a multi-stage damper is provided to support from the side.
[0010]
Further, the speaker according to the present invention includes a diaphragm provided at the
opening of the frame, a movable part operating integrally with the diaphragm, and a magnetic
drive part for vibrating the movable part, the magnetic drive In the part, an opposing yoke and a
coil provided on the outer surface thereof are provided on the fixed part side, a magnet facing
the outside of the coil is provided on the movable part side, and the diaphragm can vibrate the
movable part. Is characterized in that a plurality of stages of dampers are provided to support
from the fixed part side.
[0011]
In each of the above speakers, two coils spaced in the vibration direction of the diaphragm are
provided on the fixed part side, and a magnet facing each of the two coils is provided on the
movable part side. Is possible.
[0012]
The speaker of the present invention is a so-called moving magnet type speaker in which a
magnet as a magnetism generating member is provided on the movable portion side.
[0013]
In the first invention, for example, a bobbin having a double-sectioned structure is used as the
movable portion.
The bobbin has a proximal end as an open end and a gap is formed between the inner wall and
the outer wall.
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Then, one of the inner wall and the outer wall in the gap is fixed to a thin cylindrical opposing
yoke having high magnetic permeability, and the other side is fixed to a cylindrical magnet.
In addition, a gap is formed in the gap between the magnet and the facing yoke, and a coil
supported on the fixed portion side is inserted in the gap.
[0014]
In the second invention, a cylindrical opposing yoke is fixed to the outer periphery of the center
pole on the fixed portion side, and the coil is fixed to the outer surface thereof.
Moreover, a magnet is attached to the inner peripheral side of the bobbin used as the movable
part side, and this magnet opposes the said coil.
[0015]
In the present invention, since the magnet is provided on the movable portion such as the
bobbin, it is not necessary to insert the movable portion into the gap on the fixed portion side as
shown in FIG. The space can be formed on the outer periphery of the movable portion such as a
bobbin of the movable portion.
Therefore, it is possible to dispose multiple dampers supporting the movable part in the space of
the outer peripheral part of the movable part, and to provide the multiple dampers at short
intervals, so that the speaker can be thinned. Further, at the time of assembly, since the multiple
stages of dampers can be attached to the outside of the movable part as a continuous operation,
the assembly operation is simple.
[0016]
In the second aspect of the invention, it is not necessary to provide the opposing yoke on the
movable portion, and the weight of the movable portion can be reduced.
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[0017]
According to the present invention, since the movable part is supported by multiple stages of
dampers, even if the amplitude of the diaphragm and the movable part (bobbin) is large,
straightness of this movable part can be secured to prevent distortion of sound. Suitable for bass
and high output.
Therefore, in the present invention, even in the case where one coil and one magnet are
provided, it is effective in terms of thinning and easiness of assembly.
[0018]
However, the present invention is particularly effective in the case where two coils and two
magnets are provided. When two magnets are provided, when the magnetizing magnetic poles of
the coil facing surface of one magnet and the coil facing surface of the other magnet are
different, a magnetic path extending between the two magnets is formed, and this magnetic path
Besides, the magnetic flux is less likely to leak, and the magnetic flux can be effectively applied to
the two coils. In addition, when the directions of the magnetic flux with respect to the coil facing
surfaces of the two magnets are made different and the directions of the current to the coils
facing the respective magnets are reversed, the drive sensitivity in the magnetic drive unit
becomes excellent.
[0019]
As described above, in the case where the two magnets and the coil are provided, the axial length
dimension of the magnetic drive unit constituted by the coil and the magnet becomes large, and
therefore, in order to stabilize the support of the movable portion, It is desirable to provide
multiple stages of dampers. Even in such a case, a plurality of dampers can be disposed in the
space on the outer periphery of the bobbin which is the movable portion, and the whole can be
thinned.
[0020]
In addition, since the coil is provided on the fixing portion side, it is easy to set the wiring of the
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conduction path to the coil.
[0021]
DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with
reference to the drawings.
FIG. 1 shows a first configuration example of a speaker according to the present invention, in
which (A) is a sectional view and (B) is a partially enlarged view showing a magnetic drive unit in
(A). The frame constituting the speaker A1 is composed of a horn frame 11 provided on the
sound generation side and a base end frame 12 provided on the base end side. A deformed joint
16 having a substantially arc-shaped cross section along the circumference is joined to the
opening edge 11a of the horn frame 11, and the outer peripheral edge of the diaphragm 14 is
fixed to the inner periphery of the deformed joint 16. It is done. The diaphragm 14 is made of
paper, a laminate of paper and resin, or resin such as PP resin, and is formed in a so-called
parabolic cone shape.
[0022]
A cylindrical bobbin 19 extending in the direction of the base end frame 12 is bonded to the back
surface of the bottom portion 14 a of the diaphragm 14 with an adhesive or the like. The bobbin
19 has a double cylindrical structure, the cross section of which has an inner wall 19a and an
outer wall 19b, and a gap 19c formed between the inner wall 19a and the outer wall 19b is open
on the proximal side. The bobbin 19 is formed to be lightweight by a nonmagnetic material such
as paper or resin. Inside the gap 19c, an inner peripheral yoke (supporting yoke) 17a and an
outer peripheral yoke (opposing yoke) 17b respectively formed in a thin cylindrical shape with
magnetic materials of high magnetic permeability are fixed to the inner surfaces of the inner wall
19a and the outer wall 19b. ing. Cylindrical magnets 18a and 18b are fixed to upper and lower
portions of the outer peripheral surface of the inner peripheral yoke 17a, respectively. The
magnets 18a and 18b are fixed to a bobbin 19 serving as a movable portion, and the magnet
itself becomes a part of the movable portion, so a lightweight magnetic member such as a plastic
magnet or a high magnetic field with a small volume such as a rare earth magnet. Preferably it
can be generated.
[0023]
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From the bottom surface of the base end frame 12, a cylindrical fixed portion (center pole) 12 a
is erected integrally in the direction of the diaphragm 14. The base end frame 12 and the fixing
portion 12a are formed of a nonmagnetic material such as a nonmagnetic metal or a synthetic
resin material. The coil C1 is attached to the tip portion of the fixed portion 12a, and the coil C2
is attached at a predetermined interval. In FIG. 1B, the coils C1 and C2 are embedded in the fixing
portion 12a, but the coils C1 and C2 are wound around the outer peripheral surface or the inner
peripheral surface of the fixing portion 12a. May be
[0024]
As shown in FIG. 1A, the fixing portion 12a having the coils C1 and C2 is inserted into the gap
between the magnets 18a and 18b in the bobbin 19 and the outer peripheral yoke 17b, and in
this state, the horn frame 11 and the base end frame 12, and the frames 11 and 12 are fixed to
each other by screws 20. In this bonded state, as shown in FIG. 1B, the magnet 18a and the coil
C1, and the magnet 18b and the coil C2 face each other. A slight gap G1 is formed between the
magnet 18a and the coil C1, and between the coil C1 and the outer peripheral yoke 17b, and
similarly between the magnet 18b and the coil C2, and between the coil C2 and the outer
peripheral yoke 17b. A slight gap G2 is formed therebetween.
[0025]
The magnetic drive unit M1 is configured by the inner peripheral yoke 17a, the outer peripheral
yoke 17b, the magnets 18a and 18b, the coils C1 and C2, and the gaps G1 and G2. In this
example, the side facing the coil C1 of the magnet 18a is the magnetized surface of the N pole,
the side facing the coil C2 of the magnet 18b is the magnetized surface of the S pole, or the
above N pole and S pole are opposite. In both magnets 18a and 18b, the magnetized poles on the
same side facing the coil are different from each other. Therefore, a closed magnetic circuit is
formed which circulates from the magnet 18a to the outer peripheral yoke 17b, the magnet 18b,
and the inner peripheral yoke 17a (or circulates in the opposite direction). By thus making the
magnetization directions of the magnets 18a and 18b different and forming a circulating closed
magnetic path, leakage flux or invalid magnetic flux from this closed magnetic path is minimized,
and an efficient magnetic drive portion M1 is formed. Ru.
[0026]
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Further, the coils C1 and C2 are formed in opposite winding directions, and when a
predetermined voice current is applied to the coils C1 and C2, currents which circulate in
opposite directions are applied to both coils C1 and C2. Therefore, the magnetic driving force
applied to the magnet 18a and the magnetic driving force applied to the magnet 18b are in the
same direction. Since two sets of coils and magnets are provided, the efficiency of the magnetic
driving force applied to the bobbin 19 and the diaphragm 14 based on the voice current is
improved, the sensitivity is improved, and the sound quality is improved. The bobbin 19 which is
the movable portion is elastically supported so as to be able to vibrate by the damper having a
two-stage structure, but since the space is formed on the outer peripheral portion of the outer
wall 19b of the bobbin 19 which is the movable portion It can be arranged.
[0027]
An upper damper 15 a and a lower damper 15 b are attached to an outer peripheral surface 19 d
of the outer wall 19 b of the bobbin 19. The upper damper 15a and the lower damper 15b are
formed of multiple wave-deformed parts concentrically with the center line OO as a center, and
made of, for example, a paper material or the like. An outer edge portion of the upper damper 15
a is joined to a step 11 d provided to the horn frame 11, and an outer edge portion of the lower
damper 15 b is joined to a step 12 d provided to the base end frame 12. The inner edge of the
upper damper 15a is joined to the joint 19e on the upper end side of the outer circumferential
surface 19d, and the inner edge of the lower damper 15b is joined to the joint 19f on the
proximal end of the outer circumferential surface 19d. The bobbin 19 is elastically supported by
both the dampers 15a and 15b, and can be vibrated in the Y direction by the deformation of the
two dampers 15a and 15b.
[0028]
In the speaker A1, since the upper end side and the base end side of the bobbin 19 are supported
by the dampers 15a and 15b, the support of the bobbin 19 is stable. Therefore, even if the
vibration amplitude of the bobbin 19 is large, such as for low sound or high output, the bobbin
19 as the movable portion can be stably supported, and the linearity of the magnetic drive can be
secured. In particular, in the configuration shown in FIG. 1, two sets of magnets and coils are
provided, and the axial length D of the magnetic drive unit M1 is long, but the bobbin 19 is
supported by two stages of dampers Thereby, the bobbin 19 can be stably operated in the long
magnetic drive unit M1. Therefore, the gaps G1 and G2 in the long magnetic drive unit M1 can
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be made as short as possible, and the magnetic drive efficiency can be enhanced.
[0029]
Further, in the magnetic drive unit M1, the outer wall 19b of the bobbin 19 which is a part of the
movable portion is located on the outermost side. Therefore, a space portion in which no other
member intervenes is formed between the outer peripheral surface 19 d of the bobbin 19 and
the horn frame 11 and the base end frame 12. Since both the dampers 15a and 15b are provided
in this space, the arrangement interval between the damper 15a and the damper 15b can be set
arbitrarily, and the distance between the joint portions 19e and 19f of the damper 15a and the
damper 15b in the bobbin 19 is magnetically driven. It becomes possible to fit within the axial
dimension of the portion M1 (the distance between the upper and lower edges of the coils C1
and C2 or the distance between the upper and lower edges of the magnets 18a and 18b) D, and a
thinner speaker can be realized.
[0030]
FIG. 2 shows a second configuration example of the speaker according to the present invention,
in which (A) is a cross-sectional view and (B) is a partially enlarged view showing the magnetic
drive unit of (A). In the magnetic drive portion M2 of the speaker A2 shown in the second
configuration example, the inside of the tip portion of the fixed portion (center pole) 22a
integrally provided with the base end frame 22 is formed of a cylindrical high magnetic material
The circumferential yoke (opposing yoke) 27a is fixed, and the coils C1 and C2 wound around
the OO axis are fixed to the outer circumferential surface of the inner circumferential yoke 27a.
Molded spacers 31 of nonmagnetic material are provided between the coils C1 and C2 and above
and below each coil. The mold spacer 31 serves as a reference for aligning and winding the coils
C1 and C2.
[0031]
A cylindrical body is joined to the back surface of the central portion of the diaphragm 24. This
cylindrical body is composed of an upper cylindrical body 29a and a lower cylindrical body 29b.
Although the upper cylindrical body 29a and the lower cylindrical body 29b are formed of a
nonmagnetic material such as paper or a resin material, the space between the upper cylindrical
body 29a and the lower cylindrical body 29b is formed into a cylindrical shape by a magnetic
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material of high magnetic permeability. It is connected by the thin outer peripheral yoke (support
yoke) 27b formed. The movable portion B is constituted by the upper cylindrical body 29a, the
lower cylindrical body 29b and the outer peripheral yoke 27b. Cylindrical magnets 28 a and 28 b
are fixed to upper and lower portions on the inner peripheral side of the outer peripheral yoke
27 b, respectively. Magnets 28a and 28b are provided at positions facing coils C1 and C2,
respectively, and a gap G1 is formed between coil C1 and magnet 28a, and similarly, a gap G2 is
formed between coil C2 and magnet 28b. Is formed.
[0032]
In the above, the magnetic drive unit M2 is configured by the inner peripheral yoke 27a, the
outer peripheral yoke 27b, the magnets 28a and 28b, the coils C1 and C2, and the gaps G1 and
G2. The magnets 28a and 28b are magnetized such that the magnetic poles of the surfaces facing
the coils C1 and C2 are opposite to each other, and a closed magnetic path is formed as in the
first configuration example. Further, the coils C1 and C2 are formed in opposite winding
directions. Therefore, when a predetermined voice current is applied to the coils C1 and C2, a
magnetic driving force in the same direction is applied to both the magnets 28a and 28b.
[0033]
The movable portion B is supported by the upper damper 25a and the lower damper 25b. The
upper damper 25 a is provided between the outer peripheral surface of the upper cylindrical
body 29 a and the step 21 a of the horn frame 21. The lower damper 25 b is provided between
the outer peripheral surface of the lower cylindrical body 29 b and the step 22 b of the base end
frame 22. Therefore, also in the speaker A2, as in the first configuration example, the
rectilinearity with respect to the OO axis can be made excellent when the movable portion B
vibrates in the Y-axis direction. Further, the gap G1 and the gap G2 can be always made uniform
during vibration, and the gaps G1 and G2 can be minimized to improve the magnetic drive
efficiency.
[0034]
Further, in the magnetic drive unit M2, since the movable portion B is disposed at the outermost
side, there is a space portion where nothing intervenes between the outer peripheral surface of
the movable portion B and the horn frame 21 and the base end frame 22. It is formed. Since the
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upper damper 25a and the lower damper 25b are disposed in this space, the distance between
the dampers can be set arbitrarily. For example, the dampers 25a and 25b can be disposed
within the length dimension of the magnetic drive unit M2. It is possible. Furthermore, in the one
shown in FIGS. 2A and 2B, the yoke 27a facing the magnets 28a and 28b is provided on the fixed
part 22a side, and the movable part B is a cylinder 29a and 29b, the yoke 27b and the magnets
28a and 28b. As compared with that shown in FIG. 1, the weight of the movable part can be
reduced, and as a result, the magnetic drive sensitivity becomes excellent.
[0035]
Next, an assembling operation of the speaker A1 of the first configuration example and the
speaker A2 of the second configuration example will be described. In the first configuration
example shown in FIG. 1A, the yokes 17a and 17b and the magnets 18a and 18b are integrally
incorporated with the coils C1 and C2 fixed to the fixing portion 12a of the base end frame 12.
Insert the bobbin 19 and attach the lower damper 15b between the bobbin 19 and the base end
frame 12, then fix the horn frame 11 with the screw 20, attach the upper damper 15a between
the bobbin 19 and the horn frame 11, and then By attaching the diaphragm 14, the assembly can
be completed. Also in the configuration example shown in FIG. 2, the assembly procedure is the
same.
[0036]
In the above assembly operation, all of the first configuration example and the second
configuration example are performed by sequentially incorporating the respective members from
the front (the upper side in the drawing), so as in the conventional example shown in FIG. The
assembling operation is easier than that of assembling. Although each of the above configuration
examples shows a magnetic drive unit in which two magnets and two coils are provided, the
present invention is also applicable to a speaker in which one magnet and one coil are provided.
That is, as long as the speaker has a structure in which the movable portion is supported by
multiple stages of dampers, an effect of thinning and easy assembly can be obtained regardless
of the application.
[0037]
As described above, according to the present invention, in the speaker capable of stabilizing the
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vibration of the movable portion by supporting the movable portion by multiple stages of
dampers, the arrangement interval of the dampers is arbitrarily determined, and The
arrangement interval of the dampers can be shortened, and a thin design can be realized. In
addition, the members can be assembled from one side of the frame, which facilitates the
assembly operation.
[0038]
Further, the weight of the movable portion can be reduced by providing the yoke facing the
magnet on the fixed portion side.
[0039]
Brief description of the drawings
[0040]
1 shows a first configuration example of the present invention, (A) is a cross-sectional view of a
speaker, (B) is a partially enlarged view showing a magnetic drive unit in (A),
[0041]
2 shows a second configuration example of the present invention, (A) is a cross-sectional view of
the speaker, (B) is a partially enlarged view showing the magnetic drive portion in (A),
[0042]
Figure 3 Cross section of a conventional speaker,
[0043]
Explanation of sign
[0044]
11, 21 horn frame 12, 22 base end frame 12a, 22a fixing portion 14, 24 diaphragm 15a, 25a
upper damper 15b, 25b lower damper 17a, 27a inner peripheral yoke 17b, 27b outer peripheral
yoke 18a, 18b, 28a, 28b magnet 19 Bobbin B Movable Part A1 Speaker A2 of the First
Configuration Example Speakers C1 and C2 of the Second Configuration Example Coils G1 and
G2 Gaps M1 and M2 Magnetic Drive Section
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