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JP2009194460

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DESCRIPTION JP2009194460
An object of the present invention is to provide a "speaker" which is easy to set a narrow
magnetic gap and is easy to disassemble for recycling. A diaphragm 1 in which a voice coil 2 is
formed in a planar coil shape near one end, and both ends of the diaphragm 1 via elastic
members 3 and 4 so that a central portion of the diaphragm 1 is curved. And a magnetic circuit 6
attached to the frame 5 with a magnetic gap G in which the voice coil 2 is disposed, the magnetic
circuit 6 being constituted by the magnets 8 and 9 and the yokes 10 and 11 Speaker, which
connects the components of the magnetic circuit 6 by the magnetic force of the magnets 8 and 9
and defines the gap dimension between the opposing magnets 8 and 9 and the yoke 10 with the
magnetic gap G in between. In order to interpose the spacer member 7 for this, it was made to
pinch by the magnetic force of the magnets 8 and 9. [Selected figure] Figure 7
スピーカ
[0001]
The present invention relates to a speaker that vibrates a diaphragm by energizing a voice coil in
a magnetic gap, and more particularly to a speaker in which a voice coil is formed in a planar coil
shape in the vicinity of an end of the diaphragm.
[0002]
In this type of speaker, a voice coil is provided in the vicinity of the end of a rectangular
diaphragm or the like and driven in the plate surface direction to vibrate the central portion of
the curved diaphragm in a direction orthogonal to the plate surface. It is said that.
13-05-2019
1
The voice coil is formed in the form of a flat coil in the vicinity of the end of the diaphragm by,
for example, etching, and the end of the diaphragm is supported by the frame via a damper or
the like. A magnetic circuit consisting of a magnet and a yoke is attached to the frame, and a
voice coil is disposed in the magnetic gap of the magnetic circuit. The electromagnetic driving
force works along the
[0003]
In the speaker of this type which has been proposed conventionally, the magnet and the yoke
which constitute the magnetic circuit are fixed at a predetermined position of the frame by
means such as adhesion, and the gap size of the magnetic gap is the attachment of the magnetic
circuit component It is prescribed by the position and the part size (for example, refer to patent
documents 1). Then, if the magnetic gap is set to be narrow, a speaker with high drive efficiency
can be obtained. Therefore, the magnet is polished and the gap size accuracy is obtained. Patent
2662866
[0004]
However, in the conventional speaker described above, the gap size is dispersed due to the
accumulated tolerance of the components of the magnetic circuit, so the magnetic gap can not be
set too narrow, and hence there is a problem that the driving efficiency is difficult to improve .
Further, in the above-described conventional speaker, the components of the magnetic circuit or
the components and the frame are firmly fixed by adhesion or the like, so it is also difficult to
disassemble and recycle them. there were.
[0005]
The present invention has been made in view of the circumstances of the prior art as described
above, and an object thereof is to provide a speaker which is easy to set a narrow magnetic gap
and easy to disassemble for recycling. is there.
[0006]
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2
In the present invention, the components of the magnetic circuit are connected by the magnetic
force (magnetic attraction force) of a magnet which is a part of the components.
Further, a member having a spacer function and a projection are interposed between the magnet
and the yoke facing each other with the magnetic gap, and the magnetic force sandwiches the
member.
[0007]
In the speaker of the present invention, the components of the magnetic circuit are connected to
each other by the magnetic force of the magnet facing the magnetic gap, so that the components
of the magnetic circuit can be easily disassembled and recycled. In addition, since the spacer
member is sandwiched between the opposing magnet and the yoke with the magnetic gap, the
gap dimension is not affected by the cumulative tolerance of the components of the magnetic
circuit, and hence the gap dimension accuracy is enhanced. This makes it easy to set the
magnetic gap narrow.
[0008]
The speaker according to the present invention elastically supports a diaphragm in which a voice
coil is formed in a planar coil shape near at least one end, and both ends of the diaphragm so
that a central portion of the diaphragm is curved. A speaker comprising: a frame; and a magnetic
circuit having a magnetic gap in which the voice coil is disposed and attached to the frame,
wherein the speaker is configured to vibrate the diaphragm by energizing the voice coil. Magnet
and yoke are connected by the magnetic force of the magnet, and spacer means is interposed
between the magnet and the yoke facing each other with the magnetic gap therebetween, and the
spacer means is clamped by the magnetic force of the magnet. Configured to
[0009]
In the speaker configured as described above, the components of the magnetic circuit are
connected to each other by the magnetic force (magnetic attraction force) of the magnet facing
the magnetic gap, so that there is no need to bond the components of the magnetic circuit. It is
easy to disassemble and recycle circuit components.
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3
Further, in this speaker, the spacer means is interposed between the magnet and the yoke facing
each other with the magnetic gap, utilizing the magnetic force of the magnet, so the gap
dimension can be defined by the spacer means. That is, since the gap size is not affected by the
accumulated tolerance of the components of the magnetic circuit, it is easy to increase the
accuracy of the gap size and set the magnetic gap narrow, and it is easy to improve the driving
efficiency of the speaker.
[0010]
In the above configuration, if the spacer means is a spacer member made of a nonmagnetic
material, the gap dimension of the magnetic gap can be defined only by the thickness of the
spacer member. The dimensional accuracy is significantly increased. Therefore, it is not
necessary to grind the magnet, etc., and it is possible to easily realize a speaker with high driving
efficiency with a narrow magnetic gap although it is inexpensive.
[0011]
Further, in the above configuration, when the spacer member as the spacer means is disposed at
a portion not overlapping the diaphragm, and the thickness of the spacer member is set larger
than the thickness of the diaphragm, the thickness of the spacer member Since it is possible to
define the gap size of the magnetic gap only by itself, the accuracy of the gap size is significantly
enhanced without increasing the dimensional accuracy of the components of the magnetic
circuit. Therefore, it is not necessary to grind the magnet, etc., and a speaker having a narrow
magnetic gap and high driving efficiency can be easily realized although it is inexpensive. In this
case, an independent piece of spacer member may be sandwiched between the magnet and the
yoke, but if the spacer member is integrated with the magnet or the yoke in advance, no
additional spacer member is required, so the cost of parts is increased. It is possible to reduce
and simplify the assembly work.
[0012]
In the above configuration, the projection as the spacer means is integrally formed on the
diaphragm, and the diaphragm is pinched together with the projection by the magnet and the
yoke facing each other with the magnetic gap therebetween. Since the gap size of the magnetic
gap can be defined by the thickness of the diaphragm including the projection without adding a
spacer member separately, the number of parts can be reduced and the accuracy of the gap size
can be increased extremely inexpensively. Become.
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4
[0013]
Further, in the above configuration, the frame includes a main body portion supporting the
diaphragm and a folded portion foldably connected to the main body portion via a hinge portion,
and a part of the magnetic circuit is If it is incorporated in the main body and the other part is
incorporated in the turnback, the components of the magnetic circuit are respectively
incorporated in predetermined positions without forming the magnetic gap in which the main
body of the frame and the turnback are developed. Then, when the folded back portion is turned
toward the main body portion, the main body portion and the folded back portion are held in the
facing posture by the magnetic force of the magnet, so that the magnetic gap is automatically
formed.
Therefore, the assembly work of the speaker is extremely good.
[0014]
The embodiment will be described with reference to the drawings. FIG. 1 is a cross-sectional view
of a speaker according to a first embodiment of the present invention, FIG. 2 is a top view of the
main part showing the vicinity of a voice coil of the speaker, FIG. 4 is a top view of the diaphragm
used, FIG. 4 is a perspective view of the speaker, FIG. 5 is an exploded perspective view of the
speaker, and FIGS. 6 and 7 are explanatory views showing an assembling procedure of the
speaker.
[0015]
The speaker shown in FIGS. 1 to 5 has a rectangular diaphragm 1 in which a voice coil 2 is
formed in a planar coil shape in the vicinity of the lower end portion, and upper and lower end
portions of the diaphragm 1 via elastic members 3 and 4. Mainly composed of a supporting
frame 5, a magnetic circuit 6 having a magnetic gap G and attached to the opening 5a of the
frame 5, and a pair of spacer members 7 for defining the gap dimension of the magnetic gap G .
The magnetic circuit 6 is formed of rod-like magnets 8 and 9 and plate-like yokes 10 and 11, and
a magnetic gap G is formed between the pole faces of the magnets 8 and 9 and the yoke 10.
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5
[0016]
The diaphragm 1 is supported by the frame 5 so that the lower part is flat and the central part is
curved. However, the elastic member 3 for locking the upper end portion of the diaphragm 1 and
the elastic member 4 for locking the lower end portion of the diaphragm 1 are both made of
rubber or the like and are easily elastically deformed. Both ends are elastically supported by the
frame 5. The voice coil 2 is formed in the vicinity of the end of the diaphragm 1 by etching or the
like, and its shape is a flat coil as shown in FIG. The voice coil 2 is disposed in the magnetic gap
G, and a current (sound signal) is supplied in the direction indicated by the arrow in FIG. 3
through the terminal portions 2a and 2b.
[0017]
The frame 5 is made of synthetic resin, and as shown in FIG. 1 and FIG. 5, it is molded in such a
shape that a predetermined part can be fitted into a plurality of places on the inner wall surface.
For example, V grooves are formed in the upper and lower portions of the frame 5 for fitting the
elastic members 3 and 4 respectively, and a recess for fitting the yokes 10 and 11 in the opening
5a of the frame 5 is provided. It is formed.
[0018]
The magnets 8 and 9 of the magnetic circuit 6 use two identical parts, and these magnets 8 and
9 are attracted and fixed to the concave grooves 11a and 11b of the yoke 11 by their own
magnetic force. However, the magnets 8 and 9 face mutually different pole faces (for example, N
pole and S pole) to the yoke 11. That is, the magnets 8 and 9 have mutually different magnetic
pole faces directed to the yoke 10 through the voice coil 2, and the direction of the current
flowing through the voice coil 2 is in the region facing the magnet 8 and the region facing the
magnet 9 The direction is reversed (the magnitude of the current is the same). As a result, the
electromagnetic coil of the same magnitude is applied to the voice coil 2 in the same direction at
any time when the voice coil 2 is energized.
[0019]
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6
The spacer member 7 is a prismatic molded product made of a nonmagnetic material. The pair of
spacer members 7 is a combination of two identical parts, and is incorporated in the opening 5 a
of the frame 5 at the left and right ends that do not interfere with the diaphragm 1. As shown in
FIG. 2, the pair of spacer members 7 is interposed between the magnets 8 and 9 and the yoke 10
on the side adjacent to the voice coil 2. Then, each spacer member 7 is sandwiched between the
yoke 10 and the magnets 8 and 9 by the magnetic force (magnetic attraction force) of the
magnets 8 and 9 with respect to the yoke 10. It is defined by the thickness.
[0020]
When assembling the loudspeaker according to the present embodiment, first, as shown in FIG.
6, the yoke 10 is inserted into the opening 5a of the frame 5 and fitted into a predetermined
position (recessed portion). The elastic members 3 and 4 are fitted in predetermined positions (V
grooves) in the lower part. Next, as shown in FIG. 7, the diaphragm 1 is mounted on the frame 5
by abutting the upper end and the lower end of the diaphragm 1 on which the voice coil 2 is
formed against the elastic members 3 and 4 respectively. Thereafter, the pair of spacer members
7 is assembled to the left and right ends in the opening 5 a of the frame 5. After that, an integral
product formed by attracting and fixing the magnets 8 and 9 to the concave grooves 11a and
11b of the yoke 11 is inserted into the opening 5a of the frame 5, and the yoke 11 is fitted into a
predetermined position (recessed portion). As a result, the magnets 8 and 9 attract the yoke 10
and hold the pair of spacer members 7 in a pinched state, so that a magnetic gap G having a
predetermined gap size is formed, and a speaker as shown in FIG. Complete.
[0021]
In the speaker configured as described above, when an audio signal is supplied to the voice coil 2
in the magnetic gap G, an electromagnetic driving force along the plate surface direction of the
diaphragm 1 acts on the voice coil 2. The central portion of 1 vibrates in a direction
perpendicular to the plate surface to generate a sound pressure.
[0022]
As described above, in the loudspeaker according to this embodiment, the magnets 8 and 9
constituting the magnetic circuit 6 are connected to the yokes 10 and 11 by the magnetic force
(magnetic attraction force) of the magnets 8 and 9 facing the magnetic gap G. As a result, there is
no need to bond the components of the magnetic circuit together, and it is thus easy to
disassemble and recycle the components of the magnetic circuit.
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7
Moreover, in this speaker, the yokes 10 and 11 and the elastic members 3 and 4 and the like are
fitted to the frame 5 without using an adhesive, and all parts are disassembled and recycled. As
well as being easy to separate and separate, the assembly operation can be performed extremely
smoothly.
[0023]
Further, in the loudspeaker according to the present embodiment, the spacer member 7 is
sandwiched between the magnets 8 and 9 facing the magnetic gap G and the yoke 10 using the
magnetic force of the magnets 8 and 9, The gap dimension can be defined only by the thickness
of the spacer member 7. That is, since the gap size is not affected by the accumulated tolerances
of the components of the magnetic circuit (errors of the mounting positions of the yokes 10 and
11 with respect to the frame 5 and the mounting positions of the magnets 8 and 9 with the yoke
11) It is easy to increase the accuracy and set the magnetic gap G narrow. Therefore, this speaker
does not require polishing of the magnets 8 and 9 and is easy to increase the driving efficiency
while being inexpensive.
[0024]
8 is a cross-sectional view of a loudspeaker according to a second embodiment of the present
invention, FIG. 9 is a perspective view of the loudspeaker, FIG. 10 is an exploded perspective view
of the loudspeaker, and FIGS. It is a figure, and since the same code | symbol is attached |
subjected to the part corresponding to FIGS. 1-7, the overlapping description is abbreviate |
omitted.
[0025]
In the loudspeaker according to the second embodiment, the frame 5 is composed of a main body
5b and a folded back 5c, and the folded back 5c is foldably connected to the main body 5b via a
thin hinge 5d, This is largely different from the first embodiment described above.
However, the frame 5 used in the second embodiment is made of a flexible resin material such as
polypropylene. The upper and lower end portions of the diaphragm 1 are supported by the main
body portion 5 b via the elastic members 3 and 4, and one of the yoke 10 of the magnetic circuit
13-05-2019
8
6 and a pair defining the gap size of the magnetic gap G And the spacer member 7 of FIG. The
other yoke 11 of the magnetic circuit 6 and the magnets 8 and 9 are incorporated in the folded
back portion 5c.
[0026]
When assembling the speaker according to the second embodiment, first, the yoke 10 and the
elastic members 3 and 4 are respectively incorporated into the main body 5b in the same
procedure as the first embodiment described above. Are attached to the main body 5b, and the
pair of spacer members 7 are assembled into the main body 5b. Next, as shown in FIG. 11, the
yoke 11 is inserted into the first insertion opening 51 of the folded back portion 5c and
assembled, and then the magnets 8, 9 are inserted into the second insertion opening 52 and the
third insertion opening 53, respectively. Is inserted and fixed to the yoke 11 by suction. After
that, as shown in FIG. 12, the magnets 8 and 9 attract the yoke 10 and turn the pair of spacer
members 7 into a pinched state by turning the folded back portion 5c toward the main body 5b
in the arrow direction. Therefore, a magnetic gap G having a predetermined gap size is formed,
and a speaker as shown in FIG. 9 is completed.
[0027]
As described above, in the second embodiment, each component of the magnetic circuit 6 is
incorporated at a predetermined position in a state where the magnetic gap in which the main
body 5b and the folded back portion 5c of the frame 5 are unfolded is not formed. Then, when
the folded back portion 5c is turned toward the main body portion 5b, the main body portion 5b
and the folded back portion 5c are held in the facing posture by the magnetic force (magnetic
attraction force) of the magnets 8 and 9, Will be formed automatically. Therefore, the assembly
operation of the speaker is extremely good, and dimensional accuracy among the components of
the magnetic circuit 6 can be easily obtained.
[0028]
In the first and second embodiments, the magnets 8 and 9 extend to the positions protruding
from the left and right ends of the voice coil 2 and abut on the spacer member 7, but the left and
right ends of the voice coil 2 are desired. The coils 8 and 9 may be shortened so as not to face
the left and right end portions of the voice coil 2 because the coil ineffective portion does not
13-05-2019
9
generate an electromagnetic driving force in the direction. In this case, although the spacer
member 7 can not be pressed directly against the magnets 8 and 9, for example, a spacer
member made of a material excellent in slidability using a rubber magnet or a plastic magnet as
the magnet is the diaphragm 1 and the yoke 10 If the spacer member and the diaphragm 1 are
sandwiched between the magnet and the yoke 10, the speaker 1 is suitable as a speaker for
middle to high frequency range where the amplitude of the diaphragm 1 is small. It becomes.
[0029]
In the first and second embodiments, the separate piece spacer members 7 are sandwiched
between the magnets 8 and 9 and the yokes 10 and 11, but the spacer members 7 are previously
made to be the magnets 8, 9 or yokes If it is integrated to 10 and 11, since the spacer member is
not required separately, it is possible to reduce parts cost and simplify the assembly work.
[0030]
In the first and second embodiments, the voice coil 2 is formed in the form of a planar coil in the
vicinity of one end of the diaphragm 1, but the voice coil is formed in the form of a planar coil in
the vicinity of both ends of the diaphragm. The present invention is also applicable to the case of
the speaker.
[0031]
FIG. 13 is a cross-sectional view of an essential part of a speaker according to a third
embodiment of the present invention, FIG. 14 is a perspective view of an essential part of a
diaphragm used in the speaker, and the parts corresponding to FIG. Duplicate descriptions will be
omitted.
[0032]
In the loudspeaker according to the third embodiment, a large number of protrusions 1a are
formed on the diaphragm 1 by dimple processing, and the magnet 80 made of rubber or plastic
is pressed in a state where the protrusions 1a are pressed against the yoke 10. The diaphragm 1
is sandwiched in the magnetic gap G by the magnetic force (magnetic attraction force) to the
yoke 10 of 90.
Therefore, the gap dimension of the magnetic gap G is defined by the thickness of the diaphragm
1 including the voice coil 2 and the projection height of the protrusion 1a, and the spacer
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10
member used in the first and second embodiments described above is It is omitted.
[0033]
As described above, in the third embodiment, the gap dimension of the magnetic gap G can be
defined by the thickness of the diaphragm 1 including the projection 1a without adding a spacer
member separately, so that the number of parts can be reduced and the cost is reduced. The gap
size can be set extremely narrow.
Further, since the projections 1a formed on the diaphragm 1 by dimple processing have a small
contact area with the yoke 10 and small frictional resistance, the diaphragm 1 can be vibrated
smoothly.
[0034]
In the third embodiment, the hemispherical projections 1a are formed on one side of the
diaphragm 1, but the shape, size, number, etc. of the projections 1a can be appropriately
selected, and the projections 1a can be selected. It may be formed on both sides of the diaphragm
1.
In addition, a lubricating means (for example, a tape made of polytetrafluoroethylene, oil, etc.)
made of a nonmagnetic material is disposed between the diaphragm 1 and the magnets 8 and 9
and the diaphragm 1 and the yoke 10 in which the projection is not formed. The same effect as
in the third embodiment can be obtained by interposing the.
[0035]
FIG. 1 is a cross-sectional view of a speaker according to a first embodiment of the present
invention. It is an important section top view showing the voice coil neighborhood of the speaker
concerning a 1st example. It is a top view of the diaphragm used with the speaker concerning a
1st example. It is a perspective view of the speaker concerning a 1st example. It is an exploded
perspective view of a speaker concerning a 1st example. It is explanatory drawing which shows
the assembly procedure of the speaker which concerns on 1st Example. It is explanatory drawing
13-05-2019
11
which shows the assembly procedure of the speaker which concerns on 1st Example. It is
sectional drawing of the speaker based on 2nd Example of this invention. It is a perspective view
of the speaker concerning a 2nd example. It is a disassembled perspective view of the speaker
concerning 2nd Example. It is explanatory drawing which shows the assembly procedure of the
speaker which concerns on 2nd Example. It is explanatory drawing which shows the assembly
procedure of the speaker which concerns on 2nd Example. It is principal part sectional drawing
of the speaker based on 3rd Example of this invention. It is a principal part perspective view of
the diaphragm used by the speaker concerning 3rd Example.
Explanation of sign
[0036]
DESCRIPTION OF SYMBOLS 1 diaphragm 1a protrusion part 2 voice coil 3, 4 elastic member 5
frame 5b main-body part 5c return part 5d hinge part 6 magnetic circuit 7 spacer member 8, 9,
80, 90 magnet 10, 11 yoke G magnetic gap
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