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JP2009171475

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DESCRIPTION JP2009171475
PROBLEM TO BE SOLVED: To provide a ring type speaker capable of achieving both
improvement of acoustic characteristics such as frequency characteristics including suppression
of unnecessary vibration and abnormal noise, easy assembly and reduction of man-hours, and a
method of manufacturing the same. SOLUTION: A ring-type speaker includes a diaphragm fixing
member for fixing a ring diaphragm, and an equalizer is disposed on the inner periphery of the
ring diaphragm and insert-molded on an inner peripheral plate made of an annular magnetic
body. An inner peripheral portion, an outer peripheral portion formed by insert molding an outer
peripheral plate formed of an annular magnetic body, disposed on an outer periphery of the ring
diaphragm, and a plurality of connecting arms integrally connecting the inner peripheral portion
and the outer peripheral portion; And one of the diaphragm fixing members is an inner
peripheral fixed magnet for holding the inner peripheral end of the ring diaphragm between
itself and the inner peripheral plate of the equalizer with a magnetic force, and the other of the
diaphragm fixing members is the equalizer It is an outer peripheral fixed magnet which holds the
outer peripheral end of the ring diaphragm between itself and the outer peripheral plate by
magnetic force. [Selected figure] Figure 1
Ring-type speaker and method of manufacturing the same
[0001]
The present invention relates to a ring-type speaker provided with an annular ring diaphragm
and a method of manufacturing the same.
[0002]
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1
Some conventional ring-type speakers have an equalizer, a horn, and the like attached to the
front of an annular ring diaphragm in order to improve acoustic characteristics such as
frequency characteristics and directivity characteristics.
Ring-type loudspeakers with an annular ring diaphragm are often used as tweeters for the high
range. The ring diaphragm is fixedly supported on the inner periphery, and the acoustic
characteristics in the high frequency range are improved by arranging a shell-shaped equalizer of
a size comparable to the outer diameter of the ring diaphragm on the inner periphery of the ring
diaphragm (Patent Document 1).
[0003]
In the conventional ring-type speaker by the applicant of the present invention, it is necessary to
achieve both improvement of acoustic characteristics such as frequency characteristics including
suppression of unnecessary vibration and abnormal noise, ease of assembly and reduction of the
number of parts and man-hours. Magnetic circuit, a voice coil disposed in the magnetic gap of
the magnetic circuit, an annular ring diaphragm to which the voice coil is connected, and a shellshaped equalizer disposed on the inner periphery of the ring diaphragm; A ring-type speaker
comprising: an annular equalizer disposed on an outer periphery of a ring diaphragm; and a
plurality of radially extending plate-like connecting arms connecting a shell-shaped equalizer and
an annular equalizer, wherein the connecting arms are A first ridge line represented by an arc
passing through the top end of the bullet-like equalizer in the radial cross-sectional shape, and a
bullet-like equalizer in the radial cross-sectional shape There are those so provided and a second
ridge line represented by an arc passing through the bottom end, a plate-shaped portion
connecting the first ridge and the second ridge, the (Patent Document 2).
[0004]
In particular, in the case of a ring type speaker provided with a connected equalizer in which a
bullet-shaped equalizer, a connected arm and an annular equalizer are integrally resin-molded,
the connected equalizer is integrally resin-molded by the connected arm, further facilitating
assembly and the number of parts And the reduction of man-hours can be realized.
However, in the ring-type speaker according to the prior art, it may be difficult to achieve both
improvement in acoustic characteristics and ease of assembly and reduction in the number of
parts and the number of steps. Even in the case of a ring-type speaker provided with a coupling
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2
equalizer, a divided vibration may be generated at a low frequency to define a reproduction
frequency band depending on the fixing method of the inner peripheral end and the outer
peripheral end of the annular ring diaphragm. There is a problem that the limit frequency fh is
lowered, and in some cases, unnecessary vibration is excited, abnormal noise is generated due to
the vibration, or sound quality is deteriorated.
[0005]
In addition, the fixing method of the inner peripheral end and the outer peripheral end of the
annular ring diaphragm is such that the ring diaphragm is fixed to the bottom surface of the
equalizer and the magnetic circuit as described in the embodiment of Patent Document 2. In
addition to the case of sandwiching with an adhesive, bonding may be performed. Alternatively,
there is a conventional electromagnetic sounder in which a pressing material, which is a
magnetic material, is disposed on the outer periphery of a suspension (Patent Document 3). The
ring-shaped pressing member 7 a which is a magnetic material suppresses the floating of the
outer periphery of the suspension 7 also by the magnetic attraction by the magnet 2.
[0006]
JP-A-57-158285 (FIG. 2) JP-A-2006-100879 (FIG. 1, FIG. 6) JP-A-2001-209388 (FIG. 2)
[0007]
The present invention has been made to solve the problems of the prior art described above, and
its object is to improve acoustic characteristics such as frequency characteristics including
suppression of unnecessary vibration and abnormal noise, and to facilitate assembly. It is an
object of the present invention to provide a ring-type speaker and a method of manufacturing the
same that can achieve both reductions in manufacturing time and man-hours.
[0008]
The ring type speaker according to the present invention is a magnetic circuit, a voice coil
disposed in a magnetic gap of the magnetic circuit, an annular ring diaphragm to which the voice
coil is connected, and two magnetized annular magnets. A ring type speaker comprising a
diaphragm fixing member for fixing a ring diaphragm and an equalizer molded of a resin
connected to a magnetic circuit, wherein the equalizer is disposed on the inner periphery of the
ring diaphragm and is annular An inner peripheral portion formed by insert molding an inner
peripheral plate made of a magnetic body, and an outer peripheral portion formed by insert
molding an outer peripheral plate made of an annular magnetic body disposed on the outer
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periphery of a ring diaphragm, an inner peripheral portion and an outer peripheral portion And a
plurality of connecting arm portions that integrally connect the inner peripheral solid state in
which one of the diaphragm fixing members sandwiches the inner peripheral end portion of the
ring diaphragm with the inner peripheral plate of the equalizer with a magnetic force A magnet, a
periphery fixed magnet holding magnetically outer peripheral edge of the ring diaphragm
between the outer plate and the other of the equalizer of the vibration plate fixing member.
[0009]
Preferably, in the ring speaker according to the present invention, the magnetic circuit is inside
the space defined by the magnetic gap, the inner peripheral end of the ring diaphragm, and the
inner peripheral end of the inner peripheral fixed magnet of the diaphragm fixing member, and ,
And an inner peripheral end of an inner peripheral plate of the equalizer.
[0010]
Preferably, in the ring-type speaker according to the present invention, the equalizer includes a
positioning convex portion which is fitted into and protruded from the inner peripheral plate, the
positioning convex portion is an inner peripheral end of the ring diaphragm, and a diaphragm It
fits on the inner peripheral end of the inner peripheral fixed magnet of the fixing member.
[0011]
More preferably, in the ring-type speaker according to the present invention, the magnetic circuit
is an internal magnet type magnetic circuit including a main magnet positioned inside a
cylindrical space defined by a voice coil, and a plate disposed on the upper surface side of the
main magnet And a yoke defining a magnetic gap between the plate and the inner periphery
fixed magnet of the diaphragm fixing member is disposed on the upper surface side of the plate
to form a repulsive magnetic field in the magnetic gap with the main magnet.
[0012]
In addition, preferably, in the ring speaker according to the present invention, the magnetic
circuit is an external magnet type magnetic circuit including a main magnet located outside the
cylindrical space defined by the voice coil, and is disposed on the upper surface side of the main
magnet A plate and a pole defining a magnetic gap between the plate are provided, and an outer
peripheral fixed magnet of the diaphragm fixing member is disposed on the upper surface side of
the plate to form a repulsive magnetic field in the magnetic gap with the main magnet.
[0013]
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More preferably, in the ring-type speaker according to the present invention, the inner fixed
magnet and the outer fixed magnet of the diaphragm fixing member further include a
nonmagnetic ring covering a part of the annular magnet.
[0014]
Further, according to the method of manufacturing a ring-type speaker of the present invention,
a magnetic circuit, a voice coil disposed in a magnetic gap of the magnetic circuit, an annular ring
diaphragm to which the voice coil is coupled, and two magnetized circles A manufacturing
method of a ring type speaker comprising an annular magnet, a diaphragm fixing member for
fixing a ring diaphragm, and an equalizer molded of a resin connected to a magnetic circuit,
which is disposed on the inner periphery of the ring diaphragm To form an equalizer including
an inner circumferential portion to be formed, an outer circumferential portion disposed on the
outer circumferential surface of the ring diaphragm, and a plurality of connecting arm portions
integrally linking the inner circumferential portion and the outer circumferential portion, and the
inner circumferential portion And the step of insert-molding the inner and outer peripheral
plates of the annular magnetic material on the outer and outer peripheral portions respectively,
the inner peripheral fixed magnet which is one of the diaphragm fixing members and the inner
peripheral plate of the equalizer Between the step of holding the inner peripheral end of the ring
diaphragm with a magnetic force, and the outer peripheral end of the ring diaphragm between
the outer peripheral fixed magnet which is the other of the diaphragm fixing member and the
outer peripheral plate of the equalizer. And b.
[0015]
Hereinafter, the operation of the present invention will be described.
[0016]
The ring type speaker according to the present invention comprises a magnetic circuit, a voice
coil disposed in a magnetic gap of the magnetic circuit, an annular ring diaphragm to which the
voice coil is coupled, and a diaphragm fixing member for fixing the ring diaphragm. And a resin
molded equalizer coupled to the magnetic circuit.
When an audio signal current is supplied to the voice coil, driving force is generated in the voice
coil in the magnetic gap of the magnetic circuit, and the ring diaphragm vibrates to reproduce
sound.
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The equalizer fixes the ring diaphragm together with the diaphragm fixing member, while
adjusting the wave front of reproduced sound to suppress the peak dip of the frequency
characteristic.
[0017]
The equalizer is disposed on the inner periphery of the ring diaphragm and has an inner
peripheral portion formed by insert molding an inner peripheral plate made of an annular
magnetic body, and an outer periphery arranged on the outer periphery of the ring diaphragm
and made of an annular magnetic body The plate includes an outer peripheral portion formed by
insert molding, and a plurality of connecting arm portions integrally connecting the inner
peripheral portion and the outer peripheral portion.
Since the resin-molded equalizer has the inner and outer circumferences connected by a plurality
of connecting arms, unnecessary vibration and noise in the equalizer can be suppressed to
reduce the ease of assembly and reduce the number of parts and man-hours. can do.
[0018]
The inner peripheral portion of the equalizer disposed on the inner periphery of the ring
diaphragm is insert-molded with an inner peripheral plate made of an annular magnetic body.
The outer peripheral portion of the equalizer disposed on the outer periphery of the ring
diaphragm is insert-molded with an outer peripheral plate made of an annular magnetic material.
The diaphragm fixing member is a pair of magnetized annular magnets, and fixes the inner
peripheral end and the outer peripheral end of the ring diaphragm to the magnetic circuit or the
equalizer.
One of the diaphragm fixing members is an inner peripheral fixed magnet, and the inner
peripheral end of the ring diaphragm is magnetically held between the insert-molded equalizer
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and the inner peripheral plate of the equalizer.
The other of the diaphragm fixing members is an outer peripheral fixed magnet, and the outer
peripheral end of the ring diaphragm is held between the outer peripheral plate of the insertmolded equalizer by a magnetic force.
Since it is not necessary to use an adhesive, the applied adhesive does not ooze out and solidify in
the portion to be vibrated of the ring diaphragm, and the fixation of the inner peripheral end and
the outer peripheral end of the ring diaphragm becomes strong The fixed part and the vibratable
part of the ring diaphragm can be clearly distinguished, and as a result, the high frequency band
limit frequency fh at which the divided vibration occurs can be raised to extend the reproduction
frequency band high, and the acoustic characteristic Improvement of the
[0019]
Furthermore, in the method of manufacturing the ring-type speaker, by providing the insertmolded equalizer and the diaphragm fixing member, the assembly can be simplified and the
number of steps can be reduced.
Since the diaphragm fixing member is two magnetized ring-shaped magnets, the insert-molded
inner and outer peripheral plates of the equalizer are attracted by magnetic force, and the inner
and outer peripheral ends of the ring diaphragm are obtained. Since the magnetic force is held by
the magnetic force, it is not necessary to use an adhesive, the assembly becomes easy, and the
number of steps required to dry the adhesive can be reduced.
By providing the diaphragm fixing member, unnecessary vibration of the equalizer and the
magnetic circuit is also suppressed, so it is possible to reduce problems such as generation of
abnormal noise due to the vibration or deterioration of sound quality.
[0020]
Preferably, in the ring speaker according to the present invention, the positioning convex portion
in which the magnetic circuit or the equalizer is fitted with the inner peripheral end of the ring
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diaphragm and the inner peripheral end of the inner peripheral fixed magnet of the diaphragm
fixing member. Equipped with The positioning convex portion regulates the fixing position of the
ring diaphragm and the diaphragm fixing member, so that the assembly jig becomes unnecessary
in the manufacturing process of the ring type speaker, and the assembly can be simplified and
the number of man-hours can be reduced.
[0021]
Further, in the ring type speaker of the present invention, even when the magnetic circuit is an
inner magnetic type magnetic circuit or an outer magnetic type magnetic circuit, an inner
peripheral fixed magnet which is one of the diaphragm fixing members, or An outer peripheral
fixed magnet, which is the other of the diaphragm fixing members, is magnetized and attached so
as to form a repulsive magnetic field in the magnetic gap together with the main magnet.
Specifically, the main magnet and the diaphragm fixing member are attached so that the same
magnetic pole approaches through the plate of the magnetic circuit. Therefore, the provision of
the diaphragm fixing member not only facilitates the assembly but also improves the magnetic
flux density of the repelling magnetic field of the magnetic gap compared to the case of the
magnetic circuit having only the main magnet, and the ring type is efficient. A speaker can be
realized.
[0022]
Further, when the ring-shaped speaker further includes a nonmagnetic ring that covers the inner
and outer fixed magnets of the diaphragm fixing member and a part of the annular magnet, the
audio signal current supplied to the voice coil The alternating magnetic flux resulting from the
cross-over to the nonmagnetic ring causes an eddy current on the surface of the nonmagnetic
ring. As a result, the AC magnetic flux passing through the diaphragm fixing member, which is a
magnet as a ferromagnetic body having hysteresis characteristics, is reduced, so that the current
distortion is reduced, and a ring type speaker having excellent distortion characteristics can be
realized. The diaphragm fixing member can not only reduce the generation of abnormal noise,
but can also improve the reproduction sound quality and the acoustic characteristics such as
harmonic distortion.
[0023]
The ring-type speaker according to the present invention and the speaker system using the same
achieve both improvement of acoustic characteristics such as frequency characteristics including
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suppression of unnecessary vibration and abnormal noise, facilitation of assembly and reduction
of man-hours. it can.
[0024]
The ring type speaker according to the present invention has a magnetic circuit and a magnetic
circuit for the purpose of achieving both improvement of acoustic characteristics such as
frequency characteristics including suppression of unnecessary vibration and abnormal noise,
facilitation of assembly and reduction of man-hours. A voice coil disposed in a magnetic gap of
the circuit, an annular ring diaphragm to which the voice coil is connected, a diaphragm fixing
member which is two magnetized annular magnets and fixes the ring diaphragm, and magnetism
A ring-type speaker comprising: an equalizer molded with a resin coupled to a circuit, wherein
the equalizer is disposed on the inner periphery of the ring diaphragm, and the inner periphery
plate made of an annular magnetic body is insert-molded A plurality of connections that
integrally connect the inner peripheral portion and the outer peripheral portion with the outer
peripheral portion insert-molded with the peripheral portion and the outer peripheral plate
which is disposed on the outer peripheral of the ring diaphragm and made of an annular
magnetic body A diaphragm fixing member, and one of the diaphragm fixing members is an
inner peripheral fixed magnet for holding the inner peripheral end of the ring diaphragm
between itself and the inner peripheral plate of the equalizer with a magnetic force; The other is
the outer peripheral fixed magnet that holds the outer peripheral end of the ring diaphragm
between the outer peripheral plate of the equalizer and the outer peripheral plate with magnetic
force.
[0025]
Hereinafter, although the ring-type speaker by the preferable embodiment of this invention and
its manufacturing method are demonstrated, this invention is not limited to these embodiment.
[0026]
FIG. 1 is a view for explaining a ring-type speaker 1 according to a preferred embodiment of the
present invention.
FIG. 1A is a perspective view of the ring type speaker 1 as viewed from the front direction, and
FIG. 1B is an exploded development view explaining the ring type speaker 1.
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The ring-type speaker 1 of the present embodiment is a speaker with a call aperture of 3 cm
used as a tweeter for high-range reproduction.
The ring-shaped speaker 1 is an equalizer 2 molded of resin exposed on the front side, an
annular ring diaphragm 3, a voice coil 4 connected to the ring diaphragm 3, and an annular
magnet, and the ring diaphragm The diaphragm fixing members 5 and 6 for fixing 3 and the
magnetic circuit 10 are provided.
[0027]
FIG. 2 is a perspective view for explaining the magnetic circuit 10 and the diaphragm fixing
members 5 and 6. The magnetic circuit 10 is an internal magnetic type magnetic circuit
including a magnet 14 hidden behind the plate 11 and not exposed to the surface, and has an
annular magnetic air gap 13 between the plate 11 and the yoke 12 There is. Therefore, the plate
11 is located inside the cylindrical virtual space defined by the magnetic air gap 13. Moreover,
the plate 11 is provided with the positioning convex-shaped part 11p which the inner peripheral
end of the inner periphery fixed magnet 5 which is a diaphragm fixing member fits. The
positioning convex portion 11 p may be a cylindrical convex portion protruding from the central
portion of the plate 11. As a result, a DC magnetic field is formed in the magnetic gap 13 of the
magnetic circuit 10, and the voice coil 4 connected to the ring diaphragm 3 is disposed when the
ring speaker 1 is assembled as described later. The plate 11, the yoke 12, and the magnet 14 are
connected and fixed by an adhesive.
[0028]
The diaphragm fixing members 5 and 6 are two magnetized ring-shaped magnets, respectively,
and are connected and fixed to the plate 11 and the yoke 12 of the magnetic circuit 10 with an
adhesive, respectively. That is, one of the diaphragm fixing members is the inner peripheral fixed
magnet 5, and the other of the diaphragm fixing members is the outer peripheral fixed magnet 6.
As described later, when the ring type speaker 1 is assembled, the inner peripheral fixed magnet
5 and the outer peripheral fixed magnet 6 fix the inner peripheral end and the outer peripheral
end of the ring diaphragm 3 with magnetic force. The inner fixed magnet 5 and the outer fixed
magnet 6 are magnetized so as to form a repulsive magnetic field in the magnetic gap 13
together with the magnet 14. In the case of the present embodiment, the magnet 14 and the
inner fixed magnet 5 are attached such that the same magnetic poles are close to each other with
the plate 11 of the magnetic circuit 10 interposed therebetween. Further, the outer
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10
circumferential fixed magnet 6 is magnetized and attached such that the side closer to the
magnetic gap 13 is the opposite magnetic pole.
[0029]
FIG. 3 is a diagram for explaining the process of connecting the ring diaphragm 3 and the voice
coil 4. The ring diaphragm 3 is defined between the inner peripheral end 3a having a flat shape,
the outer peripheral end 3b having a flat shape, and the inner peripheral end 3a and the outer
peripheral end 3b, and is vibratably supported. A circular hole 3d is formed at the center of the
inner peripheral end 3a. Further, the voice coil 4 has a bobbin 4a formed in a cylindrical shape,
and a coil 4b wound around the bobbin 4a. In the case of the present embodiment, the ring
diaphragm 3 and the voice coil 4 are fixed in relative positions using the bonding jigs Ja and Jb,
and are connected and fixed in advance with an adhesive. Specifically, one end of the bobbin 4a
is connected and fixed by an adhesive in the vicinity of the center of the vibrating portion 3c
defined by two rolls connected in the cross-sectional shape. The ring diaphragm 3 is a diaphragm
using, for example, a woven fabric of synthetic fibers coated with a resin such as acryl or
urethane as a base material.
[0030]
FIG. 4 is a view for explaining the equalizer 2, FIG. 4 (a) is a perspective view seen from the back
side, and FIG. 4 (b) is an enlarged cross-sectional view for explaining the main part. For example,
the resin forming the equalizer 2 is an ABS resin excellent in moldability, and the equalizer 2 has
an inner peripheral portion 21 having a convex external shape on the front side to form a shelllike equalizer, and an annular equalizer. An outer peripheral portion 22 to be formed and a
connecting arm portion 23 integrally connecting these are formed integrally by resin molding,
and as a result, the radiation hole 20 is formed. Specifically, the connecting arm portion 23 is a
radially extending four plate-like connecting arm that integrally connects the inner
circumferential portion 21 and the outer circumferential portion 22. In addition to the screw
mounting hole of the ring-type speaker 1, a connecting portion 24 in which a claw that is
connected to the magnetic circuit 10 protrudes is extended in the outer peripheral portion 22 of
the equalizer 2. In the case where the ring-type speaker 1 is assembled, when a current is applied
to the coil 4b of the voice coil 4, the ring diaphragm 3 exposed from the radiation hole 20
vibrates and a sound wave is emitted. The equalizer 2 improves acoustic characteristics such as
reproduction frequency characteristics and works to suppress unnecessary vibration and
abnormal noise, like the connected equalizer of the ring type speaker of Patent Document 2
described above.
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[0031]
The equalizer 2 molded by resin is insert-molded on the inner peripheral portion 21 of the inner
peripheral plate 25 made of an annular magnetic body, and on the outer peripheral portion 22 of
the outer peripheral plate 26 made of an annular magnetic body. It is done. The inner
circumferential plate 25 and the outer circumferential plate 26 may be made of, for example, a
magnetic material containing iron equivalent to the plate 11 or the like constituting the magnetic
circuit 10. As will be described later, the inner circumferential plate 25 and the outer
circumferential plate 26 fix the ring diaphragm 3 together with the diaphragm fixing members 5
and 6 by magnetic force. In the present embodiment, the inner circumferential plate 25 and the
outer circumferential plate 26 are insert-molded so that the flat portion is exposed on the back
side of the equalizer 2, but if they are disposed close to the radiation hole 20, It does not
necessarily have to be exposed. The equalizer 2 insert-molds the inner circumferential plate 25
and the outer circumferential plate 26 made of a magnetic material such as iron in the critical
dimension portions in contact with the magnetic circuit 10 and the ring diaphragm 3 to disperse
molding conditions or variations in manufacturing lots. It becomes difficult to cause dimensional
expansion and contraction due to changes over time and the like. Therefore, the ring type
speaker 1 including the equalizer 2 can obtain stable performance when assembled.
[0032]
FIG. 5 is a cross-sectional view for explaining the ring-type speaker 1 of the present embodiment,
and is an enlarged view in which the left half is omitted from the symmetrical central axis. The
method of manufacturing ring type speaker 1 comprises the steps of connecting and fixing
magnetic circuit 10 and diaphragm fixing members 5 and 6 in advance, connecting ring
diaphragm 3 and voice coil 4 in advance, and inner circumferential plate The steps of preforming
the equalizer 2 in which the insert molding of the outer plate 26 and the outer peripheral plate
26 is performed are included, and the steps of assembling these parts are included. Therefore,
the ring diaphragm 3 of the ring-type speaker 1 is formed between the insert-molded inner and
outer peripheral plates 25 and 26 of the equalizer 2 and the inner and outer peripheral fixed
magnets 5 and 6 which are diaphragm fixing members. It is pinched and fixed by magnetic force.
[0033]
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That is, in the ring-type speaker 1 of the present embodiment, since the inner fixed magnet 5 and
the outer fixed magnet 6 connected to the magnetic circuit 10 are magnetized in advance and
have a magnetic force, the insert molding of the equalizer 2 is performed. The inner and outer
peripheral plates 25 and 26 which are the magnetic members are attracted by the magnetic
force, and as a result, the inner peripheral end 3a and the outer peripheral end 3b which are
fixed parts of the ring diaphragm 3 are held therebetween Thus, the ring diaphragm 3 can be
fixed without any gap. That is, the inner peripheral end 3 a of the ring diaphragm 3 is
sandwiched between the upper surface of the inner peripheral fixed magnet 5 and the inner
peripheral plate 25 of the equalizer 2. The outer peripheral end 3 b of the ring diaphragm 3 is
sandwiched between the upper surface of the outer peripheral fixed magnet 6 and the outer
peripheral plate 26 of the equalizer 2. Therefore, when fixing the ring diaphragm 3, it is not
necessary to use an adhesive, and the adhesive does not stick out and solidify in the inner
peripheral end 3a and the outer peripheral end 3b, and the number of steps required for drying
the adhesive is also reduced. It can be reduced.
[0034]
Since the resin-molded equalizer 2 has the inner peripheral portion 21 and the outer peripheral
portion 22 connected by the four connecting arm portions 23, if the equalizer 2 is connected to
the magnetic circuit 10 when assembling the ring type speaker 1, the ring The diaphragm 3 can
be fixed by the magnetic force of the inner fixed magnet 5 and the outer fixed magnet 6, and the
voice coil 4 can be disposed in the magnetic gap 13 of the magnetic circuit 10. Therefore, the
number of parts and the number of steps of the ring-type speaker 1 can be reduced as compared
with the prior art. Further, by providing the diaphragm fixing members 5 and 6, the equalizer 2
and the magnetic circuit 10 are strongly connected, so unnecessary vibration is suppressed,
abnormal noise is generated due to the vibration, or the sound quality is deteriorated. Can be
reduced, and acoustic characteristics can be improved.
[0035]
In the plate 11 of the magnetic circuit 10, a positioning convex portion 11p is formed in which
the inner peripheral end of the inner peripheral fixed magnet 5, which is a diaphragm fixing
member, is fitted. The positioning convex portion 11 p is also fitted with the circular hole 3 d
formed in the inner peripheral end 3 a of the ring diaphragm 3 and the inner peripheral plate 25
insert-molded in the inner peripheral portion 21 of the equalizer 2. That is, since the voice coil 4
is connected and fixed to the ring diaphragm 3 in advance, when the circular hole 3d formed in
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the inner peripheral end 3a of the ring diaphragm 3 is fitted to the positioning convex portion
11p, the voice is A coil 4 is arranged in the magnetic air gap 13 of the magnetic circuit 10.
Further, the position at which the magnetic circuit 10 is connected and attached is restricted by
the inner peripheral plate 25 and the connecting portion 24 of the equalizer 2. Therefore, the
positioning convex portion 11 p regulates the fixing position of the ring diaphragm 3 and the
equalizer 2 in the manufacturing process of the ring-type speaker 1 and eliminates the assembly
jig, thereby facilitating the assembly and reducing the number of man-hours. It can be realized.
[0036]
FIG. 6 is a cross-sectional view for explaining a conventional ring-type speaker 101 as a
comparative example, and is an enlarged view in which the left half is omitted from the
symmetrical central axis as in FIG. The ring-type speaker 101 of the comparative example is a
comparative example in which the method of fixing the ring diaphragm 3 to the ring-type
speaker 1 of the present embodiment is changed to a method of fixing using a conventional
adhesive. Instead of including the equalizer 2 in which the plate 26 is insert-molded and the
inner peripheral fixed magnet 5 and the outer peripheral fixed magnet 6 as diaphragm fixing
members, the resin molded equalizer 102 and the positioning convex portion are respectively
And a magnetic circuit 100 including the plate 111 which is not included. That is, the inner
peripheral end 3a of the ring diaphragm 3 is adhesively fixed to the plane on the back side of the
inner peripheral portion 121 of the equalizer 102 with an adhesive, and the outer peripheral end
3b of the ring diaphragm 3 is the outer peripheral part of the equalizer 102 It is adhesively fixed
to the plane on the back side of the substrate 122 with an adhesive, and is not in direct contact
with the magnetic circuit 100, and has a gap.
[0037]
FIG. 7 is a graph showing the on-axis 1 m sound pressure frequency characteristics of the ring
speaker. FIG. 7A shows the case of the ring type speaker 1 of the present embodiment, and FIG.
7B shows the case of the ring type speaker 101 of the comparative example. In the case of the
ring-type speaker 1 of this embodiment, no peak dip occurs in the reproduction band above
10000 Hz up to the peak of the high frequency limit frequency fh above about 60000 Hz, and
flat frequency characteristics are obtained. It shows. On the other hand, in the case of the ring
type speaker 101 of the comparative example, a remarkable peak dip occurs in a band of about
15000 Hz to about 80000 Hz, and it can be seen that the ring diaphragm 3 is divided and
vibrated. That is, as in the ring type speaker 1 of the present embodiment, the magnetic force
acting between the equalizer 2, the inner fixed magnet 5 and the outer fixed magnet 6 between
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the inner peripheral end 3 a and the outer peripheral end 3 b of the ring diaphragm 3 By
sandwiching and firmly fixing without gaps, unnecessary division vibration in the high region of
the ring diaphragm 3 can be suppressed, and a relatively flat sound pressure frequency
characteristic can be obtained. This is because the portion to be fixed of the ring diaphragm 3
and the vibrating portion 3c which is the portion capable of vibrating are clearly distinguished,
and as a result, the high limit frequency fh at which the divided vibration occurs is raised. It is. As
described above, in the ring-type speaker 1 of the present embodiment, the reproduction
frequency band can be widened, and the acoustic characteristics can be improved.
[0038]
Further, the DC magnetic field in the magnetic gap 13 of the magnetic circuit 10 of the ring
speaker 1 of the present embodiment has a stronger magnetic field strength than the DC
magnetic field in the magnetic gap 113 of the magnetic circuit 100 of the ring speaker 101 of
the comparative example. . That is, in the case of the ring-type speaker 1 of the present
embodiment, the inner fixed magnet 5 and the outer fixed magnet 6 work together with the
magnet 14 to form a repulsive magnetic field in the magnetic gap 13. The density distribution
shows higher values than in the comparative example. In the case of the ring speaker 101 of the
comparative example, while the maximum value of the magnetic flux density in the magnetic air
gap 113 is about 1.44 [T], in the case of the ring speaker 1 of this embodiment, The maximum
value of the magnetic flux density at the magnetic air gap 13 is about 1.50 [T], which is increased
by about 4%. Therefore, in the ring-type speaker 1 of the present embodiment, the efficiency can
be improved and the reproduction sound pressure level can be improved.
[0039]
In the ring type speaker 1 of the present invention, the case where the resin forming the
equalizer 2 is an ABS resin is shown, but if the inner peripheral plate 25 and the outer peripheral
plate 26 can be insert-molded, other ones can be used. It may be a thermoplastic synthetic resin,
for example, a resin such as PS, PP, PET, PPE, PA, PC and the like. Also, although the case where
there are four connecting arm portions 23 of the equalizer 2 has been described, the connecting
arm portion 23 of the present invention is extended in the radial direction connecting the inner
peripheral portion and the outer peripheral portion of the equalizer integrally. If it is
[0040]
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FIG. 8 is a view for explaining a magnetic circuit and a diaphragm fixing member used for a ring
type speaker 1B (not shown) which is another preferred embodiment of the present invention.
That is, in the case of the present embodiment, the inner fixed magnet 5 and the outer fixed
magnet 6 of the previous embodiment are further provided with the nonmagnetic rings 7 and 3
covering a part of the surface as the diaphragm fixing member. . In the case of FIG. 8A, nonmagnetic rings 7A and 8A having a substantially L-shaped cross section covering a part of the
inner fixed magnet 5 and the outer fixed magnet 6 are further provided. Further, in the case of
FIG. 8 (b), non-magnetic rings 7B and 8B having a substantially U-shaped cross section covering
a part of the inner fixed magnet 5 and the outer fixed magnet 6 are further provided. In addition,
since the ring type speaker 1B of a present Example is common in the point provided with the
equalizer 2, the ring diaphragm 3, and the voice coil 4 shown by the previous Example,
illustration and description are abbreviate | omitted.
[0041]
The inner peripheral fixed magnet 5 and the outer peripheral fixed magnet 6, which are
diaphragm fixing members, exert a magnetic force between the inner peripheral plate 25 and the
equalizer 2 in which the outer peripheral plate 26 is insert-molded, and the inner peripheral end
of the ring diaphragm 3 The portion 3a and the outer peripheral end 3b are tightly held without
any gap. As shown in FIGS. 8A and 8B, the upper surface side of the inner fixed magnet 5 and the
outer fixed magnet 6 in contact with the equalizer 2 is not covered with the nonmagnetic rings 7
and 8, and It is exposed as in the case of the embodiment of FIG. Therefore, also in the ring-type
speaker 1B of the present embodiment, the portion to which the ring diaphragm 3 is to be fixed
and the vibrating portion 3c which is the portion capable of vibrating are clearly distinguished,
and as a result, the acoustic characteristics are improved. be able to.
[0042]
The magnetic circuit 10 and the inner fixed magnet 5 and the outer fixed magnet 6 shown in FIG.
8 (a) or 8 (b) are nonmagnetic in which alternating magnetic flux caused by the audio signal
current supplied to the voice coil 4 crosses. Since the body ring is provided, an eddy current is
generated on the surface of the nonmagnetic ring, and the AC magnetic flux passing through the
inner fixed magnet 5 and the outer fixed magnet 6 which are magnets as ferromagnetic members
having hysteresis characteristics is reduced. Further, by further including these nonmagnetic
rings, the AC magnetic flux passing through the magnetic material having hysteresis
characteristics such as the plate 11, the pole 12 and the magnet 14 which constitute the
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magnetic circuit 10 is also reduced. Therefore, the ring-type speaker of the present embodiment
can realize a ring-type speaker in which the current distortion is reduced and the distortion
characteristic is excellent and the acoustic characteristic is further improved.
[0043]
The shapes of the nonmagnetic rings 7 and 8 covering a part of the surfaces of the inner fixed
magnet 5 and the outer fixed magnet 6 are not limited to the cases of 7A, 7B, 8A and 8B
described above. The nonmagnetic rings 7 and 8 may cover the upper surface side in contact
with the equalizer 2. In the present embodiment, the nonmagnetic ring is a copper ring made of
an alloy containing copper, but it may be another nonmagnetic material or an aluminum ring.
[0044]
FIG. 9 is a view for explaining the equalizer 9 used in the ring type speaker 1C according to
another preferred embodiment of the present invention, and is a perspective view of the
equalizer 9 molded of resin as viewed from the back side. Like the equalizer 2 described in the
previous embodiment, the equalizer 9 according to the present embodiment forms an annular
equalizer and an inner peripheral portion 91 having a convex external shape on the front side to
form a shell-like equalizer. An outer peripheral portion 92 and a connecting arm portion 93
integrally connecting these are integrally molded with ABS resin, and as a result, a radiation hole
90 is formed, and from the outer peripheral portion 92 to the connecting portion 94 Are
extended. Like the equalizer 2 of the previous embodiment, the equalizer 9 improves acoustic
characteristics such as reproduction frequency characteristics and acts to suppress unnecessary
vibration and noise.
[0045]
As with the equalizer 2 described in the previous embodiment, the equalizer 9 molded with resin
has an inner circumferential plate 91 formed of an annular magnetic material on its inner
circumferential portion 91 and an annular ring formed on the outer circumferential portion 92
thereof. The outer peripheral plate 96 made of a magnetic material is insert-molded. The inner
circumferential plate 95 and the outer circumferential plate 96 may be, for example, magnetic
materials containing iron. Therefore, in the ring type speaker 1C of the present embodiment, the
inner circumferential plate 95 and the outer circumferential plate 96 fix the ring diaphragm 3
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together with the diaphragm fixing members 5 and 6 with a magnetic force.
[0046]
The equalizer 9 of the present embodiment is provided with a positioning convex portion 9p
which is a cylindrical shaft protruding from the inner peripheral portion 91 in the back direction.
The positioning convex portion 9p may have a cylindrical member fixed to the back side of the
inner circumferential portion 91, but preferably includes the inner circumferential plate 95 from
the inner circumferential portion 91 forming a shell-like equalizer. It is good to form integrally.
As described later, the positioning convex portion 9p is fitted with the circular hole 3d of the
inner peripheral end 3a of the ring diaphragm 3 and the inner peripheral end of the inner
peripheral fixed magnet 5 which is a diaphragm fixing member. Therefore, the positioning
convex portion 9p regulates the fixing position of the ring diaphragm 3 and the inner peripheral
fixed magnet 5, and as a result, no assembly jig is required in the manufacturing process of the
ring type speaker 1C. In the previous embodiment, the ring diaphragm 3 and the voice coil 4
were connected and fixed in advance with an adhesive using the bonding jigs Ja and Jb, but in
the ring type speaker 1C of this embodiment, the equalizer 9 The positioning projection 9p can
be assembled in fewer steps than in the previous embodiment.
[0047]
FIG. 10 is a diagram for explaining a manufacturing process of connecting the ring diaphragm 3
and the voice coil 4 and assembling the ring type speaker 1C. As shown in FIG. 10, the ring
diaphragm 3 is inserted from the back side of the equalizer 9 having the positioning convex
portion 9p so that the circular hole 3d of the inner peripheral end 3a is fitted to the positioning
convex portion 9p. . The inner peripheral end 3a of the ring diaphragm 3 is placed on the inner
peripheral plate 95 of the equalizer 9, and the outer peripheral end 3b of the ring diaphragm 3 is
mounted on the outer peripheral plate 96 of the equalizer 9. As a result, the ring diaphragm The
three vibration parts 3 c are exposed from the radiation hole 90. Next, the inner peripheral end
of the inner peripheral fixed magnet 5 is fitted to the positioning convex portion 9 p of the
equalizer 9, and the inner peripheral fixed magnet 5 magnetized in advance on the inner
peripheral end 3 a of the ring diaphragm 3 is Place it. Since a magnetic force acts between the
inner peripheral plate 95 of the equalizer 9 and the inner peripheral fixed magnet 5, the inner
peripheral end 3 a of the ring diaphragm 3 is firmly fixed to the equalizer 9 without a gap.
Similarly, the outer peripheral end of the outer peripheral fixed magnet 6 is fitted to the
connecting portion 94 of the equalizer 9, and the outer peripheral fixed magnet 6 magnetized in
advance is placed on the outer peripheral end 3 b of the ring diaphragm 3. Since a magnetic
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force acts between the outer peripheral plate 96 of the equalizer 9 and the outer peripheral fixed
magnet 6, the outer peripheral end 3b of the ring diaphragm 3 is also fixed firmly to the
equalizer 9 without a gap. When the inner fixed magnet 5 and the outer fixed magnet 6 are
combined with a magnetic circuit 10C to be described later, the fixed magnet 5 and the outer
fixed magnet 6 are mounted after confirming the magnetization direction so as to form a
repulsive magnetic field in the magnetic gap 13C.
[0048]
Next, a predetermined amount of adhesive is applied to the vibrating portion 3 c of the ring
diaphragm 3, and the voice coil 4 is connected and fixed with the adhesive using the holding jig
Jc that holds the voice coil 4. The voice coil 4 was inserted into a holding jig Jc having an inner
diameter portion fitted to the positioning convex portion 9p of the equalizer 9, and the holding
jig Jc was fitted to the positioning convex portion 9p to solidify the adhesive. If the holding jig Jc
is removed at the stage, the ring diaphragm 3 and the voice coil 4 are connected, and further
fixed to the equalizer 9 by the inner peripheral fixed magnet 5 and the outer peripheral fixed
magnet 6 which are diaphragm fixing members. A vibration system is configured. Therefore, if
the magnetic circuit 10C having a fitting hole to be fitted to the positioning convex portion 9p of
the equalizer 9 thereafter is placed from the back side and fixed to the equalizer 9 with an
adhesive or the like, the present embodiment can be realized. An example ring speaker 1C can be
assembled.
[0049]
FIG. 11 is a cross-sectional view for explaining the ring-type speaker 1C of this embodiment, and
is an enlarged view in which the left half is omitted from the symmetrical central axis. The
manufacturing method of the ring type speaker 1C is as described above, and the positioning
convex portion 9p of the equalizer 9 and the fitting hole of the magnetic circuit 10C are fitted,
and the connecting portion 94 of the equalizer 9 and the magnetic circuit 10C. The ring-shaped
speaker 1C is configured by fitting with the outer diameter portion of the ring-shaped speaker
1C. The magnetic circuit 10C is composed of a plate 11C, a yoke 12C, and a magnet 14C, which
each have a fitting hole at the center. Further, the ring diaphragm 3 of the ring-type speaker 1C
of this embodiment is, as in the case of the previous embodiment, an inner peripheral plate 95
and an outer peripheral plate 96 on which the equalizer 9 is insert-molded, and a diaphragm
fixing member. It is pinched and fixed between the inner fixed magnet 5 and the outer fixed
magnet 6 by magnetic force.
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[0050]
In the ring type speaker 1C of this embodiment, it is not necessary to use an adhesive when
fixing the ring diaphragm 3, and the adhesive does not stick out and solidify in the inner
peripheral end 3a and the outer peripheral end 3b. The characteristics can be improved. Also, the
use of jigs necessary for assembly can be further reduced to facilitate assembly, and the number
of assembly steps and manufacturing costs can be reduced. That is, in the bonding method of the
ring diaphragm 3 and the voice coil 4 in the previous embodiment described in FIG. 3, when
applying the adhesive to the ring diaphragm 3, the ring diaphragm 3 is shifted or rotated.
Although there is a possibility, in the case of this embodiment, the inner peripheral end 3a and
the outer peripheral end 3b of the ring diaphragm 3 are divided into an inner peripheral plate 95
and an outer peripheral plate 96, an inner fixed magnet 5 and an outer fixed magnet 6 Since the
ring diaphragm 3 is sandwiched, the displacement and rotation of the ring diaphragm 3 can be
suppressed and bonding can be performed stably. Moreover, since it assembles only by said
holding jig Jc, there exists an advantage which can improve manufacturing efficiency including
the point which reduces jig | tool cost.
[0051]
FIG. 12 is a view for explaining a ring type speaker 1D which is another preferred embodiment of
the present invention, and is an enlarged view in which the left half is omitted from the
symmetrical central axis. While the magnetic circuit 10 constituting the ring type speaker 1 of
the previous embodiment is an internal magnetic type magnetic circuit, the ring type speaker 1D
of the present embodiment has an external magnetic type magnetic circuit 10D constituting the
same. It differs in that it is a circuit. Therefore, the description of the common equalizer 2, the
ring diaphragm 3 and the voice coil 4 is omitted.
[0052]
The external magnetic type magnetic circuit 10D used for the ring type speaker 1D of this
embodiment includes a plate 11D, a pole 12D, and a magnet 14D, and the plate 11D and the pole
12D define a circumferential magnetic air gap 13D. doing. Since the magnetic circuit 10D is an
external magnet type magnetic circuit, the plate 11D and the magnet 14D are positioned outside
the cylindrical space defined by the magnetic gap 13D, and the pole 12D is positioned inside the
cylindrical space defined by the magnetic gap 13D. Is located. The pole 12 D is formed by the
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circular hole 3 d of the inner peripheral end 3 a of the ring diaphragm 3, the inner peripheral
end of the inner peripheral fixed magnet 5 which is a diaphragm fixing member, and the inner
peripheral plate 25 of the equalizer 2. The inner peripheral end is provided with a positioning
convex part 12p fitted. Therefore, in the manufacturing process of the ring-type speaker 1D, the
positioning convex portion 12p regulates the fixing position of the ring diaphragm 3 and the
equalizer 2 as in the previous embodiment, and the assembly jig is not necessary. It is possible to
realize the ease of assembly and the reduction of the number of steps.
[0053]
Further, the inner fixed magnet 5 and the outer fixed magnet 6, which are diaphragm fixing
members, form a repulsive magnetic field in the magnetic gap 13D of the magnetic circuit 10D of
the ring type speaker 1D of this embodiment. The outer circumferential fixed magnet 6 is
attached so that the same magnetic pole is in close proximity to the magnet 14D of the outer
magnetic type magnetic circuit 10D with the plate 11D in between, and the inner circumferential
fixed magnet 5 also has the same side closer to the magnetic gap 13D. It is magnetized and
attached so that it becomes the magnetic pole of. Therefore, the direct-current magnetic field in
the magnetic air gap 13D is stronger than that in the case where only the magnet 14D of the
external magnetic type magnetic circuit 10D is used. In the ring-type speaker 1 of the present
embodiment, the efficiency can be improved to improve the reproduction sound pressure level.
[0054]
In the above-described ring-type speaker of the present invention, although the inner peripheral
plate and the outer peripheral plate which are insert-molded to the equalizer molded by resin are
made of magnetic materials such as iron, they are ferromagnetic materials such as magnets It
may be replaced by Thus, when the inner peripheral plate and the outer peripheral plate are
magnets having a magnetic force, the magnetism of the magnet of the inner peripheral plate of
the equalizer and the inner peripheral fixed magnet sandwiching the inner peripheral end 3a of
the ring diaphragm 3 Each of them may be different, and may be attracted by magnetic force.
Further, the magnetism of the magnet of the outer peripheral plate of the equalizer for holding
the outer peripheral end 3b of the ring diaphragm 3 and the outer peripheral fixed magnet may
be made different from each other so as to attract each other by the magnetic force.
[0055]
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The ring-type speaker of the present invention is not limited to the tweeter for high-range
reproduction, and can also be applied to a full range speaker and other speakers for middle-low
range reproduction. A shell-shaped equalizer is disposed on the inner circumferential side of the
ring diaphragm, and an annular equalizer is disposed on the outer circumferential side of the ring
diaphragm, which is suitable for a speaker provided with a connecting arm.
[0056]
It is a figure explaining ring type speaker 1 by a desirable embodiment of the present invention.
(Example 1) FIG. 5 is a perspective view for explaining the magnetic circuit 10 and the
diaphragm fixing members 5 and 6 of the ring type speaker 1 according to a preferred
embodiment of the present invention. (Example 1) A diagram for explaining a process of
connecting the ring diaphragm 3 of the ring type speaker and the voice coil 4 according to a
preferred embodiment of the present invention. (Examples 1 and 2) A diagram for explaining an
equalizer 2 of a ring speaker according to a preferred embodiment of the present invention.
(Example 1, 2, 4) It is sectional drawing explaining the ring-type speaker 1 of an Example.
(Example 1) It is a cross-sectional view for explaining a conventional ring-type speaker 101.
(Comparative example) It is a graph showing the on-axis 1 m sound pressure frequency
characteristic of the ring speaker of the present invention and the prior art. (Example 1,
Comparative Example) FIG. 8 is a view for explaining a magnetic circuit and a diaphragm fixing
member used for a ring type speaker 1B according to another preferred embodiment of the
present invention. (Example 2) FIG. 6 is a view for explaining an equalizer 9 used for a ring type
speaker 1C according to another preferred embodiment of the present invention. (Example 3) A
manufacturing process for assembling a ring-type speaker 1C according to another preferred
embodiment of the present invention will be described. (Example 3) FIG. 7 is a cross-sectional
view for explaining a ring-type speaker 1C according to another preferred embodiment of the
present invention. (Example 3) FIG. 10 is a cross-sectional view for explaining a ring-type speaker
1D according to another preferred embodiment of the present invention. (Example 4)
Explanation of sign
[0057]
Reference Signs List 1 ring type speaker 2, 9 equalizer 3 ring diaphragm 4 voice coil 5 inner
circumferential fixed magnet 6 outer circumferential fixed magnet 7, 8 nonmagnetic ring 10,
10C, 10D magnetic circuit 11 plate 12 yoke, pole 13 magnetic air gap 14 magnet 20 Radiation
hole 21 inner circumferential portion 22 outer circumferential portion 23 connecting arm
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portion 24 connecting portion 25 inner circumferential plate 26 outer circumferential plate
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