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DESCRIPTION JP2007288641

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DESCRIPTION JP2007288641
A ribbon type speaker device capable of preventing deformation of a diaphragm and improving
directivity characteristics and sound pressure characteristics in a high frequency range. A
speaker device of ribbon type comprises a magnetic circuit having two magnetic gaps, and two
diaphragms which are conductive and arranged substantially parallel and opposite to each other
in each of the magnetic gaps. And a drive unit for supplying a drive current to each of the
diaphragms, wherein the direction of the magnetic flux generated in each of the magnetic gaps
and the traveling direction of the drive current supplied to each of the diaphragms are the same
for each of the diaphragms. The directions of movement are set, and each of the diaphragms
inclines in the direction approaching each other. Thus, the shape formed by connecting each of
the diaphragms has a substantially V-shaped shape. Therefore, it is possible to radiate a super
high frequency sound over a wide range while improving the strength of each of the diaphragms.
As a result, it is possible to prevent deformation of the diaphragm and to improve directivity
characteristics and sound pressure characteristics in the high region. [Selected figure] Figure 1
Speaker device
[0001]
The present invention relates to improvement of sound pressure characteristics and the like in a
ribbon type speaker device.
[0002]
Conventionally, as a speaker device for reproducing a very high frequency band, a ribbon type
speaker device capable of reproducing sound to a very high frequency band of about 100 KHz is
known.
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[0003]
This ribbon type speaker device mainly includes a yoke, a pair of magnets disposed to face each
other on the yoke, and a magnetic circuit having a pair of plates disposed at positions
corresponding to each of the pair of magnets. And one ribbon diaphragm formed of a material
having a ribbon shape and having conductivity.
And in this ribbon type speaker device, one magnetic gap is formed between a pair of plates, and
a ribbon type diaphragm is arranged in the magnetic gap.
Further, both ends of the ribbon diaphragm are connected to the secondary transformer of the
matching transformer (impedance conversion transformer) through the plus / minus lead wires,
and the primary transformer of the matching transformer is a driving power supply. It is
connected to the.
[0004]
In the ribbon type speaker device having the above configuration, impedance conversion is
performed such that the drive current supplied from the drive power supply becomes a
predetermined drive current by the matching transformer, and the predetermined drive current
is supplied to the ribbon diaphragm. Be done. As a result, the ribbon diaphragm vibrates based
on Fleming's left-hand rule, and ultra-high frequency sound reproduction is performed.
[0005]
For example, Patent Documents 1 and 2 describe ribbon-type speaker devices having this type of
configuration.
[0006]
In the ribbon-type speaker device described in Patent Document 1, a ribbon-shaped diaphragm is
disposed in a magnetic gap formed between a pair of pole pieces in parallel with the top surface
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of the magnetic yoke.
Further, in the ribbon-type electroacoustic transducer described in Patent Document 2, a
magnetic gap is formed between a pair of magnets, a ribbon-shaped diaphragm is disposed in the
magnetic gap, and a conductive plate is ribbon-shaped. It is arranged to surround the diaphragm.
The ribbon-shaped diaphragm is disposed on substantially the same plane as the conductive
plate.
[0007]
A leaf type speaker device having an equalizer (phase equalizer) having a function of flattening
high frequency characteristics is known (see, for example, Patent Document 3). In this leaf type
speaker device, a magnetic circuit is attached on a frame having a U-shaped cross section. The
magnetic circuit has an outer yoke having a U-shaped cross section, a magnet disposed at the
center of the outer yoke, and a plate disposed on the magnet. The diaphragm is disposed such
that a pattern coil is present on the upper surface side of the magnetic gap, and an equalizer
having a triangular cross section is disposed on the frame of the diaphragm. The top of the
equalizer is located above the top of the frame.
[0008]
Patent Document 1: Japanese Patent Application Laid-Open No. 10-178699 Utility model
registration No. 3023579 Japanese Patent Application Laid-Open No. 2003-169393
[0009]
However, in Patent Document 1 described above, the ribbon diaphragm is disposed in the
magnetic gap formed between the pair of pole pieces in parallel with the upper surface of the
magnetic yoke, and in Patent Document 2 described above. Because the ribbon-shaped
diaphragm is disposed on substantially the same plane as the conductive plate in the magnetic
gap, the mechanical impedance of the ribbon-shaped diaphragm becomes uneven during highfrequency reproduction due to such a structure. There is a problem that the ribbon-shaped
diaphragm is deformed.
Moreover, in the patent documents 1 and 2 mentioned above, the directivity characteristic in a
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high region becomes bad on the structure, and there exists a problem that the sound wave of a
super high region can not be radiated over a wide range.
[0010]
Further, in Patent Document 3 described above, since the top of the equalizer is located above
the upper end of the frame, there is a problem that it is difficult to realize thinning of the speaker
device.
[0011]
As problems to be solved by the present invention, the above-mentioned ones can be mentioned
as an example.
An object of the present invention is to provide a ribbon type speaker device capable of
preventing deformation of a diaphragm and improving directivity and sound pressure
characteristics in a high frequency range.
[0012]
The invention according to claim 1 is a speaker device, which is conductive and has a magnetic
circuit having at least two magnetic gaps, and is disposed substantially in parallel and opposite to
each other in each of the magnetic gaps. At least two diaphragms and a drive unit for supplying a
drive current to each of the diaphragms, and the direction of the magnetic flux generated in each
of the magnetic gaps and the progression of the drive current supplied to each of the diaphragms
The directions are set such that each of the diaphragms moves in the same direction, and each of
the diaphragms is inclined toward the mutually approaching direction.
[0013]
In one embodiment of the present invention, the speaker device is a so-called ribbon type
speaker device, has conductivity with a magnetic circuit having at least two magnetic gaps, and is
approximately parallel in each of the magnetic gaps and At least two diaphragms arranged to
face each other, and a drive unit for supplying a drive current to each of the diaphragms, the
direction of the magnetic flux generated in each of the magnetic gaps and the supply to each of
the diaphragms The traveling direction of the drive current to be driven is set to a direction in
which each of the diaphragms moves in the same direction, and each of the diaphragms inclines
in a direction approaching each other.
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[0014]
The above speaker device comprises: a magnetic circuit having at least two magnetic gaps; at
least two diaphragms having conductivity and disposed substantially in parallel and opposite to
each other in each of the magnetic gaps; And a driving unit for supplying a driving current to
each of the plurality of units.
Further, the direction of the magnetic flux generated in each of the magnetic gaps and the
traveling direction of the drive current supplied to each of the diaphragms are set in the direction
in which each of the diaphragms moves in the same direction.
In a preferred example, when the direction of the magnetic flux generated in each of the
magnetic gaps is set to be relatively reverse, the traveling direction of the drive current supplied
to each of the diaphragms is relatively relative to each of the diaphragms. It is preferable to set in
the reverse direction.
[0015]
In particular, since each of the diaphragms inclines in the direction approaching each other, the
following effects can be obtained.
[0016]
That is, in the speaker device having such a configuration, each of the diaphragms is
substantially orthogonal to the direction of the magnetic flux generated in each of the
corresponding magnetic gaps before each divided vibration of the diaphragms is started in the
low band. In the vibration direction, each of the diaphragms inclines toward each other, so that
the vibration vectors of each of the diaphragms are combined, and each of the diaphragms is at
the center of the speaker device. It vibrates in the axial direction.
Thereby, a large amount of synthesized sound waves of each of the diaphragms is emitted in the
central axis direction of the speaker device. On the other hand, in the high frequency region, the
mechanical impedance of each end of each of the diaphragms is larger than that of the center of
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each of the diaphragms. Is large. Therefore, each of the diaphragms largely vibrates in the
direction substantially orthogonal to the direction of the magnetic flux generated in the
corresponding magnetic gap in the vicinity of the central portion thereof, and the sound waves of
each of the diaphragms are directed in their respective vibration directions It is emitted more to
have characteristics. Thus, the vibration vectors of each of the diaphragms are combined, and the
combined sound waves are emitted more in the central axis direction of the speaker device. As a
result, due to its structure, this speaker device can emit ultra-high frequency sound waves over a
wide range as compared with the above comparative example.
[0017]
In addition, since each of the diaphragms inclines in the direction toward each other, each of the
diaphragms in the central axis direction of the speaker device is compared with the comparative
example in which each of the diaphragms is arranged not to incline. The strength of each of the
diaphragms can be improved, and the strength of each of the diaphragms can be improved. In
particular, in the above-described low range, each of the diaphragms after movement vibrates
while maintaining the desired shape, so that the strength of each of the diaphragms can be
further improved. Further, in the case of the high region, while vibration decreases at each end of
each of the diaphragms, each of the diaphragms moves so as to increase the vibration at its
central portion. Deformation is less likely to occur.
[0018]
Further, in this speaker device, by changing the inclination angle of each of the diaphragms, it is
possible to set the directivity in the high region to a desired directivity.
[0019]
In one aspect of the above speaker device, the magnetic circuit includes a first magnetic pole
provided substantially at a central position of the magnetic circuit, and a second magnetic pole
and a third magnetic pole provided on both sides of the first magnetic pole. The first magnetic
pole is provided below the second magnetic pole and the third magnetic pole, and the first
magnetic pole, the second magnetic pole, and the third magnetic pole are provided. And each of
the magnetic gaps is formed between them, and the direction of the magnetic flux generated in
each of the magnetic gaps is relatively set in the opposite direction, and each of the vibration
plates is made of each of the magnetic gaps. Are respectively disposed along the direction of the
magnetic flux generated in
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[0020]
In this aspect, the magnetic circuit has a first magnetic pole provided substantially at the center
of the magnetic circuit, and a second magnetic pole and a third magnetic pole provided on both
sides of the first magnetic pole, The first magnetic pole is provided below the second magnetic
pole and the third magnetic pole.
In a preferred example, the first magnetic pole is constituted by a part of a yoke, and the second
magnetic pole and the third magnetic pole are respectively constituted by a combination of a
magnet and a plate, and a part of the yoke The upper end is located below the upper end of the
plate.
Further, each of the magnetic gaps is formed between the first magnetic pole and the second
magnetic pole and the third magnetic pole, and the direction of the magnetic flux generated in
each of the magnetic gaps is relatively reverse. It is set. Also, each of the diaphragms is disposed
along the direction of the magnetic flux generated in each of the magnetic gaps. As a result, it is
possible to radiate ultra-high frequency sound waves over a wide range while improving the
strength of each of the diaphragms.
[0021]
In another aspect of the above speaker device, when each of the magnetic circuit and the
diaphragm is observed from a direction substantially orthogonal to the traveling direction of the
drive current, between the first magnetic pole and the second magnetic pole A shape formed by
connecting the magnetic flux generated in the first magnetic pole and the magnetic flux
generated between the first magnetic pole and the third magnetic pole has a substantially Vshaped shape and a shape formed by connecting each of the diaphragms Has a substantially Vshaped shape.
[0022]
In this aspect, the magnetic flux generated between the first magnetic pole and the second
magnetic pole when each of the magnetic circuit and the diaphragm is observed from a direction
substantially orthogonal to the traveling direction of the drive current supplied to each of the
diaphragms. The shape connecting the first magnetic pole and the magnetic flux generated
between the third magnetic pole has a substantially V shape, and the shape connecting each of
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the diaphragms has a substantially V shape Have.
As a result, it is possible to radiate ultra-high frequency sound waves over a wide range while
improving the strength of each of the diaphragms.
[0023]
In another aspect of the above speaker device, each of the diaphragms has a ribbon shape and a
strip shape, and the magnetic circuit has a rectangular shape. Thereby, a ribbon type speaker
device can be configured.
[0024]
In a preferred embodiment, each of the diaphragms is preferably formed of a metal foil.
Alternatively, each of the diaphragms is preferably configured to include a resin film and a
conductor formed on the surface of the resin film and supplied with the driving current.
Alternatively, each of the diaphragms is preferably formed by bending one metal foil having a
ribbon shape and a strip shape.
[0025]
In another preferred embodiment, it is preferable that one end side of each of the diaphragms
located on the first magnetic pole side be connected by a visco-elastic material. This makes it
easier to obtain low tones. Alternatively, it is preferable that one end side of each of the
diaphragms located on the first magnetic pole side be attached to the first magnetic pole via a
viscoelastic material. Here, as the visco-elastic material, it is preferable to be formed of a material
which is lightweight and has viscosity, elasticity, and adhesiveness.
[0026]
In still another preferred embodiment, it is preferable that the other end of each of the
diaphragms opposite to the first magnetic pole is formed in a wave-like cross-sectional shape. In
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addition, it is preferable that all or part of each of the diaphragms have a streak or concavoconvex shape. Preferably, each of the diaphragms is attached to the first magnetic pole via a
diaphragm mounting member that supports each of the diaphragms.
[0027]
In another aspect of the above speaker device, the phase equivalent has a function of flattening
high frequency frequencies on each of the first magnetic poles, between each of the diaphragms
located on the first magnetic pole side. A vessel is provided.
[0028]
In this aspect, a phase equalizer (equalizer or acoustic of acoustic material) having a function of
flattening high frequencies on the first magnetic pole, between each of the diaphragms located
on the first magnetic pole side. Since the diffuser or the throttling device for increasing the
acoustic load is provided, the high frequency band can be flattened and a good sound pressure
characteristic can be obtained in the high frequency band.
[0029]
In another aspect of the above speaker device, the phase equalizer has an insulating property,
and has a convex shape projecting upward between each of the diaphragms positioned on the
first magnetic pole side. A portion, each of the diaphragms being shielded from one another by
the convex portion.
[0030]
In this aspect, the phase equalizer has an insulating portion and a convex portion having a
convex shape projecting upward between each of the diaphragms located on the first magnetic
pole side.
And each of a diaphragm is mutually shielded by the convex-shaped part.
Thereby, each of the diaphragms is shielded by the insulating convex portion, and short circuit of
each of the diaphragms can be prevented.
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Further, in this aspect, on the first magnetic pole positioned below the second magnetic pole and
the third magnetic pole, a convex portion is provided so as to project upward from between each
of the diaphragms. Accordingly, the amount of protrusion of the convex portion can be reduced,
and the speaker device can be thinned. That is, a thin ribbon type speaker device can be
obtained. Moreover, since it has such a structure, the range which can change the height of a
convex-shaped part spreads, and it can correct | amend so that it may become a desired sound
pressure characteristic.
[0031]
Hereinafter, preferred embodiments of the present invention will be described with reference to
the drawings.
[0032]
[Configuration of Speaker Device] First, the configuration of a speaker device 100 according to
an embodiment of the present invention will be described with reference to FIG.
[0033]
FIG. 1A shows a perspective view of a speaker device 100 according to an embodiment of the
present invention when observed from the sound output side.
FIG. 1 (b) shows a cross-sectional view of the speaker device 100 along the cutting line A-A ′ of
FIG. 1 (a).
[0034]
The speaker device 100 is a speaker device for reproducing a very high frequency band, and
includes two magnetic circuits having a rectangular parallelepiped shape including the yoke 1,
the pair of magnets 2a and 2b, and the pair of plates 3a and 3b. The diaphragms 5a and 5b and a
drive unit 70 for driving the diaphragms 5a and 5b are provided.
[0035]
The configuration of the magnetic circuit is as follows.
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[0036]
The yoke 1 has an inverted T-shaped cross-sectional shape, a pole portion (first magnetic pole)
1b provided substantially at the center position, and supporting portions provided on both sides
thereof for supporting the pair of magnets 2a and 2b. And 1a.
The upper end of the first magnetic pole 1b, that is, the upper end 1ba of the pole portion, is set
at a height below the upper surfaces of a pair of plates 3a and 3b described later.
Each of the pair of magnets 2a and 2b has a rectangular parallelepiped shape, and is mounted on
the corresponding support portion 1a.
The magnetized states of the N pole and the S pole of the pair of magnets 2a and 2b are set to
the same state. That is, in the present embodiment, the magnetization state of the pair of magnets
2a and 2b located in the support portion 1a of the yoke 1 is set to the S pole, and located on the
side of the pair of plates 3a and 3b described later The magnetized states of the magnets 2a and
2b are set to the N pole. However, this magnetized state is an example, and in the present
invention, the magnetized states of the N pole and the S pole of the pair of magnets 2a and 2b
may, of course, be opposite to the above example. The pair of plates 3a and 3b has a rectangular
parallelepiped shape and a flat plate shape, respectively, and is mounted on the pair of magnets
2a and 2b, respectively. And while "the 2nd magnetic pole 10" is constituted by one magnet 2a
and one plate 3a, "3rd magnetic pole 11" is constituted by one magnet 2b and one plate 3b.
[0037]
In the magnetic circuit having the above configuration, a magnetic field is formed as shown by
the broken line arrow in FIG. 1 (b). Therefore, the magnetic circuit has two magnetic gaps, and a
first magnetic gap 4a is formed between the first magnetic pole 1b and the second magnetic pole
10, and the first magnetic pole 1b and A second magnetic gap 4 b is formed between the third
magnetic pole 11 and the second magnetic pole 4. The direction of the magnetic flux generated
in the first magnetic gap 4a is set in the arrow Y4 direction from the second magnetic pole 10 to
the first magnetic pole 1b, and the direction of the magnetic flux generated in the second
magnetic gap 4b is The direction of the arrow Y5 is from the third magnetic pole 11 to the first
magnetic pole 1b. Therefore, the direction of the magnetic flux generated in the first magnetic
gap 4a and the direction of the magnetic flux generated in the second magnetic gap 4b are set to
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be relatively reverse to each other.
[0038]
The two diaphragms 5a and 5b each have a ribbon shape and a strip shape, and are formed of a
conductive material having conductivity, such as metal foil. Each end of the diaphragms 5a and
5b disposed on the first magnetic pole 1b side is disposed near the upper end 1ba of the first
magnetic pole 1b and at an appropriate distance via a viscoelastic material (dumping agent) 6
The relative positional relationship between the diaphragm 5a and the diaphragm 5b is such that
the two are substantially parallel and the combination of the two has a substantially V-shaped
cross-sectional shape. It is set to. Further, each of the diaphragms 5a and 5b is disposed along
the direction of the arrow Y4 and the direction of the arrow Y5 which are the directions of the
magnetic fluxes generated in the first magnetic gap and the second magnetic gap 4b,
respectively. For this reason, each of the diaphragms 5a and 5b inclines in the direction
approaching each other. The viscoelastic material (dumping agent) is preferably made of a
material that is lightweight and has viscosity, elasticity, and adhesiveness.
[0039]
Each drive unit 70 includes a wire 17 connected to each end of each of the two diaphragms 5a
and 5b, and a power source 15 connected to the wire 17 and supplying a drive current to each of
the two diaphragms 5a and 5b. And an electric circuit having In the present embodiment, the
drive units 70 set the traveling directions of the current flowing through the diaphragm 5a and
the diaphragm 5b to be relatively reverse to each other. That is, in the present embodiment, for
example, assuming that the direction of the current flowing through the diaphragm 5a is the
direction of the arrow Y2, the current flows through the diaphragm 5b in the direction of the
arrow Y3. In the present invention, both ends of each of the two diaphragms 5a and 5b may be
connected to the drive unit 70 via a transformer (not shown).
[0040]
In the speaker device 100 described above, the drive current output from each drive unit 70 is
output to the two diaphragms 5a and 5b. Thus, based on Fleming's left-hand rule, driving forces
are generated in the first magnetic gap 4a in the diaphragm 5a and in the second magnetic gap
4b in the same and same direction. The two diaphragms 5 a and 5 b are vibrated in the direction
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of the central axis L 1 of the speaker device 100. Thus, the speaker device 100 emits the
synthesized sound wave in the direction of the arrow Y1 through the two diaphragms 5a and 5b.
[0041]
Next, the operation and effect of the present embodiment will be described in comparison with
various comparative examples.
[0042]
First, the configuration of the first comparative example will be described with reference to FIG. 2
(a), and then the configuration of the second comparative example will be described with
reference to FIG. 2 (b).
In the first and second comparative examples, the same reference numerals are attached to
elements common to the present embodiment, and the description thereof is simplified or
omitted.
[0043]
The speaker device 50 according to the first comparative example includes a flat plate-like yoke
1, a pair of magnets 2a and 2b attached to both sides on the yoke 1, and a pair of magnets
attached to the pair of magnets 2a and 2b. The magnetic circuit includes the magnetic circuit
including the plates 3a and 3b, the ribbon-shaped diaphragm 5, and the drive unit (not shown)
(corresponding to the drive unit 70). The magnetization state of the pair of magnets 2a and 2b is
the same as in this embodiment, and one magnetic gap 4 is formed between the first magnetic
pole 10 and the second magnetic pole 11. The diaphragm 5 is disposed between a pair of plates
3 a and 3 b in which one magnetic gap 4 is formed. The diaphragm 5 is connected to the drive
unit in substantially the same manner as in this embodiment, and a drive current is supplied to
the diaphragm 5. In the first comparative example having the above configuration, the drive
current output from the drive unit is supplied to the diaphragm 5, and the diaphragm 5 emits a
sound wave in the direction of arrow Y1 based on Fleming's left-hand rule.
[0044]
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On the other hand, the speaker device 51 according to the second comparative example includes
the yoke 1 having an opening on the upper surface and formed in a cylindrical shape, one
magnet 2 disposed at a central position on the yoke 1, and the magnet 2 A magnetic circuit
including a plate 7 disposed on top and having a substantially inverted T-like shape, and one
ribbon-shaped diaphragm 5a disposed between the upper end of the plate 7 and the one end 1u
of the yoke 1 And another ribbon-like diaphragm 5b disposed between the upper end of the plate
7 and the other end 1v of the yoke 1 and a drive unit (not shown) (corresponding to the drive
unit 70) Configured A first magnetic gap 4a is provided between one end 1u of the yoke 1 and
the upper end of the plate 7, and a second magnetic gap 4b is provided between the other end 1v
of the yoke 1 and the upper end of the plate 7. Each is formed. The direction of the magnetic flux
in the first magnetic gap 4a is in the direction of the arrow Y11, and the direction of the
magnetic flux in the second magnetic gap 4b is in the direction of the arrow Y12 opposite to the
direction of the arrow Y11. The pair of diaphragms 5a and 5b are connected to the drive unit as
in the present embodiment, and the pair of diaphragms 5a and 5b are configured to be supplied
with a driving current. In the second comparative example having the above configuration, the
drive current output from the drive unit is supplied to the pair of diaphragms 5a and 5b, and the
pair of diaphragms 5a and 5b are in the direction of arrow Y1 based on Fleming's left hand rule.
It emits sound waves.
[0045]
In the first comparative example having the above configuration, the magnetic flux generated in
the magnetic gap 4 is formed in a straight line as shown by the arrow Y10, and the vibrating
plate 5 is arranged in the magnetic flux extending direction in the magnetic gap 4 It is arranged
to have a linear cross-sectional shape. In the second comparative example, the shape formed by
connecting the magnetic flux generated in the first magnetic gap 4a and the magnetic flux
generated in the second magnetic gap 4b is formed in a linear shape, and further, the pair of
diaphragms 5a And 5b are arranged to have a linear cross-sectional shape in the first magnetic
gaps 4a and 4b, respectively. In the first and second comparative examples, due to such a
structure, the mechanical impedance of the diaphragm 5 or the pair of diaphragms 5a and 5b
becomes uneven at the time of high-frequency reproduction, and the diaphragm 5 or the pair of
diaphragms There is a problem that deformation occurs in 5a and 5b. Further, in the first and
second comparative examples, there is a problem that the directivity characteristic in the high
region is bad due to the structure, and the sound wave in the ultra high region can not be
radiated over a wide range.
[0046]
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On the other hand, in the present embodiment, the following configuration is adopted. First, in
the present embodiment, the speaker device 100 has a magnetic circuit having the two first
magnetic gaps 4 a and the second magnetic gaps 4 b and the conductivity, and the speaker
device 100 is conductive in the first magnetic gap 4 a and the second magnetic gap 4 a. The
diaphragms 5a and 5b are provided with two diaphragms 5a and 5b disposed substantially in
parallel and opposite each other in the magnetic gap 4b, and a drive unit 70 for driving each of
the diaphragms 5a and 5b. The drive current is supplied from the drive unit 70 to each of the
directions of the magnetic fluxes generated in the first magnetic gap 4a and the second magnetic
gap 4b, and the drive current supplied to each of the diaphragms 5a and 5b. The traveling
direction of is set such that each of the diaphragms 5a and 5b moves in the same direction, and
each of the diaphragms 5a and 5b is inclined toward the direction in which they are close to each
other.
[0047]
Specifically, in the present embodiment, the upper end 1 ba of the first magnetic pole 1 b is set to
be positioned lower than the upper end of the second magnetic pole 10 and the upper end of the
third magnetic pole 11. The first magnetic gap 4 a is formed between the first magnetic pole 1 b
and the second magnetic pole 10, and the second magnetic gap 4 b is formed between the first
magnetic pole 1 b and the third magnetic pole 11. Then, the locus of the magnetic flux generated
in each of the first magnetic gap 4a and the second magnetic gap 4b is set to be substantially Vshaped, and one diaphragm 5a is disposed in the first magnetic gap 4a. In addition, one other
diaphragm 5b is disposed in the second magnetic gap 4b. Further, the relative positional
relationship between one diaphragm 5a and the other one diaphragm 5b is such that the cross
section of the V-shaped cross section formed by the combination of both so that the both are
substantially parallel and opposed to each other. It is set to have a shape. As a result, the
directivity characteristic and the sound pressure characteristic in the high region are improved in
terms of the configuration, and the sound wave in the ultra high region can be emitted over a
wide range.
[0048]
This point will be supplementarily described below.
[0049]
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First, the operation of the diaphragms 5a and 5b in the low band will be described with reference
to FIG.
FIG. 3A is an enlarged cross-sectional view of the main part of FIG. 1B in which the vicinity of the
first magnetic pole 1b and the diaphragms 5a and 5b is enlarged, and is an operation
explanatory diagram of the diaphragms 5a and 5b in the low region. . In FIG. 3A, the broken lines
in the vertical direction of the diaphragms 5a and 5b indicate the positions after the movement
of the both.
[0050]
In the low region, before each divided vibration of the diaphragms 5a and 5b is started, the
diaphragm 5a tries to vibrate in the direction of the arrow Y6 orthogonal to the direction Y4 of
the magnetic flux in FIG. Vibrates in the direction of arrow Y7 orthogonal to the direction Y5 of
the magnetic flux in FIG. 1B, but the diaphragm 5a and the diaphragm 5b are connected to the
first magnetic pole 1b so as to have a substantially V-shaped cross section Therefore, the
vibration vectors in the directions of arrows Y4 and Y6 by the diaphragm 5a and the vibration
vectors in the directions of arrows Y5 and Y7 by the diaphragm 5b are combined, and the
diaphragms 5a and 5b are the speaker device 100. It vibrates in the arrow Y8 direction which is
the direction of the central axis L1 of As a result, the combined sound wave of the two
diaphragms 5a and 5b is emitted in the direction of the arrow Y8, which is the direction of the
central axis L1 of the speaker device 100, as indicated by the broken line area A1.
[0051]
Next, the operation of the diaphragms 5a and 5b in the high region will be described with
reference to FIG. 3 (b) and the like. FIG. 3 (b) is an enlarged cross-sectional view of the main part
of FIG. 1 (b) in which the vicinity of the first magnetic pole 1b and the diaphragms 5a and 5b is
enlarged, and is an operation explanatory diagram of the diaphragms 5a and 5b in the high
region. . In FIG. 3 (b), the broken lines existing in the vertical direction of the diaphragms 5a and
5b indicate the positions after movement of the both.
[0052]
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In the high frequency region, both ends of the diaphragms 5a and 5b have larger mechanical
impedance compared to the central portions of the diaphragms 5a and 5b, so there is less
vibration near the both ends, while vibration at the central portions Is large. Therefore, the
diaphragm 5a largely vibrates in the direction of the arrow Y6 orthogonal to the direction Y4 of
the magnetic flux in FIG. 1 (b) in the vicinity of its central portion, and the diaphragm 5b in FIG.
The sound wave generated by the vibration of the diaphragm 5a, which vibrates largely in the
arrow Y7 orthogonal to the direction Y5 of the magnetic flux in b), is emitted so as to have
directivity characteristics as shown in the broken line area A2, and the vibration of the
diaphragm 5b The sound wave generated by the above is emitted so as to have directivity
characteristics as shown by the broken line area A3. Thus, the vibration vectors of the two
diaphragms 5 a and 5 b are combined, and the combined sound wave is emitted in the direction
of the arrow Y 8 which is the direction of the central axis L 1 of the speaker device 100. That is,
in the very high frequency region where the wavelength is shorter than one side of the V-shaped
one of the diaphragms 5a and 5b, a large amount of radiation is emitted in the vibration direction
of the diaphragms 5a and 5b.
[0053]
Therefore, the speaker device 100 according to the present embodiment can radiate the sound
wave of the ultra high frequency band over a wide range in comparison with the first and second
comparative examples due to its structure.
[0054]
Further, since the two diaphragms 5a and 5b are arranged to have a substantially V-shaped
cross-sectional shape, compared with the structures of the first and second comparative
examples, in the direction of the central axis L1 of the speaker device 100. The strength of the
two diaphragms 5a and 5b is improved, and the strength of the two diaphragms 5a and 5b can
be improved.
In particular, in the above-described low band, as shown in FIG. 3A, the two diaphragms 5a and
5b after movement vibrate while maintaining the shape of the two diaphragms 5a and 5b as
expected. The strength of the two diaphragms 5a and 5b can be further improved. Further, in the
case of the high region, while the vibration decreases at both ends of the diaphragms 5a and 5b,
the diaphragms 5a and 5b move so that the vibration becomes large at their central portions.
And 5b are less likely to occur. That is, in the case of high sound pressure, the deformation of the
diaphragms 5a and 5b due to the radiation impedance is prevented.
12-04-2019
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[0055]
Further, in the present embodiment, by varying the angle of the substantially V-shaped crosssectional shape of the two diaphragms 5a and 5b, it is possible to set the directivity in the high
region to a desired directivity.
[0056]
Application Example 1 In the present invention, as Application Example 1, as shown in FIG. 4A,
the concavo-convex shape may be formed on the whole of the two diaphragms 5a and 5b.
Here, FIG. 4 (a) shows a cross-sectional view of the speaker device according to the application
example 1 corresponding to FIG. 1 (b). Further, instead of this, in the present invention, although
illustration is omitted, it is also possible to form a concavo-convex shape not in the whole of the
two diaphragms 5a and 5b but in a part.
[0057]
Application Example 2 In the present invention, as Application Example 2, as shown in FIG. 4B, a
stripe shape (line portion 5z) is formed on the entire two diaphragms 5a and 5b. It does not
matter. Here, FIG. 4B shows a perspective view of the speaker device according to the application
example 2 corresponding to FIG. 1A. Further, instead of this, in the present invention, although
not shown, it is also possible to form a streaky shape (striped portion 5z) not in the whole of the
two diaphragms 5a and 5b but in a part.
[0058]
Application Example 3 In the present invention, as Application Example 3, as shown in FIG. 4C,
one end 5 aa of the diaphragm 5 a located on the first magnetic pole 1 b side and the first
magnetic pole 1 b The one end 5ba of the diaphragm 5b located on the side is directly connected
with the visco-elastic material 6, and further, the one end 5aa and 5ba thereof are connected to
the upper end 1ba of the first magnetic pole 1b via the visco-elastic material 6 It may be
configured to be attached. With this configuration, it is easier to obtain bass as compared to the
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above embodiment. FIG. 4C is a cross-sectional view of the speaker device according to the
application example 3 corresponding to FIG. 1B.
[0059]
Application Example 4 Next, the configuration of a speaker device 101 according to Application
Example 4 of the present invention will be described with reference to FIG. In addition, in the
application example 4, the same code | symbol is attached | subjected about the element which is
common in said Example, The description is simplified or abbreviate | omitted. FIG. 5 shows a
cross-sectional configuration of a speaker apparatus 101 according to application 4 of the
present invention corresponding to FIG. 1 (b).
[0060]
The speaker device 101 has an opening on the upper surface, a yoke 1 having a cylindrical
shape, a magnet 2 disposed at a substantially central position on the yoke 1, a rectangular
parallelepiped shape, and a trapezoidal sectional shape. And a magnetic circuit including a plate
7 formed in a rectangular shape, two diaphragms 5a and 5b, and a drive unit (not shown)
(corresponding to the drive unit 70). .
[0061]
The yoke 1 has a second magnetic pole 10 formed in a curved cross-sectional shape, and a third
magnetic pole 11 formed in a bowl-shaped cross-sectional shape.
One end face side of the magnet 2 located on the yoke 1 side is magnetized to the S pole, and the
other end face side of the magnet 2 located on the plate 7 side is magnetized to the N pole. In the
present invention, the magnetized states may be reversed. The magnet 2 and the plate 7
constitute a first magnetic pole. A recess 7 b and an inclined surface 7 a are respectively formed
on the upper end surface of the plate 7. The first magnetic gap 4a is formed between the inclined
surface 7a which is an element of the first magnetic pole and the one end side 1c of the yoke 1
which is the second magnetic pole 10, and the inclined surface 7a A second magnetic gap 4b is
formed between the vicinity of the upper end face of the plate 7 which is an element of the first
magnetic pole and the other end 1d of the yoke 1 which is the third magnetic pole 11 located on
the opposite side. ing. The direction of the magnetic flux in the first magnetic gap 4a is set in the
arrow Y20 direction from the inclined surface 7a of the plate 7 to the one end side 1c of the yoke
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1 and the direction of the magnetic flux in the second magnetic gap 4b is the plate It is set in the
arrow Y 21 direction from the upper end face 7 to the other end 1 d of the yoke 1. Therefore, the
shape formed by connecting the magnetic flux generated in the first magnetic gap 4a and the
magnetic flux generated in the second magnetic gap 4b is substantially V-shaped.
[0062]
The one end 5aa of the diaphragm 5a and the one end 5ba of the diaphragm 5b are connected
by the visco-elastic material 6, and the one ends 5aa and 5ba of the diaphragms 5a and 5b are
connected via the visco-elastic material 6 to the yoke 1 Is mounted in the recess 7b. The other
end of the diaphragm 5a is attached to one end 1c of the yoke 1 via the visco-elastic material 6,
and the other end of the diaphragm 5b is provided with an edge 5v having a V-shaped cross
section. One end side of 5 v is attached to the other end side 1 d of the yoke 1 via a gasket
(buffer material) 8. Thereby, the shape which combines the diaphragm 5a and the diaphragm 5b
becomes a substantially V-shaped cross-sectional shape, and each of the diaphragms 5a and 5b
inclines toward the direction to mutually approach. The speaker device 101 according to the
application example 4 having the above configuration emits a sound wave in the direction of the
arrow Y1 according to the same principle as the speaker device 100 according to the above
embodiment, and exhibits the same function and effect as the above embodiment.
[0063]
Further, in the application example 4, the second magnetic pole 10 is formed to have a curved
cross-sectional shape, and the inclined surface 7 a is provided on the plate 7 which is an element
of the first magnetic pole, The magnetic flux is concentrated between the inclined surface 7a and
the one end side 1c of the yoke 1 which is an element of the second magnetic pole 10 by
separating the two magnetic poles 10 from each other. Thereby, in the first magnetic gap 4a
formed between the first magnetic pole and the one end side 1c of the yoke 1, the leakage of the
magnetic flux can be reduced. In other words, the magnetic flux can be prevented from being
weakened. .
[0064]
In the present invention, a wave (corrugated) edge 5w may be provided on the other end side of
the diaphragm 5a located on one end side 1c of the yoke 1, and further, on the other end side of
the diaphragm 5b. The V-shaped edge 5v provided may be replaced with the same corrugated
(corrugated) edge 5W.
12-04-2019
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[0065]
Application Example 5 In the present invention, as application example 5, as shown in FIG. 6A, a
diaphragm mounting member 13 having a V-shaped cross section is provided, and vibration is
applied to the diaphragm mounting member 13. The plates 5a and 5b may be attached.
Here, FIG. 6A is a cross-sectional view of an essential part showing a state in which the
diaphragms 5 a and 5 b of the speaker device 101 shown in FIG. 6 are attached to the diaphragm
mounting member 13. 6 (b) is a plan view of the diaphragm mounting member 13 as viewed in
the direction of arrow Y28 in FIG. 6 (a).
[0066]
As shown in FIGS. 6A and 6B, the diaphragm mounting member 13 is formed into a substantially
V-shaped cross-sectional shape and a rectangular planar shape, and one end 5aa of the
diaphragm 5a and the diaphragm A first support portion 13a having a concave shape is
supported in a state in which one end side 5ba of 5b is inserted, and a second support portion
13c supporting the other end side of the diaphragm 5a and the edge 5v of the diaphragm 5b.
And a third support 13b provided between the first support 13a and the second support 13c and
disposed in parallel with the diaphragms 5a and 5b, respectively. In a preferred example, after
assembling the magnetic circuit of the speaker device, the first support portion 13a is preferably
formed in a shape that can be slid and attached to the recess 7b of the plate 7 shown in FIG.
Thereby, shortening of the manufacturing time of a speaker apparatus can be achieved.
[0067]
Next, with reference to FIGS. 7A and 7B, the operation of the diaphragms 5a and 5b according to
the application example 5 will be described. FIG. 7A is a cross-sectional view corresponding to
the diaphragm mounting member 13 and the diaphragms 5a and 5b in FIG. 6A, and is an
operation explanatory diagram of the diaphragms 5a and 5b in the low band. FIG. 7B is a crosssectional view corresponding to the diaphragm mounting member 13 and the diaphragms 5a and
5b in FIG. 6A, and is an operation explanatory diagram of the diaphragms 5a and 5b in the high
region. In FIGS. 7A and 7B, broken lines in the vertical direction of the diaphragms 5a and 5b
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indicate the positions after movement of the both.
[0068]
The operation of the diaphragms 5a and 5b in the low band and the high band in the application
example 5 is the same as that of the above-described embodiment. However, in the application
example 5, the first support portion 13 of the diaphragm mounting member 13 via the viscoelastic material 6 (or silicone) may be used for the one end 5aa of the diaphragm 5a and the one
end 5ba of the diaphragm 5b. , And the other end sides of the diaphragm 5a and the diaphragm
5b are respectively attached to the second support 13c of the diaphragm mounting member 13
via the viscoelastic material 6 and the like, As compared with the present embodiment, the
diaphragms 5a and 5b can be vibrated more stably at the time of the low band and the high
band.
[0069]
(Application 6) In the present invention, as application 6, as shown in FIGS. 8 (a) and 8 (b), the
diaphragms 5a and 5b are not shown via the impedance conversion transformer 14 (not shown) ,
And may be configured to be connected to the FIG. 8B is a side view of an essential part showing
a connection state of the diaphragms 5a and 5b and the impedance conversion transformer 14
shown in the application example 5. As shown in FIG. FIG. 8A is a plan view of an essential part
on one side showing a connection state of the diaphragms 5a and 5b shown in the application
example 5 and the impedance conversion transformer 14 when observed from the direction of
arrow Y40 in FIG. 8B. .
[0070]
That is, since the diaphragms 5a and 5b according to the present embodiment are so-called
ribbon diaphragms and their electrical impedance is extremely low, it is effective to convert them
into an appropriate impedance when connecting them to the drive unit. is there. Therefore, in the
application example 6, the impedance conversion transformer 14 having a function of converting
into an appropriate impedance is provided, and the diaphragms 5a and 5b are connected to the
secondary transformer 14c of the impedance conversion transformer 14.
12-04-2019
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[0071]
Specifically, the impedance conversion transformer 14 is generally also referred to as a matching
transformer, and includes a transformer core 14a, a primary side transformer 14b, a secondary
side transformer 14c, and a copper plate 14d drawn from the secondary side transformer. , And
an input copper wire 14e drawn from the primary side transformer 14b and supplied with a
drive current from a drive unit (not shown). One end side of the diaphragm 5a electrically
connected to the impedance conversion transformer 14 is bent, and the bent portion 5ax is
electrically connected to the copper plate 14d through the solder 9 whose main component is
aluminum or the like. . Thereby, the impedance conversion transformer 14 is configured to
perform impedance conversion of the drive current supplied from the drive unit and supply the
same to the diaphragms 5a and 5b. In this way, it is possible to prevent the conversion efficiency
from being reduced particularly during high-frequency reproduction.
[0072]
Further, in the application example 6, the diaphragms 5a and 5b are attached to the diaphragm
mounting member 13 at the time of manufacture, and the diaphragms 5a and 5b are electrically
connected to the secondary transformer 14c of the impedance conversion transformer 14. For
example, the subsequent steps can be simplified as in the application example 5 described above.
[0073]
Application Example 7 In the present invention, as Application Example 7, as shown in FIG. 9, the
configuration of Application Example 6 may be slightly changed.
FIG. 9 is a principal part side view showing the connection state of the diaphragms 5a and 5b
according to the application example 7 and the impedance conversion transformer 14
corresponding to FIG. 8B.
[0074]
That is, in the application example 7, the bent portion 5ax of the diaphragm 5 is connected to the
terminal plate 17 made of a conductive material through the solder 9, and the terminal plate 17
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23
is connected to the copper plate 14d of the impedance conversion transformer 14 through the
solder 9. It is connected. Thereby, the same effect as that of the application example 6 can be
obtained.
[0075]
Application Example 8 In the present invention, as application example 8, as shown in FIGS. 10A
and 10B, the diaphragms 5a and 5b are formed of a conductive material having conductivity,
such as metal foil. Instead, the diaphragms 5a and 5b may be configured to include the resin film
and the wiring (conductor) 18 formed on the surface thereof. Here, FIG. 10A is a plan view
showing a planar configuration of the diaphragm 55 according to the application example 8. As
shown in FIG. FIG. 10 (b) shows a cross-sectional view of the diaphragm 55 along the cutting line
B-B 'of FIG. 10 (a).
[0076]
The diaphragm 55 has two resin film bodies 55a and 55b having a ribbon shape and a strip
shape, and a wiring (conductor) 18 integrally formed on the resin film bodies 55a and 55b, and
has a cross section. It has a V-shaped shape.
[0077]
The wiring (conductor) 18 has terminals 18 a and 18 b connected to plus / minus wiring on the
drive unit (corresponding to the drive unit 70) side.
The wiring 18 is integrally and spirally formed on the surface on the sound output side of the
resin film bodies 55a and 55b. Further, one end of the wiring 18 is connected to the terminal
18b at a predetermined position on the surface on the sound output side of the resin film body
55b, and a part of the wiring 18 extending from the terminal 18b is opposite to the sound
emission side of the resin film body 55b. It is drawn around on the side surface and connected to
the terminal 18c formed on the opposite side surface. Thereby, a drive current can be supplied to
the wiring 18 from a drive unit (not shown). In this configuration, since the wiring 18 is formed
in a spiral on the surface on the sound output side of the diaphragm 55, the direction of the drive
current flowing through the resin film body 55a and the direction of the drive current flowing
through the resin film body 55b Is set to be relatively reverse. For example, assuming that a drive
current flows in the direction of arrow Y25 in wiring 18 formed in resin film body 55a, the drive
12-04-2019
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current in the direction of arrow Y24 opposite to arrow Y25 flows in wiring 18 formed in resin
film body 55b. It will flow. As a result, based on Fleming's left-hand rule, the resin film body 55a
and the resin film body 55b can be vibrated with the same driving force and in the same
direction. Therefore, the operation and effect of the above-described embodiment can be
obtained.
[0078]
(Application Example 9) Further, in the present invention, as Application Example 9, one metal
foil or the like is formed into a substantially V-shaped form obtained by combining the
diaphragm 5a and the diaphragm 5b of the above-described embodiment. The conductor may be
bent a plurality of times to form a diaphragm.
[0079]
The structure of the diaphragm 56 which concerns on the application example 9 is shown to
Fig.11 (a) thru | or (c).
FIG. 11A shows a planar configuration of the diaphragm 56 when observed from the direction in
which the sound wave is emitted. FIG. 11 (b) shows a cross-sectional view of the diaphragm 56
along the cutting line C-C 'of FIG. 11 (a). FIG. 11C shows a side view of the diaphragm 56 as
viewed in the direction of arrow Y30 in FIG.
[0080]
The diaphragm 56 is formed by bending a conductor made of one metal foil or the like a plurality
of times and has a substantially V-shaped cross-sectional shape, and two sound emitting portions
5xa and 5xb, and sound emitting portions 5xa and 5xb And an edge 5xc having a waveform
formed on one end side of each of Further, a bent portion 5xd connected to the first magnetic
pole 1ba shown in FIG. 1B is formed on the other end side of the sound emitting portions 5xa
and 5xb.
[0081]
The diaphragm 56 having such a configuration is manufactured as follows.
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25
[0082]
First, as shown in FIG. 11D, a ribbon-like and strip-like conductor 5x made of one metal foil or
the like is prepared (step P1).
Next, as shown in FIG. 11E, the vicinity of the center of the conductor 5x is bent at a substantially
right angle (step P2). Next, a part of the conductor 5x that is to become the sound emitting part
5xb is bent at substantially a right angle so as to have an arrangement relationship parallel to a
part of the conductor 5x that is to be the sound emitting part 5xa (process P3). Thus, the sound
emitting portions 5xa and 5xb are formed. Next, as shown in FIGS. 11A to 11C, a wave-shaped
edge 5xc is formed on each one end side of the sound emitting portions 5xa and 5xb, and on the
other end side of the sound emitting portions 5xa and 5xb. A bent portion 5xd connected to the
first magnetic pole 1ba or the like is formed. Thus, the diaphragm 56 according to the
application example 9 shown in FIGS. 11A to 11C is manufactured. Since the diaphragm 56
having the above configuration is formed in a substantially V-shaped cross-sectional shape as in
the above-described embodiment, the operation and effects of the above-described embodiment
can be obtained.
[0083]
(Application Example 10) In general, in the high frequency range reproduction speaker device, a
peak (peak) or a dip (valley) tends to easily occur in the high frequency range. Therefore, a phase
equalizer (equalizer or an acoustic diffuser for a magnetic material or a throttling device for
increasing acoustic load) is provided in front of the diaphragm to flatten such high frequency
characteristics and improve directivity characteristics. There is.
[0084]
In the application example 10 of the present invention, in order to realize the above object, a
phase equalizer is provided at a predetermined position of the speaker device on the premise of
the same configuration as the above embodiment. The configuration will be described below with
reference to FIGS. 12 (a) and 12 (b). In addition, in the application example 10, the same code |
symbol is attached | subjected about the element which is common in the speaker apparatus 100
based on an above-described Example, and the description is simplified or abbreviate | omitted.
12-04-2019
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[0085]
Fig.12 (a) shows the perspective view of the speaker apparatus 102 based on the application
example 10 of this invention corresponding to FIG.1 (b). FIG. 12B is a perspective view showing
the configuration of the phase equalizer 35. As shown in FIG.
[0086]
The configuration of the speaker device 102 according to the application example 10 is basically
the same as the configuration of the speaker device 100 according to the above-described
embodiment. However, the speaker device 102 is different in configuration from the speaker
device 100 in that a phase equalizer is provided. The speaker device 102 and the speaker device
100 are slightly different in size.
[0087]
The phase equalizer 35 is formed of a material having an insulating property, has an inverted Tshape and a convex cross-sectional shape and a side shape, and has a first portion 35a having a
rectangular parallelepiped shape and the first portion 35a. And a second portion (convex portion)
35 b protruding upward from a substantially central position. The second portion 35b functions
to control the directivity characteristic and the output sound pressure characteristic by changing
the length appropriately, and shields each of the conductive diaphragm 5a and the diaphragm 5b
from each other. It serves to insulate by preventing a short circuit between the diaphragm 5a and
the diaphragm 5b.
[0088]
The phase equalizer 35 is installed in the speaker device 102 in a state where one end face side
of the first portion 35 which is the element thereof is attached to the upper end 1 ba of the first
magnetic pole 1 b. The one end side of the diaphragm 5a and the one end side of the diaphragm
5b are attached to the upper surface of the first portion 35a of the phase equalizer 35 with the
second portion 35b interposed therebetween. For this reason, the second portion 35b of the
12-04-2019
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phase equalizer 35 protrudes upward between the two diaphragms 5a and 5b in the sound
emitting direction.
[0089]
The speaker device 102 according to the application example 10 having the above-described
configuration exhibits unique operational effects as compared with the comparative example
described below.
[0090]
FIG. 13 shows a cross-sectional configuration of a speaker device according to a comparative
example having a phase equalizer.
[0091]
The speaker device 52 according to the comparative example is a so-called leaf type speaker
device, which has an opening on the top surface, a yoke 1 having a cylindrical shape, a magnet 2
disposed substantially at the center of the yoke 1, and a magnet 2, a magnetic circuit including a
plate 3 disposed on top of the two, two diaphragms 5 a and 5 b including a wire 38 to which a
drive current is supplied from a drive unit (not shown), and a triangular cross section And a
phase equalizer 35x which has a shape and functions to control directivity characteristics and
output sound pressure characteristics.
[0092]
In the comparative example having such a configuration, the height of the phase equalizer 35x is
high, so that there is an advantage that the frequency that can be controlled is wide, but the
height of the speaker device 52 corresponding to the sound radiation direction There is a
problem that it is difficult to meet the demand for thinning the speaker device 52 because d2
becomes high.
[0093]
On the other hand, in the speaker device 102 according to the application example 10, on the
first magnetic pole located below the second magnetic pole 10 and the third magnetic pole 11,
from between the two diaphragms 5a and 5b Since the phase equalizer 35 is provided to project
upward, the thickness of the speaker device 102 can be reduced even if the height d1 of the
second portion 35b of the phase equalizer 35 is set to be the same height as the comparative
12-04-2019
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example. Can be realized.
Therefore, in the application example 10, the protrusion amount (height d1) of the second
portion 35b of the phase equalizer 35 can be reduced in accordance with the application, and the
thinning of the speaker device can be realized.
That is, a thin ribbon type speaker device can be obtained.
Moreover, since it has such a configuration, the range in which the height of the phase equalizer
35 can be changed is expanded, and correction can be made to obtain desired sound pressure
characteristics.
[0094]
Further, since the phase equalizer 35 is formed of an insulating material and provided between
the two diaphragms 5a and 5b, the second portion 35b of the phase equalizer 35 is formed of
two diaphragms. It functions as a shielding plate that shields 5a and 5b, and serves to insulate
two conductive diaphragms 5a and 5b.
As a result, the occurrence of a short circuit between the diaphragm 5a and the diaphragm 5b
can be prevented.
[0095]
Moreover, in the speaker device 102 according to the application example 10, since the phase
equalizer 35 functioning as a shielding plate is included, peaks and dips can be suppressed in the
high region, and the high region frequency can be flattened. In this regard, referring to FIG. 12
(c), the sound pressure of the other comparative example and the sound pressure of the speaker
device 102 according to the application example {Sound. The characteristics of Presure Level
(SPL (dB)) and frequency (Hz) are compared and examined. Here, it is assumed that the other
comparative example does not have the phase equalizer 35 functioning as a shielding plate
between the two diaphragms 5 a and 5 b on the premise of the configuration of the speaker
device 102.
12-04-2019
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[0096]
FIG. 12C is a graph showing the relationship between the sound pressure and the frequency
characteristic of the speaker device 102 according to another comparative example and
application example 10. A graph G1 indicated by a solid line shows the relationship between the
sound pressure and the frequency characteristic of the speaker device 102 according to the
application example 10. On the other hand, a graph G2 indicated by a broken line shows the
relationship between the sound pressure and the frequency characteristic of another
comparative example.
[0097]
As shown in the figure, it can be seen that in the high frequency band of 10000 (Hz) or more, the
application example 10 is flatter than the other comparative examples. Therefore, in the speaker
device 102 according to the application example 10, the high frequency band can be flattened,
and a good sound pressure characteristic can be obtained in the high frequency band.
[0098]
In addition, in the application example 10, the same effect as the above-mentioned Example can
be acquired as another effect.
[0099]
It is a perspective view and a sectional view showing composition of a speaker apparatus
concerning an example of the present invention.
It is sectional drawing which shows the structure of the speaker apparatus which concerns on
various comparative examples. It is sectional drawing explaining the operation | movement of the
diaphragm which concerns on a present Example. It is sectional drawing and a perspective view
which show the structure of the speaker apparatus which concerns on the application examples
1 to 3 of this invention. It is sectional drawing which shows the structure of the speaker
apparatus based on the application example 4 of this invention. The cross-sectional view etc. of a
12-04-2019
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structure of the diaphragm attached to the member for diaphragm mounting which concerns on
the application example 5 of this invention are shown. FIG. 21 is a cross-sectional view for
explaining the operation of the diaphragm according to application example 5; The cross section
etc. of the connection state of the diaphragm and impedance conversion transformer which
concern on the application example 6 of this invention are shown. The cross section etc. of the
connection state of the diaphragm and impedance conversion transformer which concern on the
application example 7 of this invention are shown. It is the top view and sectional drawing which
show the structure of the diaphragm concerning the application example 8 of this invention.
They are a top view, a side view, and a sectional view showing composition of a diaphragm
concerning application example 9 of the present invention. The perspective view etc. of the
speaker apparatus which concerns on the application example 10 of this invention, and a phase
equalizer are shown. It is sectional drawing which shows the structure of the speaker apparatus
which has a phase equalizer which concerns on a comparative example.
Explanation of sign
[0100]
DESCRIPTION OF SYMBOLS 1 yoke 1 b 1st magnetic pole 2a, 2b magnet 3a, 3b plate 4a 1st
magnetic gap 4b 2nd magnetic gap 5a, 5b, 55, 56 diaphragm 6 visco-elastic material 10 2nd
magnetic pole 11 3rd magnetic pole 13 diaphragm mounting member 14 impedance conversion
transformer 18 wiring 35 phase equalizer 70 driving unit 100, 101, 102 speaker device
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