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JP2016046709

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DESCRIPTION JP2016046709
The present invention provides an electro-acoustic transducer which is formed of a pair of
curved surfaces and in which the main axis of directivity is inclined in the extending direction of
the valleys of the vibrator which forms the valleys between the curved surfaces. A vibrating body
(20) has a planar coil on the upper end side of a joint portion between a diaphragm (20A) and a
diaphragm (20B). When an audio signal is supplied to the planar coil, the vibrating body 20
vibrates in the front-rear direction. The vibrating body 20 has elasticity, and the vibration on the
upper end side of the vibrating body 20 is transmitted to the lower end side with delay, and the
vibration of the lower end portion of the vibrating body 20 is delayed in phase from the upper
end portion. When the vibration has a phase difference in the vertical direction, the traveling
direction of the sound wave generated from the vibrating body 20 is inclined downward.
[Selected figure] Figure 1
Electro-acoustic transducer
[0001]
The present invention relates to an electroacoustic transducer.
[0002]
Patent Document 1 discloses an electroacoustic transducer using a diaphragm formed in a
curved surface.
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1
In this electro-acoustic transducer, a linear conductor pattern is provided along the longitudinal
direction of the magnetic gap in the flat plate portion of the diaphragm positioned in the
magnetic gap. When an audio signal is fed to the conductor pattern, a driving force is generated
by the current of the audio signal and the magnetic field of the magnetic gap, and the flat plate
portion is vibrated by the driving force to emit a sound from the diaphragm. Ru. The sound to be
emitted is emitted in the front direction by driving the entire flat plate portion.
[0003]
Japanese Patent Laid-Open No. 2002-78079
[0004]
In the electro-acoustic transducer of Patent Document 1, the direction of the main axis of the
directivity characteristic is the front direction of the electro-acoustic transducer.
The main axis of the directivity characteristic is the direction indicated by the main directivity
characteristic (main lobe). Depending on the installation environment of the electro-acoustic
transducer, the main axis of the directional characteristic may be inclined to be other than the
front direction. However, in the electro-acoustic transducer of Patent Document 1, the main axis
of the directional characteristic may be inclined other than the front direction Can not. Although
it is possible to adjust the direction of the main axis of the directivity characteristic by changing
the direction of the electroacoustic transducer, it may be difficult to change the direction
depending on the installation environment of the electroacoustic transducer.
[0005]
The present invention is made under the above-mentioned background, and is formed of a pair of
curved surfaces, and the main axis of the directional characteristic in the extension direction of
the valleys of the vibrator forming the valleys between the curved surfaces It is intended to
provide an electro-acoustic transducer which can be tilted.
[0006]
In the present invention, a pair of vertical split cylindrical surfaces are formed in parallel, and a
vibrator for forming a valley between the adjacent vertical split cylindrical surfaces, and one end
side of the valley in the extending direction A conversion unit which is disposed and converts a
vibration along the depth direction of the valley and an electrical signal corresponding to the
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vibration, and a support which vibratably supports the vibrator in the depth direction of the
valley To provide an electroacoustic transducer.
[0007]
In the present invention, the conversion unit includes a magnetic circuit having an air gap, and a
coil provided in the vibrating body and located in the air gap and through which the electric
signal flows, and the magnetic circuit or the coil May be disposed at one end side of the valley in
the extending direction.
[0008]
Further, in the present invention, the vibrator may have a damping member for damping the
vibration of the vibrator on the other end side in the extending direction of the valley portion.
[0009]
Further, in the present invention, a plurality of the vibrators are provided, the plurality of
vibrators are disposed in the extending direction of the valleys, the converter is provided for each
of the plurality of vibrators, and the electric signal of each converter The delay processing may
be performed according to the position where the corresponding vibrator is disposed.
[0010]
According to the present invention, in the electro-acoustic transducer, the main axis of the
directivity characteristic can be inclined in the extending direction of the valley portion of the
vibrator which is formed of the pair of curved surfaces and forms the valley portion between the
curved surfaces. .
[0011]
BRIEF DESCRIPTION OF THE DRAWINGS The external view of the speaker 1 which concerns on
one Embodiment of this invention.
The front view of the speaker 1.
AA sectional view taken on the line of FIG.
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BB sectional drawing of FIG.
The external view of diaphragm 20A.
The schematic diagram of the planar coil 100 and a magnetic circuit.
The figure for demonstrating the direction of the sound emitted from the speaker 1. FIG. The
schematic diagram of the magnetic circuit which concerns on the modification of 1st
Embodiment. The disassembled perspective view of the speaker 1A which concerns on 2nd
Embodiment. FIG. 7 is a perspective view showing an assembled state of the speaker 1A. The top
view of speaker 1A. The arrow sectional drawing which follows the DD line of FIG. The semisection perspective view cut | disconnected by the DD line of FIG. The figure which showed the
modification of the vibrating body 1001. FIG. The figure which showed the modification of the
vibrating body 1001. FIG. The figure which showed 1 modification of the speaker. The figure
which showed the modification of 1A of a speaker.
[0012]
First Embodiment FIG. 1 is an external view of a speaker 1 (electro-acoustic transducer)
according to an embodiment of the present invention, FIG. 2 is a front view of the speaker 1, and
FIG. 3 is an AA view of FIG. FIG. 4 is a cross-sectional view taken along the line B-B of FIG. In the
figure, the directions are indicated by the X, Y, and Z axes orthogonal to each other. The left and
right direction when the speaker 1 is viewed from the front is the direction of the X axis, and the
front and back direction is the direction of the Y axis, height ) Direction is the direction of the Z
axis. In the following description, for convenience of explanation, the positive direction side of
the X axis is the right side, the negative direction side of the X axis is the left side, the positive
direction side of the Y axis is the front side, the negative direction side of the Y axis is the rear
side, The positive direction side may be referred to as the upper side, and the negative direction
side of the Z axis may be referred to as the lower side. The dimensions of the respective members
in the drawing are different from the actual dimensions so that the shapes and positional
relationships of the respective members can be easily understood.
[0013]
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The speaker 1 is roughly divided into a housing, a magnetic circuit, a support member for
supporting the magnetic circuit, and a vibrator. The top plate 10A, the bottom plate 10B, the side
plate 10C, the side plate 10D, and the side plate 10E are, for example, plates obtained by
processing wood into a rectangular shape, and form a housing of the speaker 1. A side plate 10C
and a side plate 10E facing each other in the X-axis direction are disposed between the top plate
10A and the bottom plate 10B facing each other in the vertical direction, and a side plate 10D is
disposed on the rear side. The end face is fixed to the top plate 10A and the bottom plate 10B. In
addition, the material of each board is not limited to a wood, A synthetic resin etc. may be
sufficient.
[0014]
The support members 60A and 60B are members that support the magnets 30A and 30B, and
are, for example, square bars made of synthetic resin. A magnetic circuit according to the present
embodiment is configured by the magnets 30A, 30B and yokes 40A, 40B 40D, and 40E described
later. One end of the support member 60A is fixed to the side plate 10E at one end in the
longitudinal direction, and the magnet 30A is fixed to the other end, and one end of the support
member 60B is fixed to the side plate 10C at the longitudinal direction, and the magnet 30B is
fixed to the other end It is done.
[0015]
The magnets 30A and 30B are rectangular parallelepiped permanent magnets. As shown in FIG.
4, the magnet 30A is arranged by the support member 60A so that the side surface is along the
Z-axis direction, and the N pole is on the front side and the S pole is on the rear side when viewed
from the upper side. Further, the magnet 30B is arranged by the support member 60B such that
the side surface is along the Z-axis direction, and when viewed from the upper side, the N pole is
the rear side and the S pole is the front side.
[0016]
The yokes 40A, 40B, 40D, and 40E are members for controlling the paths of magnetic lines of
force of the magnets 30A and 30B. In the present embodiment, each yoke is a rectangular iron
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plate. The yoke 40A is bonded to the N pole of the magnet 30A, and the yoke 40B is bonded to
the S pole of the magnet 30A. The yoke 40D is bonded to the S pole of the magnet 30B, and the
yoke 40E is bonded to the N pole of the magnet 30B.
[0017]
By arranging the magnets 30A, 30B and the yokes 40A, 40B, 40D, 40E in this manner, a
magnetic circuit is formed in the housing of the speaker 1. The north pole of the magnet 30A is
in contact with the yoke 40A, and the south pole of the magnet 30B is in contact with the yoke
40D located across the air gap with the yoke 40A. Therefore, between the yoke 40A and the yoke
40D, The direction of the magnetic field is the direction from the yoke 40A to the yoke 40D.
Further, the south pole of the magnet 30A is in contact with the yoke 40B, and the north pole of
the magnet 30B is in contact with the yoke 40E located on both sides of the yoke 40B and the air
gap. The direction is from the yoke 40E to the yoke 40B.
[0018]
The vibrating body 20 is composed of a vibrating plate 20B and a vibrating plate 20A having a
flat coil 100. The diaphragm 20A and the diaphragm 20B are rectangular and elastic films of
synthetic resin, but the material is not limited, and materials such as synthetic resin, paper, metal
and the like generally used as a diaphragm of a speaker are used. be able to. The front end of the
diaphragm 20A is fixed to the front end of the side plate 10E, and the front end of the diaphragm
20B is fixed to the front end of the side plate 10C. Therefore, the front end portions of the
diaphragm 20A and the diaphragm 20B are not displaced, and the curved surface is bent and
vibrated to be able to vibrate in the depth direction of the valley. Here, the end of the side plate
10E to which the diaphragm 20A is fixed and the end of the side plate 10C to which the
diaphragm 20B is fixed correspond to the supporting portion according to the present invention
which vibratably supports the vibrator. In the diaphragms 20A and 20B, the rear side portions
are bonded to each other, and as shown in FIG. 3, the rear side portion (hereinafter referred to as
a bonded portion 80) bonded is the yoke 40A and the yoke It is bent so as to be located in the air
gap between 40D and the air gap between the yoke 40B and the yoke 40E.
[0019]
That is, when viewed from the upper side as shown in FIG. 3, the diaphragm 20A is curved so as
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to be gradually separated from the side plate 10E as it goes from the fixed front portion to the
joint portion 80. Also, the diaphragm 20A is not curved in the vertical direction in which the joint
portion 80 extends. Thus, the diaphragm 20A has a vertically split cylindrical shape obtained by
dividing the cylindrical member in the axial direction of the cylindrical portion. Hereinafter, the
surface of the vertically split cylindrical shape is referred to as a vertically split cylindrical
surface. Similarly, when viewed from the upper side as shown in FIG. 3, the diaphragm 20B is
also curved so as to gradually move away from the side plate 10C as it goes from the fixed front
portion to the joint portion 80. It has the same vertically split cylindrical shape. The portions of
the diaphragm 20A and the diaphragm 20B located in the air gap are not in contact with the
respective yokes. As described above, the diaphragm 20A and the diaphragm 20B are arranged
in the X-axis direction, and the portions on the rear side are adhered to each other, so that the
longitudinally split cylindrical surfaces of the vibrator 20 become parallel. And between the
diaphragm 20A and the diaphragm 20B, the valley part extended linearly is formed along the upand-down direction of a vertical split cylindrical surface. As shown in FIG. 3, the diaphragm 20A
and the diaphragm 20B have a common tangent L to the diaphragm 20A and the diaphragm 20B
when viewed from the upper side, and are formed in line symmetry with this tangent L. However,
in the present invention, it is not always necessary to be line symmetrical. The vertically split
cylindrical surface does not necessarily have to be a single circular arc surface, but a plurality of
continuous curvatures, the cross section viewed from the upper side has a constant or
continuous change in curvature such as a parabolic shape or a spline curve A thing, what was
made into a square tube-like surface, and what was made into the shape which has a several step
part in step shape etc. is employable.
[0020]
FIG. 5 is a view showing the arrangement position of the planar coil 100. As shown in FIG. The
planar coil 100 is a coil in which a conductor (conductor) having a circular cross section is
disposed in a spiral shape. As shown in FIG. 5, the planar coil 100 is disposed on the upper end
side in the vertical direction on the rear side of the diaphragm 20A. The planar coil 100 has a
linear portion, and the linear portion on the front side is located between the yoke 40A and the
yoke 40D, and the linear portion on the rear side includes the yoke 40B and the yoke 40E
Located between In addition, the conducting wire which forms the planar coil 100 is not limited
to a conducting wire whose cross section is circular, but may be a strip-like conducting wire.
Lead wires (not shown) are connected to both ends of the wire of the planar coil. The planar coil
100 may be provided not on the diaphragm 20A but on the diaphragm 20B.
[0021]
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FIG. 6 is a view schematically showing the planar coil 100, the magnet 30A constituting the
magnetic circuit, the magnet 30B, and the yokes 40A, 40B, 40D, and 40E. The planar coil 100
and the above-described magnetic circuit function as an actuator (converter) that drives the
vibrating body 20. Between the yoke 40A and the yoke 40D, the direction of the magnetic field is
from the yoke 40A to the yoke 40D, and between the yoke 40B and the yoke 40E, the direction
of the magnetic field is from the yoke 40E to the yoke 40B. It is in the direction. In this state,
when current flows in the direction of the arrow shown in FIG. 6, current flows downward in a
portion of planar coil 100 between yokes 40A and 40D. In this case, according to Fleming's lefthand rule, a force acts on the positive direction side (front side) of the Y-axis on the portion of
the planar coil 100 between the yoke 40A and the yoke 40D. Further, when current flows in the
direction of the arrow shown in FIG. 6, current flows upward in a portion of planar coil 100
between yoke 40B and yoke 40D. Again, according to Fleming's left-hand rule, a force acts on the
positive direction side (front side) of the Y-axis on the portion of the planar coil 100 between the
yoke 40B and the yoke 40D. When the current flows in the direction opposite to the direction
shown in FIG. 6, the direction of the force acting on the planar coil 100 becomes the negative
direction side (rear side) of the Y axis.
[0022]
The planar coil 100 is displaced in response to changes in the current of the audio signal. The
planar coil 100 is fixed to the diaphragm 20A, and a portion of the diaphragm 20A to which the
planar coil 100 is fixed is bonded to the diaphragm 20B. The part is displaced. The portion to
which the planar coil 100 is fixed is displaced in the positive or negative direction of the Y axis
according to the audio signal, and the displacement direction changes sequentially to become a
vibration, and its vibration state (frequency, amplitude, phase) Sound waves are generated from
the vibrator 20 according to the above.
[0023]
In the present embodiment, the vibrating body 20 has elasticity, and the portion where the
planar coil 100 is absent in the joint portion 80, that is, the portion below the planar coil 100 in
FIG. Therefore, the vibration of the portion (lower side) where the planar coil 100 is not present
in the joint portion 80 lags in phase behind the vibration of the portion where the planar coil
100 is present. Then, if there is a phase difference in vibration in the vertical direction at the
joint portion 80, the traveling direction (the normal direction of the wave front of the sound
wave) of the sound wave generated from the vibrating body 20 is inclined downward. That is, the
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main axis of the directivity characteristic is inclined in directions other than the front.
[0024]
Specifically, for example, as shown in FIG. 7, when the sound velocity in the air is Ca (m / s) and
the sound velocity transmitted through the vibrating body 20 is Cpx (m / s) (generally, Cpx> Ca).
In the lower side of the joint portion, the phase is delayed in the vibration as compared to the
upper side, and the angle α (degree) between the wave front of the sound wave generated from
the joint portion 80 and the Z axis is It becomes an angle.
[0025]
According to this equation, for example, when the angle α between the Z axis and the wavefront
is 30 degrees, the material of the vibrating body 20 is set so that the speed of sound traveling
through the vibrating body 20 is twice as fast as the speed of sound in air. If set, even if a
plurality of speakers and signal delay processing circuits are not provided like a speaker array,
the sound waves generated from the speaker 1 will advance downward by 30 degrees and the
main axis of the directivity characteristic is not in the front direction. It will tilt in the direction.
In addition, it is possible to control directivity characteristics with one speaker without requiring
a plurality of speakers as in the speaker array. When the angle α between the wavefront of the
sound wave generated from the joint portion 80 and the Z axis is set to an angle other than 30
degrees, the material of the vibrating body 20 may be appropriately selected so as to be a desired
angle.
[0026]
In the embodiment described above, the magnet 30B, the yoke 40D and the yoke 40E may not be
provided. FIG. 8 is a view showing an example of a configuration in which the magnet 30B, the
yoke 40D and the yoke 40E are not provided. In this modification, the rectangular plate-like yoke
40C is supported by the support member 60B so that an air gap 70 is formed between the yoke
40C and the yoke 40A and the yoke 40B. In this configuration, the direction of the magnetic field
is from the yoke 40A to the yoke 40C between the yoke 40A and the yoke 40C, and the direction
of the magnetic field is from the yoke 40C to the yoke 40B between the yoke 40B and the yoke
40E. It becomes a direction. That is, since the direction of the magnetic field is the same as that
of the above-described embodiment, the vibrator 20 can be driven as in the above-described
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embodiment. Moreover, in the embodiment described above, the conversion unit configured by
the planar coil 100 and the magnetic circuit is located on one end side in the extension direction
of the valley portion of the vibrating body 20, but in the present invention, conversion is
performed. The one end side where the portion is located is not limited to the vicinity of the end
in the extending direction of the valley of the vibrating body 20, and a position shifted to the end
from the center in the extending direction of the valley of the vibrating body 20. Also includes.
[0027]
Second Embodiment Next, a speaker 1A according to a second embodiment of the present
invention will be described with reference to FIGS. The speaker (electro-acoustic apparatus) of
this embodiment includes a vibrating body 1001, an actuator (converter) 1002 for
reciprocatingly driving the vibrating body 1001, and a support frame 1003 for supporting the
vibrating body 1001 and the actuator 1002. And an edge portion 1004 that vibratably supports
the vibrating body 1001. In the following description, the supporting portion in the present
embodiment is, for convenience of description, up and down so that the side on which the edge
portion 1004 is provided is the upper side and the side on which the actuator 1002 is provided
is the lower side. The direction is set, and the long side direction of the support frame 1003
formed in a rectangular shape as described later is the vertical direction, and the short side
direction is the horizontal direction. Further, the surface facing upward is referred to as the front
surface, and the surface facing downward is referred to as the back, and as shown, the vertical
direction may be referred to as the X direction, the lateral direction as the Y direction, and the
vertical direction as the Z direction.
[0028]
The vibrating body 1001 is formed of a rectangular synthetic resin film having elasticity, but the
material is not limited, and a material such as synthetic resin, paper, metal or the like generally
used as a diaphragm of a speaker is used. Can. The vibrating body 1001 has a surface shape in
which a pair of vertical split cylindrical surfaces 1005 are formed in parallel in the lateral
direction, and a valley portion 1006 is formed between one side portions of adjacent vertical split
cylindrical surfaces 1005. It is done. The vibrating body 1001 in the illustrated example is
constituted by a pair of curved plates 1011 curved along the longitudinally split cylindrical
surface 1005 and a connecting plate 1012 for connecting the curved plates 1011. The side
portions forming the valley portion 1006 are in a state of being joined to each other. The
connecting plate 1012 is provided at both ends of the valley portion 1006 so as to close the
entire valley portion 1006. In the vibrating body 1001, the extension direction of the valley
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portion 1006 is the vertical direction, and the direction orthogonal to this is the horizontal
direction.
[0029]
The longitudinally split cylindrical surface 1005 of the curved plate 1011 may not necessarily be
a single arc surface, but a plurality of continuous curvatures, a cross section along the
circumferential direction (lateral direction) of the longitudinally split cylindrical surface 1005
There may be employed one having a constant or continuous change in curvature such as a
parabolic shape or a spline curve, one having a square cylindrical surface, one having a plurality
of stepped portions in a step shape, etc. The circumferential direction of the longitudinally split
cylindrical surface 1005 is curved in the lateral direction, and the direction perpendicular to the
one direction (longitudinal direction of the longitudinally split cylindrical surface 1005) is linear.
Then, the pair of curved plates 1011 are arranged in parallel with their convex directions toward
the same surface side, and adjacent side portions are joined in a state in which the tangential
direction is common. The joint portion 1013 of the both curved plates 1011 is formed in, for
example, a band plate shape by bonding one side portion of the both curved plates 1011 or the
like. Then, along the joint portion 1013, a valley portion 1006 is formed between the both
curved plates 1011 in a straight line along the longitudinal direction of the vertically split
cylindrical surface 1005. Further, in order to obtain uniform reproduction sound, as shown in
FIG. 12, it is preferable to form the both curved plates 1011 in line symmetry with respect to a
common tangent line L of the joint portion 1013. However, in the present invention, the line
symmetry is not necessarily required.
[0030]
For example, a voice coil motor is used as the actuator 1002, and the voice coil motor is
configured of a voice coil 1020 provided at the joint portion 1013 of the curved plate 1011 and
a magnet mechanism 1021 fixed to the support frame 1003. In the example shown in FIGS. 9
and 10, one actuator 1002 is provided at one longitudinal end portion of the joint portion 1013
of the curved plate 1011.
[0031]
The voice coil 1020 is formed by winding a coil 1020 b around a cylindrical bobbin 1020 a, and
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the upper end and the joining portion of the voice coil 1020 are disposed such that the joining
portion 1013 of the curved plate 1011 is disposed in the diameter direction. The lower edge of
1013 is fixed via an adhesive or the like. The outer peripheral portion of the voice coil 1020 is
supported by the support frame 1003 via the damper 1022, and the voice coil 1020 can
reciprocate along the axial direction of the voice coil 1020 with respect to the support frame
1003. The damper 1022 can apply the thing of the material used for a general dynamic speaker.
[0032]
The magnet mechanism 1021 includes an annular magnet 1023, a ring-shaped outer yoke 1024
fixed to one pole of the magnet 1023, and an inner yoke 1025 fixed to the other pole. A
magnetic gap 1026 is annularly formed between the outer yoke 1024 and the inner yoke 1025
by arranging the tip of the pole portion 1025 a at the center in the outer yoke 1024, and a voice
coil is formed in the magnetic gap 1026. The end of 1020 is placed in the inserted state.
[0033]
The damper member 1050 is formed of a sponge-like synthetic resin in a cylindrical shape, and
is an example of a member that reduces vibration.
The bottom surface of the damper member 1050 is bonded to the support frame 1003. In the
damper member 1050, the upper surface and the lower edge of the joint 1013 are fixed via an
adhesive or the like so that the end of the joint 1013 of the curved plate 1011 is disposed in the
diameter direction.
[0034]
The support frame 1003 is formed of, for example, a metal material, and in the illustrated
example, a flange portion 1030 formed in a rectangular frame shape, a plurality of arm portions
1031 extending downward of the flange portion 1030, and a lower end of these arm portions
1031. The annular frame portion 1032 is provided for the number of actuators 1002. The
vibrating body 1001 is disposed in the space in the flange portion 1030 so that the valley
portion 1006 is parallel to the long side direction of the flange portion 1030, and the peripheral
portion of the vibrating body 1001, that is, the joint portion of the both curved plates 1011 The
upper end portion of the side opposite to the side 1013 is supported on the upper surface of the
flange portion 1030 via the edge portion 1004. Therefore, the edge portion 1004 is formed in a
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rectangular frame shape corresponding to the peripheral portion of the vibrating body 1001. The
edge portion 1004 can also be made of a material used for a general dynamic speaker. In the
present invention, in the present embodiment, the support portion that supports the vibrating
body 1001 so as to be able to vibrate in the depth direction (Z direction) of the valley portion
1006 is configured by the support frame 1003 and the edge portion 1004. Accordingly, the
vibrating body 1001 can vibrate not only in the both curved plates 1011 but also in the
peripheral direction of the valley portion in the depth direction (Z direction), and the whole
vibrating body 1001 is in the depth direction of the valley portion 1006 (Z direction It becomes
possible to vibrate).
[0035]
In a state where the vibrating body 1001 is attached to the support frame 1003, as shown in FIG.
12, the vertically split cylindrical surface 1005 is a line connecting the connection ends of the
curved plate 1011 and the edge portion 1004 (in the illustrated example, connection When the
boundary line H is a tangent line at the end, it curves in a direction gradually separating from the
boundary line H from the connection end toward the valley portion 1006. As described above,
the vertically split cylindrical surface 1005 is not only a single circular arc surface, but a plurality
of continuous curvatures, a section whose curvature is constant or continuous change such as a
parabolic shape or a spline curve, a corner A cylindrical surface, a stepped shape having a
plurality of stepped portions, or the like may be employed, but a convex surface having a shape
not exceeding the boundary H connecting the connection ends with the edge portion 1004 is
adopted. Is preferred.
[0036]
In addition, although it was set as the form which adhere | attaches the one side parts of both
curved boards 1011, and is formed in band plate shape, the joined part 1013 of the curved plate
1011 is shown in FIG. It is also possible to form a V-shaped or U-shaped joint 1016 in a folded
state between the two curved plates 1011 by forming the central portion in a folded state. In any
of the embodiments, it is preferable that the vertically split cylindrical surface 1005 be a convex
surface not exceeding the boundary line H connecting the connection ends with the edge portion
1004. Moreover, although it was set as the shape which has the tangent L common to both
vertical split cylindrical surfaces 1005 in the junction part 1013 in this embodiment, this tangent
does not necessarily need to correspond in a pair of vertical split cylindrical surfaces, As shown
in 14, by having the joint in the lateral direction of the vertically split cylindrical surface 1005,
the vertically split cylindrical surfaces 1005 are formed along the tangents L1 and L2 parallel to
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each other. The case shall also be included. In this case, the curved plates 1011 are preferably
formed in line symmetry about a line M passing through the center between the tangent lines L1
and L2.
[0037]
In the speaker 1A configured as described above, when a drive current according to an audio
signal flows through the voice coil 1020 of the actuator 1002 fixed to the vibrating body 1001, a
change in magnetic flux caused by the drive current and a magnetic field in the magnetic gap
1026 The driving force corresponding to the driving current acts on the voice coil 1020 to
vibrate the voice coil 1020 in a direction (axial direction of the voice coil 1020, up and down
directions indicated by arrows in FIG. 12) orthogonal to the magnetic field. Then, the vibrating
body 1001 connected to the voice coil 1020 vibrates along the depth direction of the valley
portion 1006, and the reproduced sound due to the vibration is emitted from the vertical split
cylindrical surface 1005.
[0038]
In the present embodiment, the vibrating body 1001 has elasticity, and the vibration of the
portion connected to the voice coil 1020 is transmitted to the damper member 1050 side of the
joint portion 1013 in a delayed manner. The vibration on the damper member 1050 side is
delayed in phase as compared to the portion connected to the voice coil 1020. Then, if there is a
phase difference in vibration in the longitudinal direction at the bonding portion 1013, the
traveling direction of the sound wave generated from the vibrating body 1001 is inclined to the
negative side in the X direction. The inclination angle of the traveling direction of the sound wave
can be determined from the equation 1 as in the first embodiment described above, and in the
case where the inclination angle of the traveling direction of the sound wave is a desired angle It
is sufficient to obtain Cpx at which a desired angle can be obtained, and to form the vibrating
body 1001 using a material which becomes Cpx for which the sound velocity transmitted
through the vibrating body 1001 is obtained.
[0039]
Further, in the embodiment described above, the actuator 1002 which is the conversion unit is
located on one end side in the extension direction of the valley of the vibrating body 1001, but in
the present invention, one of the conversion units is located. The end side is not limited to the
vicinity of the end in the extending direction of the valley of the vibrating body 1001, and
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includes a position shifted to the end from the center in the extending direction of the valley of
the vibrating body 1001.
[0040]
[Modifications] Although the embodiment of the present invention has been described above, the
present invention is not limited to the above-described embodiment, and can be practiced in
various other forms.
For example, the above-described embodiment may be modified as follows to implement the
present invention. The above-described embodiment and the following modifications may be
combined with each other.
[0041]
In the first embodiment described above, the front end of the vibrating body 20 is directly
adhered and fixed to the side plate 10C and the side plate 10E, but the present invention is not
limited to this configuration. For example, the edge portion 1004 of the second embodiment is
disposed on the front end face of the housing, the front end of the vibrating body 20 is supported
by the edge portion 1004, and the front end of the vibrating body 20 is also It may be configured
to be vibratably supported in the depth direction of the valley. Further, in the vibrating body 20
according to the first embodiment, as shown in FIG. 15, the damping member 110 for damping
the vibration of the vibrating body 20 is attached to the side opposite to the side where the
planar coil 100 is located in the vertical direction. You may Further, also in the vibrating body
1001 of the second embodiment, the braking member 110 may be attached to the side opposite
to the side driven by the actuator 1002 in the vertical direction, as shown in FIG. According to
these modifications, the vibration transmitted through the vibrating body is suppressed on the
side of the end of the vibrating body, and the vibration reflected from the end can be suppressed.
[0042]
In the first embodiment described above, the speaker is configured to have one vibrating body,
but is not limited to this configuration, and may be configured to have a plurality of vibrating
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15
bodies. For example, as shown in FIG. 16, two vibrators 20-1 and 20-2 may be vertically
arranged as an example of a plurality of vibrators. In the configuration shown in FIG. 16, in each
of the vibrators, the planar coil 100 is positioned on the upper side, and a magnetic circuit is
provided corresponding to each vibrator. Further, in this configuration, the signal processing
circuit delays the audio signal supplied to the lower vibrating body 20-2 than the audio signal
supplied to the upper vibrating body 20-1. The delay time is determined based on the speed of
sound velocity transmitted through the vibrating body and the length of the vibrating body in the
vertical direction, and the delay time is Δt, and the length of the vibrating body 20-1 in the
vertical direction is L. , Δt = −L / Cpx.
[0043]
Also in the configuration of the second embodiment, as shown in FIG. 17, the vibrating bodies
1001A and 1001B may be arranged in the vertical direction as an example of the plurality of
vibrating bodies. In this configuration, an actuator 1002 is provided for each vibrator. The voice
coil 1020 of the actuator 1002 for driving the vibrating body 1001A is fixed to the right end of
the joint portion 1013 of the vibrating body 1001A as shown by a broken line in FIG. 17, and the
voice coil 1020 of the actuator 1002 for driving the vibrating body 1001B is As shown by a
broken line in FIG. 17, it is fixed to the right end of the joint portion 1013 of the vibrating body
1001B. In this configuration, the signal processing circuit delays the audio signal supplied to the
vibrating body 1001A from the audio signal supplied to the vibrating body 1001B. In addition, in
the structure provided with multiple vibrators, the number of vibrators is not limited to two, and
three or more vibrators may be provided.
[0044]
In the first embodiment described above, the magnetic circuit and the planar coil 100 are used as
the conversion unit for driving the vibrator, and in the second embodiment, a voice coil motor is
used as the conversion unit for driving the vibrator. However, instead of these conversion units, a
conversion unit using a piezoelectric element, an electrostatic conversion unit, a magnetostrictive
conversion unit, or the like may be used.
[0045]
In the first embodiment described above, the magnetic circuit and the coil 100 are disposed on
one end side in the extending direction of the valley portion of the vibrating body 20, but the
present invention is not limited to this configuration.
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16
For example, the magnetic circuit is disposed at the same position as the first embodiment, and
the length of the coil 100 in the vertical direction is longer than that of the coil of the first
embodiment, and the coil 100 is disposed from one end to the other It may be. Further, the
configuration of the diaphragm 20A and the coil 100 may be the same as that of the first
embodiment, and the length in the vertical direction of the magnetic circuit may be equal to the
length in the vertical direction of the vibrator 20.
[0046]
The embodiments described above are all speakers that emit sound, but the configurations of the
embodiments and the modifications described above can also be applied to a microphone that is
an electro-acoustic transducer. When the present invention is applied to a speaker, a conversion
unit such as a planar coil or a voice coil motor converts an electrical signal based on an audio
signal into the vibration of a vibrating body, but the conversion unit is also applied to a
microphone A planar coil, a voice coil motor or the like can be used. The converter in that case
converts the vibration of the vibrating body that vibrates upon receiving the sound wave into an
electrical signal. Then, in the microphone to which the present invention is applied, the vertically
split cylindrical surface is a vibrating surface, and the entire vibrating body vibrates to collect
sound.
[0047]
1, 1A: Speaker, 20: Vibrator, 20A, 20B: Diaphragm, 30A, 30B: Magnet, 40A to 40E: Yoke, 60A,
60B: Support member, 70: Air gap, 80: Joint portion, 100: Plane Coil, 1001: Vibrating body,
1002: Actuator (converter), 1003: Support frame, 1004: Edge portion, 1005: Vertical split
cylindrical surface, 1006: Valley portion, 1011: Curved plate, 1013: Joint portion, 1016: 1016
Junction, 1020: voice coil, 1020a: bobbin, 1020b: coil, 1021: magnet mechanism, 1022: damper,
1023: magnet, 1024: outer yoke, 1025: inner yoke, 1025a: pole portion, 1026: magnetic gap,
1030 ... Flange part, 1031 ... Arm part, 1032 ... Annular frame part, 1035 Support portion, 1050
... damper member
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