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JP2005197998

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DESCRIPTION JP2005197998
PROBLEM TO BE SOLVED: To provide a driver for a speaker diaphragm capable of increasing the
amount of vibration of a diaphragm with respect to the amount of movement of a voice coil
without increasing the thickness in the radiation direction of sound and a speaker using the
driver. . SOLUTION: An arc-shaped drive main body 10 is formed of an elastic material, and the
drive main body 10, a magnetic circuit 16 including a yoke, a magnet, and a plate, and a voice
coil 18 and a damper disposed around the magnetic circuit 16. A speaker 11 is composed of a
drive unit X, a frame 20 to which the drive unit X is attached, and a diaphragm 21 fixed to the
frame 20, and the drive main body 10 is one of them The end and the bobbin 19 are connected,
and the central portion of the diaphragm 21 is fixed to the upper surface of the central portion.
[Selected figure] Figure 3
Driver for speaker diaphragm and speaker using the driver
[0001]
The present invention relates to a driver for a speaker diaphragm used in various types of audio
equipment, and a speaker using the driver, more specifically, without increasing the thickness in
the sound radiation direction. The present invention relates to a driver of a speaker diaphragm
which can increase the amount of vibration of a diaphragm with respect to the amount of
movement of a voice coil, and a speaker using the driver.
[0002]
As shown in FIG. 5, the conventional speaker 1 has a magnetic circuit 5 comprising a yoke 2
having a pole at the center of the upper surface, a magnet 3 and a plate 4, a voice coil 6 provided
around the magnetic circuit 5, and a diaphragm 7. And a frame 9 fixed to the magnetic circuit 5
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and assembled so as to stack from the magnetic circuit 5 to the cone paper which is the
diaphragm 7 in the sound radiation direction Is the same as the driving direction of the voice coil
6, and the diaphragm 7 is directly driven by the voice coil 6.
[0003]
Therefore, while eliminating the need for a fixed structure in which the drive unit and the
diaphragm are in close proximity, the signal transmission path leading to the sound generation is
made less susceptible to external shocks, and the degree of freedom in structure and installation
A speaker that can be improved and that can ensure more appropriate sounding operation,
application to various applications, and the like is proposed in Japanese Patent Laid-Open No.
2000-350285 (Patent Document 1).
[0004]
The speaker described in Patent Document 1 supports a diaphragm, a drive unit generating a
force according to the sound to be generated, and the diaphragm supported in a state of internal
stress and a force generated by the drive unit. And transmitting the wave generated by the
vibration to the diaphragm. Specifically, the paper is elastically deformed to a state in which the
internal stress exists, and is supported at two points by the tip of the support member and the
clamping portion, One end of the support column is connected to the clamping portion, and the
other end is connected to a predetermined portion of the speaker drive portion in the drive
portion box.
[0005]
Then, at the predetermined portion, a disk receiving a force by the voice coil is provided in a
state in which the vibration is suppressed, an electric signal is supplied to the voice coil to
generate a force on the disk, and a wave generated thereby is supported It is transmitted to the
paper through the clamping portion and the support member, and is converted into mechanical
vibration by the paper to emit a sound.
Unexamined-Japanese-Patent 2000-350285 (Claims, FIG. 1)
[0006]
In the loudspeaker described in Patent Document 1, the diaphragm is supported in a state of
internal stress, and “waves” generated by the force generated by the drive unit are transmitted
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to the diaphragm, so that it is intended to generate Sound is transmitted in the form of a wave
and converted into mechanical vibration by the diaphragm, so the drive part and the diaphragm
do not need to be close to each other and can be configured in a free form. The effect of being
able to improve the freedom degree of a structure and installation is acquired.
[0007]
However, since the drive unit and the diaphragm are connected by the support column, it is
necessary to design the speaker taking into consideration the weight of the drive unit constantly,
and the speaker can be miniaturized and / or thinned. There are various issues to be solved in
[0008]
That is, in the loudspeaker described in Patent Document 1, a wave is transmitted from the disk
joined to the voice coil to the narrowing portion through the thin supporting column, and elastic
deformation is caused between the tip of the supporting column and the narrowing portion. Since
the paper (diaphragm) fixed and fixed is vibrated, it is a phenomenon such as so-called
resonance, so to reliably vibrate the diaphragm, the corresponding large size according to the
size of the diaphragm It is quite difficult to reduce the size and / or thickness of the speaker by
requiring a drive source.
[0009]
Further, in the speaker described in Patent Document 1, it is an essential condition to elastically
deform the paper (diaphragm), and if the internal stress is small, the effect as the diaphragm can
be exhibited. If the internal stress is increased to increase the effect as a diaphragm, the strength
of the support column supporting the paper (diaphragm) is increased to prevent the paper
(diaphragm) from returning to the state without internal stress. The necessity arises, and there is
a problem that the shapes of the paper (diaphragm) and the support columns approach a fixed
state and can not vibrate as the internal stress becomes stronger.
[0010]
On the other hand, in recent years, in the demand for speakers, it has been required to increase
the amount of vibration of the diaphragm with respect to the amount of movement of the voice
coil without increasing the thickness in the radiation direction of sound. For example, since the
amount of vibration of the diaphragm with respect to the amount of movement of the voice coil
is the same, in order to increase the amount of vibration of the diaphragm, the magnetic circuit
and the vibration system must be enlarged to increase the amount of movement of the voice coil.
As a result, since the radiation direction of the sound is the same as the driving direction of the
voice coil, it is extremely difficult to meet the requirement because the thickness in the radiation
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direction of the speaker becomes large.
[0011]
In view of such a present situation, the present invention provides a drive body for a speaker
diaphragm which can increase the amount of vibration of the diaphragm without increasing the
thickness in the radiation direction of sound, and a speaker using the drive body. It is.
[0012]
In order to achieve the above object, the driving body of the speaker diaphragm according to
claim 1 of the present invention is formed of an arc-shaped driving main body, and at least one
end thereof is used as a connecting portion with a bobbin of a voice coil. It is characterized by
being able to
[0013]
According to a second aspect of the present invention, there is provided a drive body of a
speaker diaphragm according to a second aspect of the present invention, comprising: an arcshaped drive main body; a magnetic circuit comprising a yoke, a magnet and a plate, and a voice
held in a magnetic gap of the magnetic circuit. It comprises a bobbin of a coil, and is
characterized in that one end of the drive main body and the bobbin are connected.
[0014]
The invention according to claim 3 of this invention is characterized in that, in the drive body of
the speaker diaphragm according to claim 1 or 2, the drive main body has a band shape or a rod
shape and is made of an elastic material. It is said that.
[0015]
Further, according to the invention described in claim 4 of this invention, in the drive body of the
speaker diaphragm according to any one of claims 1 to 3, the drive main body is for the speaker,
the other end not connected to the bobbin It is characterized in that it is fixed to a portion of the
frame facing the bobbin.
[0016]
The invention according to claim 5 of this invention is the drive body of the speaker diaphragm
according to any one of claims 1 to 3, wherein the drive main body is for the speaker, the other
end not connected to the bobbin It is characterized in that it is connected to a bobbin of a voice
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coil of another magnetic circuit fixed to a portion of the frame facing the bobbin.
[0017]
Furthermore, according to a sixth aspect of the present invention, there is provided a magnetic
circuit including a yoke, a magnet, and a plate, a voice coil disposed around the magnetic circuit,
a drive unit including a damper, and the drive unit. A vibrating plate fixed to the frame, and an
arc-shaped drive main body made of an elastic material, wherein one end of the drive main body
and the bobbin are connected, and A central portion of the diaphragm is fixed to the upper
surface of a central portion.
[0018]
The invention according to claim 7 of the present invention is the speaker according to claim 6,
wherein the drive main body is disposed in the diameter direction in the frame, and the drive
main body is provided on the side wall opposite to the one end. The bobbin of the voice coil
constituting the part is disposed so as to project into the side wall, the bobbin of the voice coil is
connected to one end of the voice coil, and the other end is attached to the side wall of the frame
facing the drive part. It is
[0019]
The invention according to claim 8 of this invention is the speaker according to claim 7, wherein
the drive main body has one end connected to the bobbin of the voice coil via a free joint and the
other end to a free joint. It is characterized in that it is attached to the side wall of the frame.
[0020]
The invention according to claim 9 of the present invention is the speaker according to claim 6,
wherein the drive main body is disposed in the diameter direction in the frame, and on the side
wall of the frame opposite to each end. The drive unit is disposed such that the bobbins of the
voice coils constituting the respective drive units project into the side wall, and the respective
end portions are connected to the bobbins of the respective voice coils.
[0021]
The invention according to claim 10 of the present invention is the speaker according to claim 9,
characterized in that each end of the drive main body is connected to the bobbin of the voice coil
via a free joint. It is said that.
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[0022]
The invention according to claim 11 of the present invention is the speaker according to claim 6
or 9, wherein the diaphragm is driven by a plurality of driving main bodies, and at least one end
of each driving main body is Are characterized in that they are respectively connected to the
bobbins of the voice coil of the drive unit disposed on the frame.
[0023]
The invention according to claim 12 of the present invention is the speaker according to any one
of claims 6 to 11, characterized in that the drive main body and the diaphragm are connected
and fixed by caulking. It is
[0024]
The driving body of the speaker diaphragm according to the present invention is an elastic
member formed in a bow shape and a band shape or a bar shape, at least one end is connected to
the bobbin of the voice coil and the other end is fixed or other voice coil The drive main body can
be easily and easily deformed into an arc shape by the vibration of the voice coil by connecting to
the bobbin of the voice coil, and by fixing the central part of the diaphragm to the central part of
the drive main body, the vibration of the voice coil It is possible to obtain a speaker having a
structure in which the direction and the vibration direction of the diaphragm differ by about 90
degrees.
[0025]
In particular, in the present invention, when the pressing body is applied in the axial direction
from one end of the driving main body by making the driving body into an arc shape which is
made of an elastic material and has a gentle circular arc shape as a whole, small Since the central
portion can be greatly vibrated by force, when applied to a speaker, the amount of vibration of
the diaphragm with respect to the amount of movement of the voice coil can be increased.
[0026]
Further, in the speaker according to the present invention, since the driving of the diaphragm is
performed by the driving main body whose entire end is fixed to the voice coil bobbin and has a
bow shape, the vibration direction of the voice coil and the vibration direction of the diaphragm
are about 90 degrees. The structure can be made different, which can increase the vibration
amount of the diaphragm with respect to the movement amount of the voice coil without
increasing the thickness of the speaker in the radiation direction.
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[0027]
In particular, the speaker according to the present invention can use a magnetic circuit smaller
than that of the conventional speaker, can be reduced in weight, and the diaphragm can have the
shape and size of the conventional speaker. Since sound quality similar to that of the
conventional speaker can be obtained and a small and light magnetic circuit can be used, the cost
reduction of the magnetic circuit is possible.
[0028]
In addition, when joining the diaphragm and the drive main body, or the bobbin of the voice coil
and the drive main body, the diaphragm is linearly vibrated even when the vibration is large by
using a joint, which causes a distortion of sound. It is effective to reduce rolling and so on.
[0029]
Hereinafter, to specifically describe the driving body of the speaker diaphragm of the present
invention and the embodiment of the speaker using the driving body, FIG. 1 shows an example of
the driving body of the speaker diaphragm according to the present invention. 2 is a perspective
view showing another example of the driver, FIG. 3 is a schematic explanatory view showing an
example of the speaker according to the present invention, FIG. 4 is a schematic explanatory view
showing another example of the speaker, FIG. These are explanatory drawings of the
conventional speaker.
[0030]
According to the present invention, the elastic member is formed in a bow shape to be a drive
body of the speaker diaphragm, and at least one end of the drive main body is disposed around
the magnetic circuit including a magnetic circuit including a yoke, a magnet and a plate. Of the
drive unit comprising the voice coil and the damper to be connected to the bobbin of the voice
coil to make a drive body, and to constitute various speakers using this drive body, the gist
Various changes can be made within the scope not changing, and the present invention is not
limited to the examples described later.
[0031]
The driver 10 of the speaker diaphragm according to the present invention is made of a flexible
material such as a metal material such as phosphor bronze or stainless steel, a plastic material
such as polypropylene or polyacetal, etc. alone or in combination with a material having
elasticity. The drive main body 10 is formed in a shape, that is, in an arc shape in a side view
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(note that since it is substantially the same as the drive body of the speaker diaphragm, the same
reference numeral is given.
If the drive main body 10 is flexible, the whole may be a strip as shown in FIG. 1, or the whole
may be a rod as shown in FIG. Also in the case of, the left and right lengths are the same around
the arc.
[0032]
The driving body 10 connects at least one end 10a of the driving main body 10 formed in an
arcuate shape to the top of the bobbin of the voice coil fixed to the frame, and fixes the other end
10b to the side wall of the frame. The drive body of this configuration is configured to deform
the bow shape according to the drive direction of the bobbin driven by the input of the audio
signal to the head, and to vibrate the diaphragm provided at the center of the arc of the drive
main body 10 vertically. By adopting 10, it is possible to obtain a speaker having a structure in
which the vibration direction of the voice coil and the vibration direction of the diaphragm differ
by about 90 degrees.
[0033]
Hereinafter, an embodiment of a speaker using the driving body 10 having such a configuration
will be specifically described.
[0034]
The speaker 11 shown in FIG. 3 includes the drive main body 10, a yoke 13 having a pole 12, a
ring-shaped magnet 14 disposed and fixed on the yoke 13, and a ring-shaped disposed and fixed
on the magnet 14. A magnetic circuit 16 comprising a plate 15, a voice coil 18 held by a damper
17 in a magnetic gap formed in the magnetic circuit 16, a bobbin 19 around which the voice coil
18 is wound, and the magnetic circuit 16 are mounted. And a diaphragm 21 fixed to the drive
main body 10.
[0035]
In the present invention, among the components constituting the speaker 11, the magnetic
circuit 16 and a bobbin 19 around which the voice coil 18 disposed around the magnetic circuit
16 is wound, and the bobbin 19 is held at a predetermined position The dampers 17 are
collectively referred to as a drive unit X.
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[0036]
In the speaker 11, the frame 20 is composed of a main frame 20a whose side wall extends
vertically upward and a sub-frame 20b whose diameter is increased and connected to the upper
end of the main frame 20a. The upper outer periphery of the main frame 20a The upper surface
of the plate 15 of the magnetic circuit 16 is brought into contact with the wall, and the both are
integrally fixed with an adhesive or the like.
[0037]
At this time, a through hole having substantially the same diameter as the inner diameter of the
plate 15 of the magnetic circuit 16 is formed in the upper outer peripheral wall, so the magnetic
circuit 16 is fixed to the outer side of the side wall and then the inner side of the main frame 20a.
The bobbin 19 having the voice coil 18 wound thereon is inserted into the magnetic gap, and the
damper 17 holds the voice coil 18 in the magnetic gap.
[0038]
Therefore, in the embodiment shown in FIG. 3, the bobbin 19 is held parallel to the bottom
surface 20c of the frame 20.
[0039]
In this state, the drive main body 10 is disposed in the diameter direction of the frame 20, and
one end thereof is connected and fixed to the bobbin 19 of the voice coil 18, and the other end is
on the inner peripheral wall of the main frame 20a facing the bobbin 19 The center of the
diaphragm 21 is fixed to the center of the upper surface of the drive main body 10, and the outer
peripheral portion of the diaphragm 21 is adhesively fixed to the upper end of the sub frame 22b
to form the speaker 11.
[0040]
Therefore, although not shown, when an electric signal is input to the voice coil 18 from the
input terminal through the tinsel wire, the bobbin 19 is operated toward the center of the frame
20 by the drive of the voice coil 18, and the bobbin 19 has its proximal end The fixed driving
main body 10 is simultaneously pressed in the side wall direction opposite to the side wall on
which the magnetic circuit 16 is mounted, but the other end of the driving main body 10 is fixed
to the side wall of the frame 20. It moves up and down substantially at the center of the frame 20
to drive the diaphragm 21 in the vertical direction, and sound is emitted from the diaphragm 21.
[0041]
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9
The fixing means of the driving main body 10 and the bobbin 19 of the voice coil 18 and the
inner peripheral wall of the frame 20 are not particularly limited as long as the both are surely
integrally integrated. When the bow-shaped drive main body 10 is deformed to a certain extent
with respect to the drive force of the voice coil 18, the shape of the drive main body 10 follows
while bending like a distribution curve of statistics, and the bobbin 19 and the drive main body
Although the angle change of the end of 10 and the connecting part is small, as the strength of
the drive main body 10 becomes high, the drive main body 10 comes to exert a strong force in
the driving direction of the voice coil 18, Cause distortion.
[0042]
Therefore, in order to suppress the force, the joint 22 is attached to the connecting portion
between the driving main body 10 and the bobbin 19 and the connecting portion between the
driving main body 10 and the inner peripheral wall of the frame 20, and the connecting portion
is free in the lateral direction. It will be necessary to
The use of the joint 22 is also effective to increase the strength of the drive main body 10 when
the input increases and the number of amplitudes also increases.
[0043]
Further, the joint 22 can be used at the connecting portion between the drive main body 10 and
the diaphragm 21 to change the angle of the connecting portion between the two, and by
adopting such a configuration, the diaphragm 21 becomes a voice coil 18. It moves more linearly
in the direction of 90 degrees with respect to the direction of movement, and is very effective
when the amount of drive is large.
[0044]
Even when the joint 22 is not used, when the amount of amplitude is small, the arc-like motion is
close to a linear motion.
[0045]
Further, in the present invention, since the central portion of the diaphragm 21 can be fixed to
the central portion of the upper surface of the arc-shaped drive main body 10 and used, it is
possible to use the center of the conical diaphragm as in the conventional diaphragm. Since it is
not necessary to cut the vicinity of the part horizontally to form a frusto-conical shape,
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manufacturing of the diaphragm can be facilitated and cost can be reduced.
[0046]
Furthermore, in the embodiment shown in FIG. 3, the arc-shaped drive main body 10 is disposed
with the arc-shaped top facing upward, but is arranged with the arc-shaped apex facing
downward and at the center of the upper surface of the recess. The central portion of the
diaphragm 21 may be fixed.
[0047]
FIG. 4 shows an example of another speaker using the driving body of the present invention.
While the speaker 11 in the first embodiment drives the driving main body 10 by one driving
portion X, two driving portions are used. The drive main body 10 is driven by the X and the drive
unit X1.
The same parts as in Example 1 are indicated by the same reference numerals.
[0048]
That is, both the drive unit X and the drive unit X1 have the same size, and the drive unit X1 is
provided on the side wall of the main frame 20a facing the mounting portion of the drive unit X
in the first embodiment.
[0049]
The drive unit X1 includes a magnetic circuit 16a including the drive body 10a as shown, a yoke
13a having a center pole 12a at the center of the upper surface, a ring magnet 14a and a ring
plate 15a, and the magnetic circuit A voice coil 18a held by a damper 17a in a magnetic gap
formed in 16a and a bobbin 19a around which the voice coil 18a is wound.
[0050]
The respective ends of the drive main body 10 are connected and fixed to the tops of the bobbins
19 and 19a of the drive portion X and the drive portion X1 at the relative positions via the joints
22 respectively, and the center of the diaphragm 21 at the center of the upper surface The parts
are fixed to form the speaker 31.
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[0051]
In the speaker 31 having such a configuration, when an electric signal is input to the voice coil
18, 18a provided to the drive unit X and the drive unit X1, the bobbin 19 of the drive unit X is on
the right in the drawing and the bobbin 19a of the drive unit X1 is on the left When the tops of
the bobbins 19 and 19a move closer to each other and the bobbins 19 of the drive unit X move
to the left in the drawing, the bobbins 19a of the drive unit X1 move to the right, and the bobbins
19 and 19a The distance of the top will be away.
[0052]
Therefore, by operating the voice coil in this manner, the drive main body 10 can be operated in
a direction different by about 90 degrees with respect to the lateral movement direction of the
bobbin, that is, in the vertical direction, thereby driving the diaphragm 21. is there.
[0053]
Since the speaker 31 of this type applies pressing forces in opposite directions to each end of one
driving main body 10, the driving main body 10 is halved compared to the type of the first
example. Of the magnetic circuit can be further miniaturized, and if the same magnetic circuit is
used, the vibration plate 21 can be operated more stably by doubling it by one. It can be done.
[0054]
In the second embodiment, the two driving units X and X1 are disposed at the opposing portions
of the main frame 20a. For example, the driving units X may be arranged at three angles of 120
degrees or at an angle of 90 degrees. It is also possible to install four diaphragms at equal
intervals and vibrate one diaphragm 21 by a plurality of drive main bodies 10, 10,... To increase
the operating force.
[0055]
As described above, the drive body of the speaker diaphragm of the present invention forms an
elastic member in an arc shape to form a drive main body, and makes at least one end of the
drive main body interlock with the voice coil to vibrate. The plate is driven, and by forming the
speaker using the driving body of the speaker diaphragm, the amount of vibration of the
diaphragm can be increased without increasing the thickness in the radiation direction of the
sound. By appropriately selecting the size of the driving body and the material and size of the
diaphragm to be used, there is an advantage that downsizing and thinning can be achieved.
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[0056]
It is a perspective view which shows an example of the drive body of the speaker diaphragm
concerning this invention.
It is a perspective view which shows the other example of the drive body.
It is a schematic explanatory drawing which shows an example of the speaker concerning this
invention.
It is a schematic explanatory drawing which shows the other example of the speaker concerning
this invention.
It is a schematic explanatory drawing of the conventional speaker.
Explanation of sign
[0057]
DESCRIPTION OF SYMBOLS 10 drive body (drive main body) 11 speaker 13 yoke 14 magnet 15
plate 16 magnetic circuit 17 damper 18 voice coil 19 bobbin 20 frame 21 diaphragm X drive
part
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