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JP2009164694

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DESCRIPTION JP2009164694
An object of the present invention is to provide a thin speaker in which a reduction in sound
pressure is suppressed. A speaker includes a first diaphragm, a magnetic circuit having an
annular first magnetic gap for vibrating the first diaphragm, and an annular first voice coil
inserted in the first magnetic gap. Prepare. The magnetic circuit is superimposed on the plate
disposed inside the first voice coil, the first magnet stacked on the plate, and the first magnet,
and by surrounding the periphery of the first voice coil, the first voice And a yoke having a gap
between the coil and the first magnet as a first magnetic gap. A second magnetic gap, which is an
annular groove, is formed at the front of the yoke, and a second magnet repulsive to the first
magnet is stacked so as to be contained within the circumference of the second magnetic gap. An
annular second voice coil joined to the back surface of the second diaphragm is inserted into the
second magnetic gap, and the second magnet is accommodated in the second diaphragm.
[Selected figure] Figure 2
スピーカ
[0001]
The present invention relates to a speaker.
[0002]
Conventionally, the speaker was provided with a magnetic circuit on the back side of the sound
reflection surface of the diaphragm. However, in order to reduce the thickness of the entire
speaker, a speaker type in which the magnetic circuit is provided on the front of the diaphragm A
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speaker called "Speaker" has been developed.
In addition, in such a speaker type speaker, by mounting another magnetic circuit and the
diaphragm on the magnetic circuit provided on the front surface of the diaphragm, the vibration
of the bass speaker in front of the bass speaker There has also been developed a coaxial 2 WAY
speaker in which a high-pitched speaker is disposed coaxially with a plate (see, for example,
Patent Document 1). Specifically, as shown in FIG. 5, the conventional 2 WAY speaker 100 is
provided with a bass speaker 110 and a treble speaker 120. In the bass speaker 110, the bass
diaphragm 112 held around the frame 111, the bass voice coil 113 extending forward from the
center of the bass diaphragm 112, and the tip of the bass voice coil 113 And a bass magnetic
circuit 114 for driving the bass voice coil 113. The bass magnetic circuit 114 has a configuration
in which the yoke 115, the magnet 116, and the plate 117 are stacked and integrated. The yoke
115 is formed in a cylindrical shape, and a part of its side surface extends outward. An annular
magnet 116 and an annular plate 117 are attached to the inner surface of the extension 118. At
this time, a predetermined gap is formed between the magnet 116 and the inner circumferential
surface of the plate 117 and the yoke 115. Thus, the tip of the low-pitched voice coil 113 is
inserted into the magnetic gap 119 formed between the plate 117 and the yoke 115. When a
music signal is applied to the bass voice coil 113, the bass voice coil 113 slides up and down by
the magnetic flux of the bass magnetic circuit 114, and the bass vibration is joined to the bass
voice coil 113. The plate 112 is vibrated and emits sound.
[0003]
On the other hand, the high-tone speaker 120 is provided with a high-tone magnetic circuit 121
and a high-tone diaphragm 122. The high-pitched magnetic circuit 121 is provided with a
magnet 123 attached to the outer surface of the extension portion 118 of the yoke 115 in the
bass magnetic circuit 114 and a plate 124. Also in this case, similarly to the bass magnetic circuit
114, the magnet 123 and the inner peripheral surface of the plate 124 and the yoke 115 are
attached so as to form a predetermined gap. The high sound diaphragm 122 is formed in a dome
shape, and the peripheral portion thereof is a high sound voice coil 126 disposed in the magnetic
gap 125 between the yoke 115 and the plate 124. When a music signal is applied to the hightone voice coil 126, the high-tone voice coil 126 slides up and down by the magnetic flux of the
high-tone magnetic circuit 121, and the high-tone vibration is joined to the high-tone voice coil
126. The plate 122 is vibrated and emits sound. JP 2003-299192 A
[0004]
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By the way, although thinning is required for the speaker as well as other electronic devices, for
the speaker, it is desired to achieve thinning while suppressing a decrease in sound pressure.
Therefore, an object of the present invention is to provide a thin speaker in which the sound
pressure drop is suppressed.
[0005]
The speaker in the invention according to claim 1 is provided with: a first diaphragm; and a
magnetic circuit which is disposed in front of the first diaphragm and has an annular first
magnetic gap for vibrating the first diaphragm at the rear. And an annular first voice coil joined
to the front surface of the first diaphragm and inserted into the first magnetic gap, wherein the
magnetic circuit is a plate disposed inside the first voice coil. A first magnet stacked on the front
surface of the plate inside the first voice coil, and a first magnet stacked on the front surface of
the first magnet and surrounding the periphery of the first voice coil; And a metal yoke having a
gap between the coil and the first magnet as the first magnetic gap, and a second magnetic gap,
which is an annular groove, is formed at the front of the yoke. In addition, a second magnet in
which the direction of the magnetic pole is opposite to that of the first magnet is overlapped so
as to be contained within the circumference of the second magnetic gap, and the second
diaphragm is placed in the second magnetic gap. The ring-shaped second voice coil joined to the
back surface of the is inserted, and the second magnet is accommodated in the second
diaphragm.
[0006]
According to a second aspect of the present invention, in the speaker according to the first
aspect, the junction portion is located outside the junction of the yoke with the first magnet and
outside the second magnetic gap. An annular notch is formed so as to surround the
[0007]
The invention according to claim 3 is the speaker according to claim 2, wherein the notch
portion is formed such that the tip end surface of the notch portion is located forward of the
bottom surface of the second magnetic gap. It is characterized.
[0008]
The invention according to claim 4 is characterized in that, in the speaker according to any one
of claims 1 to 3, the depths of at least one portion and the other portion of the second magnetic
gap are different.
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[0009]
According to the present invention, the main magnet is joined to the yoke, and the first magnetic
gap is formed by surrounding the periphery of the first voice coil in a state where the yoke is
spaced from the main magnet. The first magnetic flux emitted from the side surface of the main
magnet passes through the first voice coil from the first magnetic gap to reach the yoke.
[0010]
In addition, since a second magnetic gap in which a second voice coil is inserted is formed at the
front of the yoke, the second magnetic flux emitted from the main magnet enters the yoke and
the second magnetic gap Through the second voice coil to reach the yoke again.
Here, since the cross section of a part of the yoke is narrower than the other cross sections by
the annular groove, the part functions as a magnetic resistance portion.
As a result, the second magnetic flux passing through the yoke passes through the second
magnetic cap having a smaller resistance than the magnetic resistance portion.
[0011]
Here, although the high sound pressure can not be obtained only by the induction of the second
magnetic flux to the second magnetic gap by the magnetoresistive portion, the present invention
further further falls within the circumference of the second magnetic gap at the front of the yoke.
Since the sub magnet that repels the main magnet is disposed, the second magnetic flux is
attracted by this sub magnet, and it becomes easy to pass through the second magnetic gap.
As a result, the driving force of the second voice coil can be sufficiently obtained, and a high
sound pressure can be obtained.
[0012]
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The sub-magnet is only for guiding the second magnetic flux into the second magnetic gap, and
further, because it is housed inside the second diaphragm, the high-pitched sound like the
conventional one, the bass The entire speaker can be thinned even compared to a speaker that
requires each magnetic circuit for each.
From the above, it is possible to provide a thin speaker in which the sound pressure drop is
suppressed.
[0013]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
FIG. 1 is a cross-sectional view showing a schematic configuration of the speaker according to
the present embodiment, and FIG. 2 is an enlarged view showing the inside of an alternate long
and short dash line in FIG. As shown in FIGS. 1 and 2, in the speaker 1, a frame 2, a bass
diaphragm (first diaphragm) 3 supported by the frame 2, and a protrusion 21 provided at the
center of the bottom of the frame 2. The magnetic circuit 9 supported by the magnetic circuit 9
and the high-tone diaphragm (second diaphragm) 4 provided in the magnetic circuit 9 are
provided. For convenience of explanation, as shown in FIG. 1, the upper part of the drawing is
referred to as front in the main speaker 1, and the lower part in FIG.
[0014]
The frame 2 covers the back side of the bass diaphragm 3 and supports the bass diaphragm 3. A
protrusion 21 projecting forward is formed at the central portion of the frame 2, and a plate 8
constituting a magnetic circuit 9 at its tip, a main magnet (first magnet) 5, and a yoke 6 are
provided. It is locked by a screw 7.
[0015]
The low frequency diaphragm 3 is formed in a substantially conical shape so as to be recessed
rearward, and a through hole 31 through which the protrusion 21 of the frame 2 penetrates is
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formed at the center thereof. An annular bass voice coil (first voice coil) 32 extending forward
from the front surface is joined to the periphery of the through hole 31 on the front surface of
the bass diaphragm 3.
[0016]
The high-tone diaphragm 4 is formed in a dome shape so as to be convex toward the front, and
an annular high-tone voice coil (second The voice coil 41 is joined.
[0017]
The plate 8 is formed of metal in a cylindrical shape, and a through hole 81 through which the
screw 7 passes is formed at the central portion thereof.
The plate 8 is disposed between the bass diaphragm 3 and the treble diaphragm 4 and inside the
bass voice coil 32.
[0018]
The main magnet 5 is formed in a cylindrical shape, and a through hole 51 through which the
screw 7 passes is formed at the central portion thereof. The main magnet 5 is superimposed on
the front surface of the plate 8 so as to be disposed between the bass diaphragm 3 and the treble
diaphragm 4 and inside the bass voice coil 32. Here, the main magnet 5 is disposed such that the
S pole is in the front and the N pole is in the rear. In addition, the outer periphery of the main
magnet 5 is set to be larger than the periphery of the high sound magnetic gap described later.
[0019]
The yoke 6 is made of metal, is superimposed on the front surface of the main magnet 5, and is
disposed between the main magnet 5 and the high-tone diaphragm 4 so as to surround the
periphery of the bass voice coil 32. The yoke 6 is integrally provided with a main body 61 to
which the main magnet 5 is joined on the rear surface, and an extension 62 extending rearward
from the peripheral edge of the main body 61.
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[0020]
The extension portion 62 surrounds the periphery of the bass voice coil 32 in a state where a
gap 66 is formed with respect to the side surface of the main magnet 5. As a result, the lowpitched voice coil 32 is disposed in the gap 66, and the gap 66 acts as a low-pitched magnetic
gap (first magnetic gap).
[0021]
On the rear surface of the main body portion 61, a protrusion 63 which is convex toward the
rear and a screw hole 65 in which a screw 7 is screwed at the center of the protrusion 63 are
formed. The protrusion 63 is formed in a circular shape, and the outer diameter thereof is set
smaller than the outer diameter of the main magnet 5.
[0022]
An annular groove 64 into which the tip of the high-tone voice coil 41 is inserted is formed on
the front surface of the main body 61. Thus, since the high-tone voice coil 41 is inserted into the
annular groove 64, the annular groove 64 acts as a high-tone magnetic gap (second magnetic
gap). As a result, the junction between the main portion 61 of the yoke 6 and the main magnet 5
falls within the circumference of the annular groove 64.
[0023]
FIG. 3 is a front view of the yoke 6 showing the outer shape of the annular groove 64. As shown
in FIG. The annular grooves 64 are radially divided into six, and alternately have different depths.
Specifically, in FIG. 3, the depth of the black portion B is set deeper than the white portion W.
[0024]
A circular recess 61 a is formed in the circumference of the annular groove 64 on the front
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surface of the main body 61. As shown in FIG. 1 and FIG. 2, when the disc-shaped sub magnet
(second magnet) 10 is fitted in the recess 61 a, the sub magnet 10 is accommodated in the hightone diaphragm 4. Become. The sub magnet 10 is fitted in the recess 61 a so that the south pole
is backward and the north pole is forward, that is, the direction of the magnetic pole is opposite
to that of the main magnet 5. It becomes the relationship which repels with the magnet 5.
[0025]
In addition, an annular notch 11 is formed at a position outside the joint with the main magnet 5
on the rear surface of the main body 61 and outside the annular groove 64 so as to surround the
joint. . The notch portion 11 is formed such that the tip end surface 11 a of the notch portion 11
is located forward of the bottom surface 64 a of the annular groove 64.
[0026]
FIG. 4 is a cross-sectional perspective view showing the flow of magnetic flux in the plate 8, the
main magnet 5, the sub magnet 10, and the yoke 6. Arrows in the figure indicate the flow of
magnetic flux. As shown in FIG. 4, since the cross section of a part of the main body 61 of the
yoke 6 is narrower than the cross section of the other part due to the annular groove 64, the part
functions as the magnetoresistive part 68. In addition, the magnetic flux for high sound (arrow Q)
is also induced to the magnetic gap for high sound (annular groove 64) by the notch portion 11.
As a result, the high-pitched magnetic flux (arrow Q) passing through the inside of the main body
portion 61 of the yoke 6 passes through the high-pitched magnetic cap having a resistance
smaller than that of the magnetic resistance portion 68. Furthermore, since the magnetic flux for
high frequency sound is attracted by the sub magnet 10 which repels to the main magnet 5, the
magnetic flux for high frequency sound is easy to pass through the magnetic gap for high
frequency sound. The inner diameter of the annular groove 64 is set to be larger than the outer
diameter of the projection 63 in order to flow the magnetic flux efficiently to the high sound
magnetic gap. The optimum value of the depth of the annular groove 64 is determined by the
size, the output, and the like of the speaker 1, but this value is determined by various simulations,
experiments, and the like.
[0027]
Next, the operation of the present embodiment will be described. The low frequency magnetic
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flux emitted from the side surface of the main magnet 5 passes through the low frequency voice
coil 32 from the low frequency magnetic gap (the gap 66) and reaches the extension portion 62
of the yoke 6. Here, when the voice signal is input to the low-pitched voice coil 32, the lowpitched voice coil 32 reacts with the magnetic force and vibrates back and forth. Since the bass
voice coil 32 is connected to the bass diaphragm 3, the vibration of the bass voice coil 32 is
transmitted to the bass diaphragm 3. Thereby, sound wave radiation is performed from the low
frequency diaphragm 3. On the other hand, the high-pitched magnetic flux emitted from the main
magnet 5 enters the yoke 6 and passes through the high-pitched voice coil 41 from the highpitched magnetic gap (annular groove 64) while avoiding the magnetic resistance portion 68
again. It will reach York 6. Here, when the voice signal is input to the high-tone voice coil 41, the
high-tone voice coil 41 reacts with the magnetic force and vibrates back and forth. Since the
high-tone voice coil 41 is connected to the high-tone diaphragm 4, the vibration of the high-tone
voice coil 41 is transmitted to the low-tone diaphragm 4. Thereby, sound wave radiation is
performed from the high-tone diaphragm 4.
[0028]
As described above, according to the present embodiment, the sub magnet 10 that repels the
main magnet 5 is disposed within the circumference of the annular groove 64 in the front
portion of the yoke 6. The magnetic flux is attracted and easily passes through the high noise
magnetic gap. As a result, the driving force of the high-tone voice coil 41 can be sufficiently
obtained, and a high sound pressure can be obtained.
[0029]
The sub magnet 10 is merely for guiding the magnetic flux for high sound into the magnetic gap
for high sound, and further, because it is housed inside the high sound diaphragm 4, it is for the
high sound as in the prior art. The entire speaker can be thinned even compared to a speaker
that requires each magnetic circuit for bass. From the above, it is possible to provide a thin
speaker in which the sound pressure drop is suppressed.
[0030]
In addition, since the annular notch 11 is formed so as to surround the junction at a position
outside the junction with the main magnet 5 in the yoke 6 and outside the magnetic gap for high
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sound, The notch 11 is an obstacle to the magnetic flux path to the magnetic resistance portion
68. As a result, the magnetic flux passing through the inside of the yoke 6 easily passes through
the high-tone magnetic gap.
[0031]
Furthermore, since the end face 11a of the notch 11 is positioned forward of the bottom surface
64a of the high-noise magnetic gap, the notch 11 covers the sides of the magnetic resistance
portion 68, and the magnetic resistance portion 68 The magnetic flux for high-pitched sound
becomes harder to flow.
[0032]
In addition, since the high-pitched magnetic gaps have different depths between at least one
portion and the other portions, the thickness of the magnetic resistance portion 68 also varies
depending on the location.
For this reason, the resistance of the magnetic resistance portion 68 also increases, and the
magnetic flux for high-pitched sound can more easily pass through the high-pitched magnetic
gap. Further, in the present embodiment, although the magnetic gap for high sound (annular
groove 64) is divided into six so as to be alternately different in depth, it is not limited to this.
Here, the depth of the annular groove 64 is partially increased to reduce the magnetic
conduction portion and increase the magnetic resistance portion, thereby promoting the flow of
the magnetic force to the high sound magnetic gap, and as a result, a high magnetic flux is
obtained. It becomes possible. Therefore, it is also possible to increase the number of magnetic
resistance parts by providing a plurality of through holes in the annular groove 64, for example,
other than the above embodiment.
[0033]
Further, since the junction between the main portion 61 of the yoke 6 and the main magnet 5 is
contained within the circumference of the high-noise magnetic gap which is the annular groove
64, the magnetic flux emitted from the main magnet 5 and passing through the junction is , It
becomes easy to enter into the magnetic gap for high sound, and it is possible to improve the
sound output efficiency.
[0034]
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And since the protrusion 63 of the yoke 6 is set on the outer periphery smaller than the
circumference of the high noise magnetic gap and the protrusion 63 and the main magnet 5 are
joined, the main magnet 5 is made of the high noise magnetic gap. Even when the outer
circumference is larger than the circumference, the junction between the yoke 6 and the main
magnet 5 is within the circumference of the high-noise magnetic gap.
As a result, it is possible to make the size of the main magnet 5 larger than the magnetic gap for
high sound while making it easy for the magnetic flux to enter the magnetic gap for high sound.
Therefore, the magnetic force of the magnetic circuit 9 can be further maintained, and the sound
pressure can be easily maintained.
[0035]
Of course, the present invention is not limited to the above embodiment, but can be appropriately
modified. For example, in the present embodiment, the case where three black portions B of the
six-divided annular grooves 62 are formed deeper than the other white portions W is illustrated,
but penetration is possible if the depths are different. It may be Moreover, the deep part is not
limited to three if it is at least one part.
[0036]
It is a sectional view showing a schematic structure of a speaker concerning this embodiment. It
is an enlarged view which shows the inside of the dashed-dotted line part of FIG. It is a front view
of the yoke which shows the external shape of the annular groove with which the speaker of FIG.
1 is equipped. It is a cross-sectional perspective view which shows the flow of the magnetic flux
in the plate concerning this embodiment, a magnet, and a yoke. It is sectional drawing which
shows schematic structure of the conventional speaker.
Explanation of sign
[0037]
Reference Signs List 1 speaker 2 frame 3 diaphragm for low frequency sound (first diaphragm) 4
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diaphragm for high sound (second diaphragm) 5 main magnet (first magnet) 6 yoke 7 screw 8
plate 9 magnetic circuit 10 sub magnet (second magnet 11 Notched part 11a Tip surface 21
Protrusion 31 Through hole 32 Voice coil for low tone (1st voice coil) 41 Voice coil for highpitched sound (2nd voice coil) 51 Through hole 61 Body part 62 Extension part 63 Projection 64
annular groove (Second magnetic gap) 64a bottom surface 65 screw hole 66 gap (first magnetic
gap)
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