JP2009100292

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DESCRIPTION JP2009100292
An object of the present invention is to reduce the number of parts and the number of
assembling steps while realizing a reduction in thickness by making it possible to share magnets
for low and high tones. The speaker is joined to a first diaphragm, a magnetic circuit having an
annular first magnetic gap for vibrating the first diaphragm at the rear, and a front surface of the
first diaphragm, An annular first voice coil inserted into one magnetic gap is provided. The
magnetic circuit is overlapped with the plate disposed inside the first voice coil, the magnet
placed inside the first voice coil on the front surface of the plate, and the front surface of the
magnet and surrounding the periphery of the first voice coil And a metal yoke having a gap with
the magnet as a first magnetic gap. A second magnetic gap, which is an annular groove, is formed
at the front of the yoke. By inserting an annular second voice coil joined to the back surface of
the second diaphragm into the second magnetic gap, one magnetic circuit drives two
diaphragms. [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, as in the case of other electronic devices, the speaker is required to be thinner and to
reduce the number of parts and the number of assembling steps. Therefore, it is an object of the
present invention to realize a reduction in the thickness of the speaker and to reduce the number
of parts and the number of assembling steps by enabling the magnets provided for the low
frequency magnetic circuit and the high frequency magnetic circuit to be common. It is.
[0005]
The speaker in the invention according to claim 1 is a magnetic circuit having a first diaphragm,
and an annular first magnetic gap disposed in front of the first diaphragm and 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 magnet superimposed on the front of the plate inside the
first voice coil, and a magnet on the front of the magnet and surrounding the periphery of the
first voice coil via the first voice coil And a metal yoke having a gap with the magnet as the first
magnetic gap, and a second magnetic gap, which is an annular groove, is formed in a front
portion of the yoke, and the second magnetic By inserting an annular second voice coil joined to
the back surface of the second diaphragm in the cap, one of the magnetic circuits drives the first
diaphragm and the second diaphragm. There is.
[0006]
The invention according to claim 2 is characterized in that, in the speaker according to claim 1,
the junction between the yoke and the magnet is contained within the circumference of the
second magnetic gap which is the annular groove.
[0007]
According to a third aspect of the present invention, in the speaker according to the second
aspect, the magnet has an outer periphery larger than a circumference of the second magnetic
gap, and in the yoke, the junction portion is the second magnetic. It is characterized in that a
projection smaller than the circumference is formed so as to be within the circumference of the
gap.
[0008]
According to the present invention, the 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 has a gap
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with respect to the magnet. The first magnetic flux emitted from the side of the first magnetic
coil passes from the first magnetic gap to the first voice coil to reach the yoke.
In addition, since the second magnetic gap in which the second voice coil is inserted is formed at
the front of the yoke, the second magnetic flux emitted from the front surface of the magnet (the
joint surface with the yoke) It enters and passes through the second voice coil from the second
magnetic gap 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.
[0009]
As described above, while magnets for high and low tones are conventionally required in the
prior art, according to the present invention, one magnet can be commonly used for high and low
tones. As a result, the number of magnets installed can be reduced, and thinning of the entire
speaker can be realized. In addition, the number of assembling steps can be reduced accordingly.
[0010]
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.
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[0011]
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 center of the frame 2 and the plate 8
constituting the magnetic circuit 9 at its tip, the magnet 5 and the yoke 6 are locked by the screw
7 ing.
[0012]
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
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.
[0013]
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.
[0014]
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.
[0015]
The magnet 5 is formed in a cylindrical shape, and a through hole 51 through which the screw 7
penetrates is formed at the central portion thereof. The 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
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diaphragm 4 and inside the bass voice coil 32. The outer circumference of the magnet 5 is set to
be larger than the circumference of the high sound magnetic gap described later.
[0016]
The yoke 6 is made of metal, is superimposed on the front surface of the magnet 5, and is
disposed between the 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 portion 61 to which
the magnet 5 is joined on the rear surface, and an extension portion 62 extending rearward from
the peripheral edge portion of the main body portion 61.
[0017]
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 magnet 5. As a result, the low-pitched
voice coil 32 is disposed in the gap 66, and the gap 66 acts as a low-pitched magnetic gap (first
magnetic gap).
[0018]
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 magnet 5. 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 body
portion 61 of the yoke 6 and the magnet 5 is accommodated within the circumference of the
annular groove 64. FIG. 3 is a cross-sectional perspective view showing the flow of magnetic flux
in the plate 8, the magnet 5 and the yoke 6. Arrows in the figure indicate the flow of magnetic
flux. As shown in FIG. 3, since the cross section of a portion of the main body portion 61 of the
yoke 6 is narrower than the cross section of the other portion due to the annular groove 64, the
portion functions as the magnetoresistive portion 68. 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 whose resistance is smaller than that of the magnetic resistance
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portion 68. 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.
[0019]
Next, the operation of the present embodiment will be described. When an audio signal is input,
the magnetic flux for bass emitted from the side surface of the magnet 5 based on the signal
passes through the bass voice coil 32 from the bass magnetic gap (the gap 66) and extends the
yoke 6 It will reach section 62. Thereby, sound wave radiation is performed from the low
frequency diaphragm 3. On the other hand, the high-pitched magnetic flux emitted from the
upper surface of the magnet 5 (the joint surface with the yoke 6) based on the audio signal
enters the main body portion 61 of the yoke 6 and avoids the magnetic resistance portion From
the gap (annular groove 64), the high-tone voice coil 41 passes through and reaches the body 61
of the yoke 6 again. Thereby, sound wave radiation is performed from the high-tone diaphragm
4.
[0020]
As described above, according to the present embodiment, even with one magnet 5, it is possible
to flow high-pitched magnetic flux and low-pitched magnetic flux into the magnetic gap. That is,
the driving of the bass diaphragm 3 and the treble diaphragm 4 can be performed by one
magnetic circuit 9. As described above, if one magnet 5 can be made common for high and low
tones, the number of the magnets 5 can be reduced, and along with this, the thickness of the
speaker 1 can be reduced. The number of assembly steps can also be reduced.
[0021]
Further, since the junction between the main body 61 of the yoke 6 and the magnet 5 is
contained within the circumference of the high-tone magnetic gap which is the annular groove
64, the magnetic flux emitted from the magnet 5 and passing through the junction is a highpitched noise. It becomes easy to enter into the magnetic gap, and the sound output efficiency
can be improved.
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[0022]
And since the protrusion 63 of the yoke 6 is set to the outer periphery smaller than the
circumference of the high-noise magnetic gap and the protrusion 63 and the magnet 5 are
joined, the magnet 5 is the circumference of the high-noise magnetic gap Even if the outer
circumference is larger than that, the junction between the yoke 6 and the magnet 5 is within the
circumference of the high-noise magnetic gap.
As a result, it is possible to make the size of the magnet 5 larger than the magnetic gap for high
sound while making it easy for the magnetic flux to enter the high 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.
[0023]
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 the magnet 5 is joined to the
projection 63 of the yoke 6 is described as an example, but it may be joined to the rear surface of
the yoke 6a without the projection 63 as shown in FIG. In this case, it is necessary to make the
outer periphery of the magnet 5a smaller than the circumference in order to fit the junction of
the main portion 61a of the yoke 6a and the magnet 5a within the circumference of the high
sound magnetic gap. For this reason, in order to secure the size of the magnet as large as
possible, it is preferable to join the magnet 5 to the projection 63.
[0024]
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 crosssectional 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 the modification of the
speaker of FIG. It is sectional drawing which shows schematic structure of the conventional
speaker.
Explanation of sign
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[0025]
Reference Signs List 1 speaker 2 frame 3 diaphragm for low frequency sound (first diaphragm) 4
diaphragm for high frequency sound (second diaphragm) 5 magnet 6 yoke 7 screw 8 plate 9
magnetic circuit 21 protrusion 31 through hole 32 low frequency voice coil Voice coil) 41 Voice
coil for high-pitched sound (second voice coil) 51 through hole 61 body part 62 extension part
63 protrusion 64 annular groove (second magnetic gap) 65 screw hole 66 gap (first magnetic
gap)
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