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DESCRIPTION JP2000184482

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DESCRIPTION JP2000184482
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker and a speaker device, and more particularly, to a speaker device in which the
counteracting force of the sound radiation force of a small magnetic shield type speaker and a
speaker diaphragm having a large magnetomotive force can be offset or attenuated. About.
[0002]
2. Description of the Related Art Conventionally, as an effective means for extending the low
range reproduction limit of a speaker device, for example, an opening and a duct are provided in
a baffle plate provided with a speaker, and the phase of sound emitted from the back of the
diaphragm of the speaker is detected. It is well known that a bass reflex type (phase reversal
type) speaker device that inverts and radiates from the opening through the duct to intensify the
sound wave emitted to the front from the diaphragm of the speaker so as not to distort the bass
region. It is done.
[0003]
As shown in FIG. 6, such a phase inversion type speaker device fixes the speaker 3 so as to face
the speaker sound emission hole 2a formed in the baffle plate 2 provided on the front surface of
the speaker box 1.
[0004]
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For example, as shown in FIG. 6, the speaker 3 is provided with a ring-shaped magnet 4 and a
plate 5 and a yoke 6 attached so as to sandwich the ring-shaped magnet 4. A magnetic air gap 7
is formed between it and the pole 6a.
Further, the frame 8 of the speaker 3 is attached to the plate 5, and an edge 9 is provided on the
outer peripheral portion of the diaphragm 10, and the outer peripheral portion of the coneshaped diaphragm 10 is held by the frame 8 by the edge 9.
[0005]
On the other hand, a voice coil bobbin 11 is attached to the inner periphery of the diaphragm 10,
a voice coil 12 is wound around the voice coil bobbin 11, and the voice coil 12 is formed by the
plate 5 and the center pole 6a of the yoke 6. The magnetic gap 7 is inserted.
A damper 17 holds the voice coil 12 in the magnetic gap 7.
[0006]
Further, an acoustic signal from the input terminal 13a provided at a predetermined position
outside the speaker box 1 is supplied to the terminal 15 of the speaker 3 through the connection
line 14a, and an acoustic signal from the terminal 15 is voiced through the tinsel wire 16. The
coil 12 is supplied.
[0007]
In addition, a duct 18 having an opening 18a in the same plane as the speaker sound emission
hole 2a of the baffle plate 2 is provided, and the phase of the sound emitted from the back
surface of the diaphragm 10 of the speaker 3 is reversed. Of the sound emitted from the front of
the diaphragm 10 is spread.
[0008]
As described above, by employing the phase-reversal type speaker device, the bass reproduction
limit can be lowered compared to the closed type, and the low-range reproduction range is
expanded to about 80% of the bass resonance frequency f0 of the speaker 3 It is supposed to be
possible.
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[0009]
In such a speaker device, as shown in FIG. 6, the sound radiation force F1 due to the vibration of
the diaphragm 10 of the speaker 3 is an acceleration .alpha.1 acting on the diaphragm 10 of the
speaker 3 to the equivalent mass M1 of the speaker 3. That is, F1 = M1. It can be expressed by
α1.
With respect to such a sound radiation force F1, the reaction force -F1 directed from the back
side of the diaphragm 10 toward the inside of the speaker box 1 is also remarkable when the
speaker apparatus is small and light and the volume of the speaker box 1 is small. The air in the
speaker box 1 repeats compression and expansion due to the vibration of 10, and this air acts as
a force to return the diaphragm 10 to the original position, thereby swinging the speaker box 1,
and the bass reproduction is inhibited. Had a problem.
[0010]
In order to solve such a problem, the present applicant has previously proposed a speaker
apparatus as shown in FIG. 7, and in FIG. 7, the same parts as in FIG.
[0011]
In FIG. 7, the speaker box 1 is integrally molded with the baffle plate 2 in a box shape of
synthetic resin.
The speaker 3 having the same configuration as that described in detail in FIG. 6 is fixed so as to
face the speaker sound emission hole 2 a formed on the upper side of the baffle plate 2.
The first duct 18 disposed below the baffle plate 2 and the opening 18 a are integrally formed
when the baffle plate 2 is molded.
[0012]
In the upper part of the back plate 1B, a speaker sound emitting hole 2b is formed at a position
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facing the speaker sound emitting hole 2a formed in the baffle plate 2, and the second speaker
3b, preferably the speaker 3 and the back face face each other. Similarly, the second duct 18b
fixed to the rear plate 1B to face the speaker sound emission hole 2b and having a larger duct
diameter than the first duct 18 is overlapped within a predetermined length of the first duct 18
And an integral mass of air which radiates to the opening 18a of the first duct 18 through the
opening 18c of the second duct 18b, and is integrally embedded with the rear face plate 1B so
that a concentric cross section is formed. It is configured to increase RD.
[0013]
Further, acoustic signals of the same input are supplied to the first and second speakers 3 and 3b
via the input terminals 13a and 13b disposed on the rear plate 1B and the connection lines 14a
and 14b.
[0014]
According to the speaker apparatus of FIG. 7 described above, the reaction force of the duct
radiation force FD1 and FD2 / 2 + FD2 / 2 between the first and second ducts 18 and 18b-FD1
and -FD2 / 2 + (-FD2 / 2) respectively Because of the cancellation, the reaction forces -F1 and -F2
of the radiation forces F1 and F2 of the first and second speakers 3 and 3b can be mutually
canceled if F1 .apprxeq.F2.
[0015]
Further, a ring-shaped cancel magnet 4a magnetically attached to the back surface of the yoke 6
in the thickness direction to the same pole as the S pole, for example, on the lower side of the
magnet 4 in the speaker 3 of FIG. A magnetically shielded speaker 3 in which an outer yoke 19,
which is a metallic shield cover formed in the above, is disposed to surround a magnetic circuit is
well known.
[0016]
However, in the above configuration, a pair of speakers 3 and 3b having substantially the same
structure is required in the speaker box 1, so that it becomes difficult to miniaturize the speaker
box 1 and it becomes expensive. There was a problem.
[0017]
Furthermore, in the two loudspeakers in which the vibration system of the loudspeakers is made
equal, the higher the low-pass resonant frequency f0, the Q of the resonance acuity increases in
proportion to f0. there were.
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[0018]
When the magnet is an external magnet type as shown in FIG. 6 and is a magnetically shielded
speaker, a large magnet 4a having a strong magnetomotive force is required.
However, since the magnetization directions are magnetized in mutually opposite directions, it is
not possible to increase the magnetomotive force (magnetic force) as a magnetic circuit, but
depending on the size of the cancel magnet 4a, although There is a problem that the
magnetomotive force can be utilized only at about 20% of the magnetomotive force of the
magnet 4 at the maximum.
[0019]
The present invention is intended to provide a speaker and a speaker device that solves the
problems of overhead, and the problem to be solved by the invention is to obtain a magnetic
shielding effect and to use two magnets and devise a magnetic path Therefore, the
magnetomotive force can be increased, the effect of the cancellation magnet can be taken out,
and the counteracting force of the sound radiation force of the speaker can be offset to expand
the low range and perform strong low range radiation, and at the same time, make the speaker
box lightweight. It is an object of the present invention to obtain a speaker and a speaker device
capable of preventing oscillation, reducing Q and improving sound quality.
[0020]
A speaker according to the present invention comprises first and second magnetic circuits each
comprising a magnet and a plate disposed on a yoke, and the yokes of the first and second
magnetic circuits. Back-to-back, and surrounding the first and second magnetic circuits in contact
with the outer diameter of a plate whose outer diameter of one plate of the first and second
magnetic circuits is larger than the outer diameter of the other plate. A magnetic gap is formed in
the outer yoke provided in the same manner, and the diaphragms in which the voice coil is
disposed in the magnetic gap of the first or second magnetic circuit through the magnetic gap
are emitted in mutually opposite directions. The
[0021]
According to the speaker of the present invention, it is possible to obtain a magnetic shield type
speaker and increase the magnetomotive force of the magnetic circuit, thereby obtaining a
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speaker device capable of canceling out or attenuating the reaction of the sound radiation force
in the speaker box with a small configuration. Be
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION One embodiment of a loudspeaker according
to the present invention will be described in detail below with reference to FIGS.
In the drawings, the corresponding parts to those in FIGS. 6 and 7 are denoted by the same
reference numerals.
[0023]
The loudspeaker of FIG. 1 shows a loudspeaker unit in which first and second loudspeakers 3
and 3b of substantially equal aperture are disposed back to back.
[0024]
In the example of FIG. 1, a cylindrical first center pole 6a protruding at a central position on the
disk-shaped first yoke 6 constituting the first magnetic circuit is erected on the first yoke 6. ing.
A ring-shaped first magnet 4 is bonded onto the first yoke 6 with an adhesive or the like.
The first magnet 6 has the N pole and the S pole in the vertical direction or the S pole and the N
pole in the vertical direction, and the first center pole 6 a is sufficiently longer than the thickness
of the first magnet 4. Let
[0025]
The ring-shaped first plate 5 is bonded and fixed onto the N pole of the ring-shaped first magnet
4 and between the inner peripheral surface of the first plate 5 and the outer peripheral surface of
the first center pole 6 a A first magnetic air gap 7 is formed.
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[0026]
A second yoke 6 'having the same diameter as the first yoke 6 is bonded to the back surface of
the first yoke 6 via an adhesive.
A second center pole 6a 'is embedded in the second yoke 6', and an N pole and an S pole and the
first magnet 4 have the same polarity direction in the vertical direction on the second yoke 6 ', or
the vertical direction. An S pole and an N pole and a second magnet 4 'magnetized in the
opposite polarity direction to the first magnet 5 are joined via an adhesive.
[0027]
A ring-shaped second plate 5 'is adhesively fixed onto the second magnet 4', and between the
inner peripheral surface of the second plate 5 'and the outer peripheral surface of the second
center pole 6a'. A second magnetic air gap 7 'is formed.
[0028]
The second plate 5 'has a diameter sufficiently larger than the diameter of the first plate 5 and
has a bottomed cylinder so as to cover the outer diameter portion of the second plate 5' and a
through hole 19a at the center of the bottom. And the outer yoke 19 having the
A third magnetic air gap 20 is formed between the through hole 19a bored at the bottom of the
outer yoke 19 and the opposing first center pole 7a.
[0029]
A funnel-shaped frame 8 similar to the speaker 3 described in detail in FIGS. 6 and 7 is joined to
the upper side of the outer yoke 19 with an adhesive, and the slightly elongated voice coil bobbin
11 is inserted into the through hole 19a of the outer yoke 19. The voice coil 12 is inserted into
the first magnetic gap 7 through the gap with the center yoke 6 a, and the voice coil 12 is wound
on the voice coil bobbin 11 in the first magnetic gap 7.
[0030]
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A free-edge funnel-shaped diaphragm that supports a damper 17 between an intermediate
position of the voice coil bobbin 11 and the bottom upper surface of the frame 8 and is
integrated with the edge 9 between the upper position of the voice coil bobbin 11 and the
maximum aperture of the frame 8 10 is supported, and the maximum outer diameter portion of
the edge 9 is fixed by a ring-shaped gasket 21.
A dust intrusion preventing cap 22 is joined on the voice coil bobbin 11.
Reference numeral 15 denotes a terminal fixed to the frame 8, and reference numeral 16 denotes
a tinsel wire connecting the terminal 15 and the voice coil 12.
[0031]
A diaphragm 8 ', an edge 9', a damper 12 ', a voice coil bobbin 12', a voice coil 11 ', and a cap
forming a vibration system disposed on a frame 8' fixed on a plate 5 'of the second speaker 3b.
22 ', gasket 21', terminal 15 'and tinsel wire 16' have substantially the same structure as the first
speaker 3 except that the voice coil 12 'is disposed in the second magnetic gap 7'.
[0032]
The fact that only the magnetic circuit portion of the speaker unit 23 described above can be
taken out to make the magnetomotive force strong and the number of magnetic fluxes can be
increased will be described below with reference to FIG.
[0033]
FIG. 2 shows a magnetic circuit portion in which the magnetization directions of the first and
second speakers 3 and 3b of FIG. 1 are partially changed. The left side of L makes the first and
second ring magnets 4 and 4 'have the same polarity as the S and N poles and the S and N poles
in the thickness direction, and on the first and second yokes 6 and 6' And the centerline C.1. The
right side of L overlaps the first and second ring magnets 4 and 4 'on the first and second yokes
6 and 6' in the opposite polarity to the N and S poles and the S and N poles in the thickness
direction. Case is shown.
[0034]
When the first and second magnets 4 and 4 'are overlapped in reverse polarity as shown on the
right side of FIG. 2, the same as the cancel magnet 19 described in FIG. 6 is obtained. In this
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magnetic circuit configuration, the outer yoke 19 is a shield yoke. Effect of increasing the
number of magnetic fluxes passing through the first and second magnetic air gaps 7 and 7 'and
effectively utilizing the magnetomotive force of the first and second magnets 4 and 4' which are
only utilized by about 20%. The magnetomotive force in the magnetic gaps 7 and 7 'can be
significantly increased.
[0035]
That is, in the magnetic circuit shown on the right side of FIG. 2, the magnetic flux emitted from
the N pole of the first magnet 4 is first plate 5 → first magnetic gap 7 → first center pole 6 a →
first yoke 6 → Closed circuit magnetic flux 25 reaching S pole of first magnet 4 and N pole of
first magnet 4 → first plate 5 → first center pole 6 a → third magnetic gap 20 → existence of
outer yoke 19 Bottom and outer periphery → second plate 5 ′ → second magnetic gap 7 ′ →
second center pole 6 a ′ → first yoke 6 → closed circuit magnetic flux 26 of S pole of the first
magnet 4 and the first N pole of first magnet 4 → first plate 5 → first magnetic gap 7 → first
center pole 6 a → third magnetic gap 20 → bottom and outer periphery of outer yoke 19 →
second plate 5 '→ 2nd magnetic gap 7' → 2nd center pole 6a '→ 2nd yoke 6' A closed circuit
magnetic flux 27 reaching the S pole of the second magnet 4 'and an N pole of the first magnet
4-> the first plate 5-> the first center pole 6a-> the first and second yokes 6 and 6' → S pole of
second magnet 4 ′ → N pole of second magnet 4 ′ → second plate 5 ′ → second magnetic
gap 7 ′ → second center pole 6a ′ → first and second Yokes 6 and 6 '→ closed circuit 28 to S
pole of first magnet 4 and N pole of second magnet 4' → second plate 5 '→ second magnetic gap
7' → second center pole 6a ′ → second yoke 6 ′ → close circuit magnetic flux 29 etc. of S pole
of second magnet 4 ′.
[0036]
Similarly, the center line C.1 of FIG. 2 constituting the first and second magnetic circuits. In the
magnetic circuit on the left side of L, the magnetic flux from the N pole of the first magnet 4 is
closed from the first yoke 6 → the first center pole 6 a → the first plate 5 → the S pole of the
first yoke 4 Circuit magnetic flux 25a, N pole of second magnet 4 '→ second plate 5' → first
magnetic gap 7 '→ second center pole 6a' → second yoke 6 '→ second magnet 4 The closed
circuit magnetic flux 29a leading to the S pole, the N pole of the second magnet 4 ', the second
plate 5', the outer peripheral portion of the outer yoke 19 and the bottom portion, the third
magnetic gap 20, the first center Pole 6a → first magnetic gap 7 → first plate 5 → S pole of first
magnet 4 → N pole of first magnet 4 → first and second yokes 6 and 6 ′ → second magnet
Closed circuit magnetic flux 26a reaching 4 'S pole, N pole of second magnet 4' → second plate
′ → outer peripheral portion and bottomed portion of outer yoke 19 → first center pole 6a →
first and second yokes 6 and 6 ′ → closed circuit magnetic flux 27a extending to S pole of
second magnet 4 ′ and second Magnet 4 '→ second plate 5 ′ → second magnetic gap 7 ′ →
second center pole 6a ′ → first and second yokes 6 and 6 ′ → first center pole 6a → first
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magnetic A closed circuit magnetic flux 28a or the like is generated from the air gap 7 → the
first plate 5 → the S pole of the first magnet 4 → the N pole of the first magnet 4 → the S pole of
the second magnet 4 '.
[0037]
Each of the magnetic fluxes described above is the distance between the bottom of the first plate
5 and the outer yoke 19, the gap between the first to third magnetic gaps 7, 7 ', 20, the first and
second magnets 4 and 4' and Depending on the magnetic path lengths of the yokes 6 and 6 'and
the plates 5 and 5', the number of magnetic flux in the first and second magnetic air gaps 7 and
7 'can be increased by appropriate selection This makes it possible to extract the conventional
magnetomotive force of the magnets 4 and 4 'by 1/3 or more of the total magnetomotive force
and increase the number of magnetic flux lines passing through the magnetic gaps 7 and 7'. A
magnetic force is applied.
[0038]
In this example, since the magnetic circuit is configured as described above, the center pole C.D.
In the configuration shown on the right side of L, the canceling effect of the outer yoke 19 is
remarkable, and in the configuration shown on the left side, a magnetic circuit that is easy to
magnetize is obtained. And 7 'which can significantly improve the magnetomotive force or
magnetic force.
[0039]
Also, according to this example, two ring magnets 4, 4 'are used, and among the three magnetic
gaps 7, 7', 20, the magnetic field with the strongest magnetic field (more magnetic flux) 7 and 7 '.
Since the diaphragm 10 is driven by this, the magnetic force that drives the diaphragm 10 is
increased, the sensitivity and the sound quality are improved, and the resonance sharpness Q at
the lowest resonance frequency of the bass of the speaker can be reduced. It is possible to obtain
a speaker device capable of expanding the bass reproduction band when using a small speaker
box.
[0040]
FIG. 3 shows another example of the configuration of the speaker unit 23 according to the
present invention, and the corresponding parts to FIG. 1 are given the same reference numerals
and the duplicate explanation is omitted. The figure shows a case where a tweeter vibration
system is disposed between the second plate 5 'and the second center pole 6a', and the
diaphragm 30 made of metal or the like in a dome shape is the second plate 5 '. The voice coil 12
'is held on the ring-shaped diaphragm ring 31 fixed on the upper side and is wound around the
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voice coil bobbin 11' joined to the diaphragm 30 in the second magnetic gap 7 'so as to be
vertically vibrated. It is a thing.
[0041]
FIG. 4 shows that the speaker unit 23 of FIG. 1 is disposed in the phase inversion type speaker
box 1 having the same configuration as that described in detail in FIG. 7 and the sound radiation
forces F1 and F2 of the first and second speakers 3 and 3a. Reaction forces -F1 and -F2 mutually
offset each other, and duct radiation forces FD1 and FD2 / 2 + FD2 / 2 reaction forces between
the first and second ducts 18 and 18b -FD1 and -FD2 / 2 + (-FD2 Because the vibration of the
small and light speaker box 1 is suppressed and the magnetic force for vibrating the diaphragms
10 of the speakers 3 and 3a is strong, the sensitivity and the sound quality of this speaker device
are offset. And the resonance sharpness Q at the lowest resonance frequency of the bass of the
speaker can be reduced, and a speaker apparatus capable of expanding the bass reproduction
band when the small speaker box 1 is used can be obtained. .
[0042]
FIG. 5 shows another configuration of the speaker device of the present invention, and the
difference from FIG. 4 is that the magnetic circuit of the first and second speakers 3 and 3a
constituting the speaker unit 23 is on the first magnet 4 In the case of the magnetic circuit of this
configuration, the magnetic yokes 7 and 7 'of the first and second magnetic air gaps 7 and 7' can
be obtained only by providing the outer yoke 19. It is possible to increase the force and make the
speaker box thinner.
[0043]
According to the present invention, the number of magnetic flux lines passing through the
magnetic gap of each of the magnetic circuits of the first and second loudspeakers passes a
plurality of types of paths through the outer yoke and the first and second center poles. Since a
plurality of crossed magnetic flux lines cross each other, a magnetic shield speaker can be
obtained with a simple configuration that does not require a cancellation magnet, and a strong
magnetic force can be obtained in the magnetic gap portion.
[0044]
In addition, since two ring magnets are used to drive the two back-to-back two vibrating plates
by the magnetic gap having the strongest magnetic field among the three magnetic gaps, these
two vibrating plates are The driving magnetic force is increased, the sensitivity and the sound
quality are improved, and the resonance acuity Q at the lowest resonance frequency of the
speaker's bass can be reduced, and the bass reproduction band is expanded when a small
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speaker box is used. Thus, it is possible to obtain a speaker device capable of canceling the
reaction of the radiation force of
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