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JP2000197186

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DESCRIPTION JP2000197186
[0001]
The present invention relates to a suitable speaker and speaker apparatus in which a small and
light speaker is built in a speaker box, and in particular, a second diaphragm is arranged on the
speaker and the sound radiation force of the speaker diaphragm is used. TECHNICAL FIELD The
present invention relates to a speaker and a speaker device configured to cancel or attenuate a
reaction force.
[0002]
2. Description of the Related Art In order to suppress the vibration of the baffle board of a
speaker box to which a speaker is conventionally attached, a vibrator or a vibrator which vibrates
in a direction opposite to the vibration direction of the speaker excited by a diaphragm. For
example, a speaker device having a transducer is described in detail in, for example, Japanese
Patent Application Laid-Open Nos. 63-212000 and 1-307398.
[0003]
A speaker device as shown in FIG. 5 is shown in the above-mentioned Japanese Patent
Application Laid-Open No. 62-212000.
In FIG. 5, 1 denotes a ring-shaped magnet, and 2 and 3 denote a plate and a yoke mounted so as
to sandwich the magnet 1 and having a magnetic gap 4 formed in a part thereof. The frame 5 of
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the speaker A is attached to the plate 2. An edge 6 is provided on the outer peripheral portion of
the diaphragm 7, and the outer peripheral portion of the conical diaphragm 7 is held by the
frame 5 by the edge 6.
[0004]
On the other hand, a voice coil bobbin 8 is attached to the inner peripheral portion of the
diaphragm 7, a voice coil 9 is wound around the voice coil bobbin 8, and the voice coil 9 is in the
magnetic gap 4 formed by the plate 2 and the yoke 3. Is inserted in the The configurations
shown by reference numerals 1 to 9 above are the basic structure of the known electrodynamic
loudspeaker A.
[0005]
One end of a screw 10 is screwed into the center on the back surface side of the yoke 3 of the
speaker A, and the other end of the screw 10 is a magnet 11 having the same configuration as
the magnet 1 in the speaker A, the plate 2 and the yoke 3 described above. , And a magnetic
circuit comprising a plate 12 and a yoke 13 is attached.
[0006]
Further, a frame 14 is attached to the plate 12 and two dampers 15 and 16 are attached to the
frame 14.
The drive coil bobbin 17 is held by the dampers 15 and 16.
[0007]
A drive coil 18 is wound around one end of the drive coil bobbin 17, and the drive coil 18 is
inserted in a magnetic gap 19 formed by the plate 12 and the yoke 13. A weight 20 is attached
to the other end of the drive coil bobbin 17, and a vibration system including the weight 20 is
substantially equal to an equivalent mass of a vibration system including the cone-shaped
diaphragm 7 in the speaker A. ing. The configuration shown above by reference numerals 11 to
20 indicates the electric and vibration transducer B.
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[0008]
In the above-described configuration, the speaker A and the electric / vibration transducer B are
attached to the baffle board 22 of the speaker box 21. Now, if an electric signal is supplied to the
voice coil 9 of the speaker A, the voice coil 9 vibrates in the lateral direction in the figure by a
known action to generate a driving force F1 and drives the cone-shaped diaphragm 7 to perform
sound reproduction. .
[0009]
At this time, when the same electric signal is applied to the drive coil 18 in the electric / vibration
transducer B, the drive coil 18 also vibrates in the lateral direction in the figure to generate a
driving force F2 to drive the weight 20 in the same direction. Here, if the equivalent mass of the
vibration system including the diaphragm 7 and the like in the speaker A and the vibration
system including the weight 20 and the like in the electric / vibration transducer B is
approximately equal, the reaction force −F1 received by the speaker A by the vibration system
The reaction force -F2 of the vibration system in the vibration transducer B is approximately
equal.
[0010]
Therefore, the reaction which the speaker A receives by the drive of the diaphragm 7 is canceled
by the electric / vibration transducer B, and the vibration of the baffle board 22 of the speaker
box 21 and the swing of the speaker box 21 are suppressed.
[0011]
Furthermore, in the above-mentioned Japanese Patent Application Laid-Open No. 1-307398, the
reaction force -F1 generated by the action force F1 of the diaphragm of the first speaker with the
cone openings of the diaphragms of the two speakers facing in the opposite direction There is
also disclosed a speaker device which is canceled by the reaction force -F2 of the action force F2
of the diaphragm.
[0012]
In the above-described conventional speaker device, there is a demand for reducing the volume
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of the speaker box 21 and achieving miniaturization and obtaining an inexpensive speaker
device. When the volume is reduced, the low frequency reproduction limit is increased, so that
the amplitude of the speaker A is increased.
[0013]
However, by increasing the amplitude of the small-sized speaker A, the sound pressure in the
speaker box 21 increases, and peaks and valleys occur in the frequency characteristics.
As a method of solving such a problem, a speaker device is also widely used which radiates the
low frequency band without distortion by effectively utilizing the sound wave emitted from the
back of the diaphragm 7 using the phase inversion type speaker box 21. It is done.
[0014]
In order to incorporate the speaker A shown in FIG. 5 into the above-described small-sized phasereversal type speaker box 21, a pair of speakers A and an electric vibration transducer B having a
substantially identical structure as in FIG. The speakers must be disposed back to back, and the
depth direction of the speaker box 21 becomes large, which makes it difficult to miniaturize and
expensive.
[0015]
Furthermore, in the two speakers in which the vibration system of the speaker A is made equal,
the higher the lowest resonance frequency f0 of the vibration system, the higher the resonance
sharpness Q in proportion to f0. was there.
[0016]
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 present invention is to use the single
speaker A to transition f0 of the speaker A to the low frequency side It is an object of the present
invention to provide a speaker apparatus capable of performing expansion of a low band and
high quality low band radiation and preventing swing of the light speaker box 21.
[0017]
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A speaker according to the present invention comprises a cap 24 for covering the inner diameter
portion of the first diaphragm 7 to maintain the airtightness of the space portion behind the
inner diameter portion, and a center pole constituting a magnetic circuit. A through hole 3c
bored in 3a, a second diaphragm 26 movably pivoted behind the magnetic circuit while
maintaining airtightness, and an airtight chamber 29 airtightly surrounding the second
diaphragm 26. And the second diaphragm 26 is driven in the direction opposite to the driving
direction of the first diaphragm 7 by changing the air pressure in the space 4 a when the first
diaphragm 7 is driven. is there.
In the speaker device of the present invention, the second diaphragm 26 communicating with the
space portion 4a in which the inner diameter portion of the first diaphragm 7 is covered with the
airtight cap 24 is disposed behind the magnetic circuit. A speaker A in which the diaphragm 26 is
disposed in an airtight chamber 29 communicating with the space 4 a is mounted in the speaker
box 21.
[0018]
According to the speaker and the speaker device of the present invention, the miniaturization of
the speaker is achieved, and the electro-acoustic conversion efficiency is improved, and the
sound radiation force of the first diaphragm by the first and second diaphragms of one speaker It
is possible to offset or attenuate the reaction force of the speaker box, and to reduce the depth
between the baffle board and the back plate of the speaker box for miniaturizing.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION One embodiment of a loudspeaker and a
loudspeaker apparatus according to the present invention will be described below with reference
to FIGS.
The parts corresponding to the speaker device shown in FIG. 5 are indicated by the same
reference numerals.
[0020]
FIG. 1 shows a side sectional view of the speaker of this example, A shows the small speaker of
this example as a whole, and the yoke 3 has a disc-like portion made of a plate material such as
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pure iron and the central position of this disc-like portion. A vertically extending cylindrical
center pole 3a and a magnet guide portion 3b consisting of a step portion formed in a disk shape
concentrically with the center pole 3a are integrally formed.
[0021]
At the center position of the center pole 3a, a through hole 3c is formed through the yoke 3 from
the upper side.
[0022]
A ring-shaped driving magnet 1 magnetized in the thickness direction of ferrite or the like is
adhered onto the disk-like portion of the yoke 3 described above via an adhesive.
The inner diameter of the ring-shaped drive magnet 1 is fitted to the step of the magnet guide
portion 3b formed in the disk-like portion of the yoke 3 and positioned.
[0023]
The plate 2 is joined onto the driving magnet 1.
In this case, the gap guide is kept inserted into the center pole 3a, an adhesive is applied to the
top surface of the driving magnet 1, and the inner diameter of the plate 2 is inserted into the
outer diameter of the gap guide and fixed.
The plate 2 is made of pure iron or the like in the form of a disc, and is a punched plate material
having a through hole at its center and a voice coil bobbin in a magnetic gap 4 formed between
the inner periphery of the through hole and the outer diameter of the center pole 3a. 8 are
provided.
[0024]
The metal part of the magnetic circuit is configured by fixing the frame 5 formed in a funnel
shape with steel or the like to the plate 2.
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[0025]
The voice coil 9 wound around a cylindrical voice coil bobbin 8 is inserted into the magnetic gap
4 of the magnetic circuit described above, and through the air-permeable damper 23 having a
corrugated corrugation that can swing in the vertical direction. The voice coil bobbin 8 is held.
[0026]
The inner diameter portion of the damper 23 is bonded to the middle portion of the voice coil
bobbin 8 via an adhesive, and the outer diameter portion is bonded to the outer periphery of the
bottom portion of the frame 5.
Furthermore, the inner diameter of the funnel-shaped first diaphragm 7 with free or fixed edge 6
made of paper or the like is joined to the upper outer diameter of the voice coil bobbin 8, and the
largest diameter of the first diaphragm 7 is a frame. It fixes to the upper opening peripheral part
of 5 via the gasket 25.
Reference numeral 30 denotes a tinsel wire and 31 denotes an input terminal.
[0027]
Furthermore, in the present invention, the first space formed under the cap 24 by bonding the
airtight cap 24 to the top of the voice coil bobbin 8 or the inclined portion of the cone inner
periphery of the diaphragm 7 with an adhesive or the like. Hold the section 4a airtight.
[0028]
Further, the holder 27 is bonded and fixed to the bottom surface of the yoke 3 with an adhesive
or the like so as to face the through hole 3c bored in the center pole 3a.
[0029]
The holder 27 has an upper surface of a cylindrical portion 27c of a substantially bottomed
cylindrical synthetic resin as shown in FIG. 2 or FIG. A strip-like rib 27b is provided which
protrudes in a Y-shape in the circumferential direction at an angle of 120 ° from the center of
the bottom 27a.
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[0030]
Three substantially triangular gaps are formed around the rib 27b of the holder 27.
An adhesive is applied to the upper surface of the rib 27 b and bonded to the lower surface of
the yoke 3.
[0031]
At the opening of the cylindrical portion 27c of the holder 27, a second diaphragm 26
constituted by a substantially disc-shaped diaphragm 26b and an edge 26a having a dome-like
cross section is pivotally mounted so as to be able to swing.
[0032]
Furthermore, a casing 28 such as a bottomed cylindrical metal or the like is fitted on and fixed to
the outer periphery of the yoke 3 so as to surround the second diaphragm 26 including the
holder 27, and the inside of the casing 28 can be airtightly held. A closed room 29 is made.
[0033]
In the speaker A of the above-described configuration, the inner wall of the voice coil bobbin 8
covered with the cap 24 and the center pole 3a are pierced by the outer periphery of the center
pole 3a, the second space 4b surrounded by the inner diameter of the magnet 1, and the cap 24.
The pressure difference between the first space portion 4a in the second diaphragm 26
communicated through the hole 3c is substantially reduced by the extremely small magnetic gap
portion 4 between the inner diameter of the voice coil bobbin 8 and the outer diameter of the
center pole 3a. The second diaphragm 26 is moved in the opposite direction with respect to the
moving direction of the first diaphragm 7 using the isolated state and the reaction of the driving
direction of the first diaphragm 7 It is intended to offset the power.
[0034]
The operation of this speaker is the same as that of the speaker A of the other embodiment
shown in FIGS. 2 and 3 and will be described later. The difference in configuration between the
speaker A of FIGS. 2 and 3 and that of FIG.
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[0035]
A difference from FIG. 1 of FIG. 2A is that a concentric cancellation magnet 33 is bonded to the
bottom surface of the yoke 3 via an adhesive or the like in order to make the loudspeaker A of
the magnetic shielding type.
The polarity in the thickness direction of the cancel magnet 33 is reverse to that of the magnet 1.
Further, a cylindrical shielding metal fitting 32 surrounding the magnetic circuit including the
cancel magnet 33 and the magnet 1 of the magnetic circuit similar to that of FIG. 1 is made
metallic and the N pole of the bottom of the cancel magnet 33 and the plate The configuration is
the same as that of FIG. 1 except that a magnetic flux passing between N poles of 2 constitutes a
magnetic path so that a leakage magnetic flux is not generated to the outside.
[0036]
Accordingly, in the speaker A of the configuration of FIG. 2 (A), the air volume of the first space
portion 4a is increased compared to the speaker A of the configuration of FIG. 1 only in the space
portion surrounded by the bottom surface of the yoke 3 and the inner diameter of the cancel
magnet 33. doing.
[0037]
The embodiment shown in FIG. 3 is the same as that shown in FIG. 2 except that the same
magnetically shielded speaker A as that shown in FIG. 2A is configured and the shape of the
second diaphragm 26 is changed.
[0038]
The second diaphragm 26 of the speaker A shown in FIG. 3A extends the support piece 32d in
the radial direction to hold the disc portion 32b at the center of the bottom of the shield fitting
32 at the bottom 32a of the shield fitting 32. An arc-shaped opening groove 32 c is formed
between the disk portion 32 b and the bottom portion 32 a of the shielding fitting 32.
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A cylindrical holder 27 is fixed to the lower side of the disc portion 32b, the second diaphragm
26 is pivotally pivotally attached to the opening end of the holder 27, and a diameter larger than
the outer periphery of the opening groove 32c is The bottomed cylindrical casing 28 having a
bottom is airtightly fixed to the bottom 32 d of the shield fitting 32 to form an airtight chamber
29.
[0039]
The operation of the speaker A having the configuration described in detail in FIGS. 1 to 3 will be
described at the same time with reference to FIGS. 1 to 3.
[0040]
Now, in the speaker A of FIG. 1 to FIG. 3, it is assumed that the voice coil 9 is supplied with a
predetermined power to drive the first diaphragm 7 and moved forward by the sound radiation
force indicated by F. The volume in the space of the first space 4 a in the coil bobbin 8 is
increased.
[0041]
Accordingly, the pressure of the air in the first space 4a is reduced, and the pressure in the first
space 4a becomes the second space as shown by the flow of air indicated by the arrow C in FIGS.
4b → through the magnetic gap 4 between the outer periphery of the center pole 3a and the
voice coil bobbin 8 and through the triangular gap formed between the through hole 3c bored in
the center pole 3a and the rib 27b between the yoke 3 and the holder 27 It flows into the airtight
chamber 29 and becomes a steady air pressure (1 atm) state, but at this time, the air pressure of
the front surface (the lower side in FIG. 1) of the second diaphragm 26 in the airtight chamber
29 is reduced. Then, the second diaphragm 26 moves in the backward direction indicated by the
arrow F1.
Therefore, the direction of movement of the first diaphragm 7 and the direction of movement of
the second diaphragm 26 become opposite, and the counteracting force -F of the sound radiation
force F of the first diaphragm 7 is canceled if F = F1. It becomes possible to do.
[0042]
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Similarly, when the first diaphragm 7 is driven rearward, the volume of air in the first space 4 a
decreases, so the pressure in the first space 4 a increases.
That is, as the air in the first space 4a is indicated by the flow of air shown by the arrow D in
FIGS. 1 to 3, the space between the first space 4a → the outer periphery of the center pole 3a
and the voice coil bobbin 8 It flows into the second space 4 b through the air gap 4 and is
compressed by the steady air pressure.
Therefore, the volume in the airtight chamber 29 in front of the through hole 3c communicating
with the first space portion 4a and the second diaphragm 26 decreases, and the pressure
increases, so that the second diaphragm 26 becomes the arrow F1. The sound radiation force -F
in the opposite direction of the first sound radiation force F is canceled by the sound radiation
force -F1 in the opposite direction of the second sound radiation force F1 to be pushed forward
in the direction opposite to the direction shown in It will be done.
[0043]
Now let the sound radiation force of the first diaphragm 7 be F, the mass of the first diaphragm 7
and the additional mass of air be M, and the acceleration of the first diaphragm 7 be α.
Assuming that the sound radiation force is F1, the mass of the second diaphragm 26 and the
additional mass of air are M1, and the acceleration of the second diaphragm 26 is α1, F = M · α
... (1) F1 = M1 · α1. According to the speaker of this example, the sound radiation force of the
first diaphragm 7 is the reaction force -F for the sound radiation force F of the first diaphragm 7
and the second diaphragm 26. The counteracting force -F1 which works can be mutually
canceled or attenuated by setting F = M.alpha..apprxeq.F1 = M1.alpha.1.
[0044]
FIG. 4 shows the case where the speaker A of the present invention is disposed in the phase
inversion type speaker box 21. In FIG. 4, the speaker sound emission hole 34 in which the
speaker A described in detail in FIG. The front surfaces of the first diaphragm 7 are fixed so as to
face each other.
[0045]
The speaker box 21 has a double-phased phase-reversal type duct, and a small diameter
cylindrical first duct 21a extended from the duct opening 21c drilled at the lower end of the
baffle board 22 into the speaker box 21; A large-diameter cylindrical second duct 21b is
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extended from the rear face plate 21B of the box 21 so that the second duct openings 21d
overlap each other to the front side of the baffle board 22, and By making the cut surfaces
concentric with each other, the sound radiation force FD1 from the duct 21a at the first duct
opening 21c and its reaction force-FD1 is the sound radiation force FD2 from the second duct
opening 21d. And the reaction force thereof-the speaker device of the present invention does not
swing the small and light speaker box 21 because it works so as to mutually offset each other by
the FD 2. The reaction force -F for that sound radiation force F it is sufficient so as to offset the
action force F1 generated by the second diaphragm 26.
[0046]
According to the speaker and the speaker device of the present invention, the second diaphragm
and the first space portion are passed in the direction opposite to the direction of the sound
radiation force added to the sound radiation force of the first diaphragm. A force that offsets the
sound radiation power can be automatically generated by the speaker itself, so that even with a
small speaker and a lightweight speaker device, the oscillation due to the reaction of the sound
radiation power of the speaker can be suppressed and the bass can be strongly radiated The low
frequency resonance frequency can be expanded to the low frequency side.
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