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JPH1127784

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DESCRIPTION JPH1127784
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudspeaker and a loudspeaker apparatus incorporating a loudspeaker in a cabinet.
[0002]
2. Description of the Related Art In order to suppress the vibration of a baffle board of a cabinet
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 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 attached so as
to sandwich the magnet 1 and forming a magnetic gap 4 in a part thereof. A speaker frame 5 is
attached to the plate 2, and an edge 6 is provided on the outer peripheral portion of the frame 5,
and the outer peripheral portion of the cone-shaped diaphragm 7 is held by the edge 6.
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[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 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
[0005]
The configurations shown by reference numerals 1 to 9 above are the basic structure of the
known electrodynamic speaker unit A.
[0006]
One end of a screw 10 is screwed into the center on the back surface side of the yoke 3 of the
speaker unit A, and the other end of the screw 10 is a magnet having the same configuration as
the magnet 1, plate 2 and yoke 3 in the above speaker unit. A magnetic circuit consisting of 11, a
plate 12 and a yoke 13 is mounted.
[0007]
A frame 14 is attached to the plate 12, and further, two dampers 15 and 16 are attached to the
frame 14, and the drive coil bobbin 17 is held by the dampers 15 and 16.
[0008]
A drive coil 18 is wound around one end of the drive coil bobbin 17, and the drive coil 18 is
inserted into 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. The vibration system
including the weight 20 is substantially equal to the inertia mass of the vibration system
including the cone diaphragm 7 and the like in the speaker unit A. It is done.
[0009]
The configuration shown above by reference numerals 11 to 20 indicates the electric and
vibration transducer B.
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In the above configuration, the speaker unit A and the electric / vibration transducer B are
attached to the baffle board 22 of the cabinet 21.
Now, when an electric signal is supplied to the voice coil 9 of the speaker unit A, the voice coil 9
vibrates in the lateral direction in the figure by a known operation, and the cone diaphragm 7 is
driven to reproduce sound.
[0010]
At this time, when the same electrical 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 drawing, and
drives the weight 20 in the same direction.
Here, if the inertia mass of the vibration system including the diaphragm 7 and the like in the
speaker unit A and the vibration system including the weight 20 and the like in the electric /
vibration transducer B is substantially equal, reaction, electricity and vibration received by the
speaker unit A by the vibration system The reaction of the vibration system at the transducer B is
approximately equal. Therefore, the reaction which the speaker unit A receives by the drive of
the diaphragm 7 is canceled by the electric and vibration transducer B, and the vibration of the
baffle board 22 of the cabinet 21 is suppressed.
[0011]
On the other hand, there is a demand for obtaining an inexpensive speaker system by reducing
the volume of the cabinet 21 and achieving miniaturization, but generally, as the volume of the
cabinet 21 is reduced, the speaker unit A To increase the low frequency reproduction limit so as
to suppress the rise of the low range regeneration limit.
[0012]
However, by increasing the amplitude of the small-sized speaker, the sound pressure in the
cabinet 21 increases, and peaks and valleys occur in the frequency characteristics.
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As a method to solve such a problem, a speaker device using a phase-reversal type bass reflex
cabinet to effectively utilize the sound wave emitted from the back of the diaphragm to radiate
the low frequency region without distortion is also widely used. ing.
[0013]
When the speaker and the speaker device are made smaller, the volume of the cabinet 21 is
made smaller, and the structure is made lighter with plastic etc., the speaker device as shown in
FIG. The back surface of the cabinet 21 is rocked by the sound pressure P radiated from the
damper 16 of the vibration transducer B, the weight 20 and the speaker unit A.
[0014]
The sound pressure in the cabinet 21 increases in inverse proportion to the volume of the
cabinet 21. Therefore, if the sound pressure in the cabinet 21 becomes large, the back surface of
the cabinet 21 vibrates at a specific frequency, and if the resonance frequency is reached Is
swaying, rocking, and causing problems such as deterioration of the sound quality of the bass.
[0015]
SUMMARY OF THE INVENTION The present invention provides a speaker and a speaker device
that solves the problem of overhead, and the problem to be solved by the invention is to increase
the sound pressure in a small and light speaker and a small and light speaker device. It is an
object of the present invention to provide a speaker and a speaker device which can be improved
in sound quality, can not move a lightweight cabinet, and can emit strong bass.
[0016]
SUMMARY OF THE INVENTION The speaker according to the present invention is formed so as
to control the back pressure in the cabinet by mutually canceling the sound pressure in the
cavity formed by opposing or juxtaposing the diaphragms to each other. And a speaker device.
[0017]
According to the present invention, it is possible to obtain a speaker and a speaker device in
which a small and lightweight cabinet is not rocked.
[0018]
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BEST MODE FOR CARRYING OUT THE INVENTION A loudspeaker and a loudspeaker apparatus
according to the present invention will be described below with reference to FIG.
FIG. 1 shows the principle of the present invention, and a speaker mounting hole A and a vibrator
are provided in a speaker mounting hole formed on the upper side of a baffle board 22 fixed to
the front of a small lightweight cabinet 21 made of synthetic resin or the like. Alternatively, an
electric / vibration transducer (hereinafter referred to as a vibrator) B is integrated and fixed so
that the diaphragms 7A and 7B face each other.
[0019]
An opening and a duct 23 are formed in the same plane as the speaker mounting hole of the
baffle board 22 so as to invert the phase of the sound emitted from the back surface of the
vibrator B and radiate it out of the cabinet.
In this example, a phase-reversal type bath reflex cabinet is formed.
[0020]
Further, an audio signal is supplied to the input terminal TA through the amplifier 24A to the
speaker unit A, and an audio signal identical to an audio signal to be applied from the input
terminal TB to the input terminal TA to the vibrator B is the phase inverting circuit 25 and It is
supplied via the amplifier 24B.
The phase reversing circuit 25 is unnecessary if the winding directions of the voice coils of the
speaker unit A and the vibrator B are made opposite to each other or the magnetization
directions of the magnets are made opposite.
[0021]
In the principle configuration diagram of FIG. 1, when an audio signal is supplied to the input
terminals TA and TB, the force of F = m0 α0 acts as the arrow in FIG. 1 in the speaker unit A. Is a
force of -F = mK.alpha.k, where m0 and mk are effective masses of the speaker unit A and the
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exciter B, and .alpha.0 and .alpha.k are accelerations of the speaker unit A and the exciter B,
respectively.
[0022]
As described above, when the speaker unit A and the vibrator B are driven, the force of -F 'acts on
the force of the speaker unit A in the direction F by the reaction. For the force in the direction,
the force of F 'acts by the reaction.
[0023]
Now, in the space (hereinafter referred to as a cavity) 26 generated when the diaphragm 7A of
the speaker unit A faces the diaphragm 7B of the vibrator B, the force -F 'by the speaker unit A
and the force by the vibrator B The magnitude and orientation of F 'act to cancel each other so
that the stiffness S of the air in the cavity 26 is zero if -F' = m0 α0 and F '= mk αk are equal.
Generally, even if -F '= F' can not be established, the stiffness S can be reduced.
[0024]
As will be described later, the vibrating plate 7B of the exciter B is formed of an air vent 7 or an
air-permeable cloth or a damper so that the air in the cavity 26 is as shown by the arrow 28. It
circulates in the cabinet 21 and does not emit sound pressure.
[0025]
Assuming that the cabinet 21 constituting the upper, lower, left, and right side walls and the
baffle board 22 are integrally formed, the cabinet 21 receives a force in the left direction in FIG.
1 by the force of the speaker unit A in the F direction. Since the drive force of −F opposite to the
drive force of the speaker is given to B, the cabinet 21 is pulled to the right in FIG. 1 and the
magnitude and direction of the force to move the cabinet 21 is F and As determined by the
difference of -F, if the force F and the force -F are equal, the cabinet 21 will not swing.
[0026]
In general, the force F = m 0 α 0 applied to the diaphragm in the case of a dynamic speaker is
determined by the following equation (1).
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[0027]
Here, WE is an audio signal input applied to the speaker unit A or the vibrator B, Bg is the
magnetic flux density of the gap of the magnetic circuit, Vv is the effective volume of the voice
coil, δ is the specific resistance of the material of the voice coil, Q is It is the resonance
sharpness of the speaker unit A or the vibrator, and the forces of the speaker unit A and the
vibrator B cancel each other by appropriately selecting the above-mentioned WE, Bg, Vv, δ, Q or
m0, mk. F = -F can be selected under various conditions.
[0028]
Therefore, in order to set F = m0 α0 = mk αk, the equivalent mass m0 of the speaker unit A and
the equivalent mass mk of the exciter B should be the same or the magnetic flux density Bg of the
gap of the magnetic circuit of the speaker unit A and the excitation It is the easiest method to use
the same magnetic circuit or the like so that the magnetic flux density Bg of the gap of the
magnetic circuit of the vessel B becomes the same.
With such a configuration, it is possible to obtain a speaker device which does not swing even if
the small and lightweight cabinet 21 is not made of a heavy material.
[0029]
Also, the driving force on the vibrator B side may be smaller than that of the speaker unit A.
In this case, the compliance corresponding to the driving force difference (F'-F ') in the cavity 26
and the compliance in the volume of the cabinet 21 are canceled and the equivalent resistance of
air is added, and equivalent mass M is equivalent. The speaker and the speaker apparatus of the
structure which can dump a vibration with the compliance of the air which formed the cabinet of
(1) between the speaker and the diaphragm of the vibrator (of course the speakers may be one
another) can be obtained.
Of course, it is also possible to use for air dumps of baffle boards or other vibrators as well as
cabinets.
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[0030]
As the speaker unit A shown in FIG. 1, a general small-sized speaker unit A similar to that used in
FIG. 5 can be used.
In addition, it is possible to use a magnetic shield type speaker in which a cancel magnet and a
shield cover that are oppositely magnetized to the magnetization direction of the magnet 1 are
provided on the back surface of the yoke 3.
[0031]
Moreover, an example of a structure of the vibrator B used for this invention is demonstrated
using FIG.2 and FIG.3.
In FIG. 2, the vibrator B of this example is formed of a disk-shaped plate material, and a stepped
portion is formed concentrically so as to surround a column-shaped center pole 34a and the
center pole 34a embedded in the center. A yoke 34 having an inverted T-shaped cross section in
which a magnet guide 34b is integrated, and a ring-shaped magnet 33 magnetized in the
thickness direction and having an inner diameter fitted and joined to the magnet guide 34b of
the yoke 34 A magnetic circuit of a metal part is constituted by a ring-shaped plate 31 bonded to
the upper surface of the magnet 33 with an adhesive or the like and a funnel-shaped frame 37
made of steel or the like fixed on the plate 31.
[0032]
A state in which a spacer such as kraft paper is wound around the inner periphery of the voice
coil bobbin 38 in order to insert the voice coil 38a wound around the voice coil bobbin 38 in the
concentric magnetic gap 47 between the center pole 34a and the plate 31 Then, the voice coil
bobbin 38 is inserted into the center pole 34 a from the upper side, and the position of the voice
coil 38 a is set so as to be disposed in the magnetic gap 47.
[0033]
A corrugated concentric damper 39 is bonded between the outer diameter of the upper end of
the voice coil bobbin 38 and the bottom of the frame 37 with an adhesive or the like, and the
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inner diameter of the diaphragm 7B has a plurality of vents 48 formed in a funnel shape. The
part is fitted and joined to the outer diameter of the upper end of the voice coil bobbin 38, and
the largest diameter part of the diaphragm 7B is joined to the largest diameter opening of the
frame 37 via the arrow 42.
[0034]
After the adhesive is dried, the spacer inserted into the inner diameter of the voice coil bobbin 38
is removed, and a cap 44 having a plurality of vent holes 48 formed therein is joined to the upper
surface of the voice coil bobbin 38.
[0035]
A lead wire is drawn from the voice coil 38a, connected to the input terminal 45 through the
tinsel wire 46, and an electrical signal is supplied to the voice coil 38a through the input terminal
45.
Although the case where the magnet 33 magnetized in advance is assembled has been described
above, the non-magnetized magnet 33 may be magnetized at the final assembly stage.
[0036]
FIG. 3 shows another example of the configuration of the vibrator of the present invention, and
the parts corresponding to those in FIG.
[0037]
In FIG. 3, the configuration up to the magnetic circuit and the lower damper 39a having air
permeability is the same as that of FIG. 2, but air permeable formed with a cloth between the
maximum outer diameter opening of the frame 37 and the outer diameter of the voice coil
bobbin 38 A good upper damper 39b is provided.
The outer diameter portion of the upper damper 39b is fixed to the frame 37 via the arrow 42,
and the upper damper 39a and the input terminal 37 are connected via the tinsel wire 46, and
the tinsel wire and the voice coil 38a are connected.
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In this configuration, the upper damper 39b constitutes the diaphragm 7B.
Also, the cap 44 which is covered on the upper surface of the voice coil bobbin 38 is also
selected from a material having good breathability such as cloth.
[0038]
FIG. 4 shows another configuration of the speaker device according to the present invention. In
FIG. 1, the cavity 26 is formed so that the diaphragm 7A of the speaker unit A and the diaphragm
7B of the vibrator B face each other. In FIG. 4, two loudspeakers or loudspeaker units A and the
funnel-shaped openings of the diaphragms 7A and 7B of the exciter B are arranged in the same
direction, and the loudspeakers are formed in the baffle board 22 of the cabinet 21 A cylindrical
member 49 is inserted into the mounting hole and fixed to the baffle board 22, and integrated
with the cabinet 21 so as to form a cavity 26 between the diaphragms 7A and 7B arranged in
parallel.
[0039]
According to the present invention, the vibrator B is constructed to cancel the force -F acting in
the opposite direction to the force F generated by the speaker unit A without making the cabinet
heavy, and dump the cabinet vibration. An air-dumpable cavity is provided to provide air
compliance, which can suppress cabinet swings, increase the radiation power of the speaker's
sound, increase the bass radiation, improve the sound quality, and fix the speaker A speaker
capable of dumping the vibration of the
[0040]
Brief description of the drawings
[0041]
1 is a principle configuration diagram of the speaker device of the present invention.
[0042]
2 is a cross-sectional view of a vibrator used in the present invention.
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[0043]
3 is a cross-sectional view of another vibrator used in the present invention.
[0044]
4 is a configuration diagram of another speaker device of the present invention.
[0045]
5 is a partial cross-sectional view of a conventional speaker device.
[0046]
Explanation of sign
[0047]
A: Speaker unit, B: Vibrator, 7A, 7B: Diaphragm, 21: Cabinet, 22: Baffle board, 48: Vent
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