close

Вход

Забыли?

вход по аккаунту

?

DESCRIPTION JPH1146396

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH1146396
[0001]
The present invention relates to a small speaker unit and a small and light speaker apparatus
incorporating a vibrator in a cabinet, and in particular, to drive the vibrator through a generator
coil provided in the speaker unit. Relates to the created speaker device.
[0002]
2. Description of the Related Art In order to suppress the vibration of a baffle board of a cabinet
to which a speaker unit 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 an electric / vibration transducer is known and described in detail in JPA-63-212000 and JP-A-1-307398.
[0003]
The above-mentioned Japanese Patent Application Laid-Open No. 62-212000 discloses a speaker
apparatus as shown in FIG.
In FIG. 15, 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 forming a magnetic gap 4 in a part thereof. The frame 5 of the
speaker unit A 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 conical diaphragm 7 is held by the
10-04-2019
1
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 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 indicated 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 has the same configuration as the magnet 1,
plate 2 and yoke 3 in the speaker unit A described above. A magnetic circuit comprising the
magnet 11, the plate 12 and the yoke 13 is attached.
[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. 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 approximately equal to the inertia mass of the vibration system
including the cone-shaped diaphragm 7 and the like in the speaker unit A. It is made.
The configurations indicated by reference numerals 11 to 20 above indicate the electric and
vibration transducer B.
10-04-2019
2
[0009]
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-shaped
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.
[0011]
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.
[0012]
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.
10-04-2019
3
[0013]
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.
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.
[0014]
In this way, when the speaker unit and the speaker device are miniaturized, the volume of the
cabinet 21 is reduced, and it is made light with plastic etc., the speaker device as shown in FIG.
The back surface of the cabinet 21 swings due to the sound pressure P emitted from the back
surface of the damper 16 and the diaphragm 7 of the speaker unit A.
[0015]
Since the sound pressure in the cabinet 21 increases in inverse proportion to the volume of the
cabinet 21, the volume in the cabinet 21 decreases, and if the sound pressure increases, the back
surface of the cabinet 21 vibrates at a specific frequency, and If it reaches, the entire cabinet 21
is shaken and oscillated, the cabinet moves, and the sound quality in the low band is degraded,
and there is a problem that a complicated peak and valley is generated in the reproduced sound
in the low band.
In order to solve such a problem, the applicant previously integrated the baffle board 22 and the
cabinet 21 as shown in FIG. 16 in the configuration for suppressing the vibration of the baffle
board 22 as shown in FIG. As the reaction of the driving force F of the diaphragm of the speaker
unit is canceled by the reaction of the driving force -F in the opposite direction of the electric /
vibration transducer B (hereinafter referred to as the vibrator), the movement of the cabinet 21 is
suppressed. The proposed speaker device is proposed.
[0016]
The above-mentioned FIG. 16 is a cabinet 21 of the bus reflex type, in which the speaker units A
and the exciters B are disposed back to back with the magnetic circuit units, and the speaker
10-04-2019
4
units A and the excitation are provided. An electric signal is supplied from the electric input
terminals TA and TB of an acoustic signal or the like to the input terminals 24 and 25 of the unit
B via the power amplification circuits 26 and 27.
[0017]
Therefore, the configuration shown in FIG. 16 requires two power amplification circuits 26 and
27 for driving the speaker unit A and the exciter B, thus providing a short circuit for obtaining a
compact, lightweight and inexpensive speaker device. .
[0018]
The present invention seeks to obtain a speaker device that solves the problems of overhead, and
the problem to be solved by the invention is to drive the vibrator using the power generation
mechanism provided in the speaker unit. In addition, it is an object of the present invention to
provide a speaker apparatus capable of driving the speaker unit A and the vibrator B by one
power amplifier.
[0019]
According to the present invention, there is provided a speaker apparatus in which a power
generating means is provided in a magnetic circuit of a speaker unit, and the vibrator is driven by
the power generating means.
[0020]
According to the speaker device of the present invention, a power amplifier for driving the
vibration device is not required, and a speaker device with a low cost and a large radiation power
can be obtained.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION A speaker device according to the present
invention will be described below with reference to FIGS.
FIG. 1 is a view showing the principle of the speaker apparatus according to the present
invention. Similar to FIG. 16, FIG. 1 shows the magnetic circuit of the speaker unit A disposed
opposite to the speaker mounting hole 29a in the bus reflex cabinet 21 and The magnetic
10-04-2019
5
circuits of the vibrator B are joined and integrated on the back face of each other, and an audio
signal supplied to an electrical input terminal TA such as sound is supplied to the input terminal
24 of the speaker unit A via one power amplifier 26.
The speaker unit A has power generation means such as a power generation coil for driving the
vibrator B, which will be described later.
[0022]
Although not shown, an output from a power generation coil described later is connected to a
vibrator output terminal 28 provided in the speaker unit A.
Thus, the vibrator output terminal 28 and the input terminal 25 connected to a drive coil, which
will be described later, of the vibrator B are connected via a wire.
[0023]
By supplying an audio signal to the electric input terminal TA in the above-described
configuration, the vibrator B is given a driving force in the -F direction with respect to the driving
force in the F direction of the speaker unit A, and the respective driving forces F and- Reaction of
F-F 'and F' canceled each other to prevent rocking or movement of the small and lightweight
cabinet 21 and to increase the radiation power in the bass from the speaker unit A by one power
amplifier of the speaker device Can be obtained by driving the
[0024]
FIG. 2 is a block diagram showing an example of the speaker device according to the present
invention, and a speaker to be described later is attached to a speaker mounting hole 29a of the
baffle board 22 fixed on the front surface of a small lightweight cabinet 21 made of synthetic
resin or the like. The unit A is attached, the magnet of the second magnetic circuit 30 of the
vibrator B described later is attached to the back of the yoke of the first magnetic circuit 29
constituting the speaker unit A, and the speaker unit A and the vibrator B is integrated so that
the diaphragms face in the opposite direction to each other, and a speaker device is configured.
[0025]
The lower sides of the yokes of the first and second magnetic circuits 29 and 30 of the speaker
10-04-2019
6
unit A and the vibrator B are fixed to each other via an adhesive, or a magnet is attached to one
of the yokes as shown in FIG. It is made to join via an adhesive.
[0026]
Further, the cabinet 21 of this example radiates the outside of the cabinet 21 by inverting the
phase of the sound from the back of the speaker unit A and the sound pressure from the vibrator
B in the same plane as the speaker mounting hole 29a of the baffle board 22. An opening for
forming an opening and a duct 23 are formed to form a phase-reversal bath reflex cabinet, and
the bottom of the cabinet 21 is placed on a floor or a desk.
[0027]
Further, an acoustic signal is supplied to the speaker unit A via the power amplifier 26 to the
input terminal TA attached to the back plate 21 b of the cabinet 21.
[0028]
1 and 2, if a sound signal is supplied to the input terminal TA, the force of F = m0 α0 works as
shown by the arrows in FIGS. 1 and 2 in the speaker unit A. Similarly, a force of -F = mk αk acts
on the vibrator B, where m0 and mk are equivalent masses of the speaker unit A and the vibrator
B, and α0 and αk are the speaker unit A and the vibrator B. Indicates the acceleration of the
diaphragm.
[0029]
As described above, when the speaker unit A and the vibrator B are driven, the force in the F
direction of the speaker unit A acts in the same manner as the force of -F in the vibrator B. If
these forces F and -F are equal to each other, the reaction force F 'of the vibrator B in the -F
direction acts to cancel the reaction force F in the F direction of the speaker unit A. Swing of the
cabinet 21 is prevented.
[0030]
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).
[0031]
Here, WE is an audio signal input applied to the speaker unit A or the exciter B, Bg is the
magnetic flux density of the gap of the magnetic circuit, Vv is the effective volume of the voice
10-04-2019
7
coil, δ is the resistivity of the material of the voice coil, Q is the resonance sharpness of the
speaker unit A or the vibrator B, and 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 The force F = -F can be
selected under various conditions.
[0032]
Also, since a power generation mechanism is provided in the speaker unit A to drive the drive
coil of the vibrator B, the speaker unit A and the vibrator B can be driven by one power amplifier.
The small and light cabinet 21 can increase the radiation power of the sound of the speaker unit,
and in particular, can enhance the radiation power of the bass and can improve the sound quality
of the speaker device.
[0033]
An example of the configuration of the vibration exciter B used in the present invention will be
described with reference to FIGS. 3 and 4.
In FIG. 3, the vibrator B of this example is made of a disk-shaped plate material, and a stepped
portion is formed concentrically so as to surround the center pole 34a of a columnar shape and
erected in the center. A yoke 34 having an inverted T-shaped cross section in which the 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. And a ringshaped plate 31 joined 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 constitute a second
magnetic circuit 30 of the metal part. Be done.
[0034]
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.
[0035]
A corrugated concentric damper 39 is bonded between the outer diameter of the upper end of
10-04-2019
8
the voice coil bobbin 38 and the bottom of the frame 37 with an adhesive or the like, and the
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.
[0036]
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.
[0037]
A lead wire is drawn from the voice coil 38a, connected to the input terminal 25 through the
tinsel wire 46, and an electrical signal is supplied to the voice coil 38a through the input terminal
25.
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.
In the speaker device shown in FIG. 3, the exciter B may be formed by winding the magnetizing
direction of the magnet of the speaker unit A and the winding direction of the voice coil 38a in
the same direction.
[0038]
FIG. 4 shows another example of the configuration of the vibrator of the present invention, and
the parts corresponding to those of FIG.
[0039]
In FIG. 4, the configuration up to the magnetic circuit and the air-permeable lower damper 39a is
the same as FIG. 3, but the inner diameter of the ring-shaped upper waveform damper 39b is
joined to the upper outer diameter of the voice coil bobbin 38 to surround the voice coil bobbin
10-04-2019
9
38. The weight 49 for adding an effective mass is disposed on the upper damper 39b, and the
upper damper 39b is formed of cloth or the like between the maximum outer diameter opening
of the frame 37 and the outer diameter of the voice coil bobbin 38 Arrange 39b.
The outer diameter portion of the upper damper 39b is fixed to the frame 37 via the arrow 42,
and the upper damper 39b and the input terminal 25 are connected via the tinsel wire 46, and
the tinsel wire 46 and the voice coil 38a are connected. There is.
In this configuration, the upper damper 39b constitutes the diaphragm 7B but no sound is
emitted.
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.
[0040]
The vibrators disposed opposite to each other on the back of the speaker unit A of FIG. 2 may
have the configurations shown in FIGS. 3 and 4 described above, and in the case of FIG. A
vibrator (electric and vibration transducer) B in which the disk portion of the yoke is removed is
used.
[0041]
Furthermore, the configuration of the speaker unit A with a power generation mechanism used in
FIG. 2 will be described using FIGS. 5 and 6.
In FIG. 5, the yoke 50 is formed to have a substantially E-shaped cross section, and a peripheral
edge portion is formed in a cup shape, and a cylindrical center pole portion 51 is provided
upright at a disc-like central portion.
An adhesive is applied on the peripheral portion of the yoke 50 and the ring-shaped lower plate
52 is joined to the center pole 51 via a gauge, whereby the inner diameter of the lower plate 52
and the outer diameter of the center pole 51 are separated. Form a second magnetic gap 57.
10-04-2019
10
[0042]
In the lower plate 52, a stepped portion concentric with the central hole to be the magnet guide
53 is formed, and N.V. The inner diameter portion of the magnetized outer magnet 54 is fitted to
the step portion of the magnet guide 53 and is bonded to the upper side of the lower plate 52 via
an adhesive.
[0043]
The height of the center pole portion 51 of the yoke 50 is the height up to the upper surface of
the lower plate 52. The diameter of the center pole portion 51 is the same as the diameter of the
center pole portion 51. A columnar inner magnet 55 magnetized to N is bonded to the top
surface of the center pole portion 51 with an adhesive or the like.
[0044]
The lower surface of the upper plate 56 is joined to the upper surface of the outer magnet 54
while the inner diameter of the upper plate 56 is fitted to the outer diameter of the guide
inserted into the inner magnet 55 on the upper surface of the outer magnet 54 A disc-shaped
pole piece 58 is joined to the upper surface of the first magnetic gap 59, and a first magnetic gap
59 is formed between the outer diameter of the pole piece 58 and the inner diameter of the
upper plate 56.
[0045]
On the upper side of the upper plate 56, a funnel-shaped steel frame 60 is joined with a screw or
an adhesive or the like to form a metal portion of the first magnetic circuit 29.
[0046]
Next, kraft paper or the like is inserted into the inner magnet 55 and the center pole 51, and the
power generation coil 62 is wound around the tip of the coil bobbin 61 having a length reaching
the second magnetic gap 57 through the first magnetic gap 59. The inner diameter of the voice
coil bobbin 61 is made of kraft paper by winding the voice coil 63 for the speaker unit so as to
be located in the second magnetic gap 57 and turning the voice coil 63 for the speaker unit into
the first magnetic gap 59. Insert into the outer diameter.
[0047]
A damper 64 having a corrugated ring shape in cross section is joined between the bottom of the
frame 60 and the outer diameter of the voice coil bobbin 61 via an adhesive, and a funnel shaped
10-04-2019
11
diaphragm 65 having an edge 66 formed on the outer periphery The voice coil bobbin 61 is held
swingably in the vertical direction in FIG. 5 by being joined between the upper outer diameter
portion 61 and the maximum diameter opening of the frame 60 via the arrow 67.
[0048]
At this point, the kraft paper is removed from between the inner diameter of the center pole 51
and the voice coil bobbin 61, and the dome-shaped cap 68 for dust is joined so as to close the
opening of the voice coil bobbin 61. 69 a is connected to the input terminal 24, and the tinsel
wire 69 b connected to the generating coil 62 is connected to the output terminal 28.
[0049]
In the speaker unit A with the power generation function described above, the voice coil 63 is
supplied from the input terminal 24 in the magnetic flux from the N pole side of the upper plate
56 to the S pole side of the pole piece 58 in the first magnetic gap 59. Sound signal flows into the
voice coil 63 and swings up and down according to the strength of the sound signal, whereby the
vibration system including the voice coil bobbin 61, the damper 64 and the diaphragm 65 swings
up and down in FIG. Do.
Therefore, in the second magnetic gap 57, the magnetic flux is directed from the N pole side of
the center pole portion 51 to the S pole side of the lower plate 52 in the opposite direction to the
first magnetic gap portion 59. An electromotive force is generated in the generating coil 62 by
cutting off the magnetic flux according to the up and down rocking, and is supplied to the output
terminal 28.
[0050]
If the input impedance ZinG on the generating coil 62 side is made larger than the input
impedance ZinV of the voice coil 61 described above, for example, ZinV on the voice coil side is
8Ω, ZinG is 32Ω, etc., and ampere turns of the generating coil 62 are sufficient With this power
generation output, the drive coil 38a of the vibrator B can be sufficiently driven without using a
power amplifier.
[0051]
The lower end of the yoke 50 in FIG. 5 has a polarity opposite to the polarity of the outer magnet
54 as shown by the alternate long and short dash line if necessary, or via a canceling magnet 70
10-04-2019
12
magnetized with SN in the thickness direction As shown in FIG. 2, the vibrator B and the vibrator
B may be integrated back to back without intervention of the cancel magnet 70.
[0052]
Of course, it may be attached to the inside of the back plate 21b of the cabinet 21 with the
opening (the diaphragm 7B or the damper 16 or the like) side of the vibrator B facing away from
the speaker unit A.
[0053]
FIG. 6 is a cross-sectional view showing another configuration of the speaker unit with a power
generation function of the present invention, and the corresponding parts to FIG.
[0054]
The yoke 50 of FIG. 6 extends the center pole 51 embedded in the center of the disk-like portion
to the first magnetic gap 51 position, and the inner magnet 55 and pole piece on the center pole
51 used in FIG. 58 is removed.
[0055]
In the case of FIG. 6, the voice coil 63 in the first magnetic gap 59 cuts the magnetic flux in the
magnetic flux φ 0 directed from the N pole of the upper plate 56 to the S pole of the center pole
51 but the second magnetic gap In 57, the center pole 51 facing the S pole of the lower plate 52
is the N pole, and the magnetic flux φ 0 from the N pole to the S pole in the opposite direction to
the first magnetic gap 59 is provided. It can generate electricity.
[0056]
Although the power generation coil 62 shown in FIGS. 5 and 6 described above has been
described as a moving coil type configuration, the power generation coil 62 is provided on the
lower plate 52 side, and a ring iron or the like is fitted to the tip of the voice coil bobbin 61
Obviously, it may be a fixed moving iron type power generation mechanism.
[0057]
FIG. 7 is a cross-sectional view showing another example of the speaker apparatus according to
the present invention, which is an example using the one described in FIG. 3 as the vibrator B. Of
10-04-2019
13
course, the vibrator used in FIGS. B can also be used.
As a speaker unit A with a power generation mechanism, the speaker unit A of FIG. 8 or 9 is used.
[0058]
In the configuration of FIG. 8, the same reference numerals are given to corresponding parts to
FIG. 6 and the duplicate description is omitted, but in FIG. 8 the generating coil 62 is brought
into the first magnetic gap 59 and the voice for the speaker The coil 63 is brought into the
second magnetic gap 57, and the voice coil bobbin 61 is swingably held by the double damper of
the upper and lower dampers 64a and 64b and the lower end of the lower plate 52 and the disk
shape An outer second magnet 54b magnetized with SN in the thickness direction opposite to the
outer first magnet 59a is joined between the yokes 50 with an adhesive or the like, and the outer
second magnet 59b is a magnet formed on the disk-like yoke 50 The ring-shaped inner diameter
portion is fitted to the guide 71.
If necessary, as shown in FIG. 7, a cancel magnet 70 magnetized in the thickness direction
opposite to the outer second magnet 59b may be joined to the lower surface of the yoke.
[0059]
In the configuration of FIG. 8, the generating coil 62 disposed in the first magnetic gap 59 is
directed from the top plate 56 of the N pole to the center pole 51 of the S pole by the magnetic
flux φ1 formed by the first magnet 54a. An electromotive force is induced therein, and the voice
coil 63 disposed in the second magnetic gap 57 is driven by the magnetic flux .phi.2 formed by
the second magnet 54b.
In the case of this configuration, the magnetic flux leaking to the vicinity of the lower plate 52 is
effectively canceled by the first and second magnets.
Further, by using a double damper, it is possible to sufficiently hold a large equivalent mass of a
voice coil or the like extended long downward.
10-04-2019
14
[0060]
The example of FIG. 9 uses the first and second outer magnets 54a and 54b similarly to FIG. 8,
and further cuts the center pole portion 51 at the position of the lower plate 52 similarly to FIG.
The magnet 52 and the pole piece 58 are provided, and the generating coil 62 is disposed in the
first magnetic gap 59.
[0061]
Also in the operation in the case of the configuration of FIG. 9, the voice coil placed in the second
magnetic gap 57 swings in the magnetic flux from the center pole 51 toward the lower plate 52
and The generating coil 62 disposed at the top is moved up and down by the voice coil in the
magnetic flux from the inner periphery of the upper plate 56 of the N pole to the outer periphery
of the pole piece 58 of the S pole to induce an electromotive force. Voltage is supplied to the
drive coil (voice coil) 47 of the vibrator B.
[0062]
FIG. 10 shows another configuration of the speaker device according to the present invention.
The vibrator used in FIG. 3 is used.
As the speaker unit A, the one shown in FIG. 11 or 12 is used.
The vibration holding system of this example is configured as a double damper as in FIG. 9, and
the magnetic circuit constituting the second magnetic gap portion 57 is the inner diameter
portion of the outer magnet 54 and the outer diameter portion of the center pole portion 51. A
ring-shaped inner magnet 74 of strong magnetic force such as samarium cobalt is fitted and
joined to a magnet guide 71 formed on the disk upper portion of the yoke 50, and a concentric
plate 75 is adhesively mounted on the upper portion of the inner magnet 74. It is made to join
via.
[0063]
12, an outer magnet 54 and a ring-shaped cancel magnet 70 magnetized in the opposite
direction in the thickness direction are joined to the lower surface of the yoke 50 of the speaker
unit A having the configuration of FIG. The first magnetic circuit is covered with a shield cover
10-04-2019
15
77, and an opening 76 or the like is formed on the bottom of the shield cover 77 to reduce the
leakage flux and to radiate the stiffness of the air and to radiate the lowest resonance frequency
in the low region. It is made adjustable.
[0064]
FIG. 13 shows still another example of the speaker apparatus according to the present invention,
in which the vibrator B described in FIG. 3 is used, and one magnetic circuit is used as the
speaker unit as shown in FIG. .
[0065]
FIG. 14 has a magnetic circuit similar to that of a normal speaker unit, and the generating coil 57
is wound on the upper side of the voice coil 63 disposed in the first magnetic gap 59 to form a
first magnetic gap. This is a case where the voice coil 63 and the power generation coil 57 are
made to swing in the portion 59.
[0066]
According to the speaker apparatus of the present invention, since the speaker unit and the
vibrator are driven in the opposite direction to each other, the reaction force of the speaker unit
can be canceled or reduced. Since a small and light cabinet is not moved and the power
generation function for driving the vibrator is built in the speaker unit, only one power amplifier
can be used to drive the vibrator. It is possible to construct a speaker device economically and to
increase the low-range radiation power from the speaker unit.
[0067]
Brief description of the drawings
[0068]
1 is a principle configuration diagram of the speaker device of the present invention.
[0069]
2 is a cross-sectional view showing an example of the speaker device of the present invention.
[0070]
3 is a cross-sectional view showing an example of a vibrator used for the speaker device of the
10-04-2019
16
present invention.
[0071]
4 is a cross-sectional view showing another example of a vibrator used for the speaker device of
the present invention.
[0072]
5 is a cross-sectional view (I) of the speaker unit with a power generation function of the present
invention.
[0073]
6 is a cross-sectional view (II) of the speaker unit with a power generation function of the present
invention.
[0074]
7 is a cross-sectional view showing another example of the speaker device of the present
invention.
[0075]
8 is a cross-sectional view (III) of the speaker unit with a power generation function of the
present invention.
[0076]
9 is a cross-sectional view (IV) of the speaker unit with a power generation function of the
present invention.
[0077]
10 is a cross-sectional view (I) showing still another example of the speaker device of the present
invention.
[0078]
11 is a cross-sectional view (V) of the speaker unit with a power generation function of the
present invention.
10-04-2019
17
[0079]
12 is a cross-sectional view (VI) of the speaker unit with a power generation function of the
present invention.
[0080]
13 is a cross-sectional view (II) showing still another example of the speaker device of the
present invention.
[0081]
14 is a cross-sectional view (VII) of the speaker unit with a power generation function of the
present invention.
[0082]
15 is a partial cross-sectional view of the conventional speaker device.
[0083]
16 is a principle configuration diagram of a conventional speaker device.
[0084]
Explanation of sign
[0085]
A: Speaker unit B: Vibrator (electric and vibration transducer) 21 Cabinet: 22 Puffle board 23.
Duct 62: Generator coil
10-04-2019
18
Документ
Категория
Без категории
Просмотров
0
Размер файла
30 Кб
Теги
description, jph1146396
1/--страниц
Пожаловаться на содержимое документа