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JPH11220785

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH11220785
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device, and more particularly, a vibration applied to a panel-like vibrator by a vibration
applied from a driver unit based on a reproduction input signal causes partial bending operation
to emit reproduction output. The present invention relates to a panel type speaker device
configured to make sound.
[0002]
2. Description of the Related Art A cone type dynamic speaker and a horn type dynamic speaker
are generally known as a speaker device. For example, a cone-type dynamic speaker includes a
diaphragm formed in a conical shape, a driver unit for driving the diaphragm, a frame for
supporting the outer peripheral edge of the diaphragm, and a cabinet or the like that
accommodates these members. It is comprised by the member. The driver unit is constituted by
members such as a voice coil, a pole, a plate, a magnet, a damper and a center cap.
[0003]
The diaphragm is formed in a basic shape of the above-described conical shape by a lightweight
material having a large internal loss, and the driver unit is disposed at the central portion thereof.
Generally, the thickness of the diaphragm is gradually reduced from the inner peripheral portion
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toward the outer peripheral portion, and the outer peripheral edge portion is supported by the
frame over the entire circumference via arrows. The frame couples the diaphragm and the driver,
and also plays a role of protecting the diaphragm. The frame is generally formed with a notch
window so that the diaphragm is not affected by the reaction due to its vibration operation. The
arrows act to hold the outer peripheral edge of the diaphragm and to prevent contact with the
mounting portion of the cabinet when the diaphragm vibrates.
[0004]
On the other hand, the horn type dynamic speaker is such that the vibration sound of the
diaphragm driven by the voice coil is enlarged and emitted by the horn, and the above-mentioned
cone type dynamic speaker has a basic configuration other than having the horn. It is considered
equivalent to a speaker. That is, also in the horn type dynamic speaker, the magnet, the pole
integrally assembled at the tip thereof, the yoke surrounding the periphery of the pole, and the
plate having the opening facing the pole and assembled to the yoke The driver unit is configured,
and the diaphragm is vibrated by the driver unit.
[0005]
The diaphragm is formed in a spherical shape by a light metal such as aluminum or a synthetic
resin. The diaphragm is connected to the plate at its outer peripheral edge so as to face the pole
by closing the opening. The diaphragm is smaller than the diaphragm of the above-mentioned
cone type dynamic speaker and has high mechanical rigidity because the resonance of the
vibration system may be in the approximately central region of the reproduction band. Therefore,
the diaphragm is coupled to the plate without the damper, and its periphery is vibrated by the
driver unit. In other words, also in the horn type dynamic speaker, the diaphragm thereof is
supported with its outer peripheral portion fixed as in the diaphragm of the cone type dynamic
speaker.
[0006]
In the meantime, many attempts have been made to realize a so-called panel type speaker device
which is thin without requiring a box or the like and can be installed at an arbitrary position.
However, none of these attempts have led to the realization of an ideal panel-type speaker device
due to technical limitations, acoustic performance limitations, etc. Many of these attempts have
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been based on the cone type dynamic speaker and the horn type dynamic speaker described
above.
[0007]
As a thin speaker device, for example, a capacitor-type speaker in which a panel-shaped
diaphragm is disposed opposite to a fixed pole with a minute gap is known. In a capacitor type
speaker, generally, a thin metal film is formed on a diaphragm and a DC bias voltage of several
hundreds volts is applied between the diaphragm and a fixed electrode. When a reproduction
signal is input to the fixed pole, the diaphragm vibrates due to a change in magnetic attraction
with the fixed pole. In addition, as a capacitor type speaker, a push-pull type speaker adapted to
correspond to the whole band is also provided by arranging a fixed pole with a diaphragm
interposed therebetween.
[0008]
As described above, it is necessary to apply a voltage of several hundred volts to the sound
output part as described above, so it is difficult to freely install it anywhere, and it is stable due to
changes in temperature and humidity conditions. It has the problem of low sex. In addition, the
capacitor-type speaker has a problem that the maximum undistorted output sound pressure level
obtained for the input voltage is smaller than that of the above-described dynamic speaker device
because the input voltage is regulated to the DC bias voltage. Furthermore, the capacitor-type
speaker has various problems such as an increase in size of the diaphragm in order to secure
stable frequency characteristics in the entire band.
[0009]
In a speaker device, it is generally considered that when a reproduction input signal is supplied, a
diaphragm acts as a piston by a driver unit to perform output reproduction. Therefore, also in the
panel type speaker device, an attempt has been made to manufacture a high-precision flat
diaphragm which operates in the same manner as the diaphragm of the conventional speaker
device described above by the electromagnetic drive method or electrostatic drive method. For
example, in the electrostatic drive type diaphragm, the outer peripheral portion is supported with
a predetermined tension, and when the driving force from the driver unit is applied, waves are
continuously generated concentrically from the driving position. . Such diaphragms must solve
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various problems resulting from large area piston motion that results in sound concentration and
uncontrollable vibrations by operating as a large single phase diaphragm.
[0010]
On the other hand, as a panel type speaker device, a speaker device having a novel panel
structure in which a diaphragm is driven by a driver unit based on bending wave theory has been
proposed. In this novel panel-type speaker device, the diaphragm is constituted by a rigid panel
structure having relatively high mechanical rigidity, and when a driving force is applied from the
driver unit, a complex vibration mode is generated over the entire surface of the diaphragm. Be
done. The vibration mode is the most complex and densely-packed waveform structure uniformly
distributed over the operating frequency range of the diaphragm. The novel panel-type
loudspeaker device is characterized by the analysis of the physical properties of the bending
wave with respect to a diaphragm of finite size, the speed-frequency characteristic of the wave
and the driving point impedance characteristic.
[0011]
The novel panel-type speaker device uses a flexural rigidity diaphragm whose parameter is
optimized according to the intended application, and can operate up to the lower frequency band
of the coincident frequency. In the novel panel-type speaker device, in order to secure a bending
mode of maximum density from the diaphragm in general, the vicinity of the center point of the
diaphragm is driven by the driver unit. The diaphragm has been demonstrated by mathematical
modeling tools with specific aspect ratios that give uniform mode density by finite element
analysis. In addition, in the novel panel type speaker device, the supply position of the driving
force to the diaphragm which achieves the best mode uniformity is determined by Fourier type
analysis. And, in the novel panel type speaker device, although expansion of Fourier type analysis
causes some loss in the high frequency band, it is also possible to drive a diaphragm having a
larger area. The diaphragm is expressed by an equation of bending stiffness which approximates
the bending equation of a more general static beam by taking the zero frequency limit of the
wave function.
[0012]
The novel panel type speaker device is a factor that defines the bending operation of the
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diaphragm, ie, area density, bending stiffness, geometric dimension (outer dimension), surface
area, position of driving point, and parameters of drive unit, core shear module , Internal loss, or
parameters of the supporting method of the diaphragm are set optimally. In a general speaker
device, the rear sound, called a dipole, has an antiphase with the sound of the front, so a large
baffle plate or enclosure is required to prevent cancellation of acoustic energy in the middle to
low frequency bands. Do. On the other hand, in the novel panel type speaker device, the radiation
of the rear sound, which is referred to as bipolar, is added to the sound of the front, so that the
efficiency can be improved and the baffle plate and the enclosure are eliminated, making the size
smaller and thinner Is taken.
[0013]
The novel panel-type speaker device enables full-range output reproduction with a single
diaphragm driven by a single-element transducer. The novel panel-type speaker device can
obtain flat frequency characteristics equivalent to those of the conventional speaker device by
selecting the appropriate material of the diaphragm and the configuration adapted to the
transducer.
[0014]
The novel panel-type speaker device not only achieves compatibility with the existing amplifier
by making the sensitivity and the electrical load equal to those of the conventional speaker
device, but also makes it possible to use an electrodynamic driver unit and a piezoelectric driver
unit. Application is made possible, and very broad sound field radiation patterns as well as bidirectional radiation patterns are obtained. The novel panel-type loudspeaker system has the
property of converting the mechanical energy to the acoustic energy almost 100% and the
property of non-directional radiation independent of frequency, ie, large uniformity of sound
power for each frequency. ing. The novel panel type speaker device is characterized in that the
attenuation of the sound power due to the condition of distance is small, and has other various
characteristics due to its novel configuration.
[0015]
As described above, in the novel panel-type speaker device, the resonance frequency in the low
frequency range is lowered to significantly improve the frequency response characteristics, but
in the high frequency range, the frequency response characteristics are improved as the
frequency range decreases. There is a feature that uniform flat characteristics can not be
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obtained without obtaining.
[0016]
The present invention is based on a novel panel-type speaker device based on bending wave
theory that drives a diaphragm based on a reproduction input signal by the above-mentioned
driver unit to perform output reproduction, and is based on a low frequency band to a high
frequency band. It is proposed for the purpose of providing a panel type speaker device which
obtains wide frequency response characteristics.
[0017]
SUMMARY OF THE INVENTION A panel type speaker device according to the present invention
for achieving this object is a panel-like vibrator which is formed in a rigid panel shape and
supported in a substantially unconstrained state at its outer peripheral portion. And a driver unit
that is supported by being attached to one main surface of the vibrator and that constitutes a
vibration source.
The panel type speaker device is configured such that the vibration body can apply a vibration
based on the reproduction input signal at at least two parts from the driver unit.
[0018]
Further, the panel type speaker device according to the present invention is provided with at
least two or more driver units.
Furthermore, in the panel-type speaker device, the first driver unit attached via the first adapter
member configured as a ring-shaped bonding surface having a predetermined inner diameter
and the bonding portion to the vibrating body, and the bonding portion to the vibrating body And
a second driver unit attached via a second adapter member configured as a plate-like joint
surface having a predetermined area.
[0019]
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According to the panel-type speaker device according to the present invention configured as
described above, the driver unit generates a partial bending operation on the vibrator based on
the reproduction input signal, and the reproduction of the reproduction output is performed.
Since the panel type speaker device performs free vibration with the outer peripheral portion in a
non-constrained state, the reproduction output with good sound quality in the low frequency
band is emitted at a sufficient volume without the need for a resonance box or an acoustic tube.
In the panel-type speaker device, since the driver unit applies vibrations to the diaphragm from a
plurality of locations, the appearance of a large number of sound sources is generated by the
characteristics of the frequency response characteristic based on each vibrating portion.
Therefore, in the panel type speaker device, the frequency response characteristic is improved in
a wide frequency band from the low frequency band to the high frequency band, and a wide
directivity in the high frequency band is secured.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described in detail with reference to the drawings. The panel-type speaker device 1 shown in the
figure as an embodiment of the present invention has the diaphragm 2 formed in a rectangular
panel shape with one main surface as the sound output surface 2 a and the other main surface 2
b of the diaphragm 2. The first driver unit 3 and the second driver unit 4 joined and fixed as will
be described later in detail, and the support bracket 5 supporting the driver units 3 and 4 and
the stand member 6.
[0021]
The diaphragm 2 is formed of a styrene resin into a flat panel having an outer size of
approximately B4 size (25.7 mm in length × 36.4 mm in width) and a thickness of 3 mm. The
diaphragm 2 is driven by the first driver unit 3 and the second driver unit 4 as described later.
Unlike the diaphragm of the conventional speaker device, the diaphragm 2 is configured as a
non-restrained rigid panel-like member that is not supported in a state where its outer peripheral
portion 2c is fixed by a member such as a frame. As described above, the diaphragm 2 is
configured such that one main surface is the sound emitting surface 2a and the other main
surface is the driven surface 2b. Of course, although the above-mentioned rectangular shape is
preferable as the diaphragm 2, it may be, for example, circular or elliptical.
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[0022]
As shown in FIGS. 1 and 2, the first and second driver units 3 and 4 are supported by the support
bracket 5 with the driven surface 2b spaced apart in the vertical direction, as shown in FIGS.
Bonded and fixed. The first driver unit 3 and the second driver unit 4 each use a dynamic driver
unit provided in a conventional dynamic speaker.
[0023]
As shown in FIG. 3, the first driver unit 3 includes a voice coil 7, a magnetic circuit 8 for driving
the voice coil 7 based on a reproduction input signal, and a wire for receiving supply of the
reproduction input signal from an input unit (not shown). And so on. The voice coil 7 comprises a
bobbin 9 and a coil portion 10 formed by providing a winding wire on the outer peripheral
portion of the bobbin 9.
[0024]
The magnetic circuit 8 is constituted by members such as the center pole 11, the magnet 12, the
plate 13, the auxiliary ring 14, the damper 15, the first adapter member 16 and the like. The
center pole 11 includes a core portion 11a and a large diameter flange portion 11b integrally
formed with the core portion 11a. The magnet 12 is formed in a ring shape having a central hole
12 a slightly larger in diameter than the outer diameter of the core portion 11 a of the center
pole 11. The magnet 12 is combined with the center pole 11 in a state in which the core portion
11 a penetrates the central hole 12 a and is stacked on the flange portion 11 b.
[0025]
The plate 13 is also formed in a ring shape having a central hole 13a slightly larger in diameter
than the outer diameter of the core portion 11a of the center pole 11, and is combined with the
magnet 12 in a laminated state with the central axis aligned. The plate 13 makes the core portion
11 a of the center pole 11 face the center hole 13 a in a state of being combined with the magnet
12. An auxiliary ring 14 is fitted to the outer periphery of the plate 13.
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[0026]
In the first driver unit 3, the coil portion 10 is positioned in a cylindrical magnetic space portion
configured between the core portion 11 a of the center pole 11 and the center hole 12 a of the
magnet 12 and the center hole 13 a of the plate 13. Thus, the voice coil 7 and the magnetic
circuit unit 8 are combined. The first driver unit 3 connects the bobbin 9 of the voice coil 7 and
the auxiliary ring 14 of the magnetic circuit unit 8 by the damper 15 so that the voice coil 7 can
move in the axial direction relative to the magnetic circuit unit 8. Be supported.
[0027]
The first adapter member 16 is formed in a ring shape having an outer diameter substantially
equal to the inner diameter of the bobbin 9, and one end side thereof is joined to the opening of
the bobbin 9. The first driver unit 3 is combined with the diaphragm 2 by the first adapter
member 16 being joined at the other end to the driven surface 2 b of the diaphragm 2. In other
words, the first driver unit 3 is combined with the diaphragm 2 through the first adapter member
16 so that the joint portion 18 has a ring shape. Further, the first driver unit 3 is fixed to the
support bracket 5 via a set screw 17 which is screwed into a screw hole 11 c provided on the
bottom surface of the flange portion 11 b of the center pole 11. The first driver unit 3 has a
maximum diameter of about 35 mm for the auxiliary ring 14 with the largest diameter, and a
thickness of about 20 mm for the bottom surface of the center pole 11 and the tip of the first
adapter member 16. Construct 1 small and thin.
[0028]
In the first driver unit 3 configured as described above, when the reproduction input signal
(audio current) is supplied to the voice coil 7 from the reproduction input signal circuit unit (not
shown), the voice coil 7 and the magnetic circuit unit 8 The diaphragm 2 is driven by the
magnetic force generated between them. The diaphragm 2 receives a driving force in a direction
orthogonal to the main surface from the first driver unit 3 with the junction 18 with the first
adapter member 16 as a driving point, and a partial bending operation occurs, thereby
reproducing output Emit noise.
[0029]
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The second driver unit 4 is the same as the components of the first driver unit 3 except for the
second adapter member 19 except for the second adapter unit 19, and the detailed description
thereof will be omitted by giving the same reference numerals. Do. As shown in FIG. 4, the
second adapter member 19 is formed in a substantially conical shape in which the disk-like base
19a has an outer diameter substantially equal to the inner diameter of the bobbin 9 and the
diameter of the tip 19b is gradually smaller. Become. The second adapter member 19 is
combined with the diaphragm 2 by joining the base 19 a to the opening of the bobbin 9 and by
joining the tip 19 b to the driven surface 2 b of the diaphragm 2.
[0030]
As described above, since the first driver unit 3 is combined with the diaphragm 2 through the
first adapter member 16, as shown in FIG. 2, the joint portion 18 has a ring shape having a
predetermined inner diameter. It is constituted and presented. On the other hand, since the
second driver unit 4 is combined with the diaphragm 2 via the second adapter member 19 as
described above, as shown in FIG. It is configured to have. The second driver unit 4 is located
below the above-described first driver unit 3 via a set screw 17 that is screwed into a screw hole
11 c provided on the bottom surface of the flange portion 11 a of the center pole 11. It is fixed to
the support bracket 5.
[0031]
The second driver unit 4 configured as described above receives the voice coil 7 and the
magnetic circuit unit 8 when the reproduction input signal (voice current) is supplied to the voice
coil 7 from the reproduction input signal circuit unit (not shown). The diaphragm 2 is driven by
the magnetic force generated between them. The diaphragm 2 receives a driving force in a
direction orthogonal to the main surface from the second driver unit 4 with the junction 20 with
the second adapter member 19 as a driving point, and a partial bending operation occurs, and
the reproduction output Emit noise.
[0032]
The support bracket 5 is swingably supported by the stand member 6 via a hinge mechanism 6a.
In the panel type speaker device 1, by adjusting the fixing angle of the support bracket 5 with
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respect to the stand member 6, the angle adjustment of the sound emitting surface 2 a of the
diaphragm 2 in the vertical direction can be made freely. In addition, by supporting the support
bracket 5 with respect to the stand member 6 via, for example, a universal joint mechanism, the
panel type speaker device 1 can adjust the angle of the diaphragm 2 not only vertically but also
horizontally. Ru.
[0033]
The reproduction input signal is supplied to the first driver unit 3 and the second driver unit 4
from the reproduction input signal circuit unit (not shown) to the panel type speaker device 1
configured as described above. FIG. 5 shows the output sound pressure level when the
reproduction input signal of the frequency f0 is independently supplied to the first driver unit 3
and the second driver unit 4 of the panel type speaker device 1 and driven independently. It is a
frequency response characteristic view showing the measured result. In the figure, the horizontal
axis represents the frequency f0 (Hz) of the reproduction input signal supplied, and the vertical
axis represents the measured frequency response characteristic value (output sound pressure 10
dB), and the line a driven the first driver unit 3 The frequency response characteristic value in
this case is the frequency response characteristic value when the line b drives the second driver
unit 4.
[0034]
As apparent from FIG. 5, the panel-type speaker device 1 has a second driver in comparison with
the case where the first driver unit 3 is driven alone for a reproduction input signal in a low
frequency band of 1000 Hz or less. When the unit 4 is driven alone, its response characteristics
become slightly lower. On the other hand, as is clear from the figure, the panel-type speaker
device 1 performs the second operation as compared with the case where the first driver unit 3 is
driven alone for the reproduction input signal in the middle to high frequency band of 1000 Hz
or more. When the driver unit 4 is driven alone, its response characteristic becomes a somewhat
larger value.
[0035]
In the first driver unit 3, as described above, since the bonding portion 18 has a ring shape with
respect to the diaphragm 2, the vibration operation for causing the diaphragm 2 to vibrate in its
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entirety and the internal region surrounded by the bonding portion 18 Generate a divided
vibration operation to vibrate the The divided vibration operation in the inner region of the joint
portion 18 causes a large amount of high frequency band components to be output from the
sound emission surface 2 a of the diaphragm 2, and thus a larger response to the high frequency
band reproduction input signal as described above. Get the characteristics. On the other hand,
since the second driver unit 4 vibrates the entire portion with the bonding portion 20 as a drive
source with respect to the diaphragm 2, the second driver unit 4 is large outside the bonding
portion 20 when the reproduction input signal in the high frequency band is supplied. The
response characteristic is slightly deteriorated compared to the case where the first driver unit 3
is driven because the vibration is difficult to transmit.
[0036]
The panel-type speaker device 1 includes the first driver unit 3 and the second driver unit 4
having the above-described characteristics, and simultaneously drives them to provide a second
response characteristic to the reproduction input signal in the low frequency band. The first
driver unit 3 is configured to be complemented by the characteristics of the driver unit 4 of FIG.
FIG. 6 shows the result of measuring the output sound pressure level when the reproduction
input signal of the frequency f0 is supplied to the first driver unit 3 and the second driver unit 4
of the panel type speaker device 1 and simultaneously driven. Is a frequency response
characteristic diagram showing In the figure, the horizontal axis is the frequency f0 (Hz) of the
reproduction input signal to be supplied, and the vertical axis is the measured frequency
response characteristic value (output sound pressure level 10 dB). Further, in the same figure,
the line c is the frequency response characteristic value of the front position with respect to the
sound emitting surface 2a of the diaphragm 2, and the line d is the frequency response of 30 °
position with respect to the It is a characteristic value, and the line e is a frequency response
characteristic value at a position of 60 ° with respect to the sound emission surface 2 a of the
diaphragm 2.
[0037]
As is clear from the figure, the panel type speaker device 1 enables high sensitivity reproduction
for reproduction input signals in a wide frequency band ranging from a low frequency band to a
high frequency band. That is, since the panel type speaker device 1 drives the diaphragm 2 by
the first driver unit 3 and the second driver unit 4, the above-described diaphragm as the
frequency of the reproduction input signal supplied becomes higher Since the divided vibration
operation in 2 becomes finer and more complex, it appears that a large number of sound sources
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exist, and the above-mentioned characteristic is obtained.
[0038]
The panel-type speaker device 1 drives the diaphragm 2 by the first driver unit 3 and the second
driver unit 4 to generate independent bending operations. In the panel-type speaker device 1, the
first driver unit 3 and the second driver unit 4 complement each other to adjust the frequency
band and the amplitude at which resonance occurs in the high frequency band, and the low-mid
range It is possible to widen the frequency response characteristic in the high frequency band to
the high frequency band by combining the characteristics of The panel type speaker device 1
does not drive the node position in each frequency band unless the node position is intentionally
set as the vibration position with respect to the diaphragm 2 for the first driver unit 3 and the
second driver unit 4 intentionally. . Therefore, in the panel-type speaker device 1, the first driver
unit 3 and the second driver unit 4 mutually complement the drive of the diaphragm 2 at the
node position in each frequency band, thereby achieving the frequency response characteristic.
The occurrence of sharp peaks and dips is suppressed.
[0039]
In the panel type speaker device 1, the directivity of the conventional cone type speaker device
becomes narrower as the frequency band thereof becomes higher, but the directivity in this high
frequency band is improved. Since the panel type speaker device 1 eliminates the need for a
resonance box, an acoustic tube, etc. as in the conventional speaker device as described above, it
constitutes a small and thin speaker device. Moreover, since the sound emitting surface 2a of the
diaphragm 2 is flat panel-like, the panel type speaker device 1 can expand its external shape or
surface design relatively freely, for example, Applications such as drawing a picture on the
surface 2a, holding a picture or picture, and projecting an appropriate figure are possible.
[0040]
Since the diaphragm 2 has a large vibration area, the panel type speaker device 1 enables higher
bass output as compared with the conventional speaker device having the driver unit 3 of the
same specification. In addition, panel type speaker device 1 eliminates the need for supporting
members such as arrows and frames for supporting outer peripheral portion 2 c of diaphragm 2
as in the conventional speaker device, so the number of parts is small and the assembly process
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can be performed. It is rationalized and costs can be reduced. Since the panel type speaker device
1 drives the diaphragm 2 by the first driver unit 3 and the second driver unit 4, the reproduction
output specific to the size of the diaphragm 2 and the material characteristics thereof is thin. It
emits a so-called "speech-free" reproduction output.
[0041]
In the panel-type speaker device 1, the diaphragm 2 is driven by the first driver unit 3 and the
second driver unit 4, so that the mechanical strength is improved and the sound quality of the
reproduction output is improved. That is, in the panel type speaker device 1, since the diaphragm
2 also has a mass itself, the joint portion 18 of the first driver unit 3 and the joint portion 20 of
the second driver unit 4 which drive the diaphragm 2 are also included. Mechanical load is
applied. The panel type speaker device 1 distributes the load due to the mass of the diaphragm 2
to each of the joint portions 18 and 20 at two places, thereby reducing the mechanical load and
durability. Be Further, in the panel type speaker device 1, the disadvantage that the vibration
form of the diaphragm 2 deviates from the linear motion due to the large load applied to the joint
portion and affects the reproduction behavior and the sound quality is reduced.
[0042]
Further, in the panel-type speaker device 1, by appropriately arranging the driver units 3 and 4,
the vibration mode of the specific frequency in the specific direction is suppressed, and
stabilization and improvement of the sound quality can be achieved. The panel-type speaker
device 1 can also be configured to promote a vibration mode of a specific frequency in a specific
direction by appropriately arranging the driver units 3 and 4.
[0043]
The panel type speaker device 1 may be provided with a mass component material formed of a
material which easily absorbs vibration of a lead material or the like in a tape shape, for example.
The mass component material is adhered to the diaphragm 2 over the entire circumference of
the outer peripheral portion 2c of the sound emitting surface 2a. As described above, the paneltype speaker device 1 is stable in the low frequency band so that the vibration is easily generated
in the outer peripheral portion 2c even in the low frequency band by the diaphragm 2 being in
the unconstrained state of the peripheral portion 2c. It is configured to be able to obtain a
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reproduced output. In the panel-type speaker device 1, a mass component material is provided
on the outer peripheral portion 2c to reduce the generation frequency of the vibration mode in
the low frequency band, thereby extending the reproduction effective band.
[0044]
The panel-type speaker device 1 mounts the driver units 3 and 4 to the diaphragm 2 via, for
example, mounting plates made of different materials integrated by insert molding when the
diaphragm 2 is molded. You may do so. When the panel type speaker device 1 is made of
different materials and driven by the driver units 3 and 4 by the action of the mounting plate, the
resonance frequencies of the high frequency band of the diaphragm 2 are respectively shifted. In
the panel-type speaker device 1, the resonance points of the driver units 3 and 4 are mutually
complemented thereby to improve the frequency characteristics in the high frequency band.
Further, in the panel-type speaker device 1, peak adjustment in an unnecessary high frequency
band can be achieved by appropriately adjusting each mounting plate.
[0045]
The panel type speaker device 1 performs switching operation of the phase of the reproduction
input signal in the input ON state together with the switching operation of ON / OFF of the input
of the reproduction input signal to the driver units 3 and 4. Alternatively, the sensitivity may be
adjusted individually by adjusting the level of the reproduction input signal to be input. In the
panel type speaker device 1, reproduction input signals having phase components required
thereby are supplied to the driver units 3 and 4, and the driver units 3 and 4 are operated
independently to drive the diaphragm 2 to reproduce Sound the output. The panel-type speaker
device 1 can obtain reproduced sound in which the sound field, the sound quality, and the like
are appropriately changed by eliminating the need for special circuit elements, switching devices,
and the like and by the extremely simple operation by the user.
[0046]
The panel type speaker device 1 divides the reproduction input signal into two frequency bands
by a band pass filter, performs phase adjustment and combines them, and then supplies the
driver units 3 and 4 to drive the diaphragm 2. You may The panel-type speaker device 1 is
configured to input the reproduction input signal of the in-phase component to all the driver
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units 3 and 4 in the low frequency band, for example, and to input the reproduction input signal
of the reverse phase component in the middle and high frequency band. . As in the case where
the mass component material is attached to the diaphragm 2, the panel type speaker device 1
generates a peak in the low frequency band, thereby improving the response characteristics, that
is, improving the sensitivity.
[0047]
The panel-type speaker device 1 is, for example, a reproduction input signal subjected to signal
processing such as separation of a specific frequency band that generates a dip portion or an
excessive peak by a filter having an inverse filter action of impulse response. , 4 may be
configured to be supplied. As a result, the panel type speaker device 1 emits the reproduced
output whose flattening of the reproduction frequency characteristic is achieved, or emits the
reproduced output in which only a specific frequency band is emphasized. . An appropriate
digital filter or analog filter is used in the panel type speaker device 1 so that not only separation
processing of a specific frequency band but also appropriate signal processing such as amplitude
and phase can be performed on the reproduction input signal. May be
[0048]
In addition, the panel type speaker device 1 may be configured by giving an appropriate delay
component coefficient to the filter. With this configuration, the sound wave wavefront of the
reproduction output emitted from the diaphragm 2 is controlled by this configuration, and the
main axis can be appropriately shifted from the front, so that the sound can be enhanced.
Furthermore, the panel type speaker device 1 may be configured by providing an appropriate
amplitude component to the filter. With such a configuration, the panel-type speaker device 1
can impart directivity in the same manner as the speaker array, and although the sound output
unit is configured by one diaphragm 2, it can be applied to a plurality of input sound sources. It
is possible to configure a speaker device system capable of directional control.
[0049]
The panel-type speaker device 1 vibrates in a specific frequency band by supplying the
reproduction input signals in opposite phases with each other to drive the driver units 3 and 4
arranged at geometrically symmetrical positions on the diaphragm 2. Regardless of the material
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of the plate 2, nodes of vibration can be forcibly generated at equally spaced positions of the
driver units 3 and 4. Therefore, in the panel-type speaker device 1, the sensitivity adjustment of
each sound range, the improvement of the reproduction frequency characteristic, the adjustment
of the sound field and the sound quality, and the like become possible by skillfully utilizing such
a phenomenon. Of course, the panel type speaker device 1 may perform signal processing of the
reproduction input signal by appropriately combining appropriate filters with the driver units 3
and 4.
[0050]
Although the panel type speaker device 1 described above includes the two driver units 3 and 4
and drives the diaphragm 2 based on the reproduction input signal to emit the reproduction
output, the present invention applies It is not limited to the configuration. Of course, depending
on the size of the diaphragm 2, it may be configured to be driven by a larger number of driver
units. In addition, although the panel type speaker device 1 includes the driver unit 3 having the
annular bonding portion 18 and the driver unit 4 having the bonding portion 20 of a
predetermined area, for example, the diaphragm 2 is formed by one driver unit. It may be made
to drive, and it may be made for junction part to be constituted by two points of a central part
and its perimeter.
[0051]
In addition, although the panel type speaker device 1 includes the driver unit configured
substantially equal to the dynamic driver unit provided in the conventional dynamic type speaker
device as described above, the present invention is limited to such a driver unit Of course not.
The driver unit may be any unit as long as it causes the diaphragm to perform a bending
operation by being supplied with a reproduction input signal. For example, a piezoelectric driver
unit provided in a conventional piezoelectric speaker device may be used.
[0052]
As described above in detail, according to the panel type speaker device according to the present
invention, the peripheral portion of the diaphragm formed in a panel shape having rigidity is
supported in a substantially unconstrained state, A driver unit is attached to the vibrator with a
ring-shaped joint portion and a joint portion having a predetermined area, and the driver unit
causes a partial bending operation of the vibrator based on the reproduction input signal. Since
the sound output of the reproduction output is performed, the characteristic of the frequency
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response characteristic based on each vibration generating unit generates a state having a large
number of sound sources apparently, and the frequency is wider from the low frequency band to
the high frequency band A small, thin, good-quality reproduction output with improved
frequency response characteristics in a wide band and wide directivity characteristics in a high
frequency band is ensured. It is possible to obtain a speaker device for.
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