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JPH01311799

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DESCRIPTION JPH01311799
[0001]
C. Industrial Field of Application] The present invention relates to an electroacoustic transducer 1
commonly referred to as a speaker of a sound I1 device, and more particularly to a speaker
suitable for emitting very low frequency sound. [Description of the Related Art] In general, as a
speaker for acoustic radiation, a 4I dynamic speaker as shown in FIG. 4 is used. That is, when a
strong magnetic field is produced across the voice coil VC by the magnet M and the yoke Y, and
an alternating current is supplied to the voice coil VC, the diaphragm B connected to the voice
coil moves with the voice film VC and an arrow The piston moves as shown in the figure and
emits sound waves. The movable part is held by the damper D, and forms a single vibration
system as a whole. According to this dynamic speaker, the frequency-sound pressure
characteristic as shown in FIG. 5 can be obtained when the electric input is constant, so it is
conventionally used for sound radiation conventionally. This characteristic is also the same for
other types of speakers. [Problems to be Solved by the Invention] However, as can be seen from
FIG. 5, since the electro-acoustic conversion efficiency drops sharply below the lowest resonance
frequency fo, the dynamic φ speaker described in the present invention has a frequency of 50
Hz or less. It is unsuitable for the emission of very low frequency sound. In order to lower the
lowest resonance frequency fo, it is conceivable to increase the wages of the vibration system or
to decrease the strength of the damper, but there is a limit naturally because the electroacoustic
conversion efficiency is lowered and the braking becomes defective. . In addition, even if it is
attempted to cover by increasing the electric input by an amount corresponding to the decrease
in efficiency, this is also limited because the voice coil generates heat. An object of the present
invention is to provide a speaker suitable for radiating an ultra-low frequency sound which is
generally considered to be difficult due to the intrinsic characteristics of the speaker. [Means for
Solving the Problems] A non-invented hydraulic drive speaker is a speaker configured to emit low
frequency sound by driving a diaphragm using a hydraulic drive. Specifically, the shell is
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sectioned back and forth by the movable body, and at least the rear side or the front side of the
movable body is a hydraulic pressure chamber for swinging the movable body according to a
signal, and the movable body is a diaphragm for sound emission In connection, it is configured to
emit low frequency sound from the diaphragm. And, if necessary, a hydraulic pressure sensor for
detecting the pressure in the hydraulic pressure chamber, or a movable body or a position sensor
for a part moving integrally with the movable body can be provided. The speaker drive device
according to the present invention is connected to a fluid pressure sensor for detecting the
pressure in the fluid pressure chamber of the fluid pressure driven speaker and to a fluid
pressure source for controlling the fluid pressure in the fluid pressure chamber of the fluid
pressure driven speaker. A fluid pressure controller and a control amplifier that controls the fluid
pressure controller according to a signal, and a detection signal from the fluid pressure sensor is
a feedback signal for improving controllability and preventing generation of noise due to
pressure fluctuation of the fluid source. As a configuration to input to the control amplifier.
In this configuration, the hydraulic drive speaker is further provided with a movable body or a
position sensor related to a part moving integrally with the movable body, and the response
direction and no signal 0 are obtained for the central position holding function of the movable
body. The detection signal from the position sensor can be input to the control amplifier as a
feedback signal. The fluid pressure source of the speaker drive device is preferably constituted
by a pump with low pulsation, an accumulator, and a pressure regulator. [Operation] This is a
speaker configured to emit sound in the low frequency range by driving the diaphragm using a
liquid pressure drive device, and the hydraulic system is not hydraulic because the lock source is
not electromagnetic force but hydraulic pressure. It is a low-sound speaker that can emit highpower radiation with an ultra-low opening noise by using the powerful driving force and braking
force possessed qualitatively. The movable body that divides the shell back and forth vibrates
when the hydraulic pressure of the hydraulic pressure chamber formed at least on the rear side
or the front side varies according to the signal, and is vibrated to the diaphragm for acoustic
radiation connected to the movable body The sound is transmitted, and low frequency sound is
emitted from the diaphragm. In this case, the movable body may be any of a diaphragm, a
bellows or a piston, and two hydraulic pressure chambers may be formed before and after the
movable body to vibrate the movable body in a differential pressure manner. In the configuration
of the speaker drive provided with a fluid pressure sensor that detects the pressure in the fluid
pressure chamber (differential pressure in the case of a two-chamber system), the detection
signal of the fluid pressure sensor is left as a feedback signal to the control amplifier The use
controllability is improved and the generation of noise due to pressure fluctuation of the liquid
source is suppressed. Furthermore, in the configuration of the speaker driving device provided
with the position sensor, the detection signal of the position sensor is fed back as a feedback
signal to the control amplifier, so that the response is improved by the displacement, speed,
acceleration, etc. The function of holding the center position of the movable body at the time of
no signal or drift compensation of a hydraulic pressure (differential pressure) sensor can be
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performed. In these speaker drive devices, for example, a pump with a low pulsation such as a
screw pump is used as a pump of a hydraulic pressure source, and by using an accumulator and
a throttling mechanism, the pulsation, particularly high frequency components are removed. be
able to. Embodiments of the present invention will be described below with reference to the
drawings. The hydraulic drive speaker and the speaker drive device shown in FIG. 1 are
composed of the following four parts. The first is the diaphragm 1 and a portion of the cabinet 2
for efficiently radiating the low frequency range sound. The second part is a portion including
the hydraulic drive (hydraulic driver) 3 and the sensors 10 and 11 of the additional layer.
The third is a portion of the electrical circuit including the control amplifier 13, and the fourth is
a hydraulic circuit including the fluid pressure controller 14. The diaphragm l mounted on the
front of the cabinet 2 is made of a lightweight and sufficiently strong material and structure that
moves integrally as a whole with respect to the target acoustic output, and in this case is made of
a carbon iaM molded product . Although FIG. 1 shows a flat plate, the shape of the diaphragm 1
can be selected to any shape such as a cone shape. The hydraulic driver 3 mounted on the back
of the cabinet 2 divides the interior of the rigid shell 4 back and forth by the diaphragm 5 as a
movable body disposed at the center, and on the-side here, the hydraulic chamber A spring 8
which opposes the fluid pressure of the fluid pressure chamber 6 is disposed in the front
chamber 7 on the other side. The fluid pressure chamber 6 is provided with a spring 19 in order
to prevent deformation of the diaphragm 5 when not in use without fluid pressure. 2) The
diaphragm 1 and the diaphragm 5 of the hydraulic driver 3 are connected by a connecting rod 9
which traverses the inside of the cabinet 2. The mounting position of the zero position sensor 11
attached to the liquid pressure driven speaker is the liquid pressure sensor 10 detecting the
pressure of the liquid pressure chamber 6 and the position sensor 11 detecting the movement of
the connecting rod 9. Since it moves integrally with the diaphragm 5 and the diaphragm l, it does
not have to be necessarily provided at the connection rod 9 but may be provided at the
diaphragm 5 or the diaphragm 1 or the like. Detection signals from the hydraulic pressure sensor
10 and the position sensor 11 are sent to the control amplifier 13. The control amplifier 13
controls the fluid pressure controller 12 in response to the signal input from the signal source
12, and the fluid pressure controller 12 sends an output signal to the fluid pressure driver 3 to
adjust the pressure in the fluid pressure chamber 6. The detection signals from the sensors 10
and 11 are additionally input to the control amplifier 13, and in response to this, the control
amplifier 13 outputs an output signal to the fluid pressure controller 12 to finely adjust the
pressure in the fluid pressure chamber 6. Change the size. The pump 18 constituting the
hydraulic pressure source comprises a pump of a type with minimal pressure fluctuation as
much as possible so that the ripples of the hydraulic pressure source do not become audible, for
example, a screw pump, and the pressure regulator 16 and the accumulator 15 Cooperative
(With movement, less pressure fluctuation hydraulic pressure. The fluid is supplied to the fluid
pressure chamber 6 of the fluid pressure driver 3. The operation of the above configuration will
be described with reference to FIG. The control amplifier 13 receives an electrical signal to be
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electroacoustically converted from the signal source 12, converts it into a change in voltage or
current suitable for driving the hydraulic driver 3, and controls the hydraulic controller 14.
The fluid pressure controlled by the fluid pressure controller 14 is supplied to the fluid pressure
chamber 6 of the fluid pressure driver 3 and the diaphragm 5 moves to the left and right in
response to the signal from the signal source 12. The air is transferred to the diaphragm 1
through the movement of the diaphragm 1 and emitted as a sound wave. Incidentally, this
compression wave is isolated by the shell 4 and the diaphragm 5 is not given a fixed ring. The
control amplifier 3 receives from the signal source 12 an electrical signal to be
electroacoustically converted, and converts it into a change in voltage or current suitable for
driving the hydraulic driver 3. At this time, the hydraulic pressure is used as a correction signal.
The pressure signal of the chamber 6 and the signal of the position of the connecting rod 9 are
received from the respective sensors 10, 11. The fluid pressure detection signal from the fluid
pressure sensor 10 not only controls the fluid pressure to follow the electrical signal, but also the
fluid pressure of the fluid pressure driver 5 so that no harmful fluctuation of the fluid pressure
source is emitted as sound. Control. In addition, the signal from the position sensor 11 detecting
the movement of the connecting rod 9 improves the function of holding the origin when the
electric signal is zero, and the function of differentiating to obtain the velocity and acceleration
and improving the followability. Let Liquid tank 17. ポンプ18. アキエミュレータ15.
Pressure regulator 16. The hydraulic pressure controller 14 has been established as an existing
technology, so it will not be described in particular, but low noise, low hydraulic pressure
fluctuation, low temperature rise, high efficiency to meet the purpose of the present hydraulic
pressure driven speaker. Select and use Further, in order to facilitate the movement of the
hydraulic drive speaker and the accessory device, consideration is given to reducing the size and
weight and closing the liquid. FIG. 2 shows another embodiment of the present invention. In the
embodiment of FIG. 2, both sides of the diaphragm 5 are both hydraulic chambers 60. 70, and a
differential pressure type hydraulic driver is constructed. As a driver structure, the spring 8 and
the stopper 19 of FIG. Instead, a bellows seal 20 is provided to seal the fluid pressure chamber
60.70. Further, the h + hydraulic pressure sensor 10 is replaced by a differential pressure sensor
21, and the hydraulic pressure controller 14 is replaced by a hydraulic pressure controller 22
which drives the hydraulic pressure chambers 60, 70 in a differential pressure system. FIG. 3
shows the frequency-sound pressure characteristics of the hydraulic drive speaker of the tp JZ
diagram or FIG. 3. As shown by the solid line, the sound of the very low frequency range from
near zero @ near to about 100 Hz is The 0 dotted line which is found to be strongly radiated
indicates the case of artificially cutting an extremely low frequency region, for example 18 Hz or
less, so as not to become an over-amplitude.
This fluid pressure drive speaker has a low pass (low pass) compared to the frequency-sound
pressure characteristics of a general dynamic speaker being bypass (high pass, low pass
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attenuation). Because it has high-frequency attenuation characteristics, it is possible to configure
a broader-band sound system by combining it with a conventional speaker. Especially in outdoor
rock concerts, etc. 1. The low frequency band below 80 Hz is usually attenuated, but since this
fluid pressure driven speaker radiates ultra-low tones that sense wind pressure on the body,
When used for a rock concert or the like, a more powerful acoustic effect can be obtained. When
sound is generated by the liquid drive, pressure fluctuation of the hydraulic pressure source
causes noise and contaminates the sound, but in the liquid pressure driven speaker according to
the L embodiment, a low speed screw pump or the like which hardly causes pulsation in the
pump 18 To improve the accumulator 15, and to feed back the pressure in the hydraulic
pressure chamber 6 of the hydraulic pressure driver 3 or the differential pressure between the
hydraulic pressure chamber 60 and the hydraulic pressure chamber 70, thereby removing noise
and clearing It can be a sound. In the two embodiments, the hydraulic driver 1 of the hydraulic
drive speaker has a diaphragm type structure, but the present invention is not limited to the
diaphragm type but a piston type. A hydraulic driver can be constructed using a similar principle,
such as a bellows type, to obtain a desired effect. Since the present invention is configured as
described above, the following effects can be obtained. In the hydraulic drive speaker according
to the first to fourth aspects of the present invention, since the drive source is hydraulic pressure
instead of magnetic force, the hydraulic system has a substantial drive force and braking force,
and it is from almost near zero. A speaker can be obtained that can emit powerfully low
frequency sound up to about 1 o O Hz. Moreover, since the frequency-sound pressure
characteristic is a low-pass characteristic, by combining with a conventional speaker, a widerband sound system can be configured. In the speaker drive device according to the fifth aspect of
the invention, since the detection signal of the fluid pressure sensor is fed back to the control
amplifier, pulsation in a low frequency range is eliminated. Furthermore, in the configuration of
the speaker drive device according to the sixth aspect, since the detection signal of the position
sensor is fed back to the control amplifier, the response and the center position holding function
of the movable body at the time of no signal can be improved. Further, in the loudspeaker drive
device according to the seventh aspect of the invention, pulsation is eliminated and high
frequency components are removed by using a pump with little pulsation.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a view showing an embodiment of a liquid pressure drive speaker and a speaker drive
device according to the present invention, FIG. 2 is a view showing another embodiment of a
liquid pressure driver of the liquid pressure drive speaker, and FIG. FIG. 4 is a diagram showing
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the frequency-sound pressure characteristics of the hydraulic drive speaker of FIG. 4, FIG. 4 is a
diagram showing the configuration of a conventional dynamic speaker, and FIG. 5 is a diagram
showing the frequency-sound pressure characteristics thereof.
In the figure, 1 is a diaphragm, 2 is a cabinet, 3 is a hydraulic driver, 5 is a diaphragm, 6 is a
hydraulic pressure chamber, 8 is a spring, 9 is a connecting rod, 10 is a hydraulic pressure
sensor, 11 is a position sensor, 12 is a position sensor Signal source, 13: control amplifier, 14:
hydraulic pressure controller, 15: accumulator, 16: pressure regulator! Reference numeral 17
denotes a tank, 18 denotes a pump, and 20 denotes a bellows seal.
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