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JP2005073126

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DESCRIPTION JP2005073126
PROBLEM TO BE SOLVED: To converge or diffuse reproduced sound according to a situation of
listening to the reproduced sound. SOLUTION: A carrier wave is modulated by a signal wave
output from a signal source generating a signal wave in an audio frequency band, and an
ultrasonic transducer is driven by the modulation signal to reproduce an audio sound in an audio
frequency band. A plurality of louvers 20A and 20B are integrally provided on the front surface
of the speaker main body and reflect the reproduced sound in any one direction or both
directions in the vertical direction and the horizontal direction. It has angle adjustment knobs
27A and 27B which change each setting angle so that the reproduced sound converges or
diffuses depending on the situation of listening to the reproduced sound. [Selected figure] Figure
1
Method of controlling directivity angle of ultrasonic speaker, ultrasonic speaker, ultrasonic
speaker system and louver device
[0001]
The present invention relates to a method of controlling the directivity angle of an ultrasonic
speaker using a highly directional ultrasonic transducer, an ultrasonic speaker, an ultrasonic
speaker system, and a louver device.
[0002]
Conventionally, it has been known that an ultrasonic speaker that utilizes the nonlinearity of the
medium (air) to ultrasonic waves can reproduce signals in the audio frequency band having a
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much sharper directivity than conventional speakers ( See, for example, Patent Document 1).
The configuration of a conventional ultrasonic speaker is shown in FIG. In the figure, the
ultrasonic speaker comprises an audio frequency wave oscillation source 51 generating an audio
frequency band signal, a carrier wave oscillation source 52 generating a carrier wave, a
modulator 53, a power amplifier 54, and an ultrasonic transducer. And 55.
[0003]
In the above configuration, the carrier wave in the ultrasonic frequency band output from the
carrier wave oscillation source 52 is modulated by the modulator 53 by the signal wave output
from the audio frequency wave oscillation source 51, and the modulation signal amplified by the
power amplifier 84 The ultrasonic transducer 55 is driven. As a result, the modulated signal is
converted to a sound wave of a finite amplitude level by the ultrasonic transducer 55, and this
sound wave is emitted into the medium (in air) and the sound noise in the original audio
frequency band by the nonlinear effect of the medium (air). Is to be played. In this case, the
reproduction range of the reproduction signal in the audio frequency band is a beam-like range
from the ultrasonic transducer 55 in the emission axis direction. Here, the "reproduction range of
the reproduction signal" includes both the distance that the reproduction signal reaches from the
sound wave emission surface of the ultrasonic transducer in the radiation axis direction and the
beam width (beam emission angle) of the ultrasonic beam.
[0004]
Here, the configuration of an ultrasonic transducer used in a conventional ultrasonic speaker is
shown in FIG. Conventional ultrasonic transducers (or vibration transducers) are mostly of the
resonance type using a piezoelectric ceramic as a vibrating element. The ultrasonic transducer
shown in FIG. 7 uses piezoelectric ceramic as a vibrating element to perform both the conversion
from an electrical signal to an ultrasonic wave and the conversion from an ultrasonic wave to an
electrical signal (transmission and reception of ultrasonic waves). The bimorph type ultrasonic
transducer shown in FIG. 7A is composed of two piezoelectric ceramics 61 and 62, a cone 63, a
case 64, leads 65 and 66, and a screen 67.
[0005]
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The piezoelectric ceramics 61 and 62 are bonded to each other, and the lead 65 and the lead 66
are connected to the surface opposite to the bonding surface, respectively. On the other hand, the
unimorph ultrasonic transducer shown in FIG. 7B is composed of one piezoelectric ceramic 71, a
case 72, leads 73 and 74, an internal wiring 75, and a glass 76. The piezoelectric ceramic 71 is
connected to the lead 73 via the internal wiring 75 and grounded to the case 72. Since the
resonance type ultrasonic transducer utilizes the resonance phenomenon of piezoelectric
ceramic, the transmission and reception characteristics of the ultrasonic wave become good in a
relatively narrow frequency band around the resonance frequency.
[0006]
Next, FIG. 8 shows a specific configuration of the electrostatic wide-band oscillation type
ultrasonic transducer. In the electrostatic ultrasonic transducer shown in FIG. 8, a dielectric 131
(insulator) such as PET (polyethylene terephthalate resin) having a thickness of about 3 to 10
μm is used as a vibrator. For the dielectric 131, the upper electrode 132 formed as a metal foil
such as aluminum is integrally formed on the upper surface thereof by a process such as
evaporation, and the lower electrode 133 formed of brass is the lower surface of the dielectric
131 It is provided to contact the part. The lower electrode 133 is connected to the lead 152 and
fixed to a base plate 135 made of Bakelite or the like.
[0007]
Further, a lead 153 is connected to the upper electrode 132, and the lead 153 is connected to a
DC bias power supply 150. A DC bias voltage for attracting the upper electrode of about 50 to
150 V is constantly applied to the upper electrode 132 by the DC bias power supply 150 so that
the upper electrode 32 is attracted to the lower electrode 13 side. An AC signal source 11
corresponds to the output (AC 50 to 150 Vp-p) of the power amplifier 54 in FIG. The dielectric
11 and the upper electrode 12 and the base plate 15 are crimped by the case 130 together with
the metal rings 136, 137 and 138 and the mesh 139.
[0008]
On the surface of the lower electrode 133 on the side of the dielectric 131, a plurality of
microgrooves of approximately several tens to several hundreds of μm having an uneven shape
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are formed. Since this minute groove serves as an air gap between the lower electrode 133 and
the dielectric 131, the distribution of capacitance between the upper electrode 132 and the
lower electrode 133 changes minutely. The random minute grooves are formed by manually
roughening the surface of the lower electrode 133 with a file. In the electrostatic ultrasonic
transducer, the frequency characteristics of the ultrasonic transducer become broad as shown by
a curve Q1 in FIG. 9 by thus forming an infinite number of capacitors having different sizes and
depths of air gaps. There is.
[0009]
In the ultrasonic transducer 55 configured as described above, the modulation signal (the output
of the power amplifier 54) is applied between the upper electrode 132 and the lower electrode
133 in a state where a DC bias voltage is applied to the upper electrode 132. There is.
Incidentally, as shown by a curve Q2 in FIG. 9, the frequency characteristic of the resonance type
ultrasonic transducer has a center frequency (resonance frequency of the piezoelectric ceramic)
of, for example, 40 kHz and ± 5 kHz with respect to the center frequency which is the maximum
sound pressure. At a frequency of -30 dB relative to the maximum sound pressure. On the other
hand, the frequency characteristics of the broadband oscillation type ultrasonic transducer of the
above configuration are flat from 40 kHz to 100 kHz, and are about ± 6 dB at 100 kHz as
compared to the maximum sound pressure. JP-A-58-119293
[0010]
As an ultrasonic transducer used for an ultrasonic speaker, either a resonant ultrasonic
transducer (FIG. 7) or an electrostatic ultrasonic transducer (FIG. 8) may be used. It is desirable
for the sound to reach far in a beam with sharp directivity. However, for use as a speaker for a
home theater projector or the like, it is desirable that the reproduced sound can be spatially
diffused to some extent according to the listening situation of the reproduced sound.
[0011]
The present invention has been made in view of such circumstances, and it is an ultrasonic
speaker directivity angle control method, an ultrasonic speaker, and a supersonic speaker
capable of converging or diffusing the reproduced sound according to the situation of listening to
the reproduced sound. An object of the present invention is to provide a sound wave speaker
system and a louver device.
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[0012]
The invention according to claim 1 modulates a carrier wave by a signal wave output from a
signal source generating a signal wave in an audio frequency band, and drives an ultrasonic
transducer by the modulation signal, thereby generating an audio frequency band signal. In the
directivity angle control method of an ultrasonic speaker for reproducing sound, a plurality of
louvers for reflecting sound waves in any one direction or both of the vertical direction and the
horizontal direction on the front surface of the ultrasonic speaker are installed, and the plurality
of louvers The setting angle of each is changed so as to converge or diffuse the reproduced
sound in accordance with the situation of listening to the reproduced sound.
[0013]
The invention according to claim 2 is the directivity angle control method for an ultrasonic
speaker according to claim 1, wherein the plurality of louvers are a first louver group installed in
the vertical direction on the front surface of the ultrasonic speaker. And a second louver group
installed in the horizontal direction on the front surface of the ultrasonic speaker, wherein the
first and second louver groups can adjust the setting angle independently.
[0014]
Further, in the invention according to claim 3, in the directivity angle control method for an
ultrasonic speaker according to any one of claims 1 or 2, the plurality of louvers are disposed in
the vicinity of the center of the front surface of the ultrasonic speaker It is characterized by
being.
[0015]
The invention according to claim 4 is that in the directivity angle control method for an
ultrasonic speaker according to any one of claims 1 to 3, the setting angles of the plurality of
louvers are all set to the same angle. It features.
[0016]
The invention according to claim 5 is the directivity angle control method for an ultrasonic
speaker according to any one of claims 1 to 3, wherein the setting angles of the plurality of
louvers are near the center of the front surface of the ultrasonic speaker. It is characterized in
that the louvers installed at the place and the louvers installed at other places are different.
[0017]
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Also, the invention according to claim 6 modulates a carrier wave by a signal wave output from a
signal source generating a signal wave in an audio frequency band, and drives an ultrasonic
transducer by the modulation signal to thereby convert an audio frequency band. An ultrasonic
speaker for reproducing the signal sound, and a plurality of louvers for reflecting the reproduced
sound in one direction or both directions of the vertical direction and the horizontal direction are
integrally provided on the front surface of the speaker main body; And adjusting means for
changing the setting angle of each of the louvers so that the reproduced sound converges or
diffuses in accordance with the situation of listening to the reproduced sound.
[0018]
The invention according to claim 7 is the ultrasonic speaker according to claim 6, wherein the
plurality of louvers are a first louver group vertically installed on the front surface of the
ultrasonic speaker, and an ultrasonic speaker And a second louver group disposed in the
horizontal direction on the front face of the second louver, wherein the first and second louver
groups each have adjusting means for adjusting the set angle independently.
[0019]
The invention according to claim 8 is characterized in that the plurality of louvers of the
ultrasonic speaker according to any one of claims 6 or 7 are installed from near the center of the
front surface of the ultrasonic speaker to the peripheral portion. .
[0020]
The invention according to claim 9 is the ultrasonic speaker according to any one of claims 6 to
8, characterized in that the setting angles of the plurality of louvers are all set to the same angle
by the adjusting means. I assume.
[0021]
The invention according to claim 10 is the ultrasonic speaker according to any one of claims 6 to
8, wherein the setting angles of the plurality of louvers are points near the center of the front
surface of the ultrasonic speaker by the adjusting means. And the louvers installed at the other
places are set to be different from each other.
[0022]
In the invention according to claim 11, an audio frequency band is obtained by modulating a
carrier wave with a signal wave output from a signal source generating a signal wave in an audio
frequency band, and driving an ultrasonic transducer with the modulation signal. The ultrasonic
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speakers for reproducing the signal sound of 2 are housed in the upper and lower case in one
case, and a plurality of louvers are installed on the front of the case so as to face each of the
ultrasonic speakers, The ultrasonic speakers respectively reproduce acoustic signals of different
channels, and the plurality of louvers are a first louver group vertically disposed on the front
surface of the ultrasonic speakers, and the ultrasonic waves. It comprises: a second louver group
installed in the horizontal direction on the front of the speaker, and has adjusting means for
adjusting the setting angles of the first and second louver groups independently of each other
And wherein the door.
[0023]
In the invention according to claim 12, an audio frequency band is obtained by modulating a
carrier wave with a signal wave output from a signal source generating an audio frequency band
signal wave and driving an ultrasonic transducer with the modulation signal. And a plurality of
louvers for reflecting a sound wave in one or both of the vertical direction and the horizontal
direction on the front surface of the ultrasonic speaker. And adjusting means for changing the
setting angle of each of the plurality of louvers so as to converge or diffuse the reproduced sound
in accordance with the condition of listening to the reproduced sound.
[0024]
As described above, according to the invention described in claims 1 to 5 (a method of
controlling the directivity angle of an ultrasonic speaker), the reproduced sound is converged
according to the situation in which the reproduced sound output from the ultrasonic speaker is
listened to Or, it can be diffused.
[0025]
Further, according to the invention (ultrasonic speaker) of the sixth to tenth aspects, an
ultrasonic speaker capable of converging or diffusing the reproduced sound according to the
situation of listening to the reproduced sound to be output can be obtained. The effect is
obtained.
[0026]
Further, according to the invention as set forth in claim 11 (ultrasonic speaker system), it is
possible to obtain an ultrasonic speaker system capable of converging or diffusing the
reproduced sound in accordance with the situation of listening to the reproduced sound to be
output. The effect is obtained.
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[0027]
Further, according to the invention (louver device) of claim 12, by attaching to the front of the
ultrasonic speaker and using it, the reproduced sound can be reproduced according to the
situation of listening to the reproduced sound outputted from the ultrasonic speaker. The effect
of convergence or diffusion can be obtained.
[0028]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings.
FIG. 1 shows the configuration of an ultrasonic speaker according to an embodiment of the
present invention.
The present embodiment shows an example applied to a home theater projector.
FIG. 1 is a plan view of the screen 3 as viewed from above.
In FIG. 1, a louver device 2 including a plurality of louvers 20 is installed on the front surface of
the ultrasonic speaker 1.
A screen 3 on which an image is projected via a projection optical system (not shown) is installed
in front of an ultrasonic speaker 1 constituting a home theater projector.
[0029]
The ultrasonic speaker 1 has the same configuration as the conventional ultrasonic speaker
shown in FIG. 6 described above.
That is, the carrier wave of the ultrasonic frequency band is modulated by the signal wave output
from the signal source generating the signal wave of the audio frequency band, and the
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ultrasonic transducer is driven by the modulation signal to thereby generate the signal sound of
the audio frequency band. It has a function to play.
The louver device 2 is shown in FIG. 1 only in the horizontal direction on the front surface of the
ultrasonic speaker 1, but actually, it is vertically installed on the front surface of the ultrasonic
speaker 1 as described later There is.
[0030]
A beam-like signal sound (reproduction sound) emitted from the ultrasonic speaker 1 is reflected
by the louver 20 set at a predetermined angle by angle adjustment means (not shown), and the
front surface 3A of the screen 3 located further forward And the reproduced sound converges or
diffuses.
FIG. 2 shows the relationship between the setting angle θ of the louver and the reflection angle
θ ′ of the front surface 3A of the screen 3 of the reproduction sound.
[0031]
As shown in the figure, when the sound wave emitting surface of the ultrasonic speaker 1 and
the screen 3 are installed in parallel, the angle θ with respect to the line segment orthogonal to
the sound wave emitting surface of the ultrasonic speaker 1 and the screen 3 The louver is set as
follows (in this specification, θ is defined as the setting angle of the louver.
And the reflection angle θ ′ at the screen 3 from the relationship shown in FIG. 2 becomes: θ
′ = (π / 2) −2θ
Therefore, by adjusting the setting angle θ of the louver 20, it is possible to control the
reflection angle θ ′ at the front surface 3A of the screen 3 of the reproduced sound, in other
words, the directivity angle of the ultrasonic speaker 1.
That is, if the set angle θ is reduced, the signal sound can be converged, and conversely, the
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reproduced sound can be diffused by increasing the set angle θ.
[0032]
Next, FIG. 3 shows an appearance configuration of the ultrasonic speaker 1 in which the louver
device 2 is installed in the horizontal direction and the vertical direction of the front surface.
In the figure, the ultrasonic speaker 1 is housed in a housing 30, and the louver device 2 is
installed on the front surface of the housing 30.
The louver device 2 includes a first louver group 20A including a plurality of louvers 2A installed
in the vertical direction on the front surface of the ultrasonic speaker 1 and a plurality of louvers
2B installed in the horizontal direction on the front surface of the ultrasonic speaker 1 The first
and second louver groups 20A and 20B can adjust the setting angles of the louvers 2A and 2B
independently by operating the angle adjustment knobs 27A and 27B. It has become.
[0033]
The first and second louver groups 20A and 20B are respectively installed in the vicinity of the
center of the front surface of the ultrasonic speaker 1 and in the peripheral portion.
The respective louvers 2A constituting the first louver group 20A are rotatably supported by the
shaft 200A between the side plates 30A and 30B of the housing 30, and the locking plates 22A
are formed by the engaging projections 201A formed on the respective louvers 2A. It is locked
by the guide hole 23A provided in.
In the locking plate 22A, corresponding to each louver 2A, the guide hole 23A is orthogonal to
the sound wave emitting surface of the ultrasonic speaker 1 as it goes from the vicinity of the
center of the front surface of the ultrasonic speaker 1 to the periphery along the vertical
direction. It is formed so that the angle with respect to the horizontal plane to make may become
large.
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[0034]
A rack 24A is fixed to the locking plate 22A, and a pinion gear 25A engaged with the rack 24A is
fixed to one end of the rotation shaft 26A, and the rotation shaft 26A corresponds to the side
plate 30B of the housing 30. An angle adjustment knob 27A is fixed to the other end of the
rotary shaft 26A by a bearing (not shown).
[0035]
Similarly, each louver 2B constituting the second louver group 20B is rotatably supported by a
shaft 200B between a ceiling plate 30C and a bottom plate 30D of the housing 30, and an
engagement protrusion 201B formed on each louver 2B. As a result, it is locked in the guide hole
23B provided in the locking plate 22B.
In the locking plate 22B, corresponding to each louver 2B, the guide hole 23B is orthogonal to
the sound emitting surface of the ultrasonic speaker 1 as it goes from the vicinity of the center of
the front surface of the ultrasonic speaker 1 to the peripheral part along the vertical direction. It
is formed so that the angle with the vertical plane to be made may be large.
[0036]
A rack 24B is fixed to the locking plate 22B, and a pinion gear 25B engaged with the rack 24B is
fixed to one end of the rotation shaft 26B. The rotation shaft 26B is a ceiling plate 30C of the
housing 30. The angle adjustment knob 27B is fixed to the other end of the rotary shaft 26B by a
bearing (not shown).
FIG. 4 is a plan view showing a structure in which the central portion of the front surface of the
ultrasonic speaker 1 in FIG. 3 is cut along a horizontal plane.
In FIG. 3, the louvers 2A and 2B of the first and second louver groups 20A and 20B are in a
closed state.
[0037]
In the above configuration, when the angle adjustment knob 27A is turned clockwise according
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to the situation in which the reproduced sound is heard, the pinion gear 25A is turned clockwise
to fix the locking plate 22A engaged with the pinion gear 25A. The rack 24A provided is moved
rearward in the figure, and as a result, the engaging projections 201A of the respective louvers
2A are moved outward in a state of being restricted in the guide holes 23A.
[0038]
Here, as described above, as the guide hole 23A formed in the locking plate 22A corresponding
to each louver 2A goes from the vicinity of the center of the front surface of the ultrasonic
speaker 1 to the peripheral portion along the vertical direction Since the angle formed between
the sound emission surface of the ultrasonic speaker 1 and the horizontal plane orthogonal to
the horizontal plane is large, the angle that each louver 2A opens outward from the center
toward the peripheral portion in the vertical direction Is set to be large.
As a result, the signal sound output from the sound wave emitting surface of the ultrasonic
speaker 1 is diffused in the vertical direction and emitted forward.
[0039]
On the other hand, when the angle adjustment knob 27B is turned clockwise with the louvers 2A
of the first louver group 20A closed, the pinion gear 25B is turned clockwise to engage with the
pinion gear 25B. The rack 24B fixed to the plate 22B is moved rearward in the figure, and as a
result, the engaging projections 201B of the respective louvers 2B are moved outward in a state
of being restricted in the guide holes 23B.
[0040]
As in the first louver group 20A, in the second louver group 20B, the guide holes 23B formed in
the locking plate 22B corresponding to the respective louvers 2B are horizontal from near the
center of the front surface of the ultrasonic speaker 1 Each louver 2A extends horizontally from
the center to the peripheral portion because the angle formed between the sound emitting
surface of the ultrasonic speaker 1 and the vertical plane orthogonal to the sound emitting
surface of the ultrasonic speaker 1 increases in the direction toward the peripheral portion along
the direction. It is set so that the angle which opens outwards becomes large as it faces to.
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As a result, the signal sound output from the sound wave emitting surface of the ultrasonic
speaker 1 is diffused in the left-right direction of the ultrasonic speaker 1 and radiated forward
in the figure.
[0041]
Also, conversely, by rotating the angle adjustment knobs 27A and 27B in the counterclockwise
direction according to the situation where the reproduced sound is listened, the signal sound
emitted from the ultrasonic speaker 1 is adjusted in the direction to converge forward. can do. In
the present embodiment, the louvers of the first louver group 20A and the second louver group
20B are disposed near the center of the front surface of the ultrasonic speaker 1, and the louvers
provided in the peripheral portion, Although adjustment is made so as to make the set angles
different, by forming the guide holes 23A, 23B so as to be at the same angle from the reference
position, setting of the louvers when the angle adjustment knobs 27A, 27 are operated The
angles may be the same.
[0042]
FIG. 5 shows an appearance configuration of an ultrasonic speaker system configured to include
two ultrasonic speakers 1A and 1B. These ultrasonic speakers 1A and 1B modulate a carrier
wave with a signal wave output from a signal source generating a signal wave in the audio
frequency band, and drive the ultrasonic transducer with the modulation signal to thereby
convert the audio frequency band. The speakers 1A and 1B are designed to reproduce stereo
sound signals of different channels. The ultrasonic speakers 1A and 1B are housed in the upper
and lower case 300 respectively, and louver devices 200A and 200B consisting of a plurality of
louvers are installed on the front face of the case 300 to face each ultrasonic speaker. It is done.
[0043]
The louver devices 200A and 200B respectively include a first louver group installed in the
vertical direction on the front surface of the ultrasonic speakers 1A and 1B, and a second louver
installed in the horizontal direction on the front surface of the ultrasonic speakers 1A and 1B. It
comprises a group, and has angle adjustment knobs 270A, 270B and 270C as adjusting means
for adjusting the set angles of the first and second louvers independently. In the above
configuration, by operating the angle adjustment knobs 270A, 270B and 270C of the louvers
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constituting the louver devices 200A and 200B, it is possible to diffuse or converge depending
on the situation in which the reproduction sound is listened to.
[0044]
According to the present embodiment, the conventional ultrasonic speaker has only been used
for explanation of works at a museum, etc. By thus emitting sound at a wide angle, the
application is expanded as an acoustic device such as a projector. In addition, it is possible to
construct a system that can be applied to both individual and multi-party listening.
[0045]
Explanatory drawing which shows schematic structure of the ultrasonic speaker which concerns
on embodiment of this invention. Explanatory drawing which shows the relationship between
setting angle (theta) of the louver which diffuses or converges the reproduction | regeneration
sound radiated | emitted from the ultrasonic speaker which concerns on embodiment of this
invention, and reflection angle (theta) 'of reproduction | regeneration sound in screen front. The
figure which shows the structure of the ultrasonic speaker which concerns on embodiment of
this invention with which the louver apparatus was installed in the front. FIG. 4 is a plan view of
the vicinity of the center of the ultrasonic speaker in FIG. 3 cut along a horizontal plane. The
figure which shows the external appearance structure of the ultrasonic speaker system to which
this invention is applied. The block diagram which shows the electric constitution of an
ultrasonic speaker. The figure which shows the structural example of a resonance type ultrasonic
transducer. The figure which shows the structure of the electrostatic-type wide frequency band
oscillation type | mold ultrasonic transducer. The characteristic view which shows the frequency
characteristic of an ultrasonic transducer.
Explanation of sign
[0046]
1, 1A, 1B: ultrasonic speaker, 2, 200A, 200B: louver device, 2A, 2B: louver, 3: screen, 20A: first
louver group, 20B: second louver group, 22A, 22B. Stop plate, 23A, 23B: guide hole, 24A, 24B:
rack, 25A, 25B: pinion gear, 26A, 26B: rotation shaft, 27A, 27B, 270A, 270B, 270C: angle
adjustment knob, 30, 300: housing 30A, 30B: Side plate, 30C: Ceiling plate, 30D: Bottom plate
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