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JP2012060572

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DESCRIPTION JP2012060572
A sounding device is provided that is easy to adjust preload applied to a magnetostrictive
element, can simplify the structure of a magnetostrictive actuator, and can reduce manufacturing
cost by reducing the number of parts. A sound generation device 6 is mounted on a vehicle 1 and
generates a notification sound for notifying of the presence of the vehicle 1. The sound
generation device 6 is provided with a diaphragm 20 and a first surface 40A and a second
surface facing each other. A case 40 having a surface 40B, a giant magnetostrictive element 41
housed in the case 40, and a head 45 whose top projects from the through hole 30 formed in the
first face 40A and is vibrated by expansion and contraction of the giant magnetostrictive element
41 By pressing the super magnetostrictive actuator 21 toward the diaphragm 20 from the
second surface 40B side with the head 45 being in contact with the back surface 20B of the
diaphragm 20, the And a bracket 22 (a plate spring portion 22A) for applying a preload.
[Selected figure] Figure 4
Pronunciation device and vehicle presence notification device
[0001]
BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a
sound generation device and a vehicle presence notification device provided with the same.
[0002]
For example, Patent Document 1 below discloses a vehicle sound generator system using a
magnetostrictive actuator having a magnetostrictive element, which is not for outputting an
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1
approaching notification sound of a quiet vehicle such as an electric car or a hybrid car.
In the magnetostrictive actuator, a coil spring for applying a preload to the magnetostrictive
element is accommodated in a case of the magnetostrictive actuator together with the
magnetostrictive element, the drive coil, and the like.
[0003]
Patent No. 4418415 gazette
[0004]
According to the magnetostrictive actuator disclosed in Patent Document 1, a coil spring for
applying a preload to the magnetostrictive element is disposed in the case of the
magnetostrictive actuator.
Therefore, when it is desired to adjust the preload after the magnetostrictive actuator unit is
assembled, the adjustment operation is complicated because the unit needs to be disassembled to
replace the coil spring. Further, since the coil spring needs to be disposed in the case, the
structure of the magnetostrictive actuator is complicated, and the number of parts is increased to
increase the manufacturing cost.
[0005]
The present invention has been made in view of the above circumstances, adjustment of preload
applied to the magnetostrictive element is easy, the structure of the magnetostrictive actuator
can be simplified, and reduction of the manufacturing cost can be achieved by reducing the
number of parts. It is an object of the present invention to obtain a sound producing device and a
vehicle presence notification device provided with the same.
[0006]
The sound generation device according to the first aspect of the present invention is a sound
generation device which is mounted on a vehicle and generates a notification sound for notifying
of the presence of the vehicle, and includes: a diaphragm; A magnetostrictive actuator having a
case having two surfaces, a magnetostrictive element housed in the case, and a head whose top
projects from the through hole formed in the first surface and is vibrated by the expansion and
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contraction of the magnetostrictive element; Biasing means for applying a preload to the
magnetostrictive element by pressing the magnetostrictive actuator from the second surface side
toward the diaphragm in a state where the head is in contact with the back surface of the
diaphragm; It is characterized by having.
[0007]
According to the sound generation device in the first aspect, the biasing means presses the
magnetostrictive actuator from the second surface side toward the diaphragm in a state where
the head is in contact with the back surface of the diaphragm. Give a pre-weight.
As described above, since the biasing means is disposed outside the case of the magnetostrictive
actuator, there is no need to disassemble the magnetostrictive actuator at the time of adjusting
the preload, so that the adjustment of the preload can be easily performed. It becomes.
In addition, since it is not necessary to arrange a coil spring for applying a preload in the case,
the structure of the magnetostrictive actuator can be simplified. Further, since the coil spring is
unnecessary, the number of parts of the magnetostrictive actuator can be reduced, and the
manufacturing cost can be reduced.
[0008]
In the sound generation device according to the second aspect of the present invention, in
particular, in the sound generation device according to the first aspect, the biasing unit biases the
magnetostrictive actuator by elasticity, and the magnetostrictive actuator from the second
surface side The supporting member is characterized by being a supporting member.
[0009]
According to the sound generation device of the second aspect, since the support member is
disposed outside the case of the magnetostrictive actuator, it is possible to easily adjust the
preload by replacing the support member or the like. .
In addition, by using the supporting member as biasing means, the number of parts of the sound
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producing device can be reduced, and the manufacturing cost can be reduced.
[0010]
In the sound generation device according to the third aspect of the present invention, in
particular, in the sound generation device according to the first aspect, the biasing unit supports
the magnetostrictive actuator from the second surface side, and the second surface And an
elastic member for urging the magnetostrictive actuator by elasticity.
[0011]
According to the sound generation device of the third aspect, since the elastic member is
disposed outside the case of the magnetostrictive actuator, it is possible to easily adjust the
preload by replacing the elastic member or the like. .
[0012]
In the sound generation device according to the fourth aspect of the present invention, in
particular, in the sound generation device according to the first aspect, the biasing unit biases the
magnetostrictive actuator by elasticity, and the magnetostrictive actuator is provided on the back
surface side of the diaphragm. It is characterized by being a covering member which encloses.
[0013]
According to the sound generation device of the fourth aspect, since the covering member is
disposed outside the case of the magnetostrictive actuator, it is possible to easily adjust the
preload by replacing the covering member or the like. .
Further, by using the covering member also as the biasing means, the number of parts of the
sound producing device can be reduced, and the manufacturing cost can be reduced.
[0014]
In the sound generation device according to the fifth aspect of the present invention, in
particular, in the sound generation device according to the first aspect, the biasing unit is a
covering member that surrounds the magnetostrictive actuator on the back surface side of the
diaphragm; It is characterized in that it is an elastic member which is disposed between the
surface and to elastically bias the magnetostrictive actuator.
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[0015]
According to the sound generation device in the fifth aspect, since the covering member is
disposed outside the case of the magnetostrictive actuator, it is possible to easily adjust the
preload by replacing the covering member or the like. .
[0016]
In the sound generation device according to the sixth aspect of the present invention, in the
sound generation device according to any one of the first to fifth aspects, in particular, the
diaphragm is erected from a planar central portion and the central portion And a peripheral edge
portion that is bent to
[0017]
According to the sound generation device relating to the sixth aspect, the diaphragm has a flat
central portion and a peripheral edge portion bent so as to stand up from the central portion.
As described above, by bending the peripheral portion of the diaphragm, the rigidity of the
diaphragm can be increased without increasing the thickness of the diaphragm. Therefore, it is
possible to output a notification sound with a large sound pressure from the diaphragm.
[0018]
A vehicle presence notification device according to a seventh aspect of the present invention is a
vehicle presence notification device which is mounted on a vehicle and generates a notification
sound for notifying the presence of the vehicle, and outputs an audio signal related to the
notification sound. A signal processing unit having a sound source, a sound generation unit
generating an alert sound based on the audio signal output from the sound source, and a control
unit controlling the signal processing unit based on a traveling state of the vehicle, The sound
generation unit includes a diaphragm, a case having a first surface and a second surface facing
each other, a magnetostrictive element housed in the case, and a top protruding from the
through hole formed in the first surface, A magnetostrictive actuator having a head vibrated by
expansion and contraction of a magnetostrictive element, and pressing the magnetostrictive
actuator from the second surface side toward the diaphragm in a state where the head is in
contact with the diaphragm. , It is characterized in that it has a biasing means for applying a
preload to the magnetostrictive element.
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[0019]
According to the vehicle presence informing apparatus in the seventh aspect, the biasing means
presses the magnetostrictive actuator from the second surface side toward the diaphragm in a
state where the head is in contact with the back surface of the diaphragm, thereby causing
magnetostriction. Preload the elements.
As described above, since the biasing means is disposed outside the case of the magnetostrictive
actuator, there is no need to disassemble the magnetostrictive actuator at the time of adjusting
the preload, so that the adjustment of the preload can be easily performed. It becomes.
In addition, since it is not necessary to arrange a coil spring for applying a preload in the case,
the structure of the magnetostrictive actuator can be simplified.
Further, since the coil spring is unnecessary, the number of parts of the magnetostrictive
actuator can be reduced, and the manufacturing cost can be reduced.
[0020]
According to the present invention, it is easy to adjust the preload applied to the magnetostrictive
element, the structure of the magnetostrictive actuator can be simplified, and the manufacturing
cost can be reduced by reducing the number of parts. It is possible to obtain a vehicle presence
notification device provided with the same.
[0021]
BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows typically the vehicle by which
the vehicle presence alerting | reporting apparatus which concerns on embodiment of this
invention was mounted.
BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows roughly the whole
structure of the vehicle presence alerting | reporting apparatus which concerns on embodiment
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of this invention.
It is a top view which shows typically the 1st external appearance structural example of a
sounding apparatus.
It is sectional drawing which shows the cross-section regarding the position along line IV-IV in
FIG. It is sectional drawing which shows typically the internal structure of a supermagnetostrictive actuator. It is a top view which shows typically the 2nd example of appearance
composition of a pronunciation device. It is sectional drawing which shows the cross-section
regarding the position along line VII-VII in FIG. It is a top view which shows typically the 3rd
external appearance structural example of a sounding apparatus. It is sectional drawing which
shows the cross-section regarding the position along line IX-IX in FIG. It is a top view which
shows typically the 4th external appearance structural example of a sounding apparatus. It is
sectional drawing which shows the cross-section regarding the position along line XI-XI in FIG. It
is a perspective view which shows the other structure of a diaphragm. FIG. 15 is a cross-sectional
view showing an example using the diaphragm shown in FIG. 12 corresponding to FIG. 4.
[0022]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings. Note that elements given the same reference numerals in different drawings
indicate the same or corresponding elements.
[0023]
FIG. 1 is a view schematically showing a vehicle 1 on which a vehicle presence notification device
2 according to the present embodiment is mounted. The vehicle 1 is an automobile such as an
electric car or a hybrid car that produces silence or a slight noise when traveling at low speed. In
the vehicle 1, a sound generation device 6 that generates a predetermined notification sound
when traveling at a low speed equal to or lower than a predetermined speed (for example, 20 km
/ hour) is attached, for example, inside a radiator grille. The notification sound is, for example, a
pseudo engine sound, a pseudo tire noise sound, a predetermined electronic sound, or any other
warning sound that can notify the presence of the vehicle 1 to a notification target such as a
pedestrian.
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[0024]
The sound producing device 6 may be attached not only to the front of the vehicle 1 but also to
the rear. In this case, a notification sound is output from the sound generation device in front
when the vehicle 1 advances, and a notification sound is output from the sound generation
device in the rear when the vehicle 1 moves backward.
[0025]
Alternatively, the sound generation device 6 may be attached to the four corners (right front, left
front, right rear, left rear) of the vehicle 1. In this case, in accordance with the traveling direction
of the vehicle 1, the notification sound is output from the corresponding sound generation
device. For example, when the vehicle 1 travels straight, the notification sound is output from the
sound generation device on the right front and the left front, and when the vehicle 1 travels to
the right rear, the notification sound is output from the sound generation device on the right rear
.
[0026]
FIG. 2 is a block diagram schematically showing the entire configuration of the vehicle presence
notification device 2 according to the present embodiment. As shown by the connection
relationship in FIG. 2, the vehicle presence notification device 2 includes a vehicle speed sensor
3, a control device 4 (control unit) such as an ECU (Electronic Control Unit), and a signal
processing device 5 having a sound source 10 and an amplifier 11. (Signal processing unit) and a
sound producing device 6 (sound producing unit).
[0027]
The vehicle speed sensor 3 detects the traveling speed of the vehicle 1 and outputs a detection
signal S1 indicating the traveling speed. The sound source 10 outputs an audio signal S3 related
to a prepared notification sound. The amplifier 11 amplifies and outputs the audio signal S3
input from the sound source 10. The sound generation device 6 outputs a notification sound
based on the audio signal S3 input from the signal processing device 5.
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[0028]
The control device 4 controls the signal processing device 5 based on the traveling state of the
vehicle 1. For example, when the traveling speed given by the detection signal S1 is equal to or
less than 20 km / h, the sound source 10 outputs the audio signal S3. When a plurality of sound
producing devices are mounted on the vehicle 1, the control device 4 gives notification from
among the plurality of sound producing devices based on a signal input from a steering angle
sensor (not shown) of the vehicle 1. Select the sound generator to output the sound.
[0029]
FIG. 3 is a plan view schematically showing a first appearance configuration example of the
sound generation device 6, and FIG. 4 is a cross-sectional view showing a cross-sectional
structure with respect to a position along line IV-IV in FIG. 5 is a cross-sectional view
schematically showing the internal structure of the giant magnetostrictive actuator 21. As shown
in FIG.
[0030]
5, the giant magnetostrictive actuator 21 has a hollow cylindrical case 40 having a first surface
40A (upper surface in FIG. 5) and a second surface 40B (bottom surface in FIG. 5), and a center
of the first surface 40A. A through-hole 30 formed in the portion, a giant magnetostrictive
element 41 which expands and contracts in the axial direction according to the strength of the
applied magnetic field, and a drive coil 42 disposed around the giant magnetostrictive element
41 for applying a magnetic field; The system comprises magnets 43 and 44 disposed at the
upper and lower ends of the giant magnetostrictive element 41 for applying a bias magnetic
field, and a head 45 fixed to the giant magnetostrictive element 41 via the magnet 43 and having
a top projecting from the through hole 30 It is done. In the giant magnetostrictive actuator 21
according to the present embodiment, a coil spring for applying a preload (also referred to as a
“preload”) to the giant magnetostrictive element 41 is not disposed in the case 40.
[0031]
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With reference to FIGS. 3 and 4, the sound generation device 6 is configured to include a
diaphragm 20, a giant magnetostrictive actuator 21, and a bracket 22. The diaphragm 20 shown
in FIGS. 3 and 4 is a flat plate having a front surface 20A (surface on the transmission direction
side of the notification sound) and a back surface 20B.
[0032]
The giant magnetostrictive actuator 21 is fixed to the diaphragm 20 by the bracket 22.
Specifically, as shown in FIG. 4, the bracket 22 presses the super magnetostrictive actuator 21
toward the diaphragm 20 from the second surface 40B side in a state where the head 45 is in
contact with the back surface 20B. The super magnetostrictive actuator 21 is supported from the
side of the surface 40B. Both ends of the bracket 22 are fixed to the diaphragm 20 by fasteners
23 such as bolts and nuts. Further, at a central portion of the bracket 22, a plate spring portion
22A having a curved shape is provided. The top of the curved shape of the plate spring portion
22A is in contact with the second surface 40B, and the super magnetostrictive actuator 21 is
biased toward the diaphragm 20 by the elasticity of the plate spring portion 22A. Is given a preweight. That is, in the example shown in FIGS. 3 and 4, the bracket 22 (the plate spring portion
22A) presses the super magnetostrictive actuator 21 toward the diaphragm 20 from the second
surface 40B side, and biases the super magnetostrictive actuator 21 by elasticity. By doing this, it
functions as biasing means for applying a preload to the giant magnetostrictive element 41.
[0033]
FIG. 6 is a plan view schematically showing a second example of the external appearance of the
sound producing device 6, and FIG. 7 is a cross-sectional view showing a cross-sectional
structure of a position along line VII-VII in FIG. Referring to FIGS. 6 and 7, the sound producing
device 6 is configured to include the diaphragm 20, the giant magnetostrictive actuator 21, and
the bracket 22. The diaphragm 20 shown in FIGS. 6 and 7 is a flat plate having a front surface
20A and a back surface 20B.
[0034]
The giant magnetostrictive actuator 21 is fixed to the diaphragm 20 by the bracket 22.
Specifically, as shown in FIG. 7, the bracket 22 supports the super magnetostrictive actuator 21
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from the second surface 40B side in a state where the head 45 is in contact with the back surface
20B. Both ends of the bracket 22 are fixed to the diaphragm 20 by fasteners 23 such as bolts
and nuts. In addition, a spring member 25 having a curved shape is fixed to a central portion of
the bracket 22. The top of the curved shape of the spring member 25 is in contact with the
second surface 40 B, and the elasticity of the spring member 25 biases the giant magnetostrictive
actuator 21 toward the diaphragm 20, thereby precluding the giant magnetostrictive element 41.
Weight is given. That is, in the example shown in FIGS. 7 and 8, the spring member 25 presses
the super magnetostrictive actuator 21 toward the diaphragm 20 from the second surface 40B
side, and urges the super magnetostrictive actuator 21 by elasticity, thereby causing super
magnetostriction. It functions as a biasing means for pre-loading the element 41.
[0035]
FIG. 8 is a plan view schematically showing a third example of the outer appearance
configuration of the sound producing device 6, and FIG. 9 is a cross-sectional view showing a
cross-sectional structure with respect to a position along line IX-IX in FIG. Referring to FIGS. 8
and 9, the sound generation device 6 is configured to include a diaphragm 20, a giant
magnetostrictive actuator 21, and an enclosure 50. The diaphragm 20 shown in FIGS. 8 and 9 is
a flat plate having a front surface 20A and a back surface 20B. The four corners of the enclosure
50 are fixed to the diaphragm 20 by fasteners 23 such as bolts and nuts.
[0036]
The enclosure 50 encloses the giant magnetostrictive actuator 21 on the side of the back surface
20B of the diaphragm 20 to accommodate the giant magnetostrictive actuator 21 in the closed
space. Thereby, the propagation of the sound wave output from the back surface 20B side is
blocked by the enclosure 50. As a result, it is possible to avoid a situation in which the sound
pressure is reduced due to the cancellation of the sound wave output from the front surface 20A
side and the sound wave output from the back surface 20B side.
[0037]
A pair of slits 51 is formed in the enclosure 50, and a region sandwiched by the two slits 51
functions as a bracket 52. The giant magnetostrictive actuator 21 is fixed to the diaphragm 20 by
the bracket 52. Specifically, as shown in FIG. 9, the bracket portion 52 supports the super
04-05-2019
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magnetostrictive actuator 21 from the second surface 40B side in a state where the head 45 is in
contact with the back surface 20B. Further, at a central portion of the bracket 52, a flat spring
52A having a curved shape is provided. The top of the curved shape of the plate spring portion
52A is in contact with the second surface 40B, and the super magnetostrictive actuator 21 is
biased toward the diaphragm 20 by the elasticity of the plate spring portion 52A. Is given a preweight. That is, in the example shown in FIGS. 8 and 9, the enclosure 50 (the plate spring 52A)
presses the super magnetostrictive actuator 21 toward the diaphragm 20 from the second
surface 40B side, and biases the super magnetostrictive actuator 21 by elasticity. By doing this, it
functions as biasing means for applying a preload to the giant magnetostrictive element 41.
[0038]
FIG. 10 is a plan view schematically showing a fourth example of the outer appearance
configuration of the sound producing device 6, and FIG. 11 is a cross-sectional view showing a
cross-sectional structure with respect to a position along line XI-XI in FIG. Referring to FIGS. 10
and 11, the sound producing device 6 is configured to include a diaphragm 20, a giant
magnetostrictive actuator 21, and an enclosure 50. The diaphragm 20 shown in FIGS. 10 and 11
is a flat plate having a front surface 20A and a back surface 20B. The four corners of the
enclosure 50 are fixed to the diaphragm 20 by fasteners 23 such as bolts and nuts.
[0039]
The giant magnetostrictive actuator 21 is fixed to the diaphragm 20 by the enclosure 50.
Specifically, as shown in FIG. 11, the enclosure 50 supports the super magnetostrictive actuator
21 from the second surface 40B side in a state where the head 45 is in contact with the back
surface 20B. At a central portion of the enclosure 50, a spring member 25 having a curved shape
is fixed. The top of the curved shape of the spring member 25 is in contact with the second
surface 40 B, and the elasticity of the spring member 25 biases the giant magnetostrictive
actuator 21 toward the diaphragm 20, thereby precluding the giant magnetostrictive element 41.
Weight is given. That is, in the example shown in FIGS. 10 and 11, the spring member 25 presses
the giant magnetostrictive actuator 21 toward the diaphragm 20 from the second surface 40B
side, and biases the giant magnetostrictive actuator 21 by elasticity to cause giant
magnetostriction. It functions as a biasing means for pre-loading the element 41.
[0040]
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Referring to FIG. 2, when the vehicle 1 is traveling at a constant speed or less, a detection signal
S1 indicating a traveling speed of the constant speed or less is input from the vehicle speed
sensor 3 to the control device 4 and the control device 4 An audio signal S3 relating to a
notification sound is output from the sound source 10 by the control signal S2. The audio signal
S3 is amplified by the amplifier 11, and then input to the sound producing device 6 through the
wire harness. Referring to FIG. 5, drive coil 42 generates a magnetic field corresponding to audio
signal S 3, and when the magnetic field is applied to giant magnetostrictive element 41, giant
magnetostrictive element 41 expands and contracts in the axial direction. The head 45 vibrates
in the vertical direction along with the expansion and contraction of the giant magnetostrictive
element 41, and by vibrating the diaphragm 20, a predetermined notification sound is output
(sounded) from the diaphragm 20.
[0041]
FIG. 12 is a perspective view showing another structure of the diaphragm 20. As shown in FIG.
FIG. 13 is a cross-sectional view showing an example using the diaphragm 20 shown in FIG. 12
corresponding to FIG. The diaphragm 20 shown in FIGS. 12 and 13 has a planar central portion
60 and a peripheral portion 61 bent toward the back surface 20B so as to stand vertically (or
almost perpendicularly) from the central portion 60. . In addition, it is also possible to replace
with the diaphragm 20 shown to FIGS. 6-11, and to use the diaphragm 20 shown in FIG.
[0042]
As described above, according to the sound generation device 6 in accordance with the present
embodiment, the biasing means moves the second surface 40B of the case 40 to the diaphragm
20 while the head 45 is in contact with the back surface 20B of the diaphragm 20. By pressing
the giant magnetostrictive actuator 21 in a directed manner, a preload is applied to the giant
magnetostrictive element 41. As described above, since the biasing means is disposed outside the
case 40 of the giant magnetostrictive actuator 21, there is no need to disassemble the giant
magnetostrictive actuator 21 at the time of adjusting the preload, so the adjustment of the
preload is facilitated. It is possible to do Further, since it is not necessary to arrange a coil spring
for applying a preload in the case 40, the structure of the giant magnetostrictive actuator 21 can
be simplified. Further, since the coil spring is unnecessary, the number of parts of the giant
magnetostrictive actuator 21 can be reduced, and the manufacturing cost can be reduced.
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[0043]
Further, according to the example shown in FIGS. 3 and 4, since the bracket 22 (supporting
member) is disposed outside the case 40 of the giant magnetostrictive actuator 21, adjustment of
preload by replacing the bracket 22, etc. Can be done easily. Further, by using the bracket 22 as
a biasing means, the number of parts of the sound producing device 6 can be reduced, and the
manufacturing cost can be reduced.
[0044]
Further, according to the example shown in FIGS. 6 and 7, since the spring member 25 (elastic
member) is disposed outside the case 40 of the giant magnetostrictive actuator 21, preloading is
achieved by replacing the spring member 25 or the like. Can be easily adjusted.
[0045]
Further, according to the example shown in FIGS. 8 and 9, since the enclosure 50 (covering
member) is disposed outside the case 40 of the giant magnetostrictive actuator 21, adjustment of
the preload by replacing the enclosure 50, etc. Can be done easily.
Further, by using the enclosure 50 as a biasing means, the number of parts of the sound
producing device 6 can be reduced, and the manufacturing cost can be reduced.
[0046]
Further, according to the examples shown in FIGS. 10 and 11, since the enclosure 50 is disposed
outside the case 40 of the giant magnetostrictive actuator 21, it is possible to easily adjust the
preload by replacing the enclosure 50 or the like. It becomes possible.
[0047]
Further, according to the example shown in FIGS. 12 and 13, the diaphragm 20 has a planar
central portion 60 and a peripheral portion 61 bent so as to stand from the central portion 60.
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As described above, by bending the peripheral portion 61 of the diaphragm 20, the rigidity of the
diaphragm 20 can be increased without increasing the plate thickness, so that the notification
sound with large sound pressure can be output from the diaphragm 20. It becomes possible.
Further, the propagation of the sound wave output from the back surface 20 B side is hindered
by the peripheral portion 61. Therefore, it is possible to avoid a situation in which the sound
pressure is reduced due to the cancellation of the sound wave output from the front surface 20A
side and the sound wave output from the back surface 20B side.
[0048]
It should be understood that the embodiments disclosed herein are illustrative and nonrestrictive in every respect. The scope of the present invention is indicated not by the meaning
described above but by the claims, and is intended to include all the modifications within the
meaning and scope equivalent to the claims.
[0049]
Reference Signs List 1 vehicle 2 vehicle presence notification device 4 control device 5 signal
processing device 6 sound generation device 10 sound source 20 diaphragm 20B back surface
21 super magnetostrictive actuator 22 bracket 22A, 52A plate spring portion 25 spring member
30 through hole 40 case 40A first surface 40B fourth 2 faces 41 giant magnetostrictive element
45 head 50 enclosure
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