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JP2011084258

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2011084258
An object of the present invention is to notify a passerby or the like outside a vehicle of the
presence of a vehicle as needed while maintaining quietness. Or mass production and cost
reduction of the sounding device for vehicle approach notification. A sounding device for vehicle
approach notification, installed in a vehicle, for notifying an approach of the vehicle outside the
vehicle, using a member 20 constituting a part of the vehicle as a diaphragm; The diaphragm 20
is vibrated by the drive of the electric actuator 22 driven by the control to generate sound.
[Selected figure] Figure 2
Sound generation device for vehicle approach notification
[0001]
The present invention relates to a sound generation device for vehicle approach notification.
[0002]
In current automobiles, an internal combustion engine such as a piston engine is generally used
as a drive source, and in the internal combustion engine, explosion noise of fuel in the piston and
mechanical noise accompanying it are generated.
The explosion noise and the mechanical noise overlap and are emitted to the outside of the
vehicle. Therefore, people outside the vehicle were able to fully recognize the presence of the
vehicle based on these sounds.
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[0003]
However, in the current car society, hybrid vehicles and electric motor vehicles are beginning to
spread because environmental protection efforts are being promoted. In these hybrid vehicles
and electric motor vehicles, the sound emitted from the vehicles themselves is much smaller than
conventional piston engine vehicles. For this reason, while a hybrid vehicle or the like has the
advantage of being quiet, it makes it difficult for a passerby to determine the approach of the
vehicle. As a result, there is an increased risk that a passerby can not recognize the approach of
the vehicle and collides with the vehicle.
[0004]
As measures against these problems, a vehicle approach notification device has been proposed
which has a configuration in which a sounding body, for example, a speaker is attached to a
desired position of a motor vehicle and the sounding body is appropriately operated according to
the traveling state. (See Patent Document 1).
[0005]
JP 2009-40317 (Detailed Description of the Invention)
[0006]
In the vehicle approach notification device disclosed in Patent Document 1, the sound generator
is mounted inside the body of the vehicle.
In this case, in order to generate a sound in a desired direction and cause a passerby to recognize
the presence of a vehicle, the sound pressure is likely to be insufficient or excessive, and the
sound pressure is controlled. It has the disadvantage of being difficult.
Furthermore, the directivity of the sound is diffused, which makes it difficult to confirm the
vehicle's location or the like.
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[0007]
The present invention has been made in view of such problems, and an object of the present
invention is to approach a vehicle for notifying a passerby outside the vehicle of the existence of
a vehicle as needed while maintaining quietness. It is an object of the present invention to
provide a sounding device for notification. Alternatively, it is an object of the present invention to
achieve mass production and cost reduction of a vehicle approach notification sounding device.
[0008]
In order to solve the above problems, one aspect of the present invention is a sounding device for
vehicle approach notification installed in a vehicle for notifying the approach of the vehicle to the
outside of the vehicle, and vibrating a member that constitutes a part of the vehicle It is adopted
as a plate and vibrates the diaphragm by the drive of the electric actuator driven by the control
of the control unit to generate sound.
[0009]
In addition, the electric actuator has a magnetostrictive element that utilizes a magnetostrictive
phenomenon that changes its shape when magnetism is applied, and a drive device for driving
the magnetostrictive element, and vibrates the vibration member through the magnetostrictive
element to produce the vibration member. It is preferable to vibrate the diaphragm by the
vibration of.
[0010]
Further, it is preferable to hold the electric actuator in contact with the diaphragm and to apply
pressure to the electric actuator in the direction of the diaphragm by using a mounting tool
attachable to the diaphragm.
[0011]
Further, the mounting tool has a substantially plate shape, and by fixing the mounting tool to the
diaphragm, pressure is applied to the mounting tool via a contact portion of the electric actuator
with the diaphragm, and the mounting tool is bent. It is preferable to apply a force to the electric
actuator toward the diaphragm by utilizing the restoring force of the bent mounting tool.
[0012]
In addition, it is preferable to fix the mounting tool to the diaphragm by screwing the end of the
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mounting tool on which the electric actuator is mounted or the vicinity of the end.
[0013]
Preferably, the electric actuator is pressurized by inserting a part of the mounting tool on which
the electric actuator is mounted into a gap between members constituting a part of the vehicle.
[0014]
According to the present invention, the presence of a vehicle can be notified to a passer-by
outside the vehicle or the like as needed while maintaining quietness.
In addition, it is possible to achieve mass production and cost reduction of the sound generation
device for vehicle approach notification.
[0015]
BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the sounding
apparatus for vehicle approach notification which concerns on the 1st Embodiment of this
invention, and its control apparatus.
BRIEF DESCRIPTION OF THE DRAWINGS It is the disassembled perspective view which looked at
the sounding device for vehicle approach notification which concerns on the 1st Embodiment of
this invention from front side.
BRIEF DESCRIPTION OF THE DRAWINGS It is the perspective view which looked at the sounding
device for vehicle approach notification which concerns on the 1st Embodiment of this invention
from front side.
FIG. 1 is a perspective view of a sound generation device for informing a vehicle approach
according to a first embodiment of the present invention as viewed from the back side.
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FIG. 5 is a cross-sectional view of the sound generation device for vehicle approach notification
in FIG. 4 taken along line A-A.
It is an enlarged view of the part enclosed with the dashed-dotted line B in FIG. It is a
disassembled perspective view of the magnetostriction drive body in FIG. It is a perspective view
of the magnetostriction drive body in FIG. It is a figure which shows the structure of the
magnetostriction drive body in FIG. 2, an upper stage is a front view, and a lower stage is a side
view. It is a figure which shows the structure of the magnetostriction drive body in FIG. 2, an
upper stage is sectional drawing cut | disconnected by the CC line in the lower stage of FIG. 9,
and a lower stage is a bottom view. It is a figure which shows the structure of the plate-mounted
drive body in FIG. 2, and is a perspective view which shows the state which removed the
magnetostriction drive body from the attachment plate. It is a figure which shows the structure
of the plate drive body in FIG. 2, an upper stage is the perspective view which looked at the plate
drive body from the front side, and the lower stage is the perspective view which looked at the
plate drive body from the back side. FIG. 3 is a plan view of the plate-mounted drive body in FIG.
2; FIG. 3 is a bottom view of the drive with plate in FIG. 2; FIG. 14 is a cross-sectional view of the
plate-mounted driving body in FIG. 13 taken along the line D-D. It is a figure which shows the
sound generation apparatus for vehicle approach notification which concerns on the 2nd
Embodiment of this invention, and is a perspective view before mounting a board-attached drive
body to a bonnet. It is the perspective view which looked at the sound emission device for
vehicles approach information concerning a 2nd embodiment of the present invention from the
back side. FIG. 6 is a plan view of a sound generation device for vehicle approach notification
according to a second embodiment of the present invention. FIG. 19 is a cross-sectional view of
the sound generation device for vehicle approach notification in FIG. 18 taken along the line E-E.
FIG. 20 is an enlarged view of a portion surrounded by a dashed dotted line F in FIG. It is a figure
which shows the sound generation apparatus for vehicle approach notification which concerns
on the 3rd Embodiment of this invention, and is a perspective view before mounting a platemounted drive body to a fender. It is the perspective view which looked at the sound emission
device for vehicles approach information concerning a 3rd embodiment of the present invention
from the back side. FIG. 7 is a plan view of a sound generation device for vehicle approach
notification according to a third embodiment of the present invention. FIG. 24 is a cross-sectional
view of the sound generation device for vehicle approach notification in FIG. 23 cut along the line
G-G. FIG. 25 is an enlarged view of a portion surrounded by a dashed dotted line J in FIG. It is a
figure which shows the sound generation apparatus for vehicle approach notification which
concerns on the 4th Embodiment of this invention, and is a perspective view before mounting a
magnetostriction driving body to a door. It is the perspective view which looked at the sound
generation device for vehicles approach information concerning a 4th embodiment of the present
invention from the back side. FIG. 14 is a plan view of a vehicle approach notification sound
generating device according to a fourth embodiment of the present invention. FIG. 29 is a crosssectional view of the sound generation device for vehicle approach notification in FIG. 28 cut
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along the line K-K. FIG. 30 is an enlarged view of a portion surrounded by an alternate long and
short dash line L in FIG.
[0016]
First Embodiment Hereinafter, a vehicle approach notification sound generating device 1
according to a first embodiment of the present invention will be described with reference to the
drawings. The description of the control device 2 for controlling the vehicle approach notification
sound generating device 1 is also referred to as the vehicle approach notification sound
generation device 1 (hereinafter simply referred to as the sound generation device 1). It carries
out along with the explanation of). Further, in the following description, an arrow in the direction
of arrow X1 shown in FIGS. 2 to 30 is "front", the direction of arrow X2 is "back", and an arrow in
a direction orthogonal to both directions of X1 and X2 The indication Y1 direction is defined as
“left”, the arrow Y2 direction as “right”, the arrow Z1 direction as a direction orthogonal to
the XY plane as “upper”, and the arrow Z2 direction as “lower”.
[0017]
First, a schematic configuration of the sound generation device 1 and the control device 2 as an
example of the control unit will be described. FIG. 1 is a block diagram showing the configuration
of a sound producing device 1 and a control device 2 according to an embodiment of the present
invention.
[0018]
The sound generation device 1 is a device for generating a notification sound to notify a passerby
or the like of the presence of the vehicle when a vehicle (not shown) approaches a passerby or
the like outside the vehicle. In the present embodiment, the sound generation device 1 is
configured to vibrate the license plate 20 of the vehicle to output sound. As shown in FIG. 1, a
tone that is a notification sound output from the tone generation device 1 is controlled by an
operation signal transmitted by the control device 2 linked to the rotation detection device of the
engine and / or the motor. In addition, the vehicle is provided with a microphone 4 for detecting
voice outside the vehicle. The output of the operation signal in the control device 2 is performed
based on the audio signal detected by the microphone 4.
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[0019]
The microphone 4 can, for example, be attached to the front part of the vehicle. The microphone
4 is electrically connected to the control device 2. As described above, the sound producing
device 1 has a configuration in which the license plate 20 on the front and / or the rear of the
vehicle is used as a diaphragm. That is, it is a sound generating device in which the number plate
20 is a diaphragm. The detailed configuration of the sound generation device 1 will be described
later.
[0020]
As shown in FIG. 1, the control device 2 performs sound pressure adjustment for adjusting the
sound pressure level output from the sound generation signal generator 10 for generating a
notification sound, the amplification device 11, and the sound generation device 1. And means
12.
[0021]
In the sound generation signal generator 10, an audio signal output from the sound generator 1
is generated.
The sound generation signal generator 10 can generate, for example, a rectangular wave signal
from audio data stored in a built-in memory, and the sound generation signal generator 10 is
additionally provided with a rectangular wave generator (not shown). . The generated audio
signal is transmitted to the amplification device 11, and its sound pressure is adjusted.
[0022]
The amplification device 11 is connected to the sound generation device 1, and the sound signal
amplified by the amplification device 11 is generated from the sound generation device 1 as a
notification sound to the outside of the vehicle.
[0023]
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The sound pressure adjustment means 12 includes a reference voltage device 13, a signal
comparator 14, and a sound pressure controller 15.
In the reference voltage generator 13, a predetermined reference voltage (reference sound
pressure) is stored in advance. The signal comparator 14 compares, for example, an audio signal
voltage (sound pressure) of an audio signal detected by the microphone 4 with a reference
voltage (reference sound pressure) of the reference voltage generator 13 to calculate a difference
V thereof. In the present embodiment, when the microphone 4 detects that the engine sound of
the car is a sufficiently loud sound, control is performed so that the notification sound is not
output from the sound generation device 1. That is, when the difference V between the audio
signal voltage (sound pressure) and the reference voltage (reference sound pressure) indicates a
large value, the notification sound is not output from the sound generation device 1.
[0024]
Further, the sound pressure controller 15 is connected to the amplification device 11, and
changes the amplification factor of the amplification device 11 based on the difference V
between the audio signal voltage and the reference voltage. Control the sound pressure. That is,
the sound pressure controller 15 controls the sound pressure level of the sound output from the
sound generation device 1 based on the difference V between the sound signal voltage (sound
pressure) and the reference voltage (reference sound pressure). . In the present embodiment,
although the rectangular wave generator (not shown) is juxtaposed to the sound generation
signal generator 10, for example, a triangular sound generation signal can be output according to
the selection of the tone and the purpose. It is possible to freely design or select the form of the
sound generation signal generator 10 by, for example, additionally providing a device.
[0025]
Next, the configuration of the sound producing device 1 will be described in detail based on FIG.
2 to FIG. FIG. 2 is an exploded perspective view of the sound producing device 1 as viewed from
the front side. FIG. 3 is a perspective view of the sound producing device 1 as viewed from the
front side. FIG. 4 is a perspective view of the sound producing device 1 as viewed from the back
side. FIG. 5 is a cross-sectional view of the sound generation device 1 in FIG. 4 cut along the line
A-A. FIG. 6 is an enlarged view of a portion surrounded by an alternate long and short dash line B
in FIG.
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[0026]
As shown in FIGS. 2 to 4, the sound producing device 1 is referred to as a license plate 20
(hereinafter simply referred to as a plate 20) of a vehicle (not shown). ) Is adopted as a plane
diaphragm, and the plate 20 is configured to generate a rectangular wave sound. Specifically, the
sound producing device 1 includes the above-described flat plate 20, and a plate-mounted
driving body 21 disposed on the back side of the plate 20 for vibrating the plate 20. The platemounted driving body 21 is described as a giant magnetostrictive element actuator 22
(hereinafter simply referred to as a magnetostrictive driving body 22) which is an example of an
electric actuator. And a substantially rectangular mounting plate 23 to which the
magnetostrictive driving body 22 is fixed. As shown in FIG. 2 and the like, the plate-mounted
driving body 21 describes the screw 25 as an in-bumper mounting bracket 24 (hereinafter
simply referred to as a mounting bracket 24) disposed inside a bumper (not shown). Is attached
to the back side of the plate 20 by fastening to the screw holes 30). Note that the giant
magnetostrictive element has a change amount 1000 times larger than that of the
magnetostrictive element when it is magnetized.
[0027]
Specifically, as shown in FIG. 5 and FIG. 6, the plate drive 21 having the magnetostrictive drive
22 attached to the back side of the plate 20 is disposed, and the screws 25 are mounted on the
screw holes 26 of the plate 20 and the mounting plate 23. The magnetostrictive driving body 22
is mounted to the plate 20 by screwing the screw 25 into the screw hole 30 of the mounting
bracket 24 in a state of being inserted into the mounting hole 53 described later. As shown in
FIGS. 5 and 6, in a state where the magnetostrictive driving body 22 is attached to the plate 20, a
vibrating rod 37 of the magnetostrictive driving body 22 described later contacts the plate 20.
[0028]
Further, as shown in FIG. 2, screw holes 26 are provided at two upper positions on the plate 20,
so the screw 25 is also fastened to the other screw hole 26 to which the plate drive body 21 is
not attached. It will be. In the present embodiment, as shown in FIG. 2, a washer 28 having a
thickness of, for example, 1.2 mm is interposed between the plate 20 and the mounting bracket
24. The washer 28 is for preventing the inclination of the plate 20, but since there is no
difference in sound generation, it may be omitted if unnecessary. Then, the plate 20 on which the
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9
magnetostrictive driving body 22 is mounted is mounted on a vehicle body (bumper), and wiring
connection with the magnetostrictive driving body 22 and the driving body transmission device
(not shown) is performed. .
[0029]
As shown in FIG. 2, the plate 20 is disposed on the front side of the sound producing device 1. As
the plate 20, for example, a medium-sized number mark generally used in automobiles is
employed. In addition, it is also possible to employ | adopt plates other than a medium-sized
number mark as the plate 20. The plate 20 is made of an aluminum plate having a rectangular
shape. The external dimensions of the plate 20 are preferably, for example, 165 mm in the
vertical direction, 330 mm in the horizontal direction, and 1 mm in thickness.
[0030]
Next, the configuration of the magnetostrictive driving body 22 will be described. FIG. 7 is an
exploded perspective view of the magnetostrictive driving body 22. As shown in FIG. FIG. 8 is a
perspective view of the magnetostrictive driving body 22. FIG. FIG. 9 is a diagram showing the
configuration of the magnetostrictive driving body 22, the upper stage is a front view, and the
lower stage is a side view. FIG. 10 is a diagram showing the configuration of the magnetostrictive
driving body 22. The upper part is a cross-sectional view of the lower magnetostrictive driving
body 22 in FIG. 9 taken along line C-C, and the lower part is a bottom view.
[0031]
As shown in FIG. 7, the magnetostrictive drive body 22 includes a case 31, a drive coil 32 as an
example of a drive device disposed in the case 31, and a super magnetostrictive element inserted
at the center of the drive coil 32. 33, with a total of two magnets 34A and 34B disposed at the
front end and the rear end of the giant magnetostrictive element 33, and the drive coil 32
disposed in the case 31, for driving A back washer 35 having a center hole 35a disposed on the
front side of the coil 32, a thin cushion material 36 having a center hole 36a disposed on the
front side of the back washer 35, and a substantially rod-shaped vibrating rod 37 as an example
of a vibrating member. And a thick cushion member 40 disposed on the front side of the thin
cushion member 36 so as to sandwich the flange portion 51 of the vibrating rod 37 and a front
washer disposed on the front side of the thick cushion member 40. Has an over 41, the.
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[0032]
The case 31 is open at the front side, and has a bowl shape whose outer shape is a cylindrical
shape.
That is, the case 31 is a bottomed cylindrical case having a cylindrical side portion 42 and a
bottom portion 43 serving as a bottom plate. For this reason, a substantially cylindrical hollow
portion 44 is provided at the center thereof. The outer diameter of the side surface 42 of the case
31 is, for example, 14.8 mm, and the thickness of the bottom 43 is, for example, 1 mm. Further,
the outer diameter dimension (inner diameter dimension of the side surface portion 42) of the
hollow portion 44 is, for example, 12.2 mm, and the depth thereof is, for example, 14 mm. The
case 31 is dimensioned so that the drive coil 32 described above can be inserted. In addition, as a
material of case 31, it is preferable to use nonmagnetic materials, such as stainless steel or
aluminum.
[0033]
Further, at the bottom, as shown in the lower part of FIG. 10, elongated holes 45, 45 for enabling
wiring of the coil lead wires 32b, 32b are provided at two places.
[0034]
As described above, in the present embodiment, the drive coil 32 is used as a drive device for
changing the magnetic field generated in the giant magnetostrictive element 33.
In the case of the present embodiment, the drive coil 32 is a bobbinless coil having an inner
diameter of 4 mm, an outer diameter of 12 mm and a height (roll width) of 8 mm as an example
of each dimension. is there. Thus, the drive coil 32 is formed, for example, by winding a copper
wire (winding) covered with an insulating film so that the through hole 32a is formed at the
center. In the case of this embodiment, the drive coil 32 winding start portion and the winding
end portion are the coil lead wires 32b and 32b which can be connected by wiring, as shown in
FIG. 7 and FIG. The coil leads 32 b, 32 b are disposed at one end of the drive coil 32.
[0035]
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For this reason, a coil lead wire (hereinafter referred to as a lead wire). ) 32b and 32b are
specified to be disposed at one end of the drive coil 32, but the arrangement of the lead wires
32b and 32b can be freely set according to the production specification of the drive coil 32. .
Further, in the case of the present embodiment, a bobbinless coil is used as the drive coil 32, but
the form of the drive coil 32 can be freely selected according to the purpose.
[0036]
Further, the external dimensions of the drive coil 32 are formed so as to be insertable into the
hollow portion 44 of the case 31 with a gap. For this reason, the drive coil 32 is attached to the
hollow portion 44 of the case 31 in such a manner as to insert the coil lead wires 32 b and 32 b
into the long holes 45 and 45. Then, in a state where the lower end portion of the drive coil 32 is
in contact with the bottom portion 43, the back washer 35 is disposed at the upper end portion
of the drive coil 32.
[0037]
The back washer 35 has a substantially ring shape, and a central hole 35 a is formed at the
center of the back washer 35. The back washer 35 is an iron washer having an inner diameter of
4 mm, an outer diameter of 12.2 mm, and a thickness of 1 mm, as an example of each dimension.
The external dimension of the back washer 35 is set to a tolerance that can be press-fit to the
hollow portion 44 of the case 31, and the back washer 35 is press-fit mounted in the hollow
portion 44. This press fit and attachment can be performed, for example, using a press fit jig
while controlling the press fit depth. Thus, by press-fitting the back washer 35, the front and
back surfaces of the drive coil 32 are held between the front surface (back surface) of the back
washer 35 and the inner side surface of the bottom portion 43 of the case 31 and a
predetermined pressure state become. The drive coil 32 is mounted in a state of being positioned
in the case 31 by being in such a compressed state. In addition, illustration of wiring of the end
part of lead wire 32b, 32b and the wire for input signals shall be abbreviate | omitted.
[0038]
Further, as shown in FIG. 7 and the like, the giant magnetostrictive element 33 mounted with the
above-described magnets 34A and 34B is inserted into the through hole 32a of the drive coil 32.
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The giant magnetostrictive element 33 is, for example, in the form of a hexagonal prism having a
diagonal of 3.5 mm and a length of 6 mm. Further, in order to apply a static magnetic field to the
giant magnetostrictive element 33, two magnets 34A and 34B in total are disposed one each at
the end on the front side and the end on the rear side of the giant magnetostrictive element 33.
The magnets 34A and 34B are neodymium magnets having a diameter of, for example, 3 mm and
a disk shape of, for example, a thickness of 1 mm, and magnetized in the thickness (front and
back) direction.
[0039]
As described above, since the magnets 34A and 34B are magnetized in the thickness direction,
one circular surface of the disk is an N pole, and the other circular surface (rear surface) is an S
pole. When mounting the magnets 34A and 34B, one of the two magnets 34A and 34B is closely
attached to the surface of one end of the giant magnetostrictive element 33 so that the side of
the S pole faces the surface: The other of the two magnets 34A and 34B is closely attached so
that the N pole side faces the other end surface of the giant magnetostrictive element 33. The
mounting of the magnets 34A and 34B to the giant magnetostrictive element 33 is performed
such that the central axes of the magnets 34A and 34B and the giant magnetostrictive element
33 coincide with each other as shown in FIG.
[0040]
As described above, since the magnets 34A and 34B are magnetized, they adhere to the
respective end portions of the giant magnetostrictive element 33 by the action of the magnetic
attraction force. Then, due to the magnetism of the magnets 34A and 34B, a magnetic field
flowing from the N pole side to the S pole side of the magnets 34A and 34B is generated on the
inner side of the giant magnetostrictive element 33 and the outer side of the giant
magnetostrictive element 33. The giant magnetostrictive element 33 mounted with the magnets
34A and 34B is inserted into the through hole 32a of the drive coil 32. In this state, the magnet
34 B contacts the bottom 43 of the case 31. In the present embodiment, the giant
magnetostrictive element 33 mounted with the magnets 34A and 34B is disposed in the through
hole 32a such that the south pole of the magnet 34B is positioned on the bottom 43 side of the
case 31.
[0041]
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With the super magnetostrictive element 33 to which the magnets 34A and 34B are mounted
inserted in the through holes 32a of the drive coil 32, as shown in the upper part of FIG. 10, the
back washer 35 is placed on the front side of the drive coil 32. The thin cushion member 36 is
disposed via the through holes. The thin cushion material 36 has a substantially ring shape, and
a central hole 36 a is formed at the center of the thin cushion material 36. The outer shape of the
thin cushion material 36 is, as an example of dimensions, formed to have an inner diameter of 3
mm, an outer diameter of 12.1 mm and a thickness of 1.5 mm.
[0042]
As shown in FIGS. 7 and 10, the columnar portion 50 of the vibrating rod 37 is inserted into the
central hole 36a of the thin cushion material 36. The vibrating rod 37 has, for example, a
columnar portion 50 having a columnar shape with a height dimension of about 7.5 mm and a
diameter dimension of about 3 mm, and radially outward from a midway portion in the
longitudinal direction of the columnar portion 50 And a flange 51 extending like a disc having a
radius of, for example, about 3 mm. The thickness dimension of the collar 51 is, for example, 1.0
mm. The columnar portion 50 is a front columnar portion 50a at a portion in the front direction
with respect to the ridge portion 51, and a portion at the back direction side with respect to the
ridge portion 51 is a back columnar portion 50b. The flange portion 51 is provided at a position
of, for example, 2 mm from the back side end of the columnar portion 50 toward the front side.
[0043]
In the vibrating rod 37, the back columnar portion 50b is inserted from the front side of the
central hole 36a of the thin cushion material 36. Further, the vibrating rod 37 is inserted until
the flange 51 abuts on the thin cushion member 36. In a state where the collar portion 51 abuts
on the thin cushion member 36, the back columnar portion 50b passes through the central hole
35a and abuts on the front surface of the magnet 34A.
[0044]
A thick cushioning material 40 is disposed on the front side of the back washer 35. The thick
cushioning material 40 has a substantially ring shape as in the case of the thin cushioning
material 36, and a central hole 40a is formed at the center of the thick cushioning material 40.
04-05-2019
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The outer shape of the thick cushion member 40 is, for example, formed to have an inner
diameter of 3 mm, an outer diameter of 12.1 mm, and a thickness of 3.5 mm as an example of
dimensions. The thick cushion member 40 is disposed on the front side of the back washer 35 in
such a manner that the upper columnar portion 50a of the vibrating rod 37 is inserted into the
through hole 40a. That is, the thick cushion member 40 is inserted into the case 31 so as to
press the thick cushion member 40 against the collar portion 37 a while inserting the upper
columnar portion 50 a into the through hole 40 a of the thick cushion member 40.
[0045]
Further, as shown in FIGS. 7 and 10, the front washer 41 is press-fit to the case 31 at the upper
end of the thick cushion member 40. The front washer 41 is, for example, an iron washer having
an inner diameter of 3.05 mm, for example, an outer diameter of 12.1 mm and a thickness of, for
example, 1 mm. The outer diameter of the front washer 41 is set to a press-fit tolerance. In the
case of the present embodiment, at the time of press-fitting, the front washer 41 is press-fitted so
as to be flush with the front end of the case 31 using a press-fitting jig. Thus, by pressing the
front washer 41, the thick cushion material 40 and the thin cushion material 36 are crushed
toward the back side, and the bottom of the back columnar portion 50b of the vibrating rod 37 is
pressed against the magnet 34A. .
[0046]
Furthermore, the magnetostrictive element 33 in contact with the magnet 34 A and the magnet
34 B in contact with the back end of the magnetostrictive element 33 are pressed against the
bottom portion 43 of the case 31. As a result, the central portion in the case 31 is pressurized by
both the vibrating rod 37 and the giant magnetostrictive element 33 to which the magnets 34A
and 34B are attached. As described above, when the front washer 41 is press-fit into the case 31,
the central portion in the case 31 is pressurized, and the magnetostrictive driving body 22 is
completed. At this time, the front end of the front columnar portion 50 a protrudes from the
through hole 41 a of the front washer 41 toward the front side. In the present embodiment, an
independently foamable urethane is employed as the cushioning material. Further, in the case of
the present embodiment, the cushion members 36 and 40 are used to obtain pressurization, but
it is acceptable to use a coil spring, a disc spring or the like conventionally used according to the
purpose. .
[0047]
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Here, when the magnetic flux in the magnetic field generated inside the giant magnetostrictive
element 33 and the outer side of the giant magnetostrictive element 33 is changed, the giant
magnetostrictive element 33 reacts with the change of the magnetic flux. Then, the shape of the
giant magnetostrictive element 33 changes, and the magnets 34A and 34B and the giant
magnetostrictive element 33 move in the front and back direction along with the change in the
length direction. Therefore, the vibrating rod 37 reciprocates in the front and back direction via
the magnets 34A and 34B and the giant magnetostrictive element 33, and the vibration is
transmitted to the plate 20 which is an example of the vibrating plate.
[0048]
Next, the configuration of the plate-mounted driving body 21 in which the magnetostrictive
driving body 22 is fixed to the mounting plate 23 will be described. FIG. 11 is a view showing the
configuration of the plate-mounted driving body 21 and a perspective view showing a state in
which the magnetostrictive driving body 22 is removed from the mounting plate 23. FIG. 12 is a
view showing the configuration of the plate-mounted drive body 21, the upper stage is a
perspective view of the plate-mounted drive body 21 as viewed from the front side, and the lower
stage is a perspective view of the plate-mounted drive body 21 as viewed from the back side. FIG.
13 is a plan view of the plate drive body 21. As shown in FIG. FIG. 14 is a bottom view of the
plate driving body 21. As shown in FIG. FIG. 15 is a cross-sectional view of the plate-mounted
driving body 21 in FIG. 13 taken along the line D-D.
[0049]
As described above, the magnetostrictive driving body 22 is mounted on the plate 20 in a state of
being fixed to the mounting plate 23 (see FIGS. 2 to 6 and 11 to 14). The mounting plate 23 is,
for example, an iron plate having a thickness of 1 mm, and its width is, for example, 18 mm, and
its length is, for example, 88 mm. The mounting plate 23 has a substantially rectangular shape in
plan view. In the vicinity of the lower end portion of the mounting plate 23, a press-fit hole 52
having a diameter of 14.8 mm, for example, is provided on the center line along the rectangular
longitudinal direction. Further, in the vicinity of the upper end portion of the mounting plate 23,
for example, a mounting hole 53 having a diameter of 5.5 mm is provided on a center line along
the rectangular longitudinal direction. In addition, a stepped portion 54 is provided so as to be
lowered by, for example, about 2.5 mm at a position directed by, for example, about 20 mm from
the upper end to the lower end side. Since the press-fit holes 52 are set to a tolerance that allows
04-05-2019
16
press-fit, it is possible to fit the outer peripheral portion of the case 31 of the magnetostrictive
driving body 22 into the press-fit holes 52 and press fit.
[0050]
As shown in FIG. 15, a flange 55 having a thickness of, for example, 1 mm and a protruding
width of, for example, 0.5 mm is provided at the upper end of the outer peripheral portion of the
case 31. Therefore, when the magnetostrictive driving body 22 is inserted into the press-fit hole
52, the flange portion 55 is caught on the mounting plate 23. Therefore, the flange portion 55
exerts a stopper function, and the magnetostrictive driving body 22 is press-fitted to the
mounting plate 23 to a predetermined position, and the mounting of the magnetostrictive driving
body 22 on the mounting plate 23 is completed. Thus, the plate-mounted driving body 21 is
manufactured. In the present embodiment, as the method of mounting the magnetostrictive
driving body 22 to the mounting plate 23, the press-in method was used, but the mounting
method is not limited to this. Screwing, welding, integral production with the case 31, etc. It can
be freely created according to the purpose.
[0051]
As described above, the plate-mounted drive body 21 is mounted on the back side of the plate 20
using the screw 25 and the mounting bracket 24. As shown in FIGS. 5 and 6, when the
magnetostrictive driving body 22 is attached to the plate 20, the front columnar portion 50 a of
the vibrating rod 37 of the magnetostrictive driving body 22 contacts the plate 20. Specifically,
the screws 25 are generally used for mounting the plate 20. The plate drive body 21 is a plate by
fastening the screw 25 in the screw hole 30 of the mounting bracket 24 while inserting the
screw 25 into the screw hole 26 and the mounting hole 53 of the mounting plate 23 provided in
the plate 20. It is attached to 20.
[0052]
When the plate driver 21 is attached to the plate 20 using the screw 25, the vibrating rod 37 is
in contact with the plate 20, the mounting plate 23 is slightly bent, and the magnetostrictive
driving member is bent by the restoring force of the bent mounting plate 23. 22 is pressed
against the back of the plate 20. That is, the end of the front columnar portion 50 a of the
vibrating rod 37 is strongly pressed to the back surface of the plate 20 by the restoring force of
04-05-2019
17
the mounting plate 23.
[0053]
Then, when an input signal is applied to the drive coil 32 in the magnetostrictive drive body 22, a
magnetism is generated accordingly, and the magnetostrictive element generated by the magnets
34A and 34B mounted on the magnetostrictive element 33. A change occurs in the magnetic
field in 33. Then, along with this, the giant magnetostrictive element 33 undergoes expansion or
contraction change, and the change is transmitted to the vibrating rod 37. That is, the vibrating
rod moves the plate 20 by the movement of the vibrating rod in accordance with the shape
change of the giant magnetostrictive element 33. Therefore, in addition to the pressure force
with the vibrating rod 37 and the giant magnetostrictive element 33 (including the magnets 34A
and 34B), the balance of the pressure force with the vibrating rod 37 and the plate 20 affects the
sound pressure, the reproduction frequency characteristic, etc. Exerts As a result, it is necessary
to take into consideration the dimensions of the step portion 54 of the mounting plate 23. In FIG.
6 etc., the vibrating rod 37 and the back surface of the plate 20 are in contact. A slight but
curved deformation, and the step size is set to a tolerance as low as, for example, 0.5 mm. As the
step size increases, the deformation of the mounting plate 23 increases and the pressure force
also increases. However, if the pressure force is too large to be greater than the vibration torque
generated by the giant magnetostrictive element 33, it is difficult to obtain the sound pressure.
For this reason, in the present embodiment, the adjustment is made by the fastening force of the
screw 25. However, the adjustment is not limited to this, as long as specifications such as the
type of vehicle and sound pressure are determined. The optimum dimensions may be set, and the
screw 25 may be completely fastened.
[0054]
Next, an example of the operation of the sound generation device 1 will be described.
[0055]
In the present embodiment, when the power supply (not shown) provided in the vehicle (not
shown) is turned on, the rotation speed detection device (not shown) of the engine and / or
motor provided in the vehicle The rotation number is detected, the rotation number detection
signal is transmitted to the sound generation signal generation device, and the frequency
corresponding to the rotation number detection signal is converted into each frequency signal
stored in the memory incorporated in the sound generation signal generation device 10. Do.
04-05-2019
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Then, the converted frequency signals are transmitted to a rectangular wave generator provided
side by side with the sound generation signal generator 10, reproduced as a rectangular wave
signal, and then output to the amplifier 11. Furthermore, the rectangular wave signal amplified
by the amplification device 11 is sounded out of the vehicle as a notification sound from the
sound generation device 1. In the case of the present embodiment, the rectangular wave
generator is provided side by side, but it is also possible to store it as audio data in a memory.
[0056]
At this time, an audio signal is extracted from the signal of the notification sound outside the
vehicle detected by the microphone 4 of the own vehicle using, for example, a band pass filter.
Further, the signal comparator compares the audio signal voltage (sound pressure) of the
extracted audio signal with the reference voltage (reference sound pressure) preset in the
reference voltage unit, calculates the difference V, It outputs to the pressure controller 15. Then,
the sound pressure controller 15 controls the amplification factor of the amplification device 11
based on the difference V between the audio signal voltage and the reference voltage, and
controls the sound pressure of the notification sound of the own vehicle. As described above, the
audio signal controlled by the control device 2 is transmitted to the sound producing device 1,
and the plate 20 of the sound producing device 1 or the outer plate or the like constituting the
vehicle vibrates and a controlled notification sound is output.
[0057]
In the sound generation device 1 configured as described above, it is possible to generate sound
from the sound generation device 1 while considering the notification sound signal outside the
vehicle detected by the microphone 4 of the own vehicle. That is, in order to notify a passing
person or the like of the notification sound, the control device 2 can control so that a sound
larger than the noise outside the vehicle is generated from the sound generation device 1. For
this reason, it is possible to reliably generate a sound capable of informing the pedestrian or the
like of the presence of the vehicle from the sound generation device 1.
[0058]
04-05-2019
19
Further, in the present embodiment, the sound emitting device 1 is mounted on the license plate
20 of a car, and can output a good sound from the license plate 20. In addition, since the
magnetostrictive driving body 22 is attached to the plate 20 using the mounting plate 23 so that
the vibrating rod 37 of the magnetostrictive driving body 22 can be pressure-fixed to the plate
20, Mass production is possible and cost can be reduced. It is also possible to reduce the number
of manufacturing processes and assembly processes.
[0059]
Further, since the sound generation device 1 can generate the plate 20 of the car, it can be
generated at the outermost side of the vehicle. For this reason, it is possible to generate voice
outside in the state where there is no shield. Therefore, it is possible to efficiently transmit voice
to pedestrians and the like.
[0060]
Further, in the sound generation device 1, since the rectangular wave is emitted from the plate
20 for sound generation, the clarity of sound can be improved more than in the case of the sine
wave.
[0061]
Second Embodiment A sound emitting device 60 according to a second embodiment of the
present invention will be described below with reference to the drawings.
The description of the parts of the sound generation device 60 according to the second
embodiment that are common to the first embodiment will be omitted or simplified.
[0062]
FIG. 16 is a view showing a vehicle approach notification sound generating device 60 according
to a second embodiment of the present invention, and is a perspective view before the platemounted driving body 21 is mounted on the bonnet 61. As shown in FIG. FIG. 17 is a perspective
view of a vehicle approach notification sound producing device 60 according to a second
04-05-2019
20
embodiment of the present invention as viewed from the back side. FIG. 18 is a plan view of a
vehicle approach notification sound producing device 60 according to a second embodiment of
the present invention. FIG. 19 is a cross-sectional view of the vehicle approach notification sound
producing device 60 in FIG. 18 taken along the line E-E. FIG. 20 is an enlarged view of a portion
surrounded by an alternate long and short dash line F in FIG.
[0063]
A sound generation device 60 for informing a vehicle approach according to a second
embodiment of the present invention (hereinafter referred to as a sound generation device 60).
The front bonnet 61 of the vehicle is hereinafter referred to as a bonnet 61, as shown in FIG. 16
to FIG. ) Is regarded as a flat diaphragm, and the bonnet 61 generates a rectangular wave sound.
Specifically, the plate-mounted driving body 21 is mounted on the bonnet 61 using the
reinforcing frame 62. More specifically, the sound-producing device 60 is completed by inserting
the plate-mounted driving body 21 between the bonnet 61 and the reinforcing frame 62 for the
bonnet 61 disposed on the back side of the bonnet 61. The sounding sound to be the notification
sound output from the sounding device 60 is controlled by the operation signal transmitted in
the control device 2 as in the case of the first embodiment. Note that, by performing the wiring
connection between the magnetostrictive driving body 22 and the driving body transmission
device (not shown), the sound generation system in the hood is completed.
[0064]
The reinforcing frame 62 has a form in which the left and right sides of the flat plate are
obliquely mountain-folded in the same direction, as shown in FIGS. Specifically, the reinforcing
frame 62 has a flat portion 63 located at the top and having a plane parallel to the bonnet 61,
and sloped portions 64 and 64 that bend diagonally from the left and right sides of the flat
portion 63 toward the front side There is. Further, flat plate-like flat portions 65, 65 having a
substantially flat shape extend further to the left and right from the outer edge portions of the
slope portions 64, 64, respectively. At the upper and lower ends of the flat weir portion 65, a
total of four rectangular step portions 66 which are lowered by one step in the form of a
rectangular shape toward the front side are provided. When the reinforcing frame 62 is attached
to the bonnet 61, the rectangular stepped portion 66 contacts the back surface of the bonnet 61,
so a gap H is formed between the flat collar portion 65 and the bonnet 61 (see FIG. 20). For this
reason, it becomes possible to insert the plate-attached drive body 21 into the gap H, and by
inserting the plate-attached drive body 21 into the gap H, the sound producing device 60 is
completed. The reinforcing frame 62 may be attached to the rear bonnet of the vehicle to make
04-05-2019
21
the rear bonnet sound.
[0065]
The sound generation device 60 configured as described above is mounted on a hood 61 of a car,
and can output a good sound from the hood 61. In addition, since the drive unit with a plate 21 is
inserted into the gap H of the reinforcing frame 62 attached to the bonnet 61, mass production
of the sound producing device 60 becomes possible and the cost can be reduced. It is also
possible to reduce the number of manufacturing processes and assembly processes.
[0066]
Further, since the sound generation device 60 can generate the bonnet 61 of a car, it can be
made to sound using a member disposed outside the vehicle. Therefore, it is possible to generate
sound to the outside in the absence of a shield. For this reason, it is possible to efficiently
transmit voice to pedestrians and the like.
[0067]
Further, in the sound producing device 60, since the rectangular wave is emitted from the bonnet
61 to produce sound, it is possible to improve the intelligibility of the sound as compared with
the case of the sine wave.
[0068]
Third Embodiment Hereinafter, a sound generation device 70 according to a third embodiment of
the present invention will be described with reference to the drawings.
The description of the parts of the sounding device 70 according to the third embodiment that
are common to the first embodiment will be omitted or simplified.
[0069]
04-05-2019
22
FIG. 21 is a view showing the vehicle approach notification sound generating device 70
according to the third embodiment of the present invention, and is a perspective view before the
plate-mounted driving body 21 is mounted on the fender 71. As shown in FIG. FIG. 22 is a
perspective view of a sound generation device 70 for informing a vehicle approach according to
a third embodiment of the present invention as viewed from the rear side. FIG. 23 is a plan view
of a vehicle approach notification sound generating device 70 according to a third embodiment
of the present invention. FIG. 24 is a cross-sectional view of the sound generation device 70 for
informing a vehicle approach of FIG. 23 taken along the line G-G. FIG. 25 is an enlarged view of a
portion surrounded by an alternate long and short dash line J in FIG.
[0070]
A sound generation device 70 for informing a vehicle approach according to a third embodiment
of the present invention (hereinafter referred to as a sound generation device 70. 21 to 25, the
fender 71 of the vehicle is regarded as a flat diaphragm, and the fender 71 generates a
rectangular wave sound. Specifically, the plate-mounted drive body 21 is configured to be
attached to the fender 71 using the insertion fitting 72. More specifically, the sound-producing
device 60 is completed by inserting the plate driver 21 into the insertion hole 73 of the insertion
fitting 72 previously attached to the back side of the fender 71 by welding. The tone that
becomes the notification sound output from the tone generation device 70 is controlled by the
operation signal transmitted in the control device 2 as in the case of the first embodiment. Note
that, by performing the wiring connection between the magnetostrictive drive 22 and the drive
transmission device (not shown), the sound generation system in the fender 71 is completed.
[0071]
As shown in FIG. 21 and FIG. 22 etc., the insertion fitting 72 has a substantially hat-like form in
which the left and right sides of the flat plate are mountain-folded and the both ends are valleyfolded. Specifically, the insertion fitting 72 has a flat portion 74 located at the top and having a
plane parallel to the fender 71, and right-angled portions 75 and 75 that bend substantially at
right angles from the left and right sides of the flat portion 74 toward the front side A horizontal
portion 76, 76 is formed to be bent outward in the vertical direction from both ends of the
rectangular surfaces 75, 75. The plug fitting 72 thus has a substantially hat-like configuration, so
that a plug-in hole 73 penetrating in the left-right direction is formed between the two rightangled portions 75, 75. The insertion fitting 72 is attached to the fender 71 by welding the
horizontal portions 76, 76. For this reason, the sound-producing device 70 is completed by
04-05-2019
23
inserting the plate-mounted driving body 21 into the insertion hole 73 of the insertion fitting 72
welded to the fender 71. In addition, fixation to the fender 71 of the insertion metal fitting 73
may employ | adopt not only welding but another method. Further, the fitting member 72 may
be attached to a member constituting another vehicle such as a door, and the attached member
may be made to sound.
[0072]
The sound generation device 70 configured as described above is mounted on a fender 71 of a
car, and can output a good sound from the fender 71. In addition, since the drive unit 21 is
inserted into the insertion hole 73 of the insertion fitting 72 attached to the fender 71, mass
production of the sound producing device 70 is possible and the cost can be reduced. Become. It
is also possible to reduce the number of manufacturing processes and assembly processes.
[0073]
Further, since the sound generation device 70 can generate the fender 71 of the car, it can
generate the sound using the outer plate constituting the vehicle. Therefore, it is possible to
generate sound to the outside in the absence of a shield. For this reason, it is possible to
efficiently transmit voice to pedestrians and the like.
[0074]
Further, in the sound producing device 70, since the fender 71 emits a rectangular wave to
produce sound, it is possible to improve the intelligibility of the sound as compared to the case of
the sine wave.
[0075]
Fourth Embodiment Hereinafter, a sound generation device 80 according to a fourth embodiment
of the present invention will be described with reference to the drawings.
The description of the parts of the sounding device 80 according to the third embodiment that
are common to the first embodiment will be omitted or simplified.
04-05-2019
24
[0076]
FIG. 26 is a view showing the vehicle approach notification sound generating device 80
according to the fourth embodiment of the present invention, and is a perspective view before
the magnetostrictive driving body 22 is attached to the door 81. As shown in FIG. FIG. 27 is a
perspective view of a vehicle approach notification sound production apparatus 80 according to
a fourth embodiment of the present invention as viewed from the back side. FIG. 28 is a plan
view of a vehicle approach notification sound production apparatus 80 according to a fourth
embodiment of the present invention. FIG. 29 is a cross-sectional view of the vehicle approach
notification sound producing device 80 in FIG. 28 taken along line K-K. FIG. 30 is an enlarged
view of a portion surrounded by a dashed dotted line L in FIG.
[0077]
A sound generation device 80 for informing a vehicle approach according to a fourth
embodiment of the present invention (hereinafter referred to as a sound generation device 80).
26 to 30), the door 81 (actually the outer plate of the door) of the vehicle is regarded as a flat
diaphragm, and a rectangular wave sound is generated from the door 81. . Specifically, the platemounted driving body 21 is attached to the door 81 using the M-shaped bracket 82. More
specifically, the sound generation device 80 is completed by fitting the magnetostrictive driving
body 22 into the fitting portion 83 of the M-shaped metal fitting 82 previously attached to the
back side of the door 81 by welding. The sound to be the notification sound output from the
sound generation device 80 is controlled by the operation signal transmitted in the control
device 2 as in the first embodiment. Note that, by performing the wiring connection between the
magnetostrictive driving body 22 and the driving body transmission device (not shown), the
sound generation system in the door 81 is completed.
[0078]
The M-shaped metal fitting 82 has a substantially M-shaped form as shown in FIGS. Specifically,
the M-shaped metal fitting 82 has a substantially semi-cylindrical shape, and the opening end in
the lateral direction is further bent diagonally outward, and the fitting portion 83 and the fitting
portion 83 A rectangular plate portion 84 which is bent so as to close the back side of the fitting
portion 83 from the lower end portion upward, and a U-shaped portion extending substantially in
04-05-2019
25
a U shape from both left and right ends of the rectangular plate portion 84 85, 85, and
substantially rectangular contact portions 86, 86 that are bent outward in the left-right direction
from the end portions of the U-shaped portions 85, 85. The M-shaped bracket 82 is attached to
the door 81 by welding the contact portions 86, 86. Therefore, the sound generator 80 is
completed by fitting the magnetostrictive driving body 22 into the storage space of the fitting
portion 83 of the M-shaped metal fitting 82 welded to the door 81. In addition, the fixation to the
door 81 of the M-shaped metal fitting 82 may employ | adopt not only welding but another
method. Further, the M-shaped metal fitting 82 may be attached to a member constituting
another vehicle such as a fender, and the attached member may be made to sound.
[0079]
The sound generation device 80 configured as described above is mounted on a door 81 of a car
and can output a good sound from the door 81. In addition, since the magnetostrictive driving
body 22 is simply fitted into the fitting portion 83 of the M-shaped metal fitting 82 attached to
the door 81, mass production of the sound producing device 80 becomes possible and cost can
be reduced. It becomes. It is also possible to reduce the number of manufacturing processes and
assembly processes.
[0080]
Further, in the sound generation device 80, since it is possible to make the door 81 of the car
sound, it is possible to make it sound using the outer plate that constitutes the vehicle. Therefore,
it is possible to generate sound to the outside in the absence of a shield. For this reason, it is
possible to efficiently transmit voice to pedestrians and the like.
[0081]
Further, in the sound generation device 80, since the door 81 emits sound by generating a
rectangular wave, it is possible to improve the intelligibility of sound more than the case of the
sine wave.
[0082]
As mentioned above, although each embodiment of the present invention was described, the
present invention is not limited to the above-mentioned form, and can be carried out in the form
which changed variously.
04-05-2019
26
[0083]
In each of the above-described embodiments, the plate 20, the bonnet 61, the fender 71 and the
door 81 of the vehicle are made to sound as a diaphragm, but the members of the vehicle to be
made are not limited to these members. It is also possible to produce a plate or bumper that
constitutes the ceiling of a car.
When a bumper is made to sound, in the case of a bumper made of resin in recent years, the
regeneration zone and the sound pressure become low, and in the case of a bumper formed of a
material with little internal loss such as metal, good sounding performance can be obtained.
For this reason, it is possible to easily produce the sound in the vehicle parts by considering the
material, the shape and the like on the premise of the sound production.
[0084]
In each of the above-described embodiments, in order to notify the pedestrian or the like of the
approach of the vehicle, only the sound generated from the sound emitting devices 1, 60, 70, 80
is used. As means for making a notice, the sounds from the sound producing devices 1, 60, 70,
80 and the sound of the horn may be used in combination.
[0085]
Further, in the above-described embodiments, the voices emitted from the sound emitting devices
1, 60, 70, 80 are not given directivity in a specific direction, but may be controlled by the control
device 2, for example, The directivity may be given so that the voice reaches only a
predetermined range in front or diagonally forward.
In particular, when traveling in a residential area, or when quietness such as early morning or
late evening is required, it is preferable to make the voice reach only a predetermined range in
front and / or back.
04-05-2019
27
[0086]
Moreover, in the above-mentioned embodiment, although the noise outside the vehicle is
detected by the microphone 4, the detection method is not limited to that performed by the
microphone 4, and for example, it may be detected by another device such as a vibration sensor.
Also good. Further, although the method of comparing the audio signal voltage (sound pressure)
with the reference voltage (reference sound pressure) is adopted in the present embodiment, the
present invention is not limited to such a method.
[0087]
In each of the above-described embodiments, a giant magnetostrictive actuator is used as the
magnetostrictive drive body 22. However, a common magnetostrictive actuator may be used.
[0088]
1, 60, 70, 80 ... Sound generation device for vehicle approach notification 2 ... Control device
(control unit) 20 .. Number plate (diaphragm) 22 .. Super magnetostrictive actuator,
magnetostrictive drive body (electric actuator) 23: Mounting plate (attachment tool 25: Screw 32:
Drive coil (drive device) 33: Super magnetostrictive element 61: Bonnet (diaphragm) 62:
Reinforcement frame (attachment tool) 71: Fender (diaphragm) 72: Insertion fitting (attachment
tool) 81 ... Door (diaphragm) 82 ... M-shaped bracket (mounting tool)
04-05-2019
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