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JP2005328209

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DESCRIPTION JP2005328209
[PROBLEMS] To provide a sound wave generator having a simple configuration using a giant
magnetostrictive vibrator. A sound wave generator T has a super magnetostrictive vibrator 20
disposed on one end side of a lever 10 swingably supported on the surface of a diaphragm 1
fixed to a frame 3 to form a power point portion 12; The end side is brought into contact with the
diaphragm 1 to form an action point portion 13. The contact part 14 in the action point part 13
is detachable. A biasing means 15 such as a spring is attached to the action point 13 to always
elastically press the action point 13 against the surface of the diaphragm 1. When a control
current is applied to the giant magnetostrictive vibrator 20 to vibrate it, the lever 10 swings and
the contact portion 14 of the action point portion 13 intermittently collides with the surface of
the diaphragm 1 or gives a pressing force. , Generate sound waves. Since the displacement of the
giant magnetostrictive vibrator 20 is amplified by the lever 10, the diaphragm 1 can be vibrated
with a large amplitude. Since the action point portion 13 of the lever 10 is elastically biased by
the biasing means 15, the vibration of the lever 10 can be reliably transmitted to the diaphragm
1. [Selected figure] Figure 1
Sound wave generator
[0001]
The present invention relates to a sound wave generator using a giant magnetostrictive vibrator,
in which the structure is simplified and made compact.
[0002]
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1
The phenomenon in which a magnetic body is elastically deformed by the influence of a magnetic
field from the outside is called magnetostriction, and a material having a relatively large
magnetostriction is called a magnetostrictive material.
Further, a substance having a significantly large degree of magnetostrictive deformation is
particularly referred to as a super magnetostrictive material, and a single crystal alloy of terbium
Tb-dysprosium Dy-iron Fe system is conventionally known. Such magnetostrictive material or
super-magnetostrictive material is used as a drive source of a vibrator, an actuator, a transducer
or the like.
[0003]
By the way, when a sufficient amount of displacement can not be obtained only by
magnetostrictive deformation, an attempt is made to enlarge the amount of displacement using
an appropriate amplification mechanism. For example, in Patent Document 1, one end of a lever
is connected to the displacement portion of an actuator using a magnetostrictive element or a
giant magnetostrictive element, one end of an output shaft is connected to the action point of this
lever, and vibration is generated at the other end of the output shaft. The speaker of the structure
which connected the board is described. With this configuration, it is possible to vibrate the
diaphragm with a large amplitude by expanding the displacement amount of the
magnetostrictive element or the super magnetostrictive element used for the actuator using the
principle of leverage. Unexamined-Japanese-Patent No. 5-236595
[0004]
The speaker described in Patent Document 1 has a driving mechanism for vibrating the
diaphragm, which includes an actuator, a lever and an output shaft, and supports a lever for
supporting the lever for amplifying the displacement amount of the magnetostrictive element or
super magnetostrictive element used for the actuator. The structure which provides the container
which accommodates the said drive mechanism, and connects a diaphragm and lever with an
output shaft is used. For this reason, there is a problem that a drive mechanism becomes bulky
and an installation place is restricted.
[0005]
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2
An object of the present invention is, in a sound wave generator using a giant magnetostrictive
element as a drive source, to provide means capable of simplifying the configuration and
reducing the bulk. The feature of the sound wave generator according to the present invention is
that it is provided in a diaphragm, a lever pivotally supported by a fulcrum provided on the
diaphragm, and a power point unit set on the lever It consists of a giant magnetostrictive
vibrator, and when the point of force of the lever is vibrated by the giant magnetostrictive
vibrator, the point of action set at one end of the lever intermittently applies a pressing force to
the surface of the diaphragm. It is set to.
[0006]
In the sound wave generator according to the present invention, a force point portion which is
inclined with respect to the longitudinal direction of the lever is formed at an end different from
the action point portion of the lever, and a super magnetostrictive vibrator is provided at the
force point. You can also
[0007]
An urging means may be provided for elastically pressing the action point set at one end of the
lever to the surface of the diaphragm.
[0008]
Furthermore, it is also possible to change the material or the shape of at least a portion of the
point of action of the lever that abuts against the diaphragm.
[0009]
Since the sound wave generator according to the present invention uses a giant magnetostrictive
vibrator using a giant magnetostrictive material as a drive source of the diaphragm, a large
output can be obtained even with a small size vibrator.
Then, since the vibration of this giant magnetostrictive vibrator is amplified by the lever, it is
possible to vibrate the diaphragm with a large amplitude.
Since the fulcrum portion of the lever is provided on the diaphragm, the number of members can
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be reduced and the size can be easily reduced.
[0010]
If a force point portion inclined to the longitudinal direction of the lever is formed at an end
portion different from the action point portion of the lever, and the giant magnetostrictive
vibrator is provided at the force point portion, the entire thickness should be reduced. Is possible.
[0011]
When an urging means for elastically pressing the action point set at one end of the lever to the
surface of the diaphragm is provided, vibration energy of the lever is vibrated regardless of the
posture of the sound wave generator. It can be reliably transmitted to the board.
[0012]
Furthermore, when the material or shape of at least the portion of the point of action of the lever
that contacts the diaphragm can be changed, the timbre and / or size of the sound generated
when the lever collides with the diaphragm can be changed. It becomes possible.
[0013]
First Embodiment FIG. 1 shows an example of a sound wave generator T according to the present
invention.
In this sound wave generator T, a support 2 is provided on the surface of the diaphragm 1
appropriately fixed to the frame 3, and the lever 10 is swingably supported by the support 2 to
form the fulcrum 11 of the lever 10. The super magnetostrictive vibrator 20 is disposed on one
end side of the lever 10 to form a power point unit 12, and the other end side of the lever 10 is
made to abut on the diaphragm 1 to form an action point portion 13.
The contact portion 14 with the diaphragm 1 at the action point portion 13 is a detachable
member, and can be replaced by a different material and / or shape as required.
Further, biasing means 15 such as a spring is attached to the action point portion 13 so that the
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4
action point portion 13 is always elastically pressed to the surface of the diaphragm 1.
If desired, the auxiliary diaphragm 4 may be disposed to face the diaphragm 1 with the frame 3
interposed therebetween to improve the acoustic characteristics.
[0014]
As the diaphragm 1 and the auxiliary diaphragm 4, a metal plate, a plastic plate, a wood plate, a
resin-coated fiber plate, a resin-coated paper or the like is used, and one having appropriate
vibration characteristics is selected according to the application. Further, in the case of the hard
diaphragm 1 and / or the auxiliary diaphragm 4, it is also conceivable to form an aperture for
sound diffusion.
[0015]
The lever 10 is made of a material such as metal, plastic, FRP, ceramic, wood, a composite
material of these and the like which is excellent in rigidity and hardly causes elastic deformation.
The contact portion 14 at the action point portion 13 of the lever 10 can be made removable by
using, for example, a structure such as a screw if desired, and can be replaced with a different
material and / or shape. By changing the material and shape of the contact portion 14, it is
possible to make the acoustic characteristics of the sound generated from the diaphragm 1
different when the lever 10 collides. Although only the contact portion 14 may be replaced, it
does not prevent one end of the lever 10 including the action point portion 13 or the entire lever
10.
[0016]
Among the above configurations, the auxiliary diaphragm 4 and the biasing means 15 can be
omitted depending on the situation.
[0017]
The giant magnetostrictive vibrator 20 is also referred to as an actuator or a transducer, and has
a structure in which, for example, a giant magnetostrictive element of terbium Tb-dysprosium
Dy-iron Fe system is used as a drive rod and a coil is disposed around it. Be done.
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[0018]
When the sound wave generator T configured as described above applies a control current of a
predetermined frequency to the giant magnetostrictive vibrator 20 to drive it, the giant
magnetostrictive vibrator 20 vibrates the power point portion 12 of the lever 10.
As a result, the lever 10 swings and the contact portion 14 of the action point portion 13
intermittently collides with the surface of the diaphragm 1 or applies a pressing force, and a
sound wave is generated from the diaphragm 1.
Since the displacement amount of the drive portion of the giant magnetostrictive vibrator 20 is
amplified by the lever 10 based on the principle of leverage, the diaphragm 1 can be vibrated
with a large amplitude, and as a result, it occurs conventionally in the giant magnetostrictive
vibrator It is possible to obtain a low frequency which has been difficult to cause using a giant
magnetostrictive vibrator.
[0019]
By replacing the contact portion 14 attached to the action point portion 13 of the lever 10 with a
different material and / or shape, the lever 10 swings and the contact portion 14 collides with
the surface of the diaphragm 1 You can change the timbre and size of the sound generated when
you For example, by making the contact portion 14 a hard material or a sharp shape, the sound
of the sound generated from the diaphragm 1 becomes relatively hard, and a soft material or a
curved shape or a flat shape By doing this, the sound of the generated sound becomes relatively
soft.
[0020]
In this embodiment, the contact point 14 is always in pressure contact with the surface of the
diaphragm 1 by elastically urging the action point 13 of the lever 10 with the urging means 15
such as a spring. The vibration of the lever 10 can be reliably transmitted to the diaphragm 1.
Therefore, the output of the giant magnetostrictive vibrator 20 is used without waste, and the
loss is small. Further, the biasing means 15 has a function of pressing the contact portion 14 of
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the lever 10 against the diaphragm 1 regardless of the posture of the sound wave generator T.
[0021]
In the embodiment shown in FIG. 1, the support base 16 is provided at the frame 3 position of
the sound wave generator T, and the biasing means 15 such as a spring is attached to the
support base 16 to bias the action point 13 of the lever 10. In addition to the above, the
attachment position of the biasing means 15 is arranged at the power point 12 of the lever 10 as
shown in FIG. 2 or the fulcrum 11 and the action point 13 as shown in FIG. The aspect arrange |
positioned in the middle part of and is also possible.
[0022]
Second Embodiment In the sound wave generator T of the present invention, the position of the
giant magnetostrictive vibrator 20 is the fulcrum point of the lever 10 other than one end of the
lever 10 as exemplified in FIGS. It is also possible to make it intermediate between the unit 11
and the action point unit 13.
Also with this configuration, the vibration generated by the giant magnetostrictive vibrator 20
can be transmitted to the diaphragm 1 in the state where the amplitude is increased by the lever
10, as in the first embodiment.
[0023]
Third Embodiment In the embodiment shown in FIG. 5, a bending portion 17 which is inclined or
orthogonal to the longitudinal direction of the lever 10 is formed at one end of the lever 10 in
the sound wave generator T according to the present invention. The giant magnetostrictive
vibrator 20 is disposed at the bent portion 17. 5 (A), (B) and (C) respectively show modified
examples corresponding to (A), (B) and (C) in FIG. As described above, even if the arrangement of
the giant magnetostrictive vibrator 20 is the bending portion 17, the lever 10 can amplify the
amplitude of the vibration generated by the giant magnetostrictive vibrator 20. Further, in this
example, since the super magnetostrictive vibrator 20 is disposed at the bent portion 17, the
effect that the thickness dimension of the sound wave generator T can be made smaller than the
example of FIG. 1 is obtained. Therefore, this sound wave generator T can be used for embedding
in a door, a wall panel or the like.
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[0024]
It is a schematic block diagram which shows the sound wave generator which concerns on the
1st Embodiment of this invention. It is a schematic block diagram which shows the different
aspect of the sound wave generator which concerns on the 1st Embodiment of this invention. It is
a schematic block diagram which shows the further another aspect of the sound wave generator
which concerns on the 1st Embodiment of this invention. Each of the drawings (A) and (B) is a
schematic configuration view showing a second embodiment of the sound wave generator
according to the present invention. Each of FIGS. (A), (B) and (C) is a schematic configuration
view showing a third embodiment of the sound wave generator according to the present
invention.
Explanation of sign
[0025]
DESCRIPTION OF SYMBOLS T ... Sound wave generator 1 ... Diaphragm 2 ... Bearing part 3 ...
Spacer 4 ... Auxiliary diaphragm 10 ... Lever 11 ... Support point part 12 ... Force point part 13 ...
Action point part 14 ... Abutment part 15 ... A biasing means (spring) 16 ... support stand 17 ...
bent part 20 ... super magnetostrictive vibrator
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