close

Вход

Забыли?

вход по аккаунту

?

JP2007194686

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
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 JP2007194686
[PROBLEMS] To provide a magnetostrictive element having a simple member configuration and
excellent in efficiency and durability, and a flat acoustic device to which the magnetostrictive
element is applied. A rod-like magnetostrictive material, a conductive coil around the periphery
of the magnetostrictive material, and a conductive coil are energized to convert the axial
displacement of the magnetostrictive material in a direction substantially orthogonal to the axial
direction. The displacement direction conversion member is provided with a direction conversion
member, and first and second movable tip portions that operate by following the axial
displacement of the magnetostrictive material by sandwiching both ends of the bar-like
magnetostrictive material. Is an elastic member having a convex shape in which both ends are
fixed between the first and second movable tip portions and the convex direction is on the
outside with respect to the magnetostrictive material; It is configured that the axial displacement
of the magnetostrictive material at the first and second movable tip portions can be converted to
the direction orthogonal to the axial direction by elastic deformation. [Selected figure] Figure 1
Magnetostrictive element and flat acoustic device provided with the same
[0001]
The present invention improves conversion efficiency and durability, including a drive
mechanism that causes displacement of the magnetostrictive material in the axial direction by
application of a magnetic field, and a displacement direction conversion member that converts
displacement in a direction substantially orthogonal to the displacement direction. The present
invention relates to a magnetostrictive element and a planar acoustic device in which the shape
of the displacement direction conversion member is improved.
04-05-2019
1
[0002]
In recent years, in the field of electro-mechanical conversion technology, attention has been
focused on magnetostrictive elements that enable high-output displacement driving.
Above all, the tendency is remarkable in the technical requirement of the displacement direction
changing mechanism for converting the displacement of the magnetostrictive element in the
other direction (for example, see Patent Document 1).
[0003]
First, a magnetostrictive element provided with a conventional displacement direction conversion
mechanism will be described. FIG. 7 is a structural cross-sectional view showing the structure of
a conventional magnetostrictive element.
[0004]
The conventional magnetostrictive element 26 shown in FIG. 7 includes a magnetostrictive
material 1, a conductive coil 2 wound around the magnetostrictive material 1, and a fixed tip
fixed to one end of the magnetostrictive material 1 inside a housing 10. It has a portion 8 and
movable tip portions 3a and 3b fixed to the other end, and further has a tip guiding portion 14
and a movable wire 12 passing therethrough so as to be inserted into the hollow interior thereof.
[0005]
Here, the fixed distal end portion 8 and the distal end guiding portion 14 are firmly fixed to each
other via the housing 10, and the movable distal end portion 3a and the movable wire 12 are
fixed via the movable distal end portion 3b. .
In addition, since the movable distal end portions 3a and 3b and the movable wire 12 are not
directly fixed to the housing 10 and the distal end guiding portion 14, they can be displaced
independently of each other. Furthermore, the movable wire 12 is made of a bendable member,
and can be made to have an arbitrary shape according to the hollow shape inside the distal end
04-05-2019
2
guiding portion 14.
[0006]
Next, the drive principle of the magnetostrictive element 26 will be described. First, when the
conductive coil 2 is energized, an axial displacement occurs in the magnetostrictive material 1.
Here, since one end of the magnetostrictive material 1 is fixed to the housing 10 through the
fixing tip portion 8, The movable tip portions 3a and 3b are axially displaced in accordance with
the displacement. The displacement of the movable tip portions 3a and 3b acts to displace the
movable wire 12 in the axial direction as it is, but the movable wire 12 is configured to be
inserted into the distal end guiding portion 14 in a substantially arc curve shape. Thus, the axial
displacement exerted on the movable wire 12 is converted in a direction substantially orthogonal
to the axial direction so as to follow the hollow shape inside the distal end guide portion 14.
[0007]
Thus, in the conventional magnetostrictive element 26, the axial displacement caused by the
magnetostrictive material 1 can be converted to displacement in the direction substantially
orthogonal to the axial direction through the movable wire 12 . Therefore, since the
magnetostrictive element 26 can be disposed substantially in parallel to the driven object to
which the displacement is to be transmitted, the overall height of the device including the driven
object can be reduced.
[0008]
And since the magnetostrictive element 26 comprised in this way can be applied to the flat type
acoustic device provided with the diaphragm, the structure and effect | action are demonstrated
using FIG. 8 below. FIG. 8 shows a cross-sectional view of a flat acoustic device to which a
conventional magnetostrictive element is applied.
[0009]
The flat acoustic device 27 includes a magnetostrictive element 26, a device housing 15, a
04-05-2019
3
diaphragm 16, and an adhesive member 17 for supporting and fixing the peripheral edge of the
diaphragm 16 to the device housing 15. Here, the housing 10 of the magnetostrictive element 26
is strongly fixed to the apparatus housing 15, and the tip of the movable wire 12 is in contact
with the diaphragm 16 and strongly fixed.
[0010]
In such a configuration, when the magnetostrictive element 26 is driven by an acoustic signal,
the acoustic vibration generated in the axial direction of the magnetostrictive material 1 is
converted in the direction perpendicular to the axial direction according to the principle as
described above. Then, the vibration is transmitted to the diaphragm 16 through the movable
wire 12, whereby the acoustic wave is emitted from the flexural vibration of the diaphragm 16,
and the function as an acoustic device can be exhibited.
[0011]
JP, 2005-176126, A (page 10, FIG. 2)
[0012]
However, in the magnetostrictive element 26 as described above, the tip guiding portion 14 is
indispensable also in order to maintain the substantially arc-curved shape of the movable wire 12
favorably and maintain the displacing direction of conversion. Was a problem that
In addition, the structure in which the movable wire 12 is inserted into the inside of the distal
end lead portion 14 also leads to complication of the manufacturing process for the
magnetostrictive element which has an advantage of being a relatively simple structure. .
[0013]
Furthermore, in the magnetostrictive element 26, the displacement force in the axial direction is
effectively canceled by the movable wire 12 inserted into the inside of the distal end guiding
portion 14 because the displacement in the axial direction is forcibly converted into substantially
orthogonal direction. It is impossible to avoid contact between the hollow inner surface of the
04-05-2019
4
leading end guide 14 and the movable wire 12 at each displacement. As a result, there is a
problem that the durability of the magnetostrictive element 26 and the entire planar acoustic
device 27 including the same is deteriorated by the decrease in conversion efficiency and the
wear of members due to the contact friction. There was also.
[0014]
Therefore, in the present invention, it is an object of the present invention to solve the problems
as described above and to provide a magnetostrictive element having improved conversion
efficiency and durability and a flat acoustic device including the magnetostrictive element.
[0015]
In order to achieve the above object, the magnetostrictive element of the present invention and a
planar acoustic device provided with the same employ the following configuration.
[0016]
In the magnetostrictive element according to the present invention, axial displacement of the
magnetostrictive material is made in a direction substantially orthogonal to the axial direction by
energizing the bar-like magnetostrictive material, the conductive coil around the periphery of the
magnetostrictive material, and the conductive coil. A displacement direction conversion member
to be converted, and first and second movable tip portions which operate in accordance with the
axial displacement of the magnetostrictive material by sandwiching both ends of the bar-like
magnetostrictive material are provided, and this displacement direction The conversion member
is an elastic member having a convex shape in which both ends are fixed between the first and
second movable tip portions and the convex direction is on the outer side with respect to the
magnetostrictive material, and the displacement direction is changed It is characterized in that
the axial displacement of the magnetostrictive material at the first and second movable tip
portions can be converted to the direction orthogonal to the axial direction by elastic
deformation of the member.
[0017]
The magnetostrictive element according to the present invention is characterized in that the
sectional shape between both ends of the displacement direction conversion member described
above is a substantially normal distribution curve shape or a composite shape in which a
plurality of substantially normal distribution curves are arranged in series. It is a thing.
[0018]
04-05-2019
5
Furthermore, the magnetostrictive element according to the present invention is characterized in
that the magnetostrictive material or the conductive coil described above is fixedly arranged on a
base.
[0019]
Furthermore, the magnetostrictive element according to the present invention is characterized in
that the magnetostrictive material or the conductive coil is fixed to a base at a substantially
central portion of the magnetostrictive material described above.
[0020]
Furthermore, in the magnetostrictive element of the present invention, both of the displacement
direction conversion members described above are fixed at both ends between the first and
second movable end portions, and are disposed so as to face each other across the
magnetostrictive material. It is characterized in that it comprises first and second elastic
members.
[0021]
Furthermore, the magnetostrictive element according to the present invention is characterized in
that the top of the second displacement direction conversion member described above is fixedly
disposed on a base.
[0022]
In the magnetostrictive element according to the present invention, a displacement direction
conversion member for converting axial displacement of the magnetostrictive material in a
direction substantially orthogonal to the axial direction by energizing a conductive coil wound
around the outer periphery of the magnetostrictive material; The fixed end which fixes one end in
the axial direction in the base to the base, the movable end which abuts on the other end of the
rod-like magnetostrictive material in the axial direction and follows the operation of the
magnetostrictive material in the axial direction And a fixed wall fixed to the base on an axial
extension of the magnetostrictive material at a predetermined distance, and the displacement
direction conversion member has its both ends fixed between the movable tip and the fixed wall
It is characterized in that it is constituted by an elastic member having a convex shape, and the
axial displacement of the magnetostrictive material at the movable tip can be converted in a
direction orthogonal to the axial direction by elastic deformation of the elastic member. is there.
[0023]
04-05-2019
6
The magnetostrictive element according to the present invention is characterized in that the
sectional shape between both ends of the displacement direction conversion member described
above is a substantially normal distribution curve shape or a composite shape in which a
plurality of substantially normal distribution curves are arranged in series. It is
[0024]
A flat acoustic device provided with the magnetostrictive element according to the present
invention has the magnetostrictive element described above and a diaphragm provided in contact
with the top of the displacement direction conversion member constituting the magnetostrictive
material, and the displacement direction is It is characterized in that the displacement of the
conversion member due to the elastic deformation can be transmitted to the diaphragm.
[0025]
In the magnetostrictive element according to the present invention, both ends of the
displacement direction conversion member having a substantially normal distribution curve
shape or a complex shape in which a plurality of substantially normal distribution curves are
arranged in parallel are disposed between the first and second movable tip portions. By adopting
a drive structure in which the displacement of the magnetostrictive member in the axial direction
is converted to the direction orthogonal to that by the elastic deformation of the displacement
direction conversion member, the leading end induction portion in the conventional
magnetostrictive element becomes unnecessary.
Therefore, it is possible to avoid the complication of the member configuration and to realize
simplification in the manufacturing process.
[0026]
Furthermore, in the magnetostrictive element according to the present invention, the
displacement direction conversion member having a substantially normal distribution curve
shape or a plurality of substantially normal distribution curves arranged in parallel is
simultaneously displaced from both ends and elastically deformed. The displacement direction
can be changed while effectively offsetting the axial displacement.
04-05-2019
7
Therefore, the magnetostrictive element and the planar acoustic device do not require a leading
end guiding portion for performing strong displacement direction conversion in the conventional
magnetostrictive element, contact friction and the like do not occur, conversion efficiency is
improved, and durability is improved. It becomes possible to offer.
[0027]
Hereinafter, the configuration and driving mechanism of the magnetostrictive element in the
embodiment of the present invention will be described.
The same parts in the configuration of the present invention will be described using the same
reference numerals as the background art.
[0028]
FIG. 1 is a structural cross-sectional view showing the structure of the magnetostrictive element
of the present invention.
As shown in the cross-sectional view of FIG. 1, the magnetostrictive element 21 in the first
embodiment of the present invention includes a magnetostrictive material 1, a conductive coil 2
wound around the magnetostrictive material 1, and movable end portions provided at both ends
of the magnetostrictive material 1. 3. A support column 4 supporting and fixing an axial center
portion of the magnetostrictive material 1, a base 5, and a displacement direction conversion
member 6a consisting of an elastic member whose both ends are fixed to the two movable tip
portions 3 There is.
Here, the displacement direction conversion member 6a is disposed such that the cross-sectional
shape between both ends has a substantially normal distribution curve shape, and the convex
direction thereof is on the outside with respect to the magnetostrictive material 1.
Further, the displacement direction conversion member 6a has an elasticity that allows the whole
to be elastically deformed according to the displacement drive in the axial direction received
from the movable tip 3 fixed at both ends.
04-05-2019
8
[0029]
In the magnetostrictive element 21 configured as described above, when a current flows in the
conductive coil 2, a magnetic flux is generated to penetrate the inside of the conductive coil 2,
and the magnetostrictive material 1 stretches and deforms in the axial direction according to the
magnetic flux.
Here, since the magnetostrictive material 1 is supported and fixed at its central portion by the
support column 4, both ends thereof are axially displaced due to expansion and contraction so
that the movable tip 3 fixed to both ends also follows it. It is displaced in the axial direction.
[0030]
At this time, the displacement direction conversion member 6a fixed so as to sandwich both ends
in the inside of the movable tip portion 3 receives displacement driving in the same direction
from both ends due to the axial displacement of the movable tip portion 3.
And since the displacement direction conversion member 6a has elasticity, displacement drive
from both end portions is directly transmitted to the central portion, but since its shape is a
substantially normal curve shape, The direction of the displacement drive to be transmitted is
smoothly converted in the direction substantially orthogonal to the axial direction toward the
convex portion in the central portion.
As described above, the displacement drive is transmitted through the inside of the displacement
direction conversion member 6a, and the efficiency with which the direction is converted is the
highest when the cross-sectional shape thereof is approximately a normal curve shape
dynamically, and other shapes A much higher conversion efficiency can be realized as compared
with the displacement direction conversion member 6a in the case of adopting.
[0031]
Thus, in the magnetostrictive element 21, the axial displacement caused by the expansion and
contraction of the magnetostrictive material 1 is converted into displacement in the direction
04-05-2019
9
substantially orthogonal to the axial direction at the convex portion at the center of the
displacement direction conversion member 6a. Will have.
[0032]
In the member configuration of the magnetostrictive element 21 provided with the displacement
direction conversion member 6a having such a substantially normal distribution curve shape,
there is no need to provide the leading end induction portion 14 as in the conventional
magnetostrictive element 26.
Therefore, it is possible to exhibit the function of converting the displacement direction while the
member configuration is extremely simple, and the simplicity of the member configuration can
contribute to the simplification of the manufacturing process.
[0033]
Further, in the magnetostrictive element 21 according to the present invention, the displacement
direction conversion member 6a having a substantially normal distribution curve shape is
simultaneously displaced from its both ends and elastically deformed, so that axial displacement
is effectively achieved. The displacement direction can be changed while offsetting.
Therefore, the forceful displacement direction conversion in the tip guide portion 14 described
above is eliminated, and thus contact friction and the like do not occur, whereby the conversion
efficiency and the durability of the device can be improved.
[0034]
Although an example in which the cross-sectional shape of the displacement direction conversion
member 6a has a substantially normal distribution curve shape is shown as the optimum form in
the present embodiment, the performance is inferior to this shape. The cross-sectional shape of
the conversion member 6a may be a chevron convex shape or another quadratic curve shape.
[0035]
In the present embodiment, the magnetostrictive material 1 is fixed to the base 5 via the support
04-05-2019
10
column 4. However, the conductive coil 2 is fixed to the base 5 via the support column 4. It does
not matter.
[0036]
Next, another structural example of the magnetostrictive element of the present invention will be
described.
FIG. 2 shows a cross-sectional view of the magnetostrictive element in the second embodiment of
the present invention.
[0037]
In this magnetostrictive element 22, the driving method and the principle of converting the
displacement direction are the same as those of the magnetostrictive element 21 in the first
embodiment, but the supporting column 4 (FIG. 1) in the magnetostrictive element 21 is used as
the displacement direction conversion member 6b. The configuration is different only in the
configuration in which the entire element is fixed to the base 5 via the central convex portion of
the displacement direction conversion member 6b.
[0038]
In the magnetostrictive element 22 having such a configuration, the two displacement direction
conversion members 6a and 6b can simultaneously transform the axial displacement of the
magnetostrictive material 1 in the direction orthogonal thereto.
At this time, since the displacement direction conversion member 6b is fixed to the base 5 at its
central convex portion, the displacement amount in the orthogonal direction in the displacement
direction conversion member 6a with respect to the base 5 is the first embodiment. As compared
with the magnetostrictive element 21 in the above, it is possible to approximately double.
[0039]
04-05-2019
11
Moreover, not only that, in the magnetostrictive element 22, the displacement direction
conversion member 6a received when the magnetostrictive material 1 is deformed due to the
structure in which the displacement direction conversion members 6a and 6b are arranged
symmetrically above and below the magnetostrictive material 1. , 6b will be applied
symmetrically from both the upper and lower sides.
Therefore, in the magnetostrictive element 21 (FIG. 1) in the first embodiment, the reaction force
is applied asymmetrically only from the upper displacement direction conversion member 6a, so
that the magnetostrictive material 1 receives stress in the direction orthogonal to the axial
direction. Although there is a possibility that the magnet may be easily broken, in this
magnetostrictive element 22, due to the symmetry of the reaction force from the displacement
direction conversion members 6a and 6b, the stress to which the magnetostrictive material 1 is
subjected in the direction orthogonal to the axial direction is almost completely offset It also
becomes possible to contribute to the improvement of the durability of the material 1.
[0040]
Next, still another configuration example of the magnetostrictive element of the present
invention will be described.
FIG. 3 shows a cross-sectional view of the magnetostrictive element in the third embodiment of
the present invention.
[0041]
In this magnetostrictive element 23, the basic member configuration and drive principle are the
same as the magnetostrictive element 22 of the second embodiment, but the displacement
direction conversion members 6a and 6b of the substantially normal distribution curve shape
shown by the magnetostrictive element 22 The only difference is that, instead of FIG. 2),
displacement direction conversion members 6c and 6d having a composite shape in which two
substantially normal distribution curves are connected in series in the axial direction are used. In
the present embodiment, a configuration example is shown in which two convex portions of the
displacement direction conversion member 6 d disposed below the magnetostrictive material 1
are fixed to the base 5.
04-05-2019
12
[0042]
As described above, the entire magnetostrictive element 23 is fixed to the base 5 by the two
convex portions of the displacement direction conversion member 6 d, whereby the
magnetostrictive element 23 is entirely fixed by only one convex portion. Compared to the
magnetostrictive element 22 (FIG. 2) of the second embodiment, it is possible to obtain the same
effect as the magnetostrictive element 22 while maintaining the fixed strength much stronger.
Further, the magnetostrictive element 23 in the present embodiment stabilizes the parallelism of
the displacement of the magnetostrictive material 1 in the axial direction with the driven member
fixed in contact with the base 5 and the two convex portions of the displacement direction
conversion member 6d. Have the effect of maintaining
[0043]
In the drawing, the cross-sectional shape of the displacement direction conversion members 6c
and 6d shows a configuration example in which two approximately normal distribution curves
are connected in series in the axial direction, but the displacement disposed below the
magnetostrictive material 1 If the cross-sectional shape of the direction conversion member 6d is
a complex shape in which a plurality of substantially normal distribution curves are arranged in
series, the shapes of the displacement direction conversion members 6c and 6d do not
necessarily have to be the same. Therefore, even if, for example, the shape of the displacement
direction conversion member 6c is replaced with the displacement direction conversion member
6a (FIG. 2) of the substantially normal distribution curve shape in the second embodiment,
substantially the same effect can be obtained.
[0044]
Next, still another configuration example of the magnetostrictive element of the present
invention will be described. FIG. 4 shows a cross-sectional view of the magnetostrictive element
in the fourth embodiment of the present invention.
[0045]
The magnetostrictive element 24 includes a magnetostrictive material 1 and a conductive coil 2
wound around it, a fixed tip 8 provided at one end of the magnetostrictive material 1, a movable
04-05-2019
13
tip 3 provided at the other end of the magnetostrictive material 1, A fixed portion 9 disposed
apart from the movable tip 3 on the axial extension of the magnetostrictive material 1, and a
displacement direction in which both ends are fixed so as to be held between the movable tip 3
and the fixed portion 9 It is comprised from the conversion member 6e.
[0046]
The fixed end portion 8 and the fixed portion 9 are fixedly mounted on the base 5 so that the
movable end portion 3 can move in the axial direction of the magnetostrictive material 1
according to the expansion and contraction of the magnetostrictive material 1. There is.
Furthermore, as with the displacement direction conversion members 6a and 6b of the
magnetostrictive elements 21 and 22 in the first and second embodiments, the displacement
direction conversion member 6e has a substantially normal distribution curve in cross section. .
[0047]
In this magnetostrictive element 24, as in the case of the conventional magnetostrictive element
26 (FIG. 7), the expansion / contraction deformation of the magnetostrictive material caused by
the energization of the conductive coil 2 The axial displacement of Here, the fixing portion 9 does
not receive displacement as the fixing tip portion 8 does. Therefore, the displacement direction
conversion member 6 e provided in contact with the movable tip 3 receives the displacement
drive in the axial direction from the movable tip 3 as it is, with the fixed point with the fixed
portion 9 as a fulcrum. Therefore, with the same principle of displacement direction conversion
as described in the first and second embodiments, displacement in the orthogonal direction can
be generated at the central convex portion.
[0048]
Even with the magnetostrictive element 24 having such a configuration, it is possible to exhibit
the conversion function in the displacement direction almost the same as the magnetostrictive
elements 21 to 23 in the first to third embodiments.
[0049]
04-05-2019
14
Next, still another configuration example of the magnetostrictive element of the present
invention will be described.
FIG. 5 is a structural cross-sectional view of a flat acoustic device provided with the
magnetostrictive element 21 according to the first embodiment of the present invention. 6 (a)
and 6 (b) are schematic views showing the operation of this flat acoustic device.
[0050]
The flat acoustic device 25 supports and fixes the peripheries of the magnetostrictive element
21, the device housing 15, the diaphragm 16, and the diaphragm 16 to the device housing 15 as
in the case of the conventional flat acoustic device 27 in FIG. And an adhesive member 17. Here,
the support column 4 of the magnetostrictive element 21 is strongly fixed to the apparatus
housing 15, and the top of the displacement direction conversion member 6a is strongly fixed to
abut on the diaphragm 16.
[0051]
In such a configuration, when the magnetostrictive element 21 is driven by an acoustic signal,
the acoustic vibration in the axial direction of the magnetostrictive material 1 is made in the axial
direction at the top of the displacement direction conversion member 6a according to the drive
principle described in detail in FIG. Converted to vertical acoustic vibration. And since the top
part of this displacement direction conversion member 6a is fixed so as to abut on the diaphragm
16, as shown in FIGS. 6 (a) and 6 (b), the diaphragm 16 is formed by the adhesive member 17.
The flexural vibration corresponding to the expansion and contraction of the magnetostrictive
material 1 is generated with the supported and fixed place as a fulcrum, and the diaphragm 16
can be vibrated by repeating the modes of FIGS. 6 (a) and 6 (b). . As a result, an acoustic wave is
emitted from the flexural vibration of the diaphragm 16, and the function as an acoustic device
can be exhibited.
[0052]
As described above, in the case of the planar acoustic device 25 provided with the
magnetostrictive element 21 according to the present invention, as compared with the
conventional planar acoustic device 27 (FIG. 8) provided with the magnetostrictive element 26,
04-05-2019
15
Not only can a more efficient acoustic effect be exhibited, but also the durability of the acoustic
device can be improved.
[0053]
The planar acoustic device 25 in this embodiment has a configuration example in which the
magnetostrictive element 21 shown in the first embodiment is incorporated in the device, but
instead of this, the magnetostriction in the second to fourth embodiments is taken. The
incorporation of the elements 22-24 likewise acts as a planar acoustic device.
[0054]
It is a structure sectional view showing composition of a magnetostrictive element of the present
invention.
(Example 1) It is a structural sectional view showing the structure of the magnetostrictive
element of the present invention.
(Embodiment 2) FIG. 5 is a cross-sectional view showing the structure of the magnetostrictive
element of the present invention. (Embodiment 3) FIG. 7 is a cross-sectional view showing the
structure of the magnetostrictive element of the present invention. (Embodiment 4) FIG. 5 is a
structural cross-sectional view showing the structure of a flat acoustic device according to the
present invention. (Fifth Embodiment) FIG. 14 is a schematic view showing the vibration mode of
the diaphragm in the flat acoustic device of the present invention. (Example 5) FIG. 15 is a
structural cross sectional view showing the structure of a conventional magnetostrictive element.
It is structure sectional drawing which shows the structure of the conventional planar sound
apparatus.
Explanation of sign
[0055]
Reference Signs List 1 magnetostrictive material 2 conductive coil 3 movable tip 4 support
column 5 base 6a to 6e displacement direction conversion member 8 fixed tip 9 fixed portion 15
device housing 16 diaphragm 17 adhesive member 21 to 24 magnetostrictive element 25 flat
acoustic device
04-05-2019
16
04-05-2019
17
Документ
Категория
Без категории
Просмотров
0
Размер файла
27 Кб
Теги
jp2007194686
1/--страниц
Пожаловаться на содержимое документа