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DESCRIPTION JP2006324893

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DESCRIPTION JP2006324893
PROBLEM TO BE SOLVED: To provide a piezoelectric vibrating element capable of easily
performing electrical connection of piezoelectric elements of a plurality of piezoelectric vibrators
and electrical connection of a diaphragm. SOLUTION: The first clip member 7 electrically
connects four surface electrode layers 27a and 29a included in the first and second piezoelectric
vibrators 5A and 5B to each other to output one output of a power source. The first electrical
connection means connected to the terminal is configured. A second clip member 9 electrically
connects two diaphragms 25 included in the first and second piezoelectric vibrators 5A and 5B
to each other to be connected to the other output terminal of the power supply. The electrical
connection means of [Selected figure] Figure 1
Piezoelectric vibrator
[0001]
The present invention relates to a piezoelectric vibration element used for a piezoelectric sound
generator or the like.
[0002]
A piezoelectric vibrator having a plurality of piezoelectric vibrators is shown in FIG. 5 of
Japanese Unexamined Patent Publication No. 62-290299.
The piezoelectric vibrator supports the plurality of piezoelectric vibrators so that the plurality of
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piezoelectric vibrators can be vibrated such that the plurality of piezoelectric vibrators formed by
bonding the piezoelectric elements to both surfaces of the diaphragm and the piezoelectric
elements of the plurality of piezoelectric vibrators face each other And a support. The
piezoelectric elements of the plurality of piezoelectric vibrators are electrically connected by
soldered lead wires. Further, the diaphragms of the plurality of piezoelectric vibrators are also
electrically connected by lead wires by soldering. JP-A-62-290299 (FIG. 5)
[0003]
However, in such a piezoelectric vibration element, it is necessary to solder and wire the lead
wire, and the manufacturing becomes complicated. Further, since the soldering is performed, the
dimensions in the vibration direction of the plurality of piezoelectric vibrators become large.
Further, when the height dimension of the soldered portion of the piezoelectric element becomes
large, there is a problem that a plurality of piezoelectric vibrators interfere with each other.
[0004]
An object of the present invention is to provide a piezoelectric vibrating element capable of easily
performing the electrical connection of each piezoelectric element of a plurality of piezoelectric
vibrators and the electrical connection of a diaphragm.
[0005]
Another object of the present invention is to provide a piezoelectric vibrating element capable of
reducing the size in the vibration direction of a plurality of piezoelectric vibrators.
[0006]
Another object of the present invention is to provide a piezoelectric vibrator which can prevent a
plurality of piezoelectric vibrators from interfering with each other.
[0007]
The piezoelectric vibrator of the present invention comprises n (where n is an integer of 2 or
more) piezoelectric vibrators, a support, a first electrical connection means, and a second
electrical connection means. There is.
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The n piezoelectric vibrators have a surface electrode layer of the first polarity on the surface
and a back electrode layer of the second polarity on the back surface, and a plurality of electrode
layers and one or more piezoelectric vibration layers alternate. A back electrode layer of the first
piezoelectric element is electrically conductively joined to the surface of the diaphragm; The back
electrode layer of the piezoelectric element is electrically conductively joined to the back surface
of the diaphragm.
The support is such that each second piezoelectric element of the n piezoelectric vibrators and
each first piezoelectric element face each other at a predetermined distance, and the n
piezoelectric vibrators can vibrate. It supports n piezoelectric vibrators.
The first electrical connection means electrically connects the 2n surface electrode layers
included in the n piezoelectric vibrators to each other and is connected to one output terminal of
the power supply. The second electrical connection means electrically connects the n diaphragms
included in the n piezoelectric vibrators to each other and is connected to the other output
terminal of the power supply. The first and second piezoelectric vibrators each have a diaphragm
exposed portion configured by exposing a part of the diaphragm to a portion supported by the
support. In addition, the support has a structure for supporting the end portion or the central
portion of the n piezoelectric vibrators such that the n piezoelectric vibrators can vibrate. The
first electrical connection means has a structure provided with a plurality of conductive contact
pieces in contact with the 2 n surface electrode layers and mounted to n piezoelectric vibrators,
The second electrical connection means has a structure in which the plurality of conductive
contact pieces in contact with the exposed portion of the n piezoelectric vibrators are attached to
the n piezoelectric vibrators. .
[0008]
According to the present invention, since it is not necessary to solder the piezoelectric element as
in the prior art, the dimensions of the plurality of piezoelectric vibrators in the vibration direction
can be reduced. In addition, the plurality of piezoelectric vibrators can be prevented from
interfering with each other. Further, the 2n surface electrode layers are not limited to materials
that can withstand soldering. Therefore, various materials such as metal resin paste or metal foil
can be used.
[0009]
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Each of the first and second electrical connection means preferably comprises first and second
clip members resiliently attached to the piezoelectric vibrator. In this way, the surface electrode
layers included in the piezoelectric vibrator can be electrically connected to each other by the
simple operation of attaching the first clip member to the piezoelectric vibrator, and the second
clip member The diaphragms included in the piezoelectric vibrator can be electrically connected
to each other by a simple operation of attaching the piezoelectric vibrator to the piezoelectric
vibrator. Therefore, mass production of the piezoelectric vibration element becomes easy.
[0010]
In the case where a mounting recess for mounting the first and second clip members to the n
piezoelectric vibrators is formed on the support, it is preferable to fill the mounting recess with
an adhesive. In this way, the mounting of the first and second clip members to the n piezoelectric
vibrators and the support of the n piezoelectric vibrators on the support can be performed easily
and reliably.
[0011]
A piezoelectric vibrator comprising two piezoelectric vibrators comprises first and second
piezoelectric vibrators, a support, first electrical connection means, and second electrical
connection means . The first and second piezoelectric vibrators have a plurality of electrode
layers and one or more piezoelectric vibration layers so as to have a front electrode layer of a
first polarity on the surface and a back electrode layer of a second polarity on the back surface.
And the back electrode layer of the first piezoelectric element is electrically conductively joined
to the surface of the vibration plate, and the first and second piezoelectric elements and the
vibration plate having conductivity are alternately laminated. The back electrode layer of the
second piezoelectric element is electrically conductively joined to the back surface of the
diaphragm. In the support, the second piezoelectric element of the first piezoelectric vibrator and
the first piezoelectric element of the second piezoelectric vibrator face each other at a
predetermined distance, and the first and second piezoelectric vibrators The first and second
piezoelectric vibrators are supported to be able to vibrate. The first electrical connection means
electrically connects the four surface electrode layers included in the first and second
piezoelectric vibrators to each other and is connected to one output terminal of the power
supply. The second electrical connection means electrically connects the two diaphragms
included in the first and second piezoelectric vibrators to each other and is connected to the
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other output terminal of the power supply. The first and second piezoelectric vibrators each have
a diaphragm exposed portion configured by exposing a part of the diaphragm to a portion
supported by the support. Further, the support has a structure for supporting the ends or central
portions of the first and second piezoelectric vibrators so that the first and second piezoelectric
vibrators can vibrate, respectively. The first electrical connection means is inserted between the
pair of holding members sandwiching the first piezoelectric vibrator and the second piezoelectric
vibrator, the first piezoelectric vibrator, and the second piezoelectric vibrator. It comprises a first
clip member provided with a pair of contact pieces and resiliently attached to the first and
second piezoelectric vibrators. The first clip member has conductivity as a whole, and has a
length such that the pair of holding pieces are in contact with the surface electrode layers
respectively located on the outside of the first and second piezoelectric vibrators. The contact
piece of each of the first and second piezoelectric vibrators has a length in contact with the
surface electrode layer respectively located on the inner side of the first and second piezoelectric
vibrators; And a second clip member resiliently attached to the first and second piezoelectric
vibrators, and including a pair of sandwiching pieces sandwiching the second piezoelectric
vibrator therebetween. The second clip member is entirely conductive, and one sandwiching
piece of the pair of sandwiching pieces is in contact with the diaphragm exposed portion of the
surface of the diaphragm of the first piezoelectric vibrator, and the other sandwiching piece Has
a length in contact with the exposed portion of the diaphragm on the back surface of the
diaphragm of the second piezoelectric vibrator.
[0012]
According to this structure, the four surface electrode layers included in the first and second
piezoelectric vibrators can be electrically connected simply by attaching the first clip member to
the first and second piezoelectric vibrators. The two diaphragms included in the first and second
piezoelectric vibrators can be electrically connected only by attaching the second clip member to
the first and second piezoelectric vibrators. It can be connected to each other. Therefore, the
electrical connection of the surface electrode layers included in the first and second piezoelectric
vibrators and the electrical connection of the diaphragm can be performed by the simple
operation of inserting the clip.
[0013]
Furthermore, since it is not necessary to solder the first and second piezoelectric elements as in
the prior art, the size in the vibration direction of the first and second piezoelectric vibrators can
be reduced. Further, the first and second piezoelectric vibrators can be prevented from
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interfering with each other.
[0014]
The support may be configured to have first and second partition walls spaced apart from each
other between the first piezoelectric vibrator and the second piezoelectric vibrator. In this case, a
portion where the first partition portion of the first piezoelectric vibrator and the first partition
portion of the second piezoelectric vibrator is disposed is sandwiched between the pair of
sandwiching pieces of the first clip member, and the first partition portion A pair of contact
pieces of the first clip member is inserted between the second partition portion and the first
piezoelectric vibrator and the second piezoelectric vibrator, and the first piezoelectric vibrator
and the second piezoelectric member are inserted. The portion of the vibrator in which the
second partition wall portion is disposed may be sandwiched between the pair of sandwiching
pieces of the second clip member. In this way, the first and second piezoelectric vibrators can be
firmly supported on the support by the first and second partition walls.
[0015]
When the support is provided with mounting recesses for mounting the first and second clip
members to the first and second piezoelectric vibrators, it is preferable to fill the mounting
recesses with an adhesive. . In this way, the mounting of the first and second clip members to the
first and second piezoelectric vibrators and the support of the first and second piezoelectric
vibrators on the support can be performed easily and reliably.
[0016]
The pair of clamping pieces of the first clip member has a shape projecting in the direction
opposite to each other, and the pair of contact pieces of the first clip member has a shape
projecting in the direction away from each other Preferably, the pair of sandwiching pieces of the
second clip member have shapes projecting in directions opposite to each other. In this way, the
first and second clip members are resiliently attached to the first and second piezoelectric
vibrators, and the two members can be reliably joined.
[0017]
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In this case, when the first clip member is attached to the first and second piezoelectric vibrators,
the first partition portion includes an extension portion that spreads the pair of holding pieces of
the first clip member, The second and third piezoelectric vibrators may each have an extension
portion which pushes out the pair of holding members of the second clip member when the
second clip member is attached to the first and second piezoelectric vibrators. Can be easily
attached to the first and second piezoelectric vibrators.
[0018]
The first and second clip members are preferably formed by processing a single metal plate.
In this way, the first and second clip members can be easily mass-produced.
[0019]
According to the present invention, the surface electrode layers included in the piezoelectric
vibrator can be electrically connected to each other by a simple operation of attaching the first
clip member to the piezoelectric vibrator, and the second clip member The diaphragms included
in the piezoelectric vibrator can be electrically connected to each other by a simple operation of
attaching the piezoelectric vibrator to the piezoelectric vibrator. Therefore, mass production of
the piezoelectric vibration element becomes easy.
[0020]
Furthermore, since it is not necessary to solder the piezoelectric element as in the prior art, the
dimensions of the plurality of piezoelectric vibrators in the vibration direction can be reduced. In
addition, the plurality of piezoelectric vibrators can be prevented from interfering with each
other.
[0021]
Embodiments of the present invention will be described below with reference to the drawings.
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FIG. 1 is a partial perspective view of a piezoelectric generator that constitutes a piezoelectric
vibration element according to a first embodiment of the present invention, and FIG. 2 is a crosssectional view taken along line II-II in FIG. 3 is a partial cross-sectional view along the line III-III
in FIG. 1, and FIG. 4 is a partial cross-sectional view along the line IV-IV in FIG. Note that FIG. 1
shows the first and second piezoelectric vibrators, the support, and the first and second clip
members in an exploded state, and FIGS. 2 to 4 show the first and second piezoelectric vibrators.
The state which combined the piezoelectric vibrator, the support body, and the 1st and 2nd clip
member is shown. Moreover, in each drawing, in order to make an understanding easy, the
thickness dimension of a part is exaggerated and drawn. As shown in each drawing, the
piezoelectric sounding device 1 of this example includes the first and second supports 3 and n
sheets (n is an integer of 2 or more, two in this example) supported by the support 3. The
piezoelectric vibrators 5A and 5B, the first clip member 7 and the second clip member 9 are
provided.
[0022]
The support 3 is made of an insulating material such as polybutylene terephthalate (PBT), and
integrally has a base 11 and a main body 13. The main body portion 13 has a rectangular
parallelepiped contour shape, and has a mounting recess 15 penetrating the inside. The
mounting recess 15 has a first opening 15a and a second opening 15b opposed to the first
opening 15a. Since the first opening 15 a and the second opening 15 b are relatively large, the
main body 13 has the first to fourth wall portions 13 a to 13 d surrounding the mounting recess
15. Become. In the first wall 13a of the main body 13, two vibrator fitting recesses 17A and 17B
communicating with the mounting recess 15 are formed (only 17A is shown in FIG. 1 for the
sake of convenience), In the third wall portion 13c, two vibrator fitting recesses 17C and 17D
communicating with the mounting recess 15 are formed. The vibrator fitting recesses 17A to
17D are elongated toward the first opening 15a, and extend from the first opening 15a to the
second opening 15b. The first piezoelectric vibrator 5A has a first opening in the vibrator fitting
recess 17A formed in the first wall 13a and the vibrator fitting recess 17C formed in the third
wall 13c. It is inserted from the 15a side and fitted. In addition, the second piezoelectric vibrating
body 5B is firstly formed in the vibrating body fitting recess 17B formed in the first wall portion
13a and the vibrating body fitting recess 17D formed in the third wall portion 13c. It is inserted
and fitted from the opening 15a side.
[0023]
The main body portion 13 is formed with first and second partition walls 19 and 21 which
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project into the mounting recess 15. The first partition portion 19 is a plate-shaped partition
main body extending toward the third wall portion 13c from the portion between the vibration
member fitting recess 17A of the first wall portion 13a and the vibration member fitting recess
17B. 19a and an end portion on the side of the second opening 15b of the partition main body
19a, the thickness dimension (dimension in the direction in which the second wall 13b and the
fourth wall 13d face each other) is larger than that of the partition main 19a And an extended
portion 19b. The second partition 21 is a partition main body 21a extending from a portion
between the vibrator fitting recess 17C of the third wall 13c and the vibrator fitting recess 17D
toward the first wall 13a; It has an expanded portion 21b located at the second opening 15b side
end of the partition main body 21a and having a larger thickness dimension than the partition
main body 21a. The second wall 15 b is connected to the expanded portion 21 b of the second
partition 21 so as to form a gap between the second opening 15 b and the expanded portion 19
b of the first partition 19. An elongated reinforcing portion 23 is formed to extend across the
portion 13b and the fourth wall portion 13d.
[0024]
Further, in the fourth wall portion 13d of the main body portion 13, a through hole 3a
communicating the inside of the mounting recess 15 with the outside is formed. In the mounting
recess 15, in the state where the first and second piezoelectric vibrators 5A and 5B and the first
and second clip members 7 and 9 are combined, an adhesive made of, for example, epoxy resin
from the through hole 3a is used. The agent is filled.
[0025]
Each of the first and second piezoelectric vibrators 5A and 5B has a vibrating plate 25, a first
piezoelectric element 27, and a second piezoelectric element 29, as shown in detail in FIG. That
is, in this example, a bimorph type piezoelectric element in which the piezoelectric elements 27
and 29 are respectively bonded to both surfaces of the diaphragm 25 is employed. The
diaphragm 25 has an elongated rectangular plate shape having a front surface 25a and a back
surface 25b, and is formed of a metal plate made of iron-nickel alloy, brass or the like. The first
piezoelectric element 27 has two electrode layers 27a and 27b and a piezoelectric vibration layer
27c so as to have a surface electrode layer 27a of a first polarity on the surface and a back
surface electrode layer 27b of a second polarity on the back surface. Is a laminated piezoelectric
element having a structure in which are alternately laminated. Since the surface electrode layer
27a is not soldered as described later, it is also possible to use various materials which are not
suitable for soldering, such as metal resin paste or metal foil. In the first piezoelectric element 27,
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the back electrode layer 27 b of the first polarity is formed on the surface 25 a of the diaphragm
25 such that the diaphragm exposed portion 25 c is left at one end in the longitudinal direction
of the surface 25 a of the diaphragm 25. It is joined. Similarly to the first piezoelectric element
27, the second piezoelectric element 29 has two surface layers such that it has a surface
electrode layer 29a of the first polarity on its surface and a back surface electrode layer 29b of
the second polarity on its back surface. This is a laminated piezoelectric element having a
structure in which 29 a and 29 b and a piezoelectric vibration layer 29 c are alternately
laminated. Also in the second piezoelectric element 29, the back electrode layer 29 b of the first
polarity is formed on the back surface 25 b of the diaphragm 25 so that the diaphragm exposed
portion 25 d is left at one end of the back surface 25 b of the diaphragm 25 in the longitudinal
direction. It is joined. Then, the first piezoelectric vibrating body 5A is inserted in the end in the
longitudinal direction where the diaphragm exposed portions 25c and 25d of the vibrating plate
25 are positioned from the first opening 15a side, and the vibrating body of the support 3 is
fitted. The fitting recess 17A and the vibrator fitting recess 17C are fitted. Further, in the second
piezoelectric vibrating body 5B as well, the end portion in the longitudinal direction where the
diaphragm exposed portions 25c and 25d of the vibrating plate 25 are positioned is inserted
from the first opening 15a side, The fitting recess 17B and the vibrator fitting recess 17D are
fitted. Further, the spacer 6 is fixed to the first piezoelectric vibrating body 5A and the second
piezoelectric vibrating body 5B and disposed between the first piezoelectric vibrating body 5A
and the second piezoelectric vibrating body 5B. . The spacer 6 is formed of a flexible synthetic
resin such as polyurethane. When current flows between the vibration plate 25 and the first
piezoelectric element 27 and the second piezoelectric element 29, the first and second
piezoelectric vibrators 5A and 5B both generate first and second piezoelectric vibrations. It
vibrates in the thickness direction (arrow A) of the body 5A, 5B.
Thus, in the first and second piezoelectric vibrators 5A and 5B, the second piezoelectric element
29 of the first piezoelectric vibrator 5A and the first piezoelectric element 27 of the second
piezoelectric vibrator 5B are predetermined. The longitudinal ends are supported by the support
3 such that the first and second piezoelectric vibrators 5A and 5B can vibrate with a space
between them. The first and second piezoelectric vibrators 5A and 5B have diaphragm exposed
portions 25c and 25d formed by exposing a part of the diaphragm 25 to a portion supported by
the support 3.
[0026]
As shown in FIG. 1, the first clip member 7 is formed by processing one metal plate made of
phosphor bronze, and is formed of a pair of sandwiching pieces 31 and 33, a first connecting
portion 35 and a pair of It has contact pieces 37 and 39 and a second connecting portion 41. The
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pair of holding pieces 31 and 33 both have a rectangular shape and are opposed to each other at
an interval. The pair of sandwiching pieces 31 and 33 has two projections 31 a and 33 a at the
ends, which protrude in the direction to face each other. The first connecting portion 35 has a
substantially U-shaped arc in cross section, and connects the pair of holding pieces 31 and 33.
Each of the pair of contact pieces 37 and 39 has a rectangular shape and faces each other in
contact with each other. The pair of contact pieces 37 and 39 are disposed adjacent to the virtual
surface at an intermediate position between the pair of sandwiching pieces 31 and 33, assuming
a virtual surface parallel to the pair of sandwiching pieces 31 and 33. There is. The pair of
contact pieces 37, 39 has a shape curved at a direction away from each other at the end. Then, at
these end portions, two projections 37a and 39a which protrude in the direction away from each
other are formed. The second connecting portion 41 has a substantially rectangular annular
cross section, and is connected to the first connecting portion 35. The second coupling portion
41 couples the pair of contact pieces 37 and 39.
[0027]
Similarly to the first clip member 7, the second clip member 9 is also formed by processing one
metal plate made of phosphor bronze and has a pair of sandwiching pieces 43 and 45 and a
connecting portion 47. There is. The pair of sandwiching pieces 43 and 45 have a rectangular
shape and are opposed to each other at an interval. The pair of sandwiching pieces 43 and 45
respectively have shapes curved in directions opposite to each other. Further, two protruding
portions 43 a and 45 a that protrude in the direction facing each other are formed at these end
portions. The connecting portion 47 has a substantially U-shaped cross section and has a pair of
holding pieces 43 and 45 connected to each other.
[0028]
The first clip member 7 and the second clip member 9 are inserted from the second opening 15b
of the support 3 and resiliently attached to the first and second piezoelectric vibrators 5A and
5B. Be done. Specifically, as shown in FIGS. 1 and 2, the pair of sandwiching pieces 31 and 33 of
the first clip member 7 is between the first wall portion 13 a of the second opening 15 b and the
reinforcing portion 23. After being expanded by the expansion portion 19b, the first partition
portion 19 of the first piezoelectric vibrating body 5A and the second piezoelectric vibrating
body 5B sandwiches the portion disposed between the first piezoelectric vibrating body 5A and
the second piezoelectric vibrating body 5B. As a result, the protrusions 31a and 33a of the pair
of sandwiching pieces 31 and 33 contact the surface electrode layers 27a and 29a located
outside the first and second piezoelectric vibrating members 5A and 5B, respectively. That is, the
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surface electrode layer 27a of the first piezoelectric element 27 of the first piezoelectric vibrator
5A is in contact with the surface electrode layer 29a of the second piezoelectric element 29 of
the second piezoelectric vibrator 5B. Further, as shown in FIGS. 1 and 3, the pair of contact
pieces 37, 39 of the first clip member 7 is between the first partition 19 and the reinforcement
23 adjacent to the second partition 21. From the first piezoelectric vibrator 5A to the second
piezoelectric vibrator 5B. As a result, the protrusions 37a and 39a of the pair of contact pieces
37 and 39 come into contact with the surface electrode layers 29a and 27a positioned inside the
first and second piezoelectric vibrators 5A and 5B, respectively. That is, the surface electrode
layer 29a of the second piezoelectric element 29 of the first piezoelectric vibrator 5A is in
contact with the surface electrode layer 27a of the first piezoelectric element 27 of the second
piezoelectric vibrator 5B. As described above, the 2n sheets (four sheets in this example) of the
surface electrode layers 27a and 29a included in the first and second piezoelectric vibrators 5A
and 5B are electrically connected to each other by the first clip member 7. A first electrical
connection means connected to one of the output terminals of the power supply.
[0029]
Further, as shown in FIGS. 1 and 4, the pair of sandwiching pieces 43 and 45 of the second clip
member 9 is a region between the reinforcing portion 23 of the second opening 15 b and the
third wall 13 c. When it is inserted, the first piezoelectric vibrating body 5A and the second
partition portion 21 of the second piezoelectric vibrating body 5B sandwich the portion disposed
between the first piezoelectric vibrating body 5A and the second piezoelectric vibrating body 5B.
Thereby, one sandwiching piece 43 of the pair of sandwiching pieces 43 and 45 contacts the
diaphragm exposed portion 25c of the surface 25a of the diaphragm 25 of the first piezoelectric
vibrating body 5A, and the other sandwiching piece 45 is the second It contacts the diaphragm
exposed portion 25d of the back surface 25b of the diaphragm 25 of the piezoelectric vibrator
5B. As described above, the n clip plates (two in this example) included in the first and second
piezoelectric vibrators 5A and 5B are electrically connected to each other by the second clip
member 9 to electrically A second electrical connection means is configured to be connected to
the other output terminal of
[0030]
According to the piezoelectric sounding device 1 of the present embodiment, the first and second
piezoelectric vibrators 5A and 5B can be simply operated by attaching the first clip member 7 to
the first and second piezoelectric vibrators 5A and 5B. The first and second electrode members
27a and 29a can be electrically connected to each other, and the first clip member 9 is attached
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to the first and second piezoelectric vibrators 5A and 5B. The diaphragms 25 included in the
second piezoelectric vibrators 5A and 5B can be electrically connected to each other. Therefore,
mass production of the piezoelectric sound generator 1 is facilitated.
[0031]
Furthermore, since it is not necessary to solder the piezoelectric elements 27 and 29 as in the
prior art, the size of the vibration direction (arrow A) of the first and second piezoelectric
vibrators 5A and 5B can be reduced. Moreover, it can prevent that 1st and 2nd piezoelectric
vibrating body 5A, 5B mutually interferes.
[0032]
FIG. 5 is a perspective view of a piezoelectric speaker that constitutes a piezoelectric vibration
element according to a second embodiment of the present invention. In the piezoelectric
vibration element of this example, the central portions in the longitudinal direction of the first
and second piezoelectric vibrators 105A and 105B are supported by the support 103.
[0033]
In this example, the mounting recess 115 of the support 103 has the first opening 115 a and the
second opening 115 b facing each other, and the first opening 115 a and the second opening
115 b facing each other. And a third opening 115 c that opens in a direction perpendicular to the
direction. Since the third opening 115 c is relatively large and the first opening 115 a and the
second opening 115 b are elongated and small and small, the support 103 surrounds the
mounting recess 115. The first to fifth wall portions 113a to 113e are provided. The first wall
113a, the third wall 113c, and the fifth wall 113e have a plurality of openings that are open to
the first opening 115a and the second opening 115b and communicate with the mounting recess
115. A vibrator fitting recess is formed (in FIG. 5, for convenience, only the vibrator fitting
recesses 117A and 117B formed in the third wall portion 113c are denoted by reference
numerals). The first and second piezoelectric vibrators 105A and 105B are inserted into and
fitted to the plurality of vibrator fitting recesses from the side of the first opening 115a or the
second opening 115b.
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[0034]
Further, in the support body 103, first and second partition wall portions 119 and 121
protruding in the mounting concave portion 115 and a reinforcing portion 123 are formed. The
first and second partition portions 119 and 121 and the reinforcing portion 123 have the same
structure as the first and second partition portions 19 and 21 and the reinforcing portion 23 of
the first embodiment shown in FIG. There is. Further, the reinforcing portion 123 is formed with
a through hole through which the first and second piezoelectric vibrating members 105A and
105B pass.
[0035]
In this example, the first and second piezoelectric vibrating members 105A and 105B are
diaphragm exposed portions 125c and 125d configured such that a portion of the diaphragm
125 is exposed at the central portion in the longitudinal direction supported by the support 103.
have. Then, the first and second piezoelectric vibrators 105A and 105B are inserted from the
side of the first opening 115a or the second opening 115b and fitted in the plurality of vibrator
fitting recesses 117A and 117B and the like. Thus, the central portion in the longitudinal
direction is supported by the support 103. Accordingly, when current flows between the
vibration plate 125 and the first piezoelectric element 127 and the second piezoelectric element
129, the first and second piezoelectric vibrating members 105A and 105B both sides of the
support 103. In the thickness direction (arrows A1 and A2) of the first and second piezoelectric
vibrators 105A and 105B.
[0036]
The first clip member 107 and the second clip member 109 have the same structure as that of
the piezoelectric vibrator of the first embodiment shown in FIG. Also in this example, the first clip
member 107 and the second clip member 109 are inserted from the third opening 115 c of the
support 103 and attached to the first and second piezoelectric vibrators 105 A and 105 B. . For
this reason, the first clip member 107 electrically connects the four surface electrode layers
(127a and 129a) included in the first and second piezoelectric vibrating members 105A and
105B to each other to provide one of the power supplies. The first electric connection means
connected to the output terminal is constituted, and the two diaphragms 125 included in the first
and second piezoelectric vibrators 105A and 105B are electrically connected by the second clip
member 109. A second electrical connection means is configured to be connected to each other
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and to the other output terminal of the power supply.
[0037]
FIG. 6 is a perspective view of the support 203 of the piezoelectric speaker and the first and
second clip members 207 and 209 constituting the piezoelectric vibrator according to the third
embodiment of the present invention. The support 203 of the piezoelectric speaker of this
embodiment can support three piezoelectric vibrators. The support 203 is provided with first to
fifth partition portions 219, 221, 222, 224, and 226 which protrude into the mounting recess
215. The first partition part 219 has a plate-like partition main body 219a and an extension part
219b which extend from the first wall part 213a toward the reinforcing part 223 side. The
second partition 221 has a partition main body 221 a and an extension 221 b which extend from
the reinforcing part 223 toward the first wall 213 a and are spaced apart from the first partition
219. There is. The third partition wall portion 222 includes a plate-shaped partition wall main
body 222a extending from the first wall portion 213a toward the reinforcing portion 223 and an
expansion portion 222b. The third partition portion 222 is disposed side by side with the first
partition portion 219, and extends to a position corresponding to an end of the second partition
portion 221. The fourth and fifth partition wall portions 224 and 226 extend in parallel over the
reinforcing portion 223 and the third wall portion 213c. The fourth partition portion 224 is
disposed at a position corresponding to the first and second partition portions 219 and 221, and
the fifth partition portion 226 is disposed at a position corresponding to the third partition
portion 222. ing. The fourth partition wall portion 224 has a partition wall body 224a and an
expansion portion 224b. The fifth partition wall 226 includes a partition body 226a and an
extension 226b.
[0038]
The first clip member 207 is formed by processing a single metal plate, and the pair of
sandwiching pieces 231 and 233, the first pair of contact pieces 237 and 239, and the second
pair of contact pieces 238, And 240. FIG. The pair of holding pieces 231 and 233 both have a
rectangular shape and are opposed to each other at an interval. The pair of sandwiching pieces
231 and 233 has two protruding portions 231 a and 233 a (only 231 a is shown) protruding in
the direction to face each other. Each of the pair of contact pieces 237, 239 has a rectangular
shape and faces each other in contact with each other. Assuming that the first pair of contact
pieces 237 and 239 is a virtual plane parallel to the pair of sandwiching pieces 231 and 233 at a
position from the sandwiching piece 231 between the pair of sandwiching pieces 231 and 233, It
is arranged to be adjacent. The first pair of contact pieces 237, 239 have a shape that curves in
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the direction away from each other. Further, two protruding portions 237a and 239a protruding
in the directions away from each other are formed at these end portions. Each of the pair of
contact pieces 238 and 240 has a rectangular shape and faces each other in contact with each
other. The second pair of contact pieces 238, 240 is parallel to the pair of sandwiching pieces
231, 233 and the first pair of contact pieces 237, 239 at a position from the sandwiching piece
233 between the pair of sandwiching pieces 231, 233. When a virtual plane is assumed, it is
disposed adjacent to the virtual plane. The second pair of contact pieces 238, 240 have at their
ends a shape that curves away from one another. Further, at these end portions, two protrusions
238 a and 240 a protruding in the direction away from each other are formed.
[0039]
The second clip member 209 is formed by processing a single metal plate, and includes a first
pair of sandwiching pieces 243 and 245 and a second pair of sandwiching pieces 244 and 246.
The first pair of sandwiching pieces 243 and 245 have a rectangular shape and are opposed to
each other at an interval. The first pair of sandwiching pieces 243 and 245 respectively have
shapes curved in directions opposite to each other. Further, two protruding portions 243 a and
245 a that protrude in the direction facing each other are formed at these end portions. The
second pair of sandwiching pieces 244, 246 have a rectangular shape and are opposed to each
other at an interval. One holding piece 244 of the second pair of holding pieces 244, 246 is
substantially in the same position as the first pair of holding pieces 243, 245 in a position from
the holding piece 245 between the first pair of holding pieces 243, 245. Assuming parallel
virtual planes, they are arranged adjacent to the virtual planes. The other sandwiching piece 246
of the second pair of sandwiching pieces 244 and 246 is formed continuously with the
sandwiching piece 245 of the first pair of sandwiching pieces 243 and 245. The second pair of
sandwiching pieces 244 and 246 respectively have shapes curved in directions opposite to each
other. Further, two protruding portions 244 a and 246 a that protrude in the direction facing
each other are formed at these end portions.
[0040]
The first clip member 207 and the second clip member 209 are inserted from the second
opening 215 b of the support 203 and resiliently attached to first to third piezoelectric vibrators
(not shown). Ru. Specifically, when the pair of holding pieces 231, 233 of the first clip member
207 is inserted from the region between the first wall portion 213a of the second opening 215b
and the reinforcing portion 223, the first The protrusions 231a and 233a of the pair of
sandwiching pieces 231 and 233 are the first and third piezoelectric vibrators after being spread
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by the expanded portion 219b of the partition portion 219 and the expanded portion 222b of
the third partition portion 222. Contact the surface electrode layers respectively located on the
outside of the In addition, the first pair of contact pieces 237 and 239 of the first clip member
207 are the first piezoelectric vibrator and the second piezoelectric vibration from between the
first partition 219 and the second partition 221. It is inserted between the body. As a result, the
protrusions 237a and 239a of the pair of contact pieces 237 and 239 come into contact with the
surface electrode layers positioned on the inner side of the first and second piezoelectric
vibrators, respectively. In addition, the second pair of contact pieces 238 and 240 of the first clip
member 207 is between the second piezoelectric vibrator and the third piezoelectric vibrator
from between the third partition 222 and the reinforcement 223. Inserted into As a result, the
protrusions 238a and 240a of the second pair of contact pieces 238 and 240 come into contact
with the surface electrode layers positioned on the inner side of the first and second piezoelectric
vibrators, respectively. In this manner, the first clip member 207 electrically connects the 2 n (six
in this example) surface electrode layers included in the first to third piezoelectric vibrators to
each other to thereby connect one of the power supplies. A first electrical connection means
connected to the output terminal is configured.
[0041]
Further, the first pair of holding pieces 243, 245 of the second clip member 209 is inserted from
the region between the reinforcing portion 223 of the second opening 215b and the third wall
portion 213c, The first to third piezoelectric vibrators are resiliently attached to the first to third
piezoelectric vibrators. Specifically, after the first pair of holding pieces 243 and 245 of the
second clip member 209 are pushed and spread by the expanded portion 224 b of the fourth
partition portion 224 and the expanded portion 226 b of the fifth partition portion 226 , One
sandwiching piece 243 of the pair of sandwiching pieces 243, 245 comes into contact with the
diaphragm exposed portion of the surface of the diaphragm of the first piezoelectric oscillator,
and the other sandwiching piece 245 becomes the diaphragm of the third piezoelectric oscillator
Contacts the exposed part of the diaphragm on the back of the. In addition, after the second pair
of holding pieces 244 and 246 of the second clip member 209 is pushed and spread by the
expanded portion 226 b of the fifth partition portion 226, one holding piece 244 of the pair of
holding pieces 244 and 246 is Is in contact with the diaphragm exposed portion of the surface of
the diaphragm of the second piezoelectric vibrator, and the other sandwiching piece 246 is in
contact with the diaphragm exposed portion of the back surface of the diaphragm of the third
piezoelectric vibrator. As described above, the second clip member 209 electrically connects the
n (three in this example) diaphragms included in the first to third piezoelectric vibrators to each
other to output the other output of the power supply. A second electrical connection means
connected to the terminals is configured.
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[0042]
In the above embodiments, the first and second piezoelectric elements 27 and 29 have two
electrode layers 27a and 27b and one piezoelectric vibrating layer 27c, but three or more
electrode layers Of course, the present invention can also be applied to a piezoelectric vibration
element provided with a piezoelectric element having two or more piezoelectric vibration layers.
[0043]
In each of the above-described embodiments, an example of the piezoelectric vibrator having two
and three piezoelectric vibrators has been described, but the present invention can be applied to
a piezoelectric vibrator having four or more piezoelectric vibrators. Of course.
In that case, one metal plate may be processed to make the first clip member and the second clip
member so as to increase the number of sandwiching pieces and contact pieces joined to each
piezoelectric vibration element.
[0044]
One of the first and second piezoelectric vibrators, the support, and the first and second clip
members of a piezoelectric speaker that constitutes the piezoelectric vibrator according to the
first embodiment of the present invention in a disassembled state FIG. It is sectional drawing in
the II-II line of FIG. 1 in the state which combined the 1st and 2nd piezoelectric vibrator, the
support body, and the 1st and 2nd clip member. It is a partial cross section in the III-III line of
FIG. 1 in the state which combined the 1st and 2nd piezoelectric vibrator, a support body, and a
1st and 2nd clip member. It is a partial cross section figure of the IV-IV line of FIG. 1 in the state
which combined the 1st and 2nd piezoelectric vibrator, a support body, and a 1st and 2nd clip
member. It is a perspective view of the piezoelectric sound generator which comprises the
piezoelectric-type vibration element of the 2nd Embodiment of this invention. It is a perspective
view of the support body and the 1st and 2nd clip member of the piezo-electric sounding
machine which constitutes the piezoelectric vibration element of a 3rd embodiment of the
present invention.
Explanation of sign
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[0045]
DESCRIPTION OF SYMBOLS 1 piezoelectric sound generator 3 support body 5A, 5B 1st and 2nd
piezoelectric vibrator 7 1st clip member 9 2nd clip member 15 mounting recessed part 17A-17D
vibrating body fitting recessed part 19 1st partition part 21 Second partition 25 diaphragm 27
first piezoelectric element 29 second piezoelectric element
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