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DESCRIPTION JPH08316543

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DESCRIPTION JPH08316543
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
piezoelectric transformer used when constructing an inverter for backlight of a liquid crystal
display.
[0002]
2. Description of the Related Art A piezoelectric transformer converts input electrical energy into
mechanical energy by the piezoelectric effect, and converts the mechanical energy into electrical
energy using the piezoelectric effect again to obtain a boosted high voltage. In view of the
relationship between the vibration direction and the polarization direction of the piezoelectric
body, those utilizing the longitudinal effect and the transverse effect have been proposed. Among
them, there is a piezoelectric transformer (hereinafter referred to as a first conventional example)
configured as shown in FIG. 6 as one utilizing the transverse effect, and this piezoelectric
transformer is made of PZT (lead zirconate titanate) or the like. On the main surface of the half of
one side (left side in the figure) along the longitudinal direction of the rectangular flat
piezoelectric ceramic element 1 manufactured using The primary side electrode 2 is formed,
while the output secondary side electrode 3 is formed along the width direction on the side
surface of the other half (right side in the figure). ing. Each half of the piezoelectric ceramic
element 1 is subjected to polarization processing along a desired direction after using the
primary and secondary electrodes 2 and 3.
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[0003]
The piezoelectric transformer at this time is generally mounted in the state as shown in FIG. 7,
and a voltage matching the resonance frequency of the piezoelectric ceramic element 1 through
the lead wire 4 on the input side is used as the primary side electrode When the voltage is
applied to 2, mechanical vibration is generated by the piezoelectric effect, and a high voltage is
generated by the piezoelectric effect accompanying the mechanical vibration, so the generated
high voltage is output from the secondary side electrode 3 Will be taken out through the lead
wire 5 of FIG. In FIG. 7, reference numeral 6 denotes a mounting substrate, 7 denotes a support
member, 8 and 9 denote lands on the input side and output side formed on the surface of the
mounting substrate 6, and lands 8 on the input side. The lead wire 4 on the input side is
connected by soldering, while the lead wire 5 on the output side is connected by soldering to the
land 9 on the output side. That is, since this piezoelectric transformer has two vibration nodes,
so-called node points 10 for minimizing the displacement shown by the broken line in the lower
position in FIG. The position corresponding to the node point 10 which does not have the
possibility of disturbing the vibration of the element 1 is supported by the supporting member 7
of the required cross-sectional shape made of epoxy resin or the like.
[0004]
Further, as another piezoelectric transformer (hereinafter referred to as a second conventional
example), there is one such as shown in FIG. 8 showing an appearance perspective view on the
upper surface side and showing a mounting structure in FIG. On the main surfaces of one side
and the other side half along the longitudinal direction of the piezoelectric ceramic element 1 to
be formed, the input primary side electrodes 2 opposed along the thickness direction are formed.
An output secondary side electrode 3 is formed at a position sandwiched between the primary
side electrodes 2 on the main surface on one side (the upper side in the figure). Further, in this
piezoelectric transformer, as shown by the broken line in FIG. 9, there are three node points 10,
and therefore each position corresponding to these node points 10 is a support member 7 made
of epoxy resin or the like. Support is being carried out. In FIGS. 8 and 9, parts and components
common to those in FIGS. 6 and 7 are denoted by the same reference numerals.
[0005]
By the way, the piezoelectric transformer performs voltage conversion by utilizing mechanical
vibration, and the piezoelectric ceramic element 1 repeats mechanical vibration. In order to
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support the device, the piezoelectric ceramic element 1 is separated from the surface of the
mounting substrate 6 by supporting the support member 7 at each position corresponding to the
node point 10 with the support member 7. However, if such a configuration is adopted, the
piezoelectric transformer can not be mounted directly on the surface of the mounting substrate
6, and the support member 7 must be prepared and then attached. At the same time,
inconveniences such as the need for troublesome work may occur.
[0006]
The present invention has been made in view of such problems, and it is possible to directly
mount on a mounting substrate, and to reduce the time required for mounting. It is intended to
be provided.
[0007]
In order to achieve the above object, the piezoelectric transformer according to the present
invention is provided with a projection projecting toward the mounting substrate at each position
corresponding to the node point of the piezoelectric ceramic element. It is characterized by
In addition, the protrusion part in this case may be integrally formed with the piezoelectric
ceramic element. In addition to mounting electrodes formed on each of the protrusions, it is also
possible to solder each mounting electrode to a connection electrode on the mounting substrate.
[0008]
According to the above configuration, the projection comes in contact with the surface of the
mounting substrate, and the piezoelectric transformer is supported by the projection. As a result,
a separate supporting member is used. There is no need to support it, and the time required for
implementation can be reduced.
[0009]
Embodiments of the present invention will be described below with reference to the drawings.
[0010]
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First Embodiment FIG. 1 is an external perspective view showing the configuration of a
piezoelectric transformer according to a first embodiment of the present invention, FIG. 2 is a
mounting structure diagram showing its mounting state in a simplified manner, and FIG. FIG. 1
(a) is an external perspective view of the upper surface side showing a state in which the
piezoelectric transformer is viewed from the upper side, and FIG. 1 (b) is a mounting structural
view showing an enlarged main part shown by A-A. It is an external appearance perspective view
of the bottom side which shows the state which looked at the piezoelectric transformer from
lower side.
In FIGS. 1 to 3, parts and parts identical or corresponding to those in FIGS. 6 to 9 showing the
conventional example are given the same reference numerals, and detailed description thereof
will be omitted.
[0011]
The piezoelectric transformer according to this embodiment is a so-called single plate lateral
effect type similar to that of the first prior art, and is provided with a rectangular plate-like
piezoelectric ceramic element 1 manufactured using PZT or the like, and this piezoelectric
ceramic The element 1 is configured to be supported by two node points 10 (see FIG. 8).
Then, a projection having a rectangular cross-sectional shape protruding toward the mounting
substrate 6 side at each position corresponding to the node point 10 on the one side main
surface of the piezoelectric ceramic element 1, that is, the bottom surface located on the
mounting substrate 6 side. 11 are integrally formed, and these protrusions 11 are provided along
the width direction of the piezoelectric ceramic element 1.
[0012]
Therefore, as described later, when the piezoelectric transformer configured by including the
piezoelectric ceramic element 1 provided with the projections 11 on the bottom surface is
mounted on the mounting substrate 6, the surface of the mounting substrate 6 is The protrusion
11 abuts, and the piezoelectric transformer is directly mounted on the mounting substrate 6
through the protrusion 11. That is, in the piezoelectric transformer according to this
embodiment, it is not necessary to perform mounting after providing the supporting member 7
as a separate member as in the conventional example, and it is not necessary to prepare the
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supporting member 7. Each of the protrusions 11 is not necessarily integral with the
piezoelectric ceramic element 1 and may be attached by, for example, adhesion after being
manufactured separately.
[0013]
In addition, on the main surface of the half of one side (left side in the drawing) along the
longitudinal direction of the piezoelectric ceramic element 1 constituting the piezoelectric
transformer, the input primary side electrode 2 opposed along the thickness direction is On the
other side (right side in the figure) of the other side (the right side in the figure), the secondary
side electrode 3 for output facing along the width direction is formed on the side of the half, The
mounting electrode 12 is formed on the top by a method such as baking or vapor deposition of a
conductive paste. At this time, the primary electrode 2 on the bottom surface of the piezoelectric
ceramic element 1 is formed to be separated from the end surface located on the front side of the
piezoelectric ceramic element 1 as shown in FIG. Each of the primary side electrode 2 and the
secondary side electrode 3 and each of the mounting electrodes 12 are connected to each other
after being associated with each other.
[0014]
That is, the primary electrode 2 formed on the upper surface of the piezoelectric ceramic element
1 is not only the mounting electrode 12 formed on the front side in FIG. 1B, that is, the end face
of the protrusion 11 but also the piezoelectric ceramic element 1 formed on the bottom surface
of the piezoelectric ceramic element 1 including the side surface of the protrusion 11 while being
associated with the mounting electrode 12 having a long shape formed extending to the side
surface of 1 The next side electrode 2 is connected after being associated with the mounting
electrode 13 formed only on the end face of the protrusion 11 located on the near side in FIG.
1A. Further, each of the secondary side electrodes 3 formed on the side surface of the
piezoelectric ceramic element 1 is connected to each of the mounting electrodes 12 formed on
the end surface of the protrusion 11. Therefore, the primary and secondary electrodes 2 and 3
and the mounting electrodes 12 are electrically connected to each other by being connected. The
piezoelectric ceramic element 1 at this time is polarized by using the primary side electrode 2
and the secondary side electrode 3 as in the conventional example.
[0015]
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Furthermore, the piezoelectric transformer according to the first embodiment is mounted on the
mounting substrate 6 as shown in FIGS. 2 and 3 and the mounting electrode 12 formed on the
protrusion 11 of the piezoelectric ceramic element 1 Each is soldered to the lands 8 and 9 on the
input side and the output side which are connection electrodes formed on the surface of the
mounting substrate 6 and then connected separately. Reference numeral 13 in FIG. 3 denotes a
solder connecting the lands 8, 9 and the mounting electrodes 12.
[0016]
Therefore, in the piezoelectric transformer having such a mounting structure, when a voltage
matching the resonance frequency of the piezoelectric ceramic element 1 is applied to the
primary side electrode 2 through the land 8 on the input side and the mounting electrode 12, the
piezoelectric effect is obtained. As a result of which mechanical vibration occurs and a high
voltage is generated due to the piezoelectric effect accompanying the mechanical vibration, the
secondary side electrode 3 passes through the mounting electrode 12 and the land 9 on the
output side. High voltage will be taken out. Then, although the piezoelectric ceramic element 1 in
this case repeats mechanical vibration, the piezoelectric transformer is mounted on the mounting
substrate after the projection 11 of the piezoelectric ceramic element 1 provided at each position
corresponding to the node point 10 6 mounted on the other hand and the portions other than
the node point 10 are in a state of being separated from the surface of the mounting substrate 6,
the vibration of the piezoelectric ceramic element 1 is not hindered.
[0017]
In the present embodiment, on the bottom surface of the piezoelectric ceramic element 1,
support is provided via the protrusions 11 provided at each position corresponding to the node
point 10, and the mounting electrodes 12 are mounted on the end faces of the protrusions 11.
And a mounting structure in which the primary and secondary electrodes 2, 3 and the lands 8, 9
are connected through the mounting electrodes 12 as described above. It is not limited to That is,
the primary and secondary electrodes 2 and 3 of the piezoelectric ceramic element 1 supported
by the protrusion 11 without forming the mounting electrode 12 and the lands 8 and 9 on the
mounting substrate 6 are the same as in the conventional example. It is also possible to connect
with the lead wires 4 and 5 of the present invention, and even in such a configuration, the
essential object of the present invention is to make it unnecessary to use the support member 7
as a separate member. It will be achieved.
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[0018]
Second Embodiment FIG. 4 is an external perspective view showing the configuration of a
piezoelectric transformer according to a second embodiment of the present invention, FIG. 5 is a
mounting structure diagram showing its mounting state in a simplified manner, and FIG. FIG. 4B
is an external appearance perspective view of the bottom side of the piezoelectric transformer as
viewed from below, and FIG. 4B is an external appearance perspective view of the top side of the
transformer as viewed from above. In FIGS. 4 and 5, parts and parts identical or corresponding to
those in FIGS. 1 to 3 showing the first embodiment are assigned the same reference numerals,
and detailed description thereof will be omitted.
[0019]
The piezoelectric transformer according to the second embodiment is a so-called single-plate
third-order Rosen type similar to that of the second prior art, and is disposed on one main
surface of the piezoelectric ceramic element 1 constituting the same, that is, on the mounting
substrate 6 side. Projections 11 having a rectangular cross-sectional shape protruding toward the
mounting substrate 6 are integrally formed on the bottom surface at each position corresponding
to the node point 10 (see FIG. 10). Are provided along the width direction of the piezoelectric
ceramic element 1. In this case, each of the protrusions 11 may be manufactured after being
manufactured separately from the piezoelectric ceramic element 1 and attached.
[0020]
Therefore, as described later, when the piezoelectric transformer configured by including the
piezoelectric ceramic element 1 provided with the projections 11 on the bottom surface is
mounted on the mounting substrate 6, the surface of the mounting substrate 6 is The protrusion
11 abuts, and the piezoelectric transformer is directly mounted on the mounting substrate 6
through the protrusion 11. That is, also in this embodiment, it is not necessary to perform
mounting after providing the supporting member 7 as a separate member. Furthermore, input
primary side electrodes 2 opposed along the thickness direction are formed on the main surfaces
of one side and the other side half along the longitudinal direction of the piezoelectric ceramic
element 1 constituting the piezoelectric transformer. On the other hand, the secondary side
electrode 3 for output is formed on the surface on the mounting substrate 6 side of the
protrusion 11 located at the center of the bottom surface of the piezoelectric ceramic element 1,
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and mounting on the end face of each protrusion 11 An electrode 12 is formed.
[0021]
At this time, each of the primary electrodes 2 on the bottom surface of the piezoelectric ceramic
element 1 is positioned on the front side of the piezoelectric ceramic element 1 as shown in FIG.
4B as in the first embodiment. It is formed as a state of being separated from the end face, and is
connected to each of the mounting electrodes 12 formed only on the end face of the protrusion
11 located on the front side in FIG. 4A. Further, each of the primary side electrodes 2 formed on
the upper surface of the piezoelectric ceramic element 1 is not only the mounting electrode 12
formed on the near side in FIG. The secondary side electrode 3 is connected on the end face of
the protrusion 11 on which the secondary side electrode 3 is formed while being associated with
each of the mounting electrodes 12 having the long shape formed extending to the side surfaces
of the ceramic element 1. It is connected to the mounting electrode 12 formed on
[0022]
Furthermore, the piezoelectric transformer according to the second embodiment is mounted on
the mounting substrate 6 as shown in FIG. 5, and each of the mounting electrodes 12 formed on
the protrusion 11 of the piezoelectric ceramic element 1 is It is soldered to the lands 8 and 9 on
the input side and the output side, which are connection electrodes formed on the surface of the
mounting substrate 6. As a result, the piezoelectric transformer according to the present
embodiment is mounted on the mounting substrate 6 through the projections 11 of the
piezoelectric ceramic element 1 provided at each position corresponding to the node point 10,
and in this case, Since the portion other than the node point 10 is in a state of being separated
from the surface of the mounting substrate 6, there is no possibility that the vibration of the
piezoelectric ceramic element 1 is hindered. Then, as in the case of the first embodiment, also in
the piezoelectric transformer according to the second embodiment, the mounting electrode 12 is
not formed on the end face of each of the protrusions 11, and the mounting substrate is formed
via the protrusions 11 It is possible to connect the primary side and secondary side electrodes 2,
3 of the piezoelectric ceramic element 1 mounted on 6 and the lands 8, 9 with lead wires 4, 5.
[0023]
By the way, the scope of application of the present invention is not limited to the piezoelectric
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transformer according to the first embodiment or the second embodiment, and can be applied to,
for example, a well-known Rosen type, or a laminate of these. Of course it is. Although not shown
in the drawings, it is also possible to construct a piezoelectric transformer in which the outer
periphery is covered with an insulating layer, if necessary, and bonding the protrusion to the
insulating layer of this piezoelectric transformer, etc. Such a piezoelectric transformer is also
included in the scope of the present invention, as it can be provided by hand.
[0024]
As described above, in the piezoelectric transformer according to the present invention, the
projection is provided at each position corresponding to the node point of the piezoelectric
ceramic element, and the projection is made directly through the projection. As a result, it is not
necessary to perform mounting using a supporting member which is a separate member as in the
conventional example, and it is possible to reduce the time and effort required for mounting. In
addition, in the case where the mounting electrode is formed on the projection, there is also an
effect that it is not necessary to perform the connection by the lead wire as in the conventional
example.
[0025]
Brief description of the drawings
[0026]
1 is an external perspective view showing a configuration of a piezoelectric transformer
according to the first embodiment.
[0027]
2 is a mounting structure diagram showing the mounting state in a simplified manner.
[0028]
3 is an enlarged mounting structure diagram showing the main part shown by the arrow AA in
FIG.
[0029]
4 is an external perspective view showing a configuration of a piezoelectric transformer
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according to a second embodiment.
[0030]
5 is a mounting structure diagram schematically showing the mounting state.
[0031]
6 is an external perspective view showing a configuration of a piezoelectric transformer
according to the first conventional example.
[0032]
7 is a mounting structure diagram schematically showing the mounting state.
[0033]
FIG. 8 is an external perspective view showing a configuration of a piezoelectric transformer
according to a second conventional example.
[0034]
9 is a mounting structure diagram showing the mounting state in a simplified manner.
[0035]
Explanation of sign
[0036]
Reference Signs List 1 piezoelectric ceramic element 6 mounting substrate 8 land (connection
electrode) 9 land (connection electrode) 10 node point 11 protrusion 12 mounting electrode
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