TWI389361B - Piezoelectric transformer device - Google Patents

Description

Piezoelectric transformer device

The present invention relates to a piezoelectric transformer device used in, for example, a power supply circuit of an electronic device, and more particularly to a piezoelectric transformer device that uses a plurality of piezoelectric transformers to perform voltage transformation.

Regarding the prior art of such a piezoelectric transformer device, for example, FIG. 3 and FIG. 4 of Japanese Laid-Open Patent Publication No. 2007-165342 disclose that a plurality of piezoelectric transformers are stacked upside down and mounted, and the overall mounting area is reduced. According to this prior art, a plurality of piezoelectric ceramics are stacked in a state of being assembled in respective cases, and are mounted on a substrate in an integrated state. Therefore, according to the prior art, the mounting area of the piezoelectric transformer can be one part in comparison with the structure in which piezoelectric ceramics are arranged in the lateral direction, and this can save space.

The prior art described above is an excellent structure for providing a high-density and high-density piezoelectric transformer device suitable for mounting components, and the technical value thereof is still high. Moreover, the inventors of the present invention have further improved the prior art and focused on repeated research. Specifically, the inventors waited and repeated the following study: the outer casing on the upper side due to the construction of the prior art Since the piezoelectric transformer on the lower side is housed, the size of the upper casing is set longer than that of the lower casing, but the mounting area is slightly enlarged.

One of the objects of the present invention is to further reduce the mounting area or improve the productivity.

The inventors of the present invention have installed the second piezoelectric transformer in the range of the mounting area of the piezoelectric transformer in the lower stage (in the mounting area) in the circuit board in the two piezoelectric transformers that are mounted at least in two stages. The piezoelectric transformers of the future achieve the above objectives.

According to an aspect of the present invention, a piezoelectric transformer device includes: a first piezoelectric transformer mounted on a circuit substrate in a state in which a first piezoelectric body is housed in a first housing; and a second piezoelectric transformer The second piezoelectric body is housed in the second casing, and is mounted on the circuit substrate via the first piezoelectric transformer in a state of being mounted above the first piezoelectric transformer, and the mounting area projected on the circuit substrate is the first The first conductive member and the second conductive member are respectively disposed in the first housing and the second housing within a range of the mounting area of the piezoelectric transformer in the circuit board, and the first conductive member is connected to the lower end portion. The first mounting terminal of the wiring pattern of the circuit board is formed, the upper end portion is formed as a first connection terminal connected to the second piezoelectric transformer, and the second conductive member is a lower end portion serving as a first piezoelectric transformer The connection terminal is connected to the second mounting terminal.

In the piezoelectric transformer device according to an aspect of the present invention, even in a configuration in which a plurality of piezoelectric transformers, for example, two or more, are stacked, the mounting area or the mounting area of the second piezoelectric transformer loaded after the second stage Nor will it be larger than the mounting area or mounting area of the first piezoelectric transformer. That is, the mounting area of the piezoelectric transformer is accommodated in one portion. Therefore, the mounting area of the entire piezoelectric transformer in the piezoelectric transformer device is often minimized, but the mounting of such a high-density piezoelectric transformer is realized.

Preferably, the first and second housings have a defined shape that is common to each other. In this case, since the shape of the casing is common between the plurality of piezoelectric transformers, the mounting area or the mounting area of the second piezoelectric transformer projected on the circuit substrate and the mounting area of the first piezoelectric transformer in the circuit substrate Or overlap each other in a state where the mounting areas are consistent.

Moreover, since the shapes of the casings are common to all the piezoelectric transformers, even in the case of aligning the positions of the casings, even if the sections are overlapped, the mounting area on the circuit board is not more than one part of the casing. Also expanded. This is also the case for the laminated piezoelectric transformer after the third stage.

Further, since it is not necessary to make the casings individual in shape between the plurality of piezoelectric transformers, it is possible to commonize the components, so that the manufacturing cost can be reduced as compared with the case where the casings are individually designed and manufactured.

In the present invention, it is preferable that the electrical connection of the plurality of piezoelectric transformers is performed by the following constitution. That is, the first and second housings each have a projection formed by a side protrusion.

The first piezoelectric transformer has a first conductive member that penetrates the protruding portion of the first casing and extends in the up and down direction. The lower end of the first conductive member is treated as It is formed by the first mounting terminal connected to the wiring pattern of the circuit board. The upper end portion of the first conductive member is bent along the top surface of the protruding portion and formed as a first connection terminal connected to the second piezoelectric transformer.

The second piezoelectric transformer has a second conductive member that penetrates the protruding portion of the second casing and extends in the up and down direction. The lower end portion of the second conductive member is formed to be bent along the bottom surface of the protruding portion and serves as a second mounting terminal connected to the connection terminal of the first piezoelectric transformer. In a state where the second piezoelectric transformer is mounted on the first piezoelectric transformer, the second mounting terminal and the first connecting terminal are joined to each other.

As described above, between the first piezoelectric transformer and the second piezoelectric transformer, the first connection terminal and the second mounting terminal are each bent along the corresponding top surface and bottom surface. Therefore, when the second piezoelectric transformer is mounted on the first piezoelectric transformer, the first connection terminal and the second mounting terminal overlap each other in parallel in the same plane. As a result, the joining operation of the first connection terminal and the second mounting terminal, for example, a soldering operation or a coating operation of a thermosetting conductive paste can be easily performed.

In one aspect of the present invention, the first connection terminal and the second mounting terminal may be disposed by the side surfaces of the first and second housings, and the first connection may be performed. A space for joining work is ensured between the terminal and the second mounting terminal.

According to this, the joining operation of the first connection terminal and the second mounting terminal is easier, and the production efficiency of the piezoelectric transformer device is greatly improved.

Moreover, the first piezoelectric transformer may have a first housing disposed at an upper portion of the first housing and guide the positioning of the second housing to the first housing in a state where the second piezoelectric transformer is mounted. unit.

According to the above aspect, the second piezoelectric transformer is stably placed during the assembly operation of the piezoelectric transformer device, and the bonding workability between the first connection terminal and the second mounting terminal is further improved.

More specifically, the guide portion is formed such that the guide portion protrudes upward from the top surface of the first casing. Further, it is a form in which the protruding portion protrudes at least from the bottom surface of the second casing. According to this, in a state where the second piezoelectric transformer is mounted on the first piezoelectric transformer, the second housing is positioned to the first housing by the projection being guided by the guiding portion.

In this case, when the second piezoelectric transformer is mounted on the first piezoelectric transformer, the guiding portion positions the second casing while chucking the protruding portion. Further, since the guide portion also contacts the protruding portion after the positioning, the second piezoelectric transformer does not shift when the first connection terminal and the second mounting terminal are engaged, and the workability is further improved.

Further, in an aspect of the invention, it is preferable that the protruding portion and the conductive member are respectively disposed at four places in the first and second housings. In the first piezoelectric transformer, the first mounting terminal and the first connecting terminal are respectively connected to the two primary side electrodes of the piezoelectric body at two of the protruding portions formed at the four positions of the first casing. Among the other two of the four protruding portions, one of the first mounting terminals and the first connecting terminal is connected to the secondary side electrode of the piezoelectric body, and the other first mounting terminal and the first one The connection terminal is not connected to the piezoelectric body.

Further, in the second piezoelectric transformer, for two of the protruding portions formed at four places of the second casing, the second mounting terminals are respectively connected to the two primary side electrodes of the piezoelectric body. Among the other two of the four protruding portions, one of the second mounting terminals is not connected to the piezoelectric body, and the other second mounting terminal is connected to the secondary side electrode of the piezoelectric body.

At this time, in the state where the second piezoelectric transformer is mounted on the first piezoelectric transformer, the second piezoelectric transformer is connected to the other second terminal of the secondary side electrode of the piezoelectric body and is directed to the first pressure. The electric transformer is joined to the other first connection terminal that is not connected to the piezoelectric body. Further, with respect to the second piezoelectric transformer, the second mounting terminal that is not connected to the secondary side electrode of the piezoelectric body and the first piezoelectric transformer are connected to one of the secondary side electrodes of the piezoelectric body. A connection terminal is engaged.

According to an aspect of the present invention, in the case where a plurality of piezoelectric transformers are mounted and mounted, how to electrically connect the piezoelectric transformers that are not directly mounted on the circuit board becomes an important point. In the prior art, the piezoelectric transformer of the upper side is formed with an arm-shaped terminal support portion on the side surface of the casing, and a secondary side terminal is disposed at the lower portion thereof, and the secondary side terminal is used. A configuration directly mounted on the circuit substrate is employed. However, in this case, the piezoelectric transformer on the upper side is separated from the structure of the inter-piezoelectric transformer on the lower side, and the piezoelectric transformer is separately mounted on the circuit substrate on the lower side and the upper side, respectively. (man-hours).

In this regard, in a preferred aspect of the present invention, since the shape of the casing is common between the plurality of piezoelectric transformers, it is basically not feasible to directly mount the second piezoelectric transformer on the circuit substrate, so the second pressure is adopted. Electric transformer terminal and A configuration in which the terminals of the first piezoelectric transformer are joined and mounted. Accordingly, since the terminal used for mounting the piezoelectric transformer device on the circuit board is only the terminal of the first piezoelectric transformer, the number of man-hours is reduced. Further, by pre-joining the terminals between the first piezoelectric transformer and the second piezoelectric transformer, the entire piezoelectric transformer device has a strong structure, and the stability during the mounting work can be improved.

Moreover, the first and second housings preferably have indication means for indicating the direction of assembly of each other at a position visually identifiable from the outside.

As described above, in the piezoelectric body, the primary side electrode and the secondary side electrode are required, and after the positions of the primary side electrode and the secondary side electrode are correctly aligned, the two piezoelectric transformers are assembled. However, since the piezoelectric body is configured to be housed in the casing, it is difficult to immediately know from the outside when the assembly operation is performed, in which direction the primary side electrode and the secondary side electrode are located.

Therefore, in a preferred aspect of the invention, an indication means that can be visually confirmed externally is disposed in the housing. When the two piezoelectric transformers are assembled by the indicating means, the assembly direction of the piezoelectric transformers is easily recognized at a glance, and there is no misuse during assembly work, but the production efficiency is improved.

As described above, the piezoelectric transformer device according to the present invention can minimize the mounting area on the circuit board even when a plurality of piezoelectric transformers are used, and it is possible to mount at a higher density. Further, according to the piezoelectric transformer device according to the present invention, workability in assembling a plurality of piezoelectric transformers is improved, and the production efficiency of the piezoelectric transformer device is greatly improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a side view showing the configuration of a piezoelectric transformer device of an embodiment. Further, Fig. 2 is a side view (the side opposite to Fig. 1) showing the configuration of the piezoelectric transformer device.

The piezoelectric transformer device of the present embodiment has a structure in which the piezoelectric transformer 200 of the upper stage is mounted on the piezoelectric transformer 100 of the lower stage. The two piezoelectric transformers 100 and 200 are structurally and electrically connected to each other, and the circuit board (not shown) is mounted in a state in which the piezoelectric transformer 100 of the lower stage is opposed to each other.

[piezoelectric body]

Each of the piezoelectric transformers 100 and 200 of the lower stage and the upper stage has a basic structure in which the piezoelectric ceramic 12 having a long plate shape or a flat plate shape is accommodated in the resin case 14. In order to suppress the overall mounting height, the piezoelectric ceramic 12 is housed in a state where the piezoelectric ceramic 12 is placed flat, and the thickness direction of the piezoelectric ceramic 12 coincides with the vertical direction.

In each of the piezoelectric ceramics 12, the primary side electrode 12a is formed on each of the upper and lower surfaces in the state shown in Figs. 1 and 2 . A secondary side electrode 12b is formed on one end portion of the bottom surface of the piezoelectric ceramic 12 on the side opposite to the primary side electrode 12a. The portion in which the primary side electrode 12a is formed in the piezoelectric ceramic 12 functions as a driving portion, and the portion in which the primary side electrode 12a is not formed functions as a power generating portion.

[case]

In the present embodiment, the piezoelectric transformers 100 and 200 of the lower stage and the upper stage have a casing 14 of a common shape. Each housing 14 is formed with a specific pressure The electric ceramic 12 has a large outer shape, and a concave-shaped housing portion 14c is formed inside. The bottom surface of the casing 14 is an opening, and the receiving portion 14c extends from the opening toward the inside of the casing 14.

The accommodating portion 14c can accommodate the piezoelectric ceramic 12 in a flat position as shown in the drawing, and the accommodating portion 14c has a shape or a volume larger than the piezoelectric ceramic 12. The piezoelectric ceramic 12 is then placed in a state in which the housing 14 is housed, that is, a silicone adhesive or the like, which is not shown. Therefore, the piezoelectric ceramic 12 can freely vibrate inside the casing 14 when driven, and the vibration is absorbed by the binder.

[protrusion]

A block-shaped projecting portion 14a is integrally formed at four places on both sides of the casing 14 in total. These projections 14a each protrude laterally from the side surface of the casing 14 to a certain extent. Further, the protruding portion 14a is also slightly protruded downward from the opening of the bottom surface of the casing 14. Further, in the illustrated example, although the four protruding portions 14a are displayed in the same shape, the shape of each of the protruding portions 14a may be different.

[conductive member]

Conductive members 18, 18, 20, 22 are inserted into the respective protruding portions 14a. Inserting holes 14b for the conductive members 18, 18, 20, and 22 are formed in the respective protruding portions 14a. The insertion holes 14b extend through the inside of each of the protruding portions 14a and extend in the longitudinal direction. Each of the conductive members 18, 18, 20, 22 is, for example, a metal rod, a so-called lead pin. In the illustrated example, the cross-sectional shape is an angular shape, but the conductive members 18, 18, 20, and 22 may have a flat shape and may have a round bar shape. In addition, the shape of the conductive members 18, 18, 20, 22 The piezoelectric transformer 100 in the lower stage is different from the piezoelectric transformer 200 in the upper stage. The following is explained for this point.

[First mounting terminal]

In the piezoelectric transformer 100 of the lower stage, the conductive members 18, 18, 20, and 22 are inserted into the insertion holes 14b of the respective projecting portions 14a while being bent into an inverted L shape. The lower end portions of the conductive members 18, 18, 20, 22 are protruded downward by the respective projecting portions 14a, and these lower end portions are formed as the mounting terminals 18a, 18a, 20a, 22a, respectively. The piezoelectric transformer device is attached to the circuit board (not shown) by, for example, mounting terminals 18a, 18a, 20a, and 22a. Further, the piezoelectric transformer device may be surface-mounted on the circuit board in a state in which the mounting terminals 18a, 18a, 20a, and 22a are bent.

[First connection terminal]

On the other hand, the upper end portions of the conductive members 18, 18, 20, 22 are bent in the horizontal direction along the top surface of the housing 14 at the top surface of each of the protruding portions 14a, along the housing 14 in the illustrated example. Each of the upper ends of the longitudinal direction extends toward both outer sides. These upper end portions are formed as connection terminals 18b, 18b, 20b, and 22b, respectively, and the piezoelectric transformer 200 of the upper stage is connected to the piezoelectric transformer 100 of the lower stage via the connection terminals 18b, 18b, 20b, and 22b.

The difference between the conductive members 18, 18, 20, 22 will be described here.

The conductive members 18, 18 are respectively connected to the primary side electrodes 12a at two places of the piezoelectric ceramic 12. The conductive members 18, 18 are disposed in pairs at the one end of the left side of the casing 14 in Fig. 1 at the positions on the right side of Fig. 2, respectively, in pairs on both sides. In the housing portion 14c of the housing 14 once in each The side electrodes 12a are respectively soldered with conductive wires 16, such as gold wires. These conductive wires 16 and 16 are pulled out to the outside of the casing 14 by the accommodating portions 14c, and are welded in a state of being bundled on the connection terminals 18b and 18b on both sides. Further, the conductive wire 16 may be soldered to the mounting terminal 18a.

Next, the conductive members 20 and 22 are disposed in pairs on the opposite sides of the conductive members 18 and 18 in the longitudinal direction of the casing 14, respectively. The conductive wire 16 is also soldered to the secondary side electrode 12b of the piezoelectric ceramic 12, except that the secondary side electrode 12b is only one place. Therefore, the conductive wire 16 is only soldered to one of the conductive members 20. In the secondary side electrode 12b, the conductive wire 16 is pulled out to the outside of the case 14 by the accommodating portion 14c, and is welded to the connection terminal 20b (see Fig. 2).

The other conductive member 22 is electrically disconnected from the piezoelectric ceramics 12 with respect to the piezoelectric transformer 100 of the lower stage, and is a so-called empty terminal. On the other hand, in the piezoelectric transformer 200 of the upper stage, the conductive member 22 is electrically connected to the secondary side electrode 12b of the piezoelectric ceramic 12. Further, the connection relationship with respect to the conductive member 22 will be further described later.

Next, in the piezoelectric transformer 200 of the upper stage, the respective conductive members 18, 18, 20, and 22 are bent into a substantially C-shape in a state in which the insertion holes 14b of the respective projecting portions 14a are inserted. That is, the conductive members 18, 18, 20, 22 are bent, and the upper end portions of the tantalum conductive members 18, 18, 20, 22 are along the top surface of the housing 14 above the respective projections 14a, and the conductive members 18, 18 The lower end portions of the 20 and 22 are along the bottom surface of the casing 14 below the respective projecting portions 14a. Further, in the illustrated example, each of the upper end portion and the lower end portion extends toward both outer sides viewed in the longitudinal direction of the casing 14.

[Second mounting terminal]

Fig. 3 is a bottom view showing the piezoelectric transformer 200 of the upper stage alone. Moreover, FIG. 4 is a plan view showing the piezoelectric transformer 200 of the upper stage alone. In addition to FIG. 1 and FIG. 2, the following description will be made with reference to FIG. 3 and FIG.

In the piezoelectric transformer 200 of the upper stage, the lower end portions of the respective conductive members 18, 18, 20, 22 are formed as mounting terminals 18c, 18c, 20c, and 22c, respectively. As shown in FIG. 1 and FIG. 2, the piezoelectric transformer 200 of the upper stage is connected to the connection terminals 18b, 18b, 22b, and 20b of the lower stage by connecting the mounting terminals 18c, 18c, 20c, and 22c, respectively, via the lower stage. The piezoelectric transformer 100 is mounted on a circuit board.

Further, in the piezoelectric transformer 200 of the above-described embodiment, the upper end portions 18d, 18d, 20d, and 22d of the conductive members 18, 18, 20, and 22 are not particularly used as the terminals for connection, but are provided with no In the case of the other piezoelectric transformers of the third and subsequent stages shown, the upper end portions 18d, 18d, 20d, and 22d are used as terminals for connection.

The difference with respect to the conductive members 18, 18, 20, 22 is the same as that of the piezoelectric transformer 100 of the lower stage. That is, the conductive members 18, 18 are disposed at the one end of the left side of the casing 14 in FIGS. 1, 3, and 4, and are disposed in pairs on the right side at the positions on the right side in FIG. . The two conductive wires 16 and 16 which are soldered to the primary side electrode 12a are pulled out to the outside of the casing 14 by the accommodating portion 14c, and are respectively bundled in the upper end portions 18d and 18d of the both sides. welding. Further, the conductive wire 16 may be soldered to the mounting terminal 18c.

Moreover, the conductive members 20, 22 are the same as the piezoelectric transformer 100 of the lower stage, The positions on the opposite sides of the conductive member 18 as viewed in the longitudinal direction of the casing 14 are disposed in pairs on both sides. As shown in FIGS. 3 and 4, the conductive wire 16 welded to the secondary side electrode 12b is welded in a state of being bundled on the upper end portion 20d of one of the conductive members 20. The conductive wire 16 may be welded to the mounting terminal 20c for the secondary side electrode 12b. Further, in the piezoelectric transformer 100 of the lower stage, the other conductive member 22 is electrically disconnected from the piezoelectric ceramic 12, and is a so-called empty terminal.

As shown in FIG. 1 and FIG. 2, between the piezoelectric transformer 200 of the upper stage and the piezoelectric transformer 100 of the lower stage, the arrangement of the conductive members 20 and 22 is reversed on both sides. That is, if the two piezoelectric transformers 100, 200 are superposed one above the other, the upper conductive member 22 is located on the lower conductive member 20 on one side of the casing 14, and the upper portion is on the other side. The conductive member 20 is located above the conductive member 22 of the lower stage.

[Improvement of assembly workability]

Next, in the assembly work of the piezoelectric transformer device, a configuration for stabilizing the piezoelectric transformer 200 in the upper stage during loading will be described.

Fig. 5 is a front elevational view of the entire piezoelectric transformer device. Further, in Fig. 5, the direction in which the secondary side electrode 12b is regarded as the front surface. The following is a description of FIG. 5 to FIG. 1 to FIG. 4 .

[guide]

A projection-like guide portion 14d is integrally formed in each of the housings 14 in advance at four positions on the top surface thereof. The guide portion 14d is located at the same plane as each side surface of the casing 14 above the respective projecting portions 14a, for example, by the top of the casing 14. Stand up to a certain height. Further, in the illustrated example, the length of the longitudinal direction guiding portion 14d of the casing 14 is equal to the width of the protruding portion 14a, but is not particularly limited thereto.

On the other hand, the lower end portion of each of the protruding portions 14a protrudes from the bottom surface of the casing 14 only to a certain extent below. Therefore, as shown in FIG. 1, FIG. 2 and FIG. 5, when the piezoelectric transformer 200 of the upper stage is mounted on the piezoelectric transformer 100 of the lower stage, the lower end portion of the protruding portion 14a of the upper stage is along the guiding portion 14d of the lower stage. The sides are guided and the housings 14 are positioned relative to each other. At this time, the connection terminals 18b, 18b, 20b, and 22b and the mounting terminals 18c, 18c, 22c, and 20c overlap each other vertically.

As described above, when the piezoelectric transformer 200 of the upper stage is mounted on the piezoelectric transformer 100 of the lower stage, this time becomes the state in which the lower end portion of the protruding portion 14a contacts the respective guiding portions 14d, and the piezoelectric transformer 200 of the upper stage can still be placed. Stable. According to this, it is possible to efficiently perform bonding work of the connection terminals 18b, 18b, 20b, and 22b and the mounting terminals 18c, 18c, 22c, and 20c, for example, soldering or application of a thermosetting conductive paste.

[Space for joining work]

Further, as shown in FIGS. 3 and 4, each of the conductive members 18, 18, 20, and 22 is disposed at a position spaced apart from the both side faces of the casing 14 by a certain degree. This point is also the same for the piezoelectric transformer 100 of the lower stage. In this manner, since the space for the bonding work is ensured between the side surfaces of the casing 14 and the connection terminals 18b, 18b, 20b, and 22b and the mounting terminals 18c, 18c, 22c, and 20c, the piezoelectric transformer device is manufactured. These connection terminals 18b, 18b, 20b, and 22b and mounting terminals 18c, 18c, and 22c can be easily performed in the process. Engagement work of 20c.

[Electrical connection of piezoelectric transformer in the upper stage]

In the piezoelectric transformer 200 of the upper stage, the primary side electrodes 12a of the two different polarities are connected to the connection terminal 18b of the piezoelectric transformer 100 of the lower stage through the mounting terminal 18c. At this time, by making the polarities of the primary side electrodes 12a coincide with each other in the upper and lower stages, the input sides of the two piezoelectric transformers 100, 200 can be formed side by side.

In addition, as shown in FIG. 5, the piezoelectric transformer 200 of the upper stage is connected to the connection terminal 22b of the lower stage by the mounting terminal 20c which is the left side in FIG. 5 through the secondary side electrode 12b, and becomes empty in the lower stage. The terminal mounting terminal 22a connects the mounting terminal 20c to the circuit board. According to this, the piezoelectric transformer 200 of the upper stage can be easily mounted on the circuit board without using a particularly long terminal.

[indication of direction]

Further, a marker part 14e is integrally formed on the housing 14 at one end face, for example, viewed in the longitudinal direction. The indicator portion 14e is a symbol for aligning the directions of the piezoelectric transformers 100 and 200 at the time of assembly. Since the indicator portion 14e is formed to protrude from a position that can be easily visually recognized by the outside, for example, the assembly operator may assemble the piezoelectric transformers 100 and 200 of the upper and lower stages while aligning the direction of the indicator portion 14e. According to this, a simple operation error, for example, a failure in joining the primary side electrode 12a and the secondary side electrode 12b is reliably prevented.

The piezoelectric transformer device according to the above-described embodiment is common in the shape of the casing 14 between the plurality of piezoelectric transformers 100 and 200, and thus is generated. Such as the following advantages:

(1) The design and manufacturing process of the casing 14 such as a mold are common, but the man-hours for designing and manufacturing are suppressed, and the reduction in manufacturing cost is realized.

(2) Even if the piezoelectric transformers 100 and 200 are stacked in a plurality of stages to constitute a piezoelectric transformer device, the overall mounting area does not increase to more than one part. Therefore, the piezoelectric transformers 100, 200 are mounted at a higher density on the circuit substrate.

Further, by the improvement of the structure of the casing 14, for example, the protruding portion 14a or the working space, the workability of assembling or welding the piezoelectric transformers 100 and 200 is improved, and the production efficiency of the piezoelectric transformer device is greatly improved. .

The present invention is not limited to the above-described embodiments, and can be implemented in various modifications. For example, the shape of the piezoelectric ceramic 12 is not limited to those shown in the drawings, and may be other shapes. Further, the shape of the casing 14 can be appropriately deformed in accordance with the outer shape of the piezoelectric ceramic 12.

In one embodiment, a casing 14 having a common shape is used between the piezoelectric transformers 100 and 200 in the upper and lower stages, and a casing having a different shape may be used. For example, the piezoelectric transformer 100 of the lower stage uses the casing 14 having the same shape as that of the embodiment, and the mounting area or the mounting area when the piezoelectric transformer 200 of the upper stage is projected onto the circuit board may be smaller than the casing 14. Even in this case, the piezoelectric transformer 200 of the upper stage is housed in the mounting area or the mounting area of the piezoelectric transformer 100 of the lower stage, and the mounting area of the piezoelectric transformer device in the circuit board is minimized.

In one embodiment, an example in which the piezoelectric transformers 100 and 200 are stacked in two stages is used. However, the piezoelectric transformer device may have three or more piezoelectric transformers. In one embodiment, the piezoelectric transformers 100 and 200 on the upper and lower sides may insulate the secondary side electrodes 12b from each other, and may be connected to the secondary side electrodes 12b.

In one embodiment, although the indicator portion 14e is exemplified by a protrusion shape, it may have a concave shape. Further, the means for indicating the direction may be a marking which is applied to the outer surface of the casing 14 by printing or laser printing.

In the other embodiments, the drawings and the structures shown are merely preferred examples. Of course, the present invention can be preferably implemented by adding various elements to the basic structure or replacing a part.

12‧‧‧ Piezoelectric ceramic (piezoelectric)

12a‧‧‧ primary side electrode

12b‧‧‧secondary electrode

14‧‧‧Shell

14a‧‧‧Protruding

14b‧‧‧ inserted through hole

14c‧‧‧Receiving Department

14d‧‧‧Guide

14e‧‧‧Marking Department (instruction means)

16‧‧‧Flexible wire

18, 20, 22‧‧‧ conductive members

18a, 20a, 22a‧‧‧mounting terminals

18b, 20b, 22b‧‧‧Connecting terminals

18c, 20c, 22c‧‧‧mounting terminals

18d, 20d, 22d‧‧‧ upper end of conductive member

100,200‧‧‧ piezoelectric transformer

Fig. 1 is a side view showing the configuration of a piezoelectric transformer device of an embodiment.

Fig. 2 is a side view showing the configuration of the piezoelectric transformer device from the side opposite to Fig. 1.

Fig. 3 is a bottom view showing the piezoelectric transformer of the upper stage alone.

Fig. 4 is a plan view showing the piezoelectric transformer of the upper stage alone.

Fig. 5 is a front elevational view of the entire piezoelectric transformer device.

12‧‧‧ Piezoelectric ceramic (piezoelectric)

12a‧‧‧ primary side electrode

12b‧‧‧secondary electrode

14‧‧‧Shell

14a‧‧‧Protruding

14b‧‧‧ inserted through hole

14c‧‧‧Receiving Department

14d‧‧‧Guide

14e‧‧‧Marking Department (instruction means)

16‧‧‧Flexible wire

18, 20, 22‧‧‧ conductive members

18a, 20a, 22a‧‧‧mounting terminals

18b, 20b, 22b‧‧‧Connecting terminals

18c, 20c, 22c‧‧‧mounting terminals

18d, 20d, 22d‧‧‧ upper end of conductive member

100,200‧‧‧ piezoelectric transformer

Claims (24)

A piezoelectric transformer device, comprising: a first piezoelectric transformer mounted on a circuit substrate in a state in which a first piezoelectric body is housed in a first housing; and a second piezoelectric transformer in a second housing The second piezoelectric body is housed and mounted on the circuit substrate via the first piezoelectric transformer in a state of being mounted above the first piezoelectric transformer, and a mounting area projected on the circuit substrate is the first piezoelectric The first conductive member and the second conductive member are respectively disposed in the first housing and the second housing in a range of the mounting area of the transformer in the circuit board, and the first conductive member is connected to the circuit as a lower end portion The first mounting terminal of the wiring pattern of the substrate is formed, the upper end portion is formed as a first connection terminal connected to the second piezoelectric transformer, and the second conductive member is formed as a lower end portion as a connection with the first piezoelectric transformer It is formed by the second mounting terminal to which the terminal is connected. The piezoelectric transformer device of claim 1, wherein the first and second housings have a predetermined shape common to each other. The piezoelectric transformer device of claim 2, wherein the first and second housings each have a protruding portion formed by a side protrusion, the first piezoelectric transformer having: a protruding portion penetrating the first housing and Extending in the up-and-down direction, the lower end portion is formed as a first mounting terminal connected to the wiring pattern of the circuit substrate, and the upper end portion is bent along the top surface of the protruding portion and serves as the second piezoelectric a first conductive member formed by the first connection terminal connected to the transformer, The second piezoelectric transformer has a protruding portion penetrating the second casing and extending in a vertical direction, and a lower end portion is bent along a bottom surface of the protruding portion and connected as a terminal for connection to the first piezoelectric transformer a second conductive member formed by the second mounting terminal, wherein the second mounting terminal and the first connecting terminal are joined to each other in a state where the second piezoelectric transformer is mounted on the first piezoelectric transformer . The piezoelectric transformer device of claim 3, wherein the first connection terminal and the second connection terminal are provided by the side surfaces of the first and second housings, respectively A space for joining work is ensured between the connection terminal and the second mounting terminal. The piezoelectric transformer device of claim 4, wherein the first piezoelectric transformer has: an upper portion disposed on the first housing, and the first housing is mounted in a state in which the second piezoelectric transformer is loaded A guiding portion for positioning the second housing is performed. The piezoelectric transformer device of claim 5, wherein the guiding portion protrudes from a top surface of the first housing, and the protruding portion protrudes at least from a bottom surface of the second housing. In a state where the second piezoelectric transformer is mounted on the first piezoelectric transformer, the second housing is positioned to the first housing by the protruding portion being guided by the guiding portion. The piezoelectric transformer device according to any one of claims 3 to 6, wherein the protruding portion and the conductive member are respectively disposed at four places in the first and second housings, the first piezoelectric a transformer for the four locations formed at the first housing Two of the protruding portions, the first mounting terminal and the first connecting terminal are respectively connected to the two primary side electrodes of the piezoelectric body, and one of the other two of the first mounting terminals And the first connection terminal is connected to the secondary side electrode of the piezoelectric body, and the other of the first mounting terminal and the first connection terminal are not connected to the piezoelectric body, and the second piezoelectric transformer is Two of the protrusions formed at four locations of the second housing, the second mounting terminals are respectively connected to the two primary side electrodes of the piezoelectric body, and in the other two, one of the two The second mounting terminal is not connected to the piezoelectric body, and the other second mounting terminal is connected to the secondary side electrode of the piezoelectric body, and the second piezoelectric element is mounted on the first piezoelectric transformer In the state of the electric transformer, the second mounting terminal connected to the other of the secondary side electrodes of the piezoelectric body and the first piezoelectric transformer are not connected to the piezoelectric body The other one of the first connection terminals is engaged, and the needle The second piezoelectric transformer is configured such that the second mounting terminal that is not connected to the secondary side electrode of the piezoelectric body is for the first piezoelectric transformer and one of the secondary side electrodes connected to the piezoelectric body The first connection terminal is joined. The piezoelectric transformer device according to any one of claims 1 to 6, wherein the first and second housings have indicating means for indicating the direction of assembly of each other at a position visually identifiable from the outside. The piezoelectric transformer device of claim 1, wherein the first and second housings each have a protrusion formed by a side protrusion. The first piezoelectric transformer has a protruding portion penetrating the first casing and extending in a vertical direction, and a lower end portion is formed as a first mounting terminal connected to a wiring pattern of the circuit substrate, and the upper end portion is along a top surface of the protrusion is bent and serves as a first conductive member formed by a first connection terminal connected to the second piezoelectric transformer, the second piezoelectric transformer having: a protrusion penetrating the second housing The portion extends in the up-and-down direction, and the lower end portion is a second conductive member which is bent along the bottom surface of the protruding portion and serves as a second mounting terminal connected to the connection terminal of the first piezoelectric transformer. In the state in which the second piezoelectric transformer is mounted on the first piezoelectric transformer, the second mounting terminal and the first connecting terminal are joined to each other. The piezoelectric transformer device of claim 9, wherein the first connection terminal and the second mounting terminal are provided by the side surfaces of the first and second housings, respectively A space for joining work is ensured between the connection terminal and the second mounting terminal. The piezoelectric transformer device of claim 10, wherein the first piezoelectric transformer has: an upper portion disposed on the first housing, and the first housing is mounted in a state in which the second piezoelectric transformer is loaded A guiding portion for positioning the second housing is performed. The piezoelectric transformer device of claim 11, wherein the guiding portion protrudes from a top surface of the first housing, and the protruding portion protrudes at least from a bottom surface of the second housing. In a state where the second piezoelectric transformer is mounted on the first piezoelectric transformer, the second housing is guided by the guiding portion by the guiding portion The first housing is positioned. The piezoelectric transformer device according to any one of the preceding claims, wherein the protruding portion and the conductive member are respectively disposed at four places in the first and second housings, the first piezoelectric The transformer is respectively connected to the two primary side electrodes of the piezoelectric body at two of the protruding portions formed at four places of the first housing, and One of the other two of the first mounting terminals and the first connecting terminal is connected to the secondary side electrode of the piezoelectric body, and the other of the first mounting terminal and the first connecting terminal The piezoelectric body is not connected, and the second piezoelectric transformer is respectively connected to the two of the protruding portions of the second housing One of the other two positions, the second mounting terminal is not connected to the piezoelectric body, and the other second mounting terminal is connected to the secondary side electrode of the piezoelectric body. Loading the second piezoelectric transformer on the first piezoelectric transformer a state in which the second piezoelectric transformer is connected to the other of the secondary side electrodes of the piezoelectric body, and the other of the second piezoelectric transformers is not connected to the piezoelectric body The first connection terminal is joined to the second piezoelectric transformer, and the second mounting terminal that is not connected to the secondary side electrode of the piezoelectric body is connected to the first piezoelectric transformer The first connection terminal of one of the secondary side electrodes of the piezoelectric body is joined. The piezoelectric transformer device of claim 3, wherein the first piezoelectric transformer has: an upper portion disposed on the first housing, and the first housing is mounted in a state in which the second piezoelectric transformer is loaded A guiding portion for positioning the second housing is performed. The piezoelectric transformer device of claim 14, wherein the guiding portion protrudes from a top surface of the first housing, and the protruding portion protrudes at least from a bottom surface of the second housing. In a state where the second piezoelectric transformer is mounted on the first piezoelectric transformer, the second housing is positioned to the first housing by the protruding portion being guided by the guiding portion. The piezoelectric transformer device of claim 14 or 15, wherein the protruding portion and the conductive member are respectively disposed at four places in the first and second housings, and the first piezoelectric transformer is formed on Two of the protruding portions of the first casing, the first mounting terminal and the first connecting terminal are respectively connected to the two primary side electrodes of the piezoelectric body, and in the other two places One of the first mounting terminals and the first connecting terminal is connected to the secondary side electrode of the piezoelectric body, and the other of the first mounting terminal and the first connecting terminal and the piezoelectric body are not Connecting, the second piezoelectric transformer is disposed at two of the protrusions formed at four locations of the second housing, the second mounting terminals being respectively connected to the two primary side electrodes of the piezoelectric body, and In the other two places, one of the second mounting terminals is not connected to the piezoelectric body, and the other of the second mounting terminals is connected to the secondary side electrode of the piezoelectric body. In a state in which the second piezoelectric transformer is mounted on the first piezoelectric transformer, the second piezoelectric transformer is connected to the second mounting terminal of the second side electrode of the piezoelectric body and The first piezoelectric transformer is joined to the other first terminal for connection that is not connected to the piezoelectric body, and the second piezoelectric transformer is not connected to the secondary electrode of the piezoelectric body. The second mounting terminal is joined to the first piezoelectric transformer and to the first connection terminal connected to one of the secondary side electrodes of the piezoelectric body. The piezoelectric transformer device of claim 9, wherein the first piezoelectric transformer has: an upper portion disposed on the first housing, and the first housing is mounted in a state in which the second piezoelectric transformer is loaded A guiding portion for positioning the second housing is performed. The piezoelectric transformer device of claim 17, wherein the guiding portion protrudes from a top surface of the first housing, and the protruding portion protrudes at least from a bottom surface of the second housing. In a state where the second piezoelectric transformer is mounted on the first piezoelectric transformer, the second housing is positioned to the first housing by the protruding portion being guided by the guiding portion. The piezoelectric transformer device of claim 17 or claim 18, wherein the protruding portion and the conductive member are respectively disposed at four places in the first and second housings, and the first piezoelectric transformer is formed on Two of the protruding portions at four locations of the first housing, the first mounting terminal and the first connecting terminal Each of the two primary side electrodes of the piezoelectric body is connected to the two primary side electrodes of the piezoelectric body, and one of the first mounting terminals and the first connecting terminal is connected to the secondary side electrode of the piezoelectric body. The other first mounting terminal and the first connecting terminal are not connected to the piezoelectric body, and the second piezoelectric transformer is located at two of the protruding portions formed at four places of the second housing, The second mounting terminals are respectively connected to the two primary side electrodes of the piezoelectric body, and in the other two places, one of the second mounting terminals is not connected to the piezoelectric body, and the other of the two a mounting terminal is connected to the secondary side electrode of the piezoelectric body, and the second piezoelectric transformer is connected to the piezoelectric body in a state where the second piezoelectric transformer is mounted on the first piezoelectric transformer The second mounting terminal of the other of the secondary side electrodes and the first connecting terminal for the first piezoelectric transformer that is not connected to the piezoelectric body, and for the second piezoelectric transformer Is not connected to the secondary side electrode of the piezoelectric body The second mounting party terminal for the first piezoelectric transformer, and the secondary side is connected to one electrode of the piezoelectric body joining the first connecting terminal. A piezoelectric transformer device according to any one of the ninth, the tenth, the eleventh, the eleventh, the fourth, the The second housing has indicating means for indicating the direction of assembly of each other at a position visually identifiable from the outside. The piezoelectric transformer device of claim 7, wherein the first and second housings have a position that can be visually confirmed from the outside. This means of indicating the direction of assembly. The piezoelectric transformer device of claim 13, wherein the first and second housings have indicating means for indicating the direction of assembly of each other at a position visually identifiable from the outside. The piezoelectric transformer device of claim 16, wherein the first and second housings have indicating means for indicating the direction of assembly of each other at a position visually identifiable from the outside. The piezoelectric transformer device of claim 19, wherein the first and second housings have indicating means for indicating the direction of assembly of each other at a position visually identifiable from the outside.