JP2009130311A - Method of packaging piezoelectric transformer, and piezoelectric transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of packaging a piezoelectric transformer, in which effective measures are taken against pyroelectricity in a process of packaging a piezoelectric transformer by applying heat thereto; and to provide the piezoelectric transformer. <P>SOLUTION: The piezoelectric transformer 10 is configured by having a piezoelectric ceramics 12 housed in a case body 14. A primary-side electrode 12a of the piezoelectric ceramics 12 is connected to a primary-side terminal 18a of the case body 14. Moreover, the case body 14 includes two terminals 18b for short-circuiting, which is projecting from the outside surface of the case body in a one-end direction. These terminals 18b for short-circuiting are connected by an electroconductive tool 22 and is subjected to processing in a solder flow tank or the like while short-circuiting the primary-side electrodes 12a, thereby making electric charges due to pyroelectric effect disappear. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a piezoelectric transformer mounting method and a piezoelectric transformer.

Conventionally, when the ambient temperature of piezoelectric ceramics used in piezoelectric transformers changes, the so-called pyroelectric effect works, and electric charges are generated in the direction opposite to the polarization direction between the primary side electrodes, or discharge is likely to occur. The problem is known. As a countermeasure against this pyroelectricity, a prior art is known in which an impedance having a magnitude equal to or larger than the impedance value between the drive unit electrodes is connected in parallel between the primary terminals of the piezoelectric transformer (for example, see Patent Document 1).
Japanese Unexamined Patent Publication No. 2000-307166 (FIG. 3)

  The above-described prior art technique pays attention to a change in ambient temperature when the piezoelectric transformer is driven, and takes measures against the pyroelectric effect generated at that time. That is, the pyroelectric countermeasure impedance (resistance) is connected between the primary electrodes in a state of being incorporated in a circuit on the substrate separately from the piezoelectric transformer.

  However, the pyroelectric effect does not occur only when the piezoelectric transformer is driven. That is, when a piezoelectric transformer is soldered by a flow method or a reflow method or mounted on a circuit board using a thermosetting conductive paste, a pyroelectric effect is generated in the piezoelectric body by heat applied from the outside. In this regard, the countermeasures of the prior art are not useful unless the piezoelectric transformer has already been mounted on the circuit board, and do not serve as a countermeasure against pyroelectricity in the process of the mounting work.

  Accordingly, the present invention is intended to provide a piezoelectric transformer mounting method and a piezoelectric transformer which are effective in countermeasures against pyroelectricity in the process of mounting the piezoelectric transformer by applying heat.

  First, the piezoelectric transformer mounting method according to the present invention includes assembling a piezoelectric transformer by housing a piezoelectric body in a case body, and placing a solder flow bath in a state where terminals provided on the case body are inserted into insertion holes of a circuit board. The terminal is soldered by passing it through. The piezoelectric body has primary electrodes formed at two locations on its outer surface, and secondary electrodes are formed at other locations. In addition, the case body has two primary terminals and at least one secondary terminal. With the piezoelectric body accommodated in the case body, the two primary side electrodes are respectively used as the primary terminal of the case body. A piezoelectric transformer can be assembled by connecting the secondary electrode to the secondary terminal.

  In addition, according to the mounting method of the present invention, a plurality of short terminals protruding from the outer surface of the case body are provided, and these short terminals are previously connected to at least two primary side electrodes of the piezoelectric body. In the present invention, before passing the piezoelectric transformer and the circuit board through the solder flow tank, at least two shorting terminals are connected to each other with a conductive jig, and at least the primary electrodes of the piezoelectric body are short-circuited. This solves the above problem.

  According to the mounting method of the present invention, even if a pyroelectric effect occurs in the piezoelectric body due to a temperature change when passing through the solder flow tank, at least the primary side electrodes are short-circuited by the shorting terminal and the conductive jig. Therefore, discharge to the periphery due to pyroelectricity can be reliably prevented. Further, since the shorting terminal protrudes from the outer surface of the case body, the conductive jig can be easily attached from the outside of the case body, and the working efficiency can be improved accordingly.

  Secondly, the mounting method of the present invention can also be applied to reflow soldering. That is, the present invention has a piezoelectric body in which a primary electrode is formed at two locations on the outer surface and a secondary electrode is formed at other locations, and has two primary terminals and at least one secondary terminal. Housed in the case body, the primary side electrode of the piezoelectric body is connected to the primary side terminal of the case body, and the secondary side electrode is connected to the secondary side terminal to assemble the piezoelectric transformer. With the solder paste previously applied to the wiring pattern formed on the circuit board, the piezoelectric transformer primary and secondary terminals are brought into contact with the solder paste and passed through a reflow device. A piezoelectric transformer mounting method may be used in which mounting is performed by soldering to a wiring pattern on a substrate.

  In this case as well, since the discharge due to the pyroelectric effect can be prevented by short-circuiting at least the primary side electrodes in advance, an excessive load is applied to the electronic components on the circuit board in the reflow process. There is no end.

  Thirdly, the present invention may be a mounting method using a thermosetting conductive paste. In this case, the piezoelectric transformer is assembled in the same manner as described above, and the primary side terminal and the secondary side terminal of the piezoelectric transformer are thermoset while a thermosetting conductive paste is applied in advance to the wiring pattern formed on the circuit board. This is a mounting method of a piezoelectric transformer in which a terminal is connected to a wiring pattern on a circuit board by passing through a thermosetting device in contact with a conductive paste of a mold and curing of the thermosetting conductive paste. . In particular, in the present invention, the case body is provided with a plurality of short terminals protruding from the outer surface thereof, and these short terminals are connected in advance to at least two primary side electrodes of the piezoelectric body before being passed through the thermosetting device. In addition, the primary side electrodes of the piezoelectric body are short-circuited by connecting at least two shorting terminals to each other with a conductive jig.

  Even when a piezoelectric transformer is mounted using a thermosetting conductive paste as described above, a pyroelectric effect is generated in the piezoelectric body due to a temperature change in the thermosetting device. It is possible to prevent discharge due to the pyroelectric effect by short-circuiting the primary side electrodes in advance, so that an excessive load is applied to the electronic components on the circuit board in the process of passing through the thermosetting device. Absent.

  In the present invention, a plurality of short-circuit terminals are connected in advance to the primary and secondary electrodes of the piezoelectric body in both the mounting method by soldering or the mounting method using the thermosetting conductive paste. You may leave it. In this case, the primary side electrodes and the secondary side electrodes of the piezoelectric body are short-circuited by connecting a plurality of shorting terminals to each other with a conductive jig.

  In any case, it is most effective to short-circuit the primary-side electrodes as a pyroelectric measure when mounting a piezoelectric transformer by applying heat, but it is also possible to short-circuit the secondary-side electrodes together. Thus, a technically desirable form can be obtained as a countermeasure against pyroelectricity during mounting work.

  The piezoelectric transformer of the present invention has a structure suitable for the mounting method described above. That is, the piezoelectric transformer of the present invention is a case body having a piezoelectric body in which a primary side electrode is formed at least at two locations on the outer surface and a secondary side electrode is formed at other locations, and a housing portion that houses the piezoelectric body. The case body is provided in the case body and is connected to the two primary side electrodes of the piezoelectric body in a state of being housed in the housing portion, and is connected to a wiring pattern formed on a predetermined circuit board. The two primary terminals projecting from the circuit board toward the circuit board and the primary terminal are provided on the case body separately from the primary terminal and connected to the secondary electrode of the piezoelectric body while being accommodated in the accommodating portion. A secondary terminal projecting from the case body toward the circuit board to establish electrical connection with the wiring pattern formed on the circuit board, and provided at the case body and connected to at least two primary side electrodes of the piezoelectric body, respectively. Made In, in which a plurality of short-circuit terminals projecting in a direction other than the circuit board from the outer surface of the case body.

  The primary side terminal and the secondary side terminal provided in the case body protrude toward the circuit board for mounting on the circuit board, and this is the same as the existing configuration. Apart from this, in the present invention, since the plurality of short terminals protrude from the outer surface of the case body, the short terminals can be easily short-circuited from the outside of the case body. Therefore, in the process of mounting by applying heat to the piezoelectric transformer, it is possible to reliably prevent discharge from the primary electrode due to the pyroelectric effect, and to suppress adverse effects on the surrounding electronic components.

  The plurality of short terminals may be connected to the primary and secondary electrodes of the piezoelectric body. In this case, since the secondary side terminal can be short-circuited together with the primary side terminal as a pyroelectric countermeasure during the mounting operation, a technically desirable form of pyroelectric countermeasure can be realized.

  Note that the shorting terminal may be formed at the other end of the conductive member having the primary side terminal or the secondary side terminal at one end.

  In this case, for example, the structure of the present invention can be easily realized simply by extending the conductive member constituting the existing primary side terminal or secondary side terminal and projecting the other end portion from the outer surface of the case body. . For this reason, it is not necessary to add another part to form the shorting terminal, and the processing becomes easy. Therefore, the production cost of the piezoelectric transformer can be reduced, and the productivity can be improved.

  The mounting method and piezoelectric transformer of the present invention can suppress the pyroelectric phenomenon of the piezoelectric body due to temperature changes when passing through a solder flow tank or a reflow device, and can continue to maintain high quality after mounting.

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

  FIG. 1 is a perspective view showing a piezoelectric transformer 10 according to an embodiment in an exploded manner. The piezoelectric transformer 10 has a structure in which, for example, a plate-shaped piezoelectric ceramic 12 is housed and assembled in a resin case body 14 and mounted on the circuit board 16 in this state.

  More specifically, primary electrodes 12 a are formed at two locations on the outer surface of the piezoelectric ceramic 12. Although only one location is shown in FIG. 1, the primary electrode 12a is also formed on the surface opposite to the illustrated outer surface. Although not shown in FIG. 1, the piezoelectric ceramic 12 has a secondary side electrode formed at one other location (for example, the end face or the end opposite to the primary side electrode 12a in the longitudinal direction). When the piezoelectric ceramic 12 is viewed in the longitudinal direction, the portion where the primary electrode 12a is formed functions as a drive unit. Moreover, the part in which the primary side electrode 12a is not formed functions as a power generation part.

  The case body 14 has an outer shape larger than that of the piezoelectric ceramic 12, and a concave accommodating portion (not shown) is formed therein. The case body 14 has an open bottom surface, and a housing portion extends from the opening toward the inside of the case body 14. Also, the piezoelectric ceramic 12 can be accommodated in the accommodating portion so as to be inserted from the lower side in a posture in which the piezoelectric ceramics 12 are stood up as shown in the drawing. For this reason, the accommodating part has a shape slightly larger than the piezoelectric ceramic 12. In addition, the piezoelectric ceramic 12 is bonded with, for example, a silicone adhesive or the like while being accommodated in the case body 14 (accommodating portion). For this reason, the piezoelectric ceramic 12 can freely vibrate inside the case body 14 during driving, and the vibration is absorbed by the silicone adhesive.

  The case body 14 is integrally formed with projecting portions 14a on both side surfaces thereof, and the projecting portions 14a project from the side surfaces of the case body 14 to the side with a certain thickness.

  A conductive member 18 is inserted through each protrusion 14a. Each protruding portion 14a is formed with an insertion hole (not shown) for the conductive member 18, and this insertion hole extends through the inside of each protruding portion 14a in the vertical direction.

  One end portion of the conductive member 18 (the lower end portion in the illustrated state) is formed as a primary side terminal 18a. The conductive member 18 forms a pair on both sides of the case body 14, and thus the case body 14 is provided with two primary terminals 18a on both sides thereof. These primary side terminals 18 a protrude downward from the lower surface of the case body 14, that is, toward the circuit board 16.

  The other end of the conductive member 18 (the upper end in the illustrated state) is formed as a shorting terminal 18b. For this reason, the shorting terminals 18b are also provided at two places on the case body. The conductive member 18 is bent at approximately 90 ° in the direction of one end of the case body 14 (upper left direction in FIG. 1) on the upper surface of the protruding portion 14a, and the portion extending in the horizontal direction from this bent position is short-circuited. Terminal 18b. The short-circuiting terminal 18b has a tip projecting from the outer surface (end surface) of the case body 14 in one end direction.

  Further, the case body 14 is provided with a secondary terminal 20 at one end opposite to the shorting terminal 18b when viewed in the longitudinal direction. The secondary terminal 20 also projects downward from the lower surface of the case body 14, that is, toward the circuit board 16.

  Although not shown in FIG. 1, one end of a conductive wire (for example, a gold wire) is soldered to each of the two primary side electrodes 12 a of the piezoelectric ceramic 12 at a substantially central position. One end of a conductive wire (also a gold thread wire) is soldered to a secondary electrode (not shown). Then, with the piezoelectric ceramic 12 housed in the case body 14, the other end of each conductive wire is soldered in a state where it is entangled with the primary side terminal 18a or the secondary side terminal 20, respectively. As a result, the two primary side electrodes 12a are connected to the primary side terminal 18a, respectively, and the secondary side electrodes are connected to the secondary side terminal 20. Further, since the primary side terminal 18a and the short-circuit terminal 18b are integrated as the same conductive member 18, the two primary-side electrodes 12a are connected to the short-circuit terminal 18b, respectively.

  An insertion hole (through hole) 16 a for inserting and mounting the piezoelectric transformer 10 is formed in the circuit board 16. In addition, although many insertion holes are formed in the circuit board 16 at other positions, they are omitted here because they are not particularly relevant. In the case of insertion mounting, the primary side terminal 18a and the secondary side terminal 20 are inserted into the insertion holes 16a, and soldered to the wiring pattern on the back surface of the circuit board 16, or using a thermosetting conductive paste. Connected.

  Here, in the piezoelectric transformer 10 of the present embodiment, the conductive jig 22 is attached to the two short terminals 18b before the piezoelectric transformer 10 is mounted on the circuit board 16. For example, a clip made of metal (spring steel) can be used as the conductive jig 22. When the two short terminals 18 b are sandwiched together by one conductive jig 22 as shown in the figure, a short circuit occurs. Since the terminals 18b are connected to each other, the primary electrodes 12a can be easily short-circuited.

[First example of mounting method]
Next, a first example of a mounting method of the piezoelectric transformer 10 will be described.
FIG. 2 is a flowchart showing the mounting method of the first example in the order of steps. In the first example, the piezoelectric transformer 10 is mounted by flow-type soldering. Hereinafter, it demonstrates along each process.

Step S1: As a pre-process for performing soldering, the piezoelectric transformer 10 having the structure shown in FIG. 1 is assembled.
Step S2: Next, the assembled piezoelectric transformer 10 is installed on the circuit board 16. At this time, the primary side electrode 12a and the secondary side terminal 20 are inserted through the insertion holes 16a.

  Step S3: Using the conductive member 18, the two short terminals 18b are connected to each other, and the primary electrode 12a of the piezoelectric ceramic 12 is short-circuited. This step may be performed before the piezoelectric transformer 10 is installed on the circuit board 16.

  Step S4: Through the solder flow bath, the primary side electrode 12a and the secondary side terminal 20 of the piezoelectric transformer 10 are soldered to the wiring pattern on the back surface of the circuit board 16.

Step S5: The post-flow process (for example, flux cleaning) is performed on the workpiece.
Step S6: The conductive jig 22 is removed and the operation is finished. This step may be performed before the post-flow process (for example, step S5 and step S6 in FIG. 2 may be interchanged).

  The above is the flow of the first example of the mounting method. If the mounting method of the first example is adopted, even if the pyroelectric effect occurs in the piezoelectric ceramics 12 due to the temperature change during the flow, the primary electrode 12a is conductive. Since the electrical jig 22 is short-circuited, the charge due to pyroelectricity immediately disappears (or the charge does not accumulate). Therefore, an excessive charge is not applied to other electronic components on the circuit board 16 and no discharge occurs around the piezoelectric transformer 10, and the quality of the product can be continuously guaranteed even after the flow is completed.

  Next, FIG. 3 is a perspective view of the piezoelectric transformer 10 showing a second example and a third example of the mounting method. FIG. 4 is a perspective view of the piezoelectric transformer 101 showing a fourth example of the mounting method. Similarly, in the second to fourth examples, soldering by a flow method can be performed. Each will be described below.

[Second example]
In FIG. 3, (A): The 2nd example of the mounting method short-circuits the primary side electrodes 12a using the conductive jig 24 of conductive rubber, for example. The conductive jig 24 is a conductive rubber and is a flexible material. For this reason, in the second example, for example, the tips of the two short terminals 18b can be inserted into the conductive jig 24 and used.

[Third example]
In FIG. 3, (B): A third example of the mounting method is to short-circuit the primary electrodes 12a using, for example, a conductive jig 26 of a metal plate bent into a U-shape. The conductive jig 26 is a metal plate and is an elastic member. In the third example, for example, the conductive jig 26 can be attached to the two short terminals 18b from above. At this time, by sandwiching the shorting terminal 18b from both sides by the elasticity of the conductive jig 26, the conductive jig 26 and the shorting terminal 18b can be reliably connected.

[Fourth example]
FIG. 4: In the fourth example of the mounting method, the piezoelectric transformer 101 having a different form of the case body 14 from the first to third examples is mounted. In the fourth example, the primary side terminal 18 and the secondary side terminal 20 are connected to each other by the conductive member 28, and the secondary side electrode is also short-circuited together with the primary side electrode 12a. Therefore, the case body 14 is also provided with a protrusion 14a for the secondary electrode, and the secondary conductive member 21 is inserted into the protrusion 14a. The secondary terminal 20 is formed at one end of the conductive member 21, and the shorting terminal 21b is integrally formed at the other end.

  The conductive jig 28 used in the fourth example is, for example, a conductive rubber block (or a plate). In the fourth example, the conductive jig 28 can be attached to the secondary shorting terminal 21b together with the two primary shorting terminals 18b by pressure-bonding (mounting) from above. . Thereby, since the secondary side electrode can be short-circuited together with the primary side electrode 12a as a pyroelectric countermeasure at the time of soldering, it becomes a technically desirable form. Alternatively, the short terminals 18b and 21b may be protruded upward, and the conductive jig 28 may be pierced and used at these tips.

[Conductive member]
In addition, what is used as the conductive members 18 and 21 in the first to fourth examples may be a member having an impedance lower than the primary impedance of the piezoelectric transformers 10 and 101. The conductive members 18 and 21 are not particularly limited to these forms.

[Reflow method]
Next, a mounting method using the reflow method will be described. In the case of the reflow method, a wiring pattern (connection land) on the circuit board 16 in which a solder paste (cream solder) is applied in advance is used. Further, the primary side terminal 18 a and the secondary side terminal 20 are not inserted through the insertion hole 16 a but are used in a state of being bent along the mounting surface of the circuit board 16.

  In this case, in step S2 of FIG. 2, the bent primary side terminal 18a and secondary side terminal 20 are respectively placed on the corresponding solder paste, and a flux or the like is applied thereon to temporarily assemble. In step S3 of FIG. 2, the shorting terminals 18b are connected by the conductive jigs 22 to 26, and the primary electrodes 12a are short-circuited. Alternatively, as in the fourth example, the short-circuit terminals 18b and 21b are connected by the conductive jig 28, and the secondary electrode is short-circuited together with the primary electrode 12a. Next, in step S4 of FIG. 2, soldering is performed through a reflow device instead of the solder flow bath.

  Similarly, in the reflow mounting method, even if a pyroelectric effect is generated in the piezoelectric ceramic 12 due to a temperature change during reflow, the primary side electrode 12a is short-circuited by the conductive jigs 22 to 28. The charge due to disappears immediately (or no charge accumulates). Therefore, an excessive charge is not applied to other electronic components on the circuit board 16 and no discharge occurs around the piezoelectric transformer 10, and the quality of the product can be continuously guaranteed even after the flow is completed.

[Mounting method using thermosetting conductive paste]
Next, a mounting method using a thermosetting conductive paste will be described. The thermosetting conductive paste has, for example, moderate fluidity and viscosity in a normal temperature environment, and is thermoset by passing through a thermosetting device (which may be the same type as the reflow device). Such a thermosetting conductive paste is applied in advance to a wiring pattern (connection land) on the circuit board 16 in the same manner as the reflow solder paste. The primary side terminal 18a and the secondary side terminal 20 are mounted in a state of being bent along the mounting surface of the circuit board 16, for example, without being inserted through the insertion hole 16a, as in the reflow method.

  Before passing through the thermosetting device, in step S2 of FIG. 2, the primary side terminal 18a and the secondary side terminal 20 are temporarily brought into contact with the corresponding conductive paste. In step S3 of FIG. 2, the shorting terminals 18b are connected by the conductive jigs 22 to 26, and the primary electrodes 12a are short-circuited. Alternatively, as in the fourth example, the short terminals 18b and 21b may be connected by the conductive jig 28, and the secondary electrode may be short-circuited together with the primary electrode 12a. Next, in step S4 of FIG. 2, the conductive paste is thermally cured through a thermosetting device instead of the solder flow tank. Here, surface mounting is taken as an example, but conductive paste is applied to the back surface of the circuit board 16, and the primary side terminal 18a and the secondary side terminal 20 are inserted into the insertion hole 16a, thereby conductive paste. It may be passed through a thermosetting device in a state of being in contact with the heat curing device.

  Similarly, in the mounting method using the thermosetting conductive paste as described above, even if the pyroelectric effect is generated in the piezoelectric ceramic 12 due to the temperature change at the time of thermosetting, the primary electrode 12a becomes the conductive jig. Since it is short-circuited by 22 to 28, the charge due to pyroelectricity immediately disappears (or the charge does not accumulate). Therefore, an excessive charge is not applied to other electronic components on the circuit board 16 and no discharge occurs around the piezoelectric transformer 10, and the quality of the product can be continuously guaranteed even after the mounting is completed.

  In the piezoelectric transformer 10 according to one embodiment, since the shorting terminal 18b protrudes from one end surface of the case body in the one end direction, the conductive jigs 22 to 26 can be easily attached from the outside of the case body 14, and only that amount. The workability at the time of implementing the mounting method can be improved.

  Further, since the short terminals 18b and 21b can be integrated with the primary side terminal 18a or the secondary side terminal 20 as the conductive members 18 and 21, it is necessary to add another part for the short terminals 18b and 21b. There is no. For this reason, the manufacturing cost of the piezoelectric transformer 10 can be kept low. Further, since the short terminals 18b and 21b can be obtained by a simple process of bending the upper ends of the conductive members 18 and 21, the productivity can be improved accordingly.

  The present invention can be implemented with various modifications without being limited to the above-described embodiments. For example, the shape of the piezoelectric ceramic 12 is not limited to the illustrated shape, and may be other shapes. Further, the shape of the case body 14 can be appropriately modified in accordance with the outer shape of the piezoelectric ceramic 12.

  In the embodiment, the example in which the short-circuiting terminal 18b protrudes in the one end direction of the case body 14 is described. However, the short-circuiting terminal 18b may protrude upward from the upper surface of the case body 14.

  In addition, the structure given with illustration in the embodiment is only a preferable example, and it can be said that the present invention can be suitably implemented even if various elements are added to the basic structure or a part thereof is replaced. Not too long. Further, the work process shown in FIG. 2 is merely an example, and the order is not particularly limited.

It is the perspective view which decomposed | disassembled and showed the piezoelectric transformer of one Embodiment to the component. It is the flowchart which showed the mounting method of the 1st example in process order. It is a perspective view of the piezoelectric transformer which shows the 2nd example and 3rd example of the mounting method. It is a perspective view of the piezoelectric transformer which shows the 4th example of the mounting method.

Explanation of symbols

10, 101 Piezoelectric transformer 12 Piezoelectric ceramics (piezoelectric material)
12a Primary side electrode 14 Case body 16 Circuit board 16a Insertion hole 18 Conductive member 18a Primary side terminal 18b Short terminal 20 Secondary side terminal 21 Conductive member 21b Short terminals 22, 24, 26, 28 Conductive jig

Claims (7)

A piezoelectric body in which a primary electrode is formed at two locations on the outer surface and a secondary electrode is formed at other locations is housed in a case body having two primary terminals and at least one secondary terminal. Then, the two primary side electrodes of the piezoelectric body are respectively connected to the primary side terminals of the case body, and the secondary side electrode is connected to the secondary side terminal to assemble a piezoelectric transformer,
The piezoelectric transformer is mounted by passing through the solder flow bath with the primary and secondary terminals of the piezoelectric transformer inserted through the insertion holes of the circuit board, and soldering the terminals to the wiring pattern of the circuit board. A transformer implementation method,
The case body is provided with a plurality of short terminals protruding from the outer surface thereof, and these short terminals are previously connected to at least two primary side electrodes of the piezoelectric body,
Before passing through the solder flow tank, at least two of the shorting terminals are connected to each other with a conductive jig, so that at least the primary electrodes of the piezoelectric body are short-circuited. Implementation method. A piezoelectric body in which a primary electrode is formed at two locations on the outer surface and a secondary electrode is formed at other locations is housed in a case body having two primary terminals and at least one secondary terminal. Then, the two primary side electrodes of the piezoelectric body are respectively connected to the primary side terminals of the case body, and the secondary side electrode is connected to the secondary side terminal to assemble a piezoelectric transformer,
With the solder paste previously applied to the wiring pattern formed on the circuit board, the primary side terminal and the secondary side terminal of the piezoelectric transformer are in contact with the solder paste and passed through a reflow device, A mounting method of a piezoelectric transformer for performing mounting by soldering each terminal to a wiring pattern on the circuit board by melting,
The case body is provided with a plurality of short terminals protruding from the outer surface thereof, and these short terminals are previously connected to at least two primary side electrodes of the piezoelectric body,
A piezoelectric transformer mounting method characterized in that, before passing through the reflow device, the primary side electrodes of the piezoelectric body are short-circuited by connecting at least two shorting terminals with a conductive jig. . A piezoelectric body in which a primary electrode is formed at two locations on the outer surface and a secondary electrode is formed at other locations is housed in a case body having two primary terminals and at least one secondary terminal. Then, the two primary side electrodes of the piezoelectric body are respectively connected to the primary side terminals of the case body, and the secondary side electrode is connected to the secondary side terminal to assemble a piezoelectric transformer,
A state in which a primary side terminal and a secondary side terminal of the piezoelectric transformer are in contact with the thermosetting conductive paste in a state in which a thermosetting conductive paste is previously applied to a wiring pattern formed on a circuit board. A method of mounting a piezoelectric transformer, which is mounted by connecting each terminal to a wiring pattern on the circuit board by curing the thermosetting conductive paste through a thermosetting device.
The case body is provided with a plurality of short terminals protruding from the outer surface thereof, and these short terminals are previously connected to at least two primary side electrodes of the piezoelectric body,
A piezoelectric transformer mounting characterized in that the primary side electrodes of the piezoelectric body are short-circuited by connecting at least two shorting terminals with a conductive jig before passing through the thermosetting device. Method. A mounting method of a piezoelectric transformer according to any one of claims 1 to 3,
A plurality of the shorting terminals are connected in advance to the primary side electrode and the secondary side electrode of the piezoelectric body,
A method for mounting a piezoelectric transformer, comprising: connecting a plurality of shorting terminals to each other with the conductive jig to short-circuit the primary side electrodes and the secondary side electrodes of the piezoelectric body. A piezoelectric body in which primary electrodes are formed at least at two locations on the outer surface, and secondary electrodes are formed at other locations;
A case body having a housing portion for housing the piezoelectric body;
Provided in the case body and connected to the two primary-side electrodes of the piezoelectric body in a state of being accommodated in the accommodating portion, and to be electrically connected to a wiring pattern formed on a predetermined circuit board. Two primary terminals projecting from the case body toward the circuit board;
Provided in the case body separately from the primary side terminal, connected to the secondary side electrode of the piezoelectric body in a state of being accommodated in the accommodating portion, and connected to a wiring pattern formed on a predetermined circuit board A secondary terminal projecting from the case body toward the circuit board to take
A plurality of short-circuit terminals provided on the case body and projecting from the outer surface of the case body in a direction other than the circuit board in a state of being connected to at least two primary side electrodes of the piezoelectric body, respectively. Piezoelectric transformer. The piezoelectric transformer according to claim 5,
The plurality of shorting terminals are:
A piezoelectric transformer, wherein the piezoelectric transformer is connected to a primary electrode and a secondary electrode of the piezoelectric body. The piezoelectric transformer according to claim 5 or 6,
The short-circuit terminal is formed at the other end of a conductive member having the primary terminal or the secondary terminal at one end.

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