KR20000040784A - Substrate coupling unit for piezoelectric transformer - Google Patents

Abstract

PURPOSE: A substrate coupling unit for a piezoelectric transformer is provided to reduce a vibration damping of a piezoelectric body, to reduce a fabrication cost, and to improve productivity. CONSTITUTION: A piezoelectric transformer(1) includes a piezoelectric body(10) having input terminals(12a,12b) formed on both opposing sides thereof and output terminals(14) formed on the other sides. When the piezoelectric transformer(1) is disposed above and coupled to a substrate(30) having input and output terminals(32a,32b), a substrate coupling unit including supporting members(40) and coupling members(50) is used. The supporting members(40) use straight or bending rods to respectively connect with both the piezoelectric body(10) and the substrate(30) at points(P1,P2) by bonding materials(20a,20b), whereas the coupling members(50) use lead wires(50a) or bending rods. A longitudinally vibrating displacement is minimized at the points(P1,P2), and the input terminals(12a,12b,32a) are disposed at the point(P1). Therefore, a vibration damping of the piezoelectric body(10) is reduced.

Description

Piezoelectric Transformer Substrate Bonding Device

The present invention relates to a piezoelectric transformer. More particularly, the piezoelectric transformer is mounted on a substrate as a supporting member without using a separate case as an injection structure, thereby reducing the number of parts and simplifying the manufacturing process. The present invention relates to a piezoelectric transformer substrate joining device which can reduce the cost and facilitate the miniaturization of components.

In general, a voltage of about 500 volts is required to drive a liquid crystal display backlight of a notebook computer. To generate such a driving voltage, a booster transformer is needed to boost a commercial AC power supply. The transformer is generally formed by winding a coil around an iron core. However, such transformers using iron cores and coils cannot be applied to liquid crystal displays such as notebook computers because they do not meet the requirements of suppressing noise, reducing power consumption, and miniaturizing devices.

Therefore, in recent years, the use of a piezoelectric transformer using a piezoelectric effect as a liquid crystal display backlight driving transformer of a notebook computer or the like is common, and such a piezoelectric transformer is not only a liquid crystal display but also a charger, an adapter and a DC. It is also applied to a DC converter.

Such a general piezoelectric transformer, as shown in FIG. 1, is generally formed in a rectangular plate shape, one half of a portion of the piezoelectric body 110 polarized in half in the thickness direction and the other half in the longitudinal direction is used for thickness. The input side external electrodes 120a and 120b are formed to face each other, and the output side external electrode 130 is formed on the other side of the piezoelectric body 110, and the input side electrode 120 portion is usually driven by the driving unit and the other electrode portion 130. When the input voltage of the natural resonant frequency is applied to the driving unit, strong mechanical vibration is generated in the longitudinal direction, whereby the power generating unit generates electric charges with a piezoelectric effect and obtains a high voltage (V) at the output terminal.

In the substrate bonding structure of the conventional piezoelectric transformer 100 related to the above technique, as shown in FIGS. 2 and 3, both sides and bottom two points P1 inside the case 200 having a rectangular frame shape opened upward. In the P2, the side protrusion 210 and the bottom protrusion 220 are installed to support both side and bottom surfaces of the piezoelectric transformer 100 seated on the case 200, respectively, and the two points are piezoelectric transformers. Vibration node is generated to the minimum vibration of 100, the input and ground-side lead wire 250a and the ground connected to the input electrode 120 via cutouts 240a, 240b formed on both sides of the case 200. The lead wire 250b connected to the output side external electrode 130 is solder-coupled to the input and output external terminals 310a and 310B formed on the substrate 300 when the case 200 is adhesively bonded onto the substrate 30. It is made of structure.

Therefore, in the substrate bonding structure of the conventional piezoelectric transformer as described above, an operator first places the piezoelectric transformer 100 inside the case 200 to draw out the lead wires 250 to the outside, and the case 200. After inverting and bonding a silicon adhesive or metal bracket on the substrate 300, the lead wire 250 is soldered and connected to each terminal 310 of the substrate 300, each projection 210 of the case 200 ) 220 is installed so as to contact the two points P1, P2, which is the vibration node that the longitudinal vibration displacement of the piezoelectric transformer 100 is a minimum, the case 200 is turned upside down on the substrate 300, the upper projection 230 After the fixing is fixed to the fixing groove 320 of the substrate 300, it is bonded with a silicone adhesive or the like, or a silicon adhesive may be attached to the contact portion between the piezoelectric body 110 and the projections 210 and 220.

However, in the substrate bonding structure of the conventional piezoelectric transformer as described above, as shown in FIGS. 2 and 3, the process of inserting the small piezoelectric transformer 100 into the case 200 and the lead wire 250 are performed. There was a problem that the connection work of the terminal 310 becomes difficult and not only the workability is lowered, but also the assembly and fixation by automation is difficult and the productivity is lowered.

In addition, since the case 200, which is a separate injection structure, is required, and the substrate bonding operation of the case 200 is additionally required, there is a problem in that manufacturing cost is increased due to an increase in the number of parts.

In particular, although not shown in the drawing, although the vibration direction of the piezoelectric transformer 100 is mostly made in the longitudinal direction of the piezoelectric body 110, the vibration in the thickness direction is generated finely, which is integrated into the case 200. Due to the support structure by the protrusions 210 and 220, there are various problems such as lateral vibration as well as vibration in a fine thickness direction, thereby degrading the operability of the piezoelectric transformer 100.

SUMMARY OF THE INVENTION The present invention has been made to improve the above-mentioned problems, and its object is to mount a piezoelectric transformer as a support member on a substrate without a case, which is a separate injection structure, so that the thickness and length of the piezoelectric body By minimizing the vibration attenuation, it is to provide a piezoelectric transformer substrate coupling device to improve the operation efficiency of the piezoelectric transformer to improve the boosting efficiency.

In addition, another object of the present invention, there is no need for a separate case that is injection-molded due to the reduced number of parts. It is an object of the present invention to provide a piezoelectric transformer substrate coupling device that reduces manufacturing costs, improves productivity through a simplified manufacturing process, and contributes to process automation and component miniaturization.

In addition, another object of the present invention is to provide a substrate bonding apparatus of a piezoelectric transformer to facilitate the substrate mounting operation according to the electrode position of the piezoelectric transformer to be installed to improve component compatibility.

1 is a schematic perspective view showing a general piezoelectric transformer

2 is a perspective view showing a board mounting state of a conventional piezoelectric transformer;

3 is a front configuration diagram showing a board mounting state of a conventional piezoelectric transformer;

4 is a perspective view showing a substrate bonding apparatus of a piezoelectric transformer according to the present invention;

(A) and (b) of FIG. 5 is a plan view and a front view of the main portion showing 'A' and 'B' of FIG.

(c) is a side view of the main portion of the piezoelectric transformer substrate bonding apparatus of the present invention, showing the connection member;

6 (a)-(d) are schematic side views showing various shapes of a supporting member in the piezoelectric transformer substrate bonding apparatus of the present invention.

7 is a perspective view showing another embodiment of the present invention

(A) and (b) of FIG. 8 is a plan view and a front view of the main part showing 'A' and 'B' of FIG.

Figure 9 is a main part showing a lower end of the support member and the substrate bonding state of the present invention

Explanation of symbols on the main parts of the drawings

1,1 '.... Piezoelectric transformer 10 .... Piezoelectric

12,14 .... External electrode on input and output

20 .. Coupling means 30 .... Substrate

32a, 32b .... External terminal on input and output

40 .... supporting member 50 .... connecting member

As a technical means for achieving the above object, the present invention, in the piezoelectric transformer in which the input external electrode is formed on both sides of the half portion of the piezoelectric body, the output side external electrode is formed on the other side,

An upper end connected to two points P1 and P2 on both sides of the piezoelectric body as coupling means, and a lower end connected to the input terminal formed on the substrate positioned below the piezoelectric transformer and to the substrate as coupling means, respectively; ,

According to the present invention, a piezoelectric transformer substrate coupling apparatus including a connection member for connecting and connecting the output side external electrode of the piezoelectric body and the output side external terminal formed on the substrate as a coupling means.

In addition, in a piezoelectric transformer in which an input external electrode is formed on both sides of one half of the piezoelectric body, and an output external electrode is formed on both sides of the other half of the piezoelectric body.

A piezoelectric element comprising a support member formed of a rod having an upper end connected as a coupling means to two points of the input and output side external electrodes of the piezoelectric body, and having a rod coupled to the input and output external terminals and a coupling means formed on the substrate. By providing a substrate coupling device of the transformer.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 4 is a perspective view showing a substrate bonding apparatus of a piezoelectric transformer according to the present invention, Figure 5 (a) and (b) is a plan view and front view of the main portion showing 'A' and 'B' of Figure 4, ( (c) is a side view of the main portion of the piezoelectric transformer substrate bonding apparatus of the present invention, Figure 6 (a)-(d) is a plurality of shapes of the support member in the piezoelectric substrate substrate bonding apparatus of the present invention. As a schematic side view illustrating the piezoelectric transformer substrate coupling apparatus of the present invention, the support member 40 and the connection member 50 are configured.

On both sides of the piezoelectric body 10 which have been processed and polarized, the input side external electrodes 12a and 12b constituting the power generating portion of the piezoelectric transformer 1 are formed on opposite sides of the piezoelectric body 10, respectively. On the other side, the piezoelectric transformer 1 having the output external electrodes 14 forming the power generation unit is provided.

In addition, the support member 40 which allows the piezoelectric body 10 to be bonded to the substrate has an upper end connected to two points P1 and P2 on both sides of the piezoelectric body 10 as coupling means 20a and 20b. The lower end of the support member 40 is coupled to the input side external terminal 32a formed on the substrate 30 and the coupling means 20a and 20b on the substrate 30, and the support member 40 is piezoelectric. It is formed by the linear rod 40a or the polygonal rod 40b according to the support shape of the transformer 1.

In addition, the two points P1 and P2 of the piezoelectric body 10 are vibration nodes at which the longitudinal vibration displacement is minimized, and the input electrodes 12a and 12b of the piezoelectric body 10 are formed of the piezoelectric body 10. Coupling means (20a) formed at the one point (P1), connecting the support member 40 made of a rod to the input side electrodes 12a, 12b and the input side external terminal 32a formed on the substrate 30 Silver conductive resin is formed, and the coupling means 20b for connecting the support member 40 to the other point P2 of the piezoelectric body 10 and the substrate 30 is formed of a silicone adhesive.

In addition, the connecting member 50 is a lead wire 50a for connecting and connecting the output side external electrode 14 of the piezoelectric body 10 and the output side external terminal 32b formed on the substrate 30 as coupling means 20a. Or a polygonal rod 50b having a vertical tip 50b1 in close contact with the other side of the piezoelectric body 10 in the longitudinal direction and a horizontal rear end 50b2 in close contact with the output side external terminal 32b of the substrate 30. Is formed.

On the other hand, the connecting member 50 made of a lead wire 50a or a polygonal rod 50b connecting the output side external electrode 14 of the piezoelectric body 10 to the output side external terminal 32b of the substrate 30 is connected. Coupling means (20 ') (20b) is made of a conductive resin formed of a solder or polypyrole (polyphyrole) or the like.

Referring to the operation of the present invention made in the above configuration in detail as follows.

As shown in Figs. 4 to 6, the input side external electrodes 12a and 12b are formed on both sides of the piezoelectric body 10, which have been processed and polarized, on both sides facing each other. Although not shown. The inner electrode portions of the stacked piezoelectric sheets are intersected with each other and silver plated on the side surfaces. The reason why the input side external electrodes 12 are formed on both sides of the piezoelectric body 10 is easy to connect with the support member 40. To do that.

On the other hand, since the output side external electrode 14 is formed on the other side of the piezoelectric body 10, when a high voltage is applied through the input side electrode 12, vibration generated in the longitudinal direction of the piezoelectric body 10 is output side external electrode 14 ) Is boosted to high voltage by the piezoelectric effect.

In this case, as shown in FIG. 4, the piezoelectric body 10 is mounted on the substrate 30 using the support member 40 directly without using a case as in the prior art, and the support member 40 is It is connected to the two points P1 and P2 on both sides of the piezoelectric body 10 as coupling means 20, and the two points P1 and P2 generally have a minimum longitudinal vibration displacement of the piezoelectric body 10. The vibration node is, thus, the input electrodes 12 are formed at points P1 and P2 having the minimum vibration displacement, and the support members 40 are connected to minimize vibration attenuation of the piezoelectric transformer 1.

In addition, as shown in Figs. 4 and 5, the connection method between the supporting member 40 and the input external electrode 12 and the input external terminal (pattern) 32a of the substrate 30 is made of a conductive resin. The coupling means 20a is connected to each other, and the support member 40 and the piezoelectric body 10 and the substrate 30 on the opposite side are connected as the coupling means 20b made of a silicone adhesive, and thus the coupling means 20a ( The reason why 20b) is different is that it depends on the electrical communication when connecting the supporting member 40 member to the electrode portion and the piezoelectric and substrate portion only.

In addition, as shown in FIG. 6, the support member 40 is formed of a straight rod 40a or a polygonal rod 40b according to the support shape of the piezoelectric transformer 1, preferably the piezoelectric transformer 1. It is preferable to use a polygonal rod 40a capable of supporting the piezoelectric body 10 more stably according to the output capacity of the < RTI ID = 0.0 >

Subsequently, the lead wire 50a or the other side of the piezoelectric body 10 is connected to connect the output side external electrode 14 of the piezoelectric body 10 and the output side external terminal 32b formed on the substrate 30. Using a connecting member 50 made of a polygonal rod 50b having a vertical tip 50b1 closely contacted in a direction and a horizontal rear end 50b2 closely contacted to an output side external terminal 32b of the substrate 30 in a lateral direction. It is connected as coupling means 20a made of a phase resin to output a voltage.

At this time, when the lead wire 50a is used, the output side external electrode 14 and the substrate external terminal 32b are soldered and connected. On the contrary, when the polygonal rod 50b is used, as described above, the conductive resin 20a is used. Are electrically connected to each other, and the conductive rubber of the coupling means 20a described above is usually used as polypyrrole.

7 and 8 illustrate another embodiment of the present invention, and the piezoelectric body (1) of the piezoelectric transformer 1 'of the output side external electrodes 14a and 14b is not formed on the other side of the piezoelectric body 10. It is formed on both sides of the remaining half of 10) and is connected directly to the output side external terminal 32b formed on the substrate 30 as the support member 40 only.

As shown in FIG. 6, input side external electrodes 12a and 12b are formed on both sides of the piezoelectric body 10 opposite to each other, and output side external electrodes 14a on both sides facing the other half of the piezoelectric body 10. ) 14b is formed, and the input and output side external electrodes 12 and 14 of the piezoelectric body 10 are connected to each other by a rod as coupling means 20a made of a conductive resin at two points P1 and P2 which are vibration nodes. The upper end of the supporting member 40 is connected, and the lower end of the supporting member 40 is a coupling means 20a made of conductive resin and the input and output side external terminals 32a and 32b formed on the substrate 30. It is made up of a connected structure.

Referring to the operation of another embodiment of the present invention made of the above configuration as follows.

As shown in FIG. 7 and FIG. 8, input side external electrodes 12a and 12b are formed on both sides of the piezoelectric body 10 facing each other, and the output side outside on both sides facing the other half. As the electrodes 14a and 14b are formed, as shown in FIG. 4, the output side external electrode 14a is compared with the piezoelectric transformer 1 formed on the other side of the piezoelectric body as shown in FIG. 4. ) 14b is formed on both sides of the remaining 1/2 of the input electrode 12 of the piezoelectric body 10.

In this case, although not shown in the drawing, the position of the output electrodes 14a and 14b is shifted, referred to as an output impedance conversion piezoelectric transformer 1 ′, and the protruding electrode portions on the plurality of piezoelectric sheets stacked inside as described above are They cross each other and are plated with silver on the surface of the piezoelectric body 10 to form the output external electrodes 14.

In addition, as described above, the input and output external electrodes 12 and 14 of the piezoelectric body 10 are coupled to each other by a straight rod 40a or a polygonal rod 40b at two points P1 and P2 which are vibration nodes. And the coupling means 20a is made of a conductive resin, and the lower end of the support member 40 is made of a conductive resin with the input and output external terminals 32a and 32b formed on the substrate 30, respectively. Connected as a coupling means 20a.

Therefore, when a high voltage is applied through the input side external terminal 32a, a voltage is applied through the input side external electrodes 12a and 12b and the high voltage through the output side external electrodes 14a and 14b due to the vibration of the piezoelectric element 10. This is what happens.

At this time, as shown in Figure 9, the lower end of the rod supporting member 40 is firmly coupled as the coupling means 20 through the substrate 30 in a state bent in the L-shape, thereby the piezoelectric transformer (1) ) (1 ') the board is in a firm bonding state.

Accordingly, since the piezoelectric body 10 is directly coupled to the substrate 30 by the support member 40 made of a rod without the need for a separate case, the vibrating operability of the piezoelectric transformers 1 and 1 'is improved. As well as being improved, the simple structure reduces the number of parts.

As described above, according to the substrate bonding apparatus of the piezoelectric transformer of the present invention, since the piezoelectric transformer is mounted on the substrate as a supporting member without the need for a separate case, the piezoelectric transformer is not restrained from vibrating in the thickness direction and the longitudinal direction. It is effective in improving the operability of the trance.

In addition, due to the reduced number of parts, there is no need for a separate case to be injected. The manufacturing cost is reduced, the productivity is improved by the simplified assembly process, the assembly is possible by the automation, and contributes to the miniaturization of parts.

In addition, according to the electrode position of the piezoelectric transformer is easy to cope with the excellent effect that the component compatibility is greatly improved.

Claims (16)

In the piezoelectric transformer 1 in which the input external electrodes 12a and 12b are formed on both sides of the piezoelectric body 10 and the output external external electrodes 14 are formed on the other side thereof. An upper end is connected to two points P1 and P2 of both sides of the piezoelectric body 10 as coupling means 20, and the lower end is formed on the substrate 30 positioned below the piezoelectric transformer 1. A support member 40 fixedly coupled to the terminal 32a and the substrate 30 as coupling means 20, respectively, Piezoelectric element characterized in that it comprises a connecting member 50 for connecting and connecting the output side external electrode 14 of the piezoelectric body 10 and the output side external terminal 32b formed on the substrate 30 as the coupling means 20. Transformer Board Bonding Device The substrate bonding apparatus of a piezoelectric transformer according to claim 1, wherein the support member (40) comprises a rod (40a). The substrate bonding apparatus of a piezoelectric transformer according to claim 2, wherein the rod (40a) is a straight rod. The piezoelectric transformer substrate coupling device according to claim 2, wherein the rod (40b) is a polygon rod that is bent and fixed to at least two surfaces of the piezoelectric body (10). The piezoelectric transformer substrate coupling device according to claim 1, wherein the two points P1 and P2 of the piezoelectric body 10 are vibration nodes having a minimum vibration displacement in the longitudinal direction. The substrate coupling apparatus of claim 1 or 5, wherein the input external electrodes 12a and 12b of the piezoelectric body 10 are formed at one point P1 of the piezoelectric body 10. The substrate coupling of a piezoelectric transformer according to claim 1, wherein the coupling means (20a) for connecting the support member (40) to the input external electrodes (12a) and (12b) and the substrate input side external terminals (32a) is a conductive resin. Device The piezoelectric transformer according to claim 1 or 5, wherein the coupling means (20b) for connecting the support member (40) to the other point (P2) of the piezoelectric body (10) and the substrate (30) is a silicone adhesive. Board Bonding Device The piezoelectric transformer substrate coupling device according to claim 1, wherein the connection member (50) is a lead wire (50a). 10. The piezoelectric transformer substrate coupling device according to claim 9, wherein the coupling means (20 ') for connecting the lead wire (50a) to the output side external electrode (14) and the substrate output side external terminal (32b) is soldering. 10. The horizontal member of claim 9, wherein the connection member 50 is in close contact with the vertical end portion 50b1, which is in close contact with the other side surface of the piezoelectric body 10, and the output side outer terminal 32b of the substrate 30. Substrate coupling device of the piezoelectric transformer, characterized in that consisting of a polygonal rod (50b) having a rear end (50b2) 11. The method of claim 10, wherein the coupling means 20b for connecting the output side external electrode 14 of the piezoelectric body 10 and the output side external terminal 32b of the substrate 30 with the polygonal rod 50b is a conductive resin. Piezoelectric transformer substrate coupling device The piezoelectric transformer substrate coupling device according to claim 1, wherein the lower end of the support member (40) is bent and connected in an L shape through the substrate (30) so as to be firmly connected to the substrate (30). Piezoelectric transformer 1 ′ in which the input external electrodes 12a and 12b are formed on both sides of one half of the piezoelectric body 10 and the output external electrodes 14a and 14b are formed on both sides of the other half of the piezoelectric body 10. ), Input and output side external terminals formed on the substrate 30, the lower ends of which are connected as coupling means 20a to two points P1 and P2 of the input and output side external electrodes 12 and 14 of the piezoelectric body 10. Substrate bonding apparatus of a piezoelectric transformer, characterized in that it comprises a support member 40 made of a rod coupled to the (32a) (32b) and the coupling means (20a) The piezoelectric transformer substrate coupling device according to claim 12, wherein the two points P1 and P2 of the piezoelectric body 10 are vibration nodes whose longitudinal vibration displacement is minimized. The coupling means according to claim 12 or 13, wherein the support member (40) is connected to the input and output side external electrodes (12) (14) and the input and output side external terminals (32a) and (32b) of the substrate (30). 20a is a piezoelectric transformer substrate bonding apparatus characterized in that the conductive resin