KR100550851B1 - Jig and jig assembly for fabrication of piezoelectric transformers - Google Patents

Abstract

The present invention relates to a jig and a jig assembly used for manufacturing a piezoelectric transformer by attaching a piezoelectric element to a substrate at predetermined intervals by an adhesive resin. The piezoelectric transformer manufacturing jig 100 of the present invention is a flat body 102; Gripping means (104A-104D) extending at right angles from the edge of the main body (102) to detachably penetrate the substrate (110) and grip the side of the flat piezoelectric element (150); And a shorter length than the gripping means 104A-104D at right angles to the main body 102 to detachably penetrate the substrate 110 to support the bottom surface of the flat piezoelectric element 150 in parallel with the substrate 110. And extended seating means 106A, 106B. According to the present invention, the operation of attaching the piezoelectric element to the substrate using a flexible material in the piezoelectric transformer manufacturing process can be performed accurately and easily.

Piezoelectric transformers, piezoelectric elements, jigs, gripping, mounting, holes, adhesive resins

Description

JIG AND JIG ASSEMBLY FOR FABRICATION OF PIEZOELECTRIC TRANSFORMERS}             

1 is an exploded perspective view of a piezoelectric transformer according to the prior art.

2 is an exploded perspective view of a jig assembly for manufacturing a piezoelectric transformer according to a preferred embodiment of the present invention.

3 is a perspective view showing the assembled state of the jig assembly according to a preferred embodiment of the present invention.

4 is a cross-sectional view illustrating a piezoelectric element mounted on the jig assembly of FIG. 3.

5 is an exploded perspective view of a jig assembly for manufacturing a piezoelectric transformer according to a second embodiment of the present invention.

6A and 6B are cross-sectional views illustrating a coupling process of a jig assembly according to a third exemplary embodiment of the present invention.

7 is a perspective view showing a method of manufacturing a piezoelectric transformer using the jig assembly of the present invention.

8 is a cross-sectional view illustrating a subsequent step of FIG. 7.

<Explanation of symbols of main parts in drawings>

Jig: 100, 200, 300 104: Outer wall member

106: inner wall members 110, 210, 310: substrate portion

112, 212: attachment area 114, 116, 214, 216, 314: hole

150: piezoelectric element

The present invention relates to a jig and a jig assembly for use in the manufacture of piezoelectric transformers. In particular, the jig and jig assembly of the present invention are used in the manufacture of piezoelectric transformers produced by attaching piezoelectric elements to a substrate at predetermined intervals by an adhesive resin.

Recently, piezoelectric transformers using the piezoelectric effect have been actively developed as high voltage generation voltage conversion elements used in power circuits of devices requiring high voltages such as backlight inverters or deflectors of television sets. Compared with the conventional winding type electronic transformer, piezoelectric transformers have various advantages such as miniaturization and thinning, easy to use, and non-combustible because of the use of ceramic as a material, and no noise generated by electromagnetic induction.

In the development of such piezoelectric transformers, high reliability is required for the package or housing that houses the piezoelectric element. The piezoelectric element is usually composed of a driving unit and a power generating unit, and when AC voltage is applied to the driving unit (in the case of a boost type), the entire piezoelectric element vibrates to generate a high voltage in the power generating unit. Therefore, the method of supporting the piezoelectric element as the vibrator is very important in mounting the piezoelectric element. Many methods for supporting this kind of piezoelectric elements have been reported in relation to the package structure of the piezoelectric resonator.

On the other hand, since the piezoelectric element must vibrate without being affected by the fixed portion during the transformer operation, the piezoelectric element is fixed and supported in a package such as a housing at a node point where the vibration of the piezoelectric element does not occur.

One known prior art for supporting piezoelectric elements is a method of forming protrusions on a support. An example of supporting a piezoelectric element is disclosed in Korean Patent Laid-Open Publication No. 1999-0048268 entitled “ Piezoelectric Transformer ”. 1 is an exploded perspective view of a piezoelectric transformer, that is, a piezoelectric transformer disclosed in the above document.

Referring to FIG. 1, an element insertion groove or a space 24 is formed inside an element housing 23 into which a piezoelectric element of the piezoelectric transformer 21, that is, the piezoelectric element 22 is interposed, is formed on both sides of the element insertion space 24. Element support protrusions 25 and 25 ′ supporting the piezoelectric element 22 protrude from the wall surface, and the element support protrusions 25 and 25 ′ are connected to the lower portion of the element insertion space 24 to connect the piezoelectric elements ( An element mounting protrusion 26 for supporting or fixing 22 is protruded to allow the piezoelectric element 22 to be seated.

The element support protrusions 25 and 25 ′ and the element seating protrusions 26 protrudingly installed on both side walls and the bottom of the element insertion space 24 to seat and support the piezoelectric element 22 are formed in a triangular cross section. Thus, the contact area with the piezoelectric element 22 is minimized.

In this case, the element support protrusions 25 and 25 ′ and the element seating protrusions 26 are configured to be positioned at the node points of the piezoelectric element 22 in order to minimize noise of the piezoelectric element 22.

However, even in this configuration, since the support protrusion and the mounting protrusion are made of the same hard material as the housing, it is difficult to remove noise between the piezoelectric element and the protrusion. Therefore, in order to minimize noise, it is preferable to form projections for mounting and supporting the piezoelectric element with a flexible material.

As such, a method of using a non-flammable and insulating double-coated tape and a method of using an adhesive resin having non-flammable and insulating properties are commonly used to support and mount the piezoelectric element with a flexible material.

First, a method using a non-flammable double-sided tape adheres a plurality of double-sided tapes having a predetermined size and thickness to a substrate which is part of a power supply circuit. At this time, an attachment area corresponding to the outline of the flat piezoelectric element is defined on the substrate, and these double-sided tapes are attached to a predetermined position of the attachment area corresponding to the node point of the piezoelectric element. The piezoelectric transformer is then completed by attaching the piezoelectric element to the tape.

In this way, since the tape made of a flexible material attaches the piezoelectric element to the substrate at the node point, noise generated in the transformer operation can be reduced. However, it takes a lot of time to attach the tape to a predetermined position on the substrate, thus reducing the efficiency and increasing the cost of piezoelectric transformer manufacturing.

On the other hand, the method of using the adhesive resin adheres the adhesive resin of a predetermined size to the substrate which is part of the power circuit. At this time, an attachment region corresponding to the outline of the flat piezoelectric element is defined on the substrate, and the resin is attached to a predetermined position of the attachment region corresponding to the node point of the piezoelectric element. The piezoelectric transformer is then completed by attaching the piezoelectric element to the adhesive resin and curing the adhesive resin.

In this way, the adhesive resin of the flexible material adheres the piezoelectric element to the substrate at the node point, thereby reducing noise generated in the transformer operation. In addition, since the adhesive resin can be automatically discharged to the substrate by an apparatus such as an air dispenser, the cost can be reduced while increasing the efficiency compared to the piezoelectric transformer manufactured by the above-described tape.

However, since the adhesive resin is cured, so-called leveling occurs when the height decreases, the gap between the piezoelectric element and the substrate is reduced, thereby making it difficult to precisely control the gap. In addition, if the leveling of the adhesive resin occurs non-uniformly, the piezoelectric element is less likely to remain parallel to the substrate, which may cause a defect in the piezoelectric transformer.

Therefore, there is a need for a means capable of precisely controlling the attachment state of the piezoelectric element and efficiently performing the piezoelectric element attaching operation while reducing the noise by attaching the piezoelectric element to the substrate with a flexible material.

Therefore, the present invention has been made to solve the above-mentioned problems of the prior art, an object of the present invention is to provide a piezoelectric element that can accurately and easily perform the operation of attaching the piezoelectric element to the substrate with a flexible material in the piezoelectric transformer manufacturing process It is to provide a jig and jig assembly for transformer production.

The piezoelectric transformer manufacturing jig of the present invention for achieving the above object of the present invention is a flat body; Gripping means extending perpendicularly from the edge of the main body so as to be detachably extended through the substrate in contact with one surface of the main body, to grip the side of the flat piezoelectric element disposed opposite the main body around the substrate ; And a seating means extending from the main body at a length shorter than the holding means by detachably penetrating the substrate so as to support the bottom surface of the flat piezoelectric element in parallel with the substrate.

In addition, the jig assembly for manufacturing a piezoelectric transformer according to the present invention has a piezoelectric element attachment region corresponding to the outline of the flat piezoelectric element, and includes a plurality of first holes drilled along the circumference of the attachment region and at least one first hole drilled in the attachment region. A substrate portion that is part of a power supply circuit including two holes; And a flat body which is in surface contact with the substrate portion, and extends at a right angle from an edge of the main body through a first hole of the substrate portion so as to grip a side surface of the piezoelectric element disposed opposite the main body with respect to the substrate portion. A holding means, and a jig including a seating means extending from the main body to a length shorter than the holding means by passing through a second hole of the substrate portion so as to support the bottom surface of the piezoelectric element in parallel with the substrate. It is done.

Various features and advantages of the present invention will be described in detail as follows in connection with the accompanying drawings.

2 is an exploded perspective view of a jig assembly for manufacturing a piezoelectric transformer according to a preferred embodiment of the present invention. 2, a jig assembly for manufacturing a piezoelectric transformer according to a preferred embodiment of the present invention includes a jig 100 and a part of a substrate of a power supply circuit (not shown), that is, the substrate unit 110.

The jig 100 has an outer wall between a flat body 102 of equal thickness, eight outer wall members 104A-104D extending to a predetermined length at right angles from the edge of the main body 102, and outer wall members 104A, 104D. A pair of inner wall members 106A and 106B extending at right angles to the body 102 with a length shorter than the members 104A-104D. These inner wall members 106A and 106B are preferably formed so that their upper ends form planes and these planes are configured parallel to the upper surface of the main body 102.

On the other hand, the flat substrate portion 110 of the same thickness is shown above the jig 100, and the piezoelectric element 150 is illustrated above the substrate portion 110.

An attachment region 112 corresponding to the piezoelectric element 150 is formed in the substrate unit 110. That is, the contour of the attachment region 112 substantially coincides with the four edges 150A-150D, which are the contours of the piezoelectric element 150. Therefore, when the piezoelectric element 150 is coupled to the substrate unit 110 to form a piezoelectric transformer, the piezoelectric element 150 is positioned in the attachment region 112.

Eight long outer holes 114A-114D are formed at the edge of the attachment region 112. These outer holes 114A-114D are formed to accommodate the outer wall members 104A-104D of the jig 100, respectively. A pair of long inner holes 116A and 116B is formed between the outer holes 114A and 114D, and these inner holes 116A and 116B are formed to accommodate the inner wall members 106A and 106B of the jig 100, respectively. do. These outer and inner holes 114A-114D; 116A, 116B allow insertion and sliding of corresponding outer and inner wall members 104A-104D; 106A, 106B, but these outer and inner wall members 104A-104D; 106A, 106B. It is preferable to have substantially the same diameter as the outer wall and inner wall members 104A-104D (106A, 106B) so as not to allow the flow.

3 is a perspective view showing the assembled state of the jig assembly according to a preferred embodiment of the present invention. Referring to FIG. 3, the jig 100 works with its outer wall members 104A-104D and inner wall members 106A, 106B inserted into corresponding outer and inner holes 114A-114D; 116A, 116B, respectively. It is disposed on the table 160 to form the jig assembly of the present invention.

4 is a cross-sectional view illustrating a state in which the piezoelectric element 150 is seated on the jig assembly of the present invention of FIG. 3. Referring to FIG. 4 together with FIGS. 2 and 3, when the piezoelectric element 150 is seated on the jig 100 of FIG. 3, the front edge 150A of the piezoelectric element 150 may have a front outer wall member as shown in FIG. 4. Supported by 104A, the left edge 150B (see FIG. 2) and the right edge 150C are supported by the left outer wall member 104B (see FIG. 2) and the right outer wall member 104C, respectively, and the trailing edge ( 150D is supported by the trailing outer wall member 104D. At this time, the inner surface of these outer wall members 104A-104D extends upward along the contour of the attachment region 112 corresponding to the edges 150A-150D of the piezoelectric element 150, so the outer wall members 104A-104D are piezoelectric elements. Edges 150A-150D of 150 are stably gripped.

The bottom surface 154 of the piezoelectric element 150 is seated on the inner wall members 106A and 106B. At this time, as described above, the upper end of these inner wall members (106A, 106B) forms a plane parallel to the body 102, the substrate portion 110 has the same thickness, so the bottom surface 154 of the piezoelectric element 150 Is maintained at the same distance as the attachment region 112 on the upper surface of the substrate 110.

On the other hand, reference numeral 156, which has not been described, indicates an input wire of the piezoelectric element 150, and the drawing candidate 158 indicates an output wire of the piezoelectric element 150.

5 is an exploded perspective view of a jig assembly for manufacturing a piezoelectric transformer according to a second embodiment of the present invention. Referring to FIG. 5, a jig assembly for manufacturing a piezoelectric transformer according to a preferred embodiment of the present invention includes a jig 200 and a part of a substrate of a power supply circuit (not shown), that is, the substrate unit 210.

The jig 200 includes a flat body 202 of equal thickness, between eight rounded outer pillars 204A-204D and outer pillars 204A, 204D extending to a predetermined length at right angles from the edge of the body 202. A pair of rounded inner pillars 206A, 206B extending at right angles to the body 202 with a length shorter than the outer pillars 204A-204D. These inner pillars 206A, 206B are preferably formed so that their upper end forms a plane and this plane is configured parallel to the upper surface of the main body 202.

Meanwhile, a flat substrate 210 having the same thickness is shown above the jig 200, and a piezoelectric element 250 is illustrated above the substrate 210.

An attachment region 212 corresponding to the piezoelectric element 250 is formed in the substrate 210. That is, the contour of the attachment region 212 substantially coincides with the four edges 250A-250D, which are the contours of the piezoelectric element 250. Therefore, when the piezoelectric element 250 is coupled to the substrate unit 210 to form a piezoelectric transformer, the piezoelectric element 250 is positioned in the attachment region 212.

Eight round outer holes 214A-214D are formed at the edge of the attachment area 212. These outer holes 214A-214D are each formed to receive the outer pillars 204A-204D of the jig 200. A pair of round inner holes 216A, 216B are formed inside the outer holes 214A-214D, and these inner holes 216A, 216B are formed to receive the inner pillars 206A, 206B of the jig 200, respectively. do. These outer and inner holes 214A-214D; 216A, 216B allow insertion and sliding of the corresponding outer and inner columns 204A-204D; 206A, 206B, but these outer and inner columns 204A-204D; 206A, 206B It is desirable to have substantially the same diameter as the outer and inner columns 204A-204D; 206A, 206B so as not to allow flow.

Meanwhile, in the second embodiment, the jig 200 and the substrate unit 210 constitute the jig assembly in the same manner as in the first embodiment, and thus the piezoelectric element 250 is gripped and seated accordingly, so further description thereof is omitted. do.

6A and 6B are cross-sectional views illustrating a coupling process of a jig assembly according to a third exemplary embodiment of the present invention. The jig assembly according to the third embodiment has the same overall configuration as either one of the first and second jig assemblies, but only in the shape of the wall member or the pillar. For convenience, the components corresponding to the wall members or the pillars are called protrusions, and the protrusions 304 corresponding to the outer wall members or the outer pillars will be described. Of course, this shape applies equally to the projection (not shown) corresponding to an inner wall member or an inner side pillar.

6A and 6B, the protrusion 304 has a diameter where the head 308 is the same or somewhat smaller than the corresponding hole 314 of the substrate portion 310, with the portion below the head 308 having a predetermined thickness. Indented by (t). On the other hand, the bottom surface 308 of the head 308 has a predetermined height h from the top surface of the body 302, which is formed to be the same or somewhat larger than the thickness of the substrate portion (310).

When the jig 300 having such a configuration is coupled to the substrate portion 310, that is, the projection 304 is inserted into the hole 314 of the substrate portion 310 in the direction of the arrow A (FIG. 6A), and then the arrow B When the jig 300 is moved in the direction of (), the protrusion 304 moves by the gap G so that the bottom surface 308B of the head 308 is in intimate contact with the top surface of the substrate portion 310 (FIG. 6B). .

In this configuration, the jig 300 can be more firmly coupled to the substrate portion 310 than in the first and second embodiments described above.

7 is a perspective view illustrating a method of manufacturing a piezoelectric transformer using the jig assembly of the present invention, and FIG. 8 is a cross-sectional view illustrating a subsequent step of FIG. 7.

7 and 8 show the jig assembly according to the first embodiment of the present invention, but the jig assembly according to the second and third embodiments may be used equally.

First, the jig 100 according to the first embodiment of the present invention is combined with the substrate unit 110 as described with reference to FIG. 3, and then the adhesive resin is attached to the attachment region 112 of the substrate unit 110. 170 is discharged to a predetermined height using an air dispenser (not shown) (Fig. 7). The adhesive resin 170 is discharged at a predetermined point on the attachment region 110 corresponding to the node point of the piezoelectric element 150 to minimize noise, and is the same as the inner wall members 106A and 106B as seating means. Have a rather large height

An example of such an adhesive resin 170 is a silicone resin, which has a surface drying time of 5 to 15 minutes at 23 ° C., a viscosity of 30 to 90 Pa · s at 23 ° C., a hardness of 20 to 45, 1.5 It is preferred to have a tensile strength of at least MPa and a shear adhesive strength of at least 1.5 MPa.

In addition, although the node point is shown as two points in FIG. 7, this is determined according to the shape and characteristics of the piezoelectric element.

Subsequently, before the adhesive resin 170 is cured, the piezoelectric element 150 is seated on the jig 100 as described with reference to FIG. 4. The four edges of the piezoelectric element 150 are gripped by the outer wall members 104A-104D, the bottom surfaces thereof are seated on the inner wall members 106A, 106B, and the node points of the bottom surfaces are bonded with the adhesive resin 170 (FIG. 8). ).

In such a state, the adhesive resin 170 is cured for a predetermined time, and then the substrate 110 is lifted to separate the jig 100 from the substrate 110. Then, the piezoelectric element 150 and the substrate portion ( 110 and a piezoelectric transformer composed of an adhesive resin 170 for bonding them is completed.

 According to the piezoelectric transformer manufacturing jig and jig assembly of the present invention as described above, it is possible to easily produce a piezoelectric transformer having excellent piezoelectric characteristics.

In addition, the deviation between products occurring in the lead frame for fixing the piezoelectric element can be significantly improved.

In addition, the jig and jig assembly for manufacturing a piezoelectric transformer according to the present invention can be applied to the production of piezoelectric transformers of various models at a low cost.

In addition, the jig mounting hole formed in the substrate portion itself has the advantage of performing the function of a buffer that absorbs vibration and noise.

Although the above has been described with reference to the preferred embodiments of the present invention, those skilled in the art may vary the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. It will be appreciated that modifications and variations can be made.

Claims (18)

Flat body; Gripping means extending perpendicularly from the edge of the main body so as to be detachably extended through the substrate in contact with one surface of the main body, to grip the side of the flat piezoelectric element disposed opposite the main body around the substrate ; And Receiving means extending perpendicularly from the main body to a length shorter than the holding means by detachably penetrating the substrate so as to support the bottom surface of the flat piezoelectric element in parallel with the substrate Jig for piezoelectric transformer manufacturing comprising a. The jig for manufacturing a piezoelectric transformer according to claim 1, wherein the holding means includes a plurality of wall members in close contact with the piezoelectric element. The jig for manufacturing a piezoelectric transformer according to claim 1, wherein the holding means includes a plurality of pillars in close contact with the piezoelectric element. The jig for manufacturing a piezoelectric transformer according to claim 1, wherein the holding means is in close contact with the substrate. The jig for manufacturing a piezoelectric transformer according to claim 4, wherein the gripping means is indented laterally below the middle portion so as to contact the substrate from above. The jig for manufacturing a piezoelectric transformer according to claim 1, wherein the seating means includes a wall member whose upper end is parallel to the main body. The jig for manufacturing a piezoelectric transformer according to claim 1, wherein the seating means includes a plurality of pillars whose upper end forms a plane parallel to the main body. The jig for manufacturing a piezoelectric transformer according to claim 1, wherein the seating means penetrates the substrate. 10. The jig for manufacturing a piezoelectric transformer according to claim 8, wherein the seating means is recessed laterally so as to contact the substrate from above. A substrate which is a part of a power supply circuit including a piezoelectric element attaching region corresponding to the outline of a flat piezoelectric element, and comprising a plurality of first holes drilled along the periphery of the attaching region and at least one second hole drilled in the attaching region. part; And A flat body which is in surface contact with the substrate portion, and extends at a right angle from an edge of the main body through a first hole of the substrate portion so as to grip a side surface of the piezoelectric element disposed opposite the main body with respect to the substrate portion; A holding means, and a mounting means extending from the main body to a length shorter than the holding means through a second hole of the substrate portion to support the bottom surface of the piezoelectric element in parallel with the substrate. Jig assembly for piezoelectric transformer manufacturing comprising a. The jig assembly for manufacturing a piezoelectric transformer according to claim 10, wherein the gripping means includes a plurality of wall members in close contact with the piezoelectric element. The jig assembly for manufacturing a piezoelectric transformer according to claim 10, wherein the holding means includes a plurality of pillars in close contact with the piezoelectric element. The jig assembly for manufacturing a piezoelectric transformer according to claim 10, wherein the gripping means is tightly fitted into the first hole of the substrate portion. The jig assembly for manufacturing a piezoelectric transformer according to claim 13, wherein the gripping means has a middle portion extending laterally to contact the substrate portion from above. The jig assembly for manufacturing a piezoelectric transformer according to claim 10, wherein the seating means includes a wall member whose upper end is parallel to the main body. The jig assembly for manufacturing a piezoelectric transformer according to claim 10, wherein the seating means includes a plurality of pillars whose upper end forms a plane parallel to the main body. The jig assembly for manufacturing a piezoelectric transformer according to claim 10, wherein the seating means is tightly fitted into the second hole of the substrate portion. 18. The jig assembly for manufacturing a piezoelectric transformer according to claim 17, wherein said seating means extends laterally so that said middle portion is in contact with said substrate portion from above.

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