KR20020085290A - Method for manufacturing multilayer ceramic device - Google Patents

Abstract

In the present invention, in the manufacture of a multilayer ceramic device, it is possible to confirm whether or not a defect occurs due to alignment misalignment between layers during the manufacturing process, thereby making the bonding between the layers more accurate and improving the productivity due to the reduction of the defective rate. In order to provide a method for manufacturing a device, a method of manufacturing a multilayer ceramic device by laminating n sheets, the index line P _{i, j} (i is a 1 to n (n is an integer greater than or equal to 1) as the layer number, and j are 1 to m (m is an integer greater than or equal to 1) as the index line number on the sheet, respectively. And punching the index lines at the diameter positions of the holes in the index lines of the first to ith sheets to form i-1 alignment holes, and then n The sheets are stacked in order from 1 to i-th layer, and the index line Pi, j exposed outside the alignment hole of the i-th sheet and the i-1th sheet exposed through the alignment hole of the i-th sheet. The index line Pi-1, j, in which the alignment holes are not formed, is adjusted to extend in a straight line to form a multilayer ceramic substrate, thereby reducing a defective rate.

Description

Manufacturing method of multilayer ceramic device {METHOD FOR MANUFACTURING MULTILAYER CERAMIC DEVICE}

The present invention relates to a method of manufacturing a multilayer ceramic device manufactured by stacking a plurality of sheets in sequence, and more particularly, it is possible to confirm whether or not a defect occurs due to a misalignment between upper and lower sheets stacked during the manufacturing process. The present invention relates to a method for manufacturing a multilayer ceramic device capable of more accurately pattern coupling between upper and lower sheets.

Ceramic devices are manufactured in a bulk form, that is, in the form of a united form using a press, or assembling or printing each pattern on several sheets, and stacking each sheet on which the pattern is printed.

In the above method, the manufacture of a ceramic device using the lamination technique divides the device to be manufactured into several parts, and prints a pattern of parts of the device on two or more sheets. Then, after stacking sheets formed by printing a predetermined pattern as described above and pressing them, the patterns formed on each sheet are electrically coupled to upper and lower patterns through via holes.

That is, after separating the entire desired ceramic element into several layers, a circuit corresponding to each layer is formed by metal electrode printing on several sheets. Then, each printed sheet is laminated in order. In this case, the criterion of lamination is that the guide holes formed in the same place of each sheet are matched with the guide pins made in the stacking jig. The sheets pressed by a constant pressure in sequence are completed as an integrated element.

Fig. 1 shows a case of stacking ceramic elements by a conventional method, and prints upper and lower patterns 1c and 2c respectively designed on sheets 1a and 1b made of ceramic material. At this time, in order to increase productivity and automate the manufacturing process, a plurality of the same pattern is printed at the same time so as to manufacture a plurality of ceramic elements on one green sheet.

At this time, the guide hole (1b) is formed on the sheets (1a, 1b) in order to hold the position when the pattern (1c, 2c) is not printed in the stacking. In FIG. 1, guide holes 1b are formed at four corners of the edges of the sheets 1a and 1b where the pattern is not printed.

Therefore, the guide hole 1b is inserted into the guide pin (not shown) provided on the stacking jig to fix the position between the sheets.

The electrode patterns printed on the upper and lower sheets 1a and 2a are electrically connected to the patterns on the adjacent sheets through the via holes to have designed characteristics. In addition, when the positions of the via holes electrically connecting the electrode patterns between the upper and lower sheets, or the positions of the electrodes on the upper and lower sheets, are changed, electrical characteristic values of the corresponding device are changed, which indicates product defects.

However, the problem is that the alignment can be changed by various variables depending on the stacking of several sheets.

As described above, since the conventional method using only the guide hole cannot be confirmed during the work, the lamination sheet is cut along the index line indicating the cut portion after the lamination process, and the cross section is irradiated to align the alignment. Is checked, and at this time, if some electrodes are exposed on the cross section, it is determined that the alignment is misaligned and a problem arises in that all of the products are discarded.

The present invention has been made to solve the above-mentioned conventional problems, the object of the present invention is to determine the failure caused by the alignment misalignment between the layers during the manufacturing process in the manufacture of a multilayer ceramic device to further bond between the layers The present invention provides a method of manufacturing a multilayer ceramic device that can accurately and improve productivity due to a decrease in defective rate.

1 is a schematic view showing the structure of each layer of a conventional multilayer ceramic device.

2A to 2D are sheet structure diagrams showing the structure of each layer of a multilayer ceramic device manufactured according to an embodiment of the present invention.

3A to 3D are sheet structure diagrams for each layer structure of a multilayer ceramic device manufactured according to another embodiment of the present invention.

4 is a cross-sectional view showing a completed state of a multilayer ceramic device manufactured according to the embodiment illustrated in FIGS. 2A to 2D.

5 is a cross-sectional view showing a completed state of a multilayer ceramic device manufactured according to the embodiment shown in FIGS. 3A to 3C.

The present invention provides a method for producing a multilayer ceramic device by laminating n sheets as a structural means for achieving the above object,

Index line P _{i, j} indicating the cutting position between the patterns on the sheets to be laminated (i is 1 to n (n is an integer of 1 or more) as the layer number of the sheet, and j is 1 to 1 as the number of index lines on the sheet. sequentially displaying m (m is an integer of 1 or more) in the periphery of the pattern on the plurality of sheets, respectively;

Punching the index lines on the index lines of the first to ith sheets so that the index lines are located at the diameter positions of the holes to form as many as i-1 alignment holes;

Stacking the n sheets in order from 1 to i-th layer; And

The index line Pi, j exposed outside the alignment hole of the i-th sheet and the index line Pi-1 where the alignment hole of the i-th sheet exposed through the alignment hole of the i-th sheet is not formed and adjusting j to extend in a straight line.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the method for manufacturing a multilayer ceramic device according to the present invention.

FIG. 2 schematically illustrates a structure of each layer sheet for explaining a manufacturing process of a multilayer ceramic device according to a first embodiment of the present invention. FIG. 2A illustrates a first sheet 21 stacked on the lowest layer. 2B shows a second sheet 22 stacked second, and FIG. 2C shows a second sheet 23 stacked third. 2D shows the nth sheet 24 finally laminated on the uppermost layer. In the above, n is a natural number of 1 or more as the number of sheets to be laminated.

As shown in FIG. 2A, in the first embodiment of the present invention, the first sheet 21 existing on the bottom layer has an area except for the area where patterns are printed, that is, along the edge of the sheet 21. Guide holes 21b are formed at four corners, and index lines 21d indicating cutting positions between the patterns are displayed on four edges of the sheet except for areas where the patterns are printed. That is, the first sheet 21 to be laminated first has the same structure as the conventional laminated sheet.

Next, as shown in FIG. 2B, the second sheet 22 stacked on the first sheet 21 may include guide holes 22b formed at four corners, and edge portions thereof. A plurality of index lines 22d, which are displayed and indicate cut lines between patterns, and an alignment hole 22g formed on the first index line with respect to the edge of the sheet of the plurality of index lines 22d.

In addition, the third sheet 23 stacked on the second sheet 22 has a guide hole 23b formed on four corners on which the pattern on the sheet is not formed, like the sheets, and the pattern is formed. And a plurality of index lines 23d which are displayed at edges outside the area to indicate the cutting positions between the patterns, and in addition, formed by punching at the first index line position and the second index line position with respect to the sheet. 23g of alignment holes are provided.

By the above-described method, in addition to the guide hole 24b and the index line 24 in addition to the pattern area on the nth sheet 24 to be stacked on the nth layer, the reference point to the n-1th index line is removed. A plurality of alignment holes 24g formed by punching are formed.

That is, according to the stacking order, the first sheet does not have alignment holes, the second sheet punches the first index line to form one alignment hole, and the third sheet has the same index as the alignment hole formed in the second sheet. Two alignment holes are formed by punching the line and the second index line located next, and the nth sheet forms n-1 alignment holes by punching all of the 1 to n-1th index lines.

Accordingly, the n-th sheet 24 stacked on the uppermost portion is n- except for the index line 24d positioned at the end with respect to the reference position (left corner), as shown in FIG. One alignment hole 24g is formed.

As described above, if the formed first to n-th sheets are sequentially stacked, as shown in FIG. 4, the index line of the first sheet is visible in the first alignment hole, and the second sheet is formed in the second alignment hole. The index lines are visible, and in the third alignment hole, the index lines of the third sheet are visible, and in the n-1th alignment holes, the index lines of the n-1 sheets can be seen.

Therefore, when the index line is not visible through each alignment hole even during lamination, the upper and lower sheets are not properly stacked.

In the first embodiment described above, only one side (that is, the upper surface) of the laminated sheet can be confirmed whether there is a defect, and on the other side it can not be confirmed that the defect. To this end, it is possible to check the presence or absence of defects on both sides by varying the arrangement of the alignment holes.

FIG. 3 shows the structure of each layer sheet for manufacturing a multilayer ceramic device according to a second embodiment of the present invention. FIG. 3 (A) shows a first sheet 31 laminated at first, and FIG. (B) shows the second sheet 32 stacked second, and FIG. 3C shows the nth sheet 33 stacked nth.

As shown above, in the second embodiment of the present invention, an alignment hole is formed by punching index lines on sheets of each layer, wherein the stacking order n is defined based on a predetermined position (for example, one corner). According to the nth index line position, black marking is performed in a predetermined form (circle or square, irrespective of form), and then a hole for confirmation is formed by forming a hole smaller than the marking size in the mark.

That is, in the first sheet 31 to be laminated first, as shown in FIG. 3A, the guide hole 31b is formed in an area where the sheet-like pattern is not printed and is coupled to the guide pin of the stacking jig. A plurality of index lines 31d indicating cutouts of patterns printed on the sheet, a plurality of alignment holes 31f formed by punching on the index lines, and a first index line on one edge A confirmation hole 31e having a smaller size than the alignment hole 31f positioned at and marked in black is formed.

As shown in FIG. 3B, the second sheet 32 to be stacked is formed on the second index line at the reference position to form a confirmation hole 32e marked with black at its periphery. An alignment hole 32f larger than the identification hole 32e is formed in the remaining index lines except for the second index line.

In the same manner, the third sheet 33 stacked in the third manner forms a confirmation hole 33e having its periphery marked black on the third index line at the reference position, and on the remaining index lines except for the third index line. An alignment hole 33f larger than the identification hole 33e is formed.

In the above, marking black around the identification hole 33e is to make the identification hole 33e more visible. In this figure, the sheet is drawn to have a predetermined thickness, but the sheet is practically no thickness, and the black mark is reflected on the back side. After all, if the black mark appears in its original form, it is judged to be normal, and if a part of the black mark is visible, it can be judged as defective.

Thus, as shown in FIG. 5, the stacked sheets are formed with holes at the top of the first index line position except for the first sheet stacked at the bottom, and the second stacked sheets at the second index line position. Holes are formed in the upper and lower parts except the two sheets, and holes are formed in the upper and lower parts of the third stacked third sheet at the third index line position, and when viewed from the upper side, it is judged whether or not there is a black mark. In the lower side, it is possible to determine whether the black marking or the confirmation hole is seen correctly by determining whether there is a defect.

As described above, by forming alignment holes in the same positions for each sheet of the multilayer ceramic device, the present invention can confirm whether the lamination is properly performed even during manufacture, and in addition, problems such as positional distortion due to poor stacking have occurred. In this case, by immediately discarding the sheets, there is an excellent effect that can reduce the occurrence of defective rate, reduce productivity and unnecessary waste. In addition, the present invention has an excellent effect of identifying defects in both directions of the multilayer ceramic element by forming a confirmation hole, which is marked in black and smaller than the alignment hole, in different positions for each layer in addition to the alignment hole. .

Claims (5)

In a method of manufacturing a multilayer ceramic device by laminating n sheets, Index line P _{i, j} indicating the cutting position between the patterns on the sheets to be laminated (i is 1 to n (n is an integer of 1 or more) as the layer number of the sheet, and j is 1 to 1 as the number of index lines on the sheet. sequentially displaying m (m is an integer of 1 or more) in the periphery of the pattern on the plurality of sheets, respectively; Punching the index lines on the index lines of the first to ith sheets so that the index lines are located at the diameter positions of the holes to form as many as i-1 alignment holes; Stacking the n sheets in order from 1 to i-th layer; And The index line Pi, j exposed outside the alignment hole of the i-th sheet and the index line Pi-1 where the alignment hole of the i-th sheet exposed through the alignment hole of the i-th sheet is not formed and controlling the j to extend in a straight line. The method of claim 1, wherein the forming of the alignment hole is performed by sequentially punching the index lines P ₁ and ₁ to the index lines P n and m. The method of claim 1, wherein the forming of the alignment hole comprises forming an alignment hole having a diameter smaller than that of the index line. In a method of manufacturing a multilayer ceramic device by laminating n sheets, Index line Pi, j (i is 1 to n (n is an integer greater than or equal to 1) as the layer number of the sheet, and j is 1 to m as the number of the index line on the sheet. (m is an integer of 1 or more) sequentially displayed on each of the periphery of the pattern on the plurality of sheets; Punching all the index lines except the i-th index line Pi, i in the i-th sheet; And Forming a colored marking on the i-th index line Pi, i in a predetermined form in the i-th sheet, After laminating one or more sheets, the method of manufacturing a multilayer ceramic device, characterized in that whether the alignment is defective by checking the marking through alignment holes on the upper and lower sides of the sheet. The method of claim 4, wherein forming the alignment hole A method of manufacturing a multilayer ceramic device, characterized in that for each i-th sheet, markings are formed on the i-th index line Pi, i in a colored manner, and then holes smaller than alignment holes are formed in the markings.