JP2004063766A - Method of manufacturing multilayer ceramic electronic component and method of gravure printing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a multilayer ceramic electronic component which includes a process that permits high precision printing without any printing skewness when printing a conductive paste or a ceramic paste for eliminating a level difference by gravure printing. <P>SOLUTION: A first gravure printing process is to print the conductive paste or the ceramic paste for eliminating a level difference on a ceramic green sheet, and a second gravure printing process is to print the ceramic paste for eliminating a level difference or the conductive paste in a second region except for the first region on the ceramic green sheet by gravure printing. The first and the second gravure printing processes are repeated to obtain a laminate. In the first and the second gravure printing processes, a plurality of first printing marks and second printing marks are printed, respectively. After the second gravure printing, the deviations between the first printing marks and the second printing marks are detected. Printing conditions are so corrected as to cancel the deviations for the next second printing process onward. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a multilayer ceramic electronic component such as a multilayer capacitor and a gravure printing method. More specifically, the present invention relates to a multilayer ceramic electronic having an improved process for printing a conductive paste and a ceramic green sheet using a gravure printing method. The present invention relates to a part manufacturing method and a gravure printing method.
[0002]
[Prior art]
For example, when manufacturing a multilayer ceramic capacitor, a method of gravure printing a ceramic paste and a conductive paste on a ceramic green sheet supported by a support film is known.
[0003]
Japanese Patent Laid-Open No. 8-250370 discloses a method of manufacturing a multilayer ceramic capacitor in which a plurality of internal electrode patterns are gravure-printed by a first gravure roll on a dielectric grease sheet formed on a long support film. Further, there is disclosed a technique in which a step-resolving dielectric pattern is gravure-printed between the patterns by a second gravure roll.
[0004]
As described above, when performing gravure printing on the long dielectric green sheet with the gravure roll for the internal electrode pattern and the step eliminating dielectric pattern, the width direction of the dielectric green sheet (dielectric green sheet A positional shift may occur in a direction perpendicular to the transport direction.
[0005]
Such misalignment in the width direction is caused when the internal electrode pattern and the step elimination dielectric pattern are printed on the dielectric grease sheet as described above. They overlap each other, or the gap between the two is excessively open, so that they cannot be formed at a desired position.
[0006]
Therefore, conventionally, the correction of the deviation in the width direction is performed by moving the second gravure roll in its axial direction, that is, in the width direction of the long dielectric grease sheet before the second gravure printing step. It was done.
[0007]
[Problems to be solved by the invention]
Therefore, as shown in FIG. 21, depending on the movement timing of the gravure roll, a distorted level difference eliminating dielectric pattern 101b must be generated. In FIG. 21, reference numeral 102 denotes a long dielectric grease sheet, the support film transport direction is the arrow A direction, the printing direction is the arrow B direction, and the position where the gravure roll is moved is the arrow C. The print patterns 101a, 101b, and 101c are each printed by one rotation of the gravure roll.
[0008]
Further, there is a problem that the coating thickness of the step eliminating dielectric pattern 101b varies depending on the movement timing of the gravure roll.
When the printing distortion of the dielectric pattern for level difference and the variation in coating thickness occur as described above, the level difference with the internal electrode pattern, which is the original purpose of the level-resolving dielectric pattern, cannot be eliminated. There was a problem that structural defects of the body would occur.
[0009]
In addition to the method of printing the conductive paste and step-removing ceramic paste in the production of the above multilayer ceramic capacitor by gravure printing, the multi-color gravure printing method similarly causes printing misalignment and multi-color printing with high accuracy. There is a problem that it is difficult to perform printing.
[0010]
An object of the present invention is to provide a method for manufacturing a multilayer ceramic electronic component including a step of gravure printing a conductive paste or a step-resolving ceramic paste on a sheet in view of the current state of the prior art described above. Can be performed with high precision, printing distortion of the ceramic paste for eliminating the step or conductive paste is difficult to occur, and the manufacturing method of multilayer ceramic electronic parts, and when performing multi-color printing, correct the deviation of gravure printing of each color with high precision It is an object of the present invention to provide a gravure printing method that can prevent printing distortion.
[0011]
[Means for Solving the Problems]
The method for producing a multilayer ceramic electronic component according to the present invention includes a step of preparing a long composite sheet in which a ceramic green sheet is formed on a support film, and a first region in a printing region on the ceramic green sheet. A first gravure printing step of printing a conductive paste or a step eliminating ceramic paste on the ceramic green sheet by a gravure printing method, and a step eliminating ceramic paste or conductive paste by a gravure printing method on a second region in the printing region on the ceramic green sheet A second gravure printing step of printing a plurality of print marks outside the print region in the first gravure printing step, and a plurality of second print marks outside the print region in the second gravure printing step. Is printed, and after the second gravure printing step, the first print mark and the second print mark The second gravure printing process from the next time is performed so as to eliminate the required deviation amount, and a composite green sheet composed of the ceramic green sheet, the conductive paste, and the step-resolving ceramic paste is laminated. And a step of obtaining a laminate by repeating the step a plurality of times.
[0012]
In a specific aspect of the method for manufacturing a multilayer ceramic electronic component according to the present invention, in detecting a shift between the plurality of first print marks and the plurality of second print marks, a shift along a ceramic green sheet conveyance direction is performed. The amount of deviation in the twist direction, which is the angle between the amount, the amount of deviation in the direction perpendicular to the ceramic green sheet conveyance direction, the direction connecting the plurality of first print marks, and the direction connecting the plurality of second print marks Are detected.
[0013]
In another specific aspect of the method for manufacturing a multilayer ceramic electronic component according to the present invention, the plurality of first print marks and the plurality of second print marks are respectively relatively large print marks and relatively small. And a print mark. In this case, a large printing deviation can be detected quickly using a relatively large printing mark, and then a small printing deviation is detected using a small printing mark, thereby correcting the printing deviation with high accuracy. be able to.
[0014]
The relatively large print mark is preferably arranged in front of the print direction relative to the relatively small print mark. Therefore, it is possible to detect a coarse print misalignment using a relatively large print mark arranged in the front, and then detect a minute print misalignment using a relatively small print mark arranged in the rear. can do.
[0015]
In still another specific aspect of the method for manufacturing a multilayer ceramic electronic component according to the present invention, in performing the second gravure printing step so as to eliminate the deviation amount, the timing of conveying the ceramic green sheet and the conveying direction; The position of the ceramic green sheet in the orthogonal direction is adjusted. That is, the second gravure printing process can be performed with high accuracy by adjusting the timing of conveying the ceramic green sheet and the position of the ceramic green sheet in the direction orthogonal to the conveying direction.
[0016]
In still another specific aspect of the method for manufacturing a multilayer ceramic electronic component according to the present invention, in performing the second gravure printing step so as to eliminate the deviation amount, the gravure roll is transported in the axial direction and the ceramic green sheet. The angle made with the direction is adjusted. In this case, in the second gravure printing step, the printing misalignment in the twist direction is eliminated by adjusting the angle between the axial direction of the gravure roll and the conveying direction of the ceramic green sheet.
[0017]
In still another specific aspect of the method for producing a multilayer ceramic electronic component according to the present invention, in the step of laminating the mother ceramic green sheet, a third plurality of printed marks is formed on the solid mother ceramic green sheet after lamination. Is detected, and the shift of the first print mark applied in the first gravure printing step for obtaining the next composite green sheet is detected on the basis of the plurality of third print marks, whereby the first gravure is detected. The first gravure printing process is performed so as to correct the printing deviation in the printing process. Therefore, the next first gravure printing process can be carried out accurately on the plain mother ceramic green sheet.
[0018]
In still another specific aspect of the method for producing a multilayer ceramic electronic component according to the present invention, the step of obtaining the laminate includes a step of further laminating a plain ceramic green sheet on the composite green sheet on the support film. The method further includes a step of repeating the process.
[0019]
In still another specific aspect of the method for producing a multilayer ceramic electronic component according to the present invention, a step of forming a multilayer green sheet on the support film and obtaining the multilayer body includes the step of obtaining the multilayer green This is performed by repeating the process of laminating the sheets a plurality of times.
[0020]
According to another broad aspect of the present invention, a gravure printing method in which a plurality of gravure printing steps are performed in order to perform multicolor printing, and in each gravure printing step, a plurality of print marks are printed, A step of detecting a shift amount of a plurality of print marks currently printed with respect to a plurality of print marks printed, and a next gravure printing step is performed so as to correct the gravure printing step according to the detected shift amount. A gravure printing method comprising the steps of:
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be clarified by describing specific examples of the present invention.
[0022]
FIG. 4 is a schematic configuration diagram of an apparatus for explaining a method of manufacturing a multilayer ceramic electronic component according to an embodiment of the present invention.
In the multilayer ceramic electronic component manufacturing apparatus 1, a long composite sheet 2 in which a ceramic green sheet is formed on a support film made of a synthetic resin such as polyethylene terephthalate, polypropylene, or polyethylene naphthalate is indicated by an arrow D shown in the figure. Supplied as This apparatus has first and second gravure printing units 3 and 4, and printing is performed on one surface of the composite sheet 2 in each.
[0023]
The first gravure printing unit 3 includes a first gravure roll 5 and a first pressure contact roll 6. As shown in FIG. 5, the gravure roll 5 has a cylindrical shape, and the outer peripheral surface 5a is provided with a plurality of printing portions 7a along the circumferential direction. In the printing unit 7a, a plurality of rectangular recesses (printed figures) are provided in a matrix in order to print the conductive paste serving as an internal electrode in the first region on the composite sheet 2. A plurality of cells (dents) partitioned by a grid-like bank are provided in the recess. The shape of the recess is matched to the internal electrode shape required for the multilayer ceramic electronic component, and is not limited to the rectangular shape.
[0024]
Further, in order to print a plurality of first print marks for correcting a positional deviation of the composite sheet 2 described later on the outer peripheral surface of the first gravure roll 5 as well as the first printing unit 7a. First print mark printing sections 7c and 7d are provided. Further, a printing unit 7e for printing a trigger sensor mark to be described later is provided.
[0025]
In FIG. 5, the print mark printing sections 7c and 7d for printing a plurality of first print marks are configured to have a circular shape. In addition, the printing unit 7 e for printing the trigger sensor mark has a rectangular shape having a longitudinal direction in the axial direction of the gravure roll 5.
[0026]
The composite sheet 2 is sandwiched between the gravure roll 5 and the pressure contact roll 6 of the first gravure printing unit 3, and a conductive paste applying means (not shown) provided in the vicinity of the gravure roll 5 in the concave portion of the printing unit 7 a. The conductive paste is filled and transferred to the composite sheet 2 for gravure printing. As the conductive paste, a mixture of conductive powder made of Ag, Ag-Pd, Ni, Cu, Au, or the like and an organic vehicle is used.
[0027]
In the first gravure printing unit 3, rollers 8 a to 8 e are arranged to supply the composite sheet 2 between the gravure roll 5 and the press contact roll 6. In addition, a roller 8f is disposed at the subsequent stage of the gravure roll 5, and the printed composite sheet 2 is conveyed to the first drying device 9 via the roller 8f. The drying device 9 includes an appropriate heater and is provided for transporting the printed conductive paste.
[0028]
Rollers 10 a and 10 b are disposed on the downstream side of the drying device 9, and after the conductive paste is dried, the composite sheet 2 is supplied to the second gravure printing unit 4.
In the second gravure printing unit 4, a second gravure roll 11 and a second press-contact roll 12 are arranged.
[0029]
The second gravure roll 11 is configured in substantially the same manner except that the first gravure roll 5 is different in the shape of the printing part. In other words, the second gravure roll 11 is provided with a plurality of printing portions having a shape for printing the step-resolving ceramic paste on the second region where the conductive paste on the composite sheet 2 is not printed.
[0030]
Also in the second gravure roll, a printing unit for printing marks for printing a plurality of second printing marks for correcting printing misalignment on the side of the printing unit, as in the case of the first gravure roll 5. Is provided.
[0031]
The composite sheet 2 on which the conductive paste is printed is sandwiched between the gravure roll 11 and the pressure contact roll 12 of the second gravure printing unit 4, and the ceramic paste for level difference elimination is transferred to the second region of the composite sheet 2, Gravure printing is performed. In this way, a composite green sheet composed of the ceramic green sheet, the conductive paste, and the step-resolving ceramic paste is formed.
[0032]
The step-resolving ceramic paste is a mixture of ceramic powder such as dielectric ceramics, magnetic ceramics, or glass ceramics and an organic vehicle.
[0033]
In order to supply the composite sheet 2 between the gravure roll 11 and the press-contact roll 12, rollers 13a to 13e are arranged. A second drying device 14 is disposed behind the gravure roll 11 via a roller 13f.
[0034]
Rollers 15a and 15b are arranged downstream of the second drying device 14, and the composite sheet 2 printed by the first and second gravure printing units 3 and 4 is discharged along the direction of arrow E. Is done.
[0035]
The feature of the present embodiment is that when the first and second gravure printing steps are performed by the first and second gravure rolls 5 and 11, printing deviation of the step-resolving ceramic paste in the second gravure printing step is detected. The misregistration is to be corrected. This will be described with reference to FIGS.
[0036]
FIG. 1 shows a composite green sheet 2 having a long ceramic green sheet formed on a support film in a first gravure printing process. It is a typical partial notch top view which shows the state by which the electrically conductive paste was printed according to the electrode shape. An arrow D indicates the conveyance direction of the composite sheet. The conductive paste is printed in the print area F. At the same time, a plurality of first print marks 21 a and 21 b and a trigger sensor mark 22 are printed on the side of the print area F.
[0037]
On the other hand, FIG. 2 is a schematic partially cutaway plan view showing a state after the second gravure printing step. In the second gravure printing step, the step-resolving ceramic paste is printed in the second region where the conductive paste printed in the first gravure printing step is not printed. However, it is actually very difficult to print the second gravure printing process so as not to cause a printing shift after the first gravure printing process. Therefore, as shown in FIG. 2, the printing area F ′ in the second gravure printing process tends to be shifted from the printing area F in the first gravure printing process. Although schematically shown in FIG. 2, the step-resolving ceramic paste is printed in the printing region F ′. A plurality of second print marks 23a and 23b are printed on the side of the print area F ′.
[0038]
The feature of the present embodiment is that after the second gravure printing step, a plurality of print marks 21a and 21b printed in the first gravure printing step and a plurality of second prints printed in the second gravure printing step The amount of deviation between the marks 23a and 23b is detected, and the printing conditions in the second and subsequent second gravure printing steps are adjusted according to the amount of deviation.
[0039]
The plurality of print marks 21a, 21b and 23a, 23b are printed so as to have a predetermined positional relationship with respect to the print areas F, F ′. That is, the printing parts of the first and second gravure rolls are configured so that the print marks 21a, 21b, 23a, and 23b are printed in such a relationship.
[0040]
Detection of the positional deviation amount of the second gravure printing marks 23a and 23b with respect to the first gravure printing marks 21a and 21b can be performed using a camera and an image processing apparatus, and the second gravure printing process is performed according to the deviation amount. The printing conditions may be corrected. For example, when the second print marks 23a and 23b are shifted from the first print marks 21a and 21b in the printing direction, that is, the conveyance direction of the composite sheet 2, the second gravure roll is used in the second gravure printing step. The timing at which the composite sheet 2 is pressed into contact with each other may be shifted. Further, when the second print marks 23a and 23b are shifted from the first print marks 21a and 21b in the direction orthogonal to the conveyance direction of the composite sheet 2, the gravure roll 11 is moved in the axial direction. And correct it.
[0041]
Furthermore, the present embodiment is characterized by the fact that a plurality of first print marks 21a, 21b and a plurality of second print marks 23a, 23b are provided, so that the aforementioned displacement in the twisting direction is also detected. And misalignment in the torsional direction can be corrected. FIG. 2 shows a case where such a displacement in the twist direction occurs. In this case, the direction X1 connecting the plurality of print marks 21a and 21b and the direction X2 connecting the plurality of second print marks 23a and 23b intersect at an angle θ. Accordingly, the axial direction of the second gravure roll 11 may be inclined by an angle θ from the direction orthogonal to the transport direction D so that the angle θ is zero.
[0042]
FIG. 3 is a partially cutaway front view schematically showing an example of means for correcting the twist direction. As shown in FIG. 3, the 2nd gravure roll 11 is comprised so that it can rotate by the drive source which is not shown in figure around the axis | shaft 11b. As shown in FIG. 3, driving means 46 a and 46 b made of, for example, a positioning motor are disposed on the shaft 11 b on both outer sides in the axial direction of the gravure roll 11. By driving the driving means 46a and 46b, the shaft 11a and thus the gravure roll 11 can be moved in the directions of arrows Y and -Y in FIG. Therefore, by varying the driving amounts of the positioning motors 46a and 46b, the axial direction of the gravure roll 11 can be shifted by an angle θ from the direction orthogonal to the conveying direction of the ceramic green sheet.
[0043]
According to the present embodiment, as described above, since a plurality of first print marks and second print marks are provided, it is possible to correct a displacement in the twist direction.
[0044]
After the positional deviation in the second gravure printing process is corrected as described above, the first gravure printing process is performed on the long composite sheet 2, and then the second gravure printing process is performed according to the correction result. Done. In this way, a composite green sheet in which the step-resolving ceramic paste is printed around the conductive paste on the ceramic green sheet can be formed with high accuracy.
[0045]
FIG. 6 is a partially cutaway cross-sectional view showing a state in which two layers of composite green sheets 27 are laminated on the support film 2 by performing the first and second gravure printing processes. In order to achieve such a configuration, after forming the first composite green sheet on the support film 2, a plain ceramic green sheet is formed thereon, and the first and second gravure are further formed thereon. What is necessary is just to form the 2nd layer composite green sheet by printing.
[0046]
In addition, in the said embodiment, although the composite green sheet 27 of 2 layers is laminated | stacked, you may laminate | stack several layers, for example, 3-5 layers.
In forming a plain ceramic green sheet, a plain ceramic green sheet may be formed on the first composite green sheet by a coating device such as a die coater, or a plain ceramic green sheet is prepared in advance. The sheet may be thermocompression bonded to the first composite green sheet. A plain ceramic green sheet is formed on the entire surface of the support film.
[0047]
Alternatively, the first and second gravure printing steps may be performed after a plurality of layers of plain ceramic green sheets are laminated. By overlapping the plain ceramic green sheets, insulation failure due to pinholes generated in the ceramic green sheets is prevented. In addition, there is a multilayer ceramic electronic component whose characteristics are improved by forming an intermediate layer in which no internal electrode is formed.
[0048]
Moreover, you may perform the following lamination process on the solid ceramic green sheet of the uppermost layer on a support film, without performing the 1st, 2nd gravure printing process. In that case, since the plain ceramic green sheet of the uppermost layer of the composite green sheet already laminated and the ceramic green sheet of the lowermost layer of the composite green sheet to be laminated next are stacked, Insulation failure due to holes can be prevented.
[0049]
Thereafter, only the laminated body is cut into a rectangular shape on the support film using a cutting head (not shown) and peeled off from the support film. Then, the laminate is transported to a laminate stage (not shown) by a cutting head and is temporarily pressure-bonded to the already placed laminate. By repeating this sequentially, a laminate having a desired number of layers is formed.
[0050]
In addition, you may arrange | position a plain ceramic green sheet in the upper and lower outer layers of a laminated body as needed (depending on the kind of laminated ceramic electronic component). The plain ceramic green sheet for the outer layer may be formed in a rectangular shape from a long green sheet, or a green sheet that has been rectangular in advance may be used.
[0051]
Thereafter, the laminate is fully pressed in the thickness direction.
The mother laminate thus obtained is schematically shown in FIG. In the mother laminate 31, a plurality of conductive pastes 32 are arranged so as to overlap each other with a ceramic layer interposed therebetween. Next, the mother multilayer body 31 is cut in the thickness direction so as to obtain a multilayer body of individual multilayer ceramic capacitor units. Thereby, a laminate 33 schematically shown in FIG. 7B is obtained. By firing this laminated body 33, a ceramic sintered body 34 shown in FIG. 9 is obtained. External electrodes 35 and 36 are formed so as to cover the end faces 34 a and 34 b of the ceramic sintered body 34. In this way, a multilayer ceramic capacitor 36 as a multilayer ceramic electronic component is obtained.
[0052]
Next, with reference to FIGS. 9-18 (a) and (b), the manufacturing method of the multilayer ceramic capacitor of the 2nd Example of this invention is demonstrated. In the second embodiment, the first and second gravure printing steps are performed in the same manner as in the first embodiment, and further, the conductive paste is printed after the plain mother ceramic green sheets are laminated. The positional deviation is also corrected in the first gravure printing step. Therefore, all composite green sheets can be formed with high accuracy in obtaining a mother laminate.
[0053]
FIG. 9 is a block diagram showing a control device including a circuit for detecting the printing deviation and a circuit for correcting printing conditions in accordance with the detected printing deviation. As shown in FIG. 9, a plurality of first print marks and second print marks are photographed by the print mark photographing cameras 41 and 42. Reference numeral 43 denotes a trigger sensor, which detects the trigger sensor mark 22 described above.
[0054]
The cameras 41 and 42 are connected to the image processing device 44. In addition, a light source 45 for irradiating the ceramic green sheet with light is disposed for photographing. The light source 45 is constituted by, for example, a strobe light source device.
[0055]
The trigger sensor 43 is composed of, for example, a photoelectric switch. When the trigger sensor mark 22 is detected, a signal indicating the detection mode is given to one input terminal of the AND gate 46. The other input terminal of the AND gate 46 is connected to the controller 51.
[0056]
The controller 51 includes a data processing unit 52, a host communication unit 53, an angle and speed detection unit 54, and positional deviation correction units 55a and 55b. The angle detection unit 54 of the controller 51 gives a “high” signal to the AND gate 46 when it is theoretically at the trigger sensor mark detection position. A signal indicating that the trigger sensor mark is detected from the trigger sensor is input to the AND gate 46 as a “high” signal. Accordingly, the AND gate generates an ON-state signal, and as a result, the strobe light source device of the light source 45 irradiates the ceramic green sheet with light. At this time, the first and second print marks are photographed by the camera, the photographed data is given to the image processing device, and the data binarized by the image processing device is given to the data processing unit 52 of the controller 51. It is done. The controller 51 is connected to an image monitor 58 as an output device, and is configured so that the photographed data can be viewed with the image monitor 58.
[0057]
In addition, the controller 51 causes the data processing unit 52 to process the shooting data of the first and second print marks given from the image processing device 44, and the positional deviation amount of the second print mark with respect to the first print mark. Is calculated. Output signals are provided to the motors 62 and 63 from the positioning correction units 55a and 55b in accordance with the positional deviation amounts thus obtained. The motors 62 and 63 are configured to change the axial position of the second gravure roll 11 and the direction position orthogonal to the axial direction.
[0058]
Accordingly, the motors 62 and 63 are driven by the controller 51 in accordance with the amount of positional deviation, and the axial position of the gravure roll 11, that is, the position perpendicular to the ceramic green sheet conveyance direction and the position along the printing direction are adjusted. Will be. In addition, as described above, when the displacement in the twist direction occurs, the positioning motors 64a and 64b are driven by the positioning correction portions 56a and 56b, and the displacement in the twist direction is corrected.
[0059]
The angle and speed detection unit 54 is connected to the gravure roll encoder 65. The gravure roll encoder 65 gives a signal representing the angular position and rotational speed of the gravure roll, and an angle and speed detector 54. The angle and speed detection unit 54 gives a “high” signal to the AND gate 46 when the gravure roll is rotated at a stable speed and is at a set angular position.
[0060]
In the second embodiment, the same manufacturing apparatus as in the first embodiment is used. Therefore, for the description of the manufacturing apparatus, the description of the first embodiment is used, and mainly different parts are described below. I will explain.
[0061]
In the second embodiment, the first gravure printing step is performed in the same manner as in the first embodiment. That is, as shown in FIG. 10, in the first gravure printing process, the conductive paste is printed in the printing region F, and the plurality of first print marks 21a and 21b and the trigger sensor mark 22 are the same conductive paste. Printed. Here, the plurality of print marks 21a and 21b are configured to have a relatively large print mark 21a located in front of the print direction and a relatively small print mark 21b located behind the print area. .
[0062]
Next, a second gravure printing step is performed. In this case, in the second gravure printing step, the step eliminating ceramic paste is printed as in the first embodiment, but a plurality of second print marks are simultaneously printed with the same ceramic paste. As shown in FIG. 11A, in addition to the first print marks 21a and 21b and the trigger sensor mark 22, second gravure print marks 23a and 23b are printed. The plurality of second print marks 22a and 22b also have a relatively large print mark 23a and a relatively small print mark 23b, similarly to the plurality of first print marks 21a and 21b.
[0063]
In the second embodiment, as described above, both the first and second print marks have relatively large print marks 21a and 23a and relatively small print marks 21b and 23b. Therefore, as shown in FIG. 11B, when the print marks are photographed by the cameras 41 and 42 described above, relatively large print marks 21a and 23a positioned in front of the print direction are made larger by using the camera 41. You can shoot quickly in the field of view. Further, with such relatively large print marks 21a and 23a, as shown in FIG. 12, the displacement amounts Z1 and Z2 in the printing direction and the direction orthogonal to the printing direction can be quickly measured. Then, the positional deviation is corrected roughly according to the positional deviation amounts Z1 and Z2.
[0064]
Next, using the camera 42, as shown in FIG. 13, relatively small first and second print marks 21b and 23b can be taken quickly with a narrower field of view. As shown in FIG. 13, by capturing relatively small print marks 21b and 23b, accurate shift amounts Z1 'and Z2' in the direction perpendicular to the print direction and the print direction can be easily obtained. Based on the result, the misalignment is corrected with higher accuracy.
[0065]
That is, as shown in FIG. 14, by arranging the coarse alignment camera 41 and the high-accuracy alignment camera 42 relatively forward and backward in the printing direction, a plurality of first and second different sizes are provided. By using the print marks 21a, 23a, 21b, and 23b, it is possible to easily correct the positional deviation with high accuracy.
[0066]
In this way, the positional deviation amount in the second gravure printing process is corrected, and the second gravure printing process is performed again according to the correction result.
By the way, when the second gravure printing step is performed and the composite green sheet is dried, the second print marks 23a and 23b made of the ceramic material are assimilated with the ceramic green sheet as a base after drying, and as shown in FIG. In addition, the second print marks 23a and 23b provided at the side positions of the first print marks 21a and 21b are difficult to observe from the upper surface side (note that the first print marks 21a and 21b are made of an electrode material). So it is easy to detect optical differences). By utilizing this, print marks 72a and 72b for the third color, which will be described later, are provided so as to be superimposed at substantially the same position as the second print mark. Note that the second print marks 23a and 23b cannot be observed at all. For example, image processing is possible depending on the amount of reflected light and the amount of transmitted light depending on the presence or absence of the print mark. In that case, it is preferable that the print marks 72a and 72b for the third color do not overlap the second print mark.
[0067]
Next, a plain mother ceramic green sheet is thermocompression bonded onto the composite green sheet. FIGS. 16A and 16B are a partially cutaway plan view showing a state after the thermocompression bonding of the plain mother ceramic green sheet 71 and a schematic plan view showing the enlarged state. The thickness of the solid mother ceramic green sheet 71 is as thin as about several μm. Therefore, in a state where the mother green sheet is thermocompression bonded, the plurality of first print marks 21a and 21b and the trigger sensor mark 22 printed in the first gravure printing process are shown on the upper surface through the mother ceramic green sheet 71. Can be detected from the side.
[0068]
Thereafter, the first gravure printing process is performed again as the third color. FIGS. 17A and 17B are a partial cutaway plan view showing a result of performing the third color printing and the first gravure printing process again, and a plan view showing an enlarged main part thereof.
[0069]
In the third color printing, that is, the second first gravure printing process, the print marks 72a and 72b and the trigger sensor mark 73 are printed together with the conductive paste. However, here, the print marks 72a and 72b and the trigger sensor mark 73 are not only the side positions of the first print marks 21a and 21b and the trigger sensor mark 22 printed by the first color printing, but also the print marks. It is also printed behind the area where 21a, 21b and the trigger sensor mark 22 are provided.
[0070]
When the first gravure printing process is performed again, printing is performed in the first gravure printing process of the plurality of first print marks 21a and 21b and the trigger sensor mark 22 printed in the first gravure printing process. The printed print marks 72a and 72b and the trigger sensor mark 73 can be detected.
[0071]
That is, the amount of positional deviation can be detected in the same manner as described above by photographing the areas surrounded by the broken lines G1 and G2 in FIG. Therefore, in the third color printing, that is, the second first gravure printing process, the first print marks 21a and 21b after correction by the previous first gravure printing process and second gravure printing process are used as a reference. The amount of displacement of the print marks 72a and 72b can be detected. Therefore, the first gravure printing process may be performed by setting the printing conditions again in accordance with the positional deviation amount.
[0072]
Next, a second gravure printing process is performed again as the fourth color gravure printing. When the second gravure printing step is performed, as shown in FIGS. 18A and 18B, the step-resolving ceramic paste is printed and the second plurality of second print marks 82a and 82b are printed. The The second print marks 82a and 82b are printed behind the first color print marks 21a and 21b in the printing direction. That is, the print marks 72a and 72b printed in the area indicated by the arrow H in FIG.
[0073]
Accordingly, the amount of displacement of the second gravure printing marks 82a and 82b printed during the printing of the fourth color with respect to the first printing marks 72a and 72b printed in the first gravure printing process of the third color is detected in the same manner as described above. Correct.
[0074]
In this case, preferably, as described above, the positions of the plurality of first print marks 82a and 82b of the fourth color do not overlap with the positions of the first print marks 21a and 21b in the conveyance direction of the ceramic green sheet. Is desirable. That is, the second print marks 82a and 82b printed in the fourth color gravure printing process are printed at positions that are separated from the print marks 21a and 21b in the first color gravure printing process by a known amount in the ceramic green sheet conveyance direction. It is desirable to do.
[0075]
As described above, after the second gravure printing process for the fourth color is performed and corrected, the gravure printing process for the fourth color is performed according to the corrected condition.
As described above, in the second embodiment, the first and second gravure printing steps are performed to obtain the composite green sheet, and then the solid mother ceramic green sheet is thermocompression bonded, and the third and fourth colors are further bonded. As printing, the first and second printing steps are repeated. Moreover, the first printed mark printed by the first gravure printing process of the third color is applied to the first printed mark in the previous first gravure printing process after the solid mother ceramic green sheet is thermocompression bonded. , And the first gravure printing is performed by correcting the printing deviation in the third color printing. Further, the positional deviation amount of the print mark in the second gravure printing process of the fourth color is detected with respect to the print mark of the third color, and the printing deviation in the gravure printing process of the fourth color is corrected. By repeating such steps, a mother laminate in which a plurality of composite green sheets are laminated with high accuracy can be obtained. Thereafter, in the same manner as in the first embodiment, a multilayer ceramic capacitor is manufactured using a mother laminate.
[0076]
The shape of the print mark used in the present invention is not particularly limited. That is, not only rectangular or cross-shaped, but in FIG. 19A, a cross-shaped print mark is shown in which the portion extending parallel to the transport direction is relatively longer than the direction orthogonal to the transport direction. Yes. The printed mark shown in FIG. 19B has a ring shape, that is, a spherical shape. Thus, a print mark having only an outline may be used. Further, in FIG. 19C, the print mark is a triangle arranged so that the direction connecting the apex and the base is orthogonal to the transport direction, and the print mark shown in FIG. The printed mark shown in FIG. 19 (e) is a rhombus or square in which the corner portions facing each other are arranged in a direction perpendicular to the transport direction.
[0077]
In the above printing process, the first to fourth colors were printed by repeating the first and second gravure printing processes. However, when printing more times, as shown in FIG. The first print marks 91a and 91b for the first color may be arranged on the sides of the print marks 92a, 92b to 95a and 95b for the second to fifth colors. That is, when performing multicolor printing of n colors (n is an integer), printing marks from the second color to the n color are printed so as to be arranged at different positions in the printing direction of the ceramic green sheet, and the first color printing mark is It suffices to print n sets so as to be positioned on the side of the print marks for the respective colors. With this configuration, it is possible to always perform alignment with the first print mark printed in the first color during gravure printing for the second and subsequent colors.
[0078]
In the first gravure printing step, the step eliminating ceramic paste is printed, and in the second gravure printing step, the conductive paste is printed in the remaining area where the step eliminating ceramic paste is not printed. A composite green sheet may be obtained by reversing the printing order of the step-resolving ceramic paste.
[0079]
In the embodiment described above, the manufacturing method of the multilayer ceramic electronic component has been described. As is clear from FIG. 20, the present invention is a gravure printing method for performing multicolor printing n times (n is an integer of 2 or more). Can also be applied.
[0080]
Examples of the multilayer ceramic electronic component include a multilayer ceramic capacitor, a multilayer inductor, a multilayer varistor, a multilayer LC filter, a multilayer noise filter, and a multilayer composite module.
[0081]
The driving means 25 and 26 are not necessarily arranged on both sides of the gravure roll, and may be provided only on one side (the other side may be held so as to be movable in the θ direction).
[0082]
The trigger sensor mark is formed in the gravure printing process of the first and third conductive pastes, but may be formed in the gravure printing process of the second and fourth step eliminating ceramic pastes. The trigger sensor mark may be formed so as to overlap in both the first and second gravure printing processes.
[0083]
In the embodiment, the conductive paste is printed in the first gravure printing process and the step-resolving ceramic paste is printed in the second gravure printing process, but the reverse order may be used.
[0084]
The first and second print marks are provided on the same side of the print area, but with respect to the first print mark, the second print mark is provided on the opposite side with the print area in between. Also good. Correction accuracy is improved by increasing the distance between the first and second print marks. In addition, the correction accuracy is improved by increasing the distance between the plurality of print marks.
[0085]
The composite sheet in which the ceramic green sheet is formed on the support film includes a sheet in which the conductive paste and the step-removing ceramic paste are each gravure-printed on the support film and the ceramic green sheet is formed thereon.
[0086]
【The invention's effect】
In the method for manufacturing a multilayer ceramic electronic component according to the present invention, a plurality of print marks are printed in the first gravure printing step, and a plurality of second print marks are printed also in the second gravure printing step. Later, the shift amount of the second print mark with respect to the first print mark is detected, and the second and subsequent second gravure printing steps are performed under the conditions corrected according to the shift amount. Then, by obtaining the first and second gravure printing processes, a composite green sheet having a conductive paste and a step-resolving ceramic paste is formed with high accuracy, and the process of forming the composite green sheet is repeated to conduct the conductive A mother laminate in which pastes are laminated with high accuracy can be obtained. Therefore, it is possible to provide a multilayer ceramic electronic component having excellent reliability. In particular, since the first and second gravure printing steps are performed as described above, the step-resolving ceramic paste and the conductive paste can be printed with high accuracy.
[0087]
In the gravure printing method according to the present invention, when performing multicolor printing, a plurality of print marks are printed in each gravure printing step, and the deviation amount of the plurality of print marks currently printed with respect to the plurality of print marks printed last time is increased. The gravure printing process is corrected according to the detected deviation amount. Accordingly, multicolor printing can be performed with high accuracy. In particular, in order to detect the shift amount of the plurality of print marks with respect to the plurality of print marks, not only the printing direction and the direction orthogonal to the printing direction but also the twist direction can be corrected.
[Brief description of the drawings]
FIG. 1 is a schematic plan view for explaining a state after performing a first gravure printing step in an embodiment of the present invention.
FIG. 2 is a schematic partially cutaway plan view showing a state after the second gravure printing step is performed in the first embodiment of the present invention, in which a positional deviation has occurred.
FIG. 3 is a schematic front view for explaining an example of a mechanism for correcting a displacement in a twist direction.
FIG. 4 is a schematic configuration diagram showing an example of a manufacturing apparatus for performing first and second gravure printing processes in an embodiment of the present invention.
FIG. 5 is a perspective view for explaining a first gravure roll.
FIG. 6 is a partially cutaway front sectional view for explaining a step of forming a mother laminate obtained in the first embodiment of the present invention.
FIGS. 7A and 7B are a front sectional view showing a mother laminated body obtained in the first embodiment of the present invention and a front sectional view showing a laminated body of individual multilayer ceramic capacitor units.
FIG. 8 is a front cross-sectional view showing a multilayer ceramic capacitor as a multilayer ceramic electronic component obtained in an embodiment of the present invention.
FIG. 9 is a schematic block diagram for explaining an apparatus for detecting and correcting misalignment in the first embodiment of the present invention.
FIG. 10 is a schematic partially cutaway plan view showing a state after performing a first gravure printing step in the second embodiment of the present invention.
FIGS. 11A and 11B are a schematic partial cutaway plan view showing a state after the second gravure printing step and a portion where a print mark is formed in the second embodiment. FIG.
FIG. 12 is a schematic diagram showing a result obtained when a positional deviation is detected using a relatively large print mark.
FIG. 13 is a schematic diagram for explaining a state and amount of misalignment captured when detecting misalignment using a relatively small print mark.
FIG. 14 is a schematic front view for explaining an apparatus for detecting misalignment caused by a relatively large print mark and a relatively small print mark.
FIG. 15 is a schematic partial cutaway plan view showing a state after printing the step-resolving ceramic paste after the second gravure printing step.
FIGS. 16A and 16B are a schematic partially cutaway plan view and a schematic enlarged plan view of a portion provided with a print mark, showing a state after thermocompression bonding of a plain mother ceramic green sheet; .
FIGS. 17A and 17B are partial cutaway plan views showing a state after performing the second first gravure printing process as the third color printing, and an enlarged portion where the print mark is formed. FIG.
FIGS. 18A and 18B are schematic partial cutaway plan views showing a state after a second second gravure printing step as a fourth color printing step and portions where printing marks are formed; The typical top view which expands and shows.
FIGS. 19A to 19E are plan views showing modified examples of the shape of a print mark. FIGS.
FIG. 20 is a schematic partial cutaway plan view for explaining an arrangement form of print marks suitable for performing multicolor printing.
FIG. 21 is a schematic plan view for explaining a process of printing a conductive paste and a step-resolving ceramic paste in a conventional method for producing a multilayer ceramic electronic component.
[Explanation of symbols]
2 ... Sheet
3, 4 ... 1st and 2nd gravure printing section
5 ... 1st gravure roll
6 ... 1st press contact roll
7a ... 1st printing part
7c, 7d ... Print mark printing section
7e: Print section for printing trigger sensor marks
11 ... Second gravure roll
11a ... axis
12 ... Second pressure contact roll
21a, 21b ... first print mark
22 ... Trigger sensor mark
23a, 23b ... second print mark
27 ... Composite green sheet
28 ... Solid mother ceramic green sheet
31 ... Mother laminate
32 ... Conductive paste
33 ... Laminated body
34. Ceramic sintered body
35, 36 ... external electrodes
41, 42 ... Camera
43 ... Trigger sensor
44. Image processing apparatus
45 ... Light source
46 ... Andgate
51 ... Controller
52 ... Data processing unit
53 ... Upper communication part
54. Angle and speed detector
55a, 55b ... Misalignment correction unit
62, 63 ... Positioning motor
64a, 64b ... positioning motor
71 ... Solid mother ceramic green sheet
72a, 73a ... first print mark of the third color
73 ... Mark for trigger sensor
82a, 82b ... the second print mark of the fourth color
91a, 91b ... first print mark
92a, 92b to 95a, 95b ... second to fifth printing marks

Claims (10)

Preparing a long composite sheet in which a ceramic green sheet is formed on a support film;
A first gravure printing step of printing a conductive paste or a step-resolving ceramic paste by a gravure printing method on a first region in a printing region on the ceramic green sheet;
A second gravure printing step of printing a step-resolving ceramic paste or conductive paste by a gravure printing method in a second region in the printing region on the ceramic green sheet,
In the first gravure printing step, a plurality of printing marks are printed outside the printing region, and in the second gravure printing step, a plurality of second printing marks are printed outside the printing region,
After the second gravure printing step, the second gravure printing step from the next time is performed so as to detect the deviation between the first printing mark and the second printing mark and eliminate the obtained deviation amount,
A method for producing a multilayer ceramic electronic component, further comprising a step of obtaining a laminate by repeating a step of laminating a composite green sheet comprising the ceramic green sheet, a conductive paste, and a step eliminating ceramic paste. In detecting a deviation between the plurality of first print marks and the plurality of second print marks, a deviation amount along the ceramic green sheet conveyance direction, a deviation amount in a direction orthogonal to the ceramic green sheet conveyance direction, and a plurality of deviations 2. The manufacture of a multilayer ceramic electronic component according to claim 1, wherein a deviation amount in a twist direction, which is an angle formed between a direction connecting the first print marks and a direction connecting the plurality of second print marks, is detected. Method. The multilayer ceramic electronic component according to claim 1 or 2, wherein each of the plurality of first print marks and the plurality of second print marks has a relatively large print mark and a relatively small print mark. Method. The method for manufacturing a multilayer ceramic electronic component according to claim 3, wherein the relatively large printed mark is arranged in front of the relatively small printed mark in the printing direction. In performing the second gravure printing step so as to eliminate the deviation amount, the timing of conveying the ceramic green sheet and the position of the ceramic green sheet in a direction orthogonal to the conveying direction are adjusted. The manufacturing method of the multilayer ceramic electronic component in any one. The angle formed by the axial direction of the gravure roll and the conveying direction of the ceramic green sheet is adjusted in performing the second gravure printing step so as to eliminate the deviation amount. Manufacturing method for multilayer ceramic electronic parts. In the step of laminating the mother ceramic green sheets, a third plurality of print marks are printed on the plain mother ceramic green sheets after lamination, and the next composite green is based on the plurality of third print marks. The first gravure printing process is performed so that a shift of the first print mark applied in the first gravure printing process for obtaining the sheet is detected, and thereby the printing shift of the first gravure printing process is corrected. Item 7. A method for producing a multilayer ceramic electronic component according to any one of Items 1 to 6. The process of obtaining the said laminated body is further equipped with the process of repeating the process of laminating | stacking a plain ceramic green sheet further on the composite green sheet on the said support film in multiple times. The manufacturing method of the multilayer ceramic electronic component of description. The composite green sheet of a plurality of layers is formed on the support film and the step of obtaining the laminate is performed by repeating the step of laminating the composite green sheets of the plurality of layers a plurality of times. The manufacturing method of the multilayer ceramic electronic component in any one of 1-7. A gravure printing method in which a plurality of gravure printing steps are performed to perform multicolor printing,
In each gravure printing step, a plurality of print marks are printed, and a step of detecting a shift amount of a plurality of print marks that are currently printed with respect to a plurality of print marks printed last time;
And a step of performing the next gravure printing step so as to correct the gravure printing step according to the detected deviation amount.

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