JPH1167577A - Manufacture of laminated ceramic electronic component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the production efficiency of a highly laminated ceramic electronic component by a method wherein inner electrodes are formed in the center part of the surface of a green sheet and a thickness adjustment electrode is formed on the peripheral parts of the green sheet. SOLUTION: A slurry consisting of a barium titanate is applied on the surface of a carrier film 1 and after the slurry is dried, the film 1 is cut to form green sheets 2 and the sheets 2 are lamination-pressed to form an invalid layer 6. Then, the first layer green sheet 2, which is printed with a group of inner electrodes 3 in the center part of the surface of the sheet 2 and moreover, is printed with an L-shaped thickness adjustment electrode 4 with the bent part formed into a circular arc shape on the whole, with which the length of the electrode 4 comes into contact, of the two sides of the sheet 2 in a width of 2 mm as a thickness adjustment electrode 4 on the peripheral parts 5 of the sheet 2, is inverted to superpose the sheet 2 on the layer 6 and after the sheet 2 is pressed, the film 1 is peeled from the sheet 2. Then, the second layer green sheet 2 printed with inner electrodes 3 is inverted, the inner electrodes 3 are shifted by 1.2 mm as a shift width 7 in the lengthwise direction of the electrodes 3 to superpose the second layer sheet 2 on the layer 6 and after the two layer sheet 2 is pressed, the film 1 is peeled from the second layer sheet 2. After that, 30 layers of the green sheets 2 are laminated in order and are pressed and after the peeling of the film 1 is repeated, the upper invalid layer 6 is superposed on the sheets 2 to conduct a proper pressing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a multilayer ceramic electronic component.

[0002]

2. Description of the Related Art A conventional method for manufacturing a multilayer ceramic electronic component will be described with reference to the drawings.

FIG. 3 is a plan view showing a state in which an internal electrode 3 is applied to the surface of a green sheet 2 formed on a carrier film 1, and FIG. 4 is a green sheet in which the internal electrode 3 is printed on the surface of an ineffective layer 6. FIG. 4 is a view showing a method of peeling a carrier film 1 after laminating 2;

After the first green sheet 2a on which the internal electrode 3 is printed on the green sheet 2 on the carrier film 1 is turned over on the lower inactive layer 6 prepared in advance and laminated and pressed, as shown in FIG. A roller 8 having an adhesive tape 10 wound around the surface of the carrier film 1 is brought into contact with the carrier film 1, and the carrier film 1 is peeled off. Next, on the first green sheet 2a, the second green sheet 2b on which the internal electrode 3 is printed on the green sheet surface on the carrier film 1 is inverted, and the second green sheet 2b is shifted in the longitudinal direction of the internal electrode 3 by the second width 7. After the green sheet 2b is displaced, the lamination pressure is applied, and then the carrier film 1 is peeled off. Next, the third green sheet is matched with the first green sheet 2a, and the fourth green sheet is matched with the second green sheet 2b.
After the necessary number of layers are pressed in order so as to match the above, the upper ineffective layer prepared in advance is further overlaid and pressed. Thereafter, a method of cutting and firing the green block into a predetermined shape to produce a multilayer ceramic electronic component has been generally used.

[0005]

When a large number of green sheets 2a and 2b on which the internal electrodes 3 are printed are laminated in order to cope with the high lamination of the multilayer ceramic electronic component, the internal electrodes 3 are printed on the surfaces of the green sheets 2a and 2b. The thickness difference between the printed portion and the unprinted corner portion increases, making it difficult to uniformly press the entire surface of the laminate. When the carrier film 1 is peeled off after the lamination pressure, the green color increases as the laminate thickness increases. A phenomenon occurs in which the peripheral portions 5 of the sheets 2a and 2b, on which the internal electrodes 3 are not printed, are peeled off while being adhered to the carrier film 1, or the adhesive surface of the laminate is peeled off due to stress when the carrier film 1 is peeled off. The green sheets 2a and 2b are again adsorbed by the static electricity on the carrier film 1 which has been peeled off, and the green sheets 2a and 2b are coated. Part is there is a problem that bent.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a high-stack green sheet.
In order to eliminate the thickness difference between the part where the internal electrode of the green sheet is printed and the peripheral part where the internal electrode is not printed, the thickness adjustment electrode is printed on the green sheet simultaneously with the printing of the internal electrode, so that the green sheet is printed. Even when a large number of layers are pressed, the entire laminate can be pressed uniformly, and the adhesion strength between the green sheet near the peeling start position of the carrier film and the printed portion of the internal electrode becomes the same, and the green sheets adhere to the carrier film It will not be peeled off as it is.

[0007]

DETAILED DESCRIPTION OF THE INVENTION According to the first aspect of the present invention, the thickness of a green sheet on a carrier film is adjusted with an internal electrode on the lower ineffective layer body on which a predetermined number of ceramic green sheets are laminated under pressure. The carrier film is peeled off after the first green sheet on which the electrode for printing is printed is inverted by laminating and pressurizing, and then the internal electrode and the thickness are adjusted on the first green sheet, on the green sheet surface on the carrier film. The carrier film is peeled off after laminating and pressing the second green sheet on which the electrodes for printing have been printed, and then a predetermined number of ceramic green sheets prepared in advance are laminated on the upper ineffective layer body, and the main pressing is performed. This is a method of manufacturing a laminated ceramic electronic component including a step of performing a process of forming a multilayer ceramic electronic component. The thickness difference between the unprinted portion of the electrode is reduced, it can be uniformly pressurized the entire laminate. Therefore, even when a large number of green sheets are laminated, it is possible to eliminate the trouble that occurs when the carrier film is peeled off.

According to a second aspect of the present invention, at least one thickness adjusting electrode is printed in an L-shape on the peripheral portion of the green sheet, whereby a large number of green sheets are laminated. However, the difference in thickness between the internal electrode portion of the laminate and the peripheral portion where the internal electrode is not printed is reduced, and the whole can be uniformly pressed. Therefore, it is possible to eliminate the trouble that occurs when the carrier film of the laminate in which many green sheets are laminated is peeled off.

According to a third aspect of the present invention, an L-shaped electrode for adjusting the thickness is printed to have substantially the same thickness as the internal electrode. The thickness difference between the electrode portion and the peripheral portion can be eliminated. Therefore, it is possible to eliminate the trouble when the carrier film is peeled off after the green sheets are stacked.

According to a fourth aspect of the present invention, an L-shaped electrode for adjusting the thickness is provided near a peripheral portion where the carrier film starts to be peeled off after the green sheet lamination pressure is applied. By providing the L-shaped thickness adjusting electrode, the thickness difference between the internal electrode portion and the peripheral portion of the laminated body in which the green sheets are laminated is reduced, and the entire body can be uniformly pressed. Moreover, by providing the carrier film near the position where peeling starts after laminating the green sheets, the adhesive force between the laminated green sheets near the peeling start is strong, and only the carrier film can be easily peeled off.

According to a fifth aspect of the present invention, the width of the L-shaped electrode for adjusting the thickness is sequentially larger, and is larger than the shift width of the internal electrode of the lower green sheet. The width should not exceed double. Thus, even when the green sheets on which the internal electrodes are printed are alternately shifted by a fixed amount for each stage, as in a multilayer ceramic capacitor, the thickness difference between the internal electrode portion and the peripheral portion of the multilayer body does not always occur. In addition, the entire laminate can be uniformly pressed.

According to a sixth aspect of the present invention, the length of the side of the L-shaped thickness adjusting electrode is made longer than one third of the short side of the green sheet to be laminated. When the carrier film is peeled off after laminating the green sheets, the carrier film can be easily peeled off from the green sheets if the surrounding green sheets are strongly adhered to each other in a certain area near the peeling start position. Because it can be.

According to a seventh aspect of the present invention, the width of the bent portion of the L-shaped electrode for adjusting the thickness is made wider than that of the other portions. This is to increase the bonding area between the green sheets near the position where the peeling starts, and to increase the bonding strength.

According to an eighth aspect of the present invention, the bent portion of the L-shaped thickness adjusting electrode is formed in an arc shape, and the bent portion is formed in an arc shape so that the green sheet after lamination is formed. Thus, the bonding area between the green sheets near the position where the carrier film starts to be peeled from the green sheet can be increased.
Therefore, the adhesive force between the green sheets becomes stronger.

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a state in which an internal electrode 3 and a thickness adjusting electrode 4 are printed on the surface of a green sheet 2 formed on a carrier film 1, and 5 is a peripheral portion. FIG. 2 shows a state in which a carrier film 1 of a laminate in which a predetermined number of green sheets 2 on which internal electrodes 3 and the like are printed is laminated,
Reference numeral 6 denotes an ineffective layer, 7 denotes a shift width of the internal electrode 3, 8 denotes a roller grounded for removing static electricity, and 9 denotes a conductive double-sided adhesive tape.

First, a slurry having a composition containing barium titanate as a main component is applied to a surface of the carrier film 1 to a thickness of 20 μm and dried.
Green sheet 2 cut to dimensions of 50 mm x 145 mm wide
Create Next, ten green sheets 2 are laminated and pressed to form an ineffective layer 6. Next, as shown in FIG. 1, two groups of internal electrodes 3 each having a length of 2.1 mm × 0.8 mm in the center and a thickness adjusting electrode 4 in the peripheral portion 5 are 2.0 mm in width and 2 mm in length at the center. A first-layer green sheet 2 on which an L-shaped thickness adjusting electrode 4 having an arc-shaped bent portion is printed as a whole.
Is reversed and overlaid on the ineffective layer 6, and after pressing, the carrier film 1 is peeled off. Next, the green sheet 2 on which the second-layer internal electrodes 3 and the like are printed is inverted, and the internal electrodes 3 are overlapped with each other in a lengthwise direction with a shift width 7 of 1.2 mm and pressurized. The film 1 is peeled off. Thereafter, the thirty-layer green sheets 2 are laminated, pressed, and carrier film sequentially so that the odd-numbered layer overlaps the position above the first-layer internal electrode 3 and the even-numbered layer overlaps the position above the second-layer internal electrode 3. After repeating the peeling of 1, the upper ineffective layer 6 is further laminated and
The main pressure was applied at a pressure of 00 kg / cm ² to produce a laminate.

After laminating and pressing, the carrier film 1 is peeled off by the method shown in FIG. 2, and a roller 8 having a conductive double-sided adhesive tape 9 mainly composed of carbon adhered to the surface thereof is adjusted in thickness of the carrier film 1. The carrier film 1 was peeled off while the roller 8 was moved upward and rotated while being brought into contact with and adhered to the vicinity of the peripheral portion where the electrode 4 was printed. Since the static electricity generated when the carrier film 1 is peeled off by this method is removed via the ground, the peripheral portion 5 of the laminate from which the carrier film 1 has been peeled off has a weak adhesive force, and is re-adsorbed and peeled off. The phenomenon that the part is bent does not occur.

Further, the L-shaped thickness adjusting electrode 4 formed on the peripheral portion 5 of the green sheet 2 eliminates the difference in thickness between the portion where the internal electrode 3 is formed and the peripheral portion 5, and the green sheet 2 is highly laminated. In this case, the entire laminate can be uniformly pressed and bonded, and when the carrier film 1 is peeled off, it can be peeled off cleanly without cutting the peripheral portion 5 of the green sheet 2. Therefore, it is possible to prevent troubles in the lamination process of the green sheets 2. The yield and working time of the laminate obtained by laminating the green sheets 2 as described above are shown in Table 1 in comparison with the conventional method.

[0020]

[Table 1]

As shown in Table 1, in the manufacturing method of the present invention, the peripheral portion 5 of the green sheet 2 was cut off when the carrier film 1 was peeled off, and was not peeled off together. All laminates are complete. Further, since a mechanism having a function of removing static electricity is used for peeling the carrier film 1, the peripheral portion 5 where the green sheet 2 has a weak adhesive force is attracted by static electricity generated at the time of peeling, and the phenomenon that the end portion is bent does not occur. The rework time is eliminated, and the laminating operation can be performed continuously.

In this embodiment, the thickness adjusting electrode 4 is used.
Is formed on the periphery of the green sheet 2 near the peeling start position of the carrier film 1, but it is desirable to provide the green sheet 2 on the entire periphery 5 of the four sides of the green sheet 2 for completeness. However, in the case of laminating about thirty layers of the green sheets 2, it is possible to sufficiently prevent trouble only at one place. Although the thickness adjusting electrode 4 is formed on the entire two sides of the green sheet, the peripheral portion 5 of the green sheet 2 is formed on the carrier film 1 if the length is at least one third of the short side of the green sheet 2. It has been confirmed that it does not cut during peeling. Further, the bent portion of the L-shaped thickness adjusting electrode 4 is formed in an arc shape and has a larger width than the other portions, so that a plurality of L-shaped thickness adjustments can be made near the peeling start position of the carrier film 1. It has also been confirmed that the effect can be sufficiently exhibited without forming the electrode 4 for use.

[0023]

As described above, according to the present invention, the use of a green sheet having an internal electrode formed in the center of the green sheet surface and an adjustment electrode formed in the periphery thereof enables the production of a multilayer ceramic electronic component capable of high stacking. In this case, the problem that the peripheral portion of the green sheet is cut is solved, and it is possible to provide an excellent method for producing a multilayer ceramic electronic component with high production efficiency.

[Brief description of the drawings]

FIG. 1 is a plan view showing a printed state of an internal electrode and a thickness adjusting electrode formed on a green sheet surface according to an embodiment of the present invention.

FIG. 2 is a front view showing a carrier film peeling method.

FIG. 3 is a plan view showing a printing state of an internal electrode formed on a conventional green sheet surface.

FIG. 4 is a front view showing the carrier film peeling method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Carrier film 2 Green sheet 3 Internal electrode 4 Thickness adjustment electrode 5 Peripheral part 6 Invalid layer 7 Offset width 8 Roller 9 Conductive double-sided adhesive tape

Claims (8)

[Claims] 1. A first green sheet in which an internal electrode and a thickness adjusting electrode are printed on a green sheet surface on a carrier film on a lower ineffective layer body surface on which a predetermined number of ceramic green sheets are laminated under pressure. After laminating and pressing, the carrier film is peeled off, and then, on the first green sheet, the second green sheet having the internal electrode and the thickness adjusting electrode printed on the green sheet surface on the carrier film is inverted. A method for manufacturing a laminated ceramic electronic component, comprising the steps of: removing a carrier film after laminating and pressurizing; and laminating an upper ineffective layer body obtained by laminating a predetermined number of ceramic green sheets prepared in advance and then performing main pressing. 2. The method for manufacturing a multilayer ceramic electronic component according to claim 1, wherein at least one or more thickness adjusting electrodes are printed in an L-shape on the periphery of the green sheet. 3. The method for manufacturing a multilayer ceramic electronic component according to claim 1, wherein the L-shaped thickness adjusting electrode is printed to have substantially the same thickness as the internal electrode. 4. The multilayer die according to claim 1, wherein the L-shaped thickness adjusting electrode is provided in the vicinity of a peripheral portion where the carrier film starts to be peeled after the green sheet laminating and pressing. Manufacturing method of ceramic electronic components. 5. The width of the L-shaped thickness adjusting electrode is set to be larger than the offset width of the internal electrodes of the first and second green sheets to be sequentially laminated and not to exceed twice the offset width. The method for manufacturing a multilayer ceramic electronic component according to any one of claims 1 to 4. 6. The lamination according to claim 1, wherein the length of the side of the L-shaped thickness adjusting electrode is longer than one third of the short side of the green sheet to be laminated. Manufacturing method of ceramic electronic components. 7. The method for producing a multilayer ceramic electronic component according to claim 1, wherein the width of the bent portion of the L-shaped thickness adjusting electrode is wider than other portions. 8. The method for manufacturing a multilayer ceramic electronic component according to claim 7, wherein the bent portion of the L-shaped thickness adjusting electrode has an arc shape.