KR20180016266A - Mlcc manufacturing method of increasing efficiency of mlcc and mlcc produced therefrom - Google Patents

Abstract

The present invention relates to an MLCC manufacturing method using a thermal transfer printer. The MLCC manufacturing method for increasing the efficiency of an MLCC comprises the processes of: forming a laminate of a predetermined standard by stacking an internal electrode on a ceramic dielectric by thermal transfer; and increasing the entire area of the internal electrode by repeatedly stacking the laminate of the ceramic dielectric and the internal electrode in accordance with the first process. The process of forming the laminate includes the steps of: transferring a thermal transfer film, on which the internal electrode is printed, from a supply core to a winding core, and transferring a thermal transfer film, which faces the same, on which the ceramic dielectric is printed, from the supply core to the winding core; and thermally transferring the internal electrode on the surface of the film onto the ceramic dielectric on the surface of the film by the heating pressing of a printer head to form a thermal transfer film having a stack of the ceramic dielectric and the internal electrode. In addition, the process of forming the laminate further includes a step of installing the ceramic dielectric, as a spacer, by thermal transfer in each pore between internal electrodes stacked on the surface of the ceramic dielectric.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a MLCC (MLCC) manufacturing method and a MLCC (MLCC)

The present invention relates to a multilayer ceramic capacitor (MLCC), and more particularly, to a manufacturing method for increasing the efficiency of an MLCC and an MLCC manufactured thereby.

In general, a multi-layer ceramic capacitor (MLCC) is a part capable of temporarily storing electricity. It uses a characteristic that AC can not pass but DC can not pass. It is an electronic component used in various applications such as DC-blocking, By-passing and coupling in electronic devices.

In such an MLCC, a dielectric powder is formed into a thickness of several micrometers by tape casting or the like on each electronic device, electrodes are formed on the dielectric layer, electrodes are laminated on the dielectric layer, and the laminated layers are sintered at a high temperature, 1, a ceramic dielectric 1 (mainly TiO ₂ or MgTiO ₃ is used), an internal electrode 2 (Pd, Pd / Ag, Ni and Cu are used) and a termination 3 And has a structure in which a thin ceramic dielectric 1 and an internal electrode 2 are alternately stacked.

The reason why the ceramic dielectric 1 and the internal electrodes 2 are laminated in multiple layers is to miniaturize the MLCC and increase the capacitance of the MLCC. Miniaturization and thinning have been made, and there is a growing demand for miniaturization of MLCC.

C = capacitance

εo: Permittivity in vacuum

εr: dielectric constant of the dielectric

n: number of laminated MLCC

A: area of internal electrode

d: thickness of the dielectric

As can be seen from the above equation, in order to increase the capacitance, there is a method of increasing the area A of the internal electrode or decreasing the thickness d of the dielectric. However, in practice, the area of the single plate device It is practically impossible to increase the volume efficiency, so that the bulk efficiency can be increased through the lamination as in the method of Fig. 1, so that a larger capacitance per unit volume can be obtained, thereby achieving miniaturization.

A patent application relating to a method of manufacturing such a multilayer ceramic capacitor (MLCC) is disclosed in Publication No. 10-2005-0096298.

In general, it is desirable to increase the area A of the internal electrode to obtain the same capacitance in a smaller MLCC or to obtain a larger capacitance in the same volume, and to increase the area A of the internal electrode, The number of laminations must also be increased.

Silk screen printing and gravure printing are the most common methods of printing internal electrodes.

Silk screen printing is a kind of stencil printing method similar to the spine board, which makes a character or figure type that blocks the filtration of printing paint on a rough silk cloth and prints this cloth on a simple frame using a rubber roller There is a limitation in increasing the number of stacks in order to increase the capacitance in the same volume because it is difficult to reduce the thickness of the stainless plate or the most commonly used method for printing the internal electrodes.

Unlike ordinary paper printing, gravure printing uses a copper plate. It is a concave printing (intaglio printing) method in which ink is filled in a concave portion of the plate and pressure is applied to the plate. In order to reduce the thickness of the internal electrode and increase the productivity, The production facility is a gravure printing press. Although the depth of the cylinder can be made as thin as desired, the viscosity of the internal electrode in a liquid state should be remarkably lower than that of the silk screen method. If the viscosity is low, it is difficult to form the shape of the internal electrode If the viscosity is high, the shape is not difficult to form, but it is difficult to lower the thickness, and the film is not printed well, resulting in a disadvantage that the percentage of defects is remarkably increased.

A thermal transfer printing method can be used as a method capable of overcoming the limitations of the silk screen or gravure printing.

In thermal transfer printing, a printer prints an ink mixed with a solvent, a dye or a pigment or a binder with a binder on a PET film, mounts the film on a printer, and applies heat to the print head to produce a desired portion And the ink is transferred to a target substrate.

Dyes are mainly used for the purpose of printing ID cards or photographs. Carbon inks are also used for the purpose of printing receipts, although they are also used to print personal information or bar codes on ID cards. Pigment has strong light resistance and scratch resistance, so that a small amount thereof is tried to be used for issuing ID cards. However, since the printing quality is less than dye, its use is limited and it is used more as a substitute for carbon.

However, in the early days of development of a thermal printer, a thermal element (heat element) for heating the print head was about 100 inches, and in recent years it was developed to realize a high resolution of 2400 inches. However, for the purpose of printing the internal electrodes described above, since 300 to 600 thermoelectric elements of about 1 inch are enough to realize a sufficient print quality, the usefulness of the developed technology is deteriorated.

The present invention has been developed in order to overcome the above-described problems, and it is an object of the present invention to provide an MLCC manufacturing method for increasing the efficiency, i.e., capacitance, of an MLCC by increasing the total area of internal electrodes through stacking a larger number of internal electrodes, The present invention has the main object of the present invention.

According to an aspect of the present invention, there is provided a method of manufacturing an MLCC that increases the efficiency of an MLCC, the method comprising the steps of: laminating internal electrodes on a ceramic dielectric by thermal transfer to form a laminate of a predetermined size; And increasing the total area of the internal electrodes by repeatedly laminating a laminated body of the ceramic dielectric and the internal electrodes according to the thickness of the internal electrode,

Wherein the step of forming the laminate comprises:

Transferring the thermal transfer film on which the internal electrode is printed from the feed core to the take-up core, and transferring the thermal transfer film on which the ceramic dielectric is printed from the feed core to the take-up core in opposition thereto; And thermally transferring the internal electrodes of the film surface onto the ceramic dielectric of the film surface by heat pressing of the print head to form a thermal transfer film having a laminate of a ceramic dielectric and an internal electrode,

Further comprising installing a ceramic dielectric as a spacer by thermal transfer on each of the gaps between internal electrodes stacked on the surface of the ceramic dielectric,

A first step of transferring the internal electrodes from the first film ribbon onto the ceramic dielectric of the second film ribbon; and a step of transferring the spacers from the first film ribbon to the respective internal electrodes between the internal electrodes transferred to the second film ribbon And the second process for successively performing the above process is performed in one thermal transfer printer.

In the present invention, a PET film is used as the thermal transfer film, a thickness of the PET film on which the internal electrode is printed is in the range of 3 to 10 mu m, and a thickness of the PET film on which the ceramic dielectric is printed is in the range of 12 to 70 mu m. The inner electrode is printed on one side of the base PET film layer, and a release agent layer is formed between the inner electrode and the base PET film layer. On the other side of the base PET film, the base PET film layer is protected A back coating layer of a predetermined material having a predetermined slip property is printed so as to improve the printing quality by smoothly moving the film during printing and an adhesive layer is formed between the back coating layer and the base PET film layer. In addition, the internal electrode includes a binder that increases the bonding force with the silicon dielectric layer in comparison with the bonding force with the release agent layer, and the binder is configured to be completely burned through a binder burn-out process.

As described above, the release layer is printed on the PET film so that the internal electrodes can be well separated, the internal electrodes are printed on the release layer, and the internal electrodes are cut to a width suitable for the thermal printer to form thermoelectric When the inner electrode is printed on a film printed with a dielectric layer on a printer of a desired size, it is possible to print a 0.3-μm-thick inner electrode, which is difficult to implement in a silk screen method or a gravure method. In the case of such a thermal transfer printing, since the edges of the printed surface are cleanly cut without causing blurring of the ink as in the case of a silk screen or a gravure method in which printing is performed in a liquid phase, there is an advantage that a variation in capacitance value between products can be reduced, The uniformity of application by ink printing is doubled, so that the number of stacked internal electrodes can be greatly increased, and a small amount of light can be obtained.

According to the present invention, a thermal transfer printer transfers a first film ribbon, which is alternately repetitively printed with internal electrodes and spacers, from a feed core to a winding core, and a second film ribbon printed with a ceramic dielectric corresponding thereto, The printer head is positioned vertically liftable from the upper portion of the first film ribbon between the feed core and the winding core and the lower portion of the second film ribbon drawn out from the lower core is heated by the print head A supporting roller corresponding to the print head is disposed to support the pressing, and a conveying roller is provided between the lower core and the supporting roller, the conveying roller having a plurality of teeth along the circumference. The conveying roller has a function of pulling the second film ribbon out of the lower core by a predetermined length in the operation stop state of the first film ribbon and the role of the second film ribbon being rolled back to the lower core, And the second film ribbons are guided while the internal electrodes or the spacers are thermally transferred by the second film ribbons.

From the above-described characteristics, it is possible to print the thickness of the internal electrode thinner through the thermal transfer printing method, thereby overcoming the limitation of the printing in the silk screen or gravure printing. In addition, the present invention can increase the number of internal electrode stacking due to the internal electrodes printed thinner, and can increase the area of the internal electrodes, thereby further increasing the efficiency, i.e., the capacitance, of the MLCC. In addition, according to the present invention, it is possible to miniaturize / lighten the MLCC, to ensure uniformity between products, and to ensure stable operation. Also, according to the present invention, it is possible to prevent the pores between the stacked bodies from collapsing even when a plurality of stacked layers of the internal electrode and the ceramic dielectric are stacked repeatedly.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional view showing the internal configuration of a general type of multilayer ceramic capacitor (MLCC)
Fig. 2 is a first embodiment of a method for manufacturing a multilayer ceramic capacitor (MLCC) according to the present invention,
3 is a cross-sectional view of an internal electrode film provided for transfer to a ceramic dielectric film in the first step of FIG. 2,
4 is a view showing a second process of the MLCC manufacturing method according to the present invention,
FIG. 5 is a cross-sectional view showing a laminate of a ceramic dielectric and an internal electrode according to the first process of FIG. 2;
FIG. 6 is a cross-sectional view of a final MLCC product having a repeated laminated structure of the laminate according to FIG.
7A is a cross-sectional view showing a phenomenon in which pores between internal electrodes collapse due to multilayer stacking, and FIG. 7B is a cross-sectional view Sectional view showing a phenomenon in which cracks are generated in the MLCC cutting process due to the air gap collapse phenomenon of 7a,
FIG. 8 is a cross-sectional view of a MLCC according to a second embodiment of the present invention. FIG.
9 is a view showing a first step of the MLCC manufacturing method according to FIG. 8,
10 is a view showing a second step of the MLCC manufacturing method according to FIG. 8,
FIG. 11 is a view showing a configuration of equipment for performing the processes of FIGS. 9 and 10 according to the MLCC manufacturing method of FIG. 8 and an installation state of film ribbons placed thereon,
FIG. 12 is an operating state diagram showing the first step process of FIG. 9 for manufacturing the multilayer ceramic capacitor (MLCC) of the present invention in the arrangement of FIG. 11;
Fig. 13 is an operating state showing the second step process of Fig. 9 for manufacturing the multilayer ceramic capacitor (MLCC) of the present invention in the arrangement of Fig. 11,
Fig. 14 is an operational state diagram showing the first step process of Fig. 10 for manufacturing the multilayer ceramic capacitor (MLCC) of the present invention in the arrangement of Fig. 11,
15 is an operational state diagram showing the second step process of FIG. 10 for manufacturing the multilayer ceramic capacitor (MLCC) of the present invention in the arrangement of FIG. 11. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, in which: FIG. do.

2 to 4 show a first embodiment of the MLCC production method of the present invention. Fig. 2 shows the first step of the MLCC production method of the present invention. Fig. 3 shows the first step of the MLCC production method of the present invention. Sectional view of an internal electrode film provided for transfer to a ceramic dielectric film, and Fig. 4 is a view showing a second step of the MLCC manufacturing method of the present invention.

According to the present invention, the MLCC (see FIG. 1) has a structure in which the ceramic dielectric 1 and the internal electrode 2 are alternately stacked, and a termination 3 is formed on one side thereof. For this purpose, the ceramic dielectric 1 and the internal electrode 2 are laminated on the thermal transfer films 4 and 5, respectively, for the purpose of laminating the ceramic dielectric 1 and the internal electrode 2 in the MLCC. Lt; / RTI >

2, a first process for laminating the ceramic dielectric 1 and the internal electrode 2 is performed by the thermal transfer printer 10. The thermal transfer printer 10 transfers the thermal transfer film 5 on which the internal electrode 2 is printed from the supply core 11 to the winding core 12 and transfers the thermal transfer film 5 on which the ceramic dielectric 1 is printed And the film 4 is conveyed from the feed core 14 to the winding core 15. At this time, the thermal transfer films 5 and 4 are moved to face each other under the printer head 13, and heat pressing of the printer head 13 causes the surface of the film 5 The internal electrode 2 is thermally transferred onto the ceramic dielectric 1 on the surface of the film 4 to form the thermal transfer film 6 having the lamination of the ceramic dielectric 1 and the internal electrode 2.

4, a second process for laminating the ceramic dielectric 1 and the internal electrode 2 is performed by the thermal transfer printer 10. The thermal transfer printer 10 transfers the thermal transfer film 6 having the laminated structure of the ceramic dielectric 1 and the internal electrode 2 from the supply core 11 to the winding core 12 and, And transports the green chip D through the supply roll 17. At this time, the thermal transfer film 6 and the hollow chip D of the MLCC move under the printer head 13 facing each other, and the heat of the film 6 The laminate of the ceramic dielectric 1 and the internal electrode 2 on the surface of the green chip D is thermally transferred.

The present invention can increase the area of the internal electrode through a greater number of stacking operations by repeatedly performing the above operation, thereby increasing the efficiency, i.e., the capacitance, of the MLCC.

On the other hand, the internal electrode is composed of a metal powder (mainly Pd, Pd / Ag, Ni, and Cu), a solvent, an organic binder, and a plasticizer. The internal electrodes can be printed on the release layer in a gravure manner. In this case, it is preferable to apply the micro gravure printing method. In the case of micro gravure printing, it is possible to print up to 0.5 μm in a liquid state and up to about 5 nm after drying.

In the case of the gravure printing method, a very complicated and troublesome process of forming a compact internal electrode shape into a cylinder and shaping it is required. In the case of the thermal transfer printing method of the present invention, however, It is possible to print less than 0.3μm on the basis of the solid thickness when the printing is designed so that the printing surface is evenly and uniformly applied at a low viscosity without need. In addition, after removing the binder through a binder burn-out process, it is possible to print at a thickness of 0.2 μm or less, so that more lamination can be performed at the same height, thereby achieving a higher capacitance , It is possible to provide a more compact MLCC. In particular, since the thermal transfer printing method is printed at a low point, the application becomes uniform, and it is possible to prevent the occurrence of an abnormal operation due to a hot spot or an electrical reaction.

PET films are basically used as the thermal transfer films 4, 5, and 6, and the thickness thereof is suitably about 3 to 10 mu m, preferably about 4.5 to 7 mu m. The inner electrode 2 is printed on one side of the base PET film layer 5-1 and the inner electrode is well spaced between the inner electrode 2 and the base PET film layer 5-1, A releasing layer 5-2 is formed. However, the release layer 5-2 can be omitted if a release layer is not required depending on the binder of the internal electrode 2 and the binder properties of the ceramic dielectric 1.

On the other side of the base PET film 5-1, a back coating layer 5-3 (heat resistance and slip layer) made of a predetermined material for improving heat resistance and slipperiness is printed, and the back coating layer 5-3 An adhesive layer 5-4 is printed between the base PET film 5-1 and the base PET film layer 5-1 so that the back coat layer 5-3 is more easily adhered to the base PET film 5-1. However, if the adhesive layer 5-4 is not required depending on the material constituting the back coating layer 5-3, this can be omitted. The back coating layer 5-3 prevents the base PET film layer 5-1 from being damaged by the heat applied by the printer head 13 on the surface contacting the thermal printer head 13 And can be provided for the purpose of reducing the movement resistance of the PET film.

As described above, the release layer 5-2 is printed on the base PET film layer 5-1 so that the internal electrodes can be well separated, the internal electrode 2 is printed on the release layer, The inner electrode 2 is printed on the PET film 4 printed with the dielectric layer 1 at a desired size after the dielectric layer 1 is cut to a suitable width and mounted on the thermal printer 10 having the high- It becomes possible to print internal electrodes having a thickness of 0.3 mu m, which is difficult to implement in a silk screen method or a gravure method.

In addition, in the case of such a thermal transfer printing, the edge of the printed surface is cleanly cut without causing blurring of the ink like a silk screen or a gravure method in which printing is performed in a liquid phase, so that the deviation of the capacitance value between the products can be reduced. The uniformity of application by low viscosity ink printing is doubled, and the number of stacked internal electrodes can be greatly increased, so that a small amount of thinning is possible.

The release layer 5-2 is a water based binder and has high affinity with PET so that only the internal electrode 2 does not fall off from the base PET film layer 5-1 and only the silicon dielectric 1 ) Of the recording medium. In this case, it is preferable that the dielectric layer 1 has a releasability such that it does not adhere to the internal electrode 2.

The binder of the internal electrode 2 has an adhesive force with the dielectric layer 1 as an organic binder while it does not have a binding force with the release layer 5-2 and has a binder burn out process To < RTI ID = 0.0 > 1500 C). ≪ / RTI >

The back coating layer 5-3 protects the base PET film layer 5-1 from the heat applied from the printer head 13 and smoothly moves the film during printing And is made of a predetermined material having a predetermined slip so as to increase the print quality.

The adhesive layer (5-4) is applied before the back coating to ensure that the back coating layer adheres well to the PET film. If the back coating layer adheres well to the PET film, this process can be omitted if necessary Do.

The target substrate is a PET film 4 on which the silicon dielectric 1 is coated and can be printed with a thickness of 0.3 μm by microgravure printing. In this case, the thickness of the PET film is suitably about 12 to 70 μm Do. It is preferable that the target substrate 4 has an adhesive force with the PET film so that at least the dielectric does not fall off toward the inner electrode.

The thermal transfer printer 10 to which the high-resolution printhead 13 is applied can employ both the roll-to-roll printing method and the roll-to-sheet printing method. In the case of the first step shown in FIG. 2, In the case of the second step of FIG. 4, a roll-to-sheet printing method can be applied. The number of thermoelectric elements can be selected from among 300 to 2400 thermoelectric elements per inch, and it is advantageous that the number of thermoelectric elements is as large as possible.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like elements throughout.

FIG. 5 is a cross-sectional view illustrating a laminated body of a ceramic dielectric and internal electrodes according to a first process of FIG. 2, and FIG. 6 is a cross-sectional view of a final MLCC product having a repeated laminated structure of the laminated body of FIG.

Referring to FIG. 5, the internal electrode 2 is thermally transferred onto the ceramic dielectric 1 according to the first process of FIG. 2 to form a laminate of the internal electrode and the ceramic dielectric. The multilayer structure of the internal electrode 2 and the ceramic dielectric 1 having such a sectional structure can constitute the MLCC product as shown in FIG. 6 through the repetitive lamination of the internal electrode 2 and the ceramic dielectric 1. By increasing the number of times of lamination, 2), it is possible to miniaturize the MLCC or obtain a larger capacitance.

7A is a cross-sectional view showing a phenomenon in which pores between internal electrodes collapse due to multilayer stacking, and FIG. 7B is a cross-sectional view 7a is a cross-sectional view showing a phenomenon in which cracks are generated in the MLCC cutting process due to the air gap collapse phenomenon.

As described above, in order to miniaturize the MLCC or to obtain a larger capacitance, it is desirable to increase the area of the internal electrode 2 relatively. To this end, it is desirable to increase the area of the internal electrode 2 and the multilayer structure of the ceramic dielectric 1 It is necessary to increase the number of times of lamination through lamination. A certain amount of heat and pressure is applied to the lamination of a plurality of layers ranging from several tens to several hundreds of layers. At this time, in the pores 2a positioned between the internal electrodes 2 for each layer, deflection occurs due to the applied pressure, (See B-deflection line in FIG. 7A). Further, as shown in FIG. 7B, when sagging or collapse occurs in the voids 2a due to repetitive pressing lamination of the stacked bodies, there is a fear that a crack C is generated in the process of cutting (D) the MLCC have.

Accordingly, the present invention proposes a method of preventing the air gaps between the stacks of the internal electrode and the ceramic dielectric from being broken or cracked through the following structure.

FIG. 8 is a cross-sectional view (FIG. 8A) and a plane view (FIG. 8B) of each constituent element in MLCC manufacture and a method of manufacturing MLCC through the MLCC manufacturing method according to a second embodiment of the present invention.

In this embodiment, in order to prevent air gap deflection and cracks as shown in FIG. 7, a method of forming spacers 1a on the voids located between the internal electrodes of the laminated body composed of the internal electrode and the ceramic dielectric is proposed do.

Forming a spacer (1a) is a ceramic dielectric (1) and has the same material may be used, the ceramic dielectric material is first printed as a spacer (1a) to the first film ribbon (F ₁₎ of the first film ribbon (F ₁ To the gaps 2a between the internal electrodes 2 of the respective stacks to be formed on the second film ribbon F ₂ which is the corresponding side of the second film ribbon F ₂ .

On the surface of the first film ribbon F ₁ provided first in this MLCC manufacturing method, internal electrodes 2 of a predetermined size and a ceramic dielectric 1a (hereinafter referred to as a spacer) as spacers are sequentially formed between the internal electrodes 2 As shown in FIG. A second film ribbon F ₂ on which the ceramic dielectric 1 is printed is provided on the side facing the surface of the first film ribbon F ₁ .

The first film In the configuration of the ribbon (F _1), the electrode (2) and the spacer (1a) is printed on one surface (preferably the lower surface) of the base PET film layer (b), the inner electrode (2) A releasing layer (a) is printed between the internal electrode 2 and the spacer 1a so that the internal electrode 2 and the spacer 1a can be well separated and transferred to the ceramic dielectric. This release layer (a) can be omitted if a release layer is not required depending on the binder of the internal electrode 2 and the binder properties of the ceramic dielectric 1. On the other surface (preferably, the upper surface) of the base PET film layer (b), a back coating layer (heat resistance and slip layer; c) made of a predetermined material for enhancing heat resistance and slipperiness is printed. The back coating layer c prevents the base PET film layer (b) from being damaged by heating of the printer head (23) in contact with the thermal printer head (23, see Fig. 11) And can be provided for the purpose of reducing the moving resistance of the film.

In addition, the second film In the configuration of the ribbon (F _2), a ceramic dielectric (1) has a base PET is printed on one surface (surface preferably upper part) of the film layer (e), the ceramic dielectric (1) and the base PET The release layer d is printed between the film layers e so that the laminate of the internal electrode 2 and the ceramic dielectric 1 to be formed thereafter can be easily separated.

As described above, the release layer (a) is printed on the base PET film layer (b) of the first film ribbon (F ₁ ) so that the internal electrode (2) and the spacer The electrodes 2 and the spacers 1a are successively repeatedly printed and then cut into a width suitable for the thermal printer to be mounted on a thermal printer 20 (see FIG. 11) provided with a high-resolution printhead 23 When the internal electrode 2 and the spacer 1a are transferred to the surface of the ceramic dielectric 1 of the second film ribbon F ₂ provided on the rear side corresponding to the rear side, And the like.

Next, the laminate of the internal electrode 2 and the ceramic dielectric 1 is formed from the first film ribbon F ₁ to the second film ribbon F ₂ , and the laminate of the internal electrodes 2 A method of printing the spacers 1a on the voids 2a of the substrate 1 will be described in more detail with reference to Figs.

Fig. 9 is a cross-sectional view of the MLCC manufacturing method in the "A" part of Fig. 8A and the "A1" part of Fig. 8B in which the internal electrodes are thermally transferred to the second film ribbon from the first film ribbon printed with the spacer. Fig. 10 is a sectional view taken along the line A-A in Fig. 8A and the portion A1-b in Fig. 8B formed by thermally transferring a spacer from the first film ribbon to the second film ribbon, Fig. 2 is a second process diagram of the MLCC production method in Fig.

As shown in the figure, the process of transferring the internal electrode 2 and the spacer 1a printed on the first film ribbon to the second film ribbon is divided into a first process (FIG. 9) and a second process (FIG. 10) Can be performed sequentially.

A first film ribbon F _{1 in} which a plurality of internal electrodes 2 and spacers 1a are alternately repetitively printed and a second film ribbon F _{2 in} which a ceramic dielectric 1 is printed The internal electrodes 2 are thermally transferred from the first film ribbon F ₁ to the ceramic dielectric 1 surface of the second film ribbon F ₂ in a state in which they are vertically aligned to face each other 9b). In this process, one laminate having a laminated structure of the internal electrode 2 and the ceramic dielectric 1 is formed. At this time, on the ceramic dielectric 1 of the second film ribbon F ₂ , a plurality of internal electrodes 2 And air holes 2a having a predetermined size are provided between the internal electrodes 2 (FIG. 9C).

Next, as shown in FIG. 10, the spacers 1a are transferred from the first film ribbon F ₁ (see FIG. 10A) from which the internal electrodes have been removed (some remain) to the second film ribbon F ₂ And thermally transferred to the gaps 2a between the internal electrodes 2 (Fig. 10B). As a result, each of the air gaps 2a between the internal electrodes 2 is filled with the spacers 1a as shown in FIG. 10C, thereby preventing air gap deflection or cracking due to repeated stacking of the stacks in the MLCC manufacturing process It has a structure that can be done.

For reference, the processes described above are continuously performed in a thermal printer, and the laminate of the internal electrode, the ceramic dielectric, and the spacer thus formed is cut into a predetermined length, and then laminated in plural layers as a single layer. Further, the plurality of stacked layers are pressed (for example, by water pressure in water) at a predetermined pressure, cut along a perforated line D (see FIG. 7B) at a constant interval, Termination to complete the final product of the MLCC as shown in FIG. Further, by providing a multi-layered structure of internal electrodes and ceramic dielectrics, the area of the internal electrodes can be increased, thereby increasing the efficiency, i.e., the capacitance, of the MLCC.

FIG. 11 is a view showing an installation state of a thermal transfer printer and film ribbons to be mounted thereon for performing the processes of FIGS. 9 and 10 according to the MLCC manufacturing method of FIG. 8, wherein a first film ribbon F ₁ , (F ₂₎ a ceramic dielectric (1) a first step (Fig. 9a) for transferring the internal electrode (2) on and, the angle between the two film ribbon (F ₂₎ of the internal electrode 2 is transferred onto the A second step (FIG. 10A) for transferring the spacers 1a to the voids 2a can be continuously performed in one thermal transfer printer 20. [

This thermal transfer printer 20 transfers the first film ribbon F _{1 in} which the internal electrode 2 and the spacer 1a are repeatedly and repeatedly printed from the supply core 21 to the winding core 22, So that the second film ribbon F ₂ on which the ceramic dielectric 1 is printed can be drawn out from the lower core 24.

A second film ribbon (F ₁ ) is disposed between the feed core (21) and the winding core (22) so that the printer head (23) can be lifted up and down from the upper part of the first film ribbon the support rollers 25 corresponding to the print head 23 is located a lower portion of the F ₂₎ has to support a heated pressing by the print head (23). It is also possible to provide a predetermined period of time in which a plurality of metal bars are formed along the circumferential surface at a predetermined position between one side of the lower core 24 for supplying the second film ribbon F ₂ , Diameter transfer rollers (also referred to as " spike rollers ") 27 may be provided. The conveying roller 27 serves to draw the second film ribbon F ₂ from the lower core 24 by a predetermined length in the operation stop state of the first film ribbon F ₁ , The film ribbon F ₂ is rolled back to the lower core 24 and the thermal transfer of the internal electrode 2 or the spacer 1a is performed by the print head 23 while the second film ribbon F ₂ ). The reference numeral 26 denotes a 'press roller' that presses the second film ribbon. The transport distance measurement of the second film ribbon F ₂ according to the driving of the transport roller 27 is performed by the transport roller 27 And the pitch of the teeth formed along the circumferential surface of the conveying roller.

FIGS. 12 to 15 illustrate operation states of each step for manufacturing the multilayer ceramic capacitor (MLCC) of the present invention in the thermal transfer printer configuration of FIG. 11, And FIGS. 14 and 15 are views showing first and second operation steps for performing the second process of FIG. 10A.

The first film ribbon F ₁ and the second film ribbon F ₂ are positioned so as to face each other under the printer head 23 and the heat pressing of the printer head 23 internal pressing) the internal electrode 2 and the spacers (1a) of the surface of said first film ribbon (F ₁₎ are respectively the thermal transfer and the second film ribbon (F ₂₎ to the top of ceramic dielectric (1) on the surface of the electrode ( 2 and the ceramic dielectric 1 are formed. The operation of the thermal printer 20 for forming such a laminate will now be described.

First, the conveying roller 27 is driven to draw the second film ribbon F ₂ by a predetermined length as shown in FIG. At this time, the first film ribbon F ₁ and the print head 23 remain stationary. Next, the first film ribbon F ₁ is moved from the feed core 21 (FIG. 11) to the winding core 22 while the winding core 22 (FIG. 11) is driven as shown in FIG. 13, At the same time, the lower core 24 is rolled back and the second film ribbon F ₂ is recovered. In this process, while the print head 23 is descending, the inner electrodes 2 on the surface of the first film ribbon F ₁ Heat-presses the second film ribbon F ₂ onto the surface of the ceramic dielectric 1.

Next, the transporting roller 27 is driven to draw out the second film ribbon F _2-1 on which the internal electrodes 2 have been printed by a predetermined length as shown in Fig. At this time, the gap 2a between the internal electrodes 2 printed on the second film ribbon F _2-1 and the spacers la on the surface of the first film ribbon F _1-1 correspond to the positions , And the first film ribbon (F _1-1 ) and the print head 23 remain stationary.

Next, as shown in Fig. 15, while the winding core 22 is driven, the first film ribbon F _1-1 moves from the feeding core 21 to the winding core 22, and at the same time, The second film ribbon F _2-1 is recovered while the print head 23 rolls back and the spacers 1a of the surface of the first film ribbon F _1-1 are heated pressing to thereby use the thermal gap (2a) between the second ribbon film (F _2-1) the internal electrode 2 is printed on.

According to such a method, the present invention can prevent edge collapse of the electrode by providing a spacer in the pores between the respective internal electrodes in the laminate composed of the internal electrode and the ceramic dielectric.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, It will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

1: Ceramic dielectric
1a: Spacer
2: internal electrode
2a: air gap
10, 20: Thermal printer
11, 21, 14: Supply core
12, 22, 15:
24: Lower core
13,23: Printer head
17: Supply roll
27: Feed roller
F ₁ : First film ribbon
F ₂ : Second film ribbon
a, d:
b, e: base PET film layer
c: back coating layer
B: deflection line
C: Crack
D: perforated line

Claims (10)

As an MLCC manufacturing method for increasing the efficiency of an MLCC,
A step of laminating internal electrodes on the ceramic dielectric by thermal transfer to form a laminate of a predetermined standard,
And a step of repeatedly laminating a laminated body of a ceramic dielectric and an internal electrode according to the above process so as to increase the total area of the internal electrodes. The method according to claim 1,
Wherein the step of forming the laminate comprises:
Transferring the thermal transfer film on which the internal electrode is printed from the feed core to the take-up core, and transferring the thermal transfer film on which the ceramic dielectric is printed from the feed core to the take-up core in opposition thereto; And
And thermally transferring the internal electrode of the film surface onto the ceramic dielectric of the film surface by heat pressing of the print head to form a thermal transfer film having a laminate of a ceramic dielectric and an internal electrode. The method according to claim 1,
Wherein the step of forming the laminate comprises:
Further comprising providing a ceramic dielectric as a spacer by thermal transfer on each of the gaps between the internal electrodes stacked on the surface of the ceramic dielectric. The method according to claim 1,
Wherein the step of forming the laminate comprises:
A first step of transferring the internal electrodes from the first film ribbon onto the ceramic dielectric of the second film ribbon; and a step of transferring the spacers from the first film ribbon to the respective internal electrodes between the internal electrodes transferred to the second film ribbon And the second step is performed continuously in one thermal transfer printer. 5. The method of claim 4,
The thermal transfer printer transfers the first film ribbon, which is alternately repetitively printed with internal electrodes and spacers, from the feed core to the winding core, and the second film ribbon on which the ceramic dielectric is printed correspondingly is taken out from the lower core and rolled the print head is vertically liftable from the upper portion of the first film ribbon and the lower portion of the second film ribbon drawn out from the lower core is positioned between the feed core and the winding core, Wherein a support roller corresponding to the print head is positioned to support the printhead. 6. The method of claim 5,
And a conveying roller having a plurality of teeth formed along a circumference between the lower core and the supporting roller, wherein the conveying roller conveys the second film ribbon from the lower core by a predetermined length in an operation stop state of the first film ribbon And the second film ribbon is rolled back to the lower core to guide the second film ribbon while thermally transferring the internal electrode or the spacer by the print head. . ≪ / RTI > 7. The method according to any one of claims 1 to 6,
The inner electrode is printed on one side of the base PET film layer, a release agent layer is formed between the inner electrode and the base PET film layer, and the base PET film layer is formed on the other side of the base PET film, And a back coating layer of a predetermined material having a predetermined slip property is printed so as to improve the printing quality by smoothly moving the film during printing. 7. The method according to any one of claims 1 to 6,
Wherein the ceramic dielectric is printed on one side of the base PET film layer and a release agent layer is printed between the ceramic dielectric and the base PET film layer. 8. The method of claim 7,
Wherein the internal electrode comprises a binder that increases the adhesion of the internal electrode to the silicon dielectric layer in comparison to the bond strength with the release agent layer, and wherein the binder is completely burned through a binder burnout process. An MLCC having a structure of a laminate of internal electrodes and a ceramic dielectric according to the method of claim 1, wherein a spacer is provided in each gap between the internal electrodes according to the method of claim 3.

Images