JPS6178114A - Manufacture of laminated ceramic capacitor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a method for manufacturing a multilayer ceramic capacitor,
In particular, it relates to a method of printing internal electrodes.

(Prior art) The conventional printing method for internal electrodes of multilayer ceramic capacitors is the 1st rS! The method shown in FIG. 2 is made by using a printing screen 4 that is masked except for the rectangular pattern l having the same shape as the internal electrode on the screen 2 in which the mesh-like sheet shown in J(al, (b)) is stretched over the frame 3. (A low viscosity conductive paste 5 consisting of a mixture of conductive gold JLA powder, binder and solvent such as silver palladium etc. is applied to ceramic green 7.
- Pass the rectangular pattern l onto the tray 7 using the squeegee 6, extrude it into a polar shape and print it, then dry it with hot air using the dryer 8 to solidify it for long-term storage, as shown in Figure 3. A method of forming a pattern 25 of internal electrodes has been used. However, in such a conventional method, the binder contained in the ceramic green sheet 7 is easily interpreted as the solvent in the conductive paste 5, so when the thickness of the green sheet 7 is thin.

In some cases, the green sheet 7 was deformed.

For this reason, the above-described conventional printing method has the disadvantage that it becomes a major hindrance in reducing the thickness of the electrically binding body of a multilayer ceramic capacitor.

(Objective of the Invention) An object of the present invention is to provide a method for manufacturing a multilayer ceramic capacitor that eliminates such conventional drawbacks.

(Structure of the Invention) According to the present invention, conductive metal powder of silver or palladium, thermoplastic resin, and charge control agent are made into powder through the steps of melting, mixing, solidifying, pulverizing, and sizing.

A method for manufacturing a multilayer ceramic capacitor is obtained which includes a step of printing this powder onto a green sheet by electrostatic printing as an internal electrode material of the multilayer capacitor.

(!I! Example> Hereinafter, an example of the present invention will be described with reference to FIGS. 4 to 10.

Figure 4 shows the charging process, and shows the conductor 1! of a copper plate, etc. Note Support 1
A photoreceptor 1412 made of a photoconductive material such as cadmium sulfide (CaS) is bonded and formed on top of the photoreceptor 1412, and an insulating layer 11 is further laminated thereon to generate a corona discharge on the upper surface of the photoreceptor 10 on which the acid upper surface is formed. A charging process is performed using the container 15 to uniformly charge the substrate to a positive or negative polarity. Next is the non-transparent interior as shown in Figures 5 and 6! A printing screen 24 on which a pattern 21 having the same shape as the pole is formed on a transparent film 9 is placed on the top surface of the photoreceptor 10 that has undergone the above-mentioned charging process, and an ultraviolet edge lamp or the like is placed above the printing screen 24. An exposure step is performed in which the light source is illuminated from the base 16 and exposed through the printing screen 24 (FIG. 7). At this time, the line light portion of the photoreceptor 10 has a pattern 21 having the same shape as the internal electrode, and a static image having the same shape as the pattern 21 having the same shape as the internal electrode. 14 is obtained. Next, as shown in FIG. 8, fit the photoreceptor 10 into the upper opening 20iC of the box-like body 19 with the Seidensen 1#14 facing down.
Development in which powder 17, which will be described below, is sprayed onto the upper electrostatic latent image 14 using an air nozzle 18 fitted into a through hole in the side surface of the box-shaped body 19 to adhere to the electrostatic latent image 14 above, and the silent IL latent image 14 is developed. Perform the process. This powder 17 is a mixture of conductive metal powder such as silver palladium, thermoplastic resin, and charge control agent.
It is made into a powder through the steps of cooling, solidifying, pulverizing, and sizing, and is formed so that it becomes negatively or positively charged when rubbed with a charge control agent. If the photoreceptor 10 is charged in such a way that the polarity of the charged charge is opposite to that of the powder 17, when the powder 17 is blown out from the nozzle 18, the friction ring with the nozzle 1B and the mutual contact between the powder 17 Due to abrasion, the electrostatic charge is charged to a polarity opposite to that on the photoreceptor 10, and is electrically attached to the electrostatic latent image 14 on the photoreceptor 10. Next, green 7 is applied to the powder adhesion surface of the photoreceptor 10 that has undergone the development process.
- The green sheet 7 is stacked on top of the green sheet 7, and then the green sheet 7 is charged with the opposite polarity to the powder 17 using a corona discharge generator 15, and the photoreceptor 10 is
A transfer step is performed to transfer the upper powder 17 onto the green plate 7 (FIG. 9). Next, the powder 17 on the green sheet 7 that has undergone the transfer process is passed through the green sheet 7 between a pair of upper and lower heating rolls 22 and pressure rolls 23, subjected to thermal pressure and melting treatment, and fixed to the green sheet 7 in a fixing process. This process forms an internal electrode pattern 25 that can be stored for a long time.

A green sheet 17 on which an internal electrode pattern 25 is formed through the above-mentioned charging, exposure, development, transfer, and fixing steps.
A laminated ceramic capacitor element is obtained through the known conventional steps of laminating, pressing, cutting, and sintering.

(Effects of the Invention) As described above, the method for printing internal electrodes according to the present invention uses a powder that does not contain a solvent as a paste, so there is no risk of deformation of the green sheet during printing. A multilayer ceramic capacitor using the above method can be manufactured.

Therefore, the effect of reducing the size and increasing the capacitance of the capacitor element is tremendous.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are used in the conventional example. A front view and a side view showing a printing screen IJ-. Figure 2 and w
Figure J3 is a side cross-sectional view showing a conventional internal electrode printing method. 5 and 6 are a front view and a side view showing a printing screen used in an embodiment of the present invention. It44 and FIGS. 7 to 10 are side sectional views showing a method of printing internal electrodes according to an embodiment of the present invention. 1.21... Pattern with the same shape as the internal electrode,
2...Screen, 3...Frame, 4,2
4... Printing screen% 5... Conductive paste, 6... Squeegee, 7... Green sheet, 8... Dryer, 9... ...
...Translucent film, 10...Photoreceptor, 11
...Insulating layer, 12... Photosensitive layer, 13.
... Conductive support, 14 ... Electrostatic IV image, 15 ... Corona discharge generator, 16 ...
- Light source, 17... Powder, 18... Nozzle, 19... Box-shaped body, 20... Upper opening of box-shaped body, 22...・・・Heating roll, 23...
...Pressure roll. 25...Polar pattern inside. Fig. 2 Fig. 3 Fig. 4 Fig. 14 Fig. 7 Concave cow Fig. 8 - Dimensions

Claims (1)

[Claims] A multilayer ceramic capacitor comprising the step of powdering a conductive metal powder plastic resin and a charge control agent, and then printing the powder onto a green sheet by electrostatic printing as an internal electrode material of the multilayer capacitor. manufacturing method.