JPS58142520A - Method of producing condenser - 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 of the Invention The present invention relates to a method of manufacturing a fixed capacitor, and particularly to a method of adjusting its capacitance.

(b) Background of the Technology Capacitors are elements that provide electrostatic capacitance, and are widely used as passive components along with inductance and resistance in circuit configurations of electrical equipment.

The capacitor is obtained by drawing out the capacitance obtained by two opposing electrodes through a connecting wire, and various forms are provided. The laminated type that is the subject of this invention is used in the field of relatively small capacity compared to other wound types or electrolytic types, and is usually made of a cylindrical or plate type made of heat-resistant dielectric material and thick on both sides. The main body or plate shape of a capacitor element obtained by forming, for example, a silver electrode using a film formation technique can be obtained by laminating and integrating a plurality of such elements, and then attaching terminals to the electrodes.

((+) Conventional technology and problems Due to its structure, the conventional laminated type condenser has less loose O induction and resistance components than the wound type or electrolytic type condenser, making it the main use of the IIII type and electrolytic type. Due to the high quality of the capacitance precision, it is suitable for energy storage, low frequency R-waves and small capacitance tuning in the relatively high frequency range, phase shifting and other reasons. There is a strong tendency for OII to be required for this high precision requirement.
However, the problem of capacitance selection (★9) was dealt with by means of capacitance adjustment.

FIG. 1 is a sectional view showing the structure of a conventional multilayer capacitor and an embodiment of the present invention. In the figure, l is a dielectric, and 2a, aa*b, and bb are electrodes.

3 is a silver coating, 4 is solder, 5 is a connecting lead wire, and 6 is an anti-coating.

For example, for capacitance adjustment, Figure 2 is an external perspective view showing a conventional capacitance adjustment method for multilayer capacitors (removal S*
Nine electrodes 2a, aa, b are obtained by applying chain paste on both sides of the dielectric 10 and firing as shown in Figure 6).

The area of the facing portion on the innermost outermost surface of bb is reduced by providing a removed portion 11 by grinding by cart-and-try, and the capacitance is adjusted to a predetermined value. Therefore, as the outermost electrodes 2am and 2bb (not shown) are removed, as the area of the removed portion 11 increases, the chance that the underlying dielectric will be damaged due to grinding increases. Since there is an increased possibility that the strength or dielectric strength will decrease, resulting in a decrease in quality, this method, along with other capacitance screening methods, has the disadvantage of decreasing manufacturing yield and increasing costs.

(d) Object of the Invention The present invention eliminates this drawback and provides a means for performing capacitance adjustment while minimizing damage to the underlying dielectric material and performing an efficient electrode removal and reduction operation compared to the conventional method. This is what we are trying to provide.

(・) The structure and purpose of the invention is to form a plurality of capacitor elements in which electrodes made of a thick film such as silver paste are fired on opposite surfaces of a dielectric body according to the present invention, or to laminate and integrate a plurality of capacitor elements. In the multilayer capacitor obtained, - the pattern of single-sided or double-sided thick film electrodes set on the outer surface of the electric body consists of a minimum unit width, where 9 is a plurality of parallel strips with a combination K of the minimum unit width and its integral multiple width. This is achieved by providing a method for manufacturing a capacitor, characterized in that the capacitance of the capacitor is adjusted by selecting the number of cylinders to be removed and/or the dimension to be removed by cutting the parallel strips. I can do it.

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

FIG. 3 is an external perspective view of a multilayer capacitor according to an embodiment of the present invention. However, in FIG. 3, the protective coating shown in FIG. 1 is removed. 01 is a dielectric, 4 is a solder, S#
The connection leads 120a and 120b are strip-shaped electrodes, and except for the outermost electrodes 20a and 20b, the structure is the same as that shown in FIG. 11a and 11b are the same as the conventional one.

As shown in Fig. 3, the conventional electrodes 2am and bb are printed in a continuous pattern of lli by changing the baking of the silver paste. Ill! If the number of tubes to be removed from each electrode 20a, b to be cut by grinding according to the amount of 9 is selected, the area to be removed can be easily counted compared to the conventional method by selecting the size to be removed from the tip.

FIG. 4 is a diagram of the outermost electrode pattern in a multilayer capacitor according to another embodiment of the present invention. By adding n (for example, 4) notches having a narrow pattern width, the electrodes 21a and bl each consisting of 5 block portions are formed. With K in this manner, cutting of the electrodes 21a+b by grinding becomes easier, and by selecting the material of the p1 dielectric 1, efficient capacitance adjustment can be performed using energy beam irradiation such as a laser. The above description assumes that the adjustment electrode surface is only the top surface, and the two surfaces including the bottom surface can be used.Also, two types of electrode pattern shapes can be combined, and if necessary, any one pattern can be used. Furthermore, although the dielectric material was made into a rectangular plate in \\, a parallel strip-shaped electrode pattern can be formed on a disk as well, and even if it is tubular, a parallel strip-shaped electrode pattern can be formed in the axial direction on the outer cylinder. After forming the capacitance, the capacitance can be adjusted in the same way.

(x) As described in detail, according to the present invention, the area of the electrode to be removed on the stationary mold body can be easily and numerically determined in the capacitance adjustment work, so that the electrostatic charge is proportional to the area of the opposing electrode. Capacitance adjustment can be performed more quickly and accurately than conventional cut-and-try repetitions. Cutting the width of parallel strips reduces the area by removing other electrodes, which reduces the mechanical effect on the dielectric material. It is useful because it provides a stable product with less physical and electrical damage.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the structure of a multilayer capacitor according to a conventional method and an embodiment of the present invention. FIG. 3 is a perspective view showing a conventional method for adjusting the capacitance of a multilayer capacitor, and FIG. FIG. 4 is a perspective view of the appearance of a multilayer capacitor and a plan view showing an electrode pattern tube in another embodiment of the present invention. In the figure, 1 is dielectric* 2m, 2mm, 2b
, 2b b, 20 m, 20 b, 21 m and 21b are the electrodes 0 lol 1 m Ning 4 flash

Claims (2)

[Claims] (1) By a capacitor element with a number of beats made by firing electrodes made of a thick film such as Kfli paste on both sides of dielectrics facing each other,
Or, in a multilayer fixed capacitor obtained by laminating and integrating a plurality of such capacitor elements, the pattern of single-sided or double-sided thick film electrodes set on the outer surface of the dielectric has a minimum unit width of t. The capacitor is formed by a plurality of parallel strips with a combination of integral multiple widths, and the capacitance of the capacitor is adjusted by cutting the parallel strips and selecting the number of cylinders to be removed and/or the size to be removed. A method for manufacturing capacitors. (2) In the capacitor manufacturing method described in paragraph (2)-, m on the electrode pattern formed by parallel strips provided on the outer surface of the dielectric material.
Capacitance can be adjusted by providing small parts in several places.