JPH02267920A - Chip type electrolytic capacitor - Google Patents

Abstract

PURPOSE:To improve the yield and the production efficiency at the time of manufacturing by constituting the columnar type part of a resin case accommodating a capacitor main body, in a taper type wherein the bottom part is narrowed, and the aperture part is wide and slightly larger than the diameter of the capacitor main body. CONSTITUTION:The columnar part 13c of a resin case 13 accommodating a capacitor main body 13 is constituted in a taper shape wherein the bottom part is narrowed and the aperture part is made wider and larger than the diameter of a capacitor main body by 0.05mm or more. When a chip type electrolytic capacitor is manufactured, the chattering of a product can be eliminated, because the bottom part diameter of the columnar part 13c of the resin case 13 accommodating the capacitor main body 11 is almost equal to the diameter of the capacitor main body 11. Since the diameter of the aperture is larger than that of the capacitor main body 11 by 0.1-0.2mm, the capacitor main body 11 does not collide with the resin case 13 at the time of manufacturing. Thereby the yield and the production efficiency at the time of manufacturing can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a chip type electrolytic capacitor.

2. Description of the Related Art Conventional chip-type electrolytic capacitors have structures as shown in FIGS. 3 and 4 (a) and (b). That is, an anode foil 6 with a roughened surface and a dielectric film formed by anodic oxidation and a cathode foil 7 with a roughened surface are wound through a separator 8 such as paper, and a driving electrolyte is applied. is impregnated to form a capacitor element 1, this capacitor element 1 is housed in a metal case 2, and sealed using an elastic sealing body 3 such as rubber to form an electrolytic capacitor,
The lead wire 4 drawn out from the capacitor element 1 has a rectangular shape when projected from above, and the housing part of the capacitor body is about 0.2 mm larger than the outer diameter of the capacitor body, and the columnar direction of the inner wall of the housing part of the capacitor body The lead was placed in a resin case 5 having a long protrusion on the bottom, and the lead pulled out from the lead through hole 5a arranged at the bottom of the resin case 5 was bent and placed so that it could be soldered to a printed circuit board. .

Problems to be Solved by the Invention However, the chip type electrolytic capacitor having the shape shown in the conventional example does not have a dimensional clearance between the outer diameter of the capacitor body and the substantial inner diameter of the opening of the resin case. Inserting the resin into the resin case has the disadvantage of lowering yield or production efficiency.

The present invention has been made to solve these conventional drawbacks, and aims to provide a chip-type electrolytic capacitor at a low cost, which can improve manufacturing yield or production efficiency.

Means for Solving the Problems To achieve this object, the present invention provides that the cylindrical part of the resin case that houses the capacitor body has a narrow bottom (
This is a chip-type electrolytic capacitor with a tapered opening having a wide opening (at least 0.05 mm larger than the diameter of the capacitor body).

In the chip-type electrolytic capacitor constructed as described above, the cylindrical part of the resin case that houses the capacitor body has a tapered shape with a narrow bottom and a wide opening larger than the diameter of the capacitor body by at least 0.05n++a. This is a chip-type electrolytic capacitor that can improve yield during manufacturing or improve production efficiency.

Example Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 and 2, 11 is the capacitor body, which is made of high-purity aluminum foil with an electrochemically roughened surface.
Thereafter, an anode foil formed by anodizing to form a dielectric film and a roughened cathode foil are wound through a separator, and the wound material is impregnated with a driving electrolyte to form an element. ,
This capacitor element is housed in a metal case and fixed with a sealing rubber, and a lead wire 12 is connected to the anode foil and cathode foil of the capacitor element and is pulled out from the same end face, thereby causing the capacitor body to is configured. Reference numeral 13 denotes a resin case for fixing the capacitor body 11 in a horizontal position, and this resin case 13 is provided with a long protrusion in the columnar direction of the inner wall of the cylindrical part that houses the capacitor body 11 from the bottom to the opening. Furthermore, a through hole 13a through which the lead wire 4 passes is provided. Further, the through hole 1 is provided on the outer surface of the resin case 5.
A recess 13b connected to the through hole 13 is provided.
The tip end 12a of the lead wire 12 passing through the recess 1
It is bent to fit in 3b.

In this case, the tip end 12a of the lead n12 may be flattened and bent, or may be a round bar lead wire.

Next, in the chip-type electrolytic capacitor according to the embodiment of the present invention, as shown in FIGS. (0.05 from the diameter of the capacitor body
It is arranged in a tapered shape larger than WR, and the other component materials and the manufacturing method of the chip type electrolytic capacitor are exactly the same as the conventional example.

To give a detailed explanation of the manufacturing state of the above chip type electrolytic capacitor, when inserting the capacitor body 11 into the resin case 13, the inner diameter of the cylindrical portion 13c of the resin case 13 that accommodates the capacitor body 11 is as follows. Capacitor body 1 if it is not larger than the outer diameter of capacitor body 11
1 into the resin case 13 is impossible. For this reason, the inner diameter of the storage portion of the resin case 13 that stores the capacitor body 11 is made larger than that of the capacitor body 11. Due to the difference in the capacitor body 11 and resin case 1 after assembly,
However, when inserting the capacitor body 11 into the resin case 13, the capacitor body 1
The protrusion at the opening of the storage section 1 hits the capacitor body 11, resulting in a decrease in yield or production efficiency. However, when manufacturing the chip type electrolytic capacitor according to the embodiment of the present invention, the diameter of the cylindrical portion 13c of the resin case 13 that accommodates the capacitor body 11 is approximately the same as the diameter of the capacitor body 11 at the bottom. Therefore, there is no play in the product. Also, the diameter of the opening is
Since the capacitor main body 11 and the resin case 13 are made larger by about 0.1 to 0.2 ms+ with respect to the diameter of the capacitor 1, there is no possibility of collision between the capacitor body 11 and the resin case 13 during manufacturing.

As described above, the chip-type electrolytic capacitor of the present invention has no looseness between the capacitor body and the resin case during manufacturing, and the capacitor body and the resin case do not collide (this improves the yield rate or production efficiency during manufacturing. It is possible.

Specific examples of the present invention will be described below.

(Example) As shown in Figure 1(a), φ3×5 with a rating of 16V10μF
III! An electrolytic capacitor with an outer diameter of 11 and a height of 3 and 5
rrm.

Put it in a resin case with width 4rrta + length 6.5m,
A chip-type electrolytic capacitor was created by bending the lead wire. The inner diameter of the bottom of the cylindrical part of this resin case that houses the capacitor body is 3. The opening was tapered to have an inner diameter of 3.2 m+a.

(Conventional example) As shown in Figure 4(a), φ3×5 with a rating of 16V10μF
- An electrolytic capacitor with an outer diameter of 3.5 m in height and 4 m in width.
A chip-type electrolytic capacitor was created by placing it in a resin case with a length of 6.5 mm and bending the lead wires. The inner diameter of the cylindrical part of this resin case that houses the capacitor body is 3.2+m, and the height of the long columnar projection on the inner wall is 0.1m! The protrusions long in the columnar direction have an R-shaped cross section, and are provided at 120 degree intervals at three locations that divide the inner circumference into three equal parts, and are connected to the cylindrical opening in which the capacitor body is housed.

In the example, there was no play between the capacitor body and the resin case during manufacturing, and the openings of the capacitor body and the resin case did not collide (the yield during manufacturing was improved, and production efficiency was improved.

(Table 1) (Table 1) Manufacturing yield and production efficiency with automatic manufacturing machine Effects of the invention As can be seen from the above results, according to the present invention, there is no looseness between the capacitor body and the resin case during manufacturing. The capacitor body and the resin case do not come into contact with each other, and it is possible to improve the yield or production efficiency during manufacturing, and the practical effect is great.

[Brief explanation of drawings]

FIG. 1(a) is a perspective view showing a chip-type electrolytic capacitor according to an embodiment of the present invention, FIG. 1(b) is a perspective view of a resin case of a chip-type electrolytic capacitor according to an embodiment of the present invention, and FIG. Figure (a) is a side view showing a chip type electrolytic capacitor according to an embodiment of the present invention, and Figure 2 (b) is Figure 2 (a).
Figure 3 is an assembly diagram of an electrolytic capacitor, Figure 4 (a) is a perspective view showing a conventional chip type electrolytic capacitor, and Figure 4 (b) is a conventional chip type electrolytic capacitor. FIG. 3 is a perspective view of the resin case of FIG. 11... Capacitor body, 13... Resin case, 13c... Part. Name of agent: Patent attorney Shigetaka Awano and one other person Figure 1 (d) (b) Yoshizu

Claims (1)

[Claims] A capacitor body constructed by housing a capacitor element in a metal case and sealing it using a sealing body, and from which a lead wire connected to the capacitor element is drawn out, and an insulator for fixing the capacitor body in a horizontal position. and a chip shape characterized in that the cylindrical portion of the insulator that accommodates the capacitor body has a tapered shape with a narrow bottom and a wide opening that is 0.05 mm or more larger than the diameter of the capacitor body. Electrolytic capacitor.