JPH0756856B2 - Cap electrode with holding part and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides a convenient holding method when attaching an electronic component such as a resistor, a capacitor, a semiconductor element or a chip type jumper wire to a cap electrode. The present invention relates to a cap electrode with a section and a method for manufacturing the same.

[Conventional technology]

Attachment of electronic components in the conventional example will be described with reference to FIGS. 2 to 5.

FIG. 2 is an explanatory view of mounting a rectangular electronic component in a conventional example. In FIG. 2, reference numeral 21 is a rectangular electronic component element body, and rectangular cap electrodes 22 are connected to both ends thereof. Also the circuit board
An electrode land 24 forming a part of a wiring pattern (not shown) is formed on 23, and the rectangular electronic component 20 is placed on the electrode land 24 by an automatic assembly machine. When the flow or reflow soldering process is performed, the square cap electrode 22 and the electrode land 24 are electrically and mechanically connected by the solder 25.

FIGS. 3A and 3B are explanatory views of a rectangular cap electrode in the conventional example. The plate body 31 having the shape as shown in FIG. 3 (a) is squeezed several times by a square die. After that, the open end is trimmed to form the square cap electrode 22 as shown in FIG. Then, from the open portion 33 of the rectangular cap electrode 22, the rectangular electronic component body 21
(See FIG. 2) and then electrically and mechanically connected.

However, the square cap electrode 22 has a problem that the cost is high because it is necessary to perform a multi-stage aperture on a portion having a small shape. In addition, if there is a slight variation in the working accuracy of the rectangular cap electrode 22, there is a drawback in that the rectangular electronic component element body 21 may be difficult to insert, or may easily fall off.

FIGS. 4 (a) and 4 (b) are explanatory views of another rectangular cap electrode in the conventional example. The structure shown in FIG. 4 is designed to eliminate the above-mentioned defects. After forming the cross plate 41 as shown in FIG. 4 (a), the cross plate 41 is folded at a right angle according to the dotted line. As shown in FIG. 4 (b), the contact part 44 is formed by bending the side ends of the bent part,
It becomes the rectangular cap electrode 42. In this case, if the thickness of the cross plate body 41 is reduced, the frictional force between the rectangular electronic component element body 21 and the rectangular cap electrode 42 is weak, and not only the electrical connection between them is weak, but also the mechanical strength is low. weak. On the contrary, when the thickness of the cross plate 41 is increased, the strength of the rectangular cap electrode 42 and the frictional force between the rectangular electronic component element body 21 and the rectangular cap electrode 42 are increased, but the material and the processing cost are high. Has the problem of becoming.

FIGS. 5 (a) and 5 (b) are explanatory views of other rectangular cap electrodes in the conventional example.

This embodiment is intended to further increase the attachment strength between the rectangular electronic component body 21 and the rectangular cap electrode 42 shown in FIG. 4 and to reduce the processing cost. That is, the cross plate body 48 has a shape in which four corners of the cross plate 48 are provided with a flesh portion 49 for a drawn portion 46 formed by drawing, and is pressed by a mold (not shown), as shown in FIG. A square cap electrode 45 having a desired shape is obtained.

The rectangular cap electrode 45 formed in this manner is formed with a contact portion 47 that abuts on the adjacent side end portion near the open portion 43, and in the portion closer to the bottom than the open portion 43, A narrowed portion 46 is formed in which the side ends of the cross plate 48 are continuous.

The narrowed portion 46 shown in FIG. 5B depends on the cross-sectional area of the square cap electrode 45, but is approximately half of one side of the square cap electrode 45.
When it is set to about 1/3, the square cap electrode 45 can be narrowed down by pressing the die once.

As another conventional technique, for example, Japanese Patent Application No. 53-8767.
There is a microfilm of No. 8 and a microfilm of Japanese Utility Model Application No. 55-143948.

The split cap shown in the microfilm of the above-mentioned Japanese Patent Application No. 53-87678 has a hemispherical projecting portion formed in the central portion in the vicinity of the outer peripheral edge of a plurality of arcuate projecting pieces. Is bent along the outer peripheral surface of the electronic component body to form a bottomed tubular body. And, the hemispherical protrusion,
It is attached by its elasticity without applying an unreasonable force to the electronic component body.

The electric field capacitor shown in the microfilm of Japanese Utility Model Application No. 55-143948 described above has a space between the cap electrode of the bottomed cylindrical body and the electronic component element body, and then the opening of the cap electrode. The cap electrode and the electronic component element body are connected by crimping the edge portion inward.

[Problems to be Solved by the Invention]

The rectangular electronic component 20 has a large mounting area as compared with the round electronic component, and has good stability during installation.

However, as the rectangular or round electronic component is further miniaturized, the contact area between the electronic component element body and the cap electrode becomes smaller. Therefore, there is a problem that the electronic component element body comes off from the cap electrode.

Further, in order to reduce the number of manufacturing steps, the cap electrode has a roughened peripheral surface when the number of times of drawing of the mold is reduced. Then, when coating such as solder plating is applied to the peripheral surface portion having such a rough surface, there is a problem that the coating is peeled off from this portion.

Further, if a holding portion or the like is provided on the cap electrode so that the electronic component body does not drop off from the cap electrode, there is a problem that the number of manufacturing steps for that is increased.

The hemispherical projection for improving the connection between the cap electrode and the electronic component element body is convenient for preventing the electronic component element body from dropping off from the cap electrode. However, the electrical connection between the cap electrode and the electronic component element body is not always good, and when the electronic component element body is miniaturized, it becomes difficult to process the hemispherical protrusions. Have.

Also, if the cap electrode is made larger and the electronic component element body is inserted and then the opening edge of the cap electrode is caulked inward, if the electronic component element body is miniaturized, a machine for caulking will be used. If it is not precise, there is a problem that the electronic component body is damaged.

The present invention is for solving the above problems,
An object of the present invention is to provide a cap electrode with a holding portion for preventing the electronic component body from falling off from the cap electrode.

Another object of the present invention is to provide a method of manufacturing a cap electrode with a holding portion, which is capable of simultaneously obtaining a cap electrode which is hard to peel off a plated coating or the like applied to the cap electrode, and in which an electronic component element body does not drop from the cap electrode. And

[Means for Solving the Problems]

In order to achieve the above-mentioned object, a cap electrode with a holding portion of the present invention is composed of a bottomed cylindrical body having a bottom portion at one end and an opening portion at the other end, and is provided on the bottom side of a peripheral surface extending from the bottom portion to the opening portion. A narrowed portion provided, an abutting portion in which the side end portion of the bottomed cylindrical body is abutted on the peripheral surface opening portion side, an arc portion formed at the end portion of the peripheral surface opening portion, and the arc. And a turn-up part which is a holding part for the electronic component element body by turning a part of the tip end of the part inward.

Further, the manufacturing method of the cap electrode with a holding portion of the present invention,
First step of cutting off the four corners of the disc and forming a cross plate body in which a meat portion for forming a drawing portion remains at the four corners when drawing, and pressing the center of the cross plate body with a mold Then
Of the peripheral surface extending from the bottom to the open part, the narrowed part on the bottom side,
A second step of forming a bottomed cylindrical body having an abutting portion on the open side, and a holding portion for an electronic component element body in which a part of a tip end portion of an arc portion of the bottomed cylindrical body projects inward. And a third step of forming a turning portion.

Furthermore, in the third step of the method for manufacturing a cap electrode with a holding portion of the present invention, a large number of the bottomed tubular body and a polishing stone having a diameter longer than the length of the diagonal line of the bottomed tubular body are inserted into a container, By rotating and / or vibrating the container,
A part of the arcuate tip end portion in the peripheral surface portion of the bottomed cylindrical body is polished, and the arcuate portion serving as the holding portion is turned inside.

[Action]

At the four corners of the disk, a cross plate body is formed by cutting off so as to leave a meat portion for forming the narrowed portion. Therefore, the tip of each cross portion of the cross plate is an arc. After that, the bottom center of the cross plate is pressed by a mold to form a bottomed cylinder. Since the flesh portions are present at the four corners of the cross plate body, the narrowed portion is formed on the bottom side of the bottomed tubular body. Then, since the four corners of the cross plate body are cut off, a contact portion having side end portions butted against each other is formed on the open portion side of the bottomed tubular body.

The electronic component element body is held by the narrowed portion and the contact portion. The holding force for holding the electronic component element body is determined by the length of the narrowed portion and the contact portion, or the material and thickness of the cross plate body.

Further, the cap electrode and a grinding stone having a diameter longer than the diagonal line of the cap electrode are inserted into the container to rotate and / or vibrate the container together. The polishing stone in the container polishes the tip part on the peripheral surface of the cap electrode to remove the acute angle part and cannot enter the cap electrode.Therefore, part of the arc-shaped tip part of the cap electrode is directed inward. Try to turn it over. That is, the turning-up portion bites the electronic component body to firmly connect with the cap electrode.

Since each peripheral surface portion of the cap electrode in the present invention is appropriately polished when manufacturing the above-mentioned turning-up portion, coating such as solder plating is performed as compared with the peripheral surface portion of the cap electrode manufactured by squeezing with a press. When applied, the paint does not come off.

〔Example〕

The rectangular cap electrode with a holding portion according to the present invention will be described with reference to FIGS.

First, as shown in FIG. 1 (a), when a metal disk (dotted line 5) to be an electrode is drawn at its four corners, the meat portion 4 to be the drawing portion 12 is left and cut off. The tip portion of the cross plate body 1 formed in this manner is an arc portion 3. The height of the arc portion 3 can be adjusted to some extent,
When forming the turn-up portion 14 described later, the arcuate portion 3 formed from the circle drawn by the center point 2 of the cross plate body 1 gave the best result.

Then, the bottom portion 7 of the cross plate body 1 is pressed by a rectangular die (not shown) to form a bottomed cylindrical body.

At this time, since there are meat portions at the four corners of the cross plate 1,
A throttle 12 is formed on the bottom 7 side of the bottomed cylinder. Further, since the four corners of the cross plate body 1 are cut off, the side end portion 9 is butted against the open portion 8 side of the bottomed tubular body so as to contact the contact portion.
Mold 13.

When the rectangular electronic component body not shown is molded and inserted into the rectangular cap electrode 11 as shown in FIG. 1 (b), it is held by the narrowed portion 12 and the contact portion 13. . The holding force for holding the rectangular electronic component element body is determined by the lengths of the narrowed portion 12 and the contact portion 13 or the material and thickness of the cross plate body 1.

Further, in order to improve the holding force between the rectangular cap electrode 11 and the rectangular electronic component element body, the rectangular cap electrode 11 and a diameter longer than a diagonal line of the rectangular cap electrode 11 are provided in a container (not shown). Polishing stones such as silica stone or silica sand
And are inserted to provide rotation and / or vibration (rotation, or vibration, or rotation and vibration). Since the grinding stone has a size that does not enter the inside of the square cap electrode 11 while polishing the ridge portion of the square cap electrode 11 to remove the acute angle portion, It will give a shock from the outside. As a result, a part of the tip portion of the arc portion 3 is turned up only in the inward direction of the rectangular cap electrode 11, and as shown in FIG.
The square cap electrode 15 with a holding portion is provided. The turn-up portion 14 is large at the most protruding portion of the arc portion 3. That is, the turning-over portion 14 bites the rectangular electronic component element body and firmly holds the connection with the rectangular cap electrode 11.

Since there is a space inside the arcuate portion 3, the tip of the arcuate portion 3 causes burrs and humps 14 inwardly due to the impact of the grinding stone, but each ridge line portion of the rectangular cap electrode 15 with a holding portion. Since it is polished, the coating such as solder plating does not come off as compared with the case of an acute angle portion.

Further, the control of the shape or size of the turning-up portion 14 can be changed depending on the type and size of the polishing stone or the processing time.

As described above, the present applicant has focused on the fact that the outer end of the cap electrode is polished with a grindstone, whereas the arcuate tip end portion of the cap electrode has a burr and a curl only inward. . Therefore, the "turning portion" in the present invention refers to a portion in which a part of the tip portion of the burr or the arc portion as described above is slightly inwardly turned up.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. Various design changes can be made without departing from the present invention described in the claims.

For example, when an opening is formed in the bottom of the cap electrode with a holding portion, or a gap is provided in the contact portion, when soldering the square cap electrode and the electrode land of the circuit board,
The solder enters through the openings or the gaps between the contact portions, and can strongly connect the electrode land, the rectangular cap electrode, and the rectangular electronic component element body.

In addition, if the lead wire is caulked from inside the square cap electrode using the hole, the chip type and axial
It becomes a square cap electrode that can be used as a lead type or a radial lead type.

Further, in the embodiment of the present invention, the cap electrode for the rectangular electronic component has been described, but it goes without saying that the cap electrode for the round electronic component can be similarly implemented.

〔The invention's effect〕

According to the present invention, since the arcuate portion is provided at the open tip of the cap electrode and the turn-up portion is formed in a part of this arcuate tip, the turn-up portion can firmly connect the electronic component element bodies. it can.

Further, according to the present invention, a polishing stone larger than a diagonal line of the cap electrode is used to apply an impact from the outside of the arc portion to form a turn-up portion, and at the same time, the peripheral surface portion of the cap electrode is appropriately smoothed. Since it is polished, the coating of solder or the like applied to the cap electrode does not come off.

[Brief description of drawings]

1 (a) to (c) are explanatory views of a cap electrode with a holding portion according to the present invention, FIG. 2 is an explanatory view of mounting a rectangular electronic component in a conventional example, and FIGS. 3 (a) and 3 (b) are conventional examples. 4A and 4B are explanatory diagrams of another rectangular cap electrode in the conventional example,
FIGS. 5 (a) and 5 (b) are explanatory views of other rectangular cap electrodes in the conventional example. 1 ... Cross plate 2 ... Center point 3 ... Arc part 4 ... Flesh part 5 ... Dotted line (straight line) 6 ... Dotted line (circle) 7 ... Bottom part 8 ... Open part 9 ... Side end part 11 …… Square type cap electrode 12 …… Squeezing part 13 …… Abutting part 14 …… Flipping part 15 …… Square type cap electrode with holding part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number for FI Technical location H01G 13/00 391 F 9174-5E (56) References 62-37913 (JP, U) Actually open 55-4577 (JP, U) Actually open 57-66536 (JP, U)

Claims (3)

[Claims] 1. A cap electrode with a holding part, which comprises a bottomed cylinder having a bottom part 7 at one end and an open part 8 at the other end, the cap electrode being provided on the bottom part 7 side of the peripheral surface extending from the bottom part 7 to the open part 8. A narrowed portion 12, an abutting portion 13 in which the side end portion 9 of the bottomed tubular body abuts on the peripheral surface opening portion 8 side, and an arc portion 3 formed at the end portion of the peripheral surface opening portion 8. A cap electrode with a holding part, comprising: a turning part 14 that turns a part of the tip end of the arc part 3 inward and serves as a holding part for an electronic component element body. 2. A first step of cutting off four corners of a disk and forming a cross plate body 1 in which the meat portions 4 for forming a drawn portion 12 remain at the four corners when drawing, and the cross plate. A bottomed cylindrical body having a narrowed portion 12 on the bottom 7 side and a contact portion 13 on the open portion 8 side of the circumferential surface extending from the bottom portion 7 to the open portion 8 by pressing the center of the body 1 with a mold. And a third step of forming a swelling portion 14 that serves as a holding portion for an electronic component element body in which a part of the tip end portion of the arcuate portion 3 of the bottomed cylindrical body projects inward. A method of manufacturing a cap electrode with a holding part, comprising: 3. In the three steps, a large number of the bottomed cylindrical body and a polishing stone having a diameter longer than the length of the diagonal line of the bottomed cylindrical body are inserted into a container, and the container is rotated and / or vibrated. The rectangular cap with a holding part according to claim (2), characterized in that the peripheral surface of the bottomed cylindrical body is polished and part of the tip of the arc part 3 is turned inward. Electrode manufacturing method.