JPH02297914A - Electronic component with leads - Google Patents

Abstract

PURPOSE:To enhance mounting reliability and to reduce a height after mounting by so selecting the length from the extension of a lead to an adhered part that the adhered part is disposed at the other main face side of a mounting board. CONSTITUTION:When leads 13 are inserted from one main face 21 of the through hole 20 of a printed board 19 in which an electronic component 11 with leads are mounted, the length of the extension 15 of the lead of a lead terminal 14 to an adhered part 16 is so selected that the part 16 is disposed at the other main face 22 side of the board 19. When the position of the part 16 is 2mm or less from the face 22 of the board 19, it is effective. After the terminal 14 is clinched to be cut and the part 16 is removed, it is connected to the land of the board 19 with solder 23. Since the adhered part does not remain at the body side of the component, its mounting reliability is improved, and the component is approached to the main face to reduce its height.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a leaded electronic component including a plurality of leads extending in the same direction and parallel to each other from a component body. The present invention relates to an electronic component with a lead, which includes a lead terminal portion drawn out from the lead terminal portion and a lead extension portion joined to the tip end portion of the lead terminal portion.

[Prior Art] Some electronic components with leads include a plurality of leads extending in the same direction and parallel to each other from a component body (a "radial lead type" or a "parallel lead type").

These types of leaded electronic components are often held in a form in which a large number of them are distributed and held at equal intervals on a tape via leads, in order to facilitate handling such as mounting on a circuit board. Taped to remove. In order to make electronic components taped in this manner applicable to a mounting machine, the leads cannot be shortened, and the lead length must be at least 16 to 20 mm, for example.

By the way, an example of an electronic component with leads that is taped as described above is a trimmer capacitor. An element made of a metal plate to be formed is inserted into a mold for molding a resin molded portion, thereby obtaining a structure in which leads are drawn out from the component body. The element made of a metal plate that partially constitutes the lead described above is extracted by punching out a single metal plate.

Therefore, when the length of the lead is increased, the number of elements that can be extracted from a given area of the metal plate decreases, thereby increasing the cost required for the elements. Furthermore, in this case, the number of elements that fit into a mold of a certain size is reduced, which reduces the number of parts obtained in one molding process, and therefore increases molding costs. do.

Against this background, conventionally, in electronic components with leads that are taped, each lead can be made to a desired length by joining a lead extension to a relatively short lead terminal drawn out from the component body. It was supposed to be the same.

FIG. 8 shows the mounted state of such a leaded electronic component. Referring to FIG. 8, a leaded electronic component 1, such as a trimmer capacitor, has a component body 2,
For example, two leads 3 are provided that extend from the component body 2 in the same direction and parallel to each other. Each of the leads 3 includes a lead terminal portion 4 drawn out from the component body 2 and a lead terminal portion 4.
The lead extension part 5 is joined to the distal end portion of the lead extension part 5.

The lead 3 is inserted into a through hole 7 provided in a printed circuit board 6.
After insertion, it is clinch-cut and connected to conductive lands (not shown) formed on the printed circuit board 6 by solder 8.

[Problems to be Solved by the Invention] As can be seen from the mounted state of the electronic component 1 with leads shown in FIG. 8, the leads 3 are inserted into the through holes 7 from one main surface side of the printed circuit board 6. At this time, the joint portion 9 between the lead terminal portion 4 and the lead extension portion 5 remains on one main surface side of the printed circuit board 6. Therefore, after mounting, for example, when an external force is applied to the component body 2, the joint 9 may be damaged, and there is also a risk that the joint 9 may be corroded due to various environmental changes. I can't hope for it. In addition, the joint part 9
is located on one main surface side of the printed circuit board 6 and on the same side as the component body 2, so a relatively large gap is formed between the component body 2 and the printed circuit board 6, thereby preventing the Another drawback is that the height of the leaded electronic component 1 protruding from the printed circuit board 6 is increased.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an electronic component with leads that has high mounting reliability and can be reduced in height after mounting.

[Means for Solving the Problems] The present invention includes a component body and a plurality of leads extending in the same direction and parallel to each other from the component body, and each of the leads is pulled out from the component body. The present invention is directed to a leaded electronic component comprising a lead terminal portion and a lead extension portion joined to the tip portion of the lead terminal portion, and in order to solve the above-mentioned technical problem, the following configuration is provided. It is characterized by having the following.

That is, the length of the lead terminal portion up to the joint with the lead extension portion is such that when the lead is inserted from one main surface side into the circuit board on which the leaded electronic component is mounted, The circuit board is characterized in that the portion is selected to be located on the other main surface side of the circuit board.

[Operation] According to the present invention, when the lead is inserted into the circuit board from one main surface side, the joint portion is located on the other main surface side of the circuit board. The joint portion located on the other main surface side of the circuit board is usually removed from the leads when the circuit board is clinch cut.

[Effects of the Invention] Therefore, according to the present invention, no bonding portion remains on the side of the circuit board where the component body is located, so that the reliability of mounting the leaded electronic component is improved.

In addition, since the leads are inserted so that the joint part is located on the other main surface side of the circuit board, the component body can be placed close to one main surface of the circuit board, and the electronic component with leads can be placed close to the other main surface of the circuit board. height can be reduced.

Furthermore, the joint can be removed in the mounted state, so that electrical connection between the leaded electronic component and the circuit board is achieved only by the lead terminal portion pulled out from the component body. Therefore, there is no characteristic deterioration such as an increase in contact resistance due to the presence of the joint.

Furthermore, as described above, the joint can be removed after the leaded electronic component is mounted, so the joint can maintain the mechanical connection between the lead terminal and the lead extension. Only mechanical strength is required. That is, since reliability of the electrical connection at the joint is not required at all, quality control of the joint becomes easy and production efficiency of leaded electronic components can be improved.

[Embodiment] An embodiment of the present invention is shown in FIGS. 1 to 4.

As shown in FIG. 1, the leaded electronic component 11 includes a component body 12 and, for example, two leads 13 extending from the component body 12 in the same direction and parallel to each other. lead 1
3 includes a lead terminal portion 14 drawn out from the component body 12, and a lead extension portion 15 joined to the tip portion of the lead terminal portion 14.

The shape of the joint 16 between the lead terminal portion 14 and the lead extension portion 15 is shown enlarged in FIG. In this embodiment, a stepped portion 17 is formed at the upper end of the lead extension portion 15, and a bent portion 18 is formed below the stepped portion 17.
is formed. The lower end of the lead terminal portion 14 has a stepped portion 17.
The position is determined by contacting the When the lead extension part 15 is made of metal like the lead terminal part 14, the lead terminal part 14 is in the positioning state described above.
and lead extension 15 are welded at joint 16 . In such a joined state, the above-mentioned bent portion 18
The presence of the lead terminal portion 14 and the lead extension portion 15 allows the respective center lines of the lead terminal portion 14 and the lead extension portion 15 to be located on the same or approximately the same line.

In this embodiment, the lead extension part 15 is joined to the lead terminal part 14 from the inside, but it may be joined from the outside.

Referring again to FIG. 1, the length of the lead terminal portion 14 to the joint portion 16 with the lead extension portion 15 is defined as the length of the lead terminal portion 14 up to the joint portion 16 with the lead extension portion 15. The joint portion 16 is selected to be located on the other main surface 22 side of the printed circuit board 19 when the board 13 is inserted into the hole 20 from the one main surface 21 side.

Next, as shown in FIG. 3, the lead terminal portion 14 of the lead 13 is clinch-cut to remove the joint portion 16. In order to perform the lynch cut without any trouble, the position of the joint 16 in the state shown in FIG.
．． It is preferable that the distance is 0 mm or more.

The clinch-cut lead terminal portion 14 is attached to a conductive land (
(not shown).

Note that, as shown in FIG. 1, when the lead 13 is inserted into the through hole 20, it is necessary that the joint portion 16 passes through the through hole 20 reliably. However, this can be easily achieved by making the shape of the vicinity of the connecting portion 16 as shown in the enlarged view in FIG. 2, or by appropriately setting the size of the through hole 20. . Through hole 2
Regarding the size of 0, it has been confirmed that if the inner diameter is approximately 1.2 times the largest diameter portion of the lead 13, the lead 13 can be passed through the joint 16 without any problem.

FIG. 4 shows a state in which a plurality of leaded electronic components 11 are taped together. When the leaded electronic component 11 is taped, the lead extension 15 of the lead 13 is placed on the holding tape 24, and an adhesive tape 25 is attached to the holding tape 24 to fix the state. . Note that feed holes 26 are provided at equal intervals so as to penetrate through the holding tape 24 and the adhesive tape 25.

FIG. 5 shows a leaded electronic component 11a as another embodiment of the invention. The leaded electronic component 11a shown here is only slightly different from the leaded electronic component 11 described above in the shape of the lead extension portion 15a. That is, the lead extension portion 15a has a bent portion 18a.
is formed, but the step 17 clearly shown in FIG. 2 is not formed. Other points are similar to the leaded electronic component 11, so corresponding parts are given the same reference numerals and redundant explanations will be omitted.

FIG. 6 shows a leaded electronic component 11b as still another embodiment of the invention. This leaded electronic component 11b differs from the leaded electronic component 11 shown in FIG. 1 only in the shape of the lead extension portion 15b.

That is, the lead extension portion 15b has no curved portion or stepped portion, and simply extends in a straight line.

Note that also in each of the embodiments shown in FIGS. 5 and 6, the lead extension portion 15a or 15b is connected to the lead terminal portion 14.
Although it is joined from the inside to the outside, it may be joined from the outside.

As a further embodiment of the present invention, the lead terminal portion 14 may be made shorter than the leaded electronic component 11 shown in FIG. 1, for example. FIG. 7 shows a mounted state of such a leaded electronic component 11c. Referring to FIG. 7, if lead terminal portion 14c is formed of, for example, a thin plate material, a cutting error may occur during clinch cutting depending on the type of mounting machine. In this case, if the joining part 16 between the lead terminal part 14c and the lead extension part 15c is selected as the cutting position, the thickness of the cut part will increase and the cutting performance will be improved. At this time, a portion of the joint portion 16 and the lead extension portion 15c remain on the other main surface 22 side of one printed circuit board, but the lead terminal portion 14c is securely connected to the solder 2.
3, connection reliability is not an issue.

Although the invention has been described above in connection with several illustrated embodiments, several other variations are possible within the scope of the invention.

For example, although welding is disclosed in the above-mentioned embodiments as the joining method employed for the joining portion 16, the portion of the lead terminal portion and/or the lead extension portion located at the joining portion is
For example, if it is plate-shaped, it is possible to form a joint by caulking it. Since the joint does not require an electrical connection, other strong joining methods are also possible.

In addition, since the lead extension does not directly contribute to the electrical connection of the leaded electronic component, this part should be replaced with a non-conductive material.
For example, it may be made of resin or the like.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a leaded electronic component 11 as an embodiment of the present invention, and also shows a printed circuit board 1.
9 is shown in cross-section. FIG. 2 is an enlarged view showing the structure of the vicinity of the joint 16 between the lead terminal portion 14 and the lead extension portion 15 shown in FIG. FIG. 3 is a front view showing a state in which the leaded electronic component 11 shown in FIG. 1 has been clinch cut. FIG. 4 shows an electronic component 11 with leads.
FIG. FIG. 5 is a front view showing a leaded electronic component 11a as another embodiment of the present invention. FIG. 6 is a front view showing a leaded electronic component 11b as still another embodiment of the present invention. FIG. 7 is a front view showing a mounted state of a leaded electronic component 11c as still another embodiment of the present invention. FIG. 8 is a front view showing a conventional leaded electronic component 11 mounted on a printed circuit board 6. As shown in FIG. In the figure, 11. 11 a, 1 l b,
11c is an electronic component with a lead, 12 is a component body, 13 is a lead, 14 and 14c are lead terminal parts, and 15.15a. 15b and 15c are lead extensions, 16 is a joint, 19 is a printed circuit board (circuit board), 20 is a through hole, 21 is one main surface, and 22 is the other main surface. Figure 1 Figure 3 Figure 2 Figure 7 Figure 5 Figure 6 Figure 8 Procedural Amendment 1999 6J"12'7

Claims (1)

[Scope of Claims] A component body and a plurality of leads extending in the same direction and parallel to each other from the component body, each of the leads having a lead terminal portion drawn out from the component body, and a plurality of leads extending from the component body in the same direction and parallel to each other. In a leaded electronic component, the leaded electronic component is provided with a lead extension part that is joined to the tip of the terminal part, and the length of the lead terminal part to the joint part with the lead extension part is the length of the leaded electronic component when the leaded electronic component is mounted. 1. An electronic component with a lead, characterized in that when the lead is inserted into the circuit board from one main surface side, the joint portion is located on the other main surface side of the circuit board.