JP2003086969A - Terminal structure of electronic component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal structure of electronic component that can carry out placement machining while a terminal is fitted to a printed board securely and closely. SOLUTION: A strip of metal piece is bent nearly in a U shape, one end is set in a straight shape so that it can be inserted into a printed board, the other is bent inside for composing a terminal 3, and the terminal 3 is fitted to the printed board 1 securely and closely by functioning so that the printed board 1 is sandwiched when the terminal 3 is fitted, thus achieving a terminal structure of electronic component where the junction electrode surface of the terminal 3 becomes flat invariably.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal structure for an electronic component, and more particularly to a technique for easily and accurately mounting a terminal on a printed board in an electronic component.

[0002]

2. Description of the Related Art The mounting of electronic parts has been increasing in density in recent years. Above all, the surface mounting of electronic components has become widespread, and it is required to reduce the height dimension of the electronic components. Here, regarding the structure of the lead terminal of the surface-mounting electronic component, conventionally, the structure is as shown below.

FIG. 5 is a sectional view showing a structural example of a terminal structure of a conventional electronic component. In the terminal structure of the electronic component shown in this example, one side of a terminal 5 formed by bending a strip-shaped metal piece into an L shape is inserted into a through hole 2 provided in a printed board 1 which is a base portion of the electronic component, This is a terminal structure in which a terminal 5 penetrating the through hole 2 and protruding to the opposite surface is soldered and fixed by a solder 4. That is, the terminals 5 serve as lead portions of the electronic component, and when the electronic component is surface-mounted on the printed wiring board 6, the cream solder 7 is applied to a predetermined electrode portion on the printed wiring board 6 and then applied. Terminal 5
Was mounted and heat-treated for mounting.

[0004]

However, the above-mentioned conventional terminal structure for electronic parts has the following problems. FIG. 6 is a diagram for explaining the problem, and FIG. 6 (a) shows a situation in which the terminals 5 are poorly fitted and a gap is left between the printed board 1 and the terminals 5. (B) shows a case where the L-shaped angle of the terminal 5 is widened to cause floating during mounting. That is, there is a problem in that, when the terminal 5 is mounted on the printed board 1 or after the processing is completed, a gap or a lift is generated as described above. As a result, the height of the mounted electronic component becomes high. Further, the flatness of the mounted electronic component is also impaired, and further, it causes a serious defect such as poor conduction and component peeling.

The present invention has been made to solve the above problems, and provides a terminal structure of an electronic component which can be mounted and processed in a state where the terminal is securely and closely fitted to the printed board. The purpose is to

[0006]

In order to solve the above-mentioned problems, the invention of claim 1 of the terminal structure of an electronic component according to the present invention is such that a strip-shaped metal piece is bent into a substantially U-shape, and one end is printed. It is characterized in that it has a straight shape that can be inserted into a plate, and the other end is curved inward.

According to the invention of claim 2 of the terminal structure for an electronic component of the present invention, a printed board having an outer edge inclined at an angle in the thickness direction and a strip-shaped metal piece are bent into a substantially U-shape. One end is a straight shape that can be inserted into a printed board, and the other end is provided with a terminal that is curved inward.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below based on the illustrated embodiments. FIG. 1 is a diagram showing an embodiment of a terminal structure of an electronic component according to the present invention,
(A) is a sectional view, (b) is a plan view, and (c) is a bottom view. The terminal 3 of the electronic component shown in this example is obtained by bending a flat plate (strip) -shaped metal piece into a substantially U-shape so as to have two main bending angles. The part that extends straight is the printed board 1.
It is inserted into the through hole 2 provided in and is fixed by the solder 4 at the penetrating portion. The other end of the terminal 3 extending from the other bent corner is curved inward, and the curved tip portion is formed so as to contact the outer edge portion of the upper surface of the printed board 1. In this way, in the terminal 3 mounted on the printed board 1, the curved tip end fits the printed board 1 by sandwiching the printed board 1 by the elastic action of the leaf spring, so that the bonding electrode surface of the terminal 3 is surely flat.

Next, FIG. 2 is an assembly diagram of a terminal to which a terminal structure of an electronic component according to the present invention is applied, mounted on a printed board. For convenience of explanation, each part of the terminal 3 in FIG. First, as shown in FIG. 2 (a), the curved portion side near the terminal 3 is pushed outward so that the terminal 3 does not get in the way when the terminal 3 is inserted into the through hole 2 of the printed board 1. To do. After that, the portion of the terminal 3 is inserted into the through hole 2 in the insertion direction indicated by the arrow, and the bottom surface of the printed board 1 is the terminal 3 −.
Insert it all the way in so that it is close to the sides.

Then, when the portion of the terminal 3 that has been pushed out is released, the portion tries to return in the direction of closing the U-shape by reaction as shown in FIG. 2 (b). This reaction force is also the action of the leaf spring. That is, in this state, the terminals 3 are fitted with the printed board 1 sandwiched therebetween, so that even before being fixed by the solder 4, the terminals 3 do not fall off and a temporary fixing effect is obtained.

In this way, the plurality of terminals 3 are connected to the printed board 1
If the work procedure of soldering after being first fitted in and temporarily fixed is carried out, it is possible to mount the terminal securely without a gap or floating in a short time work.

Further, in order to improve the efficiency of the work of mounting the above-mentioned terminal 3 on the printed board 1, it is effective to provide the outer edge of the printed board 1 with an inclination angle in the thickness direction as shown in FIG. is there. FIG. 3 is an assembly diagram showing an application example of a terminal and a printed board to which the terminal structure of an electronic component according to the present invention is applied. The functional blocks similar to those shown in FIG. 2 described above are designated by the same reference numerals, and the description thereof will be omitted. That is, the point of improvement in this example is that the printed board 1 is provided with an inclined surface.

Then, as shown in FIG. 3A, the terminal 3 is aligned with the through hole 2 of the printed board 1, and the terminal 3 is attached to the printed board 1 as shown in FIG. 3B. Push it into the through hole 2 of. At this time, the portion (curved portion) of the terminal 3 contacts the inclined surface of the printed board 1, the terminal 3 is pushed in, and the portion slides on the inclined surface,
Naturally, the terminal 3 will be expanded. In this way, the terminal 3 pushed to a predetermined position is fitted as shown in FIG. 3C, and like the one shown in FIG. 2 described above, even before being fixed by the solder 4, it is temporarily fixed without falling off. It has the effect of. In this way, when the terminal 3 is mounted on the printed board 1, there is no need to push the terminal 3 apart and the working efficiency is improved.

In the embodiment of the present invention described above, an example is shown in which one end of the terminal 3 is curved in a hook shape, but the present invention is not limited to this example, For example, instead of the fishhook-like curve, as shown in FIG.
Similar effects can be obtained even with a terminal structure processed into a shape as shown in (b) and (c). That is, FIG. 4 (a)
4B shows a terminal 3a when bent so that a convex portion protrudes inward, and FIG. 4B shows a terminal 3b when bent so that one end portion is rolled inward. )
Is the terminal 3c when the entire one side is greatly curved.
Is. Even with these terminal configurations, it is possible to mount and process the terminal 3 in a state where the terminal 3 is securely and closely fitted to the printed board 1.

As described above, in the terminal structure of the electronic component according to the present invention, when the electronic component is mounted on the printed wiring board, the mounting height of the electronic component is increased due to the gap and the float which have been problems in the past. It is possible to prevent breach.

[0016]

As described above, in the terminal structure for an electronic component according to the present invention, a strip-shaped metal piece is bent into a substantially U-shape, one end of which has a straight shape that can be inserted into a printed board, and the other end of which is inward. The terminal structure of the electronic component can be realized in which the terminal is surely flat because the terminal is surely closely fitted to the printed board by functioning to be bent so as to sandwich the printed board.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of an embodiment of a terminal structure of an electronic component according to the present invention. (A) is a sectional view, (b) is a plan view,
(C) shows a bottom view.

FIG. 2 is an assembly diagram showing how a terminal to which the terminal structure of an electronic component according to the present invention is applied is mounted on a printed board.

FIG. 3 is an assembly diagram showing an application example of a terminal and a printed board to which the terminal structure of an electronic component according to the present invention is applied.

FIG. 4 is a diagram showing another three application examples (a), (b), (c) of the terminal structure of the electronic component according to the present invention.

FIG. 5 is a sectional view showing an example of a terminal structure of a conventional electronic component.

FIG. 6 is a diagram for explaining a problem of the terminal structure of the electronic component in the related art. (A) shows a scene in which a gap is generated between the printed board and the terminal, and (b) shows a scene in which the bonding electrode surface of the terminal is inclined and floats.

[Explanation of symbols]

1 ... Printed board 2 ... Through hole 3 ... Terminal (3a to 3c ... Application example of terminal structure) 4 ... Solder 5 ... Terminal 6 ... Printed wiring board 7 ... Cream solder

Claims (2)

[Claims] 1. A terminal structure for an electronic component, characterized in that a strip-shaped metal piece is bent into a substantially U-shape, one end of which has a straight shape that can be inserted into a printed board, and the other end of which is curved inward. . 2. A printed board having an outer edge inclined at an angle in the thickness direction, and a strip-shaped metal piece bent into a substantially U shape, one end of which has a straight shape which can be inserted into the printed board, and the other end of which is A terminal structure for an electronic component, comprising: a terminal curved inside.