JP4001215B2 - Connecting terminal - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connection terminal mounted on a printed circuit board.
[0002]
[Prior art]
When a plurality of printed circuit boards are incorporated in an electronic device or the like, for example, the lands 2 and 4 of the ground lines of the printed circuit boards 1 and 3 facing each other are connected by the ground spring terminal 5 as shown in FIG. . The ground spring terminal 5 is bent in a substantially U shape, one side is a fixed piece 5a, the other side is a contact piece 5b, the fixed piece 5a is soldered to the land 2 of the printed circuit board 1 on one side, and the contact piece 5b The contact portion 5c formed at the tip is pressed against the land 4 of the printed circuit board 3 opposed by a spring force to electrically connect the ground lines of the printed circuit boards 1 and 3.
[0003]
[Problems to be solved by the invention]
However, since the ground spring terminal having the above-described shape is open between the tip 5d of the contact portion 5c formed at the tip of the contact piece 5b and the fixed piece 5a, When assembled, the operator's gloves or the like are easily caught on the tip 5d of the contact portion 5c, and there is a problem that the contact piece 5c is pulled in the direction of arrow A to be deformed or broken from the bent portion. Therefore, the operator must take care not to get gloves or the like caught on the contact portion 5c of the ground spring terminal 5 at the time of assembly, and workability is reduced.
[0004]
Further, when the fixed piece 5 a is soldered to the land 2, misalignment is likely to occur, and a short circuit occurs due to contact with an adjacent land, or the contact portion 5 c is excellently connected to the land 4 of the counterpart printed circuit board 3. There are also problems such as the inability to contact.
Since the ground spring terminal 5 is surface-mounted on the printed circuit board 1 together with electronic components by an automatic machine, if the position is displaced during soldering, or is deformed or broken after mounting, the process relationship and product value It is difficult to replace only the ground spring terminal 5 from a viewpoint or the like, and the printed circuit board is often discarded. The ground spring terminal 5 is a low-priced component, and discarding the entire printed circuit board on which many expensive electronic components are mounted for such a low-priced ground spring terminal 5 not only wastes resources but also as a final product. This causes problems such as an increase in the cost of the printed circuit board.
[0005]
The present invention has been made in view of the above-described points, and provides a connection terminal that prevents misalignment during surface mounting on a printed circuit board and that makes it difficult for an operator's gloves to be caught during assembly after mounting. The purpose is to do.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, a conductive thin plate member having a spring property is bent into a substantially U shape, one side is a fixed piece, the other side is a contact piece, and the outside of the contact piece is outside the tip. A semicircular contact portion that bulges out and extends toward the vicinity of the tip of the fixed piece is formed, and a protrusion that protrudes to the outside of the contact portion and near the tip position is formed at the tip of the fixed piece. It is characterized by that.
[0007]
The contact portion is curved in a substantially semicircular shape and the tip extends near the tip of the fixed piece, so that the opening between the tip and the fixed piece is narrowed, and the protrusion of the fixed piece is outside the contact portion. By projecting upward to the vicinity of the tip position, it is possible to prevent a glove or the like from being caught during assembly after being mounted on the printed circuit board. As a result, it is possible to prevent problems such as the connection terminal being deformed or caused to break.
[0008]
In addition, when the contact portion is excessively pressed against the land of the other printed circuit board when the printed circuit board is assembled, the tip of the contact portion is brought into contact with and locked to the fixed piece, thereby preventing the contact portion from over-contacting. As a result, deterioration or deformation of the spring property is prevented, and durability is improved.
In the invention of claim 2, the fixed piece is formed such that two connection portions having the same size are formed apart from each other on the center line, and are connected to lands formed on the printed circuit board through these connection portions. It is a feature.
[0009]
The two connecting portions are of the same size and are spaced apart from each other on the center line of the fixed piece, so that the surface tension of the solder acting on the lands formed on the printed circuit board can be reduced. Be the same. As a result, the fixed piece is positioned and fixed to the land, and is prevented from coming into contact with another line formed adjacently. Further, it is possible to satisfactorily come into contact with the land of the counterpart printed circuit board in which the apexes of the contact portions are arranged to face each other.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the drawings.
As shown in FIGS. 1 to 4, the ground spring terminal 10 as a connection terminal has a substantially U shape, one side (lower side in the figure) is a fixed piece 10a, and the other side (upper side in the figure) is a contact piece 10b. Has been. The fixed piece 10a has a tip center portion 10c protruding and a tip portion 10d bent upward (hereinafter referred to as “projection 10d”). The central portion 10c is a connecting portion for soldering to a land of an earth line formed on a printed circuit board to be described later (hereinafter referred to as “connecting portion 10c”).
[0011]
A contact portion 10e is formed at the tip of the contact piece 10b. The contact portion 10e is formed in a substantially semicircular shape facing outward (upward in the figure), and a tip (lower end) 10f faces the vicinity of the tip of the inner surface of the fixed piece 10a, and the contact It extends to substantially the same position as the base portion of the portion 10e. As shown in FIGS. 2 and 4, the contact portion 10e has its both side portions gradually chamfered from the apex position to the tip end 10f to narrow the width, and further, both corners of the tip end 10f are chamfered to form a curved surface. . That is, the contact portion 10e has a smooth curved surface, with both end portions on the tip side half chamfered from the apex position as the contact point.
[0012]
The protrusion 10d of the fixed piece 10a has substantially the same height as the free height of the tip 10f of the contact portion 10e from the inner surface of the fixed piece 10a, and the upper part is chamfered on both sides to form a substantially semicircular shape. It is a curved surface.
As shown in FIG. 3, the fixed piece 10a is largely punched near the connecting portion with the contact piece 10b, leaving a tongue-like connecting portion 10g at the approximate center. The connecting portion 10g is arranged on the same straight line as the tip connecting portion 10c (on the center line of the fixed piece 10a) and has the same size (area). That is, the two connection portions 10c and 10g have the same area and are spaced apart on the center line of the fixed piece 10a. Similarly to the connection portion 10c, the connection portion 10g is soldered to a land of an earth line formed on the printed board.
[0013]
The ground spring terminal 10 is mounted on a printed circuit board with the contact piece 10b adsorbed by an automatic machine. Therefore, the contact piece 10b has a size (width) that can be adsorbed by an adsorber indicated by a two-dot chain line in FIG. The earth spring terminal 10 is formed of a conductive thin plate having a spring property.
As shown in FIG. 5, lands 12 and 13 corresponding to the connection portions 10c and 10g of the ground spring terminal 10 and the same size (area) as these connection portions 10c and 10g are formed on the printed circuit board 11. . These lands 12 and 13 are connected inside the printed circuit board 11 as shown in FIG. 6, and further connected to an earth line (not shown).
[0014]
As shown in FIG. 6, the ground spring terminal 10 is soldered by placing the connection portions 10 c and 10 g of the fixed piece 10 a on lands 12 and 13 formed on the printed circuit board 11. The two connection portions 10c and 10g have the same size (area) and are spaced apart from each other on the center line of the fixed piece 10a. The lands 12 and 13 have the same size as the connection portions 10c and 10g. When the lands 12 and 13 are soldered, the surface tension of the solder between the connecting portions 10c and 10g and the lands 12 and 13 is substantially the same as the connecting portions 10c and 10g. Act on. Thereby, the position shift of the connection parts 10c and 10g is prevented, and the fixed piece 10a is positioned and fixed accurately. That is, the ground spring terminal 10 is accurately positioned and fixed to the printed board 11. As a result, the ground spring terminal 10 is prevented from coming into contact with another line formed adjacent to the fixing portion 10a, and the ground line of the printed circuit board 15 in which the apex of the contact portion 10e is opposed. The land 16 can be accurately contacted.
[0015]
The ground spring terminal 10 has a smooth curved surface by chamfering the upper part of the protrusion 10d of the fixed piece 10a and both corners of the tip 10f of the contact part 10e, and the tip of the contact part 10e is curved in a substantially semicircular shape. Since 10f extends to the fixed piece 10a side (FIG. 4), it is possible to prevent a glove or the like from being caught when the printed circuit board 11 is mounted after mounting.
[0016]
Further, the contact portion 10e is curved in a substantially semicircular shape and the tip 10f extends toward the fixed piece 10a, so that the opening between the tip 10f and the fixed piece 10a becomes narrow, and the fixed piece Since the protrusion 10d of 10a protrudes upward to the height position of the tip 10f outward of the contact portion 10e (FIG. 1), it is possible to prevent a glove or the like from being caught by the tip 10f of the contact portion 10e. That is, the protrusion 10d acts as a protective cover for the tip 10f of the contact portion 10e. Accordingly, it is possible to prevent the earth spring terminal 10 from being deformed or being broken due to a glove or the like being caught when the printed circuit board 11 is assembled.
[0017]
Further, when the contact portion 10e is excessively pressed by the land 16 of the counterpart printed circuit board 15 when the printed circuit board 11 is assembled, the tip 10f is brought into contact with and locked to the fixed piece 10a. That is, the tip 10f acts as a stopper for the contact portion 10e. As a result, the earth spring terminal 10 is prevented from being over-contacted by the contact portion 10e, the spring property is prevented from being deteriorated or deformed, and the durability is improved.
[0018]
In the above-described embodiment, the case where the present invention is applied to the earth spring terminal has been described. However, the present invention is not limited to the earth spring terminal, and may be applied to other connection terminals.
[0019]
【The invention's effect】
As described above, according to the present invention, the contact portion is curved in a substantially semicircular shape and the tip extends near the tip of the fixed piece, so that the opening between the tip and the fixed piece is narrow. And the protrusion of the fixed piece protrudes upward to the vicinity of the tip position outward of the contact portion, and when assembled after mounting on the printed circuit board, the operator's gloves etc. are caught and deformed, Alternatively, it is prevented from being broken by being caused. As a result, workability is improved and waste due to disposal of the printed circuit board after mounting electronic components is eliminated, thereby improving yield and reducing cost.
[0020]
Further, when the printed circuit board is assembled, when the printed circuit board is excessively pressed against the land of the other printed circuit board, the tip is brought into contact with the fixed piece and is locked to prevent the contact section from being over-contacted. Thereby, deterioration or deformation of the spring property is prevented, and durability is improved.
In the invention of claim 2, the two connecting portions are of the same size and are spaced apart from each other on the center line of the fixed piece, so that they act on the lands formed on the printed circuit board when soldered. The surface tension of the solder becomes substantially the same, the fixed piece is accurately positioned and fixed to the land, and it is prevented from coming into contact with other adjacent lines, and the apex of the contact portion is opposed. It is possible to satisfactorily contact the land of the other printed circuit board to be arranged.
[Brief description of the drawings]
FIG. 1 is a front view of a ground spring terminal to which the present invention is applied.
2 is a plan view of the ground spring terminal of FIG. 1. FIG.
FIG. 3 is a bottom view of the ground spring terminal of FIG. 1;
4 is a side view of the ground spring terminal of FIG. 1. FIG. 5 is a plan view of a principal part of a printed circuit board on which the ground spring terminal of FIG. 1 is surface-mounted.
6 is a cross-sectional view in which the earth spring terminal of FIG. 1 is surface-mounted on the printed circuit board of FIG. 5;
FIG. 7 is a cross-sectional view of a printed circuit board on which a conventional ground spring terminal is surface-mounted.
[Explanation of symbols]
10 Earth spring terminal (connection terminal)
10a Fixed piece 10b Contact piece 10c, 10g Connection part 10d Protrusion 10e Contact part 11, 15 Printed circuit board 12, 13, 16 Land

Claims (2)

A conductive thin plate member having a spring property is bent into a substantially U shape, one side is a fixed piece, the other side is a contact piece, and bulges outward at the tip of the contact piece, the tip of which is the tip of the fixed piece A connection terminal, characterized in that a semicircular contact portion extending toward the vicinity is formed, and a protrusion protruding to the outside of the contact portion and in the vicinity of the tip position is formed at the tip of the fixed piece. 2. The fixing piece according to claim 1, wherein two connection portions having the same size are formed on the center line so as to be separated from each other, and are connected to lands formed on the printed circuit board through these connection portions. Connection terminal as described.

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