JP3568507B2 - Conductive material - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a conductive member which is surface-mounted on a printed wiring board and which conducts electrical connection between a ground pattern of the printed wiring board and a ground conductor by pressing a ground conductor into contact.
[0002]
[Prior art]
Some conventional conductive members are formed of a thin plate member having conductive properties on at least the surface . For example, as shown in FIG. 8 , there is a member formed by bending a metal member. FIG. 8A is a side view, and FIG. 8B is a plan view.
[0003]
The conductive member shown here has a rectangular joint 110, and one surface of the joint 110 is a joint surface 110a to be soldered to a circuit pattern of a printed wiring board. In addition, a rectangular side portion 120 is provided upright at an end in the width direction (direction indicated by the symbol X) of the joining portion 110. Then, the contact portion 130 is formed by being folded from the end of the joint portion 110 in the front-rear direction (direction indicated by the symbol Y), which is a direction perpendicular to the width direction, to the opposite side of the joint surface 110a.
[0004]
The contact portion 130 comes into contact with the ground conductor at a portion (a portion indicated by the symbol α) projecting upward from the side portion 120 in a state where the joint surface 110a of the joint portion 110 is soldered to the printed wiring board. As a result, it is elastically deformed around the folded portion (the portion indicated by the symbol β) in a direction approaching the joining portion 110, and is pressed against the ground conductor by its reaction force. As a result, the circuit pattern of the printed wiring board is grounded.
[0005]
However, since the conductive member is miniaturized, the contact portion 130 having a spring function is also very small. Therefore, when an inadvertent external force is applied, such as during elastic deformation due to contact with the ground conductor or when the contact portion is accidentally hooked, the contact portion 130 may be shifted in the width direction. Therefore, the side portion 120 is provided to restrict the displacement of the contact portion 130 in the width direction.
[0006]
[Problems to be solved by the invention]
However, depending on the material of the conductive member, the thickness of the conductive member, and the method of the secondary processing, the side end portion 130a of the contact portion 130 is restricted by the inner wall surface of the side portion 120 when a shift in the width direction occurs. . Therefore, since the contact portion is increased, the frictional force between the side end portion 130a and the side portion 120 is increased, and a situation may occur in which the contact portion 130 cannot return to the original position from the elastically deformed state. Can be considered.
[0007]
Therefore, if the design items such as the material, plate thickness, and processing method of the conductive member are not carefully examined, the spring function of the contact portion 130 is eventually lost, and a good grounding state cannot be secured.
The present invention has been made to solve the above-described problem, and even if the contact portion is shifted in the width direction, the shift is restricted to a predetermined range, and the original position is changed from the elastically deformed state. An object of the present invention is to provide a conductive member that does not return, so that the above-described design items can be selected widely, thereby enabling cost reduction.
[0008]
Means for Solving the Problems and Effects of the Invention
The conductive member of the present invention is formed of a thin plate member having conductive properties on at least the surface, and includes a joint portion, a side portion, and a contact portion.
The joining portion has a joining surface to be soldered to the joining object, and a side portion is provided upright at an end in the width direction of the joining portion. The joining target is, for example, a circuit pattern of a printed wiring board.
[0009]
The contact part is formed from a joint part or a side part. Then, by abutting against the ground conductor, it is elastically deformed and pressed against the ground conductor.
In particular, in the present invention, on the inner wall surface of the side portion ,
By forming a streak-like projection that comes into contact when the displacement in the width direction of the contact portion is equal to or larger than a predetermined range , the contact portion when regulating the displacement in the width direction is reduced .
[0010]
That is, in the present invention, even when the contact portion is shifted in the width direction due to an inadvertent external force, the inner wall surface of the side portion and the side end portion of the contact portion are provided by providing the streak-like projection. They did not make direct contact.
Thus , even if the contact portion is misaligned due to an inadvertent external force, the side end of the contact portion comes into contact with the streak-like projection, and the frictional force can be reduced. Therefore, the contact portion does not return to the original position from the elastically deformed state.
[0012]
The contact portion, as shown in claim 2, is formed from the junction or the side portion, an arm portion disposed between the side portions, are formed from the tip of the arm portion, the upper side portion It is conceivable to have a configuration that has a protruding portion that protrudes to contact the ground conductor.
At this time, as shown in claim 3, the arm portion is formed from the vicinity of one end of the conductive member, the distal end of the arm portion is considered to be located in the vicinity of the other end of the conductive member. In this way, the displacement can be regulated mainly at the arm portion.
[0013]
By the way, as shown in claim 4 , it is conceivable that the protruding portion has a convex cross section. With this configuration, even if the contact portion is hooked, there is a large possibility that the contact portion is elastically deformed toward the joint portion, and damage to the contact portion can be prevented.
In addition, as described in claim 5 , a regulating portion that regulates displacement of the contact portion in a direction away from the joining portion may be provided. For example, it is conceivable that a part of the side edge portion is bent inward to form a regulating portion. This configuration can also prevent the contact portion from being damaged.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view showing a conductive member 1 according to the embodiment. 2A is a side view of the conductive member 1 (as viewed from the direction indicated by the symbol B in FIG. 1), and FIG. 2B is a front view of the conductive member 1 (see FIG. 1). (As viewed from the direction indicated by the symbol C).
[0015]
The conductive member 1 is formed by bending a thin plate-shaped metal member, and includes a joint portion 10, a side portion 20, and a contact portion 30.
Specifically, substantially rectangular side portions 20 are provided on both sides in the width direction of the conductive member 1 (the direction indicated by the symbol X in FIG. 1), and the two side portions 20 are arranged in the front-rear direction (FIG. 1). (In the direction indicated by the symbol Y in the drawing).
[0016]
The joint 10 is formed by being bent substantially vertically inward from the lower ends of the two side portions 20. In other words, the side part 20 is erected from the end in the width direction of the joint part 10. At this time, the lower surface of the joint 10 is the joint surface 10a to be soldered to the circuit pattern of the printed wiring board.
[0017]
A tongue piece 21 is formed to be bent substantially inward from the edge of one side portion 20. A contact portion 30 is formed from a lower end 21a of the tongue piece 21.
The contact portion 30 includes an arm portion 31 bent obliquely upward from the lower end portion 21a of the tongue piece 21 and a protruding portion 32 formed by further folding the arm portion 31 to the opposite side of the joint portion 10. Have.
[0018]
Here, the folded portion from the arm portion 31 (indicated by the symbol β in FIG. 2A) is located near the end opposite to the tongue piece 21.
The protruding portion 32 folded back from the arm portion 31 has a substantially arc shape as shown in FIG. 2A, and protrudes above the side portion 20. As will be described later, the protrusion 32 comes into pressure contact with the ground conductor. The end 32b of the protruding portion 32 is located just inside the connecting portion 50 that connects the two side portions 20, so that the protruding portion 32 is not displaced away from the joint 10. In this sense, the connecting portion 50 corresponds to a “regulating portion”. Further, the protruding portion 32 is processed so that the cross section becomes convex. As shown in FIG. FIG. 3 is an explanatory diagram showing a cross section taken along line BB of FIG.
[0019]
In the present invention, in particular, the streak-like projections 40 which are long in the up-down direction are formed on the inner wall surfaces of the side portions 20 described above. The streak-shaped projection 40 is formed at the center of the side part 20 in the front-rear direction. The stripe-shaped projections 40 correspond to “guide portions”.
The conductive member 1 thus configured functions by being soldered to a printed wiring board as shown in FIG. FIG. 4 shows a cross section taken along line AA in FIG. 1, but also shows a printed wiring board and the like not shown in FIG.
[0020]
As shown in FIG. 4, the conductive member 1 is mounted on a printed wiring board by soldering the bonding surface 10a of the bonding portion 10 to a circuit pattern. This mounting procedure is conventionally well known to those skilled in the art. For example, the conductive member 1 is placed on a circuit pattern to which cream solder is supplied, temporarily fixed, and then soldered by reflow soldering. Things.
[0021]
Then, by fixing the printed wiring board on which the conductive member 1 is mounted to a predetermined position such as a case, the protruding portion 32 of the contact portion 30 is pressed against a ground conductor such as a case. The ground conductor comes into contact with the protruding portion 32 from above the conductive member 1 and pushes the protruding portion 32 down in a direction approaching the joint portion 10 as indicated by a dashed line in FIG. The contact portion 30 has an elasticity centered on a bent portion from the tongue piece 21 to the arm portion 31 (a portion indicated by the symbol α) and a folded portion from the arm portion 31 to the protruding portion 32 (a portion indicated by the symbol β). Deform. FIG. 4 shows the contact portion 30 that has elastically deformed by contacting the ground conductor by a two-dot chain line. Then, the protruding portion 32 of the contact portion 30 is pressed against the ground conductor by the reaction force due to the elastic deformation. This ensures that the circuit pattern of the printed wiring board is electrically connected (grounded) to the ground conductor.
[0022]
However, in general, the contact portion is reduced in size with the miniaturization of the conductive member itself, so that inadvertent external force during elastic deformation may cause displacement in the width direction. For this reason, conventionally, a lateral portion has been provided to restrict the displacement of the contact portion in the width direction to a certain range.
[0023]
However, when such a displacement in the width direction occurs, if the displacement is regulated by the inner wall surface of the side portion, the contact portion between the contact portion and the side portion increases, and the frictional force increases. In some cases, the contact portion may not return to the original position from the elastically deformed state.
[0024]
On the other hand, in the conductive member 1 of the present embodiment, the streak-shaped protrusion 40 which is long in the vertical direction is provided on the inner wall surface of the side portion 20. Normally, the side end 31a of the arm 31 is not in contact with the streak-like projection 40. However, when the contact portion 30 is shifted in the width direction due to careless external force, the side end 31a of the arm 31 is Comes into contact with the streak-like projection 40. Further, in a state of being sufficiently elastically deformed, the side end 32 a of the protruding portion 32 comes into contact with the streak-like projection 40. That is, even if the contact portion 30 is displaced by an inadvertent external force, the streak-shaped projection 40 is provided so as not to contact the inner wall surface of the side portion 20.
[0025]
For example, the arrangement relationship between the arm portion 31 and the streak-shaped protrusion 40 of the side portion 20 is as shown in FIG. Therefore, even if the arm portion 31 is displaced by an inadvertent external force, the arm portion 31 comes into contact with the streak-like projection 40 and does not come into contact with the side portion 20. Therefore, the contact portion becomes smaller, and the frictional force becomes smaller.
[0026]
As a result, the contact portion 30 does not return to the original position from the elastically deformed state.
Further, in the conductive member 1 of the present embodiment, the end 32b of the protruding portion 32 is disposed inside the connecting portion 50 connecting the two side portions 20. Thereby, the deformation of the protruding portion 32 in a direction away from the joint portion 10 can be restricted, and the breakage of the protruding portion 32 can be prevented.
[0027]
In addition, as shown in FIG. 3, the cross section of the protruding portion 32 has a convex shape. Therefore, for example, the force F acting laterally on the portion indicated by the symbol δ in FIG. 3 can be decomposed into a normal force F1 and a tangential force F2, and the normal force F2 in the normal direction toward the joint 10 side. The possibility that the contact portion 30 is elastically deformed by the force F1 is high, and even if the projecting portion 32 is erroneously hooked from the lateral direction, it is possible to effectively prevent the projecting portion 32 from being damaged.
[0028]
As described above, the present invention is not limited to such embodiments at all, and can be implemented in various forms without departing from the gist of the present invention.
(A) In the conductive member 1 of the above embodiment, the two side portions 20 are connected by the connecting portion 50 at the upper end, and the connecting portion 10 is formed by bending inward from the lower end of the side portion 20. (See FIG. 2B).
[0029]
On the other hand, like the conductive member 2 shown in FIG. 6, the two side portions 20 are connected by the joint 11 formed from the lower end of the side portion 20, and the upper end of the side portion 20 is formed. It is also conceivable to bend the part inward to form a regulating part 51 instead of the connecting part 50.
[0030]
(B) In the above embodiment, the arm portion 31 is formed by bending from the side portion 20. However, when the configuration as in (a) above is employed, the joining portions 12, 13 as shown in FIG. Therefore, it is also conceivable to configure the conductive members 3 and 4 in which the contact portions 33 and 36 are formed.
[0031]
The conductive member 3 shown in FIG. 7A is folded back from the end 12 b in the front-rear direction of the joint 12 to the opposite side of the joint 12 to form an arm 34, and is further folded back from the tip of the arm 34 to protrude. 35 was formed.
On the other hand, in the conductive member 4 shown in FIG. 7B, the contact portion 36 was formed by folding back from the end portion 13b in the front-rear direction of the joint portion 13. In this case, the joint portion 13 and the protruding portion 38 are connected by an arm portion 37 arranged near one end, and the entire arm portion 37 becomes the center of elastic deformation.
[0032]
(C) In the conductive member 4 of FIG. 7B shown in (b) above, a position at which the contact portion 36 can contact the arm portion 37 when the contact portion 36 is elastically deformed (for example, a position indicated by a two-dot chain line as the symbol j). ) May be provided with streak-like projections. Further, a streak-shaped projection may be provided at a position where it can come into contact with any one end 38b of the protruding portion 38 (for example, a position indicated by a two-dot chain line as the symbol k or l). Alternatively, streak-like projections may be provided at a plurality of positions among the positions indicated by the symbols j, k, and l.
[0033]
As described above, the streak-shaped protrusion may be formed in consideration of the movable range in the elastic deformation of the contact portion, and the position is not limited. In the above embodiment, the length is long in the vertical direction, but this direction is not limited. Furthermore, the streak shape is not limited to a straight shape, and may be a curved shape.
[Brief description of the drawings]
FIG. 1 is a plan view showing a conductive member of an embodiment.
FIG. 2A is a side view illustrating a conductive member according to an embodiment, and FIG. 2B is a front view illustrating the conductive member according to the embodiment.
FIG. 3 is an explanatory diagram showing a cross section taken along line BB of FIG.
FIG. 4 is an explanatory diagram showing a cross section taken along line AA of FIG. 1 and showing a function of a conductive member.
FIG. 5 is an explanatory diagram showing a relationship between a side portion and an arm portion.
FIG. 6 is a front view showing a conductive member of another embodiment.
FIG. 7 is a side view showing a conductive member of another embodiment.
FIG. 8A is a side view showing a conventional conductive member, and FIG. 8B is a plan view showing a conventional conductive member.
[Explanation of symbols]
1, 2, 3, 4 ... conductive members 10, 11 ... joining portion 10a ... joining surface 20 ... side portion 21 ... tongue piece 21a ... lower end portions 30, 33, 36 ... contact portions 31, 34, 37 ... arm portions 31a ... side edge 32,35,38 ... protrusion 32a ... side end portion 32 b, 38b ... end 40 ... streaky projections 50 ... connecting portion 51 ... restricting portion

Claims (5)

At least on the surface is formed of a thin plate-like member having conductive properties,
A joint having a joint surface to be soldered to a joint object,
A lateral portion erected at the widthwise end of the joint,
A conductive member comprising a contact portion formed from the joint portion or the side portion and elastically deformed by being in contact with a ground conductor to press against the ground conductor.
Inside wall surface of the side sections, the width direction of displacement of the contact portion by forming a stripe-like projections in contact with greater than or equal to a predetermined range, and reduce the contact portion at the time of regulating the displacement in the width direction A conductive member characterized by the above-mentioned. The conductive member according to claim 1,
The contact portion,
An arm portion formed from the joint portion or the side portion and disposed between the side portions;
A conductive member formed from a tip of the arm portion, and having a protruding portion protruding above the side portion and in contact with the ground conductor . The conductive member according to claim 2 ,
The arm is formed near one end of the conductive member, and a tip of the arm on which the protrusion is formed is disposed near the other end of the conductive member. A conductive member characterized by the above-mentioned. The conductive member according to claim 2 or 3 ,
The conductive member , wherein the protrusion has a convex cross-sectional shape . The conductive member according to any one of claims 1 to 4 ,
A conductive member , comprising: a regulating portion that regulates displacement of the contact portion in a direction away from the joining portion .

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