JP2012094530A - Elastic contact - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elastic contact capable of preventing an edge of a suction nozzle from being detached from a suction face.SOLUTION: An elastic contact 1 comprises a base part 12, a contact part 2 and a supporting spring part 6, and a protrusion 8 is provided at a communication end 7 of the contact part 2. A suction nozzle 19 is displaced from a suction face 3. When the edge of the suction nozzle 19 rides on the protrusion 8, a pressing force of the suction nozzle 19 is applied to the supporting spring part 6, so as to elastically deform the supporting spring part 6 and change a relative position of the contact part 2 (protrusion 8) and the suction nozzle 19. The protrusion 8 is inclined, and therefore, a reaction force for relatively moving the edge of the suction nozzle 19 into the protrusion 8 reacts. Thus, the elastic contact 1 moves in an emboss 16, and the edge of the suction nozzle 19 is displaced from the protrusion 8. Displacement between the suction nozzle 19 and the suction face 3 can be dissolved, so as to prevent the edge of the suction nozzle 19 from being detached from the suction face 3.

Description

  The present invention belongs to the technical field of elastic contacts.

It consists of a thin plate member with conductivity and elasticity,
A base portion that is at least partially surface-mounted on the ground pattern of the printed wiring board; and
A contact portion which is arranged in a posture facing the base portion and serves as a contact point with a ground conductor different from the printed wiring board, and at least a part of the upper surface is a suction surface for a suction nozzle of an automatic mounting machine When,
There is an elastic contact having one end connected to an end of the contact portion and a support spring portion that supports the contact portion so as to be elastically deformable in a direction in which the contact portion approaches and moves away from the base portion.

JP 2000-150035 A

  When mounting an elastic contact on a printed wiring board by an automatic mounting machine, the elastic contact is accommodated in an embossed tape and supplied to the automatic mounting machine, and the suction surface of the elastic contact is sucked by the suction nozzle of the automatic mounting machine. A process of taking out from the emboss and placing it on the ground pattern of the printed wiring board and reflow soldering the elastic contact to the printed wiring board is common.

  In order to enable the above suction, at least a part of the upper surface of the contact portion is a suction surface for the suction nozzle of the automatic mounting machine, for example, because the position of the elastic contact in the emboss is not constant In addition, there may be a positional shift between the suction nozzle and the suction surface. An object of this invention is to cope with the position shift of a suction nozzle and a suction surface.

The elastic contact according to claim 1 is:
It consists of a thin plate member with conductivity and elasticity,
A base portion that is at least partially surface-mounted on the ground pattern of the printed wiring board; and
A contact portion which is arranged in a posture facing the base portion and serves as a contact point with a ground conductor different from the printed wiring board, and at least a part of the upper surface is a suction surface for a suction nozzle of an automatic mounting machine When,
In an elastic contact comprising one end connected to the end of the contact portion, and a support spring portion that supports the contact portion so as to be elastically deformable in a direction in which the contact portion approaches and moves away from the base portion.
A protrusion that protrudes toward the ground conductor is provided at an end portion of the contact portion where the support spring portion is connected.

In the elastic contact according to claim 1, since the protrusion that protrudes toward the ground conductor is provided at the end portion where the support spring portion of the contact portion is continuously provided, the position is shifted between the suction nozzle and the suction surface of the automatic mounting machine. When there is an edge of the suction nozzle on the protrusion, the edge of the suction nozzle presses the protrusion. This pressing force acts as a force in a direction away from the edge of the suction nozzle, and elastically deforms the support spring portion to change the relative position of the contact portion, that is, the protrusion and the suction nozzle. Along with this, the edge of the suction nozzle is displaced from the protrusion, so that the positional deviation between the suction nozzle and the suction surface is eliminated. Therefore, it is possible to prevent the edge of the suction nozzle from being detached from the suction surface.

  The elastic contact according to claim 2 is characterized in that, in the elastic contact according to claim 1, the protrusion is provided at one side on both sides of the contact portion. Thus, the contact portion is displaced so that the edge portion of the suction nozzle is relatively moved between the pair of protrusions, that is, the central portion, so that the effect of claim 1 is improved.

  According to a third aspect of the present invention, in the elastic contact according to the second aspect, the height of the protrusion is maximum at the edge portion connected to the side of the contact portion, and becomes smaller as the pair of opposing protrusions approaches. Therefore, the effect of claim 2 is improved.

  According to a fourth aspect of the present invention, in the elastic contact according to the first, second, or third aspect, in the state where an external force that elastically deforms the support spring portion is not exerted on the elastic contact, the suction surface and the base portion Therefore, not only the suction by the suction nozzle but also the subsequent surface mounting on the ground pattern of the printed wiring board is stabilized.

Plan view (a), left side view (b), front view (c), right side view (d1, d2), bottom view (e), AA sectional view (f), elastic contact of Example 1 BB sectional view (g), CC sectional view (h), left front perspective view (i), right front perspective view (j). Explanatory drawing of the package of an elastic contact of an Example, and nozzle adsorption | suction. Explanatory drawing of other Examples.

Next, embodiments of the present invention will be described based on examples of the present invention. The present invention is not limited to the following examples and the like, and it goes without saying that the present invention can be implemented in various ways without departing from the gist of the present invention.
[Example 1]
With reference to FIG. 1, the structure of the elastic contact 1 of a present Example is demonstrated. The elastic contact 1 is formed of a thin plate member having conductivity and elasticity (for example, a thin plate made of phosphor bronze, beryllium copper, stainless steel or the like plated with gold or tin).

As shown in FIG. 1, the elastic contact 1 includes a contact portion 2 at the top. The contact portion 2 is substantially rectangular, and a flat suction surface 3 is provided on the upper surface thereof.
A turn-up preventing piece 4 is connected to one end of the contact portion 2. The lower end 4 a of the turn-up preventing piece 4 is bent and is in contact with the lower surface of the intermediate plate 5. Since the lower end portion 4a is in a locked state on the lower surface of the intermediate plate 5, when a force in the direction of moving the contact portion 2 away from the intermediate plate 5 is applied, the turn-up preventing piece 4 is retained by the intermediate plate 5 and this force And prevents displacement and deformation of the contact portion 2 due to the above-described force. On the other hand, when a force in a direction to bring the contact portion 2 close to the intermediate plate 5 is applied, the turn-up preventing piece 4 (also the intermediate plate 5) does not hinder the displacement of the contact portion 2.

A support spring portion 6 is connected to the other end portion of the contact portion 2. The continuous end portion 7 of the contact portion 2 and the support spring portion 6 is bent at an inner angle of about 135 degrees.
The continuous end 7 is provided with a pair of protrusions 8 that protrude outward from the continuous end 7. One protrusion 8 is provided on each side of the contact portion 2 while being separated from each other.
The height of the protrusion 8 (the amount of protrusion from the surface of the continuous end 7) is the largest at the edge portion connected to the side of the contact portion 2, and decreases as the counterpart protrusion 8 forming a pair approaches.

  The support spring portion 6 has a curved surface shape that is slightly concave on the outside, and a lower end portion 6a thereof is bent in a U shape and connected to the intermediate plate 5. That is, the intermediate plate 5 supports the support spring portion 6, and the support spring portion 6 supports the contact portion 2. Then, the support spring portion 6 is elastically deformed with the lower end portion 6a as a fulcrum, so that the contact portion 2 can be displaced (downward displacement) to approach the intermediate plate 5 and can be returned (upward) by the amount of downward displacement. Displacement) is also possible.

  In addition, in the state where the force for moving the contact portion 2 to the intermediate plate 5 is not applied, the contact portion 2 (suction surface 3) and the intermediate plate 5 are designed to be parallel (the position of the contact portion 2 in this state). Is called the “origin position”). In addition, due to the function of the anti-spinning piece 4 described above, a displacement that turns up from the origin position is prevented in many cases depending on the magnitude of the external force applied at that time.

  Legs 9 are connected to both sides of the intermediate plate 5, respectively. The leg portion 9 includes a bent portion 10 that is continuous with the intermediate plate 5, a support wall portion 11 that is suspended from the bent portion 10, and a base portion 12 that is connected to the lower end of the support wall portion 11.

  1 (b), (d1), etc., the pair of leg portions 9 have their support wall portions 11 facing each other, their base portions 12 projecting toward each other, and are mirror images of each other. It is arranged with. The support wall portions 11 are parallel to each other, the angle between the support wall portion 11 and the base portion 12 is vertical, and the base portion 12 is designed to be parallel to the intermediate plate 5. The base 12 is not rectangular, but is provided with a notch 12a and a semicircular recess 12a.

Next, with reference to FIG. 2, the packing of the elastic contact 1 and the suction by the nozzle of the automatic mounting machine will be described.
As shown in FIG. 2, the elastic contact 1 is shipped in a packaged state accommodated in an emboss 16 provided on the embossed tape 15. Although only one emboss 16 is shown in FIG. 2, a number of embosses 16 are actually provided in a row on the emboss tape 15.

  The emboss 16 has a shape corresponding to the elastic contact 1, but is not a shape in which the elastic contact 1 is accommodated without looseness, and there is an appropriate clearance. That is, the position of the elastic contact 1 within the emboss 16 is indefinite within the clearance range.

  When the suction surface 3 is sucked by the suction nozzle 19 of the automatic mounting machine, if the suction nozzle 19 is normally placed on the suction surface 3 as shown in FIGS. There is no problem if it is in range.

On the other hand, as shown in FIG. 2C, the suction nozzle 19 and the suction surface 3 may be misaligned, and the edge of the suction nozzle 19 may get on the protrusion 8.
In this case, since the edge portion of the suction nozzle 19 presses the projection 8, the pressing force extends from the projection 8 to the support spring portion 6, and the support spring portion 6 is elastically deformed to contact the contact portion 2, that is, the projection 8 and the suction nozzle 19. The relative position of is changed. Further, since the height of the protrusion 8 is the largest at the edge portion connected to the side of the contact portion 2 and becomes smaller as it approaches the mating protrusion 8, the edge of the suction nozzle 19 riding on the protrusion 8. A reaction force that relatively moves between the pair of protrusions 8, that is, to the central portion acts. As a result, the elastic contact 1 moves within the emboss 16 in the direction in which the edge of the suction nozzle 19 is detached from the protrusion 8 (to the right in the example shown in FIG. 2D). The edge part falls off the protrusion 8. As a result, the suction nozzle 19
Since the positional deviation between the suction surface 3 and the suction surface 3 is eliminated, the edge of the suction nozzle 19 can be prevented from being detached from the suction surface 3.

  The automatic mounting machine sucks the suction surface 3 by the suction nozzle 19 to take out the elastic contact 1 from the emboss 16 and places it on a ground pattern of a printed wiring board (not shown). At this time, the suction nozzle 19 that sucks the elastic contact 1 first moves in an arc shape onto the printed wiring board, and rotates, for example, 90 degrees in order to align the direction of the elastic contact 1 on the printed wiring board. Since inertia acts on the elastic contact 1 when the arcuate movement of the suction nozzle 19 stops or stops rotating, the elastic contact 1 may rotate due to the inertia (the axis of rotation is the suction surface 3). Almost perpendicular to).

  However, in the elastic contact 1 of the present embodiment, since the protrusion 8 is present near the suction nozzle 19 that sucks the suction surface 3, when the elastic contact 1 is likely to rotate due to inertia as described above, the protrusion 8 moves to the suction nozzle. Since it abuts on 19, this rotation can be prevented. In particular, when the suction nozzle 19 has a rectangular cross-sectional shape as shown in FIG.

  The elastic contact 1 is not only attracted by the suction nozzle 19 but also attracted by the suction surface 3 when the external force for elastically deforming the support spring portion 6 is not exerted on the elastic contact 1. The subsequent surface mounting of the printed wiring board on the ground pattern is stabilized.

The printed wiring board on which the elastic contact 1 is placed as described above is sent to a reflow soldering process, and the elastic contact 1 is soldered to the printed wiring board.
The printed wiring board is assembled to the casing of the electronic device, but the contact portion 2 is brought into pressure contact with a ground conductor different from the surface-mounted printed wiring board, for example, the casing (which is conductive). As a result, the ground pattern of the printed wiring board and the housing are conducted through the elastic contact 1. At this time, the protrusion 8 provided on the continuous end 7 of the contact portion 2 (especially its edge portion) scrapes the surface of the housing and scrapes the oxide film or the like, so that the contact portion 2 contacts the housing. Good continuity.
[Other Examples]
The base portion 12 is not limited to the configuration of the first embodiment and is made of a thin plate member having conductivity and elasticity, and at least a part of the base portion 12 is surface-mounted on the ground pattern of the printed wiring board, and is arranged in a posture facing the base portion 12. The contact portion 2 is a contact with a grounding conductor different from the printed wiring board, and at least a part of the upper surface is a suction surface 3 for a suction nozzle of an automatic mounting machine, and one end is the contact portion. 2 and a support spring portion 6 that supports the contact portion 12 so as to be elastically deformable in a direction in which the contact portion 2 approaches and moves away from the base portion 12, and is provided on the ground conductor side. The elastic contact in which the protruding protrusion 8 is provided at the end of the contact portion 2 to which the support spring portion 6 is connected can achieve the object of the present invention as in the first embodiment. Some examples are shown in FIG.
(Example 2)
The support spring portion 6 may be connected to the base portion 12 like the elastic contact 1a of the second embodiment shown in FIGS. 3 (a) and 3 (b). Further, the base portion 12 may be a single plate instead of being divided into two as in the first embodiment. In the first embodiment, the turn-up preventing piece 4 is inclined toward the lower side of the contact portion 2, but may be reversely inclined as in the second embodiment. In that case, the end portion of the turn-up preventing piece 4 may be pressed by a pressing piece 11 a extending from the upper end of the support wall portion 11.
(Example 3)
Like the elastic contact 1b of the third embodiment shown in FIGS. 3C and 3D, the base portion 12 can be formed in a rectangular ring shape. Further, if the corner portion of the base portion 12 is bent upward to form the solder receiving portion 12c, self-alignment due to the molten solder staying below the solder receiving portion 12c during reflow soldering can be expected.

Note that the turn-up preventing piece 4 is not essential, and a structure without the turn-up preventing piece 4 as in the third embodiment can be provided.
Example 4
As in the elastic contact 1c of the fourth embodiment shown in FIGS. 3E and 3F, a so-called Z-type in which the support spring portion 6 is located below the contact portion 2 may be used.
(Example 5)
As in the elastic contact 1d of the fifth embodiment shown in FIGS. 3G and 3H, the contact portion 2, the support spring portion 6, and the base portion 12 can be formed by bending a belt-shaped thin plate member.

1, 1a, 1b, 1c, 1d ... elastic contact,
2 ... contact part,
3 ... adsorption surface,
6 ... support spring part,
7 ... the continuous end,
8 ... protrusions,
12 ... Base part,
15 ... Embossed tape,
16 ... emboss,
19: Suction nozzle.

The elastic contact according to claim 1 is:
It consists of a thin plate member with conductivity and elasticity,
A base portion that is at least partially surface-mounted on the ground pattern of the printed wiring board; and
A contact portion which is arranged in a posture facing the base portion and serves as a contact point with a ground conductor different from the printed wiring board, and at least a part of the upper surface is a suction surface for a suction nozzle of an automatic mounting machine When,
In an elastic contact comprising one end connected to the end of the contact portion, and a support spring portion that supports the contact portion so as to be elastically deformable in a direction in which the contact portion approaches and moves away from the base portion.
Protrusions that come into contact with the ground conductor when the ground conductor comes into contact with the contact portion are provided at an end portion where the support spring portion of the contact portion is connected ,
A pair of legs connected to both ends of the first direction, and an intermediate plate connected to the support spring portion at the end of the second direction intersecting the first direction;
An anti-flipping piece that extends from an end portion different from the end portion of the contact portion and is locked to a predetermined portion of the elastic contact to suppress displacement of the contact portion in a direction away from the intermediate plate; Have
The leg portion has a support wall portion extending in the printed wiring board direction, and the base portion is connected to an end portion of the support wall portion on the printed wiring board side,
The suction surface and the base portion are parallel when an external force that elastically deforms the support spring portion is not exerted on the elastic contact .

In the elastic contact according to claim 1, since the protrusion that protrudes toward the ground conductor is provided at the end portion where the support spring portion of the contact portion is continuously provided, the position is shifted between the suction nozzle and the suction surface of the automatic mounting machine. When there is an edge of the suction nozzle on the protrusion, the edge of the suction nozzle presses the protrusion. This pressing force acts as a force in a direction away from the edge of the suction nozzle, and elastically deforms the support spring portion to change the relative position of the contact portion, that is, the protrusion and the suction nozzle. Along with this, the edge of the suction nozzle is displaced from the protrusion, so that the positional deviation between the suction nozzle and the suction surface is eliminated. Therefore, it is possible to prevent the edge of the suction nozzle from being detached from the suction surface.
In addition, when the external force for elastically deforming the support spring portion is not exerted on the elastic contact, the suction surface and the base portion are parallel to each other. Surface mounting on the ground pattern of the board is stable.

Further, the elastic contact of claim 1, wherein the protrusions may be be provided by one place on the side of both the contact portions, when the edge of the suction nozzle has got on the projection as described above Since the contact portion is displaced so that the edge portion of the suction nozzle is relatively moved between the pair of protrusions, that is, to the center portion, the effect of claim 1 is improved.

Further, the elastic contact as described above, the height of the protrusion, the edge portion continuous to the side of the contact portion is at a maximum may be that decreases as approaching the projection of the other party in a pair, in which case the above the effect is improved.

Claims (4)

It consists of a thin plate member with conductivity and elasticity,
A base portion that is at least partially surface-mounted on the ground pattern of the printed wiring board; and
A contact portion which is arranged in a posture facing the base portion and serves as a contact point with a ground conductor different from the printed wiring board, and at least a part of the upper surface is a suction surface for a suction nozzle of an automatic mounting machine When,
In an elastic contact comprising one end connected to the end of the contact portion, and a support spring portion that supports the contact portion so as to be elastically deformable in a direction in which the contact portion approaches and moves away from the base portion.
An elastic contact characterized in that a protrusion protruding toward the ground conductor is provided at an end of the contact portion where the support spring portion is connected. The elastic contact according to claim 1,
The elastic contact according to claim 1, wherein the protrusion is provided at one location on each side of the contact portion. The elastic contact according to claim 2,
The elastic contact is characterized in that the height of the protrusion is maximum at an edge portion connected to the side of the contact portion, and decreases as the protrusion of the mating counterpart is approached. The elastic contact according to claim 1, 2 or 3,
The elastic contact according to claim 1, wherein the suction surface and the base portion are parallel when an external force for elastically deforming the support spring portion is not exerted on the elastic contact.

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