JP2016091864A - Conductive member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve immunity of a conductive member to vibrations or the like.SOLUTION: Bottom faces of a first base part 2 and a pair of second base parts 7 and 7 are soldered to a printed wiring board. By applying a load from a sheet metal or the like to a contact part 12 that is connected to the first base part 2 via an inclination part 11, a metal thin plate forming a conductive member 1 is elastically deformed and a repulsive force is applied to the sheet metal or the like. In the conductive member 1, the first base part 2 and the inclination part 11 are conjugated at an obtuse angle, thereby satisfactorily improving the immunity of the conductive member 1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a conductive member.

  Conventionally, a base part whose one side is a bonding surface for soldering to a printed circuit board, a spring piece connected to the base part, and an end part on the opposite side of the base part of the spring piece, a shield case, etc. A conductive member provided with a contact portion having a contact surface with respect to is proposed (for example, see Patent Document 1).

Japanese Patent No. 4482533

  As described in Patent Document 1, many existing conductive members are provided with a contact portion via a portion (spring piece) connected at a right angle or an acute angle to a base portion on which one surface is used as a bonding surface for soldering. ing. Many of these conductive members have extremely good durability, but if an endurance test that gives strong vibration or load that is not possible during normal use is performed, It is often damaged at the part connected to the. For this reason, there is room for further improvement in durability against vibration and the like of this type of conductive member.

  The present invention is a conductive member configured by bending a thin metal plate, and is inclined in a direction away from a tangential plane with respect to the one surface, and a base portion having one surface as a bonding surface for soldering and a part of the base portion. And a contact that is connected to an edge of the inclined portion that is away from the tangent plane and folded back substantially parallel to the tangential plane. And the base is disposed so as to surround a leg of a perpendicular line that is lowered from the center of the contact portion to the tangential plane, and is applied to a load applied in the tangential plane direction from the center of the contact portion. The inclined portion and the contact portion are supported. In addition, the term “substantially parallel” as used in the present specification is not limited as long as the contact portion can come into surface contact with the planar member parallel to the tangential plane, and may be an angle slightly deviated from parallel. Contains.

  In this case, when a load is applied to the contact portion, the metal thin plate constituting the conductive member is elastically deformed to change the relative angle between the base portion and the inclined portion and the relative angle between the inclined portion and the contact portion, thereby A repulsive force is applied to the load from the part. At this time, in the present invention, since the base portion and the inclined portion are connected to each other at an obtuse angle, the durability of the conductive member can be improved as follows.

  The applicant of the present application applies a durability test to a general conductive member in which the base portion, the inclined portion, and the contact portion are connected in a substantially Z shape in a side view so as to apply a strong load and vibration that cannot be obtained during normal use. Went. As a result, even if the angle at which the base portion and the inclined portion are connected and the angle at which the inclined portion and the contact portion are connected are the same acute angle, the former connecting portion is often damaged. discovered. The cause of this is unknown, but the base is completely fixed in the plane direction by soldering to the printed wiring board, etc., but the contact part can move freely, so the former is the case when the durability test is performed under severe conditions. It is considered that breakage is likely to occur at the joints of

  In the present invention, since the base portion soldered to a printed wiring board or the like and the inclined portion are connected at an obtuse angle, the durability of the conductive member can be improved. The base portion is disposed so as to surround the leg of the perpendicular line that is lowered from the center of the contact portion to the tangential plane, and supports the inclined portion and the contact portion with respect to a load applied in the tangential plane direction from the center of the contact portion. . For this reason, even if the base and the inclined part are connected at an obtuse angle as described above, the load can be favorably supported. The center here does not necessarily coincide with the center of gravity, and may be slightly deviated as long as the purpose of supporting the load as described above can be achieved.

The base portion is connected to the first base portion via a first base portion to which the inclined portion is connected, and a erection portion that floats in the direction of the contact portion from the tangential plane, and one surface is arranged on the tangential plane. And a second base portion that is provided as a joining surface for soldering. Thus, the said base does not necessarily need to be comprised by one plate shape.

  And in that case, the said installation part is provided in the both sides on both sides of the said inclination part, and the said contact part moves to the direction away from the said tangent plane by engaging with the engaging part connected to the said contact part. You may be restricted from doing. In that case, the construction part is engaged with the engagement part, so that the contact part can be prevented from rolling up even when the operator's finger touches the contact part when mounting the conductive member. it can.

Further, the contact portion may contact a flat surface opposed to the tangential plane within a rectangular contact range of 1 mm ² or more. In that case, even if the said electrically-conductive member is alternately exposed to severe low temperature and high temperature, the penetration | invasion of the air to the said contact range between a contact part and the said plane is suppressed. For this reason, it is suppressed that a contact part corrodes in the said contact range. Therefore, in that case, if the plane is an electrode surface or the like, the reliability of conduction can be improved. The contact range is desirably a rectangle of 4 mm ² or more, more desirably an aspect ratio of 1: 1 to 1:20. In that case, it is possible to better suppress the air from entering the central portion of the contact range, and it is possible to further suppress the corrosion.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure showing the structure of the electroconductive member of embodiment, (A) is a front view, (B) is a right view, (C) is a left view, (D) is a top view, (E) is a bottom view, F) is a rear view, and (G) is an upper left perspective view. It is a figure showing an example of the mounting state of the conductive member, (A) is a perspective view, (B) is a side view. It is a schematic diagram showing the test apparatus which measures the relationship between a contact area and resistance value. It is a graph showing the relationship between the contact area after a thermal shock test, and resistance value.

  Next, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited to the following embodiment, In the range which does not deviate from the summary of this invention, it can implement with a various form. Moreover, in the following description, it demonstrates using each direction of the up-down and right-and-left before and after which was written together in the figure as needed. However, each of these directions is only a direction defined in order to briefly explain the relative positional relationship between the respective parts constituting the conductive member. In actual use of the conductive member, the direction in which the conductive member is directed is arbitrary. For example, the conductive member is used in a state where the vertical direction shown in the figure does not match the vertical direction due to gravity. It doesn't matter.

[Configuration of the embodiment]
FIG. 1A to FIG. 1G are diagrams showing the configuration of a conductive member 1 to which the present invention is applied. The conductive member 1 is formed by punching and bending a single metal thin plate made of a spring metal (for example, phosphor bronze, beryllium copper, SUS, etc.) into a predetermined shape. In addition, the “folding” in the present specification does not necessarily have to be a sharp bend in which a ridge is formed, but may be a bend in which a corner has a cylindrical surface shape (so-called R).

  As shown in FIGS. 1A to 1G, the conductive member 1 has a rectangular plate-like first base 2 whose lower surface 2A (see FIG. 2B) is a bonding surface for soldering. I have. One long side of the first base portion 2 (that is, the front end edge defined in FIGS. 1A to 1G) is connected to the front plate portion 4 bent vertically in a direction away from the lower surface 2A. Has been. Band-shaped erection parts 5 and 5 are connected to the edge of the upper side of the front plate part 4 (that is, the side away from the first base part 2) from both left and right direction ends. The erection parts 5 and 5 are connected by being bent vertically from both the left and right ends of the upper end surface of the front plate part 4 so as to pass above the first base part 2. Moreover, the construction parts 5 and 5 are straightly extended backward in parallel with each other.

  Inclined connecting portions 6 and 6 are respectively connected to the rear ends of the erection portions 5 and 5 (that is, the end portion on the side away from the front plate portion 4), and the second base portion is connected to the other ends of the inclined connecting portions 6 and 6 respectively. 7 and 7 are connected to each other. The lower surfaces 7A and 7A (see FIG. 2B) of the second base portions 7 and 7 are disposed on the same plane as the lower surface 2A of the first base portion 2, and the lower surfaces 7A and 7A are also joined for soldering. It becomes a surface. The 2nd base parts 7 and 7 are all comprised by the rectangle long in the front-back direction. The right edge of the right second base 7 is arranged on the same straight line as the right edge of the first base 2, and the left edge of the left second base 7 is aligned with the left edge of the first base 2. They are arranged on the same straight line. The pair of inclined connecting portions 6 and 6 are inclined so as to go upward as they go forward so as to connect the front end edges of the second base portions 7 and 7 and the rear end edges of the erection portions 5 and 5, respectively. Are arranged.

  The rear end edges of the second base portions 7 and 7 are connected to one rear plate portion 8 that is bent perpendicularly in a direction away from the lower surfaces 7A and 7A. The upper end of the rear plate 8 protrudes from the left and right ends, and is folded at a right angle so as to pass over the second bases 7 and 7 at the same height as the erection parts 5 and 5. 9 and 9 are configured.

In addition, an inclined portion 11 that is inclined in a direction away from a tangential plane with respect to the lower surface 2A is connected to a position on the rear side edge of the first base portion 2 that does not overlap with the installation portions 5 and 5 in a plan view. The inclined portion 11 is configured by bending a rear side portion of the first base portion 2 of the metal thin plate at an obtuse angle (for example, 100 ° to 170 °). In addition, the inclined portion 11 extends upward from the erection portions 5 and 5, and has a first end substantially parallel to the lower surface 2 </ b> A of the first base portion 2 at the upper end (that is, the end edge away from the tangential plane). A contact portion 12 folded back to above the base portion 2 is connected. The contact portion 12 is formed in a substantially rectangular flat plate shape, and its front end edge is folded back obliquely backward to form a second folded portion 13. Further, the contact portion 12 has a plane portion (an example of a contact range) on the upper surface of at least 4 mm ^2, and the plane portion is configured in a rectangle having an aspect ratio of 17:14.

  Furthermore, the left and right end edges of the contact portion 12 are connected to hanging portions 15 and 15 that are rectangular in a side view and hang down through the inside of the erection portions 5 and 5, respectively. The lower ends of the hanging parts 15, 15 extend below the lower surfaces of the erection parts 5, 5, and the engaging parts 16, 16 that are bent outward in the left-right direction through the lower part of the erection parts 5, 5 Each is connected.

[Effect of the embodiment]
2A and 2B are diagrams illustrating an example of a mounted state of the conductive member 1. In the example of FIG. 2, the lower surfaces 2A, 7A, 7A of the first base 2 and the pair of second bases 7, 7 (both are examples of the base) are respectively soldered to the ground electrode (not shown) of the printed wiring board 51. It is attached. In this example, a sheet metal 52 such as a shield case is disposed in parallel with the mounting surface of the printed wiring board 51, and the contact portion 12 is pressed toward the printed wiring board 51 by the sheet metal 52.

  At this time, when a load is applied to the contact portion 12 from the sheet metal 52, the metal thin plate constituting the conductive member 1 is elastically deformed, and the relative angle between the first base portion 2 and the inclined portion 11 and the inclined portion 11 and the contact portion 12 The relative angle of changes. Due to this elastic deformation, a repulsive force (a force of about 2N in this embodiment) is applied from the contact portion 12 to the sheet metal 52. At this time, in the conductive member 1, the first base 2 and the inclined portion 11 are connected at an obtuse angle, so that the durability of the conductive member 1 can be improved as follows.

  The applicant of the present application applies a durability test to a general conductive member in which the base portion, the inclined portion, and the contact portion are connected in a substantially Z shape in a side view so as to apply a strong load and vibration that cannot be obtained during normal use. Went. As a result, even if the angle at which the base portion and the inclined portion are connected and the angle at which the inclined portion and the contact portion are connected are the same acute angle, the former connecting portion is often damaged. discovered. The cause of this is unknown, but the base is completely fixed in the plane direction by soldering to the printed wiring board, etc., but the contact part can move freely, so the former is the case when the durability test is performed under severe conditions. It is considered that breakage is likely to occur at the joints of

  In the conductive member 1, since the lower surface 2A is soldered to the printed wiring board 51 or the like and the inclined portion 11 is connected to the obtuse angle, the durability of the conductive member 1 can be improved. . Further, the first base 2 and the pair of second bases 7 and 7 are perpendicular feet (in this example, the first base 1) that are lowered from the center of the contact portion 12 to the tangential plane (for example, the mounting surface of the printed wiring board 51). It is arranged so as to surround a position slightly behind the center of the rear edge of the base portion 2, and supports the inclined portion 11 and the contact portion 12 against a load applied in the tangential plane direction from the center of the contact portion 12. For this reason, even if the 1st base 2 and the inclination part 11 are connected to the obtuse angle as mentioned above, a load can be favorably supported. Further, the conductive member 1 is configured to be able to apply up to about 4N as this load. That is, even if a force of 4N is applied to the contact portion 12 through the flat plate metal 52, the installation portion 5 does not contact the plate 52.

  The erection parts 5 and 5 are provided on both the left and right sides of the inclined part 11, and are engaged with engagement parts 16 and 16 connected to the contact part 12 via hanging parts 15 and 15, respectively. The movement of 12 in the direction away from the tangential plane is restricted. For this reason, even when an operator's finger | toe etc. touch the contact part 12 at the time of mounting of the said conductive member 1, it can suppress that the contact part 12 rises. Further, in the conductive member 1, by providing the first folded portions 9 and 9 and the second folded portion 13 as described above, the operator's finger or the like touches the edge of the thin metal plate constituting the conductive member 1. The finger can be prevented from being damaged.

Further, the contact portion 12 (contact area between namely sheet metal 52) planar portion of the top surface is at least 4 mm ^2. For this reason, even if the conductive member 1 is alternately exposed to severe low temperature and high temperature, the intrusion of air into the contact range between the contact portion 12 and the sheet metal 52 is suppressed, and the contact portion 12 in the contact range. Is prevented from corroding. Therefore, the reliability of conduction with the electrode surface such as the sheet metal 52 can be improved.

  Hereinafter, this point will be described in detail. The applicant of the present application performed the following thermal shock test on various commercially available conductive members 101. As shown in FIG. 3, the conductive member 101 is disposed in parallel with the base portion 102 soldered to the electrode P1, the inclined portion 111 connected to the base portion 102 to generate a repulsive force, and the soldering surface of the electrode P1. And a contact portion 112 that is in pressure contact with the electrode P2. The resistance value between the electrodes P1 and P2 was measured by a milliohm meter R. Twenty samples were prepared for 10 products (sample Nos. 1 to 10) in which the resistance value of the conductive member 101 in this state was 10 to 20 mΩ. In addition, the conductive member 101 having a shape with the inclined portion 111 different from the example in FIG. 3 is included in the product, and the conductive member 101 of the type in which the contact portion 112 is curved is also included in the product. .

  In the thermal shock test, a cycle of 1 hour in which the conductive member 101 and the electrodes P1 and P2 of this sample were exposed to −40 ° C. and 125 ° C. for 30 minutes each was executed 1000 times. Table 1 and FIG. 4 show the relationship between the resistance value (average value of 20 pieces) after the thermal shock test and the contact area between the contact portion 112 and the electrode P2.

As shown in Table 1 and FIG. 4, the resistance value after the thermal shock test is increased due to the influence of corrosion in any sample, but the influence increases as the contact area decreases. In particular, from the approximate curve shown in FIG. 4, it was found that when the contact area was less than 1 mm ² , corrosion rapidly progressed by the thermal shock test. Since the conductive member 1 of this embodiment has an area of the contact range of the contact portion 12 of at least 4 mm ² , it was found that corrosion can be suppressed satisfactorily. In addition, since the contact range of the contact portion 12 has an aspect ratio of 17:14, the distance between the boundary lines of the contact range facing each other is ensured, and air enters the center of the contact range. Is suppressed even better. Furthermore, in this embodiment, the contact portion 12 is pressed against the sheet metal 52 with a force of about 2N, so that air can be further suppressed from entering the central portion of the contact range.

  Thus, the conductive member 1 of this embodiment has good vibration resistance and good thermal corrosion resistance. For this reason, the electrically conductive member 1 of this embodiment can be used satisfactorily also for electronic equipment for automobiles and the like in which vibration is extremely intense and ambient temperature changes are also severe. Further, in the conductive member 1, since the current flows linearly along the inclined portion 11 configured in a flat plate shape, and the contact portion 12 is in surface contact with the sheet metal 52 and the like as described above, the impedance is reduced. Can be planned.

[Other Embodiments]
In addition, this invention is not limited to the said embodiment at all, It can implement with a various form in the range which does not deviate from the summary of this invention. For example, in the conductive member 1, the engaging parts 16, 16 are separated downward from the installation parts 5, 5 unless an external force is applied, but the present invention is not limited to this. For example, the engaging parts 16 and 16 are engaged with the construction parts 5 and 5 in advance in a state where the distance between the first base part 2 and the second base parts 7 and 7 and the contact part 12 is compressed to some extent by elastic deformation. Also good. In that case, a large repulsive force may be obtained only by pushing down the contact portion 12 slightly from the state. Furthermore, in that case, the dimensional accuracy of the height of the conductive member 1 may be improved. Further, the engaging portions 16, 16 may be omitted.

  Further, the shape of the base portion, the inclined portion, or the contact portion can be various shapes other than those described above. For example, the first base 2 may reach the positions of the second bases 7 and 7 by extending the right and left sides of the inclined part 11 rearward as they are. In that case, the front plate part 4, the erection part 5, and the inclined connection part 6 may be omitted, and the base part may be integrated. Further, the inclined portion 11 may have a portion curved in the thickness direction.

DESCRIPTION OF SYMBOLS 1 ... Conductive member 2 ... 1st base 5 ... Construction part 7 ... 2nd base 11 ... Inclination part 12 ... Contact part 15 ... Hanging part 16 ... Engagement part 51 ... Printed wiring board

Claims (4)

A conductive member formed by bending a thin metal plate,
A base where one side is a soldering joint surface;
Inclined in a direction away from a tangential plane with respect to the one surface to a part of the base, and an inclined portion having an obtuse angle with the one surface in the connected portion;
A contact portion connected to an edge of the inclined portion on the side away from the tangent plane, and folded back substantially parallel to the tangential plane;
With
The base portion is disposed so as to surround a leg of a perpendicular line that is lowered from the center of the contact portion to the tangential plane, and the inclined portion and the contact with respect to a load applied in the tangential plane direction from the center of the contact portion. A conductive member characterized by supporting the part. The base is
A first base to which the inclined portion is connected;
A second base portion connected to the first base portion via a erection portion that floats in the direction of the contact portion from the tangential plane, and having one surface disposed on the tangential plane and serving as a bonding surface for soldering;
The conductive member according to claim 1, further comprising:   The erection portion is provided on both sides of the inclined portion and engages with an engagement portion connected to the contact portion, thereby restricting the contact portion from moving in a direction away from the tangential plane. The conductive member according to claim 2. 4. The conductive member according to claim 1, wherein the contact portion is in contact with a plane disposed opposite to the tangential plane within a rectangular contact range of 1 mm ² or more.