JP2008181746A - Conductive connecting member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conductive connecting member capable of reducing production cost. <P>SOLUTION: When a leaf spring 17 is placed on a prescribed position of a metal chassis 12, the leaf spring 17 is going to fall over the elastic arm member 19 because of the imbalanced shape of the elastic arm member 19 obliquely projected from the flange portion 18 of the leaf spring 17.Here, a support member 20 is integrally formed on the flange portion 18 in the same direction as the running direction of the elastic arm member 19 to prevent the leaf spring 17 from falling. Accordingly, the leaf spring 17 can be steadily placed on the metal chassis 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a conductive connection member that electrically connects a member to be conducted and a metal member by elastically contacting the member to be conducted while being attached to the metal member.

In recent years, with the increase in speed of microcomputers or communication circuits used in ECUs (electronic control units) such as car navigation systems and displays, electromagnetic noise generated from ECUs has increased, and EMC (electromagnetic compatibility) measures are a performance. And the importance of ensuring reliability. As an effective means for EMC countermeasures, there is ground reinforcement by ground connection between a printed wiring board and a metal chassis, but the case of using a spring as an electrical connection method is increasing (see Patent Document 1).
JP-A-6-82705

  The applicant uses a plate spring having the shape shown in FIG. 10 as an electrical connection method between the printed wiring board and the metal chassis. The plate spring 2 is fixed to the metal chassis 1 by screwing or press caulking. For example, in the case of caulking by the burring portion 3 formed on the metal chassis 1, the plate spring is used at the time of press setup. 2 is positioned on the metal chassis 1 with the burring portion 3 positioned, but because of the unbalanced shape in which the elastic arm portion 5 is inclined and protrudes from the seat surface portion 4 of the plate spring 2, the plate shape Simply placing the spring 2 on the metal chassis 1 will cause the plate spring 2 to fall.

  The reason why the plate-like spring 2 becomes unbalanced as described above is that the space B between the metal chassis 1 and the printed wiring board 6 is narrowed due to the downsizing of the product as shown in FIG. This is because the distance A from the spring fulcrum to the load point in the elastic arm portion 5 needs to be secured. That is, if the length of the elastic arm portion 5 cannot be secured, the stress increases and the necessary spring performance cannot be obtained.

  Therefore, in order to prevent the plate spring 2 from collapsing, an air hole 7 is formed in the chassis as shown in FIG. 12, and suction is performed from below the plate spring 2 by air through a press die. Alternatively, as shown in FIG. 13, a hook portion 8 is formed on the metal chassis 1 and the plate spring 2 is hooked.

  However, in the method of sucking the plate spring 2 from the lower side by air, an apparatus for sucking air on the press mold is required. Moreover, in the method of forming the hook portion 8 on the metal chassis 1, additional processing of the hook portion 8 to the metal chassis 1 is required, and the manufacturing cost is generally increased.

  This invention is made | formed in view of the said situation, The objective is to provide the electroconductive connection member which can reduce manufacturing cost.

  According to the first aspect of the present invention, when the conductive connection member is placed on the metal member, the elastic arm portion extends from the seat surface portion in a direction inclined with respect to the surface direction of the seat surface portion. Although the conductive connecting member tends to tilt in the extending direction of the elastic arm portion, the support portion integrally formed with the seat surface portion regulates the tilt. Therefore, since the conductive connecting member can be stably placed on the metal member, a special means for placing the conductive connecting member on the metal member becomes unnecessary, and the manufacturing cost of the conductive connecting member is reduced. be able to.

According to the invention of claim 2, since the elastic arm portion is provided on both sides of one end of the seat surface portion, the conductive connecting member placed on the metal member can be moved in a direction orthogonal to the extending direction of the elastic arm portion. It can be stabilized.
According to the invention of claim 3, since the support portion is provided on both sides of one end of the seat surface portion, the conductive connection member placed on the metal member is also stable in the direction orthogonal to the extending direction of the elastic arm portion. Can be made.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
4 is a perspective view schematically showing a main unit constituting the main body of the car navigation apparatus, and FIG. 5 is a side view thereof. 4 and 5, the main unit 11 is a printed wiring board (conducted member) in which an ECU (electronic control unit) for controlling a car navigation device is mounted on a metal chassis (corresponding to a metal member) 12. Equivalent to 13). The metal chassis 12 is attached to the metal bracket of the vehicle in a state of being assembled as a car navigation device. In the attached state, the metal chassis 12 is electrically connected to the vehicle body and thus to the negative electrode of the battery. A plurality of bosses 14 are erected on the upper surface of the metal chassis 12, and a printed wiring board 13 is fixed to the bosses 14 with screws.
A caulking burring portion 15 and a positioning burring portion 16 projecting upward in the figure are formed at predetermined portions of the metal chassis 12 so as to be spaced apart from each other by a predetermined distance. Equivalent) 17 is fixed by caulking.

  FIG. 1 is a perspective view of the plate spring 17, FIG. 2 is a perspective view of the plate spring 17 shown attached to the metal chassis 12, and FIG. 3 is a side view thereof. 1 to 3, the plate spring 17 is for conducting the metal chassis 12 and the ground pattern of the printed wiring board 13, and has a pair of elastic arms on both sides of one end of the planar seating surface portion 18. The part 19 is formed integrally. The pair of elastic arm portions 19 extend in the same direction from the seating surface portion 18, and a bending portion 19 a that is folded back is formed at the front end portion, and a contact terminal 19 b is formed on the upper surface of the bending portion 19 a. Projectingly formed. The contact terminals 19b come into contact with a ground pattern (not shown) of the printed wiring board 13 in a state where the printed wiring board 13 is mounted on the metal chassis 12 (see FIG. 5).

  A mounting hole 18a and a positioning hole 18b are formed in the seat surface portion 18 with a predetermined distance therebetween. The caulking burring portion 15 formed in the metal chassis 12 is inserted into the mounting hole portion 18a. The positioning hole 18b is inserted with the positioning burring part 16 formed in the metal chassis 12, and the burring parts 15 and 16 are arranged in consideration of the dimensional accuracy of the burring parts 15 and 16 and the holes 18a and 18b. It is formed in a long shape with respect to the direction.

  Here, a support portion 20 is integrally formed with the seat surface portion 18 in connection with the present invention. The support portion 20 is provided to prevent the plate-like spring 17 placed on the metal chassis 12 from falling down, and the elastic arm portion 19 is extended in the surface direction of the seat surface portion 18. It is formed to extend in the same direction as the direction. In this case, the support portion 20 is set so that the tip end position thereof is located closer to the tip end side of the elastic arm portion 19 than the center of gravity position of the entire plate spring 17.

FIG. 6 shows a method of attaching the plate spring 17 having the above shape to the metal chassis 12. As shown in FIG. 6, the plate spring 17 is placed so that the mounting hole 18a of the plate spring 17 is inserted into the caulking burring portion 15 formed in the metal chassis 12 (FIG. 6A). , (B)). At this time, the upper end of the caulking burring portion 15 slightly protrudes upward from the mounting hole portion 18a of the plate spring 17. Further, the rotation of the plate spring 17 is prevented by inserting the positioning burring portion 16 into the positioning hole 18b.
In this state where the plate spring 17 is placed on the metal chassis 12, an unbalanced shape in which the pair of elastic arm portions 19 extends from the seat surface portion 18 in a direction inclined with respect to the surface direction of the seat surface portion 18. Therefore, the plate spring 17 tends to fall in the extending direction of the elastic arm portion 19.

  However, according to the present embodiment, the support portion 20 formed integrally with the seat surface portion 18 is formed in the same direction as the extending direction of the elastic arm portion 19 in the surface direction of the seat surface portion 18. Since the tip position is located closer to the tip of the elastic arm portion 19 than the center of gravity of the entire plate spring 17, the plate spring 17 is prevented from falling in the extending direction of the elastic arm portion 19. .

  In addition, since the elastic arm portion 19 is integrally formed on both sides of one end of the seat surface portion 18, the plate spring 17 is balanced in the direction orthogonal to the extending direction of the elastic arm portion 19. It is mounted on the metal chassis 12 in a stable state also in a direction orthogonal to the extending direction of 19. Accordingly, when the plate spring 17 is placed on the metal chassis 12, the plate spring 17 is placed in a stable state in any direction, for example, when an impact acts on the metal chassis 12. However, it is possible to maintain a stable state against a certain amount of impact.

Next, as shown in FIG. 6 (c), the plate spring 17 is inserted into the mounting hole 18a of the plate spring 17 and crushes the head of the caulking burring portion 15 projecting upward, thereby removing the plate spring 17 from the metal. It is caulked and fixed to the chassis 12.
Next, when the printed wiring board 13 is screwed to a boss attached to the metal chassis 12, a ground pattern (not shown) formed on the printed wiring board 13 is formed on the elastic arm portion 19 of the plate spring 17. The contact terminal 19b comes into elastic contact. Thereby, since the ground line of the printed wiring board 13 is electrically connected to the metal chassis 12 through the plate-like spring 17, the ground of the printed wiring board 13 can be strengthened.

Then, the car navigation device can be assembled by assembling components (not shown) to the main unit 11 configured as described above.
According to such an embodiment, in the plate spring 17 in which the elastic arm portion 19 is integrally formed with the seat surface portion 18, the support portion 20 that is in the same direction as the extending direction of the elastic arm portion 19 in the surface direction of the seat surface portion 18. Is formed integrally with the seating surface portion 18, so that the plate spring 17 can be placed on the metal chassis 12 in a stable state. Therefore, in order to prevent the plate-like spring placed on the metal chassis from falling down, a hole is formed in the metal chassis, and suction is performed from below the plate-like spring through the hole, or a hook is attached to the metal chassis. Unlike the conventional example in which the portion is formed and the plate-like spring is hooked, the manufacturing cost can be reduced.
In addition, since the support portion 20 having such an excellent effect can be formed at the same time when the plate spring 17 is press-molded, it can be carried out without increasing the component cost.

The present invention is not limited to the above embodiment, and can be modified or expanded as follows.
As shown in FIG. 7, a pair of support portions 20 are integrally formed on both sides of one end of the seat surface portion 18, and an elastic arm portion 19 is integrally formed on the seat surface portion 18 so as to be between the support portions 20. Also good.
As shown in FIG. 8, elastic arm portions 19 and support portions 20 may be integrally formed at one end of the seat surface portion 18 one by one in the same direction.
As shown in FIG. 9, conduction with another metal chassis (corresponding to a conductive member) 21 may be achieved by a plate spring 17.

The perspective view of the plate-shaped spring in one Example of this invention Perspective view of plate spring shown attached to metal chassis Side view of a plate spring shown attached to a metal chassis Perspective view of main unit Side view of main unit Perspective view of metal chassis showing installation procedure of plate spring FIG. 1 equivalent view showing a modification of the present invention FIG. 1 equivalent diagram showing a different modification FIG. 3 equivalent view showing a different modification FIG. 2 equivalent diagram showing a conventional example Figure equivalent to FIG. Top view of the metal chassis FIG. 2 equivalent diagram showing a different conventional example

Explanation of symbols

  In the drawings, 12 is a metal chassis (metal member), 13 is a printed wiring board (conductive member), 17 is a plate-like spring (conductive connection member), 18 is a seat surface portion, 19 is an elastic arm portion, 20 is a support portion, 21 is a metal chassis (conductive member).

Claims (3)

A seat surface portion attached to the metal member in a surface contact state; and an elastic arm portion integrally formed with the seat surface portion and extending in a direction inclined with respect to the surface direction of the seat surface portion. In the conductive connection member that electrically connects the metal member and the conductive member by elastically contacting the conductive member,
A support portion integrally formed with the seat surface portion and extending in the same direction as the extending direction of the elastic arm portion in the surface direction of the seat surface portion;
The conductive connection member according to claim 1, wherein the support portion has a distal end located closer to a distal end side of the elastic arm portion than a position of the center of gravity of the entire support portion. A pair of the elastic arm portions are provided on both sides of one end of the seat surface portion,
The conductive connection member according to claim 1, wherein the support portion is provided between the elastic arm portions. A pair of the support portions are provided on both sides of one end of the seat surface portion,
The conductive connection member according to claim 1, wherein the elastic arm portion is provided between the support portions.

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