JPH0347598B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for connecting a power supply bus plate or a grounding basic plate and connection terminals of a board on which components are mounted at high density in electronic and communication equipment. This relates to flexible posts to be connected.

For example, when supplying power to a high-density board, conductive posts are connected between the bus plate of the board plate and the connection terminals provided on the edge of the board.
There is a method in which the substrate is supported parallel to the base plate and power is supplied with little voltage drop. On the other hand, in recent years there has been a trend to reduce the number of circuit boards by configuring as many electronic circuits as possible on a single board, and as a result, the board itself has become larger and more dense, and the bus plate between the board and the basic plate has become larger. It is necessary to connect a large number of posts in order to supply various types of power between them.

[Prior art]

The above-mentioned posts are basically connected by screws, and an example of this connection is shown in FIG. The figure shows an exploded perspective view of the bus plate and the post connected to the board. Reference numeral 1 is the bus plate, 2 is the board, 3 is the connection terminal provided on the edge of the board 2, 4 and 5 are communication holes, and 6 is the connection terminal. It's a post. The post 6 consists of a conductive solid rod 7 cut to a predetermined length and two screws 8 and 9 that fasten it together. Then, connect the rod 7 to the communication hole 4 of the bus plate 1 and the connection terminal 3 of the board 2.
The post 6 is connected by inserting the screws 8 and 9 from the sides opposite to the rod 7 of the bus plate 1 and the substrate 2 and fastening them to both ends of the rod 7. It's becoming like that.

[Problems to be Solved by the Invention] Therefore, in the structure described above, the axial direction of the post 6 is determined by the length of the rod 7 and has no degree of freedom. Also, the connection position of the post 6 is also
However, if the board 2 is not very large and the number of posts 6 is small, no problem will arise.

By the way, as mentioned above, a single board 2 itself has become larger and more dense, and as a result, a large capacity power supply is required, but the thickness of each post and the area of the board connection terminal 3 should not be made too large. Therefore, the number of posts will have to be increased. On the other hand, there are variations in the dimensional accuracy of the thickness of each part of the large board 2, the thickness of the many connection terminals arranged on the edges on both sides, and the length of the large number of posts 6 themselves. It becomes difficult to properly install the rod 7 of the post 6 between the bus plate 1 and the base plate 2 at the connection position. The same thing can be said about the dimensional accuracy of the communication holes 4 and 5 between the bus plate 1 and the board 2, making it difficult to ensure the perpendicularity of all the post rods 7, resulting in poor contact and distortion of the board 2. This may cause other problems.

Furthermore, this type of substrate 2 generates a lot of heat, so even when it is cooled, the difference in ambient temperature between various parts tends to be relatively large. On the other hand, there are many types of power supplied by a large number of posts 6, and therefore the thermal expansion at each post 6 varies in various ways, which may cause problems such as deformation of the board 2 during use. obtain.

[Means for solving problems]

The present invention provides a flexible post that eliminates the above problems and is capable of absorbing variations in dimensional accuracy and various miscellaneous thermal expansions.
The means includes providing an electrically conductive bellows having a bellows shape and being able to expand and contract and shift its center on at least a part of an electrically conductive rod that connects two electrically conductive bodies to establish an electrical connection; This is achieved by a flexible post characterized by a conductive bellows filled with a conductive liquid.

[Effect]

In the above flexible post, the bellows-shaped conductive bellows can expand and contract arbitrarily in the axial direction in response to variations in the spacing between the connection terminals on the bus plate and the board, and in the radial direction to accommodate variations in the pitch of the communication holes between the two. By absorbing these variations by misaligning the rods, the rods can be connected accurately at all connection positions, and various miscellaneous thermal expansions during use can be absorbed by the conductive bellows to prevent them from affecting the board. This is what I did.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a main part of an embodiment of the present invention as a sectional view. In order to make the explanation of the configuration and operation easier to understand, the same parts are designated by the same reference numerals throughout the figures.

Figure 1 shows an embodiment in which one end of the post rod is screwed and the other end is connected by soldering or silver brazing. A screw hole 10 is provided at the center of the large diameter end. Further, a conductive bellows 12 is provided on the small diameter side of the rod 7 between a thin connecting piece 11 having the same shape and forming a part of the rod 7. This electrically conductive bellows 12 is made of a conductive member such as phosphor bronze, formed into a bellows shape, and can be expanded and contracted in the axial direction and can also be misaligned in the radial direction. A conductive liquid 13 is sealed in order to supplement its conductivity and strength.
Furthermore, a protrusion 14 is provided at the center of the connecting piece 11.

FIG. 2 is a sectional view showing a connected state of flexible posts according to an embodiment of the present invention. In the figure, the protrusion 14 of the connecting piece 11 is inserted into the predetermined communication hole 4 of a plurality of bus plates 1 stacked on a basic earthing plate 15 via an insulating plate 16, so that the connecting piece 11 is integrally attached to the bus plate 1. Weld to. In addition, the connection piece 14 is connected to the upper bus plate 1.
A grounding basic plate 15, an insulating plate 16, and a lower bus plate 1 so as to be directly connected to
A cutout portion 17 is provided in the layer. Rod body 7
Attach the end opposite to the conductive bellows 12 to the connection terminal 3 of the board 2, aligning the communication hole 5 and the screw hole 10, and insert the screw 8 from the side opposite the rod 7 of the board 2 to tighten the screw hole. 10, and thus the rod 7 of the flexible post 6 is connected between the bus plate 1 and the connection terminal 3 of the board 2. and,
When connecting the above, bus plate 1 and board connection terminal 3
If there is variation in the distance between the communication holes 4 and 5, the conductive bellows 12 will expand and contract accordingly, and if there is variation in the pitch between the communication holes 4 and 5, the conductive bellows 12 will be misaligned accordingly, causing both of them to Absorb variation. Furthermore, when the rod 7 thermally expands due to the amount of power supplied to the post itself and the ambient temperature during use in the connected state, the conductive bellows 1
2 shrinks to absorb the thermal expansion.

As described above, the elasticity and misalignment properties of the conductive bellows 12 of the flexible post 6 make it possible to absorb variations in the dimensional accuracy of the connecting portion between the bus plate 1 and the board connection terminal 3. There is no need to increase accuracy to an extreme. Further, since the thermal expansion of the flexible post 6 during use is also absorbed, there is no influence on the substrate 2 and the like. Furthermore, since the liquid 13 is sealed inside the conductive bellows 12, there are effects such as less reduction in voltage and strength.

Although one embodiment of the present invention has been described above, the connection piece 11 may be configured to have a screw hole and be screwed. Further, the dimensions of the rod 7, the conductive bellows 12, and the connecting piece 11 can be arbitrarily determined depending on the distance between the bus plate 1 and the substrate 2, etc. Further, the position where the conductive bellows 12 is provided on the rod 7 is not limited to the bus plate 1 side, but may be in the middle of the rod 7 or on the substrate 2 side, and the conductive bellows 12 may be provided on a plurality of rods 7. good. Furthermore, the post may be made entirely of bellows.

〔Effect of the invention〕

As explained above, according to the present invention, variations in the dimensional accuracy of the connecting portion between the bus plate and the board connection terminal are three-dimensionally absorbed by the conductive bellows provided in the middle of the rod, so that the dimensional accuracy of the connecting portion is There is no need to increase the
Suitable for connecting a large number of posts to boards that are becoming larger and more dense. In addition, since thermal expansion of the rod shape is also absorbed and does not affect the substrate, deformation of the substrate is prevented, which is effective in large-capacity power supply systems.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of a flexible post of the present invention, FIG. 2 is a sectional view showing a connected state, and FIG. 3 is an exploded perspective view showing a conventional post in a connected state. In the figure, 1 is a bus plate, 2 is a substrate, 3 is a connection terminal, 6 is a flexible post, 7 is a rod, 8 is a screw, and 12 is a conductive bellows.

Claims (1)

[Claims] 1. A conductive bellows having a bellows shape and capable of being expanded and contracted and misaligned is provided on at least a part of a conductive rod that connects two conductive bodies to establish an electrical connection, and furthermore, a conductive bellows that is elastic and misaligned is provided within the conductive bellows. A flexible post characterized by having a conductive liquid sealed inside.