JPS64657Y2 - - Google Patents

Description

[Detailed explanation of the invention] This type of conventional power supply bus has a structure in which two strip-shaped conductors made of copper plates or the like are pasted together with a thin appropriate insulating material sandwiched between them, and the connecting terminals are left behind and covered with external insulation. It is possible to perform good power supply and distribution with low characteristic impedance to electronic circuit components such as ICs or LSIs that are mounted in large numbers at high density on circuit boards as of today. By adopting such power supply busbars, the number of power supply and distribution wiring patterns to be formed on circuit boards can be reduced, effectively promoting high-density packaging, and in particular, as a means of rationally configuring power supply and distribution lines on circuit boards. Extremely useful.

By the way, when a large number of active electronic circuit components such as ICs or LSIs with different shapes such as 14 or 40 pins are mounted on a circuit board,
In response to this, it is necessary to mount power supply buses of various lengths vertically and horizontally, so it is necessary to manufacture many types of power supply buses of various lengths, and the process is also required. It becomes complicated. In addition, as mentioned above, the structure of conventional power supply busbars is like two strip-shaped conductors pasted together in an insulated state, so it is necessary to bend or cut such a power supply busbar to an appropriate length. There are various inconveniences when mounting on a circuit board, and even when mounting on a circuit board by soldering, warpage may occur on the power supply bus due to the difference in cooling speed between the circuit board and the power supply bus. There are various problems with this.

Therefore, the present invention does not have a laminated structure in which at least two strip-shaped conductors are overlapped with an insulating sheet material interposed therebetween, as in the past, but the front and back sides of the insulating material are stacked so that their longitudinal edges are adjacent to each other. To provide a power supply bus bar for a circuit board having a structure in which band-shaped conductors are arranged separately so as not to overlap each other, and the outer insulation coating is appropriately treated so that each connection terminal of both band-shaped conductors protrudes to the same side. be. In such a power supply bus, strip-shaped conductors are arranged adjacent to each other in the thickness direction, so when looking at its cross-sectional structure, it has the shape of almost a single piece. It becomes possible to mount by cutting or bending, and also to minimize the occurrence of warpage during soldering.

The drawing conceptually shows one embodiment of the present invention, and in FIGS. 1 and 2, terminals 1A and 2 are respectively formed protrudingly on the same side in the longitudinal direction so as to have the required pitch and offset. A strip-shaped conductor made of a copper plate or the like having a large number of 2A is shown, and both conductors 1 and 2 are separated by a film-shaped insulating material 3 such as an interlayer insulating film as shown in the figure, so that their strip-shaped main bodies do not overlap. They are arranged one above the other with an interval of . Reference numerals 4 and 5 indicate exterior insulating films for insulating the surfaces of both conductors 1 and 2. In order to manufacture such a power supply bus 6, for example, as shown in FIG. After bonding, an interlayer film-like insulating material 3 having a width that sufficiently covers the base of the terminal 1A and substantially the same width as the film 4 is superimposed on the conductor 1 and temporarily bonded. , the main body part of the other conductor 2 is placed side by side in a downwardly shifted position so that it does not overlap with the main body part of the conductor 1, and is temporarily joined in the same manner as above, and the last remaining exterior insulating film 5 is superimposed on it. By temporarily joining them together to form a laminate as shown in Fig. 2, and then applying heat and pressure welding to form a laminate, a vertical power supply with terminals 1A and 2A protruding to the same side as shown in the figure can be obtained. A busbar 6 can be obtained. In addition, instead of such a manufacturing method, first, both conductors 1 and 2 are arranged vertically in parallel on the front and back sides of the interlayer film-like insulating material 3 as shown in the figure, and are temporarily joined to each other. It is also possible to perform an exterior insulation coating treatment using a deep method or a mold method while the components are arranged so as to be located on substantially the same plane.

In any case, the power supply bus for a circuit board according to the present invention has at least two strip-shaped conductors arranged separately on the front and back sides of a film-shaped insulating material so that each terminal protrudes to the same side so that they do not overlap with each other. The structure is such that each conductor is coated with external insulation, so that each conductor is not simply laminated with insulation material interposed in its longitudinal direction, but is placed side by side at a required interval with the positions shifted vertically. Since it has a structure that is insulated so that it is almost a single piece in the thickness direction, compared to the conventional laminated structure,
The overall thickness can be made as thin as possible. Since the main bodies of each conductor extend parallel to each other at the required intervals in the longitudinal direction and do not overlap, with such a structure, both conductors will be shot even if they are cut at any point other than the terminal. There is no fear of such problems, and since the structure is thin and one-piece,
In addition to being easy to bend and mount as shown in the figure, it also has the advantage that the degree of warping, etc. that occurs in the conventional method is minimized when soldering to a circuit board. Therefore, it is possible to manufacture a large number of long power supply buses of the same type and then cut them to an appropriate length or bend them arbitrarily during mounting, which can be done at low cost while effectively promoting product standardization. It has the advantage of being possible. In addition, since the conductors of this power supply bus are not stacked in the width direction like in the past, there is virtually no stray capacitance formed between the conductors, so it is not only used for the purpose of power supply and distribution, but also for the purpose of avoiding stray capacitance in the electric circuit. It has characteristics such as being suitable for applications such as signal transmission and reception, and therefore can be employed with a high degree of freedom in mounting for electric paths and signal paths of circuit boards.

[Brief explanation of the drawing]

FIG. 1 is a conceptual partial cutaway plan view of a power supply bus for a circuit board according to an embodiment of the present invention, and FIG.
FIG. 3 is a cross-sectional configuration diagram of main parts in the figure, and FIG. 3 is a perspective view showing an example of a mounting mode. 1, 2... Strip conductor, 1A, 2A... Terminal, 3
...Interlayer film-like insulation material, 4, 5... Film-like exterior insulation material.

Claims (1)

[Scope of utility model registration request] Each strip-shaped conductor has at least two strip-shaped conductors each having a large number of terminals protruding from the same side in the longitudinal direction, and these strip-shaped conductors are separately arranged on the front and back sides of a film-shaped insulating material so as not to overlap each other, and each of the above-mentioned terminals is A power supply bus for a circuit board, characterized in that the entire portion except for the exterior insulation is coated.