JPH0595075U - High current circuit board - Google Patents

Abstract

(57) [Summary] [Structure] Rod-shaped conductor 3 molded into a desired circuit pattern
A flat portion 4 is provided at both ends of the flat conductor 4 such that the lower surface thereof is at the same level as the lower surface of the rod-shaped conductor 3, and the flat portion 4 is provided with a cylindrical portion 5 projecting toward the lower surface to form the large-current circuit conductor 1. ,
The large current circuit conductor 1 was fixed to the insulating substrate 1 by inserting the cylindrical portion 5 into the hole 6 of the insulating substrate 2. [Effect] It is not necessary to use an expensive punching die for manufacturing the large-current circuit conductor, the manufacturing cost of the large-current circuit board can be significantly reduced, and the delivery time can be shortened. Since the lower surface of the flat portion is formed so as to be at the same level as the lower surface of the rod-shaped conductor, the flat portion has a good seat when set on the insulating substrate, and the assembling work is easy.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a large current circuit board having a circuit conductor through which a large current for electric power flows.

[0002]

[Prior Art]

 This type of conventional large-current circuit board is formed by punching a copper plate, which is considerably thicker than the copper foil for signal and current circuits, into a desired circuit pattern by press punching using a die, and A cylindrical portion protruding toward the lower surface side is formed by burring or the like (if necessary in the intermediate portion) to produce a large-current circuit conductor. It is manufactured by inserting it and fixing it to an insulating substrate (JP-A-63-237495). The high-current circuit conductor is fixed to the insulating substrate by adhesion or soldering.

[0003]

[Problems to be solved by the device]

 Since the conventional large-current circuit board is manufactured by punching from a copper plate to manufacture a large-current circuit conductor, a punching die is required to manufacture the large-current circuit conductor, and this die is extremely expensive. Therefore, there is a problem that not only the manufacturing cost becomes high, but also it takes a long time to manufacture the mold, so that it is not possible to deal with a product with a short delivery time. Moreover, since one set of molds is required for each type of product, it was not suitable for high-mix low-volume production. An object of the present invention is to provide a high-current circuit board that does not require a punching die for manufacturing, in view of the above problems of the prior art.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a flat portion on at least both ends of a rod-shaped conductor formed into a desired circuit pattern so that the lower surface is at the same level as the lower surface of the rod-shaped conductor. A large current circuit conductor is formed by forming a cylindrical portion projecting to the lower surface side, and the large current circuit conductor is fixed to the insulating substrate by inserting the cylindrical portion into the hole of the insulating substrate. It is a thing. The flat portion can be formed by crushing the rod-shaped conductor and the like, and the cylindrical portion can be formed by burring as in the conventional case. The cylindrical part may be used as a screw tap by forming a screw on the inner surface.

[0005]

[Action]

 This high-current circuit board uses not a copper plate but a rod-shaped conductor obtained by cutting a copper wire, a copper rod, etc., into a required length as a circuit conductor for high-current, so that a desired circuit can be formed by bending without using a mold. It is possible to obtain a circuit conductor for a large current of the pattern. Further, the flat portions provided at both ends of the rod-shaped conductor (and also in the intermediate portion if necessary) are formed so that the lower surface thereof is at the same level as the lower surface of the rod-shaped conductor molded into a desired circuit pattern. It sits well when set on an insulating substrate, and can be handled in the same way as conventional copper plate high-current circuit conductors, and can be fixed to an insulating substrate in the same manner as before. Incidentally, it is the same as the conventional method that the cylindrical portion is projected on the lower surface side of the flat portion and is inserted into the hole of the insulating substrate.

[0006]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 3 show an embodiment of the present invention. In the figure, 1 is a large-current circuit conductor, and 2 is an insulating substrate.

The large-current circuit conductor 1 is composed of a rod-shaped conductor 3 having a circular cross section. The rod-shaped conductor 3 is formed by bending into a desired circuit pattern, and the lower surface is equal to the lower surface of the rod-shaped conductor 3 at both ends thereof. The flat portion 4 is formed so as to be at the level, and the flat portion 4 is formed with the cylindrical portion 5 projecting to the lower surface side.

The rod-shaped conductor 3 can be obtained by cutting a copper wire, a copper rod, or the like into a required length, and since the cross-section is circular, it can be easily formed into a desired circuit pattern by bending. .. The flat portion 4 can be easily formed by flatly crushing the end portion of the rod-shaped conductor 3. Further, the cylindrical portion 5 can be formed by burring or the like as in the conventional case. If necessary, the surface of the large-current circuit conductor 1 is plated with solder alloy or tin.

The large-current circuit board of the present embodiment has the large-current circuit conductor 1 formed as described above, the cylindrical portion 5 of which is inserted into the hole 6 of the insulating substrate 2 by an adhesive or soldering. It is constructed by being fixed to the insulating substrate 1.

4 and 5 each show another embodiment of the present invention. FIG. 4 shows a large-current circuit conductor 1 using a bar-shaped conductor 3 having a flat bottom surface and a substantially circular cross-section. FIG. 5 uses a large-current circuit conductor 1 having a substantially square-shaped bar-shaped conductor 3. It was done. The rest of the configuration is the same as that of the above-described embodiment, so the same parts as in FIG.

[0011]

[Effect of the device]

 As described above, according to the present invention, since the rod-shaped conductor is used for the large-current circuit conductor, it is not necessary to use an expensive punching die for manufacturing the large-current circuit conductor, and the large-current circuit board is eliminated. The manufacturing cost can be significantly reduced and the delivery time can be shortened. Also, since the flat parts provided on at least both ends of the rod-shaped conductor are formed so that the lower surface thereof is at the same level as the lower surface of the rod-shaped conductor, it sits well when set on the insulating substrate, and the assembly work is easy. It's easy. Furthermore, it is possible to easily handle high-mix low-volume production.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a large current circuit board according to an embodiment of the present invention.

FIG. 2 is a plan view of the large current circuit board of FIG.

FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 4 is a cross-sectional view of a large current circuit board according to another embodiment of the present invention.

FIG. 5 is a cross-sectional view of a large current circuit board according to another embodiment of the present invention.

[Explanation of symbols]

 1: Circuit conductor for large current 2: Insulating substrate 3: Rod-shaped conductor 4: Flat part 5: Cylindrical part 6: Hole

Claims (1)

[Scope of utility model registration request] 1. A flat portion is provided at least at both ends of a rod-shaped conductor formed into a desired circuit pattern so that the lower surface is at the same level as the lower surface of the rod-shaped conductor, and the flat portion projects toward the lower surface. A large-current circuit board, wherein a cylindrical portion is formed as a large-current circuit conductor, and the large-current circuit conductor is fixed to the insulating substrate by inserting the cylindrical portion into a hole of the insulating substrate.