JPS5821198Y2 - printed wiring - Google Patents

Description

[Detailed description of the invention] This invention relates to printed wiring, in which conductor patterns are formed on both sides of a very thin insulating sheet, and the conductor patterns are connected to each other through the insulating sheet, and in particular, to a connection structure of conductor patterns on both sides. .

In conventional printed wiring, wiring formed on both sides of the printed wiring is connected as shown in FIG.

That is, wiring conductors 12 and 13 were formed on both sides of an insulating substrate 11, a through hole 14 was formed in the insulating substrate 11 at the connection part thereof, and a pretreatment such as application of a catalyst was performed on the inner peripheral surface of the through hole 14. After that, plated layer 15 is formed by electroless plating.
After that, an electroplated layer 16 was formed by electrolytic plating, and the pattern conductors 12 and 13 on both sides were connected to each other by the electroless plated layer 15 and the electroplated layer 16.

This is what is called a through fall.

Such a technique involves a large number of steps and is troublesome.

As an insulating substrate for printed wiring, it has been proposed to use an insulating sheet having a thickness of several to several 10 microns, for example.

Such printed wiring can be used not only for configuring wiring for so-called electrical circuits, but also for coils of small motors, for example.

In printed wiring using such an insulating sheet as a substrate, constructing through-falls at the connection portions using a method similar to the conventional method not only complicates the process but also makes handling difficult.

Therefore, it is desirable to easily and reliably connect pattern conductors on both sides to each other by utilizing the thinness of the insulating substrate.

This idea forms connection patterns that are opposite to each other on both sides of the patterned conductors formed on the insulating sheet, that is, connection patterns that have a negative and positive relationship, and the connection pattern cuts the insulating sheet. They are buried in each other so that they are on the same surface, and are connected to each other in that state.

For example, as shown in Figure 2, the thickness is from several microns to several tens of microns.
Patterned conductors 18 and 19 are formed on both surfaces of the micron-thin insulating sheet 17, and although not shown, these patterned conductors are spiral coils or electrical circuit wiring conductors.

Connection portions 21 and 22 are formed on the insulating sheet 17 by being connected to the pattern conductors 18 and 19, respectively.

As shown in FIGS. 2 and 3, the connecting portion 21 is formed of, for example, a plurality of linear conductors arranged in parallel at equal intervals, and has an approximately circular shape as a whole.On the other hand, the connecting portion 22 A conductor is located between the 21 conductors, and the overall shape is similarly circular.

In other words, the connection pattern formed by the conductor of the connection part 21 and the conductor pattern of the connection part 22 are complementary to each other, that is, have a negative and positive relationship.

Such connecting portions 21 and 22 are formed by cutting the insulating sheets 17 at these portions and filling them with each other so that they are substantially on the same plane.

That is, for example, as shown in FIG. 4, the connecting portions 21 and 22 of the insulating sheet 17 are placed on the pedestal 23, and the pressure pin 24 is pressed from above the connecting portion 21.22 toward the pedestal 23 to connect the insulating sheet 17 as shown in the figure. The connection pattern of section 21 is inserted into the connection pattern of connection section 22 by cutting the insulating sheet.

This pushed-in state is as shown in an enlarged view in FIG.

Thereafter, as shown in FIG.
are connected to each other by

Alternatively, connect them to each other with conductive adhesive.

When the connection patterns of the connecting portions 21 and 22 are mutually offset as shown in FIG. 5, the sides of the connecting portions 21 and 22 are in contact with each other without any gap between them, or they are mutually connected as shown in FIG. A connection pattern in which a portion overlaps with 21.
22, and in this state, these connecting portions 21 and 22 are offset as shown in FIG. 8, and the connecting portions 21 and 22 are connected to each other electrically or by thermocompression bonding, or by electric welding.

In this welding, for example, when pressing the pressure pin 24 in FIG. 4, the connection parts 21 and 22 can be connected at once by applying current to the pressure pin 24 and the pedestal 23 as electrodes and welding them.

As shown in FIG. 5, when the connecting portions 21 and 22 are mutually offset and there is some distance 11 between them, 11 becomes a small value with respect to the thickness Dl of the conductor at the connecting portion. Even if the patterns of the connecting portions 21 and 22 are partially overlapped, the overlapping cutout 12 should be smaller than the thickness Dl of the conductor at the connecting portion, as shown in FIG. It is preferable to do so.

The pattern of the connection part can be of various shapes as shown in FIG. 9, and in any case, for example, in the pattern of the connection part 21, the conductor of the connection part 22 is present in the part 28 where no conductor exists. , the conductor of the connection part 22 is not present in the conductor part of the connection part 21.

FIG. 10 is a plan view showing spiral coils 31 formed facing each other on both sides of the insulating sheet 17, with the inner and outer ends of the coils serving as connecting portions 21, respectively, and the connecting portions 21 forming the insulating sheet 17. It is connected to the connecting portion 22 on the back side of the connector as described above.

The sheet-like coil shown in FIG. 10 can be used as a coil for a small motor by winding the coils in an overlapping manner.

In FIG. 10, the groove between adjacent coil conductors is shown by one solid line.

As described above, according to the printed wiring according to this invention, connection of pattern conductors formed on both sides of the insulating sheet can be easily and reliably connected without using electroplating.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing the through-hole of conventional printed wiring.
Figure 2 is a diagram showing a part of the process of manufacturing printed wiring according to this invention, Figure 3 is a plan view of the connection part, and Figure 4 is a cross section showing a part of the process of manufacturing printed wiring according to this invention. Figure, 5th
The figure is an enlarged view of the connection parts on both sides of this printed wiring that are on almost the same plane, Figure 6 is a diagram showing an example in which a conductor layer is formed on the connection part, and Figure 7 is an enlarged view of the other connection parts. Illustration showing an example, No. 8
9 is a diagram showing the connection state, FIG. 9 is a diagram showing another pattern of the connection part, and FIG. 10 is a plan view showing a motor coil to which this invention is applied. 17: Insulating sheet, 18, 19: Pattern conductor, 21.
22: Connection portion, 25: Connection conductor layer.

Claims (1)

[Scope of utility model registration request] Patterned conductors are formed on both sides of the insulating sheet, and connection parts connecting these patterned conductors to each other are formed on the other side of the insulating sheet in a complementary relationship with a first connection pattern formed on one side of the insulating sheet. The formed second connection pattern and the first connection pattern are cut and filled with each other so that they are almost on the same plane. The second connection pattern is printed wiring that is electrically connected to each other.