JPS6317170Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a connection structure for electrically connecting a plurality of curved conductors.

Soldering is generally used as a conventional connection structure of this type.

However, as shown in FIG. 1, finely machined rod-shaped piezoelectric electrodes 1 are adhesively fixed with epoxy adhesive 3 at predetermined intervals along the outer periphery of a cylindrical sound absorber 2 made of an insulating material. In the case where a flexible printed wiring board 5 having a thin conductor pattern 4 formed thereon is arranged around it for electrical connection,
It is very difficult to connect the piezoelectric electrode 1 and the conductor pattern 4 individually by soldering 6. For example, piezoelectric electrodes have weak adhesion with solder, so if external stress is applied to the soldered part, they may peel off and cause poor conductivity. There are drawbacks such as the installation time and the like must be taken into account, and a large amount of assembly man-hours are required.

The present invention solves the above-mentioned drawbacks by interposing a conductive flexible resin sheet between the piezoelectric electrode and the conductor pattern, and applying pressure with a ring having spring properties to connect the piezoelectric electrode and the conductor pattern. The object of the present invention is to obtain a connection structure for curved conductors that is easy to work with, can reduce assembly man-hours, and can provide highly reliable connections by press-welding the conductors with patterns.

An embodiment of the present invention will be explained with reference to FIG. 2. 1 is a finely machined rod-shaped piezoelectric electrode (for example, one coated with a conductive agent on both sides), 2 is a cylindrical sound absorber, and 3 is a cylindrical sound absorber. An epoxy adhesive, 5 a flexible printed wiring board on which a thin line conductor pattern 4 is formed, and 7 a conductive flexible resin sheet having rubber elasticity. Further, 8 is a tightening ring, and the tightening ring 8, as shown in FIG. 3, has cut portions 9 at arbitrary locations, and is provided with grooves 10 over the entire length of its outer circumference. The tightening ring 8 is made of a metal such as beryllium copper and has been heat treated to improve its springiness. 11 is a wire such as an annealed copper wire, and 12 is an elastic plate such as a stainless steel plate.

Next, let's talk about the assembly of the above components.
A flexible resin sheet 7 is wrapped around the outer periphery of the piezoelectric electrode 1 which is adhesively fixed at a predetermined interval along the outer periphery of the sound absorber 2 with an adhesive 3, and a flexible printed wiring board 5 is wrapped around it from the outside. After fastening, a tightening ring 8 is fitted onto the outer periphery of the flexible printed wiring board 5 and pressure is applied, thereby bringing the piezoelectric electrode 1 and the conductor pattern 4 into pressure contact via the flexible resin sheet 7, thereby electrically Make conductive. Also, at this time, an elastic plate 12 is inserted between the cut portion 9 of the tightening ring 8 and the flexible printed wiring board 5 so that the pressing force is uniformly applied to the entire circumference of the flexible printed wiring board 5. , the wire rod 1 is placed in the groove 10 of the tightening ring 8.
1, and by twisting and fastening both ends of the wire 11, even if stress relaxation of the spring pressure occurs due to fatigue of the tightening ring 8, poor continuity etc. can be prevented. At the same time, the connection state can be maintained reliably.

In addition, although the above embodiment describes the case where a rod-shaped piezoelectric electrode conductor pattern is connected,
It can also be applied to cases where a piezoelectric electrode formed in a ring shape and a conductor pattern are connected.

In addition to the metal ring, a high hardness rubber ring can also be used as the tightening ring to obtain a good pressure welding effect.

The connection structure of the present invention with the above configuration is -54℃
The results showed that no conduction failure occurred even under temperature cycling at ~70°C, and a reliable and reliable connection could be made.

As explained above, the present invention interposes a conductive flexible resin sheet between piezoelectric electrodes arranged or formed in a curved shape and a conductive pattern, and presses the conductive sheet from the outside with a tightening ring. Since the structure is such that the piezoelectric electrode and the conductor pattern are pressed into contact with each other, even if external stress is applied, there will be no conduction failure, and a reliable and reliable electrical connection can be made. Since a wire rod is wrapped around the outer circumference of the ring and fastened, even if stress relaxation of the spring pressure occurs due to fatigue of the tightening ring, poor conduction can be prevented.

In addition, since multiple piezoelectric electrodes and conductor patterns can be connected and fixed at once, assembly work becomes easier and the number of assembly steps can be significantly reduced.Moreover, since connections are not made by soldering, soldering is not required. There is no need to worry about the soldering amount, soldering temperature, soldering time, etc., and damage to piezoelectric electrodes and conductor patterns during assembly can be avoided.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a conventional example, FIG. 2 is a front view showing an embodiment of the present invention, and FIG. 3 is a perspective view showing the shape of a tightening ring. 1...piezoelectric electrode, 4...conductor pattern, 5...
... Flexible printed wiring board, 7 ... Flexible resin sheet, 8 ... Tightening ring, 9 ... Cutting section, 10 ...
...Groove, 11...Wire rod, 12...Elastic plate.

Claims (1)

[Claims for Utility Model Registration] 1. Electrically connecting a conductor such as rod-shaped or ring-shaped piezoelectric electrodes arranged in a curved shape such as a cylinder to a conductor pattern formed on a flexible printed wiring board. In the structure, a conductive flexible resin sheet is wrapped around the outer periphery of the conductors arranged in the shape of a curved body, a flexible printed wiring board is wrapped around the outside of the sheet with the conductor pattern inside, and the outer periphery is further cut. By fitting a tightening ring having a spring property with a section, inserting an elastic plate between the cut section and the flexible printed wiring board, and wrapping and fastening a wire around the outer periphery of the tightening ring. 1. An electrical connection structure for curved conductors, characterized in that the conductors arranged in a curved shape and a conductor pattern on a flexible printed wiring board are electrically connected to each other by pressure contact via a flexible resin sheet. 2 Utility model registration claim No. 1 characterized in that a groove into which a wire is fitted is provided on the outer periphery of the tightening ring.
Electrical connection structure of the curved solid conductor described in . 3 Utility model registration claim 1 characterized in that a metal ring is used as the tightening ring
Electrical connection structure of the curved solid conductor described in . 4. The electrical connection structure for a curved conductor as claimed in claim 1 of the utility model registration, characterized in that a high hardness rubber ring is used as the tightening ring.