By combining a laser cutter and kirigami know-how, we were able to create an expandable circuit board. This expanding circuit board maintains a constant resistance even when stretched and allows for soldering. (currently under development)
From the video
“We would like to show you an expandable yet robust flexible PCB that makes use of a milkyway-like origami structure.
Conventional fleble PCBs aren’t expandable.
However, it may be easier to see if you can picture the links between the stars in the milkyway but,
by adding slits, the structure becomes expandable like so.
These flexible PCB are strengthened throughout with a 0.3mm backboard.
We are able to make a flexible PCB that is both thick and robust while flexible and expandable.”
The particularity of the materials used in flexible PCB is that, while not expandable, it can be bent.
Comparing it to an origami pattern, the red area buckles from the plane and becomes a curved surface in order to allow the entire sheet to stretch in appearance.
As with standard flexible PCB, this stretchable PCB maintains a constant resistance value through its expansion range and allows for soldering.In addition to this, by elongating this red area, even sheets made of thick or hard materials can be easily bent or stretched.
Although the materials of the flexible PCB aren’t expandable, we have succeeded in realizing a stretchable PCB by combining laser cutters and papercutting (kirie) techniques.