Stretchable substrate, and method for manufacturing stretchable substrate

A method of manufacturing a stretchable substrate, the method comprising:

• a step of manufacturing a flexible substrate (a flexible printed circuit board, FPCB) to form one or more mounting pad parts configured to cause electronic parts to be mounted to a polyimide (PI) film having a fixed size, and a circuit pattern configured to circuit-connect the mounting pad parts, wherein the wiring pattern has a shape which shows that both end portion forms a shape like a letter of the alphabet Z on the whole in between a first mounting pad part and a second mounting pad part, and each of both the end portions in the shape of the letter of the alphabet Z is bent and extends two times in different directions from each other in a streamline form, thereby being connected to each of the first mounting pad part and the second mounting pad part;
• a step of mounting parts to mount the electronic parts assigned to the circuit pattern of the flexible substrate;
• and
• a punching step of carrying out work for cutting out the remaining section expect the mounting pad parts and the wiring pattern in a hollow part by cutting the flexible substrate to which the parts are mounted using a punching jig,
• wherein the wiring pattern is configured in a shape of comprising:
• a first curve portion which is curved at a fixed curvature radius by being connected to extend in a fixed length from a first connection point of any one mounting pad part;
• a second curve portion which is curved in the opposite direction by being formed rotationally, symmetrically with respect to the first curve portion;
• a first connection portion which extends to have a fixed length horizontally from the second curve portion;
• a third curve portion which is curved inward at a fixed curvature radius from an end of the first connection portion;
• a second connection portion which extends to have a fixed length in a diagonal direction with respect to a Z-like shape from the third curve portion;
• a fourth curve portion which is curved to be formed symmetrically with respect to the third curve portion from an end of the second connection portion;
• a third connection portion which extends to have a fixed length horizontally to be symmetrical with respect to the first connection portion from the fourth curve portion;
• a fifth curve portion which is curved at a fixed curvature radius to be symmetrical with respect to the second curve portion from an end of the third connection portion;
• and
• a sixth curve portion which is curved by being formed rotationally, symmetrically with respect to the fifth curve portion, thereby finishing by being connected to a second connection point of another mounting pad part by extending to have a fixed length from the six curve portion,
• wherein the first curve portion and the second curve portion, and the fifth curve portion and the sixth curve portion are curved in a shape resulting from being bent two times in different directions from each other in a streamline form, and the first connection portion, the second connection portion, and the third connection portion are realized in a shape like Z which is bent at a fixed curvature radius.

A method of manufacturing a stretchable substrate, the method comprising:

• a step of manufacturing a flexible substrate (a flexible printed circuit substrate, FPCB), wherein a circuit pattern composed of one or more mounting pad parts configured to cause electronic parts to be mounted to a polyimide film PI having a fixed size, and a wiring pattern configured to circuit-connect the mounting pad parts is formed, and an outer circumferential line of the circuit pattern is realized in a cutting line for cutting;
• a punching step of cutting out the remaining section except the mounting pad parts and the wiring pattern in a hollow part by cutting the cutting line of the circuit pattern using a punching jig having the blade set to be suitable for the cutting line of the flexible substrate manufactured;
• and
• a step of mounting parts to mount the parts assigned to the mounting pad parts of the flexible substrate cut, thereby completing the stretchable substrate,
• wherein the wiring pattern is configured in a shape of comprising:
• a first curve portion which is curved at a fixed curvature radius by being connected to extend in a fixed length from a first connection point of any one mounting pad part;
• a second curve portion which is curved in the opposite direction by being formed rotationally, symmetrically with respect to the first curve portion;
• a first connection portion which extends to have a fixed length horizontally from the second curve portion;
• a third curve portion which is curved inward at a fixed curvature radius from an end of the first connection portion;
• a second connection portion which extends to have a fixed length in a diagonal direction with respect to a Z-like shape from the third curve portion;
• a fourth curve portion which is curved to be formed symmetrically with respect to the third curve portion from an end of the second connection portion;
• a third connection portion which extends to have a fixed length horizontally to be symmetrical with respect to the first connection portion from the fourth curve portion;
• a fifth curve portion which is curved at a fixed curvature radius to be symmetrical with respect to the second curve portion from an end of the third connection portion;
• and
• a sixth curve portion which is curved by being formed rotationally, symmetrically with respect to the fifth curve portion, thereby finishing by being connected to a second connection point of another mounting pad part by extending to have a fixed length from the six curve portion,
• wherein the first curve portion and the second curve portion, and the fifth curve portion and the sixth curve portion are curved in a shape resulting from being bent two times in different directions from each other in a streamline form, and the first connection portion, the second connection portion, and the third connection portion are realized in a shape like a letter of the alphabet Z which is bent at a fixed curvature radius.