Flexible circuit board
View Patent ↗A process of forming a flexible circuit board for ink jetting is provided. The process includes the steps of: providing an insulation tape; forming conductive traces on the insulation tape; and forming a photo-polymer layer filling between the conductive traces, wherein parts of the conductive traces are exposed to form a plurality of contacts. The material of the insulation tape can be polyimide, Teflon, polyamide, polymethylmethacrylate, polycarbonate, polyester, polyamide polyethylene-terephthalate copolymer, or any combination of the above materials. The material of the photo-polymer layer can be solder mask or polyimide.
1. A flexible circuit board for ink jetting, comprising:
an insulation tape as a substrate;
conductive traces on the insulation tape; and
a photo-polymer layer filling between the conductive traces, wherein parts of the conductive traces are exposed to form a plurality of contacts.
2. The flexible circuit board according to claim 1 , wherein the insulation tape comprises a polymer film.
3. The flexible circuit board according to claim 2 , wherein the material of the polymer film comprising at least one of polyimide (PI), Teflon, polyamide, polymethyl methacrylate, polycarbonate, polyester, and polyamide polyethylene-terephthalate copolymer.
4. The flexible circuit board according to claim 1 , wherein the material of the photo-polymer layer is solder mask.
5. The flexible circuit board according to claim 1 , wherein the photo-polymer layer is made of solder mask and the solder mask comprises a main agent and a hardener with a ratio of about 7:3.
6. The flexible circuit board according to claim 1 , wherein a material of the photo-polymer layer is polyimide.
7. The flexible circuit board according to claim 1 , wherein a material of the conductive traces is copper.
8. The flexible circuit board according to claim 1 , wherein a material of the conductive traces is gold.
9. The flexible circuit board according to claim 1 , wherein a thickness of the conductive traces is about 10 μm to 50 μm.