Method for manufacturing tape wiring board
View Patent ↗A method for manufacturing a tape wiring board in accordance with the present invention may employ an imprinting process in forming a wiring pattern, thereby reducing the number of processes for manufacturing a tape wiring board and allowing the manufacturing process to proceed in a single production line. Therefore, the manufacturing time and cost may be reduced. A profile of the wiring pattern may be determined by the shape of an impression pattern of a mold. This may establish the top width of inner and outer leads and incorporate fine pad pitch. Although ILB and OLB process may use an NCP, connection reliability may be established due to the soft and elastic wiring pattern.
1. A method for manufacturing a tape wiring board, the method comprising:
forming a conductive polymer layer on a base film;
forming a protection layer on the conductive polymer layer;
after forming the protection layer, imprinting the conductive polymer layer by a mold to form a wiring pattern; and
forming a solder resist layer to cover the wiring pattern.
2. The method of claim 1 , further comprising removing residue before covering the wiring pattern.
3. The method of claim 2 , wherein removing residue includes removing a concave portion of the conductive polymer layer by a dry etching method.
4. The method of claim 1 , further comprising exposing a portion of the wiring pattern to be connected with inner and outer terminals.
5. The method of claim 1 , wherein the base film includes a thermosetting polyimide tape.
6. The method of claim 1 , wherein the conductive polymer layer includes a mixture of a thermoplastic polymer and conductive particles.
7. The method of claim 6 , wherein the conductive particle is selected from the group consisting of a nanosilver, a carbon nanotube, a carbon nanofiber and combinations thereof.
8. The method of claim 1 , wherein forming the conductive polymer layer includes:
forming a conductive polymer to a greater thickness than the depth of an impression pattern of the mold.
9. The method of claim 1 , wherein imprinting a conductive polymer layer includes:
heating the conductive polymer layer at a temperature higher than the melting point of the conductive polymer and lower than the glass transition temperature (Tg) of the base film; and
impressing the conductive polymer layer by the mold to imprint the impression pattern on the conductive polymer layer.
10. The method of claim 9 , wherein imprinting the conductive polymer layer includes cooling the mold continuously.
11. The method of claim 9 , wherein imprinting the conductive polymer layer includes impressing the conductive polymer layer by the mold close to one surface of the base film.
12. The method of claim 11 , wherein the wiring pattern includes a convex portion of the conductive polymer layer.
13. The method of claim 1 , further comprising: removing the protection layer before forming the solder resist layer.
14. The method of claim 1 , wherein forming the protection layer comprises spraying and curing at least one of silane and silicone polymer solution on the conductive polymer layer.
15. A method for manufacturing a tape wiring board, the method comprising:
forming a conductive polymer layer on a base film;
forming a protection layer on the conductive polymer layer;
imprinting the conductive polymer layer by a mold to form a wiring pattern; and
removing the protection layer;
after removing the protection layer, forming a solder resist layer on the conductive polymer layer to cover the wiring pattern.