| 摘要 |
<p>The present invention relates to a method to manufacture an adjustable resistance carbon printed circuit board. The method to manufacture an adjustable resistance carbon printed circuit board generates an adjustable resistance by embedding a carbon resistor in a printed circuit in order to be applied to a high precision actuator printed circuit board by reducing a resistance value and the error of straightness and improving durability. The present invention includes: a step of forming a copper film circuit on a substrate; a step of exposing a part of the copper film circuit by spreading photo-resist on the substrate on which the copper film circuit is formed and forming a pair of PSR layer open parts for defining the length and width of a carbon resistance; a step in which an emulsion open part puts pattern-formed emulsion on the substrate on which the PSR layer open part is formed and prints carbon ink; and a step of thermosetting a printed carbon. The resistance value of the carbon resistance is determined by a length between the vertical length W of the PSR layer open part and a vertical cross section adjacent to the PSR layer open part by keeping a relationship of W < W′between the vertical length W of the PSR layer open part and the vertical length W′of the emulsion open part. The carbon ink which forms the carbon resistance increases the resistance value by mixing the resin component of a particle with carbon.</p> |
