Method to Etch Panels With Plated Through Holes by Using Ink Jet Nozzles
Original Publication Date: 1985-Dec-01
Included in the Prior Art Database: 2005-Feb-19
An arrangement is disclosed which is capable of using ink jet technology to etch panels with plated through holes (PTHs). Fig. 1 illustrates a cross-section of a panel 8 having PTHs 9 where a first fluid is sprayed on areas 10 to be etched. Panel 8 is then dipped or sprayed with a second fluid which clings to all areas 11 except those covered with the first fluid, as shown in Fig. 2. The first fluid is then removed with either a bath or spray, and the panel is etched normally, as shown in Fig. 3. Finally, the second fluid is removed, as shown in Fig.4, where the etched areas 14 are indicated. Several classes of fluids would be appropriate. These include a hydrophilic fluid for the first fluid and a hydrophobic solution for the second fluid. Organic and aqueous solutions, if chosen carefully, would also be adequate.