Rotational Circuit Board Etcher
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09
An arrangement is described which allows consistency in etching from front side to back on circuit boards. Circuit board etchers used today process the product horizontally, etching the top and bottom at the same time. The bottom is sprayed with etchant, which is drained away quickly because of gravity. The etchant that is sprayed on the top has no place to drain and accumulates in puddles. This "puddling" effect allows excess etching to take place, yielding smaller feature sizes than the bottom side. The rotational etcher, shown in Fig. 1, will integrate the etching effects across both sides throughout the process. This will result in less scrape, better quality, and enhanced process control. The etcher consists of cylindrical chamber 10 with spray nozzles 11.