What does it require to make your very own incorporated circuits in the house? It’s an inquiry that fairly couple of brave cyberpunks have actually attempted to address, and also the solution is generally something along the lines of “a great deal of used devices.” However it does not all need to be cast-offs from a semiconductor fab, as [Zachary Tong] reveals us with his homebrew direct laser lithography setup.
A lot of us recognize with covered up photolithography many thanks to the old-time procedure of making PCBs utilizing photoresist– a copper-clad board is treated with a photopolymer, a mask including the traces to be engraved is used, and also the board is revealed to UV light, which uniquely sets the stand up to layer prior to engraving. [Zach] checks out a variant on that particular motif– maskless photolithography– along with scaling it down substantially with this gear. An optical bench concentrates and also routes a UV laser right into a galvanometer that was restored from an old printer. The galvo manages the placement of the parallelled laser beam of light really specifically prior to concentrating it on a microscopic lense that substantially tightens its area. The laser dancings over the surface area of a silicon wafer covered with photoresist, where it engraves away the stand up to, making the silicon prepared for engraving and also more handling.
Being made as it is from restored elements, light weight aluminum extrusion, and also 3D-printed components, [Zach]’s arrangement is much from ideal. However he had the ability to obtain some rather remarkable outcomes, with attributes to 7 microns. There’s a lot of area for optimization, certainly, consisting of much better galvanometers and also a much less impromptu optical arrangement, however we’re eager to see where this goes. [Zach] states among his objectives is homebrew microelectromechanical systems (MEMS), so we’re eagerly anticipating that.