GROUND PLANE PRINTED CIRCUIT BOARDS BY REFRACTED PHOTOGRAPHIC METHOD

摘要

Ground plane printed circuit boards with insulated barriers etched around the conductors have been made from a simple line diagram of the conductor pattern by using refracted light to obtain a sharp image of the outline of the conductors. The line width is controlled by selection and manipulation of the light refractor. The refracted photographic method results in a considerable saving of drafting time in the preparation of the master for the ground plane printed circuit board.