GERD GUENTHER / SCIENCE PHOTO LIBRARY GERD GUENTHER / SCIENCE PHOTO LIBRARY
Light micrograph of a section through a computer printed circuit board (PCB) with surface mounted ceramic capacitors. A small part of a PCB was embedded in light curing resin and then ground and diamond polished. The image shows the basic epoxy material of the PCB with glass reinforcement filaments in linen weave in blue color with three copper layers of the multilayer. Three ceramic capacitors in cross section are visible on the upper side of the PCB, showing the interior composition of the capacitors with several thin metal plates separated by ceramic material. Microscopic contrast technique: Incident brightfield combined with UV excitation fluorescence. Magnification: 30x when printed 10 centimetres wide.
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