... Automatic Optical Inspection (AOI). This inspection stage is to verify that all the design features are in accordance with customer requirements. The final stage | PCB PRODUCE | of inner layer manufacture is to punch tooling holes into the layers to achieve good layer-to-layer registration in the bonding process. Final QC-Inspection-Department + zoom | PCB PRODUCE | + Optical Tester - Opens and Shorts (narrow and wide) - Conductor and Spacing Width vialations - Nicks, Pinholes and Extraneous Metal - Missing, defective | PCB PRODUCE | or misregistered pads - Shorts and potential shorts in power and ground clearances. - Three conductor widths, minimum and maximum width violations - Annular ring | PCB PRODUCE | width violations with or without breakout allowed. - Missing or plugged holes - Average line width measurements for controlled impedance panels - Dimensional distortions - | PCB PRODUCE | Missing traces and ...
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... TERMS OF PRINTED CIRCUIT BOARDS | | INFRARED (IR) | Part of the electromagnetic spectrum between the visible light range and the radar range. | PCB PRODUCE | | INFRARED FUSING | The melting of tin / lead plating on PCB's using the energy given off by infrared waves | INSULATION RESISTANCE | | PCB PRODUCE | The electrical resistance of the insulating material between any pair of contacts, conductors, or grounding devices in various combinations. | INSULATION METAL SUBSTRATES (IMS) | | PCB PRODUCE |  Insulated metal substrates (IMS), thermal substrates, SMI or Alep Twin - there are many names for special PCB´s that were developed for one main purpose: | PCB PRODUCE | to draw the undesired heat from electric components off the circuit board at a reasonable cost and, if possible, saving space. | INTERFACIAL CONNECTION | | PCB PRODUCE | A conductor which connects conductive patterns on opposite sided of a PCB or other base. | INTERNAL LAYER (INNERLAYER) | A conductive pattern contained entirely | PCB PRODUCE | within a multilayer PCB | IMIDAZOL |Chemical compound of the formula ...
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... epoxy resin and spreading it across the hole wall during its up and down motion. The epoxy smear causes poor and in some cases | PCB PRODUCE | non electrical continuity to the innerlayers as well as poor adhesion of the plated copper to the hole wall. In desmear, the chemical attack is | PCB PRODUCE | designed to remove only the surface smear of resin from the hole wall, without attacking the wall structure itself. For most needs desmearing is sufficient | PCB PRODUCE | whilst for some military applications it is necessary to etchback 75mm for what is referred to as 3 point contact. Etchback is a stronger chemical | PCB PRODUCE | attack than desmearing. It is designed to remove not only the smeared resin, but also additional resin from the wall structure and the remaining protruding | PCB PRODUCE | glass fibres. There are various methods of desmearing and etchback available to multilayer manufacturers. Permanganate works on the principle of oxidising the epoxy smear. Advantages | PCB PRODUCE | are its predictability, its wide operating window and its ability to handle most ...
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