... good absorption wavelength for a large number of dielectric materials such as FR-4, RCF, polyimides, PTFE, and aramids. This technology, however, requires capacity in | PRINTED WIRING BOARDS SUPPLIERS | wet chemistry and thermal oxidation for copper preparation. | THE PERFORMANCE CHARACTERISTICS | of RF-excited CO2 lasers enable them to create microvias at high speed. | PRINTED WIRING BOARDS SUPPLIERS | In most dielectrics, for example, microvias can be formed sequentially at speeds of up to 450 microvias/sec. CO2 lasers are used for resin-direct drilling (a | PRINTED WIRING BOARDS SUPPLIERS | common use in Japan) or for conformal mask drilling (common in Europe and the rest of Asia). The drilling process is progressive and usually takes | PRINTED WIRING BOARDS SUPPLIERS | three pulses or shots to form the microvia (Figure 6). | FOR MICROVIA FORMATION |. The vast majority of UV DPSS lasers operate at the | PRINTED WIRING BOARDS SUPPLIERS | frequency- tripled wavelength of 355 nm for microvia formation. Most materials become more absorptive at the laser wavelength of 355 nm, including copper and glass. | PRINTED WIRING BOARDS SUPPLIERS | Conse- quently, UV DPSS lasers can directly form ...
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... | | INFRARED (IR) | Part of the electromagnetic spectrum between the visible light range and the radar range. | INFRARED FUSING | The | PRINTED WIRING BOARDS SUPPLIERS | melting of tin / lead plating on PCB's using the energy given off by infrared waves | INSULATION RESISTANCE | The electrical resistance of the | PRINTED WIRING BOARDS SUPPLIERS | insulating material between any pair of contacts, conductors, or grounding devices in various combinations. | INSULATION METAL SUBSTRATES (IMS) |  Insulated metal substrates (IMS), thermal | PRINTED WIRING BOARDS SUPPLIERS | substrates, SMI or Alep Twin - there are many names for special PCB´s that were developed for one main purpose: to draw the undesired heat | PRINTED WIRING BOARDS SUPPLIERS | from electric components off the circuit board at a reasonable cost and, if possible, saving space. | INTERFACIAL CONNECTION | A conductor which connects conductive | PRINTED WIRING BOARDS SUPPLIERS | patterns on opposite sided of a PCB or other base. | INTERNAL LAYER (INNERLAYER) | A conductive pattern contained entirely within a multilayer PCB | | PRINTED WIRING BOARDS SUPPLIERS | IMIDAZOL |Chemical compound of the formula C5 N2 HR3., application as agent ...
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... | | HOLE BREAKOUT | A condition in which a hole is not completely surrounded by the land. | HOLE DENSITY | The quantity | PRINTED WIRING BOARDS SUPPLIERS | of holes in a printed board per unit area. | HOLE LOCATION | - The dimensional location of the center of a hole. | HOLE | PRINTED WIRING BOARDS SUPPLIERS | PATTERN | The arrangement of all holes in a printed board. | HOLE PREPARATION | The hole prior to plating shall be clean cut and | PRINTED WIRING BOARDS SUPPLIERS | free of burrs, loose or hanging fibers, copper dust and resin dust. | HOLE PULL STRENGTH | The force (in pounds) necessary to rupture a | PRINTED WIRING BOARDS SUPPLIERS | plated-through hole when loaded or pulled in the direction of the axis of the hole. | HOLE |Void A void in the metallic deposit of | PRINTED WIRING BOARDS SUPPLIERS | a plated-through ...
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