| 摘要 |
Insulated hookup wire is processed to provide point-to-point interconnections on a circuit board, including helical terminals formed integrally from stripped portions of the hookup wire and set into circuit board holes; the helical terminals serve as receptacles for contact pins of components such as DIP ICs, leads of components such as resistors or capacitors, or even for stripped ends of additional hookup wire, for example in interboard wiring. Regular dip or wave soldering may be performed subsequently. For special purposes, the wiring system of this invention may be utilized throughout a circuit board, or else it may be utilized strategically to supplement regular printed circuitry. In a three piece machine tool set, a shaped mandrel rotates to wind a portion of stripped wire into a dual interleaved helix and then press the helix into place as a helical terminal/receptacle in a circuit board hole, with one or two insulated hookup wires integrally attached for interconnection. A dual wire handling mechanism implements the installation of twisted pair runs which may include pairs of terminals at intermediate locations as well as at each end of a run. Such twisted pairs utilized as balanced transmission lines outperform unshielded printed circuit parallel microstrip lines in suppressing crosstalk and r.f. interference, and may enable transmission of critical digital and high frequency signals between widely separated regions of a circuit board while avoiding the cost, complexity, producibility and reliability penalties involved in the classic alternatives of adding several layers in a multilayer circuit board to provide buried stripline transmission paths or handwiring flexible or rigid coaxial cable runs with associated interfacing difficulties.
|
